drivers/char/synclink_gt.c

   1 /*
   2  * $Id: synclink_gt.c,v 4.25 2006/02/06 21:20:33 paulkf Exp $
   3  *
   4  * Device driver for Microgate SyncLink GT serial adapters.
   5  *
   6  * written by Paul Fulghum for Microgate Corporation
   7  * paulkf@microgate.com
   8  *
   9  * Microgate and SyncLink are trademarks of Microgate Corporation
  10  *
  11  * This code is released under the GNU General Public License (GPL)
  12  *
  13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  14  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  16  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  17  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  21  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  23  * OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 /*
  27  * DEBUG OUTPUT DEFINITIONS
  28  *
  29  * uncomment lines below to enable specific types of debug output
  30  *
  31  * DBGINFO   information - most verbose output
  32  * DBGERR    serious errors
  33  * DBGBH     bottom half service routine debugging
  34  * DBGISR    interrupt service routine debugging
  35  * DBGDATA   output receive and transmit data
  36  * DBGTBUF   output transmit DMA buffers and registers
  37  * DBGRBUF   output receive DMA buffers and registers
  38  */
  39
  40 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
  41 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
  42 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
  43 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
  44 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
  45 //#define DBGTBUF(info) dump_tbufs(info)
  46 //#define DBGRBUF(info) dump_rbufs(info)
  47
  48
  49 #include <linux/config.h>
  50 #include <linux/module.h>
  51 #include <linux/version.h>
  52 #include <linux/errno.h>
  53 #include <linux/signal.h>
  54 #include <linux/sched.h>
  55 #include <linux/timer.h>
  56 #include <linux/interrupt.h>
  57 #include <linux/pci.h>
  58 #include <linux/tty.h>
  59 #include <linux/tty_flip.h>
  60 #include <linux/serial.h>
  61 #include <linux/major.h>
  62 #include <linux/string.h>
  63 #include <linux/fcntl.h>
  64 #include <linux/ptrace.h>
  65 #include <linux/ioport.h>
  66 #include <linux/mm.h>
  67 #include <linux/slab.h>
  68 #include <linux/netdevice.h>
  69 #include <linux/vmalloc.h>
  70 #include <linux/init.h>
  71 #include <linux/delay.h>
  72 #include <linux/ioctl.h>
  73 #include <linux/termios.h>
  74 #include <linux/bitops.h>
  75 #include <linux/workqueue.h>
  76 #include <linux/hdlc.h>
  77
  78 #include <asm/system.h>
  79 #include <asm/io.h>
  80 #include <asm/irq.h>
  81 #include <asm/dma.h>
  82 #include <asm/types.h>
  83 #include <asm/uaccess.h>
  84
  85 #include "linux/synclink.h"
  86
  87 #ifdef CONFIG_HDLC_MODULE
  88 #define CONFIG_HDLC 1
  89 #endif
  90
  91 /*
  92  * module identification
  93  */
  94 static char *driver_name     = "SyncLink GT";
  95 static char *driver_version  = "$Revision: 4.25 $";
  96 static char *tty_driver_name = "synclink_gt";
  97 static char *tty_dev_prefix  = "ttySLG";
  98 MODULE_LICENSE("GPL");
  99 #define MGSL_MAGIC 0x5401
 100 #define MAX_DEVICES 12
 101
 102 static struct pci_device_id pci_table[] = {
 103         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 104         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 105         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 106         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 107         {0,}, /* terminate list */
 108 };
 109 MODULE_DEVICE_TABLE(pci, pci_table);
 110
 111 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 112 static void remove_one(struct pci_dev *dev);
 113 static struct pci_driver pci_driver = {
 114         .name           = "synclink_gt",
 115         .id_table       = pci_table,
 116         .probe          = init_one,
 117         .remove         = __devexit_p(remove_one),
 118 };
 119
 120 static int pci_registered;
 121
 122 /*
 123  * module configuration and status
 124  */
 125 static struct slgt_info *slgt_device_list;
 126 static int slgt_device_count;
 127
 128 static int ttymajor;
 129 static int debug_level;
 130 static int maxframe[MAX_DEVICES];
 131 static int dosyncppp[MAX_DEVICES];
 132
 133 module_param(ttymajor, int, 0);
 134 module_param(debug_level, int, 0);
 135 module_param_array(maxframe, int, NULL, 0);
 136 module_param_array(dosyncppp, int, NULL, 0);
 137
 138 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
 139 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
 140 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
 141 MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
 142
 143 /*
 144  * tty support and callbacks
 145  */
 146 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 147
 148 static struct tty_driver *serial_driver;
 149
 150 static int  open(struct tty_struct *tty, struct file * filp);
 151 static void close(struct tty_struct *tty, struct file * filp);
 152 static void hangup(struct tty_struct *tty);
 153 static void set_termios(struct tty_struct *tty, struct termios *old_termios);
 154
 155 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 156 static void put_char(struct tty_struct *tty, unsigned char ch);
 157 static void send_xchar(struct tty_struct *tty, char ch);
 158 static void wait_until_sent(struct tty_struct *tty, int timeout);
 159 static int  write_room(struct tty_struct *tty);
 160 static void flush_chars(struct tty_struct *tty);
 161 static void flush_buffer(struct tty_struct *tty);
 162 static void tx_hold(struct tty_struct *tty);
 163 static void tx_release(struct tty_struct *tty);
 164
 165 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 166 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
 167 static int  chars_in_buffer(struct tty_struct *tty);
 168 static void throttle(struct tty_struct * tty);
 169 static void unthrottle(struct tty_struct * tty);
 170 static void set_break(struct tty_struct *tty, int break_state);
 171
 172 /*
 173  * generic HDLC support and callbacks
 174  */
 175 #ifdef CONFIG_HDLC
 176 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 177 static void hdlcdev_tx_done(struct slgt_info *info);
 178 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
 179 static int  hdlcdev_init(struct slgt_info *info);
 180 static void hdlcdev_exit(struct slgt_info *info);
 181 #endif
 182
 183
 184 /*
 185  * device specific structures, macros and functions
 186  */
 187
 188 #define SLGT_MAX_PORTS 4
 189 #define SLGT_REG_SIZE  256
 190
 191 /*
 192  * conditional wait facility
 193  */
 194 struct cond_wait {
 195         struct cond_wait *next;
 196         wait_queue_head_t q;
 197         wait_queue_t wait;
 198         unsigned int data;
 199 };
 200 static void init_cond_wait(struct cond_wait *w, unsigned int data);
 201 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
 202 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
 203 static void flush_cond_wait(struct cond_wait **head);
 204
 205 /*
 206  * DMA buffer descriptor and access macros
 207  */
 208 struct slgt_desc
 209 {
 210         unsigned short count;
 211         unsigned short status;
 212         unsigned int pbuf;  /* physical address of data buffer */
 213         unsigned int next;  /* physical address of next descriptor */
 214
 215         /* driver book keeping */
 216         char *buf;          /* virtual  address of data buffer */
 217         unsigned int pdesc; /* physical address of this descriptor */
 218         dma_addr_t buf_dma_addr;
 219 };
 220
 221 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
 222 #define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
 223 #define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
 224 #define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
 225 #define desc_count(a)      (le16_to_cpu((a).count))
 226 #define desc_status(a)     (le16_to_cpu((a).status))
 227 #define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
 228 #define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
 229 #define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
 230 #define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
 231 #define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
 232
 233 struct _input_signal_events {
 234         int ri_up;
 235         int ri_down;
 236         int dsr_up;
 237         int dsr_down;
 238         int dcd_up;
 239         int dcd_down;
 240         int cts_up;
 241         int cts_down;
 242 };
 243
 244 /*
 245  * device instance data structure
 246  */
 247 struct slgt_info {
 248         void *if_ptr;           /* General purpose pointer (used by SPPP) */
 249
 250         struct slgt_info *next_device;  /* device list link */
 251
 252         int magic;
 253         int flags;
 254
 255         char device_name[25];
 256         struct pci_dev *pdev;
 257
 258         int port_count;  /* count of ports on adapter */
 259         int adapter_num; /* adapter instance number */
 260         int port_num;    /* port instance number */
 261
 262         /* array of pointers to port contexts on this adapter */
 263         struct slgt_info *port_array[SLGT_MAX_PORTS];
 264
 265         int                     count;          /* count of opens */
 266         int                     line;           /* tty line instance number */
 267         unsigned short          close_delay;
 268         unsigned short          closing_wait;   /* time to wait before closing */
 269
 270         struct mgsl_icount      icount;
 271
 272         struct tty_struct       *tty;
 273         int                     timeout;
 274         int                     x_char;         /* xon/xoff character */
 275         int                     blocked_open;   /* # of blocked opens */
 276         unsigned int            read_status_mask;
 277         unsigned int            ignore_status_mask;
 278
 279         wait_queue_head_t       open_wait;
 280         wait_queue_head_t       close_wait;
 281
 282         wait_queue_head_t       status_event_wait_q;
 283         wait_queue_head_t       event_wait_q;
 284         struct timer_list       tx_timer;
 285         struct timer_list       rx_timer;
 286
 287         unsigned int            gpio_present;
 288         struct cond_wait        *gpio_wait_q;
 289
 290         spinlock_t lock;        /* spinlock for synchronizing with ISR */
 291
 292         struct work_struct task;
 293         u32 pending_bh;
 294         int bh_requested;
 295         int bh_running;
 296
 297         int isr_overflow;
 298         int irq_requested;      /* nonzero if IRQ requested */
 299         int irq_occurred;       /* for diagnostics use */
 300
 301         /* device configuration */
 302
 303         unsigned int bus_type;
 304         unsigned int irq_level;
 305         unsigned long irq_flags;
 306
 307         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
 308         u32 phys_reg_addr;
 309         int reg_addr_requested;
 310
 311         MGSL_PARAMS params;       /* communications parameters */
 312         u32 idle_mode;
 313         u32 max_frame_size;       /* as set by device config */
 314
 315         unsigned int raw_rx_size;
 316         unsigned int if_mode;
 317
 318         /* device status */
 319
 320         int rx_enabled;
 321         int rx_restart;
 322
 323         int tx_enabled;
 324         int tx_active;
 325
 326         unsigned char signals;    /* serial signal states */
 327         int init_error;  /* initialization error */
 328
 329         unsigned char *tx_buf;
 330         int tx_count;
 331
 332         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 333         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 334         BOOLEAN drop_rts_on_tx_done;
 335         struct  _input_signal_events    input_signal_events;
 336
 337         int dcd_chkcount;       /* check counts to prevent */
 338         int cts_chkcount;       /* too many IRQs if a signal */
 339         int dsr_chkcount;       /* is floating */
 340         int ri_chkcount;
 341
 342         char *bufs;             /* virtual address of DMA buffer lists */
 343         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
 344
 345         unsigned int rbuf_count;
 346         struct slgt_desc *rbufs;
 347         unsigned int rbuf_current;
 348         unsigned int rbuf_index;
 349
 350         unsigned int tbuf_count;
 351         struct slgt_desc *tbufs;
 352         unsigned int tbuf_current;
 353         unsigned int tbuf_start;
 354
 355         unsigned char *tmp_rbuf;
 356         unsigned int tmp_rbuf_count;
 357
 358         /* SPPP/Cisco HDLC device parts */
 359
 360         int netcount;
 361         int dosyncppp;
 362         spinlock_t netlock;
 363 #ifdef CONFIG_HDLC
 364         struct net_device *netdev;
 365 #endif
 366
 367 };
 368
 369 static MGSL_PARAMS default_params = {
 370         .mode            = MGSL_MODE_HDLC,
 371         .loopback        = 0,
 372         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
 373         .encoding        = HDLC_ENCODING_NRZI_SPACE,
 374         .clock_speed     = 0,
 375         .addr_filter     = 0xff,
 376         .crc_type        = HDLC_CRC_16_CCITT,
 377         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
 378         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
 379         .data_rate       = 9600,
 380         .data_bits       = 8,
 381         .stop_bits       = 1,
 382         .parity          = ASYNC_PARITY_NONE
 383 };
 384
 385
 386 #define BH_RECEIVE  1
 387 #define BH_TRANSMIT 2
 388 #define BH_STATUS   4
 389 #define IO_PIN_SHUTDOWN_LIMIT 100
 390
 391 #define DMABUFSIZE 256
 392 #define DESC_LIST_SIZE 4096
 393
 394 #define MASK_PARITY  BIT1
 395 #define MASK_FRAMING BIT2
 396 #define MASK_BREAK   BIT3
 397 #define MASK_OVERRUN BIT4
 398
 399 #define GSR   0x00 /* global status */
 400 #define JCR   0x04 /* JTAG control */
 401 #define IODR  0x08 /* GPIO direction */
 402 #define IOER  0x0c /* GPIO interrupt enable */
 403 #define IOVR  0x10 /* GPIO value */
 404 #define IOSR  0x14 /* GPIO interrupt status */
 405 #define TDR   0x80 /* tx data */
 406 #define RDR   0x80 /* rx data */
 407 #define TCR   0x82 /* tx control */
 408 #define TIR   0x84 /* tx idle */
 409 #define TPR   0x85 /* tx preamble */
 410 #define RCR   0x86 /* rx control */
 411 #define VCR   0x88 /* V.24 control */
 412 #define CCR   0x89 /* clock control */
 413 #define BDR   0x8a /* baud divisor */
 414 #define SCR   0x8c /* serial control */
 415 #define SSR   0x8e /* serial status */
 416 #define RDCSR 0x90 /* rx DMA control/status */
 417 #define TDCSR 0x94 /* tx DMA control/status */
 418 #define RDDAR 0x98 /* rx DMA descriptor address */
 419 #define TDDAR 0x9c /* tx DMA descriptor address */
 420
 421 #define RXIDLE      BIT14
 422 #define RXBREAK     BIT14
 423 #define IRQ_TXDATA  BIT13
 424 #define IRQ_TXIDLE  BIT12
 425 #define IRQ_TXUNDER BIT11 /* HDLC */
 426 #define IRQ_RXDATA  BIT10
 427 #define IRQ_RXIDLE  BIT9  /* HDLC */
 428 #define IRQ_RXBREAK BIT9  /* async */
 429 #define IRQ_RXOVER  BIT8
 430 #define IRQ_DSR     BIT7
 431 #define IRQ_CTS     BIT6
 432 #define IRQ_DCD     BIT5
 433 #define IRQ_RI      BIT4
 434 #define IRQ_ALL     0x3ff0
 435 #define IRQ_MASTER  BIT0
 436
 437 #define slgt_irq_on(info, mask) \
 438         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
 439 #define slgt_irq_off(info, mask) \
 440         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
 441
 442 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
 443 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
 444 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
 445 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
 446 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
 447 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
 448
 449 static void  msc_set_vcr(struct slgt_info *info);
 450
 451 static int  startup(struct slgt_info *info);
 452 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
 453 static void shutdown(struct slgt_info *info);
 454 static void program_hw(struct slgt_info *info);
 455 static void change_params(struct slgt_info *info);
 456
 457 static int  register_test(struct slgt_info *info);
 458 static int  irq_test(struct slgt_info *info);
 459 static int  loopback_test(struct slgt_info *info);
 460 static int  adapter_test(struct slgt_info *info);
 461
 462 static void reset_adapter(struct slgt_info *info);
 463 static void reset_port(struct slgt_info *info);
 464 static void async_mode(struct slgt_info *info);
 465 static void hdlc_mode(struct slgt_info *info);
 466
 467 static void rx_stop(struct slgt_info *info);
 468 static void rx_start(struct slgt_info *info);
 469 static void reset_rbufs(struct slgt_info *info);
 470 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
 471 static void rdma_reset(struct slgt_info *info);
 472 static int  rx_get_frame(struct slgt_info *info);
 473 static int  rx_get_buf(struct slgt_info *info);
 474
 475 static void tx_start(struct slgt_info *info);
 476 static void tx_stop(struct slgt_info *info);
 477 static void tx_set_idle(struct slgt_info *info);
 478 static unsigned int free_tbuf_count(struct slgt_info *info);
 479 static void reset_tbufs(struct slgt_info *info);
 480 static void tdma_reset(struct slgt_info *info);
 481 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
 482
 483 static void get_signals(struct slgt_info *info);
 484 static void set_signals(struct slgt_info *info);
 485 static void enable_loopback(struct slgt_info *info);
 486 static void set_rate(struct slgt_info *info, u32 data_rate);
 487
 488 static int  bh_action(struct slgt_info *info);
 489 static void bh_handler(void* context);
 490 static void bh_transmit(struct slgt_info *info);
 491 static void isr_serial(struct slgt_info *info);
 492 static void isr_rdma(struct slgt_info *info);
 493 static void isr_txeom(struct slgt_info *info, unsigned short status);
 494 static void isr_tdma(struct slgt_info *info);
 495 static irqreturn_t slgt_interrupt(int irq, void *dev_id, struct pt_regs * regs);
 496
 497 static int  alloc_dma_bufs(struct slgt_info *info);
 498 static void free_dma_bufs(struct slgt_info *info);
 499 static int  alloc_desc(struct slgt_info *info);
 500 static void free_desc(struct slgt_info *info);
 501 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
 502 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
 503
 504 static int  alloc_tmp_rbuf(struct slgt_info *info);
 505 static void free_tmp_rbuf(struct slgt_info *info);
 506
 507 static void tx_timeout(unsigned long context);
 508 static void rx_timeout(unsigned long context);
 509
 510 /*
 511  * ioctl handlers
 512  */
 513 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
 514 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
 515 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
 516 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
 517 static int  set_txidle(struct slgt_info *info, int idle_mode);
 518 static int  tx_enable(struct slgt_info *info, int enable);
 519 static int  tx_abort(struct slgt_info *info);
 520 static int  rx_enable(struct slgt_info *info, int enable);
 521 static int  modem_input_wait(struct slgt_info *info,int arg);
 522 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
 523 static int  tiocmget(struct tty_struct *tty, struct file *file);
 524 static int  tiocmset(struct tty_struct *tty, struct file *file,
 525                      unsigned int set, unsigned int clear);
 526 static void set_break(struct tty_struct *tty, int break_state);
 527 static int  get_interface(struct slgt_info *info, int __user *if_mode);
 528 static int  set_interface(struct slgt_info *info, int if_mode);
 529 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 530 static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 531 static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 532
 533 /*
 534  * driver functions
 535  */
 536 static void add_device(struct slgt_info *info);
 537 static void device_init(int adapter_num, struct pci_dev *pdev);
 538 static int  claim_resources(struct slgt_info *info);
 539 static void release_resources(struct slgt_info *info);
 540
 541 /*
 542  * DEBUG OUTPUT CODE
 543  */
 544 #ifndef DBGINFO
 545 #define DBGINFO(fmt)
 546 #endif
 547 #ifndef DBGERR
 548 #define DBGERR(fmt)
 549 #endif
 550 #ifndef DBGBH
 551 #define DBGBH(fmt)
 552 #endif
 553 #ifndef DBGISR
 554 #define DBGISR(fmt)
 555 #endif
 556
 557 #ifdef DBGDATA
 558 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
 559 {
 560         int i;
 561         int linecount;
 562         printk("%s %s data:\n",info->device_name, label);
 563         while(count) {
 564                 linecount = (count > 16) ? 16 : count;
 565                 for(i=0; i < linecount; i++)
 566                         printk("%02X ",(unsigned char)data[i]);
 567                 for(;i<17;i++)
 568                         printk("   ");
 569                 for(i=0;i<linecount;i++) {
 570                         if (data[i]>=040 && data[i]<=0176)
 571                                 printk("%c",data[i]);
 572                         else
 573                                 printk(".");
 574                 }
 575                 printk("\n");
 576                 data  += linecount;
 577                 count -= linecount;
 578         }
 579 }
 580 #else
 581 #define DBGDATA(info, buf, size, label)
 582 #endif
 583
 584 #ifdef DBGTBUF
 585 static void dump_tbufs(struct slgt_info *info)
 586 {
 587         int i;
 588         printk("tbuf_current=%d\n", info->tbuf_current);
 589         for (i=0 ; i < info->tbuf_count ; i++) {
 590                 printk("%d: count=%04X status=%04X\n",
 591                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
 592         }
 593 }
 594 #else
 595 #define DBGTBUF(info)
 596 #endif
 597
 598 #ifdef DBGRBUF
 599 static void dump_rbufs(struct slgt_info *info)
 600 {
 601         int i;
 602         printk("rbuf_current=%d\n", info->rbuf_current);
 603         for (i=0 ; i < info->rbuf_count ; i++) {
 604                 printk("%d: count=%04X status=%04X\n",
 605                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
 606         }
 607 }
 608 #else
 609 #define DBGRBUF(info)
 610 #endif
 611
 612 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
 613 {
 614 #ifdef SANITY_CHECK
 615         if (!info) {
 616                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
 617                 return 1;
 618         }
 619         if (info->magic != MGSL_MAGIC) {
 620                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
 621                 return 1;
 622         }
 623 #else
 624         if (!info)
 625                 return 1;
 626 #endif
 627         return 0;
 628 }
 629
 630 /**
 631  * line discipline callback wrappers
 632  *
 633  * The wrappers maintain line discipline references
 634  * while calling into the line discipline.
 635  *
 636  * ldisc_receive_buf  - pass receive data to line discipline
 637  */
 638 static void ldisc_receive_buf(struct tty_struct *tty,
 639                               const __u8 *data, char *flags, int count)
 640 {
 641         struct tty_ldisc *ld;
 642         if (!tty)
 643                 return;
 644         ld = tty_ldisc_ref(tty);
 645         if (ld) {
 646                 if (ld->receive_buf)
 647                         ld->receive_buf(tty, data, flags, count);
 648                 tty_ldisc_deref(ld);
 649         }
 650 }
 651
 652 /* tty callbacks */
 653
 654 static int open(struct tty_struct *tty, struct file *filp)
 655 {
 656         struct slgt_info *info;
 657         int retval, line;
 658         unsigned long flags;
 659
 660         line = tty->index;
 661         if ((line < 0) || (line >= slgt_device_count)) {
 662                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
 663                 return -ENODEV;
 664         }
 665
 666         info = slgt_device_list;
 667         while(info && info->line != line)
 668                 info = info->next_device;
 669         if (sanity_check(info, tty->name, "open"))
 670                 return -ENODEV;
 671         if (info->init_error) {
 672                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
 673                 return -ENODEV;
 674         }
 675
 676         tty->driver_data = info;
 677         info->tty = tty;
 678
 679         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->count));
 680
 681         /* If port is closing, signal caller to try again */
 682         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
 683                 if (info->flags & ASYNC_CLOSING)
 684                         interruptible_sleep_on(&info->close_wait);
 685                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
 686                         -EAGAIN : -ERESTARTSYS);
 687                 goto cleanup;
 688         }
 689
 690         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 691
 692         spin_lock_irqsave(&info->netlock, flags);
 693         if (info->netcount) {
 694                 retval = -EBUSY;
 695                 spin_unlock_irqrestore(&info->netlock, flags);
 696                 goto cleanup;
 697         }
 698         info->count++;
 699         spin_unlock_irqrestore(&info->netlock, flags);
 700
 701         if (info->count == 1) {
 702                 /* 1st open on this device, init hardware */
 703                 retval = startup(info);
 704                 if (retval < 0)
 705                         goto cleanup;
 706         }
 707
 708         retval = block_til_ready(tty, filp, info);
 709         if (retval) {
 710                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
 711                 goto cleanup;
 712         }
 713
 714         retval = 0;
 715
 716 cleanup:
 717         if (retval) {
 718                 if (tty->count == 1)
 719                         info->tty = NULL; /* tty layer will release tty struct */
 720                 if(info->count)
 721                         info->count--;
 722         }
 723
 724         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
 725         return retval;
 726 }
 727
 728 static void close(struct tty_struct *tty, struct file *filp)
 729 {
 730         struct slgt_info *info = tty->driver_data;
 731
 732         if (sanity_check(info, tty->name, "close"))
 733                 return;
 734         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->count));
 735
 736         if (!info->count)
 737                 return;
 738
 739         if (tty_hung_up_p(filp))
 740                 goto cleanup;
 741
 742         if ((tty->count == 1) && (info->count != 1)) {
 743                 /*
 744                  * tty->count is 1 and the tty structure will be freed.
 745                  * info->count should be one in this case.
 746                  * if it's not, correct it so that the port is shutdown.
 747                  */
 748                 DBGERR(("%s close: bad refcount; tty->count=1, "
 749                        "info->count=%d\n", info->device_name, info->count));
 750                 info->count = 1;
 751         }
 752
 753         info->count--;
 754
 755         /* if at least one open remaining, leave hardware active */
 756         if (info->count)
 757                 goto cleanup;
 758
 759         info->flags |= ASYNC_CLOSING;
 760
 761         /* set tty->closing to notify line discipline to
 762          * only process XON/XOFF characters. Only the N_TTY
 763          * discipline appears to use this (ppp does not).
 764          */
 765         tty->closing = 1;
 766
 767         /* wait for transmit data to clear all layers */
 768
 769         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
 770                 DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
 771                 tty_wait_until_sent(tty, info->closing_wait);
 772         }
 773
 774         if (info->flags & ASYNC_INITIALIZED)
 775                 wait_until_sent(tty, info->timeout);
 776         if (tty->driver->flush_buffer)
 777                 tty->driver->flush_buffer(tty);
 778         tty_ldisc_flush(tty);
 779
 780         shutdown(info);
 781
 782         tty->closing = 0;
 783         info->tty = NULL;
 784
 785         if (info->blocked_open) {
 786                 if (info->close_delay) {
 787                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
 788                 }
 789                 wake_up_interruptible(&info->open_wait);
 790         }
 791
 792         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 793
 794         wake_up_interruptible(&info->close_wait);
 795
 796 cleanup:
 797         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->count));
 798 }
 799
 800 static void hangup(struct tty_struct *tty)
 801 {
 802         struct slgt_info *info = tty->driver_data;
 803
 804         if (sanity_check(info, tty->name, "hangup"))
 805                 return;
 806         DBGINFO(("%s hangup\n", info->device_name));
 807
 808         flush_buffer(tty);
 809         shutdown(info);
 810
 811         info->count = 0;
 812         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 813         info->tty = NULL;
 814
 815         wake_up_interruptible(&info->open_wait);
 816 }
 817
 818 static void set_termios(struct tty_struct *tty, struct termios *old_termios)
 819 {
 820         struct slgt_info *info = tty->driver_data;
 821         unsigned long flags;
 822
 823         DBGINFO(("%s set_termios\n", tty->driver->name));
 824
 825         /* just return if nothing has changed */
 826         if ((tty->termios->c_cflag == old_termios->c_cflag)
 827             && (RELEVANT_IFLAG(tty->termios->c_iflag)
 828                 == RELEVANT_IFLAG(old_termios->c_iflag)))
 829                 return;
 830
 831         change_params(info);
 832
 833         /* Handle transition to B0 status */
 834         if (old_termios->c_cflag & CBAUD &&
 835             !(tty->termios->c_cflag & CBAUD)) {
 836                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 837                 spin_lock_irqsave(&info->lock,flags);
 838                 set_signals(info);
 839                 spin_unlock_irqrestore(&info->lock,flags);
 840         }
 841
 842         /* Handle transition away from B0 status */
 843         if (!(old_termios->c_cflag & CBAUD) &&
 844             tty->termios->c_cflag & CBAUD) {
 845                 info->signals |= SerialSignal_DTR;
 846                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 847                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 848                         info->signals |= SerialSignal_RTS;
 849                 }
 850                 spin_lock_irqsave(&info->lock,flags);
 851                 set_signals(info);
 852                 spin_unlock_irqrestore(&info->lock,flags);
 853         }
 854
 855         /* Handle turning off CRTSCTS */
 856         if (old_termios->c_cflag & CRTSCTS &&
 857             !(tty->termios->c_cflag & CRTSCTS)) {
 858                 tty->hw_stopped = 0;
 859                 tx_release(tty);
 860         }
 861 }
 862
 863 static int write(struct tty_struct *tty,
 864                  const unsigned char *buf, int count)
 865 {
 866         int ret = 0;
 867         struct slgt_info *info = tty->driver_data;
 868         unsigned long flags;
 869
 870         if (sanity_check(info, tty->name, "write"))
 871                 goto cleanup;
 872         DBGINFO(("%s write count=%d\n", info->device_name, count));
 873
 874         if (!info->tx_buf)
 875                 goto cleanup;
 876
 877         if (count > info->max_frame_size) {
 878                 ret = -EIO;
 879                 goto cleanup;
 880         }
 881
 882         if (!count)
 883                 goto cleanup;
 884
 885         if (info->params.mode == MGSL_MODE_RAW) {
 886                 unsigned int bufs_needed = (count/DMABUFSIZE);
 887                 unsigned int bufs_free = free_tbuf_count(info);
 888                 if (count % DMABUFSIZE)
 889                         ++bufs_needed;
 890                 if (bufs_needed > bufs_free)
 891                         goto cleanup;
 892         } else {
 893                 if (info->tx_active)
 894                         goto cleanup;
 895                 if (info->tx_count) {
 896                         /* send accumulated data from send_char() calls */
 897                         /* as frame and wait before accepting more data. */
 898                         tx_load(info, info->tx_buf, info->tx_count);
 899                         goto start;
 900                 }
 901         }
 902
 903         ret = info->tx_count = count;
 904         tx_load(info, buf, count);
 905         goto start;
 906
 907 start:
 908         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
 909                 spin_lock_irqsave(&info->lock,flags);
 910                 if (!info->tx_active)
 911                         tx_start(info);
 912                 spin_unlock_irqrestore(&info->lock,flags);
 913         }
 914
 915 cleanup:
 916         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
 917         return ret;
 918 }
 919
 920 static void put_char(struct tty_struct *tty, unsigned char ch)
 921 {
 922         struct slgt_info *info = tty->driver_data;
 923         unsigned long flags;
 924
 925         if (sanity_check(info, tty->name, "put_char"))
 926                 return;
 927         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
 928         if (!info->tx_buf)
 929                 return;
 930         spin_lock_irqsave(&info->lock,flags);
 931         if (!info->tx_active && (info->tx_count < info->max_frame_size))
 932                 info->tx_buf[info->tx_count++] = ch;
 933         spin_unlock_irqrestore(&info->lock,flags);
 934 }
 935
 936 static void send_xchar(struct tty_struct *tty, char ch)
 937 {
 938         struct slgt_info *info = tty->driver_data;
 939         unsigned long flags;
 940
 941         if (sanity_check(info, tty->name, "send_xchar"))
 942                 return;
 943         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
 944         info->x_char = ch;
 945         if (ch) {
 946                 spin_lock_irqsave(&info->lock,flags);
 947                 if (!info->tx_enabled)
 948                         tx_start(info);
 949                 spin_unlock_irqrestore(&info->lock,flags);
 950         }
 951 }
 952
 953 static void wait_until_sent(struct tty_struct *tty, int timeout)
 954 {
 955         struct slgt_info *info = tty->driver_data;
 956         unsigned long orig_jiffies, char_time;
 957
 958         if (!info )
 959                 return;
 960         if (sanity_check(info, tty->name, "wait_until_sent"))
 961                 return;
 962         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
 963         if (!(info->flags & ASYNC_INITIALIZED))
 964                 goto exit;
 965
 966         orig_jiffies = jiffies;
 967
 968         /* Set check interval to 1/5 of estimated time to
 969          * send a character, and make it at least 1. The check
 970          * interval should also be less than the timeout.
 971          * Note: use tight timings here to satisfy the NIST-PCTS.
 972          */
 973
 974         if (info->params.data_rate) {
 975                 char_time = info->timeout/(32 * 5);
 976                 if (!char_time)
 977                         char_time++;
 978         } else
 979                 char_time = 1;
 980
 981         if (timeout)
 982                 char_time = min_t(unsigned long, char_time, timeout);
 983
 984         while (info->tx_active) {
 985                 msleep_interruptible(jiffies_to_msecs(char_time));
 986                 if (signal_pending(current))
 987                         break;
 988                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 989                         break;
 990         }
 991
 992 exit:
 993         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
 994 }
 995
 996 static int write_room(struct tty_struct *tty)
 997 {
 998         struct slgt_info *info = tty->driver_data;
 999         int ret;
1000
1001         if (sanity_check(info, tty->name, "write_room"))
1002                 return 0;
1003         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1004         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
1005         return ret;
1006 }
1007
1008 static void flush_chars(struct tty_struct *tty)
1009 {
1010         struct slgt_info *info = tty->driver_data;
1011         unsigned long flags;
1012
1013         if (sanity_check(info, tty->name, "flush_chars"))
1014                 return;
1015         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
1016
1017         if (info->tx_count <= 0 || tty->stopped ||
1018             tty->hw_stopped || !info->tx_buf)
1019                 return;
1020
1021         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
1022
1023         spin_lock_irqsave(&info->lock,flags);
1024         if (!info->tx_active && info->tx_count) {
1025                 tx_load(info, info->tx_buf,info->tx_count);
1026                 tx_start(info);
1027         }
1028         spin_unlock_irqrestore(&info->lock,flags);
1029 }
1030
1031 static void flush_buffer(struct tty_struct *tty)
1032 {
1033         struct slgt_info *info = tty->driver_data;
1034         unsigned long flags;
1035
1036         if (sanity_check(info, tty->name, "flush_buffer"))
1037                 return;
1038         DBGINFO(("%s flush_buffer\n", info->device_name));
1039
1040         spin_lock_irqsave(&info->lock,flags);
1041         if (!info->tx_active)
1042                 info->tx_count = 0;
1043         spin_unlock_irqrestore(&info->lock,flags);
1044
1045         wake_up_interruptible(&tty->write_wait);
1046         tty_wakeup(tty);
1047 }
1048
1049 /*
1050  * throttle (stop) transmitter
1051  */
1052 static void tx_hold(struct tty_struct *tty)
1053 {
1054         struct slgt_info *info = tty->driver_data;
1055         unsigned long flags;
1056
1057         if (sanity_check(info, tty->name, "tx_hold"))
1058                 return;
1059         DBGINFO(("%s tx_hold\n", info->device_name));
1060         spin_lock_irqsave(&info->lock,flags);
1061         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1062                 tx_stop(info);
1063         spin_unlock_irqrestore(&info->lock,flags);
1064 }
1065
1066 /*
1067  * release (start) transmitter
1068  */
1069 static void tx_release(struct tty_struct *tty)
1070 {
1071         struct slgt_info *info = tty->driver_data;
1072         unsigned long flags;
1073
1074         if (sanity_check(info, tty->name, "tx_release"))
1075                 return;
1076         DBGINFO(("%s tx_release\n", info->device_name));
1077         spin_lock_irqsave(&info->lock,flags);
1078         if (!info->tx_active && info->tx_count) {
1079                 tx_load(info, info->tx_buf, info->tx_count);
1080                 tx_start(info);
1081         }
1082         spin_unlock_irqrestore(&info->lock,flags);
1083 }
1084
1085 /*
1086  * Service an IOCTL request
1087  *
1088  * Arguments
1089  *
1090  *      tty     pointer to tty instance data
1091  *      file    pointer to associated file object for device
1092  *      cmd     IOCTL command code
1093  *      arg     command argument/context
1094  *
1095  * Return 0 if success, otherwise error code
1096  */
1097 static int ioctl(struct tty_struct *tty, struct file *file,
1098                  unsigned int cmd, unsigned long arg)
1099 {
1100         struct slgt_info *info = tty->driver_data;
1101         struct mgsl_icount cnow;        /* kernel counter temps */
1102         struct serial_icounter_struct __user *p_cuser;  /* user space */
1103         unsigned long flags;
1104         void __user *argp = (void __user *)arg;
1105
1106         if (sanity_check(info, tty->name, "ioctl"))
1107                 return -ENODEV;
1108         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1109
1110         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1111             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1112                 if (tty->flags & (1 << TTY_IO_ERROR))
1113                     return -EIO;
1114         }
1115
1116         switch (cmd) {
1117         case MGSL_IOCGPARAMS:
1118                 return get_params(info, argp);
1119         case MGSL_IOCSPARAMS:
1120                 return set_params(info, argp);
1121         case MGSL_IOCGTXIDLE:
1122                 return get_txidle(info, argp);
1123         case MGSL_IOCSTXIDLE:
1124                 return set_txidle(info, (int)arg);
1125         case MGSL_IOCTXENABLE:
1126                 return tx_enable(info, (int)arg);
1127         case MGSL_IOCRXENABLE:
1128                 return rx_enable(info, (int)arg);
1129         case MGSL_IOCTXABORT:
1130                 return tx_abort(info);
1131         case MGSL_IOCGSTATS:
1132                 return get_stats(info, argp);
1133         case MGSL_IOCWAITEVENT:
1134                 return wait_mgsl_event(info, argp);
1135         case TIOCMIWAIT:
1136                 return modem_input_wait(info,(int)arg);
1137         case MGSL_IOCGIF:
1138                 return get_interface(info, argp);
1139         case MGSL_IOCSIF:
1140                 return set_interface(info,(int)arg);
1141         case MGSL_IOCSGPIO:
1142                 return set_gpio(info, argp);
1143         case MGSL_IOCGGPIO:
1144                 return get_gpio(info, argp);
1145         case MGSL_IOCWAITGPIO:
1146                 return wait_gpio(info, argp);
1147         case TIOCGICOUNT:
1148                 spin_lock_irqsave(&info->lock,flags);
1149                 cnow = info->icount;
1150                 spin_unlock_irqrestore(&info->lock,flags);
1151                 p_cuser = argp;
1152                 if (put_user(cnow.cts, &p_cuser->cts) ||
1153                     put_user(cnow.dsr, &p_cuser->dsr) ||
1154                     put_user(cnow.rng, &p_cuser->rng) ||
1155                     put_user(cnow.dcd, &p_cuser->dcd) ||
1156                     put_user(cnow.rx, &p_cuser->rx) ||
1157                     put_user(cnow.tx, &p_cuser->tx) ||
1158                     put_user(cnow.frame, &p_cuser->frame) ||
1159                     put_user(cnow.overrun, &p_cuser->overrun) ||
1160                     put_user(cnow.parity, &p_cuser->parity) ||
1161                     put_user(cnow.brk, &p_cuser->brk) ||
1162                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1163                         return -EFAULT;
1164                 return 0;
1165         default:
1166                 return -ENOIOCTLCMD;
1167         }
1168         return 0;
1169 }
1170
1171 /*
1172  * proc fs support
1173  */
1174 static inline int line_info(char *buf, struct slgt_info *info)
1175 {
1176         char stat_buf[30];
1177         int ret;
1178         unsigned long flags;
1179
1180         ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1181                       info->device_name, info->phys_reg_addr,
1182                       info->irq_level, info->max_frame_size);
1183
1184         /* output current serial signal states */
1185         spin_lock_irqsave(&info->lock,flags);
1186         get_signals(info);
1187         spin_unlock_irqrestore(&info->lock,flags);
1188
1189         stat_buf[0] = 0;
1190         stat_buf[1] = 0;
1191         if (info->signals & SerialSignal_RTS)
1192                 strcat(stat_buf, "|RTS");
1193         if (info->signals & SerialSignal_CTS)
1194                 strcat(stat_buf, "|CTS");
1195         if (info->signals & SerialSignal_DTR)
1196                 strcat(stat_buf, "|DTR");
1197         if (info->signals & SerialSignal_DSR)
1198                 strcat(stat_buf, "|DSR");
1199         if (info->signals & SerialSignal_DCD)
1200                 strcat(stat_buf, "|CD");
1201         if (info->signals & SerialSignal_RI)
1202                 strcat(stat_buf, "|RI");
1203
1204         if (info->params.mode != MGSL_MODE_ASYNC) {
1205                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1206                                info->icount.txok, info->icount.rxok);
1207                 if (info->icount.txunder)
1208                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1209                 if (info->icount.txabort)
1210                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1211                 if (info->icount.rxshort)
1212                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1213                 if (info->icount.rxlong)
1214                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1215                 if (info->icount.rxover)
1216                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1217                 if (info->icount.rxcrc)
1218                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1219         } else {
1220                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1221                                info->icount.tx, info->icount.rx);
1222                 if (info->icount.frame)
1223                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1224                 if (info->icount.parity)
1225                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1226                 if (info->icount.brk)
1227                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1228                 if (info->icount.overrun)
1229                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1230         }
1231
1232         /* Append serial signal status to end */
1233         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1234
1235         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1236                        info->tx_active,info->bh_requested,info->bh_running,
1237                        info->pending_bh);
1238
1239         return ret;
1240 }
1241
1242 /* Called to print information about devices
1243  */
1244 static int read_proc(char *page, char **start, off_t off, int count,
1245                      int *eof, void *data)
1246 {
1247         int len = 0, l;
1248         off_t   begin = 0;
1249         struct slgt_info *info;
1250
1251         len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
1252
1253         info = slgt_device_list;
1254         while( info ) {
1255                 l = line_info(page + len, info);
1256                 len += l;
1257                 if (len+begin > off+count)
1258                         goto done;
1259                 if (len+begin < off) {
1260                         begin += len;
1261                         len = 0;
1262                 }
1263                 info = info->next_device;
1264         }
1265
1266         *eof = 1;
1267 done:
1268         if (off >= len+begin)
1269                 return 0;
1270         *start = page + (off-begin);
1271         return ((count < begin+len-off) ? count : begin+len-off);
1272 }
1273
1274 /*
1275  * return count of bytes in transmit buffer
1276  */
1277 static int chars_in_buffer(struct tty_struct *tty)
1278 {
1279         struct slgt_info *info = tty->driver_data;
1280         if (sanity_check(info, tty->name, "chars_in_buffer"))
1281                 return 0;
1282         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, info->tx_count));
1283         return info->tx_count;
1284 }
1285
1286 /*
1287  * signal remote device to throttle send data (our receive data)
1288  */
1289 static void throttle(struct tty_struct * tty)
1290 {
1291         struct slgt_info *info = tty->driver_data;
1292         unsigned long flags;
1293
1294         if (sanity_check(info, tty->name, "throttle"))
1295                 return;
1296         DBGINFO(("%s throttle\n", info->device_name));
1297         if (I_IXOFF(tty))
1298                 send_xchar(tty, STOP_CHAR(tty));
1299         if (tty->termios->c_cflag & CRTSCTS) {
1300                 spin_lock_irqsave(&info->lock,flags);
1301                 info->signals &= ~SerialSignal_RTS;
1302                 set_signals(info);
1303                 spin_unlock_irqrestore(&info->lock,flags);
1304         }
1305 }
1306
1307 /*
1308  * signal remote device to stop throttling send data (our receive data)
1309  */
1310 static void unthrottle(struct tty_struct * tty)
1311 {
1312         struct slgt_info *info = tty->driver_data;
1313         unsigned long flags;
1314
1315         if (sanity_check(info, tty->name, "unthrottle"))
1316                 return;
1317         DBGINFO(("%s unthrottle\n", info->device_name));
1318         if (I_IXOFF(tty)) {
1319                 if (info->x_char)
1320                         info->x_char = 0;
1321                 else
1322                         send_xchar(tty, START_CHAR(tty));
1323         }
1324         if (tty->termios->c_cflag & CRTSCTS) {
1325                 spin_lock_irqsave(&info->lock,flags);
1326                 info->signals |= SerialSignal_RTS;
1327                 set_signals(info);
1328                 spin_unlock_irqrestore(&info->lock,flags);
1329         }
1330 }
1331
1332 /*
1333  * set or clear transmit break condition
1334  * break_state  -1=set break condition, 0=clear
1335  */
1336 static void set_break(struct tty_struct *tty, int break_state)
1337 {
1338         struct slgt_info *info = tty->driver_data;
1339         unsigned short value;
1340         unsigned long flags;
1341
1342         if (sanity_check(info, tty->name, "set_break"))
1343                 return;
1344         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1345
1346         spin_lock_irqsave(&info->lock,flags);
1347         value = rd_reg16(info, TCR);
1348         if (break_state == -1)
1349                 value |= BIT6;
1350         else
1351                 value &= ~BIT6;
1352         wr_reg16(info, TCR, value);
1353         spin_unlock_irqrestore(&info->lock,flags);
1354 }
1355
1356 #ifdef CONFIG_HDLC
1357
1358 /**
1359  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1360  * set encoding and frame check sequence (FCS) options
1361  *
1362  * dev       pointer to network device structure
1363  * encoding  serial encoding setting
1364  * parity    FCS setting
1365  *
1366  * returns 0 if success, otherwise error code
1367  */
1368 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1369                           unsigned short parity)
1370 {
1371         struct slgt_info *info = dev_to_port(dev);
1372         unsigned char  new_encoding;
1373         unsigned short new_crctype;
1374
1375         /* return error if TTY interface open */
1376         if (info->count)
1377                 return -EBUSY;
1378
1379         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1380
1381         switch (encoding)
1382         {
1383         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1384         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1385         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1386         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1387         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1388         default: return -EINVAL;
1389         }
1390
1391         switch (parity)
1392         {
1393         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1394         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1395         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1396         default: return -EINVAL;
1397         }
1398
1399         info->params.encoding = new_encoding;
1400         info->params.crc_type = new_crctype;
1401
1402         /* if network interface up, reprogram hardware */
1403         if (info->netcount)
1404                 program_hw(info);
1405
1406         return 0;
1407 }
1408
1409 /**
1410  * called by generic HDLC layer to send frame
1411  *
1412  * skb  socket buffer containing HDLC frame
1413  * dev  pointer to network device structure
1414  *
1415  * returns 0 if success, otherwise error code
1416  */
1417 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1418 {
1419         struct slgt_info *info = dev_to_port(dev);
1420         struct net_device_stats *stats = hdlc_stats(dev);
1421         unsigned long flags;
1422
1423         DBGINFO(("%s hdlc_xmit\n", dev->name));
1424
1425         /* stop sending until this frame completes */
1426         netif_stop_queue(dev);
1427
1428         /* copy data to device buffers */
1429         info->tx_count = skb->len;
1430         tx_load(info, skb->data, skb->len);
1431
1432         /* update network statistics */
1433         stats->tx_packets++;
1434         stats->tx_bytes += skb->len;
1435
1436         /* done with socket buffer, so free it */
1437         dev_kfree_skb(skb);
1438
1439         /* save start time for transmit timeout detection */
1440         dev->trans_start = jiffies;
1441
1442         /* start hardware transmitter if necessary */
1443         spin_lock_irqsave(&info->lock,flags);
1444         if (!info->tx_active)
1445                 tx_start(info);
1446         spin_unlock_irqrestore(&info->lock,flags);
1447
1448         return 0;
1449 }
1450
1451 /**
1452  * called by network layer when interface enabled
1453  * claim resources and initialize hardware
1454  *
1455  * dev  pointer to network device structure
1456  *
1457  * returns 0 if success, otherwise error code
1458  */
1459 static int hdlcdev_open(struct net_device *dev)
1460 {
1461         struct slgt_info *info = dev_to_port(dev);
1462         int rc;
1463         unsigned long flags;
1464
1465         DBGINFO(("%s hdlcdev_open\n", dev->name));
1466
1467         /* generic HDLC layer open processing */
1468         if ((rc = hdlc_open(dev)))
1469                 return rc;
1470
1471         /* arbitrate between network and tty opens */
1472         spin_lock_irqsave(&info->netlock, flags);
1473         if (info->count != 0 || info->netcount != 0) {
1474                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1475                 spin_unlock_irqrestore(&info->netlock, flags);
1476                 return -EBUSY;
1477         }
1478         info->netcount=1;
1479         spin_unlock_irqrestore(&info->netlock, flags);
1480
1481         /* claim resources and init adapter */
1482         if ((rc = startup(info)) != 0) {
1483                 spin_lock_irqsave(&info->netlock, flags);
1484                 info->netcount=0;
1485                 spin_unlock_irqrestore(&info->netlock, flags);
1486                 return rc;
1487         }
1488
1489         /* assert DTR and RTS, apply hardware settings */
1490         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1491         program_hw(info);
1492
1493         /* enable network layer transmit */
1494         dev->trans_start = jiffies;
1495         netif_start_queue(dev);
1496
1497         /* inform generic HDLC layer of current DCD status */
1498         spin_lock_irqsave(&info->lock, flags);
1499         get_signals(info);
1500         spin_unlock_irqrestore(&info->lock, flags);
1501         hdlc_set_carrier(info->signals & SerialSignal_DCD, dev);
1502
1503         return 0;
1504 }
1505
1506 /**
1507  * called by network layer when interface is disabled
1508  * shutdown hardware and release resources
1509  *
1510  * dev  pointer to network device structure
1511  *
1512  * returns 0 if success, otherwise error code
1513  */
1514 static int hdlcdev_close(struct net_device *dev)
1515 {
1516         struct slgt_info *info = dev_to_port(dev);
1517         unsigned long flags;
1518
1519         DBGINFO(("%s hdlcdev_close\n", dev->name));
1520
1521         netif_stop_queue(dev);
1522
1523         /* shutdown adapter and release resources */
1524         shutdown(info);
1525
1526         hdlc_close(dev);
1527
1528         spin_lock_irqsave(&info->netlock, flags);
1529         info->netcount=0;
1530         spin_unlock_irqrestore(&info->netlock, flags);
1531
1532         return 0;
1533 }
1534
1535 /**
1536  * called by network layer to process IOCTL call to network device
1537  *
1538  * dev  pointer to network device structure
1539  * ifr  pointer to network interface request structure
1540  * cmd  IOCTL command code
1541  *
1542  * returns 0 if success, otherwise error code
1543  */
1544 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1545 {
1546         const size_t size = sizeof(sync_serial_settings);
1547         sync_serial_settings new_line;
1548         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1549         struct slgt_info *info = dev_to_port(dev);
1550         unsigned int flags;
1551
1552         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1553
1554         /* return error if TTY interface open */
1555         if (info->count)
1556                 return -EBUSY;
1557
1558         if (cmd != SIOCWANDEV)
1559                 return hdlc_ioctl(dev, ifr, cmd);
1560
1561         switch(ifr->ifr_settings.type) {
1562         case IF_GET_IFACE: /* return current sync_serial_settings */
1563
1564                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1565                 if (ifr->ifr_settings.size < size) {
1566                         ifr->ifr_settings.size = size; /* data size wanted */
1567                         return -ENOBUFS;
1568                 }
1569
1570                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1571                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1572                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1573                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1574
1575                 switch (flags){
1576                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1577                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1578                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1579                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1580                 default: new_line.clock_type = CLOCK_DEFAULT;
1581                 }
1582
1583                 new_line.clock_rate = info->params.clock_speed;
1584                 new_line.loopback   = info->params.loopback ? 1:0;
1585
1586                 if (copy_to_user(line, &new_line, size))
1587                         return -EFAULT;
1588                 return 0;
1589
1590         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1591
1592                 if(!capable(CAP_NET_ADMIN))
1593                         return -EPERM;
1594                 if (copy_from_user(&new_line, line, size))
1595                         return -EFAULT;
1596
1597                 switch (new_line.clock_type)
1598                 {
1599                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1600                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1601                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1602                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1603                 case CLOCK_DEFAULT:  flags = info->params.flags &
1604                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1605                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1606                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1607                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1608                 default: return -EINVAL;
1609                 }
1610
1611                 if (new_line.loopback != 0 && new_line.loopback != 1)
1612                         return -EINVAL;
1613
1614                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1615                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1616                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1617                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1618                 info->params.flags |= flags;
1619
1620                 info->params.loopback = new_line.loopback;
1621
1622                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1623                         info->params.clock_speed = new_line.clock_rate;
1624                 else
1625                         info->params.clock_speed = 0;
1626
1627                 /* if network interface up, reprogram hardware */
1628                 if (info->netcount)
1629                         program_hw(info);
1630                 return 0;
1631
1632         default:
1633                 return hdlc_ioctl(dev, ifr, cmd);
1634         }
1635 }
1636
1637 /**
1638  * called by network layer when transmit timeout is detected
1639  *
1640  * dev  pointer to network device structure
1641  */
1642 static void hdlcdev_tx_timeout(struct net_device *dev)
1643 {
1644         struct slgt_info *info = dev_to_port(dev);
1645         struct net_device_stats *stats = hdlc_stats(dev);
1646         unsigned long flags;
1647
1648         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1649
1650         stats->tx_errors++;
1651         stats->tx_aborted_errors++;
1652
1653         spin_lock_irqsave(&info->lock,flags);
1654         tx_stop(info);
1655         spin_unlock_irqrestore(&info->lock,flags);
1656
1657         netif_wake_queue(dev);
1658 }
1659
1660 /**
1661  * called by device driver when transmit completes
1662  * reenable network layer transmit if stopped
1663  *
1664  * info  pointer to device instance information
1665  */
1666 static void hdlcdev_tx_done(struct slgt_info *info)
1667 {
1668         if (netif_queue_stopped(info->netdev))
1669                 netif_wake_queue(info->netdev);
1670 }
1671
1672 /**
1673  * called by device driver when frame received
1674  * pass frame to network layer
1675  *
1676  * info  pointer to device instance information
1677  * buf   pointer to buffer contianing frame data
1678  * size  count of data bytes in buf
1679  */
1680 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1681 {
1682         struct sk_buff *skb = dev_alloc_skb(size);
1683         struct net_device *dev = info->netdev;
1684         struct net_device_stats *stats = hdlc_stats(dev);
1685
1686         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1687
1688         if (skb == NULL) {
1689                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1690                 stats->rx_dropped++;
1691                 return;
1692         }
1693
1694         memcpy(skb_put(skb, size),buf,size);
1695
1696         skb->protocol = hdlc_type_trans(skb, info->netdev);
1697
1698         stats->rx_packets++;
1699         stats->rx_bytes += size;
1700
1701         netif_rx(skb);
1702
1703         info->netdev->last_rx = jiffies;
1704 }
1705
1706 /**
1707  * called by device driver when adding device instance
1708  * do generic HDLC initialization
1709  *
1710  * info  pointer to device instance information
1711  *
1712  * returns 0 if success, otherwise error code
1713  */
1714 static int hdlcdev_init(struct slgt_info *info)
1715 {
1716         int rc;
1717         struct net_device *dev;
1718         hdlc_device *hdlc;
1719
1720         /* allocate and initialize network and HDLC layer objects */
1721
1722         if (!(dev = alloc_hdlcdev(info))) {
1723                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1724                 return -ENOMEM;
1725         }
1726
1727         /* for network layer reporting purposes only */
1728         dev->mem_start = info->phys_reg_addr;
1729         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1730         dev->irq       = info->irq_level;
1731
1732         /* network layer callbacks and settings */
1733         dev->do_ioctl       = hdlcdev_ioctl;
1734         dev->open           = hdlcdev_open;
1735         dev->stop           = hdlcdev_close;
1736         dev->tx_timeout     = hdlcdev_tx_timeout;
1737         dev->watchdog_timeo = 10*HZ;
1738         dev->tx_queue_len   = 50;
1739
1740         /* generic HDLC layer callbacks and settings */
1741         hdlc         = dev_to_hdlc(dev);
1742         hdlc->attach = hdlcdev_attach;
1743         hdlc->xmit   = hdlcdev_xmit;
1744
1745         /* register objects with HDLC layer */
1746         if ((rc = register_hdlc_device(dev))) {
1747                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1748                 free_netdev(dev);
1749                 return rc;
1750         }
1751
1752         info->netdev = dev;
1753         return 0;
1754 }
1755
1756 /**
1757  * called by device driver when removing device instance
1758  * do generic HDLC cleanup
1759  *
1760  * info  pointer to device instance information
1761  */
1762 static void hdlcdev_exit(struct slgt_info *info)
1763 {
1764         unregister_hdlc_device(info->netdev);
1765         free_netdev(info->netdev);
1766         info->netdev = NULL;
1767 }
1768
1769 #endif /* ifdef CONFIG_HDLC */
1770
1771 /*
1772  * get async data from rx DMA buffers
1773  */
1774 static void rx_async(struct slgt_info *info)
1775 {
1776         struct tty_struct *tty = info->tty;
1777         struct mgsl_icount *icount = &info->icount;
1778         unsigned int start, end;
1779         unsigned char *p;
1780         unsigned char status;
1781         struct slgt_desc *bufs = info->rbufs;
1782         int i, count;
1783         int chars = 0;
1784         int stat;
1785         unsigned char ch;
1786
1787         start = end = info->rbuf_current;
1788
1789         while(desc_complete(bufs[end])) {
1790                 count = desc_count(bufs[end]) - info->rbuf_index;
1791                 p     = bufs[end].buf + info->rbuf_index;
1792
1793                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1794                 DBGDATA(info, p, count, "rx");
1795
1796                 for(i=0 ; i < count; i+=2, p+=2) {
1797                         ch = *p;
1798                         icount->rx++;
1799
1800                         stat = 0;
1801
1802                         if ((status = *(p+1) & (BIT9 + BIT8))) {
1803                                 if (status & BIT9)
1804                                         icount->parity++;
1805                                 else if (status & BIT8)
1806                                         icount->frame++;
1807                                 /* discard char if tty control flags say so */
1808                                 if (status & info->ignore_status_mask)
1809                                         continue;
1810                                 if (status & BIT9)
1811                                         stat = TTY_PARITY;
1812                                 else if (status & BIT8)
1813                                         stat = TTY_FRAME;
1814                         }
1815                         if (tty) {
1816                                 tty_insert_flip_char(tty, ch, stat);
1817                                 chars++;
1818                         }
1819                 }
1820
1821                 if (i < count) {
1822                         /* receive buffer not completed */
1823                         info->rbuf_index += i;
1824                         info->rx_timer.expires = jiffies + 1;
1825                         add_timer(&info->rx_timer);
1826                         break;
1827                 }
1828
1829                 info->rbuf_index = 0;
1830                 free_rbufs(info, end, end);
1831
1832                 if (++end == info->rbuf_count)
1833                         end = 0;
1834
1835                 /* if entire list searched then no frame available */
1836                 if (end == start)
1837                         break;
1838         }
1839
1840         if (tty && chars)
1841                 tty_flip_buffer_push(tty);
1842 }
1843
1844 /*
1845  * return next bottom half action to perform
1846  */
1847 static int bh_action(struct slgt_info *info)
1848 {
1849         unsigned long flags;
1850         int rc;
1851
1852         spin_lock_irqsave(&info->lock,flags);
1853
1854         if (info->pending_bh & BH_RECEIVE) {
1855                 info->pending_bh &= ~BH_RECEIVE;
1856                 rc = BH_RECEIVE;
1857         } else if (info->pending_bh & BH_TRANSMIT) {
1858                 info->pending_bh &= ~BH_TRANSMIT;
1859                 rc = BH_TRANSMIT;
1860         } else if (info->pending_bh & BH_STATUS) {
1861                 info->pending_bh &= ~BH_STATUS;
1862                 rc = BH_STATUS;
1863         } else {
1864                 /* Mark BH routine as complete */
1865                 info->bh_running   = 0;
1866                 info->bh_requested = 0;
1867                 rc = 0;
1868         }
1869
1870         spin_unlock_irqrestore(&info->lock,flags);
1871
1872         return rc;
1873 }
1874
1875 /*
1876  * perform bottom half processing
1877  */
1878 static void bh_handler(void* context)
1879 {
1880         struct slgt_info *info = context;
1881         int action;
1882
1883         if (!info)
1884                 return;
1885         info->bh_running = 1;
1886
1887         while((action = bh_action(info))) {
1888                 switch (action) {
1889                 case BH_RECEIVE:
1890                         DBGBH(("%s bh receive\n", info->device_name));
1891                         switch(info->params.mode) {
1892                         case MGSL_MODE_ASYNC:
1893                                 rx_async(info);
1894                                 break;
1895                         case MGSL_MODE_HDLC:
1896                                 while(rx_get_frame(info));
1897                                 break;
1898                         case MGSL_MODE_RAW:
1899                                 while(rx_get_buf(info));
1900                                 break;
1901                         }
1902                         /* restart receiver if rx DMA buffers exhausted */
1903                         if (info->rx_restart)
1904                                 rx_start(info);
1905                         break;
1906                 case BH_TRANSMIT:
1907                         bh_transmit(info);
1908                         break;
1909                 case BH_STATUS:
1910                         DBGBH(("%s bh status\n", info->device_name));
1911                         info->ri_chkcount = 0;
1912                         info->dsr_chkcount = 0;
1913                         info->dcd_chkcount = 0;
1914                         info->cts_chkcount = 0;
1915                         break;
1916                 default:
1917                         DBGBH(("%s unknown action\n", info->device_name));
1918                         break;
1919                 }
1920         }
1921         DBGBH(("%s bh_handler exit\n", info->device_name));
1922 }
1923
1924 static void bh_transmit(struct slgt_info *info)
1925 {
1926         struct tty_struct *tty = info->tty;
1927
1928         DBGBH(("%s bh_transmit\n", info->device_name));
1929         if (tty) {
1930                 tty_wakeup(tty);
1931                 wake_up_interruptible(&tty->write_wait);
1932         }
1933 }
1934
1935 static void dsr_change(struct slgt_info *info)
1936 {
1937         get_signals(info);
1938         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
1939         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1940                 slgt_irq_off(info, IRQ_DSR);
1941                 return;
1942         }
1943         info->icount.dsr++;
1944         if (info->signals & SerialSignal_DSR)
1945                 info->input_signal_events.dsr_up++;
1946         else
1947                 info->input_signal_events.dsr_down++;
1948         wake_up_interruptible(&info->status_event_wait_q);
1949         wake_up_interruptible(&info->event_wait_q);
1950         info->pending_bh |= BH_STATUS;
1951 }
1952
1953 static void cts_change(struct slgt_info *info)
1954 {
1955         get_signals(info);
1956         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
1957         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1958                 slgt_irq_off(info, IRQ_CTS);
1959                 return;
1960         }
1961         info->icount.cts++;
1962         if (info->signals & SerialSignal_CTS)
1963                 info->input_signal_events.cts_up++;
1964         else
1965                 info->input_signal_events.cts_down++;
1966         wake_up_interruptible(&info->status_event_wait_q);
1967         wake_up_interruptible(&info->event_wait_q);
1968         info->pending_bh |= BH_STATUS;
1969
1970         if (info->flags & ASYNC_CTS_FLOW) {
1971                 if (info->tty) {
1972                         if (info->tty->hw_stopped) {
1973                                 if (info->signals & SerialSignal_CTS) {
1974                                         info->tty->hw_stopped = 0;
1975                                         info->pending_bh |= BH_TRANSMIT;
1976                                         return;
1977                                 }
1978                         } else {
1979                                 if (!(info->signals & SerialSignal_CTS))
1980                                         info->tty->hw_stopped = 1;
1981                         }
1982                 }
1983         }
1984 }
1985
1986 static void dcd_change(struct slgt_info *info)
1987 {
1988         get_signals(info);
1989         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
1990         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1991                 slgt_irq_off(info, IRQ_DCD);
1992                 return;
1993         }
1994         info->icount.dcd++;
1995         if (info->signals & SerialSignal_DCD) {
1996                 info->input_signal_events.dcd_up++;
1997         } else {
1998                 info->input_signal_events.dcd_down++;
1999         }
2000 #ifdef CONFIG_HDLC
2001         if (info->netcount)
2002                 hdlc_set_carrier(info->signals & SerialSignal_DCD, info->netdev);
2003 #endif
2004         wake_up_interruptible(&info->status_event_wait_q);
2005         wake_up_interruptible(&info->event_wait_q);
2006         info->pending_bh |= BH_STATUS;
2007
2008         if (info->flags & ASYNC_CHECK_CD) {
2009                 if (info->signals & SerialSignal_DCD)
2010                         wake_up_interruptible(&info->open_wait);
2011                 else {
2012                         if (info->tty)
2013                                 tty_hangup(info->tty);
2014                 }
2015         }
2016 }
2017
2018 static void ri_change(struct slgt_info *info)
2019 {
2020         get_signals(info);
2021         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2022         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2023                 slgt_irq_off(info, IRQ_RI);
2024                 return;
2025         }
2026         info->icount.dcd++;
2027         if (info->signals & SerialSignal_RI) {
2028                 info->input_signal_events.ri_up++;
2029         } else {
2030                 info->input_signal_events.ri_down++;
2031         }
2032         wake_up_interruptible(&info->status_event_wait_q);
2033         wake_up_interruptible(&info->event_wait_q);
2034         info->pending_bh |= BH_STATUS;
2035 }
2036
2037 static void isr_serial(struct slgt_info *info)
2038 {
2039         unsigned short status = rd_reg16(info, SSR);
2040
2041         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2042
2043         wr_reg16(info, SSR, status); /* clear pending */
2044
2045         info->irq_occurred = 1;
2046
2047         if (info->params.mode == MGSL_MODE_ASYNC) {
2048                 if (status & IRQ_TXIDLE) {
2049                         if (info->tx_count)
2050                                 isr_txeom(info, status);
2051                 }
2052                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2053                         info->icount.brk++;
2054                         /* process break detection if tty control allows */
2055                         if (info->tty) {
2056                                 if (!(status & info->ignore_status_mask)) {
2057                                         if (info->read_status_mask & MASK_BREAK) {
2058                                                 tty_insert_flip_char(info->tty, 0, TTY_BREAK);
2059                                                 if (info->flags & ASYNC_SAK)
2060                                                         do_SAK(info->tty);
2061                                         }
2062                                 }
2063                         }
2064                 }
2065         } else {
2066                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2067                         isr_txeom(info, status);
2068
2069                 if (status & IRQ_RXIDLE) {
2070                         if (status & RXIDLE)
2071                                 info->icount.rxidle++;
2072                         else
2073                                 info->icount.exithunt++;
2074                         wake_up_interruptible(&info->event_wait_q);
2075                 }
2076
2077                 if (status & IRQ_RXOVER)
2078                         rx_start(info);
2079         }
2080
2081         if (status & IRQ_DSR)
2082                 dsr_change(info);
2083         if (status & IRQ_CTS)
2084                 cts_change(info);
2085         if (status & IRQ_DCD)
2086                 dcd_change(info);
2087         if (status & IRQ_RI)
2088                 ri_change(info);
2089 }
2090
2091 static void isr_rdma(struct slgt_info *info)
2092 {
2093         unsigned int status = rd_reg32(info, RDCSR);
2094
2095         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2096
2097         /* RDCSR (rx DMA control/status)
2098          *
2099          * 31..07  reserved
2100          * 06      save status byte to DMA buffer
2101          * 05      error
2102          * 04      eol (end of list)
2103          * 03      eob (end of buffer)
2104          * 02      IRQ enable
2105          * 01      reset
2106          * 00      enable
2107          */
2108         wr_reg32(info, RDCSR, status);  /* clear pending */
2109
2110         if (status & (BIT5 + BIT4)) {
2111                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2112                 info->rx_restart = 1;
2113         }
2114         info->pending_bh |= BH_RECEIVE;
2115 }
2116
2117 static void isr_tdma(struct slgt_info *info)
2118 {
2119         unsigned int status = rd_reg32(info, TDCSR);
2120
2121         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2122
2123         /* TDCSR (tx DMA control/status)
2124          *
2125          * 31..06  reserved
2126          * 05      error
2127          * 04      eol (end of list)
2128          * 03      eob (end of buffer)
2129          * 02      IRQ enable
2130          * 01      reset
2131          * 00      enable
2132          */
2133         wr_reg32(info, TDCSR, status);  /* clear pending */
2134
2135         if (status & (BIT5 + BIT4 + BIT3)) {
2136                 // another transmit buffer has completed
2137                 // run bottom half to get more send data from user
2138                 info->pending_bh |= BH_TRANSMIT;
2139         }
2140 }
2141
2142 static void isr_txeom(struct slgt_info *info, unsigned short status)
2143 {
2144         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2145
2146         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2147         tdma_reset(info);
2148         reset_tbufs(info);
2149         if (status & IRQ_TXUNDER) {
2150                 unsigned short val = rd_reg16(info, TCR);
2151                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2152                 wr_reg16(info, TCR, val); /* clear reset bit */
2153         }
2154
2155         if (info->tx_active) {
2156                 if (info->params.mode != MGSL_MODE_ASYNC) {
2157                         if (status & IRQ_TXUNDER)
2158                                 info->icount.txunder++;
2159                         else if (status & IRQ_TXIDLE)
2160                                 info->icount.txok++;
2161                 }
2162
2163                 info->tx_active = 0;
2164                 info->tx_count = 0;
2165
2166                 del_timer(&info->tx_timer);
2167
2168                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2169                         info->signals &= ~SerialSignal_RTS;
2170                         info->drop_rts_on_tx_done = 0;
2171                         set_signals(info);
2172                 }
2173
2174 #ifdef CONFIG_HDLC
2175                 if (info->netcount)
2176                         hdlcdev_tx_done(info);
2177                 else
2178 #endif
2179                 {
2180                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2181                                 tx_stop(info);
2182                                 return;
2183                         }
2184                         info->pending_bh |= BH_TRANSMIT;
2185                 }
2186         }
2187 }
2188
2189 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2190 {
2191         struct cond_wait *w, *prev;
2192
2193         /* wake processes waiting for specific transitions */
2194         for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2195                 if (w->data & changed) {
2196                         w->data = state;
2197                         wake_up_interruptible(&w->q);
2198                         if (prev != NULL)
2199                                 prev->next = w->next;
2200                         else
2201                                 info->gpio_wait_q = w->next;
2202                 } else
2203                         prev = w;
2204         }
2205 }
2206
2207 /* interrupt service routine
2208  *
2209  *      irq     interrupt number
2210  *      dev_id  device ID supplied during interrupt registration
2211  *      regs    interrupted processor context
2212  */
2213 static irqreturn_t slgt_interrupt(int irq, void *dev_id, struct pt_regs * regs)
2214 {
2215         struct slgt_info *info;
2216         unsigned int gsr;
2217         unsigned int i;
2218
2219         DBGISR(("slgt_interrupt irq=%d entry\n", irq));
2220
2221         info = dev_id;
2222         if (!info)
2223                 return IRQ_NONE;
2224
2225         spin_lock(&info->lock);
2226
2227         while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2228                 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2229                 info->irq_occurred = 1;
2230                 for(i=0; i < info->port_count ; i++) {
2231                         if (info->port_array[i] == NULL)
2232                                 continue;
2233                         if (gsr & (BIT8 << i))
2234                                 isr_serial(info->port_array[i]);
2235                         if (gsr & (BIT16 << (i*2)))
2236                                 isr_rdma(info->port_array[i]);
2237                         if (gsr & (BIT17 << (i*2)))
2238                                 isr_tdma(info->port_array[i]);
2239                 }
2240         }
2241
2242         if (info->gpio_present) {
2243                 unsigned int state;
2244                 unsigned int changed;
2245                 while ((changed = rd_reg32(info, IOSR)) != 0) {
2246                         DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2247                         /* read latched state of GPIO signals */
2248                         state = rd_reg32(info, IOVR);
2249                         /* clear pending GPIO interrupt bits */
2250                         wr_reg32(info, IOSR, changed);
2251                         for (i=0 ; i < info->port_count ; i++) {
2252                                 if (info->port_array[i] != NULL)
2253                                         isr_gpio(info->port_array[i], changed, state);
2254                         }
2255                 }
2256         }
2257
2258         for(i=0; i < info->port_count ; i++) {
2259                 struct slgt_info *port = info->port_array[i];
2260
2261                 if (port && (port->count || port->netcount) &&
2262                     port->pending_bh && !port->bh_running &&
2263                     !port->bh_requested) {
2264                         DBGISR(("%s bh queued\n", port->device_name));
2265                         schedule_work(&port->task);
2266                         port->bh_requested = 1;
2267                 }
2268         }
2269
2270         spin_unlock(&info->lock);
2271
2272         DBGISR(("slgt_interrupt irq=%d exit\n", irq));
2273         return IRQ_HANDLED;
2274 }
2275
2276 static int startup(struct slgt_info *info)
2277 {
2278         DBGINFO(("%s startup\n", info->device_name));
2279
2280         if (info->flags & ASYNC_INITIALIZED)
2281                 return 0;
2282
2283         if (!info->tx_buf) {
2284                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2285                 if (!info->tx_buf) {
2286                         DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2287                         return -ENOMEM;
2288                 }
2289         }
2290
2291         info->pending_bh = 0;
2292
2293         memset(&info->icount, 0, sizeof(info->icount));
2294
2295         /* program hardware for current parameters */
2296         change_params(info);
2297
2298         if (info->tty)
2299                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2300
2301         info->flags |= ASYNC_INITIALIZED;
2302
2303         return 0;
2304 }
2305
2306 /*
2307  *  called by close() and hangup() to shutdown hardware
2308  */
2309 static void shutdown(struct slgt_info *info)
2310 {
2311         unsigned long flags;
2312
2313         if (!(info->flags & ASYNC_INITIALIZED))
2314                 return;
2315
2316         DBGINFO(("%s shutdown\n", info->device_name));
2317
2318         /* clear status wait queue because status changes */
2319         /* can't happen after shutting down the hardware */
2320         wake_up_interruptible(&info->status_event_wait_q);
2321         wake_up_interruptible(&info->event_wait_q);
2322
2323         del_timer_sync(&info->tx_timer);
2324         del_timer_sync(&info->rx_timer);
2325
2326         kfree(info->tx_buf);
2327         info->tx_buf = NULL;
2328
2329         spin_lock_irqsave(&info->lock,flags);
2330
2331         tx_stop(info);
2332         rx_stop(info);
2333
2334         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2335
2336         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2337                 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2338                 set_signals(info);
2339         }
2340
2341         flush_cond_wait(&info->gpio_wait_q);
2342
2343         spin_unlock_irqrestore(&info->lock,flags);
2344
2345         if (info->tty)
2346                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2347
2348         info->flags &= ~ASYNC_INITIALIZED;
2349 }
2350
2351 static void program_hw(struct slgt_info *info)
2352 {
2353         unsigned long flags;
2354
2355         spin_lock_irqsave(&info->lock,flags);
2356
2357         rx_stop(info);
2358         tx_stop(info);
2359
2360         if (info->params.mode == MGSL_MODE_HDLC ||
2361             info->params.mode == MGSL_MODE_RAW ||
2362             info->netcount)
2363                 hdlc_mode(info);
2364         else
2365                 async_mode(info);
2366
2367         set_signals(info);
2368
2369         info->dcd_chkcount = 0;
2370         info->cts_chkcount = 0;
2371         info->ri_chkcount = 0;
2372         info->dsr_chkcount = 0;
2373
2374         slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
2375         get_signals(info);
2376
2377         if (info->netcount ||
2378             (info->tty && info->tty->termios->c_cflag & CREAD))
2379                 rx_start(info);
2380
2381         spin_unlock_irqrestore(&info->lock,flags);
2382 }
2383
2384 /*
2385  * reconfigure adapter based on new parameters
2386  */
2387 static void change_params(struct slgt_info *info)
2388 {
2389         unsigned cflag;
2390         int bits_per_char;
2391
2392         if (!info->tty || !info->tty->termios)
2393                 return;
2394         DBGINFO(("%s change_params\n", info->device_name));
2395
2396         cflag = info->tty->termios->c_cflag;
2397
2398         /* if B0 rate (hangup) specified then negate DTR and RTS */
2399         /* otherwise assert DTR and RTS */
2400         if (cflag & CBAUD)
2401                 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2402         else
2403                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2404
2405         /* byte size and parity */
2406
2407         switch (cflag & CSIZE) {
2408         case CS5: info->params.data_bits = 5; break;
2409         case CS6: info->params.data_bits = 6; break;
2410         case CS7: info->params.data_bits = 7; break;
2411         case CS8: info->params.data_bits = 8; break;
2412         default:  info->params.data_bits = 7; break;
2413         }
2414
2415         info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2416
2417         if (cflag & PARENB)
2418                 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2419         else
2420                 info->params.parity = ASYNC_PARITY_NONE;
2421
2422         /* calculate number of jiffies to transmit a full
2423          * FIFO (32 bytes) at specified data rate
2424          */
2425         bits_per_char = info->params.data_bits +
2426                         info->params.stop_bits + 1;
2427
2428         info->params.data_rate = tty_get_baud_rate(info->tty);
2429
2430         if (info->params.data_rate) {
2431                 info->timeout = (32*HZ*bits_per_char) /
2432                                 info->params.data_rate;
2433         }
2434         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2435
2436         if (cflag & CRTSCTS)
2437                 info->flags |= ASYNC_CTS_FLOW;
2438         else
2439                 info->flags &= ~ASYNC_CTS_FLOW;
2440
2441         if (cflag & CLOCAL)
2442                 info->flags &= ~ASYNC_CHECK_CD;
2443         else
2444                 info->flags |= ASYNC_CHECK_CD;
2445
2446         /* process tty input control flags */
2447
2448         info->read_status_mask = IRQ_RXOVER;
2449         if (I_INPCK(info->tty))
2450                 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2451         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2452                 info->read_status_mask |= MASK_BREAK;
2453         if (I_IGNPAR(info->tty))
2454                 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2455         if (I_IGNBRK(info->tty)) {
2456                 info->ignore_status_mask |= MASK_BREAK;
2457                 /* If ignoring parity and break indicators, ignore
2458                  * overruns too.  (For real raw support).
2459                  */
2460                 if (I_IGNPAR(info->tty))
2461                         info->ignore_status_mask |= MASK_OVERRUN;
2462         }
2463
2464         program_hw(info);
2465 }
2466
2467 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2468 {
2469         DBGINFO(("%s get_stats\n",  info->device_name));
2470         if (!user_icount) {
2471                 memset(&info->icount, 0, sizeof(info->icount));
2472         } else {
2473                 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2474                         return -EFAULT;
2475         }
2476         return 0;
2477 }
2478
2479 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2480 {
2481         DBGINFO(("%s get_params\n", info->device_name));
2482         if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2483                 return -EFAULT;
2484         return 0;
2485 }
2486
2487 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2488 {
2489         unsigned long flags;
2490         MGSL_PARAMS tmp_params;
2491
2492         DBGINFO(("%s set_params\n", info->device_name));
2493         if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2494                 return -EFAULT;
2495
2496         spin_lock_irqsave(&info->lock, flags);
2497         memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2498         spin_unlock_irqrestore(&info->lock, flags);
2499
2500         change_params(info);
2501
2502         return 0;
2503 }
2504
2505 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2506 {
2507         DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2508         if (put_user(info->idle_mode, idle_mode))
2509                 return -EFAULT;
2510         return 0;
2511 }
2512
2513 static int set_txidle(struct slgt_info *info, int idle_mode)
2514 {
2515         unsigned long flags;
2516         DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2517         spin_lock_irqsave(&info->lock,flags);
2518         info->idle_mode = idle_mode;
2519         if (info->params.mode != MGSL_MODE_ASYNC)
2520                 tx_set_idle(info);
2521         spin_unlock_irqrestore(&info->lock,flags);
2522         return 0;
2523 }
2524
2525 static int tx_enable(struct slgt_info *info, int enable)
2526 {
2527         unsigned long flags;
2528         DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2529         spin_lock_irqsave(&info->lock,flags);
2530         if (enable) {
2531                 if (!info->tx_enabled)
2532                         tx_start(info);
2533         } else {
2534                 if (info->tx_enabled)
2535                         tx_stop(info);
2536         }
2537         spin_unlock_irqrestore(&info->lock,flags);
2538         return 0;
2539 }
2540
2541 /*
2542  * abort transmit HDLC frame
2543  */
2544 static int tx_abort(struct slgt_info *info)
2545 {
2546         unsigned long flags;
2547         DBGINFO(("%s tx_abort\n", info->device_name));
2548         spin_lock_irqsave(&info->lock,flags);
2549         tdma_reset(info);
2550         spin_unlock_irqrestore(&info->lock,flags);
2551         return 0;
2552 }
2553
2554 static int rx_enable(struct slgt_info *info, int enable)
2555 {
2556         unsigned long flags;
2557         DBGINFO(("%s rx_enable(%d)\n", info->device_name, enable));
2558         spin_lock_irqsave(&info->lock,flags);
2559         if (enable) {
2560                 if (!info->rx_enabled)
2561                         rx_start(info);
2562         } else {
2563                 if (info->rx_enabled)
2564                         rx_stop(info);
2565         }
2566         spin_unlock_irqrestore(&info->lock,flags);
2567         return 0;
2568 }
2569
2570 /*
2571  *  wait for specified event to occur
2572  */
2573 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2574 {
2575         unsigned long flags;
2576         int s;
2577         int rc=0;
2578         struct mgsl_icount cprev, cnow;
2579         int events;
2580         int mask;
2581         struct  _input_signal_events oldsigs, newsigs;
2582         DECLARE_WAITQUEUE(wait, current);
2583
2584         if (get_user(mask, mask_ptr))
2585                 return -EFAULT;
2586
2587         DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2588
2589         spin_lock_irqsave(&info->lock,flags);
2590
2591         /* return immediately if state matches requested events */
2592         get_signals(info);
2593         s = info->signals;
2594
2595         events = mask &
2596                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2597                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2598                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2599                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2600         if (events) {
2601                 spin_unlock_irqrestore(&info->lock,flags);
2602                 goto exit;
2603         }
2604
2605         /* save current irq counts */
2606         cprev = info->icount;
2607         oldsigs = info->input_signal_events;
2608
2609         /* enable hunt and idle irqs if needed */
2610         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2611                 unsigned short val = rd_reg16(info, SCR);
2612                 if (!(val & IRQ_RXIDLE))
2613                         wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2614         }
2615
2616         set_current_state(TASK_INTERRUPTIBLE);
2617         add_wait_queue(&info->event_wait_q, &wait);
2618
2619         spin_unlock_irqrestore(&info->lock,flags);
2620
2621         for(;;) {
2622                 schedule();
2623                 if (signal_pending(current)) {
2624                         rc = -ERESTARTSYS;
2625                         break;
2626                 }
2627
2628                 /* get current irq counts */
2629                 spin_lock_irqsave(&info->lock,flags);
2630                 cnow = info->icount;
2631                 newsigs = info->input_signal_events;
2632                 set_current_state(TASK_INTERRUPTIBLE);
2633                 spin_unlock_irqrestore(&info->lock,flags);
2634
2635                 /* if no change, wait aborted for some reason */
2636                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2637                     newsigs.dsr_down == oldsigs.dsr_down &&
2638                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2639                     newsigs.dcd_down == oldsigs.dcd_down &&
2640                     newsigs.cts_up   == oldsigs.cts_up   &&
2641                     newsigs.cts_down == oldsigs.cts_down &&
2642                     newsigs.ri_up    == oldsigs.ri_up    &&
2643                     newsigs.ri_down  == oldsigs.ri_down  &&
2644                     cnow.exithunt    == cprev.exithunt   &&
2645                     cnow.rxidle      == cprev.rxidle) {
2646                         rc = -EIO;
2647                         break;
2648                 }
2649
2650                 events = mask &
2651                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2652                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2653                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2654                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2655                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2656                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2657                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2658                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2659                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2660                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2661                 if (events)
2662                         break;
2663
2664                 cprev = cnow;
2665                 oldsigs = newsigs;
2666         }
2667
2668         remove_wait_queue(&info->event_wait_q, &wait);
2669         set_current_state(TASK_RUNNING);
2670
2671
2672         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2673                 spin_lock_irqsave(&info->lock,flags);
2674                 if (!waitqueue_active(&info->event_wait_q)) {
2675                         /* disable enable exit hunt mode/idle rcvd IRQs */
2676                         wr_reg16(info, SCR,
2677                                 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2678                 }
2679                 spin_unlock_irqrestore(&info->lock,flags);
2680         }
2681 exit:
2682         if (rc == 0)
2683                 rc = put_user(events, mask_ptr);
2684         return rc;
2685 }
2686
2687 static int get_interface(struct slgt_info *info, int __user *if_mode)
2688 {
2689         DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2690         if (put_user(info->if_mode, if_mode))
2691                 return -EFAULT;
2692         return 0;
2693 }
2694
2695 static int set_interface(struct slgt_info *info, int if_mode)
2696 {
2697         unsigned long flags;
2698         unsigned short val;
2699
2700         DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2701         spin_lock_irqsave(&info->lock,flags);
2702         info->if_mode = if_mode;
2703
2704         msc_set_vcr(info);
2705
2706         /* TCR (tx control) 07  1=RTS driver control */
2707         val = rd_reg16(info, TCR);
2708         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2709                 val |= BIT7;
2710         else
2711                 val &= ~BIT7;
2712         wr_reg16(info, TCR, val);
2713
2714         spin_unlock_irqrestore(&info->lock,flags);
2715         return 0;
2716 }
2717
2718 /*
2719  * set general purpose IO pin state and direction
2720  *
2721  * user_gpio fields:
2722  * state   each bit indicates a pin state
2723  * smask   set bit indicates pin state to set
2724  * dir     each bit indicates a pin direction (0=input, 1=output)
2725  * dmask   set bit indicates pin direction to set
2726  */
2727 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2728 {
2729         unsigned long flags;
2730         struct gpio_desc gpio;
2731         __u32 data;
2732
2733         if (!info->gpio_present)
2734                 return -EINVAL;
2735         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2736                 return -EFAULT;
2737         DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2738                  info->device_name, gpio.state, gpio.smask,
2739                  gpio.dir, gpio.dmask));
2740
2741         spin_lock_irqsave(&info->lock,flags);
2742         if (gpio.dmask) {
2743                 data = rd_reg32(info, IODR);
2744                 data |= gpio.dmask & gpio.dir;
2745                 data &= ~(gpio.dmask & ~gpio.dir);
2746                 wr_reg32(info, IODR, data);
2747         }
2748         if (gpio.smask) {
2749                 data = rd_reg32(info, IOVR);
2750                 data |= gpio.smask & gpio.state;
2751                 data &= ~(gpio.smask & ~gpio.state);
2752                 wr_reg32(info, IOVR, data);
2753         }
2754         spin_unlock_irqrestore(&info->lock,flags);
2755
2756         return 0;
2757 }
2758
2759 /*
2760  * get general purpose IO pin state and direction
2761  */
2762 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2763 {
2764         struct gpio_desc gpio;
2765         if (!info->gpio_present)
2766                 return -EINVAL;
2767         gpio.state = rd_reg32(info, IOVR);
2768         gpio.smask = 0xffffffff;
2769         gpio.dir   = rd_reg32(info, IODR);
2770         gpio.dmask = 0xffffffff;
2771         if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2772                 return -EFAULT;
2773         DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2774                  info->device_name, gpio.state, gpio.dir));
2775         return 0;
2776 }
2777
2778 /*
2779  * conditional wait facility
2780  */
2781 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2782 {
2783         init_waitqueue_head(&w->q);
2784         init_waitqueue_entry(&w->wait, current);
2785         w->data = data;
2786 }
2787
2788 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2789 {
2790         set_current_state(TASK_INTERRUPTIBLE);
2791         add_wait_queue(&w->q, &w->wait);
2792         w->next = *head;
2793         *head = w;
2794 }
2795
2796 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2797 {
2798         struct cond_wait *w, *prev;
2799         remove_wait_queue(&cw->q, &cw->wait);
2800         set_current_state(TASK_RUNNING);
2801         for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2802                 if (w == cw) {
2803                         if (prev != NULL)
2804                                 prev->next = w->next;
2805                         else
2806                                 *head = w->next;
2807                         break;
2808                 }
2809         }
2810 }
2811
2812 static void flush_cond_wait(struct cond_wait **head)
2813 {
2814         while (*head != NULL) {
2815                 wake_up_interruptible(&(*head)->q);
2816                 *head = (*head)->next;
2817         }
2818 }
2819
2820 /*
2821  * wait for general purpose I/O pin(s) to enter specified state
2822  *
2823  * user_gpio fields:
2824  * state - bit indicates target pin state
2825  * smask - set bit indicates watched pin
2826  *
2827  * The wait ends when at least one watched pin enters the specified
2828  * state. When 0 (no error) is returned, user_gpio->state is set to the
2829  * state of all GPIO pins when the wait ends.
2830  *
2831  * Note: Each pin may be a dedicated input, dedicated output, or
2832  * configurable input/output. The number and configuration of pins
2833  * varies with the specific adapter model. Only input pins (dedicated
2834  * or configured) can be monitored with this function.
2835  */
2836 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2837 {
2838         unsigned long flags;
2839         int rc = 0;
2840         struct gpio_desc gpio;
2841         struct cond_wait wait;
2842         u32 state;
2843
2844         if (!info->gpio_present)
2845                 return -EINVAL;
2846         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2847                 return -EFAULT;
2848         DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2849                  info->device_name, gpio.state, gpio.smask));
2850         /* ignore output pins identified by set IODR bit */
2851         if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2852                 return -EINVAL;
2853         init_cond_wait(&wait, gpio.smask);
2854
2855         spin_lock_irqsave(&info->lock, flags);
2856         /* enable interrupts for watched pins */
2857         wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
2858         /* get current pin states */
2859         state = rd_reg32(info, IOVR);
2860
2861         if (gpio.smask & ~(state ^ gpio.state)) {
2862                 /* already in target state */
2863                 gpio.state = state;
2864         } else {
2865                 /* wait for target state */
2866                 add_cond_wait(&info->gpio_wait_q, &wait);
2867                 spin_unlock_irqrestore(&info->lock, flags);
2868                 schedule();
2869                 if (signal_pending(current))
2870                         rc = -ERESTARTSYS;
2871                 else
2872                         gpio.state = wait.data;
2873                 spin_lock_irqsave(&info->lock, flags);
2874                 remove_cond_wait(&info->gpio_wait_q, &wait);
2875         }
2876
2877         /* disable all GPIO interrupts if no waiting processes */
2878         if (info->gpio_wait_q == NULL)
2879                 wr_reg32(info, IOER, 0);
2880         spin_unlock_irqrestore(&info->lock,flags);
2881
2882         if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2883                 rc = -EFAULT;
2884         return rc;
2885 }
2886
2887 static int modem_input_wait(struct slgt_info *info,int arg)
2888 {
2889         unsigned long flags;
2890         int rc;
2891         struct mgsl_icount cprev, cnow;
2892         DECLARE_WAITQUEUE(wait, current);
2893
2894         /* save current irq counts */
2895         spin_lock_irqsave(&info->lock,flags);
2896         cprev = info->icount;
2897         add_wait_queue(&info->status_event_wait_q, &wait);
2898         set_current_state(TASK_INTERRUPTIBLE);
2899         spin_unlock_irqrestore(&info->lock,flags);
2900
2901         for(;;) {
2902                 schedule();
2903                 if (signal_pending(current)) {
2904                         rc = -ERESTARTSYS;
2905                         break;
2906                 }
2907
2908                 /* get new irq counts */
2909                 spin_lock_irqsave(&info->lock,flags);
2910                 cnow = info->icount;
2911                 set_current_state(TASK_INTERRUPTIBLE);
2912                 spin_unlock_irqrestore(&info->lock,flags);
2913
2914                 /* if no change, wait aborted for some reason */
2915                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2916                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2917                         rc = -EIO;
2918                         break;
2919                 }
2920
2921                 /* check for change in caller specified modem input */
2922                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2923                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2924                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2925                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2926                         rc = 0;
2927                         break;
2928                 }
2929
2930                 cprev = cnow;
2931         }
2932         remove_wait_queue(&info->status_event_wait_q, &wait);
2933         set_current_state(TASK_RUNNING);
2934         return rc;
2935 }
2936
2937 /*
2938  *  return state of serial control and status signals
2939  */
2940 static int tiocmget(struct tty_struct *tty, struct file *file)
2941 {
2942         struct slgt_info *info = tty->driver_data;
2943         unsigned int result;
2944         unsigned long flags;
2945
2946         spin_lock_irqsave(&info->lock,flags);
2947         get_signals(info);
2948         spin_unlock_irqrestore(&info->lock,flags);
2949
2950         result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2951                 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2952                 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2953                 ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2954                 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2955                 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2956
2957         DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
2958         return result;
2959 }
2960
2961 /*
2962  * set modem control signals (DTR/RTS)
2963  *
2964  *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
2965  *              TIOCMSET = set/clear signal values
2966  *      value   bit mask for command
2967  */
2968 static int tiocmset(struct tty_struct *tty, struct file *file,
2969                     unsigned int set, unsigned int clear)
2970 {
2971         struct slgt_info *info = tty->driver_data;
2972         unsigned long flags;
2973
2974         DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
2975
2976         if (set & TIOCM_RTS)
2977                 info->signals |= SerialSignal_RTS;
2978         if (set & TIOCM_DTR)
2979                 info->signals |= SerialSignal_DTR;
2980         if (clear & TIOCM_RTS)
2981                 info->signals &= ~SerialSignal_RTS;
2982         if (clear & TIOCM_DTR)
2983                 info->signals &= ~SerialSignal_DTR;
2984
2985         spin_lock_irqsave(&info->lock,flags);
2986         set_signals(info);
2987         spin_unlock_irqrestore(&info->lock,flags);
2988         return 0;
2989 }
2990
2991 /*
2992  *  block current process until the device is ready to open
2993  */
2994 static int block_til_ready(struct tty_struct *tty, struct file *filp,
2995                            struct slgt_info *info)
2996 {
2997         DECLARE_WAITQUEUE(wait, current);
2998         int             retval;
2999         int             do_clocal = 0, extra_count = 0;
3000         unsigned long   flags;
3001
3002         DBGINFO(("%s block_til_ready\n", tty->driver->name));
3003
3004         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3005                 /* nonblock mode is set or port is not enabled */
3006                 info->flags |= ASYNC_NORMAL_ACTIVE;
3007                 return 0;
3008         }
3009
3010         if (tty->termios->c_cflag & CLOCAL)
3011                 do_clocal = 1;
3012
3013         /* Wait for carrier detect and the line to become
3014          * free (i.e., not in use by the callout).  While we are in
3015          * this loop, info->count is dropped by one, so that
3016          * close() knows when to free things.  We restore it upon
3017          * exit, either normal or abnormal.
3018          */
3019
3020         retval = 0;
3021         add_wait_queue(&info->open_wait, &wait);
3022
3023         spin_lock_irqsave(&info->lock, flags);
3024         if (!tty_hung_up_p(filp)) {
3025                 extra_count = 1;
3026                 info->count--;
3027         }
3028         spin_unlock_irqrestore(&info->lock, flags);
3029         info->blocked_open++;
3030
3031         while (1) {
3032                 if ((tty->termios->c_cflag & CBAUD)) {
3033                         spin_lock_irqsave(&info->lock,flags);
3034                         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3035                         set_signals(info);
3036                         spin_unlock_irqrestore(&info->lock,flags);
3037                 }
3038
3039                 set_current_state(TASK_INTERRUPTIBLE);
3040
3041                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3042                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3043                                         -EAGAIN : -ERESTARTSYS;
3044                         break;
3045                 }
3046
3047                 spin_lock_irqsave(&info->lock,flags);
3048                 get_signals(info);
3049                 spin_unlock_irqrestore(&info->lock,flags);
3050
3051                 if (!(info->flags & ASYNC_CLOSING) &&
3052                     (do_clocal || (info->signals & SerialSignal_DCD)) ) {
3053                         break;
3054                 }
3055
3056                 if (signal_pending(current)) {
3057                         retval = -ERESTARTSYS;
3058                         break;
3059                 }
3060
3061                 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3062                 schedule();
3063         }
3064
3065         set_current_state(TASK_RUNNING);
3066         remove_wait_queue(&info->open_wait, &wait);
3067
3068         if (extra_count)
3069                 info->count++;
3070         info->blocked_open--;
3071
3072         if (!retval)
3073                 info->flags |= ASYNC_NORMAL_ACTIVE;
3074
3075         DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3076         return retval;
3077 }
3078
3079 static int alloc_tmp_rbuf(struct slgt_info *info)
3080 {
3081         info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3082         if (info->tmp_rbuf == NULL)
3083                 return -ENOMEM;
3084         return 0;
3085 }
3086
3087 static void free_tmp_rbuf(struct slgt_info *info)
3088 {
3089         kfree(info->tmp_rbuf);
3090         info->tmp_rbuf = NULL;
3091 }
3092
3093 /*
3094  * allocate DMA descriptor lists.
3095  */
3096 static int alloc_desc(struct slgt_info *info)
3097 {
3098         unsigned int i;
3099         unsigned int pbufs;
3100
3101         /* allocate memory to hold descriptor lists */
3102         info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3103         if (info->bufs == NULL)
3104                 return -ENOMEM;
3105
3106         memset(info->bufs, 0, DESC_LIST_SIZE);
3107
3108         info->rbufs = (struct slgt_desc*)info->bufs;
3109         info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3110
3111         pbufs = (unsigned int)info->bufs_dma_addr;
3112
3113         /*
3114          * Build circular lists of descriptors
3115          */
3116
3117         for (i=0; i < info->rbuf_count; i++) {
3118                 /* physical address of this descriptor */
3119                 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3120
3121                 /* physical address of next descriptor */
3122                 if (i == info->rbuf_count - 1)
3123                         info->rbufs[i].next = cpu_to_le32(pbufs);
3124                 else
3125                         info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3126                 set_desc_count(info->rbufs[i], DMABUFSIZE);
3127         }
3128
3129         for (i=0; i < info->tbuf_count; i++) {
3130                 /* physical address of this descriptor */
3131                 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3132
3133                 /* physical address of next descriptor */
3134                 if (i == info->tbuf_count - 1)
3135                         info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3136                 else
3137                         info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3138         }
3139
3140         return 0;
3141 }
3142
3143 static void free_desc(struct slgt_info *info)
3144 {
3145         if (info->bufs != NULL) {
3146                 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3147                 info->bufs  = NULL;
3148                 info->rbufs = NULL;
3149                 info->tbufs = NULL;
3150         }
3151 }
3152
3153 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3154 {
3155         int i;
3156         for (i=0; i < count; i++) {
3157                 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3158                         return -ENOMEM;
3159                 bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3160         }
3161         return 0;
3162 }
3163
3164 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3165 {
3166         int i;
3167         for (i=0; i < count; i++) {
3168                 if (bufs[i].buf == NULL)
3169                         continue;
3170                 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3171                 bufs[i].buf = NULL;
3172         }
3173 }
3174
3175 static int alloc_dma_bufs(struct slgt_info *info)
3176 {
3177         info->rbuf_count = 32;
3178         info->tbuf_count = 32;
3179
3180         if (alloc_desc(info) < 0 ||
3181             alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3182             alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3183             alloc_tmp_rbuf(info) < 0) {
3184                 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3185                 return -ENOMEM;
3186         }
3187         reset_rbufs(info);
3188         return 0;
3189 }
3190
3191 static void free_dma_bufs(struct slgt_info *info)
3192 {
3193         if (info->bufs) {
3194                 free_bufs(info, info->rbufs, info->rbuf_count);
3195                 free_bufs(info, info->tbufs, info->tbuf_count);
3196                 free_desc(info);
3197         }
3198         free_tmp_rbuf(info);
3199 }
3200
3201 static int claim_resources(struct slgt_info *info)
3202 {
3203         if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3204                 DBGERR(("%s reg addr conflict, addr=%08X\n",
3205                         info->device_name, info->phys_reg_addr));
3206                 info->init_error = DiagStatus_AddressConflict;
3207                 goto errout;
3208         }
3209         else
3210                 info->reg_addr_requested = 1;
3211
3212         info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE);
3213         if (!info->reg_addr) {
3214                 DBGERR(("%s cant map device registers, addr=%08X\n",
3215                         info->device_name, info->phys_reg_addr));
3216                 info->init_error = DiagStatus_CantAssignPciResources;
3217                 goto errout;
3218         }
3219         return 0;
3220
3221 errout:
3222         release_resources(info);
3223         return -ENODEV;
3224 }
3225
3226 static void release_resources(struct slgt_info *info)
3227 {
3228         if (info->irq_requested) {
3229                 free_irq(info->irq_level, info);
3230                 info->irq_requested = 0;
3231         }
3232
3233         if (info->reg_addr_requested) {
3234                 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3235                 info->reg_addr_requested = 0;
3236         }
3237
3238         if (info->reg_addr) {
3239                 iounmap(info->reg_addr);
3240                 info->reg_addr = NULL;
3241         }
3242 }
3243
3244 /* Add the specified device instance data structure to the
3245  * global linked list of devices and increment the device count.
3246  */
3247 static void add_device(struct slgt_info *info)
3248 {
3249         char *devstr;
3250
3251         info->next_device = NULL;
3252         info->line = slgt_device_count;
3253         sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3254
3255         if (info->line < MAX_DEVICES) {
3256                 if (maxframe[info->line])
3257                         info->max_frame_size = maxframe[info->line];
3258                 info->dosyncppp = dosyncppp[info->line];
3259         }
3260
3261         slgt_device_count++;
3262
3263         if (!slgt_device_list)
3264                 slgt_device_list = info;
3265         else {
3266                 struct slgt_info *current_dev = slgt_device_list;
3267                 while(current_dev->next_device)
3268                         current_dev = current_dev->next_device;
3269                 current_dev->next_device = info;
3270         }
3271
3272         if (info->max_frame_size < 4096)
3273                 info->max_frame_size = 4096;
3274         else if (info->max_frame_size > 65535)
3275                 info->max_frame_size = 65535;
3276
3277         switch(info->pdev->device) {
3278         case SYNCLINK_GT_DEVICE_ID:
3279                 devstr = "GT";
3280                 break;
3281         case SYNCLINK_GT2_DEVICE_ID:
3282                 devstr = "GT2";
3283                 break;
3284         case SYNCLINK_GT4_DEVICE_ID:
3285                 devstr = "GT4";
3286                 break;
3287         case SYNCLINK_AC_DEVICE_ID:
3288                 devstr = "AC";
3289                 info->params.mode = MGSL_MODE_ASYNC;
3290                 break;
3291         default:
3292                 devstr = "(unknown model)";
3293         }
3294         printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3295                 devstr, info->device_name, info->phys_reg_addr,
3296                 info->irq_level, info->max_frame_size);
3297
3298 #ifdef CONFIG_HDLC
3299         hdlcdev_init(info);
3300 #endif
3301 }
3302
3303 /*
3304  *  allocate device instance structure, return NULL on failure
3305  */
3306 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3307 {
3308         struct slgt_info *info;
3309
3310         info = kmalloc(sizeof(struct slgt_info), GFP_KERNEL);
3311
3312         if (!info) {
3313                 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3314                         driver_name, adapter_num, port_num));
3315         } else {
3316                 memset(info, 0, sizeof(struct slgt_info));
3317                 info->magic = MGSL_MAGIC;
3318                 INIT_WORK(&info->task, bh_handler, info);
3319                 info->max_frame_size = 4096;
3320                 info->raw_rx_size = DMABUFSIZE;
3321                 info->close_delay = 5*HZ/10;
3322                 info->closing_wait = 30*HZ;
3323                 init_waitqueue_head(&info->open_wait);
3324                 init_waitqueue_head(&info->close_wait);
3325                 init_waitqueue_head(&info->status_event_wait_q);
3326                 init_waitqueue_head(&info->event_wait_q);
3327                 spin_lock_init(&info->netlock);
3328                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3329                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3330                 info->adapter_num = adapter_num;
3331                 info->port_num = port_num;
3332
3333                 init_timer(&info->tx_timer);
3334                 info->tx_timer.data = (unsigned long)info;
3335                 info->tx_timer.function = tx_timeout;
3336
3337                 init_timer(&info->rx_timer);
3338                 info->rx_timer.data = (unsigned long)info;
3339                 info->rx_timer.function = rx_timeout;
3340
3341                 /* Copy configuration info to device instance data */
3342                 info->pdev = pdev;
3343                 info->irq_level = pdev->irq;
3344                 info->phys_reg_addr = pci_resource_start(pdev,0);
3345
3346                 info->bus_type = MGSL_BUS_TYPE_PCI;
3347                 info->irq_flags = SA_SHIRQ;
3348
3349                 info->init_error = -1; /* assume error, set to 0 on successful init */
3350         }
3351
3352         return info;
3353 }
3354
3355 static void device_init(int adapter_num, struct pci_dev *pdev)
3356 {
3357         struct slgt_info *port_array[SLGT_MAX_PORTS];
3358         int i;
3359         int port_count = 1;
3360
3361         if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3362                 port_count = 2;
3363         else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3364                 port_count = 4;
3365
3366         /* allocate device instances for all ports */
3367         for (i=0; i < port_count; ++i) {
3368                 port_array[i] = alloc_dev(adapter_num, i, pdev);
3369                 if (port_array[i] == NULL) {
3370                         for (--i; i >= 0; --i)
3371                                 kfree(port_array[i]);
3372                         return;
3373                 }
3374         }
3375
3376         /* give copy of port_array to all ports and add to device list  */
3377         for (i=0; i < port_count; ++i) {
3378                 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3379                 add_device(port_array[i]);
3380                 port_array[i]->port_count = port_count;
3381                 spin_lock_init(&port_array[i]->lock);
3382         }
3383
3384         /* Allocate and claim adapter resources */
3385         if (!claim_resources(port_array[0])) {
3386
3387                 alloc_dma_bufs(port_array[0]);
3388
3389                 /* copy resource information from first port to others */
3390                 for (i = 1; i < port_count; ++i) {
3391                         port_array[i]->lock      = port_array[0]->lock;
3392                         port_array[i]->irq_level = port_array[0]->irq_level;
3393                         port_array[i]->reg_addr  = port_array[0]->reg_addr;
3394                         alloc_dma_bufs(port_array[i]);
3395                 }
3396
3397                 if (request_irq(port_array[0]->irq_level,
3398                                         slgt_interrupt,
3399                                         port_array[0]->irq_flags,
3400                                         port_array[0]->device_name,
3401                                         port_array[0]) < 0) {
3402                         DBGERR(("%s request_irq failed IRQ=%d\n",
3403                                 port_array[0]->device_name,
3404                                 port_array[0]->irq_level));
3405                 } else {
3406                         port_array[0]->irq_requested = 1;
3407                         adapter_test(port_array[0]);
3408                         for (i=1 ; i < port_count ; i++) {
3409                                 port_array[i]->init_error = port_array[0]->init_error;
3410                                 port_array[i]->gpio_present = port_array[0]->gpio_present;
3411                         }
3412                 }
3413         }
3414 }
3415
3416 static int __devinit init_one(struct pci_dev *dev,
3417                               const struct pci_device_id *ent)
3418 {
3419         if (pci_enable_device(dev)) {
3420                 printk("error enabling pci device %p\n", dev);
3421                 return -EIO;
3422         }
3423         pci_set_master(dev);
3424         device_init(slgt_device_count, dev);
3425         return 0;
3426 }
3427
3428 static void __devexit remove_one(struct pci_dev *dev)
3429 {
3430 }
3431
3432 static struct tty_operations ops = {
3433         .open = open,
3434         .close = close,
3435         .write = write,
3436         .put_char = put_char,
3437         .flush_chars = flush_chars,
3438         .write_room = write_room,
3439         .chars_in_buffer = chars_in_buffer,
3440         .flush_buffer = flush_buffer,
3441         .ioctl = ioctl,
3442         .throttle = throttle,
3443         .unthrottle = unthrottle,
3444         .send_xchar = send_xchar,
3445         .break_ctl = set_break,
3446         .wait_until_sent = wait_until_sent,
3447         .read_proc = read_proc,
3448         .set_termios = set_termios,
3449         .stop = tx_hold,
3450         .start = tx_release,
3451         .hangup = hangup,
3452         .tiocmget = tiocmget,
3453         .tiocmset = tiocmset,
3454 };
3455
3456 static void slgt_cleanup(void)
3457 {
3458         int rc;
3459         struct slgt_info *info;
3460         struct slgt_info *tmp;
3461
3462         printk("unload %s %s\n", driver_name, driver_version);
3463
3464         if (serial_driver) {
3465                 if ((rc = tty_unregister_driver(serial_driver)))
3466                         DBGERR(("tty_unregister_driver error=%d\n", rc));
3467                 put_tty_driver(serial_driver);
3468         }
3469
3470         /* reset devices */
3471         info = slgt_device_list;
3472         while(info) {
3473                 reset_port(info);
3474                 info = info->next_device;
3475         }
3476
3477         /* release devices */
3478         info = slgt_device_list;
3479         while(info) {
3480 #ifdef CONFIG_HDLC
3481                 hdlcdev_exit(info);
3482 #endif
3483                 free_dma_bufs(info);
3484                 free_tmp_rbuf(info);
3485                 if (info->port_num == 0)
3486                         release_resources(info);
3487                 tmp = info;
3488                 info = info->next_device;
3489                 kfree(tmp);
3490         }
3491
3492         if (pci_registered)
3493                 pci_unregister_driver(&pci_driver);
3494 }
3495
3496 /*
3497  *  Driver initialization entry point.
3498  */
3499 static int __init slgt_init(void)
3500 {
3501         int rc;
3502
3503         printk("%s %s\n", driver_name, driver_version);
3504
3505         slgt_device_count = 0;
3506         if ((rc = pci_register_driver(&pci_driver)) < 0) {
3507                 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3508                 return rc;
3509         }
3510         pci_registered = 1;
3511
3512         if (!slgt_device_list) {
3513                 printk("%s no devices found\n",driver_name);
3514                 return -ENODEV;
3515         }
3516
3517         serial_driver = alloc_tty_driver(MAX_DEVICES);
3518         if (!serial_driver) {
3519                 rc = -ENOMEM;
3520                 goto error;
3521         }
3522
3523         /* Initialize the tty_driver structure */
3524
3525         serial_driver->owner = THIS_MODULE;
3526         serial_driver->driver_name = tty_driver_name;
3527         serial_driver->name = tty_dev_prefix;
3528         serial_driver->major = ttymajor;
3529         serial_driver->minor_start = 64;
3530         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3531         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3532         serial_driver->init_termios = tty_std_termios;
3533         serial_driver->init_termios.c_cflag =
3534                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3535         serial_driver->flags = TTY_DRIVER_REAL_RAW;
3536         tty_set_operations(serial_driver, &ops);
3537         if ((rc = tty_register_driver(serial_driver)) < 0) {
3538                 DBGERR(("%s can't register serial driver\n", driver_name));
3539                 put_tty_driver(serial_driver);
3540                 serial_driver = NULL;
3541                 goto error;
3542         }
3543
3544         printk("%s %s, tty major#%d\n",
3545                 driver_name, driver_version,
3546                 serial_driver->major);
3547
3548         return 0;
3549
3550 error:
3551         slgt_cleanup();
3552         return rc;
3553 }
3554
3555 static void __exit slgt_exit(void)
3556 {
3557         slgt_cleanup();
3558 }
3559
3560 module_init(slgt_init);
3561 module_exit(slgt_exit);
3562
3563 /*
3564  * register access routines
3565  */
3566
3567 #define CALC_REGADDR() \
3568         unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3569         if (addr >= 0x80) \
3570                 reg_addr += (info->port_num) * 32;
3571
3572 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3573 {
3574         CALC_REGADDR();
3575         return readb((void __iomem *)reg_addr);
3576 }
3577
3578 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3579 {
3580         CALC_REGADDR();
3581         writeb(value, (void __iomem *)reg_addr);
3582 }
3583
3584 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3585 {
3586         CALC_REGADDR();
3587         return readw((void __iomem *)reg_addr);
3588 }
3589
3590 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3591 {
3592         CALC_REGADDR();
3593         writew(value, (void __iomem *)reg_addr);
3594 }
3595
3596 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3597 {
3598         CALC_REGADDR();
3599         return readl((void __iomem *)reg_addr);
3600 }
3601
3602 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3603 {
3604         CALC_REGADDR();
3605         writel(value, (void __iomem *)reg_addr);
3606 }
3607
3608 static void rdma_reset(struct slgt_info *info)
3609 {
3610         unsigned int i;
3611
3612         /* set reset bit */
3613         wr_reg32(info, RDCSR, BIT1);
3614
3615         /* wait for enable bit cleared */
3616         for(i=0 ; i < 1000 ; i++)
3617                 if (!(rd_reg32(info, RDCSR) & BIT0))
3618                         break;
3619 }
3620
3621 static void tdma_reset(struct slgt_info *info)
3622 {
3623         unsigned int i;
3624
3625         /* set reset bit */
3626         wr_reg32(info, TDCSR, BIT1);
3627
3628         /* wait for enable bit cleared */
3629         for(i=0 ; i < 1000 ; i++)
3630                 if (!(rd_reg32(info, TDCSR) & BIT0))
3631                         break;
3632 }
3633
3634 /*
3635  * enable internal loopback
3636  * TxCLK and RxCLK are generated from BRG
3637  * and TxD is looped back to RxD internally.
3638  */
3639 static void enable_loopback(struct slgt_info *info)
3640 {
3641         /* SCR (serial control) BIT2=looopback enable */
3642         wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3643
3644         if (info->params.mode != MGSL_MODE_ASYNC) {
3645                 /* CCR (clock control)
3646                  * 07..05  tx clock source (010 = BRG)
3647                  * 04..02  rx clock source (010 = BRG)
3648                  * 01      auxclk enable   (0 = disable)
3649                  * 00      BRG enable      (1 = enable)
3650                  *
3651                  * 0100 1001
3652                  */
3653                 wr_reg8(info, CCR, 0x49);
3654
3655                 /* set speed if available, otherwise use default */
3656                 if (info->params.clock_speed)
3657                         set_rate(info, info->params.clock_speed);
3658                 else
3659                         set_rate(info, 3686400);
3660         }
3661 }
3662
3663 /*
3664  *  set baud rate generator to specified rate
3665  */
3666 static void set_rate(struct slgt_info *info, u32 rate)
3667 {
3668         unsigned int div;
3669         static unsigned int osc = 14745600;
3670
3671         /* div = osc/rate - 1
3672          *
3673          * Round div up if osc/rate is not integer to
3674          * force to next slowest rate.
3675          */
3676
3677         if (rate) {
3678                 div = osc/rate;
3679                 if (!(osc % rate) && div)
3680                         div--;
3681                 wr_reg16(info, BDR, (unsigned short)div);
3682         }
3683 }
3684
3685 static void rx_stop(struct slgt_info *info)
3686 {
3687         unsigned short val;
3688
3689         /* disable and reset receiver */
3690         val = rd_reg16(info, RCR) & ~BIT1;          /* clear enable bit */
3691         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3692         wr_reg16(info, RCR, val);                  /* clear reset bit */
3693
3694         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3695
3696         /* clear pending rx interrupts */
3697         wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3698
3699         rdma_reset(info);
3700
3701         info->rx_enabled = 0;
3702         info->rx_restart = 0;
3703 }
3704
3705 static void rx_start(struct slgt_info *info)
3706 {
3707         unsigned short val;
3708
3709         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3710
3711         /* clear pending rx overrun IRQ */
3712         wr_reg16(info, SSR, IRQ_RXOVER);
3713
3714         /* reset and disable receiver */
3715         val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3716         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3717         wr_reg16(info, RCR, val);                  /* clear reset bit */
3718
3719         rdma_reset(info);
3720         reset_rbufs(info);
3721
3722         /* set 1st descriptor address */
3723         wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3724
3725         if (info->params.mode != MGSL_MODE_ASYNC) {
3726                 /* enable rx DMA and DMA interrupt */
3727                 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3728         } else {
3729                 /* enable saving of rx status, rx DMA and DMA interrupt */
3730                 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3731         }
3732
3733         slgt_irq_on(info, IRQ_RXOVER);
3734
3735         /* enable receiver */
3736         wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3737
3738         info->rx_restart = 0;
3739         info->rx_enabled = 1;
3740 }
3741
3742 static void tx_start(struct slgt_info *info)
3743 {
3744         if (!info->tx_enabled) {
3745                 wr_reg16(info, TCR,
3746                         (unsigned short)(rd_reg16(info, TCR) | BIT1));
3747                 info->tx_enabled = TRUE;
3748         }
3749
3750         if (info->tx_count) {
3751                 info->drop_rts_on_tx_done = 0;
3752
3753                 if (info->params.mode != MGSL_MODE_ASYNC) {
3754                         if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3755                                 get_signals(info);
3756                                 if (!(info->signals & SerialSignal_RTS)) {
3757                                         info->signals |= SerialSignal_RTS;
3758                                         set_signals(info);
3759                                         info->drop_rts_on_tx_done = 1;
3760                                 }
3761                         }
3762
3763                         slgt_irq_off(info, IRQ_TXDATA);
3764                         slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3765                         /* clear tx idle and underrun status bits */
3766                         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3767
3768                         if (!(rd_reg32(info, TDCSR) & BIT0)) {
3769                                 /* tx DMA stopped, restart tx DMA */
3770                                 tdma_reset(info);
3771                                 /* set 1st descriptor address */
3772                                 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3773                                 if (info->params.mode == MGSL_MODE_RAW)
3774                                         wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3775                                 else
3776                                         wr_reg32(info, TDCSR, BIT0); /* DMA enable */
3777                         }
3778
3779                         if (info->params.mode != MGSL_MODE_RAW) {
3780                                 info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
3781                                 add_timer(&info->tx_timer);
3782                         }
3783                 } else {
3784                         tdma_reset(info);
3785                         /* set 1st descriptor address */
3786                         wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3787
3788                         slgt_irq_off(info, IRQ_TXDATA);
3789                         slgt_irq_on(info, IRQ_TXIDLE);
3790                         /* clear tx idle status bit */
3791                         wr_reg16(info, SSR, IRQ_TXIDLE);
3792
3793                         /* enable tx DMA */
3794                         wr_reg32(info, TDCSR, BIT0);
3795                 }
3796
3797                 info->tx_active = 1;
3798         }
3799 }
3800
3801 static void tx_stop(struct slgt_info *info)
3802 {
3803         unsigned short val;
3804
3805         del_timer(&info->tx_timer);
3806
3807         tdma_reset(info);
3808
3809         /* reset and disable transmitter */
3810         val = rd_reg16(info, TCR) & ~BIT1;          /* clear enable bit */
3811         wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3812         wr_reg16(info, TCR, val);                  /* clear reset */
3813
3814         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3815
3816         /* clear tx idle and underrun status bit */
3817         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3818
3819         reset_tbufs(info);
3820
3821         info->tx_enabled = 0;
3822         info->tx_active  = 0;
3823 }
3824
3825 static void reset_port(struct slgt_info *info)
3826 {
3827         if (!info->reg_addr)
3828                 return;
3829
3830         tx_stop(info);
3831         rx_stop(info);
3832
3833         info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
3834         set_signals(info);
3835
3836         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3837 }
3838
3839 static void reset_adapter(struct slgt_info *info)
3840 {
3841         int i;
3842         for (i=0; i < info->port_count; ++i) {
3843                 if (info->port_array[i])
3844                         reset_port(info->port_array[i]);
3845         }
3846 }
3847
3848 static void async_mode(struct slgt_info *info)
3849 {
3850         unsigned short val;
3851
3852         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3853         tx_stop(info);
3854         rx_stop(info);
3855
3856         /* TCR (tx control)
3857          *
3858          * 15..13  mode, 010=async
3859          * 12..10  encoding, 000=NRZ
3860          * 09      parity enable
3861          * 08      1=odd parity, 0=even parity
3862          * 07      1=RTS driver control
3863          * 06      1=break enable
3864          * 05..04  character length
3865          *         00=5 bits
3866          *         01=6 bits
3867          *         10=7 bits
3868          *         11=8 bits
3869          * 03      0=1 stop bit, 1=2 stop bits
3870          * 02      reset
3871          * 01      enable
3872          * 00      auto-CTS enable
3873          */
3874         val = 0x4000;
3875
3876         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
3877                 val |= BIT7;
3878
3879         if (info->params.parity != ASYNC_PARITY_NONE) {
3880                 val |= BIT9;
3881                 if (info->params.parity == ASYNC_PARITY_ODD)
3882                         val |= BIT8;
3883         }
3884
3885         switch (info->params.data_bits)
3886         {
3887         case 6: val |= BIT4; break;
3888         case 7: val |= BIT5; break;
3889         case 8: val |= BIT5 + BIT4; break;
3890         }
3891
3892         if (info->params.stop_bits != 1)
3893                 val |= BIT3;
3894
3895         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3896                 val |= BIT0;
3897
3898         wr_reg16(info, TCR, val);
3899
3900         /* RCR (rx control)
3901          *
3902          * 15..13  mode, 010=async
3903          * 12..10  encoding, 000=NRZ
3904          * 09      parity enable
3905          * 08      1=odd parity, 0=even parity
3906          * 07..06  reserved, must be 0
3907          * 05..04  character length
3908          *         00=5 bits
3909          *         01=6 bits
3910          *         10=7 bits
3911          *         11=8 bits
3912          * 03      reserved, must be zero
3913          * 02      reset
3914          * 01      enable
3915          * 00      auto-DCD enable
3916          */
3917         val = 0x4000;
3918
3919         if (info->params.parity != ASYNC_PARITY_NONE) {
3920                 val |= BIT9;
3921                 if (info->params.parity == ASYNC_PARITY_ODD)
3922                         val |= BIT8;
3923         }
3924
3925         switch (info->params.data_bits)
3926         {
3927         case 6: val |= BIT4; break;
3928         case 7: val |= BIT5; break;
3929         case 8: val |= BIT5 + BIT4; break;
3930         }
3931
3932         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3933                 val |= BIT0;
3934
3935         wr_reg16(info, RCR, val);
3936
3937         /* CCR (clock control)
3938          *
3939          * 07..05  011 = tx clock source is BRG/16
3940          * 04..02  010 = rx clock source is BRG
3941          * 01      0 = auxclk disabled
3942          * 00      1 = BRG enabled
3943          *
3944          * 0110 1001
3945          */
3946         wr_reg8(info, CCR, 0x69);
3947
3948         msc_set_vcr(info);
3949
3950         /* SCR (serial control)
3951          *
3952          * 15  1=tx req on FIFO half empty
3953          * 14  1=rx req on FIFO half full
3954          * 13  tx data  IRQ enable
3955          * 12  tx idle  IRQ enable
3956          * 11  rx break on IRQ enable
3957          * 10  rx data  IRQ enable
3958          * 09  rx break off IRQ enable
3959          * 08  overrun  IRQ enable
3960          * 07  DSR      IRQ enable
3961          * 06  CTS      IRQ enable
3962          * 05  DCD      IRQ enable
3963          * 04  RI       IRQ enable
3964          * 03  reserved, must be zero
3965          * 02  1=txd->rxd internal loopback enable
3966          * 01  reserved, must be zero
3967          * 00  1=master IRQ enable
3968          */
3969         val = BIT15 + BIT14 + BIT0;
3970         wr_reg16(info, SCR, val);
3971
3972         slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
3973
3974         set_rate(info, info->params.data_rate * 16);
3975
3976         if (info->params.loopback)
3977                 enable_loopback(info);
3978 }
3979
3980 static void hdlc_mode(struct slgt_info *info)
3981 {
3982         unsigned short val;
3983
3984         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3985         tx_stop(info);
3986         rx_stop(info);
3987
3988         /* TCR (tx control)
3989          *
3990          * 15..13  mode, 000=HDLC 001=raw sync
3991          * 12..10  encoding
3992          * 09      CRC enable
3993          * 08      CRC32
3994          * 07      1=RTS driver control
3995          * 06      preamble enable
3996          * 05..04  preamble length
3997          * 03      share open/close flag
3998          * 02      reset
3999          * 01      enable
4000          * 00      auto-CTS enable
4001          */
4002         val = 0;
4003
4004         if (info->params.mode == MGSL_MODE_RAW)
4005                 val |= BIT13;
4006         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4007                 val |= BIT7;
4008
4009         switch(info->params.encoding)
4010         {
4011         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4012         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4013         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4014         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4015         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4016         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4017         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4018         }
4019
4020         switch (info->params.crc_type & HDLC_CRC_MASK)
4021         {
4022         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4023         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4024         }
4025
4026         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4027                 val |= BIT6;
4028
4029         switch (info->params.preamble_length)
4030         {
4031         case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4032         case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4033         case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4034         }
4035
4036         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4037                 val |= BIT0;
4038
4039         wr_reg16(info, TCR, val);
4040
4041         /* TPR (transmit preamble) */
4042
4043         switch (info->params.preamble)
4044         {
4045         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4046         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
4047         case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4048         case HDLC_PREAMBLE_PATTERN_10:    val = 0x55; break;
4049         case HDLC_PREAMBLE_PATTERN_01:    val = 0xaa; break;
4050         default:                          val = 0x7e; break;
4051         }
4052         wr_reg8(info, TPR, (unsigned char)val);
4053
4054         /* RCR (rx control)
4055          *
4056          * 15..13  mode, 000=HDLC 001=raw sync
4057          * 12..10  encoding
4058          * 09      CRC enable
4059          * 08      CRC32
4060          * 07..03  reserved, must be 0
4061          * 02      reset
4062          * 01      enable
4063          * 00      auto-DCD enable
4064          */
4065         val = 0;
4066
4067         if (info->params.mode == MGSL_MODE_RAW)
4068                 val |= BIT13;
4069
4070         switch(info->params.encoding)
4071         {
4072         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4073         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4074         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4075         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4076         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4077         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4078         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4079         }
4080
4081         switch (info->params.crc_type & HDLC_CRC_MASK)
4082         {
4083         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4084         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4085         }
4086
4087         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4088                 val |= BIT0;
4089
4090         wr_reg16(info, RCR, val);
4091
4092         /* CCR (clock control)
4093          *
4094          * 07..05  tx clock source
4095          * 04..02  rx clock source
4096          * 01      auxclk enable
4097          * 00      BRG enable
4098          */
4099         val = 0;
4100
4101         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4102         {
4103                 // when RxC source is DPLL, BRG generates 16X DPLL
4104                 // reference clock, so take TxC from BRG/16 to get
4105                 // transmit clock at actual data rate
4106                 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4107                         val |= BIT6 + BIT5;     /* 011, txclk = BRG/16 */
4108                 else
4109                         val |= BIT6;    /* 010, txclk = BRG */
4110         }
4111         else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4112                 val |= BIT7;    /* 100, txclk = DPLL Input */
4113         else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4114                 val |= BIT5;    /* 001, txclk = RXC Input */
4115
4116         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4117                 val |= BIT3;    /* 010, rxclk = BRG */
4118         else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4119                 val |= BIT4;    /* 100, rxclk = DPLL */
4120         else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4121                 val |= BIT2;    /* 001, rxclk = TXC Input */
4122
4123         if (info->params.clock_speed)
4124                 val |= BIT1 + BIT0;
4125
4126         wr_reg8(info, CCR, (unsigned char)val);
4127
4128         if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4129         {
4130                 // program DPLL mode
4131                 switch(info->params.encoding)
4132                 {
4133                 case HDLC_ENCODING_BIPHASE_MARK:
4134                 case HDLC_ENCODING_BIPHASE_SPACE:
4135                         val = BIT7; break;
4136                 case HDLC_ENCODING_BIPHASE_LEVEL:
4137                 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4138                         val = BIT7 + BIT6; break;
4139                 default: val = BIT6;    // NRZ encodings
4140                 }
4141                 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4142
4143                 // DPLL requires a 16X reference clock from BRG
4144                 set_rate(info, info->params.clock_speed * 16);
4145         }
4146         else
4147                 set_rate(info, info->params.clock_speed);
4148
4149         tx_set_idle(info);
4150
4151         msc_set_vcr(info);
4152
4153         /* SCR (serial control)
4154          *
4155          * 15  1=tx req on FIFO half empty
4156          * 14  1=rx req on FIFO half full
4157          * 13  tx data  IRQ enable
4158          * 12  tx idle  IRQ enable
4159          * 11  underrun IRQ enable
4160          * 10  rx data  IRQ enable
4161          * 09  rx idle  IRQ enable
4162          * 08  overrun  IRQ enable
4163          * 07  DSR      IRQ enable
4164          * 06  CTS      IRQ enable
4165          * 05  DCD      IRQ enable
4166          * 04  RI       IRQ enable
4167          * 03  reserved, must be zero
4168          * 02  1=txd->rxd internal loopback enable
4169          * 01  reserved, must be zero
4170          * 00  1=master IRQ enable
4171          */
4172         wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4173
4174         if (info->params.loopback)
4175                 enable_loopback(info);
4176 }
4177
4178 /*
4179  *  set transmit idle mode
4180  */
4181 static void tx_set_idle(struct slgt_info *info)
4182 {
4183         unsigned char val;
4184         unsigned short tcr;
4185
4186         /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4187          * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4188          */
4189         tcr = rd_reg16(info, TCR);
4190         if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4191                 /* disable preamble, set idle size to 16 bits */
4192                 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4193                 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4194                 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4195         } else if (!(tcr & BIT6)) {
4196                 /* preamble is disabled, set idle size to 8 bits */
4197                 tcr &= ~(BIT5 + BIT4);
4198         }
4199         wr_reg16(info, TCR, tcr);
4200
4201         if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4202                 /* LSB of custom tx idle specified in tx idle register */
4203                 val = (unsigned char)(info->idle_mode & 0xff);
4204         } else {
4205                 /* standard 8 bit idle patterns */
4206                 switch(info->idle_mode)
4207                 {
4208                 case HDLC_TXIDLE_FLAGS:          val = 0x7e; break;
4209                 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4210                 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4211                 case HDLC_TXIDLE_ZEROS:
4212                 case HDLC_TXIDLE_SPACE:          val = 0x00; break;
4213                 default:                         val = 0xff;
4214                 }
4215         }
4216
4217         wr_reg8(info, TIR, val);
4218 }
4219
4220 /*
4221  * get state of V24 status (input) signals
4222  */
4223 static void get_signals(struct slgt_info *info)
4224 {
4225         unsigned short status = rd_reg16(info, SSR);
4226
4227         /* clear all serial signals except DTR and RTS */
4228         info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4229
4230         if (status & BIT3)
4231                 info->signals |= SerialSignal_DSR;
4232         if (status & BIT2)
4233                 info->signals |= SerialSignal_CTS;
4234         if (status & BIT1)
4235                 info->signals |= SerialSignal_DCD;
4236         if (status & BIT0)
4237                 info->signals |= SerialSignal_RI;
4238 }
4239
4240 /*
4241  * set V.24 Control Register based on current configuration
4242  */
4243 static void msc_set_vcr(struct slgt_info *info)
4244 {
4245         unsigned char val = 0;
4246
4247         /* VCR (V.24 control)
4248          *
4249          * 07..04  serial IF select
4250          * 03      DTR
4251          * 02      RTS
4252          * 01      LL
4253          * 00      RL
4254          */
4255
4256         switch(info->if_mode & MGSL_INTERFACE_MASK)
4257         {
4258         case MGSL_INTERFACE_RS232:
4259                 val |= BIT5; /* 0010 */
4260                 break;
4261         case MGSL_INTERFACE_V35:
4262                 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4263                 break;
4264         case MGSL_INTERFACE_RS422:
4265                 val |= BIT6; /* 0100 */
4266                 break;
4267         }
4268
4269         if (info->signals & SerialSignal_DTR)
4270                 val |= BIT3;
4271         if (info->signals & SerialSignal_RTS)
4272                 val |= BIT2;
4273         if (info->if_mode & MGSL_INTERFACE_LL)
4274                 val |= BIT1;
4275         if (info->if_mode & MGSL_INTERFACE_RL)
4276                 val |= BIT0;
4277         wr_reg8(info, VCR, val);
4278 }
4279
4280 /*
4281  * set state of V24 control (output) signals
4282  */
4283 static void set_signals(struct slgt_info *info)
4284 {
4285         unsigned char val = rd_reg8(info, VCR);
4286         if (info->signals & SerialSignal_DTR)
4287                 val |= BIT3;
4288         else
4289                 val &= ~BIT3;
4290         if (info->signals & SerialSignal_RTS)
4291                 val |= BIT2;
4292         else
4293                 val &= ~BIT2;
4294         wr_reg8(info, VCR, val);
4295 }
4296
4297 /*
4298  * free range of receive DMA buffers (i to last)
4299  */
4300 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4301 {
4302         int done = 0;
4303
4304         while(!done) {
4305                 /* reset current buffer for reuse */
4306                 info->rbufs[i].status = 0;
4307                 if (info->params.mode == MGSL_MODE_RAW)
4308                         set_desc_count(info->rbufs[i], info->raw_rx_size);
4309                 else
4310                         set_desc_count(info->rbufs[i], DMABUFSIZE);
4311
4312                 if (i == last)
4313                         done = 1;
4314                 if (++i == info->rbuf_count)
4315                         i = 0;
4316         }
4317         info->rbuf_current = i;
4318 }
4319
4320 /*
4321  * mark all receive DMA buffers as free
4322  */
4323 static void reset_rbufs(struct slgt_info *info)
4324 {
4325         free_rbufs(info, 0, info->rbuf_count - 1);
4326 }
4327
4328 /*
4329  * pass receive HDLC frame to upper layer
4330  *
4331  * return 1 if frame available, otherwise 0
4332  */
4333 static int rx_get_frame(struct slgt_info *info)
4334 {
4335         unsigned int start, end;
4336         unsigned short status;
4337         unsigned int framesize = 0;
4338         int rc = 0;
4339         unsigned long flags;
4340         struct tty_struct *tty = info->tty;
4341         unsigned char addr_field = 0xff;
4342         unsigned int crc_size = 0;
4343
4344         switch (info->params.crc_type & HDLC_CRC_MASK) {
4345         case HDLC_CRC_16_CCITT: crc_size = 2; break;
4346         case HDLC_CRC_32_CCITT: crc_size = 4; break;
4347         }
4348
4349 check_again:
4350
4351         framesize = 0;
4352         addr_field = 0xff;
4353         start = end = info->rbuf_current;
4354
4355         for (;;) {
4356                 if (!desc_complete(info->rbufs[end]))
4357                         goto cleanup;
4358
4359                 if (framesize == 0 && info->params.addr_filter != 0xff)
4360                         addr_field = info->rbufs[end].buf[0];
4361
4362                 framesize += desc_count(info->rbufs[end]);
4363
4364                 if (desc_eof(info->rbufs[end]))
4365                         break;
4366
4367                 if (++end == info->rbuf_count)
4368                         end = 0;
4369
4370                 if (end == info->rbuf_current) {
4371                         if (info->rx_enabled){
4372                                 spin_lock_irqsave(&info->lock,flags);
4373                                 rx_start(info);
4374                                 spin_unlock_irqrestore(&info->lock,flags);
4375                         }
4376                         goto cleanup;
4377                 }
4378         }
4379
4380         /* status
4381          *
4382          * 15      buffer complete
4383          * 14..06  reserved
4384          * 05..04  residue
4385          * 02      eof (end of frame)
4386          * 01      CRC error
4387          * 00      abort
4388          */
4389         status = desc_status(info->rbufs[end]);
4390
4391         /* ignore CRC bit if not using CRC (bit is undefined) */
4392         if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4393                 status &= ~BIT1;
4394
4395         if (framesize == 0 ||
4396                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4397                 free_rbufs(info, start, end);
4398                 goto check_again;
4399         }
4400
4401         if (framesize < (2 + crc_size) || status & BIT0) {
4402                 info->icount.rxshort++;
4403                 framesize = 0;
4404         } else if (status & BIT1) {
4405                 info->icount.rxcrc++;
4406                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4407                         framesize = 0;
4408         }
4409
4410 #ifdef CONFIG_HDLC
4411         if (framesize == 0) {
4412                 struct net_device_stats *stats = hdlc_stats(info->netdev);
4413                 stats->rx_errors++;
4414                 stats->rx_frame_errors++;
4415         }
4416 #endif
4417
4418         DBGBH(("%s rx frame status=%04X size=%d\n",
4419                 info->device_name, status, framesize));
4420         DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, DMABUFSIZE), "rx");
4421
4422         if (framesize) {
4423                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4424                         framesize -= crc_size;
4425                         crc_size = 0;
4426                 }
4427
4428                 if (framesize > info->max_frame_size + crc_size)
4429                         info->icount.rxlong++;
4430                 else {
4431                         /* copy dma buffer(s) to contiguous temp buffer */
4432                         int copy_count = framesize;
4433                         int i = start;
4434                         unsigned char *p = info->tmp_rbuf;
4435                         info->tmp_rbuf_count = framesize;
4436
4437                         info->icount.rxok++;
4438
4439                         while(copy_count) {
4440                                 int partial_count = min(copy_count, DMABUFSIZE);
4441                                 memcpy(p, info->rbufs[i].buf, partial_count);
4442                                 p += partial_count;
4443                                 copy_count -= partial_count;
4444                                 if (++i == info->rbuf_count)
4445                                         i = 0;
4446                         }
4447
4448                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4449                                 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4450                                 framesize++;
4451                         }
4452
4453 #ifdef CONFIG_HDLC
4454                         if (info->netcount)
4455                                 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4456                         else
4457 #endif
4458                                 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4459                 }
4460         }
4461         free_rbufs(info, start, end);
4462         rc = 1;
4463
4464 cleanup:
4465         return rc;
4466 }
4467
4468 /*
4469  * pass receive buffer (RAW synchronous mode) to tty layer
4470  * return 1 if buffer available, otherwise 0
4471  */
4472 static int rx_get_buf(struct slgt_info *info)
4473 {
4474         unsigned int i = info->rbuf_current;
4475
4476         if (!desc_complete(info->rbufs[i]))
4477                 return 0;
4478         DBGDATA(info, info->rbufs[i].buf, desc_count(info->rbufs[i]), "rx");
4479         DBGINFO(("rx_get_buf size=%d\n", desc_count(info->rbufs[i])));
4480         ldisc_receive_buf(info->tty, info->rbufs[i].buf,
4481                           info->flag_buf, desc_count(info->rbufs[i]));
4482         free_rbufs(info, i, i);
4483         return 1;
4484 }
4485
4486 static void reset_tbufs(struct slgt_info *info)
4487 {
4488         unsigned int i;
4489         info->tbuf_current = 0;
4490         for (i=0 ; i < info->tbuf_count ; i++) {
4491                 info->tbufs[i].status = 0;
4492                 info->tbufs[i].count  = 0;
4493         }
4494 }
4495
4496 /*
4497  * return number of free transmit DMA buffers
4498  */
4499 static unsigned int free_tbuf_count(struct slgt_info *info)
4500 {
4501         unsigned int count = 0;
4502         unsigned int i = info->tbuf_current;
4503
4504         do
4505         {
4506                 if (desc_count(info->tbufs[i]))
4507                         break; /* buffer in use */
4508                 ++count;
4509                 if (++i == info->tbuf_count)
4510                         i=0;
4511         } while (i != info->tbuf_current);
4512
4513         /* last buffer with zero count may be in use, assume it is */
4514         if (count)
4515                 --count;
4516
4517         return count;
4518 }
4519
4520 /*
4521  * load transmit DMA buffer(s) with data
4522  */
4523 static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4524 {
4525         unsigned short count;
4526         unsigned int i;
4527         struct slgt_desc *d;
4528
4529         if (size == 0)
4530                 return;
4531
4532         DBGDATA(info, buf, size, "tx");
4533
4534         info->tbuf_start = i = info->tbuf_current;
4535
4536         while (size) {
4537                 d = &info->tbufs[i];
4538                 if (++i == info->tbuf_count)
4539                         i = 0;
4540
4541                 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4542                 memcpy(d->buf, buf, count);
4543
4544                 size -= count;
4545                 buf  += count;
4546
4547                 if (!size && info->params.mode != MGSL_MODE_RAW)
4548                         set_desc_eof(*d, 1); /* HDLC: set EOF of last desc */
4549                 else
4550                         set_desc_eof(*d, 0);
4551
4552                 set_desc_count(*d, count);
4553         }
4554
4555         info->tbuf_current = i;
4556 }
4557
4558 static int register_test(struct slgt_info *info)
4559 {
4560         static unsigned short patterns[] =
4561                 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4562         static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4563         unsigned int i;
4564         int rc = 0;
4565
4566         for (i=0 ; i < count ; i++) {
4567                 wr_reg16(info, TIR, patterns[i]);
4568                 wr_reg16(info, BDR, patterns[(i+1)%count]);
4569                 if ((rd_reg16(info, TIR) != patterns[i]) ||
4570                     (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4571                         rc = -ENODEV;
4572                         break;
4573                 }
4574         }
4575         info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4576         info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4577         return rc;
4578 }
4579
4580 static int irq_test(struct slgt_info *info)
4581 {
4582         unsigned long timeout;
4583         unsigned long flags;
4584         struct tty_struct *oldtty = info->tty;
4585         u32 speed = info->params.data_rate;
4586
4587         info->params.data_rate = 921600;
4588         info->tty = NULL;
4589
4590         spin_lock_irqsave(&info->lock, flags);
4591         async_mode(info);
4592         slgt_irq_on(info, IRQ_TXIDLE);
4593
4594         /* enable transmitter */
4595         wr_reg16(info, TCR,
4596                 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4597
4598         /* write one byte and wait for tx idle */
4599         wr_reg16(info, TDR, 0);
4600
4601         /* assume failure */
4602         info->init_error = DiagStatus_IrqFailure;
4603         info->irq_occurred = FALSE;
4604
4605         spin_unlock_irqrestore(&info->lock, flags);
4606
4607         timeout=100;
4608         while(timeout-- && !info->irq_occurred)
4609                 msleep_interruptible(10);
4610
4611         spin_lock_irqsave(&info->lock,flags);
4612         reset_port(info);
4613         spin_unlock_irqrestore(&info->lock,flags);
4614
4615         info->params.data_rate = speed;
4616         info->tty = oldtty;
4617
4618         info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4619         return info->irq_occurred ? 0 : -ENODEV;
4620 }
4621
4622 static int loopback_test_rx(struct slgt_info *info)
4623 {
4624         unsigned char *src, *dest;
4625         int count;
4626
4627         if (desc_complete(info->rbufs[0])) {
4628                 count = desc_count(info->rbufs[0]);
4629                 src   = info->rbufs[0].buf;
4630                 dest  = info->tmp_rbuf;
4631
4632                 for( ; count ; count-=2, src+=2) {
4633                         /* src=data byte (src+1)=status byte */
4634                         if (!(*(src+1) & (BIT9 + BIT8))) {
4635                                 *dest = *src;
4636                                 dest++;
4637                                 info->tmp_rbuf_count++;
4638                         }
4639                 }
4640                 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4641                 return 1;
4642         }
4643         return 0;
4644 }
4645
4646 static int loopback_test(struct slgt_info *info)
4647 {
4648 #define TESTFRAMESIZE 20
4649
4650         unsigned long timeout;
4651         u16 count = TESTFRAMESIZE;
4652         unsigned char buf[TESTFRAMESIZE];
4653         int rc = -ENODEV;
4654         unsigned long flags;
4655
4656         struct tty_struct *oldtty = info->tty;
4657         MGSL_PARAMS params;
4658
4659         memcpy(&params, &info->params, sizeof(params));
4660
4661         info->params.mode = MGSL_MODE_ASYNC;
4662         info->params.data_rate = 921600;
4663         info->params.loopback = 1;
4664         info->tty = NULL;
4665
4666         /* build and send transmit frame */
4667         for (count = 0; count < TESTFRAMESIZE; ++count)
4668                 buf[count] = (unsigned char)count;
4669
4670         info->tmp_rbuf_count = 0;
4671         memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4672
4673         /* program hardware for HDLC and enabled receiver */
4674         spin_lock_irqsave(&info->lock,flags);
4675         async_mode(info);
4676         rx_start(info);
4677         info->tx_count = count;
4678         tx_load(info, buf, count);
4679         tx_start(info);
4680         spin_unlock_irqrestore(&info->lock, flags);
4681
4682         /* wait for receive complete */
4683         for (timeout = 100; timeout; --timeout) {
4684                 msleep_interruptible(10);
4685                 if (loopback_test_rx(info)) {
4686                         rc = 0;
4687                         break;
4688                 }
4689         }
4690
4691         /* verify received frame length and contents */
4692         if (!rc && (info->tmp_rbuf_count != count ||
4693                   memcmp(buf, info->tmp_rbuf, count))) {
4694                 rc = -ENODEV;
4695         }
4696
4697         spin_lock_irqsave(&info->lock,flags);
4698         reset_adapter(info);
4699         spin_unlock_irqrestore(&info->lock,flags);
4700
4701         memcpy(&info->params, &params, sizeof(info->params));
4702         info->tty = oldtty;
4703
4704         info->init_error = rc ? DiagStatus_DmaFailure : 0;
4705         return rc;
4706 }
4707
4708 static int adapter_test(struct slgt_info *info)
4709 {
4710         DBGINFO(("testing %s\n", info->device_name));
4711         if (register_test(info) < 0) {
4712                 printk("register test failure %s addr=%08X\n",
4713                         info->device_name, info->phys_reg_addr);
4714         } else if (irq_test(info) < 0) {
4715                 printk("IRQ test failure %s IRQ=%d\n",
4716                         info->device_name, info->irq_level);
4717         } else if (loopback_test(info) < 0) {
4718                 printk("loopback test failure %s\n", info->device_name);
4719         }
4720         return info->init_error;
4721 }
4722
4723 /*
4724  * transmit timeout handler
4725  */
4726 static void tx_timeout(unsigned long context)
4727 {
4728         struct slgt_info *info = (struct slgt_info*)context;
4729         unsigned long flags;
4730
4731         DBGINFO(("%s tx_timeout\n", info->device_name));
4732         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
4733                 info->icount.txtimeout++;
4734         }
4735         spin_lock_irqsave(&info->lock,flags);
4736         info->tx_active = 0;
4737         info->tx_count = 0;
4738         spin_unlock_irqrestore(&info->lock,flags);
4739
4740 #ifdef CONFIG_HDLC
4741         if (info->netcount)
4742                 hdlcdev_tx_done(info);
4743         else
4744 #endif
4745                 bh_transmit(info);
4746 }
4747
4748 /*
4749  * receive buffer polling timer
4750  */
4751 static void rx_timeout(unsigned long context)
4752 {
4753         struct slgt_info *info = (struct slgt_info*)context;
4754         unsigned long flags;
4755
4756         DBGINFO(("%s rx_timeout\n", info->device_name));
4757         spin_lock_irqsave(&info->lock, flags);
4758         info->pending_bh |= BH_RECEIVE;
4759         spin_unlock_irqrestore(&info->lock, flags);
4760         bh_handler(info);
4761 }
4762