c96062ea72b4acffd82ea352006e7af53adb4329
[sfrench/cifs-2.6.git] / drivers / char / synclinkmp.c
1 /*
2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
3  *
4  * Device driver for Microgate SyncLink Multiport
5  * high speed multiprotocol serial adapter.
6  *
7  * written by Paul Fulghum for Microgate Corporation
8  * paulkf@microgate.com
9  *
10  * Microgate and SyncLink are trademarks of Microgate Corporation
11  *
12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
13  * This code is released under the GNU General Public License (GPL)
14  *
15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
25  * OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27
28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
29 #if defined(__i386__)
30 #  define BREAKPOINT() asm("   int $3");
31 #else
32 #  define BREAKPOINT() { }
33 #endif
34
35 #define MAX_DEVICES 12
36
37 #include <linux/module.h>
38 #include <linux/errno.h>
39 #include <linux/signal.h>
40 #include <linux/sched.h>
41 #include <linux/timer.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/major.h>
48 #include <linux/string.h>
49 #include <linux/fcntl.h>
50 #include <linux/ptrace.h>
51 #include <linux/ioport.h>
52 #include <linux/mm.h>
53 #include <linux/slab.h>
54 #include <linux/netdevice.h>
55 #include <linux/vmalloc.h>
56 #include <linux/init.h>
57 #include <linux/delay.h>
58 #include <linux/ioctl.h>
59
60 #include <asm/system.h>
61 #include <asm/io.h>
62 #include <asm/irq.h>
63 #include <asm/dma.h>
64 #include <linux/bitops.h>
65 #include <asm/types.h>
66 #include <linux/termios.h>
67 #include <linux/workqueue.h>
68 #include <linux/hdlc.h>
69 #include <linux/synclink.h>
70
71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
72 #define SYNCLINK_GENERIC_HDLC 1
73 #else
74 #define SYNCLINK_GENERIC_HDLC 0
75 #endif
76
77 #define GET_USER(error,value,addr) error = get_user(value,addr)
78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
81
82 #include <asm/uaccess.h>
83
84 static MGSL_PARAMS default_params = {
85         MGSL_MODE_HDLC,                 /* unsigned long mode */
86         0,                              /* unsigned char loopback; */
87         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
88         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
89         0,                              /* unsigned long clock_speed; */
90         0xff,                           /* unsigned char addr_filter; */
91         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
92         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
93         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
94         9600,                           /* unsigned long data_rate; */
95         8,                              /* unsigned char data_bits; */
96         1,                              /* unsigned char stop_bits; */
97         ASYNC_PARITY_NONE               /* unsigned char parity; */
98 };
99
100 /* size in bytes of DMA data buffers */
101 #define SCABUFSIZE      1024
102 #define SCA_MEM_SIZE    0x40000
103 #define SCA_BASE_SIZE   512
104 #define SCA_REG_SIZE    16
105 #define SCA_MAX_PORTS   4
106 #define SCAMAXDESC      128
107
108 #define BUFFERLISTSIZE  4096
109
110 /* SCA-I style DMA buffer descriptor */
111 typedef struct _SCADESC
112 {
113         u16     next;           /* lower l6 bits of next descriptor addr */
114         u16     buf_ptr;        /* lower 16 bits of buffer addr */
115         u8      buf_base;       /* upper 8 bits of buffer addr */
116         u8      pad1;
117         u16     length;         /* length of buffer */
118         u8      status;         /* status of buffer */
119         u8      pad2;
120 } SCADESC, *PSCADESC;
121
122 typedef struct _SCADESC_EX
123 {
124         /* device driver bookkeeping section */
125         char    *virt_addr;     /* virtual address of data buffer */
126         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
127 } SCADESC_EX, *PSCADESC_EX;
128
129 /* The queue of BH actions to be performed */
130
131 #define BH_RECEIVE  1
132 #define BH_TRANSMIT 2
133 #define BH_STATUS   4
134
135 #define IO_PIN_SHUTDOWN_LIMIT 100
136
137 struct  _input_signal_events {
138         int     ri_up;
139         int     ri_down;
140         int     dsr_up;
141         int     dsr_down;
142         int     dcd_up;
143         int     dcd_down;
144         int     cts_up;
145         int     cts_down;
146 };
147
148 /*
149  * Device instance data structure
150  */
151 typedef struct _synclinkmp_info {
152         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
153         int                     magic;
154         int                     flags;
155         int                     count;          /* count of opens */
156         int                     line;
157         unsigned short          close_delay;
158         unsigned short          closing_wait;   /* time to wait before closing */
159
160         struct mgsl_icount      icount;
161
162         struct tty_struct       *tty;
163         int                     timeout;
164         int                     x_char;         /* xon/xoff character */
165         int                     blocked_open;   /* # of blocked opens */
166         u16                     read_status_mask1;  /* break detection (SR1 indications) */
167         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
168         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
169         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
170         unsigned char           *tx_buf;
171         int                     tx_put;
172         int                     tx_get;
173         int                     tx_count;
174
175         wait_queue_head_t       open_wait;
176         wait_queue_head_t       close_wait;
177
178         wait_queue_head_t       status_event_wait_q;
179         wait_queue_head_t       event_wait_q;
180         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
181         struct _synclinkmp_info *next_device;   /* device list link */
182         struct timer_list       status_timer;   /* input signal status check timer */
183
184         spinlock_t lock;                /* spinlock for synchronizing with ISR */
185         struct work_struct task;                        /* task structure for scheduling bh */
186
187         u32 max_frame_size;                     /* as set by device config */
188
189         u32 pending_bh;
190
191         int bh_running;                         /* Protection from multiple */
192         int isr_overflow;
193         int bh_requested;
194
195         int dcd_chkcount;                       /* check counts to prevent */
196         int cts_chkcount;                       /* too many IRQs if a signal */
197         int dsr_chkcount;                       /* is floating */
198         int ri_chkcount;
199
200         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
201         unsigned long buffer_list_phys;
202
203         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
204         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
205         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
206         unsigned int current_rx_buf;
207
208         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
209         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
210         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
211         unsigned int last_tx_buf;
212
213         unsigned char *tmp_rx_buf;
214         unsigned int tmp_rx_buf_count;
215
216         int rx_enabled;
217         int rx_overflow;
218
219         int tx_enabled;
220         int tx_active;
221         u32 idle_mode;
222
223         unsigned char ie0_value;
224         unsigned char ie1_value;
225         unsigned char ie2_value;
226         unsigned char ctrlreg_value;
227         unsigned char old_signals;
228
229         char device_name[25];                   /* device instance name */
230
231         int port_count;
232         int adapter_num;
233         int port_num;
234
235         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
236
237         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
238
239         unsigned int irq_level;                 /* interrupt level */
240         unsigned long irq_flags;
241         int irq_requested;                      /* nonzero if IRQ requested */
242
243         MGSL_PARAMS params;                     /* communications parameters */
244
245         unsigned char serial_signals;           /* current serial signal states */
246
247         int irq_occurred;                       /* for diagnostics use */
248         unsigned int init_error;                /* Initialization startup error */
249
250         u32 last_mem_alloc;
251         unsigned char* memory_base;             /* shared memory address (PCI only) */
252         u32 phys_memory_base;
253         int shared_mem_requested;
254
255         unsigned char* sca_base;                /* HD64570 SCA Memory address */
256         u32 phys_sca_base;
257         u32 sca_offset;
258         int sca_base_requested;
259
260         unsigned char* lcr_base;                /* local config registers (PCI only) */
261         u32 phys_lcr_base;
262         u32 lcr_offset;
263         int lcr_mem_requested;
264
265         unsigned char* statctrl_base;           /* status/control register memory */
266         u32 phys_statctrl_base;
267         u32 statctrl_offset;
268         int sca_statctrl_requested;
269
270         u32 misc_ctrl_value;
271         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
272         char char_buf[MAX_ASYNC_BUFFER_SIZE];
273         BOOLEAN drop_rts_on_tx_done;
274
275         struct  _input_signal_events    input_signal_events;
276
277         /* SPPP/Cisco HDLC device parts */
278         int netcount;
279         int dosyncppp;
280         spinlock_t netlock;
281
282 #if SYNCLINK_GENERIC_HDLC
283         struct net_device *netdev;
284 #endif
285
286 } SLMP_INFO;
287
288 #define MGSL_MAGIC 0x5401
289
290 /*
291  * define serial signal status change macros
292  */
293 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
294 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
295 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
296 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
297
298 /* Common Register macros */
299 #define LPR     0x00
300 #define PABR0   0x02
301 #define PABR1   0x03
302 #define WCRL    0x04
303 #define WCRM    0x05
304 #define WCRH    0x06
305 #define DPCR    0x08
306 #define DMER    0x09
307 #define ISR0    0x10
308 #define ISR1    0x11
309 #define ISR2    0x12
310 #define IER0    0x14
311 #define IER1    0x15
312 #define IER2    0x16
313 #define ITCR    0x18
314 #define INTVR   0x1a
315 #define IMVR    0x1c
316
317 /* MSCI Register macros */
318 #define TRB     0x20
319 #define TRBL    0x20
320 #define TRBH    0x21
321 #define SR0     0x22
322 #define SR1     0x23
323 #define SR2     0x24
324 #define SR3     0x25
325 #define FST     0x26
326 #define IE0     0x28
327 #define IE1     0x29
328 #define IE2     0x2a
329 #define FIE     0x2b
330 #define CMD     0x2c
331 #define MD0     0x2e
332 #define MD1     0x2f
333 #define MD2     0x30
334 #define CTL     0x31
335 #define SA0     0x32
336 #define SA1     0x33
337 #define IDL     0x34
338 #define TMC     0x35
339 #define RXS     0x36
340 #define TXS     0x37
341 #define TRC0    0x38
342 #define TRC1    0x39
343 #define RRC     0x3a
344 #define CST0    0x3c
345 #define CST1    0x3d
346
347 /* Timer Register Macros */
348 #define TCNT    0x60
349 #define TCNTL   0x60
350 #define TCNTH   0x61
351 #define TCONR   0x62
352 #define TCONRL  0x62
353 #define TCONRH  0x63
354 #define TMCS    0x64
355 #define TEPR    0x65
356
357 /* DMA Controller Register macros */
358 #define DARL    0x80
359 #define DARH    0x81
360 #define DARB    0x82
361 #define BAR     0x80
362 #define BARL    0x80
363 #define BARH    0x81
364 #define BARB    0x82
365 #define SAR     0x84
366 #define SARL    0x84
367 #define SARH    0x85
368 #define SARB    0x86
369 #define CPB     0x86
370 #define CDA     0x88
371 #define CDAL    0x88
372 #define CDAH    0x89
373 #define EDA     0x8a
374 #define EDAL    0x8a
375 #define EDAH    0x8b
376 #define BFL     0x8c
377 #define BFLL    0x8c
378 #define BFLH    0x8d
379 #define BCR     0x8e
380 #define BCRL    0x8e
381 #define BCRH    0x8f
382 #define DSR     0x90
383 #define DMR     0x91
384 #define FCT     0x93
385 #define DIR     0x94
386 #define DCMD    0x95
387
388 /* combine with timer or DMA register address */
389 #define TIMER0  0x00
390 #define TIMER1  0x08
391 #define TIMER2  0x10
392 #define TIMER3  0x18
393 #define RXDMA   0x00
394 #define TXDMA   0x20
395
396 /* SCA Command Codes */
397 #define NOOP            0x00
398 #define TXRESET         0x01
399 #define TXENABLE        0x02
400 #define TXDISABLE       0x03
401 #define TXCRCINIT       0x04
402 #define TXCRCEXCL       0x05
403 #define TXEOM           0x06
404 #define TXABORT         0x07
405 #define MPON            0x08
406 #define TXBUFCLR        0x09
407 #define RXRESET         0x11
408 #define RXENABLE        0x12
409 #define RXDISABLE       0x13
410 #define RXCRCINIT       0x14
411 #define RXREJECT        0x15
412 #define SEARCHMP        0x16
413 #define RXCRCEXCL       0x17
414 #define RXCRCCALC       0x18
415 #define CHRESET         0x21
416 #define HUNT            0x31
417
418 /* DMA command codes */
419 #define SWABORT         0x01
420 #define FEICLEAR        0x02
421
422 /* IE0 */
423 #define TXINTE          BIT7
424 #define RXINTE          BIT6
425 #define TXRDYE          BIT1
426 #define RXRDYE          BIT0
427
428 /* IE1 & SR1 */
429 #define UDRN    BIT7
430 #define IDLE    BIT6
431 #define SYNCD   BIT4
432 #define FLGD    BIT4
433 #define CCTS    BIT3
434 #define CDCD    BIT2
435 #define BRKD    BIT1
436 #define ABTD    BIT1
437 #define GAPD    BIT1
438 #define BRKE    BIT0
439 #define IDLD    BIT0
440
441 /* IE2 & SR2 */
442 #define EOM     BIT7
443 #define PMP     BIT6
444 #define SHRT    BIT6
445 #define PE      BIT5
446 #define ABT     BIT5
447 #define FRME    BIT4
448 #define RBIT    BIT4
449 #define OVRN    BIT3
450 #define CRCE    BIT2
451
452
453 /*
454  * Global linked list of SyncLink devices
455  */
456 static SLMP_INFO *synclinkmp_device_list = NULL;
457 static int synclinkmp_adapter_count = -1;
458 static int synclinkmp_device_count = 0;
459
460 /*
461  * Set this param to non-zero to load eax with the
462  * .text section address and breakpoint on module load.
463  * This is useful for use with gdb and add-symbol-file command.
464  */
465 static int break_on_load=0;
466
467 /*
468  * Driver major number, defaults to zero to get auto
469  * assigned major number. May be forced as module parameter.
470  */
471 static int ttymajor=0;
472
473 /*
474  * Array of user specified options for ISA adapters.
475  */
476 static int debug_level = 0;
477 static int maxframe[MAX_DEVICES] = {0,};
478 static int dosyncppp[MAX_DEVICES] = {0,};
479
480 module_param(break_on_load, bool, 0);
481 module_param(ttymajor, int, 0);
482 module_param(debug_level, int, 0);
483 module_param_array(maxframe, int, NULL, 0);
484 module_param_array(dosyncppp, int, NULL, 0);
485
486 static char *driver_name = "SyncLink MultiPort driver";
487 static char *driver_version = "$Revision: 4.38 $";
488
489 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
490 static void synclinkmp_remove_one(struct pci_dev *dev);
491
492 static struct pci_device_id synclinkmp_pci_tbl[] = {
493         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
494         { 0, }, /* terminate list */
495 };
496 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
497
498 MODULE_LICENSE("GPL");
499
500 static struct pci_driver synclinkmp_pci_driver = {
501         .name           = "synclinkmp",
502         .id_table       = synclinkmp_pci_tbl,
503         .probe          = synclinkmp_init_one,
504         .remove         = __devexit_p(synclinkmp_remove_one),
505 };
506
507
508 static struct tty_driver *serial_driver;
509
510 /* number of characters left in xmit buffer before we ask for more */
511 #define WAKEUP_CHARS 256
512
513
514 /* tty callbacks */
515
516 static int  open(struct tty_struct *tty, struct file * filp);
517 static void close(struct tty_struct *tty, struct file * filp);
518 static void hangup(struct tty_struct *tty);
519 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
520
521 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
522 static void put_char(struct tty_struct *tty, unsigned char ch);
523 static void send_xchar(struct tty_struct *tty, char ch);
524 static void wait_until_sent(struct tty_struct *tty, int timeout);
525 static int  write_room(struct tty_struct *tty);
526 static void flush_chars(struct tty_struct *tty);
527 static void flush_buffer(struct tty_struct *tty);
528 static void tx_hold(struct tty_struct *tty);
529 static void tx_release(struct tty_struct *tty);
530
531 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
532 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
533 static int  chars_in_buffer(struct tty_struct *tty);
534 static void throttle(struct tty_struct * tty);
535 static void unthrottle(struct tty_struct * tty);
536 static void set_break(struct tty_struct *tty, int break_state);
537
538 #if SYNCLINK_GENERIC_HDLC
539 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
540 static void hdlcdev_tx_done(SLMP_INFO *info);
541 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
542 static int  hdlcdev_init(SLMP_INFO *info);
543 static void hdlcdev_exit(SLMP_INFO *info);
544 #endif
545
546 /* ioctl handlers */
547
548 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
549 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
550 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
551 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
552 static int  set_txidle(SLMP_INFO *info, int idle_mode);
553 static int  tx_enable(SLMP_INFO *info, int enable);
554 static int  tx_abort(SLMP_INFO *info);
555 static int  rx_enable(SLMP_INFO *info, int enable);
556 static int  modem_input_wait(SLMP_INFO *info,int arg);
557 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
558 static int  tiocmget(struct tty_struct *tty, struct file *file);
559 static int  tiocmset(struct tty_struct *tty, struct file *file,
560                      unsigned int set, unsigned int clear);
561 static void set_break(struct tty_struct *tty, int break_state);
562
563 static void add_device(SLMP_INFO *info);
564 static void device_init(int adapter_num, struct pci_dev *pdev);
565 static int  claim_resources(SLMP_INFO *info);
566 static void release_resources(SLMP_INFO *info);
567
568 static int  startup(SLMP_INFO *info);
569 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
570 static void shutdown(SLMP_INFO *info);
571 static void program_hw(SLMP_INFO *info);
572 static void change_params(SLMP_INFO *info);
573
574 static int  init_adapter(SLMP_INFO *info);
575 static int  register_test(SLMP_INFO *info);
576 static int  irq_test(SLMP_INFO *info);
577 static int  loopback_test(SLMP_INFO *info);
578 static int  adapter_test(SLMP_INFO *info);
579 static int  memory_test(SLMP_INFO *info);
580
581 static void reset_adapter(SLMP_INFO *info);
582 static void reset_port(SLMP_INFO *info);
583 static void async_mode(SLMP_INFO *info);
584 static void hdlc_mode(SLMP_INFO *info);
585
586 static void rx_stop(SLMP_INFO *info);
587 static void rx_start(SLMP_INFO *info);
588 static void rx_reset_buffers(SLMP_INFO *info);
589 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
590 static int  rx_get_frame(SLMP_INFO *info);
591
592 static void tx_start(SLMP_INFO *info);
593 static void tx_stop(SLMP_INFO *info);
594 static void tx_load_fifo(SLMP_INFO *info);
595 static void tx_set_idle(SLMP_INFO *info);
596 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
597
598 static void get_signals(SLMP_INFO *info);
599 static void set_signals(SLMP_INFO *info);
600 static void enable_loopback(SLMP_INFO *info, int enable);
601 static void set_rate(SLMP_INFO *info, u32 data_rate);
602
603 static int  bh_action(SLMP_INFO *info);
604 static void bh_handler(struct work_struct *work);
605 static void bh_receive(SLMP_INFO *info);
606 static void bh_transmit(SLMP_INFO *info);
607 static void bh_status(SLMP_INFO *info);
608 static void isr_timer(SLMP_INFO *info);
609 static void isr_rxint(SLMP_INFO *info);
610 static void isr_rxrdy(SLMP_INFO *info);
611 static void isr_txint(SLMP_INFO *info);
612 static void isr_txrdy(SLMP_INFO *info);
613 static void isr_rxdmaok(SLMP_INFO *info);
614 static void isr_rxdmaerror(SLMP_INFO *info);
615 static void isr_txdmaok(SLMP_INFO *info);
616 static void isr_txdmaerror(SLMP_INFO *info);
617 static void isr_io_pin(SLMP_INFO *info, u16 status);
618
619 static int  alloc_dma_bufs(SLMP_INFO *info);
620 static void free_dma_bufs(SLMP_INFO *info);
621 static int  alloc_buf_list(SLMP_INFO *info);
622 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
623 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
624 static void free_tmp_rx_buf(SLMP_INFO *info);
625
626 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
627 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
628 static void tx_timeout(unsigned long context);
629 static void status_timeout(unsigned long context);
630
631 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
632 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
633 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
634 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
635 static unsigned char read_status_reg(SLMP_INFO * info);
636 static void write_control_reg(SLMP_INFO * info);
637
638
639 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
640 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
641 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
642
643 static u32 misc_ctrl_value = 0x007e4040;
644 static u32 lcr1_brdr_value = 0x00800028;
645
646 static u32 read_ahead_count = 8;
647
648 /* DPCR, DMA Priority Control
649  *
650  * 07..05  Not used, must be 0
651  * 04      BRC, bus release condition: 0=all transfers complete
652  *              1=release after 1 xfer on all channels
653  * 03      CCC, channel change condition: 0=every cycle
654  *              1=after each channel completes all xfers
655  * 02..00  PR<2..0>, priority 100=round robin
656  *
657  * 00000100 = 0x00
658  */
659 static unsigned char dma_priority = 0x04;
660
661 // Number of bytes that can be written to shared RAM
662 // in a single write operation
663 static u32 sca_pci_load_interval = 64;
664
665 /*
666  * 1st function defined in .text section. Calling this function in
667  * init_module() followed by a breakpoint allows a remote debugger
668  * (gdb) to get the .text address for the add-symbol-file command.
669  * This allows remote debugging of dynamically loadable modules.
670  */
671 static void* synclinkmp_get_text_ptr(void);
672 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
673
674 static inline int sanity_check(SLMP_INFO *info,
675                                char *name, const char *routine)
676 {
677 #ifdef SANITY_CHECK
678         static const char *badmagic =
679                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
680         static const char *badinfo =
681                 "Warning: null synclinkmp_struct for (%s) in %s\n";
682
683         if (!info) {
684                 printk(badinfo, name, routine);
685                 return 1;
686         }
687         if (info->magic != MGSL_MAGIC) {
688                 printk(badmagic, name, routine);
689                 return 1;
690         }
691 #else
692         if (!info)
693                 return 1;
694 #endif
695         return 0;
696 }
697
698 /**
699  * line discipline callback wrappers
700  *
701  * The wrappers maintain line discipline references
702  * while calling into the line discipline.
703  *
704  * ldisc_receive_buf  - pass receive data to line discipline
705  */
706
707 static void ldisc_receive_buf(struct tty_struct *tty,
708                               const __u8 *data, char *flags, int count)
709 {
710         struct tty_ldisc *ld;
711         if (!tty)
712                 return;
713         ld = tty_ldisc_ref(tty);
714         if (ld) {
715                 if (ld->receive_buf)
716                         ld->receive_buf(tty, data, flags, count);
717                 tty_ldisc_deref(ld);
718         }
719 }
720
721 /* tty callbacks */
722
723 /* Called when a port is opened.  Init and enable port.
724  */
725 static int open(struct tty_struct *tty, struct file *filp)
726 {
727         SLMP_INFO *info;
728         int retval, line;
729         unsigned long flags;
730
731         line = tty->index;
732         if ((line < 0) || (line >= synclinkmp_device_count)) {
733                 printk("%s(%d): open with invalid line #%d.\n",
734                         __FILE__,__LINE__,line);
735                 return -ENODEV;
736         }
737
738         info = synclinkmp_device_list;
739         while(info && info->line != line)
740                 info = info->next_device;
741         if (sanity_check(info, tty->name, "open"))
742                 return -ENODEV;
743         if ( info->init_error ) {
744                 printk("%s(%d):%s device is not allocated, init error=%d\n",
745                         __FILE__,__LINE__,info->device_name,info->init_error);
746                 return -ENODEV;
747         }
748
749         tty->driver_data = info;
750         info->tty = tty;
751
752         if (debug_level >= DEBUG_LEVEL_INFO)
753                 printk("%s(%d):%s open(), old ref count = %d\n",
754                          __FILE__,__LINE__,tty->driver->name, info->count);
755
756         /* If port is closing, signal caller to try again */
757         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
758                 if (info->flags & ASYNC_CLOSING)
759                         interruptible_sleep_on(&info->close_wait);
760                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
761                         -EAGAIN : -ERESTARTSYS);
762                 goto cleanup;
763         }
764
765         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
766
767         spin_lock_irqsave(&info->netlock, flags);
768         if (info->netcount) {
769                 retval = -EBUSY;
770                 spin_unlock_irqrestore(&info->netlock, flags);
771                 goto cleanup;
772         }
773         info->count++;
774         spin_unlock_irqrestore(&info->netlock, flags);
775
776         if (info->count == 1) {
777                 /* 1st open on this device, init hardware */
778                 retval = startup(info);
779                 if (retval < 0)
780                         goto cleanup;
781         }
782
783         retval = block_til_ready(tty, filp, info);
784         if (retval) {
785                 if (debug_level >= DEBUG_LEVEL_INFO)
786                         printk("%s(%d):%s block_til_ready() returned %d\n",
787                                  __FILE__,__LINE__, info->device_name, retval);
788                 goto cleanup;
789         }
790
791         if (debug_level >= DEBUG_LEVEL_INFO)
792                 printk("%s(%d):%s open() success\n",
793                          __FILE__,__LINE__, info->device_name);
794         retval = 0;
795
796 cleanup:
797         if (retval) {
798                 if (tty->count == 1)
799                         info->tty = NULL; /* tty layer will release tty struct */
800                 if(info->count)
801                         info->count--;
802         }
803
804         return retval;
805 }
806
807 /* Called when port is closed. Wait for remaining data to be
808  * sent. Disable port and free resources.
809  */
810 static void close(struct tty_struct *tty, struct file *filp)
811 {
812         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
813
814         if (sanity_check(info, tty->name, "close"))
815                 return;
816
817         if (debug_level >= DEBUG_LEVEL_INFO)
818                 printk("%s(%d):%s close() entry, count=%d\n",
819                          __FILE__,__LINE__, info->device_name, info->count);
820
821         if (!info->count)
822                 return;
823
824         if (tty_hung_up_p(filp))
825                 goto cleanup;
826
827         if ((tty->count == 1) && (info->count != 1)) {
828                 /*
829                  * tty->count is 1 and the tty structure will be freed.
830                  * info->count should be one in this case.
831                  * if it's not, correct it so that the port is shutdown.
832                  */
833                 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
834                        "info->count is %d\n",
835                          __FILE__,__LINE__, info->device_name, info->count);
836                 info->count = 1;
837         }
838
839         info->count--;
840
841         /* if at least one open remaining, leave hardware active */
842         if (info->count)
843                 goto cleanup;
844
845         info->flags |= ASYNC_CLOSING;
846
847         /* set tty->closing to notify line discipline to
848          * only process XON/XOFF characters. Only the N_TTY
849          * discipline appears to use this (ppp does not).
850          */
851         tty->closing = 1;
852
853         /* wait for transmit data to clear all layers */
854
855         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
856                 if (debug_level >= DEBUG_LEVEL_INFO)
857                         printk("%s(%d):%s close() calling tty_wait_until_sent\n",
858                                  __FILE__,__LINE__, info->device_name );
859                 tty_wait_until_sent(tty, info->closing_wait);
860         }
861
862         if (info->flags & ASYNC_INITIALIZED)
863                 wait_until_sent(tty, info->timeout);
864
865         if (tty->driver->flush_buffer)
866                 tty->driver->flush_buffer(tty);
867
868         tty_ldisc_flush(tty);
869
870         shutdown(info);
871
872         tty->closing = 0;
873         info->tty = NULL;
874
875         if (info->blocked_open) {
876                 if (info->close_delay) {
877                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
878                 }
879                 wake_up_interruptible(&info->open_wait);
880         }
881
882         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
883
884         wake_up_interruptible(&info->close_wait);
885
886 cleanup:
887         if (debug_level >= DEBUG_LEVEL_INFO)
888                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
889                         tty->driver->name, info->count);
890 }
891
892 /* Called by tty_hangup() when a hangup is signaled.
893  * This is the same as closing all open descriptors for the port.
894  */
895 static void hangup(struct tty_struct *tty)
896 {
897         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
898
899         if (debug_level >= DEBUG_LEVEL_INFO)
900                 printk("%s(%d):%s hangup()\n",
901                          __FILE__,__LINE__, info->device_name );
902
903         if (sanity_check(info, tty->name, "hangup"))
904                 return;
905
906         flush_buffer(tty);
907         shutdown(info);
908
909         info->count = 0;
910         info->flags &= ~ASYNC_NORMAL_ACTIVE;
911         info->tty = NULL;
912
913         wake_up_interruptible(&info->open_wait);
914 }
915
916 /* Set new termios settings
917  */
918 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
919 {
920         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
921         unsigned long flags;
922
923         if (debug_level >= DEBUG_LEVEL_INFO)
924                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
925                         tty->driver->name );
926
927         change_params(info);
928
929         /* Handle transition to B0 status */
930         if (old_termios->c_cflag & CBAUD &&
931             !(tty->termios->c_cflag & CBAUD)) {
932                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
933                 spin_lock_irqsave(&info->lock,flags);
934                 set_signals(info);
935                 spin_unlock_irqrestore(&info->lock,flags);
936         }
937
938         /* Handle transition away from B0 status */
939         if (!(old_termios->c_cflag & CBAUD) &&
940             tty->termios->c_cflag & CBAUD) {
941                 info->serial_signals |= SerialSignal_DTR;
942                 if (!(tty->termios->c_cflag & CRTSCTS) ||
943                     !test_bit(TTY_THROTTLED, &tty->flags)) {
944                         info->serial_signals |= SerialSignal_RTS;
945                 }
946                 spin_lock_irqsave(&info->lock,flags);
947                 set_signals(info);
948                 spin_unlock_irqrestore(&info->lock,flags);
949         }
950
951         /* Handle turning off CRTSCTS */
952         if (old_termios->c_cflag & CRTSCTS &&
953             !(tty->termios->c_cflag & CRTSCTS)) {
954                 tty->hw_stopped = 0;
955                 tx_release(tty);
956         }
957 }
958
959 /* Send a block of data
960  *
961  * Arguments:
962  *
963  *      tty             pointer to tty information structure
964  *      buf             pointer to buffer containing send data
965  *      count           size of send data in bytes
966  *
967  * Return Value:        number of characters written
968  */
969 static int write(struct tty_struct *tty,
970                  const unsigned char *buf, int count)
971 {
972         int     c, ret = 0;
973         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
974         unsigned long flags;
975
976         if (debug_level >= DEBUG_LEVEL_INFO)
977                 printk("%s(%d):%s write() count=%d\n",
978                        __FILE__,__LINE__,info->device_name,count);
979
980         if (sanity_check(info, tty->name, "write"))
981                 goto cleanup;
982
983         if (!info->tx_buf)
984                 goto cleanup;
985
986         if (info->params.mode == MGSL_MODE_HDLC) {
987                 if (count > info->max_frame_size) {
988                         ret = -EIO;
989                         goto cleanup;
990                 }
991                 if (info->tx_active)
992                         goto cleanup;
993                 if (info->tx_count) {
994                         /* send accumulated data from send_char() calls */
995                         /* as frame and wait before accepting more data. */
996                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
997                         goto start;
998                 }
999                 ret = info->tx_count = count;
1000                 tx_load_dma_buffer(info, buf, count);
1001                 goto start;
1002         }
1003
1004         for (;;) {
1005                 c = min_t(int, count,
1006                         min(info->max_frame_size - info->tx_count - 1,
1007                             info->max_frame_size - info->tx_put));
1008                 if (c <= 0)
1009                         break;
1010                         
1011                 memcpy(info->tx_buf + info->tx_put, buf, c);
1012
1013                 spin_lock_irqsave(&info->lock,flags);
1014                 info->tx_put += c;
1015                 if (info->tx_put >= info->max_frame_size)
1016                         info->tx_put -= info->max_frame_size;
1017                 info->tx_count += c;
1018                 spin_unlock_irqrestore(&info->lock,flags);
1019
1020                 buf += c;
1021                 count -= c;
1022                 ret += c;
1023         }
1024
1025         if (info->params.mode == MGSL_MODE_HDLC) {
1026                 if (count) {
1027                         ret = info->tx_count = 0;
1028                         goto cleanup;
1029                 }
1030                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1031         }
1032 start:
1033         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1034                 spin_lock_irqsave(&info->lock,flags);
1035                 if (!info->tx_active)
1036                         tx_start(info);
1037                 spin_unlock_irqrestore(&info->lock,flags);
1038         }
1039
1040 cleanup:
1041         if (debug_level >= DEBUG_LEVEL_INFO)
1042                 printk( "%s(%d):%s write() returning=%d\n",
1043                         __FILE__,__LINE__,info->device_name,ret);
1044         return ret;
1045 }
1046
1047 /* Add a character to the transmit buffer.
1048  */
1049 static void put_char(struct tty_struct *tty, unsigned char ch)
1050 {
1051         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1052         unsigned long flags;
1053
1054         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1055                 printk( "%s(%d):%s put_char(%d)\n",
1056                         __FILE__,__LINE__,info->device_name,ch);
1057         }
1058
1059         if (sanity_check(info, tty->name, "put_char"))
1060                 return;
1061
1062         if (!info->tx_buf)
1063                 return;
1064
1065         spin_lock_irqsave(&info->lock,flags);
1066
1067         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1068              !info->tx_active ) {
1069
1070                 if (info->tx_count < info->max_frame_size - 1) {
1071                         info->tx_buf[info->tx_put++] = ch;
1072                         if (info->tx_put >= info->max_frame_size)
1073                                 info->tx_put -= info->max_frame_size;
1074                         info->tx_count++;
1075                 }
1076         }
1077
1078         spin_unlock_irqrestore(&info->lock,flags);
1079 }
1080
1081 /* Send a high-priority XON/XOFF character
1082  */
1083 static void send_xchar(struct tty_struct *tty, char ch)
1084 {
1085         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1086         unsigned long flags;
1087
1088         if (debug_level >= DEBUG_LEVEL_INFO)
1089                 printk("%s(%d):%s send_xchar(%d)\n",
1090                          __FILE__,__LINE__, info->device_name, ch );
1091
1092         if (sanity_check(info, tty->name, "send_xchar"))
1093                 return;
1094
1095         info->x_char = ch;
1096         if (ch) {
1097                 /* Make sure transmit interrupts are on */
1098                 spin_lock_irqsave(&info->lock,flags);
1099                 if (!info->tx_enabled)
1100                         tx_start(info);
1101                 spin_unlock_irqrestore(&info->lock,flags);
1102         }
1103 }
1104
1105 /* Wait until the transmitter is empty.
1106  */
1107 static void wait_until_sent(struct tty_struct *tty, int timeout)
1108 {
1109         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1110         unsigned long orig_jiffies, char_time;
1111
1112         if (!info )
1113                 return;
1114
1115         if (debug_level >= DEBUG_LEVEL_INFO)
1116                 printk("%s(%d):%s wait_until_sent() entry\n",
1117                          __FILE__,__LINE__, info->device_name );
1118
1119         if (sanity_check(info, tty->name, "wait_until_sent"))
1120                 return;
1121
1122         if (!(info->flags & ASYNC_INITIALIZED))
1123                 goto exit;
1124
1125         orig_jiffies = jiffies;
1126
1127         /* Set check interval to 1/5 of estimated time to
1128          * send a character, and make it at least 1. The check
1129          * interval should also be less than the timeout.
1130          * Note: use tight timings here to satisfy the NIST-PCTS.
1131          */
1132
1133         if ( info->params.data_rate ) {
1134                 char_time = info->timeout/(32 * 5);
1135                 if (!char_time)
1136                         char_time++;
1137         } else
1138                 char_time = 1;
1139
1140         if (timeout)
1141                 char_time = min_t(unsigned long, char_time, timeout);
1142
1143         if ( info->params.mode == MGSL_MODE_HDLC ) {
1144                 while (info->tx_active) {
1145                         msleep_interruptible(jiffies_to_msecs(char_time));
1146                         if (signal_pending(current))
1147                                 break;
1148                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1149                                 break;
1150                 }
1151         } else {
1152                 //TODO: determine if there is something similar to USC16C32
1153                 //      TXSTATUS_ALL_SENT status
1154                 while ( info->tx_active && info->tx_enabled) {
1155                         msleep_interruptible(jiffies_to_msecs(char_time));
1156                         if (signal_pending(current))
1157                                 break;
1158                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1159                                 break;
1160                 }
1161         }
1162
1163 exit:
1164         if (debug_level >= DEBUG_LEVEL_INFO)
1165                 printk("%s(%d):%s wait_until_sent() exit\n",
1166                          __FILE__,__LINE__, info->device_name );
1167 }
1168
1169 /* Return the count of free bytes in transmit buffer
1170  */
1171 static int write_room(struct tty_struct *tty)
1172 {
1173         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1174         int ret;
1175
1176         if (sanity_check(info, tty->name, "write_room"))
1177                 return 0;
1178
1179         if (info->params.mode == MGSL_MODE_HDLC) {
1180                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1181         } else {
1182                 ret = info->max_frame_size - info->tx_count - 1;
1183                 if (ret < 0)
1184                         ret = 0;
1185         }
1186
1187         if (debug_level >= DEBUG_LEVEL_INFO)
1188                 printk("%s(%d):%s write_room()=%d\n",
1189                        __FILE__, __LINE__, info->device_name, ret);
1190
1191         return ret;
1192 }
1193
1194 /* enable transmitter and send remaining buffered characters
1195  */
1196 static void flush_chars(struct tty_struct *tty)
1197 {
1198         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1199         unsigned long flags;
1200
1201         if ( debug_level >= DEBUG_LEVEL_INFO )
1202                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1203                         __FILE__,__LINE__,info->device_name,info->tx_count);
1204
1205         if (sanity_check(info, tty->name, "flush_chars"))
1206                 return;
1207
1208         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1209             !info->tx_buf)
1210                 return;
1211
1212         if ( debug_level >= DEBUG_LEVEL_INFO )
1213                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1214                         __FILE__,__LINE__,info->device_name );
1215
1216         spin_lock_irqsave(&info->lock,flags);
1217
1218         if (!info->tx_active) {
1219                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1220                         info->tx_count ) {
1221                         /* operating in synchronous (frame oriented) mode */
1222                         /* copy data from circular tx_buf to */
1223                         /* transmit DMA buffer. */
1224                         tx_load_dma_buffer(info,
1225                                  info->tx_buf,info->tx_count);
1226                 }
1227                 tx_start(info);
1228         }
1229
1230         spin_unlock_irqrestore(&info->lock,flags);
1231 }
1232
1233 /* Discard all data in the send buffer
1234  */
1235 static void flush_buffer(struct tty_struct *tty)
1236 {
1237         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1238         unsigned long flags;
1239
1240         if (debug_level >= DEBUG_LEVEL_INFO)
1241                 printk("%s(%d):%s flush_buffer() entry\n",
1242                          __FILE__,__LINE__, info->device_name );
1243
1244         if (sanity_check(info, tty->name, "flush_buffer"))
1245                 return;
1246
1247         spin_lock_irqsave(&info->lock,flags);
1248         info->tx_count = info->tx_put = info->tx_get = 0;
1249         del_timer(&info->tx_timer);
1250         spin_unlock_irqrestore(&info->lock,flags);
1251
1252         tty_wakeup(tty);
1253 }
1254
1255 /* throttle (stop) transmitter
1256  */
1257 static void tx_hold(struct tty_struct *tty)
1258 {
1259         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1260         unsigned long flags;
1261
1262         if (sanity_check(info, tty->name, "tx_hold"))
1263                 return;
1264
1265         if ( debug_level >= DEBUG_LEVEL_INFO )
1266                 printk("%s(%d):%s tx_hold()\n",
1267                         __FILE__,__LINE__,info->device_name);
1268
1269         spin_lock_irqsave(&info->lock,flags);
1270         if (info->tx_enabled)
1271                 tx_stop(info);
1272         spin_unlock_irqrestore(&info->lock,flags);
1273 }
1274
1275 /* release (start) transmitter
1276  */
1277 static void tx_release(struct tty_struct *tty)
1278 {
1279         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1280         unsigned long flags;
1281
1282         if (sanity_check(info, tty->name, "tx_release"))
1283                 return;
1284
1285         if ( debug_level >= DEBUG_LEVEL_INFO )
1286                 printk("%s(%d):%s tx_release()\n",
1287                         __FILE__,__LINE__,info->device_name);
1288
1289         spin_lock_irqsave(&info->lock,flags);
1290         if (!info->tx_enabled)
1291                 tx_start(info);
1292         spin_unlock_irqrestore(&info->lock,flags);
1293 }
1294
1295 /* Service an IOCTL request
1296  *
1297  * Arguments:
1298  *
1299  *      tty     pointer to tty instance data
1300  *      file    pointer to associated file object for device
1301  *      cmd     IOCTL command code
1302  *      arg     command argument/context
1303  *
1304  * Return Value:        0 if success, otherwise error code
1305  */
1306 static int ioctl(struct tty_struct *tty, struct file *file,
1307                  unsigned int cmd, unsigned long arg)
1308 {
1309         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1310         int error;
1311         struct mgsl_icount cnow;        /* kernel counter temps */
1312         struct serial_icounter_struct __user *p_cuser;  /* user space */
1313         unsigned long flags;
1314         void __user *argp = (void __user *)arg;
1315
1316         if (debug_level >= DEBUG_LEVEL_INFO)
1317                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1318                         info->device_name, cmd );
1319
1320         if (sanity_check(info, tty->name, "ioctl"))
1321                 return -ENODEV;
1322
1323         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1324             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1325                 if (tty->flags & (1 << TTY_IO_ERROR))
1326                     return -EIO;
1327         }
1328
1329         switch (cmd) {
1330         case MGSL_IOCGPARAMS:
1331                 return get_params(info, argp);
1332         case MGSL_IOCSPARAMS:
1333                 return set_params(info, argp);
1334         case MGSL_IOCGTXIDLE:
1335                 return get_txidle(info, argp);
1336         case MGSL_IOCSTXIDLE:
1337                 return set_txidle(info, (int)arg);
1338         case MGSL_IOCTXENABLE:
1339                 return tx_enable(info, (int)arg);
1340         case MGSL_IOCRXENABLE:
1341                 return rx_enable(info, (int)arg);
1342         case MGSL_IOCTXABORT:
1343                 return tx_abort(info);
1344         case MGSL_IOCGSTATS:
1345                 return get_stats(info, argp);
1346         case MGSL_IOCWAITEVENT:
1347                 return wait_mgsl_event(info, argp);
1348         case MGSL_IOCLOOPTXDONE:
1349                 return 0; // TODO: Not supported, need to document
1350                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1351                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1352                  */
1353         case TIOCMIWAIT:
1354                 return modem_input_wait(info,(int)arg);
1355                 
1356                 /*
1357                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1358                  * Return: write counters to the user passed counter struct
1359                  * NB: both 1->0 and 0->1 transitions are counted except for
1360                  *     RI where only 0->1 is counted.
1361                  */
1362         case TIOCGICOUNT:
1363                 spin_lock_irqsave(&info->lock,flags);
1364                 cnow = info->icount;
1365                 spin_unlock_irqrestore(&info->lock,flags);
1366                 p_cuser = argp;
1367                 PUT_USER(error,cnow.cts, &p_cuser->cts);
1368                 if (error) return error;
1369                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1370                 if (error) return error;
1371                 PUT_USER(error,cnow.rng, &p_cuser->rng);
1372                 if (error) return error;
1373                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1374                 if (error) return error;
1375                 PUT_USER(error,cnow.rx, &p_cuser->rx);
1376                 if (error) return error;
1377                 PUT_USER(error,cnow.tx, &p_cuser->tx);
1378                 if (error) return error;
1379                 PUT_USER(error,cnow.frame, &p_cuser->frame);
1380                 if (error) return error;
1381                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1382                 if (error) return error;
1383                 PUT_USER(error,cnow.parity, &p_cuser->parity);
1384                 if (error) return error;
1385                 PUT_USER(error,cnow.brk, &p_cuser->brk);
1386                 if (error) return error;
1387                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1388                 if (error) return error;
1389                 return 0;
1390         default:
1391                 return -ENOIOCTLCMD;
1392         }
1393         return 0;
1394 }
1395
1396 /*
1397  * /proc fs routines....
1398  */
1399
1400 static inline int line_info(char *buf, SLMP_INFO *info)
1401 {
1402         char    stat_buf[30];
1403         int     ret;
1404         unsigned long flags;
1405
1406         ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1407                        "\tIRQ=%d MaxFrameSize=%u\n",
1408                 info->device_name,
1409                 info->phys_sca_base,
1410                 info->phys_memory_base,
1411                 info->phys_statctrl_base,
1412                 info->phys_lcr_base,
1413                 info->irq_level,
1414                 info->max_frame_size );
1415
1416         /* output current serial signal states */
1417         spin_lock_irqsave(&info->lock,flags);
1418         get_signals(info);
1419         spin_unlock_irqrestore(&info->lock,flags);
1420
1421         stat_buf[0] = 0;
1422         stat_buf[1] = 0;
1423         if (info->serial_signals & SerialSignal_RTS)
1424                 strcat(stat_buf, "|RTS");
1425         if (info->serial_signals & SerialSignal_CTS)
1426                 strcat(stat_buf, "|CTS");
1427         if (info->serial_signals & SerialSignal_DTR)
1428                 strcat(stat_buf, "|DTR");
1429         if (info->serial_signals & SerialSignal_DSR)
1430                 strcat(stat_buf, "|DSR");
1431         if (info->serial_signals & SerialSignal_DCD)
1432                 strcat(stat_buf, "|CD");
1433         if (info->serial_signals & SerialSignal_RI)
1434                 strcat(stat_buf, "|RI");
1435
1436         if (info->params.mode == MGSL_MODE_HDLC) {
1437                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1438                               info->icount.txok, info->icount.rxok);
1439                 if (info->icount.txunder)
1440                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1441                 if (info->icount.txabort)
1442                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1443                 if (info->icount.rxshort)
1444                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1445                 if (info->icount.rxlong)
1446                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1447                 if (info->icount.rxover)
1448                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1449                 if (info->icount.rxcrc)
1450                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1451         } else {
1452                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1453                               info->icount.tx, info->icount.rx);
1454                 if (info->icount.frame)
1455                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1456                 if (info->icount.parity)
1457                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1458                 if (info->icount.brk)
1459                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1460                 if (info->icount.overrun)
1461                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1462         }
1463
1464         /* Append serial signal status to end */
1465         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1466
1467         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1468          info->tx_active,info->bh_requested,info->bh_running,
1469          info->pending_bh);
1470
1471         return ret;
1472 }
1473
1474 /* Called to print information about devices
1475  */
1476 int read_proc(char *page, char **start, off_t off, int count,
1477               int *eof, void *data)
1478 {
1479         int len = 0, l;
1480         off_t   begin = 0;
1481         SLMP_INFO *info;
1482
1483         len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1484
1485         info = synclinkmp_device_list;
1486         while( info ) {
1487                 l = line_info(page + len, info);
1488                 len += l;
1489                 if (len+begin > off+count)
1490                         goto done;
1491                 if (len+begin < off) {
1492                         begin += len;
1493                         len = 0;
1494                 }
1495                 info = info->next_device;
1496         }
1497
1498         *eof = 1;
1499 done:
1500         if (off >= len+begin)
1501                 return 0;
1502         *start = page + (off-begin);
1503         return ((count < begin+len-off) ? count : begin+len-off);
1504 }
1505
1506 /* Return the count of bytes in transmit buffer
1507  */
1508 static int chars_in_buffer(struct tty_struct *tty)
1509 {
1510         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1511
1512         if (sanity_check(info, tty->name, "chars_in_buffer"))
1513                 return 0;
1514
1515         if (debug_level >= DEBUG_LEVEL_INFO)
1516                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1517                        __FILE__, __LINE__, info->device_name, info->tx_count);
1518
1519         return info->tx_count;
1520 }
1521
1522 /* Signal remote device to throttle send data (our receive data)
1523  */
1524 static void throttle(struct tty_struct * tty)
1525 {
1526         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1527         unsigned long flags;
1528
1529         if (debug_level >= DEBUG_LEVEL_INFO)
1530                 printk("%s(%d):%s throttle() entry\n",
1531                          __FILE__,__LINE__, info->device_name );
1532
1533         if (sanity_check(info, tty->name, "throttle"))
1534                 return;
1535
1536         if (I_IXOFF(tty))
1537                 send_xchar(tty, STOP_CHAR(tty));
1538
1539         if (tty->termios->c_cflag & CRTSCTS) {
1540                 spin_lock_irqsave(&info->lock,flags);
1541                 info->serial_signals &= ~SerialSignal_RTS;
1542                 set_signals(info);
1543                 spin_unlock_irqrestore(&info->lock,flags);
1544         }
1545 }
1546
1547 /* Signal remote device to stop throttling send data (our receive data)
1548  */
1549 static void unthrottle(struct tty_struct * tty)
1550 {
1551         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1552         unsigned long flags;
1553
1554         if (debug_level >= DEBUG_LEVEL_INFO)
1555                 printk("%s(%d):%s unthrottle() entry\n",
1556                          __FILE__,__LINE__, info->device_name );
1557
1558         if (sanity_check(info, tty->name, "unthrottle"))
1559                 return;
1560
1561         if (I_IXOFF(tty)) {
1562                 if (info->x_char)
1563                         info->x_char = 0;
1564                 else
1565                         send_xchar(tty, START_CHAR(tty));
1566         }
1567
1568         if (tty->termios->c_cflag & CRTSCTS) {
1569                 spin_lock_irqsave(&info->lock,flags);
1570                 info->serial_signals |= SerialSignal_RTS;
1571                 set_signals(info);
1572                 spin_unlock_irqrestore(&info->lock,flags);
1573         }
1574 }
1575
1576 /* set or clear transmit break condition
1577  * break_state  -1=set break condition, 0=clear
1578  */
1579 static void set_break(struct tty_struct *tty, int break_state)
1580 {
1581         unsigned char RegValue;
1582         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1583         unsigned long flags;
1584
1585         if (debug_level >= DEBUG_LEVEL_INFO)
1586                 printk("%s(%d):%s set_break(%d)\n",
1587                          __FILE__,__LINE__, info->device_name, break_state);
1588
1589         if (sanity_check(info, tty->name, "set_break"))
1590                 return;
1591
1592         spin_lock_irqsave(&info->lock,flags);
1593         RegValue = read_reg(info, CTL);
1594         if (break_state == -1)
1595                 RegValue |= BIT3;
1596         else
1597                 RegValue &= ~BIT3;
1598         write_reg(info, CTL, RegValue);
1599         spin_unlock_irqrestore(&info->lock,flags);
1600 }
1601
1602 #if SYNCLINK_GENERIC_HDLC
1603
1604 /**
1605  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1606  * set encoding and frame check sequence (FCS) options
1607  *
1608  * dev       pointer to network device structure
1609  * encoding  serial encoding setting
1610  * parity    FCS setting
1611  *
1612  * returns 0 if success, otherwise error code
1613  */
1614 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1615                           unsigned short parity)
1616 {
1617         SLMP_INFO *info = dev_to_port(dev);
1618         unsigned char  new_encoding;
1619         unsigned short new_crctype;
1620
1621         /* return error if TTY interface open */
1622         if (info->count)
1623                 return -EBUSY;
1624
1625         switch (encoding)
1626         {
1627         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1628         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1629         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1630         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1631         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1632         default: return -EINVAL;
1633         }
1634
1635         switch (parity)
1636         {
1637         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1638         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1639         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1640         default: return -EINVAL;
1641         }
1642
1643         info->params.encoding = new_encoding;
1644         info->params.crc_type = new_crctype;
1645
1646         /* if network interface up, reprogram hardware */
1647         if (info->netcount)
1648                 program_hw(info);
1649
1650         return 0;
1651 }
1652
1653 /**
1654  * called by generic HDLC layer to send frame
1655  *
1656  * skb  socket buffer containing HDLC frame
1657  * dev  pointer to network device structure
1658  *
1659  * returns 0 if success, otherwise error code
1660  */
1661 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1662 {
1663         SLMP_INFO *info = dev_to_port(dev);
1664         struct net_device_stats *stats = hdlc_stats(dev);
1665         unsigned long flags;
1666
1667         if (debug_level >= DEBUG_LEVEL_INFO)
1668                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1669
1670         /* stop sending until this frame completes */
1671         netif_stop_queue(dev);
1672
1673         /* copy data to device buffers */
1674         info->tx_count = skb->len;
1675         tx_load_dma_buffer(info, skb->data, skb->len);
1676
1677         /* update network statistics */
1678         stats->tx_packets++;
1679         stats->tx_bytes += skb->len;
1680
1681         /* done with socket buffer, so free it */
1682         dev_kfree_skb(skb);
1683
1684         /* save start time for transmit timeout detection */
1685         dev->trans_start = jiffies;
1686
1687         /* start hardware transmitter if necessary */
1688         spin_lock_irqsave(&info->lock,flags);
1689         if (!info->tx_active)
1690                 tx_start(info);
1691         spin_unlock_irqrestore(&info->lock,flags);
1692
1693         return 0;
1694 }
1695
1696 /**
1697  * called by network layer when interface enabled
1698  * claim resources and initialize hardware
1699  *
1700  * dev  pointer to network device structure
1701  *
1702  * returns 0 if success, otherwise error code
1703  */
1704 static int hdlcdev_open(struct net_device *dev)
1705 {
1706         SLMP_INFO *info = dev_to_port(dev);
1707         int rc;
1708         unsigned long flags;
1709
1710         if (debug_level >= DEBUG_LEVEL_INFO)
1711                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1712
1713         /* generic HDLC layer open processing */
1714         if ((rc = hdlc_open(dev)))
1715                 return rc;
1716
1717         /* arbitrate between network and tty opens */
1718         spin_lock_irqsave(&info->netlock, flags);
1719         if (info->count != 0 || info->netcount != 0) {
1720                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1721                 spin_unlock_irqrestore(&info->netlock, flags);
1722                 return -EBUSY;
1723         }
1724         info->netcount=1;
1725         spin_unlock_irqrestore(&info->netlock, flags);
1726
1727         /* claim resources and init adapter */
1728         if ((rc = startup(info)) != 0) {
1729                 spin_lock_irqsave(&info->netlock, flags);
1730                 info->netcount=0;
1731                 spin_unlock_irqrestore(&info->netlock, flags);
1732                 return rc;
1733         }
1734
1735         /* assert DTR and RTS, apply hardware settings */
1736         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1737         program_hw(info);
1738
1739         /* enable network layer transmit */
1740         dev->trans_start = jiffies;
1741         netif_start_queue(dev);
1742
1743         /* inform generic HDLC layer of current DCD status */
1744         spin_lock_irqsave(&info->lock, flags);
1745         get_signals(info);
1746         spin_unlock_irqrestore(&info->lock, flags);
1747         if (info->serial_signals & SerialSignal_DCD)
1748                 netif_carrier_on(dev);
1749         else
1750                 netif_carrier_off(dev);
1751         return 0;
1752 }
1753
1754 /**
1755  * called by network layer when interface is disabled
1756  * shutdown hardware and release resources
1757  *
1758  * dev  pointer to network device structure
1759  *
1760  * returns 0 if success, otherwise error code
1761  */
1762 static int hdlcdev_close(struct net_device *dev)
1763 {
1764         SLMP_INFO *info = dev_to_port(dev);
1765         unsigned long flags;
1766
1767         if (debug_level >= DEBUG_LEVEL_INFO)
1768                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1769
1770         netif_stop_queue(dev);
1771
1772         /* shutdown adapter and release resources */
1773         shutdown(info);
1774
1775         hdlc_close(dev);
1776
1777         spin_lock_irqsave(&info->netlock, flags);
1778         info->netcount=0;
1779         spin_unlock_irqrestore(&info->netlock, flags);
1780
1781         return 0;
1782 }
1783
1784 /**
1785  * called by network layer to process IOCTL call to network device
1786  *
1787  * dev  pointer to network device structure
1788  * ifr  pointer to network interface request structure
1789  * cmd  IOCTL command code
1790  *
1791  * returns 0 if success, otherwise error code
1792  */
1793 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1794 {
1795         const size_t size = sizeof(sync_serial_settings);
1796         sync_serial_settings new_line;
1797         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1798         SLMP_INFO *info = dev_to_port(dev);
1799         unsigned int flags;
1800
1801         if (debug_level >= DEBUG_LEVEL_INFO)
1802                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1803
1804         /* return error if TTY interface open */
1805         if (info->count)
1806                 return -EBUSY;
1807
1808         if (cmd != SIOCWANDEV)
1809                 return hdlc_ioctl(dev, ifr, cmd);
1810
1811         switch(ifr->ifr_settings.type) {
1812         case IF_GET_IFACE: /* return current sync_serial_settings */
1813
1814                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1815                 if (ifr->ifr_settings.size < size) {
1816                         ifr->ifr_settings.size = size; /* data size wanted */
1817                         return -ENOBUFS;
1818                 }
1819
1820                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1821                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1822                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1823                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1824
1825                 switch (flags){
1826                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1827                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1828                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1829                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1830                 default: new_line.clock_type = CLOCK_DEFAULT;
1831                 }
1832
1833                 new_line.clock_rate = info->params.clock_speed;
1834                 new_line.loopback   = info->params.loopback ? 1:0;
1835
1836                 if (copy_to_user(line, &new_line, size))
1837                         return -EFAULT;
1838                 return 0;
1839
1840         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1841
1842                 if(!capable(CAP_NET_ADMIN))
1843                         return -EPERM;
1844                 if (copy_from_user(&new_line, line, size))
1845                         return -EFAULT;
1846
1847                 switch (new_line.clock_type)
1848                 {
1849                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1850                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1851                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1852                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1853                 case CLOCK_DEFAULT:  flags = info->params.flags &
1854                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1855                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1856                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1857                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1858                 default: return -EINVAL;
1859                 }
1860
1861                 if (new_line.loopback != 0 && new_line.loopback != 1)
1862                         return -EINVAL;
1863
1864                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1865                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1866                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1867                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1868                 info->params.flags |= flags;
1869
1870                 info->params.loopback = new_line.loopback;
1871
1872                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1873                         info->params.clock_speed = new_line.clock_rate;
1874                 else
1875                         info->params.clock_speed = 0;
1876
1877                 /* if network interface up, reprogram hardware */
1878                 if (info->netcount)
1879                         program_hw(info);
1880                 return 0;
1881
1882         default:
1883                 return hdlc_ioctl(dev, ifr, cmd);
1884         }
1885 }
1886
1887 /**
1888  * called by network layer when transmit timeout is detected
1889  *
1890  * dev  pointer to network device structure
1891  */
1892 static void hdlcdev_tx_timeout(struct net_device *dev)
1893 {
1894         SLMP_INFO *info = dev_to_port(dev);
1895         struct net_device_stats *stats = hdlc_stats(dev);
1896         unsigned long flags;
1897
1898         if (debug_level >= DEBUG_LEVEL_INFO)
1899                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1900
1901         stats->tx_errors++;
1902         stats->tx_aborted_errors++;
1903
1904         spin_lock_irqsave(&info->lock,flags);
1905         tx_stop(info);
1906         spin_unlock_irqrestore(&info->lock,flags);
1907
1908         netif_wake_queue(dev);
1909 }
1910
1911 /**
1912  * called by device driver when transmit completes
1913  * reenable network layer transmit if stopped
1914  *
1915  * info  pointer to device instance information
1916  */
1917 static void hdlcdev_tx_done(SLMP_INFO *info)
1918 {
1919         if (netif_queue_stopped(info->netdev))
1920                 netif_wake_queue(info->netdev);
1921 }
1922
1923 /**
1924  * called by device driver when frame received
1925  * pass frame to network layer
1926  *
1927  * info  pointer to device instance information
1928  * buf   pointer to buffer contianing frame data
1929  * size  count of data bytes in buf
1930  */
1931 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1932 {
1933         struct sk_buff *skb = dev_alloc_skb(size);
1934         struct net_device *dev = info->netdev;
1935         struct net_device_stats *stats = hdlc_stats(dev);
1936
1937         if (debug_level >= DEBUG_LEVEL_INFO)
1938                 printk("hdlcdev_rx(%s)\n",dev->name);
1939
1940         if (skb == NULL) {
1941                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
1942                 stats->rx_dropped++;
1943                 return;
1944         }
1945
1946         memcpy(skb_put(skb, size),buf,size);
1947
1948         skb->protocol = hdlc_type_trans(skb, info->netdev);
1949
1950         stats->rx_packets++;
1951         stats->rx_bytes += size;
1952
1953         netif_rx(skb);
1954
1955         info->netdev->last_rx = jiffies;
1956 }
1957
1958 /**
1959  * called by device driver when adding device instance
1960  * do generic HDLC initialization
1961  *
1962  * info  pointer to device instance information
1963  *
1964  * returns 0 if success, otherwise error code
1965  */
1966 static int hdlcdev_init(SLMP_INFO *info)
1967 {
1968         int rc;
1969         struct net_device *dev;
1970         hdlc_device *hdlc;
1971
1972         /* allocate and initialize network and HDLC layer objects */
1973
1974         if (!(dev = alloc_hdlcdev(info))) {
1975                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1976                 return -ENOMEM;
1977         }
1978
1979         /* for network layer reporting purposes only */
1980         dev->mem_start = info->phys_sca_base;
1981         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1982         dev->irq       = info->irq_level;
1983
1984         /* network layer callbacks and settings */
1985         dev->do_ioctl       = hdlcdev_ioctl;
1986         dev->open           = hdlcdev_open;
1987         dev->stop           = hdlcdev_close;
1988         dev->tx_timeout     = hdlcdev_tx_timeout;
1989         dev->watchdog_timeo = 10*HZ;
1990         dev->tx_queue_len   = 50;
1991
1992         /* generic HDLC layer callbacks and settings */
1993         hdlc         = dev_to_hdlc(dev);
1994         hdlc->attach = hdlcdev_attach;
1995         hdlc->xmit   = hdlcdev_xmit;
1996
1997         /* register objects with HDLC layer */
1998         if ((rc = register_hdlc_device(dev))) {
1999                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2000                 free_netdev(dev);
2001                 return rc;
2002         }
2003
2004         info->netdev = dev;
2005         return 0;
2006 }
2007
2008 /**
2009  * called by device driver when removing device instance
2010  * do generic HDLC cleanup
2011  *
2012  * info  pointer to device instance information
2013  */
2014 static void hdlcdev_exit(SLMP_INFO *info)
2015 {
2016         unregister_hdlc_device(info->netdev);
2017         free_netdev(info->netdev);
2018         info->netdev = NULL;
2019 }
2020
2021 #endif /* CONFIG_HDLC */
2022
2023
2024 /* Return next bottom half action to perform.
2025  * Return Value:        BH action code or 0 if nothing to do.
2026  */
2027 int bh_action(SLMP_INFO *info)
2028 {
2029         unsigned long flags;
2030         int rc = 0;
2031
2032         spin_lock_irqsave(&info->lock,flags);
2033
2034         if (info->pending_bh & BH_RECEIVE) {
2035                 info->pending_bh &= ~BH_RECEIVE;
2036                 rc = BH_RECEIVE;
2037         } else if (info->pending_bh & BH_TRANSMIT) {
2038                 info->pending_bh &= ~BH_TRANSMIT;
2039                 rc = BH_TRANSMIT;
2040         } else if (info->pending_bh & BH_STATUS) {
2041                 info->pending_bh &= ~BH_STATUS;
2042                 rc = BH_STATUS;
2043         }
2044
2045         if (!rc) {
2046                 /* Mark BH routine as complete */
2047                 info->bh_running   = 0;
2048                 info->bh_requested = 0;
2049         }
2050
2051         spin_unlock_irqrestore(&info->lock,flags);
2052
2053         return rc;
2054 }
2055
2056 /* Perform bottom half processing of work items queued by ISR.
2057  */
2058 void bh_handler(struct work_struct *work)
2059 {
2060         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2061         int action;
2062
2063         if (!info)
2064                 return;
2065
2066         if ( debug_level >= DEBUG_LEVEL_BH )
2067                 printk( "%s(%d):%s bh_handler() entry\n",
2068                         __FILE__,__LINE__,info->device_name);
2069
2070         info->bh_running = 1;
2071
2072         while((action = bh_action(info)) != 0) {
2073
2074                 /* Process work item */
2075                 if ( debug_level >= DEBUG_LEVEL_BH )
2076                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2077                                 __FILE__,__LINE__,info->device_name, action);
2078
2079                 switch (action) {
2080
2081                 case BH_RECEIVE:
2082                         bh_receive(info);
2083                         break;
2084                 case BH_TRANSMIT:
2085                         bh_transmit(info);
2086                         break;
2087                 case BH_STATUS:
2088                         bh_status(info);
2089                         break;
2090                 default:
2091                         /* unknown work item ID */
2092                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2093                                 __FILE__,__LINE__,info->device_name,action);
2094                         break;
2095                 }
2096         }
2097
2098         if ( debug_level >= DEBUG_LEVEL_BH )
2099                 printk( "%s(%d):%s bh_handler() exit\n",
2100                         __FILE__,__LINE__,info->device_name);
2101 }
2102
2103 void bh_receive(SLMP_INFO *info)
2104 {
2105         if ( debug_level >= DEBUG_LEVEL_BH )
2106                 printk( "%s(%d):%s bh_receive()\n",
2107                         __FILE__,__LINE__,info->device_name);
2108
2109         while( rx_get_frame(info) );
2110 }
2111
2112 void bh_transmit(SLMP_INFO *info)
2113 {
2114         struct tty_struct *tty = info->tty;
2115
2116         if ( debug_level >= DEBUG_LEVEL_BH )
2117                 printk( "%s(%d):%s bh_transmit() entry\n",
2118                         __FILE__,__LINE__,info->device_name);
2119
2120         if (tty)
2121                 tty_wakeup(tty);
2122 }
2123
2124 void bh_status(SLMP_INFO *info)
2125 {
2126         if ( debug_level >= DEBUG_LEVEL_BH )
2127                 printk( "%s(%d):%s bh_status() entry\n",
2128                         __FILE__,__LINE__,info->device_name);
2129
2130         info->ri_chkcount = 0;
2131         info->dsr_chkcount = 0;
2132         info->dcd_chkcount = 0;
2133         info->cts_chkcount = 0;
2134 }
2135
2136 void isr_timer(SLMP_INFO * info)
2137 {
2138         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2139
2140         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2141         write_reg(info, IER2, 0);
2142
2143         /* TMCS, Timer Control/Status Register
2144          *
2145          * 07      CMF, Compare match flag (read only) 1=match
2146          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2147          * 05      Reserved, must be 0
2148          * 04      TME, Timer Enable
2149          * 03..00  Reserved, must be 0
2150          *
2151          * 0000 0000
2152          */
2153         write_reg(info, (unsigned char)(timer + TMCS), 0);
2154
2155         info->irq_occurred = TRUE;
2156
2157         if ( debug_level >= DEBUG_LEVEL_ISR )
2158                 printk("%s(%d):%s isr_timer()\n",
2159                         __FILE__,__LINE__,info->device_name);
2160 }
2161
2162 void isr_rxint(SLMP_INFO * info)
2163 {
2164         struct tty_struct *tty = info->tty;
2165         struct  mgsl_icount *icount = &info->icount;
2166         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2167         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2168
2169         /* clear status bits */
2170         if (status)
2171                 write_reg(info, SR1, status);
2172
2173         if (status2)
2174                 write_reg(info, SR2, status2);
2175         
2176         if ( debug_level >= DEBUG_LEVEL_ISR )
2177                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2178                         __FILE__,__LINE__,info->device_name,status,status2);
2179
2180         if (info->params.mode == MGSL_MODE_ASYNC) {
2181                 if (status & BRKD) {
2182                         icount->brk++;
2183
2184                         /* process break detection if tty control
2185                          * is not set to ignore it
2186                          */
2187                         if ( tty ) {
2188                                 if (!(status & info->ignore_status_mask1)) {
2189                                         if (info->read_status_mask1 & BRKD) {
2190                                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
2191                                                 if (info->flags & ASYNC_SAK)
2192                                                         do_SAK(tty);
2193                                         }
2194                                 }
2195                         }
2196                 }
2197         }
2198         else {
2199                 if (status & (FLGD|IDLD)) {
2200                         if (status & FLGD)
2201                                 info->icount.exithunt++;
2202                         else if (status & IDLD)
2203                                 info->icount.rxidle++;
2204                         wake_up_interruptible(&info->event_wait_q);
2205                 }
2206         }
2207
2208         if (status & CDCD) {
2209                 /* simulate a common modem status change interrupt
2210                  * for our handler
2211                  */
2212                 get_signals( info );
2213                 isr_io_pin(info,
2214                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2215         }
2216 }
2217
2218 /*
2219  * handle async rx data interrupts
2220  */
2221 void isr_rxrdy(SLMP_INFO * info)
2222 {
2223         u16 status;
2224         unsigned char DataByte;
2225         struct tty_struct *tty = info->tty;
2226         struct  mgsl_icount *icount = &info->icount;
2227
2228         if ( debug_level >= DEBUG_LEVEL_ISR )
2229                 printk("%s(%d):%s isr_rxrdy\n",
2230                         __FILE__,__LINE__,info->device_name);
2231
2232         while((status = read_reg(info,CST0)) & BIT0)
2233         {
2234                 int flag = 0;
2235                 int over = 0;
2236                 DataByte = read_reg(info,TRB);
2237
2238                 icount->rx++;
2239
2240                 if ( status & (PE + FRME + OVRN) ) {
2241                         printk("%s(%d):%s rxerr=%04X\n",
2242                                 __FILE__,__LINE__,info->device_name,status);
2243
2244                         /* update error statistics */
2245                         if (status & PE)
2246                                 icount->parity++;
2247                         else if (status & FRME)
2248                                 icount->frame++;
2249                         else if (status & OVRN)
2250                                 icount->overrun++;
2251
2252                         /* discard char if tty control flags say so */
2253                         if (status & info->ignore_status_mask2)
2254                                 continue;
2255
2256                         status &= info->read_status_mask2;
2257
2258                         if ( tty ) {
2259                                 if (status & PE)
2260                                         flag = TTY_PARITY;
2261                                 else if (status & FRME)
2262                                         flag = TTY_FRAME;
2263                                 if (status & OVRN) {
2264                                         /* Overrun is special, since it's
2265                                          * reported immediately, and doesn't
2266                                          * affect the current character
2267                                          */
2268                                         over = 1;
2269                                 }
2270                         }
2271                 }       /* end of if (error) */
2272
2273                 if ( tty ) {
2274                         tty_insert_flip_char(tty, DataByte, flag);
2275                         if (over)
2276                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2277                 }
2278         }
2279
2280         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2281                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2282                         __FILE__,__LINE__,info->device_name,
2283                         icount->rx,icount->brk,icount->parity,
2284                         icount->frame,icount->overrun);
2285         }
2286
2287         if ( tty )
2288                 tty_flip_buffer_push(tty);
2289 }
2290
2291 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2292 {
2293         if ( debug_level >= DEBUG_LEVEL_ISR )
2294                 printk("%s(%d):%s isr_txeom status=%02x\n",
2295                         __FILE__,__LINE__,info->device_name,status);
2296
2297         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2298         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2299         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2300
2301         if (status & UDRN) {
2302                 write_reg(info, CMD, TXRESET);
2303                 write_reg(info, CMD, TXENABLE);
2304         } else
2305                 write_reg(info, CMD, TXBUFCLR);
2306
2307         /* disable and clear tx interrupts */
2308         info->ie0_value &= ~TXRDYE;
2309         info->ie1_value &= ~(IDLE + UDRN);
2310         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2311         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2312
2313         if ( info->tx_active ) {
2314                 if (info->params.mode != MGSL_MODE_ASYNC) {
2315                         if (status & UDRN)
2316                                 info->icount.txunder++;
2317                         else if (status & IDLE)
2318                                 info->icount.txok++;
2319                 }
2320
2321                 info->tx_active = 0;
2322                 info->tx_count = info->tx_put = info->tx_get = 0;
2323
2324                 del_timer(&info->tx_timer);
2325
2326                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2327                         info->serial_signals &= ~SerialSignal_RTS;
2328                         info->drop_rts_on_tx_done = 0;
2329                         set_signals(info);
2330                 }
2331
2332 #if SYNCLINK_GENERIC_HDLC
2333                 if (info->netcount)
2334                         hdlcdev_tx_done(info);
2335                 else
2336 #endif
2337                 {
2338                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2339                                 tx_stop(info);
2340                                 return;
2341                         }
2342                         info->pending_bh |= BH_TRANSMIT;
2343                 }
2344         }
2345 }
2346
2347
2348 /*
2349  * handle tx status interrupts
2350  */
2351 void isr_txint(SLMP_INFO * info)
2352 {
2353         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2354
2355         /* clear status bits */
2356         write_reg(info, SR1, status);
2357
2358         if ( debug_level >= DEBUG_LEVEL_ISR )
2359                 printk("%s(%d):%s isr_txint status=%02x\n",
2360                         __FILE__,__LINE__,info->device_name,status);
2361
2362         if (status & (UDRN + IDLE))
2363                 isr_txeom(info, status);
2364
2365         if (status & CCTS) {
2366                 /* simulate a common modem status change interrupt
2367                  * for our handler
2368                  */
2369                 get_signals( info );
2370                 isr_io_pin(info,
2371                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2372
2373         }
2374 }
2375
2376 /*
2377  * handle async tx data interrupts
2378  */
2379 void isr_txrdy(SLMP_INFO * info)
2380 {
2381         if ( debug_level >= DEBUG_LEVEL_ISR )
2382                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2383                         __FILE__,__LINE__,info->device_name,info->tx_count);
2384
2385         if (info->params.mode != MGSL_MODE_ASYNC) {
2386                 /* disable TXRDY IRQ, enable IDLE IRQ */
2387                 info->ie0_value &= ~TXRDYE;
2388                 info->ie1_value |= IDLE;
2389                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2390                 return;
2391         }
2392
2393         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2394                 tx_stop(info);
2395                 return;
2396         }
2397
2398         if ( info->tx_count )
2399                 tx_load_fifo( info );
2400         else {
2401                 info->tx_active = 0;
2402                 info->ie0_value &= ~TXRDYE;
2403                 write_reg(info, IE0, info->ie0_value);
2404         }
2405
2406         if (info->tx_count < WAKEUP_CHARS)
2407                 info->pending_bh |= BH_TRANSMIT;
2408 }
2409
2410 void isr_rxdmaok(SLMP_INFO * info)
2411 {
2412         /* BIT7 = EOT (end of transfer)
2413          * BIT6 = EOM (end of message/frame)
2414          */
2415         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2416
2417         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2418         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2419
2420         if ( debug_level >= DEBUG_LEVEL_ISR )
2421                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2422                         __FILE__,__LINE__,info->device_name,status);
2423
2424         info->pending_bh |= BH_RECEIVE;
2425 }
2426
2427 void isr_rxdmaerror(SLMP_INFO * info)
2428 {
2429         /* BIT5 = BOF (buffer overflow)
2430          * BIT4 = COF (counter overflow)
2431          */
2432         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2433
2434         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2435         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2436
2437         if ( debug_level >= DEBUG_LEVEL_ISR )
2438                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2439                         __FILE__,__LINE__,info->device_name,status);
2440
2441         info->rx_overflow = TRUE;
2442         info->pending_bh |= BH_RECEIVE;
2443 }
2444
2445 void isr_txdmaok(SLMP_INFO * info)
2446 {
2447         unsigned char status_reg1 = read_reg(info, SR1);
2448
2449         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2450         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2451         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2452
2453         if ( debug_level >= DEBUG_LEVEL_ISR )
2454                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2455                         __FILE__,__LINE__,info->device_name,status_reg1);
2456
2457         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2458         write_reg16(info, TRC0, 0);
2459         info->ie0_value |= TXRDYE;
2460         write_reg(info, IE0, info->ie0_value);
2461 }
2462
2463 void isr_txdmaerror(SLMP_INFO * info)
2464 {
2465         /* BIT5 = BOF (buffer overflow)
2466          * BIT4 = COF (counter overflow)
2467          */
2468         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2469
2470         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2471         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2472
2473         if ( debug_level >= DEBUG_LEVEL_ISR )
2474                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2475                         __FILE__,__LINE__,info->device_name,status);
2476 }
2477
2478 /* handle input serial signal changes
2479  */
2480 void isr_io_pin( SLMP_INFO *info, u16 status )
2481 {
2482         struct  mgsl_icount *icount;
2483
2484         if ( debug_level >= DEBUG_LEVEL_ISR )
2485                 printk("%s(%d):isr_io_pin status=%04X\n",
2486                         __FILE__,__LINE__,status);
2487
2488         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2489                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2490                 icount = &info->icount;
2491                 /* update input line counters */
2492                 if (status & MISCSTATUS_RI_LATCHED) {
2493                         icount->rng++;
2494                         if ( status & SerialSignal_RI )
2495                                 info->input_signal_events.ri_up++;
2496                         else
2497                                 info->input_signal_events.ri_down++;
2498                 }
2499                 if (status & MISCSTATUS_DSR_LATCHED) {
2500                         icount->dsr++;
2501                         if ( status & SerialSignal_DSR )
2502                                 info->input_signal_events.dsr_up++;
2503                         else
2504                                 info->input_signal_events.dsr_down++;
2505                 }
2506                 if (status & MISCSTATUS_DCD_LATCHED) {
2507                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2508                                 info->ie1_value &= ~CDCD;
2509                                 write_reg(info, IE1, info->ie1_value);
2510                         }
2511                         icount->dcd++;
2512                         if (status & SerialSignal_DCD) {
2513                                 info->input_signal_events.dcd_up++;
2514                         } else
2515                                 info->input_signal_events.dcd_down++;
2516 #if SYNCLINK_GENERIC_HDLC
2517                         if (info->netcount) {
2518                                 if (status & SerialSignal_DCD)
2519                                         netif_carrier_on(info->netdev);
2520                                 else
2521                                         netif_carrier_off(info->netdev);
2522                         }
2523 #endif
2524                 }
2525                 if (status & MISCSTATUS_CTS_LATCHED)
2526                 {
2527                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2528                                 info->ie1_value &= ~CCTS;
2529                                 write_reg(info, IE1, info->ie1_value);
2530                         }
2531                         icount->cts++;
2532                         if ( status & SerialSignal_CTS )
2533                                 info->input_signal_events.cts_up++;
2534                         else
2535                                 info->input_signal_events.cts_down++;
2536                 }
2537                 wake_up_interruptible(&info->status_event_wait_q);
2538                 wake_up_interruptible(&info->event_wait_q);
2539
2540                 if ( (info->flags & ASYNC_CHECK_CD) &&
2541                      (status & MISCSTATUS_DCD_LATCHED) ) {
2542                         if ( debug_level >= DEBUG_LEVEL_ISR )
2543                                 printk("%s CD now %s...", info->device_name,
2544                                        (status & SerialSignal_DCD) ? "on" : "off");
2545                         if (status & SerialSignal_DCD)
2546                                 wake_up_interruptible(&info->open_wait);
2547                         else {
2548                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2549                                         printk("doing serial hangup...");
2550                                 if (info->tty)
2551                                         tty_hangup(info->tty);
2552                         }
2553                 }
2554
2555                 if ( (info->flags & ASYNC_CTS_FLOW) &&
2556                      (status & MISCSTATUS_CTS_LATCHED) ) {
2557                         if ( info->tty ) {
2558                                 if (info->tty->hw_stopped) {
2559                                         if (status & SerialSignal_CTS) {
2560                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2561                                                         printk("CTS tx start...");
2562                                                 info->tty->hw_stopped = 0;
2563                                                 tx_start(info);
2564                                                 info->pending_bh |= BH_TRANSMIT;
2565                                                 return;
2566                                         }
2567                                 } else {
2568                                         if (!(status & SerialSignal_CTS)) {
2569                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2570                                                         printk("CTS tx stop...");
2571                                                 info->tty->hw_stopped = 1;
2572                                                 tx_stop(info);
2573                                         }
2574                                 }
2575                         }
2576                 }
2577         }
2578
2579         info->pending_bh |= BH_STATUS;
2580 }
2581
2582 /* Interrupt service routine entry point.
2583  *
2584  * Arguments:
2585  *      irq             interrupt number that caused interrupt
2586  *      dev_id          device ID supplied during interrupt registration
2587  *      regs            interrupted processor context
2588  */
2589 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2590 {
2591         SLMP_INFO *info = dev_id;
2592         unsigned char status, status0, status1=0;
2593         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2594         unsigned char timerstatus0, timerstatus1=0;
2595         unsigned char shift;
2596         unsigned int i;
2597         unsigned short tmp;
2598
2599         if ( debug_level >= DEBUG_LEVEL_ISR )
2600                 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2601                         __FILE__, __LINE__, info->irq_level);
2602
2603         spin_lock(&info->lock);
2604
2605         for(;;) {
2606
2607                 /* get status for SCA0 (ports 0-1) */
2608                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2609                 status0 = (unsigned char)tmp;
2610                 dmastatus0 = (unsigned char)(tmp>>8);
2611                 timerstatus0 = read_reg(info, ISR2);
2612
2613                 if ( debug_level >= DEBUG_LEVEL_ISR )
2614                         printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2615                                 __FILE__, __LINE__, info->device_name,
2616                                 status0, dmastatus0, timerstatus0);
2617
2618                 if (info->port_count == 4) {
2619                         /* get status for SCA1 (ports 2-3) */
2620                         tmp = read_reg16(info->port_array[2], ISR0);
2621                         status1 = (unsigned char)tmp;
2622                         dmastatus1 = (unsigned char)(tmp>>8);
2623                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2624
2625                         if ( debug_level >= DEBUG_LEVEL_ISR )
2626                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2627                                         __FILE__,__LINE__,info->device_name,
2628                                         status1,dmastatus1,timerstatus1);
2629                 }
2630
2631                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2632                          !status1 && !dmastatus1 && !timerstatus1)
2633                         break;
2634
2635                 for(i=0; i < info->port_count ; i++) {
2636                         if (info->port_array[i] == NULL)
2637                                 continue;
2638                         if (i < 2) {
2639                                 status = status0;
2640                                 dmastatus = dmastatus0;
2641                         } else {
2642                                 status = status1;
2643                                 dmastatus = dmastatus1;
2644                         }
2645
2646                         shift = i & 1 ? 4 :0;
2647
2648                         if (status & BIT0 << shift)
2649                                 isr_rxrdy(info->port_array[i]);
2650                         if (status & BIT1 << shift)
2651                                 isr_txrdy(info->port_array[i]);
2652                         if (status & BIT2 << shift)
2653                                 isr_rxint(info->port_array[i]);
2654                         if (status & BIT3 << shift)
2655                                 isr_txint(info->port_array[i]);
2656
2657                         if (dmastatus & BIT0 << shift)
2658                                 isr_rxdmaerror(info->port_array[i]);
2659                         if (dmastatus & BIT1 << shift)
2660                                 isr_rxdmaok(info->port_array[i]);
2661                         if (dmastatus & BIT2 << shift)
2662                                 isr_txdmaerror(info->port_array[i]);
2663                         if (dmastatus & BIT3 << shift)
2664                                 isr_txdmaok(info->port_array[i]);
2665                 }
2666
2667                 if (timerstatus0 & (BIT5 | BIT4))
2668                         isr_timer(info->port_array[0]);
2669                 if (timerstatus0 & (BIT7 | BIT6))
2670                         isr_timer(info->port_array[1]);
2671                 if (timerstatus1 & (BIT5 | BIT4))
2672                         isr_timer(info->port_array[2]);
2673                 if (timerstatus1 & (BIT7 | BIT6))
2674                         isr_timer(info->port_array[3]);
2675         }
2676
2677         for(i=0; i < info->port_count ; i++) {
2678                 SLMP_INFO * port = info->port_array[i];
2679
2680                 /* Request bottom half processing if there's something
2681                  * for it to do and the bh is not already running.
2682                  *
2683                  * Note: startup adapter diags require interrupts.
2684                  * do not request bottom half processing if the
2685                  * device is not open in a normal mode.
2686                  */
2687                 if ( port && (port->count || port->netcount) &&
2688                      port->pending_bh && !port->bh_running &&
2689                      !port->bh_requested ) {
2690                         if ( debug_level >= DEBUG_LEVEL_ISR )
2691                                 printk("%s(%d):%s queueing bh task.\n",
2692                                         __FILE__,__LINE__,port->device_name);
2693                         schedule_work(&port->task);
2694                         port->bh_requested = 1;
2695                 }
2696         }
2697
2698         spin_unlock(&info->lock);
2699
2700         if ( debug_level >= DEBUG_LEVEL_ISR )
2701                 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2702                         __FILE__, __LINE__, info->irq_level);
2703         return IRQ_HANDLED;
2704 }
2705
2706 /* Initialize and start device.
2707  */
2708 static int startup(SLMP_INFO * info)
2709 {
2710         if ( debug_level >= DEBUG_LEVEL_INFO )
2711                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2712
2713         if (info->flags & ASYNC_INITIALIZED)
2714                 return 0;
2715
2716         if (!info->tx_buf) {
2717                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2718                 if (!info->tx_buf) {
2719                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2720                                 __FILE__,__LINE__,info->device_name);
2721                         return -ENOMEM;
2722                 }
2723         }
2724
2725         info->pending_bh = 0;
2726
2727         memset(&info->icount, 0, sizeof(info->icount));
2728
2729         /* program hardware for current parameters */
2730         reset_port(info);
2731
2732         change_params(info);
2733
2734         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2735
2736         if (info->tty)
2737                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2738
2739         info->flags |= ASYNC_INITIALIZED;
2740
2741         return 0;
2742 }
2743
2744 /* Called by close() and hangup() to shutdown hardware
2745  */
2746 static void shutdown(SLMP_INFO * info)
2747 {
2748         unsigned long flags;
2749
2750         if (!(info->flags & ASYNC_INITIALIZED))
2751                 return;
2752
2753         if (debug_level >= DEBUG_LEVEL_INFO)
2754                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2755                          __FILE__,__LINE__, info->device_name );
2756
2757         /* clear status wait queue because status changes */
2758         /* can't happen after shutting down the hardware */
2759         wake_up_interruptible(&info->status_event_wait_q);
2760         wake_up_interruptible(&info->event_wait_q);
2761
2762         del_timer(&info->tx_timer);
2763         del_timer(&info->status_timer);
2764
2765         kfree(info->tx_buf);
2766         info->tx_buf = NULL;
2767
2768         spin_lock_irqsave(&info->lock,flags);
2769
2770         reset_port(info);
2771
2772         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2773                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2774                 set_signals(info);
2775         }
2776
2777         spin_unlock_irqrestore(&info->lock,flags);
2778
2779         if (info->tty)
2780                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2781
2782         info->flags &= ~ASYNC_INITIALIZED;
2783 }
2784
2785 static void program_hw(SLMP_INFO *info)
2786 {
2787         unsigned long flags;
2788
2789         spin_lock_irqsave(&info->lock,flags);
2790
2791         rx_stop(info);
2792         tx_stop(info);
2793
2794         info->tx_count = info->tx_put = info->tx_get = 0;
2795
2796         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2797                 hdlc_mode(info);
2798         else
2799                 async_mode(info);
2800
2801         set_signals(info);
2802
2803         info->dcd_chkcount = 0;
2804         info->cts_chkcount = 0;
2805         info->ri_chkcount = 0;
2806         info->dsr_chkcount = 0;
2807
2808         info->ie1_value |= (CDCD|CCTS);
2809         write_reg(info, IE1, info->ie1_value);
2810
2811         get_signals(info);
2812
2813         if (info->netcount || (info->tty && info->tty->termios->c_cflag & CREAD) )
2814                 rx_start(info);
2815
2816         spin_unlock_irqrestore(&info->lock,flags);
2817 }
2818
2819 /* Reconfigure adapter based on new parameters
2820  */
2821 static void change_params(SLMP_INFO *info)
2822 {
2823         unsigned cflag;
2824         int bits_per_char;
2825
2826         if (!info->tty || !info->tty->termios)
2827                 return;
2828
2829         if (debug_level >= DEBUG_LEVEL_INFO)
2830                 printk("%s(%d):%s change_params()\n",
2831                          __FILE__,__LINE__, info->device_name );
2832
2833         cflag = info->tty->termios->c_cflag;
2834
2835         /* if B0 rate (hangup) specified then negate DTR and RTS */
2836         /* otherwise assert DTR and RTS */
2837         if (cflag & CBAUD)
2838                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2839         else
2840                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2841
2842         /* byte size and parity */
2843
2844         switch (cflag & CSIZE) {
2845               case CS5: info->params.data_bits = 5; break;
2846               case CS6: info->params.data_bits = 6; break;
2847               case CS7: info->params.data_bits = 7; break;
2848               case CS8: info->params.data_bits = 8; break;
2849               /* Never happens, but GCC is too dumb to figure it out */
2850               default:  info->params.data_bits = 7; break;
2851               }
2852
2853         if (cflag & CSTOPB)
2854                 info->params.stop_bits = 2;
2855         else
2856                 info->params.stop_bits = 1;
2857
2858         info->params.parity = ASYNC_PARITY_NONE;
2859         if (cflag & PARENB) {
2860                 if (cflag & PARODD)
2861                         info->params.parity = ASYNC_PARITY_ODD;
2862                 else
2863                         info->params.parity = ASYNC_PARITY_EVEN;
2864 #ifdef CMSPAR
2865                 if (cflag & CMSPAR)
2866                         info->params.parity = ASYNC_PARITY_SPACE;
2867 #endif
2868         }
2869
2870         /* calculate number of jiffies to transmit a full
2871          * FIFO (32 bytes) at specified data rate
2872          */
2873         bits_per_char = info->params.data_bits +
2874                         info->params.stop_bits + 1;
2875
2876         /* if port data rate is set to 460800 or less then
2877          * allow tty settings to override, otherwise keep the
2878          * current data rate.
2879          */
2880         if (info->params.data_rate <= 460800) {
2881                 info->params.data_rate = tty_get_baud_rate(info->tty);
2882         }
2883
2884         if ( info->params.data_rate ) {
2885                 info->timeout = (32*HZ*bits_per_char) /
2886                                 info->params.data_rate;
2887         }
2888         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2889
2890         if (cflag & CRTSCTS)
2891                 info->flags |= ASYNC_CTS_FLOW;
2892         else
2893                 info->flags &= ~ASYNC_CTS_FLOW;
2894
2895         if (cflag & CLOCAL)
2896                 info->flags &= ~ASYNC_CHECK_CD;
2897         else
2898                 info->flags |= ASYNC_CHECK_CD;
2899
2900         /* process tty input control flags */
2901
2902         info->read_status_mask2 = OVRN;
2903         if (I_INPCK(info->tty))
2904                 info->read_status_mask2 |= PE | FRME;
2905         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2906                 info->read_status_mask1 |= BRKD;
2907         if (I_IGNPAR(info->tty))
2908                 info->ignore_status_mask2 |= PE | FRME;
2909         if (I_IGNBRK(info->tty)) {
2910                 info->ignore_status_mask1 |= BRKD;
2911                 /* If ignoring parity and break indicators, ignore
2912                  * overruns too.  (For real raw support).
2913                  */
2914                 if (I_IGNPAR(info->tty))
2915                         info->ignore_status_mask2 |= OVRN;
2916         }
2917
2918         program_hw(info);
2919 }
2920
2921 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2922 {
2923         int err;
2924
2925         if (debug_level >= DEBUG_LEVEL_INFO)
2926                 printk("%s(%d):%s get_params()\n",
2927                          __FILE__,__LINE__, info->device_name);
2928
2929         if (!user_icount) {
2930                 memset(&info->icount, 0, sizeof(info->icount));
2931         } else {
2932                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2933                 if (err)
2934                         return -EFAULT;
2935         }
2936
2937         return 0;
2938 }
2939
2940 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2941 {
2942         int err;
2943         if (debug_level >= DEBUG_LEVEL_INFO)
2944                 printk("%s(%d):%s get_params()\n",
2945                          __FILE__,__LINE__, info->device_name);
2946
2947         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2948         if (err) {
2949                 if ( debug_level >= DEBUG_LEVEL_INFO )
2950                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2951                                 __FILE__,__LINE__,info->device_name);
2952                 return -EFAULT;
2953         }
2954
2955         return 0;
2956 }
2957
2958 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2959 {
2960         unsigned long flags;
2961         MGSL_PARAMS tmp_params;
2962         int err;
2963
2964         if (debug_level >= DEBUG_LEVEL_INFO)
2965                 printk("%s(%d):%s set_params\n",
2966                         __FILE__,__LINE__,info->device_name );
2967         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2968         if (err) {
2969                 if ( debug_level >= DEBUG_LEVEL_INFO )
2970                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2971                                 __FILE__,__LINE__,info->device_name);
2972                 return -EFAULT;
2973         }
2974
2975         spin_lock_irqsave(&info->lock,flags);
2976         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2977         spin_unlock_irqrestore(&info->lock,flags);
2978
2979         change_params(info);
2980
2981         return 0;
2982 }
2983
2984 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2985 {
2986         int err;
2987
2988         if (debug_level >= DEBUG_LEVEL_INFO)
2989                 printk("%s(%d):%s get_txidle()=%d\n",
2990                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2991
2992         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2993         if (err) {
2994                 if ( debug_level >= DEBUG_LEVEL_INFO )
2995                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2996                                 __FILE__,__LINE__,info->device_name);
2997                 return -EFAULT;
2998         }
2999
3000         return 0;
3001 }
3002
3003 static int set_txidle(SLMP_INFO * info, int idle_mode)
3004 {
3005         unsigned long flags;
3006
3007         if (debug_level >= DEBUG_LEVEL_INFO)
3008                 printk("%s(%d):%s set_txidle(%d)\n",
3009                         __FILE__,__LINE__,info->device_name, idle_mode );
3010
3011         spin_lock_irqsave(&info->lock,flags);
3012         info->idle_mode = idle_mode;
3013         tx_set_idle( info );
3014         spin_unlock_irqrestore(&info->lock,flags);
3015         return 0;
3016 }
3017
3018 static int tx_enable(SLMP_INFO * info, int enable)
3019 {
3020         unsigned long flags;
3021
3022         if (debug_level >= DEBUG_LEVEL_INFO)
3023                 printk("%s(%d):%s tx_enable(%d)\n",
3024                         __FILE__,__LINE__,info->device_name, enable);
3025
3026         spin_lock_irqsave(&info->lock,flags);
3027         if ( enable ) {
3028                 if ( !info->tx_enabled ) {
3029                         tx_start(info);
3030                 }
3031         } else {
3032                 if ( info->tx_enabled )
3033                         tx_stop(info);
3034         }
3035         spin_unlock_irqrestore(&info->lock,flags);
3036         return 0;
3037 }
3038
3039 /* abort send HDLC frame
3040  */
3041 static int tx_abort(SLMP_INFO * info)
3042 {
3043         unsigned long flags;
3044
3045         if (debug_level >= DEBUG_LEVEL_INFO)
3046                 printk("%s(%d):%s tx_abort()\n",
3047                         __FILE__,__LINE__,info->device_name);
3048
3049         spin_lock_irqsave(&info->lock,flags);
3050         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3051                 info->ie1_value &= ~UDRN;
3052                 info->ie1_value |= IDLE;
3053                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3054                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3055
3056                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3057                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3058
3059                 write_reg(info, CMD, TXABORT);
3060         }
3061         spin_unlock_irqrestore(&info->lock,flags);
3062         return 0;
3063 }
3064
3065 static int rx_enable(SLMP_INFO * info, int enable)
3066 {
3067         unsigned long flags;
3068
3069         if (debug_level >= DEBUG_LEVEL_INFO)
3070                 printk("%s(%d):%s rx_enable(%d)\n",
3071                         __FILE__,__LINE__,info->device_name,enable);
3072
3073         spin_lock_irqsave(&info->lock,flags);
3074         if ( enable ) {
3075                 if ( !info->rx_enabled )
3076                         rx_start(info);
3077         } else {
3078                 if ( info->rx_enabled )
3079                         rx_stop(info);
3080         }
3081         spin_unlock_irqrestore(&info->lock,flags);
3082         return 0;
3083 }
3084
3085 /* wait for specified event to occur
3086  */
3087 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3088 {
3089         unsigned long flags;
3090         int s;
3091         int rc=0;
3092         struct mgsl_icount cprev, cnow;
3093         int events;
3094         int mask;
3095         struct  _input_signal_events oldsigs, newsigs;
3096         DECLARE_WAITQUEUE(wait, current);
3097
3098         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3099         if (rc) {
3100                 return  -EFAULT;
3101         }
3102
3103         if (debug_level >= DEBUG_LEVEL_INFO)
3104                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3105                         __FILE__,__LINE__,info->device_name,mask);
3106
3107         spin_lock_irqsave(&info->lock,flags);
3108
3109         /* return immediately if state matches requested events */
3110         get_signals(info);
3111         s = info->serial_signals;
3112
3113         events = mask &
3114                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3115                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3116                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3117                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3118         if (events) {
3119                 spin_unlock_irqrestore(&info->lock,flags);
3120                 goto exit;
3121         }
3122
3123         /* save current irq counts */
3124         cprev = info->icount;
3125         oldsigs = info->input_signal_events;
3126
3127         /* enable hunt and idle irqs if needed */
3128         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3129                 unsigned char oldval = info->ie1_value;
3130                 unsigned char newval = oldval +
3131                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3132                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3133                 if ( oldval != newval ) {
3134                         info->ie1_value = newval;
3135                         write_reg(info, IE1, info->ie1_value);
3136                 }
3137         }
3138
3139         set_current_state(TASK_INTERRUPTIBLE);
3140         add_wait_queue(&info->event_wait_q, &wait);
3141
3142         spin_unlock_irqrestore(&info->lock,flags);
3143
3144         for(;;) {
3145                 schedule();
3146                 if (signal_pending(current)) {
3147                         rc = -ERESTARTSYS;
3148                         break;
3149                 }
3150
3151                 /* get current irq counts */
3152                 spin_lock_irqsave(&info->lock,flags);
3153                 cnow = info->icount;
3154                 newsigs = info->input_signal_events;
3155                 set_current_state(TASK_INTERRUPTIBLE);
3156                 spin_unlock_irqrestore(&info->lock,flags);
3157
3158                 /* if no change, wait aborted for some reason */
3159                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3160                     newsigs.dsr_down == oldsigs.dsr_down &&
3161                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3162                     newsigs.dcd_down == oldsigs.dcd_down &&
3163                     newsigs.cts_up   == oldsigs.cts_up   &&
3164                     newsigs.cts_down == oldsigs.cts_down &&
3165                     newsigs.ri_up    == oldsigs.ri_up    &&
3166                     newsigs.ri_down  == oldsigs.ri_down  &&
3167                     cnow.exithunt    == cprev.exithunt   &&
3168                     cnow.rxidle      == cprev.rxidle) {
3169                         rc = -EIO;
3170                         break;
3171                 }
3172
3173                 events = mask &
3174                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3175                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3176                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3177                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3178                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3179                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3180                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3181                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3182                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3183                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3184                 if (events)
3185                         break;
3186
3187                 cprev = cnow;
3188                 oldsigs = newsigs;
3189         }
3190
3191         remove_wait_queue(&info->event_wait_q, &wait);
3192         set_current_state(TASK_RUNNING);
3193
3194
3195         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3196                 spin_lock_irqsave(&info->lock,flags);
3197                 if (!waitqueue_active(&info->event_wait_q)) {
3198                         /* disable enable exit hunt mode/idle rcvd IRQs */
3199                         info->ie1_value &= ~(FLGD|IDLD);
3200                         write_reg(info, IE1, info->ie1_value);
3201                 }
3202                 spin_unlock_irqrestore(&info->lock,flags);
3203         }
3204 exit:
3205         if ( rc == 0 )
3206                 PUT_USER(rc, events, mask_ptr);
3207
3208         return rc;
3209 }
3210
3211 static int modem_input_wait(SLMP_INFO *info,int arg)
3212 {
3213         unsigned long flags;
3214         int rc;
3215         struct mgsl_icount cprev, cnow;
3216         DECLARE_WAITQUEUE(wait, current);
3217
3218         /* save current irq counts */
3219         spin_lock_irqsave(&info->lock,flags);
3220         cprev = info->icount;
3221         add_wait_queue(&info->status_event_wait_q, &wait);
3222         set_current_state(TASK_INTERRUPTIBLE);
3223         spin_unlock_irqrestore(&info->lock,flags);
3224
3225         for(;;) {
3226                 schedule();
3227                 if (signal_pending(current)) {
3228                         rc = -ERESTARTSYS;
3229                         break;
3230                 }
3231
3232                 /* get new irq counts */
3233                 spin_lock_irqsave(&info->lock,flags);
3234                 cnow = info->icount;
3235                 set_current_state(TASK_INTERRUPTIBLE);
3236                 spin_unlock_irqrestore(&info->lock,flags);
3237
3238                 /* if no change, wait aborted for some reason */
3239                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3240                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3241                         rc = -EIO;
3242                         break;
3243                 }
3244
3245                 /* check for change in caller specified modem input */
3246                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3247                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3248                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3249                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3250                         rc = 0;
3251                         break;
3252                 }
3253
3254                 cprev = cnow;
3255         }
3256         remove_wait_queue(&info->status_event_wait_q, &wait);
3257         set_current_state(TASK_RUNNING);
3258         return rc;
3259 }
3260
3261 /* return the state of the serial control and status signals
3262  */
3263 static int tiocmget(struct tty_struct *tty, struct file *file)
3264 {
3265         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3266         unsigned int result;
3267         unsigned long flags;
3268
3269         spin_lock_irqsave(&info->lock,flags);
3270         get_signals(info);
3271         spin_unlock_irqrestore(&info->lock,flags);
3272
3273         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3274                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3275                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3276                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3277                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3278                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3279
3280         if (debug_level >= DEBUG_LEVEL_INFO)
3281                 printk("%s(%d):%s tiocmget() value=%08X\n",
3282                          __FILE__,__LINE__, info->device_name, result );
3283         return result;
3284 }
3285
3286 /* set modem control signals (DTR/RTS)
3287  */
3288 static int tiocmset(struct tty_struct *tty, struct file *file,
3289                     unsigned int set, unsigned int clear)
3290 {
3291         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3292         unsigned long flags;
3293
3294         if (debug_level >= DEBUG_LEVEL_INFO)
3295                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3296                         __FILE__,__LINE__,info->device_name, set, clear);
3297
3298         if (set & TIOCM_RTS)
3299                 info->serial_signals |= SerialSignal_RTS;
3300         if (set & TIOCM_DTR)
3301                 info->serial_signals |= SerialSignal_DTR;
3302         if (clear & TIOCM_RTS)
3303                 info->serial_signals &= ~SerialSignal_RTS;
3304         if (clear & TIOCM_DTR)
3305                 info->serial_signals &= ~SerialSignal_DTR;
3306
3307         spin_lock_irqsave(&info->lock,flags);
3308         set_signals(info);
3309         spin_unlock_irqrestore(&info->lock,flags);
3310
3311         return 0;
3312 }
3313
3314
3315
3316 /* Block the current process until the specified port is ready to open.
3317  */
3318 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3319                            SLMP_INFO *info)
3320 {
3321         DECLARE_WAITQUEUE(wait, current);
3322         int             retval;
3323         int             do_clocal = 0, extra_count = 0;
3324         unsigned long   flags;
3325
3326         if (debug_level >= DEBUG_LEVEL_INFO)
3327                 printk("%s(%d):%s block_til_ready()\n",
3328                          __FILE__,__LINE__, tty->driver->name );
3329
3330         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3331                 /* nonblock mode is set or port is not enabled */
3332                 /* just verify that callout device is not active */
3333                 info->flags |= ASYNC_NORMAL_ACTIVE;
3334                 return 0;
3335         }
3336
3337         if (tty->termios->c_cflag & CLOCAL)
3338                 do_clocal = 1;
3339
3340         /* Wait for carrier detect and the line to become
3341          * free (i.e., not in use by the callout).  While we are in
3342          * this loop, info->count is dropped by one, so that
3343          * close() knows when to free things.  We restore it upon
3344          * exit, either normal or abnormal.
3345          */
3346
3347         retval = 0;
3348         add_wait_queue(&info->open_wait, &wait);
3349
3350         if (debug_level >= DEBUG_LEVEL_INFO)
3351                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3352                          __FILE__,__LINE__, tty->driver->name, info->count );
3353
3354         spin_lock_irqsave(&info->lock, flags);
3355         if (!tty_hung_up_p(filp)) {
3356                 extra_count = 1;
3357                 info->count--;
3358         }
3359         spin_unlock_irqrestore(&info->lock, flags);
3360         info->blocked_open++;
3361
3362         while (1) {
3363                 if ((tty->termios->c_cflag & CBAUD)) {
3364                         spin_lock_irqsave(&info->lock,flags);
3365                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3366                         set_signals(info);
3367                         spin_unlock_irqrestore(&info->lock,flags);
3368                 }
3369
3370                 set_current_state(TASK_INTERRUPTIBLE);
3371
3372                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3373                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3374                                         -EAGAIN : -ERESTARTSYS;
3375                         break;
3376                 }
3377
3378                 spin_lock_irqsave(&info->lock,flags);
3379                 get_signals(info);
3380                 spin_unlock_irqrestore(&info->lock,flags);
3381
3382                 if (!(info->flags & ASYNC_CLOSING) &&
3383                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3384                         break;
3385                 }
3386
3387                 if (signal_pending(current)) {
3388                         retval = -ERESTARTSYS;
3389                         break;
3390                 }
3391
3392                 if (debug_level >= DEBUG_LEVEL_INFO)
3393                         printk("%s(%d):%s block_til_ready() count=%d\n",
3394                                  __FILE__,__LINE__, tty->driver->name, info->count );
3395
3396                 schedule();
3397         }
3398
3399         set_current_state(TASK_RUNNING);
3400         remove_wait_queue(&info->open_wait, &wait);
3401
3402         if (extra_count)
3403                 info->count++;
3404         info->blocked_open--;
3405
3406         if (debug_level >= DEBUG_LEVEL_INFO)
3407                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3408                          __FILE__,__LINE__, tty->driver->name, info->count );
3409
3410         if (!retval)
3411                 info->flags |= ASYNC_NORMAL_ACTIVE;
3412
3413         return retval;
3414 }
3415
3416 int alloc_dma_bufs(SLMP_INFO *info)
3417 {
3418         unsigned short BuffersPerFrame;
3419         unsigned short BufferCount;
3420
3421         // Force allocation to start at 64K boundary for each port.
3422         // This is necessary because *all* buffer descriptors for a port
3423         // *must* be in the same 64K block. All descriptors on a port
3424         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3425         // into the CBP register.
3426         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3427
3428         /* Calculate the number of DMA buffers necessary to hold the */
3429         /* largest allowable frame size. Note: If the max frame size is */
3430         /* not an even multiple of the DMA buffer size then we need to */
3431         /* round the buffer count per frame up one. */
3432
3433         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3434         if ( info->max_frame_size % SCABUFSIZE )
3435                 BuffersPerFrame++;
3436
3437         /* calculate total number of data buffers (SCABUFSIZE) possible
3438          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3439          * for the descriptor list (BUFFERLISTSIZE).
3440          */
3441         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3442
3443         /* limit number of buffers to maximum amount of descriptors */
3444         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3445                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3446
3447         /* use enough buffers to transmit one max size frame */
3448         info->tx_buf_count = BuffersPerFrame + 1;
3449
3450         /* never use more than half the available buffers for transmit */
3451         if (info->tx_buf_count > (BufferCount/2))
3452                 info->tx_buf_count = BufferCount/2;
3453
3454         if (info->tx_buf_count > SCAMAXDESC)
3455                 info->tx_buf_count = SCAMAXDESC;
3456
3457         /* use remaining buffers for receive */
3458         info->rx_buf_count = BufferCount - info->tx_buf_count;
3459
3460         if (info->rx_buf_count > SCAMAXDESC)
3461                 info->rx_buf_count = SCAMAXDESC;
3462
3463         if ( debug_level >= DEBUG_LEVEL_INFO )
3464                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3465                         __FILE__,__LINE__, info->device_name,
3466                         info->tx_buf_count,info->rx_buf_count);
3467
3468         if ( alloc_buf_list( info ) < 0 ||
3469                 alloc_frame_bufs(info,
3470                                         info->rx_buf_list,
3471                                         info->rx_buf_list_ex,
3472                                         info->rx_buf_count) < 0 ||
3473                 alloc_frame_bufs(info,
3474                                         info->tx_buf_list,
3475                                         info->tx_buf_list_ex,
3476                                         info->tx_buf_count) < 0 ||
3477                 alloc_tmp_rx_buf(info) < 0 ) {
3478                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3479                         __FILE__,__LINE__, info->device_name);
3480                 return -ENOMEM;
3481         }
3482
3483         rx_reset_buffers( info );
3484
3485         return 0;
3486 }
3487
3488 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3489  */
3490 int alloc_buf_list(SLMP_INFO *info)
3491 {
3492         unsigned int i;
3493
3494         /* build list in adapter shared memory */
3495         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3496         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3497         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3498
3499         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3500
3501         /* Save virtual address pointers to the receive and */
3502         /* transmit buffer lists. (Receive 1st). These pointers will */
3503         /* be used by the processor to access the lists. */
3504         info->rx_buf_list = (SCADESC *)info->buffer_list;
3505
3506         info->tx_buf_list = (SCADESC *)info->buffer_list;
3507         info->tx_buf_list += info->rx_buf_count;
3508
3509         /* Build links for circular buffer entry lists (tx and rx)
3510          *
3511          * Note: links are physical addresses read by the SCA device
3512          * to determine the next buffer entry to use.
3513          */
3514
3515         for ( i = 0; i < info->rx_buf_count; i++ ) {
3516                 /* calculate and store physical address of this buffer entry */
3517                 info->rx_buf_list_ex[i].phys_entry =
3518                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3519
3520                 /* calculate and store physical address of */
3521                 /* next entry in cirular list of entries */
3522                 info->rx_buf_list[i].next = info->buffer_list_phys;
3523                 if ( i < info->rx_buf_count - 1 )
3524                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3525
3526                 info->rx_buf_list[i].length = SCABUFSIZE;
3527         }
3528
3529         for ( i = 0; i < info->tx_buf_count; i++ ) {
3530                 /* calculate and store physical address of this buffer entry */
3531                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3532                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3533
3534                 /* calculate and store physical address of */
3535                 /* next entry in cirular list of entries */
3536
3537                 info->tx_buf_list[i].next = info->buffer_list_phys +
3538                         info->rx_buf_count * sizeof(SCADESC);
3539
3540                 if ( i < info->tx_buf_count - 1 )
3541                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3542         }
3543
3544         return 0;
3545 }
3546
3547 /* Allocate the frame DMA buffers used by the specified buffer list.
3548  */
3549 int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3550 {
3551         int i;
3552         unsigned long phys_addr;
3553
3554         for ( i = 0; i < count; i++ ) {
3555                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3556                 phys_addr = info->port_array[0]->last_mem_alloc;
3557                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3558
3559                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3560                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3561         }
3562
3563         return 0;
3564 }
3565
3566 void free_dma_bufs(SLMP_INFO *info)
3567 {
3568         info->buffer_list = NULL;
3569         info->rx_buf_list = NULL;
3570         info->tx_buf_list = NULL;
3571 }
3572
3573 /* allocate buffer large enough to hold max_frame_size.
3574  * This buffer is used to pass an assembled frame to the line discipline.
3575  */
3576 int alloc_tmp_rx_buf(SLMP_INFO *info)
3577 {
3578         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3579         if (info->tmp_rx_buf == NULL)
3580                 return -ENOMEM;
3581         return 0;
3582 }
3583
3584 void free_tmp_rx_buf(SLMP_INFO *info)
3585 {
3586         kfree(info->tmp_rx_buf);
3587         info->tmp_rx_buf = NULL;
3588 }
3589
3590 int claim_resources(SLMP_INFO *info)
3591 {
3592         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3593                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3594                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3595                 info->init_error = DiagStatus_AddressConflict;
3596                 goto errout;
3597         }
3598         else
3599                 info->shared_mem_requested = 1;
3600
3601         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3602                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3603                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3604                 info->init_error = DiagStatus_AddressConflict;
3605                 goto errout;
3606         }
3607         else
3608                 info->lcr_mem_requested = 1;
3609
3610         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3611                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3612                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3613                 info->init_error = DiagStatus_AddressConflict;
3614                 goto errout;
3615         }
3616         else
3617                 info->sca_base_requested = 1;
3618
3619         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3620                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3621                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3622                 info->init_error = DiagStatus_AddressConflict;
3623                 goto errout;
3624         }
3625         else
3626                 info->sca_statctrl_requested = 1;
3627
3628         info->memory_base = ioremap(info->phys_memory_base,SCA_MEM_SIZE);
3629         if (!info->memory_base) {
3630                 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3631                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3632                 info->init_error = DiagStatus_CantAssignPciResources;
3633                 goto errout;
3634         }
3635
3636         info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE);
3637         if (!info->lcr_base) {
3638                 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3639                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3640                 info->init_error = DiagStatus_CantAssignPciResources;
3641                 goto errout;
3642         }
3643         info->lcr_base += info->lcr_offset;
3644
3645         info->sca_base = ioremap(info->phys_sca_base,PAGE_SIZE);
3646         if (!info->sca_base) {
3647                 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3648                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3649                 info->init_error = DiagStatus_CantAssignPciResources;
3650                 goto errout;
3651         }
3652         info->sca_base += info->sca_offset;
3653
3654         info->statctrl_base = ioremap(info->phys_statctrl_base,PAGE_SIZE);
3655         if (!info->statctrl_base) {
3656                 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3657                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3658                 info->init_error = DiagStatus_CantAssignPciResources;
3659                 goto errout;
3660         }
3661         info->statctrl_base += info->statctrl_offset;
3662
3663         if ( !memory_test(info) ) {
3664                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3665                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3666                 info->init_error = DiagStatus_MemoryError;
3667                 goto errout;
3668         }
3669
3670         return 0;
3671
3672 errout:
3673         release_resources( info );
3674         return -ENODEV;
3675 }
3676
3677 void release_resources(SLMP_INFO *info)
3678 {
3679         if ( debug_level >= DEBUG_LEVEL_INFO )
3680                 printk( "%s(%d):%s release_resources() entry\n",
3681                         __FILE__,__LINE__,info->device_name );
3682
3683         if ( info->irq_requested ) {
3684                 free_irq(info->irq_level, info);
3685                 info->irq_requested = 0;
3686         }
3687
3688         if ( info->shared_mem_requested ) {
3689                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3690                 info->shared_mem_requested = 0;
3691         }
3692         if ( info->lcr_mem_requested ) {
3693                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3694                 info->lcr_mem_requested = 0;
3695         }
3696         if ( info->sca_base_requested ) {
3697                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3698                 info->sca_base_requested = 0;
3699         }
3700         if ( info->sca_statctrl_requested ) {
3701                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3702                 info->sca_statctrl_requested = 0;
3703         }
3704
3705         if (info->memory_base){
3706                 iounmap(info->memory_base);
3707                 info->memory_base = NULL;
3708         }
3709
3710         if (info->sca_base) {
3711                 iounmap(info->sca_base - info->sca_offset);
3712                 info->sca_base=NULL;
3713         }
3714
3715         if (info->statctrl_base) {
3716                 iounmap(info->statctrl_base - info->statctrl_offset);
3717                 info->statctrl_base=NULL;
3718         }
3719