drivers/serial/sunsu.c

   1 /* $Id: su.c,v 1.55 2002/01/08 16:00:16 davem Exp $
   2  * su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
   3  *
   4  * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
   5  * Copyright (C) 1998-1999  Pete Zaitcev   (zaitcev@yahoo.com)
   6  *
   7  * This is mainly a variation of 8250.c, credits go to authors mentioned
   8  * therein.  In fact this driver should be merged into the generic 8250.c
   9  * infrastructure perhaps using a 8250_sparc.c module.
  10  *
  11  * Fixed to use tty_get_baud_rate().
  12  *   Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
  13  *
  14  * Converted to new 2.5.x UART layer.
  15  *   David S. Miller (davem@davemloft.net), 2002-Jul-29
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/errno.h>
  22 #include <linux/tty.h>
  23 #include <linux/tty_flip.h>
  24 #include <linux/major.h>
  25 #include <linux/string.h>
  26 #include <linux/ptrace.h>
  27 #include <linux/ioport.h>
  28 #include <linux/circ_buf.h>
  29 #include <linux/serial.h>
  30 #include <linux/sysrq.h>
  31 #include <linux/console.h>
  32 #ifdef CONFIG_SERIO
  33 #include <linux/serio.h>
  34 #endif
  35 #include <linux/serial_reg.h>
  36 #include <linux/init.h>
  37 #include <linux/delay.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/irq.h>
  41 #include <asm/prom.h>
  42 #include <asm/of_device.h>
  43
  44 #if defined(CONFIG_SERIAL_SUNSU_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  45 #define SUPPORT_SYSRQ
  46 #endif
  47
  48 #include <linux/serial_core.h>
  49
  50 #include "suncore.h"
  51
  52 /* We are on a NS PC87303 clocked with 24.0 MHz, which results
  53  * in a UART clock of 1.8462 MHz.
  54  */
  55 #define SU_BASE_BAUD    (1846200 / 16)
  56
  57 enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT };
  58 static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" };
  59
  60 /*
  61  * Here we define the default xmit fifo size used for each type of UART.
  62  */
  63 static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = {
  64         { "unknown",    1,      0 },
  65         { "8250",       1,      0 },
  66         { "16450",      1,      0 },
  67         { "16550",      1,      0 },
  68         { "16550A",     16,     UART_CLEAR_FIFO | UART_USE_FIFO },
  69         { "Cirrus",     1,      0 },
  70         { "ST16650",    1,      UART_CLEAR_FIFO | UART_STARTECH },
  71         { "ST16650V2",  32,     UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
  72         { "TI16750",    64,     UART_CLEAR_FIFO | UART_USE_FIFO },
  73         { "Startech",   1,      0 },
  74         { "16C950/954", 128,    UART_CLEAR_FIFO | UART_USE_FIFO },
  75         { "ST16654",    64,     UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
  76         { "XR16850",    128,    UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
  77         { "RSA",        2048,   UART_CLEAR_FIFO | UART_USE_FIFO }
  78 };
  79
  80 struct uart_sunsu_port {
  81         struct uart_port        port;
  82         unsigned char           acr;
  83         unsigned char           ier;
  84         unsigned short          rev;
  85         unsigned char           lcr;
  86         unsigned int            lsr_break_flag;
  87         unsigned int            cflag;
  88
  89         /* Probing information.  */
  90         enum su_type            su_type;
  91         unsigned int            type_probed;    /* XXX Stupid */
  92         unsigned long           reg_size;
  93
  94 #ifdef CONFIG_SERIO
  95         struct serio            serio;
  96         int                     serio_open;
  97 #endif
  98 };
  99
 100 static unsigned int serial_in(struct uart_sunsu_port *up, int offset)
 101 {
 102         offset <<= up->port.regshift;
 103
 104         switch (up->port.iotype) {
 105         case UPIO_HUB6:
 106                 outb(up->port.hub6 - 1 + offset, up->port.iobase);
 107                 return inb(up->port.iobase + 1);
 108
 109         case UPIO_MEM:
 110                 return readb(up->port.membase + offset);
 111
 112         default:
 113                 return inb(up->port.iobase + offset);
 114         }
 115 }
 116
 117 static void serial_out(struct uart_sunsu_port *up, int offset, int value)
 118 {
 119 #ifndef CONFIG_SPARC64
 120         /*
 121          * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
 122          * connected with a gate then go to SlavIO. When IRQ4 goes tristated
 123          * gate outputs a logical one. Since we use level triggered interrupts
 124          * we have lockup and watchdog reset. We cannot mask IRQ because
 125          * keyboard shares IRQ with us (Word has it as Bob Smelik's design).
 126          * This problem is similar to what Alpha people suffer, see serial.c.
 127          */
 128         if (offset == UART_MCR)
 129                 value |= UART_MCR_OUT2;
 130 #endif
 131         offset <<= up->port.regshift;
 132
 133         switch (up->port.iotype) {
 134         case UPIO_HUB6:
 135                 outb(up->port.hub6 - 1 + offset, up->port.iobase);
 136                 outb(value, up->port.iobase + 1);
 137                 break;
 138
 139         case UPIO_MEM:
 140                 writeb(value, up->port.membase + offset);
 141                 break;
 142
 143         default:
 144                 outb(value, up->port.iobase + offset);
 145         }
 146 }
 147
 148 /*
 149  * We used to support using pause I/O for certain machines.  We
 150  * haven't supported this for a while, but just in case it's badly
 151  * needed for certain old 386 machines, I've left these #define's
 152  * in....
 153  */
 154 #define serial_inp(up, offset)          serial_in(up, offset)
 155 #define serial_outp(up, offset, value)  serial_out(up, offset, value)
 156
 157
 158 /*
 159  * For the 16C950
 160  */
 161 static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
 162 {
 163         serial_out(up, UART_SCR, offset);
 164         serial_out(up, UART_ICR, value);
 165 }
 166
 167 #if 0 /* Unused currently */
 168 static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset)
 169 {
 170         unsigned int value;
 171
 172         serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
 173         serial_out(up, UART_SCR, offset);
 174         value = serial_in(up, UART_ICR);
 175         serial_icr_write(up, UART_ACR, up->acr);
 176
 177         return value;
 178 }
 179 #endif
 180
 181 #ifdef CONFIG_SERIAL_8250_RSA
 182 /*
 183  * Attempts to turn on the RSA FIFO.  Returns zero on failure.
 184  * We set the port uart clock rate if we succeed.
 185  */
 186 static int __enable_rsa(struct uart_sunsu_port *up)
 187 {
 188         unsigned char mode;
 189         int result;
 190
 191         mode = serial_inp(up, UART_RSA_MSR);
 192         result = mode & UART_RSA_MSR_FIFO;
 193
 194         if (!result) {
 195                 serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
 196                 mode = serial_inp(up, UART_RSA_MSR);
 197                 result = mode & UART_RSA_MSR_FIFO;
 198         }
 199
 200         if (result)
 201                 up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
 202
 203         return result;
 204 }
 205
 206 static void enable_rsa(struct uart_sunsu_port *up)
 207 {
 208         if (up->port.type == PORT_RSA) {
 209                 if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
 210                         spin_lock_irq(&up->port.lock);
 211                         __enable_rsa(up);
 212                         spin_unlock_irq(&up->port.lock);
 213                 }
 214                 if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
 215                         serial_outp(up, UART_RSA_FRR, 0);
 216         }
 217 }
 218
 219 /*
 220  * Attempts to turn off the RSA FIFO.  Returns zero on failure.
 221  * It is unknown why interrupts were disabled in here.  However,
 222  * the caller is expected to preserve this behaviour by grabbing
 223  * the spinlock before calling this function.
 224  */
 225 static void disable_rsa(struct uart_sunsu_port *up)
 226 {
 227         unsigned char mode;
 228         int result;
 229
 230         if (up->port.type == PORT_RSA &&
 231             up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
 232                 spin_lock_irq(&up->port.lock);
 233
 234                 mode = serial_inp(up, UART_RSA_MSR);
 235                 result = !(mode & UART_RSA_MSR_FIFO);
 236
 237                 if (!result) {
 238                         serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
 239                         mode = serial_inp(up, UART_RSA_MSR);
 240                         result = !(mode & UART_RSA_MSR_FIFO);
 241                 }
 242
 243                 if (result)
 244                         up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
 245                 spin_unlock_irq(&up->port.lock);
 246         }
 247 }
 248 #endif /* CONFIG_SERIAL_8250_RSA */
 249
 250 static inline void __stop_tx(struct uart_sunsu_port *p)
 251 {
 252         if (p->ier & UART_IER_THRI) {
 253                 p->ier &= ~UART_IER_THRI;
 254                 serial_out(p, UART_IER, p->ier);
 255         }
 256 }
 257
 258 static void sunsu_stop_tx(struct uart_port *port)
 259 {
 260         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 261
 262         __stop_tx(up);
 263
 264         /*
 265          * We really want to stop the transmitter from sending.
 266          */
 267         if (up->port.type == PORT_16C950) {
 268                 up->acr |= UART_ACR_TXDIS;
 269                 serial_icr_write(up, UART_ACR, up->acr);
 270         }
 271 }
 272
 273 static void sunsu_start_tx(struct uart_port *port)
 274 {
 275         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 276
 277         if (!(up->ier & UART_IER_THRI)) {
 278                 up->ier |= UART_IER_THRI;
 279                 serial_out(up, UART_IER, up->ier);
 280         }
 281
 282         /*
 283          * Re-enable the transmitter if we disabled it.
 284          */
 285         if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
 286                 up->acr &= ~UART_ACR_TXDIS;
 287                 serial_icr_write(up, UART_ACR, up->acr);
 288         }
 289 }
 290
 291 static void sunsu_stop_rx(struct uart_port *port)
 292 {
 293         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 294
 295         up->ier &= ~UART_IER_RLSI;
 296         up->port.read_status_mask &= ~UART_LSR_DR;
 297         serial_out(up, UART_IER, up->ier);
 298 }
 299
 300 static void sunsu_enable_ms(struct uart_port *port)
 301 {
 302         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 303         unsigned long flags;
 304
 305         spin_lock_irqsave(&up->port.lock, flags);
 306         up->ier |= UART_IER_MSI;
 307         serial_out(up, UART_IER, up->ier);
 308         spin_unlock_irqrestore(&up->port.lock, flags);
 309 }
 310
 311 static struct tty_struct *
 312 receive_chars(struct uart_sunsu_port *up, unsigned char *status)
 313 {
 314         struct tty_struct *tty = up->port.info->tty;
 315         unsigned char ch, flag;
 316         int max_count = 256;
 317         int saw_console_brk = 0;
 318
 319         do {
 320                 ch = serial_inp(up, UART_RX);
 321                 flag = TTY_NORMAL;
 322                 up->port.icount.rx++;
 323
 324                 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
 325                                        UART_LSR_FE | UART_LSR_OE))) {
 326                         /*
 327                          * For statistics only
 328                          */
 329                         if (*status & UART_LSR_BI) {
 330                                 *status &= ~(UART_LSR_FE | UART_LSR_PE);
 331                                 up->port.icount.brk++;
 332                                 if (up->port.cons != NULL &&
 333                                     up->port.line == up->port.cons->index)
 334                                         saw_console_brk = 1;
 335                                 /*
 336                                  * We do the SysRQ and SAK checking
 337                                  * here because otherwise the break
 338                                  * may get masked by ignore_status_mask
 339                                  * or read_status_mask.
 340                                  */
 341                                 if (uart_handle_break(&up->port))
 342                                         goto ignore_char;
 343                         } else if (*status & UART_LSR_PE)
 344                                 up->port.icount.parity++;
 345                         else if (*status & UART_LSR_FE)
 346                                 up->port.icount.frame++;
 347                         if (*status & UART_LSR_OE)
 348                                 up->port.icount.overrun++;
 349
 350                         /*
 351                          * Mask off conditions which should be ingored.
 352                          */
 353                         *status &= up->port.read_status_mask;
 354
 355                         if (up->port.cons != NULL &&
 356                             up->port.line == up->port.cons->index) {
 357                                 /* Recover the break flag from console xmit */
 358                                 *status |= up->lsr_break_flag;
 359                                 up->lsr_break_flag = 0;
 360                         }
 361
 362                         if (*status & UART_LSR_BI) {
 363                                 flag = TTY_BREAK;
 364                         } else if (*status & UART_LSR_PE)
 365                                 flag = TTY_PARITY;
 366                         else if (*status & UART_LSR_FE)
 367                                 flag = TTY_FRAME;
 368                 }
 369                 if (uart_handle_sysrq_char(&up->port, ch))
 370                         goto ignore_char;
 371                 if ((*status & up->port.ignore_status_mask) == 0)
 372                         tty_insert_flip_char(tty, ch, flag);
 373                 if (*status & UART_LSR_OE)
 374                         /*
 375                          * Overrun is special, since it's reported
 376                          * immediately, and doesn't affect the current
 377                          * character.
 378                          */
 379                          tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 380         ignore_char:
 381                 *status = serial_inp(up, UART_LSR);
 382         } while ((*status & UART_LSR_DR) && (max_count-- > 0));
 383
 384         if (saw_console_brk)
 385                 sun_do_break();
 386
 387         return tty;
 388 }
 389
 390 static void transmit_chars(struct uart_sunsu_port *up)
 391 {
 392         struct circ_buf *xmit = &up->port.info->xmit;
 393         int count;
 394
 395         if (up->port.x_char) {
 396                 serial_outp(up, UART_TX, up->port.x_char);
 397                 up->port.icount.tx++;
 398                 up->port.x_char = 0;
 399                 return;
 400         }
 401         if (uart_tx_stopped(&up->port)) {
 402                 sunsu_stop_tx(&up->port);
 403                 return;
 404         }
 405         if (uart_circ_empty(xmit)) {
 406                 __stop_tx(up);
 407                 return;
 408         }
 409
 410         count = up->port.fifosize;
 411         do {
 412                 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
 413                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 414                 up->port.icount.tx++;
 415                 if (uart_circ_empty(xmit))
 416                         break;
 417         } while (--count > 0);
 418
 419         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 420                 uart_write_wakeup(&up->port);
 421
 422         if (uart_circ_empty(xmit))
 423                 __stop_tx(up);
 424 }
 425
 426 static void check_modem_status(struct uart_sunsu_port *up)
 427 {
 428         int status;
 429
 430         status = serial_in(up, UART_MSR);
 431
 432         if ((status & UART_MSR_ANY_DELTA) == 0)
 433                 return;
 434
 435         if (status & UART_MSR_TERI)
 436                 up->port.icount.rng++;
 437         if (status & UART_MSR_DDSR)
 438                 up->port.icount.dsr++;
 439         if (status & UART_MSR_DDCD)
 440                 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
 441         if (status & UART_MSR_DCTS)
 442                 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
 443
 444         wake_up_interruptible(&up->port.info->delta_msr_wait);
 445 }
 446
 447 static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
 448 {
 449         struct uart_sunsu_port *up = dev_id;
 450         unsigned long flags;
 451         unsigned char status;
 452
 453         spin_lock_irqsave(&up->port.lock, flags);
 454
 455         do {
 456                 struct tty_struct *tty;
 457
 458                 status = serial_inp(up, UART_LSR);
 459                 tty = NULL;
 460                 if (status & UART_LSR_DR)
 461                         tty = receive_chars(up, &status);
 462                 check_modem_status(up);
 463                 if (status & UART_LSR_THRE)
 464                         transmit_chars(up);
 465
 466                 spin_unlock_irqrestore(&up->port.lock, flags);
 467
 468                 if (tty)
 469                         tty_flip_buffer_push(tty);
 470
 471                 spin_lock_irqsave(&up->port.lock, flags);
 472
 473         } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));
 474
 475         spin_unlock_irqrestore(&up->port.lock, flags);
 476
 477         return IRQ_HANDLED;
 478 }
 479
 480 /* Separate interrupt handling path for keyboard/mouse ports.  */
 481
 482 static void
 483 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
 484                    unsigned int iflag, unsigned int quot);
 485
 486 static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
 487 {
 488         unsigned int cur_cflag = up->cflag;
 489         int quot, new_baud;
 490
 491         up->cflag &= ~CBAUD;
 492         up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
 493
 494         quot = up->port.uartclk / (16 * new_baud);
 495
 496         sunsu_change_speed(&up->port, up->cflag, 0, quot);
 497 }
 498
 499 static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break)
 500 {
 501         do {
 502                 unsigned char ch = serial_inp(up, UART_RX);
 503
 504                 /* Stop-A is handled by drivers/char/keyboard.c now. */
 505                 if (up->su_type == SU_PORT_KBD) {
 506 #ifdef CONFIG_SERIO
 507                         serio_interrupt(&up->serio, ch, 0);
 508 #endif
 509                 } else if (up->su_type == SU_PORT_MS) {
 510                         int ret = suncore_mouse_baud_detection(ch, is_break);
 511
 512                         switch (ret) {
 513                         case 2:
 514                                 sunsu_change_mouse_baud(up);
 515                                 /* fallthru */
 516                         case 1:
 517                                 break;
 518
 519                         case 0:
 520 #ifdef CONFIG_SERIO
 521                                 serio_interrupt(&up->serio, ch, 0);
 522 #endif
 523                                 break;
 524                         };
 525                 }
 526         } while (serial_in(up, UART_LSR) & UART_LSR_DR);
 527 }
 528
 529 static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id)
 530 {
 531         struct uart_sunsu_port *up = dev_id;
 532
 533         if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
 534                 unsigned char status = serial_inp(up, UART_LSR);
 535
 536                 if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
 537                         receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0);
 538         }
 539
 540         return IRQ_HANDLED;
 541 }
 542
 543 static unsigned int sunsu_tx_empty(struct uart_port *port)
 544 {
 545         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 546         unsigned long flags;
 547         unsigned int ret;
 548
 549         spin_lock_irqsave(&up->port.lock, flags);
 550         ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
 551         spin_unlock_irqrestore(&up->port.lock, flags);
 552
 553         return ret;
 554 }
 555
 556 static unsigned int sunsu_get_mctrl(struct uart_port *port)
 557 {
 558         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 559         unsigned char status;
 560         unsigned int ret;
 561
 562         status = serial_in(up, UART_MSR);
 563
 564         ret = 0;
 565         if (status & UART_MSR_DCD)
 566                 ret |= TIOCM_CAR;
 567         if (status & UART_MSR_RI)
 568                 ret |= TIOCM_RNG;
 569         if (status & UART_MSR_DSR)
 570                 ret |= TIOCM_DSR;
 571         if (status & UART_MSR_CTS)
 572                 ret |= TIOCM_CTS;
 573         return ret;
 574 }
 575
 576 static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
 577 {
 578         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 579         unsigned char mcr = 0;
 580
 581         if (mctrl & TIOCM_RTS)
 582                 mcr |= UART_MCR_RTS;
 583         if (mctrl & TIOCM_DTR)
 584                 mcr |= UART_MCR_DTR;
 585         if (mctrl & TIOCM_OUT1)
 586                 mcr |= UART_MCR_OUT1;
 587         if (mctrl & TIOCM_OUT2)
 588                 mcr |= UART_MCR_OUT2;
 589         if (mctrl & TIOCM_LOOP)
 590                 mcr |= UART_MCR_LOOP;
 591
 592         serial_out(up, UART_MCR, mcr);
 593 }
 594
 595 static void sunsu_break_ctl(struct uart_port *port, int break_state)
 596 {
 597         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 598         unsigned long flags;
 599
 600         spin_lock_irqsave(&up->port.lock, flags);
 601         if (break_state == -1)
 602                 up->lcr |= UART_LCR_SBC;
 603         else
 604                 up->lcr &= ~UART_LCR_SBC;
 605         serial_out(up, UART_LCR, up->lcr);
 606         spin_unlock_irqrestore(&up->port.lock, flags);
 607 }
 608
 609 static int sunsu_startup(struct uart_port *port)
 610 {
 611         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 612         unsigned long flags;
 613         int retval;
 614
 615         if (up->port.type == PORT_16C950) {
 616                 /* Wake up and initialize UART */
 617                 up->acr = 0;
 618                 serial_outp(up, UART_LCR, 0xBF);
 619                 serial_outp(up, UART_EFR, UART_EFR_ECB);
 620                 serial_outp(up, UART_IER, 0);
 621                 serial_outp(up, UART_LCR, 0);
 622                 serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
 623                 serial_outp(up, UART_LCR, 0xBF);
 624                 serial_outp(up, UART_EFR, UART_EFR_ECB);
 625                 serial_outp(up, UART_LCR, 0);
 626         }
 627
 628 #ifdef CONFIG_SERIAL_8250_RSA
 629         /*
 630          * If this is an RSA port, see if we can kick it up to the
 631          * higher speed clock.
 632          */
 633         enable_rsa(up);
 634 #endif
 635
 636         /*
 637          * Clear the FIFO buffers and disable them.
 638          * (they will be reenabled in set_termios())
 639          */
 640         if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
 641                 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 642                 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 643                                 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
 644                 serial_outp(up, UART_FCR, 0);
 645         }
 646
 647         /*
 648          * Clear the interrupt registers.
 649          */
 650         (void) serial_inp(up, UART_LSR);
 651         (void) serial_inp(up, UART_RX);
 652         (void) serial_inp(up, UART_IIR);
 653         (void) serial_inp(up, UART_MSR);
 654
 655         /*
 656          * At this point, there's no way the LSR could still be 0xff;
 657          * if it is, then bail out, because there's likely no UART
 658          * here.
 659          */
 660         if (!(up->port.flags & UPF_BUGGY_UART) &&
 661             (serial_inp(up, UART_LSR) == 0xff)) {
 662                 printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
 663                 return -ENODEV;
 664         }
 665
 666         if (up->su_type != SU_PORT_PORT) {
 667                 retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
 668                                      IRQF_SHARED, su_typev[up->su_type], up);
 669         } else {
 670                 retval = request_irq(up->port.irq, sunsu_serial_interrupt,
 671                                      IRQF_SHARED, su_typev[up->su_type], up);
 672         }
 673         if (retval) {
 674                 printk("su: Cannot register IRQ %d\n", up->port.irq);
 675                 return retval;
 676         }
 677
 678         /*
 679          * Now, initialize the UART
 680          */
 681         serial_outp(up, UART_LCR, UART_LCR_WLEN8);
 682
 683         spin_lock_irqsave(&up->port.lock, flags);
 684
 685         up->port.mctrl |= TIOCM_OUT2;
 686
 687         sunsu_set_mctrl(&up->port, up->port.mctrl);
 688         spin_unlock_irqrestore(&up->port.lock, flags);
 689
 690         /*
 691          * Finally, enable interrupts.  Note: Modem status interrupts
 692          * are set via set_termios(), which will be occurring imminently
 693          * anyway, so we don't enable them here.
 694          */
 695         up->ier = UART_IER_RLSI | UART_IER_RDI;
 696         serial_outp(up, UART_IER, up->ier);
 697
 698         if (up->port.flags & UPF_FOURPORT) {
 699                 unsigned int icp;
 700                 /*
 701                  * Enable interrupts on the AST Fourport board
 702                  */
 703                 icp = (up->port.iobase & 0xfe0) | 0x01f;
 704                 outb_p(0x80, icp);
 705                 (void) inb_p(icp);
 706         }
 707
 708         /*
 709          * And clear the interrupt registers again for luck.
 710          */
 711         (void) serial_inp(up, UART_LSR);
 712         (void) serial_inp(up, UART_RX);
 713         (void) serial_inp(up, UART_IIR);
 714         (void) serial_inp(up, UART_MSR);
 715
 716         return 0;
 717 }
 718
 719 static void sunsu_shutdown(struct uart_port *port)
 720 {
 721         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 722         unsigned long flags;
 723
 724         /*
 725          * Disable interrupts from this port
 726          */
 727         up->ier = 0;
 728         serial_outp(up, UART_IER, 0);
 729
 730         spin_lock_irqsave(&up->port.lock, flags);
 731         if (up->port.flags & UPF_FOURPORT) {
 732                 /* reset interrupts on the AST Fourport board */
 733                 inb((up->port.iobase & 0xfe0) | 0x1f);
 734                 up->port.mctrl |= TIOCM_OUT1;
 735         } else
 736                 up->port.mctrl &= ~TIOCM_OUT2;
 737
 738         sunsu_set_mctrl(&up->port, up->port.mctrl);
 739         spin_unlock_irqrestore(&up->port.lock, flags);
 740
 741         /*
 742          * Disable break condition and FIFOs
 743          */
 744         serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
 745         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 746                                   UART_FCR_CLEAR_RCVR |
 747                                   UART_FCR_CLEAR_XMIT);
 748         serial_outp(up, UART_FCR, 0);
 749
 750 #ifdef CONFIG_SERIAL_8250_RSA
 751         /*
 752          * Reset the RSA board back to 115kbps compat mode.
 753          */
 754         disable_rsa(up);
 755 #endif
 756
 757         /*
 758          * Read data port to reset things.
 759          */
 760         (void) serial_in(up, UART_RX);
 761
 762         free_irq(up->port.irq, up);
 763 }
 764
 765 static void
 766 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
 767                    unsigned int iflag, unsigned int quot)
 768 {
 769         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 770         unsigned char cval, fcr = 0;
 771         unsigned long flags;
 772
 773         switch (cflag & CSIZE) {
 774         case CS5:
 775                 cval = 0x00;
 776                 break;
 777         case CS6:
 778                 cval = 0x01;
 779                 break;
 780         case CS7:
 781                 cval = 0x02;
 782                 break;
 783         default:
 784         case CS8:
 785                 cval = 0x03;
 786                 break;
 787         }
 788
 789         if (cflag & CSTOPB)
 790                 cval |= 0x04;
 791         if (cflag & PARENB)
 792                 cval |= UART_LCR_PARITY;
 793         if (!(cflag & PARODD))
 794                 cval |= UART_LCR_EPAR;
 795 #ifdef CMSPAR
 796         if (cflag & CMSPAR)
 797                 cval |= UART_LCR_SPAR;
 798 #endif
 799
 800         /*
 801          * Work around a bug in the Oxford Semiconductor 952 rev B
 802          * chip which causes it to seriously miscalculate baud rates
 803          * when DLL is 0.
 804          */
 805         if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
 806             up->rev == 0x5201)
 807                 quot ++;
 808
 809         if (uart_config[up->port.type].flags & UART_USE_FIFO) {
 810                 if ((up->port.uartclk / quot) < (2400 * 16))
 811                         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
 812 #ifdef CONFIG_SERIAL_8250_RSA
 813                 else if (up->port.type == PORT_RSA)
 814                         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
 815 #endif
 816                 else
 817                         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
 818         }
 819         if (up->port.type == PORT_16750)
 820                 fcr |= UART_FCR7_64BYTE;
 821
 822         /*
 823          * Ok, we're now changing the port state.  Do it with
 824          * interrupts disabled.
 825          */
 826         spin_lock_irqsave(&up->port.lock, flags);
 827
 828         /*
 829          * Update the per-port timeout.
 830          */
 831         uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
 832
 833         up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 834         if (iflag & INPCK)
 835                 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 836         if (iflag & (BRKINT | PARMRK))
 837                 up->port.read_status_mask |= UART_LSR_BI;
 838
 839         /*
 840          * Characteres to ignore
 841          */
 842         up->port.ignore_status_mask = 0;
 843         if (iflag & IGNPAR)
 844                 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 845         if (iflag & IGNBRK) {
 846                 up->port.ignore_status_mask |= UART_LSR_BI;
 847                 /*
 848                  * If we're ignoring parity and break indicators,
 849                  * ignore overruns too (for real raw support).
 850                  */
 851                 if (iflag & IGNPAR)
 852                         up->port.ignore_status_mask |= UART_LSR_OE;
 853         }
 854
 855         /*
 856          * ignore all characters if CREAD is not set
 857          */
 858         if ((cflag & CREAD) == 0)
 859                 up->port.ignore_status_mask |= UART_LSR_DR;
 860
 861         /*
 862          * CTS flow control flag and modem status interrupts
 863          */
 864         up->ier &= ~UART_IER_MSI;
 865         if (UART_ENABLE_MS(&up->port, cflag))
 866                 up->ier |= UART_IER_MSI;
 867
 868         serial_out(up, UART_IER, up->ier);
 869
 870         if (uart_config[up->port.type].flags & UART_STARTECH) {
 871                 serial_outp(up, UART_LCR, 0xBF);
 872                 serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
 873         }
 874         serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
 875         serial_outp(up, UART_DLL, quot & 0xff);         /* LS of divisor */
 876         serial_outp(up, UART_DLM, quot >> 8);           /* MS of divisor */
 877         if (up->port.type == PORT_16750)
 878                 serial_outp(up, UART_FCR, fcr);         /* set fcr */
 879         serial_outp(up, UART_LCR, cval);                /* reset DLAB */
 880         up->lcr = cval;                                 /* Save LCR */
 881         if (up->port.type != PORT_16750) {
 882                 if (fcr & UART_FCR_ENABLE_FIFO) {
 883                         /* emulated UARTs (Lucent Venus 167x) need two steps */
 884                         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 885                 }
 886                 serial_outp(up, UART_FCR, fcr);         /* set fcr */
 887         }
 888
 889         up->cflag = cflag;
 890
 891         spin_unlock_irqrestore(&up->port.lock, flags);
 892 }
 893
 894 static void
 895 sunsu_set_termios(struct uart_port *port, struct ktermios *termios,
 896                   struct ktermios *old)
 897 {
 898         unsigned int baud, quot;
 899
 900         /*
 901          * Ask the core to calculate the divisor for us.
 902          */
 903         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 904         quot = uart_get_divisor(port, baud);
 905
 906         sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
 907 }
 908
 909 static void sunsu_release_port(struct uart_port *port)
 910 {
 911 }
 912
 913 static int sunsu_request_port(struct uart_port *port)
 914 {
 915         return 0;
 916 }
 917
 918 static void sunsu_config_port(struct uart_port *port, int flags)
 919 {
 920         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 921
 922         if (flags & UART_CONFIG_TYPE) {
 923                 /*
 924                  * We are supposed to call autoconfig here, but this requires
 925                  * splitting all the OBP probing crap from the UART probing.
 926                  * We'll do it when we kill sunsu.c altogether.
 927                  */
 928                 port->type = up->type_probed;   /* XXX */
 929         }
 930 }
 931
 932 static int
 933 sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
 934 {
 935         return -EINVAL;
 936 }
 937
 938 static const char *
 939 sunsu_type(struct uart_port *port)
 940 {
 941         int type = port->type;
 942
 943         if (type >= ARRAY_SIZE(uart_config))
 944                 type = 0;
 945         return uart_config[type].name;
 946 }
 947
 948 static struct uart_ops sunsu_pops = {
 949         .tx_empty       = sunsu_tx_empty,
 950         .set_mctrl      = sunsu_set_mctrl,
 951         .get_mctrl      = sunsu_get_mctrl,
 952         .stop_tx        = sunsu_stop_tx,
 953         .start_tx       = sunsu_start_tx,
 954         .stop_rx        = sunsu_stop_rx,
 955         .enable_ms      = sunsu_enable_ms,
 956         .break_ctl      = sunsu_break_ctl,
 957         .startup        = sunsu_startup,
 958         .shutdown       = sunsu_shutdown,
 959         .set_termios    = sunsu_set_termios,
 960         .type           = sunsu_type,
 961         .release_port   = sunsu_release_port,
 962         .request_port   = sunsu_request_port,
 963         .config_port    = sunsu_config_port,
 964         .verify_port    = sunsu_verify_port,
 965 };
 966
 967 #define UART_NR 4
 968
 969 static struct uart_sunsu_port sunsu_ports[UART_NR];
 970
 971 #ifdef CONFIG_SERIO
 972
 973 static DEFINE_SPINLOCK(sunsu_serio_lock);
 974
 975 static int sunsu_serio_write(struct serio *serio, unsigned char ch)
 976 {
 977         struct uart_sunsu_port *up = serio->port_data;
 978         unsigned long flags;
 979         int lsr;
 980
 981         spin_lock_irqsave(&sunsu_serio_lock, flags);
 982
 983         do {
 984                 lsr = serial_in(up, UART_LSR);
 985         } while (!(lsr & UART_LSR_THRE));
 986
 987         /* Send the character out. */
 988         serial_out(up, UART_TX, ch);
 989
 990         spin_unlock_irqrestore(&sunsu_serio_lock, flags);
 991
 992         return 0;
 993 }
 994
 995 static int sunsu_serio_open(struct serio *serio)
 996 {
 997         struct uart_sunsu_port *up = serio->port_data;
 998         unsigned long flags;
 999         int ret;
1000
1001         spin_lock_irqsave(&sunsu_serio_lock, flags);
1002         if (!up->serio_open) {
1003                 up->serio_open = 1;
1004                 ret = 0;
1005         } else
1006                 ret = -EBUSY;
1007         spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1008
1009         return ret;
1010 }
1011
1012 static void sunsu_serio_close(struct serio *serio)
1013 {
1014         struct uart_sunsu_port *up = serio->port_data;
1015         unsigned long flags;
1016
1017         spin_lock_irqsave(&sunsu_serio_lock, flags);
1018         up->serio_open = 0;
1019         spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1020 }
1021
1022 #endif /* CONFIG_SERIO */
1023
1024 static void sunsu_autoconfig(struct uart_sunsu_port *up)
1025 {
1026         unsigned char status1, status2, scratch, scratch2, scratch3;
1027         unsigned char save_lcr, save_mcr;
1028         unsigned long flags;
1029
1030         if (up->su_type == SU_PORT_NONE)
1031                 return;
1032
1033         up->type_probed = PORT_UNKNOWN;
1034         up->port.iotype = UPIO_MEM;
1035
1036         spin_lock_irqsave(&up->port.lock, flags);
1037
1038         if (!(up->port.flags & UPF_BUGGY_UART)) {
1039                 /*
1040                  * Do a simple existence test first; if we fail this, there's
1041                  * no point trying anything else.
1042                  *
1043                  * 0x80 is used as a nonsense port to prevent against false
1044                  * positives due to ISA bus float.  The assumption is that
1045                  * 0x80 is a non-existent port; which should be safe since
1046                  * include/asm/io.h also makes this assumption.
1047                  */
1048                 scratch = serial_inp(up, UART_IER);
1049                 serial_outp(up, UART_IER, 0);
1050 #ifdef __i386__
1051                 outb(0xff, 0x080);
1052 #endif
1053                 scratch2 = serial_inp(up, UART_IER);
1054                 serial_outp(up, UART_IER, 0x0f);
1055 #ifdef __i386__
1056                 outb(0, 0x080);
1057 #endif
1058                 scratch3 = serial_inp(up, UART_IER);
1059                 serial_outp(up, UART_IER, scratch);
1060                 if (scratch2 != 0 || scratch3 != 0x0F)
1061                         goto out;       /* We failed; there's nothing here */
1062         }
1063
1064         save_mcr = serial_in(up, UART_MCR);
1065         save_lcr = serial_in(up, UART_LCR);
1066
1067         /*
1068          * Check to see if a UART is really there.  Certain broken
1069          * internal modems based on the Rockwell chipset fail this
1070          * test, because they apparently don't implement the loopback
1071          * test mode.  So this test is skipped on the COM 1 through
1072          * COM 4 ports.  This *should* be safe, since no board
1073          * manufacturer would be stupid enough to design a board
1074          * that conflicts with COM 1-4 --- we hope!
1075          */
1076         if (!(up->port.flags & UPF_SKIP_TEST)) {
1077                 serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
1078                 status1 = serial_inp(up, UART_MSR) & 0xF0;
1079                 serial_outp(up, UART_MCR, save_mcr);
1080                 if (status1 != 0x90)
1081                         goto out;       /* We failed loopback test */
1082         }
1083         serial_outp(up, UART_LCR, 0xBF);        /* set up for StarTech test */
1084         serial_outp(up, UART_EFR, 0);           /* EFR is the same as FCR */
1085         serial_outp(up, UART_LCR, 0);
1086         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1087         scratch = serial_in(up, UART_IIR) >> 6;
1088         switch (scratch) {
1089                 case 0:
1090                         up->port.type = PORT_16450;
1091                         break;
1092                 case 1:
1093                         up->port.type = PORT_UNKNOWN;
1094                         break;
1095                 case 2:
1096                         up->port.type = PORT_16550;
1097                         break;
1098                 case 3:
1099                         up->port.type = PORT_16550A;
1100                         break;
1101         }
1102         if (up->port.type == PORT_16550A) {
1103                 /* Check for Startech UART's */
1104                 serial_outp(up, UART_LCR, UART_LCR_DLAB);
1105                 if (serial_in(up, UART_EFR) == 0) {
1106                         up->port.type = PORT_16650;
1107                 } else {
1108                         serial_outp(up, UART_LCR, 0xBF);
1109                         if (serial_in(up, UART_EFR) == 0)
1110                                 up->port.type = PORT_16650V2;
1111                 }
1112         }
1113         if (up->port.type == PORT_16550A) {
1114                 /* Check for TI 16750 */
1115                 serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
1116                 serial_outp(up, UART_FCR,
1117                             UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1118                 scratch = serial_in(up, UART_IIR) >> 5;
1119                 if (scratch == 7) {
1120                         /*
1121                          * If this is a 16750, and not a cheap UART
1122                          * clone, then it should only go into 64 byte
1123                          * mode if the UART_FCR7_64BYTE bit was set
1124                          * while UART_LCR_DLAB was latched.
1125                          */
1126                         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1127                         serial_outp(up, UART_LCR, 0);
1128                         serial_outp(up, UART_FCR,
1129                                     UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1130                         scratch = serial_in(up, UART_IIR) >> 5;
1131                         if (scratch == 6)
1132                                 up->port.type = PORT_16750;
1133                 }
1134                 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1135         }
1136         serial_outp(up, UART_LCR, save_lcr);
1137         if (up->port.type == PORT_16450) {
1138                 scratch = serial_in(up, UART_SCR);
1139                 serial_outp(up, UART_SCR, 0xa5);
1140                 status1 = serial_in(up, UART_SCR);
1141                 serial_outp(up, UART_SCR, 0x5a);
1142                 status2 = serial_in(up, UART_SCR);
1143                 serial_outp(up, UART_SCR, scratch);
1144
1145                 if ((status1 != 0xa5) || (status2 != 0x5a))
1146                         up->port.type = PORT_8250;
1147         }
1148
1149         up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
1150
1151         if (up->port.type == PORT_UNKNOWN)
1152                 goto out;
1153         up->type_probed = up->port.type;        /* XXX */
1154
1155         /*
1156          * Reset the UART.
1157          */
1158 #ifdef CONFIG_SERIAL_8250_RSA
1159         if (up->port.type == PORT_RSA)
1160                 serial_outp(up, UART_RSA_FRR, 0);
1161 #endif
1162         serial_outp(up, UART_MCR, save_mcr);
1163         serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
1164                                      UART_FCR_CLEAR_RCVR |
1165                                      UART_FCR_CLEAR_XMIT));
1166         serial_outp(up, UART_FCR, 0);
1167         (void)serial_in(up, UART_RX);
1168         serial_outp(up, UART_IER, 0);
1169
1170 out:
1171         spin_unlock_irqrestore(&up->port.lock, flags);
1172 }
1173
1174 static struct uart_driver sunsu_reg = {
1175         .owner                  = THIS_MODULE,
1176         .driver_name            = "serial",
1177         .dev_name               = "ttyS",
1178         .major                  = TTY_MAJOR,
1179 };
1180
1181 static int __init sunsu_kbd_ms_init(struct uart_sunsu_port *up)
1182 {
1183         int quot, baud;
1184 #ifdef CONFIG_SERIO
1185         struct serio *serio;
1186 #endif
1187
1188         if (up->su_type == SU_PORT_KBD) {
1189                 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1190                 baud = 1200;
1191         } else {
1192                 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1193                 baud = 4800;
1194         }
1195         quot = up->port.uartclk / (16 * baud);
1196
1197         sunsu_autoconfig(up);
1198         if (up->port.type == PORT_UNKNOWN)
1199                 return -ENODEV;
1200
1201         printk("%s: %s port at %lx, irq %u\n",
1202                to_of_device(up->port.dev)->node->full_name,
1203                (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse",
1204                up->port.mapbase, up->port.irq);
1205
1206 #ifdef CONFIG_SERIO
1207         serio = &up->serio;
1208         serio->port_data = up;
1209
1210         serio->id.type = SERIO_RS232;
1211         if (up->su_type == SU_PORT_KBD) {
1212                 serio->id.proto = SERIO_SUNKBD;
1213                 strlcpy(serio->name, "sukbd", sizeof(serio->name));
1214         } else {
1215                 serio->id.proto = SERIO_SUN;
1216                 serio->id.extra = 1;
1217                 strlcpy(serio->name, "sums", sizeof(serio->name));
1218         }
1219         strlcpy(serio->phys,
1220                 (!(up->port.line & 1) ? "su/serio0" : "su/serio1"),
1221                 sizeof(serio->phys));
1222
1223         serio->write = sunsu_serio_write;
1224         serio->open = sunsu_serio_open;
1225         serio->close = sunsu_serio_close;
1226         serio->dev.parent = up->port.dev;
1227
1228         serio_register_port(serio);
1229 #endif
1230
1231         sunsu_change_speed(&up->port, up->cflag, 0, quot);
1232
1233         sunsu_startup(&up->port);
1234         return 0;
1235 }
1236
1237 /*
1238  * ------------------------------------------------------------
1239  * Serial console driver
1240  * ------------------------------------------------------------
1241  */
1242
1243 #ifdef CONFIG_SERIAL_SUNSU_CONSOLE
1244
1245 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1246
1247 /*
1248  *      Wait for transmitter & holding register to empty
1249  */
1250 static __inline__ void wait_for_xmitr(struct uart_sunsu_port *up)
1251 {
1252         unsigned int status, tmout = 10000;
1253
1254         /* Wait up to 10ms for the character(s) to be sent. */
1255         do {
1256                 status = serial_in(up, UART_LSR);
1257
1258                 if (status & UART_LSR_BI)
1259                         up->lsr_break_flag = UART_LSR_BI;
1260
1261                 if (--tmout == 0)
1262                         break;
1263                 udelay(1);
1264         } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1265
1266         /* Wait up to 1s for flow control if necessary */
1267         if (up->port.flags & UPF_CONS_FLOW) {
1268                 tmout = 1000000;
1269                 while (--tmout &&
1270                        ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
1271                         udelay(1);
1272         }
1273 }
1274
1275 static void sunsu_console_putchar(struct uart_port *port, int ch)
1276 {
1277         struct uart_sunsu_port *up = (struct uart_sunsu_port *)port;
1278
1279         wait_for_xmitr(up);
1280         serial_out(up, UART_TX, ch);
1281 }
1282
1283 /*
1284  *      Print a string to the serial port trying not to disturb
1285  *      any possible real use of the port...
1286  */
1287 static void sunsu_console_write(struct console *co, const char *s,
1288                                 unsigned int count)
1289 {
1290         struct uart_sunsu_port *up = &sunsu_ports[co->index];
1291         unsigned long flags;
1292         unsigned int ier;
1293         int locked = 1;
1294
1295         local_irq_save(flags);
1296         if (up->port.sysrq) {
1297                 locked = 0;
1298         } else if (oops_in_progress) {
1299                 locked = spin_trylock(&up->port.lock);
1300         } else
1301                 spin_lock(&up->port.lock);
1302
1303         /*
1304          *      First save the UER then disable the interrupts
1305          */
1306         ier = serial_in(up, UART_IER);
1307         serial_out(up, UART_IER, 0);
1308
1309         uart_console_write(&up->port, s, count, sunsu_console_putchar);
1310
1311         /*
1312          *      Finally, wait for transmitter to become empty
1313          *      and restore the IER
1314          */
1315         wait_for_xmitr(up);
1316         serial_out(up, UART_IER, ier);
1317
1318         if (locked)
1319                 spin_unlock(&up->port.lock);
1320         local_irq_restore(flags);
1321 }
1322
1323 /*
1324  *      Setup initial baud/bits/parity. We do two things here:
1325  *      - construct a cflag setting for the first su_open()
1326  *      - initialize the serial port
1327  *      Return non-zero if we didn't find a serial port.
1328  */
1329 static int __init sunsu_console_setup(struct console *co, char *options)
1330 {
1331         struct uart_port *port;
1332         int baud = 9600;
1333         int bits = 8;
1334         int parity = 'n';
1335         int flow = 'n';
1336
1337         printk("Console: ttyS%d (SU)\n",
1338                (sunsu_reg.minor - 64) + co->index);
1339
1340         /*
1341          * Check whether an invalid uart number has been specified, and
1342          * if so, search for the first available port that does have
1343          * console support.
1344          */
1345         if (co->index >= UART_NR)
1346                 co->index = 0;
1347         port = &sunsu_ports[co->index].port;
1348
1349         /*
1350          * Temporary fix.
1351          */
1352         spin_lock_init(&port->lock);
1353
1354         if (options)
1355                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1356
1357         return uart_set_options(port, co, baud, parity, bits, flow);
1358 }
1359
1360 static struct console sunsu_console = {
1361         .name   =       "ttyS",
1362         .write  =       sunsu_console_write,
1363         .device =       uart_console_device,
1364         .setup  =       sunsu_console_setup,
1365         .flags  =       CON_PRINTBUFFER,
1366         .index  =       -1,
1367         .data   =       &sunsu_reg,
1368 };
1369
1370 /*
1371  *      Register console.
1372  */
1373
1374 static inline struct console *SUNSU_CONSOLE(void)
1375 {
1376         return &sunsu_console;
1377 }
1378 #else
1379 #define SUNSU_CONSOLE()                 (NULL)
1380 #define sunsu_serial_console_init()     do { } while (0)
1381 #endif
1382
1383 static enum su_type __devinit su_get_type(struct device_node *dp)
1384 {
1385         struct device_node *ap = of_find_node_by_path("/aliases");
1386
1387         if (ap) {
1388                 const char *keyb = of_get_property(ap, "keyboard", NULL);
1389                 const char *ms = of_get_property(ap, "mouse", NULL);
1390
1391                 if (keyb) {
1392                         if (dp == of_find_node_by_path(keyb))
1393                                 return SU_PORT_KBD;
1394                 }
1395                 if (ms) {
1396                         if (dp == of_find_node_by_path(ms))
1397                                 return SU_PORT_MS;
1398                 }
1399         }
1400
1401         return SU_PORT_PORT;
1402 }
1403
1404 static int __devinit su_probe(struct of_device *op, const struct of_device_id *match)
1405 {
1406         static int inst;
1407         struct device_node *dp = op->node;
1408         struct uart_sunsu_port *up;
1409         struct resource *rp;
1410         enum su_type type;
1411         int err;
1412
1413         type = su_get_type(dp);
1414         if (type == SU_PORT_PORT) {
1415                 if (inst >= UART_NR)
1416                         return -EINVAL;
1417                 up = &sunsu_ports[inst];
1418         } else {
1419                 up = kzalloc(sizeof(*up), GFP_KERNEL);
1420                 if (!up)
1421                         return -ENOMEM;
1422         }
1423
1424         up->port.line = inst;
1425
1426         spin_lock_init(&up->port.lock);
1427
1428         up->su_type = type;
1429
1430         rp = &op->resource[0];
1431         up->port.mapbase = rp->start;
1432         up->reg_size = (rp->end - rp->start) + 1;
1433         up->port.membase = of_ioremap(rp, 0, up->reg_size, "su");
1434         if (!up->port.membase) {
1435                 if (type != SU_PORT_PORT)
1436                         kfree(up);
1437                 return -ENOMEM;
1438         }
1439
1440         up->port.irq = op->irqs[0];
1441
1442         up->port.dev = &op->dev;
1443
1444         up->port.type = PORT_UNKNOWN;
1445         up->port.uartclk = (SU_BASE_BAUD * 16);
1446
1447         err = 0;
1448         if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) {
1449                 err = sunsu_kbd_ms_init(up);
1450                 if (err) {
1451                         kfree(up);
1452                         goto out_unmap;
1453                 }
1454                 dev_set_drvdata(&op->dev, up);
1455
1456                 return 0;
1457         }
1458
1459         up->port.flags |= UPF_BOOT_AUTOCONF;
1460
1461         sunsu_autoconfig(up);
1462
1463         err = -ENODEV;
1464         if (up->port.type == PORT_UNKNOWN)
1465                 goto out_unmap;
1466
1467         up->port.ops = &sunsu_pops;
1468
1469         sunserial_console_match(SUNSU_CONSOLE(), dp,
1470                                 &sunsu_reg, up->port.line);
1471         err = uart_add_one_port(&sunsu_reg, &up->port);
1472         if (err)
1473                 goto out_unmap;
1474
1475         dev_set_drvdata(&op->dev, up);
1476
1477         inst++;
1478
1479         return 0;
1480
1481 out_unmap:
1482         of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
1483         return err;
1484 }
1485
1486 static int __devexit su_remove(struct of_device *op)
1487 {
1488         struct uart_sunsu_port *up = dev_get_drvdata(&op->dev);
1489
1490         if (up->su_type == SU_PORT_MS ||
1491             up->su_type == SU_PORT_KBD) {
1492 #ifdef CONFIG_SERIO
1493                 serio_unregister_port(&up->serio);
1494 #endif
1495                 kfree(up);
1496         } else if (up->port.type != PORT_UNKNOWN) {
1497                 uart_remove_one_port(&sunsu_reg, &up->port);
1498         }
1499
1500         if (up->port.membase)
1501                 of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
1502
1503         dev_set_drvdata(&op->dev, NULL);
1504
1505         return 0;
1506 }
1507
1508 static struct of_device_id su_match[] = {
1509         {
1510                 .name = "su",
1511         },
1512         {
1513                 .name = "su_pnp",
1514         },
1515         {
1516                 .name = "serial",
1517                 .compatible = "su",
1518         },
1519         {},
1520 };
1521 MODULE_DEVICE_TABLE(of, su_match);
1522
1523 static struct of_platform_driver su_driver = {
1524         .name           = "su",
1525         .match_table    = su_match,
1526         .probe          = su_probe,
1527         .remove         = __devexit_p(su_remove),
1528 };
1529
1530 static int num_uart;
1531
1532 static int __init sunsu_init(void)
1533 {
1534         struct device_node *dp;
1535         int err;
1536
1537         num_uart = 0;
1538         for_each_node_by_name(dp, "su") {
1539                 if (su_get_type(dp) == SU_PORT_PORT)
1540                         num_uart++;
1541         }
1542         for_each_node_by_name(dp, "su_pnp") {
1543                 if (su_get_type(dp) == SU_PORT_PORT)
1544                         num_uart++;
1545         }
1546         for_each_node_by_name(dp, "serial") {
1547                 if (of_device_is_compatible(dp, "su")) {
1548                         if (su_get_type(dp) == SU_PORT_PORT)
1549                                 num_uart++;
1550                 }
1551         }
1552
1553         if (num_uart) {
1554                 sunsu_reg.minor = sunserial_current_minor;
1555                 sunsu_reg.nr = num_uart;
1556                 err = uart_register_driver(&sunsu_reg);
1557                 if (err)
1558                         return err;
1559                 sunsu_reg.tty_driver->name_base = sunsu_reg.minor - 64;
1560                 sunserial_current_minor += num_uart;
1561         }
1562
1563         err = of_register_driver(&su_driver, &of_bus_type);
1564         if (err && num_uart)
1565                 uart_unregister_driver(&sunsu_reg);
1566
1567         return err;
1568 }
1569
1570 static void __exit sunsu_exit(void)
1571 {
1572         if (num_uart)
1573                 uart_unregister_driver(&sunsu_reg);
1574 }
1575
1576 module_init(sunsu_init);
1577 module_exit(sunsu_exit);
1578
1579 MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller");
1580 MODULE_DESCRIPTION("Sun SU serial port driver");
1581 MODULE_VERSION("2.0");
1582 MODULE_LICENSE("GPL");