drivers/serial/sunsab.c

   1 /* sunsab.c: ASYNC Driver for the SIEMENS SAB82532 DUSCC.
   2  *
   3  * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
   4  * Copyright (C) 2002  David S. Miller (davem@redhat.com)
   5  *
   6  * Rewrote buffer handling to use CIRC(Circular Buffer) macros.
   7  *   Maxim Krasnyanskiy <maxk@qualcomm.com>
   8  *
   9  * Fixed to use tty_get_baud_rate, and to allow for arbitrary baud
  10  * rates to be programmed into the UART.  Also eliminated a lot of
  11  * duplicated code in the console setup.
  12  *   Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
  13  *
  14  * Ported to new 2.5.x UART layer.
  15  *   David S. Miller <davem@redhat.com>
  16  */
  17
  18 #include <linux/config.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/sched.h>
  22 #include <linux/errno.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/major.h>
  26 #include <linux/string.h>
  27 #include <linux/ptrace.h>
  28 #include <linux/ioport.h>
  29 #include <linux/circ_buf.h>
  30 #include <linux/serial.h>
  31 #include <linux/sysrq.h>
  32 #include <linux/console.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/slab.h>
  35 #include <linux/delay.h>
  36 #include <linux/init.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/irq.h>
  40 #include <asm/oplib.h>
  41 #include <asm/ebus.h>
  42
  43 #if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  44 #define SUPPORT_SYSRQ
  45 #endif
  46
  47 #include <linux/serial_core.h>
  48
  49 #include "suncore.h"
  50 #include "sunsab.h"
  51
  52 struct uart_sunsab_port {
  53         struct uart_port                port;           /* Generic UART port    */
  54         union sab82532_async_regs       __iomem *regs;  /* Chip registers       */
  55         unsigned long                   irqflags;       /* IRQ state flags      */
  56         int                             dsr;            /* Current DSR state    */
  57         unsigned int                    cec_timeout;    /* Chip poll timeout... */
  58         unsigned int                    tec_timeout;    /* likewise             */
  59         unsigned char                   interrupt_mask0;/* ISR0 masking         */
  60         unsigned char                   interrupt_mask1;/* ISR1 masking         */
  61         unsigned char                   pvr_dtr_bit;    /* Which PVR bit is DTR */
  62         unsigned char                   pvr_dsr_bit;    /* Which PVR bit is DSR */
  63         int                             type;           /* SAB82532 version     */
  64
  65         /* Setting configuration bits while the transmitter is active
  66          * can cause garbage characters to get emitted by the chip.
  67          * Therefore, we cache such writes here and do the real register
  68          * write the next time the transmitter becomes idle.
  69          */
  70         unsigned int                    cached_ebrg;
  71         unsigned char                   cached_mode;
  72         unsigned char                   cached_pvr;
  73         unsigned char                   cached_dafo;
  74 };
  75
  76 /*
  77  * This assumes you have a 29.4912 MHz clock for your UART.
  78  */
  79 #define SAB_BASE_BAUD ( 29491200 / 16 )
  80
  81 static char *sab82532_version[16] = {
  82         "V1.0", "V2.0", "V3.2", "V(0x03)",
  83         "V(0x04)", "V(0x05)", "V(0x06)", "V(0x07)",
  84         "V(0x08)", "V(0x09)", "V(0x0a)", "V(0x0b)",
  85         "V(0x0c)", "V(0x0d)", "V(0x0e)", "V(0x0f)"
  86 };
  87
  88 #define SAB82532_MAX_TEC_TIMEOUT 200000 /* 1 character time (at 50 baud) */
  89 #define SAB82532_MAX_CEC_TIMEOUT  50000 /* 2.5 TX CLKs (at 50 baud) */
  90
  91 #define SAB82532_RECV_FIFO_SIZE 32      /* Standard async fifo sizes */
  92 #define SAB82532_XMIT_FIFO_SIZE 32
  93
  94 static __inline__ void sunsab_tec_wait(struct uart_sunsab_port *up)
  95 {
  96         int timeout = up->tec_timeout;
  97
  98         while ((readb(&up->regs->r.star) & SAB82532_STAR_TEC) && --timeout)
  99                 udelay(1);
 100 }
 101
 102 static __inline__ void sunsab_cec_wait(struct uart_sunsab_port *up)
 103 {
 104         int timeout = up->cec_timeout;
 105
 106         while ((readb(&up->regs->r.star) & SAB82532_STAR_CEC) && --timeout)
 107                 udelay(1);
 108 }
 109
 110 static struct tty_struct *
 111 receive_chars(struct uart_sunsab_port *up,
 112               union sab82532_irq_status *stat,
 113               struct pt_regs *regs)
 114 {
 115         struct tty_struct *tty = NULL;
 116         unsigned char buf[32];
 117         int saw_console_brk = 0;
 118         int free_fifo = 0;
 119         int count = 0;
 120         int i;
 121
 122         if (up->port.info != NULL)              /* Unopened serial console */
 123                 tty = up->port.info->tty;
 124
 125         /* Read number of BYTES (Character + Status) available. */
 126         if (stat->sreg.isr0 & SAB82532_ISR0_RPF) {
 127                 count = SAB82532_RECV_FIFO_SIZE;
 128                 free_fifo++;
 129         }
 130
 131         if (stat->sreg.isr0 & SAB82532_ISR0_TCD) {
 132                 count = readb(&up->regs->r.rbcl) & (SAB82532_RECV_FIFO_SIZE - 1);
 133                 free_fifo++;
 134         }
 135
 136         /* Issue a FIFO read command in case we where idle. */
 137         if (stat->sreg.isr0 & SAB82532_ISR0_TIME) {
 138                 sunsab_cec_wait(up);
 139                 writeb(SAB82532_CMDR_RFRD, &up->regs->w.cmdr);
 140                 return tty;
 141         }
 142
 143         if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
 144                 free_fifo++;
 145
 146         /* Read the FIFO. */
 147         for (i = 0; i < count; i++)
 148                 buf[i] = readb(&up->regs->r.rfifo[i]);
 149
 150         /* Issue Receive Message Complete command. */
 151         if (free_fifo) {
 152                 sunsab_cec_wait(up);
 153                 writeb(SAB82532_CMDR_RMC, &up->regs->w.cmdr);
 154         }
 155
 156         /* Count may be zero for BRK, so we check for it here */
 157         if ((stat->sreg.isr1 & SAB82532_ISR1_BRK) &&
 158             (up->port.line == up->port.cons->index))
 159                 saw_console_brk = 1;
 160
 161         for (i = 0; i < count; i++) {
 162                 unsigned char ch = buf[i];
 163
 164                 if (tty == NULL) {
 165                         uart_handle_sysrq_char(&up->port, ch, regs);
 166                         continue;
 167                 }
 168
 169                 if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
 170                         tty->flip.work.func((void *)tty);
 171                         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
 172                                 return tty; // if TTY_DONT_FLIP is set
 173                 }
 174
 175                 *tty->flip.char_buf_ptr = ch;
 176                 *tty->flip.flag_buf_ptr = TTY_NORMAL;
 177                 up->port.icount.rx++;
 178
 179                 if (unlikely(stat->sreg.isr0 & (SAB82532_ISR0_PERR |
 180                                                 SAB82532_ISR0_FERR |
 181                                                 SAB82532_ISR0_RFO)) ||
 182                     unlikely(stat->sreg.isr1 & SAB82532_ISR1_BRK)) {
 183                         /*
 184                          * For statistics only
 185                          */
 186                         if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
 187                                 stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR |
 188                                                      SAB82532_ISR0_FERR);
 189                                 up->port.icount.brk++;
 190                                 /*
 191                                  * We do the SysRQ and SAK checking
 192                                  * here because otherwise the break
 193                                  * may get masked by ignore_status_mask
 194                                  * or read_status_mask.
 195                                  */
 196                                 if (uart_handle_break(&up->port))
 197                                         continue;
 198                         } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
 199                                 up->port.icount.parity++;
 200                         else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
 201                                 up->port.icount.frame++;
 202                         if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
 203                                 up->port.icount.overrun++;
 204
 205                         /*
 206                          * Mask off conditions which should be ingored.
 207                          */
 208                         stat->sreg.isr0 &= (up->port.read_status_mask & 0xff);
 209                         stat->sreg.isr1 &= ((up->port.read_status_mask >> 8) & 0xff);
 210
 211                         if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
 212                                 *tty->flip.flag_buf_ptr = TTY_BREAK;
 213                         } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
 214                                 *tty->flip.flag_buf_ptr = TTY_PARITY;
 215                         else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
 216                                 *tty->flip.flag_buf_ptr = TTY_FRAME;
 217                 }
 218
 219                 if (uart_handle_sysrq_char(&up->port, ch, regs))
 220                         continue;
 221
 222                 if ((stat->sreg.isr0 & (up->port.ignore_status_mask & 0xff)) == 0 &&
 223                     (stat->sreg.isr1 & ((up->port.ignore_status_mask >> 8) & 0xff)) == 0){
 224                         tty->flip.flag_buf_ptr++;
 225                         tty->flip.char_buf_ptr++;
 226                         tty->flip.count++;
 227                 }
 228                 if ((stat->sreg.isr0 & SAB82532_ISR0_RFO) &&
 229                     tty->flip.count < TTY_FLIPBUF_SIZE) {
 230                         /*
 231                          * Overrun is special, since it's reported
 232                          * immediately, and doesn't affect the current
 233                          * character.
 234                          */
 235                         *tty->flip.flag_buf_ptr = TTY_OVERRUN;
 236                         tty->flip.flag_buf_ptr++;
 237                         tty->flip.char_buf_ptr++;
 238                         tty->flip.count++;
 239                 }
 240         }
 241
 242         if (saw_console_brk)
 243                 sun_do_break();
 244
 245         return tty;
 246 }
 247
 248 static void sunsab_stop_tx(struct uart_port *, unsigned int);
 249 static void sunsab_tx_idle(struct uart_sunsab_port *);
 250
 251 static void transmit_chars(struct uart_sunsab_port *up,
 252                            union sab82532_irq_status *stat)
 253 {
 254         struct circ_buf *xmit = &up->port.info->xmit;
 255         int i;
 256
 257         if (stat->sreg.isr1 & SAB82532_ISR1_ALLS) {
 258                 up->interrupt_mask1 |= SAB82532_IMR1_ALLS;
 259                 writeb(up->interrupt_mask1, &up->regs->w.imr1);
 260                 set_bit(SAB82532_ALLS, &up->irqflags);
 261         }
 262
 263 #if 0 /* bde@nwlink.com says this check causes problems */
 264         if (!(stat->sreg.isr1 & SAB82532_ISR1_XPR))
 265                 return;
 266 #endif
 267
 268         if (!(readb(&up->regs->r.star) & SAB82532_STAR_XFW))
 269                 return;
 270
 271         set_bit(SAB82532_XPR, &up->irqflags);
 272         sunsab_tx_idle(up);
 273
 274         if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
 275                 up->interrupt_mask1 |= SAB82532_IMR1_XPR;
 276                 writeb(up->interrupt_mask1, &up->regs->w.imr1);
 277                 uart_write_wakeup(&up->port);
 278                 return;
 279         }
 280
 281         up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
 282         writeb(up->interrupt_mask1, &up->regs->w.imr1);
 283         clear_bit(SAB82532_ALLS, &up->irqflags);
 284
 285         /* Stuff 32 bytes into Transmit FIFO. */
 286         clear_bit(SAB82532_XPR, &up->irqflags);
 287         for (i = 0; i < up->port.fifosize; i++) {
 288                 writeb(xmit->buf[xmit->tail],
 289                        &up->regs->w.xfifo[i]);
 290                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 291                 up->port.icount.tx++;
 292                 if (uart_circ_empty(xmit))
 293                         break;
 294         }
 295
 296         /* Issue a Transmit Frame command. */
 297         sunsab_cec_wait(up);
 298         writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
 299
 300         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 301                 uart_write_wakeup(&up->port);
 302
 303         if (uart_circ_empty(xmit))
 304                 sunsab_stop_tx(&up->port, 0);
 305 }
 306
 307 static void check_status(struct uart_sunsab_port *up,
 308                          union sab82532_irq_status *stat)
 309 {
 310         if (stat->sreg.isr0 & SAB82532_ISR0_CDSC)
 311                 uart_handle_dcd_change(&up->port,
 312                                        !(readb(&up->regs->r.vstr) & SAB82532_VSTR_CD));
 313
 314         if (stat->sreg.isr1 & SAB82532_ISR1_CSC)
 315                 uart_handle_cts_change(&up->port,
 316                                        (readb(&up->regs->r.star) & SAB82532_STAR_CTS));
 317
 318         if ((readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ^ up->dsr) {
 319                 up->dsr = (readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ? 0 : 1;
 320                 up->port.icount.dsr++;
 321         }
 322
 323         wake_up_interruptible(&up->port.info->delta_msr_wait);
 324 }
 325
 326 static irqreturn_t sunsab_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 327 {
 328         struct uart_sunsab_port *up = dev_id;
 329         struct tty_struct *tty;
 330         union sab82532_irq_status status;
 331         unsigned long flags;
 332
 333         spin_lock_irqsave(&up->port.lock, flags);
 334
 335         status.stat = 0;
 336         if (readb(&up->regs->r.gis) & SAB82532_GIS_ISA0)
 337                 status.sreg.isr0 = readb(&up->regs->r.isr0);
 338         if (readb(&up->regs->r.gis) & SAB82532_GIS_ISA1)
 339                 status.sreg.isr1 = readb(&up->regs->r.isr1);
 340
 341         tty = NULL;
 342         if (status.stat) {
 343                 if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
 344                                          SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
 345                     (status.sreg.isr1 & SAB82532_ISR1_BRK))
 346                         tty = receive_chars(up, &status, regs);
 347                 if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
 348                     (status.sreg.isr1 & SAB82532_ISR1_CSC))
 349                         check_status(up, &status);
 350                 if (status.sreg.isr1 & (SAB82532_ISR1_ALLS | SAB82532_ISR1_XPR))
 351                         transmit_chars(up, &status);
 352         }
 353
 354         spin_unlock(&up->port.lock);
 355
 356         if (tty)
 357                 tty_flip_buffer_push(tty);
 358
 359         up++;
 360
 361         spin_lock(&up->port.lock);
 362
 363         status.stat = 0;
 364         if (readb(&up->regs->r.gis) & SAB82532_GIS_ISB0)
 365                 status.sreg.isr0 = readb(&up->regs->r.isr0);
 366         if (readb(&up->regs->r.gis) & SAB82532_GIS_ISB1)
 367                 status.sreg.isr1 = readb(&up->regs->r.isr1);
 368
 369         tty = NULL;
 370         if (status.stat) {
 371                 if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
 372                                          SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
 373                     (status.sreg.isr1 & SAB82532_ISR1_BRK))
 374
 375                         tty = receive_chars(up, &status, regs);
 376                 if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
 377                     (status.sreg.isr1 & (SAB82532_ISR1_BRK | SAB82532_ISR1_CSC)))
 378                         check_status(up, &status);
 379                 if (status.sreg.isr1 & (SAB82532_ISR1_ALLS | SAB82532_ISR1_XPR))
 380                         transmit_chars(up, &status);
 381         }
 382
 383         spin_unlock_irqrestore(&up->port.lock, flags);
 384
 385         if (tty)
 386                 tty_flip_buffer_push(tty);
 387
 388         return IRQ_HANDLED;
 389 }
 390
 391 /* port->lock is not held.  */
 392 static unsigned int sunsab_tx_empty(struct uart_port *port)
 393 {
 394         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 395         int ret;
 396
 397         /* Do not need a lock for a state test like this.  */
 398         if (test_bit(SAB82532_ALLS, &up->irqflags))
 399                 ret = TIOCSER_TEMT;
 400         else
 401                 ret = 0;
 402
 403         return ret;
 404 }
 405
 406 /* port->lock held by caller.  */
 407 static void sunsab_set_mctrl(struct uart_port *port, unsigned int mctrl)
 408 {
 409         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 410
 411         if (mctrl & TIOCM_RTS) {
 412                 up->cached_mode &= ~SAB82532_MODE_FRTS;
 413                 up->cached_mode |= SAB82532_MODE_RTS;
 414         } else {
 415                 up->cached_mode |= (SAB82532_MODE_FRTS |
 416                                     SAB82532_MODE_RTS);
 417         }
 418         if (mctrl & TIOCM_DTR) {
 419                 up->cached_pvr &= ~(up->pvr_dtr_bit);
 420         } else {
 421                 up->cached_pvr |= up->pvr_dtr_bit;
 422         }
 423
 424         set_bit(SAB82532_REGS_PENDING, &up->irqflags);
 425         if (test_bit(SAB82532_XPR, &up->irqflags))
 426                 sunsab_tx_idle(up);
 427 }
 428
 429 /* port->lock is held by caller and interrupts are disabled.  */
 430 static unsigned int sunsab_get_mctrl(struct uart_port *port)
 431 {
 432         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 433         unsigned char val;
 434         unsigned int result;
 435
 436         result = 0;
 437
 438         val = readb(&up->regs->r.pvr);
 439         result |= (val & up->pvr_dsr_bit) ? 0 : TIOCM_DSR;
 440
 441         val = readb(&up->regs->r.vstr);
 442         result |= (val & SAB82532_VSTR_CD) ? 0 : TIOCM_CAR;
 443
 444         val = readb(&up->regs->r.star);
 445         result |= (val & SAB82532_STAR_CTS) ? TIOCM_CTS : 0;
 446
 447         return result;
 448 }
 449
 450 /* port->lock held by caller.  */
 451 static void sunsab_stop_tx(struct uart_port *port, unsigned int tty_stop)
 452 {
 453         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 454
 455         up->interrupt_mask1 |= SAB82532_IMR1_XPR;
 456         writeb(up->interrupt_mask1, &up->regs->w.imr1);
 457 }
 458
 459 /* port->lock held by caller.  */
 460 static void sunsab_tx_idle(struct uart_sunsab_port *up)
 461 {
 462         if (test_bit(SAB82532_REGS_PENDING, &up->irqflags)) {
 463                 u8 tmp;
 464
 465                 clear_bit(SAB82532_REGS_PENDING, &up->irqflags);
 466                 writeb(up->cached_mode, &up->regs->rw.mode);
 467                 writeb(up->cached_pvr, &up->regs->rw.pvr);
 468                 writeb(up->cached_dafo, &up->regs->w.dafo);
 469
 470                 writeb(up->cached_ebrg & 0xff, &up->regs->w.bgr);
 471                 tmp = readb(&up->regs->rw.ccr2);
 472                 tmp &= ~0xc0;
 473                 tmp |= (up->cached_ebrg >> 2) & 0xc0;
 474                 writeb(tmp, &up->regs->rw.ccr2);
 475         }
 476 }
 477
 478 /* port->lock held by caller.  */
 479 static void sunsab_start_tx(struct uart_port *port, unsigned int tty_start)
 480 {
 481         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 482         struct circ_buf *xmit = &up->port.info->xmit;
 483         int i;
 484
 485         up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
 486         writeb(up->interrupt_mask1, &up->regs->w.imr1);
 487
 488         if (!test_bit(SAB82532_XPR, &up->irqflags))
 489                 return;
 490
 491         clear_bit(SAB82532_ALLS, &up->irqflags);
 492         clear_bit(SAB82532_XPR, &up->irqflags);
 493
 494         for (i = 0; i < up->port.fifosize; i++) {
 495                 writeb(xmit->buf[xmit->tail],
 496                        &up->regs->w.xfifo[i]);
 497                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 498                 up->port.icount.tx++;
 499                 if (uart_circ_empty(xmit))
 500                         break;
 501         }
 502
 503         /* Issue a Transmit Frame command.  */
 504         sunsab_cec_wait(up);
 505         writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
 506 }
 507
 508 /* port->lock is not held.  */
 509 static void sunsab_send_xchar(struct uart_port *port, char ch)
 510 {
 511         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 512         unsigned long flags;
 513
 514         spin_lock_irqsave(&up->port.lock, flags);
 515
 516         sunsab_tec_wait(up);
 517         writeb(ch, &up->regs->w.tic);
 518
 519         spin_unlock_irqrestore(&up->port.lock, flags);
 520 }
 521
 522 /* port->lock held by caller.  */
 523 static void sunsab_stop_rx(struct uart_port *port)
 524 {
 525         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 526
 527         up->interrupt_mask0 |= SAB82532_ISR0_TCD;
 528         writeb(up->interrupt_mask1, &up->regs->w.imr0);
 529 }
 530
 531 /* port->lock held by caller.  */
 532 static void sunsab_enable_ms(struct uart_port *port)
 533 {
 534         /* For now we always receive these interrupts.  */
 535 }
 536
 537 /* port->lock is not held.  */
 538 static void sunsab_break_ctl(struct uart_port *port, int break_state)
 539 {
 540         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 541         unsigned long flags;
 542         unsigned char val;
 543
 544         spin_lock_irqsave(&up->port.lock, flags);
 545
 546         val = up->cached_dafo;
 547         if (break_state)
 548                 val |= SAB82532_DAFO_XBRK;
 549         else
 550                 val &= ~SAB82532_DAFO_XBRK;
 551         up->cached_dafo = val;
 552
 553         set_bit(SAB82532_REGS_PENDING, &up->irqflags);
 554         if (test_bit(SAB82532_XPR, &up->irqflags))
 555                 sunsab_tx_idle(up);
 556
 557         spin_unlock_irqrestore(&up->port.lock, flags);
 558 }
 559
 560 /* port->lock is not held.  */
 561 static int sunsab_startup(struct uart_port *port)
 562 {
 563         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 564         unsigned long flags;
 565         unsigned char tmp;
 566
 567         spin_lock_irqsave(&up->port.lock, flags);
 568
 569         /*
 570          * Wait for any commands or immediate characters
 571          */
 572         sunsab_cec_wait(up);
 573         sunsab_tec_wait(up);
 574
 575         /*
 576          * Clear the FIFO buffers.
 577          */
 578         writeb(SAB82532_CMDR_RRES, &up->regs->w.cmdr);
 579         sunsab_cec_wait(up);
 580         writeb(SAB82532_CMDR_XRES, &up->regs->w.cmdr);
 581
 582         /*
 583          * Clear the interrupt registers.
 584          */
 585         (void) readb(&up->regs->r.isr0);
 586         (void) readb(&up->regs->r.isr1);
 587
 588         /*
 589          * Now, initialize the UART
 590          */
 591         writeb(0, &up->regs->w.ccr0);                           /* power-down */
 592         writeb(SAB82532_CCR0_MCE | SAB82532_CCR0_SC_NRZ |
 593                SAB82532_CCR0_SM_ASYNC, &up->regs->w.ccr0);
 594         writeb(SAB82532_CCR1_ODS | SAB82532_CCR1_BCR | 7, &up->regs->w.ccr1);
 595         writeb(SAB82532_CCR2_BDF | SAB82532_CCR2_SSEL |
 596                SAB82532_CCR2_TOE, &up->regs->w.ccr2);
 597         writeb(0, &up->regs->w.ccr3);
 598         writeb(SAB82532_CCR4_MCK4 | SAB82532_CCR4_EBRG, &up->regs->w.ccr4);
 599         up->cached_mode = (SAB82532_MODE_RTS | SAB82532_MODE_FCTS |
 600                            SAB82532_MODE_RAC);
 601         writeb(up->cached_mode, &up->regs->w.mode);
 602         writeb(SAB82532_RFC_DPS|SAB82532_RFC_RFTH_32, &up->regs->w.rfc);
 603
 604         tmp = readb(&up->regs->rw.ccr0);
 605         tmp |= SAB82532_CCR0_PU;        /* power-up */
 606         writeb(tmp, &up->regs->rw.ccr0);
 607
 608         /*
 609          * Finally, enable interrupts
 610          */
 611         up->interrupt_mask0 = (SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
 612                                SAB82532_IMR0_PLLA);
 613         writeb(up->interrupt_mask0, &up->regs->w.imr0);
 614         up->interrupt_mask1 = (SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
 615                                SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
 616                                SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
 617                                SAB82532_IMR1_XPR);
 618         writeb(up->interrupt_mask1, &up->regs->w.imr1);
 619         set_bit(SAB82532_ALLS, &up->irqflags);
 620         set_bit(SAB82532_XPR, &up->irqflags);
 621
 622         spin_unlock_irqrestore(&up->port.lock, flags);
 623
 624         return 0;
 625 }
 626
 627 /* port->lock is not held.  */
 628 static void sunsab_shutdown(struct uart_port *port)
 629 {
 630         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 631         unsigned long flags;
 632
 633         spin_lock_irqsave(&up->port.lock, flags);
 634
 635         /* Disable Interrupts */
 636         up->interrupt_mask0 = 0xff;
 637         writeb(up->interrupt_mask0, &up->regs->w.imr0);
 638         up->interrupt_mask1 = 0xff;
 639         writeb(up->interrupt_mask1, &up->regs->w.imr1);
 640
 641         /* Disable break condition */
 642         up->cached_dafo = readb(&up->regs->rw.dafo);
 643         up->cached_dafo &= ~SAB82532_DAFO_XBRK;
 644         writeb(up->cached_dafo, &up->regs->rw.dafo);
 645
 646         /* Disable Receiver */
 647         up->cached_mode &= ~SAB82532_MODE_RAC;
 648         writeb(up->cached_mode, &up->regs->rw.mode);
 649
 650         /*
 651          * XXX FIXME
 652          *
 653          * If the chip is powered down here the system hangs/crashes during
 654          * reboot or shutdown.  This needs to be investigated further,
 655          * similar behaviour occurs in 2.4 when the driver is configured
 656          * as a module only.  One hint may be that data is sometimes
 657          * transmitted at 9600 baud during shutdown (regardless of the
 658          * speed the chip was configured for when the port was open).
 659          */
 660 #if 0
 661         /* Power Down */
 662         tmp = readb(&up->regs->rw.ccr0);
 663         tmp &= ~SAB82532_CCR0_PU;
 664         writeb(tmp, &up->regs->rw.ccr0);
 665 #endif
 666
 667         spin_unlock_irqrestore(&up->port.lock, flags);
 668 }
 669
 670 /*
 671  * This is used to figure out the divisor speeds.
 672  *
 673  * The formula is:    Baud = SAB_BASE_BAUD / ((N + 1) * (1 << M)),
 674  *
 675  * with               0 <= N < 64 and 0 <= M < 16
 676  */
 677
 678 static void calc_ebrg(int baud, int *n_ret, int *m_ret)
 679 {
 680         int     n, m;
 681
 682         if (baud == 0) {
 683                 *n_ret = 0;
 684                 *m_ret = 0;
 685                 return;
 686         }
 687
 688         /*
 689          * We scale numbers by 10 so that we get better accuracy
 690          * without having to use floating point.  Here we increment m
 691          * until n is within the valid range.
 692          */
 693         n = (SAB_BASE_BAUD * 10) / baud;
 694         m = 0;
 695         while (n >= 640) {
 696                 n = n / 2;
 697                 m++;
 698         }
 699         n = (n+5) / 10;
 700         /*
 701          * We try very hard to avoid speeds with M == 0 since they may
 702          * not work correctly for XTAL frequences above 10 MHz.
 703          */
 704         if ((m == 0) && ((n & 1) == 0)) {
 705                 n = n / 2;
 706                 m++;
 707         }
 708         *n_ret = n - 1;
 709         *m_ret = m;
 710 }
 711
 712 /* Internal routine, port->lock is held and local interrupts are disabled.  */
 713 static void sunsab_convert_to_sab(struct uart_sunsab_port *up, unsigned int cflag,
 714                                   unsigned int iflag, unsigned int baud,
 715                                   unsigned int quot)
 716 {
 717         unsigned char dafo;
 718         int bits, n, m;
 719
 720         /* Byte size and parity */
 721         switch (cflag & CSIZE) {
 722               case CS5: dafo = SAB82532_DAFO_CHL5; bits = 7; break;
 723               case CS6: dafo = SAB82532_DAFO_CHL6; bits = 8; break;
 724               case CS7: dafo = SAB82532_DAFO_CHL7; bits = 9; break;
 725               case CS8: dafo = SAB82532_DAFO_CHL8; bits = 10; break;
 726               /* Never happens, but GCC is too dumb to figure it out */
 727               default:  dafo = SAB82532_DAFO_CHL5; bits = 7; break;
 728         }
 729
 730         if (cflag & CSTOPB) {
 731                 dafo |= SAB82532_DAFO_STOP;
 732                 bits++;
 733         }
 734
 735         if (cflag & PARENB) {
 736                 dafo |= SAB82532_DAFO_PARE;
 737                 bits++;
 738         }
 739
 740         if (cflag & PARODD) {
 741                 dafo |= SAB82532_DAFO_PAR_ODD;
 742         } else {
 743                 dafo |= SAB82532_DAFO_PAR_EVEN;
 744         }
 745         up->cached_dafo = dafo;
 746
 747         calc_ebrg(baud, &n, &m);
 748
 749         up->cached_ebrg = n | (m << 6);
 750
 751         up->tec_timeout = (10 * 1000000) / baud;
 752         up->cec_timeout = up->tec_timeout >> 2;
 753
 754         /* CTS flow control flags */
 755         /* We encode read_status_mask and ignore_status_mask like so:
 756          *
 757          * ---------------------
 758          * | ... | ISR1 | ISR0 |
 759          * ---------------------
 760          *  ..    15   8 7    0
 761          */
 762
 763         up->port.read_status_mask = (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
 764                                      SAB82532_ISR0_RFO | SAB82532_ISR0_RPF |
 765                                      SAB82532_ISR0_CDSC);
 766         up->port.read_status_mask |= (SAB82532_ISR1_CSC |
 767                                       SAB82532_ISR1_ALLS |
 768                                       SAB82532_ISR1_XPR) << 8;
 769         if (iflag & INPCK)
 770                 up->port.read_status_mask |= (SAB82532_ISR0_PERR |
 771                                               SAB82532_ISR0_FERR);
 772         if (iflag & (BRKINT | PARMRK))
 773                 up->port.read_status_mask |= (SAB82532_ISR1_BRK << 8);
 774
 775         /*
 776          * Characteres to ignore
 777          */
 778         up->port.ignore_status_mask = 0;
 779         if (iflag & IGNPAR)
 780                 up->port.ignore_status_mask |= (SAB82532_ISR0_PERR |
 781                                                 SAB82532_ISR0_FERR);
 782         if (iflag & IGNBRK) {
 783                 up->port.ignore_status_mask |= (SAB82532_ISR1_BRK << 8);
 784                 /*
 785                  * If we're ignoring parity and break indicators,
 786                  * ignore overruns too (for real raw support).
 787                  */
 788                 if (iflag & IGNPAR)
 789                         up->port.ignore_status_mask |= SAB82532_ISR0_RFO;
 790         }
 791
 792         /*
 793          * ignore all characters if CREAD is not set
 794          */
 795         if ((cflag & CREAD) == 0)
 796                 up->port.ignore_status_mask |= (SAB82532_ISR0_RPF |
 797                                                 SAB82532_ISR0_TCD);
 798
 799         uart_update_timeout(&up->port, cflag,
 800                             (up->port.uartclk / (16 * quot)));
 801
 802         /* Now schedule a register update when the chip's
 803          * transmitter is idle.
 804          */
 805         up->cached_mode |= SAB82532_MODE_RAC;
 806         set_bit(SAB82532_REGS_PENDING, &up->irqflags);
 807         if (test_bit(SAB82532_XPR, &up->irqflags))
 808                 sunsab_tx_idle(up);
 809 }
 810
 811 /* port->lock is not held.  */
 812 static void sunsab_set_termios(struct uart_port *port, struct termios *termios,
 813                                struct termios *old)
 814 {
 815         struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
 816         unsigned long flags;
 817         unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
 818         unsigned int quot = uart_get_divisor(port, baud);
 819
 820         spin_lock_irqsave(&up->port.lock, flags);
 821         sunsab_convert_to_sab(up, termios->c_cflag, termios->c_iflag, baud, quot);
 822         spin_unlock_irqrestore(&up->port.lock, flags);
 823 }
 824
 825 static const char *sunsab_type(struct uart_port *port)
 826 {
 827         struct uart_sunsab_port *up = (void *)port;
 828         static char buf[36];
 829
 830         sprintf(buf, "SAB82532 %s", sab82532_version[up->type]);
 831         return buf;
 832 }
 833
 834 static void sunsab_release_port(struct uart_port *port)
 835 {
 836 }
 837
 838 static int sunsab_request_port(struct uart_port *port)
 839 {
 840         return 0;
 841 }
 842
 843 static void sunsab_config_port(struct uart_port *port, int flags)
 844 {
 845 }
 846
 847 static int sunsab_verify_port(struct uart_port *port, struct serial_struct *ser)
 848 {
 849         return -EINVAL;
 850 }
 851
 852 static struct uart_ops sunsab_pops = {
 853         .tx_empty       = sunsab_tx_empty,
 854         .set_mctrl      = sunsab_set_mctrl,
 855         .get_mctrl      = sunsab_get_mctrl,
 856         .stop_tx        = sunsab_stop_tx,
 857         .start_tx       = sunsab_start_tx,
 858         .send_xchar     = sunsab_send_xchar,
 859         .stop_rx        = sunsab_stop_rx,
 860         .enable_ms      = sunsab_enable_ms,
 861         .break_ctl      = sunsab_break_ctl,
 862         .startup        = sunsab_startup,
 863         .shutdown       = sunsab_shutdown,
 864         .set_termios    = sunsab_set_termios,
 865         .type           = sunsab_type,
 866         .release_port   = sunsab_release_port,
 867         .request_port   = sunsab_request_port,
 868         .config_port    = sunsab_config_port,
 869         .verify_port    = sunsab_verify_port,
 870 };
 871
 872 static struct uart_driver sunsab_reg = {
 873         .owner                  = THIS_MODULE,
 874         .driver_name            = "serial",
 875         .devfs_name             = "tts/",
 876         .dev_name               = "ttyS",
 877         .major                  = TTY_MAJOR,
 878 };
 879
 880 static struct uart_sunsab_port *sunsab_ports;
 881 static int num_channels;
 882
 883 #ifdef CONFIG_SERIAL_SUNSAB_CONSOLE
 884
 885 static __inline__ void sunsab_console_putchar(struct uart_sunsab_port *up, char c)
 886 {
 887         unsigned long flags;
 888
 889         spin_lock_irqsave(&up->port.lock, flags);
 890
 891         sunsab_tec_wait(up);
 892         writeb(c, &up->regs->w.tic);
 893
 894         spin_unlock_irqrestore(&up->port.lock, flags);
 895 }
 896
 897 static void sunsab_console_write(struct console *con, const char *s, unsigned n)
 898 {
 899         struct uart_sunsab_port *up = &sunsab_ports[con->index];
 900         int i;
 901
 902         for (i = 0; i < n; i++) {
 903                 if (*s == '\n')
 904                         sunsab_console_putchar(up, '\r');
 905                 sunsab_console_putchar(up, *s++);
 906         }
 907         sunsab_tec_wait(up);
 908 }
 909
 910 static int sunsab_console_setup(struct console *con, char *options)
 911 {
 912         struct uart_sunsab_port *up = &sunsab_ports[con->index];
 913         unsigned long flags;
 914         unsigned int baud, quot;
 915
 916         printk("Console: ttyS%d (SAB82532)\n",
 917                (sunsab_reg.minor - 64) + con->index);
 918
 919         sunserial_console_termios(con);
 920
 921         /* Firmware console speed is limited to 150-->38400 baud so
 922          * this hackish cflag thing is OK.
 923          */
 924         switch (con->cflag & CBAUD) {
 925         case B150: baud = 150; break;
 926         case B300: baud = 300; break;
 927         case B600: baud = 600; break;
 928         case B1200: baud = 1200; break;
 929         case B2400: baud = 2400; break;
 930         case B4800: baud = 4800; break;
 931         default: case B9600: baud = 9600; break;
 932         case B19200: baud = 19200; break;
 933         case B38400: baud = 38400; break;
 934         };
 935
 936         /*
 937          * Temporary fix.
 938          */
 939         spin_lock_init(&up->port.lock);
 940
 941         /*
 942          * Initialize the hardware
 943          */
 944         sunsab_startup(&up->port);
 945
 946         spin_lock_irqsave(&up->port.lock, flags);
 947
 948         /*
 949          * Finally, enable interrupts
 950          */
 951         up->interrupt_mask0 = SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
 952                                 SAB82532_IMR0_PLLA | SAB82532_IMR0_CDSC;
 953         writeb(up->interrupt_mask0, &up->regs->w.imr0);
 954         up->interrupt_mask1 = SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
 955                                 SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
 956                                 SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
 957                                 SAB82532_IMR1_XPR;
 958         writeb(up->interrupt_mask1, &up->regs->w.imr1);
 959
 960         quot = uart_get_divisor(&up->port, baud);
 961         sunsab_convert_to_sab(up, con->cflag, 0, baud, quot);
 962         sunsab_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
 963
 964         spin_unlock_irqrestore(&up->port.lock, flags);
 965
 966         return 0;
 967 }
 968
 969 static struct console sunsab_console = {
 970         .name   =       "ttyS",
 971         .write  =       sunsab_console_write,
 972         .device =       uart_console_device,
 973         .setup  =       sunsab_console_setup,
 974         .flags  =       CON_PRINTBUFFER,
 975         .index  =       -1,
 976         .data   =       &sunsab_reg,
 977 };
 978 #define SUNSAB_CONSOLE  (&sunsab_console)
 979
 980 static void __init sunsab_console_init(void)
 981 {
 982         int i;
 983
 984         if (con_is_present())
 985                 return;
 986
 987         for (i = 0; i < num_channels; i++) {
 988                 int this_minor = sunsab_reg.minor + i;
 989
 990                 if ((this_minor - 64) == (serial_console - 1))
 991                         break;
 992         }
 993         if (i == num_channels)
 994                 return;
 995
 996         sunsab_console.index = i;
 997         register_console(&sunsab_console);
 998 }
 999 #else
1000 #define SUNSAB_CONSOLE          (NULL)
1001 #define sunsab_console_init()   do { } while (0)
1002 #endif
1003
1004 static void __init for_each_sab_edev(void (*callback)(struct linux_ebus_device *, void *), void *arg)
1005 {
1006         struct linux_ebus *ebus;
1007         struct linux_ebus_device *edev = NULL;
1008
1009         for_each_ebus(ebus) {
1010                 for_each_ebusdev(edev, ebus) {
1011                         if (!strcmp(edev->prom_name, "se")) {
1012                                 callback(edev, arg);
1013                                 continue;
1014                         } else if (!strcmp(edev->prom_name, "serial")) {
1015                                 char compat[32];
1016                                 int clen;
1017
1018                                 /* On RIO this can be an SE, check it.  We could
1019                                  * just check ebus->is_rio, but this is more portable.
1020                                  */
1021                                 clen = prom_getproperty(edev->prom_node, "compatible",
1022                                                         compat, sizeof(compat));
1023                                 if (clen > 0) {
1024                                         if (strncmp(compat, "sab82532", 8) == 0) {
1025                                                 callback(edev, arg);
1026                                                 continue;
1027                                         }
1028                                 }
1029                         }
1030                 }
1031         }
1032 }
1033
1034 static void __init sab_count_callback(struct linux_ebus_device *edev, void *arg)
1035 {
1036         int *count_p = arg;
1037
1038         (*count_p)++;
1039 }
1040
1041 static void __init sab_attach_callback(struct linux_ebus_device *edev, void *arg)
1042 {
1043         int *instance_p = arg;
1044         struct uart_sunsab_port *up;
1045         unsigned long regs, offset;
1046         int i;
1047
1048         /* Note: ports are located in reverse order */
1049         regs = edev->resource[0].start;
1050         offset = sizeof(union sab82532_async_regs);
1051         for (i = 0; i < 2; i++) {
1052                 up = &sunsab_ports[(*instance_p * 2) + 1 - i];
1053
1054                 memset(up, 0, sizeof(*up));
1055                 up->regs = ioremap(regs + offset, sizeof(union sab82532_async_regs));
1056                 up->port.irq = edev->irqs[0];
1057                 up->port.fifosize = SAB82532_XMIT_FIFO_SIZE;
1058                 up->port.mapbase = (unsigned long)up->regs;
1059                 up->port.iotype = SERIAL_IO_MEM;
1060
1061                 writeb(SAB82532_IPC_IC_ACT_LOW, &up->regs->w.ipc);
1062
1063                 offset -= sizeof(union sab82532_async_regs);
1064         }
1065
1066         (*instance_p)++;
1067 }
1068
1069 static int __init probe_for_sabs(void)
1070 {
1071         int this_sab = 0;
1072
1073         /* Find device instances.  */
1074         for_each_sab_edev(&sab_count_callback, &this_sab);
1075         if (!this_sab)
1076                 return -ENODEV;
1077
1078         /* Allocate tables.  */
1079         sunsab_ports = kmalloc(sizeof(struct uart_sunsab_port) * this_sab * 2,
1080                                GFP_KERNEL);
1081         if (!sunsab_ports)
1082                 return -ENOMEM;
1083
1084         num_channels = this_sab * 2;
1085
1086         this_sab = 0;
1087         for_each_sab_edev(&sab_attach_callback, &this_sab);
1088         return 0;
1089 }
1090
1091 static void __init sunsab_init_hw(void)
1092 {
1093         int i;
1094
1095         for (i = 0; i < num_channels; i++) {
1096                 struct uart_sunsab_port *up = &sunsab_ports[i];
1097
1098                 up->port.line = i;
1099                 up->port.ops = &sunsab_pops;
1100                 up->port.type = PORT_SUNSAB;
1101                 up->port.uartclk = SAB_BASE_BAUD;
1102
1103                 up->type = readb(&up->regs->r.vstr) & 0x0f;
1104                 writeb(~((1 << 1) | (1 << 2) | (1 << 4)), &up->regs->w.pcr);
1105                 writeb(0xff, &up->regs->w.pim);
1106                 if (up->port.line == 0) {
1107                         up->pvr_dsr_bit = (1 << 0);
1108                         up->pvr_dtr_bit = (1 << 1);
1109                 } else {
1110                         up->pvr_dsr_bit = (1 << 3);
1111                         up->pvr_dtr_bit = (1 << 2);
1112                 }
1113                 up->cached_pvr = (1 << 1) | (1 << 2) | (1 << 4);
1114                 writeb(up->cached_pvr, &up->regs->w.pvr);
1115                 up->cached_mode = readb(&up->regs->rw.mode);
1116                 up->cached_mode |= SAB82532_MODE_FRTS;
1117                 writeb(up->cached_mode, &up->regs->rw.mode);
1118                 up->cached_mode |= SAB82532_MODE_RTS;
1119                 writeb(up->cached_mode, &up->regs->rw.mode);
1120
1121                 up->tec_timeout = SAB82532_MAX_TEC_TIMEOUT;
1122                 up->cec_timeout = SAB82532_MAX_CEC_TIMEOUT;
1123
1124                 if (!(up->port.line & 0x01)) {
1125                         if (request_irq(up->port.irq, sunsab_interrupt,
1126                                         SA_SHIRQ, "serial(sab82532)", up)) {
1127                                 printk("sunsab%d: can't get IRQ %x\n",
1128                                        i, up->port.irq);
1129                                 continue;
1130                         }
1131                 }
1132         }
1133 }
1134
1135 static int __init sunsab_init(void)
1136 {
1137         int ret = probe_for_sabs();
1138         int i;
1139
1140         if (ret < 0)
1141                 return ret;
1142
1143         sunsab_init_hw();
1144
1145         sunsab_reg.minor = sunserial_current_minor;
1146         sunsab_reg.nr = num_channels;
1147         sunsab_reg.cons = SUNSAB_CONSOLE;
1148
1149         ret = uart_register_driver(&sunsab_reg);
1150         if (ret < 0) {
1151                 int i;
1152
1153                 for (i = 0; i < num_channels; i++) {
1154                         struct uart_sunsab_port *up = &sunsab_ports[i];
1155
1156                         if (!(up->port.line & 0x01))
1157                                 free_irq(up->port.irq, up);
1158                         iounmap(up->regs);
1159                 }
1160                 kfree(sunsab_ports);
1161                 sunsab_ports = NULL;
1162
1163                 return ret;
1164         }
1165
1166         sunserial_current_minor += num_channels;
1167
1168         sunsab_console_init();
1169
1170         for (i = 0; i < num_channels; i++) {
1171                 struct uart_sunsab_port *up = &sunsab_ports[i];
1172
1173                 uart_add_one_port(&sunsab_reg, &up->port);
1174         }
1175
1176         return 0;
1177 }
1178
1179 static void __exit sunsab_exit(void)
1180 {
1181         int i;
1182
1183         for (i = 0; i < num_channels; i++) {
1184                 struct uart_sunsab_port *up = &sunsab_ports[i];
1185
1186                 uart_remove_one_port(&sunsab_reg, &up->port);
1187
1188                 if (!(up->port.line & 0x01))
1189                         free_irq(up->port.irq, up);
1190                 iounmap(up->regs);
1191         }
1192
1193         sunserial_current_minor -= num_channels;
1194         uart_unregister_driver(&sunsab_reg);
1195
1196         kfree(sunsab_ports);
1197         sunsab_ports = NULL;
1198 }
1199
1200 module_init(sunsab_init);
1201 module_exit(sunsab_exit);
1202
1203 MODULE_AUTHOR("Eddie C. Dost and David S. Miller");
1204 MODULE_DESCRIPTION("Sun SAB82532 serial port driver");
1205 MODULE_LICENSE("GPL");