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@redhat.com), 2002-Jul-29
  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/spinlock.h>
  23 #include <linux/errno.h>
  24 #include <linux/tty.h>
  25 #include <linux/tty_flip.h>
  26 #include <linux/major.h>
  27 #include <linux/string.h>
  28 #include <linux/ptrace.h>
  29 #include <linux/ioport.h>
  30 #include <linux/circ_buf.h>
  31 #include <linux/serial.h>
  32 #include <linux/sysrq.h>
  33 #include <linux/console.h>
  34 #ifdef CONFIG_SERIO
  35 #include <linux/serio.h>
  36 #endif
  37 #include <linux/serial_reg.h>
  38 #include <linux/init.h>
  39 #include <linux/delay.h>
  40
  41 #include <asm/io.h>
  42 #include <asm/irq.h>
  43 #include <asm/oplib.h>
  44 #include <asm/ebus.h>
  45 #ifdef CONFIG_SPARC64
  46 #include <asm/isa.h>
  47 #endif
  48
  49 #if defined(CONFIG_SERIAL_SUNSU_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  50 #define SUPPORT_SYSRQ
  51 #endif
  52
  53 #include <linux/serial_core.h>
  54
  55 #include "suncore.h"
  56
  57 /* We are on a NS PC87303 clocked with 24.0 MHz, which results
  58  * in a UART clock of 1.8462 MHz.
  59  */
  60 #define SU_BASE_BAUD    (1846200 / 16)
  61
  62 enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT };
  63 static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" };
  64
  65 /*
  66  * Here we define the default xmit fifo size used for each type of UART.
  67  */
  68 static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = {
  69         { "unknown",    1,      0 },
  70         { "8250",       1,      0 },
  71         { "16450",      1,      0 },
  72         { "16550",      1,      0 },
  73         { "16550A",     16,     UART_CLEAR_FIFO | UART_USE_FIFO },
  74         { "Cirrus",     1,      0 },
  75         { "ST16650",    1,      UART_CLEAR_FIFO | UART_STARTECH },
  76         { "ST16650V2",  32,     UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
  77         { "TI16750",    64,     UART_CLEAR_FIFO | UART_USE_FIFO },
  78         { "Startech",   1,      0 },
  79         { "16C950/954", 128,    UART_CLEAR_FIFO | UART_USE_FIFO },
  80         { "ST16654",    64,     UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
  81         { "XR16850",    128,    UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
  82         { "RSA",        2048,   UART_CLEAR_FIFO | UART_USE_FIFO }
  83 };
  84
  85 struct uart_sunsu_port {
  86         struct uart_port        port;
  87         unsigned char           acr;
  88         unsigned char           ier;
  89         unsigned short          rev;
  90         unsigned char           lcr;
  91         unsigned int            lsr_break_flag;
  92         unsigned int            cflag;
  93
  94         /* Probing information.  */
  95         enum su_type            su_type;
  96         unsigned int            type_probed;    /* XXX Stupid */
  97         int                     port_node;
  98
  99 #ifdef CONFIG_SERIO
 100         struct serio            *serio;
 101         int                     serio_open;
 102 #endif
 103 };
 104
 105 #define _INLINE_
 106
 107 static _INLINE_ unsigned int serial_in(struct uart_sunsu_port *up, int offset)
 108 {
 109         offset <<= up->port.regshift;
 110
 111         switch (up->port.iotype) {
 112         case SERIAL_IO_HUB6:
 113                 outb(up->port.hub6 - 1 + offset, up->port.iobase);
 114                 return inb(up->port.iobase + 1);
 115
 116         case SERIAL_IO_MEM:
 117                 return readb(up->port.membase + offset);
 118
 119         default:
 120                 return inb(up->port.iobase + offset);
 121         }
 122 }
 123
 124 static _INLINE_ void
 125 serial_out(struct uart_sunsu_port *up, int offset, int value)
 126 {
 127 #ifndef CONFIG_SPARC64
 128         /*
 129          * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
 130          * connected with a gate then go to SlavIO. When IRQ4 goes tristated
 131          * gate outputs a logical one. Since we use level triggered interrupts
 132          * we have lockup and watchdog reset. We cannot mask IRQ because
 133          * keyboard shares IRQ with us (Word has it as Bob Smelik's design).
 134          * This problem is similar to what Alpha people suffer, see serial.c.
 135          */
 136         if (offset == UART_MCR)
 137                 value |= UART_MCR_OUT2;
 138 #endif
 139         offset <<= up->port.regshift;
 140
 141         switch (up->port.iotype) {
 142         case SERIAL_IO_HUB6:
 143                 outb(up->port.hub6 - 1 + offset, up->port.iobase);
 144                 outb(value, up->port.iobase + 1);
 145                 break;
 146
 147         case SERIAL_IO_MEM:
 148                 writeb(value, up->port.membase + offset);
 149                 break;
 150
 151         default:
 152                 outb(value, up->port.iobase + offset);
 153         }
 154 }
 155
 156 /*
 157  * We used to support using pause I/O for certain machines.  We
 158  * haven't supported this for a while, but just in case it's badly
 159  * needed for certain old 386 machines, I've left these #define's
 160  * in....
 161  */
 162 #define serial_inp(up, offset)          serial_in(up, offset)
 163 #define serial_outp(up, offset, value)  serial_out(up, offset, value)
 164
 165
 166 /*
 167  * For the 16C950
 168  */
 169 static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
 170 {
 171         serial_out(up, UART_SCR, offset);
 172         serial_out(up, UART_ICR, value);
 173 }
 174
 175 #if 0 /* Unused currently */
 176 static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset)
 177 {
 178         unsigned int value;
 179
 180         serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
 181         serial_out(up, UART_SCR, offset);
 182         value = serial_in(up, UART_ICR);
 183         serial_icr_write(up, UART_ACR, up->acr);
 184
 185         return value;
 186 }
 187 #endif
 188
 189 #ifdef CONFIG_SERIAL_8250_RSA
 190 /*
 191  * Attempts to turn on the RSA FIFO.  Returns zero on failure.
 192  * We set the port uart clock rate if we succeed.
 193  */
 194 static int __enable_rsa(struct uart_sunsu_port *up)
 195 {
 196         unsigned char mode;
 197         int result;
 198
 199         mode = serial_inp(up, UART_RSA_MSR);
 200         result = mode & UART_RSA_MSR_FIFO;
 201
 202         if (!result) {
 203                 serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
 204                 mode = serial_inp(up, UART_RSA_MSR);
 205                 result = mode & UART_RSA_MSR_FIFO;
 206         }
 207
 208         if (result)
 209                 up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
 210
 211         return result;
 212 }
 213
 214 static void enable_rsa(struct uart_sunsu_port *up)
 215 {
 216         if (up->port.type == PORT_RSA) {
 217                 if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
 218                         spin_lock_irq(&up->port.lock);
 219                         __enable_rsa(up);
 220                         spin_unlock_irq(&up->port.lock);
 221                 }
 222                 if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
 223                         serial_outp(up, UART_RSA_FRR, 0);
 224         }
 225 }
 226
 227 /*
 228  * Attempts to turn off the RSA FIFO.  Returns zero on failure.
 229  * It is unknown why interrupts were disabled in here.  However,
 230  * the caller is expected to preserve this behaviour by grabbing
 231  * the spinlock before calling this function.
 232  */
 233 static void disable_rsa(struct uart_sunsu_port *up)
 234 {
 235         unsigned char mode;
 236         int result;
 237
 238         if (up->port.type == PORT_RSA &&
 239             up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
 240                 spin_lock_irq(&up->port.lock);
 241
 242                 mode = serial_inp(up, UART_RSA_MSR);
 243                 result = !(mode & UART_RSA_MSR_FIFO);
 244
 245                 if (!result) {
 246                         serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
 247                         mode = serial_inp(up, UART_RSA_MSR);
 248                         result = !(mode & UART_RSA_MSR_FIFO);
 249                 }
 250
 251                 if (result)
 252                         up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
 253                 spin_unlock_irq(&up->port.lock);
 254         }
 255 }
 256 #endif /* CONFIG_SERIAL_8250_RSA */
 257
 258 static inline void __stop_tx(struct uart_sunsu_port *p)
 259 {
 260         if (p->ier & UART_IER_THRI) {
 261                 p->ier &= ~UART_IER_THRI;
 262                 serial_out(p, UART_IER, p->ier);
 263         }
 264 }
 265
 266 static void sunsu_stop_tx(struct uart_port *port)
 267 {
 268         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 269
 270         __stop_tx(up);
 271
 272         if (up->port.type == PORT_16C950 && tty_stop /*FIXME*/) {
 273                 up->acr |= UART_ACR_TXDIS;
 274                 serial_icr_write(up, UART_ACR, up->acr);
 275         }
 276 }
 277
 278 static void sunsu_start_tx(struct uart_port *port)
 279 {
 280         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 281
 282         if (!(up->ier & UART_IER_THRI)) {
 283                 up->ier |= UART_IER_THRI;
 284                 serial_out(up, UART_IER, up->ier);
 285         }
 286         /*
 287          * We only do this from uart_start
 288          */
 289         if (tty_start && up->port.type == PORT_16C950 /*FIXME*/) {
 290                 up->acr &= ~UART_ACR_TXDIS;
 291                 serial_icr_write(up, UART_ACR, up->acr);
 292         }
 293 }
 294
 295 static void sunsu_stop_rx(struct uart_port *port)
 296 {
 297         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 298         unsigned long flags;
 299
 300         spin_lock_irqsave(&up->port.lock, flags);
 301         up->ier &= ~UART_IER_RLSI;
 302         up->port.read_status_mask &= ~UART_LSR_DR;
 303         serial_out(up, UART_IER, up->ier);
 304         spin_unlock_irqrestore(&up->port.lock, flags);
 305 }
 306
 307 static void sunsu_enable_ms(struct uart_port *port)
 308 {
 309         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 310         unsigned long flags;
 311
 312         spin_lock_irqsave(&up->port.lock, flags);
 313         up->ier |= UART_IER_MSI;
 314         serial_out(up, UART_IER, up->ier);
 315         spin_unlock_irqrestore(&up->port.lock, flags);
 316 }
 317
 318 static _INLINE_ struct tty_struct *
 319 receive_chars(struct uart_sunsu_port *up, unsigned char *status, struct pt_regs *regs)
 320 {
 321         struct tty_struct *tty = up->port.info->tty;
 322         unsigned char ch;
 323         int max_count = 256;
 324         int saw_console_brk = 0;
 325
 326         do {
 327                 if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
 328                         tty->flip.work.func((void *)tty);
 329                         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
 330                                 return tty; // if TTY_DONT_FLIP is set
 331                 }
 332                 ch = serial_inp(up, UART_RX);
 333                 *tty->flip.char_buf_ptr = ch;
 334                 *tty->flip.flag_buf_ptr = TTY_NORMAL;
 335                 up->port.icount.rx++;
 336
 337                 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
 338                                        UART_LSR_FE | UART_LSR_OE))) {
 339                         /*
 340                          * For statistics only
 341                          */
 342                         if (*status & UART_LSR_BI) {
 343                                 *status &= ~(UART_LSR_FE | UART_LSR_PE);
 344                                 up->port.icount.brk++;
 345                                 if (up->port.cons != NULL &&
 346                                     up->port.line == up->port.cons->index)
 347                                         saw_console_brk = 1;
 348                                 /*
 349                                  * We do the SysRQ and SAK checking
 350                                  * here because otherwise the break
 351                                  * may get masked by ignore_status_mask
 352                                  * or read_status_mask.
 353                                  */
 354                                 if (uart_handle_break(&up->port))
 355                                         goto ignore_char;
 356                         } else if (*status & UART_LSR_PE)
 357                                 up->port.icount.parity++;
 358                         else if (*status & UART_LSR_FE)
 359                                 up->port.icount.frame++;
 360                         if (*status & UART_LSR_OE)
 361                                 up->port.icount.overrun++;
 362
 363                         /*
 364                          * Mask off conditions which should be ingored.
 365                          */
 366                         *status &= up->port.read_status_mask;
 367
 368                         if (up->port.cons != NULL &&
 369                             up->port.line == up->port.cons->index) {
 370                                 /* Recover the break flag from console xmit */
 371                                 *status |= up->lsr_break_flag;
 372                                 up->lsr_break_flag = 0;
 373                         }
 374
 375                         if (*status & UART_LSR_BI) {
 376                                 *tty->flip.flag_buf_ptr = TTY_BREAK;
 377                         } else if (*status & UART_LSR_PE)
 378                                 *tty->flip.flag_buf_ptr = TTY_PARITY;
 379                         else if (*status & UART_LSR_FE)
 380                                 *tty->flip.flag_buf_ptr = TTY_FRAME;
 381                 }
 382                 if (uart_handle_sysrq_char(&up->port, ch, regs))
 383                         goto ignore_char;
 384                 if ((*status & up->port.ignore_status_mask) == 0) {
 385                         tty->flip.flag_buf_ptr++;
 386                         tty->flip.char_buf_ptr++;
 387                         tty->flip.count++;
 388                 }
 389                 if ((*status & UART_LSR_OE) &&
 390                     tty->flip.count < TTY_FLIPBUF_SIZE) {
 391                         /*
 392                          * Overrun is special, since it's reported
 393                          * immediately, and doesn't affect the current
 394                          * character.
 395                          */
 396                         *tty->flip.flag_buf_ptr = TTY_OVERRUN;
 397                         tty->flip.flag_buf_ptr++;
 398                         tty->flip.char_buf_ptr++;
 399                         tty->flip.count++;
 400                 }
 401         ignore_char:
 402                 *status = serial_inp(up, UART_LSR);
 403         } while ((*status & UART_LSR_DR) && (max_count-- > 0));
 404
 405         if (saw_console_brk)
 406                 sun_do_break();
 407
 408         return tty;
 409 }
 410
 411 static _INLINE_ void transmit_chars(struct uart_sunsu_port *up)
 412 {
 413         struct circ_buf *xmit = &up->port.info->xmit;
 414         int count;
 415
 416         if (up->port.x_char) {
 417                 serial_outp(up, UART_TX, up->port.x_char);
 418                 up->port.icount.tx++;
 419                 up->port.x_char = 0;
 420                 return;
 421         }
 422         if (uart_tx_stopped(&up->port)) {
 423                 sunsu_stop_tx(&up->port);
 424                 return;
 425         }
 426         if (uart_circ_empty(xmit)) {
 427                 __stop_tx(up);
 428                 return;
 429         }
 430
 431         count = up->port.fifosize;
 432         do {
 433                 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
 434                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 435                 up->port.icount.tx++;
 436                 if (uart_circ_empty(xmit))
 437                         break;
 438         } while (--count > 0);
 439
 440         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 441                 uart_write_wakeup(&up->port);
 442
 443         if (uart_circ_empty(xmit))
 444                 __stop_tx(up);
 445 }
 446
 447 static _INLINE_ void check_modem_status(struct uart_sunsu_port *up)
 448 {
 449         int status;
 450
 451         status = serial_in(up, UART_MSR);
 452
 453         if ((status & UART_MSR_ANY_DELTA) == 0)
 454                 return;
 455
 456         if (status & UART_MSR_TERI)
 457                 up->port.icount.rng++;
 458         if (status & UART_MSR_DDSR)
 459                 up->port.icount.dsr++;
 460         if (status & UART_MSR_DDCD)
 461                 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
 462         if (status & UART_MSR_DCTS)
 463                 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
 464
 465         wake_up_interruptible(&up->port.info->delta_msr_wait);
 466 }
 467
 468 static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 469 {
 470         struct uart_sunsu_port *up = dev_id;
 471         unsigned long flags;
 472         unsigned char status;
 473
 474         spin_lock_irqsave(&up->port.lock, flags);
 475
 476         do {
 477                 struct tty_struct *tty;
 478
 479                 status = serial_inp(up, UART_LSR);
 480                 tty = NULL;
 481                 if (status & UART_LSR_DR)
 482                         tty = receive_chars(up, &status, regs);
 483                 check_modem_status(up);
 484                 if (status & UART_LSR_THRE)
 485                         transmit_chars(up);
 486
 487                 spin_unlock_irqrestore(&up->port.lock, flags);
 488
 489                 if (tty)
 490                         tty_flip_buffer_push(tty);
 491
 492                 spin_lock_irqsave(&up->port.lock, flags);
 493
 494         } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));
 495
 496         spin_unlock_irqrestore(&up->port.lock, flags);
 497
 498         return IRQ_HANDLED;
 499 }
 500
 501 /* Separate interrupt handling path for keyboard/mouse ports.  */
 502
 503 static void
 504 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
 505                    unsigned int iflag, unsigned int quot);
 506
 507 static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
 508 {
 509         unsigned int cur_cflag = up->cflag;
 510         int quot, new_baud;
 511
 512         up->cflag &= ~CBAUD;
 513         up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
 514
 515         quot = up->port.uartclk / (16 * new_baud);
 516
 517         spin_unlock(&up->port.lock);
 518
 519         sunsu_change_speed(&up->port, up->cflag, 0, quot);
 520
 521         spin_lock(&up->port.lock);
 522 }
 523
 524 static void receive_kbd_ms_chars(struct uart_sunsu_port *up, struct pt_regs *regs, int is_break)
 525 {
 526         do {
 527                 unsigned char ch = serial_inp(up, UART_RX);
 528
 529                 /* Stop-A is handled by drivers/char/keyboard.c now. */
 530                 if (up->su_type == SU_PORT_KBD) {
 531 #ifdef CONFIG_SERIO
 532                         serio_interrupt(up->serio, ch, 0, regs);
 533 #endif
 534                 } else if (up->su_type == SU_PORT_MS) {
 535                         int ret = suncore_mouse_baud_detection(ch, is_break);
 536
 537                         switch (ret) {
 538                         case 2:
 539                                 sunsu_change_mouse_baud(up);
 540                                 /* fallthru */
 541                         case 1:
 542                                 break;
 543
 544                         case 0:
 545 #ifdef CONFIG_SERIO
 546                                 serio_interrupt(up->serio, ch, 0, regs);
 547 #endif
 548                                 break;
 549                         };
 550                 }
 551         } while (serial_in(up, UART_LSR) & UART_LSR_DR);
 552 }
 553
 554 static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 555 {
 556         struct uart_sunsu_port *up = dev_id;
 557
 558         if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
 559                 unsigned char status = serial_inp(up, UART_LSR);
 560
 561                 if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
 562                         receive_kbd_ms_chars(up, regs,
 563                                              (status & UART_LSR_BI) != 0);
 564         }
 565
 566         return IRQ_HANDLED;
 567 }
 568
 569 static unsigned int sunsu_tx_empty(struct uart_port *port)
 570 {
 571         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 572         unsigned long flags;
 573         unsigned int ret;
 574
 575         spin_lock_irqsave(&up->port.lock, flags);
 576         ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
 577         spin_unlock_irqrestore(&up->port.lock, flags);
 578
 579         return ret;
 580 }
 581
 582 static unsigned int sunsu_get_mctrl(struct uart_port *port)
 583 {
 584         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 585         unsigned char status;
 586         unsigned int ret;
 587
 588         status = serial_in(up, UART_MSR);
 589
 590         ret = 0;
 591         if (status & UART_MSR_DCD)
 592                 ret |= TIOCM_CAR;
 593         if (status & UART_MSR_RI)
 594                 ret |= TIOCM_RNG;
 595         if (status & UART_MSR_DSR)
 596                 ret |= TIOCM_DSR;
 597         if (status & UART_MSR_CTS)
 598                 ret |= TIOCM_CTS;
 599         return ret;
 600 }
 601
 602 static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
 603 {
 604         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 605         unsigned char mcr = 0;
 606
 607         if (mctrl & TIOCM_RTS)
 608                 mcr |= UART_MCR_RTS;
 609         if (mctrl & TIOCM_DTR)
 610                 mcr |= UART_MCR_DTR;
 611         if (mctrl & TIOCM_OUT1)
 612                 mcr |= UART_MCR_OUT1;
 613         if (mctrl & TIOCM_OUT2)
 614                 mcr |= UART_MCR_OUT2;
 615         if (mctrl & TIOCM_LOOP)
 616                 mcr |= UART_MCR_LOOP;
 617
 618         serial_out(up, UART_MCR, mcr);
 619 }
 620
 621 static void sunsu_break_ctl(struct uart_port *port, int break_state)
 622 {
 623         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 624         unsigned long flags;
 625
 626         spin_lock_irqsave(&up->port.lock, flags);
 627         if (break_state == -1)
 628                 up->lcr |= UART_LCR_SBC;
 629         else
 630                 up->lcr &= ~UART_LCR_SBC;
 631         serial_out(up, UART_LCR, up->lcr);
 632         spin_unlock_irqrestore(&up->port.lock, flags);
 633 }
 634
 635 static int sunsu_startup(struct uart_port *port)
 636 {
 637         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 638         unsigned long flags;
 639         int retval;
 640
 641         if (up->port.type == PORT_16C950) {
 642                 /* Wake up and initialize UART */
 643                 up->acr = 0;
 644                 serial_outp(up, UART_LCR, 0xBF);
 645                 serial_outp(up, UART_EFR, UART_EFR_ECB);
 646                 serial_outp(up, UART_IER, 0);
 647                 serial_outp(up, UART_LCR, 0);
 648                 serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
 649                 serial_outp(up, UART_LCR, 0xBF);
 650                 serial_outp(up, UART_EFR, UART_EFR_ECB);
 651                 serial_outp(up, UART_LCR, 0);
 652         }
 653
 654 #ifdef CONFIG_SERIAL_8250_RSA
 655         /*
 656          * If this is an RSA port, see if we can kick it up to the
 657          * higher speed clock.
 658          */
 659         enable_rsa(up);
 660 #endif
 661
 662         /*
 663          * Clear the FIFO buffers and disable them.
 664          * (they will be reeanbled in set_termios())
 665          */
 666         if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
 667                 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 668                 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 669                                 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
 670                 serial_outp(up, UART_FCR, 0);
 671         }
 672
 673         /*
 674          * Clear the interrupt registers.
 675          */
 676         (void) serial_inp(up, UART_LSR);
 677         (void) serial_inp(up, UART_RX);
 678         (void) serial_inp(up, UART_IIR);
 679         (void) serial_inp(up, UART_MSR);
 680
 681         /*
 682          * At this point, there's no way the LSR could still be 0xff;
 683          * if it is, then bail out, because there's likely no UART
 684          * here.
 685          */
 686         if (!(up->port.flags & ASYNC_BUGGY_UART) &&
 687             (serial_inp(up, UART_LSR) == 0xff)) {
 688                 printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
 689                 return -ENODEV;
 690         }
 691
 692         if (up->su_type != SU_PORT_PORT) {
 693                 retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
 694                                      SA_SHIRQ, su_typev[up->su_type], up);
 695         } else {
 696                 retval = request_irq(up->port.irq, sunsu_serial_interrupt,
 697                                      SA_SHIRQ, su_typev[up->su_type], up);
 698         }
 699         if (retval) {
 700                 printk("su: Cannot register IRQ %d\n", up->port.irq);
 701                 return retval;
 702         }
 703
 704         /*
 705          * Now, initialize the UART
 706          */
 707         serial_outp(up, UART_LCR, UART_LCR_WLEN8);
 708
 709         spin_lock_irqsave(&up->port.lock, flags);
 710
 711         up->port.mctrl |= TIOCM_OUT2;
 712
 713         sunsu_set_mctrl(&up->port, up->port.mctrl);
 714         spin_unlock_irqrestore(&up->port.lock, flags);
 715
 716         /*
 717          * Finally, enable interrupts.  Note: Modem status interrupts
 718          * are set via set_termios(), which will be occurring imminently
 719          * anyway, so we don't enable them here.
 720          */
 721         up->ier = UART_IER_RLSI | UART_IER_RDI;
 722         serial_outp(up, UART_IER, up->ier);
 723
 724         if (up->port.flags & ASYNC_FOURPORT) {
 725                 unsigned int icp;
 726                 /*
 727                  * Enable interrupts on the AST Fourport board
 728                  */
 729                 icp = (up->port.iobase & 0xfe0) | 0x01f;
 730                 outb_p(0x80, icp);
 731                 (void) inb_p(icp);
 732         }
 733
 734         /*
 735          * And clear the interrupt registers again for luck.
 736          */
 737         (void) serial_inp(up, UART_LSR);
 738         (void) serial_inp(up, UART_RX);
 739         (void) serial_inp(up, UART_IIR);
 740         (void) serial_inp(up, UART_MSR);
 741
 742         return 0;
 743 }
 744
 745 static void sunsu_shutdown(struct uart_port *port)
 746 {
 747         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 748         unsigned long flags;
 749
 750         /*
 751          * Disable interrupts from this port
 752          */
 753         up->ier = 0;
 754         serial_outp(up, UART_IER, 0);
 755
 756         spin_lock_irqsave(&up->port.lock, flags);
 757         if (up->port.flags & ASYNC_FOURPORT) {
 758                 /* reset interrupts on the AST Fourport board */
 759                 inb((up->port.iobase & 0xfe0) | 0x1f);
 760                 up->port.mctrl |= TIOCM_OUT1;
 761         } else
 762                 up->port.mctrl &= ~TIOCM_OUT2;
 763
 764         sunsu_set_mctrl(&up->port, up->port.mctrl);
 765         spin_unlock_irqrestore(&up->port.lock, flags);
 766
 767         /*
 768          * Disable break condition and FIFOs
 769          */
 770         serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
 771         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 772                                   UART_FCR_CLEAR_RCVR |
 773                                   UART_FCR_CLEAR_XMIT);
 774         serial_outp(up, UART_FCR, 0);
 775
 776 #ifdef CONFIG_SERIAL_8250_RSA
 777         /*
 778          * Reset the RSA board back to 115kbps compat mode.
 779          */
 780         disable_rsa(up);
 781 #endif
 782
 783         /*
 784          * Read data port to reset things.
 785          */
 786         (void) serial_in(up, UART_RX);
 787
 788         free_irq(up->port.irq, up);
 789 }
 790
 791 static void
 792 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
 793                    unsigned int iflag, unsigned int quot)
 794 {
 795         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 796         unsigned char cval, fcr = 0;
 797         unsigned long flags;
 798
 799         switch (cflag & CSIZE) {
 800         case CS5:
 801                 cval = 0x00;
 802                 break;
 803         case CS6:
 804                 cval = 0x01;
 805                 break;
 806         case CS7:
 807                 cval = 0x02;
 808                 break;
 809         default:
 810         case CS8:
 811                 cval = 0x03;
 812                 break;
 813         }
 814
 815         if (cflag & CSTOPB)
 816                 cval |= 0x04;
 817         if (cflag & PARENB)
 818                 cval |= UART_LCR_PARITY;
 819         if (!(cflag & PARODD))
 820                 cval |= UART_LCR_EPAR;
 821 #ifdef CMSPAR
 822         if (cflag & CMSPAR)
 823                 cval |= UART_LCR_SPAR;
 824 #endif
 825
 826         /*
 827          * Work around a bug in the Oxford Semiconductor 952 rev B
 828          * chip which causes it to seriously miscalculate baud rates
 829          * when DLL is 0.
 830          */
 831         if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
 832             up->rev == 0x5201)
 833                 quot ++;
 834
 835         if (uart_config[up->port.type].flags & UART_USE_FIFO) {
 836                 if ((up->port.uartclk / quot) < (2400 * 16))
 837                         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
 838 #ifdef CONFIG_SERIAL_8250_RSA
 839                 else if (up->port.type == PORT_RSA)
 840                         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
 841 #endif
 842                 else
 843                         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
 844         }
 845         if (up->port.type == PORT_16750)
 846                 fcr |= UART_FCR7_64BYTE;
 847
 848         /*
 849          * Ok, we're now changing the port state.  Do it with
 850          * interrupts disabled.
 851          */
 852         spin_lock_irqsave(&up->port.lock, flags);
 853
 854         /*
 855          * Update the per-port timeout.
 856          */
 857         uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
 858
 859         up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 860         if (iflag & INPCK)
 861                 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 862         if (iflag & (BRKINT | PARMRK))
 863                 up->port.read_status_mask |= UART_LSR_BI;
 864
 865         /*
 866          * Characteres to ignore
 867          */
 868         up->port.ignore_status_mask = 0;
 869         if (iflag & IGNPAR)
 870                 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 871         if (iflag & IGNBRK) {
 872                 up->port.ignore_status_mask |= UART_LSR_BI;
 873                 /*
 874                  * If we're ignoring parity and break indicators,
 875                  * ignore overruns too (for real raw support).
 876                  */
 877                 if (iflag & IGNPAR)
 878                         up->port.ignore_status_mask |= UART_LSR_OE;
 879         }
 880
 881         /*
 882          * ignore all characters if CREAD is not set
 883          */
 884         if ((cflag & CREAD) == 0)
 885                 up->port.ignore_status_mask |= UART_LSR_DR;
 886
 887         /*
 888          * CTS flow control flag and modem status interrupts
 889          */
 890         up->ier &= ~UART_IER_MSI;
 891         if (UART_ENABLE_MS(&up->port, cflag))
 892                 up->ier |= UART_IER_MSI;
 893
 894         serial_out(up, UART_IER, up->ier);
 895
 896         if (uart_config[up->port.type].flags & UART_STARTECH) {
 897                 serial_outp(up, UART_LCR, 0xBF);
 898                 serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
 899         }
 900         serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
 901         serial_outp(up, UART_DLL, quot & 0xff);         /* LS of divisor */
 902         serial_outp(up, UART_DLM, quot >> 8);           /* MS of divisor */
 903         if (up->port.type == PORT_16750)
 904                 serial_outp(up, UART_FCR, fcr);         /* set fcr */
 905         serial_outp(up, UART_LCR, cval);                /* reset DLAB */
 906         up->lcr = cval;                                 /* Save LCR */
 907         if (up->port.type != PORT_16750) {
 908                 if (fcr & UART_FCR_ENABLE_FIFO) {
 909                         /* emulated UARTs (Lucent Venus 167x) need two steps */
 910                         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 911                 }
 912                 serial_outp(up, UART_FCR, fcr);         /* set fcr */
 913         }
 914
 915         up->cflag = cflag;
 916
 917         spin_unlock_irqrestore(&up->port.lock, flags);
 918 }
 919
 920 static void
 921 sunsu_set_termios(struct uart_port *port, struct termios *termios,
 922                   struct termios *old)
 923 {
 924         unsigned int baud, quot;
 925
 926         /*
 927          * Ask the core to calculate the divisor for us.
 928          */
 929         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 930         quot = uart_get_divisor(port, baud);
 931
 932         sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
 933 }
 934
 935 static void sunsu_release_port(struct uart_port *port)
 936 {
 937 }
 938
 939 static int sunsu_request_port(struct uart_port *port)
 940 {
 941         return 0;
 942 }
 943
 944 static void sunsu_config_port(struct uart_port *port, int flags)
 945 {
 946         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 947
 948         if (flags & UART_CONFIG_TYPE) {
 949                 /*
 950                  * We are supposed to call autoconfig here, but this requires
 951                  * splitting all the OBP probing crap from the UART probing.
 952                  * We'll do it when we kill sunsu.c altogether.
 953                  */
 954                 port->type = up->type_probed;   /* XXX */
 955         }
 956 }
 957
 958 static int
 959 sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
 960 {
 961         return -EINVAL;
 962 }
 963
 964 static const char *
 965 sunsu_type(struct uart_port *port)
 966 {
 967         int type = port->type;
 968
 969         if (type >= ARRAY_SIZE(uart_config))
 970                 type = 0;
 971         return uart_config[type].name;
 972 }
 973
 974 static struct uart_ops sunsu_pops = {
 975         .tx_empty       = sunsu_tx_empty,
 976         .set_mctrl      = sunsu_set_mctrl,
 977         .get_mctrl      = sunsu_get_mctrl,
 978         .stop_tx        = sunsu_stop_tx,
 979         .start_tx       = sunsu_start_tx,
 980         .stop_rx        = sunsu_stop_rx,
 981         .enable_ms      = sunsu_enable_ms,
 982         .break_ctl      = sunsu_break_ctl,
 983         .startup        = sunsu_startup,
 984         .shutdown       = sunsu_shutdown,
 985         .set_termios    = sunsu_set_termios,
 986         .type           = sunsu_type,
 987         .release_port   = sunsu_release_port,
 988         .request_port   = sunsu_request_port,
 989         .config_port    = sunsu_config_port,
 990         .verify_port    = sunsu_verify_port,
 991 };
 992
 993 #define UART_NR 4
 994
 995 static struct uart_sunsu_port sunsu_ports[UART_NR];
 996
 997 #ifdef CONFIG_SERIO
 998
 999 static DEFINE_SPINLOCK(sunsu_serio_lock);
1000
1001 static int sunsu_serio_write(struct serio *serio, unsigned char ch)
1002 {
1003         struct uart_sunsu_port *up = serio->port_data;
1004         unsigned long flags;
1005         int lsr;
1006
1007         spin_lock_irqsave(&sunsu_serio_lock, flags);
1008
1009         do {
1010                 lsr = serial_in(up, UART_LSR);
1011         } while (!(lsr & UART_LSR_THRE));
1012
1013         /* Send the character out. */
1014         serial_out(up, UART_TX, ch);
1015
1016         spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1017
1018         return 0;
1019 }
1020
1021 static int sunsu_serio_open(struct serio *serio)
1022 {
1023         struct uart_sunsu_port *up = serio->port_data;
1024         unsigned long flags;
1025         int ret;
1026
1027         spin_lock_irqsave(&sunsu_serio_lock, flags);
1028         if (!up->serio_open) {
1029                 up->serio_open = 1;
1030                 ret = 0;
1031         } else
1032                 ret = -EBUSY;
1033         spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1034
1035         return ret;
1036 }
1037
1038 static void sunsu_serio_close(struct serio *serio)
1039 {
1040         struct uart_sunsu_port *up = serio->port_data;
1041         unsigned long flags;
1042
1043         spin_lock_irqsave(&sunsu_serio_lock, flags);
1044         up->serio_open = 0;
1045         spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1046 }
1047
1048 #endif /* CONFIG_SERIO */
1049
1050 static void sunsu_autoconfig(struct uart_sunsu_port *up)
1051 {
1052         unsigned char status1, status2, scratch, scratch2, scratch3;
1053         unsigned char save_lcr, save_mcr;
1054         struct linux_ebus_device *dev = NULL;
1055         struct linux_ebus *ebus;
1056 #ifdef CONFIG_SPARC64
1057         struct sparc_isa_bridge *isa_br;
1058         struct sparc_isa_device *isa_dev;
1059 #endif
1060 #ifndef CONFIG_SPARC64
1061         struct linux_prom_registers reg0;
1062 #endif
1063         unsigned long flags;
1064
1065         if (!up->port_node || !up->su_type)
1066                 return;
1067
1068         up->type_probed = PORT_UNKNOWN;
1069         up->port.iotype = SERIAL_IO_MEM;
1070
1071         /*
1072          * First we look for Ebus-bases su's
1073          */
1074         for_each_ebus(ebus) {
1075                 for_each_ebusdev(dev, ebus) {
1076                         if (dev->prom_node == up->port_node) {
1077                                 /*
1078                                  * The EBus is broken on sparc; it delivers
1079                                  * virtual addresses in resources. Oh well...
1080                                  * This is correct on sparc64, though.
1081                                  */
1082                                 up->port.membase = (char *) dev->resource[0].start;
1083                                 /*
1084                                  * This is correct on both architectures.
1085                                  */
1086                                 up->port.mapbase = dev->resource[0].start;
1087                                 up->port.irq = dev->irqs[0];
1088                                 goto ebus_done;
1089                         }
1090                 }
1091         }
1092
1093 #ifdef CONFIG_SPARC64
1094         for_each_isa(isa_br) {
1095                 for_each_isadev(isa_dev, isa_br) {
1096                         if (isa_dev->prom_node == up->port_node) {
1097                                 /* Same on sparc64. Cool architecure... */
1098                                 up->port.membase = (char *) isa_dev->resource.start;
1099                                 up->port.mapbase = isa_dev->resource.start;
1100                                 up->port.irq = isa_dev->irq;
1101                                 goto ebus_done;
1102                         }
1103                 }
1104         }
1105 #endif
1106
1107 #ifdef CONFIG_SPARC64
1108         /*
1109          * Not on Ebus, bailing.
1110          */
1111         return;
1112 #else
1113         /*
1114          * Not on Ebus, must be OBIO.
1115          */
1116         if (prom_getproperty(up->port_node, "reg",
1117                              (char *)&reg0, sizeof(reg0)) == -1) {
1118                 prom_printf("sunsu: no \"reg\" property\n");
1119                 return;
1120         }
1121         prom_apply_obio_ranges(&reg0, 1);
1122         if (reg0.which_io != 0) {       /* Just in case... */
1123                 prom_printf("sunsu: bus number nonzero: 0x%x:%x\n",
1124                     reg0.which_io, reg0.phys_addr);
1125                 return;
1126         }
1127         up->port.mapbase = reg0.phys_addr;
1128         if ((up->port.membase = ioremap(reg0.phys_addr, reg0.reg_size)) == 0) {
1129                 prom_printf("sunsu: Cannot map registers.\n");
1130                 return;
1131         }
1132
1133         /*
1134          * 0x20 is sun4m thing, Dave Redman heritage.
1135          * See arch/sparc/kernel/irq.c.
1136          */
1137 #define IRQ_4M(n)       ((n)|0x20)
1138
1139         /*
1140          * There is no intr property on MrCoffee, so hardwire it.
1141          */
1142         up->port.irq = IRQ_4M(13);
1143 #endif
1144
1145 ebus_done:
1146
1147         spin_lock_irqsave(&up->port.lock, flags);
1148
1149         if (!(up->port.flags & ASYNC_BUGGY_UART)) {
1150                 /*
1151                  * Do a simple existence test first; if we fail this, there's
1152                  * no point trying anything else.
1153                  *
1154                  * 0x80 is used as a nonsense port to prevent against false
1155                  * positives due to ISA bus float.  The assumption is that
1156                  * 0x80 is a non-existent port; which should be safe since
1157                  * include/asm/io.h also makes this assumption.
1158                  */
1159                 scratch = serial_inp(up, UART_IER);
1160                 serial_outp(up, UART_IER, 0);
1161 #ifdef __i386__
1162                 outb(0xff, 0x080);
1163 #endif
1164                 scratch2 = serial_inp(up, UART_IER);
1165                 serial_outp(up, UART_IER, 0x0f);
1166 #ifdef __i386__
1167                 outb(0, 0x080);
1168 #endif
1169                 scratch3 = serial_inp(up, UART_IER);
1170                 serial_outp(up, UART_IER, scratch);
1171                 if (scratch2 != 0 || scratch3 != 0x0F)
1172                         goto out;       /* We failed; there's nothing here */
1173         }
1174
1175         save_mcr = serial_in(up, UART_MCR);
1176         save_lcr = serial_in(up, UART_LCR);
1177
1178         /*
1179          * Check to see if a UART is really there.  Certain broken
1180          * internal modems based on the Rockwell chipset fail this
1181          * test, because they apparently don't implement the loopback
1182          * test mode.  So this test is skipped on the COM 1 through
1183          * COM 4 ports.  This *should* be safe, since no board
1184          * manufacturer would be stupid enough to design a board
1185          * that conflicts with COM 1-4 --- we hope!
1186          */
1187         if (!(up->port.flags & ASYNC_SKIP_TEST)) {
1188                 serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
1189                 status1 = serial_inp(up, UART_MSR) & 0xF0;
1190                 serial_outp(up, UART_MCR, save_mcr);
1191                 if (status1 != 0x90)
1192                         goto out;       /* We failed loopback test */
1193         }
1194         serial_outp(up, UART_LCR, 0xBF);        /* set up for StarTech test */
1195         serial_outp(up, UART_EFR, 0);           /* EFR is the same as FCR */
1196         serial_outp(up, UART_LCR, 0);
1197         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1198         scratch = serial_in(up, UART_IIR) >> 6;
1199         switch (scratch) {
1200                 case 0:
1201                         up->port.type = PORT_16450;
1202                         break;
1203                 case 1:
1204                         up->port.type = PORT_UNKNOWN;
1205                         break;
1206                 case 2:
1207                         up->port.type = PORT_16550;
1208                         break;
1209                 case 3:
1210                         up->port.type = PORT_16550A;
1211                         break;
1212         }
1213         if (up->port.type == PORT_16550A) {
1214                 /* Check for Startech UART's */
1215                 serial_outp(up, UART_LCR, UART_LCR_DLAB);
1216                 if (serial_in(up, UART_EFR) == 0) {
1217                         up->port.type = PORT_16650;
1218                 } else {
1219                         serial_outp(up, UART_LCR, 0xBF);
1220                         if (serial_in(up, UART_EFR) == 0)
1221                                 up->port.type = PORT_16650V2;
1222                 }
1223         }
1224         if (up->port.type == PORT_16550A) {
1225                 /* Check for TI 16750 */
1226                 serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
1227                 serial_outp(up, UART_FCR,
1228                             UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1229                 scratch = serial_in(up, UART_IIR) >> 5;
1230                 if (scratch == 7) {
1231                         /*
1232                          * If this is a 16750, and not a cheap UART
1233                          * clone, then it should only go into 64 byte
1234                          * mode if the UART_FCR7_64BYTE bit was set
1235                          * while UART_LCR_DLAB was latched.
1236                          */
1237                         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1238                         serial_outp(up, UART_LCR, 0);
1239                         serial_outp(up, UART_FCR,
1240                                     UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1241                         scratch = serial_in(up, UART_IIR) >> 5;
1242                         if (scratch == 6)
1243                                 up->port.type = PORT_16750;
1244                 }
1245                 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1246         }
1247         serial_outp(up, UART_LCR, save_lcr);
1248         if (up->port.type == PORT_16450) {
1249                 scratch = serial_in(up, UART_SCR);
1250                 serial_outp(up, UART_SCR, 0xa5);
1251                 status1 = serial_in(up, UART_SCR);
1252                 serial_outp(up, UART_SCR, 0x5a);
1253                 status2 = serial_in(up, UART_SCR);
1254                 serial_outp(up, UART_SCR, scratch);
1255
1256                 if ((status1 != 0xa5) || (status2 != 0x5a))
1257                         up->port.type = PORT_8250;
1258         }
1259
1260         up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
1261
1262         if (up->port.type == PORT_UNKNOWN)
1263                 goto out;
1264         up->type_probed = up->port.type;        /* XXX */
1265
1266         /*
1267          * Reset the UART.
1268          */
1269 #ifdef CONFIG_SERIAL_8250_RSA
1270         if (up->port.type == PORT_RSA)
1271                 serial_outp(up, UART_RSA_FRR, 0);
1272 #endif
1273         serial_outp(up, UART_MCR, save_mcr);
1274         serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
1275                                      UART_FCR_CLEAR_RCVR |
1276                                      UART_FCR_CLEAR_XMIT));
1277         serial_outp(up, UART_FCR, 0);
1278         (void)serial_in(up, UART_RX);
1279         serial_outp(up, UART_IER, 0);
1280
1281 out:
1282         spin_unlock_irqrestore(&up->port.lock, flags);
1283 }
1284
1285 static struct uart_driver sunsu_reg = {
1286         .owner                  = THIS_MODULE,
1287         .driver_name            = "serial",
1288         .devfs_name             = "tts/",
1289         .dev_name               = "ttyS",
1290         .major                  = TTY_MAJOR,
1291 };
1292
1293 static int __init sunsu_kbd_ms_init(struct uart_sunsu_port *up, int channel)
1294 {
1295         int quot, baud;
1296 #ifdef CONFIG_SERIO
1297         struct serio *serio;
1298 #endif
1299
1300         up->port.line = channel;
1301         up->port.type = PORT_UNKNOWN;
1302         up->port.uartclk = (SU_BASE_BAUD * 16);
1303
1304         if (up->su_type == SU_PORT_KBD) {
1305                 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1306                 baud = 1200;
1307         } else {
1308                 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1309                 baud = 4800;
1310         }
1311         quot = up->port.uartclk / (16 * baud);
1312
1313         sunsu_autoconfig(up);
1314         if (up->port.type == PORT_UNKNOWN)
1315                 return -1;
1316
1317         printk(KERN_INFO "su%d at 0x%p (irq = %s) is a %s\n",
1318                channel,
1319                up->port.membase, __irq_itoa(up->port.irq),
1320                sunsu_type(&up->port));
1321
1322 #ifdef CONFIG_SERIO
1323         up->serio = serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
1324         if (serio) {
1325                 memset(serio, 0, sizeof(*serio));
1326
1327                 serio->port_data = up;
1328
1329                 serio->id.type = SERIO_RS232;
1330                 if (up->su_type == SU_PORT_KBD) {
1331                         serio->id.proto = SERIO_SUNKBD;
1332                         strlcpy(serio->name, "sukbd", sizeof(serio->name));
1333                 } else {
1334                         serio->id.proto = SERIO_SUN;
1335                         serio->id.extra = 1;
1336                         strlcpy(serio->name, "sums", sizeof(serio->name));
1337                 }
1338                 strlcpy(serio->phys, (channel == 0 ? "su/serio0" : "su/serio1"),
1339                         sizeof(serio->phys));
1340
1341                 serio->write = sunsu_serio_write;
1342                 serio->open = sunsu_serio_open;
1343                 serio->close = sunsu_serio_close;
1344
1345                 serio_register_port(serio);
1346         } else {
1347                 printk(KERN_WARNING "su%d: not enough memory for serio port\n",
1348                         channel);
1349         }
1350 #endif
1351
1352         sunsu_change_speed(&up->port, up->cflag, 0, quot);
1353
1354         sunsu_startup(&up->port);
1355         return 0;
1356 }
1357
1358 /*
1359  * ------------------------------------------------------------
1360  * Serial console driver
1361  * ------------------------------------------------------------
1362  */
1363
1364 #ifdef CONFIG_SERIAL_SUNSU_CONSOLE
1365
1366 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1367
1368 /*
1369  *      Wait for transmitter & holding register to empty
1370  */
1371 static __inline__ void wait_for_xmitr(struct uart_sunsu_port *up)
1372 {
1373         unsigned int status, tmout = 10000;
1374
1375         /* Wait up to 10ms for the character(s) to be sent. */
1376         do {
1377                 status = serial_in(up, UART_LSR);
1378
1379                 if (status & UART_LSR_BI)
1380                         up->lsr_break_flag = UART_LSR_BI;
1381
1382                 if (--tmout == 0)
1383                         break;
1384                 udelay(1);
1385         } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1386
1387         /* Wait up to 1s for flow control if necessary */
1388         if (up->port.flags & ASYNC_CONS_FLOW) {
1389                 tmout = 1000000;
1390                 while (--tmout &&
1391                        ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
1392                         udelay(1);
1393         }
1394 }
1395
1396 /*
1397  *      Print a string to the serial port trying not to disturb
1398  *      any possible real use of the port...
1399  */
1400 static void sunsu_console_write(struct console *co, const char *s,
1401                                 unsigned int count)
1402 {
1403         struct uart_sunsu_port *up = &sunsu_ports[co->index];
1404         unsigned int ier;
1405         int i;
1406
1407         /*
1408          *      First save the UER then disable the interrupts
1409          */
1410         ier = serial_in(up, UART_IER);
1411         serial_out(up, UART_IER, 0);
1412
1413         /*
1414          *      Now, do each character
1415          */
1416         for (i = 0; i < count; i++, s++) {
1417                 wait_for_xmitr(up);
1418
1419                 /*
1420                  *      Send the character out.
1421                  *      If a LF, also do CR...
1422                  */
1423                 serial_out(up, UART_TX, *s);
1424                 if (*s == 10) {
1425                         wait_for_xmitr(up);
1426                         serial_out(up, UART_TX, 13);
1427                 }
1428         }
1429
1430         /*
1431          *      Finally, wait for transmitter to become empty
1432          *      and restore the IER
1433          */
1434         wait_for_xmitr(up);
1435         serial_out(up, UART_IER, ier);
1436 }
1437
1438 /*
1439  *      Setup initial baud/bits/parity. We do two things here:
1440  *      - construct a cflag setting for the first su_open()
1441  *      - initialize the serial port
1442  *      Return non-zero if we didn't find a serial port.
1443  */
1444 static int __init sunsu_console_setup(struct console *co, char *options)
1445 {
1446         struct uart_port *port;
1447         int baud = 9600;
1448         int bits = 8;
1449         int parity = 'n';
1450         int flow = 'n';
1451
1452         printk("Console: ttyS%d (SU)\n",
1453                (sunsu_reg.minor - 64) + co->index);
1454
1455         /*
1456          * Check whether an invalid uart number has been specified, and
1457          * if so, search for the first available port that does have
1458          * console support.
1459          */
1460         if (co->index >= UART_NR)
1461                 co->index = 0;
1462         port = &sunsu_ports[co->index].port;
1463
1464         /*
1465          * Temporary fix.
1466          */
1467         spin_lock_init(&port->lock);
1468
1469         if (options)
1470                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1471
1472         return uart_set_options(port, co, baud, parity, bits, flow);
1473 }
1474
1475 static struct console sunsu_cons = {
1476         .name   =       "ttyS",
1477         .write  =       sunsu_console_write,
1478         .device =       uart_console_device,
1479         .setup  =       sunsu_console_setup,
1480         .flags  =       CON_PRINTBUFFER,
1481         .index  =       -1,
1482         .data   =       &sunsu_reg,
1483 };
1484 #define SUNSU_CONSOLE   (&sunsu_cons)
1485
1486 /*
1487  *      Register console.
1488  */
1489
1490 static int __init sunsu_serial_console_init(void)
1491 {
1492         int i;
1493
1494         if (con_is_present())
1495                 return 0;
1496
1497         for (i = 0; i < UART_NR; i++) {
1498                 int this_minor = sunsu_reg.minor + i;
1499
1500                 if ((this_minor - 64) == (serial_console - 1))
1501                         break;
1502         }
1503         if (i == UART_NR)
1504                 return 0;
1505         if (sunsu_ports[i].port_node == 0)
1506                 return 0;
1507
1508         sunsu_cons.index = i;
1509         register_console(&sunsu_cons);
1510         return 0;
1511 }
1512 #else
1513 #define SUNSU_CONSOLE                   (NULL)
1514 #define sunsu_serial_console_init()     do { } while (0)
1515 #endif
1516
1517 static int __init sunsu_serial_init(void)
1518 {
1519         int instance, ret, i;
1520
1521         /* How many instances do we need?  */
1522         instance = 0;
1523         for (i = 0; i < UART_NR; i++) {
1524                 struct uart_sunsu_port *up = &sunsu_ports[i];
1525
1526                 if (up->su_type == SU_PORT_MS ||
1527                     up->su_type == SU_PORT_KBD)
1528                         continue;
1529
1530                 up->port.flags |= ASYNC_BOOT_AUTOCONF;
1531                 up->port.type = PORT_UNKNOWN;
1532                 up->port.uartclk = (SU_BASE_BAUD * 16);
1533
1534                 sunsu_autoconfig(up);
1535                 if (up->port.type == PORT_UNKNOWN)
1536                         continue;
1537
1538                 up->port.line = instance++;
1539                 up->port.ops = &sunsu_pops;
1540         }
1541
1542         sunsu_reg.minor = sunserial_current_minor;
1543         sunserial_current_minor += instance;
1544
1545         sunsu_reg.nr = instance;
1546         sunsu_reg.cons = SUNSU_CONSOLE;
1547
1548         ret = uart_register_driver(&sunsu_reg);
1549         if (ret < 0)
1550                 return ret;
1551
1552         sunsu_serial_console_init();
1553         for (i = 0; i < UART_NR; i++) {
1554                 struct uart_sunsu_port *up = &sunsu_ports[i];
1555
1556                 /* Do not register Keyboard/Mouse lines with UART
1557                  * layer.
1558                  */
1559                 if (up->su_type == SU_PORT_MS ||
1560                     up->su_type == SU_PORT_KBD)
1561                         continue;
1562
1563                 if (up->port.type == PORT_UNKNOWN)
1564                         continue;
1565
1566                 uart_add_one_port(&sunsu_reg, &up->port);
1567         }
1568
1569         return 0;
1570 }
1571
1572 static int su_node_ok(int node, char *name, int namelen)
1573 {
1574         if (strncmp(name, "su", namelen) == 0 ||
1575             strncmp(name, "su_pnp", namelen) == 0)
1576                 return 1;
1577
1578         if (strncmp(name, "serial", namelen) == 0) {
1579                 char compat[32];
1580                 int clen;
1581
1582                 /* Is it _really_ a 'su' device? */
1583                 clen = prom_getproperty(node, "compatible", compat, sizeof(compat));
1584                 if (clen > 0) {
1585                         if (strncmp(compat, "sab82532", 8) == 0) {
1586                                 /* Nope, Siemens serial, not for us. */
1587                                 return 0;
1588                         }
1589                 }
1590                 return 1;
1591         }
1592
1593         return 0;
1594 }
1595
1596 #define SU_PROPSIZE     128
1597
1598 /*
1599  * Scan status structure.
1600  * "prop" is a local variable but it eats stack to keep it in each
1601  * stack frame of a recursive procedure.
1602  */
1603 struct su_probe_scan {
1604         int msnode, kbnode;     /* PROM nodes for mouse and keyboard */
1605         int msx, kbx;           /* minors for mouse and keyboard */
1606         int devices;            /* scan index */
1607         char prop[SU_PROPSIZE];
1608 };
1609
1610 /*
1611  * We have several platforms which present 'su' in different parts
1612  * of the device tree. 'su' may be found under obio, ebus, isa and pci.
1613  * We walk over the tree and find them wherever PROM hides them.
1614  */
1615 static void __init su_probe_any(struct su_probe_scan *t, int sunode)
1616 {
1617         struct uart_sunsu_port *up;
1618         int len;
1619
1620         if (t->devices >= UART_NR)
1621                 return;
1622
1623         for (; sunode != 0; sunode = prom_getsibling(sunode)) {
1624                 len = prom_getproperty(sunode, "name", t->prop, SU_PROPSIZE);
1625                 if (len <= 1)
1626                         continue;               /* Broken PROM node */
1627
1628                 if (su_node_ok(sunode, t->prop, len)) {
1629                         up = &sunsu_ports[t->devices];
1630                         if (t->kbnode != 0 && sunode == t->kbnode) {
1631                                 t->kbx = t->devices;
1632                                 up->su_type = SU_PORT_KBD;
1633                         } else if (t->msnode != 0 && sunode == t->msnode) {
1634                                 t->msx = t->devices;
1635                                 up->su_type = SU_PORT_MS;
1636                         } else {
1637 #ifdef CONFIG_SPARC64
1638                                 /*
1639                                  * Do not attempt to use the truncated
1640                                  * keyboard/mouse ports as serial ports
1641                                  * on Ultras with PC keyboard attached.
1642                                  */
1643                                 if (prom_getbool(sunode, "mouse"))
1644                                         continue;
1645                                 if (prom_getbool(sunode, "keyboard"))
1646                                         continue;
1647 #endif
1648                                 up->su_type = SU_PORT_PORT;
1649                         }
1650                         up->port_node = sunode;
1651                         ++t->devices;
1652                 } else {
1653                         su_probe_any(t, prom_getchild(sunode));
1654                 }
1655         }
1656 }
1657
1658 static int __init sunsu_probe(void)
1659 {
1660         int node;
1661         int len;
1662         struct su_probe_scan scan;
1663
1664         /*
1665          * First, we scan the tree.
1666          */
1667         scan.devices = 0;
1668         scan.msx = -1;
1669         scan.kbx = -1;
1670         scan.kbnode = 0;
1671         scan.msnode = 0;
1672
1673         /*
1674          * Get the nodes for keyboard and mouse from 'aliases'...
1675          */
1676         node = prom_getchild(prom_root_node);
1677         node = prom_searchsiblings(node, "aliases");
1678         if (node != 0) {
1679                 len = prom_getproperty(node, "keyboard", scan.prop, SU_PROPSIZE);
1680                 if (len > 0) {
1681                         scan.prop[len] = 0;
1682                         scan.kbnode = prom_finddevice(scan.prop);
1683                 }
1684
1685                 len = prom_getproperty(node, "mouse", scan.prop, SU_PROPSIZE);
1686                 if (len > 0) {
1687                         scan.prop[len] = 0;
1688                         scan.msnode = prom_finddevice(scan.prop);
1689                 }
1690         }
1691
1692         su_probe_any(&scan, prom_getchild(prom_root_node));
1693
1694         /*
1695          * Second, we process the special case of keyboard and mouse.
1696          *
1697          * Currently if we got keyboard and mouse hooked to "su" ports
1698          * we do not use any possible remaining "su" as a serial port.
1699          * Thus, we ignore values of .msx and .kbx, then compact ports.
1700          */
1701         if (scan.msx != -1 && scan.kbx != -1) {
1702                 sunsu_ports[0].su_type = SU_PORT_MS;
1703                 sunsu_ports[0].port_node = scan.msnode;
1704                 sunsu_kbd_ms_init(&sunsu_ports[0], 0);
1705
1706                 sunsu_ports[1].su_type = SU_PORT_KBD;
1707                 sunsu_ports[1].port_node = scan.kbnode;
1708                 sunsu_kbd_ms_init(&sunsu_ports[1], 1);
1709
1710                 return 0;
1711         }
1712
1713         if (scan.msx != -1 || scan.kbx != -1) {
1714                 printk("sunsu_probe: cannot match keyboard and mouse, confused\n");
1715                 return -ENODEV;
1716         }
1717
1718         if (scan.devices == 0)
1719                 return -ENODEV;
1720
1721         /*
1722          * Console must be initiated after the generic initialization.
1723          */
1724         sunsu_serial_init();
1725
1726         return 0;
1727 }
1728
1729 static void __exit sunsu_exit(void)
1730 {
1731         int i, saw_uart;
1732
1733         saw_uart = 0;
1734         for (i = 0; i < UART_NR; i++) {
1735                 struct uart_sunsu_port *up = &sunsu_ports[i];
1736
1737                 if (up->su_type == SU_PORT_MS ||
1738                     up->su_type == SU_PORT_KBD) {
1739 #ifdef CONFIG_SERIO
1740                         if (up->serio) {
1741                                 serio_unregister_port(up->serio);
1742                                 up->serio = NULL;
1743                         }
1744 #endif
1745                 } else if (up->port.type != PORT_UNKNOWN) {
1746                         uart_remove_one_port(&sunsu_reg, &up->port);
1747                         saw_uart++;
1748                 }
1749         }
1750
1751         if (saw_uart)
1752                 uart_unregister_driver(&sunsu_reg);
1753 }
1754
1755 module_init(sunsu_probe);
1756 module_exit(sunsu_exit);