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         /*
 273          * We really want to stop the transmitter from sending.
 274          */
 275         if (up->port.type == PORT_16C950) {
 276                 up->acr |= UART_ACR_TXDIS;
 277                 serial_icr_write(up, UART_ACR, up->acr);
 278         }
 279 }
 280
 281 static void sunsu_start_tx(struct uart_port *port)
 282 {
 283         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 284
 285         if (!(up->ier & UART_IER_THRI)) {
 286                 up->ier |= UART_IER_THRI;
 287                 serial_out(up, UART_IER, up->ier);
 288         }
 289
 290         /*
 291          * Re-enable the transmitter if we disabled it.
 292          */
 293         if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
 294                 up->acr &= ~UART_ACR_TXDIS;
 295                 serial_icr_write(up, UART_ACR, up->acr);
 296         }
 297 }
 298
 299 static void sunsu_stop_rx(struct uart_port *port)
 300 {
 301         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 302         unsigned long flags;
 303
 304         spin_lock_irqsave(&up->port.lock, flags);
 305         up->ier &= ~UART_IER_RLSI;
 306         up->port.read_status_mask &= ~UART_LSR_DR;
 307         serial_out(up, UART_IER, up->ier);
 308         spin_unlock_irqrestore(&up->port.lock, flags);
 309 }
 310
 311 static void sunsu_enable_ms(struct uart_port *port)
 312 {
 313         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 314         unsigned long flags;
 315
 316         spin_lock_irqsave(&up->port.lock, flags);
 317         up->ier |= UART_IER_MSI;
 318         serial_out(up, UART_IER, up->ier);
 319         spin_unlock_irqrestore(&up->port.lock, flags);
 320 }
 321
 322 static _INLINE_ struct tty_struct *
 323 receive_chars(struct uart_sunsu_port *up, unsigned char *status, struct pt_regs *regs)
 324 {
 325         struct tty_struct *tty = up->port.info->tty;
 326         unsigned char ch;
 327         int max_count = 256;
 328         int saw_console_brk = 0;
 329
 330         do {
 331                 if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
 332                         tty->flip.work.func((void *)tty);
 333                         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
 334                                 return tty; // if TTY_DONT_FLIP is set
 335                 }
 336                 ch = serial_inp(up, UART_RX);
 337                 *tty->flip.char_buf_ptr = ch;
 338                 *tty->flip.flag_buf_ptr = TTY_NORMAL;
 339                 up->port.icount.rx++;
 340
 341                 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
 342                                        UART_LSR_FE | UART_LSR_OE))) {
 343                         /*
 344                          * For statistics only
 345                          */
 346                         if (*status & UART_LSR_BI) {
 347                                 *status &= ~(UART_LSR_FE | UART_LSR_PE);
 348                                 up->port.icount.brk++;
 349                                 if (up->port.cons != NULL &&
 350                                     up->port.line == up->port.cons->index)
 351                                         saw_console_brk = 1;
 352                                 /*
 353                                  * We do the SysRQ and SAK checking
 354                                  * here because otherwise the break
 355                                  * may get masked by ignore_status_mask
 356                                  * or read_status_mask.
 357                                  */
 358                                 if (uart_handle_break(&up->port))
 359                                         goto ignore_char;
 360                         } else if (*status & UART_LSR_PE)
 361                                 up->port.icount.parity++;
 362                         else if (*status & UART_LSR_FE)
 363                                 up->port.icount.frame++;
 364                         if (*status & UART_LSR_OE)
 365                                 up->port.icount.overrun++;
 366
 367                         /*
 368                          * Mask off conditions which should be ingored.
 369                          */
 370                         *status &= up->port.read_status_mask;
 371
 372                         if (up->port.cons != NULL &&
 373                             up->port.line == up->port.cons->index) {
 374                                 /* Recover the break flag from console xmit */
 375                                 *status |= up->lsr_break_flag;
 376                                 up->lsr_break_flag = 0;
 377                         }
 378
 379                         if (*status & UART_LSR_BI) {
 380                                 *tty->flip.flag_buf_ptr = TTY_BREAK;
 381                         } else if (*status & UART_LSR_PE)
 382                                 *tty->flip.flag_buf_ptr = TTY_PARITY;
 383                         else if (*status & UART_LSR_FE)
 384                                 *tty->flip.flag_buf_ptr = TTY_FRAME;
 385                 }
 386                 if (uart_handle_sysrq_char(&up->port, ch, regs))
 387                         goto ignore_char;
 388                 if ((*status & up->port.ignore_status_mask) == 0) {
 389                         tty->flip.flag_buf_ptr++;
 390                         tty->flip.char_buf_ptr++;
 391                         tty->flip.count++;
 392                 }
 393                 if ((*status & UART_LSR_OE) &&
 394                     tty->flip.count < TTY_FLIPBUF_SIZE) {
 395                         /*
 396                          * Overrun is special, since it's reported
 397                          * immediately, and doesn't affect the current
 398                          * character.
 399                          */
 400                         *tty->flip.flag_buf_ptr = TTY_OVERRUN;
 401                         tty->flip.flag_buf_ptr++;
 402                         tty->flip.char_buf_ptr++;
 403                         tty->flip.count++;
 404                 }
 405         ignore_char:
 406                 *status = serial_inp(up, UART_LSR);
 407         } while ((*status & UART_LSR_DR) && (max_count-- > 0));
 408
 409         if (saw_console_brk)
 410                 sun_do_break();
 411
 412         return tty;
 413 }
 414
 415 static _INLINE_ void transmit_chars(struct uart_sunsu_port *up)
 416 {
 417         struct circ_buf *xmit = &up->port.info->xmit;
 418         int count;
 419
 420         if (up->port.x_char) {
 421                 serial_outp(up, UART_TX, up->port.x_char);
 422                 up->port.icount.tx++;
 423                 up->port.x_char = 0;
 424                 return;
 425         }
 426         if (uart_tx_stopped(&up->port)) {
 427                 sunsu_stop_tx(&up->port);
 428                 return;
 429         }
 430         if (uart_circ_empty(xmit)) {
 431                 __stop_tx(up);
 432                 return;
 433         }
 434
 435         count = up->port.fifosize;
 436         do {
 437                 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
 438                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 439                 up->port.icount.tx++;
 440                 if (uart_circ_empty(xmit))
 441                         break;
 442         } while (--count > 0);
 443
 444         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 445                 uart_write_wakeup(&up->port);
 446
 447         if (uart_circ_empty(xmit))
 448                 __stop_tx(up);
 449 }
 450
 451 static _INLINE_ void check_modem_status(struct uart_sunsu_port *up)
 452 {
 453         int status;
 454
 455         status = serial_in(up, UART_MSR);
 456
 457         if ((status & UART_MSR_ANY_DELTA) == 0)
 458                 return;
 459
 460         if (status & UART_MSR_TERI)
 461                 up->port.icount.rng++;
 462         if (status & UART_MSR_DDSR)
 463                 up->port.icount.dsr++;
 464         if (status & UART_MSR_DDCD)
 465                 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
 466         if (status & UART_MSR_DCTS)
 467                 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
 468
 469         wake_up_interruptible(&up->port.info->delta_msr_wait);
 470 }
 471
 472 static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 473 {
 474         struct uart_sunsu_port *up = dev_id;
 475         unsigned long flags;
 476         unsigned char status;
 477
 478         spin_lock_irqsave(&up->port.lock, flags);
 479
 480         do {
 481                 struct tty_struct *tty;
 482
 483                 status = serial_inp(up, UART_LSR);
 484                 tty = NULL;
 485                 if (status & UART_LSR_DR)
 486                         tty = receive_chars(up, &status, regs);
 487                 check_modem_status(up);
 488                 if (status & UART_LSR_THRE)
 489                         transmit_chars(up);
 490
 491                 spin_unlock_irqrestore(&up->port.lock, flags);
 492
 493                 if (tty)
 494                         tty_flip_buffer_push(tty);
 495
 496                 spin_lock_irqsave(&up->port.lock, flags);
 497
 498         } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));
 499
 500         spin_unlock_irqrestore(&up->port.lock, flags);
 501
 502         return IRQ_HANDLED;
 503 }
 504
 505 /* Separate interrupt handling path for keyboard/mouse ports.  */
 506
 507 static void
 508 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
 509                    unsigned int iflag, unsigned int quot);
 510
 511 static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
 512 {
 513         unsigned int cur_cflag = up->cflag;
 514         int quot, new_baud;
 515
 516         up->cflag &= ~CBAUD;
 517         up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
 518
 519         quot = up->port.uartclk / (16 * new_baud);
 520
 521         spin_unlock(&up->port.lock);
 522
 523         sunsu_change_speed(&up->port, up->cflag, 0, quot);
 524
 525         spin_lock(&up->port.lock);
 526 }
 527
 528 static void receive_kbd_ms_chars(struct uart_sunsu_port *up, struct pt_regs *regs, int is_break)
 529 {
 530         do {
 531                 unsigned char ch = serial_inp(up, UART_RX);
 532
 533                 /* Stop-A is handled by drivers/char/keyboard.c now. */
 534                 if (up->su_type == SU_PORT_KBD) {
 535 #ifdef CONFIG_SERIO
 536                         serio_interrupt(up->serio, ch, 0, regs);
 537 #endif
 538                 } else if (up->su_type == SU_PORT_MS) {
 539                         int ret = suncore_mouse_baud_detection(ch, is_break);
 540
 541                         switch (ret) {
 542                         case 2:
 543                                 sunsu_change_mouse_baud(up);
 544                                 /* fallthru */
 545                         case 1:
 546                                 break;
 547
 548                         case 0:
 549 #ifdef CONFIG_SERIO
 550                                 serio_interrupt(up->serio, ch, 0, regs);
 551 #endif
 552                                 break;
 553                         };
 554                 }
 555         } while (serial_in(up, UART_LSR) & UART_LSR_DR);
 556 }
 557
 558 static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 559 {
 560         struct uart_sunsu_port *up = dev_id;
 561
 562         if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
 563                 unsigned char status = serial_inp(up, UART_LSR);
 564
 565                 if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
 566                         receive_kbd_ms_chars(up, regs,
 567                                              (status & UART_LSR_BI) != 0);
 568         }
 569
 570         return IRQ_HANDLED;
 571 }
 572
 573 static unsigned int sunsu_tx_empty(struct uart_port *port)
 574 {
 575         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 576         unsigned long flags;
 577         unsigned int ret;
 578
 579         spin_lock_irqsave(&up->port.lock, flags);
 580         ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
 581         spin_unlock_irqrestore(&up->port.lock, flags);
 582
 583         return ret;
 584 }
 585
 586 static unsigned int sunsu_get_mctrl(struct uart_port *port)
 587 {
 588         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 589         unsigned char status;
 590         unsigned int ret;
 591
 592         status = serial_in(up, UART_MSR);
 593
 594         ret = 0;
 595         if (status & UART_MSR_DCD)
 596                 ret |= TIOCM_CAR;
 597         if (status & UART_MSR_RI)
 598                 ret |= TIOCM_RNG;
 599         if (status & UART_MSR_DSR)
 600                 ret |= TIOCM_DSR;
 601         if (status & UART_MSR_CTS)
 602                 ret |= TIOCM_CTS;
 603         return ret;
 604 }
 605
 606 static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
 607 {
 608         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 609         unsigned char mcr = 0;
 610
 611         if (mctrl & TIOCM_RTS)
 612                 mcr |= UART_MCR_RTS;
 613         if (mctrl & TIOCM_DTR)
 614                 mcr |= UART_MCR_DTR;
 615         if (mctrl & TIOCM_OUT1)
 616                 mcr |= UART_MCR_OUT1;
 617         if (mctrl & TIOCM_OUT2)
 618                 mcr |= UART_MCR_OUT2;
 619         if (mctrl & TIOCM_LOOP)
 620                 mcr |= UART_MCR_LOOP;
 621
 622         serial_out(up, UART_MCR, mcr);
 623 }
 624
 625 static void sunsu_break_ctl(struct uart_port *port, int break_state)
 626 {
 627         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 628         unsigned long flags;
 629
 630         spin_lock_irqsave(&up->port.lock, flags);
 631         if (break_state == -1)
 632                 up->lcr |= UART_LCR_SBC;
 633         else
 634                 up->lcr &= ~UART_LCR_SBC;
 635         serial_out(up, UART_LCR, up->lcr);
 636         spin_unlock_irqrestore(&up->port.lock, flags);
 637 }
 638
 639 static int sunsu_startup(struct uart_port *port)
 640 {
 641         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 642         unsigned long flags;
 643         int retval;
 644
 645         if (up->port.type == PORT_16C950) {
 646                 /* Wake up and initialize UART */
 647                 up->acr = 0;
 648                 serial_outp(up, UART_LCR, 0xBF);
 649                 serial_outp(up, UART_EFR, UART_EFR_ECB);
 650                 serial_outp(up, UART_IER, 0);
 651                 serial_outp(up, UART_LCR, 0);
 652                 serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
 653                 serial_outp(up, UART_LCR, 0xBF);
 654                 serial_outp(up, UART_EFR, UART_EFR_ECB);
 655                 serial_outp(up, UART_LCR, 0);
 656         }
 657
 658 #ifdef CONFIG_SERIAL_8250_RSA
 659         /*
 660          * If this is an RSA port, see if we can kick it up to the
 661          * higher speed clock.
 662          */
 663         enable_rsa(up);
 664 #endif
 665
 666         /*
 667          * Clear the FIFO buffers and disable them.
 668          * (they will be reeanbled in set_termios())
 669          */
 670         if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
 671                 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 672                 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 673                                 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
 674                 serial_outp(up, UART_FCR, 0);
 675         }
 676
 677         /*
 678          * Clear the interrupt registers.
 679          */
 680         (void) serial_inp(up, UART_LSR);
 681         (void) serial_inp(up, UART_RX);
 682         (void) serial_inp(up, UART_IIR);
 683         (void) serial_inp(up, UART_MSR);
 684
 685         /*
 686          * At this point, there's no way the LSR could still be 0xff;
 687          * if it is, then bail out, because there's likely no UART
 688          * here.
 689          */
 690         if (!(up->port.flags & ASYNC_BUGGY_UART) &&
 691             (serial_inp(up, UART_LSR) == 0xff)) {
 692                 printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
 693                 return -ENODEV;
 694         }
 695
 696         if (up->su_type != SU_PORT_PORT) {
 697                 retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
 698                                      SA_SHIRQ, su_typev[up->su_type], up);
 699         } else {
 700                 retval = request_irq(up->port.irq, sunsu_serial_interrupt,
 701                                      SA_SHIRQ, su_typev[up->su_type], up);
 702         }
 703         if (retval) {
 704                 printk("su: Cannot register IRQ %d\n", up->port.irq);
 705                 return retval;
 706         }
 707
 708         /*
 709          * Now, initialize the UART
 710          */
 711         serial_outp(up, UART_LCR, UART_LCR_WLEN8);
 712
 713         spin_lock_irqsave(&up->port.lock, flags);
 714
 715         up->port.mctrl |= TIOCM_OUT2;
 716
 717         sunsu_set_mctrl(&up->port, up->port.mctrl);
 718         spin_unlock_irqrestore(&up->port.lock, flags);
 719
 720         /*
 721          * Finally, enable interrupts.  Note: Modem status interrupts
 722          * are set via set_termios(), which will be occurring imminently
 723          * anyway, so we don't enable them here.
 724          */
 725         up->ier = UART_IER_RLSI | UART_IER_RDI;
 726         serial_outp(up, UART_IER, up->ier);
 727
 728         if (up->port.flags & ASYNC_FOURPORT) {
 729                 unsigned int icp;
 730                 /*
 731                  * Enable interrupts on the AST Fourport board
 732                  */
 733                 icp = (up->port.iobase & 0xfe0) | 0x01f;
 734                 outb_p(0x80, icp);
 735                 (void) inb_p(icp);
 736         }
 737
 738         /*
 739          * And clear the interrupt registers again for luck.
 740          */
 741         (void) serial_inp(up, UART_LSR);
 742         (void) serial_inp(up, UART_RX);
 743         (void) serial_inp(up, UART_IIR);
 744         (void) serial_inp(up, UART_MSR);
 745
 746         return 0;
 747 }
 748
 749 static void sunsu_shutdown(struct uart_port *port)
 750 {
 751         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 752         unsigned long flags;
 753
 754         /*
 755          * Disable interrupts from this port
 756          */
 757         up->ier = 0;
 758         serial_outp(up, UART_IER, 0);
 759
 760         spin_lock_irqsave(&up->port.lock, flags);
 761         if (up->port.flags & ASYNC_FOURPORT) {
 762                 /* reset interrupts on the AST Fourport board */
 763                 inb((up->port.iobase & 0xfe0) | 0x1f);
 764                 up->port.mctrl |= TIOCM_OUT1;
 765         } else
 766                 up->port.mctrl &= ~TIOCM_OUT2;
 767
 768         sunsu_set_mctrl(&up->port, up->port.mctrl);
 769         spin_unlock_irqrestore(&up->port.lock, flags);
 770
 771         /*
 772          * Disable break condition and FIFOs
 773          */
 774         serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
 775         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
 776                                   UART_FCR_CLEAR_RCVR |
 777                                   UART_FCR_CLEAR_XMIT);
 778         serial_outp(up, UART_FCR, 0);
 779
 780 #ifdef CONFIG_SERIAL_8250_RSA
 781         /*
 782          * Reset the RSA board back to 115kbps compat mode.
 783          */
 784         disable_rsa(up);
 785 #endif
 786
 787         /*
 788          * Read data port to reset things.
 789          */
 790         (void) serial_in(up, UART_RX);
 791
 792         free_irq(up->port.irq, up);
 793 }
 794
 795 static void
 796 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
 797                    unsigned int iflag, unsigned int quot)
 798 {
 799         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 800         unsigned char cval, fcr = 0;
 801         unsigned long flags;
 802
 803         switch (cflag & CSIZE) {
 804         case CS5:
 805                 cval = 0x00;
 806                 break;
 807         case CS6:
 808                 cval = 0x01;
 809                 break;
 810         case CS7:
 811                 cval = 0x02;
 812                 break;
 813         default:
 814         case CS8:
 815                 cval = 0x03;
 816                 break;
 817         }
 818
 819         if (cflag & CSTOPB)
 820                 cval |= 0x04;
 821         if (cflag & PARENB)
 822                 cval |= UART_LCR_PARITY;
 823         if (!(cflag & PARODD))
 824                 cval |= UART_LCR_EPAR;
 825 #ifdef CMSPAR
 826         if (cflag & CMSPAR)
 827                 cval |= UART_LCR_SPAR;
 828 #endif
 829
 830         /*
 831          * Work around a bug in the Oxford Semiconductor 952 rev B
 832          * chip which causes it to seriously miscalculate baud rates
 833          * when DLL is 0.
 834          */
 835         if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
 836             up->rev == 0x5201)
 837                 quot ++;
 838
 839         if (uart_config[up->port.type].flags & UART_USE_FIFO) {
 840                 if ((up->port.uartclk / quot) < (2400 * 16))
 841                         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
 842 #ifdef CONFIG_SERIAL_8250_RSA
 843                 else if (up->port.type == PORT_RSA)
 844                         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
 845 #endif
 846                 else
 847                         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
 848         }
 849         if (up->port.type == PORT_16750)
 850                 fcr |= UART_FCR7_64BYTE;
 851
 852         /*
 853          * Ok, we're now changing the port state.  Do it with
 854          * interrupts disabled.
 855          */
 856         spin_lock_irqsave(&up->port.lock, flags);
 857
 858         /*
 859          * Update the per-port timeout.
 860          */
 861         uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
 862
 863         up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 864         if (iflag & INPCK)
 865                 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 866         if (iflag & (BRKINT | PARMRK))
 867                 up->port.read_status_mask |= UART_LSR_BI;
 868
 869         /*
 870          * Characteres to ignore
 871          */
 872         up->port.ignore_status_mask = 0;
 873         if (iflag & IGNPAR)
 874                 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 875         if (iflag & IGNBRK) {
 876                 up->port.ignore_status_mask |= UART_LSR_BI;
 877                 /*
 878                  * If we're ignoring parity and break indicators,
 879                  * ignore overruns too (for real raw support).
 880                  */
 881                 if (iflag & IGNPAR)
 882                         up->port.ignore_status_mask |= UART_LSR_OE;
 883         }
 884
 885         /*
 886          * ignore all characters if CREAD is not set
 887          */
 888         if ((cflag & CREAD) == 0)
 889                 up->port.ignore_status_mask |= UART_LSR_DR;
 890
 891         /*
 892          * CTS flow control flag and modem status interrupts
 893          */
 894         up->ier &= ~UART_IER_MSI;
 895         if (UART_ENABLE_MS(&up->port, cflag))
 896                 up->ier |= UART_IER_MSI;
 897
 898         serial_out(up, UART_IER, up->ier);
 899
 900         if (uart_config[up->port.type].flags & UART_STARTECH) {
 901                 serial_outp(up, UART_LCR, 0xBF);
 902                 serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
 903         }
 904         serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
 905         serial_outp(up, UART_DLL, quot & 0xff);         /* LS of divisor */
 906         serial_outp(up, UART_DLM, quot >> 8);           /* MS of divisor */
 907         if (up->port.type == PORT_16750)
 908                 serial_outp(up, UART_FCR, fcr);         /* set fcr */
 909         serial_outp(up, UART_LCR, cval);                /* reset DLAB */
 910         up->lcr = cval;                                 /* Save LCR */
 911         if (up->port.type != PORT_16750) {
 912                 if (fcr & UART_FCR_ENABLE_FIFO) {
 913                         /* emulated UARTs (Lucent Venus 167x) need two steps */
 914                         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
 915                 }
 916                 serial_outp(up, UART_FCR, fcr);         /* set fcr */
 917         }
 918
 919         up->cflag = cflag;
 920
 921         spin_unlock_irqrestore(&up->port.lock, flags);
 922 }
 923
 924 static void
 925 sunsu_set_termios(struct uart_port *port, struct termios *termios,
 926                   struct termios *old)
 927 {
 928         unsigned int baud, quot;
 929
 930         /*
 931          * Ask the core to calculate the divisor for us.
 932          */
 933         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 934         quot = uart_get_divisor(port, baud);
 935
 936         sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
 937 }
 938
 939 static void sunsu_release_port(struct uart_port *port)
 940 {
 941 }
 942
 943 static int sunsu_request_port(struct uart_port *port)
 944 {
 945         return 0;
 946 }
 947
 948 static void sunsu_config_port(struct uart_port *port, int flags)
 949 {
 950         struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
 951
 952         if (flags & UART_CONFIG_TYPE) {
 953                 /*
 954                  * We are supposed to call autoconfig here, but this requires
 955                  * splitting all the OBP probing crap from the UART probing.
 956                  * We'll do it when we kill sunsu.c altogether.
 957                  */
 958                 port->type = up->type_probed;   /* XXX */
 959         }
 960 }
 961
 962 static int
 963 sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
 964 {
 965         return -EINVAL;
 966 }
 967
 968 static const char *
 969 sunsu_type(struct uart_port *port)
 970 {
 971         int type = port->type;
 972
 973         if (type >= ARRAY_SIZE(uart_config))
 974                 type = 0;
 975         return uart_config[type].name;
 976 }
 977
 978 static struct uart_ops sunsu_pops = {
 979         .tx_empty       = sunsu_tx_empty,
 980         .set_mctrl      = sunsu_set_mctrl,
 981         .get_mctrl      = sunsu_get_mctrl,
 982         .stop_tx        = sunsu_stop_tx,
 983         .start_tx       = sunsu_start_tx,
 984         .stop_rx        = sunsu_stop_rx,
 985         .enable_ms      = sunsu_enable_ms,
 986         .break_ctl      = sunsu_break_ctl,
 987         .startup        = sunsu_startup,
 988         .shutdown       = sunsu_shutdown,
 989         .set_termios    = sunsu_set_termios,
 990         .type           = sunsu_type,
 991         .release_port   = sunsu_release_port,
 992         .request_port   = sunsu_request_port,
 993         .config_port    = sunsu_config_port,
 994         .verify_port    = sunsu_verify_port,
 995 };
 996
 997 #define UART_NR 4
 998
 999 static struct uart_sunsu_port sunsu_ports[UART_NR];
1000
1001 #ifdef CONFIG_SERIO
1002
1003 static DEFINE_SPINLOCK(sunsu_serio_lock);
1004
1005 static int sunsu_serio_write(struct serio *serio, unsigned char ch)
1006 {
1007         struct uart_sunsu_port *up = serio->port_data;
1008         unsigned long flags;
1009         int lsr;
1010
1011         spin_lock_irqsave(&sunsu_serio_lock, flags);
1012
1013         do {
1014                 lsr = serial_in(up, UART_LSR);
1015         } while (!(lsr & UART_LSR_THRE));
1016
1017         /* Send the character out. */
1018         serial_out(up, UART_TX, ch);
1019
1020         spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1021
1022         return 0;
1023 }
1024
1025 static int sunsu_serio_open(struct serio *serio)
1026 {
1027         struct uart_sunsu_port *up = serio->port_data;
1028         unsigned long flags;
1029         int ret;
1030
1031         spin_lock_irqsave(&sunsu_serio_lock, flags);
1032         if (!up->serio_open) {
1033                 up->serio_open = 1;
1034                 ret = 0;
1035         } else
1036                 ret = -EBUSY;
1037         spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1038
1039         return ret;
1040 }
1041
1042 static void sunsu_serio_close(struct serio *serio)
1043 {
1044         struct uart_sunsu_port *up = serio->port_data;
1045         unsigned long flags;
1046
1047         spin_lock_irqsave(&sunsu_serio_lock, flags);
1048         up->serio_open = 0;
1049         spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1050 }
1051
1052 #endif /* CONFIG_SERIO */
1053
1054 static void sunsu_autoconfig(struct uart_sunsu_port *up)
1055 {
1056         unsigned char status1, status2, scratch, scratch2, scratch3;
1057         unsigned char save_lcr, save_mcr;
1058         struct linux_ebus_device *dev = NULL;
1059         struct linux_ebus *ebus;
1060 #ifdef CONFIG_SPARC64
1061         struct sparc_isa_bridge *isa_br;
1062         struct sparc_isa_device *isa_dev;
1063 #endif
1064 #ifndef CONFIG_SPARC64
1065         struct linux_prom_registers reg0;
1066 #endif
1067         unsigned long flags;
1068
1069         if (!up->port_node || !up->su_type)
1070                 return;
1071
1072         up->type_probed = PORT_UNKNOWN;
1073         up->port.iotype = SERIAL_IO_MEM;
1074
1075         /*
1076          * First we look for Ebus-bases su's
1077          */
1078         for_each_ebus(ebus) {
1079                 for_each_ebusdev(dev, ebus) {
1080                         if (dev->prom_node == up->port_node) {
1081                                 /*
1082                                  * The EBus is broken on sparc; it delivers
1083                                  * virtual addresses in resources. Oh well...
1084                                  * This is correct on sparc64, though.
1085                                  */
1086                                 up->port.membase = (char *) dev->resource[0].start;
1087                                 /*
1088                                  * This is correct on both architectures.
1089                                  */
1090                                 up->port.mapbase = dev->resource[0].start;
1091                                 up->port.irq = dev->irqs[0];
1092                                 goto ebus_done;
1093                         }
1094                 }
1095         }
1096
1097 #ifdef CONFIG_SPARC64
1098         for_each_isa(isa_br) {
1099                 for_each_isadev(isa_dev, isa_br) {
1100                         if (isa_dev->prom_node == up->port_node) {
1101                                 /* Same on sparc64. Cool architecure... */
1102                                 up->port.membase = (char *) isa_dev->resource.start;
1103                                 up->port.mapbase = isa_dev->resource.start;
1104                                 up->port.irq = isa_dev->irq;
1105                                 goto ebus_done;
1106                         }
1107                 }
1108         }
1109 #endif
1110
1111 #ifdef CONFIG_SPARC64
1112         /*
1113          * Not on Ebus, bailing.
1114          */
1115         return;
1116 #else
1117         /*
1118          * Not on Ebus, must be OBIO.
1119          */
1120         if (prom_getproperty(up->port_node, "reg",
1121                              (char *)&reg0, sizeof(reg0)) == -1) {
1122                 prom_printf("sunsu: no \"reg\" property\n");
1123                 return;
1124         }
1125         prom_apply_obio_ranges(&reg0, 1);
1126         if (reg0.which_io != 0) {       /* Just in case... */
1127                 prom_printf("sunsu: bus number nonzero: 0x%x:%x\n",
1128                     reg0.which_io, reg0.phys_addr);
1129                 return;
1130         }
1131         up->port.mapbase = reg0.phys_addr;
1132         if ((up->port.membase = ioremap(reg0.phys_addr, reg0.reg_size)) == 0) {
1133                 prom_printf("sunsu: Cannot map registers.\n");
1134                 return;
1135         }
1136
1137         /*
1138          * 0x20 is sun4m thing, Dave Redman heritage.
1139          * See arch/sparc/kernel/irq.c.
1140          */
1141 #define IRQ_4M(n)       ((n)|0x20)
1142
1143         /*
1144          * There is no intr property on MrCoffee, so hardwire it.
1145          */
1146         up->port.irq = IRQ_4M(13);
1147 #endif
1148
1149 ebus_done:
1150
1151         spin_lock_irqsave(&up->port.lock, flags);
1152
1153         if (!(up->port.flags & ASYNC_BUGGY_UART)) {
1154                 /*
1155                  * Do a simple existence test first; if we fail this, there's
1156                  * no point trying anything else.
1157                  *
1158                  * 0x80 is used as a nonsense port to prevent against false
1159                  * positives due to ISA bus float.  The assumption is that
1160                  * 0x80 is a non-existent port; which should be safe since
1161                  * include/asm/io.h also makes this assumption.
1162                  */
1163                 scratch = serial_inp(up, UART_IER);
1164                 serial_outp(up, UART_IER, 0);
1165 #ifdef __i386__
1166                 outb(0xff, 0x080);
1167 #endif
1168                 scratch2 = serial_inp(up, UART_IER);
1169                 serial_outp(up, UART_IER, 0x0f);
1170 #ifdef __i386__
1171                 outb(0, 0x080);
1172 #endif
1173                 scratch3 = serial_inp(up, UART_IER);
1174                 serial_outp(up, UART_IER, scratch);
1175                 if (scratch2 != 0 || scratch3 != 0x0F)
1176                         goto out;       /* We failed; there's nothing here */
1177         }
1178
1179         save_mcr = serial_in(up, UART_MCR);
1180         save_lcr = serial_in(up, UART_LCR);
1181
1182         /*
1183          * Check to see if a UART is really there.  Certain broken
1184          * internal modems based on the Rockwell chipset fail this
1185          * test, because they apparently don't implement the loopback
1186          * test mode.  So this test is skipped on the COM 1 through
1187          * COM 4 ports.  This *should* be safe, since no board
1188          * manufacturer would be stupid enough to design a board
1189          * that conflicts with COM 1-4 --- we hope!
1190          */
1191         if (!(up->port.flags & ASYNC_SKIP_TEST)) {
1192                 serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
1193                 status1 = serial_inp(up, UART_MSR) & 0xF0;
1194                 serial_outp(up, UART_MCR, save_mcr);
1195                 if (status1 != 0x90)
1196                         goto out;       /* We failed loopback test */
1197         }
1198         serial_outp(up, UART_LCR, 0xBF);        /* set up for StarTech test */
1199         serial_outp(up, UART_EFR, 0);           /* EFR is the same as FCR */
1200         serial_outp(up, UART_LCR, 0);
1201         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1202         scratch = serial_in(up, UART_IIR) >> 6;
1203         switch (scratch) {
1204                 case 0:
1205                         up->port.type = PORT_16450;
1206                         break;
1207                 case 1:
1208                         up->port.type = PORT_UNKNOWN;
1209                         break;
1210                 case 2:
1211                         up->port.type = PORT_16550;
1212                         break;
1213                 case 3:
1214                         up->port.type = PORT_16550A;
1215                         break;
1216         }
1217         if (up->port.type == PORT_16550A) {
1218                 /* Check for Startech UART's */
1219                 serial_outp(up, UART_LCR, UART_LCR_DLAB);
1220                 if (serial_in(up, UART_EFR) == 0) {
1221                         up->port.type = PORT_16650;
1222                 } else {
1223                         serial_outp(up, UART_LCR, 0xBF);
1224                         if (serial_in(up, UART_EFR) == 0)
1225                                 up->port.type = PORT_16650V2;
1226                 }
1227         }
1228         if (up->port.type == PORT_16550A) {
1229                 /* Check for TI 16750 */
1230                 serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
1231                 serial_outp(up, UART_FCR,
1232                             UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1233                 scratch = serial_in(up, UART_IIR) >> 5;
1234                 if (scratch == 7) {
1235                         /*
1236                          * If this is a 16750, and not a cheap UART
1237                          * clone, then it should only go into 64 byte
1238                          * mode if the UART_FCR7_64BYTE bit was set
1239                          * while UART_LCR_DLAB was latched.
1240                          */
1241                         serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1242                         serial_outp(up, UART_LCR, 0);
1243                         serial_outp(up, UART_FCR,
1244                                     UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1245                         scratch = serial_in(up, UART_IIR) >> 5;
1246                         if (scratch == 6)
1247                                 up->port.type = PORT_16750;
1248                 }
1249                 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1250         }
1251         serial_outp(up, UART_LCR, save_lcr);
1252         if (up->port.type == PORT_16450) {
1253                 scratch = serial_in(up, UART_SCR);
1254                 serial_outp(up, UART_SCR, 0xa5);
1255                 status1 = serial_in(up, UART_SCR);
1256                 serial_outp(up, UART_SCR, 0x5a);
1257                 status2 = serial_in(up, UART_SCR);
1258                 serial_outp(up, UART_SCR, scratch);
1259
1260                 if ((status1 != 0xa5) || (status2 != 0x5a))
1261                         up->port.type = PORT_8250;
1262         }
1263
1264         up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
1265
1266         if (up->port.type == PORT_UNKNOWN)
1267                 goto out;
1268         up->type_probed = up->port.type;        /* XXX */
1269
1270         /*
1271          * Reset the UART.
1272          */
1273 #ifdef CONFIG_SERIAL_8250_RSA
1274         if (up->port.type == PORT_RSA)
1275                 serial_outp(up, UART_RSA_FRR, 0);
1276 #endif
1277         serial_outp(up, UART_MCR, save_mcr);
1278         serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
1279                                      UART_FCR_CLEAR_RCVR |
1280                                      UART_FCR_CLEAR_XMIT));
1281         serial_outp(up, UART_FCR, 0);
1282         (void)serial_in(up, UART_RX);
1283         serial_outp(up, UART_IER, 0);
1284
1285 out:
1286         spin_unlock_irqrestore(&up->port.lock, flags);
1287 }
1288
1289 static struct uart_driver sunsu_reg = {
1290         .owner                  = THIS_MODULE,
1291         .driver_name            = "serial",
1292         .devfs_name             = "tts/",
1293         .dev_name               = "ttyS",
1294         .major                  = TTY_MAJOR,
1295 };
1296
1297 static int __init sunsu_kbd_ms_init(struct uart_sunsu_port *up, int channel)
1298 {
1299         int quot, baud;
1300 #ifdef CONFIG_SERIO
1301         struct serio *serio;
1302 #endif
1303
1304         up->port.line = channel;
1305         up->port.type = PORT_UNKNOWN;
1306         up->port.uartclk = (SU_BASE_BAUD * 16);
1307
1308         if (up->su_type == SU_PORT_KBD) {
1309                 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1310                 baud = 1200;
1311         } else {
1312                 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1313                 baud = 4800;
1314         }
1315         quot = up->port.uartclk / (16 * baud);
1316
1317         sunsu_autoconfig(up);
1318         if (up->port.type == PORT_UNKNOWN)
1319                 return -1;
1320
1321         printk(KERN_INFO "su%d at 0x%p (irq = %s) is a %s\n",
1322                channel,
1323                up->port.membase, __irq_itoa(up->port.irq),
1324                sunsu_type(&up->port));
1325
1326 #ifdef CONFIG_SERIO
1327         up->serio = serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
1328         if (serio) {
1329                 memset(serio, 0, sizeof(*serio));
1330
1331                 serio->port_data = up;
1332
1333                 serio->id.type = SERIO_RS232;
1334                 if (up->su_type == SU_PORT_KBD) {
1335                         serio->id.proto = SERIO_SUNKBD;
1336                         strlcpy(serio->name, "sukbd", sizeof(serio->name));
1337                 } else {
1338                         serio->id.proto = SERIO_SUN;
1339                         serio->id.extra = 1;
1340                         strlcpy(serio->name, "sums", sizeof(serio->name));
1341                 }
1342                 strlcpy(serio->phys, (channel == 0 ? "su/serio0" : "su/serio1"),
1343                         sizeof(serio->phys));
1344
1345                 serio->write = sunsu_serio_write;
1346                 serio->open = sunsu_serio_open;
1347                 serio->close = sunsu_serio_close;
1348
1349                 serio_register_port(serio);
1350         } else {
1351                 printk(KERN_WARNING "su%d: not enough memory for serio port\n",
1352                         channel);
1353         }
1354 #endif
1355
1356         sunsu_change_speed(&up->port, up->cflag, 0, quot);
1357
1358         sunsu_startup(&up->port);
1359         return 0;
1360 }
1361
1362 /*
1363  * ------------------------------------------------------------
1364  * Serial console driver
1365  * ------------------------------------------------------------
1366  */
1367
1368 #ifdef CONFIG_SERIAL_SUNSU_CONSOLE
1369
1370 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1371
1372 /*
1373  *      Wait for transmitter & holding register to empty
1374  */
1375 static __inline__ void wait_for_xmitr(struct uart_sunsu_port *up)
1376 {
1377         unsigned int status, tmout = 10000;
1378
1379         /* Wait up to 10ms for the character(s) to be sent. */
1380         do {
1381                 status = serial_in(up, UART_LSR);
1382
1383                 if (status & UART_LSR_BI)
1384                         up->lsr_break_flag = UART_LSR_BI;
1385
1386                 if (--tmout == 0)
1387                         break;
1388                 udelay(1);
1389         } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1390
1391         /* Wait up to 1s for flow control if necessary */
1392         if (up->port.flags & ASYNC_CONS_FLOW) {
1393                 tmout = 1000000;
1394                 while (--tmout &&
1395                        ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
1396                         udelay(1);
1397         }
1398 }
1399
1400 /*
1401  *      Print a string to the serial port trying not to disturb
1402  *      any possible real use of the port...
1403  */
1404 static void sunsu_console_write(struct console *co, const char *s,
1405                                 unsigned int count)
1406 {
1407         struct uart_sunsu_port *up = &sunsu_ports[co->index];
1408         unsigned int ier;
1409         int i;
1410
1411         /*
1412          *      First save the UER then disable the interrupts
1413          */
1414         ier = serial_in(up, UART_IER);
1415         serial_out(up, UART_IER, 0);
1416
1417         /*
1418          *      Now, do each character
1419          */
1420         for (i = 0; i < count; i++, s++) {
1421                 wait_for_xmitr(up);
1422
1423                 /*
1424                  *      Send the character out.
1425                  *      If a LF, also do CR...
1426                  */
1427                 serial_out(up, UART_TX, *s);
1428                 if (*s == 10) {
1429                         wait_for_xmitr(up);
1430                         serial_out(up, UART_TX, 13);
1431                 }
1432         }
1433
1434         /*
1435          *      Finally, wait for transmitter to become empty
1436          *      and restore the IER
1437          */
1438         wait_for_xmitr(up);
1439         serial_out(up, UART_IER, ier);
1440 }
1441
1442 /*
1443  *      Setup initial baud/bits/parity. We do two things here:
1444  *      - construct a cflag setting for the first su_open()
1445  *      - initialize the serial port
1446  *      Return non-zero if we didn't find a serial port.
1447  */
1448 static int __init sunsu_console_setup(struct console *co, char *options)
1449 {
1450         struct uart_port *port;
1451         int baud = 9600;
1452         int bits = 8;
1453         int parity = 'n';
1454         int flow = 'n';
1455
1456         printk("Console: ttyS%d (SU)\n",
1457                (sunsu_reg.minor - 64) + co->index);
1458
1459         /*
1460          * Check whether an invalid uart number has been specified, and
1461          * if so, search for the first available port that does have
1462          * console support.
1463          */
1464         if (co->index >= UART_NR)
1465                 co->index = 0;
1466         port = &sunsu_ports[co->index].port;
1467
1468         /*
1469          * Temporary fix.
1470          */
1471         spin_lock_init(&port->lock);
1472
1473         if (options)
1474                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1475
1476         return uart_set_options(port, co, baud, parity, bits, flow);
1477 }
1478
1479 static struct console sunsu_cons = {
1480         .name   =       "ttyS",
1481         .write  =       sunsu_console_write,
1482         .device =       uart_console_device,
1483         .setup  =       sunsu_console_setup,
1484         .flags  =       CON_PRINTBUFFER,
1485         .index  =       -1,
1486         .data   =       &sunsu_reg,
1487 };
1488 #define SUNSU_CONSOLE   (&sunsu_cons)
1489
1490 /*
1491  *      Register console.
1492  */
1493
1494 static int __init sunsu_serial_console_init(void)
1495 {
1496         int i;
1497
1498         if (con_is_present())
1499                 return 0;
1500
1501         for (i = 0; i < UART_NR; i++) {
1502                 int this_minor = sunsu_reg.minor + i;
1503
1504                 if ((this_minor - 64) == (serial_console - 1))
1505                         break;
1506         }
1507         if (i == UART_NR)
1508                 return 0;
1509         if (sunsu_ports[i].port_node == 0)
1510                 return 0;
1511
1512         sunsu_cons.index = i;
1513         register_console(&sunsu_cons);
1514         return 0;
1515 }
1516 #else
1517 #define SUNSU_CONSOLE                   (NULL)
1518 #define sunsu_serial_console_init()     do { } while (0)
1519 #endif
1520
1521 static int __init sunsu_serial_init(void)
1522 {
1523         int instance, ret, i;
1524
1525         /* How many instances do we need?  */
1526         instance = 0;
1527         for (i = 0; i < UART_NR; i++) {
1528                 struct uart_sunsu_port *up = &sunsu_ports[i];
1529
1530                 if (up->su_type == SU_PORT_MS ||
1531                     up->su_type == SU_PORT_KBD)
1532                         continue;
1533
1534                 up->port.flags |= ASYNC_BOOT_AUTOCONF;
1535                 up->port.type = PORT_UNKNOWN;
1536                 up->port.uartclk = (SU_BASE_BAUD * 16);
1537
1538                 sunsu_autoconfig(up);
1539                 if (up->port.type == PORT_UNKNOWN)
1540                         continue;
1541
1542                 up->port.line = instance++;
1543                 up->port.ops = &sunsu_pops;
1544         }
1545
1546         sunsu_reg.minor = sunserial_current_minor;
1547         sunserial_current_minor += instance;
1548
1549         sunsu_reg.nr = instance;
1550         sunsu_reg.cons = SUNSU_CONSOLE;
1551
1552         ret = uart_register_driver(&sunsu_reg);
1553         if (ret < 0)
1554                 return ret;
1555
1556         sunsu_serial_console_init();
1557         for (i = 0; i < UART_NR; i++) {
1558                 struct uart_sunsu_port *up = &sunsu_ports[i];
1559
1560                 /* Do not register Keyboard/Mouse lines with UART
1561                  * layer.
1562                  */
1563                 if (up->su_type == SU_PORT_MS ||
1564                     up->su_type == SU_PORT_KBD)
1565                         continue;
1566
1567                 if (up->port.type == PORT_UNKNOWN)
1568                         continue;
1569
1570                 uart_add_one_port(&sunsu_reg, &up->port);
1571         }
1572
1573         return 0;
1574 }
1575
1576 static int su_node_ok(int node, char *name, int namelen)
1577 {
1578         if (strncmp(name, "su", namelen) == 0 ||
1579             strncmp(name, "su_pnp", namelen) == 0)
1580                 return 1;
1581
1582         if (strncmp(name, "serial", namelen) == 0) {
1583                 char compat[32];
1584                 int clen;
1585
1586                 /* Is it _really_ a 'su' device? */
1587                 clen = prom_getproperty(node, "compatible", compat, sizeof(compat));
1588                 if (clen > 0) {
1589                         if (strncmp(compat, "sab82532", 8) == 0) {
1590                                 /* Nope, Siemens serial, not for us. */
1591                                 return 0;
1592                         }
1593                 }
1594                 return 1;
1595         }
1596
1597         return 0;
1598 }
1599
1600 #define SU_PROPSIZE     128
1601
1602 /*
1603  * Scan status structure.
1604  * "prop" is a local variable but it eats stack to keep it in each
1605  * stack frame of a recursive procedure.
1606  */
1607 struct su_probe_scan {
1608         int msnode, kbnode;     /* PROM nodes for mouse and keyboard */
1609         int msx, kbx;           /* minors for mouse and keyboard */
1610         int devices;            /* scan index */
1611         char prop[SU_PROPSIZE];
1612 };
1613
1614 /*
1615  * We have several platforms which present 'su' in different parts
1616  * of the device tree. 'su' may be found under obio, ebus, isa and pci.
1617  * We walk over the tree and find them wherever PROM hides them.
1618  */
1619 static void __init su_probe_any(struct su_probe_scan *t, int sunode)
1620 {
1621         struct uart_sunsu_port *up;
1622         int len;
1623
1624         if (t->devices >= UART_NR)
1625                 return;
1626
1627         for (; sunode != 0; sunode = prom_getsibling(sunode)) {
1628                 len = prom_getproperty(sunode, "name", t->prop, SU_PROPSIZE);
1629                 if (len <= 1)
1630                         continue;               /* Broken PROM node */
1631
1632                 if (su_node_ok(sunode, t->prop, len)) {
1633                         up = &sunsu_ports[t->devices];
1634                         if (t->kbnode != 0 && sunode == t->kbnode) {
1635                                 t->kbx = t->devices;
1636                                 up->su_type = SU_PORT_KBD;
1637                         } else if (t->msnode != 0 && sunode == t->msnode) {
1638                                 t->msx = t->devices;
1639                                 up->su_type = SU_PORT_MS;
1640                         } else {
1641 #ifdef CONFIG_SPARC64
1642                                 /*
1643                                  * Do not attempt to use the truncated
1644                                  * keyboard/mouse ports as serial ports
1645                                  * on Ultras with PC keyboard attached.
1646                                  */
1647                                 if (prom_getbool(sunode, "mouse"))
1648                                         continue;
1649                                 if (prom_getbool(sunode, "keyboard"))
1650                                         continue;
1651 #endif
1652                                 up->su_type = SU_PORT_PORT;
1653                         }
1654                         up->port_node = sunode;
1655                         ++t->devices;
1656                 } else {
1657                         su_probe_any(t, prom_getchild(sunode));
1658                 }
1659         }
1660 }
1661
1662 static int __init sunsu_probe(void)
1663 {
1664         int node;
1665         int len;
1666         struct su_probe_scan scan;
1667
1668         /*
1669          * First, we scan the tree.
1670          */
1671         scan.devices = 0;
1672         scan.msx = -1;
1673         scan.kbx = -1;
1674         scan.kbnode = 0;
1675         scan.msnode = 0;
1676
1677         /*
1678          * Get the nodes for keyboard and mouse from 'aliases'...
1679          */
1680         node = prom_getchild(prom_root_node);
1681         node = prom_searchsiblings(node, "aliases");
1682         if (node != 0) {
1683                 len = prom_getproperty(node, "keyboard", scan.prop, SU_PROPSIZE);
1684                 if (len > 0) {
1685                         scan.prop[len] = 0;
1686                         scan.kbnode = prom_finddevice(scan.prop);
1687                 }
1688
1689                 len = prom_getproperty(node, "mouse", scan.prop, SU_PROPSIZE);
1690                 if (len > 0) {
1691                         scan.prop[len] = 0;
1692                         scan.msnode = prom_finddevice(scan.prop);
1693                 }
1694         }
1695
1696         su_probe_any(&scan, prom_getchild(prom_root_node));
1697
1698         /*
1699          * Second, we process the special case of keyboard and mouse.
1700          *
1701          * Currently if we got keyboard and mouse hooked to "su" ports
1702          * we do not use any possible remaining "su" as a serial port.
1703          * Thus, we ignore values of .msx and .kbx, then compact ports.
1704          */
1705         if (scan.msx != -1 && scan.kbx != -1) {
1706                 sunsu_ports[0].su_type = SU_PORT_MS;
1707                 sunsu_ports[0].port_node = scan.msnode;
1708                 sunsu_kbd_ms_init(&sunsu_ports[0], 0);
1709
1710                 sunsu_ports[1].su_type = SU_PORT_KBD;
1711                 sunsu_ports[1].port_node = scan.kbnode;
1712                 sunsu_kbd_ms_init(&sunsu_ports[1], 1);
1713
1714                 return 0;
1715         }
1716
1717         if (scan.msx != -1 || scan.kbx != -1) {
1718                 printk("sunsu_probe: cannot match keyboard and mouse, confused\n");
1719                 return -ENODEV;
1720         }
1721
1722         if (scan.devices == 0)
1723                 return -ENODEV;
1724
1725         /*
1726          * Console must be initiated after the generic initialization.
1727          */
1728         sunsu_serial_init();
1729
1730         return 0;
1731 }
1732
1733 static void __exit sunsu_exit(void)
1734 {
1735         int i, saw_uart;
1736
1737         saw_uart = 0;
1738         for (i = 0; i < UART_NR; i++) {
1739                 struct uart_sunsu_port *up = &sunsu_ports[i];
1740
1741                 if (up->su_type == SU_PORT_MS ||
1742                     up->su_type == SU_PORT_KBD) {
1743 #ifdef CONFIG_SERIO
1744                         if (up->serio) {
1745                                 serio_unregister_port(up->serio);
1746                                 up->serio = NULL;
1747                         }
1748 #endif
1749                 } else if (up->port.type != PORT_UNKNOWN) {
1750                         uart_remove_one_port(&sunsu_reg, &up->port);
1751                         saw_uart++;
1752                 }
1753         }
1754
1755         if (saw_uart)
1756                 uart_unregister_driver(&sunsu_reg);
1757 }
1758
1759 module_init(sunsu_probe);
1760 module_exit(sunsu_exit);