linux/drivers/serial/sa1100.c
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   1/*
   2 *  linux/drivers/char/sa1100.c
   3 *
   4 *  Driver for SA11x0 serial ports
   5 *
   6 *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
   7 *
   8 *  Copyright (C) 2000 Deep Blue Solutions Ltd.
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23 *
  24 *  $Id: sa1100.c,v 1.50 2002/07/29 14:41:04 rmk Exp $
  25 *
  26 */
  27
  28#if defined(CONFIG_SERIAL_SA1100_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  29#define SUPPORT_SYSRQ
  30#endif
  31
  32#include <linux/module.h>
  33#include <linux/ioport.h>
  34#include <linux/init.h>
  35#include <linux/console.h>
  36#include <linux/sysrq.h>
  37#include <linux/platform_device.h>
  38#include <linux/tty.h>
  39#include <linux/tty_flip.h>
  40#include <linux/serial_core.h>
  41#include <linux/serial.h>
  42
  43#include <asm/io.h>
  44#include <asm/irq.h>
  45#include <asm/hardware.h>
  46#include <asm/mach/serial_sa1100.h>
  47
  48/* We've been assigned a range on the "Low-density serial ports" major */
  49#define SERIAL_SA1100_MAJOR     204
  50#define MINOR_START             5
  51
  52#define NR_PORTS                3
  53
  54#define SA1100_ISR_PASS_LIMIT   256
  55
  56/*
  57 * Convert from ignore_status_mask or read_status_mask to UTSR[01]
  58 */
  59#define SM_TO_UTSR0(x)  ((x) & 0xff)
  60#define SM_TO_UTSR1(x)  ((x) >> 8)
  61#define UTSR0_TO_SM(x)  ((x))
  62#define UTSR1_TO_SM(x)  ((x) << 8)
  63
  64#define UART_GET_UTCR0(sport)   __raw_readl((sport)->port.membase + UTCR0)
  65#define UART_GET_UTCR1(sport)   __raw_readl((sport)->port.membase + UTCR1)
  66#define UART_GET_UTCR2(sport)   __raw_readl((sport)->port.membase + UTCR2)
  67#define UART_GET_UTCR3(sport)   __raw_readl((sport)->port.membase + UTCR3)
  68#define UART_GET_UTSR0(sport)   __raw_readl((sport)->port.membase + UTSR0)
  69#define UART_GET_UTSR1(sport)   __raw_readl((sport)->port.membase + UTSR1)
  70#define UART_GET_CHAR(sport)    __raw_readl((sport)->port.membase + UTDR)
  71
  72#define UART_PUT_UTCR0(sport,v) __raw_writel((v),(sport)->port.membase + UTCR0)
  73#define UART_PUT_UTCR1(sport,v) __raw_writel((v),(sport)->port.membase + UTCR1)
  74#define UART_PUT_UTCR2(sport,v) __raw_writel((v),(sport)->port.membase + UTCR2)
  75#define UART_PUT_UTCR3(sport,v) __raw_writel((v),(sport)->port.membase + UTCR3)
  76#define UART_PUT_UTSR0(sport,v) __raw_writel((v),(sport)->port.membase + UTSR0)
  77#define UART_PUT_UTSR1(sport,v) __raw_writel((v),(sport)->port.membase + UTSR1)
  78#define UART_PUT_CHAR(sport,v)  __raw_writel((v),(sport)->port.membase + UTDR)
  79
  80/*
  81 * This is the size of our serial port register set.
  82 */
  83#define UART_PORT_SIZE  0x24
  84
  85/*
  86 * This determines how often we check the modem status signals
  87 * for any change.  They generally aren't connected to an IRQ
  88 * so we have to poll them.  We also check immediately before
  89 * filling the TX fifo incase CTS has been dropped.
  90 */
  91#define MCTRL_TIMEOUT   (250*HZ/1000)
  92
  93struct sa1100_port {
  94        struct uart_port        port;
  95        struct timer_list       timer;
  96        unsigned int            old_status;
  97};
  98
  99/*
 100 * Handle any change of modem status signal since we were last called.
 101 */
 102static void sa1100_mctrl_check(struct sa1100_port *sport)
 103{
 104        unsigned int status, changed;
 105
 106        status = sport->port.ops->get_mctrl(&sport->port);
 107        changed = status ^ sport->old_status;
 108
 109        if (changed == 0)
 110                return;
 111
 112        sport->old_status = status;
 113
 114        if (changed & TIOCM_RI)
 115                sport->port.icount.rng++;
 116        if (changed & TIOCM_DSR)
 117                sport->port.icount.dsr++;
 118        if (changed & TIOCM_CAR)
 119                uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
 120        if (changed & TIOCM_CTS)
 121                uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
 122
 123        wake_up_interruptible(&sport->port.info->delta_msr_wait);
 124}
 125
 126/*
 127 * This is our per-port timeout handler, for checking the
 128 * modem status signals.
 129 */
 130static void sa1100_timeout(unsigned long data)
 131{
 132        struct sa1100_port *sport = (struct sa1100_port *)data;
 133        unsigned long flags;
 134
 135        if (sport->port.info) {
 136                spin_lock_irqsave(&sport->port.lock, flags);
 137                sa1100_mctrl_check(sport);
 138                spin_unlock_irqrestore(&sport->port.lock, flags);
 139
 140                mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
 141        }
 142}
 143
 144/*
 145 * interrupts disabled on entry
 146 */
 147static void sa1100_stop_tx(struct uart_port *port)
 148{
 149        struct sa1100_port *sport = (struct sa1100_port *)port;
 150        u32 utcr3;
 151
 152        utcr3 = UART_GET_UTCR3(sport);
 153        UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_TIE);
 154        sport->port.read_status_mask &= ~UTSR0_TO_SM(UTSR0_TFS);
 155}
 156
 157/*
 158 * port locked and interrupts disabled
 159 */
 160static void sa1100_start_tx(struct uart_port *port)
 161{
 162        struct sa1100_port *sport = (struct sa1100_port *)port;
 163        u32 utcr3;
 164
 165        utcr3 = UART_GET_UTCR3(sport);
 166        sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS);
 167        UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE);
 168}
 169
 170/*
 171 * Interrupts enabled
 172 */
 173static void sa1100_stop_rx(struct uart_port *port)
 174{
 175        struct sa1100_port *sport = (struct sa1100_port *)port;
 176        u32 utcr3;
 177
 178        utcr3 = UART_GET_UTCR3(sport);
 179        UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_RIE);
 180}
 181
 182/*
 183 * Set the modem control timer to fire immediately.
 184 */
 185static void sa1100_enable_ms(struct uart_port *port)
 186{
 187        struct sa1100_port *sport = (struct sa1100_port *)port;
 188
 189        mod_timer(&sport->timer, jiffies);
 190}
 191
 192static void
 193sa1100_rx_chars(struct sa1100_port *sport)
 194{
 195        struct tty_struct *tty = sport->port.info->tty;
 196        unsigned int status, ch, flg;
 197
 198        status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
 199                 UTSR0_TO_SM(UART_GET_UTSR0(sport));
 200        while (status & UTSR1_TO_SM(UTSR1_RNE)) {
 201                ch = UART_GET_CHAR(sport);
 202
 203                sport->port.icount.rx++;
 204
 205                flg = TTY_NORMAL;
 206
 207                /*
 208                 * note that the error handling code is
 209                 * out of the main execution path
 210                 */
 211                if (status & UTSR1_TO_SM(UTSR1_PRE | UTSR1_FRE | UTSR1_ROR)) {
 212                        if (status & UTSR1_TO_SM(UTSR1_PRE))
 213                                sport->port.icount.parity++;
 214                        else if (status & UTSR1_TO_SM(UTSR1_FRE))
 215                                sport->port.icount.frame++;
 216                        if (status & UTSR1_TO_SM(UTSR1_ROR))
 217                                sport->port.icount.overrun++;
 218
 219                        status &= sport->port.read_status_mask;
 220
 221                        if (status & UTSR1_TO_SM(UTSR1_PRE))
 222                                flg = TTY_PARITY;
 223                        else if (status & UTSR1_TO_SM(UTSR1_FRE))
 224                                flg = TTY_FRAME;
 225
 226#ifdef SUPPORT_SYSRQ
 227                        sport->port.sysrq = 0;
 228#endif
 229                }
 230
 231                if (uart_handle_sysrq_char(&sport->port, ch))
 232                        goto ignore_char;
 233
 234                uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);
 235
 236        ignore_char:
 237                status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
 238                         UTSR0_TO_SM(UART_GET_UTSR0(sport));
 239        }
 240        tty_flip_buffer_push(tty);
 241}
 242
 243static void sa1100_tx_chars(struct sa1100_port *sport)
 244{
 245        struct circ_buf *xmit = &sport->port.info->xmit;
 246
 247        if (sport->port.x_char) {
 248                UART_PUT_CHAR(sport, sport->port.x_char);
 249                sport->port.icount.tx++;
 250                sport->port.x_char = 0;
 251                return;
 252        }
 253
 254        /*
 255         * Check the modem control lines before
 256         * transmitting anything.
 257         */
 258        sa1100_mctrl_check(sport);
 259
 260        if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
 261                sa1100_stop_tx(&sport->port);
 262                return;
 263        }
 264
 265        /*
 266         * Tried using FIFO (not checking TNF) for fifo fill:
 267         * still had the '4 bytes repeated' problem.
 268         */
 269        while (UART_GET_UTSR1(sport) & UTSR1_TNF) {
 270                UART_PUT_CHAR(sport, xmit->buf[xmit->tail]);
 271                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 272                sport->port.icount.tx++;
 273                if (uart_circ_empty(xmit))
 274                        break;
 275        }
 276
 277        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 278                uart_write_wakeup(&sport->port);
 279
 280        if (uart_circ_empty(xmit))
 281                sa1100_stop_tx(&sport->port);
 282}
 283
 284static irqreturn_t sa1100_int(int irq, void *dev_id)
 285{
 286        struct sa1100_port *sport = dev_id;
 287        unsigned int status, pass_counter = 0;
 288
 289        spin_lock(&sport->port.lock);
 290        status = UART_GET_UTSR0(sport);
 291        status &= SM_TO_UTSR0(sport->port.read_status_mask) | ~UTSR0_TFS;
 292        do {
 293                if (status & (UTSR0_RFS | UTSR0_RID)) {
 294                        /* Clear the receiver idle bit, if set */
 295                        if (status & UTSR0_RID)
 296                                UART_PUT_UTSR0(sport, UTSR0_RID);
 297                        sa1100_rx_chars(sport);
 298                }
 299
 300                /* Clear the relevant break bits */
 301                if (status & (UTSR0_RBB | UTSR0_REB))
 302                        UART_PUT_UTSR0(sport, status & (UTSR0_RBB | UTSR0_REB));
 303
 304                if (status & UTSR0_RBB)
 305                        sport->port.icount.brk++;
 306
 307                if (status & UTSR0_REB)
 308                        uart_handle_break(&sport->port);
 309
 310                if (status & UTSR0_TFS)
 311                        sa1100_tx_chars(sport);
 312                if (pass_counter++ > SA1100_ISR_PASS_LIMIT)
 313                        break;
 314                status = UART_GET_UTSR0(sport);
 315                status &= SM_TO_UTSR0(sport->port.read_status_mask) |
 316                          ~UTSR0_TFS;
 317        } while (status & (UTSR0_TFS | UTSR0_RFS | UTSR0_RID));
 318        spin_unlock(&sport->port.lock);
 319
 320        return IRQ_HANDLED;
 321}
 322
 323/*
 324 * Return TIOCSER_TEMT when transmitter is not busy.
 325 */
 326static unsigned int sa1100_tx_empty(struct uart_port *port)
 327{
 328        struct sa1100_port *sport = (struct sa1100_port *)port;
 329
 330        return UART_GET_UTSR1(sport) & UTSR1_TBY ? 0 : TIOCSER_TEMT;
 331}
 332
 333static unsigned int sa1100_get_mctrl(struct uart_port *port)
 334{
 335        return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 336}
 337
 338static void sa1100_set_mctrl(struct uart_port *port, unsigned int mctrl)
 339{
 340}
 341
 342/*
 343 * Interrupts always disabled.
 344 */
 345static void sa1100_break_ctl(struct uart_port *port, int break_state)
 346{
 347        struct sa1100_port *sport = (struct sa1100_port *)port;
 348        unsigned long flags;
 349        unsigned int utcr3;
 350
 351        spin_lock_irqsave(&sport->port.lock, flags);
 352        utcr3 = UART_GET_UTCR3(sport);
 353        if (break_state == -1)
 354                utcr3 |= UTCR3_BRK;
 355        else
 356                utcr3 &= ~UTCR3_BRK;
 357        UART_PUT_UTCR3(sport, utcr3);
 358        spin_unlock_irqrestore(&sport->port.lock, flags);
 359}
 360
 361static int sa1100_startup(struct uart_port *port)
 362{
 363        struct sa1100_port *sport = (struct sa1100_port *)port;
 364        int retval;
 365
 366        /*
 367         * Allocate the IRQ
 368         */
 369        retval = request_irq(sport->port.irq, sa1100_int, 0,
 370                             "sa11x0-uart", sport);
 371        if (retval)
 372                return retval;
 373
 374        /*
 375         * Finally, clear and enable interrupts
 376         */
 377        UART_PUT_UTSR0(sport, -1);
 378        UART_PUT_UTCR3(sport, UTCR3_RXE | UTCR3_TXE | UTCR3_RIE);
 379
 380        /*
 381         * Enable modem status interrupts
 382         */
 383        spin_lock_irq(&sport->port.lock);
 384        sa1100_enable_ms(&sport->port);
 385        spin_unlock_irq(&sport->port.lock);
 386
 387        return 0;
 388}
 389
 390static void sa1100_shutdown(struct uart_port *port)
 391{
 392        struct sa1100_port *sport = (struct sa1100_port *)port;
 393
 394        /*
 395         * Stop our timer.
 396         */
 397        del_timer_sync(&sport->timer);
 398
 399        /*
 400         * Free the interrupt
 401         */
 402        free_irq(sport->port.irq, sport);
 403
 404        /*
 405         * Disable all interrupts, port and break condition.
 406         */
 407        UART_PUT_UTCR3(sport, 0);
 408}
 409
 410static void
 411sa1100_set_termios(struct uart_port *port, struct ktermios *termios,
 412                   struct ktermios *old)
 413{
 414        struct sa1100_port *sport = (struct sa1100_port *)port;
 415        unsigned long flags;
 416        unsigned int utcr0, old_utcr3, baud, quot;
 417        unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
 418
 419        /*
 420         * We only support CS7 and CS8.
 421         */
 422        while ((termios->c_cflag & CSIZE) != CS7 &&
 423               (termios->c_cflag & CSIZE) != CS8) {
 424                termios->c_cflag &= ~CSIZE;
 425                termios->c_cflag |= old_csize;
 426                old_csize = CS8;
 427        }
 428
 429        if ((termios->c_cflag & CSIZE) == CS8)
 430                utcr0 = UTCR0_DSS;
 431        else
 432                utcr0 = 0;
 433
 434        if (termios->c_cflag & CSTOPB)
 435                utcr0 |= UTCR0_SBS;
 436        if (termios->c_cflag & PARENB) {
 437                utcr0 |= UTCR0_PE;
 438                if (!(termios->c_cflag & PARODD))
 439                        utcr0 |= UTCR0_OES;
 440        }
 441
 442        /*
 443         * Ask the core to calculate the divisor for us.
 444         */
 445        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
 446        quot = uart_get_divisor(port, baud);
 447
 448        spin_lock_irqsave(&sport->port.lock, flags);
 449
 450        sport->port.read_status_mask &= UTSR0_TO_SM(UTSR0_TFS);
 451        sport->port.read_status_mask |= UTSR1_TO_SM(UTSR1_ROR);
 452        if (termios->c_iflag & INPCK)
 453                sport->port.read_status_mask |=
 454                                UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
 455        if (termios->c_iflag & (BRKINT | PARMRK))
 456                sport->port.read_status_mask |=
 457                                UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
 458
 459        /*
 460         * Characters to ignore
 461         */
 462        sport->port.ignore_status_mask = 0;
 463        if (termios->c_iflag & IGNPAR)
 464                sport->port.ignore_status_mask |=
 465                                UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
 466        if (termios->c_iflag & IGNBRK) {
 467                sport->port.ignore_status_mask |=
 468                                UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
 469                /*
 470                 * If we're ignoring parity and break indicators,
 471                 * ignore overruns too (for real raw support).
 472                 */
 473                if (termios->c_iflag & IGNPAR)
 474                        sport->port.ignore_status_mask |=
 475                                UTSR1_TO_SM(UTSR1_ROR);
 476        }
 477
 478        del_timer_sync(&sport->timer);
 479
 480        /*
 481         * Update the per-port timeout.
 482         */
 483        uart_update_timeout(port, termios->c_cflag, baud);
 484
 485        /*
 486         * disable interrupts and drain transmitter
 487         */
 488        old_utcr3 = UART_GET_UTCR3(sport);
 489        UART_PUT_UTCR3(sport, old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE));
 490
 491        while (UART_GET_UTSR1(sport) & UTSR1_TBY)
 492                barrier();
 493
 494        /* then, disable everything */
 495        UART_PUT_UTCR3(sport, 0);
 496
 497        /* set the parity, stop bits and data size */
 498        UART_PUT_UTCR0(sport, utcr0);
 499
 500        /* set the baud rate */
 501        quot -= 1;
 502        UART_PUT_UTCR1(sport, ((quot & 0xf00) >> 8));
 503        UART_PUT_UTCR2(sport, (quot & 0xff));
 504
 505        UART_PUT_UTSR0(sport, -1);
 506
 507        UART_PUT_UTCR3(sport, old_utcr3);
 508
 509        if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
 510                sa1100_enable_ms(&sport->port);
 511
 512        spin_unlock_irqrestore(&sport->port.lock, flags);
 513}
 514
 515static const char *sa1100_type(struct uart_port *port)
 516{
 517        struct sa1100_port *sport = (struct sa1100_port *)port;
 518
 519        return sport->port.type == PORT_SA1100 ? "SA1100" : NULL;
 520}
 521
 522/*
 523 * Release the memory region(s) being used by 'port'.
 524 */
 525static void sa1100_release_port(struct uart_port *port)
 526{
 527        struct sa1100_port *sport = (struct sa1100_port *)port;
 528
 529        release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
 530}
 531
 532/*
 533 * Request the memory region(s) being used by 'port'.
 534 */
 535static int sa1100_request_port(struct uart_port *port)
 536{
 537        struct sa1100_port *sport = (struct sa1100_port *)port;
 538
 539        return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
 540                        "sa11x0-uart") != NULL ? 0 : -EBUSY;
 541}
 542
 543/*
 544 * Configure/autoconfigure the port.
 545 */
 546static void sa1100_config_port(struct uart_port *port, int flags)
 547{
 548        struct sa1100_port *sport = (struct sa1100_port *)port;
 549
 550        if (flags & UART_CONFIG_TYPE &&
 551            sa1100_request_port(&sport->port) == 0)
 552                sport->port.type = PORT_SA1100;
 553}
 554
 555/*
 556 * Verify the new serial_struct (for TIOCSSERIAL).
 557 * The only change we allow are to the flags and type, and
 558 * even then only between PORT_SA1100 and PORT_UNKNOWN
 559 */
 560static int
 561sa1100_verify_port(struct uart_port *port, struct serial_struct *ser)
 562{
 563        struct sa1100_port *sport = (struct sa1100_port *)port;
 564        int ret = 0;
 565
 566        if (ser->type != PORT_UNKNOWN && ser->type != PORT_SA1100)
 567                ret = -EINVAL;
 568        if (sport->port.irq != ser->irq)
 569                ret = -EINVAL;
 570        if (ser->io_type != SERIAL_IO_MEM)
 571                ret = -EINVAL;
 572        if (sport->port.uartclk / 16 != ser->baud_base)
 573                ret = -EINVAL;
 574        if ((void *)sport->port.mapbase != ser->iomem_base)
 575                ret = -EINVAL;
 576        if (sport->port.iobase != ser->port)
 577                ret = -EINVAL;
 578        if (ser->hub6 != 0)
 579                ret = -EINVAL;
 580        return ret;
 581}
 582
 583static struct uart_ops sa1100_pops = {
 584        .tx_empty       = sa1100_tx_empty,
 585        .set_mctrl      = sa1100_set_mctrl,
 586        .get_mctrl      = sa1100_get_mctrl,
 587        .stop_tx        = sa1100_stop_tx,
 588        .start_tx       = sa1100_start_tx,
 589        .stop_rx        = sa1100_stop_rx,
 590        .enable_ms      = sa1100_enable_ms,
 591        .break_ctl      = sa1100_break_ctl,
 592        .startup        = sa1100_startup,
 593        .shutdown       = sa1100_shutdown,
 594        .set_termios    = sa1100_set_termios,
 595        .type           = sa1100_type,
 596        .release_port   = sa1100_release_port,
 597        .request_port   = sa1100_request_port,
 598        .config_port    = sa1100_config_port,
 599        .verify_port    = sa1100_verify_port,
 600};
 601
 602static struct sa1100_port sa1100_ports[NR_PORTS];
 603
 604/*
 605 * Setup the SA1100 serial ports.  Note that we don't include the IrDA
 606 * port here since we have our own SIR/FIR driver (see drivers/net/irda)
 607 *
 608 * Note also that we support "console=ttySAx" where "x" is either 0 or 1.
 609 * Which serial port this ends up being depends on the machine you're
 610 * running this kernel on.  I'm not convinced that this is a good idea,
 611 * but that's the way it traditionally works.
 612 *
 613 * Note that NanoEngine UART3 becomes UART2, and UART2 is no longer
 614 * used here.
 615 */
 616static void __init sa1100_init_ports(void)
 617{
 618        static int first = 1;
 619        int i;
 620
 621        if (!first)
 622                return;
 623        first = 0;
 624
 625        for (i = 0; i < NR_PORTS; i++) {
 626                sa1100_ports[i].port.uartclk   = 3686400;
 627                sa1100_ports[i].port.ops       = &sa1100_pops;
 628                sa1100_ports[i].port.fifosize  = 8;
 629                sa1100_ports[i].port.line      = i;
 630                sa1100_ports[i].port.iotype    = UPIO_MEM;
 631                init_timer(&sa1100_ports[i].timer);
 632                sa1100_ports[i].timer.function = sa1100_timeout;
 633                sa1100_ports[i].timer.data     = (unsigned long)&sa1100_ports[i];
 634        }
 635
 636        /*
 637         * make transmit lines outputs, so that when the port
 638         * is closed, the output is in the MARK state.
 639         */
 640        PPDR |= PPC_TXD1 | PPC_TXD3;
 641        PPSR |= PPC_TXD1 | PPC_TXD3;
 642}
 643
 644void __init sa1100_register_uart_fns(struct sa1100_port_fns *fns)
 645{
 646        if (fns->get_mctrl)
 647                sa1100_pops.get_mctrl = fns->get_mctrl;
 648        if (fns->set_mctrl)
 649                sa1100_pops.set_mctrl = fns->set_mctrl;
 650
 651        sa1100_pops.pm       = fns->pm;
 652        sa1100_pops.set_wake = fns->set_wake;
 653}
 654
 655void __init sa1100_register_uart(int idx, int port)
 656{
 657        if (idx >= NR_PORTS) {
 658                printk(KERN_ERR "%s: bad index number %d\n", __FUNCTION__, idx);
 659                return;
 660        }
 661
 662        switch (port) {
 663        case 1:
 664                sa1100_ports[idx].port.membase = (void __iomem *)&Ser1UTCR0;
 665                sa1100_ports[idx].port.mapbase = _Ser1UTCR0;
 666                sa1100_ports[idx].port.irq     = IRQ_Ser1UART;
 667                sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
 668                break;
 669
 670        case 2:
 671                sa1100_ports[idx].port.membase = (void __iomem *)&Ser2UTCR0;
 672                sa1100_ports[idx].port.mapbase = _Ser2UTCR0;
 673                sa1100_ports[idx].port.irq     = IRQ_Ser2ICP;
 674                sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
 675                break;
 676
 677        case 3:
 678                sa1100_ports[idx].port.membase = (void __iomem *)&Ser3UTCR0;
 679                sa1100_ports[idx].port.mapbase = _Ser3UTCR0;
 680                sa1100_ports[idx].port.irq     = IRQ_Ser3UART;
 681                sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
 682                break;
 683
 684        default:
 685                printk(KERN_ERR "%s: bad port number %d\n", __FUNCTION__, port);
 686        }
 687}
 688
 689
 690#ifdef CONFIG_SERIAL_SA1100_CONSOLE
 691static void sa1100_console_putchar(struct uart_port *port, int ch)
 692{
 693        struct sa1100_port *sport = (struct sa1100_port *)port;
 694
 695        while (!(UART_GET_UTSR1(sport) & UTSR1_TNF))
 696                barrier();
 697        UART_PUT_CHAR(sport, ch);
 698}
 699
 700/*
 701 * Interrupts are disabled on entering
 702 */
 703static void
 704sa1100_console_write(struct console *co, const char *s, unsigned int count)
 705{
 706        struct sa1100_port *sport = &sa1100_ports[co->index];
 707        unsigned int old_utcr3, status;
 708
 709        /*
 710         *      First, save UTCR3 and then disable interrupts
 711         */
 712        old_utcr3 = UART_GET_UTCR3(sport);
 713        UART_PUT_UTCR3(sport, (old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE)) |
 714                                UTCR3_TXE);
 715
 716        uart_console_write(&sport->port, s, count, sa1100_console_putchar);
 717
 718        /*
 719         *      Finally, wait for transmitter to become empty
 720         *      and restore UTCR3
 721         */
 722        do {
 723                status = UART_GET_UTSR1(sport);
 724        } while (status & UTSR1_TBY);
 725        UART_PUT_UTCR3(sport, old_utcr3);
 726}
 727
 728/*
 729 * If the port was already initialised (eg, by a boot loader),
 730 * try to determine the current setup.
 731 */
 732static void __init
 733sa1100_console_get_options(struct sa1100_port *sport, int *baud,
 734                           int *parity, int *bits)
 735{
 736        unsigned int utcr3;
 737
 738        utcr3 = UART_GET_UTCR3(sport) & (UTCR3_RXE | UTCR3_TXE);
 739        if (utcr3 == (UTCR3_RXE | UTCR3_TXE)) {
 740                /* ok, the port was enabled */
 741                unsigned int utcr0, quot;
 742
 743                utcr0 = UART_GET_UTCR0(sport);
 744
 745                *parity = 'n';
 746                if (utcr0 & UTCR0_PE) {
 747                        if (utcr0 & UTCR0_OES)
 748                                *parity = 'e';
 749                        else
 750                                *parity = 'o';
 751                }
 752
 753                if (utcr0 & UTCR0_DSS)
 754                        *bits = 8;
 755                else
 756                        *bits = 7;
 757
 758                quot = UART_GET_UTCR2(sport) | UART_GET_UTCR1(sport) << 8;
 759                quot &= 0xfff;
 760                *baud = sport->port.uartclk / (16 * (quot + 1));
 761        }
 762}
 763
 764static int __init
 765sa1100_console_setup(struct console *co, char *options)
 766{
 767        struct sa1100_port *sport;
 768        int baud = 9600;
 769        int bits = 8;
 770        int parity = 'n';
 771        int flow = 'n';
 772
 773        /*
 774         * Check whether an invalid uart number has been specified, and
 775         * if so, search for the first available port that does have
 776         * console support.
 777         */
 778        if (co->index == -1 || co->index >= NR_PORTS)
 779                co->index = 0;
 780        sport = &sa1100_ports[co->index];
 781
 782        if (options)
 783                uart_parse_options(options, &baud, &parity, &bits, &flow);
 784        else
 785                sa1100_console_get_options(sport, &baud, &parity, &bits);
 786
 787        return uart_set_options(&sport->port, co, baud, parity, bits, flow);
 788}
 789
 790static struct uart_driver sa1100_reg;
 791static struct console sa1100_console = {
 792        .name           = "ttySA",
 793        .write          = sa1100_console_write,
 794        .device         = uart_console_device,
 795        .setup          = sa1100_console_setup,
 796        .flags          = CON_PRINTBUFFER,
 797        .index          = -1,
 798        .data           = &sa1100_reg,
 799};
 800
 801static int __init sa1100_rs_console_init(void)
 802{
 803        sa1100_init_ports();
 804        register_console(&sa1100_console);
 805        return 0;
 806}
 807console_initcall(sa1100_rs_console_init);
 808
 809#define SA1100_CONSOLE  &sa1100_console
 810#else
 811#define SA1100_CONSOLE  NULL
 812#endif
 813
 814static struct uart_driver sa1100_reg = {
 815        .owner                  = THIS_MODULE,
 816        .driver_name            = "ttySA",
 817        .dev_name               = "ttySA",
 818        .major                  = SERIAL_SA1100_MAJOR,
 819        .minor                  = MINOR_START,
 820        .nr                     = NR_PORTS,
 821        .cons                   = SA1100_CONSOLE,
 822};
 823
 824static int sa1100_serial_suspend(struct platform_device *dev, pm_message_t state)
 825{
 826        struct sa1100_port *sport = platform_get_drvdata(dev);
 827
 828        if (sport)
 829                uart_suspend_port(&sa1100_reg, &sport->port);
 830
 831        return 0;
 832}
 833
 834static int sa1100_serial_resume(struct platform_device *dev)
 835{
 836        struct sa1100_port *sport = platform_get_drvdata(dev);
 837
 838        if (sport)
 839                uart_resume_port(&sa1100_reg, &sport->port);
 840
 841        return 0;
 842}
 843
 844static int sa1100_serial_probe(struct platform_device *dev)
 845{
 846        struct resource *res = dev->resource;
 847        int i;
 848
 849        for (i = 0; i < dev->num_resources; i++, res++)
 850                if (res->flags & IORESOURCE_MEM)
 851                        break;
 852
 853        if (i < dev->num_resources) {
 854                for (i = 0; i < NR_PORTS; i++) {
 855                        if (sa1100_ports[i].port.mapbase != res->start)
 856                                continue;
 857
 858                        sa1100_ports[i].port.dev = &dev->dev;
 859                        uart_add_one_port(&sa1100_reg, &sa1100_ports[i].port);
 860                        platform_set_drvdata(dev, &sa1100_ports[i]);
 861                        break;
 862                }
 863        }
 864
 865        return 0;
 866}
 867
 868static int sa1100_serial_remove(struct platform_device *pdev)
 869{
 870        struct sa1100_port *sport = platform_get_drvdata(pdev);
 871
 872        platform_set_drvdata(pdev, NULL);
 873
 874        if (sport)
 875                uart_remove_one_port(&sa1100_reg, &sport->port);
 876
 877        return 0;
 878}
 879
 880static struct platform_driver sa11x0_serial_driver = {
 881        .probe          = sa1100_serial_probe,
 882        .remove         = sa1100_serial_remove,
 883        .suspend        = sa1100_serial_suspend,
 884        .resume         = sa1100_serial_resume,
 885        .driver         = {
 886                .name   = "sa11x0-uart",
 887        },
 888};
 889
 890static int __init sa1100_serial_init(void)
 891{
 892        int ret;
 893
 894        printk(KERN_INFO "Serial: SA11x0 driver $Revision: 1.50 $\n");
 895
 896        sa1100_init_ports();
 897
 898        ret = uart_register_driver(&sa1100_reg);
 899        if (ret == 0) {
 900                ret = platform_driver_register(&sa11x0_serial_driver);
 901                if (ret)
 902                        uart_unregister_driver(&sa1100_reg);
 903        }
 904        return ret;
 905}
 906
 907static void __exit sa1100_serial_exit(void)
 908{
 909        platform_driver_unregister(&sa11x0_serial_driver);
 910        uart_unregister_driver(&sa1100_reg);
 911}
 912
 913module_init(sa1100_serial_init);
 914module_exit(sa1100_serial_exit);
 915
 916MODULE_AUTHOR("Deep Blue Solutions Ltd");
 917MODULE_DESCRIPTION("SA1100 generic serial port driver $Revision: 1.50 $");
 918MODULE_LICENSE("GPL");
 919MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_SA1100_MAJOR);
 920