drivers/serial/amba-pl010.c

   1 /*
   2  *  linux/drivers/char/amba.c
   3  *
   4  *  Driver for AMBA serial ports
   5  *
   6  *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
   7  *
   8  *  Copyright 1999 ARM Limited
   9  *  Copyright (C) 2000 Deep Blue Solutions Ltd.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  *
  25  *  $Id: amba.c,v 1.41 2002/07/28 10:03:27 rmk Exp $
  26  *
  27  * This is a generic driver for ARM AMBA-type serial ports.  They
  28  * have a lot of 16550-like features, but are not register compatible.
  29  * Note that although they do have CTS, DCD and DSR inputs, they do
  30  * not have an RI input, nor do they have DTR or RTS outputs.  If
  31  * required, these have to be supplied via some other means (eg, GPIO)
  32  * and hooked into this driver.
  33  */
  34
  35 #if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  36 #define SUPPORT_SYSRQ
  37 #endif
  38
  39 #include <linux/module.h>
  40 #include <linux/ioport.h>
  41 #include <linux/init.h>
  42 #include <linux/console.h>
  43 #include <linux/sysrq.h>
  44 #include <linux/device.h>
  45 #include <linux/tty.h>
  46 #include <linux/tty_flip.h>
  47 #include <linux/serial_core.h>
  48 #include <linux/serial.h>
  49 #include <linux/amba/bus.h>
  50 #include <linux/amba/serial.h>
  51 #include <linux/clk.h>
  52
  53 #include <asm/io.h>
  54
  55 #define UART_NR         8
  56
  57 #define SERIAL_AMBA_MAJOR       204
  58 #define SERIAL_AMBA_MINOR       16
  59 #define SERIAL_AMBA_NR          UART_NR
  60
  61 #define AMBA_ISR_PASS_LIMIT     256
  62
  63 #define UART_RX_DATA(s)         (((s) & UART01x_FR_RXFE) == 0)
  64 #define UART_TX_READY(s)        (((s) & UART01x_FR_TXFF) == 0)
  65
  66 #define UART_DUMMY_RSR_RX       256
  67 #define UART_PORT_SIZE          64
  68
  69 /*
  70  * We wrap our port structure around the generic uart_port.
  71  */
  72 struct uart_amba_port {
  73         struct uart_port        port;
  74         struct clk              *clk;
  75         struct amba_device      *dev;
  76         struct amba_pl010_data  *data;
  77         unsigned int            old_status;
  78 };
  79
  80 static void pl010_stop_tx(struct uart_port *port)
  81 {
  82         struct uart_amba_port *uap = (struct uart_amba_port *)port;
  83         unsigned int cr;
  84
  85         cr = readb(uap->port.membase + UART010_CR);
  86         cr &= ~UART010_CR_TIE;
  87         writel(cr, uap->port.membase + UART010_CR);
  88 }
  89
  90 static void pl010_start_tx(struct uart_port *port)
  91 {
  92         struct uart_amba_port *uap = (struct uart_amba_port *)port;
  93         unsigned int cr;
  94
  95         cr = readb(uap->port.membase + UART010_CR);
  96         cr |= UART010_CR_TIE;
  97         writel(cr, uap->port.membase + UART010_CR);
  98 }
  99
 100 static void pl010_stop_rx(struct uart_port *port)
 101 {
 102         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 103         unsigned int cr;
 104
 105         cr = readb(uap->port.membase + UART010_CR);
 106         cr &= ~(UART010_CR_RIE | UART010_CR_RTIE);
 107         writel(cr, uap->port.membase + UART010_CR);
 108 }
 109
 110 static void pl010_enable_ms(struct uart_port *port)
 111 {
 112         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 113         unsigned int cr;
 114
 115         cr = readb(uap->port.membase + UART010_CR);
 116         cr |= UART010_CR_MSIE;
 117         writel(cr, uap->port.membase + UART010_CR);
 118 }
 119
 120 static void pl010_rx_chars(struct uart_amba_port *uap)
 121 {
 122         struct tty_struct *tty = uap->port.info->tty;
 123         unsigned int status, ch, flag, rsr, max_count = 256;
 124
 125         status = readb(uap->port.membase + UART01x_FR);
 126         while (UART_RX_DATA(status) && max_count--) {
 127                 ch = readb(uap->port.membase + UART01x_DR);
 128                 flag = TTY_NORMAL;
 129
 130                 uap->port.icount.rx++;
 131
 132                 /*
 133                  * Note that the error handling code is
 134                  * out of the main execution path
 135                  */
 136                 rsr = readb(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
 137                 if (unlikely(rsr & UART01x_RSR_ANY)) {
 138                         writel(0, uap->port.membase + UART01x_ECR);
 139
 140                         if (rsr & UART01x_RSR_BE) {
 141                                 rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
 142                                 uap->port.icount.brk++;
 143                                 if (uart_handle_break(&uap->port))
 144                                         goto ignore_char;
 145                         } else if (rsr & UART01x_RSR_PE)
 146                                 uap->port.icount.parity++;
 147                         else if (rsr & UART01x_RSR_FE)
 148                                 uap->port.icount.frame++;
 149                         if (rsr & UART01x_RSR_OE)
 150                                 uap->port.icount.overrun++;
 151
 152                         rsr &= uap->port.read_status_mask;
 153
 154                         if (rsr & UART01x_RSR_BE)
 155                                 flag = TTY_BREAK;
 156                         else if (rsr & UART01x_RSR_PE)
 157                                 flag = TTY_PARITY;
 158                         else if (rsr & UART01x_RSR_FE)
 159                                 flag = TTY_FRAME;
 160                 }
 161
 162                 if (uart_handle_sysrq_char(&uap->port, ch))
 163                         goto ignore_char;
 164
 165                 uart_insert_char(&uap->port, rsr, UART01x_RSR_OE, ch, flag);
 166
 167         ignore_char:
 168                 status = readb(uap->port.membase + UART01x_FR);
 169         }
 170         spin_unlock(&port->lock);
 171         tty_flip_buffer_push(tty);
 172         spin_lock(&port->lock);
 173 }
 174
 175 static void pl010_tx_chars(struct uart_amba_port *uap)
 176 {
 177         struct circ_buf *xmit = &uap->port.info->xmit;
 178         int count;
 179
 180         if (uap->port.x_char) {
 181                 writel(uap->port.x_char, uap->port.membase + UART01x_DR);
 182                 uap->port.icount.tx++;
 183                 uap->port.x_char = 0;
 184                 return;
 185         }
 186         if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
 187                 pl010_stop_tx(&uap->port);
 188                 return;
 189         }
 190
 191         count = uap->port.fifosize >> 1;
 192         do {
 193                 writel(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR);
 194                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 195                 uap->port.icount.tx++;
 196                 if (uart_circ_empty(xmit))
 197                         break;
 198         } while (--count > 0);
 199
 200         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 201                 uart_write_wakeup(&uap->port);
 202
 203         if (uart_circ_empty(xmit))
 204                 pl010_stop_tx(&uap->port);
 205 }
 206
 207 static void pl010_modem_status(struct uart_amba_port *uap)
 208 {
 209         unsigned int status, delta;
 210
 211         writel(0, uap->port.membase + UART010_ICR);
 212
 213         status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
 214
 215         delta = status ^ uap->old_status;
 216         uap->old_status = status;
 217
 218         if (!delta)
 219                 return;
 220
 221         if (delta & UART01x_FR_DCD)
 222                 uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
 223
 224         if (delta & UART01x_FR_DSR)
 225                 uap->port.icount.dsr++;
 226
 227         if (delta & UART01x_FR_CTS)
 228                 uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
 229
 230         wake_up_interruptible(&uap->port.info->delta_msr_wait);
 231 }
 232
 233 static irqreturn_t pl010_int(int irq, void *dev_id)
 234 {
 235         struct uart_amba_port *uap = dev_id;
 236         unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
 237         int handled = 0;
 238
 239         spin_lock(&uap->port.lock);
 240
 241         status = readb(uap->port.membase + UART010_IIR);
 242         if (status) {
 243                 do {
 244                         if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
 245                                 pl010_rx_chars(uap);
 246                         if (status & UART010_IIR_MIS)
 247                                 pl010_modem_status(uap);
 248                         if (status & UART010_IIR_TIS)
 249                                 pl010_tx_chars(uap);
 250
 251                         if (pass_counter-- == 0)
 252                                 break;
 253
 254                         status = readb(uap->port.membase + UART010_IIR);
 255                 } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
 256                                    UART010_IIR_TIS));
 257                 handled = 1;
 258         }
 259
 260         spin_unlock(&uap->port.lock);
 261
 262         return IRQ_RETVAL(handled);
 263 }
 264
 265 static unsigned int pl010_tx_empty(struct uart_port *port)
 266 {
 267         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 268         unsigned int status = readb(uap->port.membase + UART01x_FR);
 269         return status & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
 270 }
 271
 272 static unsigned int pl010_get_mctrl(struct uart_port *port)
 273 {
 274         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 275         unsigned int result = 0;
 276         unsigned int status;
 277
 278         status = readb(uap->port.membase + UART01x_FR);
 279         if (status & UART01x_FR_DCD)
 280                 result |= TIOCM_CAR;
 281         if (status & UART01x_FR_DSR)
 282                 result |= TIOCM_DSR;
 283         if (status & UART01x_FR_CTS)
 284                 result |= TIOCM_CTS;
 285
 286         return result;
 287 }
 288
 289 static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
 290 {
 291         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 292
 293         if (uap->data)
 294                 uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl);
 295 }
 296
 297 static void pl010_break_ctl(struct uart_port *port, int break_state)
 298 {
 299         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 300         unsigned long flags;
 301         unsigned int lcr_h;
 302
 303         spin_lock_irqsave(&uap->port.lock, flags);
 304         lcr_h = readb(uap->port.membase + UART010_LCRH);
 305         if (break_state == -1)
 306                 lcr_h |= UART01x_LCRH_BRK;
 307         else
 308                 lcr_h &= ~UART01x_LCRH_BRK;
 309         writel(lcr_h, uap->port.membase + UART010_LCRH);
 310         spin_unlock_irqrestore(&uap->port.lock, flags);
 311 }
 312
 313 static int pl010_startup(struct uart_port *port)
 314 {
 315         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 316         int retval;
 317
 318         /*
 319          * Try to enable the clock producer.
 320          */
 321         retval = clk_enable(uap->clk);
 322         if (retval)
 323                 goto out;
 324
 325         uap->port.uartclk = clk_get_rate(uap->clk);
 326
 327         /*
 328          * Allocate the IRQ
 329          */
 330         retval = request_irq(uap->port.irq, pl010_int, 0, "uart-pl010", uap);
 331         if (retval)
 332                 goto clk_dis;
 333
 334         /*
 335          * initialise the old status of the modem signals
 336          */
 337         uap->old_status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
 338
 339         /*
 340          * Finally, enable interrupts
 341          */
 342         writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE,
 343                uap->port.membase + UART010_CR);
 344
 345         return 0;
 346
 347  clk_dis:
 348         clk_disable(uap->clk);
 349  out:
 350         return retval;
 351 }
 352
 353 static void pl010_shutdown(struct uart_port *port)
 354 {
 355         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 356
 357         /*
 358          * Free the interrupt
 359          */
 360         free_irq(uap->port.irq, uap);
 361
 362         /*
 363          * disable all interrupts, disable the port
 364          */
 365         writel(0, uap->port.membase + UART010_CR);
 366
 367         /* disable break condition and fifos */
 368         writel(readb(uap->port.membase + UART010_LCRH) &
 369                 ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN),
 370                uap->port.membase + UART010_LCRH);
 371
 372         /*
 373          * Shut down the clock producer
 374          */
 375         clk_disable(uap->clk);
 376 }
 377
 378 static void
 379 pl010_set_termios(struct uart_port *port, struct ktermios *termios,
 380                      struct ktermios *old)
 381 {
 382         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 383         unsigned int lcr_h, old_cr;
 384         unsigned long flags;
 385         unsigned int baud, quot;
 386
 387         /*
 388          * Ask the core to calculate the divisor for us.
 389          */
 390         baud = uart_get_baud_rate(port, termios, old, 0, uap->port.uartclk/16);
 391         quot = uart_get_divisor(port, baud);
 392
 393         switch (termios->c_cflag & CSIZE) {
 394         case CS5:
 395                 lcr_h = UART01x_LCRH_WLEN_5;
 396                 break;
 397         case CS6:
 398                 lcr_h = UART01x_LCRH_WLEN_6;
 399                 break;
 400         case CS7:
 401                 lcr_h = UART01x_LCRH_WLEN_7;
 402                 break;
 403         default: // CS8
 404                 lcr_h = UART01x_LCRH_WLEN_8;
 405                 break;
 406         }
 407         if (termios->c_cflag & CSTOPB)
 408                 lcr_h |= UART01x_LCRH_STP2;
 409         if (termios->c_cflag & PARENB) {
 410                 lcr_h |= UART01x_LCRH_PEN;
 411                 if (!(termios->c_cflag & PARODD))
 412                         lcr_h |= UART01x_LCRH_EPS;
 413         }
 414         if (uap->port.fifosize > 1)
 415                 lcr_h |= UART01x_LCRH_FEN;
 416
 417         spin_lock_irqsave(&uap->port.lock, flags);
 418
 419         /*
 420          * Update the per-port timeout.
 421          */
 422         uart_update_timeout(port, termios->c_cflag, baud);
 423
 424         uap->port.read_status_mask = UART01x_RSR_OE;
 425         if (termios->c_iflag & INPCK)
 426                 uap->port.read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 427         if (termios->c_iflag & (BRKINT | PARMRK))
 428                 uap->port.read_status_mask |= UART01x_RSR_BE;
 429
 430         /*
 431          * Characters to ignore
 432          */
 433         uap->port.ignore_status_mask = 0;
 434         if (termios->c_iflag & IGNPAR)
 435                 uap->port.ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 436         if (termios->c_iflag & IGNBRK) {
 437                 uap->port.ignore_status_mask |= UART01x_RSR_BE;
 438                 /*
 439                  * If we're ignoring parity and break indicators,
 440                  * ignore overruns too (for real raw support).
 441                  */
 442                 if (termios->c_iflag & IGNPAR)
 443                         uap->port.ignore_status_mask |= UART01x_RSR_OE;
 444         }
 445
 446         /*
 447          * Ignore all characters if CREAD is not set.
 448          */
 449         if ((termios->c_cflag & CREAD) == 0)
 450                 uap->port.ignore_status_mask |= UART_DUMMY_RSR_RX;
 451
 452         /* first, disable everything */
 453         old_cr = readb(uap->port.membase + UART010_CR) & ~UART010_CR_MSIE;
 454
 455         if (UART_ENABLE_MS(port, termios->c_cflag))
 456                 old_cr |= UART010_CR_MSIE;
 457
 458         writel(0, uap->port.membase + UART010_CR);
 459
 460         /* Set baud rate */
 461         quot -= 1;
 462         writel((quot & 0xf00) >> 8, uap->port.membase + UART010_LCRM);
 463         writel(quot & 0xff, uap->port.membase + UART010_LCRL);
 464
 465         /*
 466          * ----------v----------v----------v----------v-----
 467          * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
 468          * ----------^----------^----------^----------^-----
 469          */
 470         writel(lcr_h, uap->port.membase + UART010_LCRH);
 471         writel(old_cr, uap->port.membase + UART010_CR);
 472
 473         spin_unlock_irqrestore(&uap->port.lock, flags);
 474 }
 475
 476 static const char *pl010_type(struct uart_port *port)
 477 {
 478         return port->type == PORT_AMBA ? "AMBA" : NULL;
 479 }
 480
 481 /*
 482  * Release the memory region(s) being used by 'port'
 483  */
 484 static void pl010_release_port(struct uart_port *port)
 485 {
 486         release_mem_region(port->mapbase, UART_PORT_SIZE);
 487 }
 488
 489 /*
 490  * Request the memory region(s) being used by 'port'
 491  */
 492 static int pl010_request_port(struct uart_port *port)
 493 {
 494         return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
 495                         != NULL ? 0 : -EBUSY;
 496 }
 497
 498 /*
 499  * Configure/autoconfigure the port.
 500  */
 501 static void pl010_config_port(struct uart_port *port, int flags)
 502 {
 503         if (flags & UART_CONFIG_TYPE) {
 504                 port->type = PORT_AMBA;
 505                 pl010_request_port(port);
 506         }
 507 }
 508
 509 /*
 510  * verify the new serial_struct (for TIOCSSERIAL).
 511  */
 512 static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
 513 {
 514         int ret = 0;
 515         if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
 516                 ret = -EINVAL;
 517         if (ser->irq < 0 || ser->irq >= NR_IRQS)
 518                 ret = -EINVAL;
 519         if (ser->baud_base < 9600)
 520                 ret = -EINVAL;
 521         return ret;
 522 }
 523
 524 static struct uart_ops amba_pl010_pops = {
 525         .tx_empty       = pl010_tx_empty,
 526         .set_mctrl      = pl010_set_mctrl,
 527         .get_mctrl      = pl010_get_mctrl,
 528         .stop_tx        = pl010_stop_tx,
 529         .start_tx       = pl010_start_tx,
 530         .stop_rx        = pl010_stop_rx,
 531         .enable_ms      = pl010_enable_ms,
 532         .break_ctl      = pl010_break_ctl,
 533         .startup        = pl010_startup,
 534         .shutdown       = pl010_shutdown,
 535         .set_termios    = pl010_set_termios,
 536         .type           = pl010_type,
 537         .release_port   = pl010_release_port,
 538         .request_port   = pl010_request_port,
 539         .config_port    = pl010_config_port,
 540         .verify_port    = pl010_verify_port,
 541 };
 542
 543 static struct uart_amba_port *amba_ports[UART_NR];
 544
 545 #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
 546
 547 static void pl010_console_putchar(struct uart_port *port, int ch)
 548 {
 549         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 550         unsigned int status;
 551
 552         do {
 553                 status = readb(uap->port.membase + UART01x_FR);
 554                 barrier();
 555         } while (!UART_TX_READY(status));
 556         writel(ch, uap->port.membase + UART01x_DR);
 557 }
 558
 559 static void
 560 pl010_console_write(struct console *co, const char *s, unsigned int count)
 561 {
 562         struct uart_amba_port *uap = amba_ports[co->index];
 563         unsigned int status, old_cr;
 564
 565         clk_enable(uap->clk);
 566
 567         /*
 568          *      First save the CR then disable the interrupts
 569          */
 570         old_cr = readb(uap->port.membase + UART010_CR);
 571         writel(UART01x_CR_UARTEN, uap->port.membase + UART010_CR);
 572
 573         uart_console_write(&uap->port, s, count, pl010_console_putchar);
 574
 575         /*
 576          *      Finally, wait for transmitter to become empty
 577          *      and restore the TCR
 578          */
 579         do {
 580                 status = readb(uap->port.membase + UART01x_FR);
 581                 barrier();
 582         } while (status & UART01x_FR_BUSY);
 583         writel(old_cr, uap->port.membase + UART010_CR);
 584
 585         clk_disable(uap->clk);
 586 }
 587
 588 static void __init
 589 pl010_console_get_options(struct uart_amba_port *uap, int *baud,
 590                              int *parity, int *bits)
 591 {
 592         if (readb(uap->port.membase + UART010_CR) & UART01x_CR_UARTEN) {
 593                 unsigned int lcr_h, quot;
 594                 lcr_h = readb(uap->port.membase + UART010_LCRH);
 595
 596                 *parity = 'n';
 597                 if (lcr_h & UART01x_LCRH_PEN) {
 598                         if (lcr_h & UART01x_LCRH_EPS)
 599                                 *parity = 'e';
 600                         else
 601                                 *parity = 'o';
 602                 }
 603
 604                 if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
 605                         *bits = 7;
 606                 else
 607                         *bits = 8;
 608
 609                 quot = readb(uap->port.membase + UART010_LCRL) |
 610                        readb(uap->port.membase + UART010_LCRM) << 8;
 611                 *baud = uap->port.uartclk / (16 * (quot + 1));
 612         }
 613 }
 614
 615 static int __init pl010_console_setup(struct console *co, char *options)
 616 {
 617         struct uart_amba_port *uap;
 618         int baud = 38400;
 619         int bits = 8;
 620         int parity = 'n';
 621         int flow = 'n';
 622
 623         /*
 624          * Check whether an invalid uart number has been specified, and
 625          * if so, search for the first available port that does have
 626          * console support.
 627          */
 628         if (co->index >= UART_NR)
 629                 co->index = 0;
 630         uap = amba_ports[co->index];
 631         if (!uap)
 632                 return -ENODEV;
 633
 634         uap->port.uartclk = clk_get_rate(uap->clk);
 635
 636         if (options)
 637                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 638         else
 639                 pl010_console_get_options(uap, &baud, &parity, &bits);
 640
 641         return uart_set_options(&uap->port, co, baud, parity, bits, flow);
 642 }
 643
 644 static struct uart_driver amba_reg;
 645 static struct console amba_console = {
 646         .name           = "ttyAM",
 647         .write          = pl010_console_write,
 648         .device         = uart_console_device,
 649         .setup          = pl010_console_setup,
 650         .flags          = CON_PRINTBUFFER,
 651         .index          = -1,
 652         .data           = &amba_reg,
 653 };
 654
 655 #define AMBA_CONSOLE    &amba_console
 656 #else
 657 #define AMBA_CONSOLE    NULL
 658 #endif
 659
 660 static struct uart_driver amba_reg = {
 661         .owner                  = THIS_MODULE,
 662         .driver_name            = "ttyAM",
 663         .dev_name               = "ttyAM",
 664         .major                  = SERIAL_AMBA_MAJOR,
 665         .minor                  = SERIAL_AMBA_MINOR,
 666         .nr                     = UART_NR,
 667         .cons                   = AMBA_CONSOLE,
 668 };
 669
 670 static int pl010_probe(struct amba_device *dev, void *id)
 671 {
 672         struct uart_amba_port *uap;
 673         void __iomem *base;
 674         int i, ret;
 675
 676         for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
 677                 if (amba_ports[i] == NULL)
 678                         break;
 679
 680         if (i == ARRAY_SIZE(amba_ports)) {
 681                 ret = -EBUSY;
 682                 goto out;
 683         }
 684
 685         uap = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
 686         if (!uap) {
 687                 ret = -ENOMEM;
 688                 goto out;
 689         }
 690
 691         base = ioremap(dev->res.start, PAGE_SIZE);
 692         if (!base) {
 693                 ret = -ENOMEM;
 694                 goto free;
 695         }
 696
 697         uap->clk = clk_get(&dev->dev, "UARTCLK");
 698         if (IS_ERR(uap->clk)) {
 699                 ret = PTR_ERR(uap->clk);
 700                 goto unmap;
 701         }
 702
 703         uap->port.dev = &dev->dev;
 704         uap->port.mapbase = dev->res.start;
 705         uap->port.membase = base;
 706         uap->port.iotype = UPIO_MEM;
 707         uap->port.irq = dev->irq[0];
 708         uap->port.fifosize = 16;
 709         uap->port.ops = &amba_pl010_pops;
 710         uap->port.flags = UPF_BOOT_AUTOCONF;
 711         uap->port.line = i;
 712         uap->dev = dev;
 713         uap->data = dev->dev.platform_data;
 714
 715         amba_ports[i] = uap;
 716
 717         amba_set_drvdata(dev, uap);
 718         ret = uart_add_one_port(&amba_reg, &uap->port);
 719         if (ret) {
 720                 amba_set_drvdata(dev, NULL);
 721                 amba_ports[i] = NULL;
 722                 clk_put(uap->clk);
 723  unmap:
 724                 iounmap(base);
 725  free:
 726                 kfree(uap);
 727         }
 728  out:
 729         return ret;
 730 }
 731
 732 static int pl010_remove(struct amba_device *dev)
 733 {
 734         struct uart_amba_port *uap = amba_get_drvdata(dev);
 735         int i;
 736
 737         amba_set_drvdata(dev, NULL);
 738
 739         uart_remove_one_port(&amba_reg, &uap->port);
 740
 741         for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
 742                 if (amba_ports[i] == uap)
 743                         amba_ports[i] = NULL;
 744
 745         iounmap(uap->port.membase);
 746         clk_put(uap->clk);
 747         kfree(uap);
 748         return 0;
 749 }
 750
 751 static int pl010_suspend(struct amba_device *dev, pm_message_t state)
 752 {
 753         struct uart_amba_port *uap = amba_get_drvdata(dev);
 754
 755         if (uap)
 756                 uart_suspend_port(&amba_reg, &uap->port);
 757
 758         return 0;
 759 }
 760
 761 static int pl010_resume(struct amba_device *dev)
 762 {
 763         struct uart_amba_port *uap = amba_get_drvdata(dev);
 764
 765         if (uap)
 766                 uart_resume_port(&amba_reg, &uap->port);
 767
 768         return 0;
 769 }
 770
 771 static struct amba_id pl010_ids[] __initdata = {
 772         {
 773                 .id     = 0x00041010,
 774                 .mask   = 0x000fffff,
 775         },
 776         { 0, 0 },
 777 };
 778
 779 static struct amba_driver pl010_driver = {
 780         .drv = {
 781                 .name   = "uart-pl010",
 782         },
 783         .id_table       = pl010_ids,
 784         .probe          = pl010_probe,
 785         .remove         = pl010_remove,
 786         .suspend        = pl010_suspend,
 787         .resume         = pl010_resume,
 788 };
 789
 790 static int __init pl010_init(void)
 791 {
 792         int ret;
 793
 794         printk(KERN_INFO "Serial: AMBA driver $Revision: 1.41 $\n");
 795
 796         ret = uart_register_driver(&amba_reg);
 797         if (ret == 0) {
 798                 ret = amba_driver_register(&pl010_driver);
 799                 if (ret)
 800                         uart_unregister_driver(&amba_reg);
 801         }
 802         return ret;
 803 }
 804
 805 static void __exit pl010_exit(void)
 806 {
 807         amba_driver_unregister(&pl010_driver);
 808         uart_unregister_driver(&amba_reg);
 809 }
 810
 811 module_init(pl010_init);
 812 module_exit(pl010_exit);
 813
 814 MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
 815 MODULE_DESCRIPTION("ARM AMBA serial port driver $Revision: 1.41 $");
 816 MODULE_LICENSE("GPL");