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 #include <linux/config.h>
  35
  36 #if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  37 #define SUPPORT_SYSRQ
  38 #endif
  39
  40 #include <linux/module.h>
  41 #include <linux/ioport.h>
  42 #include <linux/init.h>
  43 #include <linux/console.h>
  44 #include <linux/sysrq.h>
  45 #include <linux/device.h>
  46 #include <linux/tty.h>
  47 #include <linux/tty_flip.h>
  48 #include <linux/serial_core.h>
  49 #include <linux/serial.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/irq.h>
  53 #include <asm/hardware.h>
  54 #include <asm/hardware/amba.h>
  55 #include <asm/hardware/amba_serial.h>
  56
  57 #define UART_NR         2
  58
  59 #define SERIAL_AMBA_MAJOR       204
  60 #define SERIAL_AMBA_MINOR       16
  61 #define SERIAL_AMBA_NR          UART_NR
  62
  63 #define AMBA_ISR_PASS_LIMIT     256
  64
  65 /*
  66  * Access macros for the AMBA UARTs
  67  */
  68 #define UART_GET_INT_STATUS(p)  readb((p)->membase + UART010_IIR)
  69 #define UART_PUT_ICR(p, c)      writel((c), (p)->membase + UART010_ICR)
  70 #define UART_GET_FR(p)          readb((p)->membase + UART01x_FR)
  71 #define UART_GET_CHAR(p)        readb((p)->membase + UART01x_DR)
  72 #define UART_PUT_CHAR(p, c)     writel((c), (p)->membase + UART01x_DR)
  73 #define UART_GET_RSR(p)         readb((p)->membase + UART01x_RSR)
  74 #define UART_GET_CR(p)          readb((p)->membase + UART010_CR)
  75 #define UART_PUT_CR(p,c)        writel((c), (p)->membase + UART010_CR)
  76 #define UART_GET_LCRL(p)        readb((p)->membase + UART010_LCRL)
  77 #define UART_PUT_LCRL(p,c)      writel((c), (p)->membase + UART010_LCRL)
  78 #define UART_GET_LCRM(p)        readb((p)->membase + UART010_LCRM)
  79 #define UART_PUT_LCRM(p,c)      writel((c), (p)->membase + UART010_LCRM)
  80 #define UART_GET_LCRH(p)        readb((p)->membase + UART010_LCRH)
  81 #define UART_PUT_LCRH(p,c)      writel((c), (p)->membase + UART010_LCRH)
  82 #define UART_RX_DATA(s)         (((s) & UART01x_FR_RXFE) == 0)
  83 #define UART_TX_READY(s)        (((s) & UART01x_FR_TXFF) == 0)
  84 #define UART_TX_EMPTY(p)        ((UART_GET_FR(p) & UART01x_FR_TMSK) == 0)
  85
  86 #define UART_DUMMY_RSR_RX       /*256*/0
  87 #define UART_PORT_SIZE          64
  88
  89 /*
  90  * On the Integrator platform, the port RTS and DTR are provided by
  91  * bits in the following SC_CTRLS register bits:
  92  *        RTS  DTR
  93  *  UART0  7    6
  94  *  UART1  5    4
  95  */
  96 #define SC_CTRLC        (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLC_OFFSET)
  97 #define SC_CTRLS        (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLS_OFFSET)
  98
  99 /*
 100  * We wrap our port structure around the generic uart_port.
 101  */
 102 struct uart_amba_port {
 103         struct uart_port        port;
 104         unsigned int            dtr_mask;
 105         unsigned int            rts_mask;
 106         unsigned int            old_status;
 107 };
 108
 109 static void pl010_stop_tx(struct uart_port *port)
 110 {
 111         unsigned int cr;
 112
 113         cr = UART_GET_CR(port);
 114         cr &= ~UART010_CR_TIE;
 115         UART_PUT_CR(port, cr);
 116 }
 117
 118 static void pl010_start_tx(struct uart_port *port)
 119 {
 120         unsigned int cr;
 121
 122         cr = UART_GET_CR(port);
 123         cr |= UART010_CR_TIE;
 124         UART_PUT_CR(port, cr);
 125 }
 126
 127 static void pl010_stop_rx(struct uart_port *port)
 128 {
 129         unsigned int cr;
 130
 131         cr = UART_GET_CR(port);
 132         cr &= ~(UART010_CR_RIE | UART010_CR_RTIE);
 133         UART_PUT_CR(port, cr);
 134 }
 135
 136 static void pl010_enable_ms(struct uart_port *port)
 137 {
 138         unsigned int cr;
 139
 140         cr = UART_GET_CR(port);
 141         cr |= UART010_CR_MSIE;
 142         UART_PUT_CR(port, cr);
 143 }
 144
 145 static void
 146 #ifdef SUPPORT_SYSRQ
 147 pl010_rx_chars(struct uart_port *port, struct pt_regs *regs)
 148 #else
 149 pl010_rx_chars(struct uart_port *port)
 150 #endif
 151 {
 152         struct tty_struct *tty = port->info->tty;
 153         unsigned int status, ch, flag, rsr, max_count = 256;
 154
 155         status = UART_GET_FR(port);
 156         while (UART_RX_DATA(status) && max_count--) {
 157                 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
 158                         if (tty->low_latency)
 159                                 tty_flip_buffer_push(tty);
 160                         /*
 161                          * If this failed then we will throw away the
 162                          * bytes but must do so to clear interrupts.
 163                          */
 164                 }
 165
 166                 ch = UART_GET_CHAR(port);
 167                 flag = TTY_NORMAL;
 168
 169                 port->icount.rx++;
 170
 171                 /*
 172                  * Note that the error handling code is
 173                  * out of the main execution path
 174                  */
 175                 rsr = UART_GET_RSR(port) | UART_DUMMY_RSR_RX;
 176                 if (unlikely(rsr & UART01x_RSR_ANY)) {
 177                         if (rsr & UART01x_RSR_BE) {
 178                                 rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
 179                                 port->icount.brk++;
 180                                 if (uart_handle_break(port))
 181                                         goto ignore_char;
 182                         } else if (rsr & UART01x_RSR_PE)
 183                                 port->icount.parity++;
 184                         else if (rsr & UART01x_RSR_FE)
 185                                 port->icount.frame++;
 186                         if (rsr & UART01x_RSR_OE)
 187                                 port->icount.overrun++;
 188
 189                         rsr &= port->read_status_mask;
 190
 191                         if (rsr & UART01x_RSR_BE)
 192                                 flag = TTY_BREAK;
 193                         else if (rsr & UART01x_RSR_PE)
 194                                 flag = TTY_PARITY;
 195                         else if (rsr & UART01x_RSR_FE)
 196                                 flag = TTY_FRAME;
 197                 }
 198
 199                 if (uart_handle_sysrq_char(port, ch, regs))
 200                         goto ignore_char;
 201
 202                 uart_insert_char(port, rsr, UART01x_RSR_OE, ch, flag);
 203
 204         ignore_char:
 205                 status = UART_GET_FR(port);
 206         }
 207         tty_flip_buffer_push(tty);
 208         return;
 209 }
 210
 211 static void pl010_tx_chars(struct uart_port *port)
 212 {
 213         struct circ_buf *xmit = &port->info->xmit;
 214         int count;
 215
 216         if (port->x_char) {
 217                 UART_PUT_CHAR(port, port->x_char);
 218                 port->icount.tx++;
 219                 port->x_char = 0;
 220                 return;
 221         }
 222         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 223                 pl010_stop_tx(port);
 224                 return;
 225         }
 226
 227         count = port->fifosize >> 1;
 228         do {
 229                 UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
 230                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 231                 port->icount.tx++;
 232                 if (uart_circ_empty(xmit))
 233                         break;
 234         } while (--count > 0);
 235
 236         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 237                 uart_write_wakeup(port);
 238
 239         if (uart_circ_empty(xmit))
 240                 pl010_stop_tx(port);
 241 }
 242
 243 static void pl010_modem_status(struct uart_port *port)
 244 {
 245         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 246         unsigned int status, delta;
 247
 248         UART_PUT_ICR(&uap->port, 0);
 249
 250         status = UART_GET_FR(&uap->port) & UART01x_FR_MODEM_ANY;
 251
 252         delta = status ^ uap->old_status;
 253         uap->old_status = status;
 254
 255         if (!delta)
 256                 return;
 257
 258         if (delta & UART01x_FR_DCD)
 259                 uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
 260
 261         if (delta & UART01x_FR_DSR)
 262                 uap->port.icount.dsr++;
 263
 264         if (delta & UART01x_FR_CTS)
 265                 uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
 266
 267         wake_up_interruptible(&uap->port.info->delta_msr_wait);
 268 }
 269
 270 static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs)
 271 {
 272         struct uart_port *port = dev_id;
 273         unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
 274         int handled = 0;
 275
 276         spin_lock(&port->lock);
 277
 278         status = UART_GET_INT_STATUS(port);
 279         if (status) {
 280                 do {
 281                         if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
 282 #ifdef SUPPORT_SYSRQ
 283                                 pl010_rx_chars(port, regs);
 284 #else
 285                                 pl010_rx_chars(port);
 286 #endif
 287                         if (status & UART010_IIR_MIS)
 288                                 pl010_modem_status(port);
 289                         if (status & UART010_IIR_TIS)
 290                                 pl010_tx_chars(port);
 291
 292                         if (pass_counter-- == 0)
 293                                 break;
 294
 295                         status = UART_GET_INT_STATUS(port);
 296                 } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
 297                                    UART010_IIR_TIS));
 298                 handled = 1;
 299         }
 300
 301         spin_unlock(&port->lock);
 302
 303         return IRQ_RETVAL(handled);
 304 }
 305
 306 static unsigned int pl010_tx_empty(struct uart_port *port)
 307 {
 308         return UART_GET_FR(port) & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
 309 }
 310
 311 static unsigned int pl010_get_mctrl(struct uart_port *port)
 312 {
 313         unsigned int result = 0;
 314         unsigned int status;
 315
 316         status = UART_GET_FR(port);
 317         if (status & UART01x_FR_DCD)
 318                 result |= TIOCM_CAR;
 319         if (status & UART01x_FR_DSR)
 320                 result |= TIOCM_DSR;
 321         if (status & UART01x_FR_CTS)
 322                 result |= TIOCM_CTS;
 323
 324         return result;
 325 }
 326
 327 static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
 328 {
 329         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 330         unsigned int ctrls = 0, ctrlc = 0;
 331
 332         if (mctrl & TIOCM_RTS)
 333                 ctrlc |= uap->rts_mask;
 334         else
 335                 ctrls |= uap->rts_mask;
 336
 337         if (mctrl & TIOCM_DTR)
 338                 ctrlc |= uap->dtr_mask;
 339         else
 340                 ctrls |= uap->dtr_mask;
 341
 342         __raw_writel(ctrls, SC_CTRLS);
 343         __raw_writel(ctrlc, SC_CTRLC);
 344 }
 345
 346 static void pl010_break_ctl(struct uart_port *port, int break_state)
 347 {
 348         unsigned long flags;
 349         unsigned int lcr_h;
 350
 351         spin_lock_irqsave(&port->lock, flags);
 352         lcr_h = UART_GET_LCRH(port);
 353         if (break_state == -1)
 354                 lcr_h |= UART01x_LCRH_BRK;
 355         else
 356                 lcr_h &= ~UART01x_LCRH_BRK;
 357         UART_PUT_LCRH(port, lcr_h);
 358         spin_unlock_irqrestore(&port->lock, flags);
 359 }
 360
 361 static int pl010_startup(struct uart_port *port)
 362 {
 363         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 364         int retval;
 365
 366         /*
 367          * Allocate the IRQ
 368          */
 369         retval = request_irq(port->irq, pl010_int, 0, "uart-pl010", port);
 370         if (retval)
 371                 return retval;
 372
 373         /*
 374          * initialise the old status of the modem signals
 375          */
 376         uap->old_status = UART_GET_FR(port) & UART01x_FR_MODEM_ANY;
 377
 378         /*
 379          * Finally, enable interrupts
 380          */
 381         UART_PUT_CR(port, UART01x_CR_UARTEN | UART010_CR_RIE |
 382                           UART010_CR_RTIE);
 383
 384         return 0;
 385 }
 386
 387 static void pl010_shutdown(struct uart_port *port)
 388 {
 389         /*
 390          * Free the interrupt
 391          */
 392         free_irq(port->irq, port);
 393
 394         /*
 395          * disable all interrupts, disable the port
 396          */
 397         UART_PUT_CR(port, 0);
 398
 399         /* disable break condition and fifos */
 400         UART_PUT_LCRH(port, UART_GET_LCRH(port) &
 401                 ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN));
 402 }
 403
 404 static void
 405 pl010_set_termios(struct uart_port *port, struct termios *termios,
 406                      struct termios *old)
 407 {
 408         unsigned int lcr_h, old_cr;
 409         unsigned long flags;
 410         unsigned int baud, quot;
 411
 412         /*
 413          * Ask the core to calculate the divisor for us.
 414          */
 415         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 416         quot = uart_get_divisor(port, baud);
 417
 418         switch (termios->c_cflag & CSIZE) {
 419         case CS5:
 420                 lcr_h = UART01x_LCRH_WLEN_5;
 421                 break;
 422         case CS6:
 423                 lcr_h = UART01x_LCRH_WLEN_6;
 424                 break;
 425         case CS7:
 426                 lcr_h = UART01x_LCRH_WLEN_7;
 427                 break;
 428         default: // CS8
 429                 lcr_h = UART01x_LCRH_WLEN_8;
 430                 break;
 431         }
 432         if (termios->c_cflag & CSTOPB)
 433                 lcr_h |= UART01x_LCRH_STP2;
 434         if (termios->c_cflag & PARENB) {
 435                 lcr_h |= UART01x_LCRH_PEN;
 436                 if (!(termios->c_cflag & PARODD))
 437                         lcr_h |= UART01x_LCRH_EPS;
 438         }
 439         if (port->fifosize > 1)
 440                 lcr_h |= UART01x_LCRH_FEN;
 441
 442         spin_lock_irqsave(&port->lock, flags);
 443
 444         /*
 445          * Update the per-port timeout.
 446          */
 447         uart_update_timeout(port, termios->c_cflag, baud);
 448
 449         port->read_status_mask = UART01x_RSR_OE;
 450         if (termios->c_iflag & INPCK)
 451                 port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 452         if (termios->c_iflag & (BRKINT | PARMRK))
 453                 port->read_status_mask |= UART01x_RSR_BE;
 454
 455         /*
 456          * Characters to ignore
 457          */
 458         port->ignore_status_mask = 0;
 459         if (termios->c_iflag & IGNPAR)
 460                 port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 461         if (termios->c_iflag & IGNBRK) {
 462                 port->ignore_status_mask |= UART01x_RSR_BE;
 463                 /*
 464                  * If we're ignoring parity and break indicators,
 465                  * ignore overruns too (for real raw support).
 466                  */
 467                 if (termios->c_iflag & IGNPAR)
 468                         port->ignore_status_mask |= UART01x_RSR_OE;
 469         }
 470
 471         /*
 472          * Ignore all characters if CREAD is not set.
 473          */
 474         if ((termios->c_cflag & CREAD) == 0)
 475                 port->ignore_status_mask |= UART_DUMMY_RSR_RX;
 476
 477         /* first, disable everything */
 478         old_cr = UART_GET_CR(port) & ~UART010_CR_MSIE;
 479
 480         if (UART_ENABLE_MS(port, termios->c_cflag))
 481                 old_cr |= UART010_CR_MSIE;
 482
 483         UART_PUT_CR(port, 0);
 484
 485         /* Set baud rate */
 486         quot -= 1;
 487         UART_PUT_LCRM(port, ((quot & 0xf00) >> 8));
 488         UART_PUT_LCRL(port, (quot & 0xff));
 489
 490         /*
 491          * ----------v----------v----------v----------v-----
 492          * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
 493          * ----------^----------^----------^----------^-----
 494          */
 495         UART_PUT_LCRH(port, lcr_h);
 496         UART_PUT_CR(port, old_cr);
 497
 498         spin_unlock_irqrestore(&port->lock, flags);
 499 }
 500
 501 static const char *pl010_type(struct uart_port *port)
 502 {
 503         return port->type == PORT_AMBA ? "AMBA" : NULL;
 504 }
 505
 506 /*
 507  * Release the memory region(s) being used by 'port'
 508  */
 509 static void pl010_release_port(struct uart_port *port)
 510 {
 511         release_mem_region(port->mapbase, UART_PORT_SIZE);
 512 }
 513
 514 /*
 515  * Request the memory region(s) being used by 'port'
 516  */
 517 static int pl010_request_port(struct uart_port *port)
 518 {
 519         return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
 520                         != NULL ? 0 : -EBUSY;
 521 }
 522
 523 /*
 524  * Configure/autoconfigure the port.
 525  */
 526 static void pl010_config_port(struct uart_port *port, int flags)
 527 {
 528         if (flags & UART_CONFIG_TYPE) {
 529                 port->type = PORT_AMBA;
 530                 pl010_request_port(port);
 531         }
 532 }
 533
 534 /*
 535  * verify the new serial_struct (for TIOCSSERIAL).
 536  */
 537 static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
 538 {
 539         int ret = 0;
 540         if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
 541                 ret = -EINVAL;
 542         if (ser->irq < 0 || ser->irq >= NR_IRQS)
 543                 ret = -EINVAL;
 544         if (ser->baud_base < 9600)
 545                 ret = -EINVAL;
 546         return ret;
 547 }
 548
 549 static struct uart_ops amba_pl010_pops = {
 550         .tx_empty       = pl010_tx_empty,
 551         .set_mctrl      = pl010_set_mctrl,
 552         .get_mctrl      = pl010_get_mctrl,
 553         .stop_tx        = pl010_stop_tx,
 554         .start_tx       = pl010_start_tx,
 555         .stop_rx        = pl010_stop_rx,
 556         .enable_ms      = pl010_enable_ms,
 557         .break_ctl      = pl010_break_ctl,
 558         .startup        = pl010_startup,
 559         .shutdown       = pl010_shutdown,
 560         .set_termios    = pl010_set_termios,
 561         .type           = pl010_type,
 562         .release_port   = pl010_release_port,
 563         .request_port   = pl010_request_port,
 564         .config_port    = pl010_config_port,
 565         .verify_port    = pl010_verify_port,
 566 };
 567
 568 static struct uart_amba_port amba_ports[UART_NR] = {
 569         {
 570                 .port   = {
 571                         .membase        = (void *)IO_ADDRESS(INTEGRATOR_UART0_BASE),
 572                         .mapbase        = INTEGRATOR_UART0_BASE,
 573                         .iotype         = SERIAL_IO_MEM,
 574                         .irq            = IRQ_UARTINT0,
 575                         .uartclk        = 14745600,
 576                         .fifosize       = 16,
 577                         .ops            = &amba_pl010_pops,
 578                         .flags          = ASYNC_BOOT_AUTOCONF,
 579                         .line           = 0,
 580                 },
 581                 .dtr_mask       = 1 << 5,
 582                 .rts_mask       = 1 << 4,
 583         },
 584         {
 585                 .port   = {
 586                         .membase        = (void *)IO_ADDRESS(INTEGRATOR_UART1_BASE),
 587                         .mapbase        = INTEGRATOR_UART1_BASE,
 588                         .iotype         = SERIAL_IO_MEM,
 589                         .irq            = IRQ_UARTINT1,
 590                         .uartclk        = 14745600,
 591                         .fifosize       = 16,
 592                         .ops            = &amba_pl010_pops,
 593                         .flags          = ASYNC_BOOT_AUTOCONF,
 594                         .line           = 1,
 595                 },
 596                 .dtr_mask       = 1 << 7,
 597                 .rts_mask       = 1 << 6,
 598         }
 599 };
 600
 601 #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
 602
 603 static void
 604 pl010_console_write(struct console *co, const char *s, unsigned int count)
 605 {
 606         struct uart_port *port = &amba_ports[co->index].port;
 607         unsigned int status, old_cr;
 608         int i;
 609
 610         /*
 611          *      First save the CR then disable the interrupts
 612          */
 613         old_cr = UART_GET_CR(port);
 614         UART_PUT_CR(port, UART01x_CR_UARTEN);
 615
 616         /*
 617          *      Now, do each character
 618          */
 619         for (i = 0; i < count; i++) {
 620                 do {
 621                         status = UART_GET_FR(port);
 622                 } while (!UART_TX_READY(status));
 623                 UART_PUT_CHAR(port, s[i]);
 624                 if (s[i] == '\n') {
 625                         do {
 626                                 status = UART_GET_FR(port);
 627                         } while (!UART_TX_READY(status));
 628                         UART_PUT_CHAR(port, '\r');
 629                 }
 630         }
 631
 632         /*
 633          *      Finally, wait for transmitter to become empty
 634          *      and restore the TCR
 635          */
 636         do {
 637                 status = UART_GET_FR(port);
 638         } while (status & UART01x_FR_BUSY);
 639         UART_PUT_CR(port, old_cr);
 640 }
 641
 642 static void __init
 643 pl010_console_get_options(struct uart_port *port, int *baud,
 644                              int *parity, int *bits)
 645 {
 646         if (UART_GET_CR(port) & UART01x_CR_UARTEN) {
 647                 unsigned int lcr_h, quot;
 648                 lcr_h = UART_GET_LCRH(port);
 649
 650                 *parity = 'n';
 651                 if (lcr_h & UART01x_LCRH_PEN) {
 652                         if (lcr_h & UART01x_LCRH_EPS)
 653                                 *parity = 'e';
 654                         else
 655                                 *parity = 'o';
 656                 }
 657
 658                 if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
 659                         *bits = 7;
 660                 else
 661                         *bits = 8;
 662
 663                 quot = UART_GET_LCRL(port) | UART_GET_LCRM(port) << 8;
 664                 *baud = port->uartclk / (16 * (quot + 1));
 665         }
 666 }
 667
 668 static int __init pl010_console_setup(struct console *co, char *options)
 669 {
 670         struct uart_port *port;
 671         int baud = 38400;
 672         int bits = 8;
 673         int parity = 'n';
 674         int flow = 'n';
 675
 676         /*
 677          * Check whether an invalid uart number has been specified, and
 678          * if so, search for the first available port that does have
 679          * console support.
 680          */
 681         if (co->index >= UART_NR)
 682                 co->index = 0;
 683         port = &amba_ports[co->index].port;
 684
 685         if (options)
 686                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 687         else
 688                 pl010_console_get_options(port, &baud, &parity, &bits);
 689
 690         return uart_set_options(port, co, baud, parity, bits, flow);
 691 }
 692
 693 static struct uart_driver amba_reg;
 694 static struct console amba_console = {
 695         .name           = "ttyAM",
 696         .write          = pl010_console_write,
 697         .device         = uart_console_device,
 698         .setup          = pl010_console_setup,
 699         .flags          = CON_PRINTBUFFER,
 700         .index          = -1,
 701         .data           = &amba_reg,
 702 };
 703
 704 static int __init amba_console_init(void)
 705 {
 706         /*
 707          * All port initializations are done statically
 708          */
 709         register_console(&amba_console);
 710         return 0;
 711 }
 712 console_initcall(amba_console_init);
 713
 714 static int __init amba_late_console_init(void)
 715 {
 716         if (!(amba_console.flags & CON_ENABLED))
 717                 register_console(&amba_console);
 718         return 0;
 719 }
 720 late_initcall(amba_late_console_init);
 721
 722 #define AMBA_CONSOLE    &amba_console
 723 #else
 724 #define AMBA_CONSOLE    NULL
 725 #endif
 726
 727 static struct uart_driver amba_reg = {
 728         .owner                  = THIS_MODULE,
 729         .driver_name            = "ttyAM",
 730         .dev_name               = "ttyAM",
 731         .major                  = SERIAL_AMBA_MAJOR,
 732         .minor                  = SERIAL_AMBA_MINOR,
 733         .nr                     = UART_NR,
 734         .cons                   = AMBA_CONSOLE,
 735 };
 736
 737 static int pl010_probe(struct amba_device *dev, void *id)
 738 {
 739         int i;
 740
 741         for (i = 0; i < UART_NR; i++) {
 742                 if (amba_ports[i].port.mapbase != dev->res.start)
 743                         continue;
 744
 745                 amba_ports[i].port.dev = &dev->dev;
 746                 uart_add_one_port(&amba_reg, &amba_ports[i].port);
 747                 amba_set_drvdata(dev, &amba_ports[i]);
 748                 break;
 749         }
 750
 751         return 0;
 752 }
 753
 754 static int pl010_remove(struct amba_device *dev)
 755 {
 756         struct uart_amba_port *uap = amba_get_drvdata(dev);
 757
 758         if (uap)
 759                 uart_remove_one_port(&amba_reg, &uap->port);
 760
 761         amba_set_drvdata(dev, NULL);
 762
 763         return 0;
 764 }
 765
 766 static int pl010_suspend(struct amba_device *dev, pm_message_t state)
 767 {
 768         struct uart_amba_port *uap = amba_get_drvdata(dev);
 769
 770         if (uap)
 771                 uart_suspend_port(&amba_reg, &uap->port);
 772
 773         return 0;
 774 }
 775
 776 static int pl010_resume(struct amba_device *dev)
 777 {
 778         struct uart_amba_port *uap = amba_get_drvdata(dev);
 779
 780         if (uap)
 781                 uart_resume_port(&amba_reg, &uap->port);
 782
 783         return 0;
 784 }
 785
 786 static struct amba_id pl010_ids[] __initdata = {
 787         {
 788                 .id     = 0x00041010,
 789                 .mask   = 0x000fffff,
 790         },
 791         { 0, 0 },
 792 };
 793
 794 static struct amba_driver pl010_driver = {
 795         .drv = {
 796                 .name   = "uart-pl010",
 797         },
 798         .id_table       = pl010_ids,
 799         .probe          = pl010_probe,
 800         .remove         = pl010_remove,
 801         .suspend        = pl010_suspend,
 802         .resume         = pl010_resume,
 803 };
 804
 805 static int __init pl010_init(void)
 806 {
 807         int ret;
 808
 809         printk(KERN_INFO "Serial: AMBA driver $Revision: 1.41 $\n");
 810
 811         ret = uart_register_driver(&amba_reg);
 812         if (ret == 0) {
 813                 ret = amba_driver_register(&pl010_driver);
 814                 if (ret)
 815                         uart_unregister_driver(&amba_reg);
 816         }
 817         return ret;
 818 }
 819
 820 static void __exit pl010_exit(void)
 821 {
 822         amba_driver_unregister(&pl010_driver);
 823         uart_unregister_driver(&amba_reg);
 824 }
 825
 826 module_init(pl010_init);
 827 module_exit(pl010_exit);
 828
 829 MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
 830 MODULE_DESCRIPTION("ARM AMBA serial port driver $Revision: 1.41 $");
 831 MODULE_LICENSE("GPL");