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/amba.h>
  54 #include <asm/hardware/amba_serial.h>
  55
  56 #define UART_NR         2
  57
  58 #define SERIAL_AMBA_MAJOR       204
  59 #define SERIAL_AMBA_MINOR       16
  60 #define SERIAL_AMBA_NR          UART_NR
  61
  62 #define AMBA_ISR_PASS_LIMIT     256
  63
  64 /*
  65  * Access macros for the AMBA UARTs
  66  */
  67 #define UART_GET_INT_STATUS(p)  readb((p)->membase + UART010_IIR)
  68 #define UART_PUT_ICR(p, c)      writel((c), (p)->membase + UART010_ICR)
  69 #define UART_GET_FR(p)          readb((p)->membase + UART01x_FR)
  70 #define UART_GET_CHAR(p)        readb((p)->membase + UART01x_DR)
  71 #define UART_PUT_CHAR(p, c)     writel((c), (p)->membase + UART01x_DR)
  72 #define UART_GET_RSR(p)         readb((p)->membase + UART01x_RSR)
  73 #define UART_GET_CR(p)          readb((p)->membase + UART010_CR)
  74 #define UART_PUT_CR(p,c)        writel((c), (p)->membase + UART010_CR)
  75 #define UART_GET_LCRL(p)        readb((p)->membase + UART010_LCRL)
  76 #define UART_PUT_LCRL(p,c)      writel((c), (p)->membase + UART010_LCRL)
  77 #define UART_GET_LCRM(p)        readb((p)->membase + UART010_LCRM)
  78 #define UART_PUT_LCRM(p,c)      writel((c), (p)->membase + UART010_LCRM)
  79 #define UART_GET_LCRH(p)        readb((p)->membase + UART010_LCRH)
  80 #define UART_PUT_LCRH(p,c)      writel((c), (p)->membase + UART010_LCRH)
  81 #define UART_RX_DATA(s)         (((s) & UART01x_FR_RXFE) == 0)
  82 #define UART_TX_READY(s)        (((s) & UART01x_FR_TXFF) == 0)
  83 #define UART_TX_EMPTY(p)        ((UART_GET_FR(p) & UART01x_FR_TMSK) == 0)
  84
  85 #define UART_DUMMY_RSR_RX       /*256*/0
  86 #define UART_PORT_SIZE          64
  87
  88 /*
  89  * On the Integrator platform, the port RTS and DTR are provided by
  90  * bits in the following SC_CTRLS register bits:
  91  *        RTS  DTR
  92  *  UART0  7    6
  93  *  UART1  5    4
  94  */
  95 #define SC_CTRLC        (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLC_OFFSET)
  96 #define SC_CTRLS        (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLS_OFFSET)
  97
  98 /*
  99  * We wrap our port structure around the generic uart_port.
 100  */
 101 struct uart_amba_port {
 102         struct uart_port        port;
 103         unsigned int            dtr_mask;
 104         unsigned int            rts_mask;
 105         unsigned int            old_status;
 106 };
 107
 108 static void pl010_stop_tx(struct uart_port *port, unsigned int tty_stop)
 109 {
 110         unsigned int cr;
 111
 112         cr = UART_GET_CR(port);
 113         cr &= ~UART010_CR_TIE;
 114         UART_PUT_CR(port, cr);
 115 }
 116
 117 static void pl010_start_tx(struct uart_port *port, unsigned int tty_start)
 118 {
 119         unsigned int cr;
 120
 121         cr = UART_GET_CR(port);
 122         cr |= UART010_CR_TIE;
 123         UART_PUT_CR(port, cr);
 124 }
 125
 126 static void pl010_stop_rx(struct uart_port *port)
 127 {
 128         unsigned int cr;
 129
 130         cr = UART_GET_CR(port);
 131         cr &= ~(UART010_CR_RIE | UART010_CR_RTIE);
 132         UART_PUT_CR(port, cr);
 133 }
 134
 135 static void pl010_enable_ms(struct uart_port *port)
 136 {
 137         unsigned int cr;
 138
 139         cr = UART_GET_CR(port);
 140         cr |= UART010_CR_MSIE;
 141         UART_PUT_CR(port, cr);
 142 }
 143
 144 static void
 145 #ifdef SUPPORT_SYSRQ
 146 pl010_rx_chars(struct uart_port *port, struct pt_regs *regs)
 147 #else
 148 pl010_rx_chars(struct uart_port *port)
 149 #endif
 150 {
 151         struct tty_struct *tty = port->info->tty;
 152         unsigned int status, ch, flag, rsr, max_count = 256;
 153
 154         status = UART_GET_FR(port);
 155         while (UART_RX_DATA(status) && max_count--) {
 156                 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
 157                         if (tty->low_latency)
 158                                 tty_flip_buffer_push(tty);
 159                         /*
 160                          * If this failed then we will throw away the
 161                          * bytes but must do so to clear interrupts.
 162                          */
 163                 }
 164
 165                 ch = UART_GET_CHAR(port);
 166                 flag = TTY_NORMAL;
 167
 168                 port->icount.rx++;
 169
 170                 /*
 171                  * Note that the error handling code is
 172                  * out of the main execution path
 173                  */
 174                 rsr = UART_GET_RSR(port) | UART_DUMMY_RSR_RX;
 175                 if (rsr & UART01x_RSR_ANY) {
 176                         if (rsr & UART01x_RSR_BE) {
 177                                 rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
 178                                 port->icount.brk++;
 179                                 if (uart_handle_break(port))
 180                                         goto ignore_char;
 181                         } else if (rsr & UART01x_RSR_PE)
 182                                 port->icount.parity++;
 183                         else if (rsr & UART01x_RSR_FE)
 184                                 port->icount.frame++;
 185                         if (rsr & UART01x_RSR_OE)
 186                                 port->icount.overrun++;
 187
 188                         rsr &= port->read_status_mask;
 189
 190                         if (rsr & UART01x_RSR_BE)
 191                                 flag = TTY_BREAK;
 192                         else if (rsr & UART01x_RSR_PE)
 193                                 flag = TTY_PARITY;
 194                         else if (rsr & UART01x_RSR_FE)
 195                                 flag = TTY_FRAME;
 196                 }
 197
 198                 if (uart_handle_sysrq_char(port, ch, regs))
 199                         goto ignore_char;
 200
 201                 if ((rsr & port->ignore_status_mask) == 0) {
 202                         tty_insert_flip_char(tty, ch, flag);
 203                 }
 204                 if ((rsr & UART01x_RSR_OE) &&
 205                     tty->flip.count < TTY_FLIPBUF_SIZE) {
 206                         /*
 207                          * Overrun is special, since it's reported
 208                          * immediately, and doesn't affect the current
 209                          * character
 210                          */
 211                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 212                 }
 213         ignore_char:
 214                 status = UART_GET_FR(port);
 215         }
 216         tty_flip_buffer_push(tty);
 217         return;
 218 }
 219
 220 static void pl010_tx_chars(struct uart_port *port)
 221 {
 222         struct circ_buf *xmit = &port->info->xmit;
 223         int count;
 224
 225         if (port->x_char) {
 226                 UART_PUT_CHAR(port, port->x_char);
 227                 port->icount.tx++;
 228                 port->x_char = 0;
 229                 return;
 230         }
 231         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 232                 pl010_stop_tx(port, 0);
 233                 return;
 234         }
 235
 236         count = port->fifosize >> 1;
 237         do {
 238                 UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
 239                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 240                 port->icount.tx++;
 241                 if (uart_circ_empty(xmit))
 242                         break;
 243         } while (--count > 0);
 244
 245         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 246                 uart_write_wakeup(port);
 247
 248         if (uart_circ_empty(xmit))
 249                 pl010_stop_tx(port, 0);
 250 }
 251
 252 static void pl010_modem_status(struct uart_port *port)
 253 {
 254         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 255         unsigned int status, delta;
 256
 257         UART_PUT_ICR(&uap->port, 0);
 258
 259         status = UART_GET_FR(&uap->port) & UART01x_FR_MODEM_ANY;
 260
 261         delta = status ^ uap->old_status;
 262         uap->old_status = status;
 263
 264         if (!delta)
 265                 return;
 266
 267         if (delta & UART01x_FR_DCD)
 268                 uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
 269
 270         if (delta & UART01x_FR_DSR)
 271                 uap->port.icount.dsr++;
 272
 273         if (delta & UART01x_FR_CTS)
 274                 uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
 275
 276         wake_up_interruptible(&uap->port.info->delta_msr_wait);
 277 }
 278
 279 static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs)
 280 {
 281         struct uart_port *port = dev_id;
 282         unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
 283         int handled = 0;
 284
 285         spin_lock(&port->lock);
 286
 287         status = UART_GET_INT_STATUS(port);
 288         if (status) {
 289                 do {
 290                         if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
 291 #ifdef SUPPORT_SYSRQ
 292                                 pl010_rx_chars(port, regs);
 293 #else
 294                                 pl010_rx_chars(port);
 295 #endif
 296                         if (status & UART010_IIR_MIS)
 297                                 pl010_modem_status(port);
 298                         if (status & UART010_IIR_TIS)
 299                                 pl010_tx_chars(port);
 300
 301                         if (pass_counter-- == 0)
 302                                 break;
 303
 304                         status = UART_GET_INT_STATUS(port);
 305                 } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
 306                                    UART010_IIR_TIS));
 307                 handled = 1;
 308         }
 309
 310         spin_unlock(&port->lock);
 311
 312         return IRQ_RETVAL(handled);
 313 }
 314
 315 static unsigned int pl010_tx_empty(struct uart_port *port)
 316 {
 317         return UART_GET_FR(port) & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
 318 }
 319
 320 static unsigned int pl010_get_mctrl(struct uart_port *port)
 321 {
 322         unsigned int result = 0;
 323         unsigned int status;
 324
 325         status = UART_GET_FR(port);
 326         if (status & UART01x_FR_DCD)
 327                 result |= TIOCM_CAR;
 328         if (status & UART01x_FR_DSR)
 329                 result |= TIOCM_DSR;
 330         if (status & UART01x_FR_CTS)
 331                 result |= TIOCM_CTS;
 332
 333         return result;
 334 }
 335
 336 static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
 337 {
 338         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 339         unsigned int ctrls = 0, ctrlc = 0;
 340
 341         if (mctrl & TIOCM_RTS)
 342                 ctrlc |= uap->rts_mask;
 343         else
 344                 ctrls |= uap->rts_mask;
 345
 346         if (mctrl & TIOCM_DTR)
 347                 ctrlc |= uap->dtr_mask;
 348         else
 349                 ctrls |= uap->dtr_mask;
 350
 351         __raw_writel(ctrls, SC_CTRLS);
 352         __raw_writel(ctrlc, SC_CTRLC);
 353 }
 354
 355 static void pl010_break_ctl(struct uart_port *port, int break_state)
 356 {
 357         unsigned long flags;
 358         unsigned int lcr_h;
 359
 360         spin_lock_irqsave(&port->lock, flags);
 361         lcr_h = UART_GET_LCRH(port);
 362         if (break_state == -1)
 363                 lcr_h |= UART01x_LCRH_BRK;
 364         else
 365                 lcr_h &= ~UART01x_LCRH_BRK;
 366         UART_PUT_LCRH(port, lcr_h);
 367         spin_unlock_irqrestore(&port->lock, flags);
 368 }
 369
 370 static int pl010_startup(struct uart_port *port)
 371 {
 372         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 373         int retval;
 374
 375         /*
 376          * Allocate the IRQ
 377          */
 378         retval = request_irq(port->irq, pl010_int, 0, "uart-pl010", port);
 379         if (retval)
 380                 return retval;
 381
 382         /*
 383          * initialise the old status of the modem signals
 384          */
 385         uap->old_status = UART_GET_FR(port) & UART01x_FR_MODEM_ANY;
 386
 387         /*
 388          * Finally, enable interrupts
 389          */
 390         UART_PUT_CR(port, UART01x_CR_UARTEN | UART010_CR_RIE |
 391                           UART010_CR_RTIE);
 392
 393         return 0;
 394 }
 395
 396 static void pl010_shutdown(struct uart_port *port)
 397 {
 398         /*
 399          * Free the interrupt
 400          */
 401         free_irq(port->irq, port);
 402
 403         /*
 404          * disable all interrupts, disable the port
 405          */
 406         UART_PUT_CR(port, 0);
 407
 408         /* disable break condition and fifos */
 409         UART_PUT_LCRH(port, UART_GET_LCRH(port) &
 410                 ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN));
 411 }
 412
 413 static void
 414 pl010_set_termios(struct uart_port *port, struct termios *termios,
 415                      struct termios *old)
 416 {
 417         unsigned int lcr_h, old_cr;
 418         unsigned long flags;
 419         unsigned int baud, quot;
 420
 421         /*
 422          * Ask the core to calculate the divisor for us.
 423          */
 424         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 425         quot = uart_get_divisor(port, baud);
 426
 427         switch (termios->c_cflag & CSIZE) {
 428         case CS5:
 429                 lcr_h = UART01x_LCRH_WLEN_5;
 430                 break;
 431         case CS6:
 432                 lcr_h = UART01x_LCRH_WLEN_6;
 433                 break;
 434         case CS7:
 435                 lcr_h = UART01x_LCRH_WLEN_7;
 436                 break;
 437         default: // CS8
 438                 lcr_h = UART01x_LCRH_WLEN_8;
 439                 break;
 440         }
 441         if (termios->c_cflag & CSTOPB)
 442                 lcr_h |= UART01x_LCRH_STP2;
 443         if (termios->c_cflag & PARENB) {
 444                 lcr_h |= UART01x_LCRH_PEN;
 445                 if (!(termios->c_cflag & PARODD))
 446                         lcr_h |= UART01x_LCRH_EPS;
 447         }
 448         if (port->fifosize > 1)
 449                 lcr_h |= UART01x_LCRH_FEN;
 450
 451         spin_lock_irqsave(&port->lock, flags);
 452
 453         /*
 454          * Update the per-port timeout.
 455          */
 456         uart_update_timeout(port, termios->c_cflag, baud);
 457
 458         port->read_status_mask = UART01x_RSR_OE;
 459         if (termios->c_iflag & INPCK)
 460                 port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 461         if (termios->c_iflag & (BRKINT | PARMRK))
 462                 port->read_status_mask |= UART01x_RSR_BE;
 463
 464         /*
 465          * Characters to ignore
 466          */
 467         port->ignore_status_mask = 0;
 468         if (termios->c_iflag & IGNPAR)
 469                 port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 470         if (termios->c_iflag & IGNBRK) {
 471                 port->ignore_status_mask |= UART01x_RSR_BE;
 472                 /*
 473                  * If we're ignoring parity and break indicators,
 474                  * ignore overruns too (for real raw support).
 475                  */
 476                 if (termios->c_iflag & IGNPAR)
 477                         port->ignore_status_mask |= UART01x_RSR_OE;
 478         }
 479
 480         /*
 481          * Ignore all characters if CREAD is not set.
 482          */
 483         if ((termios->c_cflag & CREAD) == 0)
 484                 port->ignore_status_mask |= UART_DUMMY_RSR_RX;
 485
 486         /* first, disable everything */
 487         old_cr = UART_GET_CR(port) & ~UART010_CR_MSIE;
 488
 489         if (UART_ENABLE_MS(port, termios->c_cflag))
 490                 old_cr |= UART010_CR_MSIE;
 491
 492         UART_PUT_CR(port, 0);
 493
 494         /* Set baud rate */
 495         quot -= 1;
 496         UART_PUT_LCRM(port, ((quot & 0xf00) >> 8));
 497         UART_PUT_LCRL(port, (quot & 0xff));
 498
 499         /*
 500          * ----------v----------v----------v----------v-----
 501          * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
 502          * ----------^----------^----------^----------^-----
 503          */
 504         UART_PUT_LCRH(port, lcr_h);
 505         UART_PUT_CR(port, old_cr);
 506
 507         spin_unlock_irqrestore(&port->lock, flags);
 508 }
 509
 510 static const char *pl010_type(struct uart_port *port)
 511 {
 512         return port->type == PORT_AMBA ? "AMBA" : NULL;
 513 }
 514
 515 /*
 516  * Release the memory region(s) being used by 'port'
 517  */
 518 static void pl010_release_port(struct uart_port *port)
 519 {
 520         release_mem_region(port->mapbase, UART_PORT_SIZE);
 521 }
 522
 523 /*
 524  * Request the memory region(s) being used by 'port'
 525  */
 526 static int pl010_request_port(struct uart_port *port)
 527 {
 528         return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
 529                         != NULL ? 0 : -EBUSY;
 530 }
 531
 532 /*
 533  * Configure/autoconfigure the port.
 534  */
 535 static void pl010_config_port(struct uart_port *port, int flags)
 536 {
 537         if (flags & UART_CONFIG_TYPE) {
 538                 port->type = PORT_AMBA;
 539                 pl010_request_port(port);
 540         }
 541 }
 542
 543 /*
 544  * verify the new serial_struct (for TIOCSSERIAL).
 545  */
 546 static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
 547 {
 548         int ret = 0;
 549         if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
 550                 ret = -EINVAL;
 551         if (ser->irq < 0 || ser->irq >= NR_IRQS)
 552                 ret = -EINVAL;
 553         if (ser->baud_base < 9600)
 554                 ret = -EINVAL;
 555         return ret;
 556 }
 557
 558 static struct uart_ops amba_pl010_pops = {
 559         .tx_empty       = pl010_tx_empty,
 560         .set_mctrl      = pl010_set_mctrl,
 561         .get_mctrl      = pl010_get_mctrl,
 562         .stop_tx        = pl010_stop_tx,
 563         .start_tx       = pl010_start_tx,
 564         .stop_rx        = pl010_stop_rx,
 565         .enable_ms      = pl010_enable_ms,
 566         .break_ctl      = pl010_break_ctl,
 567         .startup        = pl010_startup,
 568         .shutdown       = pl010_shutdown,
 569         .set_termios    = pl010_set_termios,
 570         .type           = pl010_type,
 571         .release_port   = pl010_release_port,
 572         .request_port   = pl010_request_port,
 573         .config_port    = pl010_config_port,
 574         .verify_port    = pl010_verify_port,
 575 };
 576
 577 static struct uart_amba_port amba_ports[UART_NR] = {
 578         {
 579                 .port   = {
 580                         .membase        = (void *)IO_ADDRESS(INTEGRATOR_UART0_BASE),
 581                         .mapbase        = INTEGRATOR_UART0_BASE,
 582                         .iotype         = SERIAL_IO_MEM,
 583                         .irq            = IRQ_UARTINT0,
 584                         .uartclk        = 14745600,
 585                         .fifosize       = 16,
 586                         .ops            = &amba_pl010_pops,
 587                         .flags          = ASYNC_BOOT_AUTOCONF,
 588                         .line           = 0,
 589                 },
 590                 .dtr_mask       = 1 << 5,
 591                 .rts_mask       = 1 << 4,
 592         },
 593         {
 594                 .port   = {
 595                         .membase        = (void *)IO_ADDRESS(INTEGRATOR_UART1_BASE),
 596                         .mapbase        = INTEGRATOR_UART1_BASE,
 597                         .iotype         = SERIAL_IO_MEM,
 598                         .irq            = IRQ_UARTINT1,
 599                         .uartclk        = 14745600,
 600                         .fifosize       = 16,
 601                         .ops            = &amba_pl010_pops,
 602                         .flags          = ASYNC_BOOT_AUTOCONF,
 603                         .line           = 1,
 604                 },
 605                 .dtr_mask       = 1 << 7,
 606                 .rts_mask       = 1 << 6,
 607         }
 608 };
 609
 610 #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
 611
 612 static void
 613 pl010_console_write(struct console *co, const char *s, unsigned int count)
 614 {
 615         struct uart_port *port = &amba_ports[co->index].port;
 616         unsigned int status, old_cr;
 617         int i;
 618
 619         /*
 620          *      First save the CR then disable the interrupts
 621          */
 622         old_cr = UART_GET_CR(port);
 623         UART_PUT_CR(port, UART01x_CR_UARTEN);
 624
 625         /*
 626          *      Now, do each character
 627          */
 628         for (i = 0; i < count; i++) {
 629                 do {
 630                         status = UART_GET_FR(port);
 631                 } while (!UART_TX_READY(status));
 632                 UART_PUT_CHAR(port, s[i]);
 633                 if (s[i] == '\n') {
 634                         do {
 635                                 status = UART_GET_FR(port);
 636                         } while (!UART_TX_READY(status));
 637                         UART_PUT_CHAR(port, '\r');
 638                 }
 639         }
 640
 641         /*
 642          *      Finally, wait for transmitter to become empty
 643          *      and restore the TCR
 644          */
 645         do {
 646                 status = UART_GET_FR(port);
 647         } while (status & UART01x_FR_BUSY);
 648         UART_PUT_CR(port, old_cr);
 649 }
 650
 651 static void __init
 652 pl010_console_get_options(struct uart_port *port, int *baud,
 653                              int *parity, int *bits)
 654 {
 655         if (UART_GET_CR(port) & UART01x_CR_UARTEN) {
 656                 unsigned int lcr_h, quot;
 657                 lcr_h = UART_GET_LCRH(port);
 658
 659                 *parity = 'n';
 660                 if (lcr_h & UART01x_LCRH_PEN) {
 661                         if (lcr_h & UART01x_LCRH_EPS)
 662                                 *parity = 'e';
 663                         else
 664                                 *parity = 'o';
 665                 }
 666
 667                 if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
 668                         *bits = 7;
 669                 else
 670                         *bits = 8;
 671
 672                 quot = UART_GET_LCRL(port) | UART_GET_LCRM(port) << 8;
 673                 *baud = port->uartclk / (16 * (quot + 1));
 674         }
 675 }
 676
 677 static int __init pl010_console_setup(struct console *co, char *options)
 678 {
 679         struct uart_port *port;
 680         int baud = 38400;
 681         int bits = 8;
 682         int parity = 'n';
 683         int flow = 'n';
 684
 685         /*
 686          * Check whether an invalid uart number has been specified, and
 687          * if so, search for the first available port that does have
 688          * console support.
 689          */
 690         if (co->index >= UART_NR)
 691                 co->index = 0;
 692         port = &amba_ports[co->index].port;
 693
 694         if (options)
 695                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 696         else
 697                 pl010_console_get_options(port, &baud, &parity, &bits);
 698
 699         return uart_set_options(port, co, baud, parity, bits, flow);
 700 }
 701
 702 extern struct uart_driver amba_reg;
 703 static struct console amba_console = {
 704         .name           = "ttyAM",
 705         .write          = pl010_console_write,
 706         .device         = uart_console_device,
 707         .setup          = pl010_console_setup,
 708         .flags          = CON_PRINTBUFFER,
 709         .index          = -1,
 710         .data           = &amba_reg,
 711 };
 712
 713 static int __init amba_console_init(void)
 714 {
 715         /*
 716          * All port initializations are done statically
 717          */
 718         register_console(&amba_console);
 719         return 0;
 720 }
 721 console_initcall(amba_console_init);
 722
 723 static int __init amba_late_console_init(void)
 724 {
 725         if (!(amba_console.flags & CON_ENABLED))
 726                 register_console(&amba_console);
 727         return 0;
 728 }
 729 late_initcall(amba_late_console_init);
 730
 731 #define AMBA_CONSOLE    &amba_console
 732 #else
 733 #define AMBA_CONSOLE    NULL
 734 #endif
 735
 736 static struct uart_driver amba_reg = {
 737         .owner                  = THIS_MODULE,
 738         .driver_name            = "ttyAM",
 739         .dev_name               = "ttyAM",
 740         .major                  = SERIAL_AMBA_MAJOR,
 741         .minor                  = SERIAL_AMBA_MINOR,
 742         .nr                     = UART_NR,
 743         .cons                   = AMBA_CONSOLE,
 744 };
 745
 746 static int pl010_probe(struct amba_device *dev, void *id)
 747 {
 748         int i;
 749
 750         for (i = 0; i < UART_NR; i++) {
 751                 if (amba_ports[i].port.mapbase != dev->res.start)
 752                         continue;
 753
 754                 amba_ports[i].port.dev = &dev->dev;
 755                 uart_add_one_port(&amba_reg, &amba_ports[i].port);
 756                 amba_set_drvdata(dev, &amba_ports[i]);
 757                 break;
 758         }
 759
 760         return 0;
 761 }
 762
 763 static int pl010_remove(struct amba_device *dev)
 764 {
 765         struct uart_amba_port *uap = amba_get_drvdata(dev);
 766
 767         if (uap)
 768                 uart_remove_one_port(&amba_reg, &uap->port);
 769
 770         amba_set_drvdata(dev, NULL);
 771
 772         return 0;
 773 }
 774
 775 static int pl010_suspend(struct amba_device *dev, u32 state)
 776 {
 777         struct uart_amba_port *uap = amba_get_drvdata(dev);
 778
 779         if (uap)
 780                 uart_suspend_port(&amba_reg, &uap->port);
 781
 782         return 0;
 783 }
 784
 785 static int pl010_resume(struct amba_device *dev)
 786 {
 787         struct uart_amba_port *uap = amba_get_drvdata(dev);
 788
 789         if (uap)
 790                 uart_resume_port(&amba_reg, &uap->port);
 791
 792         return 0;
 793 }
 794
 795 static struct amba_id pl010_ids[] __initdata = {
 796         {
 797                 .id     = 0x00041010,
 798                 .mask   = 0x000fffff,
 799         },
 800         { 0, 0 },
 801 };
 802
 803 static struct amba_driver pl010_driver = {
 804         .drv = {
 805                 .name   = "uart-pl010",
 806         },
 807         .id_table       = pl010_ids,
 808         .probe          = pl010_probe,
 809         .remove         = pl010_remove,
 810         .suspend        = pl010_suspend,
 811         .resume         = pl010_resume,
 812 };
 813
 814 static int __init pl010_init(void)
 815 {
 816         int ret;
 817
 818         printk(KERN_INFO "Serial: AMBA driver $Revision: 1.41 $\n");
 819
 820         ret = uart_register_driver(&amba_reg);
 821         if (ret == 0) {
 822                 ret = amba_driver_register(&pl010_driver);
 823                 if (ret)
 824                         uart_unregister_driver(&amba_reg);
 825         }
 826         return ret;
 827 }
 828
 829 static void __exit pl010_exit(void)
 830 {
 831         amba_driver_unregister(&pl010_driver);
 832         uart_unregister_driver(&amba_reg);
 833 }
 834
 835 module_init(pl010_init);
 836 module_exit(pl010_exit);
 837
 838 MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
 839 MODULE_DESCRIPTION("ARM AMBA serial port driver $Revision: 1.41 $");
 840 MODULE_LICENSE("GPL");