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