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 #include <linux/module.h>
  36 #include <linux/tty.h>
  37 #include <linux/ioport.h>
  38 #include <linux/init.h>
  39 #include <linux/serial.h>
  40 #include <linux/console.h>
  41 #include <linux/sysrq.h>
  42 #include <linux/device.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/hardware/amba.h>
  47
  48 #if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  49 #define SUPPORT_SYSRQ
  50 #endif
  51
  52 #include <linux/serial_core.h>
  53
  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, 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                         tty->flip.work.func((void *)tty);
 158                         if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
 159                                 printk(KERN_WARNING "TTY_DONT_FLIP set\n");
 160                                 return;
 161                         }
 162                 }
 163
 164                 ch = UART_GET_CHAR(port);
 165
 166                 *tty->flip.char_buf_ptr = ch;
 167                 *tty->flip.flag_buf_ptr = TTY_NORMAL;
 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                                 *tty->flip.flag_buf_ptr = TTY_BREAK;
 192                         else if (rsr & UART01x_RSR_PE)
 193                                 *tty->flip.flag_buf_ptr = TTY_PARITY;
 194                         else if (rsr & UART01x_RSR_FE)
 195                                 *tty->flip.flag_buf_ptr = 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->flip.flag_buf_ptr++;
 203                         tty->flip.char_buf_ptr++;
 204                         tty->flip.count++;
 205                 }
 206                 if ((rsr & UART01x_RSR_OE) &&
 207                     tty->flip.count < TTY_FLIPBUF_SIZE) {
 208                         /*
 209                          * Overrun is special, since it's reported
 210                          * immediately, and doesn't affect the current
 211                          * character
 212                          */
 213                         *tty->flip.char_buf_ptr++ = 0;
 214                         *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
 215                         tty->flip.count++;
 216                 }
 217         ignore_char:
 218                 status = UART_GET_FR(port);
 219         }
 220         tty_flip_buffer_push(tty);
 221         return;
 222 }
 223
 224 static void pl010_tx_chars(struct uart_port *port)
 225 {
 226         struct circ_buf *xmit = &port->info->xmit;
 227         int count;
 228
 229         if (port->x_char) {
 230                 UART_PUT_CHAR(port, port->x_char);
 231                 port->icount.tx++;
 232                 port->x_char = 0;
 233                 return;
 234         }
 235         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 236                 pl010_stop_tx(port, 0);
 237                 return;
 238         }
 239
 240         count = port->fifosize >> 1;
 241         do {
 242                 UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
 243                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 244                 port->icount.tx++;
 245                 if (uart_circ_empty(xmit))
 246                         break;
 247         } while (--count > 0);
 248
 249         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 250                 uart_write_wakeup(port);
 251
 252         if (uart_circ_empty(xmit))
 253                 pl010_stop_tx(port, 0);
 254 }
 255
 256 static void pl010_modem_status(struct uart_port *port)
 257 {
 258         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 259         unsigned int status, delta;
 260
 261         UART_PUT_ICR(&uap->port, 0);
 262
 263         status = UART_GET_FR(&uap->port) & UART01x_FR_MODEM_ANY;
 264
 265         delta = status ^ uap->old_status;
 266         uap->old_status = status;
 267
 268         if (!delta)
 269                 return;
 270
 271         if (delta & UART01x_FR_DCD)
 272                 uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
 273
 274         if (delta & UART01x_FR_DSR)
 275                 uap->port.icount.dsr++;
 276
 277         if (delta & UART01x_FR_CTS)
 278                 uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
 279
 280         wake_up_interruptible(&uap->port.info->delta_msr_wait);
 281 }
 282
 283 static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs)
 284 {
 285         struct uart_port *port = dev_id;
 286         unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
 287         int handled = 0;
 288
 289         spin_lock(&port->lock);
 290
 291         status = UART_GET_INT_STATUS(port);
 292         if (status) {
 293                 do {
 294                         if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
 295 #ifdef SUPPORT_SYSRQ
 296                                 pl010_rx_chars(port, regs);
 297 #else
 298                                 pl010_rx_chars(port);
 299 #endif
 300                         if (status & UART010_IIR_MIS)
 301                                 pl010_modem_status(port);
 302                         if (status & UART010_IIR_TIS)
 303                                 pl010_tx_chars(port);
 304
 305                         if (pass_counter-- == 0)
 306                                 break;
 307
 308                         status = UART_GET_INT_STATUS(port);
 309                 } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
 310                                    UART010_IIR_TIS));
 311                 handled = 1;
 312         }
 313
 314         spin_unlock(&port->lock);
 315
 316         return IRQ_RETVAL(handled);
 317 }
 318
 319 static unsigned int pl010_tx_empty(struct uart_port *port)
 320 {
 321         return UART_GET_FR(port) & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
 322 }
 323
 324 static unsigned int pl010_get_mctrl(struct uart_port *port)
 325 {
 326         unsigned int result = 0;
 327         unsigned int status;
 328
 329         status = UART_GET_FR(port);
 330         if (status & UART01x_FR_DCD)
 331                 result |= TIOCM_CAR;
 332         if (status & UART01x_FR_DSR)
 333                 result |= TIOCM_DSR;
 334         if (status & UART01x_FR_CTS)
 335                 result |= TIOCM_CTS;
 336
 337         return result;
 338 }
 339
 340 static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
 341 {
 342         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 343         unsigned int ctrls = 0, ctrlc = 0;
 344
 345         if (mctrl & TIOCM_RTS)
 346                 ctrlc |= uap->rts_mask;
 347         else
 348                 ctrls |= uap->rts_mask;
 349
 350         if (mctrl & TIOCM_DTR)
 351                 ctrlc |= uap->dtr_mask;
 352         else
 353                 ctrls |= uap->dtr_mask;
 354
 355         __raw_writel(ctrls, SC_CTRLS);
 356         __raw_writel(ctrlc, SC_CTRLC);
 357 }
 358
 359 static void pl010_break_ctl(struct uart_port *port, int break_state)
 360 {
 361         unsigned long flags;
 362         unsigned int lcr_h;
 363
 364         spin_lock_irqsave(&port->lock, flags);
 365         lcr_h = UART_GET_LCRH(port);
 366         if (break_state == -1)
 367                 lcr_h |= UART01x_LCRH_BRK;
 368         else
 369                 lcr_h &= ~UART01x_LCRH_BRK;
 370         UART_PUT_LCRH(port, lcr_h);
 371         spin_unlock_irqrestore(&port->lock, flags);
 372 }
 373
 374 static int pl010_startup(struct uart_port *port)
 375 {
 376         struct uart_amba_port *uap = (struct uart_amba_port *)port;
 377         int retval;
 378
 379         /*
 380          * Allocate the IRQ
 381          */
 382         retval = request_irq(port->irq, pl010_int, 0, "uart-pl010", port);
 383         if (retval)
 384                 return retval;
 385
 386         /*
 387          * initialise the old status of the modem signals
 388          */
 389         uap->old_status = UART_GET_FR(port) & UART01x_FR_MODEM_ANY;
 390
 391         /*
 392          * Finally, enable interrupts
 393          */
 394         UART_PUT_CR(port, UART01x_CR_UARTEN | UART010_CR_RIE |
 395                           UART010_CR_RTIE);
 396
 397         return 0;
 398 }
 399
 400 static void pl010_shutdown(struct uart_port *port)
 401 {
 402         /*
 403          * Free the interrupt
 404          */
 405         free_irq(port->irq, port);
 406
 407         /*
 408          * disable all interrupts, disable the port
 409          */
 410         UART_PUT_CR(port, 0);
 411
 412         /* disable break condition and fifos */
 413         UART_PUT_LCRH(port, UART_GET_LCRH(port) &
 414                 ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN));
 415 }
 416
 417 static void
 418 pl010_set_termios(struct uart_port *port, struct termios *termios,
 419                      struct termios *old)
 420 {
 421         unsigned int lcr_h, old_cr;
 422         unsigned long flags;
 423         unsigned int baud, quot;
 424
 425         /*
 426          * Ask the core to calculate the divisor for us.
 427          */
 428         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 429         quot = uart_get_divisor(port, baud);
 430
 431         switch (termios->c_cflag & CSIZE) {
 432         case CS5:
 433                 lcr_h = UART01x_LCRH_WLEN_5;
 434                 break;
 435         case CS6:
 436                 lcr_h = UART01x_LCRH_WLEN_6;
 437                 break;
 438         case CS7:
 439                 lcr_h = UART01x_LCRH_WLEN_7;
 440                 break;
 441         default: // CS8
 442                 lcr_h = UART01x_LCRH_WLEN_8;
 443                 break;
 444         }
 445         if (termios->c_cflag & CSTOPB)
 446                 lcr_h |= UART01x_LCRH_STP2;
 447         if (termios->c_cflag & PARENB) {
 448                 lcr_h |= UART01x_LCRH_PEN;
 449                 if (!(termios->c_cflag & PARODD))
 450                         lcr_h |= UART01x_LCRH_EPS;
 451         }
 452         if (port->fifosize > 1)
 453                 lcr_h |= UART01x_LCRH_FEN;
 454
 455         spin_lock_irqsave(&port->lock, flags);
 456
 457         /*
 458          * Update the per-port timeout.
 459          */
 460         uart_update_timeout(port, termios->c_cflag, baud);
 461
 462         port->read_status_mask = UART01x_RSR_OE;
 463         if (termios->c_iflag & INPCK)
 464                 port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 465         if (termios->c_iflag & (BRKINT | PARMRK))
 466                 port->read_status_mask |= UART01x_RSR_BE;
 467
 468         /*
 469          * Characters to ignore
 470          */
 471         port->ignore_status_mask = 0;
 472         if (termios->c_iflag & IGNPAR)
 473                 port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 474         if (termios->c_iflag & IGNBRK) {
 475                 port->ignore_status_mask |= UART01x_RSR_BE;
 476                 /*
 477                  * If we're ignoring parity and break indicators,
 478                  * ignore overruns too (for real raw support).
 479                  */
 480                 if (termios->c_iflag & IGNPAR)
 481                         port->ignore_status_mask |= UART01x_RSR_OE;
 482         }
 483
 484         /*
 485          * Ignore all characters if CREAD is not set.
 486          */
 487         if ((termios->c_cflag & CREAD) == 0)
 488                 port->ignore_status_mask |= UART_DUMMY_RSR_RX;
 489
 490         /* first, disable everything */
 491         old_cr = UART_GET_CR(port) & ~UART010_CR_MSIE;
 492
 493         if (UART_ENABLE_MS(port, termios->c_cflag))
 494                 old_cr |= UART010_CR_MSIE;
 495
 496         UART_PUT_CR(port, 0);
 497
 498         /* Set baud rate */
 499         quot -= 1;
 500         UART_PUT_LCRM(port, ((quot & 0xf00) >> 8));
 501         UART_PUT_LCRL(port, (quot & 0xff));
 502
 503         /*
 504          * ----------v----------v----------v----------v-----
 505          * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
 506          * ----------^----------^----------^----------^-----
 507          */
 508         UART_PUT_LCRH(port, lcr_h);
 509         UART_PUT_CR(port, old_cr);
 510
 511         spin_unlock_irqrestore(&port->lock, flags);
 512 }
 513
 514 static const char *pl010_type(struct uart_port *port)
 515 {
 516         return port->type == PORT_AMBA ? "AMBA" : NULL;
 517 }
 518
 519 /*
 520  * Release the memory region(s) being used by 'port'
 521  */
 522 static void pl010_release_port(struct uart_port *port)
 523 {
 524         release_mem_region(port->mapbase, UART_PORT_SIZE);
 525 }
 526
 527 /*
 528  * Request the memory region(s) being used by 'port'
 529  */
 530 static int pl010_request_port(struct uart_port *port)
 531 {
 532         return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
 533                         != NULL ? 0 : -EBUSY;
 534 }
 535
 536 /*
 537  * Configure/autoconfigure the port.
 538  */
 539 static void pl010_config_port(struct uart_port *port, int flags)
 540 {
 541         if (flags & UART_CONFIG_TYPE) {
 542                 port->type = PORT_AMBA;
 543                 pl010_request_port(port);
 544         }
 545 }
 546
 547 /*
 548  * verify the new serial_struct (for TIOCSSERIAL).
 549  */
 550 static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
 551 {
 552         int ret = 0;
 553         if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
 554                 ret = -EINVAL;
 555         if (ser->irq < 0 || ser->irq >= NR_IRQS)
 556                 ret = -EINVAL;
 557         if (ser->baud_base < 9600)
 558                 ret = -EINVAL;
 559         return ret;
 560 }
 561
 562 static struct uart_ops amba_pl010_pops = {
 563         .tx_empty       = pl010_tx_empty,
 564         .set_mctrl      = pl010_set_mctrl,
 565         .get_mctrl      = pl010_get_mctrl,
 566         .stop_tx        = pl010_stop_tx,
 567         .start_tx       = pl010_start_tx,
 568         .stop_rx        = pl010_stop_rx,
 569         .enable_ms      = pl010_enable_ms,
 570         .break_ctl      = pl010_break_ctl,
 571         .startup        = pl010_startup,
 572         .shutdown       = pl010_shutdown,
 573         .set_termios    = pl010_set_termios,
 574         .type           = pl010_type,
 575         .release_port   = pl010_release_port,
 576         .request_port   = pl010_request_port,
 577         .config_port    = pl010_config_port,
 578         .verify_port    = pl010_verify_port,
 579 };
 580
 581 static struct uart_amba_port amba_ports[UART_NR] = {
 582         {
 583                 .port   = {
 584                         .membase        = (void *)IO_ADDRESS(INTEGRATOR_UART0_BASE),
 585                         .mapbase        = INTEGRATOR_UART0_BASE,
 586                         .iotype         = SERIAL_IO_MEM,
 587                         .irq            = IRQ_UARTINT0,
 588                         .uartclk        = 14745600,
 589                         .fifosize       = 16,
 590                         .ops            = &amba_pl010_pops,
 591                         .flags          = ASYNC_BOOT_AUTOCONF,
 592                         .line           = 0,
 593                 },
 594                 .dtr_mask       = 1 << 5,
 595                 .rts_mask       = 1 << 4,
 596         },
 597         {
 598                 .port   = {
 599                         .membase        = (void *)IO_ADDRESS(INTEGRATOR_UART1_BASE),
 600                         .mapbase        = INTEGRATOR_UART1_BASE,
 601                         .iotype         = SERIAL_IO_MEM,
 602                         .irq            = IRQ_UARTINT1,
 603                         .uartclk        = 14745600,
 604                         .fifosize       = 16,
 605                         .ops            = &amba_pl010_pops,
 606                         .flags          = ASYNC_BOOT_AUTOCONF,
 607                         .line           = 1,
 608                 },
 609                 .dtr_mask       = 1 << 7,
 610                 .rts_mask       = 1 << 6,
 611         }
 612 };
 613
 614 #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
 615
 616 static void
 617 pl010_console_write(struct console *co, const char *s, unsigned int count)
 618 {
 619         struct uart_port *port = &amba_ports[co->index].port;
 620         unsigned int status, old_cr;
 621         int i;
 622
 623         /*
 624          *      First save the CR then disable the interrupts
 625          */
 626         old_cr = UART_GET_CR(port);
 627         UART_PUT_CR(port, UART01x_CR_UARTEN);
 628
 629         /*
 630          *      Now, do each character
 631          */
 632         for (i = 0; i < count; i++) {
 633                 do {
 634                         status = UART_GET_FR(port);
 635                 } while (!UART_TX_READY(status));
 636                 UART_PUT_CHAR(port, s[i]);
 637                 if (s[i] == '\n') {
 638                         do {
 639                                 status = UART_GET_FR(port);
 640                         } while (!UART_TX_READY(status));
 641                         UART_PUT_CHAR(port, '\r');
 642                 }
 643         }
 644
 645         /*
 646          *      Finally, wait for transmitter to become empty
 647          *      and restore the TCR
 648          */
 649         do {
 650                 status = UART_GET_FR(port);
 651         } while (status & UART01x_FR_BUSY);
 652         UART_PUT_CR(port, old_cr);
 653 }
 654
 655 static void __init
 656 pl010_console_get_options(struct uart_port *port, int *baud,
 657                              int *parity, int *bits)
 658 {
 659         if (UART_GET_CR(port) & UART01x_CR_UARTEN) {
 660                 unsigned int lcr_h, quot;
 661                 lcr_h = UART_GET_LCRH(port);
 662
 663                 *parity = 'n';
 664                 if (lcr_h & UART01x_LCRH_PEN) {
 665                         if (lcr_h & UART01x_LCRH_EPS)
 666                                 *parity = 'e';
 667                         else
 668                                 *parity = 'o';
 669                 }
 670
 671                 if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
 672                         *bits = 7;
 673                 else
 674                         *bits = 8;
 675
 676                 quot = UART_GET_LCRL(port) | UART_GET_LCRM(port) << 8;
 677                 *baud = port->uartclk / (16 * (quot + 1));
 678         }
 679 }
 680
 681 static int __init pl010_console_setup(struct console *co, char *options)
 682 {
 683         struct uart_port *port;
 684         int baud = 38400;
 685         int bits = 8;
 686         int parity = 'n';
 687         int flow = 'n';
 688
 689         /*
 690          * Check whether an invalid uart number has been specified, and
 691          * if so, search for the first available port that does have
 692          * console support.
 693          */
 694         if (co->index >= UART_NR)
 695                 co->index = 0;
 696         port = &amba_ports[co->index].port;
 697
 698         if (options)
 699                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 700         else
 701                 pl010_console_get_options(port, &baud, &parity, &bits);
 702
 703         return uart_set_options(port, co, baud, parity, bits, flow);
 704 }
 705
 706 extern struct uart_driver amba_reg;
 707 static struct console amba_console = {
 708         .name           = "ttyAM",
 709         .write          = pl010_console_write,
 710         .device         = uart_console_device,
 711         .setup          = pl010_console_setup,
 712         .flags          = CON_PRINTBUFFER,
 713         .index          = -1,
 714         .data           = &amba_reg,
 715 };
 716
 717 #define AMBA_CONSOLE    &amba_console
 718 #else
 719 #define AMBA_CONSOLE    NULL
 720 #endif
 721
 722 static struct uart_driver amba_reg = {
 723         .owner                  = THIS_MODULE,
 724         .driver_name            = "ttyAM",
 725         .dev_name               = "ttyAM",
 726         .major                  = SERIAL_AMBA_MAJOR,
 727         .minor                  = SERIAL_AMBA_MINOR,
 728         .nr                     = UART_NR,
 729         .cons                   = AMBA_CONSOLE,
 730 };
 731
 732 static int pl010_probe(struct amba_device *dev, void *id)
 733 {
 734         int i;
 735
 736         for (i = 0; i < UART_NR; i++) {
 737                 if (amba_ports[i].port.mapbase != dev->res.start)
 738                         continue;
 739
 740                 amba_ports[i].port.dev = &dev->dev;
 741                 uart_add_one_port(&amba_reg, &amba_ports[i].port);
 742                 amba_set_drvdata(dev, &amba_ports[i]);
 743                 break;
 744         }
 745
 746         return 0;
 747 }
 748
 749 static int pl010_remove(struct amba_device *dev)
 750 {
 751         struct uart_amba_port *uap = amba_get_drvdata(dev);
 752
 753         if (uap)
 754                 uart_remove_one_port(&amba_reg, &uap->port);
 755
 756         amba_set_drvdata(dev, NULL);
 757
 758         return 0;
 759 }
 760
 761 static int pl010_suspend(struct amba_device *dev, u32 state)
 762 {
 763         struct uart_amba_port *uap = amba_get_drvdata(dev);
 764
 765         if (uap)
 766                 uart_suspend_port(&amba_reg, &uap->port);
 767
 768         return 0;
 769 }
 770
 771 static int pl010_resume(struct amba_device *dev)
 772 {
 773         struct uart_amba_port *uap = amba_get_drvdata(dev);
 774
 775         if (uap)
 776                 uart_resume_port(&amba_reg, &uap->port);
 777
 778         return 0;
 779 }
 780
 781 static struct amba_id pl010_ids[] __initdata = {
 782         {
 783                 .id     = 0x00041010,
 784                 .mask   = 0x000fffff,
 785         },
 786         { 0, 0 },
 787 };
 788
 789 static struct amba_driver pl010_driver = {
 790         .drv = {
 791                 .name   = "uart-pl010",
 792         },
 793         .id_table       = pl010_ids,
 794         .probe          = pl010_probe,
 795         .remove         = pl010_remove,
 796         .suspend        = pl010_suspend,
 797         .resume         = pl010_resume,
 798 };
 799
 800 static int __init pl010_init(void)
 801 {
 802         int ret;
 803
 804         printk(KERN_INFO "Serial: AMBA driver $Revision: 1.41 $\n");
 805
 806         ret = uart_register_driver(&amba_reg);
 807         if (ret == 0) {
 808                 ret = amba_driver_register(&pl010_driver);
 809                 if (ret)
 810                         uart_unregister_driver(&amba_reg);
 811         }
 812         return ret;
 813 }
 814
 815 static void __exit pl010_exit(void)
 816 {
 817         amba_driver_unregister(&pl010_driver);
 818         uart_unregister_driver(&amba_reg);
 819 }
 820
 821 module_init(pl010_init);
 822 module_exit(pl010_exit);
 823
 824 MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
 825 MODULE_DESCRIPTION("ARM AMBA serial port driver $Revision: 1.41 $");
 826 MODULE_LICENSE("GPL");