drivers/serial/uart00.c

   1 /*
   2  *  linux/drivers/serial/uart00.c
   3  *
   4  *  Driver for UART00 serial ports
   5  *
   6  *  Based on drivers/char/serial_amba.c, by ARM Limited &
   7  *                                          Deep Blue Solutions Ltd.
   8  *  Copyright 2001 Altera Corporation
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  *  $Id: uart00.c,v 1.35 2002/07/28 10:03:28 rmk Exp $
  25  *
  26  */
  27 #include <linux/config.h>
  28 #include <linux/module.h>
  29 #include <linux/tty.h>
  30 #include <linux/ioport.h>
  31 #include <linux/init.h>
  32 #include <linux/serial.h>
  33 #include <linux/console.h>
  34 #include <linux/sysrq.h>
  35 #include <linux/pld/pld_hotswap.h>
  36
  37 #include <asm/io.h>
  38 #include <asm/irq.h>
  39 #include <asm/sizes.h>
  40
  41 #if defined(CONFIG_SERIAL_UART00_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  42 #define SUPPORT_SYSRQ
  43 #endif
  44
  45 #include <linux/serial_core.h>
  46 #include <asm/arch/excalibur.h>
  47 #define UART00_TYPE (volatile unsigned int*)
  48 #include <asm/arch/uart00.h>
  49 #include <asm/arch/int_ctrl00.h>
  50
  51 #define UART_NR         2
  52
  53 #define SERIAL_UART00_NAME      "ttyUA"
  54 #define SERIAL_UART00_MAJOR     204
  55 #define SERIAL_UART00_MINOR     16      /* Temporary - will change in future */
  56 #define SERIAL_UART00_NR        UART_NR
  57 #define UART_PORT_SIZE 0x50
  58
  59 #define UART00_ISR_PASS_LIMIT   256
  60
  61 /*
  62  * Access macros for the UART00 UARTs
  63  */
  64 #define UART_GET_INT_STATUS(p)  inl(UART_ISR((p)->membase))
  65 #define UART_PUT_IES(p, c)      outl(c,UART_IES((p)->membase))
  66 #define UART_GET_IES(p)         inl(UART_IES((p)->membase))
  67 #define UART_PUT_IEC(p, c)      outl(c,UART_IEC((p)->membase))
  68 #define UART_GET_IEC(p)         inl(UART_IEC((p)->membase))
  69 #define UART_PUT_CHAR(p, c)     outl(c,UART_TD((p)->membase))
  70 #define UART_GET_CHAR(p)        inl(UART_RD((p)->membase))
  71 #define UART_GET_RSR(p)         inl(UART_RSR((p)->membase))
  72 #define UART_GET_RDS(p)         inl(UART_RDS((p)->membase))
  73 #define UART_GET_MSR(p)         inl(UART_MSR((p)->membase))
  74 #define UART_GET_MCR(p)         inl(UART_MCR((p)->membase))
  75 #define UART_PUT_MCR(p, c)      outl(c,UART_MCR((p)->membase))
  76 #define UART_GET_MC(p)          inl(UART_MC((p)->membase))
  77 #define UART_PUT_MC(p, c)       outl(c,UART_MC((p)->membase))
  78 #define UART_GET_TSR(p)         inl(UART_TSR((p)->membase))
  79 #define UART_GET_DIV_HI(p)      inl(UART_DIV_HI((p)->membase))
  80 #define UART_PUT_DIV_HI(p,c)    outl(c,UART_DIV_HI((p)->membase))
  81 #define UART_GET_DIV_LO(p)      inl(UART_DIV_LO((p)->membase))
  82 #define UART_PUT_DIV_LO(p,c)    outl(c,UART_DIV_LO((p)->membase))
  83 #define UART_RX_DATA(s)         ((s) & UART_RSR_RX_LEVEL_MSK)
  84 #define UART_TX_READY(s)        (((s) & UART_TSR_TX_LEVEL_MSK) < 15)
  85 //#define UART_TX_EMPTY(p)      ((UART_GET_FR(p) & UART00_UARTFR_TMSK) == 0)
  86
  87 static void uart00_stop_tx(struct uart_port *port, unsigned int tty_stop)
  88 {
  89         UART_PUT_IEC(port, UART_IEC_TIE_MSK);
  90 }
  91
  92 static void uart00_stop_rx(struct uart_port *port)
  93 {
  94         UART_PUT_IEC(port, UART_IEC_RE_MSK);
  95 }
  96
  97 static void uart00_enable_ms(struct uart_port *port)
  98 {
  99         UART_PUT_IES(port, UART_IES_ME_MSK);
 100 }
 101
 102 static void
 103 uart00_rx_chars(struct uart_port *port, struct pt_regs *regs)
 104 {
 105         struct tty_struct *tty = port->info->tty;
 106         unsigned int status, ch, rds, flg, ignored = 0;
 107
 108         status = UART_GET_RSR(port);
 109         while (UART_RX_DATA(status)) {
 110                 /*
 111                  * We need to read rds before reading the
 112                  * character from the fifo
 113                  */
 114                 rds = UART_GET_RDS(port);
 115                 ch = UART_GET_CHAR(port);
 116                 port->icount.rx++;
 117
 118                 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
 119                         goto ignore_char;
 120
 121                 flg = TTY_NORMAL;
 122
 123                 /*
 124                  * Note that the error handling code is
 125                  * out of the main execution path
 126                  */
 127                 if (rds & (UART_RDS_BI_MSK |UART_RDS_FE_MSK|
 128                            UART_RDS_PE_MSK |UART_RDS_PE_MSK))
 129                         goto handle_error;
 130                 if (uart_handle_sysrq_char(port, ch, regs))
 131                         goto ignore_char;
 132
 133         error_return:
 134                 *tty->flip.flag_buf_ptr++ = flg;
 135                 *tty->flip.char_buf_ptr++ = ch;
 136                 tty->flip.count++;
 137         ignore_char:
 138                 status = UART_GET_RSR(port);
 139         }
 140  out:
 141         tty_flip_buffer_push(tty);
 142         return;
 143
 144  handle_error:
 145         if (rds & UART_RDS_BI_MSK) {
 146                 status &= ~(UART_RDS_FE_MSK | UART_RDS_PE_MSK);
 147                 port->icount.brk++;
 148                 if (uart_handle_break(port))
 149                         goto ignore_char;
 150         } else if (rds & UART_RDS_PE_MSK)
 151                 port->icount.parity++;
 152         else if (rds & UART_RDS_FE_MSK)
 153                 port->icount.frame++;
 154         if (rds & UART_RDS_OE_MSK)
 155                 port->icount.overrun++;
 156
 157         if (rds & port->ignore_status_mask) {
 158                 if (++ignored > 100)
 159                         goto out;
 160                 goto ignore_char;
 161         }
 162         rds &= port->read_status_mask;
 163
 164         if (rds & UART_RDS_BI_MSK)
 165                 flg = TTY_BREAK;
 166         else if (rds & UART_RDS_PE_MSK)
 167                 flg = TTY_PARITY;
 168         else if (rds & UART_RDS_FE_MSK)
 169                 flg = TTY_FRAME;
 170
 171         if (rds & UART_RDS_OE_MSK) {
 172                 /*
 173                  * CHECK: does overrun affect the current character?
 174                  * ASSUMPTION: it does not.
 175                  */
 176                 *tty->flip.flag_buf_ptr++ = flg;
 177                 *tty->flip.char_buf_ptr++ = ch;
 178                 tty->flip.count++;
 179                 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
 180                         goto ignore_char;
 181                 ch = 0;
 182                 flg = TTY_OVERRUN;
 183         }
 184 #ifdef SUPPORT_SYSRQ
 185         port->sysrq = 0;
 186 #endif
 187         goto error_return;
 188 }
 189
 190 static void uart00_tx_chars(struct uart_port *port)
 191 {
 192         struct circ_buf *xmit = &port->info->xmit;
 193         int count;
 194
 195         if (port->x_char) {
 196                 while ((UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK) == 15)
 197                         barrier();
 198                 UART_PUT_CHAR(port, port->x_char);
 199                 port->icount.tx++;
 200                 port->x_char = 0;
 201                 return;
 202         }
 203         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 204                 uart00_stop_tx(port, 0);
 205                 return;
 206         }
 207
 208         count = port->fifosize >> 1;
 209         do {
 210                 while ((UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK) == 15)
 211                         barrier();
 212                 UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
 213                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 214                 port->icount.tx++;
 215                 if (uart_circ_empty(xmit))
 216                         break;
 217         } while (--count > 0);
 218
 219         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 220                 uart_write_wakeup(port);
 221
 222         if (uart_circ_empty(xmit))
 223                 uart00_stop_tx(port, 0);
 224 }
 225
 226 static void uart00_start_tx(struct uart_port *port, unsigned int tty_start)
 227 {
 228         UART_PUT_IES(port, UART_IES_TIE_MSK);
 229         uart00_tx_chars(port);
 230 }
 231
 232 static void uart00_modem_status(struct uart_port *port)
 233 {
 234         unsigned int status;
 235
 236         status = UART_GET_MSR(port);
 237
 238         if (!(status & (UART_MSR_DCTS_MSK | UART_MSR_DDSR_MSK |
 239                         UART_MSR_TERI_MSK | UART_MSR_DDCD_MSK)))
 240                 return;
 241
 242         if (status & UART_MSR_DDCD_MSK)
 243                 uart_handle_dcd_change(port, status & UART_MSR_DCD_MSK);
 244
 245         if (status & UART_MSR_DDSR_MSK)
 246                 port->icount.dsr++;
 247
 248         if (status & UART_MSR_DCTS_MSK)
 249                 uart_handle_cts_change(port, status & UART_MSR_CTS_MSK);
 250
 251         wake_up_interruptible(&port->info->delta_msr_wait);
 252 }
 253
 254 static void uart00_int(int irq, void *dev_id, struct pt_regs *regs)
 255 {
 256         struct uart_port *port = dev_id;
 257         unsigned int status, pass_counter = 0;
 258
 259         status = UART_GET_INT_STATUS(port);
 260         do {
 261                 if (status & UART_ISR_RI_MSK)
 262                         uart00_rx_chars(port, regs);
 263                 if (status & UART_ISR_MI_MSK)
 264                         uart00_modem_status(port);
 265                 if (status & (UART_ISR_TI_MSK | UART_ISR_TII_MSK))
 266                         uart00_tx_chars(port);
 267                 if (pass_counter++ > UART00_ISR_PASS_LIMIT)
 268                         break;
 269
 270                 status = UART_GET_INT_STATUS(port);
 271         } while (status);
 272 }
 273
 274 static unsigned int uart00_tx_empty(struct uart_port *port)
 275 {
 276         return UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK? 0 : TIOCSER_TEMT;
 277 }
 278
 279 static unsigned int uart00_get_mctrl(struct uart_port *port)
 280 {
 281         unsigned int result = 0;
 282         unsigned int status;
 283
 284         status = UART_GET_MSR(port);
 285         if (status & UART_MSR_DCD_MSK)
 286                 result |= TIOCM_CAR;
 287         if (status & UART_MSR_DSR_MSK)
 288                 result |= TIOCM_DSR;
 289         if (status & UART_MSR_CTS_MSK)
 290                 result |= TIOCM_CTS;
 291         if (status & UART_MSR_RI_MSK)
 292                 result |= TIOCM_RI;
 293
 294         return result;
 295 }
 296
 297 static void uart00_set_mctrl_null(struct uart_port *port, unsigned int mctrl)
 298 {
 299 }
 300
 301 static void uart00_break_ctl(struct uart_port *port, int break_state)
 302 {
 303         unsigned long flags;
 304         unsigned int mcr;
 305
 306         spin_lock_irqsave(&port->lock, flags);
 307         mcr = UART_GET_MCR(port);
 308         if (break_state == -1)
 309                 mcr |= UART_MCR_BR_MSK;
 310         else
 311                 mcr &= ~UART_MCR_BR_MSK;
 312         UART_PUT_MCR(port, mcr);
 313         spin_unlock_irqrestore(&port->lock, flags);
 314 }
 315
 316 static void
 317 uart00_set_termios(struct uart_port *port, struct termios *termios,
 318                    struct termios *old)
 319 {
 320         unsigned int uart_mc, old_ies, baud, quot;
 321         unsigned long flags;
 322
 323         /*
 324          * We don't support CREAD (yet)
 325          */
 326         termios->c_cflag |= CREAD;
 327
 328         /*
 329          * Ask the core to calculate the divisor for us.
 330          */
 331         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 332         quot = uart_get_divisor(port, baud);
 333
 334         /* byte size and parity */
 335         switch (termios->c_cflag & CSIZE) {
 336         case CS5:
 337                 uart_mc = UART_MC_CLS_CHARLEN_5;
 338                 break;
 339         case CS6:
 340                 uart_mc = UART_MC_CLS_CHARLEN_6;
 341                 break;
 342         case CS7:
 343                 uart_mc = UART_MC_CLS_CHARLEN_7;
 344                 break;
 345         default: // CS8
 346                 uart_mc = UART_MC_CLS_CHARLEN_8;
 347                 break;
 348         }
 349         if (termios->c_cflag & CSTOPB)
 350                 uart_mc|= UART_MC_ST_TWO;
 351         if (termios->c_cflag & PARENB) {
 352                 uart_mc |= UART_MC_PE_MSK;
 353                 if (!(termios->c_cflag & PARODD))
 354                         uart_mc |= UART_MC_EP_MSK;
 355         }
 356
 357         spin_lock_irqsave(&port->lock, flags);
 358
 359         /*
 360          * Update the per-port timeout.
 361          */
 362         uart_update_timeout(port, termios->c_cflag, baud);
 363
 364         port->read_status_mask = UART_RDS_OE_MSK;
 365         if (termios->c_iflag & INPCK)
 366                 port->read_status_mask |= UART_RDS_FE_MSK | UART_RDS_PE_MSK;
 367         if (termios->c_iflag & (BRKINT | PARMRK))
 368                 port->read_status_mask |= UART_RDS_BI_MSK;
 369
 370         /*
 371          * Characters to ignore
 372          */
 373         port->ignore_status_mask = 0;
 374         if (termios->c_iflag & IGNPAR)
 375                 port->ignore_status_mask |= UART_RDS_FE_MSK | UART_RDS_PE_MSK;
 376         if (termios->c_iflag & IGNBRK) {
 377                 port->ignore_status_mask |= UART_RDS_BI_MSK;
 378                 /*
 379                  * If we're ignoring parity and break indicators,
 380                  * ignore overruns to (for real raw support).
 381                  */
 382                 if (termios->c_iflag & IGNPAR)
 383                         port->ignore_status_mask |= UART_RDS_OE_MSK;
 384         }
 385
 386         /* first, disable everything */
 387         old_ies = UART_GET_IES(port);
 388
 389         if (UART_ENABLE_MS(port, termios->c_cflag))
 390                 old_ies |= UART_IES_ME_MSK;
 391
 392         /* Set baud rate */
 393         UART_PUT_DIV_LO(port, (quot & 0xff));
 394         UART_PUT_DIV_HI(port, ((quot & 0xf00) >> 8));
 395
 396         UART_PUT_MC(port, uart_mc);
 397         UART_PUT_IES(port, old_ies);
 398
 399         spin_unlock_irqrestore(&port->lock, flags);
 400 }
 401
 402 static int uart00_startup(struct uart_port *port)
 403 {
 404         int result;
 405
 406         /*
 407          * Allocate the IRQ
 408          */
 409         result = request_irq(port->irq, uart00_int, 0, "uart00", port);
 410         if (result) {
 411                 printk(KERN_ERR "Request of irq %d failed\n", port->irq);
 412                 return result;
 413         }
 414
 415         /*
 416          * Finally, enable interrupts. Use the TII interrupt to minimise
 417          * the number of interrupts generated. If higher performance is
 418          * needed, consider using the TI interrupt with a suitable FIFO
 419          * threshold
 420          */
 421         UART_PUT_IES(port, UART_IES_RE_MSK | UART_IES_TIE_MSK);
 422
 423         return 0;
 424 }
 425
 426 static void uart00_shutdown(struct uart_port *port)
 427 {
 428         /*
 429          * disable all interrupts, disable the port
 430          */
 431         UART_PUT_IEC(port, 0xff);
 432
 433         /* disable break condition and fifos */
 434         UART_PUT_MCR(port, UART_GET_MCR(port) &~UART_MCR_BR_MSK);
 435
 436         /*
 437          * Free the interrupt
 438          */
 439         free_irq(port->irq, port);
 440 }
 441
 442 static const char *uart00_type(struct uart_port *port)
 443 {
 444         return port->type == PORT_UART00 ? "Altera UART00" : NULL;
 445 }
 446
 447 /*
 448  * Release the memory region(s) being used by 'port'
 449  */
 450 static void uart00_release_port(struct uart_port *port)
 451 {
 452         release_mem_region(port->mapbase, UART_PORT_SIZE);
 453
 454 #ifdef CONFIG_ARCH_CAMELOT
 455         if (port->membase != (void*)IO_ADDRESS(EXC_UART00_BASE)) {
 456                 iounmap(port->membase);
 457         }
 458 #endif
 459 }
 460
 461 /*
 462  * Request the memory region(s) being used by 'port'
 463  */
 464 static int uart00_request_port(struct uart_port *port)
 465 {
 466         return request_mem_region(port->mapbase, UART_PORT_SIZE, "serial_uart00")
 467                         != NULL ? 0 : -EBUSY;
 468 }
 469
 470 /*
 471  * Configure/autoconfigure the port.
 472  */
 473 static void uart00_config_port(struct uart_port *port, int flags)
 474 {
 475
 476         /*
 477          * Map the io memory if this is a soft uart
 478          */
 479         if (!port->membase)
 480                 port->membase = ioremap_nocache(port->mapbase,SZ_4K);
 481
 482         if (!port->membase)
 483                 printk(KERN_ERR "serial00: cannot map io memory\n");
 484         else
 485                 port->type = PORT_UART00;
 486
 487 }
 488
 489 /*
 490  * verify the new serial_struct (for TIOCSSERIAL).
 491  */
 492 static int uart00_verify_port(struct uart_port *port, struct serial_struct *ser)
 493 {
 494         int ret = 0;
 495         if (ser->type != PORT_UNKNOWN && ser->type != PORT_UART00)
 496                 ret = -EINVAL;
 497         if (ser->irq < 0 || ser->irq >= NR_IRQS)
 498                 ret = -EINVAL;
 499         if (ser->baud_base < 9600)
 500                 ret = -EINVAL;
 501         return ret;
 502 }
 503
 504 static struct uart_ops uart00_pops = {
 505         .tx_empty       = uart00_tx_empty,
 506         .set_mctrl      = uart00_set_mctrl_null,
 507         .get_mctrl      = uart00_get_mctrl,
 508         .stop_tx        = uart00_stop_tx,
 509         .start_tx       = uart00_start_tx,
 510         .stop_rx        = uart00_stop_rx,
 511         .enable_ms      = uart00_enable_ms,
 512         .break_ctl      = uart00_break_ctl,
 513         .startup        = uart00_startup,
 514         .shutdown       = uart00_shutdown,
 515         .set_termios    = uart00_set_termios,
 516         .type           = uart00_type,
 517         .release_port   = uart00_release_port,
 518         .request_port   = uart00_request_port,
 519         .config_port    = uart00_config_port,
 520         .verify_port    = uart00_verify_port,
 521 };
 522
 523
 524 #ifdef CONFIG_ARCH_CAMELOT
 525 static struct uart_port epxa10db_port = {
 526         .membase        = (void*)IO_ADDRESS(EXC_UART00_BASE),
 527         .mapbase        = EXC_UART00_BASE,
 528         .iotype         = SERIAL_IO_MEM,
 529         .irq            = IRQ_UART,
 530         .uartclk        = EXC_AHB2_CLK_FREQUENCY,
 531         .fifosize       = 16,
 532         .ops            = &uart00_pops,
 533         .flags          = ASYNC_BOOT_AUTOCONF,
 534 };
 535 #endif
 536
 537
 538 #ifdef CONFIG_SERIAL_UART00_CONSOLE
 539 static void uart00_console_write(struct console *co, const char *s, unsigned count)
 540 {
 541 #ifdef CONFIG_ARCH_CAMELOT
 542         struct uart_port *port = &epxa10db_port;
 543         unsigned int status, old_ies;
 544         int i;
 545
 546         /*
 547          *      First save the CR then disable the interrupts
 548          */
 549         old_ies = UART_GET_IES(port);
 550         UART_PUT_IEC(port,0xff);
 551
 552         /*
 553          *      Now, do each character
 554          */
 555         for (i = 0; i < count; i++) {
 556                 do {
 557                         status = UART_GET_TSR(port);
 558                 } while (!UART_TX_READY(status));
 559                 UART_PUT_CHAR(port, s[i]);
 560                 if (s[i] == '\n') {
 561                         do {
 562                                 status = UART_GET_TSR(port);
 563                         } while (!UART_TX_READY(status));
 564                         UART_PUT_CHAR(port, '\r');
 565                 }
 566         }
 567
 568         /*
 569          *      Finally, wait for transmitter to become empty
 570          *      and restore the IES
 571          */
 572         do {
 573                 status = UART_GET_TSR(port);
 574         } while (status & UART_TSR_TX_LEVEL_MSK);
 575         UART_PUT_IES(port, old_ies);
 576 #endif
 577 }
 578
 579 static void __init
 580 uart00_console_get_options(struct uart_port *port, int *baud,
 581                            int *parity, int *bits)
 582 {
 583         unsigned int uart_mc, quot;
 584
 585         uart_mc = UART_GET_MC(port);
 586
 587         *parity = 'n';
 588         if (uart_mc & UART_MC_PE_MSK) {
 589                 if (uart_mc & UART_MC_EP_MSK)
 590                         *parity = 'e';
 591                 else
 592                         *parity = 'o';
 593         }
 594
 595         switch (uart_mc & UART_MC_CLS_MSK) {
 596         case UART_MC_CLS_CHARLEN_5:
 597                 *bits = 5;
 598                 break;
 599         case UART_MC_CLS_CHARLEN_6:
 600                 *bits = 6;
 601                 break;
 602         case UART_MC_CLS_CHARLEN_7:
 603                 *bits = 7;
 604                 break;
 605         case UART_MC_CLS_CHARLEN_8:
 606                 *bits = 8;
 607                 break;
 608         }
 609         quot = UART_GET_DIV_LO(port) | (UART_GET_DIV_HI(port) << 8);
 610         *baud = port->uartclk / (16 *quot );
 611 }
 612
 613 static int __init uart00_console_setup(struct console *co, char *options)
 614 {
 615         struct uart_port *port;
 616         int baud = 38400;
 617         int bits = 8;
 618         int parity = 'n';
 619         int flow = 'n';
 620
 621 #ifdef CONFIG_ARCH_CAMELOT
 622         port = &epxa10db_port;             ;
 623 #else
 624         return -ENODEV;
 625 #endif
 626         if (options)
 627                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 628         else
 629                 uart00_console_get_options(port, &baud, &parity, &bits);
 630
 631         return uart_set_options(port, co, baud, parity, bits, flow);
 632 }
 633
 634 extern struct uart_driver uart00_reg;
 635 static struct console uart00_console = {
 636         .name           = SERIAL_UART00_NAME,
 637         .write          = uart00_console_write,
 638         .device         = uart_console_device,
 639         .setup          = uart00_console_setup,
 640         .flags          = CON_PRINTBUFFER,
 641         .index          = 0,
 642         .data           = &uart00_reg;
 643 };
 644
 645 static int __init uart00_console_init(void)
 646 {
 647         register_console(&uart00_console);
 648         return 0;
 649 }
 650 console_initcall(uart00_console_init);
 651
 652 #define UART00_CONSOLE  &uart00_console
 653 #else
 654 #define UART00_CONSOLE  NULL
 655 #endif
 656
 657 static struct uart_driver uart00_reg = {
 658         .owner                  = NULL,
 659         .driver_name            = SERIAL_UART00_NAME,
 660         .dev_name               = SERIAL_UART00_NAME,
 661         .major                  = SERIAL_UART00_MAJOR,
 662         .minor                  = SERIAL_UART00_MINOR,
 663         .nr                     = UART_NR,
 664         .cons                   = UART00_CONSOLE,
 665 };
 666
 667 struct dev_port_entry{
 668         unsigned int base_addr;
 669         struct uart_port *port;
 670 };
 671
 672 static struct dev_port_entry dev_port_map[UART_NR];
 673
 674 #ifdef CONFIG_PLD_HOTSWAP
 675 /*
 676  * Keep a mapping of dev_info addresses -> port lines to use when
 677  * removing ports dev==NULL indicates unused entry
 678  */
 679
 680 struct uart00_ps_data{
 681         unsigned int clk;
 682         unsigned int fifosize;
 683 };
 684
 685 int uart00_add_device(struct pldhs_dev_info* dev_info, void* dev_ps_data)
 686 {
 687         struct uart00_ps_data* dev_ps=dev_ps_data;
 688         struct uart_port * port;
 689         int i,result;
 690
 691         i=0;
 692         while(dev_port_map[i].port)
 693                 i++;
 694
 695         if(i==UART_NR){
 696                 printk(KERN_WARNING "uart00: Maximum number of ports reached\n");
 697                 return 0;
 698         }
 699
 700         port=kmalloc(sizeof(struct uart_port),GFP_KERNEL);
 701         if(!port)
 702                 return -ENOMEM;
 703
 704         printk("clk=%d fifo=%d\n",dev_ps->clk,dev_ps->fifosize);
 705         port->membase=0;
 706         port->mapbase=dev_info->base_addr;
 707         port->iotype=SERIAL_IO_MEM;
 708         port->irq=dev_info->irq;
 709         port->uartclk=dev_ps->clk;
 710         port->fifosize=dev_ps->fifosize;
 711         port->ops=&uart00_pops;
 712         port->line=i;
 713         port->flags=ASYNC_BOOT_AUTOCONF;
 714
 715         result=uart_add_one_port(&uart00_reg, port);
 716         if(result){
 717                 printk("uart_add_one_port returned %d\n",result);
 718                 return result;
 719         }
 720         dev_port_map[i].base_addr=dev_info->base_addr;
 721         dev_port_map[i].port=port;
 722         printk("uart00: added device at %x as ttyUA%d\n",dev_port_map[i].base_addr,i);
 723         return 0;
 724
 725 }
 726
 727 int uart00_remove_devices(void)
 728 {
 729         int i,result;
 730
 731
 732         result=0;
 733         for(i=1;i<UART_NR;i++){
 734                 if(dev_port_map[i].base_addr){
 735                         result=uart_remove_one_port(&uart00_reg, dev_port_map[i].port);
 736                         if(result)
 737                                 return result;
 738
 739                         /* port removed sucessfully, so now tidy up */
 740                         kfree(dev_port_map[i].port);
 741                         dev_port_map[i].base_addr=0;
 742                         dev_port_map[i].port=NULL;
 743                 }
 744         }
 745         return 0;
 746
 747 }
 748
 749 struct pld_hotswap_ops uart00_pldhs_ops={
 750         .name           = "uart00",
 751         .add_device     = uart00_add_device,
 752         .remove_devices = uart00_remove_devices,
 753 };
 754
 755 #endif
 756
 757 static int __init uart00_init(void)
 758 {
 759         int result;
 760
 761         printk(KERN_INFO "Serial: UART00 driver $Revision: 1.35 $\n");
 762
 763         printk(KERN_WARNING "serial_uart00:Using temporary major/minor pairs"
 764                 " - these WILL change in the future\n");
 765
 766         result = uart_register_driver(&uart00_reg);
 767         if (result)
 768                 return result;
 769 #ifdef CONFIG_ARCH_CAMELOT
 770         result = uart_add_one_port(&uart00_reg,&epxa10db_port);
 771 #endif
 772         if (result)
 773                 uart_unregister_driver(&uart00_reg);
 774
 775 #ifdef  CONFIG_PLD_HOTSWAP
 776         pldhs_register_driver(&uart00_pldhs_ops);
 777 #endif
 778         return result;
 779 }
 780
 781 __initcall(uart00_init);