drivers/tty/serial/mcf.c

   1 /****************************************************************************/
   2
   3 /*
   4  *      mcf.c -- Freescale ColdFire UART driver
   5  *
   6  *      (C) Copyright 2003-2007, Greg Ungerer <gerg@uclinux.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 /****************************************************************************/
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/module.h>
  20 #include <linux/console.h>
  21 #include <linux/tty.h>
  22 #include <linux/tty_flip.h>
  23 #include <linux/serial.h>
  24 #include <linux/serial_core.h>
  25 #include <linux/io.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/platform_device.h>
  28 #include <asm/coldfire.h>
  29 #include <asm/mcfsim.h>
  30 #include <asm/mcfuart.h>
  31 #include <asm/nettel.h>
  32
  33 /****************************************************************************/
  34
  35 /*
  36  *      Some boards implement the DTR/DCD lines using GPIO lines, most
  37  *      don't. Dummy out the access macros for those that don't. Those
  38  *      that do should define these macros somewhere in there board
  39  *      specific inlude files.
  40  */
  41 #if !defined(mcf_getppdcd)
  42 #define mcf_getppdcd(p)         (1)
  43 #endif
  44 #if !defined(mcf_getppdtr)
  45 #define mcf_getppdtr(p)         (1)
  46 #endif
  47 #if !defined(mcf_setppdtr)
  48 #define mcf_setppdtr(p, v)      do { } while (0)
  49 #endif
  50
  51 /****************************************************************************/
  52
  53 /*
  54  *      Local per-uart structure.
  55  */
  56 struct mcf_uart {
  57         struct uart_port        port;
  58         unsigned int            sigs;           /* Local copy of line sigs */
  59         unsigned char           imr;            /* Local IMR mirror */
  60 };
  61
  62 /****************************************************************************/
  63
  64 static unsigned int mcf_tx_empty(struct uart_port *port)
  65 {
  66         return (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXEMPTY) ?
  67                 TIOCSER_TEMT : 0;
  68 }
  69
  70 /****************************************************************************/
  71
  72 static unsigned int mcf_get_mctrl(struct uart_port *port)
  73 {
  74         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
  75         unsigned int sigs;
  76
  77         sigs = (readb(port->membase + MCFUART_UIPR) & MCFUART_UIPR_CTS) ?
  78                 0 : TIOCM_CTS;
  79         sigs |= (pp->sigs & TIOCM_RTS);
  80         sigs |= (mcf_getppdcd(port->line) ? TIOCM_CD : 0);
  81         sigs |= (mcf_getppdtr(port->line) ? TIOCM_DTR : 0);
  82
  83         return sigs;
  84 }
  85
  86 /****************************************************************************/
  87
  88 static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs)
  89 {
  90         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
  91
  92         pp->sigs = sigs;
  93         mcf_setppdtr(port->line, (sigs & TIOCM_DTR));
  94         if (sigs & TIOCM_RTS)
  95                 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
  96         else
  97                 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP0);
  98 }
  99
 100 /****************************************************************************/
 101
 102 static void mcf_start_tx(struct uart_port *port)
 103 {
 104         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 105
 106         if (port->rs485.flags & SER_RS485_ENABLED) {
 107                 /* Enable Transmitter */
 108                 writeb(MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR);
 109                 /* Manually assert RTS */
 110                 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
 111         }
 112         pp->imr |= MCFUART_UIR_TXREADY;
 113         writeb(pp->imr, port->membase + MCFUART_UIMR);
 114 }
 115
 116 /****************************************************************************/
 117
 118 static void mcf_stop_tx(struct uart_port *port)
 119 {
 120         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 121
 122         pp->imr &= ~MCFUART_UIR_TXREADY;
 123         writeb(pp->imr, port->membase + MCFUART_UIMR);
 124 }
 125
 126 /****************************************************************************/
 127
 128 static void mcf_stop_rx(struct uart_port *port)
 129 {
 130         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 131
 132         pp->imr &= ~MCFUART_UIR_RXREADY;
 133         writeb(pp->imr, port->membase + MCFUART_UIMR);
 134 }
 135
 136 /****************************************************************************/
 137
 138 static void mcf_break_ctl(struct uart_port *port, int break_state)
 139 {
 140         unsigned long flags;
 141
 142         spin_lock_irqsave(&port->lock, flags);
 143         if (break_state == -1)
 144                 writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR);
 145         else
 146                 writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR);
 147         spin_unlock_irqrestore(&port->lock, flags);
 148 }
 149
 150 /****************************************************************************/
 151
 152 static int mcf_startup(struct uart_port *port)
 153 {
 154         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 155         unsigned long flags;
 156
 157         spin_lock_irqsave(&port->lock, flags);
 158
 159         /* Reset UART, get it into known state... */
 160         writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
 161         writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
 162
 163         /* Enable the UART transmitter and receiver */
 164         writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
 165                 port->membase + MCFUART_UCR);
 166
 167         /* Enable RX interrupts now */
 168         pp->imr = MCFUART_UIR_RXREADY;
 169         writeb(pp->imr, port->membase + MCFUART_UIMR);
 170
 171         spin_unlock_irqrestore(&port->lock, flags);
 172
 173         return 0;
 174 }
 175
 176 /****************************************************************************/
 177
 178 static void mcf_shutdown(struct uart_port *port)
 179 {
 180         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 181         unsigned long flags;
 182
 183         spin_lock_irqsave(&port->lock, flags);
 184
 185         /* Disable all interrupts now */
 186         pp->imr = 0;
 187         writeb(pp->imr, port->membase + MCFUART_UIMR);
 188
 189         /* Disable UART transmitter and receiver */
 190         writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
 191         writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
 192
 193         spin_unlock_irqrestore(&port->lock, flags);
 194 }
 195
 196 /****************************************************************************/
 197
 198 static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
 199         struct ktermios *old)
 200 {
 201         unsigned long flags;
 202         unsigned int baud, baudclk;
 203 #if defined(CONFIG_M5272)
 204         unsigned int baudfr;
 205 #endif
 206         unsigned char mr1, mr2;
 207
 208         baud = uart_get_baud_rate(port, termios, old, 0, 230400);
 209 #if defined(CONFIG_M5272)
 210         baudclk = (MCF_BUSCLK / baud) / 32;
 211         baudfr = (((MCF_BUSCLK / baud) + 1) / 2) % 16;
 212 #else
 213         baudclk = ((MCF_BUSCLK / baud) + 16) / 32;
 214 #endif
 215
 216         mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
 217         mr2 = 0;
 218
 219         switch (termios->c_cflag & CSIZE) {
 220         case CS5: mr1 |= MCFUART_MR1_CS5; break;
 221         case CS6: mr1 |= MCFUART_MR1_CS6; break;
 222         case CS7: mr1 |= MCFUART_MR1_CS7; break;
 223         case CS8:
 224         default:  mr1 |= MCFUART_MR1_CS8; break;
 225         }
 226
 227         if (termios->c_cflag & PARENB) {
 228                 if (termios->c_cflag & CMSPAR) {
 229                         if (termios->c_cflag & PARODD)
 230                                 mr1 |= MCFUART_MR1_PARITYMARK;
 231                         else
 232                                 mr1 |= MCFUART_MR1_PARITYSPACE;
 233                 } else {
 234                         if (termios->c_cflag & PARODD)
 235                                 mr1 |= MCFUART_MR1_PARITYODD;
 236                         else
 237                                 mr1 |= MCFUART_MR1_PARITYEVEN;
 238                 }
 239         } else {
 240                 mr1 |= MCFUART_MR1_PARITYNONE;
 241         }
 242
 243         /*
 244          * FIXME: port->read_status_mask and port->ignore_status_mask
 245          * need to be initialized based on termios settings for
 246          * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
 247          */
 248
 249         if (termios->c_cflag & CSTOPB)
 250                 mr2 |= MCFUART_MR2_STOP2;
 251         else
 252                 mr2 |= MCFUART_MR2_STOP1;
 253
 254         if (termios->c_cflag & CRTSCTS) {
 255                 mr1 |= MCFUART_MR1_RXRTS;
 256                 mr2 |= MCFUART_MR2_TXCTS;
 257         }
 258
 259         spin_lock_irqsave(&port->lock, flags);
 260         if (port->rs485.flags & SER_RS485_ENABLED) {
 261                 dev_dbg(port->dev, "Setting UART to RS485\n");
 262                 mr2 |= MCFUART_MR2_TXRTS;
 263         }
 264
 265         uart_update_timeout(port, termios->c_cflag, baud);
 266         writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
 267         writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
 268         writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR);
 269         writeb(mr1, port->membase + MCFUART_UMR);
 270         writeb(mr2, port->membase + MCFUART_UMR);
 271         writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1);
 272         writeb((baudclk & 0xff), port->membase + MCFUART_UBG2);
 273 #if defined(CONFIG_M5272)
 274         writeb((baudfr & 0x0f), port->membase + MCFUART_UFPD);
 275 #endif
 276         writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER,
 277                 port->membase + MCFUART_UCSR);
 278         writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
 279                 port->membase + MCFUART_UCR);
 280         spin_unlock_irqrestore(&port->lock, flags);
 281 }
 282
 283 /****************************************************************************/
 284
 285 static void mcf_rx_chars(struct mcf_uart *pp)
 286 {
 287         struct uart_port *port = &pp->port;
 288         unsigned char status, ch, flag;
 289
 290         while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) {
 291                 ch = readb(port->membase + MCFUART_URB);
 292                 flag = TTY_NORMAL;
 293                 port->icount.rx++;
 294
 295                 if (status & MCFUART_USR_RXERR) {
 296                         writeb(MCFUART_UCR_CMDRESETERR,
 297                                 port->membase + MCFUART_UCR);
 298
 299                         if (status & MCFUART_USR_RXBREAK) {
 300                                 port->icount.brk++;
 301                                 if (uart_handle_break(port))
 302                                         continue;
 303                         } else if (status & MCFUART_USR_RXPARITY) {
 304                                 port->icount.parity++;
 305                         } else if (status & MCFUART_USR_RXOVERRUN) {
 306                                 port->icount.overrun++;
 307                         } else if (status & MCFUART_USR_RXFRAMING) {
 308                                 port->icount.frame++;
 309                         }
 310
 311                         status &= port->read_status_mask;
 312
 313                         if (status & MCFUART_USR_RXBREAK)
 314                                 flag = TTY_BREAK;
 315                         else if (status & MCFUART_USR_RXPARITY)
 316                                 flag = TTY_PARITY;
 317                         else if (status & MCFUART_USR_RXFRAMING)
 318                                 flag = TTY_FRAME;
 319                 }
 320
 321                 if (uart_handle_sysrq_char(port, ch))
 322                         continue;
 323                 uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
 324         }
 325
 326         spin_unlock(&port->lock);
 327         tty_flip_buffer_push(&port->state->port);
 328         spin_lock(&port->lock);
 329 }
 330
 331 /****************************************************************************/
 332
 333 static void mcf_tx_chars(struct mcf_uart *pp)
 334 {
 335         struct uart_port *port = &pp->port;
 336         struct circ_buf *xmit = &port->state->xmit;
 337
 338         if (port->x_char) {
 339                 /* Send special char - probably flow control */
 340                 writeb(port->x_char, port->membase + MCFUART_UTB);
 341                 port->x_char = 0;
 342                 port->icount.tx++;
 343                 return;
 344         }
 345
 346         while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
 347                 if (xmit->head == xmit->tail)
 348                         break;
 349                 writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
 350                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
 351                 port->icount.tx++;
 352         }
 353
 354         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 355                 uart_write_wakeup(port);
 356
 357         if (xmit->head == xmit->tail) {
 358                 pp->imr &= ~MCFUART_UIR_TXREADY;
 359                 writeb(pp->imr, port->membase + MCFUART_UIMR);
 360                 /* Disable TX to negate RTS automatically */
 361                 if (port->rs485.flags & SER_RS485_ENABLED)
 362                         writeb(MCFUART_UCR_TXDISABLE,
 363                                 port->membase + MCFUART_UCR);
 364         }
 365 }
 366
 367 /****************************************************************************/
 368
 369 static irqreturn_t mcf_interrupt(int irq, void *data)
 370 {
 371         struct uart_port *port = data;
 372         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 373         unsigned int isr;
 374         irqreturn_t ret = IRQ_NONE;
 375
 376         isr = readb(port->membase + MCFUART_UISR) & pp->imr;
 377
 378         spin_lock(&port->lock);
 379         if (isr & MCFUART_UIR_RXREADY) {
 380                 mcf_rx_chars(pp);
 381                 ret = IRQ_HANDLED;
 382         }
 383         if (isr & MCFUART_UIR_TXREADY) {
 384                 mcf_tx_chars(pp);
 385                 ret = IRQ_HANDLED;
 386         }
 387         spin_unlock(&port->lock);
 388
 389         return ret;
 390 }
 391
 392 /****************************************************************************/
 393
 394 static void mcf_config_port(struct uart_port *port, int flags)
 395 {
 396         port->type = PORT_MCF;
 397         port->fifosize = MCFUART_TXFIFOSIZE;
 398
 399         /* Clear mask, so no surprise interrupts. */
 400         writeb(0, port->membase + MCFUART_UIMR);
 401
 402         if (request_irq(port->irq, mcf_interrupt, 0, "UART", port))
 403                 printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
 404                         "interrupt vector=%d\n", port->line, port->irq);
 405 }
 406
 407 /****************************************************************************/
 408
 409 static const char *mcf_type(struct uart_port *port)
 410 {
 411         return (port->type == PORT_MCF) ? "ColdFire UART" : NULL;
 412 }
 413
 414 /****************************************************************************/
 415
 416 static int mcf_request_port(struct uart_port *port)
 417 {
 418         /* UARTs always present */
 419         return 0;
 420 }
 421
 422 /****************************************************************************/
 423
 424 static void mcf_release_port(struct uart_port *port)
 425 {
 426         /* Nothing to release... */
 427 }
 428
 429 /****************************************************************************/
 430
 431 static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
 432 {
 433         if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF))
 434                 return -EINVAL;
 435         return 0;
 436 }
 437
 438 /****************************************************************************/
 439
 440 /* Enable or disable the RS485 support */
 441 static int mcf_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
 442 {
 443         unsigned char mr1, mr2;
 444
 445         /* Get mode registers */
 446         mr1 = readb(port->membase + MCFUART_UMR);
 447         mr2 = readb(port->membase + MCFUART_UMR);
 448         if (rs485->flags & SER_RS485_ENABLED) {
 449                 dev_dbg(port->dev, "Setting UART to RS485\n");
 450                 /* Automatically negate RTS after TX completes */
 451                 mr2 |= MCFUART_MR2_TXRTS;
 452         } else {
 453                 dev_dbg(port->dev, "Setting UART to RS232\n");
 454                 mr2 &= ~MCFUART_MR2_TXRTS;
 455         }
 456         writeb(mr1, port->membase + MCFUART_UMR);
 457         writeb(mr2, port->membase + MCFUART_UMR);
 458         port->rs485 = *rs485;
 459
 460         return 0;
 461 }
 462
 463 /****************************************************************************/
 464
 465 /*
 466  *      Define the basic serial functions we support.
 467  */
 468 static const struct uart_ops mcf_uart_ops = {
 469         .tx_empty       = mcf_tx_empty,
 470         .get_mctrl      = mcf_get_mctrl,
 471         .set_mctrl      = mcf_set_mctrl,
 472         .start_tx       = mcf_start_tx,
 473         .stop_tx        = mcf_stop_tx,
 474         .stop_rx        = mcf_stop_rx,
 475         .break_ctl      = mcf_break_ctl,
 476         .startup        = mcf_startup,
 477         .shutdown       = mcf_shutdown,
 478         .set_termios    = mcf_set_termios,
 479         .type           = mcf_type,
 480         .request_port   = mcf_request_port,
 481         .release_port   = mcf_release_port,
 482         .config_port    = mcf_config_port,
 483         .verify_port    = mcf_verify_port,
 484 };
 485
 486 static struct mcf_uart mcf_ports[4];
 487
 488 #define MCF_MAXPORTS    ARRAY_SIZE(mcf_ports)
 489
 490 /****************************************************************************/
 491 #if defined(CONFIG_SERIAL_MCF_CONSOLE)
 492 /****************************************************************************/
 493
 494 int __init early_mcf_setup(struct mcf_platform_uart *platp)
 495 {
 496         struct uart_port *port;
 497         int i;
 498
 499         for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
 500                 port = &mcf_ports[i].port;
 501
 502                 port->line = i;
 503                 port->type = PORT_MCF;
 504                 port->mapbase = platp[i].mapbase;
 505                 port->membase = (platp[i].membase) ? platp[i].membase :
 506                         (unsigned char __iomem *) port->mapbase;
 507                 port->iotype = SERIAL_IO_MEM;
 508                 port->irq = platp[i].irq;
 509                 port->uartclk = MCF_BUSCLK;
 510                 port->flags = UPF_BOOT_AUTOCONF;
 511                 port->rs485_config = mcf_config_rs485;
 512                 port->ops = &mcf_uart_ops;
 513         }
 514
 515         return 0;
 516 }
 517
 518 /****************************************************************************/
 519
 520 static void mcf_console_putc(struct console *co, const char c)
 521 {
 522         struct uart_port *port = &(mcf_ports + co->index)->port;
 523         int i;
 524
 525         for (i = 0; (i < 0x10000); i++) {
 526                 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
 527                         break;
 528         }
 529         writeb(c, port->membase + MCFUART_UTB);
 530         for (i = 0; (i < 0x10000); i++) {
 531                 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
 532                         break;
 533         }
 534 }
 535
 536 /****************************************************************************/
 537
 538 static void mcf_console_write(struct console *co, const char *s, unsigned int count)
 539 {
 540         for (; (count); count--, s++) {
 541                 mcf_console_putc(co, *s);
 542                 if (*s == '\n')
 543                         mcf_console_putc(co, '\r');
 544         }
 545 }
 546
 547 /****************************************************************************/
 548
 549 static int __init mcf_console_setup(struct console *co, char *options)
 550 {
 551         struct uart_port *port;
 552         int baud = CONFIG_SERIAL_MCF_BAUDRATE;
 553         int bits = 8;
 554         int parity = 'n';
 555         int flow = 'n';
 556
 557         if ((co->index < 0) || (co->index >= MCF_MAXPORTS))
 558                 co->index = 0;
 559         port = &mcf_ports[co->index].port;
 560         if (port->membase == 0)
 561                 return -ENODEV;
 562
 563         if (options)
 564                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 565
 566         return uart_set_options(port, co, baud, parity, bits, flow);
 567 }
 568
 569 /****************************************************************************/
 570
 571 static struct uart_driver mcf_driver;
 572
 573 static struct console mcf_console = {
 574         .name           = "ttyS",
 575         .write          = mcf_console_write,
 576         .device         = uart_console_device,
 577         .setup          = mcf_console_setup,
 578         .flags          = CON_PRINTBUFFER,
 579         .index          = -1,
 580         .data           = &mcf_driver,
 581 };
 582
 583 static int __init mcf_console_init(void)
 584 {
 585         register_console(&mcf_console);
 586         return 0;
 587 }
 588
 589 console_initcall(mcf_console_init);
 590
 591 #define MCF_CONSOLE     &mcf_console
 592
 593 /****************************************************************************/
 594 #else
 595 /****************************************************************************/
 596
 597 #define MCF_CONSOLE     NULL
 598
 599 /****************************************************************************/
 600 #endif /* CONFIG_SERIAL_MCF_CONSOLE */
 601 /****************************************************************************/
 602
 603 /*
 604  *      Define the mcf UART driver structure.
 605  */
 606 static struct uart_driver mcf_driver = {
 607         .owner          = THIS_MODULE,
 608         .driver_name    = "mcf",
 609         .dev_name       = "ttyS",
 610         .major          = TTY_MAJOR,
 611         .minor          = 64,
 612         .nr             = MCF_MAXPORTS,
 613         .cons           = MCF_CONSOLE,
 614 };
 615
 616 /****************************************************************************/
 617
 618 static int mcf_probe(struct platform_device *pdev)
 619 {
 620         struct mcf_platform_uart *platp = dev_get_platdata(&pdev->dev);
 621         struct uart_port *port;
 622         int i;
 623
 624         for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
 625                 port = &mcf_ports[i].port;
 626
 627                 port->line = i;
 628                 port->type = PORT_MCF;
 629                 port->mapbase = platp[i].mapbase;
 630                 port->membase = (platp[i].membase) ? platp[i].membase :
 631                         (unsigned char __iomem *) platp[i].mapbase;
 632                 port->dev = &pdev->dev;
 633                 port->iotype = SERIAL_IO_MEM;
 634                 port->irq = platp[i].irq;
 635                 port->uartclk = MCF_BUSCLK;
 636                 port->ops = &mcf_uart_ops;
 637                 port->flags = UPF_BOOT_AUTOCONF;
 638                 port->rs485_config = mcf_config_rs485;
 639
 640                 uart_add_one_port(&mcf_driver, port);
 641         }
 642
 643         return 0;
 644 }
 645
 646 /****************************************************************************/
 647
 648 static int mcf_remove(struct platform_device *pdev)
 649 {
 650         struct uart_port *port;
 651         int i;
 652
 653         for (i = 0; (i < MCF_MAXPORTS); i++) {
 654                 port = &mcf_ports[i].port;
 655                 if (port)
 656                         uart_remove_one_port(&mcf_driver, port);
 657         }
 658
 659         return 0;
 660 }
 661
 662 /****************************************************************************/
 663
 664 static struct platform_driver mcf_platform_driver = {
 665         .probe          = mcf_probe,
 666         .remove         = mcf_remove,
 667         .driver         = {
 668                 .name   = "mcfuart",
 669         },
 670 };
 671
 672 /****************************************************************************/
 673
 674 static int __init mcf_init(void)
 675 {
 676         int rc;
 677
 678         printk("ColdFire internal UART serial driver\n");
 679
 680         rc = uart_register_driver(&mcf_driver);
 681         if (rc)
 682                 return rc;
 683         rc = platform_driver_register(&mcf_platform_driver);
 684         if (rc) {
 685                 uart_unregister_driver(&mcf_driver);
 686                 return rc;
 687         }
 688         return 0;
 689 }
 690
 691 /****************************************************************************/
 692
 693 static void __exit mcf_exit(void)
 694 {
 695         platform_driver_unregister(&mcf_platform_driver);
 696         uart_unregister_driver(&mcf_driver);
 697 }
 698
 699 /****************************************************************************/
 700
 701 module_init(mcf_init);
 702 module_exit(mcf_exit);
 703
 704 MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
 705 MODULE_DESCRIPTION("Freescale ColdFire UART driver");
 706 MODULE_LICENSE("GPL");
 707 MODULE_ALIAS("platform:mcfuart");
 708
 709 /****************************************************************************/