drivers/tty/serial/mcf.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /****************************************************************************/
   3
   4 /*
   5  *      mcf.c -- Freescale ColdFire UART driver
   6  *
   7  *      (C) Copyright 2003-2007, Greg Ungerer <gerg@uclinux.org>
   8  */
   9
  10 /****************************************************************************/
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/console.h>
  17 #include <linux/tty.h>
  18 #include <linux/tty_flip.h>
  19 #include <linux/serial.h>
  20 #include <linux/serial_core.h>
  21 #include <linux/io.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/platform_device.h>
  24 #include <asm/coldfire.h>
  25 #include <asm/mcfsim.h>
  26 #include <asm/mcfuart.h>
  27 #include <asm/nettel.h>
  28
  29 /****************************************************************************/
  30
  31 /*
  32  *      Some boards implement the DTR/DCD lines using GPIO lines, most
  33  *      don't. Dummy out the access macros for those that don't. Those
  34  *      that do should define these macros somewhere in there board
  35  *      specific inlude files.
  36  */
  37 #if !defined(mcf_getppdcd)
  38 #define mcf_getppdcd(p)         (1)
  39 #endif
  40 #if !defined(mcf_getppdtr)
  41 #define mcf_getppdtr(p)         (1)
  42 #endif
  43 #if !defined(mcf_setppdtr)
  44 #define mcf_setppdtr(p, v)      do { } while (0)
  45 #endif
  46
  47 /****************************************************************************/
  48
  49 /*
  50  *      Local per-uart structure.
  51  */
  52 struct mcf_uart {
  53         struct uart_port        port;
  54         unsigned int            sigs;           /* Local copy of line sigs */
  55         unsigned char           imr;            /* Local IMR mirror */
  56 };
  57
  58 /****************************************************************************/
  59
  60 static unsigned int mcf_tx_empty(struct uart_port *port)
  61 {
  62         return (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXEMPTY) ?
  63                 TIOCSER_TEMT : 0;
  64 }
  65
  66 /****************************************************************************/
  67
  68 static unsigned int mcf_get_mctrl(struct uart_port *port)
  69 {
  70         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
  71         unsigned int sigs;
  72
  73         sigs = (readb(port->membase + MCFUART_UIPR) & MCFUART_UIPR_CTS) ?
  74                 0 : TIOCM_CTS;
  75         sigs |= (pp->sigs & TIOCM_RTS);
  76         sigs |= (mcf_getppdcd(port->line) ? TIOCM_CD : 0);
  77         sigs |= (mcf_getppdtr(port->line) ? TIOCM_DTR : 0);
  78
  79         return sigs;
  80 }
  81
  82 /****************************************************************************/
  83
  84 static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs)
  85 {
  86         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
  87
  88         pp->sigs = sigs;
  89         mcf_setppdtr(port->line, (sigs & TIOCM_DTR));
  90         if (sigs & TIOCM_RTS)
  91                 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
  92         else
  93                 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP0);
  94 }
  95
  96 /****************************************************************************/
  97
  98 static void mcf_start_tx(struct uart_port *port)
  99 {
 100         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 101
 102         if (port->rs485.flags & SER_RS485_ENABLED) {
 103                 /* Enable Transmitter */
 104                 writeb(MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR);
 105                 /* Manually assert RTS */
 106                 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
 107         }
 108         pp->imr |= MCFUART_UIR_TXREADY;
 109         writeb(pp->imr, port->membase + MCFUART_UIMR);
 110 }
 111
 112 /****************************************************************************/
 113
 114 static void mcf_stop_tx(struct uart_port *port)
 115 {
 116         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 117
 118         pp->imr &= ~MCFUART_UIR_TXREADY;
 119         writeb(pp->imr, port->membase + MCFUART_UIMR);
 120 }
 121
 122 /****************************************************************************/
 123
 124 static void mcf_stop_rx(struct uart_port *port)
 125 {
 126         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 127
 128         pp->imr &= ~MCFUART_UIR_RXREADY;
 129         writeb(pp->imr, port->membase + MCFUART_UIMR);
 130 }
 131
 132 /****************************************************************************/
 133
 134 static void mcf_break_ctl(struct uart_port *port, int break_state)
 135 {
 136         unsigned long flags;
 137
 138         uart_port_lock_irqsave(port, &flags);
 139         if (break_state == -1)
 140                 writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR);
 141         else
 142                 writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR);
 143         uart_port_unlock_irqrestore(port, flags);
 144 }
 145
 146 /****************************************************************************/
 147
 148 static int mcf_startup(struct uart_port *port)
 149 {
 150         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 151         unsigned long flags;
 152
 153         uart_port_lock_irqsave(port, &flags);
 154
 155         /* Reset UART, get it into known state... */
 156         writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
 157         writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
 158
 159         /* Enable the UART transmitter and receiver */
 160         writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
 161                 port->membase + MCFUART_UCR);
 162
 163         /* Enable RX interrupts now */
 164         pp->imr = MCFUART_UIR_RXREADY;
 165         writeb(pp->imr, port->membase + MCFUART_UIMR);
 166
 167         uart_port_unlock_irqrestore(port, flags);
 168
 169         return 0;
 170 }
 171
 172 /****************************************************************************/
 173
 174 static void mcf_shutdown(struct uart_port *port)
 175 {
 176         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 177         unsigned long flags;
 178
 179         uart_port_lock_irqsave(port, &flags);
 180
 181         /* Disable all interrupts now */
 182         pp->imr = 0;
 183         writeb(pp->imr, port->membase + MCFUART_UIMR);
 184
 185         /* Disable UART transmitter and receiver */
 186         writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
 187         writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
 188
 189         uart_port_unlock_irqrestore(port, flags);
 190 }
 191
 192 /****************************************************************************/
 193
 194 static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
 195                             const struct ktermios *old)
 196 {
 197         unsigned long flags;
 198         unsigned int baud, baudclk;
 199 #if defined(CONFIG_M5272)
 200         unsigned int baudfr;
 201 #endif
 202         unsigned char mr1, mr2;
 203
 204         baud = uart_get_baud_rate(port, termios, old, 0, 230400);
 205 #if defined(CONFIG_M5272)
 206         baudclk = (MCF_BUSCLK / baud) / 32;
 207         baudfr = (((MCF_BUSCLK / baud) + 1) / 2) % 16;
 208 #else
 209         baudclk = ((MCF_BUSCLK / baud) + 16) / 32;
 210 #endif
 211
 212         mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
 213         mr2 = 0;
 214
 215         switch (termios->c_cflag & CSIZE) {
 216         case CS5: mr1 |= MCFUART_MR1_CS5; break;
 217         case CS6: mr1 |= MCFUART_MR1_CS6; break;
 218         case CS7: mr1 |= MCFUART_MR1_CS7; break;
 219         case CS8:
 220         default:  mr1 |= MCFUART_MR1_CS8; break;
 221         }
 222
 223         if (termios->c_cflag & PARENB) {
 224                 if (termios->c_cflag & CMSPAR) {
 225                         if (termios->c_cflag & PARODD)
 226                                 mr1 |= MCFUART_MR1_PARITYMARK;
 227                         else
 228                                 mr1 |= MCFUART_MR1_PARITYSPACE;
 229                 } else {
 230                         if (termios->c_cflag & PARODD)
 231                                 mr1 |= MCFUART_MR1_PARITYODD;
 232                         else
 233                                 mr1 |= MCFUART_MR1_PARITYEVEN;
 234                 }
 235         } else {
 236                 mr1 |= MCFUART_MR1_PARITYNONE;
 237         }
 238
 239         /*
 240          * FIXME: port->read_status_mask and port->ignore_status_mask
 241          * need to be initialized based on termios settings for
 242          * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
 243          */
 244
 245         if (termios->c_cflag & CSTOPB)
 246                 mr2 |= MCFUART_MR2_STOP2;
 247         else
 248                 mr2 |= MCFUART_MR2_STOP1;
 249
 250         if (termios->c_cflag & CRTSCTS) {
 251                 mr1 |= MCFUART_MR1_RXRTS;
 252                 mr2 |= MCFUART_MR2_TXCTS;
 253         }
 254
 255         uart_port_lock_irqsave(port, &flags);
 256         if (port->rs485.flags & SER_RS485_ENABLED) {
 257                 dev_dbg(port->dev, "Setting UART to RS485\n");
 258                 mr2 |= MCFUART_MR2_TXRTS;
 259         }
 260
 261         uart_update_timeout(port, termios->c_cflag, baud);
 262         writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
 263         writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
 264         writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR);
 265         writeb(mr1, port->membase + MCFUART_UMR);
 266         writeb(mr2, port->membase + MCFUART_UMR);
 267         writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1);
 268         writeb((baudclk & 0xff), port->membase + MCFUART_UBG2);
 269 #if defined(CONFIG_M5272)
 270         writeb((baudfr & 0x0f), port->membase + MCFUART_UFPD);
 271 #endif
 272         writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER,
 273                 port->membase + MCFUART_UCSR);
 274         writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
 275                 port->membase + MCFUART_UCR);
 276         uart_port_unlock_irqrestore(port, flags);
 277 }
 278
 279 /****************************************************************************/
 280
 281 static void mcf_rx_chars(struct mcf_uart *pp)
 282 {
 283         struct uart_port *port = &pp->port;
 284         u8 status, ch, flag;
 285
 286         while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) {
 287                 ch = readb(port->membase + MCFUART_URB);
 288                 flag = TTY_NORMAL;
 289                 port->icount.rx++;
 290
 291                 if (status & MCFUART_USR_RXERR) {
 292                         writeb(MCFUART_UCR_CMDRESETERR,
 293                                 port->membase + MCFUART_UCR);
 294
 295                         if (status & MCFUART_USR_RXBREAK) {
 296                                 port->icount.brk++;
 297                                 if (uart_handle_break(port))
 298                                         continue;
 299                         } else if (status & MCFUART_USR_RXPARITY) {
 300                                 port->icount.parity++;
 301                         } else if (status & MCFUART_USR_RXOVERRUN) {
 302                                 port->icount.overrun++;
 303                         } else if (status & MCFUART_USR_RXFRAMING) {
 304                                 port->icount.frame++;
 305                         }
 306
 307                         status &= port->read_status_mask;
 308
 309                         if (status & MCFUART_USR_RXBREAK)
 310                                 flag = TTY_BREAK;
 311                         else if (status & MCFUART_USR_RXPARITY)
 312                                 flag = TTY_PARITY;
 313                         else if (status & MCFUART_USR_RXFRAMING)
 314                                 flag = TTY_FRAME;
 315                 }
 316
 317                 if (uart_handle_sysrq_char(port, ch))
 318                         continue;
 319                 uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
 320         }
 321
 322         tty_flip_buffer_push(&port->state->port);
 323 }
 324
 325 /****************************************************************************/
 326
 327 static void mcf_tx_chars(struct mcf_uart *pp)
 328 {
 329         struct uart_port *port = &pp->port;
 330         bool pending;
 331         u8 ch;
 332
 333         pending = uart_port_tx(port, ch,
 334                 readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY,
 335                 writeb(ch, port->membase + MCFUART_UTB));
 336
 337         /* Disable TX to negate RTS automatically */
 338         if (!pending && (port->rs485.flags & SER_RS485_ENABLED))
 339                 writeb(MCFUART_UCR_TXDISABLE, port->membase + MCFUART_UCR);
 340 }
 341
 342 /****************************************************************************/
 343
 344 static irqreturn_t mcf_interrupt(int irq, void *data)
 345 {
 346         struct uart_port *port = data;
 347         struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
 348         unsigned int isr;
 349         irqreturn_t ret = IRQ_NONE;
 350
 351         isr = readb(port->membase + MCFUART_UISR) & pp->imr;
 352
 353         uart_port_lock(port);
 354         if (isr & MCFUART_UIR_RXREADY) {
 355                 mcf_rx_chars(pp);
 356                 ret = IRQ_HANDLED;
 357         }
 358         if (isr & MCFUART_UIR_TXREADY) {
 359                 mcf_tx_chars(pp);
 360                 ret = IRQ_HANDLED;
 361         }
 362         uart_port_unlock(port);
 363
 364         return ret;
 365 }
 366
 367 /****************************************************************************/
 368
 369 static void mcf_config_port(struct uart_port *port, int flags)
 370 {
 371         port->type = PORT_MCF;
 372         port->fifosize = MCFUART_TXFIFOSIZE;
 373
 374         /* Clear mask, so no surprise interrupts. */
 375         writeb(0, port->membase + MCFUART_UIMR);
 376
 377         if (request_irq(port->irq, mcf_interrupt, 0, "UART", port))
 378                 printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
 379                         "interrupt vector=%d\n", port->line, port->irq);
 380 }
 381
 382 /****************************************************************************/
 383
 384 static const char *mcf_type(struct uart_port *port)
 385 {
 386         return (port->type == PORT_MCF) ? "ColdFire UART" : NULL;
 387 }
 388
 389 /****************************************************************************/
 390
 391 static int mcf_request_port(struct uart_port *port)
 392 {
 393         /* UARTs always present */
 394         return 0;
 395 }
 396
 397 /****************************************************************************/
 398
 399 static void mcf_release_port(struct uart_port *port)
 400 {
 401         /* Nothing to release... */
 402 }
 403
 404 /****************************************************************************/
 405
 406 static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
 407 {
 408         if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF))
 409                 return -EINVAL;
 410         return 0;
 411 }
 412
 413 /****************************************************************************/
 414
 415 /* Enable or disable the RS485 support */
 416 static int mcf_config_rs485(struct uart_port *port, struct ktermios *termios,
 417                             struct serial_rs485 *rs485)
 418 {
 419         unsigned char mr1, mr2;
 420
 421         /* Get mode registers */
 422         mr1 = readb(port->membase + MCFUART_UMR);
 423         mr2 = readb(port->membase + MCFUART_UMR);
 424         if (rs485->flags & SER_RS485_ENABLED) {
 425                 dev_dbg(port->dev, "Setting UART to RS485\n");
 426                 /* Automatically negate RTS after TX completes */
 427                 mr2 |= MCFUART_MR2_TXRTS;
 428         } else {
 429                 dev_dbg(port->dev, "Setting UART to RS232\n");
 430                 mr2 &= ~MCFUART_MR2_TXRTS;
 431         }
 432         writeb(mr1, port->membase + MCFUART_UMR);
 433         writeb(mr2, port->membase + MCFUART_UMR);
 434
 435         return 0;
 436 }
 437
 438 static const struct serial_rs485 mcf_rs485_supported = {
 439         .flags = SER_RS485_ENABLED | SER_RS485_RTS_AFTER_SEND,
 440 };
 441
 442 /****************************************************************************/
 443
 444 /*
 445  *      Define the basic serial functions we support.
 446  */
 447 static const struct uart_ops mcf_uart_ops = {
 448         .tx_empty       = mcf_tx_empty,
 449         .get_mctrl      = mcf_get_mctrl,
 450         .set_mctrl      = mcf_set_mctrl,
 451         .start_tx       = mcf_start_tx,
 452         .stop_tx        = mcf_stop_tx,
 453         .stop_rx        = mcf_stop_rx,
 454         .break_ctl      = mcf_break_ctl,
 455         .startup        = mcf_startup,
 456         .shutdown       = mcf_shutdown,
 457         .set_termios    = mcf_set_termios,
 458         .type           = mcf_type,
 459         .request_port   = mcf_request_port,
 460         .release_port   = mcf_release_port,
 461         .config_port    = mcf_config_port,
 462         .verify_port    = mcf_verify_port,
 463 };
 464
 465 static struct mcf_uart mcf_ports[10];
 466
 467 #define MCF_MAXPORTS    ARRAY_SIZE(mcf_ports)
 468
 469 /****************************************************************************/
 470 #if defined(CONFIG_SERIAL_MCF_CONSOLE)
 471 /****************************************************************************/
 472
 473 static void mcf_console_putc(struct console *co, const char c)
 474 {
 475         struct uart_port *port = &(mcf_ports + co->index)->port;
 476         int i;
 477
 478         for (i = 0; (i < 0x10000); i++) {
 479                 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
 480                         break;
 481         }
 482         writeb(c, port->membase + MCFUART_UTB);
 483         for (i = 0; (i < 0x10000); i++) {
 484                 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
 485                         break;
 486         }
 487 }
 488
 489 /****************************************************************************/
 490
 491 static void mcf_console_write(struct console *co, const char *s, unsigned int count)
 492 {
 493         for (; (count); count--, s++) {
 494                 mcf_console_putc(co, *s);
 495                 if (*s == '\n')
 496                         mcf_console_putc(co, '\r');
 497         }
 498 }
 499
 500 /****************************************************************************/
 501
 502 static int __init mcf_console_setup(struct console *co, char *options)
 503 {
 504         struct uart_port *port;
 505         int baud = CONFIG_SERIAL_MCF_BAUDRATE;
 506         int bits = 8;
 507         int parity = 'n';
 508         int flow = 'n';
 509
 510         if ((co->index < 0) || (co->index >= MCF_MAXPORTS))
 511                 co->index = 0;
 512         port = &mcf_ports[co->index].port;
 513         if (port->membase == 0)
 514                 return -ENODEV;
 515
 516         if (options)
 517                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 518
 519         return uart_set_options(port, co, baud, parity, bits, flow);
 520 }
 521
 522 /****************************************************************************/
 523
 524 static struct uart_driver mcf_driver;
 525
 526 static struct console mcf_console = {
 527         .name           = "ttyS",
 528         .write          = mcf_console_write,
 529         .device         = uart_console_device,
 530         .setup          = mcf_console_setup,
 531         .flags          = CON_PRINTBUFFER,
 532         .index          = -1,
 533         .data           = &mcf_driver,
 534 };
 535
 536 static int __init mcf_console_init(void)
 537 {
 538         register_console(&mcf_console);
 539         return 0;
 540 }
 541
 542 console_initcall(mcf_console_init);
 543
 544 #define MCF_CONSOLE     &mcf_console
 545
 546 /****************************************************************************/
 547 #else
 548 /****************************************************************************/
 549
 550 #define MCF_CONSOLE     NULL
 551
 552 /****************************************************************************/
 553 #endif /* CONFIG_SERIAL_MCF_CONSOLE */
 554 /****************************************************************************/
 555
 556 /*
 557  *      Define the mcf UART driver structure.
 558  */
 559 static struct uart_driver mcf_driver = {
 560         .owner          = THIS_MODULE,
 561         .driver_name    = "mcf",
 562         .dev_name       = "ttyS",
 563         .major          = TTY_MAJOR,
 564         .minor          = 64,
 565         .nr             = MCF_MAXPORTS,
 566         .cons           = MCF_CONSOLE,
 567 };
 568
 569 /****************************************************************************/
 570
 571 static int mcf_probe(struct platform_device *pdev)
 572 {
 573         struct mcf_platform_uart *platp = dev_get_platdata(&pdev->dev);
 574         struct uart_port *port;
 575         int i;
 576
 577         for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
 578                 port = &mcf_ports[i].port;
 579
 580                 port->line = i;
 581                 port->type = PORT_MCF;
 582                 port->mapbase = platp[i].mapbase;
 583                 port->membase = (platp[i].membase) ? platp[i].membase :
 584                         (unsigned char __iomem *) platp[i].mapbase;
 585                 port->dev = &pdev->dev;
 586                 port->iotype = SERIAL_IO_MEM;
 587                 port->irq = platp[i].irq;
 588                 port->uartclk = MCF_BUSCLK;
 589                 port->ops = &mcf_uart_ops;
 590                 port->flags = UPF_BOOT_AUTOCONF;
 591                 port->rs485_config = mcf_config_rs485;
 592                 port->rs485_supported = mcf_rs485_supported;
 593                 port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_MCF_CONSOLE);
 594
 595                 uart_add_one_port(&mcf_driver, port);
 596         }
 597
 598         return 0;
 599 }
 600
 601 /****************************************************************************/
 602
 603 static void mcf_remove(struct platform_device *pdev)
 604 {
 605         struct uart_port *port;
 606         int i;
 607
 608         for (i = 0; (i < MCF_MAXPORTS); i++) {
 609                 port = &mcf_ports[i].port;
 610                 if (port)
 611                         uart_remove_one_port(&mcf_driver, port);
 612         }
 613 }
 614
 615 /****************************************************************************/
 616
 617 static struct platform_driver mcf_platform_driver = {
 618         .probe          = mcf_probe,
 619         .remove         = mcf_remove,
 620         .driver         = {
 621                 .name   = "mcfuart",
 622         },
 623 };
 624
 625 /****************************************************************************/
 626
 627 static int __init mcf_init(void)
 628 {
 629         int rc;
 630
 631         printk("ColdFire internal UART serial driver\n");
 632
 633         rc = uart_register_driver(&mcf_driver);
 634         if (rc)
 635                 return rc;
 636         rc = platform_driver_register(&mcf_platform_driver);
 637         if (rc) {
 638                 uart_unregister_driver(&mcf_driver);
 639                 return rc;
 640         }
 641         return 0;
 642 }
 643
 644 /****************************************************************************/
 645
 646 static void __exit mcf_exit(void)
 647 {
 648         platform_driver_unregister(&mcf_platform_driver);
 649         uart_unregister_driver(&mcf_driver);
 650 }
 651
 652 /****************************************************************************/
 653
 654 module_init(mcf_init);
 655 module_exit(mcf_exit);
 656
 657 MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
 658 MODULE_DESCRIPTION("Freescale ColdFire UART driver");
 659 MODULE_LICENSE("GPL");
 660 MODULE_ALIAS("platform:mcfuart");
 661
 662 /****************************************************************************/