LXR linux/drivers/tty/serial/altera

   1/*
   2 * altera_uart.c -- Altera UART driver
   3 *
   4 * Based on mcf.c -- Freescale ColdFire UART driver
   5 *
   6 * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
   7 * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw>
   8 * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch>
   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
  16#include <linux/kernel.h>
  17#include <linux/init.h>
  18#include <linux/timer.h>
  19#include <linux/interrupt.h>
  20#include <linux/module.h>
  21#include <linux/console.h>
  22#include <linux/tty.h>
  23#include <linux/tty_flip.h>
  24#include <linux/serial.h>
  25#include <linux/serial_core.h>
  26#include <linux/platform_device.h>
  27#include <linux/of.h>
  28#include <linux/io.h>
  29#include <linux/altera_uart.h>
  30
  31#define DRV_NAME "altera_uart"
  32#define SERIAL_ALTERA_MAJOR 204
  33#define SERIAL_ALTERA_MINOR 213
  34
  35/*
  36 * Altera UART register definitions according to the Nios UART datasheet:
  37 * http://www.altera.com/literature/ds/ds_nios_uart.pdf
  38 */
  39
  40#define ALTERA_UART_SIZE                32
  41
  42#define ALTERA_UART_RXDATA_REG          0
  43#define ALTERA_UART_TXDATA_REG          4
  44#define ALTERA_UART_STATUS_REG          8
  45#define ALTERA_UART_CONTROL_REG         12
  46#define ALTERA_UART_DIVISOR_REG         16
  47#define ALTERA_UART_EOP_REG             20
  48
  49#define ALTERA_UART_STATUS_PE_MSK       0x0001  /* parity error */
  50#define ALTERA_UART_STATUS_FE_MSK       0x0002  /* framing error */
  51#define ALTERA_UART_STATUS_BRK_MSK      0x0004  /* break */
  52#define ALTERA_UART_STATUS_ROE_MSK      0x0008  /* RX overrun error */
  53#define ALTERA_UART_STATUS_TOE_MSK      0x0010  /* TX overrun error */
  54#define ALTERA_UART_STATUS_TMT_MSK      0x0020  /* TX shift register state */
  55#define ALTERA_UART_STATUS_TRDY_MSK     0x0040  /* TX ready */
  56#define ALTERA_UART_STATUS_RRDY_MSK     0x0080  /* RX ready */
  57#define ALTERA_UART_STATUS_E_MSK        0x0100  /* exception condition */
  58#define ALTERA_UART_STATUS_DCTS_MSK     0x0400  /* CTS logic-level change */
  59#define ALTERA_UART_STATUS_CTS_MSK      0x0800  /* CTS logic state */
  60#define ALTERA_UART_STATUS_EOP_MSK      0x1000  /* EOP written/read */
  61
  62                                                /* Enable interrupt on... */
  63#define ALTERA_UART_CONTROL_PE_MSK      0x0001  /* ...parity error */
  64#define ALTERA_UART_CONTROL_FE_MSK      0x0002  /* ...framing error */
  65#define ALTERA_UART_CONTROL_BRK_MSK     0x0004  /* ...break */
  66#define ALTERA_UART_CONTROL_ROE_MSK     0x0008  /* ...RX overrun */
  67#define ALTERA_UART_CONTROL_TOE_MSK     0x0010  /* ...TX overrun */
  68#define ALTERA_UART_CONTROL_TMT_MSK     0x0020  /* ...TX shift register empty */
  69#define ALTERA_UART_CONTROL_TRDY_MSK    0x0040  /* ...TX ready */
  70#define ALTERA_UART_CONTROL_RRDY_MSK    0x0080  /* ...RX ready */
  71#define ALTERA_UART_CONTROL_E_MSK       0x0100  /* ...exception*/
  72
  73#define ALTERA_UART_CONTROL_TRBK_MSK    0x0200  /* TX break */
  74#define ALTERA_UART_CONTROL_DCTS_MSK    0x0400  /* Interrupt on CTS change */
  75#define ALTERA_UART_CONTROL_RTS_MSK     0x0800  /* RTS signal */
  76#define ALTERA_UART_CONTROL_EOP_MSK     0x1000  /* Interrupt on EOP */
  77
  78/*
  79 * Local per-uart structure.
  80 */
  81struct altera_uart {
  82        struct uart_port port;
  83        struct timer_list tmr;
  84        unsigned int sigs;      /* Local copy of line sigs */
  85        unsigned short imr;     /* Local IMR mirror */
  86};
  87
  88static u32 altera_uart_readl(struct uart_port *port, int reg)
  89{
  90        return readl(port->membase + (reg << port->regshift));
  91}
  92
  93static void altera_uart_writel(struct uart_port *port, u32 dat, int reg)
  94{
  95        writel(dat, port->membase + (reg << port->regshift));
  96}
  97
  98static unsigned int altera_uart_tx_empty(struct uart_port *port)
  99{
 100        return (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 101                ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0;
 102}
 103
 104static unsigned int altera_uart_get_mctrl(struct uart_port *port)
 105{
 106        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 107        unsigned int sigs;
 108
 109        sigs = (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 110             ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0;
 111        sigs |= (pp->sigs & TIOCM_RTS);
 112
 113        return sigs;
 114}
 115
 116static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs)
 117{
 118        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 119
 120        pp->sigs = sigs;
 121        if (sigs & TIOCM_RTS)
 122                pp->imr |= ALTERA_UART_CONTROL_RTS_MSK;
 123        else
 124                pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK;
 125        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
 126}
 127
 128static void altera_uart_start_tx(struct uart_port *port)
 129{
 130        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 131
 132        pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK;
 133        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
 134}
 135
 136static void altera_uart_stop_tx(struct uart_port *port)
 137{
 138        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 139
 140        pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
 141        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
 142}
 143
 144static void altera_uart_stop_rx(struct uart_port *port)
 145{
 146        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 147
 148        pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK;
 149        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
 150}
 151
 152static void altera_uart_break_ctl(struct uart_port *port, int break_state)
 153{
 154        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 155        unsigned long flags;
 156
 157        spin_lock_irqsave(&port->lock, flags);
 158        if (break_state == -1)
 159                pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK;
 160        else
 161                pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK;
 162        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
 163        spin_unlock_irqrestore(&port->lock, flags);
 164}
 165
 166static void altera_uart_enable_ms(struct uart_port *port)
 167{
 168}
 169
 170static void altera_uart_set_termios(struct uart_port *port,
 171                                    struct ktermios *termios,
 172                                    struct ktermios *old)
 173{
 174        unsigned long flags;
 175        unsigned int baud, baudclk;
 176
 177        baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
 178        baudclk = port->uartclk / baud;
 179
 180        if (old)
 181                tty_termios_copy_hw(termios, old);
 182        tty_termios_encode_baud_rate(termios, baud, baud);
 183
 184        spin_lock_irqsave(&port->lock, flags);
 185        uart_update_timeout(port, termios->c_cflag, baud);
 186        altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
 187        spin_unlock_irqrestore(&port->lock, flags);
 188}
 189
 190static void altera_uart_rx_chars(struct altera_uart *pp)
 191{
 192        struct uart_port *port = &pp->port;
 193        unsigned char ch, flag;
 194        unsigned short status;
 195
 196        while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) &
 197               ALTERA_UART_STATUS_RRDY_MSK) {
 198                ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
 199                flag = TTY_NORMAL;
 200                port->icount.rx++;
 201
 202                if (status & ALTERA_UART_STATUS_E_MSK) {
 203                        altera_uart_writel(port, status,
 204                                           ALTERA_UART_STATUS_REG);
 205
 206                        if (status & ALTERA_UART_STATUS_BRK_MSK) {
 207                                port->icount.brk++;
 208                                if (uart_handle_break(port))
 209                                        continue;
 210                        } else if (status & ALTERA_UART_STATUS_PE_MSK) {
 211                                port->icount.parity++;
 212                        } else if (status & ALTERA_UART_STATUS_ROE_MSK) {
 213                                port->icount.overrun++;
 214                        } else if (status & ALTERA_UART_STATUS_FE_MSK) {
 215                                port->icount.frame++;
 216                        }
 217
 218                        status &= port->read_status_mask;
 219
 220                        if (status & ALTERA_UART_STATUS_BRK_MSK)
 221                                flag = TTY_BREAK;
 222                        else if (status & ALTERA_UART_STATUS_PE_MSK)
 223                                flag = TTY_PARITY;
 224                        else if (status & ALTERA_UART_STATUS_FE_MSK)
 225                                flag = TTY_FRAME;
 226                }
 227
 228                if (uart_handle_sysrq_char(port, ch))
 229                        continue;
 230                uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch,
 231                                 flag);
 232        }
 233
 234        tty_flip_buffer_push(port->state->port.tty);
 235}
 236
 237static void altera_uart_tx_chars(struct altera_uart *pp)
 238{
 239        struct uart_port *port = &pp->port;
 240        struct circ_buf *xmit = &port->state->xmit;
 241
 242        if (port->x_char) {
 243                /* Send special char - probably flow control */
 244                altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG);
 245                port->x_char = 0;
 246                port->icount.tx++;
 247                return;
 248        }
 249
 250        while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 251               ALTERA_UART_STATUS_TRDY_MSK) {
 252                if (xmit->head == xmit->tail)
 253                        break;
 254                altera_uart_writel(port, xmit->buf[xmit->tail],
 255                       ALTERA_UART_TXDATA_REG);
 256                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 257                port->icount.tx++;
 258        }
 259
 260        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 261                uart_write_wakeup(port);
 262
 263        if (xmit->head == xmit->tail) {
 264                pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
 265                altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
 266        }
 267}
 268
 269static irqreturn_t altera_uart_interrupt(int irq, void *data)
 270{
 271        struct uart_port *port = data;
 272        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 273        unsigned int isr;
 274
 275        isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr;
 276
 277        spin_lock(&port->lock);
 278        if (isr & ALTERA_UART_STATUS_RRDY_MSK)
 279                altera_uart_rx_chars(pp);
 280        if (isr & ALTERA_UART_STATUS_TRDY_MSK)
 281                altera_uart_tx_chars(pp);
 282        spin_unlock(&port->lock);
 283
 284        return IRQ_RETVAL(isr);
 285}
 286
 287static void altera_uart_timer(unsigned long data)
 288{
 289        struct uart_port *port = (void *)data;
 290        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 291
 292        altera_uart_interrupt(0, port);
 293        mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
 294}
 295
 296static void altera_uart_config_port(struct uart_port *port, int flags)
 297{
 298        port->type = PORT_ALTERA_UART;
 299
 300        /* Clear mask, so no surprise interrupts. */
 301        altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG);
 302        /* Clear status register */
 303        altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG);
 304}
 305
 306static int altera_uart_startup(struct uart_port *port)
 307{
 308        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 309        unsigned long flags;
 310        int ret;
 311
 312        if (!port->irq) {
 313                setup_timer(&pp->tmr, altera_uart_timer, (unsigned long)port);
 314                mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
 315                return 0;
 316        }
 317
 318        ret = request_irq(port->irq, altera_uart_interrupt, 0,
 319                        DRV_NAME, port);
 320        if (ret) {
 321                pr_err(DRV_NAME ": unable to attach Altera UART %d "
 322                       "interrupt vector=%d\n", port->line, port->irq);
 323                return ret;
 324        }
 325
 326        spin_lock_irqsave(&port->lock, flags);
 327
 328        /* Enable RX interrupts now */
 329        pp->imr = ALTERA_UART_CONTROL_RRDY_MSK;
 330        writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
 331
 332        spin_unlock_irqrestore(&port->lock, flags);
 333
 334        return 0;
 335}
 336
 337static void altera_uart_shutdown(struct uart_port *port)
 338{
 339        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 340        unsigned long flags;
 341
 342        spin_lock_irqsave(&port->lock, flags);
 343
 344        /* Disable all interrupts now */
 345        pp->imr = 0;
 346        writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
 347
 348        spin_unlock_irqrestore(&port->lock, flags);
 349
 350        if (port->irq)
 351                free_irq(port->irq, port);
 352        else
 353                del_timer_sync(&pp->tmr);
 354}
 355
 356static const char *altera_uart_type(struct uart_port *port)
 357{
 358        return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL;
 359}
 360
 361static int altera_uart_request_port(struct uart_port *port)
 362{
 363        /* UARTs always present */
 364        return 0;
 365}
 366
 367static void altera_uart_release_port(struct uart_port *port)
 368{
 369        /* Nothing to release... */
 370}
 371
 372static int altera_uart_verify_port(struct uart_port *port,
 373                                   struct serial_struct *ser)
 374{
 375        if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART))
 376                return -EINVAL;
 377        return 0;
 378}
 379
 380#ifdef CONFIG_CONSOLE_POLL
 381static int altera_uart_poll_get_char(struct uart_port *port)
 382{
 383        while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 384                 ALTERA_UART_STATUS_RRDY_MSK))
 385                cpu_relax();
 386
 387        return altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
 388}
 389
 390static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c)
 391{
 392        while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 393                 ALTERA_UART_STATUS_TRDY_MSK))
 394                cpu_relax();
 395
 396        altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
 397}
 398#endif
 399
 400/*
 401 *      Define the basic serial functions we support.
 402 */
 403static struct uart_ops altera_uart_ops = {
 404        .tx_empty       = altera_uart_tx_empty,
 405        .get_mctrl      = altera_uart_get_mctrl,
 406        .set_mctrl      = altera_uart_set_mctrl,
 407        .start_tx       = altera_uart_start_tx,
 408        .stop_tx        = altera_uart_stop_tx,
 409        .stop_rx        = altera_uart_stop_rx,
 410        .enable_ms      = altera_uart_enable_ms,
 411        .break_ctl      = altera_uart_break_ctl,
 412        .startup        = altera_uart_startup,
 413        .shutdown       = altera_uart_shutdown,
 414        .set_termios    = altera_uart_set_termios,
 415        .type           = altera_uart_type,
 416        .request_port   = altera_uart_request_port,
 417        .release_port   = altera_uart_release_port,
 418        .config_port    = altera_uart_config_port,
 419        .verify_port    = altera_uart_verify_port,
 420#ifdef CONFIG_CONSOLE_POLL
 421        .poll_get_char  = altera_uart_poll_get_char,
 422        .poll_put_char  = altera_uart_poll_put_char,
 423#endif
 424};
 425
 426static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
 427
 428#if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
 429
 430static void altera_uart_console_putc(struct uart_port *port, const char c)
 431{
 432        while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 433                 ALTERA_UART_STATUS_TRDY_MSK))
 434                cpu_relax();
 435
 436        writel(c, port->membase + ALTERA_UART_TXDATA_REG);
 437}
 438
 439static void altera_uart_console_write(struct console *co, const char *s,
 440                                      unsigned int count)
 441{
 442        struct uart_port *port = &(altera_uart_ports + co->index)->port;
 443
 444        for (; count; count--, s++) {
 445                altera_uart_console_putc(port, *s);
 446                if (*s == '\n')
 447                        altera_uart_console_putc(port, '\r');
 448        }
 449}
 450
 451static int __init altera_uart_console_setup(struct console *co, char *options)
 452{
 453        struct uart_port *port;
 454        int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
 455        int bits = 8;
 456        int parity = 'n';
 457        int flow = 'n';
 458
 459        if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
 460                return -EINVAL;
 461        port = &altera_uart_ports[co->index].port;
 462        if (!port->membase)
 463                return -ENODEV;
 464
 465        if (options)
 466                uart_parse_options(options, &baud, &parity, &bits, &flow);
 467
 468        return uart_set_options(port, co, baud, parity, bits, flow);
 469}
 470
 471static struct uart_driver altera_uart_driver;
 472
 473static struct console altera_uart_console = {
 474        .name   = "ttyAL",
 475        .write  = altera_uart_console_write,
 476        .device = uart_console_device,
 477        .setup  = altera_uart_console_setup,
 478        .flags  = CON_PRINTBUFFER,
 479        .index  = -1,
 480        .data   = &altera_uart_driver,
 481};
 482
 483static int __init altera_uart_console_init(void)
 484{
 485        register_console(&altera_uart_console);
 486        return 0;
 487}
 488
 489console_initcall(altera_uart_console_init);
 490
 491#define ALTERA_UART_CONSOLE     (&altera_uart_console)
 492
 493#else
 494
 495#define ALTERA_UART_CONSOLE     NULL
 496
 497#endif /* CONFIG_ALTERA_UART_CONSOLE */
 498
 499/*
 500 *      Define the altera_uart UART driver structure.
 501 */
 502static struct uart_driver altera_uart_driver = {
 503        .owner          = THIS_MODULE,
 504        .driver_name    = DRV_NAME,
 505        .dev_name       = "ttyAL",
 506        .major          = SERIAL_ALTERA_MAJOR,
 507        .minor          = SERIAL_ALTERA_MINOR,
 508        .nr             = CONFIG_SERIAL_ALTERA_UART_MAXPORTS,
 509        .cons           = ALTERA_UART_CONSOLE,
 510};
 511
 512#ifdef CONFIG_OF
 513static int altera_uart_get_of_uartclk(struct platform_device *pdev,
 514                                      struct uart_port *port)
 515{
 516        int len;
 517        const __be32 *clk;
 518
 519        clk = of_get_property(pdev->dev.of_node, "clock-frequency", &len);
 520        if (!clk || len < sizeof(__be32))
 521                return -ENODEV;
 522
 523        port->uartclk = be32_to_cpup(clk);
 524
 525        return 0;
 526}
 527#else
 528static int altera_uart_get_of_uartclk(struct platform_device *pdev,
 529                                      struct uart_port *port)
 530{
 531        return -ENODEV;
 532}
 533#endif /* CONFIG_OF */
 534
 535static int __devinit altera_uart_probe(struct platform_device *pdev)
 536{
 537        struct altera_uart_platform_uart *platp = pdev->dev.platform_data;
 538        struct uart_port *port;
 539        struct resource *res_mem;
 540        struct resource *res_irq;
 541        int i = pdev->id;
 542        int ret;
 543
 544        /* if id is -1 scan for a free id and use that one */
 545        if (i == -1) {
 546                for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++)
 547                        if (altera_uart_ports[i].port.mapbase == 0)
 548                                break;
 549        }
 550
 551        if (i < 0 || i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
 552                return -EINVAL;
 553
 554        port = &altera_uart_ports[i].port;
 555
 556        res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 557        if (res_mem)
 558                port->mapbase = res_mem->start;
 559        else if (platp)
 560                port->mapbase = platp->mapbase;
 561        else
 562                return -EINVAL;
 563
 564        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 565        if (res_irq)
 566                port->irq = res_irq->start;
 567        else if (platp)
 568                port->irq = platp->irq;
 569
 570        /* Check platform data first so we can override device node data */
 571        if (platp)
 572                port->uartclk = platp->uartclk;
 573        else {
 574                ret = altera_uart_get_of_uartclk(pdev, port);
 575                if (ret)
 576                        return ret;
 577        }
 578
 579        port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
 580        if (!port->membase)
 581                return -ENOMEM;
 582
 583        if (platp)
 584                port->regshift = platp->bus_shift;
 585        else
 586                port->regshift = 0;
 587
 588        port->line = i;
 589        port->type = PORT_ALTERA_UART;
 590        port->iotype = SERIAL_IO_MEM;
 591        port->ops = &altera_uart_ops;
 592        port->flags = UPF_BOOT_AUTOCONF;
 593
 594        dev_set_drvdata(&pdev->dev, port);
 595
 596        uart_add_one_port(&altera_uart_driver, port);
 597
 598        return 0;
 599}
 600
 601static int __devexit altera_uart_remove(struct platform_device *pdev)
 602{
 603        struct uart_port *port = dev_get_drvdata(&pdev->dev);
 604
 605        if (port) {
 606                uart_remove_one_port(&altera_uart_driver, port);
 607                dev_set_drvdata(&pdev->dev, NULL);
 608                port->mapbase = 0;
 609        }
 610
 611        return 0;
 612}
 613
 614#ifdef CONFIG_OF
 615static struct of_device_id altera_uart_match[] = {
 616        { .compatible = "ALTR,uart-1.0", },
 617        {},
 618};
 619MODULE_DEVICE_TABLE(of, altera_uart_match);
 620#endif /* CONFIG_OF */
 621
 622static struct platform_driver altera_uart_platform_driver = {
 623        .probe  = altera_uart_probe,
 624        .remove = __devexit_p(altera_uart_remove),
 625        .driver = {
 626                .name           = DRV_NAME,
 627                .owner          = THIS_MODULE,
 628                .of_match_table = of_match_ptr(altera_uart_match),
 629        },
 630};
 631
 632static int __init altera_uart_init(void)
 633{
 634        int rc;
 635
 636        rc = uart_register_driver(&altera_uart_driver);
 637        if (rc)
 638                return rc;
 639        rc = platform_driver_register(&altera_uart_platform_driver);
 640        if (rc) {
 641                uart_unregister_driver(&altera_uart_driver);
 642                return rc;
 643        }
 644        return 0;
 645}
 646
 647static void __exit altera_uart_exit(void)
 648{
 649        platform_driver_unregister(&altera_uart_platform_driver);
 650        uart_unregister_driver(&altera_uart_driver);
 651}
 652
 653module_init(altera_uart_init);
 654module_exit(altera_uart_exit);
 655
 656MODULE_DESCRIPTION("Altera UART driver");
 657MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
 658MODULE_LICENSE("GPL");
 659MODULE_ALIAS("platform:" DRV_NAME);
 660MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_ALTERA_MAJOR);
 661