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        spin_unlock(&port->lock);
 235        tty_flip_buffer_push(&port->state->port);
 236        spin_lock(&port->lock);
 237}
 238
 239static void altera_uart_tx_chars(struct altera_uart *pp)
 240{
 241        struct uart_port *port = &pp->port;
 242        struct circ_buf *xmit = &port->state->xmit;
 243
 244        if (port->x_char) {
 245                /* Send special char - probably flow control */
 246                altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG);
 247                port->x_char = 0;
 248                port->icount.tx++;
 249                return;
 250        }
 251
 252        while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 253               ALTERA_UART_STATUS_TRDY_MSK) {
 254                if (xmit->head == xmit->tail)
 255                        break;
 256                altera_uart_writel(port, xmit->buf[xmit->tail],
 257                       ALTERA_UART_TXDATA_REG);
 258                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 259                port->icount.tx++;
 260        }
 261
 262        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 263                uart_write_wakeup(port);
 264
 265        if (xmit->head == xmit->tail) {
 266                pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
 267                altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
 268        }
 269}
 270
 271static irqreturn_t altera_uart_interrupt(int irq, void *data)
 272{
 273        struct uart_port *port = data;
 274        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 275        unsigned int isr;
 276
 277        isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr;
 278
 279        spin_lock(&port->lock);
 280        if (isr & ALTERA_UART_STATUS_RRDY_MSK)
 281                altera_uart_rx_chars(pp);
 282        if (isr & ALTERA_UART_STATUS_TRDY_MSK)
 283                altera_uart_tx_chars(pp);
 284        spin_unlock(&port->lock);
 285
 286        return IRQ_RETVAL(isr);
 287}
 288
 289static void altera_uart_timer(unsigned long data)
 290{
 291        struct uart_port *port = (void *)data;
 292        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 293
 294        altera_uart_interrupt(0, port);
 295        mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
 296}
 297
 298static void altera_uart_config_port(struct uart_port *port, int flags)
 299{
 300        port->type = PORT_ALTERA_UART;
 301
 302        /* Clear mask, so no surprise interrupts. */
 303        altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG);
 304        /* Clear status register */
 305        altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG);
 306}
 307
 308static int altera_uart_startup(struct uart_port *port)
 309{
 310        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 311        unsigned long flags;
 312        int ret;
 313
 314        if (!port->irq) {
 315                setup_timer(&pp->tmr, altera_uart_timer, (unsigned long)port);
 316                mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
 317                return 0;
 318        }
 319
 320        ret = request_irq(port->irq, altera_uart_interrupt, 0,
 321                        DRV_NAME, port);
 322        if (ret) {
 323                pr_err(DRV_NAME ": unable to attach Altera UART %d "
 324                       "interrupt vector=%d\n", port->line, port->irq);
 325                return ret;
 326        }
 327
 328        spin_lock_irqsave(&port->lock, flags);
 329
 330        /* Enable RX interrupts now */
 331        pp->imr = ALTERA_UART_CONTROL_RRDY_MSK;
 332        writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
 333
 334        spin_unlock_irqrestore(&port->lock, flags);
 335
 336        return 0;
 337}
 338
 339static void altera_uart_shutdown(struct uart_port *port)
 340{
 341        struct altera_uart *pp = container_of(port, struct altera_uart, port);
 342        unsigned long flags;
 343
 344        spin_lock_irqsave(&port->lock, flags);
 345
 346        /* Disable all interrupts now */
 347        pp->imr = 0;
 348        writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
 349
 350        spin_unlock_irqrestore(&port->lock, flags);
 351
 352        if (port->irq)
 353                free_irq(port->irq, port);
 354        else
 355                del_timer_sync(&pp->tmr);
 356}
 357
 358static const char *altera_uart_type(struct uart_port *port)
 359{
 360        return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL;
 361}
 362
 363static int altera_uart_request_port(struct uart_port *port)
 364{
 365        /* UARTs always present */
 366        return 0;
 367}
 368
 369static void altera_uart_release_port(struct uart_port *port)
 370{
 371        /* Nothing to release... */
 372}
 373
 374static int altera_uart_verify_port(struct uart_port *port,
 375                                   struct serial_struct *ser)
 376{
 377        if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART))
 378                return -EINVAL;
 379        return 0;
 380}
 381
 382#ifdef CONFIG_CONSOLE_POLL
 383static int altera_uart_poll_get_char(struct uart_port *port)
 384{
 385        while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 386                 ALTERA_UART_STATUS_RRDY_MSK))
 387                cpu_relax();
 388
 389        return altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
 390}
 391
 392static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c)
 393{
 394        while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 395                 ALTERA_UART_STATUS_TRDY_MSK))
 396                cpu_relax();
 397
 398        altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
 399}
 400#endif
 401
 402/*
 403 *      Define the basic serial functions we support.
 404 */
 405static struct uart_ops altera_uart_ops = {
 406        .tx_empty       = altera_uart_tx_empty,
 407        .get_mctrl      = altera_uart_get_mctrl,
 408        .set_mctrl      = altera_uart_set_mctrl,
 409        .start_tx       = altera_uart_start_tx,
 410        .stop_tx        = altera_uart_stop_tx,
 411        .stop_rx        = altera_uart_stop_rx,
 412        .enable_ms      = altera_uart_enable_ms,
 413        .break_ctl      = altera_uart_break_ctl,
 414        .startup        = altera_uart_startup,
 415        .shutdown       = altera_uart_shutdown,
 416        .set_termios    = altera_uart_set_termios,
 417        .type           = altera_uart_type,
 418        .request_port   = altera_uart_request_port,
 419        .release_port   = altera_uart_release_port,
 420        .config_port    = altera_uart_config_port,
 421        .verify_port    = altera_uart_verify_port,
 422#ifdef CONFIG_CONSOLE_POLL
 423        .poll_get_char  = altera_uart_poll_get_char,
 424        .poll_put_char  = altera_uart_poll_put_char,
 425#endif
 426};
 427
 428static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
 429
 430#if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
 431
 432static void altera_uart_console_putc(struct uart_port *port, const char c)
 433{
 434        while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 435                 ALTERA_UART_STATUS_TRDY_MSK))
 436                cpu_relax();
 437
 438        writel(c, port->membase + ALTERA_UART_TXDATA_REG);
 439}
 440
 441static void altera_uart_console_write(struct console *co, const char *s,
 442                                      unsigned int count)
 443{
 444        struct uart_port *port = &(altera_uart_ports + co->index)->port;
 445
 446        for (; count; count--, s++) {
 447                altera_uart_console_putc(port, *s);
 448                if (*s == '\n')
 449                        altera_uart_console_putc(port, '\r');
 450        }
 451}
 452
 453static int __init altera_uart_console_setup(struct console *co, char *options)
 454{
 455        struct uart_port *port;
 456        int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
 457        int bits = 8;
 458        int parity = 'n';
 459        int flow = 'n';
 460
 461        if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
 462                return -EINVAL;
 463        port = &altera_uart_ports[co->index].port;
 464        if (!port->membase)
 465                return -ENODEV;
 466
 467        if (options)
 468                uart_parse_options(options, &baud, &parity, &bits, &flow);
 469
 470        return uart_set_options(port, co, baud, parity, bits, flow);
 471}
 472
 473static struct uart_driver altera_uart_driver;
 474
 475static struct console altera_uart_console = {
 476        .name   = "ttyAL",
 477        .write  = altera_uart_console_write,
 478        .device = uart_console_device,
 479        .setup  = altera_uart_console_setup,
 480        .flags  = CON_PRINTBUFFER,
 481        .index  = -1,
 482        .data   = &altera_uart_driver,
 483};
 484
 485static int __init altera_uart_console_init(void)
 486{
 487        register_console(&altera_uart_console);
 488        return 0;
 489}
 490
 491console_initcall(altera_uart_console_init);
 492
 493#define ALTERA_UART_CONSOLE     (&altera_uart_console)
 494
 495#else
 496
 497#define ALTERA_UART_CONSOLE     NULL
 498
 499#endif /* CONFIG_ALTERA_UART_CONSOLE */
 500
 501/*
 502 *      Define the altera_uart UART driver structure.
 503 */
 504static struct uart_driver altera_uart_driver = {
 505        .owner          = THIS_MODULE,
 506        .driver_name    = DRV_NAME,
 507        .dev_name       = "ttyAL",
 508        .major          = SERIAL_ALTERA_MAJOR,
 509        .minor          = SERIAL_ALTERA_MINOR,
 510        .nr             = CONFIG_SERIAL_ALTERA_UART_MAXPORTS,
 511        .cons           = ALTERA_UART_CONSOLE,
 512};
 513
 514#ifdef CONFIG_OF
 515static int altera_uart_get_of_uartclk(struct platform_device *pdev,
 516                                      struct uart_port *port)
 517{
 518        int len;
 519        const __be32 *clk;
 520
 521        clk = of_get_property(pdev->dev.of_node, "clock-frequency", &len);
 522        if (!clk || len < sizeof(__be32))
 523                return -ENODEV;
 524
 525        port->uartclk = be32_to_cpup(clk);
 526
 527        return 0;
 528}
 529#else
 530static int altera_uart_get_of_uartclk(struct platform_device *pdev,
 531                                      struct uart_port *port)
 532{
 533        return -ENODEV;
 534}
 535#endif /* CONFIG_OF */
 536
 537static int altera_uart_probe(struct platform_device *pdev)
 538{
 539        struct altera_uart_platform_uart *platp = dev_get_platdata(&pdev->dev);
 540        struct uart_port *port;
 541        struct resource *res_mem;
 542        struct resource *res_irq;
 543        int i = pdev->id;
 544        int ret;
 545
 546        /* if id is -1 scan for a free id and use that one */
 547        if (i == -1) {
 548                for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++)
 549                        if (altera_uart_ports[i].port.mapbase == 0)
 550                                break;
 551        }
 552
 553        if (i < 0 || i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
 554                return -EINVAL;
 555
 556        port = &altera_uart_ports[i].port;
 557
 558        res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 559        if (res_mem)
 560                port->mapbase = res_mem->start;
 561        else if (platp)
 562                port->mapbase = platp->mapbase;
 563        else
 564                return -EINVAL;
 565
 566        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 567        if (res_irq)
 568                port->irq = res_irq->start;
 569        else if (platp)
 570                port->irq = platp->irq;
 571
 572        /* Check platform data first so we can override device node data */
 573        if (platp)
 574                port->uartclk = platp->uartclk;
 575        else {
 576                ret = altera_uart_get_of_uartclk(pdev, port);
 577                if (ret)
 578                        return ret;
 579        }
 580
 581        port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
 582        if (!port->membase)
 583                return -ENOMEM;
 584
 585        if (platp)
 586                port->regshift = platp->bus_shift;
 587        else
 588                port->regshift = 0;
 589
 590        port->line = i;
 591        port->type = PORT_ALTERA_UART;
 592        port->iotype = SERIAL_IO_MEM;
 593        port->ops = &altera_uart_ops;
 594        port->flags = UPF_BOOT_AUTOCONF;
 595
 596        platform_set_drvdata(pdev, port);
 597
 598        uart_add_one_port(&altera_uart_driver, port);
 599
 600        return 0;
 601}
 602
 603static int altera_uart_remove(struct platform_device *pdev)
 604{
 605        struct uart_port *port = platform_get_drvdata(pdev);
 606
 607        if (port) {
 608                uart_remove_one_port(&altera_uart_driver, port);
 609                port->mapbase = 0;
 610        }
 611
 612        return 0;
 613}
 614
 615#ifdef CONFIG_OF
 616static struct of_device_id altera_uart_match[] = {
 617        { .compatible = "ALTR,uart-1.0", },
 618        { .compatible = "altr,uart-1.0", },
 619        {},
 620};
 621MODULE_DEVICE_TABLE(of, altera_uart_match);
 622#endif /* CONFIG_OF */
 623
 624static struct platform_driver altera_uart_platform_driver = {
 625        .probe  = altera_uart_probe,
 626        .remove = altera_uart_remove,
 627        .driver = {
 628                .name           = DRV_NAME,
 629                .owner          = THIS_MODULE,
 630                .of_match_table = of_match_ptr(altera_uart_match),
 631        },
 632};
 633
 634static int __init altera_uart_init(void)
 635{
 636        int rc;
 637
 638        rc = uart_register_driver(&altera_uart_driver);
 639        if (rc)
 640                return rc;
 641        rc = platform_driver_register(&altera_uart_platform_driver);
 642        if (rc)
 643                uart_unregister_driver(&altera_uart_driver);
 644        return rc;
 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