vr41xx_siu.c

Go to the documentation of this file.

/*
 *  Driver for NEC VR4100 series Serial Interface Unit.
 *
 *  Copyright (C) 2004-2008  Yoichi Yuasa <[email protected]>
 *
 *  Based on drivers/serial/8250.c, by Russell King.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif

#include <linux/console.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>

#include <asm/io.h>
#include <asm/vr41xx/siu.h>
#include <asm/vr41xx/vr41xx.h>

#define SIU_BAUD_BASE   1152000
#define SIU_MAJOR   204
#define SIU_MINOR_BASE  82

#define RX_MAX_COUNT    256
#define TX_MAX_COUNT    15

#define SIUIRSEL    0x08
 #define TMICMODE   0x20
 #define TMICTX     0x10
 #define IRMSEL     0x0c
 #define IRMSEL_HP  0x08
 #define IRMSEL_TEMIC   0x04
 #define IRMSEL_SHARP   0x00
 #define IRUSESEL   0x02
 #define SIRSEL     0x01

static struct uart_port siu_uart_ports[SIU_PORTS_MAX] = {
    [0 ... SIU_PORTS_MAX-1] = {
        .lock   = __SPIN_LOCK_UNLOCKED(siu_uart_ports->lock),
        .irq    = 0,
    },
};

#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
static uint8_t lsr_break_flag[SIU_PORTS_MAX];
#endif

#define siu_read(port, offset)      readb((port)->membase + (offset))
#define siu_write(port, offset, value)  writeb((value), (port)->membase + (offset))

void vr41xx_select_siu_interface(siu_interface_t interface)
{
    struct uart_port *port;
    unsigned long flags;
    uint8_t irsel;

    port = &siu_uart_ports[0];

    spin_lock_irqsave(&port->lock, flags);

    irsel = siu_read(port, SIUIRSEL);
    if (interface == SIU_INTERFACE_IRDA)
        irsel |= SIRSEL;
    else
        irsel &= ~SIRSEL;
    siu_write(port, SIUIRSEL, irsel);

    spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);

void vr41xx_use_irda(irda_use_t use)
{
    struct uart_port *port;
    unsigned long flags;
    uint8_t irsel;

    port = &siu_uart_ports[0];

    spin_lock_irqsave(&port->lock, flags);

    irsel = siu_read(port, SIUIRSEL);
    if (use == FIR_USE_IRDA)
        irsel |= IRUSESEL;
    else
        irsel &= ~IRUSESEL;
    siu_write(port, SIUIRSEL, irsel);

    spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL_GPL(vr41xx_use_irda);

void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
{
    struct uart_port *port;
    unsigned long flags;
    uint8_t irsel;

    port = &siu_uart_ports[0];

    spin_lock_irqsave(&port->lock, flags);

    irsel = siu_read(port, SIUIRSEL);
    irsel &= ~(IRMSEL | TMICTX | TMICMODE);
    switch (module) {
    case SHARP_IRDA:
        irsel |= IRMSEL_SHARP;
        break;
    case TEMIC_IRDA:
        irsel |= IRMSEL_TEMIC | TMICMODE;
        if (speed == IRDA_TX_4MBPS)
            irsel |= TMICTX;
        break;
    case HP_IRDA:
        irsel |= IRMSEL_HP;
        break;
    default:
        break;
    }
    siu_write(port, SIUIRSEL, irsel);

    spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);

static inline void siu_clear_fifo(struct uart_port *port)
{
    siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
    siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
                              UART_FCR_CLEAR_XMIT);
    siu_write(port, UART_FCR, 0);
}

static inline unsigned long siu_port_size(struct uart_port *port)
{
    switch (port->type) {
    case PORT_VR41XX_SIU:
        return 11UL;
    case PORT_VR41XX_DSIU:
        return 8UL;
    }

    return 0;
}

static inline unsigned int siu_check_type(struct uart_port *port)
{
    if (port->line == 0)
        return PORT_VR41XX_SIU;
    if (port->line == 1 && port->irq)
        return PORT_VR41XX_DSIU;

    return PORT_UNKNOWN;
}

static inline const char *siu_type_name(struct uart_port *port)
{
    switch (port->type) {
    case PORT_VR41XX_SIU:
        return "SIU";
    case PORT_VR41XX_DSIU:
        return "DSIU";
    }

    return NULL;
}

static unsigned int siu_tx_empty(struct uart_port *port)
{
    uint8_t lsr;

    lsr = siu_read(port, UART_LSR);
    if (lsr & UART_LSR_TEMT)
        return TIOCSER_TEMT;

    return 0;
}

static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
    uint8_t mcr = 0;

    if (mctrl & TIOCM_DTR)
        mcr |= UART_MCR_DTR;
    if (mctrl & TIOCM_RTS)
        mcr |= UART_MCR_RTS;
    if (mctrl & TIOCM_OUT1)
        mcr |= UART_MCR_OUT1;
    if (mctrl & TIOCM_OUT2)
        mcr |= UART_MCR_OUT2;
    if (mctrl & TIOCM_LOOP)
        mcr |= UART_MCR_LOOP;

    siu_write(port, UART_MCR, mcr);
}

static unsigned int siu_get_mctrl(struct uart_port *port)
{
    uint8_t msr;
    unsigned int mctrl = 0;

    msr = siu_read(port, UART_MSR);
    if (msr & UART_MSR_DCD)
        mctrl |= TIOCM_CAR;
    if (msr & UART_MSR_RI)
        mctrl |= TIOCM_RNG;
    if (msr & UART_MSR_DSR)
        mctrl |= TIOCM_DSR;
    if (msr & UART_MSR_CTS)
        mctrl |= TIOCM_CTS;

    return mctrl;
}

static void siu_stop_tx(struct uart_port *port)
{
    unsigned long flags;
    uint8_t ier;

    spin_lock_irqsave(&port->lock, flags);

    ier = siu_read(port, UART_IER);
    ier &= ~UART_IER_THRI;
    siu_write(port, UART_IER, ier);

    spin_unlock_irqrestore(&port->lock, flags);
}

static void siu_start_tx(struct uart_port *port)
{
    unsigned long flags;
    uint8_t ier;

    spin_lock_irqsave(&port->lock, flags);

    ier = siu_read(port, UART_IER);
    ier |= UART_IER_THRI;
    siu_write(port, UART_IER, ier);

    spin_unlock_irqrestore(&port->lock, flags);
}

static void siu_stop_rx(struct uart_port *port)
{
    unsigned long flags;
    uint8_t ier;

    spin_lock_irqsave(&port->lock, flags);

    ier = siu_read(port, UART_IER);
    ier &= ~UART_IER_RLSI;
    siu_write(port, UART_IER, ier);

    port->read_status_mask &= ~UART_LSR_DR;

    spin_unlock_irqrestore(&port->lock, flags);
}

static void siu_enable_ms(struct uart_port *port)
{
    unsigned long flags;
    uint8_t ier;

    spin_lock_irqsave(&port->lock, flags);

    ier = siu_read(port, UART_IER);
    ier |= UART_IER_MSI;
    siu_write(port, UART_IER, ier);

    spin_unlock_irqrestore(&port->lock, flags);
}

static void siu_break_ctl(struct uart_port *port, int ctl)
{
    unsigned long flags;
    uint8_t lcr;

    spin_lock_irqsave(&port->lock, flags);

    lcr = siu_read(port, UART_LCR);
    if (ctl == -1)
        lcr |= UART_LCR_SBC;
    else
        lcr &= ~UART_LCR_SBC;
    siu_write(port, UART_LCR, lcr);

    spin_unlock_irqrestore(&port->lock, flags);
}

static inline void receive_chars(struct uart_port *port, uint8_t *status)
{
    struct tty_struct *tty;
    uint8_t lsr, ch;
    char flag;
    int max_count = RX_MAX_COUNT;

    tty = port->state->port.tty;
    lsr = *status;

    do {
        ch = siu_read(port, UART_RX);
        port->icount.rx++;
        flag = TTY_NORMAL;

#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
        lsr |= lsr_break_flag[port->line];
        lsr_break_flag[port->line] = 0;
#endif
        if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
                            UART_LSR_PE | UART_LSR_OE))) {
            if (lsr & UART_LSR_BI) {
                lsr &= ~(UART_LSR_FE | UART_LSR_PE);
                port->icount.brk++;

                if (uart_handle_break(port))
                    goto ignore_char;
            }

            if (lsr & UART_LSR_FE)
                port->icount.frame++;
            if (lsr & UART_LSR_PE)
                port->icount.parity++;
            if (lsr & UART_LSR_OE)
                port->icount.overrun++;

            lsr &= port->read_status_mask;
            if (lsr & UART_LSR_BI)
                flag = TTY_BREAK;
            if (lsr & UART_LSR_FE)
                flag = TTY_FRAME;
            if (lsr & UART_LSR_PE)
                flag = TTY_PARITY;
        }

        if (uart_handle_sysrq_char(port, ch))
            goto ignore_char;

        uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);

    ignore_char:
        lsr = siu_read(port, UART_LSR);
    } while ((lsr & UART_LSR_DR) && (max_count-- > 0));

    tty_flip_buffer_push(tty);

    *status = lsr;
}

static inline void check_modem_status(struct uart_port *port)
{
    uint8_t msr;

    msr = siu_read(port, UART_MSR);
    if ((msr & UART_MSR_ANY_DELTA) == 0)
        return;
    if (msr & UART_MSR_DDCD)
        uart_handle_dcd_change(port, msr & UART_MSR_DCD);
    if (msr & UART_MSR_TERI)
        port->icount.rng++;
    if (msr & UART_MSR_DDSR)
        port->icount.dsr++;
    if (msr & UART_MSR_DCTS)
        uart_handle_cts_change(port, msr & UART_MSR_CTS);

    wake_up_interruptible(&port->state->port.delta_msr_wait);
}

static inline void transmit_chars(struct uart_port *port)
{
    struct circ_buf *xmit;
    int max_count = TX_MAX_COUNT;

    xmit = &port->state->xmit;

    if (port->x_char) {
        siu_write(port, UART_TX, port->x_char);
        port->icount.tx++;
        port->x_char = 0;
        return;
    }

    if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
        siu_stop_tx(port);
        return;
    }

    do {
        siu_write(port, UART_TX, xmit->buf[xmit->tail]);
        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
        port->icount.tx++;
        if (uart_circ_empty(xmit))
            break;
    } while (max_count-- > 0);

    if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
        uart_write_wakeup(port);

    if (uart_circ_empty(xmit))
        siu_stop_tx(port);
}

static irqreturn_t siu_interrupt(int irq, void *dev_id)
{
    struct uart_port *port;
    uint8_t iir, lsr;

    port = (struct uart_port *)dev_id;

    iir = siu_read(port, UART_IIR);
    if (iir & UART_IIR_NO_INT)
        return IRQ_NONE;

    lsr = siu_read(port, UART_LSR);
    if (lsr & UART_LSR_DR)
        receive_chars(port, &lsr);

    check_modem_status(port);

    if (lsr & UART_LSR_THRE)
        transmit_chars(port);

    return IRQ_HANDLED;
}

static int siu_startup(struct uart_port *port)
{
    int retval;

    if (port->membase == NULL)
        return -ENODEV;

    siu_clear_fifo(port);

    (void)siu_read(port, UART_LSR);
    (void)siu_read(port, UART_RX);
    (void)siu_read(port, UART_IIR);
    (void)siu_read(port, UART_MSR);

    if (siu_read(port, UART_LSR) == 0xff)
        return -ENODEV;

    retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
    if (retval)
        return retval;

    if (port->type == PORT_VR41XX_DSIU)
        vr41xx_enable_dsiuint(DSIUINT_ALL);

    siu_write(port, UART_LCR, UART_LCR_WLEN8);

    spin_lock_irq(&port->lock);
    siu_set_mctrl(port, port->mctrl);
    spin_unlock_irq(&port->lock);

    siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);

    (void)siu_read(port, UART_LSR);
    (void)siu_read(port, UART_RX);
    (void)siu_read(port, UART_IIR);
    (void)siu_read(port, UART_MSR);

    return 0;
}

static void siu_shutdown(struct uart_port *port)
{
    unsigned long flags;
    uint8_t lcr;

    siu_write(port, UART_IER, 0);

    spin_lock_irqsave(&port->lock, flags);

    port->mctrl &= ~TIOCM_OUT2;
    siu_set_mctrl(port, port->mctrl);

    spin_unlock_irqrestore(&port->lock, flags);

    lcr = siu_read(port, UART_LCR);
    lcr &= ~UART_LCR_SBC;
    siu_write(port, UART_LCR, lcr);

    siu_clear_fifo(port);

    (void)siu_read(port, UART_RX);

    if (port->type == PORT_VR41XX_DSIU)
        vr41xx_disable_dsiuint(DSIUINT_ALL);

    free_irq(port->irq, port);
}

static void siu_set_termios(struct uart_port *port, struct ktermios *new,
                            struct ktermios *old)
{
    tcflag_t c_cflag, c_iflag;
    uint8_t lcr, fcr, ier;
    unsigned int baud, quot;
    unsigned long flags;

    c_cflag = new->c_cflag;
    switch (c_cflag & CSIZE) {
    case CS5:
        lcr = UART_LCR_WLEN5;
        break;
    case CS6:
        lcr = UART_LCR_WLEN6;
        break;
    case CS7:
        lcr = UART_LCR_WLEN7;
        break;
    default:
        lcr = UART_LCR_WLEN8;
        break;
    }

    if (c_cflag & CSTOPB)
        lcr |= UART_LCR_STOP;
    if (c_cflag & PARENB)
        lcr |= UART_LCR_PARITY;
    if ((c_cflag & PARODD) != PARODD)
        lcr |= UART_LCR_EPAR;
    if (c_cflag & CMSPAR)
        lcr |= UART_LCR_SPAR;

    baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
    quot = uart_get_divisor(port, baud);

    fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;

    spin_lock_irqsave(&port->lock, flags);

    uart_update_timeout(port, c_cflag, baud);

    c_iflag = new->c_iflag;

    port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
    if (c_iflag & INPCK)
        port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
    if (c_iflag & (BRKINT | PARMRK))
        port->read_status_mask |= UART_LSR_BI;

    port->ignore_status_mask = 0;
    if (c_iflag & IGNPAR)
        port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
    if (c_iflag & IGNBRK) {
        port->ignore_status_mask |= UART_LSR_BI;
        if (c_iflag & IGNPAR)
            port->ignore_status_mask |= UART_LSR_OE;
    }

    if ((c_cflag & CREAD) == 0)
        port->ignore_status_mask |= UART_LSR_DR;

    ier = siu_read(port, UART_IER);
    ier &= ~UART_IER_MSI;
    if (UART_ENABLE_MS(port, c_cflag))
        ier |= UART_IER_MSI;
    siu_write(port, UART_IER, ier);

    siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);

    siu_write(port, UART_DLL, (uint8_t)quot);
    siu_write(port, UART_DLM, (uint8_t)(quot >> 8));

    siu_write(port, UART_LCR, lcr);

    siu_write(port, UART_FCR, fcr);

    siu_set_mctrl(port, port->mctrl);

    spin_unlock_irqrestore(&port->lock, flags);
}

static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
{
    switch (state) {
    case 0:
        switch (port->type) {
        case PORT_VR41XX_SIU:
            vr41xx_supply_clock(SIU_CLOCK);
            break;
        case PORT_VR41XX_DSIU:
            vr41xx_supply_clock(DSIU_CLOCK);
            break;
        }
        break;
    case 3:
        switch (port->type) {
        case PORT_VR41XX_SIU:
            vr41xx_mask_clock(SIU_CLOCK);
            break;
        case PORT_VR41XX_DSIU:
            vr41xx_mask_clock(DSIU_CLOCK);
            break;
        }
        break;
    }
}

static const char *siu_type(struct uart_port *port)
{
    return siu_type_name(port);
}

static void siu_release_port(struct uart_port *port)
{
    unsigned long size;

    if (port->flags & UPF_IOREMAP) {
        iounmap(port->membase);
        port->membase = NULL;
    }

    size = siu_port_size(port);
    release_mem_region(port->mapbase, size);
}

static int siu_request_port(struct uart_port *port)
{
    unsigned long size;
    struct resource *res;

    size = siu_port_size(port);
    res = request_mem_region(port->mapbase, size, siu_type_name(port));
    if (res == NULL)
        return -EBUSY;

    if (port->flags & UPF_IOREMAP) {
        port->membase = ioremap(port->mapbase, size);
        if (port->membase == NULL) {
            release_resource(res);
            return -ENOMEM;
        }
    }

    return 0;
}

static void siu_config_port(struct uart_port *port, int flags)
{
    if (flags & UART_CONFIG_TYPE) {
        port->type = siu_check_type(port);
        (void)siu_request_port(port);
    }
}

static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
{
    if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
        return -EINVAL;
    if (port->irq != serial->irq)
        return -EINVAL;
    if (port->iotype != serial->io_type)
        return -EINVAL;
    if (port->mapbase != (unsigned long)serial->iomem_base)
        return -EINVAL;

    return 0;
}

static struct uart_ops siu_uart_ops = {
    .tx_empty   = siu_tx_empty,
    .set_mctrl  = siu_set_mctrl,
    .get_mctrl  = siu_get_mctrl,
    .stop_tx    = siu_stop_tx,
    .start_tx   = siu_start_tx,
    .stop_rx    = siu_stop_rx,
    .enable_ms  = siu_enable_ms,
    .break_ctl  = siu_break_ctl,
    .startup    = siu_startup,
    .shutdown   = siu_shutdown,
    .set_termios    = siu_set_termios,
    .pm     = siu_pm,
    .type       = siu_type,
    .release_port   = siu_release_port,
    .request_port   = siu_request_port,
    .config_port    = siu_config_port,
    .verify_port    = siu_verify_port,
};

static int siu_init_ports(struct platform_device *pdev)
{
    struct uart_port *port;
    struct resource *res;
    int *type = pdev->dev.platform_data;
    int i;

    if (!type)
        return 0;

    port = siu_uart_ports;
    for (i = 0; i < SIU_PORTS_MAX; i++) {
        port->type = type[i];
        if (port->type == PORT_UNKNOWN)
            continue;
        port->irq = platform_get_irq(pdev, i);
        port->uartclk = SIU_BAUD_BASE * 16;
        port->fifosize = 16;
        port->regshift = 0;
        port->iotype = UPIO_MEM;
        port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
        port->line = i;
        res = platform_get_resource(pdev, IORESOURCE_MEM, i);
        port->mapbase = res->start;
        port++;
    }

    return i;
}

#ifdef CONFIG_SERIAL_VR41XX_CONSOLE

#define BOTH_EMPTY  (UART_LSR_TEMT | UART_LSR_THRE)

static void wait_for_xmitr(struct uart_port *port)
{
    int timeout = 10000;
    uint8_t lsr, msr;

    do {
        lsr = siu_read(port, UART_LSR);
        if (lsr & UART_LSR_BI)
            lsr_break_flag[port->line] = UART_LSR_BI;

        if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
            break;
    } while (timeout-- > 0);

    if (port->flags & UPF_CONS_FLOW) {
        timeout = 1000000;

        do {
            msr = siu_read(port, UART_MSR);
            if ((msr & UART_MSR_CTS) != 0)
                break;
        } while (timeout-- > 0);
    }
}

static void siu_console_putchar(struct uart_port *port, int ch)
{
    wait_for_xmitr(port);
    siu_write(port, UART_TX, ch);
}

static void siu_console_write(struct console *con, const char *s, unsigned count)
{
    struct uart_port *port;
    uint8_t ier;

    port = &siu_uart_ports[con->index];

    ier = siu_read(port, UART_IER);
    siu_write(port, UART_IER, 0);

    uart_console_write(port, s, count, siu_console_putchar);

    wait_for_xmitr(port);
    siu_write(port, UART_IER, ier);
}

static int __init siu_console_setup(struct console *con, char *options)
{
    struct uart_port *port;
    int baud = 9600;
    int parity = 'n';
    int bits = 8;
    int flow = 'n';

    if (con->index >= SIU_PORTS_MAX)
        con->index = 0;

    port = &siu_uart_ports[con->index];
    if (port->membase == NULL) {
        if (port->mapbase == 0)
            return -ENODEV;
        port->membase = ioremap(port->mapbase, siu_port_size(port));
    }

    if (port->type == PORT_VR41XX_SIU)
        vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);

    if (options != NULL)
        uart_parse_options(options, &baud, &parity, &bits, &flow);

    return uart_set_options(port, con, baud, parity, bits, flow);
}

static struct uart_driver siu_uart_driver;

static struct console siu_console = {
    .name   = "ttyVR",
    .write  = siu_console_write,
    .device = uart_console_device,
    .setup  = siu_console_setup,
    .flags  = CON_PRINTBUFFER,
    .index  = -1,
    .data   = &siu_uart_driver,
};

static int __devinit siu_console_init(void)
{
    struct uart_port *port;
    int i;

    for (i = 0; i < SIU_PORTS_MAX; i++) {
        port = &siu_uart_ports[i];
        port->ops = &siu_uart_ops;
    }

    register_console(&siu_console);

    return 0;
}

console_initcall(siu_console_init);

void __init vr41xx_siu_early_setup(struct uart_port *port)
{
    if (port->type == PORT_UNKNOWN)
        return;

    siu_uart_ports[port->line].line = port->line;
    siu_uart_ports[port->line].type = port->type;
    siu_uart_ports[port->line].uartclk = SIU_BAUD_BASE * 16;
    siu_uart_ports[port->line].mapbase = port->mapbase;
    siu_uart_ports[port->line].mapbase = port->mapbase;
    siu_uart_ports[port->line].ops = &siu_uart_ops;
}

#define SERIAL_VR41XX_CONSOLE   &siu_console
#else
#define SERIAL_VR41XX_CONSOLE   NULL
#endif

static struct uart_driver siu_uart_driver = {
    .owner      = THIS_MODULE,
    .driver_name    = "SIU",
    .dev_name   = "ttyVR",
    .major      = SIU_MAJOR,
    .minor      = SIU_MINOR_BASE,
    .cons       = SERIAL_VR41XX_CONSOLE,
};

static int __devinit siu_probe(struct platform_device *dev)
{
    struct uart_port *port;
    int num, i, retval;

    num = siu_init_ports(dev);
    if (num <= 0)
        return -ENODEV;

    siu_uart_driver.nr = num;
    retval = uart_register_driver(&siu_uart_driver);
    if (retval)
        return retval;

    for (i = 0; i < num; i++) {
        port = &siu_uart_ports[i];
        port->ops = &siu_uart_ops;
        port->dev = &dev->dev;

        retval = uart_add_one_port(&siu_uart_driver, port);
        if (retval < 0) {
            port->dev = NULL;
            break;
        }
    }

    if (i == 0 && retval < 0) {
        uart_unregister_driver(&siu_uart_driver);
        return retval;
    }

    return 0;
}

static int __devexit siu_remove(struct platform_device *dev)
{
    struct uart_port *port;
    int i;

    for (i = 0; i < siu_uart_driver.nr; i++) {
        port = &siu_uart_ports[i];
        if (port->dev == &dev->dev) {
            uart_remove_one_port(&siu_uart_driver, port);
            port->dev = NULL;
        }
    }

    uart_unregister_driver(&siu_uart_driver);

    return 0;
}

static int siu_suspend(struct platform_device *dev, pm_message_t state)
{
    struct uart_port *port;
    int i;

    for (i = 0; i < siu_uart_driver.nr; i++) {
        port = &siu_uart_ports[i];
        if ((port->type == PORT_VR41XX_SIU ||
             port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
            uart_suspend_port(&siu_uart_driver, port);

    }

    return 0;
}

static int siu_resume(struct platform_device *dev)
{
    struct uart_port *port;
    int i;

    for (i = 0; i < siu_uart_driver.nr; i++) {
        port = &siu_uart_ports[i];
        if ((port->type == PORT_VR41XX_SIU ||
             port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
            uart_resume_port(&siu_uart_driver, port);
    }

    return 0;
}

static struct platform_driver siu_device_driver = {
    .probe      = siu_probe,
    .remove     = __devexit_p(siu_remove),
    .suspend    = siu_suspend,
    .resume     = siu_resume,
    .driver     = {
        .name   = "SIU",
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(siu_device_driver);

MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:SIU");