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sunsu.c

/* $Id: su.c,v 1.55 2002/01/08 16:00:16 davem Exp $
 * su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
 *
 * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
 * Copyright (C) 1998-1999  Pete Zaitcev   (zaitcev@yahoo.com)
 *
 * This is mainly a variation of 8250.c, credits go to authors mentioned
 * therein.  In fact this driver should be merged into the generic 8250.c
 * infrastructure perhaps using a 8250_sparc.c module.
 *
 * Fixed to use tty_get_baud_rate().
 *   Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
 *
 * Converted to new 2.5.x UART layer.
 *   David S. Miller (davem@davemloft.net), 2002-Jul-29
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/circ_buf.h>
#include <linux/serial.h>
#include <linux/sysrq.h>
#include <linux/console.h>
#ifdef CONFIG_SERIO
#include <linux/serio.h>
#endif
#include <linux/serial_reg.h>
#include <linux/init.h>
#include <linux/delay.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/prom.h>
#include <asm/of_device.h>

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

#include <linux/serial_core.h>

#include "suncore.h"

/* We are on a NS PC87303 clocked with 24.0 MHz, which results
 * in a UART clock of 1.8462 MHz.
 */
#define SU_BASE_BAUD    (1846200 / 16)

enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT };
static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" };

/*
 * Here we define the default xmit fifo size used for each type of UART.
 */
static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = {
      { "unknown",      1,    0 },
      { "8250",   1,    0 },
      { "16450",  1,    0 },
      { "16550",  1,    0 },
      { "16550A", 16,   UART_CLEAR_FIFO | UART_USE_FIFO },
      { "Cirrus", 1,    0 },
      { "ST16650",      1,    UART_CLEAR_FIFO | UART_STARTECH },
      { "ST16650V2",    32,   UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
      { "TI16750",      64,   UART_CLEAR_FIFO | UART_USE_FIFO },
      { "Startech",     1,    0 },
      { "16C950/954",   128,  UART_CLEAR_FIFO | UART_USE_FIFO },
      { "ST16654",      64,   UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
      { "XR16850",      128,  UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
      { "RSA",    2048, UART_CLEAR_FIFO | UART_USE_FIFO }
};

struct uart_sunsu_port {
      struct uart_port  port;
      unsigned char           acr;
      unsigned char           ier;
      unsigned short          rev;
      unsigned char           lcr;
      unsigned int            lsr_break_flag;
      unsigned int            cflag;

      /* Probing information.  */
      enum su_type            su_type;
      unsigned int            type_probed;      /* XXX Stupid */
      unsigned long           reg_size;

#ifdef CONFIG_SERIO
      struct serio            serio;
      int               serio_open;
#endif
};

static unsigned int serial_in(struct uart_sunsu_port *up, int offset)
{
      offset <<= up->port.regshift;

      switch (up->port.iotype) {
      case UPIO_HUB6:
            outb(up->port.hub6 - 1 + offset, up->port.iobase);
            return inb(up->port.iobase + 1);

      case UPIO_MEM:
            return readb(up->port.membase + offset);

      default:
            return inb(up->port.iobase + offset);
      }
}

static void serial_out(struct uart_sunsu_port *up, int offset, int value)
{
#ifndef CONFIG_SPARC64
      /*
       * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
       * connected with a gate then go to SlavIO. When IRQ4 goes tristated
       * gate outputs a logical one. Since we use level triggered interrupts
       * we have lockup and watchdog reset. We cannot mask IRQ because
       * keyboard shares IRQ with us (Word has it as Bob Smelik's design).
       * This problem is similar to what Alpha people suffer, see serial.c.
       */
      if (offset == UART_MCR)
            value |= UART_MCR_OUT2;
#endif
      offset <<= up->port.regshift;

      switch (up->port.iotype) {
      case UPIO_HUB6:
            outb(up->port.hub6 - 1 + offset, up->port.iobase);
            outb(value, up->port.iobase + 1);
            break;

      case UPIO_MEM:
            writeb(value, up->port.membase + offset);
            break;

      default:
            outb(value, up->port.iobase + offset);
      }
}

/*
 * We used to support using pause I/O for certain machines.  We
 * haven't supported this for a while, but just in case it's badly
 * needed for certain old 386 machines, I've left these #define's
 * in....
 */
#define serial_inp(up, offset)            serial_in(up, offset)
#define serial_outp(up, offset, value)    serial_out(up, offset, value)


/*
 * For the 16C950
 */
static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
{
      serial_out(up, UART_SCR, offset);
      serial_out(up, UART_ICR, value);
}

#if 0 /* Unused currently */
static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset)
{
      unsigned int value;

      serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
      serial_out(up, UART_SCR, offset);
      value = serial_in(up, UART_ICR);
      serial_icr_write(up, UART_ACR, up->acr);

      return value;
}
#endif

#ifdef CONFIG_SERIAL_8250_RSA
/*
 * Attempts to turn on the RSA FIFO.  Returns zero on failure.
 * We set the port uart clock rate if we succeed.
 */
static int __enable_rsa(struct uart_sunsu_port *up)
{
      unsigned char mode;
      int result;

      mode = serial_inp(up, UART_RSA_MSR);
      result = mode & UART_RSA_MSR_FIFO;

      if (!result) {
            serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
            mode = serial_inp(up, UART_RSA_MSR);
            result = mode & UART_RSA_MSR_FIFO;
      }

      if (result)
            up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;

      return result;
}

static void enable_rsa(struct uart_sunsu_port *up)
{
      if (up->port.type == PORT_RSA) {
            if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
                  spin_lock_irq(&up->port.lock);
                  __enable_rsa(up);
                  spin_unlock_irq(&up->port.lock);
            }
            if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
                  serial_outp(up, UART_RSA_FRR, 0);
      }
}

/*
 * Attempts to turn off the RSA FIFO.  Returns zero on failure.
 * It is unknown why interrupts were disabled in here.  However,
 * the caller is expected to preserve this behaviour by grabbing
 * the spinlock before calling this function.
 */
static void disable_rsa(struct uart_sunsu_port *up)
{
      unsigned char mode;
      int result;

      if (up->port.type == PORT_RSA &&
          up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
            spin_lock_irq(&up->port.lock);

            mode = serial_inp(up, UART_RSA_MSR);
            result = !(mode & UART_RSA_MSR_FIFO);

            if (!result) {
                  serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
                  mode = serial_inp(up, UART_RSA_MSR);
                  result = !(mode & UART_RSA_MSR_FIFO);
            }

            if (result)
                  up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
            spin_unlock_irq(&up->port.lock);
      }
}
#endif /* CONFIG_SERIAL_8250_RSA */

static inline void __stop_tx(struct uart_sunsu_port *p)
{
      if (p->ier & UART_IER_THRI) {
            p->ier &= ~UART_IER_THRI;
            serial_out(p, UART_IER, p->ier);
      }
}

static void sunsu_stop_tx(struct uart_port *port)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;

      __stop_tx(up);

      /*
       * We really want to stop the transmitter from sending.
       */
      if (up->port.type == PORT_16C950) {
            up->acr |= UART_ACR_TXDIS;
            serial_icr_write(up, UART_ACR, up->acr);
      }
}

static void sunsu_start_tx(struct uart_port *port)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;

      if (!(up->ier & UART_IER_THRI)) {
            up->ier |= UART_IER_THRI;
            serial_out(up, UART_IER, up->ier);
      }

      /*
       * Re-enable the transmitter if we disabled it.
       */
      if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
            up->acr &= ~UART_ACR_TXDIS;
            serial_icr_write(up, UART_ACR, up->acr);
      }
}

static void sunsu_stop_rx(struct uart_port *port)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;

      up->ier &= ~UART_IER_RLSI;
      up->port.read_status_mask &= ~UART_LSR_DR;
      serial_out(up, UART_IER, up->ier);
}

static void sunsu_enable_ms(struct uart_port *port)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
      unsigned long flags;

      spin_lock_irqsave(&up->port.lock, flags);
      up->ier |= UART_IER_MSI;
      serial_out(up, UART_IER, up->ier);
      spin_unlock_irqrestore(&up->port.lock, flags);
}

static struct tty_struct *
receive_chars(struct uart_sunsu_port *up, unsigned char *status)
{
      struct tty_struct *tty = up->port.info->tty;
      unsigned char ch, flag;
      int max_count = 256;
      int saw_console_brk = 0;

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

            if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
                               UART_LSR_FE | UART_LSR_OE))) {
                  /*
                   * For statistics only
                   */
                  if (*status & UART_LSR_BI) {
                        *status &= ~(UART_LSR_FE | UART_LSR_PE);
                        up->port.icount.brk++;
                        if (up->port.cons != NULL &&
                            up->port.line == up->port.cons->index)
                              saw_console_brk = 1;
                        /*
                         * We do the SysRQ and SAK checking
                         * here because otherwise the break
                         * may get masked by ignore_status_mask
                         * or read_status_mask.
                         */
                        if (uart_handle_break(&up->port))
                              goto ignore_char;
                  } else if (*status & UART_LSR_PE)
                        up->port.icount.parity++;
                  else if (*status & UART_LSR_FE)
                        up->port.icount.frame++;
                  if (*status & UART_LSR_OE)
                        up->port.icount.overrun++;

                  /*
                   * Mask off conditions which should be ingored.
                   */
                  *status &= up->port.read_status_mask;

                  if (up->port.cons != NULL &&
                      up->port.line == up->port.cons->index) {
                        /* Recover the break flag from console xmit */
                        *status |= up->lsr_break_flag;
                        up->lsr_break_flag = 0;
                  }

                  if (*status & UART_LSR_BI) {
                        flag = TTY_BREAK;
                  } else if (*status & UART_LSR_PE)
                        flag = TTY_PARITY;
                  else if (*status & UART_LSR_FE)
                        flag = TTY_FRAME;
            }
            if (uart_handle_sysrq_char(&up->port, ch))
                  goto ignore_char;
            if ((*status & up->port.ignore_status_mask) == 0)
                  tty_insert_flip_char(tty, ch, flag);
            if (*status & UART_LSR_OE)
                  /*
                   * Overrun is special, since it's reported
                   * immediately, and doesn't affect the current
                   * character.
                   */
                   tty_insert_flip_char(tty, 0, TTY_OVERRUN);
      ignore_char:
            *status = serial_inp(up, UART_LSR);
      } while ((*status & UART_LSR_DR) && (max_count-- > 0));

      if (saw_console_brk)
            sun_do_break();

      return tty;
}

static void transmit_chars(struct uart_sunsu_port *up)
{
      struct circ_buf *xmit = &up->port.info->xmit;
      int count;

      if (up->port.x_char) {
            serial_outp(up, UART_TX, up->port.x_char);
            up->port.icount.tx++;
            up->port.x_char = 0;
            return;
      }
      if (uart_tx_stopped(&up->port)) {
            sunsu_stop_tx(&up->port);
            return;
      }
      if (uart_circ_empty(xmit)) {
            __stop_tx(up);
            return;
      }

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

      if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
            uart_write_wakeup(&up->port);

      if (uart_circ_empty(xmit))
            __stop_tx(up);
}

static void check_modem_status(struct uart_sunsu_port *up)
{
      int status;

      status = serial_in(up, UART_MSR);

      if ((status & UART_MSR_ANY_DELTA) == 0)
            return;

      if (status & UART_MSR_TERI)
            up->port.icount.rng++;
      if (status & UART_MSR_DDSR)
            up->port.icount.dsr++;
      if (status & UART_MSR_DDCD)
            uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
      if (status & UART_MSR_DCTS)
            uart_handle_cts_change(&up->port, status & UART_MSR_CTS);

      wake_up_interruptible(&up->port.info->delta_msr_wait);
}

static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
{
      struct uart_sunsu_port *up = dev_id;
      unsigned long flags;
      unsigned char status;

      spin_lock_irqsave(&up->port.lock, flags);

      do {
            struct tty_struct *tty;

            status = serial_inp(up, UART_LSR);
            tty = NULL;
            if (status & UART_LSR_DR)
                  tty = receive_chars(up, &status);
            check_modem_status(up);
            if (status & UART_LSR_THRE)
                  transmit_chars(up);

            spin_unlock_irqrestore(&up->port.lock, flags);

            if (tty)
                  tty_flip_buffer_push(tty);

            spin_lock_irqsave(&up->port.lock, flags);

      } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));

      spin_unlock_irqrestore(&up->port.lock, flags);

      return IRQ_HANDLED;
}

/* Separate interrupt handling path for keyboard/mouse ports.  */

static void
sunsu_change_speed(struct uart_port *port, unsigned int cflag,
               unsigned int iflag, unsigned int quot);

static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
{
      unsigned int cur_cflag = up->cflag;
      int quot, new_baud;

      up->cflag &= ~CBAUD;
      up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);

      quot = up->port.uartclk / (16 * new_baud);

      sunsu_change_speed(&up->port, up->cflag, 0, quot);
}

static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break)
{
      do {
            unsigned char ch = serial_inp(up, UART_RX);

            /* Stop-A is handled by drivers/char/keyboard.c now. */
            if (up->su_type == SU_PORT_KBD) {
#ifdef CONFIG_SERIO
                  serio_interrupt(&up->serio, ch, 0);
#endif
            } else if (up->su_type == SU_PORT_MS) {
                  int ret = suncore_mouse_baud_detection(ch, is_break);

                  switch (ret) {
                  case 2:
                        sunsu_change_mouse_baud(up);
                        /* fallthru */
                  case 1:
                        break;

                  case 0:
#ifdef CONFIG_SERIO
                        serio_interrupt(&up->serio, ch, 0);
#endif
                        break;
                  };
            }
      } while (serial_in(up, UART_LSR) & UART_LSR_DR);
}

static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id)
{
      struct uart_sunsu_port *up = dev_id;

      if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
            unsigned char status = serial_inp(up, UART_LSR);

            if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
                  receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0);
      }

      return IRQ_HANDLED;
}

static unsigned int sunsu_tx_empty(struct uart_port *port)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
      unsigned long flags;
      unsigned int ret;

      spin_lock_irqsave(&up->port.lock, flags);
      ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
      spin_unlock_irqrestore(&up->port.lock, flags);

      return ret;
}

static unsigned int sunsu_get_mctrl(struct uart_port *port)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
      unsigned char status;
      unsigned int ret;

      status = serial_in(up, UART_MSR);

      ret = 0;
      if (status & UART_MSR_DCD)
            ret |= TIOCM_CAR;
      if (status & UART_MSR_RI)
            ret |= TIOCM_RNG;
      if (status & UART_MSR_DSR)
            ret |= TIOCM_DSR;
      if (status & UART_MSR_CTS)
            ret |= TIOCM_CTS;
      return ret;
}

static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
      unsigned char mcr = 0;

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

      serial_out(up, UART_MCR, mcr);
}

static void sunsu_break_ctl(struct uart_port *port, int break_state)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
      unsigned long flags;

      spin_lock_irqsave(&up->port.lock, flags);
      if (break_state == -1)
            up->lcr |= UART_LCR_SBC;
      else
            up->lcr &= ~UART_LCR_SBC;
      serial_out(up, UART_LCR, up->lcr);
      spin_unlock_irqrestore(&up->port.lock, flags);
}

static int sunsu_startup(struct uart_port *port)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
      unsigned long flags;
      int retval;

      if (up->port.type == PORT_16C950) {
            /* Wake up and initialize UART */
            up->acr = 0;
            serial_outp(up, UART_LCR, 0xBF);
            serial_outp(up, UART_EFR, UART_EFR_ECB);
            serial_outp(up, UART_IER, 0);
            serial_outp(up, UART_LCR, 0);
            serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
            serial_outp(up, UART_LCR, 0xBF);
            serial_outp(up, UART_EFR, UART_EFR_ECB);
            serial_outp(up, UART_LCR, 0);
      }

#ifdef CONFIG_SERIAL_8250_RSA
      /*
       * If this is an RSA port, see if we can kick it up to the
       * higher speed clock.
       */
      enable_rsa(up);
#endif

      /*
       * Clear the FIFO buffers and disable them.
       * (they will be reenabled in set_termios())
       */
      if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
            serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
            serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
                        UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
            serial_outp(up, UART_FCR, 0);
      }

      /*
       * Clear the interrupt registers.
       */
      (void) serial_inp(up, UART_LSR);
      (void) serial_inp(up, UART_RX);
      (void) serial_inp(up, UART_IIR);
      (void) serial_inp(up, UART_MSR);

      /*
       * At this point, there's no way the LSR could still be 0xff;
       * if it is, then bail out, because there's likely no UART
       * here.
       */
      if (!(up->port.flags & UPF_BUGGY_UART) &&
          (serial_inp(up, UART_LSR) == 0xff)) {
            printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
            return -ENODEV;
      }

      if (up->su_type != SU_PORT_PORT) {
            retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
                             IRQF_SHARED, su_typev[up->su_type], up);
      } else {
            retval = request_irq(up->port.irq, sunsu_serial_interrupt,
                             IRQF_SHARED, su_typev[up->su_type], up);
      }
      if (retval) {
            printk("su: Cannot register IRQ %d\n", up->port.irq);
            return retval;
      }

      /*
       * Now, initialize the UART
       */
      serial_outp(up, UART_LCR, UART_LCR_WLEN8);

      spin_lock_irqsave(&up->port.lock, flags);

      up->port.mctrl |= TIOCM_OUT2;

      sunsu_set_mctrl(&up->port, up->port.mctrl);
      spin_unlock_irqrestore(&up->port.lock, flags);

      /*
       * Finally, enable interrupts.  Note: Modem status interrupts
       * are set via set_termios(), which will be occurring imminently
       * anyway, so we don't enable them here.
       */
      up->ier = UART_IER_RLSI | UART_IER_RDI;
      serial_outp(up, UART_IER, up->ier);

      if (up->port.flags & UPF_FOURPORT) {
            unsigned int icp;
            /*
             * Enable interrupts on the AST Fourport board
             */
            icp = (up->port.iobase & 0xfe0) | 0x01f;
            outb_p(0x80, icp);
            (void) inb_p(icp);
      }

      /*
       * And clear the interrupt registers again for luck.
       */
      (void) serial_inp(up, UART_LSR);
      (void) serial_inp(up, UART_RX);
      (void) serial_inp(up, UART_IIR);
      (void) serial_inp(up, UART_MSR);

      return 0;
}

static void sunsu_shutdown(struct uart_port *port)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
      unsigned long flags;

      /*
       * Disable interrupts from this port
       */
      up->ier = 0;
      serial_outp(up, UART_IER, 0);

      spin_lock_irqsave(&up->port.lock, flags);
      if (up->port.flags & UPF_FOURPORT) {
            /* reset interrupts on the AST Fourport board */
            inb((up->port.iobase & 0xfe0) | 0x1f);
            up->port.mctrl |= TIOCM_OUT1;
      } else
            up->port.mctrl &= ~TIOCM_OUT2;

      sunsu_set_mctrl(&up->port, up->port.mctrl);
      spin_unlock_irqrestore(&up->port.lock, flags);

      /*
       * Disable break condition and FIFOs
       */
      serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
      serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
                          UART_FCR_CLEAR_RCVR |
                          UART_FCR_CLEAR_XMIT);
      serial_outp(up, UART_FCR, 0);

#ifdef CONFIG_SERIAL_8250_RSA
      /*
       * Reset the RSA board back to 115kbps compat mode.
       */
      disable_rsa(up);
#endif

      /*
       * Read data port to reset things.
       */
      (void) serial_in(up, UART_RX);

      free_irq(up->port.irq, up);
}

static void
sunsu_change_speed(struct uart_port *port, unsigned int cflag,
               unsigned int iflag, unsigned int quot)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
      unsigned char cval, fcr = 0;
      unsigned long flags;

      switch (cflag & CSIZE) {
      case CS5:
            cval = 0x00;
            break;
      case CS6:
            cval = 0x01;
            break;
      case CS7:
            cval = 0x02;
            break;
      default:
      case CS8:
            cval = 0x03;
            break;
      }

      if (cflag & CSTOPB)
            cval |= 0x04;
      if (cflag & PARENB)
            cval |= UART_LCR_PARITY;
      if (!(cflag & PARODD))
            cval |= UART_LCR_EPAR;
#ifdef CMSPAR
      if (cflag & CMSPAR)
            cval |= UART_LCR_SPAR;
#endif

      /*
       * Work around a bug in the Oxford Semiconductor 952 rev B
       * chip which causes it to seriously miscalculate baud rates
       * when DLL is 0.
       */
      if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
          up->rev == 0x5201)
            quot ++;

      if (uart_config[up->port.type].flags & UART_USE_FIFO) {
            if ((up->port.uartclk / quot) < (2400 * 16))
                  fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
#ifdef CONFIG_SERIAL_8250_RSA
            else if (up->port.type == PORT_RSA)
                  fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
#endif
            else
                  fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
      }
      if (up->port.type == PORT_16750)
            fcr |= UART_FCR7_64BYTE;

      /*
       * Ok, we're now changing the port state.  Do it with
       * interrupts disabled.
       */
      spin_lock_irqsave(&up->port.lock, flags);

      /*
       * Update the per-port timeout.
       */
      uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));

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

      /*
       * Characteres to ignore
       */
      up->port.ignore_status_mask = 0;
      if (iflag & IGNPAR)
            up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
      if (iflag & IGNBRK) {
            up->port.ignore_status_mask |= UART_LSR_BI;
            /*
             * If we're ignoring parity and break indicators,
             * ignore overruns too (for real raw support).
             */
            if (iflag & IGNPAR)
                  up->port.ignore_status_mask |= UART_LSR_OE;
      }

      /*
       * ignore all characters if CREAD is not set
       */
      if ((cflag & CREAD) == 0)
            up->port.ignore_status_mask |= UART_LSR_DR;

      /*
       * CTS flow control flag and modem status interrupts
       */
      up->ier &= ~UART_IER_MSI;
      if (UART_ENABLE_MS(&up->port, cflag))
            up->ier |= UART_IER_MSI;

      serial_out(up, UART_IER, up->ier);

      if (uart_config[up->port.type].flags & UART_STARTECH) {
            serial_outp(up, UART_LCR, 0xBF);
            serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
      }
      serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
      serial_outp(up, UART_DLL, quot & 0xff);         /* LS of divisor */
      serial_outp(up, UART_DLM, quot >> 8);           /* MS of divisor */
      if (up->port.type == PORT_16750)
            serial_outp(up, UART_FCR, fcr);           /* set fcr */
      serial_outp(up, UART_LCR, cval);          /* reset DLAB */
      up->lcr = cval;                           /* Save LCR */
      if (up->port.type != PORT_16750) {
            if (fcr & UART_FCR_ENABLE_FIFO) {
                  /* emulated UARTs (Lucent Venus 167x) need two steps */
                  serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
            }
            serial_outp(up, UART_FCR, fcr);           /* set fcr */
      }

      up->cflag = cflag;

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

static void
sunsu_set_termios(struct uart_port *port, struct ktermios *termios,
              struct ktermios *old)
{
      unsigned int baud, quot;

      /*
       * Ask the core to calculate the divisor for us.
       */
      baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
      quot = uart_get_divisor(port, baud);

      sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
}

static void sunsu_release_port(struct uart_port *port)
{
}

static int sunsu_request_port(struct uart_port *port)
{
      return 0;
}

static void sunsu_config_port(struct uart_port *port, int flags)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;

      if (flags & UART_CONFIG_TYPE) {
            /*
             * We are supposed to call autoconfig here, but this requires
             * splitting all the OBP probing crap from the UART probing.
             * We'll do it when we kill sunsu.c altogether.
             */
            port->type = up->type_probed; /* XXX */
      }
}

static int
sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
{
      return -EINVAL;
}

static const char *
sunsu_type(struct uart_port *port)
{
      int type = port->type;

      if (type >= ARRAY_SIZE(uart_config))
            type = 0;
      return uart_config[type].name;
}

static struct uart_ops sunsu_pops = {
      .tx_empty   = sunsu_tx_empty,
      .set_mctrl  = sunsu_set_mctrl,
      .get_mctrl  = sunsu_get_mctrl,
      .stop_tx    = sunsu_stop_tx,
      .start_tx   = sunsu_start_tx,
      .stop_rx    = sunsu_stop_rx,
      .enable_ms  = sunsu_enable_ms,
      .break_ctl  = sunsu_break_ctl,
      .startup    = sunsu_startup,
      .shutdown   = sunsu_shutdown,
      .set_termios      = sunsu_set_termios,
      .type       = sunsu_type,
      .release_port     = sunsu_release_port,
      .request_port     = sunsu_request_port,
      .config_port      = sunsu_config_port,
      .verify_port      = sunsu_verify_port,
};

#define UART_NR   4

static struct uart_sunsu_port sunsu_ports[UART_NR];

#ifdef CONFIG_SERIO

static DEFINE_SPINLOCK(sunsu_serio_lock);

static int sunsu_serio_write(struct serio *serio, unsigned char ch)
{
      struct uart_sunsu_port *up = serio->port_data;
      unsigned long flags;
      int lsr;

      spin_lock_irqsave(&sunsu_serio_lock, flags);

      do {
            lsr = serial_in(up, UART_LSR);
      } while (!(lsr & UART_LSR_THRE));

      /* Send the character out. */
      serial_out(up, UART_TX, ch);

      spin_unlock_irqrestore(&sunsu_serio_lock, flags);

      return 0;
}

static int sunsu_serio_open(struct serio *serio)
{
      struct uart_sunsu_port *up = serio->port_data;
      unsigned long flags;
      int ret;

      spin_lock_irqsave(&sunsu_serio_lock, flags);
      if (!up->serio_open) {
            up->serio_open = 1;
            ret = 0;
      } else
            ret = -EBUSY;
      spin_unlock_irqrestore(&sunsu_serio_lock, flags);

      return ret;
}

static void sunsu_serio_close(struct serio *serio)
{
      struct uart_sunsu_port *up = serio->port_data;
      unsigned long flags;

      spin_lock_irqsave(&sunsu_serio_lock, flags);
      up->serio_open = 0;
      spin_unlock_irqrestore(&sunsu_serio_lock, flags);
}

#endif /* CONFIG_SERIO */

static void sunsu_autoconfig(struct uart_sunsu_port *up)
{
      unsigned char status1, status2, scratch, scratch2, scratch3;
      unsigned char save_lcr, save_mcr;
      unsigned long flags;

      if (up->su_type == SU_PORT_NONE)
            return;

      up->type_probed = PORT_UNKNOWN;
      up->port.iotype = UPIO_MEM;

      spin_lock_irqsave(&up->port.lock, flags);

      if (!(up->port.flags & UPF_BUGGY_UART)) {
            /*
             * Do a simple existence test first; if we fail this, there's
             * no point trying anything else.
             *
             * 0x80 is used as a nonsense port to prevent against false
             * positives due to ISA bus float.  The assumption is that
             * 0x80 is a non-existent port; which should be safe since
             * include/asm/io.h also makes this assumption.
             */
            scratch = serial_inp(up, UART_IER);
            serial_outp(up, UART_IER, 0);
#ifdef __i386__
            outb(0xff, 0x080);
#endif
            scratch2 = serial_inp(up, UART_IER);
            serial_outp(up, UART_IER, 0x0f);
#ifdef __i386__
            outb(0, 0x080);
#endif
            scratch3 = serial_inp(up, UART_IER);
            serial_outp(up, UART_IER, scratch);
            if (scratch2 != 0 || scratch3 != 0x0F)
                  goto out;   /* We failed; there's nothing here */
      }

      save_mcr = serial_in(up, UART_MCR);
      save_lcr = serial_in(up, UART_LCR);

      /* 
       * Check to see if a UART is really there.  Certain broken
       * internal modems based on the Rockwell chipset fail this
       * test, because they apparently don't implement the loopback
       * test mode.  So this test is skipped on the COM 1 through
       * COM 4 ports.  This *should* be safe, since no board
       * manufacturer would be stupid enough to design a board
       * that conflicts with COM 1-4 --- we hope!
       */
      if (!(up->port.flags & UPF_SKIP_TEST)) {
            serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
            status1 = serial_inp(up, UART_MSR) & 0xF0;
            serial_outp(up, UART_MCR, save_mcr);
            if (status1 != 0x90)
                  goto out;   /* We failed loopback test */
      }
      serial_outp(up, UART_LCR, 0xBF);    /* set up for StarTech test */
      serial_outp(up, UART_EFR, 0);       /* EFR is the same as FCR */
      serial_outp(up, UART_LCR, 0);
      serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
      scratch = serial_in(up, UART_IIR) >> 6;
      switch (scratch) {
            case 0:
                  up->port.type = PORT_16450;
                  break;
            case 1:
                  up->port.type = PORT_UNKNOWN;
                  break;
            case 2:
                  up->port.type = PORT_16550;
                  break;
            case 3:
                  up->port.type = PORT_16550A;
                  break;
      }
      if (up->port.type == PORT_16550A) {
            /* Check for Startech UART's */
            serial_outp(up, UART_LCR, UART_LCR_DLAB);
            if (serial_in(up, UART_EFR) == 0) {
                  up->port.type = PORT_16650;
            } else {
                  serial_outp(up, UART_LCR, 0xBF);
                  if (serial_in(up, UART_EFR) == 0)
                        up->port.type = PORT_16650V2;
            }
      }
      if (up->port.type == PORT_16550A) {
            /* Check for TI 16750 */
            serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
            serial_outp(up, UART_FCR,
                      UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
            scratch = serial_in(up, UART_IIR) >> 5;
            if (scratch == 7) {
                  /*
                   * If this is a 16750, and not a cheap UART
                   * clone, then it should only go into 64 byte
                   * mode if the UART_FCR7_64BYTE bit was set
                   * while UART_LCR_DLAB was latched.
                   */
                  serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
                  serial_outp(up, UART_LCR, 0);
                  serial_outp(up, UART_FCR,
                            UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
                  scratch = serial_in(up, UART_IIR) >> 5;
                  if (scratch == 6)
                        up->port.type = PORT_16750;
            }
            serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
      }
      serial_outp(up, UART_LCR, save_lcr);
      if (up->port.type == PORT_16450) {
            scratch = serial_in(up, UART_SCR);
            serial_outp(up, UART_SCR, 0xa5);
            status1 = serial_in(up, UART_SCR);
            serial_outp(up, UART_SCR, 0x5a);
            status2 = serial_in(up, UART_SCR);
            serial_outp(up, UART_SCR, scratch);

            if ((status1 != 0xa5) || (status2 != 0x5a))
                  up->port.type = PORT_8250;
      }

      up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;

      if (up->port.type == PORT_UNKNOWN)
            goto out;
      up->type_probed = up->port.type;    /* XXX */

      /*
       * Reset the UART.
       */
#ifdef CONFIG_SERIAL_8250_RSA
      if (up->port.type == PORT_RSA)
            serial_outp(up, UART_RSA_FRR, 0);
#endif
      serial_outp(up, UART_MCR, save_mcr);
      serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
                             UART_FCR_CLEAR_RCVR |
                             UART_FCR_CLEAR_XMIT));
      serial_outp(up, UART_FCR, 0);
      (void)serial_in(up, UART_RX);
      serial_outp(up, UART_IER, 0);

out:
      spin_unlock_irqrestore(&up->port.lock, flags);
}

static struct uart_driver sunsu_reg = {
      .owner                  = THIS_MODULE,
      .driver_name            = "serial",
      .dev_name         = "ttyS",
      .major                  = TTY_MAJOR,
};

static int __init sunsu_kbd_ms_init(struct uart_sunsu_port *up)
{
      int quot, baud;
#ifdef CONFIG_SERIO
      struct serio *serio;
#endif

      if (up->su_type == SU_PORT_KBD) {
            up->cflag = B1200 | CS8 | CLOCAL | CREAD;
            baud = 1200;
      } else {
            up->cflag = B4800 | CS8 | CLOCAL | CREAD;
            baud = 4800;
      }
      quot = up->port.uartclk / (16 * baud);

      sunsu_autoconfig(up);
      if (up->port.type == PORT_UNKNOWN)
            return -ENODEV;

      printk("%s: %s port at %llx, irq %u\n",
             to_of_device(up->port.dev)->node->full_name,
             (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse",
             (unsigned long long) up->port.mapbase,
             up->port.irq);

#ifdef CONFIG_SERIO
      serio = &up->serio;
      serio->port_data = up;

      serio->id.type = SERIO_RS232;
      if (up->su_type == SU_PORT_KBD) {
            serio->id.proto = SERIO_SUNKBD;
            strlcpy(serio->name, "sukbd", sizeof(serio->name));
      } else {
            serio->id.proto = SERIO_SUN;
            serio->id.extra = 1;
            strlcpy(serio->name, "sums", sizeof(serio->name));
      }
      strlcpy(serio->phys,
            (!(up->port.line & 1) ? "su/serio0" : "su/serio1"),
            sizeof(serio->phys));

      serio->write = sunsu_serio_write;
      serio->open = sunsu_serio_open;
      serio->close = sunsu_serio_close;
      serio->dev.parent = up->port.dev;

      serio_register_port(serio);
#endif

      sunsu_change_speed(&up->port, up->cflag, 0, quot);

      sunsu_startup(&up->port);
      return 0;
}

/*
 * ------------------------------------------------------------
 * Serial console driver
 * ------------------------------------------------------------
 */

#ifdef CONFIG_SERIAL_SUNSU_CONSOLE

#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)

/*
 *    Wait for transmitter & holding register to empty
 */
static __inline__ void wait_for_xmitr(struct uart_sunsu_port *up)
{
      unsigned int status, tmout = 10000;

      /* Wait up to 10ms for the character(s) to be sent. */
      do {
            status = serial_in(up, UART_LSR);

            if (status & UART_LSR_BI)
                  up->lsr_break_flag = UART_LSR_BI;

            if (--tmout == 0)
                  break;
            udelay(1);
      } while ((status & BOTH_EMPTY) != BOTH_EMPTY);

      /* Wait up to 1s for flow control if necessary */
      if (up->port.flags & UPF_CONS_FLOW) {
            tmout = 1000000;
            while (--tmout &&
                   ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
                  udelay(1);
      }
}

static void sunsu_console_putchar(struct uart_port *port, int ch)
{
      struct uart_sunsu_port *up = (struct uart_sunsu_port *)port;

      wait_for_xmitr(up);
      serial_out(up, UART_TX, ch);
}

/*
 *    Print a string to the serial port trying not to disturb
 *    any possible real use of the port...
 */
static void sunsu_console_write(struct console *co, const char *s,
                        unsigned int count)
{
      struct uart_sunsu_port *up = &sunsu_ports[co->index];
      unsigned long flags;
      unsigned int ier;
      int locked = 1;

      local_irq_save(flags);
      if (up->port.sysrq) {
            locked = 0;
      } else if (oops_in_progress) {
            locked = spin_trylock(&up->port.lock);
      } else
            spin_lock(&up->port.lock);

      /*
       *    First save the UER then disable the interrupts
       */
      ier = serial_in(up, UART_IER);
      serial_out(up, UART_IER, 0);

      uart_console_write(&up->port, s, count, sunsu_console_putchar);

      /*
       *    Finally, wait for transmitter to become empty
       *    and restore the IER
       */
      wait_for_xmitr(up);
      serial_out(up, UART_IER, ier);

      if (locked)
            spin_unlock(&up->port.lock);
      local_irq_restore(flags);
}

/*
 *    Setup initial baud/bits/parity. We do two things here:
 *    - construct a cflag setting for the first su_open()
 *    - initialize the serial port
 *    Return non-zero if we didn't find a serial port.
 */
static int __init sunsu_console_setup(struct console *co, char *options)
{
      struct uart_port *port;
      int baud = 9600;
      int bits = 8;
      int parity = 'n';
      int flow = 'n';

      printk("Console: ttyS%d (SU)\n",
             (sunsu_reg.minor - 64) + co->index);

      /*
       * Check whether an invalid uart number has been specified, and
       * if so, search for the first available port that does have
       * console support.
       */
      if (co->index >= UART_NR)
            co->index = 0;
      port = &sunsu_ports[co->index].port;

      /*
       * Temporary fix.
       */
      spin_lock_init(&port->lock);

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

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

static struct console sunsu_console = {
      .name =     "ttyS",
      .write      =     sunsu_console_write,
      .device     =     uart_console_device,
      .setup      =     sunsu_console_setup,
      .flags      =     CON_PRINTBUFFER,
      .index      =     -1,
      .data =     &sunsu_reg,
};

/*
 *    Register console.
 */

static inline struct console *SUNSU_CONSOLE(void)
{
      return &sunsu_console;
}
#else
#define SUNSU_CONSOLE()             (NULL)
#define sunsu_serial_console_init() do { } while (0)
#endif

static enum su_type __devinit su_get_type(struct device_node *dp)
{
      struct device_node *ap = of_find_node_by_path("/aliases");

      if (ap) {
            const char *keyb = of_get_property(ap, "keyboard", NULL);
            const char *ms = of_get_property(ap, "mouse", NULL);

            if (keyb) {
                  if (dp == of_find_node_by_path(keyb))
                        return SU_PORT_KBD;
            }
            if (ms) {
                  if (dp == of_find_node_by_path(ms))
                        return SU_PORT_MS;
            }
      }

      return SU_PORT_PORT;
}

static int __devinit su_probe(struct of_device *op, const struct of_device_id *match)
{
      static int inst;
      struct device_node *dp = op->node;
      struct uart_sunsu_port *up;
      struct resource *rp;
      enum su_type type;
      int err;

      type = su_get_type(dp);
      if (type == SU_PORT_PORT) {
            if (inst >= UART_NR)
                  return -EINVAL;
            up = &sunsu_ports[inst];
      } else {
            up = kzalloc(sizeof(*up), GFP_KERNEL);
            if (!up)
                  return -ENOMEM;
      }

      up->port.line = inst;

      spin_lock_init(&up->port.lock);

      up->su_type = type;

      rp = &op->resource[0];
      up->port.mapbase = rp->start;
      up->reg_size = (rp->end - rp->start) + 1;
      up->port.membase = of_ioremap(rp, 0, up->reg_size, "su");
      if (!up->port.membase) {
            if (type != SU_PORT_PORT)
                  kfree(up);
            return -ENOMEM;
      }

      up->port.irq = op->irqs[0];

      up->port.dev = &op->dev;

      up->port.type = PORT_UNKNOWN;
      up->port.uartclk = (SU_BASE_BAUD * 16);

      err = 0;
      if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) {
            err = sunsu_kbd_ms_init(up);
            if (err) {
                  kfree(up);
                  goto out_unmap;
            }
            dev_set_drvdata(&op->dev, up);

            return 0;
      }

      up->port.flags |= UPF_BOOT_AUTOCONF;

      sunsu_autoconfig(up);

      err = -ENODEV;
      if (up->port.type == PORT_UNKNOWN)
            goto out_unmap;

      up->port.ops = &sunsu_pops;

      sunserial_console_match(SUNSU_CONSOLE(), dp,
                        &sunsu_reg, up->port.line);
      err = uart_add_one_port(&sunsu_reg, &up->port);
      if (err)
            goto out_unmap;

      dev_set_drvdata(&op->dev, up);

      inst++;

      return 0;

out_unmap:
      of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
      return err;
}

static int __devexit su_remove(struct of_device *op)
{
      struct uart_sunsu_port *up = dev_get_drvdata(&op->dev);

      if (up->su_type == SU_PORT_MS ||
          up->su_type == SU_PORT_KBD) {
#ifdef CONFIG_SERIO
            serio_unregister_port(&up->serio);
#endif
            kfree(up);
      } else if (up->port.type != PORT_UNKNOWN) {
            uart_remove_one_port(&sunsu_reg, &up->port);
      }

      if (up->port.membase)
            of_iounmap(&op->resource[0], up->port.membase, up->reg_size);

      dev_set_drvdata(&op->dev, NULL);

      return 0;
}

static struct of_device_id su_match[] = {
      {
            .name = "su",
      },
      {
            .name = "su_pnp",
      },
      {
            .name = "serial",
            .compatible = "su",
      },
      {},
};
MODULE_DEVICE_TABLE(of, su_match);

static struct of_platform_driver su_driver = {
      .name       = "su",
      .match_table      = su_match,
      .probe            = su_probe,
      .remove           = __devexit_p(su_remove),
};

static int __init sunsu_init(void)
{
      struct device_node *dp;
      int err;
      int num_uart = 0;

      for_each_node_by_name(dp, "su") {
            if (su_get_type(dp) == SU_PORT_PORT)
                  num_uart++;
      }
      for_each_node_by_name(dp, "su_pnp") {
            if (su_get_type(dp) == SU_PORT_PORT)
                  num_uart++;
      }
      for_each_node_by_name(dp, "serial") {
            if (of_device_is_compatible(dp, "su")) {
                  if (su_get_type(dp) == SU_PORT_PORT)
                        num_uart++;
            }
      }

      if (num_uart) {
            err = sunserial_register_minors(&sunsu_reg, num_uart);
            if (err)
                  return err;
      }

      err = of_register_driver(&su_driver, &of_bus_type);
      if (err && num_uart)
            sunserial_unregister_minors(&sunsu_reg, num_uart);

      return err;
}

static void __exit sunsu_exit(void)
{
      if (sunsu_reg.nr)
            sunserial_unregister_minors(&sunsu_reg, sunsu_reg.nr);
}

module_init(sunsu_init);
module_exit(sunsu_exit);

MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller");
MODULE_DESCRIPTION("Sun SU serial port driver");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");

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