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ioc3_serial.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2005 Silicon Graphics, Inc.  All Rights Reserved.
 */

/*
 * This file contains a module version of the ioc3 serial driver. This
 * includes all the support functions needed (support functions, etc.)
 * and the serial driver itself.
 */
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/circ_buf.h>
#include <linux/serial_reg.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/serial_core.h>
#include <linux/ioc3.h>

/*
 * Interesting things about the ioc3
 */

#define LOGICAL_PORTS         2     /* rs232(0) and rs422(1) */
#define PORTS_PER_CARD        2
#define LOGICAL_PORTS_PER_CARD (PORTS_PER_CARD * LOGICAL_PORTS)
#define MAX_CARDS       8
#define MAX_LOGICAL_PORTS     (LOGICAL_PORTS_PER_CARD * MAX_CARDS)

/* determine given the sio_ir what port it applies to */
#define GET_PORT_FROM_SIO_IR(_x)    (_x & SIO_IR_SA) ? 0 : 1


/*
 * we have 2 logical ports (rs232, rs422) for each physical port
 * evens are rs232, odds are rs422
 */
#define GET_PHYSICAL_PORT(_x) ((_x) >> 1)
#define GET_LOGICAL_PORT(_x)  ((_x) & 1)
#define IS_PHYSICAL_PORT(_x)  !((_x) & 1)
#define IS_RS232(_x)          !((_x) & 1)

static unsigned int Num_of_ioc3_cards;
static unsigned int Submodule_slot;

/* defining this will get you LOTS of great debug info */
//#define DEBUG_INTERRUPTS
#define DPRINT_CONFIG(_x...)  ;
//#define DPRINT_CONFIG(_x...)  printk _x
#define NOT_PROGRESS()  ;
//#define NOT_PROGRESS()      printk("%s : fails %d\n", __FUNCTION__, __LINE__)

/* number of characters we want to transmit to the lower level at a time */
#define MAX_CHARS       256
#define FIFO_SIZE       (MAX_CHARS-1)     /* it's a uchar */

/* Device name we're using */
#define DEVICE_NAME           "ttySIOC"
#define DEVICE_MAJOR          204
#define DEVICE_MINOR          116

/* flags for next_char_state */
#define NCS_BREAK       0x1
#define NCS_PARITY            0x2
#define NCS_FRAMING           0x4
#define NCS_OVERRUN           0x8

/* cause we need SOME parameters ... */
#define MIN_BAUD_SUPPORTED    1200
#define MAX_BAUD_SUPPORTED    115200

/* protocol types supported */
#define PROTO_RS232           0
#define PROTO_RS422           1

/* Notification types */
#define N_DATA_READY          0x01
#define N_OUTPUT_LOWAT        0x02
#define N_BREAK               0x04
#define N_PARITY_ERROR        0x08
#define N_FRAMING_ERROR       0x10
#define N_OVERRUN_ERROR       0x20
#define N_DDCD                0x40
#define N_DCTS                0x80

#define N_ALL_INPUT           (N_DATA_READY | N_BREAK                \
                              | N_PARITY_ERROR | N_FRAMING_ERROR \
                              | N_OVERRUN_ERROR | N_DDCD | N_DCTS)

#define N_ALL_OUTPUT          N_OUTPUT_LOWAT

#define N_ALL_ERRORS          (N_PARITY_ERROR | N_FRAMING_ERROR \
                                    | N_OVERRUN_ERROR)

#define N_ALL                 (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK    \
                              | N_PARITY_ERROR | N_FRAMING_ERROR  \
                              | N_OVERRUN_ERROR | N_DDCD | N_DCTS)

#define SER_CLK_SPEED(prediv) ((22000000 << 1) / prediv)
#define SER_DIVISOR(x, clk)   (((clk) + (x) * 8) / ((x) * 16))
#define DIVISOR_TO_BAUD(div, clk) ((clk) / 16 / (div))

/* Some masks */
#define LCR_MASK_BITS_CHAR    (UART_LCR_WLEN5 | UART_LCR_WLEN6 \
                              | UART_LCR_WLEN7 | UART_LCR_WLEN8)
#define LCR_MASK_STOP_BITS    (UART_LCR_STOP)

#define PENDING(_a, _p)       (readl(&(_p)->vma->sio_ir) & (_a)->ic_enable)

#define RING_BUF_SIZE         4096
#define BUF_SIZE_BIT          SBBR_L_SIZE
#define PROD_CONS_MASK        PROD_CONS_PTR_4K

#define TOTAL_RING_BUF_SIZE   (RING_BUF_SIZE * 4)

/* driver specific - one per card */
struct ioc3_card {
      struct {
            /* uart ports are allocated here */
            struct uart_port icp_uart_port[LOGICAL_PORTS];
            /* the ioc3_port used for this port */
            struct ioc3_port *icp_port;
      } ic_port[PORTS_PER_CARD];
      /* currently enabled interrupts */
      uint32_t ic_enable;
};

/* Local port info for each IOC3 serial port */
struct ioc3_port {
      /* handy reference material */
      struct uart_port *ip_port;
      struct ioc3_card *ip_card;
      struct ioc3_driver_data *ip_idd;
      struct ioc3_submodule *ip_is;

      /* pci mem addresses for this port */
      struct ioc3_serialregs __iomem *ip_serial_regs;
      struct ioc3_uartregs __iomem *ip_uart_regs;

      /* Ring buffer page for this port */
      dma_addr_t ip_dma_ringbuf;
      /* vaddr of ring buffer */
      struct ring_buffer *ip_cpu_ringbuf;

      /* Rings for this port */
      struct ring *ip_inring;
      struct ring *ip_outring;

      /* Hook to port specific values */
      struct port_hooks *ip_hooks;

      spinlock_t ip_lock;

      /* Various rx/tx parameters */
      int ip_baud;
      int ip_tx_lowat;
      int ip_rx_timeout;

      /* Copy of notification bits */
      int ip_notify;

      /* Shadow copies of various registers so we don't need to PIO
       * read them constantly
       */
      uint32_t ip_sscr;
      uint32_t ip_tx_prod;
      uint32_t ip_rx_cons;
      unsigned char ip_flags;
};

/* tx low water mark.  We need to notify the driver whenever tx is getting
 * close to empty so it can refill the tx buffer and keep things going.
 * Let's assume that if we interrupt 1 ms before the tx goes idle, we'll
 * have no trouble getting in more chars in time (I certainly hope so).
 */
#define TX_LOWAT_LATENCY      1000
#define TX_LOWAT_HZ          (1000000 / TX_LOWAT_LATENCY)
#define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ)

/* Flags per port */
#define INPUT_HIGH            0x01
      /* used to signify that we have turned off the rx_high
       * temporarily - we need to drain the fifo and don't
       * want to get blasted with interrupts.
       */
#define DCD_ON                0x02
      /* DCD state is on */
#define LOWAT_WRITTEN         0x04
#define READ_ABORTED          0x08
      /* the read was aborted - used to avaoid infinate looping
       * in the interrupt handler
       */
#define INPUT_ENABLE          0x10

/* Since each port has different register offsets and bitmasks
 * for everything, we'll store those that we need in tables so we
 * don't have to be constantly checking the port we are dealing with.
 */
struct port_hooks {
      uint32_t intr_delta_dcd;
      uint32_t intr_delta_cts;
      uint32_t intr_tx_mt;
      uint32_t intr_rx_timer;
      uint32_t intr_rx_high;
      uint32_t intr_tx_explicit;
      uint32_t intr_clear;
      uint32_t intr_all;
      char rs422_select_pin;
};

static struct port_hooks hooks_array[PORTS_PER_CARD] = {
      /* values for port A */
      {
      .intr_delta_dcd = SIO_IR_SA_DELTA_DCD,
      .intr_delta_cts = SIO_IR_SA_DELTA_CTS,
      .intr_tx_mt = SIO_IR_SA_TX_MT,
      .intr_rx_timer = SIO_IR_SA_RX_TIMER,
      .intr_rx_high = SIO_IR_SA_RX_HIGH,
      .intr_tx_explicit = SIO_IR_SA_TX_EXPLICIT,
      .intr_clear = (SIO_IR_SA_TX_MT | SIO_IR_SA_RX_FULL
                        | SIO_IR_SA_RX_HIGH
                        | SIO_IR_SA_RX_TIMER
                        | SIO_IR_SA_DELTA_DCD
                        | SIO_IR_SA_DELTA_CTS
                        | SIO_IR_SA_INT
                        | SIO_IR_SA_TX_EXPLICIT
                        | SIO_IR_SA_MEMERR),
      .intr_all =  SIO_IR_SA,
      .rs422_select_pin = GPPR_UARTA_MODESEL_PIN,
       },

      /* values for port B */
      {
      .intr_delta_dcd = SIO_IR_SB_DELTA_DCD,
      .intr_delta_cts = SIO_IR_SB_DELTA_CTS,
      .intr_tx_mt = SIO_IR_SB_TX_MT,
      .intr_rx_timer = SIO_IR_SB_RX_TIMER,
      .intr_rx_high = SIO_IR_SB_RX_HIGH,
      .intr_tx_explicit = SIO_IR_SB_TX_EXPLICIT,
      .intr_clear = (SIO_IR_SB_TX_MT | SIO_IR_SB_RX_FULL
                        | SIO_IR_SB_RX_HIGH
                        | SIO_IR_SB_RX_TIMER
                        | SIO_IR_SB_DELTA_DCD
                        | SIO_IR_SB_DELTA_CTS
                        | SIO_IR_SB_INT
                        | SIO_IR_SB_TX_EXPLICIT
                        | SIO_IR_SB_MEMERR),
      .intr_all = SIO_IR_SB,
      .rs422_select_pin = GPPR_UARTB_MODESEL_PIN,
       }
};

struct ring_entry {
      union {
            struct {
                  uint32_t alldata;
                  uint32_t allsc;
            } all;
            struct {
                  char data[4];     /* data bytes */
                  char sc[4]; /* status/control */
            } s;
      } u;
};

/* Test the valid bits in any of the 4 sc chars using "allsc" member */
#define RING_ANY_VALID \
      ((uint32_t)(RXSB_MODEM_VALID | RXSB_DATA_VALID) * 0x01010101)

#define ring_sc         u.s.sc
#define ring_data u.s.data
#define ring_allsc      u.all.allsc

/* Number of entries per ring buffer. */
#define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry))

/* An individual ring */
struct ring {
      struct ring_entry entries[ENTRIES_PER_RING];
};

/* The whole enchilada */
struct ring_buffer {
      struct ring TX_A;
      struct ring RX_A;
      struct ring TX_B;
      struct ring RX_B;
};

/* Get a ring from a port struct */
#define RING(_p, _wh)   &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh)

/* for Infinite loop detection  */
#define MAXITER         10000000


/**
 * set_baud - Baud rate setting code
 * @port: port to set
 * @baud: baud rate to use
 */
static int set_baud(struct ioc3_port *port, int baud)
{
      int divisor;
      int actual_baud;
      int diff;
      int lcr, prediv;
      struct ioc3_uartregs __iomem *uart;

      for (prediv = 6; prediv < 64; prediv++) {
            divisor = SER_DIVISOR(baud, SER_CLK_SPEED(prediv));
            if (!divisor)
                  continue;   /* invalid divisor */
            actual_baud = DIVISOR_TO_BAUD(divisor, SER_CLK_SPEED(prediv));

            diff = actual_baud - baud;
            if (diff < 0)
                  diff = -diff;

            /* if we're within 1% we've found a match */
            if (diff * 100 <= actual_baud)
                  break;
      }

      /* if the above loop completed, we didn't match
       * the baud rate.  give up.
       */
      if (prediv == 64) {
            NOT_PROGRESS();
            return 1;
      }

      uart = port->ip_uart_regs;
      lcr = readb(&uart->iu_lcr);

      writeb(lcr | UART_LCR_DLAB, &uart->iu_lcr);
      writeb((unsigned char)divisor, &uart->iu_dll);
      writeb((unsigned char)(divisor >> 8), &uart->iu_dlm);
      writeb((unsigned char)prediv, &uart->iu_scr);
      writeb((unsigned char)lcr, &uart->iu_lcr);

      return 0;
}

/**
 * get_ioc3_port - given a uart port, return the control structure
 * @the_port: uart port to find
 */
static struct ioc3_port *get_ioc3_port(struct uart_port *the_port)
{
      struct ioc3_driver_data *idd = dev_get_drvdata(the_port->dev);
      struct ioc3_card *card_ptr = idd->data[Submodule_slot];
      int ii, jj;

      if (!card_ptr) {
            NOT_PROGRESS();
            return NULL;
      }
      for (ii = 0; ii < PORTS_PER_CARD; ii++) {
            for (jj = 0; jj < LOGICAL_PORTS; jj++) {
                  if (the_port == &card_ptr->ic_port[ii].icp_uart_port[jj])
                        return card_ptr->ic_port[ii].icp_port;
            }
      }
      NOT_PROGRESS();
      return NULL;
}

/**
 * port_init - Initialize the sio and ioc3 hardware for a given port
 *                called per port from attach...
 * @port: port to initialize
 */
static int inline port_init(struct ioc3_port *port)
{
      uint32_t sio_cr;
      struct port_hooks *hooks = port->ip_hooks;
      struct ioc3_uartregs __iomem *uart;
      int reset_loop_counter = 0xfffff;
      struct ioc3_driver_data *idd = port->ip_idd;

      /* Idle the IOC3 serial interface */
      writel(SSCR_RESET, &port->ip_serial_regs->sscr);

      /* Wait until any pending bus activity for this port has ceased */
      do {
            sio_cr = readl(&idd->vma->sio_cr);
            if (reset_loop_counter-- <= 0) {
                  printk(KERN_WARNING
                         "IOC3 unable to come out of reset"
                        " scr 0x%x\n", sio_cr);
                  return -1;
            }
      } while (!(sio_cr & SIO_CR_ARB_DIAG_IDLE) &&
             (((sio_cr &= SIO_CR_ARB_DIAG) == SIO_CR_ARB_DIAG_TXA)
            || sio_cr == SIO_CR_ARB_DIAG_TXB
            || sio_cr == SIO_CR_ARB_DIAG_RXA
            || sio_cr == SIO_CR_ARB_DIAG_RXB));

      /* Finish reset sequence */
      writel(0, &port->ip_serial_regs->sscr);

      /* Once RESET is done, reload cached tx_prod and rx_cons values
       * and set rings to empty by making prod == cons
       */
      port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
      writel(port->ip_tx_prod, &port->ip_serial_regs->stpir);
      port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
      writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir);

      /* Disable interrupts for this 16550 */
      uart = port->ip_uart_regs;
      writeb(0, &uart->iu_lcr);
      writeb(0, &uart->iu_ier);

      /* Set the default baud */
      set_baud(port, port->ip_baud);

      /* Set line control to 8 bits no parity */
      writeb(UART_LCR_WLEN8 | 0, &uart->iu_lcr);
      /* UART_LCR_STOP == 1 stop */

      /* Enable the FIFOs */
      writeb(UART_FCR_ENABLE_FIFO, &uart->iu_fcr);
      /* then reset 16550 FIFOs */
      writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
             &uart->iu_fcr);

      /* Clear modem control register */
      writeb(0, &uart->iu_mcr);

      /* Clear deltas in modem status register */
      writel(0, &port->ip_serial_regs->shadow);

      /* Only do this once per port pair */
      if (port->ip_hooks == &hooks_array[0]) {
            unsigned long ring_pci_addr;
            uint32_t __iomem *sbbr_l, *sbbr_h;

            sbbr_l = &idd->vma->sbbr_l;
            sbbr_h = &idd->vma->sbbr_h;
            ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf;
            DPRINT_CONFIG(("%s: ring_pci_addr 0x%p\n",
                         __FUNCTION__, (void *)ring_pci_addr));

            writel((unsigned int)((uint64_t) ring_pci_addr >> 32), sbbr_h);
            writel((unsigned int)ring_pci_addr | BUF_SIZE_BIT, sbbr_l);
      }

      /* Set the receive timeout value to 10 msec */
      writel(SRTR_HZ / 100, &port->ip_serial_regs->srtr);

      /* Set rx threshold, enable DMA */
      /* Set high water mark at 3/4 of full ring */
      port->ip_sscr = (ENTRIES_PER_RING * 3 / 4);

      /* uart experiences pauses at high baud rate reducing actual
       * throughput by 10% or so unless we enable high speed polling
       * XXX when this hardware bug is resolved we should revert to
       * normal polling speed
       */
      port->ip_sscr |= SSCR_HIGH_SPD;

      writel(port->ip_sscr, &port->ip_serial_regs->sscr);

      /* Disable and clear all serial related interrupt bits */
      port->ip_card->ic_enable &= ~hooks->intr_clear;
      ioc3_disable(port->ip_is, idd, hooks->intr_clear);
      ioc3_ack(port->ip_is, idd, hooks->intr_clear);
      return 0;
}

/**
 * enable_intrs - enable interrupts
 * @port: port to enable
 * @mask: mask to use
 */
static void enable_intrs(struct ioc3_port *port, uint32_t mask)
{
      if ((port->ip_card->ic_enable & mask) != mask) {
            port->ip_card->ic_enable |= mask;
            ioc3_enable(port->ip_is, port->ip_idd, mask);
      }
}

/**
 * local_open - local open a port
 * @port: port to open
 */
static inline int local_open(struct ioc3_port *port)
{
      int spiniter = 0;

      port->ip_flags = INPUT_ENABLE;

      /* Pause the DMA interface if necessary */
      if (port->ip_sscr & SSCR_DMA_EN) {
            writel(port->ip_sscr | SSCR_DMA_PAUSE,
                   &port->ip_serial_regs->sscr);
            while ((readl(&port->ip_serial_regs->sscr)
                  & SSCR_PAUSE_STATE) == 0) {
                  spiniter++;
                  if (spiniter > MAXITER) {
                        NOT_PROGRESS();
                        return -1;
                  }
            }
      }

      /* Reset the input fifo.  If the uart received chars while the port
       * was closed and DMA is not enabled, the uart may have a bunch of
       * chars hanging around in its rx fifo which will not be discarded
       * by rclr in the upper layer. We must get rid of them here.
       */
      writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR,
             &port->ip_uart_regs->iu_fcr);

      writeb(UART_LCR_WLEN8, &port->ip_uart_regs->iu_lcr);
      /* UART_LCR_STOP == 1 stop */

      /* Re-enable DMA, set default threshold to intr whenever there is
       * data available.
       */
      port->ip_sscr &= ~SSCR_RX_THRESHOLD;
      port->ip_sscr |= 1;     /* default threshold */

      /* Plug in the new sscr.  This implicitly clears the DMA_PAUSE
       * flag if it was set above
       */
      writel(port->ip_sscr, &port->ip_serial_regs->sscr);
      port->ip_tx_lowat = 1;
      return 0;
}

/**
 * set_rx_timeout - Set rx timeout and threshold values.
 * @port: port to use
 * @timeout: timeout value in ticks
 */
static inline int set_rx_timeout(struct ioc3_port *port, int timeout)
{
      int threshold;

      port->ip_rx_timeout = timeout;

      /* Timeout is in ticks.  Let's figure out how many chars we
       * can receive at the current baud rate in that interval
       * and set the rx threshold to that amount.  There are 4 chars
       * per ring entry, so we'll divide the number of chars that will
       * arrive in timeout by 4.
       * So .... timeout * baud / 10 / HZ / 4, with HZ = 100.
       */
      threshold = timeout * port->ip_baud / 4000;
      if (threshold == 0)
            threshold = 1;    /* otherwise we'll intr all the time! */

      if ((unsigned)threshold > (unsigned)SSCR_RX_THRESHOLD)
            return 1;

      port->ip_sscr &= ~SSCR_RX_THRESHOLD;
      port->ip_sscr |= threshold;
      writel(port->ip_sscr, &port->ip_serial_regs->sscr);

      /* Now set the rx timeout to the given value
       * again timeout * SRTR_HZ / HZ
       */
      timeout = timeout * SRTR_HZ / 100;
      if (timeout > SRTR_CNT)
            timeout = SRTR_CNT;
      writel(timeout, &port->ip_serial_regs->srtr);
      return 0;
}

/**
 * config_port - config the hardware
 * @port: port to config
 * @baud: baud rate for the port
 * @byte_size: data size
 * @stop_bits: number of stop bits
 * @parenb: parity enable ?
 * @parodd: odd parity ?
 */
static inline int
config_port(struct ioc3_port *port,
          int baud, int byte_size, int stop_bits, int parenb, int parodd)
{
      char lcr, sizebits;
      int spiniter = 0;

      DPRINT_CONFIG(("%s: line %d baud %d byte_size %d stop %d parenb %d "
                  "parodd %d\n",
                   __FUNCTION__, ((struct uart_port *)port->ip_port)->line,
                  baud, byte_size, stop_bits, parenb, parodd));

      if (set_baud(port, baud))
            return 1;

      switch (byte_size) {
      case 5:
            sizebits = UART_LCR_WLEN5;
            break;
      case 6:
            sizebits = UART_LCR_WLEN6;
            break;
      case 7:
            sizebits = UART_LCR_WLEN7;
            break;
      case 8:
            sizebits = UART_LCR_WLEN8;
            break;
      default:
            return 1;
      }

      /* Pause the DMA interface if necessary */
      if (port->ip_sscr & SSCR_DMA_EN) {
            writel(port->ip_sscr | SSCR_DMA_PAUSE,
                   &port->ip_serial_regs->sscr);
            while ((readl(&port->ip_serial_regs->sscr)
                  & SSCR_PAUSE_STATE) == 0) {
                  spiniter++;
                  if (spiniter > MAXITER)
                        return -1;
            }
      }

      /* Clear relevant fields in lcr */
      lcr = readb(&port->ip_uart_regs->iu_lcr);
      lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR |
             UART_LCR_PARITY | LCR_MASK_STOP_BITS);

      /* Set byte size in lcr */
      lcr |= sizebits;

      /* Set parity */
      if (parenb) {
            lcr |= UART_LCR_PARITY;
            if (!parodd)
                  lcr |= UART_LCR_EPAR;
      }

      /* Set stop bits */
      if (stop_bits)
            lcr |= UART_LCR_STOP /* 2 stop bits */ ;

      writeb(lcr, &port->ip_uart_regs->iu_lcr);

      /* Re-enable the DMA interface if necessary */
      if (port->ip_sscr & SSCR_DMA_EN) {
            writel(port->ip_sscr, &port->ip_serial_regs->sscr);
      }
      port->ip_baud = baud;

      /* When we get within this number of ring entries of filling the
       * entire ring on tx, place an EXPLICIT intr to generate a lowat
       * notification when output has drained.
       */
      port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4;
      if (port->ip_tx_lowat == 0)
            port->ip_tx_lowat = 1;

      set_rx_timeout(port, 2);
      return 0;
}

/**
 * do_write - Write bytes to the port.  Returns the number of bytes
 *                actually written. Called from transmit_chars
 * @port: port to use
 * @buf: the stuff to write
 * @len: how many bytes in 'buf'
 */
static inline int do_write(struct ioc3_port *port, char *buf, int len)
{
      int prod_ptr, cons_ptr, total = 0;
      struct ring *outring;
      struct ring_entry *entry;
      struct port_hooks *hooks = port->ip_hooks;

      BUG_ON(!(len >= 0));

      prod_ptr = port->ip_tx_prod;
      cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
      outring = port->ip_outring;

      /* Maintain a 1-entry red-zone.  The ring buffer is full when
       * (cons - prod) % ring_size is 1.  Rather than do this subtraction
       * in the body of the loop, I'll do it now.
       */
      cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK;

      /* Stuff the bytes into the output */
      while ((prod_ptr != cons_ptr) && (len > 0)) {
            int xx;

            /* Get 4 bytes (one ring entry) at a time */
            entry = (struct ring_entry *)((caddr_t) outring + prod_ptr);

            /* Invalidate all entries */
            entry->ring_allsc = 0;

            /* Copy in some bytes */
            for (xx = 0; (xx < 4) && (len > 0); xx++) {
                  entry->ring_data[xx] = *buf++;
                  entry->ring_sc[xx] = TXCB_VALID;
                  len--;
                  total++;
            }

            /* If we are within some small threshold of filling up the
             * entire ring buffer, we must place an EXPLICIT intr here
             * to generate a lowat interrupt in case we subsequently
             * really do fill up the ring and the caller goes to sleep.
             * No need to place more than one though.
             */
            if (!(port->ip_flags & LOWAT_WRITTEN) &&
                ((cons_ptr - prod_ptr) & PROD_CONS_MASK)
                <= port->ip_tx_lowat * (int)sizeof(struct ring_entry)) {
                  port->ip_flags |= LOWAT_WRITTEN;
                  entry->ring_sc[0] |= TXCB_INT_WHEN_DONE;
            }

            /* Go on to next entry */
            prod_ptr += sizeof(struct ring_entry);
            prod_ptr &= PROD_CONS_MASK;
      }

      /* If we sent something, start DMA if necessary */
      if (total > 0 && !(port->ip_sscr & SSCR_DMA_EN)) {
            port->ip_sscr |= SSCR_DMA_EN;
            writel(port->ip_sscr, &port->ip_serial_regs->sscr);
      }

      /* Store the new producer pointer.  If tx is disabled, we stuff the
       * data into the ring buffer, but we don't actually start tx.
       */
      if (!uart_tx_stopped(port->ip_port)) {
            writel(prod_ptr, &port->ip_serial_regs->stpir);

            /* If we are now transmitting, enable tx_mt interrupt so we
             * can disable DMA if necessary when the tx finishes.
             */
            if (total > 0)
                  enable_intrs(port, hooks->intr_tx_mt);
      }
      port->ip_tx_prod = prod_ptr;

      return total;
}

/**
 * disable_intrs - disable interrupts
 * @port: port to enable
 * @mask: mask to use
 */
static inline void disable_intrs(struct ioc3_port *port, uint32_t mask)
{
      if (port->ip_card->ic_enable & mask) {
            ioc3_disable(port->ip_is, port->ip_idd, mask);
            port->ip_card->ic_enable &= ~mask;
      }
}

/**
 * set_notification - Modify event notification
 * @port: port to use
 * @mask: events mask
 * @set_on: set ?
 */
static int set_notification(struct ioc3_port *port, int mask, int set_on)
{
      struct port_hooks *hooks = port->ip_hooks;
      uint32_t intrbits, sscrbits;

      BUG_ON(!mask);

      intrbits = sscrbits = 0;

      if (mask & N_DATA_READY)
            intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high);
      if (mask & N_OUTPUT_LOWAT)
            intrbits |= hooks->intr_tx_explicit;
      if (mask & N_DDCD) {
            intrbits |= hooks->intr_delta_dcd;
            sscrbits |= SSCR_RX_RING_DCD;
      }
      if (mask & N_DCTS)
            intrbits |= hooks->intr_delta_cts;

      if (set_on) {
            enable_intrs(port, intrbits);
            port->ip_notify |= mask;
            port->ip_sscr |= sscrbits;
      } else {
            disable_intrs(port, intrbits);
            port->ip_notify &= ~mask;
            port->ip_sscr &= ~sscrbits;
      }

      /* We require DMA if either DATA_READY or DDCD notification is
       * currently requested. If neither of these is requested and
       * there is currently no tx in progress, DMA may be disabled.
       */
      if (port->ip_notify & (N_DATA_READY | N_DDCD))
            port->ip_sscr |= SSCR_DMA_EN;
      else if (!(port->ip_card->ic_enable & hooks->intr_tx_mt))
            port->ip_sscr &= ~SSCR_DMA_EN;

      writel(port->ip_sscr, &port->ip_serial_regs->sscr);
      return 0;
}

/**
 * set_mcr - set the master control reg
 * @the_port: port to use
 * @mask1: mcr mask
 * @mask2: shadow mask
 */
static inline int set_mcr(struct uart_port *the_port,
                    int mask1, int mask2)
{
      struct ioc3_port *port = get_ioc3_port(the_port);
      uint32_t shadow;
      int spiniter = 0;
      char mcr;

      if (!port)
            return -1;

      /* Pause the DMA interface if necessary */
      if (port->ip_sscr & SSCR_DMA_EN) {
            writel(port->ip_sscr | SSCR_DMA_PAUSE,
                   &port->ip_serial_regs->sscr);
            while ((readl(&port->ip_serial_regs->sscr)
                  & SSCR_PAUSE_STATE) == 0) {
                  spiniter++;
                  if (spiniter > MAXITER)
                        return -1;
            }
      }
      shadow = readl(&port->ip_serial_regs->shadow);
      mcr = (shadow & 0xff000000) >> 24;

      /* Set new value */
      mcr |= mask1;
      shadow |= mask2;
      writeb(mcr, &port->ip_uart_regs->iu_mcr);
      writel(shadow, &port->ip_serial_regs->shadow);

      /* Re-enable the DMA interface if necessary */
      if (port->ip_sscr & SSCR_DMA_EN) {
            writel(port->ip_sscr, &port->ip_serial_regs->sscr);
      }
      return 0;
}

/**
 * ioc3_set_proto - set the protocol for the port
 * @port: port to use
 * @proto: protocol to use
 */
static int ioc3_set_proto(struct ioc3_port *port, int proto)
{
      struct port_hooks *hooks = port->ip_hooks;

      switch (proto) {
      default:
      case PROTO_RS232:
            /* Clear the appropriate GIO pin */
            DPRINT_CONFIG(("%s: rs232\n", __FUNCTION__));
            writel(0, (&port->ip_idd->vma->gppr[0]
                              + hooks->rs422_select_pin));
            break;

      case PROTO_RS422:
            /* Set the appropriate GIO pin */
            DPRINT_CONFIG(("%s: rs422\n", __FUNCTION__));
            writel(1, (&port->ip_idd->vma->gppr[0]
                              + hooks->rs422_select_pin));
            break;
      }
      return 0;
}

/**
 * transmit_chars - upper level write, called with the_port->lock
 * @the_port: port to write
 */
static void transmit_chars(struct uart_port *the_port)
{
      int xmit_count, tail, head;
      int result;
      char *start;
      struct tty_struct *tty;
      struct ioc3_port *port = get_ioc3_port(the_port);
      struct uart_info *info;

      if (!the_port)
            return;
      if (!port)
            return;

      info = the_port->info;
      tty = info->tty;

      if (uart_circ_empty(&info->xmit) || uart_tx_stopped(the_port)) {
            /* Nothing to do or hw stopped */
            set_notification(port, N_ALL_OUTPUT, 0);
            return;
      }

      head = info->xmit.head;
      tail = info->xmit.tail;
      start = (char *)&info->xmit.buf[tail];

      /* write out all the data or until the end of the buffer */
      xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail);
      if (xmit_count > 0) {
            result = do_write(port, start, xmit_count);
            if (result > 0) {
                  /* booking */
                  xmit_count -= result;
                  the_port->icount.tx += result;
                  /* advance the pointers */
                  tail += result;
                  tail &= UART_XMIT_SIZE - 1;
                  info->xmit.tail = tail;
                  start = (char *)&info->xmit.buf[tail];
            }
      }
      if (uart_circ_chars_pending(&info->xmit) < WAKEUP_CHARS)
            uart_write_wakeup(the_port);

      if (uart_circ_empty(&info->xmit)) {
            set_notification(port, N_OUTPUT_LOWAT, 0);
      } else {
            set_notification(port, N_OUTPUT_LOWAT, 1);
      }
}

/**
 * ioc3_change_speed - change the speed of the port
 * @the_port: port to change
 * @new_termios: new termios settings
 * @old_termios: old termios settings
 */
static void
ioc3_change_speed(struct uart_port *the_port,
              struct termios *new_termios, struct termios *old_termios)
{
      struct ioc3_port *port = get_ioc3_port(the_port);
      unsigned int cflag;
      int baud;
      int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
      struct uart_info *info = the_port->info;

      cflag = new_termios->c_cflag;

      switch (cflag & CSIZE) {
      case CS5:
            new_data = 5;
            break;
      case CS6:
            new_data = 6;
            break;
      case CS7:
            new_data = 7;
            break;
      case CS8:
            new_data = 8;
            break;
      default:
            /* cuz we always need a default ... */
            new_data = 5;
            break;
      }
      if (cflag & CSTOPB) {
            new_stop = 1;
      }
      if (cflag & PARENB) {
            new_parity_enable = 1;
            if (cflag & PARODD)
                  new_parity = 1;
      }
      baud = uart_get_baud_rate(the_port, new_termios, old_termios,
                          MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED);
      DPRINT_CONFIG(("%s: returned baud %d for line %d\n", __FUNCTION__, baud,
                        the_port->line));

      if (!the_port->fifosize)
            the_port->fifosize = FIFO_SIZE;
      uart_update_timeout(the_port, cflag, baud);

      the_port->ignore_status_mask = N_ALL_INPUT;

      info->tty->low_latency = 1;

      if (I_IGNPAR(info->tty))
            the_port->ignore_status_mask &= ~(N_PARITY_ERROR
                                      | N_FRAMING_ERROR);
      if (I_IGNBRK(info->tty)) {
            the_port->ignore_status_mask &= ~N_BREAK;
            if (I_IGNPAR(info->tty))
                  the_port->ignore_status_mask &= ~N_OVERRUN_ERROR;
      }
      if (!(cflag & CREAD)) {
            /* ignore everything */
            the_port->ignore_status_mask &= ~N_DATA_READY;
      }

      if (cflag & CRTSCTS) {
            /* enable hardware flow control */
            port->ip_sscr |= SSCR_HFC_EN;
      }
      else {
            /* disable hardware flow control */
            port->ip_sscr &= ~SSCR_HFC_EN;
      }
      writel(port->ip_sscr, &port->ip_serial_regs->sscr);

      /* Set the configuration and proper notification call */
      DPRINT_CONFIG(("%s : port 0x%p line %d cflag 0%o "
                   "config_port(baud %d data %d stop %d penable %d "
                  " parity %d), notification 0x%x\n",
                   __FUNCTION__, (void *)port, the_port->line, cflag, baud,
                   new_data, new_stop, new_parity_enable, new_parity,
                   the_port->ignore_status_mask));

      if ((config_port(port, baud,  /* baud */
                   new_data,  /* byte size */
                   new_stop,  /* stop bits */
                   new_parity_enable,     /* set parity */
                   new_parity)) >= 0) {   /* parity 1==odd */
            set_notification(port, the_port->ignore_status_mask, 1);
      }
}

/**
 * ic3_startup_local - Start up the serial port - returns >= 0 if no errors
 * @the_port: Port to operate on
 */
static inline int ic3_startup_local(struct uart_port *the_port)
{
      struct ioc3_port *port;

      if (!the_port) {
            NOT_PROGRESS();
            return -1;
      }

      port = get_ioc3_port(the_port);
      if (!port) {
            NOT_PROGRESS();
            return -1;
      }

      local_open(port);

      /* set the protocol */
      ioc3_set_proto(port, IS_RS232(the_port->line) ? PROTO_RS232 :
                                          PROTO_RS422);
      return 0;
}

/*
 * ioc3_cb_output_lowat - called when the output low water mark is hit
 * @port: port to output
 */
static void ioc3_cb_output_lowat(struct ioc3_port *port)
{
      unsigned long pflags;

      /* the_port->lock is set on the call here */
      if (port->ip_port) {
            spin_lock_irqsave(&port->ip_port->lock, pflags);
            transmit_chars(port->ip_port);
            spin_unlock_irqrestore(&port->ip_port->lock, pflags);
      }
}

/*
 * ioc3_cb_post_ncs - called for some basic errors
 * @port: port to use
 * @ncs: event
 */
static void ioc3_cb_post_ncs(struct uart_port *the_port, int ncs)
{
      struct uart_icount *icount;

      icount = &the_port->icount;

      if (ncs & NCS_BREAK)
            icount->brk++;
      if (ncs & NCS_FRAMING)
            icount->frame++;
      if (ncs & NCS_OVERRUN)
            icount->overrun++;
      if (ncs & NCS_PARITY)
            icount->parity++;
}

/**
 * do_read - Read in bytes from the port.  Return the number of bytes
 *                actually read.
 * @the_port: port to use
 * @buf: place to put the stuff we read
 * @len: how big 'buf' is
 */

static inline int do_read(struct uart_port *the_port, char *buf, int len)
{
      int prod_ptr, cons_ptr, total;
      struct ioc3_port *port = get_ioc3_port(the_port);
      struct ring *inring;
      struct ring_entry *entry;
      struct port_hooks *hooks = port->ip_hooks;
      int byte_num;
      char *sc;
      int loop_counter;

      BUG_ON(!(len >= 0));
      BUG_ON(!port);

      /* There is a nasty timing issue in the IOC3. When the rx_timer
       * expires or the rx_high condition arises, we take an interrupt.
       * At some point while servicing the interrupt, we read bytes from
       * the ring buffer and re-arm the rx_timer.  However the rx_timer is
       * not started until the first byte is received *after* it is armed,
       * and any bytes pending in the rx construction buffers are not drained
       * to memory until either there are 4 bytes available or the rx_timer
       * expires.  This leads to a potential situation where data is left
       * in the construction buffers forever - 1 to 3 bytes were received
       * after the interrupt was generated but before the rx_timer was
       * re-armed. At that point as long as no subsequent bytes are received
       * the timer will never be started and the bytes will remain in the
       * construction buffer forever.  The solution is to execute a DRAIN
       * command after rearming the timer.  This way any bytes received before
       * the DRAIN will be drained to memory, and any bytes received after
       * the DRAIN will start the TIMER and be drained when it expires.
       * Luckily, this only needs to be done when the DMA buffer is empty
       * since there is no requirement that this function return all
       * available data as long as it returns some.
       */
      /* Re-arm the timer */

      writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir);

      prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
      cons_ptr = port->ip_rx_cons;

      if (prod_ptr == cons_ptr) {
            int reset_dma = 0;

            /* Input buffer appears empty, do a flush. */

            /* DMA must be enabled for this to work. */
            if (!(port->ip_sscr & SSCR_DMA_EN)) {
                  port->ip_sscr |= SSCR_DMA_EN;
                  reset_dma = 1;
            }

            /* Potential race condition: we must reload the srpir after
             * issuing the drain command, otherwise we could think the rx
             * buffer is empty, then take a very long interrupt, and when
             * we come back it's full and we wait forever for the drain to
             * complete.
             */
            writel(port->ip_sscr | SSCR_RX_DRAIN,
                   &port->ip_serial_regs->sscr);
            prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;

            /* We must not wait for the DRAIN to complete unless there are
             * at least 8 bytes (2 ring entries) available to receive the
             * data otherwise the DRAIN will never complete and we'll
             * deadlock here.
             * In fact, to make things easier, I'll just ignore the flush if
             * there is any data at all now available.
             */
            if (prod_ptr == cons_ptr) {
                  loop_counter = 0;
                  while (readl(&port->ip_serial_regs->sscr) &
                         SSCR_RX_DRAIN) {
                        loop_counter++;
                        if (loop_counter > MAXITER)
                              return -1;
                  }

                  /* SIGH. We have to reload the prod_ptr *again* since
                   * the drain may have caused it to change
                   */
                  prod_ptr = readl(&port->ip_serial_regs->srpir)
                      & PROD_CONS_MASK;
            }
            if (reset_dma) {
                  port->ip_sscr &= ~SSCR_DMA_EN;
                  writel(port->ip_sscr, &port->ip_serial_regs->sscr);
            }
      }
      inring = port->ip_inring;
      port->ip_flags &= ~READ_ABORTED;

      total = 0;
      loop_counter = 0xfffff; /* to avoid hangs */

      /* Grab bytes from the hardware */
      while ((prod_ptr != cons_ptr) && (len > 0)) {
            entry = (struct ring_entry *)((caddr_t) inring + cons_ptr);

            if (loop_counter-- <= 0) {
                  printk(KERN_WARNING "IOC3 serial: "
                         "possible hang condition/"
                         "port stuck on read (line %d).\n",
                        the_port->line);
                  break;
            }

            /* According to the producer pointer, this ring entry
             * must contain some data.  But if the PIO happened faster
             * than the DMA, the data may not be available yet, so let's
             * wait until it arrives.
             */
            if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
                  /* Indicate the read is aborted so we don't disable
                   * the interrupt thinking that the consumer is
                   * congested.
                   */
                  port->ip_flags |= READ_ABORTED;
                  len = 0;
                  break;
            }

            /* Load the bytes/status out of the ring entry */
            for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) {
                  sc = &(entry->ring_sc[byte_num]);

                  /* Check for change in modem state or overrun */
                  if ((*sc & RXSB_MODEM_VALID)
                      && (port->ip_notify & N_DDCD)) {
                        /* Notify upper layer if DCD dropped */
                        if ((port->ip_flags & DCD_ON)
                            && !(*sc & RXSB_DCD)) {
                              /* If we have already copied some data,
                               * return it.  We'll pick up the carrier
                               * drop on the next pass.  That way we
                               * don't throw away the data that has
                               * already been copied back to
                               * the caller's buffer.
                               */
                              if (total > 0) {
                                    len = 0;
                                    break;
                              }
                              port->ip_flags &= ~DCD_ON;

                              /* Turn off this notification so the
                               * carrier drop protocol won't see it
                               * again when it does a read.
                               */
                              *sc &= ~RXSB_MODEM_VALID;

                              /* To keep things consistent, we need
                               * to update the consumer pointer so
                               * the next reader won't come in and
                               * try to read the same ring entries
                               * again. This must be done here before
                               * the dcd change.
                               */

                              if ((entry->ring_allsc & RING_ANY_VALID)
                                  == 0) {
                                    cons_ptr += (int)sizeof
                                        (struct ring_entry);
                                    cons_ptr &= PROD_CONS_MASK;
                              }
                              writel(cons_ptr,
                                     &port->ip_serial_regs->srcir);
                              port->ip_rx_cons = cons_ptr;

                              /* Notify upper layer of carrier drop */
                              if ((port->ip_notify & N_DDCD)
                                  && port->ip_port) {
                                    uart_handle_dcd_change
                                          (port->ip_port, 0);
                                    wake_up_interruptible
                                        (&the_port->info->
                                         delta_msr_wait);
                              }

                              /* If we had any data to return, we
                               * would have returned it above.
                               */
                              return 0;
                        }
                  }
                  if (*sc & RXSB_MODEM_VALID) {
                        /* Notify that an input overrun occurred */
                        if ((*sc & RXSB_OVERRUN)
                            && (port->ip_notify & N_OVERRUN_ERROR)) {
                              ioc3_cb_post_ncs(the_port, NCS_OVERRUN);
                        }
                        /* Don't look at this byte again */
                        *sc &= ~RXSB_MODEM_VALID;
                  }

                  /* Check for valid data or RX errors */
                  if ((*sc & RXSB_DATA_VALID) &&
                      ((*sc & (RXSB_PAR_ERR
                             | RXSB_FRAME_ERR | RXSB_BREAK))
                       && (port->ip_notify & (N_PARITY_ERROR
                                        | N_FRAMING_ERROR
                                        | N_BREAK)))) {
                        /* There is an error condition on the next byte.
                         * If we have already transferred some bytes,
                         * we'll stop here. Otherwise if this is the
                         * first byte to be read, we'll just transfer
                         * it alone after notifying the
                         * upper layer of its status.
                         */
                        if (total > 0) {
                              len = 0;
                              break;
                        } else {
                              if ((*sc & RXSB_PAR_ERR) &&
                                  (port->
                                   ip_notify & N_PARITY_ERROR)) {
                                    ioc3_cb_post_ncs(the_port,
                                                 NCS_PARITY);
                              }
                              if ((*sc & RXSB_FRAME_ERR) &&
                                  (port->
                                   ip_notify & N_FRAMING_ERROR)) {
                                    ioc3_cb_post_ncs(the_port,
                                                 NCS_FRAMING);
                              }
                              if ((*sc & RXSB_BREAK)
                                  && (port->ip_notify & N_BREAK)) {
                                    ioc3_cb_post_ncs
                                        (the_port, NCS_BREAK);
                              }
                              len = 1;
                        }
                  }
                  if (*sc & RXSB_DATA_VALID) {
                        *sc &= ~RXSB_DATA_VALID;
                        *buf = entry->ring_data[byte_num];
                        buf++;
                        len--;
                        total++;
                  }
            }

            /* If we used up this entry entirely, go on to the next one,
             * otherwise we must have run out of buffer space, so
             * leave the consumer pointer here for the next read in case
             * there are still unread bytes in this entry.
             */
            if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
                  cons_ptr += (int)sizeof(struct ring_entry);
                  cons_ptr &= PROD_CONS_MASK;
            }
      }

      /* Update consumer pointer and re-arm rx timer interrupt */
      writel(cons_ptr, &port->ip_serial_regs->srcir);
      port->ip_rx_cons = cons_ptr;

      /* If we have now dipped below the rx high water mark and we have
       * rx_high interrupt turned off, we can now turn it back on again.
       */
      if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr)
                                     & PROD_CONS_MASK) <
                                    ((port->
                                    ip_sscr &
                                    SSCR_RX_THRESHOLD)
                                     << PROD_CONS_PTR_OFF))) {
            port->ip_flags &= ~INPUT_HIGH;
            enable_intrs(port, hooks->intr_rx_high);
      }
      return total;
}

/**
 * receive_chars - upper level read.
 * @the_port: port to read from
 */
static int receive_chars(struct uart_port *the_port)
{
      struct tty_struct *tty;
      unsigned char ch[MAX_CHARS];
      int read_count = 0, read_room, flip = 0;
      struct uart_info *info = the_port->info;
      struct ioc3_port *port = get_ioc3_port(the_port);
      unsigned long pflags;

      /* Make sure all the pointers are "good" ones */
      if (!info)
            return 0;
      if (!info->tty)
            return 0;

      if (!(port->ip_flags & INPUT_ENABLE))
            return 0;

      spin_lock_irqsave(&the_port->lock, pflags);
      tty = info->tty;

      read_count = do_read(the_port, ch, MAX_CHARS);
      if (read_count > 0) {
            flip = 1;
            read_room = tty_buffer_request_room(tty, read_count);
            tty_insert_flip_string(tty, ch, read_room);
            the_port->icount.rx += read_count;
      }
      spin_unlock_irqrestore(&the_port->lock, pflags);

      if (flip)
            tty_flip_buffer_push(tty);

      return read_count;
}

/**
 * ioc3uart_intr_one - lowest level (per port) interrupt handler.
 * @is : submodule
 * @idd: driver data
 * @pending: interrupts to handle
 * @regs: pt_regs
 */

static int inline
ioc3uart_intr_one(struct ioc3_submodule *is,
                  struct ioc3_driver_data *idd,
                  unsigned int pending, struct pt_regs *regs)
{
      int port_num = GET_PORT_FROM_SIO_IR(pending);
      struct port_hooks *hooks;
      unsigned int rx_high_rd_aborted = 0;
      unsigned long flags;
      struct uart_port *the_port;
      struct ioc3_port *port;
      int loop_counter;
      struct ioc3_card *card_ptr;
      unsigned int sio_ir;

      card_ptr = idd->data[is->id];
      port = card_ptr->ic_port[port_num].icp_port;
      hooks = port->ip_hooks;

      /* Possible race condition here: The tx_mt interrupt bit may be
       * cleared without the intervention of the interrupt handler,
       * e.g. by a write.  If the top level interrupt handler reads a
       * tx_mt, then some other processor does a write, starting up
       * output, then we come in here, see the tx_mt and stop DMA, the
       * output started by the other processor will hang.  Thus we can
       * only rely on tx_mt being legitimate if it is read while the
       * port lock is held.  Therefore this bit must be ignored in the
       * passed in interrupt mask which was read by the top level
       * interrupt handler since the port lock was not held at the time
       * it was read.  We can only rely on this bit being accurate if it
       * is read while the port lock is held.  So we'll clear it for now,
       * and reload it later once we have the port lock.
       */

      sio_ir = pending & ~(hooks->intr_tx_mt);
      spin_lock_irqsave(&port->ip_lock, flags);

      loop_counter = MAXITER; /* to avoid hangs */

      do {
            uint32_t shadow;

            if (loop_counter-- <= 0) {
                  printk(KERN_WARNING "IOC3 serial: "
                         "possible hang condition/"
                         "port stuck on interrupt (line %d).\n",
                        ((struct uart_port *)port->ip_port)->line);
                  break;
            }
            /* Handle a DCD change */
            if (sio_ir & hooks->intr_delta_dcd) {
                  ioc3_ack(is, idd, hooks->intr_delta_dcd);
                  shadow = readl(&port->ip_serial_regs->shadow);

                  if ((port->ip_notify & N_DDCD)
                      && (shadow & SHADOW_DCD)
                      && (port->ip_port)) {
                        the_port = port->ip_port;
                        uart_handle_dcd_change(the_port,
                                    shadow & SHADOW_DCD);
                        wake_up_interruptible
                            (&the_port->info->delta_msr_wait);
                  } else if ((port->ip_notify & N_DDCD)
                           && !(shadow & SHADOW_DCD)) {
                        /* Flag delta DCD/no DCD */
                        uart_handle_dcd_change(port->ip_port,
                                    shadow & SHADOW_DCD);
                        port->ip_flags |= DCD_ON;
                  }
            }

            /* Handle a CTS change */
            if (sio_ir & hooks->intr_delta_cts) {
                  ioc3_ack(is, idd, hooks->intr_delta_cts);
                  shadow = readl(&port->ip_serial_regs->shadow);

                  if ((port->ip_notify & N_DCTS) && (port->ip_port)) {
                        the_port = port->ip_port;
                        uart_handle_cts_change(the_port, shadow
                                    & SHADOW_CTS);
                        wake_up_interruptible
                            (&the_port->info->delta_msr_wait);
                  }
            }

            /* rx timeout interrupt.  Must be some data available.  Put this
             * before the check for rx_high since servicing this condition
             * may cause that condition to clear.
             */
            if (sio_ir & hooks->intr_rx_timer) {
                  ioc3_ack(is, idd, hooks->intr_rx_timer);
                  if ((port->ip_notify & N_DATA_READY)
                                    && (port->ip_port)) {
                        receive_chars(port->ip_port);
                  }
            }

            /* rx high interrupt. Must be after rx_timer.  */
            else if (sio_ir & hooks->intr_rx_high) {
                  /* Data available, notify upper layer */
                  if ((port->ip_notify & N_DATA_READY) && port->ip_port) {
                        receive_chars(port->ip_port);
                  }

                  /* We can't ACK this interrupt.  If receive_chars didn't
                   * cause the condition to clear, we'll have to disable
                   * the interrupt until the data is drained.
                   * If the read was aborted, don't disable the interrupt
                   * as this may cause us to hang indefinitely.  An
                   * aborted read generally means that this interrupt
                   * hasn't been delivered to the cpu yet anyway, even
                   * though we see it as asserted when we read the sio_ir.
                   */
                  if ((sio_ir = PENDING(card_ptr, idd))
                              & hooks->intr_rx_high) {
                        if (port->ip_flags & READ_ABORTED) {
                              rx_high_rd_aborted++;
                        }
                        else {
                              card_ptr->ic_enable &= ~hooks->intr_rx_high;
                              port->ip_flags |= INPUT_HIGH;
                        }
                  }
            }

            /* We got a low water interrupt: notify upper layer to
             * send more data.  Must come before tx_mt since servicing
             * this condition may cause that condition to clear.
             */
            if (sio_ir & hooks->intr_tx_explicit) {
                  port->ip_flags &= ~LOWAT_WRITTEN;
                  ioc3_ack(is, idd, hooks->intr_tx_explicit);
                  if (port->ip_notify & N_OUTPUT_LOWAT)
                        ioc3_cb_output_lowat(port);
            }

            /* Handle tx_mt.  Must come after tx_explicit.  */
            else if (sio_ir & hooks->intr_tx_mt) {
                  /* If we are expecting a lowat notification
                   * and we get to this point it probably means that for
                   * some reason the tx_explicit didn't work as expected
                   * (that can legitimately happen if the output buffer is
                   * filled up in just the right way).
                   * So send the notification now.
                   */
                  if (port->ip_notify & N_OUTPUT_LOWAT) {
                        ioc3_cb_output_lowat(port);

                        /* We need to reload the sio_ir since the lowat
                         * call may have caused another write to occur,
                         * clearing the tx_mt condition.
                         */
                        sio_ir = PENDING(card_ptr, idd);
                  }

                  /* If the tx_mt condition still persists even after the
                   * lowat call, we've got some work to do.
                   */
                  if (sio_ir & hooks->intr_tx_mt) {
                        /* If we are not currently expecting DMA input,
                         * and the transmitter has just gone idle,
                         * there is no longer any reason for DMA, so
                         * disable it.
                         */
                        if (!(port->ip_notify
                              & (N_DATA_READY | N_DDCD))) {
                              BUG_ON(!(port->ip_sscr
                                     & SSCR_DMA_EN));
                              port->ip_sscr &= ~SSCR_DMA_EN;
                              writel(port->ip_sscr,
                                     &port->ip_serial_regs->sscr);
                        }
                        /* Prevent infinite tx_mt interrupt */
                        card_ptr->ic_enable &= ~hooks->intr_tx_mt;
                  }
            }
            sio_ir = PENDING(card_ptr, idd);

            /* if the read was aborted and only hooks->intr_rx_high,
             * clear hooks->intr_rx_high, so we do not loop forever.
             */

            if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) {
                  sio_ir &= ~hooks->intr_rx_high;
            }
      } while (sio_ir & hooks->intr_all);

      spin_unlock_irqrestore(&port->ip_lock, flags);
      ioc3_enable(is, idd, card_ptr->ic_enable);
      return 0;
}

/**
 * ioc3uart_intr - field all serial interrupts
 * @is : submodule
 * @idd: driver data
 * @pending: interrupts to handle
 * @regs: pt_regs
 *
 */

static int ioc3uart_intr(struct ioc3_submodule *is,
                  struct ioc3_driver_data *idd,
                  unsigned int pending, struct pt_regs *regs)
{
      int ret = 0;

      /*
       * The upper level interrupt handler sends interrupts for both ports
       * here. So we need to call for each port with its interrupts.
       */

      if (pending & SIO_IR_SA)
            ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SA, regs);
      if (pending & SIO_IR_SB)
            ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SB, regs);

      return ret;
}

/**
 * ic3_type
 * @port: Port to operate with (we ignore since we only have one port)
 *
 */
static const char *ic3_type(struct uart_port *the_port)
{
      if (IS_RS232(the_port->line))
            return "SGI IOC3 Serial [rs232]";
      else
            return "SGI IOC3 Serial [rs422]";
}

/**
 * ic3_tx_empty - Is the transmitter empty?
 * @port: Port to operate on
 *
 */
static unsigned int ic3_tx_empty(struct uart_port *the_port)
{
      unsigned int ret = 0;
      struct ioc3_port *port = get_ioc3_port(the_port);

      if (readl(&port->ip_serial_regs->shadow) & SHADOW_TEMT)
            ret = TIOCSER_TEMT;
      return ret;
}

/**
 * ic3_stop_tx - stop the transmitter
 * @port: Port to operate on
 *
 */
static void ic3_stop_tx(struct uart_port *the_port)
{
      struct ioc3_port *port = get_ioc3_port(the_port);

      if (port)
            set_notification(port, N_OUTPUT_LOWAT, 0);
}

/**
 * ic3_stop_rx - stop the receiver
 * @port: Port to operate on
 *
 */
static void ic3_stop_rx(struct uart_port *the_port)
{
      struct ioc3_port *port = get_ioc3_port(the_port);

      if (port)
            port->ip_flags &= ~INPUT_ENABLE;
}

/**
 * null_void_function
 * @port: Port to operate on
 *
 */
static void null_void_function(struct uart_port *the_port)
{
}

/**
 * ic3_shutdown - shut down the port - free irq and disable
 * @port: port to shut down
 *
 */
static void ic3_shutdown(struct uart_port *the_port)
{
      unsigned long port_flags;
      struct ioc3_port *port;
      struct uart_info *info;

      port = get_ioc3_port(the_port);
      if (!port)
            return;

      info = the_port->info;
      wake_up_interruptible(&info->delta_msr_wait);

      spin_lock_irqsave(&the_port->lock, port_flags);
      set_notification(port, N_ALL, 0);
      spin_unlock_irqrestore(&the_port->lock, port_flags);
}

/**
 * ic3_set_mctrl - set control lines (dtr, rts, etc)
 * @port: Port to operate on
 * @mctrl: Lines to set/unset
 *
 */
static void ic3_set_mctrl(struct uart_port *the_port, unsigned int mctrl)
{
      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;

      set_mcr(the_port, mcr, SHADOW_DTR);
}

/**
 * ic3_get_mctrl - get control line info
 * @port: port to operate on
 *
 */
static unsigned int ic3_get_mctrl(struct uart_port *the_port)
{
      struct ioc3_port *port = get_ioc3_port(the_port);
      uint32_t shadow;
      unsigned int ret = 0;

      if (!port)
            return 0;

      shadow = readl(&port->ip_serial_regs->shadow);
      if (shadow & SHADOW_DCD)
            ret |= TIOCM_CD;
      if (shadow & SHADOW_DR)
            ret |= TIOCM_DSR;
      if (shadow & SHADOW_CTS)
            ret |= TIOCM_CTS;
      return ret;
}

/**
 * ic3_start_tx - Start transmitter. Called with the_port->lock
 * @port: Port to operate on
 *
 */
static void ic3_start_tx(struct uart_port *the_port)
{
      struct ioc3_port *port = get_ioc3_port(the_port);

      if (port) {
            set_notification(port, N_OUTPUT_LOWAT, 1);
            enable_intrs(port, port->ip_hooks->intr_tx_mt);
      }
}

/**
 * ic3_break_ctl - handle breaks
 * @port: Port to operate on
 * @break_state: Break state
 *
 */
static void ic3_break_ctl(struct uart_port *the_port, int break_state)
{
}

/**
 * ic3_startup - Start up the serial port - always return 0 (We're always on)
 * @port: Port to operate on
 *
 */
static int ic3_startup(struct uart_port *the_port)
{
      int retval;
      struct ioc3_port *port;
      struct ioc3_card *card_ptr;
      unsigned long port_flags;

      if (!the_port) {
            NOT_PROGRESS();
            return -ENODEV;
      }
      port = get_ioc3_port(the_port);
      if (!port) {
            NOT_PROGRESS();
            return -ENODEV;
      }
      card_ptr = port->ip_card;
      port->ip_port = the_port;

      if (!card_ptr) {
            NOT_PROGRESS();
            return -ENODEV;
      }

      /* Start up the serial port */
      spin_lock_irqsave(&the_port->lock, port_flags);
      retval = ic3_startup_local(the_port);
      spin_unlock_irqrestore(&the_port->lock, port_flags);
      return retval;
}

/**
 * ic3_set_termios - set termios stuff
 * @port: port to operate on
 * @termios: New settings
 * @termios: Old
 *
 */
static void
ic3_set_termios(struct uart_port *the_port,
            struct termios *termios, struct termios *old_termios)
{
      unsigned long port_flags;

      spin_lock_irqsave(&the_port->lock, port_flags);
      ioc3_change_speed(the_port, termios, old_termios);
      spin_unlock_irqrestore(&the_port->lock, port_flags);
}

/**
 * ic3_request_port - allocate resources for port - no op....
 * @port: port to operate on
 *
 */
static int ic3_request_port(struct uart_port *port)
{
      return 0;
}

/* Associate the uart functions above - given to serial core */
static struct uart_ops ioc3_ops = {
      .tx_empty = ic3_tx_empty,
      .set_mctrl = ic3_set_mctrl,
      .get_mctrl = ic3_get_mctrl,
      .stop_tx = ic3_stop_tx,
      .start_tx = ic3_start_tx,
      .stop_rx = ic3_stop_rx,
      .enable_ms = null_void_function,
      .break_ctl = ic3_break_ctl,
      .startup = ic3_startup,
      .shutdown = ic3_shutdown,
      .set_termios = ic3_set_termios,
      .type = ic3_type,
      .release_port = null_void_function,
      .request_port = ic3_request_port,
};

/*
 * Boot-time initialization code
 */

static struct uart_driver ioc3_uart = {
      .owner = THIS_MODULE,
      .driver_name = "ioc3_serial",
      .dev_name = DEVICE_NAME,
      .major = DEVICE_MAJOR,
      .minor = DEVICE_MINOR,
      .nr = MAX_LOGICAL_PORTS
};

/**
 * ioc3_serial_core_attach - register with serial core
 *          This is done during pci probing
 * @is: submodule struct for this
 * @idd: handle for this card
 */
static inline int ioc3_serial_core_attach( struct ioc3_submodule *is,
                        struct ioc3_driver_data *idd)
{
      struct ioc3_port *port;
      struct uart_port *the_port;
      struct ioc3_card *card_ptr = idd->data[is->id];
      int ii, phys_port;
      struct pci_dev *pdev = idd->pdev;

      DPRINT_CONFIG(("%s: attach pdev 0x%p - card_ptr 0x%p\n",
                   __FUNCTION__, pdev, (void *)card_ptr));

      if (!card_ptr)
            return -ENODEV;

      /* once around for each logical port on this card */
      for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) {
            phys_port = GET_PHYSICAL_PORT(ii);
            the_port = &card_ptr->ic_port[phys_port].
                        icp_uart_port[GET_LOGICAL_PORT(ii)];
            port = card_ptr->ic_port[phys_port].icp_port;
            port->ip_port = the_port;

            DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p [%d/%d]\n",
                  __FUNCTION__, (void *)the_port, (void *)port,
                        phys_port, ii));

            /* membase, iobase and mapbase just need to be non-0 */
            the_port->membase = (unsigned char __iomem *)1;
            the_port->iobase = (pdev->bus->number << 16) |  ii;
            the_port->line = (Num_of_ioc3_cards << 2) | ii;
            the_port->mapbase = 1;
            the_port->type = PORT_16550A;
            the_port->fifosize = FIFO_SIZE;
            the_port->ops = &ioc3_ops;
            the_port->irq = idd->irq_io;
            the_port->dev = &pdev->dev;

            if (uart_add_one_port(&ioc3_uart, the_port) < 0) {
                  printk(KERN_WARNING
                      "%s: unable to add port %d bus %d\n",
                         __FUNCTION__, the_port->line, pdev->bus->number);
            } else {
                  DPRINT_CONFIG(("IOC3 serial port %d irq %d bus %d\n",
                      the_port->line, the_port->irq, pdev->bus->number));
            }

            /* all ports are rs232 for now */
            if (IS_PHYSICAL_PORT(ii))
                  ioc3_set_proto(port, PROTO_RS232);
      }
      return 0;
}

/**
 * ioc3uart_remove - register detach function
 * @is: submodule struct for this submodule
 * @idd: ioc3 driver data for this submodule
 */

static int ioc3uart_remove(struct ioc3_submodule *is,
                  struct ioc3_driver_data *idd)
{
      struct ioc3_card *card_ptr = idd->data[is->id];
      struct uart_port *the_port;
      struct ioc3_port *port;
      int ii;

      if (card_ptr) {
            for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) {
                  the_port = &card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].
                              icp_uart_port[GET_LOGICAL_PORT(ii)];
                  if (the_port)
                        uart_remove_one_port(&ioc3_uart, the_port);
                  port = card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].icp_port;
                  if (port && IS_PHYSICAL_PORT(ii)
                              && (GET_PHYSICAL_PORT(ii) == 0)) {
                        pci_free_consistent(port->ip_idd->pdev,
                              TOTAL_RING_BUF_SIZE,
                              (void *)port->ip_cpu_ringbuf,
                              port->ip_dma_ringbuf);
                        kfree(port);
                        card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].
                                          icp_port = NULL;
                  }
            }
            kfree(card_ptr);
            idd->data[is->id] = NULL;
      }
      return 0;
}

/**
 * ioc3uart_probe - card probe function called from shim driver
 * @is: submodule struct for this submodule
 * @idd: ioc3 driver data for this card
 */

static int __devinit
ioc3uart_probe(struct ioc3_submodule *is, struct ioc3_driver_data *idd)
{
      struct pci_dev *pdev = idd->pdev;
      struct ioc3_card *card_ptr;
      int ret = 0;
      struct ioc3_port *port;
      struct ioc3_port *ports[PORTS_PER_CARD];
      int phys_port;

      DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __FUNCTION__, is, idd));

      card_ptr = kmalloc(sizeof(struct ioc3_card), GFP_KERNEL);
      if (!card_ptr) {
            printk(KERN_WARNING "ioc3_attach_one"
                   ": unable to get memory for the IOC3\n");
            return -ENOMEM;
      }
      memset(card_ptr, 0, sizeof(struct ioc3_card));
      idd->data[is->id] = card_ptr;
      Submodule_slot = is->id;

      writel(((UARTA_BASE >> 3) << SIO_CR_SER_A_BASE_SHIFT) |
            ((UARTB_BASE >> 3) << SIO_CR_SER_B_BASE_SHIFT) |
            (0xf << SIO_CR_CMD_PULSE_SHIFT), &idd->vma->sio_cr);

      pci_write_config_dword(pdev, PCI_LAT, 0xff00);

      /* Enable serial port mode select generic PIO pins as outputs */
      ioc3_gpcr_set(idd, GPCR_UARTA_MODESEL | GPCR_UARTB_MODESEL);

      /* Create port structures for each port */
      for (phys_port = 0; phys_port < PORTS_PER_CARD; phys_port++) {
            port = kmalloc(sizeof(struct ioc3_port), GFP_KERNEL);
            if (!port) {
                  printk(KERN_WARNING
                         "IOC3 serial memory not available for port\n");
                  goto out4;
            }
            memset(port, 0, sizeof(struct ioc3_port));
            spin_lock_init(&port->ip_lock);

            /* we need to remember the previous ones, to point back to
             * them farther down - setting up the ring buffers.
             */
            ports[phys_port] = port;

            /* init to something useful */
            card_ptr->ic_port[phys_port].icp_port = port;
            port->ip_is = is;
            port->ip_idd = idd;
            port->ip_baud = 9600;
            port->ip_card = card_ptr;
            port->ip_hooks = &hooks_array[phys_port];

            /* Setup each port */
            if (phys_port == 0) {
                  port->ip_serial_regs = &idd->vma->port_a;
                  port->ip_uart_regs = &idd->vma->sregs.uarta;

                  DPRINT_CONFIG(("%s : Port A ip_serial_regs 0x%p "
                               "ip_uart_regs 0x%p\n",
                               __FUNCTION__,
                               (void *)port->ip_serial_regs,
                               (void *)port->ip_uart_regs));

                  /* setup ring buffers */
                  port->ip_cpu_ringbuf = pci_alloc_consistent(pdev,
                        TOTAL_RING_BUF_SIZE, &port->ip_dma_ringbuf);

                  BUG_ON(!((((int64_t) port->ip_dma_ringbuf) &
                          (TOTAL_RING_BUF_SIZE - 1)) == 0));
                  port->ip_inring = RING(port, RX_A);
                  port->ip_outring = RING(port, TX_A);
                  DPRINT_CONFIG(("%s : Port A ip_cpu_ringbuf 0x%p "
                               "ip_dma_ringbuf 0x%p, ip_inring 0x%p "
                              "ip_outring 0x%p\n",
                               __FUNCTION__,
                               (void *)port->ip_cpu_ringbuf,
                               (void *)port->ip_dma_ringbuf,
                               (void *)port->ip_inring,
                               (void *)port->ip_outring));
            }
            else {
                  port->ip_serial_regs = &idd->vma->port_b;
                  port->ip_uart_regs = &idd->vma->sregs.uartb;

                  DPRINT_CONFIG(("%s : Port B ip_serial_regs 0x%p "
                               "ip_uart_regs 0x%p\n",
                               __FUNCTION__,
                               (void *)port->ip_serial_regs,
                               (void *)port->ip_uart_regs));

                  /* share the ring buffers */
                  port->ip_dma_ringbuf =
                      ports[phys_port - 1]->ip_dma_ringbuf;
                  port->ip_cpu_ringbuf =
                      ports[phys_port - 1]->ip_cpu_ringbuf;
                  port->ip_inring = RING(port, RX_B);
                  port->ip_outring = RING(port, TX_B);
                  DPRINT_CONFIG(("%s : Port B ip_cpu_ringbuf 0x%p "
                               "ip_dma_ringbuf 0x%p, ip_inring 0x%p "
                              "ip_outring 0x%p\n",
                               __FUNCTION__,
                               (void *)port->ip_cpu_ringbuf,
                               (void *)port->ip_dma_ringbuf,
                               (void *)port->ip_inring,
                               (void *)port->ip_outring));
            }

            DPRINT_CONFIG(("%s : port %d [addr 0x%p] card_ptr 0x%p",
                         __FUNCTION__,
                         phys_port, (void *)port, (void *)card_ptr));
            DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n",
                         (void *)port->ip_serial_regs,
                         (void *)port->ip_uart_regs));

            /* Initialize the hardware for IOC3 */
            port_init(port);

            DPRINT_CONFIG(("%s: phys_port %d port 0x%p inring 0x%p "
                         "outring 0x%p\n",
                         __FUNCTION__,
                         phys_port, (void *)port,
                         (void *)port->ip_inring,
                         (void *)port->ip_outring));

      }

      /* register port with the serial core */

      if ((ret = ioc3_serial_core_attach(is, idd)))
            goto out4;

      Num_of_ioc3_cards++;

      return ret;

      /* error exits that give back resources */
out4:
      kfree(card_ptr);
      return ret;
}

static struct ioc3_submodule ioc3uart_submodule = {
      .name = "IOC3uart",
      .probe = ioc3uart_probe,
      .remove = ioc3uart_remove,
      /* call .intr for both ports initially */
      .irq_mask = SIO_IR_SA | SIO_IR_SB,
      .intr = ioc3uart_intr,
      .owner = THIS_MODULE,
};

/**
 * ioc3_detect - module init called,
 */
static int __devinit ioc3uart_init(void)
{
      int ret;

      /* register with serial core */
      if ((ret = uart_register_driver(&ioc3_uart)) < 0) {
            printk(KERN_WARNING
                   "%s: Couldn't register IOC3 uart serial driver\n",
                   __FUNCTION__);
            return ret;
      }
      ret = ioc3_register_submodule(&ioc3uart_submodule);
      if (ret)
            uart_unregister_driver(&ioc3_uart);
      return ret;
}

static void __devexit ioc3uart_exit(void)
{
      ioc3_unregister_submodule(&ioc3uart_submodule);
      uart_unregister_driver(&ioc3_uart);
}

module_init(ioc3uart_init);
module_exit(ioc3uart_exit);

MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>");
MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC3 card");
MODULE_LICENSE("GPL");

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