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qlogicpti.c

/* qlogicpti.c: Performance Technologies QlogicISP sbus card driver.
 *
 * Copyright (C) 1996, 2006 David S. Miller (davem@davemloft.net)
 *
 * A lot of this driver was directly stolen from Erik H. Moe's PCI
 * Qlogic ISP driver.  Mucho kudos to him for this code.
 *
 * An even bigger kudos to John Grana at Performance Technologies
 * for providing me with the hardware to write this driver, you rule
 * John you really do.
 *
 * May, 2, 1997: Added support for QLGC,isp --jj
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/jiffies.h>

#include <asm/byteorder.h>

#include "qlogicpti.h"

#include <asm/sbus.h>
#include <asm/dma.h>
#include <asm/system.h>
#include <asm/ptrace.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_host.h>

#define MAX_TARGETS     16
#define MAX_LUNS  8     /* 32 for 1.31 F/W */

#define DEFAULT_LOOP_COUNT    10000

#include "qlogicpti_asm.c"

static struct qlogicpti *qptichain = NULL;
static DEFINE_SPINLOCK(qptichain_lock);

#define PACKB(a, b)                 (((a)<<4)|(b))

static const u_char mbox_param[] = {
      PACKB(1, 1),      /* MBOX_NO_OP */
      PACKB(5, 5),      /* MBOX_LOAD_RAM */
      PACKB(2, 0),      /* MBOX_EXEC_FIRMWARE */
      PACKB(5, 5),      /* MBOX_DUMP_RAM */
      PACKB(3, 3),      /* MBOX_WRITE_RAM_WORD */
      PACKB(2, 3),      /* MBOX_READ_RAM_WORD */
      PACKB(6, 6),      /* MBOX_MAILBOX_REG_TEST */
      PACKB(2, 3),      /* MBOX_VERIFY_CHECKSUM */
      PACKB(1, 3),      /* MBOX_ABOUT_FIRMWARE */
      PACKB(0, 0),      /* 0x0009 */
      PACKB(0, 0),      /* 0x000a */
      PACKB(0, 0),      /* 0x000b */
      PACKB(0, 0),      /* 0x000c */
      PACKB(0, 0),      /* 0x000d */
      PACKB(1, 2),      /* MBOX_CHECK_FIRMWARE */
      PACKB(0, 0),      /* 0x000f */
      PACKB(5, 5),      /* MBOX_INIT_REQ_QUEUE */
      PACKB(6, 6),      /* MBOX_INIT_RES_QUEUE */
      PACKB(4, 4),      /* MBOX_EXECUTE_IOCB */
      PACKB(2, 2),      /* MBOX_WAKE_UP   */
      PACKB(1, 6),      /* MBOX_STOP_FIRMWARE */
      PACKB(4, 4),      /* MBOX_ABORT */
      PACKB(2, 2),      /* MBOX_ABORT_DEVICE */
      PACKB(3, 3),      /* MBOX_ABORT_TARGET */
      PACKB(2, 2),      /* MBOX_BUS_RESET */
      PACKB(2, 3),      /* MBOX_STOP_QUEUE */
      PACKB(2, 3),      /* MBOX_START_QUEUE */
      PACKB(2, 3),      /* MBOX_SINGLE_STEP_QUEUE */
      PACKB(2, 3),      /* MBOX_ABORT_QUEUE */
      PACKB(2, 4),      /* MBOX_GET_DEV_QUEUE_STATUS */
      PACKB(0, 0),      /* 0x001e */
      PACKB(1, 3),      /* MBOX_GET_FIRMWARE_STATUS */
      PACKB(1, 2),      /* MBOX_GET_INIT_SCSI_ID */
      PACKB(1, 2),      /* MBOX_GET_SELECT_TIMEOUT */
      PACKB(1, 3),      /* MBOX_GET_RETRY_COUNT */
      PACKB(1, 2),      /* MBOX_GET_TAG_AGE_LIMIT */
      PACKB(1, 2),      /* MBOX_GET_CLOCK_RATE */
      PACKB(1, 2),      /* MBOX_GET_ACT_NEG_STATE */
      PACKB(1, 2),      /* MBOX_GET_ASYNC_DATA_SETUP_TIME */
      PACKB(1, 3),      /* MBOX_GET_SBUS_PARAMS */
      PACKB(2, 4),      /* MBOX_GET_TARGET_PARAMS */
      PACKB(2, 4),      /* MBOX_GET_DEV_QUEUE_PARAMS */
      PACKB(0, 0),      /* 0x002a */
      PACKB(0, 0),      /* 0x002b */
      PACKB(0, 0),      /* 0x002c */
      PACKB(0, 0),      /* 0x002d */
      PACKB(0, 0),      /* 0x002e */
      PACKB(0, 0),      /* 0x002f */
      PACKB(2, 2),      /* MBOX_SET_INIT_SCSI_ID */
      PACKB(2, 2),      /* MBOX_SET_SELECT_TIMEOUT */
      PACKB(3, 3),      /* MBOX_SET_RETRY_COUNT */
      PACKB(2, 2),      /* MBOX_SET_TAG_AGE_LIMIT */
      PACKB(2, 2),      /* MBOX_SET_CLOCK_RATE */
      PACKB(2, 2),      /* MBOX_SET_ACTIVE_NEG_STATE */
      PACKB(2, 2),      /* MBOX_SET_ASYNC_DATA_SETUP_TIME */
      PACKB(3, 3),      /* MBOX_SET_SBUS_CONTROL_PARAMS */
      PACKB(4, 4),      /* MBOX_SET_TARGET_PARAMS */
      PACKB(4, 4),      /* MBOX_SET_DEV_QUEUE_PARAMS */
      PACKB(0, 0),      /* 0x003a */
      PACKB(0, 0),      /* 0x003b */
      PACKB(0, 0),      /* 0x003c */
      PACKB(0, 0),      /* 0x003d */
      PACKB(0, 0),      /* 0x003e */
      PACKB(0, 0),      /* 0x003f */
      PACKB(0, 0),      /* 0x0040 */
      PACKB(0, 0),      /* 0x0041 */
      PACKB(0, 0) /* 0x0042 */
};

#define MAX_MBOX_COMMAND      ARRAY_SIZE(mbox_param)

/* queue length's _must_ be power of two: */
#define QUEUE_DEPTH(in, out, ql)    ((in - out) & (ql))
#define REQ_QUEUE_DEPTH(in, out)    QUEUE_DEPTH(in, out,               \
                                        QLOGICPTI_REQ_QUEUE_LEN)
#define RES_QUEUE_DEPTH(in, out)    QUEUE_DEPTH(in, out, RES_QUEUE_LEN)

static inline void qlogicpti_enable_irqs(struct qlogicpti *qpti)
{
      sbus_writew(SBUS_CTRL_ERIRQ | SBUS_CTRL_GENAB,
                qpti->qregs + SBUS_CTRL);
}

static inline void qlogicpti_disable_irqs(struct qlogicpti *qpti)
{
      sbus_writew(0, qpti->qregs + SBUS_CTRL);
}

static inline void set_sbus_cfg1(struct qlogicpti *qpti)
{
      u16 val;
      u8 bursts = qpti->bursts;

#if 0 /* It appears that at least PTI cards do not support
       * 64-byte bursts and that setting the B64 bit actually
       * is a nop and the chip ends up using the smallest burst
       * size. -DaveM
       */
      if (sbus_can_burst64(qpti->sdev) && (bursts & DMA_BURST64)) {
            val = (SBUS_CFG1_BENAB | SBUS_CFG1_B64);
      } else
#endif
      if (bursts & DMA_BURST32) {
            val = (SBUS_CFG1_BENAB | SBUS_CFG1_B32);
      } else if (bursts & DMA_BURST16) {
            val = (SBUS_CFG1_BENAB | SBUS_CFG1_B16);
      } else if (bursts & DMA_BURST8) {
            val = (SBUS_CFG1_BENAB | SBUS_CFG1_B8);
      } else {
            val = 0; /* No sbus bursts for you... */
      }
      sbus_writew(val, qpti->qregs + SBUS_CFG1);
}

static int qlogicpti_mbox_command(struct qlogicpti *qpti, u_short param[], int force)
{
      int loop_count;
      u16 tmp;

      if (mbox_param[param[0]] == 0)
            return 1;

      /* Set SBUS semaphore. */
      tmp = sbus_readw(qpti->qregs + SBUS_SEMAPHORE);
      tmp |= SBUS_SEMAPHORE_LCK;
      sbus_writew(tmp, qpti->qregs + SBUS_SEMAPHORE);

      /* Wait for host IRQ bit to clear. */
      loop_count = DEFAULT_LOOP_COUNT;
      while (--loop_count && (sbus_readw(qpti->qregs + HCCTRL) & HCCTRL_HIRQ)) {
            barrier();
            cpu_relax();
      }
      if (!loop_count)
            printk(KERN_EMERG "qlogicpti%d: mbox_command loop timeout #1\n",
                   qpti->qpti_id);

      /* Write mailbox command registers. */
      switch (mbox_param[param[0]] >> 4) {
      case 6: sbus_writew(param[5], qpti->qregs + MBOX5);
      case 5: sbus_writew(param[4], qpti->qregs + MBOX4);
      case 4: sbus_writew(param[3], qpti->qregs + MBOX3);
      case 3: sbus_writew(param[2], qpti->qregs + MBOX2);
      case 2: sbus_writew(param[1], qpti->qregs + MBOX1);
      case 1: sbus_writew(param[0], qpti->qregs + MBOX0);
      }

      /* Clear RISC interrupt. */
      tmp = sbus_readw(qpti->qregs + HCCTRL);
      tmp |= HCCTRL_CRIRQ;
      sbus_writew(tmp, qpti->qregs + HCCTRL);

      /* Clear SBUS semaphore. */
      sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);

      /* Set HOST interrupt. */
      tmp = sbus_readw(qpti->qregs + HCCTRL);
      tmp |= HCCTRL_SHIRQ;
      sbus_writew(tmp, qpti->qregs + HCCTRL);

      /* Wait for HOST interrupt clears. */
      loop_count = DEFAULT_LOOP_COUNT;
      while (--loop_count &&
             (sbus_readw(qpti->qregs + HCCTRL) & HCCTRL_CRIRQ))
            udelay(20);
      if (!loop_count)
            printk(KERN_EMERG "qlogicpti%d: mbox_command[%04x] loop timeout #2\n",
                   qpti->qpti_id, param[0]);

      /* Wait for SBUS semaphore to get set. */
      loop_count = DEFAULT_LOOP_COUNT;
      while (--loop_count &&
             !(sbus_readw(qpti->qregs + SBUS_SEMAPHORE) & SBUS_SEMAPHORE_LCK)) {
            udelay(20);

            /* Workaround for some buggy chips. */
            if (sbus_readw(qpti->qregs + MBOX0) & 0x4000)
                  break;
      }
      if (!loop_count)
            printk(KERN_EMERG "qlogicpti%d: mbox_command[%04x] loop timeout #3\n",
                   qpti->qpti_id, param[0]);

      /* Wait for MBOX busy condition to go away. */
      loop_count = DEFAULT_LOOP_COUNT;
      while (--loop_count && (sbus_readw(qpti->qregs + MBOX0) == 0x04))
            udelay(20);
      if (!loop_count)
            printk(KERN_EMERG "qlogicpti%d: mbox_command[%04x] loop timeout #4\n",
                   qpti->qpti_id, param[0]);

      /* Read back output parameters. */
      switch (mbox_param[param[0]] & 0xf) {
      case 6: param[5] = sbus_readw(qpti->qregs + MBOX5);
      case 5: param[4] = sbus_readw(qpti->qregs + MBOX4);
      case 4: param[3] = sbus_readw(qpti->qregs + MBOX3);
      case 3: param[2] = sbus_readw(qpti->qregs + MBOX2);
      case 2: param[1] = sbus_readw(qpti->qregs + MBOX1);
      case 1: param[0] = sbus_readw(qpti->qregs + MBOX0);
      }

      /* Clear RISC interrupt. */
      tmp = sbus_readw(qpti->qregs + HCCTRL);
      tmp |= HCCTRL_CRIRQ;
      sbus_writew(tmp, qpti->qregs + HCCTRL);

      /* Release SBUS semaphore. */
      tmp = sbus_readw(qpti->qregs + SBUS_SEMAPHORE);
      tmp &= ~(SBUS_SEMAPHORE_LCK);
      sbus_writew(tmp, qpti->qregs + SBUS_SEMAPHORE);

      /* We're done. */
      return 0;
}

static inline void qlogicpti_set_hostdev_defaults(struct qlogicpti *qpti)
{
      int i;

      qpti->host_param.initiator_scsi_id = qpti->scsi_id;
      qpti->host_param.bus_reset_delay = 3;
      qpti->host_param.retry_count = 0;
      qpti->host_param.retry_delay = 5;
      qpti->host_param.async_data_setup_time = 3;
      qpti->host_param.req_ack_active_negation = 1;
      qpti->host_param.data_line_active_negation = 1;
      qpti->host_param.data_dma_burst_enable = 1;
      qpti->host_param.command_dma_burst_enable = 1;
      qpti->host_param.tag_aging = 8;
      qpti->host_param.selection_timeout = 250;
      qpti->host_param.max_queue_depth = 256;

      for(i = 0; i < MAX_TARGETS; i++) {
            /*
             * disconnect, parity, arq, reneg on reset, and, oddly enough
             * tags...the midlayer's notion of tagged support has to match
             * our device settings, and since we base whether we enable a
             * tag on a  per-cmnd basis upon what the midlayer sez, we
             * actually enable the capability here.
             */
            qpti->dev_param[i].device_flags = 0xcd;
            qpti->dev_param[i].execution_throttle = 16;
            if (qpti->ultra) {
                  qpti->dev_param[i].synchronous_period = 12;
                  qpti->dev_param[i].synchronous_offset = 8;
            } else {
                  qpti->dev_param[i].synchronous_period = 25;
                  qpti->dev_param[i].synchronous_offset = 12;
            }
            qpti->dev_param[i].device_enable = 1;
      }
}

static int qlogicpti_reset_hardware(struct Scsi_Host *host)
{
      struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
      u_short param[6];
      unsigned short risc_code_addr;
      int loop_count, i;
      unsigned long flags;

      risc_code_addr = 0x1000;      /* all load addresses are at 0x1000 */

      spin_lock_irqsave(host->host_lock, flags);

      sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);

      /* Only reset the scsi bus if it is not free. */
      if (sbus_readw(qpti->qregs + CPU_PCTRL) & CPU_PCTRL_BSY) {
            sbus_writew(CPU_ORIDE_RMOD, qpti->qregs + CPU_ORIDE);
            sbus_writew(CPU_CMD_BRESET, qpti->qregs + CPU_CMD);
            udelay(400);
      }

      sbus_writew(SBUS_CTRL_RESET, qpti->qregs + SBUS_CTRL);
      sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + CMD_DMA_CTRL);
      sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + DATA_DMA_CTRL);

      loop_count = DEFAULT_LOOP_COUNT;
      while (--loop_count && ((sbus_readw(qpti->qregs + MBOX0) & 0xff) == 0x04))
            udelay(20);
      if (!loop_count)
            printk(KERN_EMERG "qlogicpti%d: reset_hardware loop timeout\n",
                   qpti->qpti_id);

      sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);
      set_sbus_cfg1(qpti);
      qlogicpti_enable_irqs(qpti);

      if (sbus_readw(qpti->qregs + RISC_PSR) & RISC_PSR_ULTRA) {
            qpti->ultra = 1;
            sbus_writew((RISC_MTREG_P0ULTRA | RISC_MTREG_P1ULTRA),
                      qpti->qregs + RISC_MTREG);
      } else {
            qpti->ultra = 0;
            sbus_writew((RISC_MTREG_P0DFLT | RISC_MTREG_P1DFLT),
                      qpti->qregs + RISC_MTREG);
      }

      /* reset adapter and per-device default values. */
      /* do it after finding out whether we're ultra mode capable */
      qlogicpti_set_hostdev_defaults(qpti);

      /* Release the RISC processor. */
      sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);

      /* Get RISC to start executing the firmware code. */
      param[0] = MBOX_EXEC_FIRMWARE;
      param[1] = risc_code_addr;
      if (qlogicpti_mbox_command(qpti, param, 1)) {
            printk(KERN_EMERG "qlogicpti%d: Cannot execute ISP firmware.\n",
                   qpti->qpti_id);
            spin_unlock_irqrestore(host->host_lock, flags);
            return 1;
      }

      /* Set initiator scsi ID. */
      param[0] = MBOX_SET_INIT_SCSI_ID;
      param[1] = qpti->host_param.initiator_scsi_id;
      if (qlogicpti_mbox_command(qpti, param, 1) ||
         (param[0] != MBOX_COMMAND_COMPLETE)) {
            printk(KERN_EMERG "qlogicpti%d: Cannot set initiator SCSI ID.\n",
                   qpti->qpti_id);
            spin_unlock_irqrestore(host->host_lock, flags);
            return 1;
      }

      /* Initialize state of the queues, both hw and sw. */
      qpti->req_in_ptr = qpti->res_out_ptr = 0;

      param[0] = MBOX_INIT_RES_QUEUE;
      param[1] = RES_QUEUE_LEN + 1;
      param[2] = (u_short) (qpti->res_dvma >> 16);
      param[3] = (u_short) (qpti->res_dvma & 0xffff);
      param[4] = param[5] = 0;
      if (qlogicpti_mbox_command(qpti, param, 1)) {
            printk(KERN_EMERG "qlogicpti%d: Cannot init response queue.\n",
                   qpti->qpti_id);
            spin_unlock_irqrestore(host->host_lock, flags);
            return 1;
      }

      param[0] = MBOX_INIT_REQ_QUEUE;
      param[1] = QLOGICPTI_REQ_QUEUE_LEN + 1;
      param[2] = (u_short) (qpti->req_dvma >> 16);
      param[3] = (u_short) (qpti->req_dvma & 0xffff);
      param[4] = param[5] = 0;
      if (qlogicpti_mbox_command(qpti, param, 1)) {
            printk(KERN_EMERG "qlogicpti%d: Cannot init request queue.\n",
                   qpti->qpti_id);
            spin_unlock_irqrestore(host->host_lock, flags);
            return 1;
      }

      param[0] = MBOX_SET_RETRY_COUNT;
      param[1] = qpti->host_param.retry_count;
      param[2] = qpti->host_param.retry_delay;
      qlogicpti_mbox_command(qpti, param, 0);

      param[0] = MBOX_SET_TAG_AGE_LIMIT;
      param[1] = qpti->host_param.tag_aging;
      qlogicpti_mbox_command(qpti, param, 0);

      for (i = 0; i < MAX_TARGETS; i++) {
            param[0] = MBOX_GET_DEV_QUEUE_PARAMS;
            param[1] = (i << 8);
            qlogicpti_mbox_command(qpti, param, 0);
      }

      param[0] = MBOX_GET_FIRMWARE_STATUS;
      qlogicpti_mbox_command(qpti, param, 0);

      param[0] = MBOX_SET_SELECT_TIMEOUT;
      param[1] = qpti->host_param.selection_timeout;
      qlogicpti_mbox_command(qpti, param, 0);

      for (i = 0; i < MAX_TARGETS; i++) {
            param[0] = MBOX_SET_TARGET_PARAMS;
            param[1] = (i << 8);
            param[2] = (qpti->dev_param[i].device_flags << 8);
            /*
             * Since we're now loading 1.31 f/w, force narrow/async.
             */
            param[2] |= 0xc0;
            param[3] = 0;     /* no offset, we do not have sync mode yet */
            qlogicpti_mbox_command(qpti, param, 0);
      }

      /*
       * Always (sigh) do an initial bus reset (kicks f/w).
       */
      param[0] = MBOX_BUS_RESET;
      param[1] = qpti->host_param.bus_reset_delay;
      qlogicpti_mbox_command(qpti, param, 0);
      qpti->send_marker = 1;

      spin_unlock_irqrestore(host->host_lock, flags);
      return 0;
}

#define PTI_RESET_LIMIT 400

static int __devinit qlogicpti_load_firmware(struct qlogicpti *qpti)
{
      struct Scsi_Host *host = qpti->qhost;
      unsigned short csum = 0;
      unsigned short param[6];
      unsigned short *risc_code, risc_code_addr, risc_code_length;
      unsigned long flags;
      int i, timeout;

      risc_code = &sbus_risc_code01[0];
      risc_code_addr = 0x1000;      /* all f/w modules load at 0x1000 */
      risc_code_length = sbus_risc_code_length01;

      spin_lock_irqsave(host->host_lock, flags);

      /* Verify the checksum twice, one before loading it, and once
       * afterwards via the mailbox commands.
       */
      for (i = 0; i < risc_code_length; i++)
            csum += risc_code[i];
      if (csum) {
            spin_unlock_irqrestore(host->host_lock, flags);
            printk(KERN_EMERG "qlogicpti%d: Aieee, firmware checksum failed!",
                   qpti->qpti_id);
            return 1;
      }           
      sbus_writew(SBUS_CTRL_RESET, qpti->qregs + SBUS_CTRL);
      sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + CMD_DMA_CTRL);
      sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + DATA_DMA_CTRL);
      timeout = PTI_RESET_LIMIT;
      while (--timeout && (sbus_readw(qpti->qregs + SBUS_CTRL) & SBUS_CTRL_RESET))
            udelay(20);
      if (!timeout) {
            spin_unlock_irqrestore(host->host_lock, flags);
            printk(KERN_EMERG "qlogicpti%d: Cannot reset the ISP.", qpti->qpti_id);
            return 1;
      }

      sbus_writew(HCCTRL_RESET, qpti->qregs + HCCTRL);
      mdelay(1);

      sbus_writew((SBUS_CTRL_GENAB | SBUS_CTRL_ERIRQ), qpti->qregs + SBUS_CTRL);
      set_sbus_cfg1(qpti);
      sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);

      if (sbus_readw(qpti->qregs + RISC_PSR) & RISC_PSR_ULTRA) {
            qpti->ultra = 1;
            sbus_writew((RISC_MTREG_P0ULTRA | RISC_MTREG_P1ULTRA),
                      qpti->qregs + RISC_MTREG);
      } else {
            qpti->ultra = 0;
            sbus_writew((RISC_MTREG_P0DFLT | RISC_MTREG_P1DFLT),
                      qpti->qregs + RISC_MTREG);
      }

      sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);

      /* Pin lines are only stable while RISC is paused. */
      sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);
      if (sbus_readw(qpti->qregs + CPU_PDIFF) & CPU_PDIFF_MODE)
            qpti->differential = 1;
      else
            qpti->differential = 0;
      sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);

      /* This shouldn't be necessary- we've reset things so we should be
         running from the ROM now.. */

      param[0] = MBOX_STOP_FIRMWARE;
      param[1] = param[2] = param[3] = param[4] = param[5] = 0;
      if (qlogicpti_mbox_command(qpti, param, 1)) {
            printk(KERN_EMERG "qlogicpti%d: Cannot stop firmware for reload.\n",
                   qpti->qpti_id);
            spin_unlock_irqrestore(host->host_lock, flags);
            return 1;
      }           

      /* Load it up.. */
      for (i = 0; i < risc_code_length; i++) {
            param[0] = MBOX_WRITE_RAM_WORD;
            param[1] = risc_code_addr + i;
            param[2] = risc_code[i];
            if (qlogicpti_mbox_command(qpti, param, 1) ||
                param[0] != MBOX_COMMAND_COMPLETE) {
                  printk("qlogicpti%d: Firmware dload failed, I'm bolixed!\n",
                         qpti->qpti_id);
                  spin_unlock_irqrestore(host->host_lock, flags);
                  return 1;
            }
      }

      /* Reset the ISP again. */
      sbus_writew(HCCTRL_RESET, qpti->qregs + HCCTRL);
      mdelay(1);

      qlogicpti_enable_irqs(qpti);
      sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
      sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);

      /* Ask ISP to verify the checksum of the new code. */
      param[0] = MBOX_VERIFY_CHECKSUM;
      param[1] = risc_code_addr;
      if (qlogicpti_mbox_command(qpti, param, 1) ||
          (param[0] != MBOX_COMMAND_COMPLETE)) {
            printk(KERN_EMERG "qlogicpti%d: New firmware csum failure!\n",
                   qpti->qpti_id);
            spin_unlock_irqrestore(host->host_lock, flags);
            return 1;
      }

      /* Start using newly downloaded firmware. */
      param[0] = MBOX_EXEC_FIRMWARE;
      param[1] = risc_code_addr;
      qlogicpti_mbox_command(qpti, param, 1);

      param[0] = MBOX_ABOUT_FIRMWARE;
      if (qlogicpti_mbox_command(qpti, param, 1) ||
          (param[0] != MBOX_COMMAND_COMPLETE)) {
            printk(KERN_EMERG "qlogicpti%d: AboutFirmware cmd fails.\n",
                   qpti->qpti_id);
            spin_unlock_irqrestore(host->host_lock, flags);
            return 1;
      }

      /* Snag the major and minor revisions from the result. */
      qpti->fware_majrev = param[1];
      qpti->fware_minrev = param[2];
      qpti->fware_micrev = param[3];

      /* Set the clock rate */
      param[0] = MBOX_SET_CLOCK_RATE;
      param[1] = qpti->clock;
      if (qlogicpti_mbox_command(qpti, param, 1) ||
          (param[0] != MBOX_COMMAND_COMPLETE)) {
            printk(KERN_EMERG "qlogicpti%d: could not set clock rate.\n",
                   qpti->qpti_id);
            spin_unlock_irqrestore(host->host_lock, flags);
            return 1;
      }

      if (qpti->is_pti != 0) {
            /* Load scsi initiator ID and interrupt level into sbus static ram. */
            param[0] = MBOX_WRITE_RAM_WORD;
            param[1] = 0xff80;
            param[2] = (unsigned short) qpti->scsi_id;
            qlogicpti_mbox_command(qpti, param, 1);

            param[0] = MBOX_WRITE_RAM_WORD;
            param[1] = 0xff00;
            param[2] = (unsigned short) 3;
            qlogicpti_mbox_command(qpti, param, 1);
      }

      spin_unlock_irqrestore(host->host_lock, flags);
      return 0;
}

static int qlogicpti_verify_tmon(struct qlogicpti *qpti)
{
      int curstat = sbus_readb(qpti->sreg);

      curstat &= 0xf0;
      if (!(curstat & SREG_FUSE) && (qpti->swsreg & SREG_FUSE))
            printk("qlogicpti%d: Fuse returned to normal state.\n", qpti->qpti_id);
      if (!(curstat & SREG_TPOWER) && (qpti->swsreg & SREG_TPOWER))
            printk("qlogicpti%d: termpwr back to normal state.\n", qpti->qpti_id);
      if (curstat != qpti->swsreg) {
            int error = 0;
            if (curstat & SREG_FUSE) {
                  error++;
                  printk("qlogicpti%d: Fuse is open!\n", qpti->qpti_id);
            }
            if (curstat & SREG_TPOWER) {
                  error++;
                  printk("qlogicpti%d: termpwr failure\n", qpti->qpti_id);
            }
            if (qpti->differential &&
                (curstat & SREG_DSENSE) != SREG_DSENSE) {
                  error++;
                  printk("qlogicpti%d: You have a single ended device on a "
                         "differential bus!  Please fix!\n", qpti->qpti_id);
            }
            qpti->swsreg = curstat;
            return error;
      }
      return 0;
}

static irqreturn_t qpti_intr(int irq, void *dev_id);

static void __init qpti_chain_add(struct qlogicpti *qpti)
{
      spin_lock_irq(&qptichain_lock);
      if (qptichain != NULL) {
            struct qlogicpti *qlink = qptichain;

            while(qlink->next)
                  qlink = qlink->next;
            qlink->next = qpti;
      } else {
            qptichain = qpti;
      }
      qpti->next = NULL;
      spin_unlock_irq(&qptichain_lock);
}

static void __init qpti_chain_del(struct qlogicpti *qpti)
{
      spin_lock_irq(&qptichain_lock);
      if (qptichain == qpti) {
            qptichain = qpti->next;
      } else {
            struct qlogicpti *qlink = qptichain;
            while(qlink->next != qpti)
                  qlink = qlink->next;
            qlink->next = qpti->next;
      }
      qpti->next = NULL;
      spin_unlock_irq(&qptichain_lock);
}

static int __init qpti_map_regs(struct qlogicpti *qpti)
{
      struct sbus_dev *sdev = qpti->sdev;

      qpti->qregs = sbus_ioremap(&sdev->resource[0], 0,
                           sdev->reg_addrs[0].reg_size,
                           "PTI Qlogic/ISP");
      if (!qpti->qregs) {
            printk("PTI: Qlogic/ISP registers are unmappable\n");
            return -1;
      }
      if (qpti->is_pti) {
            qpti->sreg = sbus_ioremap(&sdev->resource[0], (16 * 4096),
                                sizeof(unsigned char),
                                "PTI Qlogic/ISP statreg");
            if (!qpti->sreg) {
                  printk("PTI: Qlogic/ISP status register is unmappable\n");
                  return -1;
            }
      }
      return 0;
}

static int __init qpti_register_irq(struct qlogicpti *qpti)
{
      struct sbus_dev *sdev = qpti->sdev;

      qpti->qhost->irq = qpti->irq = sdev->irqs[0];

      /* We used to try various overly-clever things to
       * reduce the interrupt processing overhead on
       * sun4c/sun4m when multiple PTI's shared the
       * same IRQ.  It was too complex and messy to
       * sanely maintain.
       */
      if (request_irq(qpti->irq, qpti_intr,
                  IRQF_SHARED, "Qlogic/PTI", qpti))
            goto fail;

      printk("qlogicpti%d: IRQ %d ", qpti->qpti_id, qpti->irq);

      return 0;

fail:
      printk("qlogicpti%d: Cannot acquire irq line\n", qpti->qpti_id);
      return -1;
}

static void __init qpti_get_scsi_id(struct qlogicpti *qpti)
{
      qpti->scsi_id = prom_getintdefault(qpti->prom_node,
                                 "initiator-id",
                                 -1);
      if (qpti->scsi_id == -1)
            qpti->scsi_id = prom_getintdefault(qpti->prom_node,
                                       "scsi-initiator-id",
                                       -1);
      if (qpti->scsi_id == -1)
            qpti->scsi_id =
                  prom_getintdefault(qpti->sdev->bus->prom_node,
                                 "scsi-initiator-id", 7);
      qpti->qhost->this_id = qpti->scsi_id;
      qpti->qhost->max_sectors = 64;

      printk("SCSI ID %d ", qpti->scsi_id);
}

static void qpti_get_bursts(struct qlogicpti *qpti)
{
      struct sbus_dev *sdev = qpti->sdev;
      u8 bursts, bmask;

      bursts = prom_getintdefault(qpti->prom_node, "burst-sizes", 0xff);
      bmask = prom_getintdefault(sdev->bus->prom_node,
                           "burst-sizes", 0xff);
      if (bmask != 0xff)
            bursts &= bmask;
      if (bursts == 0xff ||
          (bursts & DMA_BURST16) == 0 ||
          (bursts & DMA_BURST32) == 0)
            bursts = (DMA_BURST32 - 1);

      qpti->bursts = bursts;
}

static void qpti_get_clock(struct qlogicpti *qpti)
{
      unsigned int cfreq;

      /* Check for what the clock input to this card is.
       * Default to 40Mhz.
       */
      cfreq = prom_getintdefault(qpti->prom_node,"clock-frequency",40000000);
      qpti->clock = (cfreq + 500000)/1000000;
      if (qpti->clock == 0) /* bullshit */
            qpti->clock = 40;
}

/* The request and response queues must each be aligned
 * on a page boundary.
 */
static int __init qpti_map_queues(struct qlogicpti *qpti)
{
      struct sbus_dev *sdev = qpti->sdev;

#define QSIZE(entries)  (((entries) + 1) * QUEUE_ENTRY_LEN)
      qpti->res_cpu = sbus_alloc_consistent(sdev,
                                    QSIZE(RES_QUEUE_LEN),
                                    &qpti->res_dvma);
      if (qpti->res_cpu == NULL ||
          qpti->res_dvma == 0) {
            printk("QPTI: Cannot map response queue.\n");
            return -1;
      }

      qpti->req_cpu = sbus_alloc_consistent(sdev,
                                    QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
                                    &qpti->req_dvma);
      if (qpti->req_cpu == NULL ||
          qpti->req_dvma == 0) {
            sbus_free_consistent(sdev, QSIZE(RES_QUEUE_LEN),
                             qpti->res_cpu, qpti->res_dvma);
            printk("QPTI: Cannot map request queue.\n");
            return -1;
      }
      memset(qpti->res_cpu, 0, QSIZE(RES_QUEUE_LEN));
      memset(qpti->req_cpu, 0, QSIZE(QLOGICPTI_REQ_QUEUE_LEN));
      return 0;
}

const char *qlogicpti_info(struct Scsi_Host *host)
{
      static char buf[80];
      struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;

      sprintf(buf, "PTI Qlogic,ISP SBUS SCSI irq %d regs at %p",
            qpti->qhost->irq, qpti->qregs);
      return buf;
}

/* I am a certified frobtronicist. */
static inline void marker_frob(struct Command_Entry *cmd)
{
      struct Marker_Entry *marker = (struct Marker_Entry *) cmd;

      memset(marker, 0, sizeof(struct Marker_Entry));
      marker->hdr.entry_cnt = 1;
      marker->hdr.entry_type = ENTRY_MARKER;
      marker->modifier = SYNC_ALL;
      marker->rsvd = 0;
}

static inline void cmd_frob(struct Command_Entry *cmd, struct scsi_cmnd *Cmnd,
                      struct qlogicpti *qpti)
{
      memset(cmd, 0, sizeof(struct Command_Entry));
      cmd->hdr.entry_cnt = 1;
      cmd->hdr.entry_type = ENTRY_COMMAND;
      cmd->target_id = Cmnd->device->id;
      cmd->target_lun = Cmnd->device->lun;
      cmd->cdb_length = Cmnd->cmd_len;
      cmd->control_flags = 0;
      if (Cmnd->device->tagged_supported) {
            if (qpti->cmd_count[Cmnd->device->id] == 0)
                  qpti->tag_ages[Cmnd->device->id] = jiffies;
            if (time_after(jiffies, qpti->tag_ages[Cmnd->device->id] + (5*HZ))) {
                  cmd->control_flags = CFLAG_ORDERED_TAG;
                  qpti->tag_ages[Cmnd->device->id] = jiffies;
            } else
                  cmd->control_flags = CFLAG_SIMPLE_TAG;
      }
      if ((Cmnd->cmnd[0] == WRITE_6) ||
          (Cmnd->cmnd[0] == WRITE_10) ||
          (Cmnd->cmnd[0] == WRITE_12))
            cmd->control_flags |= CFLAG_WRITE;
      else
            cmd->control_flags |= CFLAG_READ;
      cmd->time_out = 30;
      memcpy(cmd->cdb, Cmnd->cmnd, Cmnd->cmd_len);
}

/* Do it to it baby. */
static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
                     struct qlogicpti *qpti, u_int in_ptr, u_int out_ptr)
{
      struct dataseg *ds;
      struct scatterlist *sg, *s;
      int i, n;

      if (Cmnd->use_sg) {
            int sg_count;

            sg = (struct scatterlist *) Cmnd->request_buffer;
            sg_count = sbus_map_sg(qpti->sdev, sg, Cmnd->use_sg, Cmnd->sc_data_direction);

            ds = cmd->dataseg;
            cmd->segment_cnt = sg_count;

            /* Fill in first four sg entries: */
            n = sg_count;
            if (n > 4)
                  n = 4;
            for_each_sg(sg, s, n, i) {
                  ds[i].d_base = sg_dma_address(s);
                  ds[i].d_count = sg_dma_len(s);
            }
            sg_count -= 4;
            sg = s;
            while (sg_count > 0) {
                  struct Continuation_Entry *cont;

                  ++cmd->hdr.entry_cnt;
                  cont = (struct Continuation_Entry *) &qpti->req_cpu[in_ptr];
                  in_ptr = NEXT_REQ_PTR(in_ptr);
                  if (in_ptr == out_ptr)
                        return -1;

                  cont->hdr.entry_type = ENTRY_CONTINUATION;
                  cont->hdr.entry_cnt = 0;
                  cont->hdr.sys_def_1 = 0;
                  cont->hdr.flags = 0;
                  cont->reserved = 0;
                  ds = cont->dataseg;
                  n = sg_count;
                  if (n > 7)
                        n = 7;
                  for_each_sg(sg, s, n, i) {
                        ds[i].d_base = sg_dma_address(s);
                        ds[i].d_count = sg_dma_len(s);
                  }
                  sg_count -= n;
            }
      } else if (Cmnd->request_bufflen) {
            Cmnd->SCp.ptr = (char *)(unsigned long)
                  sbus_map_single(qpti->sdev,
                              Cmnd->request_buffer,
                              Cmnd->request_bufflen,
                              Cmnd->sc_data_direction);

            cmd->dataseg[0].d_base = (u32) ((unsigned long)Cmnd->SCp.ptr);
            cmd->dataseg[0].d_count = Cmnd->request_bufflen;
            cmd->segment_cnt = 1;
      } else {
            cmd->dataseg[0].d_base = 0;
            cmd->dataseg[0].d_count = 0;
            cmd->segment_cnt = 1; /* Shouldn't this be 0? */
      }

      /* Committed, record Scsi_Cmd so we can find it later. */
      cmd->handle = in_ptr;
      qpti->cmd_slots[in_ptr] = Cmnd;

      qpti->cmd_count[Cmnd->device->id]++;
      sbus_writew(in_ptr, qpti->qregs + MBOX4);
      qpti->req_in_ptr = in_ptr;

      return in_ptr;
}

static inline void update_can_queue(struct Scsi_Host *host, u_int in_ptr, u_int out_ptr)
{
      /* Temporary workaround until bug is found and fixed (one bug has been found
         already, but fixing it makes things even worse) -jj */
      int num_free = QLOGICPTI_REQ_QUEUE_LEN - REQ_QUEUE_DEPTH(in_ptr, out_ptr) - 64;
      host->can_queue = host->host_busy + num_free;
      host->sg_tablesize = QLOGICPTI_MAX_SG(num_free);
}

static int qlogicpti_slave_configure(struct scsi_device *sdev)
{
      struct qlogicpti *qpti = shost_priv(sdev->host);
      int tgt = sdev->id;
      u_short param[6];

      /* tags handled in midlayer */
      /* enable sync mode? */
      if (sdev->sdtr) {
            qpti->dev_param[tgt].device_flags |= 0x10;
      } else {
            qpti->dev_param[tgt].synchronous_offset = 0;
            qpti->dev_param[tgt].synchronous_period = 0;
      }
      /* are we wide capable? */
      if (sdev->wdtr)
            qpti->dev_param[tgt].device_flags |= 0x20;

      param[0] = MBOX_SET_TARGET_PARAMS;
      param[1] = (tgt << 8);
      param[2] = (qpti->dev_param[tgt].device_flags << 8);
      if (qpti->dev_param[tgt].device_flags & 0x10) {
            param[3] = (qpti->dev_param[tgt].synchronous_offset << 8) |
                  qpti->dev_param[tgt].synchronous_period;
      } else {
            param[3] = 0;
      }
      qlogicpti_mbox_command(qpti, param, 0);
      return 0;
}

/*
 * The middle SCSI layer ensures that queuecommand never gets invoked
 * concurrently with itself or the interrupt handler (though the
 * interrupt handler may call this routine as part of
 * request-completion handling).
 *
 * "This code must fly." -davem
 */
static int qlogicpti_queuecommand(struct scsi_cmnd *Cmnd, void (*done)(struct scsi_cmnd *))
{
      struct Scsi_Host *host = Cmnd->device->host;
      struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
      struct Command_Entry *cmd;
      u_int out_ptr;
      int in_ptr;

      Cmnd->scsi_done = done;

      in_ptr = qpti->req_in_ptr;
      cmd = (struct Command_Entry *) &qpti->req_cpu[in_ptr];
      out_ptr = sbus_readw(qpti->qregs + MBOX4);
      in_ptr = NEXT_REQ_PTR(in_ptr);
      if (in_ptr == out_ptr)
            goto toss_command;

      if (qpti->send_marker) {
            marker_frob(cmd);
            qpti->send_marker = 0;
            if (NEXT_REQ_PTR(in_ptr) == out_ptr) {
                  sbus_writew(in_ptr, qpti->qregs + MBOX4);
                  qpti->req_in_ptr = in_ptr;
                  goto toss_command;
            }
            cmd = (struct Command_Entry *) &qpti->req_cpu[in_ptr];
            in_ptr = NEXT_REQ_PTR(in_ptr);
      }
      cmd_frob(cmd, Cmnd, qpti);
      if ((in_ptr = load_cmd(Cmnd, cmd, qpti, in_ptr, out_ptr)) == -1)
            goto toss_command;

      update_can_queue(host, in_ptr, out_ptr);

      return 0;

toss_command:
      printk(KERN_EMERG "qlogicpti%d: request queue overflow\n",
             qpti->qpti_id);

      /* Unfortunately, unless you use the new EH code, which
       * we don't, the midlayer will ignore the return value,
       * which is insane.  We pick up the pieces like this.
       */
      Cmnd->result = DID_BUS_BUSY;
      done(Cmnd);
      return 1;
}

static int qlogicpti_return_status(struct Status_Entry *sts, int id)
{
      int host_status = DID_ERROR;

      switch (sts->completion_status) {
            case CS_COMPLETE:
            host_status = DID_OK;
            break;
            case CS_INCOMPLETE:
            if (!(sts->state_flags & SF_GOT_BUS))
                  host_status = DID_NO_CONNECT;
            else if (!(sts->state_flags & SF_GOT_TARGET))
                  host_status = DID_BAD_TARGET;
            else if (!(sts->state_flags & SF_SENT_CDB))
                  host_status = DID_ERROR;
            else if (!(sts->state_flags & SF_TRANSFERRED_DATA))
                  host_status = DID_ERROR;
            else if (!(sts->state_flags & SF_GOT_STATUS))
                  host_status = DID_ERROR;
            else if (!(sts->state_flags & SF_GOT_SENSE))
                  host_status = DID_ERROR;
            break;
            case CS_DMA_ERROR:
            case CS_TRANSPORT_ERROR:
            host_status = DID_ERROR;
            break;
            case CS_RESET_OCCURRED:
            case CS_BUS_RESET:
            host_status = DID_RESET;
            break;
            case CS_ABORTED:
            host_status = DID_ABORT;
            break;
            case CS_TIMEOUT:
            host_status = DID_TIME_OUT;
            break;
            case CS_DATA_OVERRUN:
            case CS_COMMAND_OVERRUN:
            case CS_STATUS_OVERRUN:
            case CS_BAD_MESSAGE:
            case CS_NO_MESSAGE_OUT:
            case CS_EXT_ID_FAILED:
            case CS_IDE_MSG_FAILED:
            case CS_ABORT_MSG_FAILED:
            case CS_NOP_MSG_FAILED:
            case CS_PARITY_ERROR_MSG_FAILED:
            case CS_DEVICE_RESET_MSG_FAILED:
            case CS_ID_MSG_FAILED:
            case CS_UNEXP_BUS_FREE:
            host_status = DID_ERROR;
            break;
            case CS_DATA_UNDERRUN:
            host_status = DID_OK;
            break;
            default:
            printk(KERN_EMERG "qlogicpti%d: unknown completion status 0x%04x\n",
                   id, sts->completion_status);
            host_status = DID_ERROR;
            break;
      }

      return (sts->scsi_status & STATUS_MASK) | (host_status << 16);
}

static struct scsi_cmnd *qlogicpti_intr_handler(struct qlogicpti *qpti)
{
      struct scsi_cmnd *Cmnd, *done_queue = NULL;
      struct Status_Entry *sts;
      u_int in_ptr, out_ptr;

      if (!(sbus_readw(qpti->qregs + SBUS_STAT) & SBUS_STAT_RINT))
            return NULL;
            
      in_ptr = sbus_readw(qpti->qregs + MBOX5);
      sbus_writew(HCCTRL_CRIRQ, qpti->qregs + HCCTRL);
      if (sbus_readw(qpti->qregs + SBUS_SEMAPHORE) & SBUS_SEMAPHORE_LCK) {
            switch (sbus_readw(qpti->qregs + MBOX0)) {
            case ASYNC_SCSI_BUS_RESET:
            case EXECUTION_TIMEOUT_RESET:
                  qpti->send_marker = 1;
                  break;
            case INVALID_COMMAND:
            case HOST_INTERFACE_ERROR:
            case COMMAND_ERROR:
            case COMMAND_PARAM_ERROR:
                  break;
            };
            sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
      }

      /* This looks like a network driver! */
      out_ptr = qpti->res_out_ptr;
      while (out_ptr != in_ptr) {
            u_int cmd_slot;

            sts = (struct Status_Entry *) &qpti->res_cpu[out_ptr];
            out_ptr = NEXT_RES_PTR(out_ptr);

            /* We store an index in the handle, not the pointer in
             * some form.  This avoids problems due to the fact
             * that the handle provided is only 32-bits. -DaveM
             */
            cmd_slot = sts->handle;
            Cmnd = qpti->cmd_slots[cmd_slot];
            qpti->cmd_slots[cmd_slot] = NULL;

            if (sts->completion_status == CS_RESET_OCCURRED ||
                sts->completion_status == CS_ABORTED ||
                (sts->status_flags & STF_BUS_RESET))
                  qpti->send_marker = 1;

            if (sts->state_flags & SF_GOT_SENSE)
                  memcpy(Cmnd->sense_buffer, sts->req_sense_data,
                         sizeof(Cmnd->sense_buffer));

            if (sts->hdr.entry_type == ENTRY_STATUS)
                  Cmnd->result =
                      qlogicpti_return_status(sts, qpti->qpti_id);
            else
                  Cmnd->result = DID_ERROR << 16;

            if (Cmnd->use_sg) {
                  sbus_unmap_sg(qpti->sdev,
                              (struct scatterlist *)Cmnd->request_buffer,
                              Cmnd->use_sg,
                              Cmnd->sc_data_direction);
            } else if (Cmnd->request_bufflen) {
                  sbus_unmap_single(qpti->sdev,
                                (__u32)((unsigned long)Cmnd->SCp.ptr),
                                Cmnd->request_bufflen,
                                Cmnd->sc_data_direction);
            }
            qpti->cmd_count[Cmnd->device->id]--;
            sbus_writew(out_ptr, qpti->qregs + MBOX5);
            Cmnd->host_scribble = (unsigned char *) done_queue;
            done_queue = Cmnd;
      }
      qpti->res_out_ptr = out_ptr;

      return done_queue;
}

static irqreturn_t qpti_intr(int irq, void *dev_id)
{
      struct qlogicpti *qpti = dev_id;
      unsigned long flags;
      struct scsi_cmnd *dq;

      spin_lock_irqsave(qpti->qhost->host_lock, flags);
      dq = qlogicpti_intr_handler(qpti);

      if (dq != NULL) {
            do {
                  struct scsi_cmnd *next;

                  next = (struct scsi_cmnd *) dq->host_scribble;
                  dq->scsi_done(dq);
                  dq = next;
            } while (dq != NULL);
      }
      spin_unlock_irqrestore(qpti->qhost->host_lock, flags);

      return IRQ_HANDLED;
}

static int qlogicpti_abort(struct scsi_cmnd *Cmnd)
{
      u_short param[6];
      struct Scsi_Host *host = Cmnd->device->host;
      struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
      int return_status = SUCCESS;
      u32 cmd_cookie;
      int i;

      printk(KERN_WARNING "qlogicpti%d: Aborting cmd for tgt[%d] lun[%d]\n",
             qpti->qpti_id, (int)Cmnd->device->id, (int)Cmnd->device->lun);

      qlogicpti_disable_irqs(qpti);

      /* Find the 32-bit cookie we gave to the firmware for
       * this command.
       */
      for (i = 0; i < QLOGICPTI_REQ_QUEUE_LEN + 1; i++)
            if (qpti->cmd_slots[i] == Cmnd)
                  break;
      cmd_cookie = i;

      param[0] = MBOX_ABORT;
      param[1] = (((u_short) Cmnd->device->id) << 8) | Cmnd->device->lun;
      param[2] = cmd_cookie >> 16;
      param[3] = cmd_cookie & 0xffff;
      if (qlogicpti_mbox_command(qpti, param, 0) ||
          (param[0] != MBOX_COMMAND_COMPLETE)) {
            printk(KERN_EMERG "qlogicpti%d: scsi abort failure: %x\n",
                   qpti->qpti_id, param[0]);
            return_status = FAILED;
      }

      qlogicpti_enable_irqs(qpti);

      return return_status;
}

static int qlogicpti_reset(struct scsi_cmnd *Cmnd)
{
      u_short param[6];
      struct Scsi_Host *host = Cmnd->device->host;
      struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
      int return_status = SUCCESS;

      printk(KERN_WARNING "qlogicpti%d: Resetting SCSI bus!\n",
             qpti->qpti_id);

      qlogicpti_disable_irqs(qpti);

      param[0] = MBOX_BUS_RESET;
      param[1] = qpti->host_param.bus_reset_delay;
      if (qlogicpti_mbox_command(qpti, param, 0) ||
         (param[0] != MBOX_COMMAND_COMPLETE)) {
            printk(KERN_EMERG "qlogicisp%d: scsi bus reset failure: %x\n",
                   qpti->qpti_id, param[0]);
            return_status = FAILED;
      }

      qlogicpti_enable_irqs(qpti);

      return return_status;
}

static struct scsi_host_template qpti_template = {
      .module                 = THIS_MODULE,
      .name             = "qlogicpti",
      .info             = qlogicpti_info,
      .queuecommand           = qlogicpti_queuecommand,
      .slave_configure  = qlogicpti_slave_configure,
      .eh_abort_handler = qlogicpti_abort,
      .eh_bus_reset_handler   = qlogicpti_reset,
      .can_queue        = QLOGICPTI_REQ_QUEUE_LEN,
      .this_id          = 7,
      .sg_tablesize           = QLOGICPTI_MAX_SG(QLOGICPTI_REQ_QUEUE_LEN),
      .cmd_per_lun            = 1,
      .use_clustering         = ENABLE_CLUSTERING,
};

static int __devinit qpti_sbus_probe(struct of_device *dev, const struct of_device_id *match)
{
      static int nqptis;
      struct sbus_dev *sdev = to_sbus_device(&dev->dev);
      struct device_node *dp = dev->node;
      struct scsi_host_template *tpnt = match->data;
      struct Scsi_Host *host;
      struct qlogicpti *qpti;
      const char *fcode;

      /* Sometimes Antares cards come up not completely
       * setup, and we get a report of a zero IRQ.
       */
      if (sdev->irqs[0] == 0)
            return -ENODEV;

      host = scsi_host_alloc(tpnt, sizeof(struct qlogicpti));
      if (!host)
            return -ENOMEM;

      qpti = (struct qlogicpti *) host->hostdata;

      host->max_id = MAX_TARGETS;
      qpti->qhost = host;
      qpti->sdev = sdev;
      qpti->qpti_id = nqptis;
      qpti->prom_node = sdev->prom_node;
      strcpy(qpti->prom_name, sdev->ofdev.node->name);
      qpti->is_pti = strcmp(qpti->prom_name, "QLGC,isp");

      if (qpti_map_regs(qpti) < 0)
            goto fail_unlink;

      if (qpti_register_irq(qpti) < 0)
            goto fail_unmap_regs;

      qpti_get_scsi_id(qpti);
      qpti_get_bursts(qpti);
      qpti_get_clock(qpti);

      /* Clear out scsi_cmnd array. */
      memset(qpti->cmd_slots, 0, sizeof(qpti->cmd_slots));

      if (qpti_map_queues(qpti) < 0)
            goto fail_free_irq;

      /* Load the firmware. */
      if (qlogicpti_load_firmware(qpti))
            goto fail_unmap_queues;
      if (qpti->is_pti) {
            /* Check the PTI status reg. */
            if (qlogicpti_verify_tmon(qpti))
                  goto fail_unmap_queues;
      }

      /* Reset the ISP and init res/req queues. */
      if (qlogicpti_reset_hardware(host))
            goto fail_unmap_queues;

      printk("(Firmware v%d.%d.%d)", qpti->fware_majrev,
             qpti->fware_minrev, qpti->fware_micrev);

      fcode = of_get_property(dp, "isp-fcode", NULL);
      if (fcode && fcode[0])
            printk("(FCode %s)", fcode);
      if (of_find_property(dp, "differential", NULL) != NULL)
            qpti->differential = 1;
                  
      printk("\nqlogicpti%d: [%s Wide, using %s interface]\n",
            qpti->qpti_id,
            (qpti->ultra ? "Ultra" : "Fast"),
            (qpti->differential ? "differential" : "single ended"));

      if (scsi_add_host(host, &dev->dev)) {
            printk("qlogicpti%d: Failed scsi_add_host\n", qpti->qpti_id);
            goto fail_unmap_queues;
      }

      dev_set_drvdata(&sdev->ofdev.dev, qpti);

      qpti_chain_add(qpti);

      scsi_scan_host(host);
      nqptis++;

      return 0;

fail_unmap_queues:
#define QSIZE(entries)  (((entries) + 1) * QUEUE_ENTRY_LEN)
      sbus_free_consistent(qpti->sdev,
                       QSIZE(RES_QUEUE_LEN),
                       qpti->res_cpu, qpti->res_dvma);
      sbus_free_consistent(qpti->sdev,
                       QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
                       qpti->req_cpu, qpti->req_dvma);
#undef QSIZE

fail_unmap_regs:
      sbus_iounmap(qpti->qregs,
                 qpti->sdev->reg_addrs[0].reg_size);
      if (qpti->is_pti)
            sbus_iounmap(qpti->sreg, sizeof(unsigned char));

fail_free_irq:
      free_irq(qpti->irq, qpti);

fail_unlink:
      scsi_host_put(host);

      return -ENODEV;
}

static int __devexit qpti_sbus_remove(struct of_device *dev)
{
      struct qlogicpti *qpti = dev_get_drvdata(&dev->dev);

      qpti_chain_del(qpti);

      scsi_remove_host(qpti->qhost);

      /* Shut up the card. */
      sbus_writew(0, qpti->qregs + SBUS_CTRL);

      /* Free IRQ handler and unmap Qlogic,ISP and PTI status regs. */
      free_irq(qpti->irq, qpti);

#define QSIZE(entries)  (((entries) + 1) * QUEUE_ENTRY_LEN)
      sbus_free_consistent(qpti->sdev,
                       QSIZE(RES_QUEUE_LEN),
                       qpti->res_cpu, qpti->res_dvma);
      sbus_free_consistent(qpti->sdev,
                       QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
                       qpti->req_cpu, qpti->req_dvma);
#undef QSIZE

      sbus_iounmap(qpti->qregs, qpti->sdev->reg_addrs[0].reg_size);
      if (qpti->is_pti)
            sbus_iounmap(qpti->sreg, sizeof(unsigned char));

      scsi_host_put(qpti->qhost);

      return 0;
}

static struct of_device_id qpti_match[] = {
      {
            .name = "ptisp",
            .data = &qpti_template,
      },
      {
            .name = "PTI,ptisp",
            .data = &qpti_template,
      },
      {
            .name = "QLGC,isp",
            .data = &qpti_template,
      },
      {
            .name = "SUNW,isp",
            .data = &qpti_template,
      },
      {},
};
MODULE_DEVICE_TABLE(of, qpti_match);

static struct of_platform_driver qpti_sbus_driver = {
      .name       = "qpti",
      .match_table      = qpti_match,
      .probe            = qpti_sbus_probe,
      .remove           = __devexit_p(qpti_sbus_remove),
};

static int __init qpti_init(void)
{
      return of_register_driver(&qpti_sbus_driver, &sbus_bus_type);
}

static void __exit qpti_exit(void)
{
      of_unregister_driver(&qpti_sbus_driver);
}

MODULE_DESCRIPTION("QlogicISP SBUS driver");
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_LICENSE("GPL");
MODULE_VERSION("2.0");

module_init(qpti_init);
module_exit(qpti_exit);

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