/*
 * Initio A100 device driver for Linux.
 *
 * Copyright (c) 1994-1998 Initio Corporation
 * Copyright (c) 2003-2004 Christoph Hellwig
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Revision History:
 * 07/02/98 hl  - v.91n Initial drivers.
 * 09/14/98 hl - v1.01 Support new Kernel.
 * 09/22/98 hl - v1.01a Support reset.
 * 09/24/98 hl - v1.01b Fixed reset.
 * 10/05/98 hl - v1.02 split the source code and release.
 * 12/19/98 bv - v1.02a Use spinlocks for 2.1.95 and up
 * 01/31/99 bv - v1.02b Use mdelay instead of waitForPause
 * 08/08/99 bv - v1.02c Use waitForPause again.
 * 06/25/02 Doug Ledford <dledford@redhat.com> - v1.02d
 *          - Remove limit on number of controllers
 *          - Port to DMA mapping API
 *          - Clean up interrupt handler registration
 *          - Fix memory leaks
 *          - Fix allocation of scsi host structs and private data
 * 11/18/03 Christoph Hellwig <hch@lst.de>
 *          - Port to new probing API
 *          - Fix some more leaks in init failure cases
 * 9/28/04 Christoph Hellwig <hch@lst.de>
 *          - merge the two source files
 *          - remove internal queueing code
 * 14/06/07 Alan Cox <alan@lxorguk.ukuu.org.uk>
 *       - Grand cleanup and Linuxisation
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/dma-mapping.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_host.h>

#include "a100u2w.h"


static struct orc_scb *__orc_alloc_scb(struct orc_host * host);
static void inia100_scb_handler(struct orc_host *host, struct orc_scb *scb);

static struct orc_nvram nvram, *nvramp = &nvram;

static u8 default_nvram[64] =
{
/*----------header -------------*/
        0x01,                   /* 0x00: Sub System Vendor ID 0 */
        0x11,                   /* 0x01: Sub System Vendor ID 1 */
        0x60,                   /* 0x02: Sub System ID 0        */
        0x10,                   /* 0x03: Sub System ID 1        */
        0x00,                   /* 0x04: SubClass               */
        0x01,                   /* 0x05: Vendor ID 0            */
        0x11,                   /* 0x06: Vendor ID 1            */
        0x60,                   /* 0x07: Device ID 0            */
        0x10,                   /* 0x08: Device ID 1            */
        0x00,                   /* 0x09: Reserved               */
        0x00,                   /* 0x0A: Reserved               */
        0x01,                   /* 0x0B: Revision of Data Structure     */
                                /* -- Host Adapter Structure --- */
        0x01,                   /* 0x0C: Number Of SCSI Channel */
        0x01,                   /* 0x0D: BIOS Configuration 1   */
        0x00,                   /* 0x0E: BIOS Configuration 2   */
        0x00,                   /* 0x0F: BIOS Configuration 3   */
                                /* --- SCSI Channel 0 Configuration --- */
        0x07,                   /* 0x10: H/A ID                 */
        0x83,                   /* 0x11: Channel Configuration  */
        0x20,                   /* 0x12: MAX TAG per target     */
        0x0A,                   /* 0x13: SCSI Reset Recovering time     */
        0x00,                   /* 0x14: Channel Configuration4 */
        0x00,                   /* 0x15: Channel Configuration5 */
                                /* SCSI Channel 0 Target Configuration  */
                                /* 0x16-0x25                    */
        0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8,
        0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8,
                                /* --- SCSI Channel 1 Configuration --- */
        0x07,                   /* 0x26: H/A ID                 */
        0x83,                   /* 0x27: Channel Configuration  */
        0x20,                   /* 0x28: MAX TAG per target     */
        0x0A,                   /* 0x29: SCSI Reset Recovering time     */
        0x00,                   /* 0x2A: Channel Configuration4 */
        0x00,                   /* 0x2B: Channel Configuration5 */
                                /* SCSI Channel 1 Target Configuration  */
                                /* 0x2C-0x3B                    */
        0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8,
        0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8, 0xC8,
        0x00,                   /* 0x3C: Reserved               */
        0x00,                   /* 0x3D: Reserved               */
        0x00,                   /* 0x3E: Reserved               */
        0x00                    /* 0x3F: Checksum               */
};


static u8 wait_chip_ready(struct orc_host * host)
{
        int i;

        for (i = 0; i < 10; i++) {      /* Wait 1 second for report timeout     */
                if (inb(host->base + ORC_HCTRL) & HOSTSTOP)     /* Wait HOSTSTOP set */
                        return 1;
                msleep(100);
        }
        return 0;
}

static u8 wait_firmware_ready(struct orc_host * host)
{
        int i;

        for (i = 0; i < 10; i++) {      /* Wait 1 second for report timeout     */
                if (inb(host->base + ORC_HSTUS) & RREADY)               /* Wait READY set */
                        return 1;
                msleep(100);    /* wait 100ms before try again  */
        }
        return 0;
}

/***************************************************************************/
static u8 wait_scsi_reset_done(struct orc_host * host)
{
        int i;

        for (i = 0; i < 10; i++) {      /* Wait 1 second for report timeout     */
                if (!(inb(host->base + ORC_HCTRL) & SCSIRST))   /* Wait SCSIRST done */
                        return 1;
                mdelay(100);    /* wait 100ms before try again  */
        }
        return 0;
}

/***************************************************************************/
static u8 wait_HDO_off(struct orc_host * host)
{
        int i;

        for (i = 0; i < 10; i++) {      /* Wait 1 second for report timeout     */
                if (!(inb(host->base + ORC_HCTRL) & HDO))               /* Wait HDO off */
                        return 1;
                mdelay(100);    /* wait 100ms before try again  */
        }
        return 0;
}

/***************************************************************************/
static u8 wait_hdi_set(struct orc_host * host, u8 * data)
{
        int i;

        for (i = 0; i < 10; i++) {      /* Wait 1 second for report timeout     */
                if ((*data = inb(host->base + ORC_HSTUS)) & HDI)
                        return 1;       /* Wait HDI set */
                mdelay(100);    /* wait 100ms before try again  */
        }
        return 0;
}

/***************************************************************************/
static unsigned short orc_read_fwrev(struct orc_host * host)
{
        u16 version;
        u8 data;

        outb(ORC_CMD_VERSION, host->base + ORC_HDATA);
        outb(HDO, host->base + ORC_HCTRL);
        if (wait_HDO_off(host) == 0)    /* Wait HDO off   */
                return 0;

        if (wait_hdi_set(host, &data) == 0)     /* Wait HDI set   */
                return 0;
        version = inb(host->base + ORC_HDATA);
        outb(data, host->base + ORC_HSTUS);     /* Clear HDI            */

        if (wait_hdi_set(host, &data) == 0)     /* Wait HDI set   */
                return 0;
        version |= inb(host->base + ORC_HDATA) << 8;
        outb(data, host->base + ORC_HSTUS);     /* Clear HDI            */

        return version;
}

/***************************************************************************/
static u8 orc_nv_write(struct orc_host * host, unsigned char address, unsigned char value)
{
        outb(ORC_CMD_SET_NVM, host->base + ORC_HDATA);  /* Write command */
        outb(HDO, host->base + ORC_HCTRL);
        if (wait_HDO_off(host) == 0)    /* Wait HDO off   */
                return 0;

        outb(address, host->base + ORC_HDATA);  /* Write address */
        outb(HDO, host->base + ORC_HCTRL);
        if (wait_HDO_off(host) == 0)    /* Wait HDO off   */
                return 0;

        outb(value, host->base + ORC_HDATA);    /* Write value  */
        outb(HDO, host->base + ORC_HCTRL);
        if (wait_HDO_off(host) == 0)    /* Wait HDO off   */
                return 0;

        return 1;
}

/***************************************************************************/
static u8 orc_nv_read(struct orc_host * host, u8 address, u8 *ptr)
{
        unsigned char data;

        outb(ORC_CMD_GET_NVM, host->base + ORC_HDATA);  /* Write command */
        outb(HDO, host->base + ORC_HCTRL);
        if (wait_HDO_off(host) == 0)    /* Wait HDO off   */
                return 0;

        outb(address, host->base + ORC_HDATA);  /* Write address */
        outb(HDO, host->base + ORC_HCTRL);
        if (wait_HDO_off(host) == 0)    /* Wait HDO off   */
                return 0;

        if (wait_hdi_set(host, &data) == 0)     /* Wait HDI set   */
                return 0;
        *ptr = inb(host->base + ORC_HDATA);
        outb(data, host->base + ORC_HSTUS);     /* Clear HDI    */

        return 1;

}

/**
 *      orc_exec_scb            -       Queue an SCB with the HA
 *      @host: host adapter the SCB belongs to
 *      @scb: SCB to queue for execution
 */

static void orc_exec_scb(struct orc_host * host, struct orc_scb * scb)
{
        scb->status = ORCSCB_POST;
        outb(scb->scbidx, host->base + ORC_PQUEUE);
}


/**
 *      se2_rd_all      -       read SCSI parameters from EEPROM
 *      @host: Host whose EEPROM is being loaded
 *
 *      Read SCSI H/A configuration parameters from serial EEPROM
 */

static int se2_rd_all(struct orc_host * host)
{
        int i;
        u8 *np, chksum = 0;

        np = (u8 *) nvramp;
        for (i = 0; i < 64; i++, np++) {        /* <01> */
                if (orc_nv_read(host, (u8) i, np) == 0)
                        return -1;
        }

        /*------ Is ckecksum ok ? ------*/
        np = (u8 *) nvramp;
        for (i = 0; i < 63; i++)
                chksum += *np++;

        if (nvramp->CheckSum != (u8) chksum)
                return -1;
        return 1;
}

/**
 *      se2_update_all          -       update the EEPROM
 *      @host: Host whose EEPROM is being updated
 *
 *      Update changed bytes in the EEPROM image.
 */

static void se2_update_all(struct orc_host * host)
{                               /* setup default pattern  */
        int i;
        u8 *np, *np1, chksum = 0;

        /* Calculate checksum first   */
        np = (u8 *) default_nvram;
        for (i = 0; i < 63; i++)
                chksum += *np++;
        *np = chksum;

        np = (u8 *) default_nvram;
        np1 = (u8 *) nvramp;
        for (i = 0; i < 64; i++, np++, np1++) {
                if (*np != *np1)
                        orc_nv_write(host, (u8) i, *np);
        }
}

/**
 *      read_eeprom             -       load EEPROM
 *      @host: Host EEPROM to read
 *
 *      Read the EEPROM for a given host. If it is invalid or fails
 *      the restore the defaults and use them.
 */

static void read_eeprom(struct orc_host * host)
{
        if (se2_rd_all(host) != 1) {
                se2_update_all(host);   /* setup default pattern        */
                se2_rd_all(host);       /* load again                   */
        }
}


/**
 *      orc_load_firmware       -       initialise firmware
 *      @host: Host to set up
 *
 *      Load the firmware from the EEPROM into controller SRAM. This
 *      is basically a 4K block copy and then a 4K block read to check
 *      correctness. The rest is convulted by the indirect interfaces
 *      in the hardware
 */

static u8 orc_load_firmware(struct orc_host * host)
{
        u32 data32;
        u16 bios_addr;
        u16 i;
        u8 *data32_ptr, data;


        /* Set up the EEPROM for access */

        data = inb(host->base + ORC_GCFG);
        outb(data | EEPRG, host->base + ORC_GCFG);      /* Enable EEPROM programming */
        outb(0x00, host->base + ORC_EBIOSADR2);
        outw(0x0000, host->base + ORC_EBIOSADR0);
        if (inb(host->base + ORC_EBIOSDATA) != 0x55) {
                outb(data, host->base + ORC_GCFG);      /* Disable EEPROM programming */
                return 0;
        }
        outw(0x0001, host->base + ORC_EBIOSADR0);
        if (inb(host->base + ORC_EBIOSDATA) != 0xAA) {
                outb(data, host->base + ORC_GCFG);      /* Disable EEPROM programming */
                return 0;
        }

        outb(PRGMRST | DOWNLOAD, host->base + ORC_RISCCTL);     /* Enable SRAM programming */
        data32_ptr = (u8 *) & data32;
        data32 = cpu_to_le32(0);                /* Initial FW address to 0 */
        outw(0x0010, host->base + ORC_EBIOSADR0);
        *data32_ptr = inb(host->base + ORC_EBIOSDATA);          /* Read from BIOS */
        outw(0x0011, host->base + ORC_EBIOSADR0);
        *(data32_ptr + 1) = inb(host->base + ORC_EBIOSDATA);    /* Read from BIOS */
        outw(0x0012, host->base + ORC_EBIOSADR0);
        *(data32_ptr + 2) = inb(host->base + ORC_EBIOSDATA);    /* Read from BIOS */
        outw(*(data32_ptr + 2), host->base + ORC_EBIOSADR2);
        outl(le32_to_cpu(data32), host->base + ORC_FWBASEADR);          /* Write FW address */

        /* Copy the code from the BIOS to the SRAM */

        udelay(500);    /* Required on Sun Ultra 5 ... 350 -> failures */
        bios_addr = (u16) le32_to_cpu(data32);  /* FW code locate at BIOS address + ? */
        for (i = 0, data32_ptr = (u8 *) & data32;       /* Download the code    */
             i < 0x1000;        /* Firmware code size = 4K      */
             i++, bios_addr++) {
                outw(bios_addr, host->base + ORC_EBIOSADR0);
                *data32_ptr++ = inb(host->base + ORC_EBIOSDATA);        /* Read from BIOS */
                if ((i % 4) == 3) {
                        outl(le32_to_cpu(data32), host->base + ORC_RISCRAM);    /* Write every 4 bytes */
                        data32_ptr = (u8 *) & data32;
                }
        }

        /* Go back and check they match */

        outb(PRGMRST | DOWNLOAD, host->base + ORC_RISCCTL);     /* Reset program count 0 */
        bios_addr -= 0x1000;    /* Reset the BIOS address */
        for (i = 0, data32_ptr = (u8 *) & data32;       /* Check the code       */
             i < 0x1000;        /* Firmware code size = 4K      */
             i++, bios_addr++) {
                outw(bios_addr, host->base + ORC_EBIOSADR0);
                *data32_ptr++ = inb(host->base + ORC_EBIOSDATA);        /* Read from BIOS */
                if ((i % 4) == 3) {
                        if (inl(host->base + ORC_RISCRAM) != le32_to_cpu(data32)) {
                                outb(PRGMRST, host->base + ORC_RISCCTL);        /* Reset program to 0 */
                                outb(data, host->base + ORC_GCFG);      /*Disable EEPROM programming */
                                return 0;
                        }
                        data32_ptr = (u8 *) & data32;
                }
        }

        /* Success */
        outb(PRGMRST, host->base + ORC_RISCCTL);        /* Reset program to 0   */
        outb(data, host->base + ORC_GCFG);      /* Disable EEPROM programming */
        return 1;
}

/***************************************************************************/
static void setup_SCBs(struct orc_host * host)
{
        struct orc_scb *scb;
        int i;
        struct orc_extended_scb *escb;
        dma_addr_t escb_phys;

        /* Setup SCB base and SCB Size registers */
        outb(ORC_MAXQUEUE, host->base + ORC_SCBSIZE);   /* Total number of SCBs */
        /* SCB base address 0      */
        outl(host->scb_phys, host->base + ORC_SCBBASE0);
        /* SCB base address 1      */
        outl(host->scb_phys, host->base + ORC_SCBBASE1);

        /* setup scatter list address with one buffer */
        scb = host->scb_virt;
        escb = host->escb_virt;

        for (i = 0; i < ORC_MAXQUEUE; i++) {
                escb_phys = (host->escb_phys + (sizeof(struct orc_extended_scb) * i));
                scb->sg_addr = cpu_to_le32((u32) escb_phys);
                scb->sense_addr = cpu_to_le32((u32) escb_phys);
                scb->escb = escb;
                scb->scbidx = i;
                scb++;
                escb++;
        }
}

/**
 *      init_alloc_map          -       initialise allocation map
 *      @host: host map to configure
 *
 *      Initialise the allocation maps for this device. If the device
 *      is not quiescent the caller must hold the allocation lock
 */

static void init_alloc_map(struct orc_host * host)
{
        u8 i, j;

        for (i = 0; i < MAX_CHANNELS; i++) {
                for (j = 0; j < 8; j++) {
                        host->allocation_map[i][j] = 0xffffffff;
                }
        }
}

/**
 *      init_orchid             -       initialise the host adapter
 *      @host:host adapter to initialise
 *
 *      Initialise the controller and if necessary load the firmware.
 *
 *      Returns -1 if the initialisation fails.
 */

static int init_orchid(struct orc_host * host)
{
        u8 *ptr;
        u16 revision;
        u8 i;

        init_alloc_map(host);
        outb(0xFF, host->base + ORC_GIMSK);     /* Disable all interrupts */

        if (inb(host->base + ORC_HSTUS) & RREADY) {     /* Orchid is ready */
                revision = orc_read_fwrev(host);
                if (revision == 0xFFFF) {
                        outb(DEVRST, host->base + ORC_HCTRL);   /* Reset Host Adapter   */
                        if (wait_chip_ready(host) == 0)
                                return -1;
                        orc_load_firmware(host);        /* Download FW                  */
                        setup_SCBs(host);       /* Setup SCB base and SCB Size registers */
                        outb(0x00, host->base + ORC_HCTRL);     /* clear HOSTSTOP       */
                        if (wait_firmware_ready(host) == 0)
                                return -1;
                        /* Wait for firmware ready     */
                } else {
                        setup_SCBs(host);       /* Setup SCB base and SCB Size registers */
                }
        } else {                /* Orchid is not Ready          */
                outb(DEVRST, host->base + ORC_HCTRL);   /* Reset Host Adapter   */
                if (wait_chip_ready(host) == 0)
                        return -1;
                orc_load_firmware(host);        /* Download FW                  */
                setup_SCBs(host);       /* Setup SCB base and SCB Size registers */
                outb(HDO, host->base + ORC_HCTRL);      /* Do Hardware Reset &  */

                /*     clear HOSTSTOP  */
                if (wait_firmware_ready(host) == 0)             /* Wait for firmware ready      */
                        return -1;
        }

        /* Load an EEProm copy into RAM */
        /* Assumes single threaded at this point */
        read_eeprom(host);

        if (nvramp->revision != 1)
                return -1;

        host->scsi_id = nvramp->scsi_id;
        host->BIOScfg = nvramp->BIOSConfig1;
        host->max_targets = MAX_TARGETS;
        ptr = (u8 *) & (nvramp->Target00Config);
        for (i = 0; i < 16; ptr++, i++) {
                host->target_flag[i] = *ptr;
                host->max_tags[i] = ORC_MAXTAGS;
        }

        if (nvramp->SCSI0Config & NCC_BUSRESET)
                host->flags |= HCF_SCSI_RESET;
        outb(0xFB, host->base + ORC_GIMSK);     /* enable RP FIFO interrupt     */
        return 0;
}

/**
 *      orc_reset_scsi_bus              -       perform bus reset
 *      @host: host being reset
 *
 *      Perform a full bus reset on the adapter.
 */

static int orc_reset_scsi_bus(struct orc_host * host)
{                               /* I need Host Control Block Information */
        unsigned long flags;

        spin_lock_irqsave(&host->allocation_lock, flags);

        init_alloc_map(host);
        /* reset scsi bus */
        outb(SCSIRST, host->base + ORC_HCTRL);
        /* FIXME: We can spend up to a second with the lock held and
           interrupts off here */
        if (wait_scsi_reset_done(host) == 0) {
                spin_unlock_irqrestore(&host->allocation_lock, flags);
                return FAILED;
        } else {
                spin_unlock_irqrestore(&host->allocation_lock, flags);
                return SUCCESS;
        }
}

/**
 *      orc_device_reset        -       device reset handler
 *      @host: host to reset
 *      @cmd: command causing the reset
 *      @target: target device
 *
 *      Reset registers, reset a hanging bus and kill active and disconnected
 *      commands for target w/o soft reset
 */

static int orc_device_reset(struct orc_host * host, struct scsi_cmnd *cmd, unsigned int target)
{                               /* I need Host Control Block Information */
        struct orc_scb *scb;
        struct orc_extended_scb *escb;
        struct orc_scb *host_scb;
        u8 i;
        unsigned long flags;

        spin_lock_irqsave(&(host->allocation_lock), flags);
        scb = (struct orc_scb *) NULL;
        escb = (struct orc_extended_scb *) NULL;

        /* setup scatter list address with one buffer */
        host_scb = host->scb_virt;

        /* FIXME: is this safe if we then fail to issue the reset or race
           a completion ? */
        init_alloc_map(host);

        /* Find the scb corresponding to the command */
        for (i = 0; i < ORC_MAXQUEUE; i++) {
                escb = host_scb->escb;
                if (host_scb->status && escb->srb == cmd)
                        break;
                host_scb++;
        }

        if (i == ORC_MAXQUEUE) {
                printk(KERN_ERR "Unable to Reset - No SCB Found\n");
                spin_unlock_irqrestore(&(host->allocation_lock), flags);
                return FAILED;
        }

        /* Allocate a new SCB for the reset command to the firmware */
        if ((scb = __orc_alloc_scb(host)) == NULL) {
                /* Can't happen.. */
                spin_unlock_irqrestore(&(host->allocation_lock), flags);
                return FAILED;
        }

        /* Reset device is handled by the firmware, we fill in an SCB and
           fire it at the controller, it does the rest */
        scb->opcode = ORC_BUSDEVRST;
        scb->target = target;
        scb->hastat = 0;
        scb->tastat = 0;
        scb->status = 0x0;
        scb->link = 0xFF;
        scb->reserved0 = 0;
        scb->reserved1 = 0;
        scb->xferlen = cpu_to_le32(0);
        scb->sg_len = cpu_to_le32(0);

        escb->srb = NULL;
        escb->srb = cmd;
        orc_exec_scb(host, scb);        /* Start execute SCB            */
        spin_unlock_irqrestore(&host->allocation_lock, flags);
        return SUCCESS;
}

/**
 *      __orc_alloc_scb         -               allocate an SCB
 *      @host: host to allocate from
 *
 *      Allocate an SCB and return a pointer to the SCB object. NULL
 *      is returned if no SCB is free. The caller must already hold
 *      the allocator lock at this point.
 */


static struct orc_scb *__orc_alloc_scb(struct orc_host * host)
{
        u8 channel;
        unsigned long idx;
        u8 index;
        u8 i;

        channel = host->index;
        for (i = 0; i < 8; i++) {
                for (index = 0; index < 32; index++) {
                        if ((host->allocation_map[channel][i] >> index) & 0x01) {
                                host->allocation_map[channel][i] &= ~(1 << index);
                                idx = index + 32 * i;
                                /*
                                 * Translate the index to a structure instance
                                 */
                                return host->scb_virt + idx;
                        }
                }
        }
        return NULL;
}

/**
 *      orc_alloc_scb           -               allocate an SCB
 *      @host: host to allocate from
 *
 *      Allocate an SCB and return a pointer to the SCB object. NULL
 *      is returned if no SCB is free.
 */

static struct orc_scb *orc_alloc_scb(struct orc_host * host)
{
        struct orc_scb *scb;
        unsigned long flags;

        spin_lock_irqsave(&host->allocation_lock, flags);
        scb = __orc_alloc_scb(host);
        spin_unlock_irqrestore(&host->allocation_lock, flags);
        return scb;
}

/**
 *      orc_release_scb                 -       release an SCB
 *      @host: host owning the SCB
 *      @scb: SCB that is now free
 *
 *      Called to return a completed SCB to the allocation pool. Before
 *      calling the SCB must be out of use on both the host and the HA.
 */

static void orc_release_scb(struct orc_host *host, struct orc_scb *scb)
{
        unsigned long flags;
        u8 index, i, channel;

        spin_lock_irqsave(&(host->allocation_lock), flags);
        channel = host->index;  /* Channel */
        index = scb->scbidx;
        i = index / 32;
        index %= 32;
        host->allocation_map[channel][i] |= (1 << index);
        spin_unlock_irqrestore(&(host->allocation_lock), flags);
}

/*
 *      orchid_abort_scb        -       abort a command
 *
 *      Abort a queued command that has been passed to the firmware layer
 *      if possible. This is all handled by the firmware. We aks the firmware
 *      and it either aborts the command or fails
 */

static int orchid_abort_scb(struct orc_host * host, struct orc_scb * scb)
{
        unsigned char data, status;

        outb(ORC_CMD_ABORT_SCB, host->base + ORC_HDATA);        /* Write command */
        outb(HDO, host->base + ORC_HCTRL);
        if (wait_HDO_off(host) == 0)    /* Wait HDO off   */
                return 0;

        outb(scb->scbidx, host->base + ORC_HDATA);      /* Write address */
        outb(HDO, host->base + ORC_HCTRL);
        if (wait_HDO_off(host) == 0)    /* Wait HDO off   */
                return 0;

        if (wait_hdi_set(host, &data) == 0)     /* Wait HDI set   */
                return 0;
        status = inb(host->base + ORC_HDATA);
        outb(data, host->base + ORC_HSTUS);     /* Clear HDI    */

        if (status == 1)        /* 0 - Successfully               */
                return 0;       /* 1 - Fail                     */
        return 1;
}

static int inia100_abort_cmd(struct orc_host * host, struct scsi_cmnd *cmd)
{
        struct orc_extended_scb *escb;
        struct orc_scb *scb;
        u8 i;
        unsigned long flags;

        spin_lock_irqsave(&(host->allocation_lock), flags);

        scb = host->scb_virt;

        /* Walk the queue until we find the SCB that belongs to the command
           block. This isn't a performance critical path so a walk in the park
           here does no harm */

        for (i = 0; i < ORC_MAXQUEUE; i++, scb++) {
                escb = scb->escb;
                if (scb->status && escb->srb == cmd) {
                        if (scb->tag_msg == 0) {
                                goto out;
                        } else {
                                /* Issue an ABORT to the firmware */
                                if (orchid_abort_scb(host, scb)) {
                                        escb->srb = NULL;
                                        spin_unlock_irqrestore(&host->allocation_lock, flags);
                                        return SUCCESS;
                                } else
                                        goto out;
                        }
                }
        }
out:
        spin_unlock_irqrestore(&host->allocation_lock, flags);
        return FAILED;
}

/**
 *      orc_interrupt           -       IRQ processing
 *      @host: Host causing the interrupt
 *
 *      This function is called from the IRQ handler and protected
 *      by the host lock. While the controller reports that there are
 *      scb's for processing we pull them off the controller, turn the
 *      index into a host address pointer to the scb and call the scb
 *      handler.
 *
 *      Returns IRQ_HANDLED if any SCBs were processed, IRQ_NONE otherwise
 */

static irqreturn_t orc_interrupt(struct orc_host * host)
{
        u8 scb_index;
        struct orc_scb *scb;

        /* Check if we have an SCB queued for servicing */
        if (inb(host->base + ORC_RQUEUECNT) == 0)
                return IRQ_NONE;

        do {
                /* Get the SCB index of the SCB to service */
                scb_index = inb(host->base + ORC_RQUEUE);

                /* Translate it back to a host pointer */
                scb = (struct orc_scb *) ((unsigned long) host->scb_virt + (unsigned long) (sizeof(struct orc_scb) * scb_index));
                scb->status = 0x0;
                /* Process the SCB */
                inia100_scb_handler(host, scb);
        } while (inb(host->base + ORC_RQUEUECNT));
        return IRQ_HANDLED;
}                               /* End of I1060Interrupt() */

/**
 *      inia100_build_scb       -       build SCB
 *      @host: host owing the control block
 *      @scb: control block to use
 *      @cmd: Mid layer command
 *
 *      Build a host adapter control block from the SCSI mid layer command
 */

static int inia100_build_scb(struct orc_host * host, struct orc_scb * scb, struct scsi_cmnd * cmd)
{                               /* Create corresponding SCB     */
        struct scatterlist *sg;
        struct orc_sgent *sgent;                /* Pointer to SG list           */
        int i, count_sg;
        struct orc_extended_scb *escb;

        /* Links between the escb, scb and Linux scsi midlayer cmd */
        escb = scb->escb;
        escb->srb = cmd;
        sgent = NULL;

        /* Set up the SCB to do a SCSI command block */
        scb->opcode = ORC_EXECSCSI;
        scb->flags = SCF_NO_DCHK;       /* Clear done bit               */
        scb->target = cmd->device->id;
        scb->lun = cmd->device->lun;
        scb->reserved0 = 0;
        scb->reserved1 = 0;
        scb->sg_len = cpu_to_le32(0);

        scb->xferlen = cpu_to_le32((u32) scsi_bufflen(cmd));
        sgent = (struct orc_sgent *) & escb->sglist[0];

        count_sg = scsi_dma_map(cmd);
        if (count_sg < 0)
                return count_sg;
        BUG_ON(count_sg > TOTAL_SG_ENTRY);

        /* Build the scatter gather lists */
        if (count_sg) {
                scb->sg_len = cpu_to_le32((u32) (count_sg * 8));
                scsi_for_each_sg(cmd, sg, count_sg, i) {
                        sgent->base = cpu_to_le32((u32) sg_dma_address(sg));
                        sgent->length = cpu_to_le32((u32) sg_dma_len(sg));
                        sgent++;
                }
        } else {
                scb->sg_len = cpu_to_le32(0);
                sgent->base = cpu_to_le32(0);
                sgent->length = cpu_to_le32(0);
        }
        scb->sg_addr = (u32) scb->sense_addr;   /* sense_addr is already little endian */
        scb->hastat = 0;
        scb->tastat = 0;
        scb->link = 0xFF;
        scb->sense_len = SENSE_SIZE;
        scb->cdb_len = cmd->cmd_len;
        if (scb->cdb_len >= IMAX_CDB) {
                printk("max cdb length= %x\n", cmd->cmd_len);
                scb->cdb_len = IMAX_CDB;
        }
        scb->ident = (u8)(cmd->device->lun & 0xff) | DISC_ALLOW;
        if (cmd->device->tagged_supported) {    /* Tag Support                  */
                scb->tag_msg = SIMPLE_QUEUE_TAG;        /* Do simple tag only   */
        } else {
                scb->tag_msg = 0;       /* No tag support               */
        }
        memcpy(scb->cdb, cmd->cmnd, scb->cdb_len);
        return 0;
}

/**
 *      inia100_queue_lck               -       queue command with host
 *      @cmd: Command block
 *
 *      Called by the mid layer to queue a command. Process the command
 *      block, build the host specific scb structures and if there is room
 *      queue the command down to the controller
 */
static enum scsi_qc_status inia100_queue_lck(struct scsi_cmnd *cmd)
{
        struct orc_scb *scb;
        struct orc_host *host;          /* Point to Host adapter control block */

        host = (struct orc_host *) cmd->device->host->hostdata;
        /* Get free SCSI control block  */
        if ((scb = orc_alloc_scb(host)) == NULL)
                return SCSI_MLQUEUE_HOST_BUSY;

        if (inia100_build_scb(host, scb, cmd)) {
                orc_release_scb(host, scb);
                return SCSI_MLQUEUE_HOST_BUSY;
        }
        orc_exec_scb(host, scb);        /* Start execute SCB            */
        return 0;
}

static DEF_SCSI_QCMD(inia100_queue)

/*****************************************************************************
 Function name  : inia100_abort
 Description    : Abort a queued command.
                         (commands that are on the bus can't be aborted easily)
 Input          : host  -       Pointer to host adapter structure
 Output         : None.
 Return         : pSRB  -       Pointer to SCSI request block.
*****************************************************************************/
static int inia100_abort(struct scsi_cmnd * cmd)
{
        struct orc_host *host;

        host = (struct orc_host *) cmd->device->host->hostdata;
        return inia100_abort_cmd(host, cmd);
}

/*****************************************************************************
 Function name  : inia100_reset
 Description    : Reset registers, reset a hanging bus and
                  kill active and disconnected commands for target w/o soft reset
 Input          : host  -       Pointer to host adapter structure
 Output         : None.
 Return         : pSRB  -       Pointer to SCSI request block.
*****************************************************************************/
static int inia100_bus_reset(struct scsi_cmnd * cmd)
{                               /* I need Host Control Block Information */
        struct orc_host *host;
        host = (struct orc_host *) cmd->device->host->hostdata;
        return orc_reset_scsi_bus(host);
}

/*****************************************************************************
 Function name  : inia100_device_reset
 Description    : Reset the device
 Input          : host  -       Pointer to host adapter structure
 Output         : None.
 Return         : pSRB  -       Pointer to SCSI request block.
*****************************************************************************/
static int inia100_device_reset(struct scsi_cmnd * cmd)
{                               /* I need Host Control Block Information */
        struct orc_host *host;
        host = (struct orc_host *) cmd->device->host->hostdata;
        return orc_device_reset(host, cmd, scmd_id(cmd));

}

/**
 *      inia100_scb_handler     -       interrupt callback
 *      @host: Host causing the interrupt
 *      @scb: SCB the controller returned as needing processing
 *
 *      Perform completion processing on a control block. Do the conversions
 *      from host to SCSI midlayer error coding, save any sense data and
 *      the complete with the midlayer and recycle the scb.
 */

static void inia100_scb_handler(struct orc_host *host, struct orc_scb *scb)
{
        struct scsi_cmnd *cmd;  /* Pointer to SCSI request block */
        struct orc_extended_scb *escb;

        escb = scb->escb;
        if ((cmd = (struct scsi_cmnd *) escb->srb) == NULL) {
                printk(KERN_ERR "inia100_scb_handler: SRB pointer is empty\n");
                orc_release_scb(host, scb);     /* Release SCB for current channel */
                return;
        }
        escb->srb = NULL;

        switch (scb->hastat) {
        case 0x0:
        case 0xa:               /* Linked command complete without error and linked normally */
        case 0xb:               /* Linked command complete without error interrupt generated */
                scb->hastat = 0;
                break;

        case 0x11:              /* Selection time out-The initiator selection or target
                                   reselection was not complete within the SCSI Time out period */
                scb->hastat = DID_TIME_OUT;
                break;

        case 0x14:              /* Target bus phase sequence failure-An invalid bus phase or bus
                                   phase sequence was requested by the target. The host adapter
                                   will generate a SCSI Reset Condition, notifying the host with
                                   a SCRD interrupt */
                scb->hastat = DID_RESET;
                break;

        case 0x1a:              /* SCB Aborted. 07/21/98 */
                scb->hastat = DID_ABORT;
                break;

        case 0x12:              /* Data overrun/underrun-The target attempted to transfer more data
                                   than was allocated by the Data Length field or the sum of the
                                   Scatter / Gather Data Length fields. */
        case 0x13:              /* Unexpected bus free-The target dropped the SCSI BSY at an unexpected time. */
        case 0x16:              /* Invalid CCB Operation Code-The first byte of the CCB was invalid. */

        default:
                printk(KERN_DEBUG "inia100: %x %x\n", scb->hastat, scb->tastat);
                scb->hastat = DID_ERROR;        /* Couldn't find any better */
                break;
        }

        if (scb->tastat == 2) { /* Check condition              */
                memcpy((unsigned char *) &cmd->sense_buffer[0],
                   (unsigned char *) &escb->sglist[0], SENSE_SIZE);
        }
        cmd->result = scb->tastat | (scb->hastat << 16);
        scsi_dma_unmap(cmd);
        scsi_done(cmd);         /* Notify system DONE           */
        orc_release_scb(host, scb);     /* Release SCB for current channel */
}

/**
 *      inia100_intr            -       interrupt handler
 *      @irqno: Interrupt value
 *      @devid: Host adapter
 *
 *      Entry point for IRQ handling. All the real work is performed
 *      by orc_interrupt.
 */
static irqreturn_t inia100_intr(int irqno, void *devid)
{
        struct Scsi_Host *shost = (struct Scsi_Host *)devid;
        struct orc_host *host = (struct orc_host *)shost->hostdata;
        unsigned long flags;
        irqreturn_t res;

        spin_lock_irqsave(shost->host_lock, flags);
        res = orc_interrupt(host);
        spin_unlock_irqrestore(shost->host_lock, flags);

        return res;
}

static const struct scsi_host_template inia100_template = {
        .proc_name              = "inia100",
        .name                   = inia100_REVID,
        .queuecommand           = inia100_queue,
        .eh_abort_handler       = inia100_abort,
        .eh_bus_reset_handler   = inia100_bus_reset,
        .eh_device_reset_handler = inia100_device_reset,
        .can_queue              = 1,
        .this_id                = 1,
        .sg_tablesize           = SG_ALL,
};

static int inia100_probe_one(struct pci_dev *pdev,
                             const struct pci_device_id *id)
{
        struct Scsi_Host *shost;
        struct orc_host *host;
        unsigned long port, bios;
        int error = -ENODEV;
        u32 sz;

        if (pci_enable_device(pdev))
                goto out;
        if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
                printk(KERN_WARNING "Unable to set 32bit DMA "
                                    "on inia100 adapter, ignoring.\n");
                goto out_disable_device;
        }

        pci_set_master(pdev);

        port = pci_resource_start(pdev, 0);
        if (!request_region(port, 256, "inia100")) {
                printk(KERN_WARNING "inia100: io port 0x%lx, is busy.\n", port);
                goto out_disable_device;
        }

        /* <02> read from base address + 0x50 offset to get the bios value. */
        bios = inw(port + 0x50);


        shost = scsi_host_alloc(&inia100_template, sizeof(struct orc_host));
        if (!shost)
                goto out_release_region;

        host = (struct orc_host *)shost->hostdata;
        host->pdev = pdev;
        host->base = port;
        host->BIOScfg = bios;
        spin_lock_init(&host->allocation_lock);

        /* Get total memory needed for SCB */
        sz = ORC_MAXQUEUE * sizeof(struct orc_scb);
        host->scb_virt = dma_alloc_coherent(&pdev->dev, sz, &host->scb_phys,
                                            GFP_KERNEL);
        if (!host->scb_virt) {
                printk("inia100: SCB memory allocation error\n");
                goto out_host_put;
        }

        /* Get total memory needed for ESCB */
        sz = ORC_MAXQUEUE * sizeof(struct orc_extended_scb);
        host->escb_virt = dma_alloc_coherent(&pdev->dev, sz, &host->escb_phys,
                                             GFP_KERNEL);
        if (!host->escb_virt) {
                printk("inia100: ESCB memory allocation error\n");
                goto out_free_scb_array;
        }

        if (init_orchid(host)) {        /* Initialize orchid chip */
                printk("inia100: initial orchid fail!!\n");
                goto out_free_escb_array;
        }

        shost->io_port = host->base;
        shost->n_io_port = 0xff;
        shost->can_queue = ORC_MAXQUEUE;
        shost->unique_id = shost->io_port;
        shost->max_id = host->max_targets;
        shost->max_lun = 16;
        shost->irq = pdev->irq;
        shost->this_id = host->scsi_id; /* Assign HCS index */
        shost->sg_tablesize = TOTAL_SG_ENTRY;

        /* Initial orc chip           */
        error = request_irq(pdev->irq, inia100_intr, IRQF_SHARED,
                        "inia100", shost);
        if (error < 0) {
                printk(KERN_WARNING "inia100: unable to get irq %d\n",
                                pdev->irq);
                goto out_free_escb_array;
        }

        pci_set_drvdata(pdev, shost);

        error = scsi_add_host(shost, &pdev->dev);
        if (error)
                goto out_free_irq;

        scsi_scan_host(shost);
        return 0;

out_free_irq:
        free_irq(shost->irq, shost);
out_free_escb_array:
        dma_free_coherent(&pdev->dev,
                        ORC_MAXQUEUE * sizeof(struct orc_extended_scb),
                        host->escb_virt, host->escb_phys);
out_free_scb_array:
        dma_free_coherent(&pdev->dev,
                        ORC_MAXQUEUE * sizeof(struct orc_scb),
                        host->scb_virt, host->scb_phys);
out_host_put:
        scsi_host_put(shost);
out_release_region:
        release_region(port, 256);
out_disable_device:
        pci_disable_device(pdev);
out:
        return error;
}

static void inia100_remove_one(struct pci_dev *pdev)
{
        struct Scsi_Host *shost = pci_get_drvdata(pdev);
        struct orc_host *host = (struct orc_host *)shost->hostdata;

        scsi_remove_host(shost);

        free_irq(shost->irq, shost);
        dma_free_coherent(&pdev->dev,
                        ORC_MAXQUEUE * sizeof(struct orc_extended_scb),
                        host->escb_virt, host->escb_phys);
        dma_free_coherent(&pdev->dev,
                        ORC_MAXQUEUE * sizeof(struct orc_scb),
                        host->scb_virt, host->scb_phys);
        release_region(shost->io_port, 256);

        scsi_host_put(shost);
} 

static const struct pci_device_id inia100_pci_tbl[] = {
        {PCI_VENDOR_ID_INIT, 0x1060, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0,}
};
MODULE_DEVICE_TABLE(pci, inia100_pci_tbl);

static struct pci_driver inia100_pci_driver = {
        .name           = "inia100",
        .id_table       = inia100_pci_tbl,
        .probe          = inia100_probe_one,
        .remove         = inia100_remove_one,
};

module_pci_driver(inia100_pci_driver);

MODULE_DESCRIPTION("Initio A100U2W SCSI driver");
MODULE_AUTHOR("Initio Corporation");
MODULE_LICENSE("Dual BSD/GPL");