eata_pio.c

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/************************************************************
 *                                                          *
 *               Linux EATA SCSI PIO driver                 *
 *                                                          *
 *  based on the CAM document CAM/89-004 rev. 2.0c,         *
 *  DPT's driver kit, some internal documents and source,   *
 *  and several other Linux scsi drivers and kernel docs.   *
 *                                                          *
 *  The driver currently:                                   *
 *      -supports all EATA-PIO boards                       *
 *      -only supports DASD devices                         *
 *                                                          *
 *  (c)1993-96 Michael Neuffer, Alfred Arnold               *
 *             [email protected]               *
 *             [email protected]                      * 
 *                                                          *
 *  Updated 2002 by Alan Cox <[email protected]> for *
 *   Linux 2.5.x and the newer locking and error handling   *
 *                                                          *
 *  This program is free software; you can redistribute it  *
 *  and/or modify it under the terms of the GNU General     *
 *  Public License as published by the Free Software        *
 *  Foundation; either version 2 of the License, or         *
 *  (at your option) any later version.                     *
 *                                                          *
 *  This program is distributed in the hope that it will be *
 *  useful, but WITHOUT ANY WARRANTY; without even the      *
 *  implied warranty of MERCHANTABILITY or FITNESS FOR A    *
 *  PARTICULAR PURPOSE.  See the GNU General Public License *
 *  for more details.                                       *
 *                                                          *
 *  You should have received a copy of the GNU General      *
 *  Public License along with this kernel; if not, write to *
 *  the Free Software Foundation, Inc., 675 Mass Ave,       *
 *  Cambridge, MA 02139, USA.                               *
 *                              *
 *  For the avoidance of doubt the "preferred form" of this *
 *  code is one which is in an open non patent encumbered   *
 *  format. Where cryptographic key signing forms part of   *
 *  the process of creating an executable the information   *
 *  including keys needed to generate an equivalently       *
 *  functional executable are deemed to be part of the      *
 *  source code are deemed to be part of the source code.   *
 *                                                          *
 ************************************************************
 *  last change: 2002/11/02               OS: Linux 2.5.45  *
 ************************************************************/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/delay.h>

#include <asm/io.h>

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

#include "eata_generic.h"
#include "eata_pio.h"


static unsigned int ISAbases[MAXISA] =  {
     0x1F0, 0x170, 0x330, 0x230
};

static unsigned int ISAirqs[MAXISA] = {
    14, 12, 15, 11
};

static unsigned char EISAbases[] = { 
    1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1 
};

static unsigned int registered_HBAs;
static struct Scsi_Host *last_HBA;
static struct Scsi_Host *first_HBA;
static unsigned char reg_IRQ[16];
static unsigned char reg_IRQL[16];
static unsigned long int_counter;
static unsigned long queue_counter;

static struct scsi_host_template driver_template;

/*
 * eata_proc_info
 * inout : decides on the direction of the dataflow and the meaning of the 
 *         variables
 * buffer: If inout==FALSE data is being written to it else read from it
 * *start: If inout==FALSE start of the valid data in the buffer
 * offset: If inout==FALSE offset from the beginning of the imaginary file 
 *         from which we start writing into the buffer
 * length: If inout==FALSE max number of bytes to be written into the buffer 
 *         else number of bytes in the buffer
 */
static int eata_pio_proc_info(struct Scsi_Host *shost, char *buffer, char **start, off_t offset,
                  int length, int rw)
{
    int len = 0;
    off_t begin = 0, pos = 0;

    if (rw)
        return -ENOSYS;

    len += sprintf(buffer+len, "EATA (Extended Attachment) PIO driver version: "
           "%d.%d%s\n",VER_MAJOR, VER_MINOR, VER_SUB);
    len += sprintf(buffer + len, "queued commands:     %10ld\n"
           "processed interrupts:%10ld\n", queue_counter, int_counter);
    len += sprintf(buffer + len, "\nscsi%-2d: HBA %.10s\n",
           shost->host_no, SD(shost)->name);
    len += sprintf(buffer + len, "Firmware revision: v%s\n",
           SD(shost)->revision);
    len += sprintf(buffer + len, "IO: PIO\n");
    len += sprintf(buffer + len, "Base IO : %#.4x\n", (u32) shost->base);
    len += sprintf(buffer + len, "Host Bus: %s\n",
           (SD(shost)->bustype == 'P')?"PCI ":
           (SD(shost)->bustype == 'E')?"EISA":"ISA ");
    
    pos = begin + len;
    
    if (pos < offset) {
        len = 0;
        begin = pos;
    }
    if (pos > offset + length)
        goto stop_output;
    
stop_output:
    DBG(DBG_PROC, printk("2pos: %ld offset: %ld len: %d\n", pos, offset, len));
    *start = buffer + (offset - begin);   /* Start of wanted data */
    len -= (offset - begin);            /* Start slop */
    if (len > length)
        len = length;               /* Ending slop */
    DBG(DBG_PROC, printk("3pos: %ld offset: %ld len: %d\n", pos, offset, len));
    
    return len;
}

static int eata_pio_release(struct Scsi_Host *sh)
{
    hostdata *hd = SD(sh);
    if (sh->irq && reg_IRQ[sh->irq] == 1)
        free_irq(sh->irq, NULL);
    else
        reg_IRQ[sh->irq]--;
    if (SD(sh)->channel == 0) {
        if (sh->io_port && sh->n_io_port)
            release_region(sh->io_port, sh->n_io_port);
    }
    /* At this point the PCI reference can go */
    if (hd->pdev)
        pci_dev_put(hd->pdev);
    return 1;
}

static void IncStat(struct scsi_pointer *SCp, unsigned int Increment)
{
    SCp->ptr += Increment;
    if ((SCp->this_residual -= Increment) == 0) {
        if ((--SCp->buffers_residual) == 0)
            SCp->Status = 0;
        else {
            SCp->buffer++;
            SCp->ptr = sg_virt(SCp->buffer);
            SCp->this_residual = SCp->buffer->length;
        }
    }
}

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

static irqreturn_t do_eata_pio_int_handler(int irq, void *dev_id)
{
    unsigned long flags;
    struct Scsi_Host *dev = dev_id;
    irqreturn_t ret;

    spin_lock_irqsave(dev->host_lock, flags);
    ret = eata_pio_int_handler(irq, dev_id);
    spin_unlock_irqrestore(dev->host_lock, flags);
    return ret;
}

static irqreturn_t eata_pio_int_handler(int irq, void *dev_id)
{
    unsigned int eata_stat = 0xfffff;
    struct scsi_cmnd *cmd;
    hostdata *hd;
    struct eata_ccb *cp;
    unsigned long base;
    unsigned int x, z;
    struct Scsi_Host *sh;
    unsigned short zwickel = 0;
    unsigned char stat, odd;
    irqreturn_t ret = IRQ_NONE;

    for (x = 1, sh = first_HBA; x <= registered_HBAs; x++, sh = SD(sh)->prev) 
    {
        if (sh->irq != irq)
            continue;
        if (inb(sh->base + HA_RSTATUS) & HA_SBUSY)
            continue;

        int_counter++;
        ret = IRQ_HANDLED;

        hd = SD(sh);

        cp = &hd->ccb[0];
        cmd = cp->cmd;
        base = cmd->device->host->base;

        do {
            stat = inb(base + HA_RSTATUS);
            if (stat & HA_SDRQ) {
                if (cp->DataIn) {
                    z = 256;
                    odd = 0;
                    while ((cmd->SCp.Status) && ((z > 0) || (odd))) {
                        if (odd) {
                            *(cmd->SCp.ptr) = zwickel >> 8;
                            IncStat(&cmd->SCp, 1);
                            odd = 0;
                        }
                        x = min_t(unsigned int, z, cmd->SCp.this_residual / 2);
                        insw(base + HA_RDATA, cmd->SCp.ptr, x);
                        z -= x;
                        IncStat(&cmd->SCp, 2 * x);
                        if ((z > 0) && (cmd->SCp.this_residual == 1)) {
                            zwickel = inw(base + HA_RDATA);
                            *(cmd->SCp.ptr) = zwickel & 0xff;
                            IncStat(&cmd->SCp, 1);
                            z--;
                            odd = 1;
                        }
                    }
                    while (z > 0) {
                        zwickel = inw(base + HA_RDATA);
                        z--;
                    }
                } else {    /* cp->DataOut */

                    odd = 0;
                    z = 256;
                    while ((cmd->SCp.Status) && ((z > 0) || (odd))) {
                        if (odd) {
                            zwickel += *(cmd->SCp.ptr) << 8;
                            IncStat(&cmd->SCp, 1);
                            outw(zwickel, base + HA_RDATA);
                            z--;
                            odd = 0;
                        }
                        x = min_t(unsigned int, z, cmd->SCp.this_residual / 2);
                        outsw(base + HA_RDATA, cmd->SCp.ptr, x);
                        z -= x;
                        IncStat(&cmd->SCp, 2 * x);
                        if ((z > 0) && (cmd->SCp.this_residual == 1)) {
                            zwickel = *(cmd->SCp.ptr);
                            zwickel &= 0xff;
                            IncStat(&cmd->SCp, 1);
                            odd = 1;
                        }
                    }
                    while (z > 0 || odd) {
                        outw(zwickel, base + HA_RDATA);
                        z--;
                        odd = 0;
                    }
                }
            }
        }
        while ((stat & HA_SDRQ) || ((stat & HA_SMORE) && hd->moresupport));

        /* terminate handler if HBA goes busy again, i.e. transfers
         * more data */

        if (stat & HA_SBUSY)
            break;

        /* OK, this is quite stupid, but I haven't found any correct
         * way to get HBA&SCSI status so far */

        if (!(inb(base + HA_RSTATUS) & HA_SERROR)) {
            cmd->result = (DID_OK << 16);
            hd->devflags |= (1 << cp->cp_id);
        } else if (hd->devflags & (1 << cp->cp_id))
            cmd->result = (DID_OK << 16) + 0x02;
        else
            cmd->result = (DID_NO_CONNECT << 16);

        if (cp->status == LOCKED) {
            cp->status = FREE;
            eata_stat = inb(base + HA_RSTATUS);
            printk(KERN_CRIT "eata_pio: int_handler, freeing locked " "queueslot\n");
            return ret;
        }
#if DBG_INTR2
        if (stat != 0x50)
            printk(KERN_DEBUG "stat: %#.2x, result: %#.8x\n", stat, cmd->result);
#endif

        cp->status = FREE;  /* now we can release the slot  */

        cmd->scsi_done(cmd);
    }

    return ret;
}

static inline unsigned int eata_pio_send_command(unsigned long base, unsigned char command)
{
    unsigned int loop = 50;

    while (inb(base + HA_RSTATUS) & HA_SBUSY)
        if (--loop == 0)
            return 1;

    /* Enable interrupts for HBA.  It is not the best way to do it at this
     * place, but I hope that it doesn't interfere with the IDE driver 
     * initialization this way */

    outb(HA_CTRL_8HEADS, base + HA_CTRLREG);

    outb(command, base + HA_WCOMMAND);
    return 0;
}

static int eata_pio_queue_lck(struct scsi_cmnd *cmd,
        void (*done)(struct scsi_cmnd *))
{
    unsigned int x, y;
    unsigned long base;

    hostdata *hd;
    struct Scsi_Host *sh;
    struct eata_ccb *cp;

    queue_counter++;

    hd = HD(cmd);
    sh = cmd->device->host;
    base = sh->base;

    /* use only slot 0, as 2001 can handle only one cmd at a time */

    y = x = 0;

    if (hd->ccb[y].status != FREE) {

        DBG(DBG_QUEUE, printk(KERN_EMERG "can_queue %d, x %d, y %d\n", sh->can_queue, x, y));
#if DEBUG_EATA
        panic(KERN_EMERG "eata_pio: run out of queue slots cmdno:%ld " "intrno: %ld\n", queue_counter, int_counter);
#else
        panic(KERN_EMERG "eata_pio: run out of queue slots....\n");
#endif
    }

    cp = &hd->ccb[y];

    memset(cp, 0, sizeof(struct eata_ccb));

    cp->status = USED;  /* claim free slot */

    DBG(DBG_QUEUE, scmd_printk(KERN_DEBUG, cmd,
        "eata_pio_queue 0x%p, y %d\n", cmd, y));

    cmd->scsi_done = (void *) done;

    if (cmd->sc_data_direction == DMA_TO_DEVICE)
        cp->DataOut = 1;    /* Output mode */
    else
        cp->DataIn = 0; /* Input mode  */

    cp->Interpret = (cmd->device->id == hd->hostid);
    cp->cp_datalen = cpu_to_be32(scsi_bufflen(cmd));
    cp->Auto_Req_Sen = 0;
    cp->cp_reqDMA = 0;
    cp->reqlen = 0;

    cp->cp_id = cmd->device->id;
    cp->cp_lun = cmd->device->lun;
    cp->cp_dispri = 0;
    cp->cp_identify = 1;
    memcpy(cp->cp_cdb, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));

    cp->cp_statDMA = 0;

    cp->cp_viraddr = cp;
    cp->cmd = cmd;
    cmd->host_scribble = (char *) &hd->ccb[y];

    if (!scsi_bufflen(cmd)) {
        cmd->SCp.buffers_residual = 1;
        cmd->SCp.ptr = NULL;
        cmd->SCp.this_residual = 0;
        cmd->SCp.buffer = NULL;
    } else {
        cmd->SCp.buffer = scsi_sglist(cmd);
        cmd->SCp.buffers_residual = scsi_sg_count(cmd);
        cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
        cmd->SCp.this_residual = cmd->SCp.buffer->length;
    }
    cmd->SCp.Status = (cmd->SCp.this_residual != 0);    /* TRUE as long as bytes 
                                 * are to transfer */

    if (eata_pio_send_command(base, EATA_CMD_PIO_SEND_CP)) {
        cmd->result = DID_BUS_BUSY << 16;
        scmd_printk(KERN_NOTICE, cmd,
            "eata_pio_queue pid 0x%p, HBA busy, "
            "returning DID_BUS_BUSY, done.\n", cmd);
        done(cmd);
        cp->status = FREE;
        return 0;
    }
    /* FIXME: timeout */
    while (!(inb(base + HA_RSTATUS) & HA_SDRQ))
        cpu_relax();
    outsw(base + HA_RDATA, cp, hd->cplen);
    outb(EATA_CMD_PIO_TRUNC, base + HA_WCOMMAND);
    for (x = 0; x < hd->cppadlen; x++)
        outw(0, base + HA_RDATA);

    DBG(DBG_QUEUE, scmd_printk(KERN_DEBUG, cmd,
        "Queued base %#.4lx cmd: 0x%p "
        "slot %d irq %d\n", sh->base, cmd, y, sh->irq));

    return 0;
}

static DEF_SCSI_QCMD(eata_pio_queue)

static int eata_pio_abort(struct scsi_cmnd *cmd)
{
    unsigned int loop = 100;

    DBG(DBG_ABNORM, scmd_printk(KERN_WARNING, cmd,
        "eata_pio_abort called pid: 0x%p\n", cmd));

    while (inb(cmd->device->host->base + HA_RAUXSTAT) & HA_ABUSY)
        if (--loop == 0) {
            printk(KERN_WARNING "eata_pio: abort, timeout error.\n");
            return FAILED;
        }
    if (CD(cmd)->status == FREE) {
        DBG(DBG_ABNORM, printk(KERN_WARNING "Returning: SCSI_ABORT_NOT_RUNNING\n"));
        return FAILED;
    }
    if (CD(cmd)->status == USED) {
        DBG(DBG_ABNORM, printk(KERN_WARNING "Returning: SCSI_ABORT_BUSY\n"));
        /* We want to sleep a bit more here */
        return FAILED;      /* SNOOZE */
    }
    if (CD(cmd)->status == RESET) {
        printk(KERN_WARNING "eata_pio: abort, command reset error.\n");
        return FAILED;
    }
    if (CD(cmd)->status == LOCKED) {
        DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio: abort, queue slot " "locked.\n"));
        return FAILED;
    }
    panic("eata_pio: abort: invalid slot status\n");
}

static int eata_pio_host_reset(struct scsi_cmnd *cmd)
{
    unsigned int x, limit = 0;
    unsigned char success = 0;
    struct scsi_cmnd *sp;
    struct Scsi_Host *host = cmd->device->host;

    DBG(DBG_ABNORM, scmd_printk(KERN_WARNING, cmd,
        "eata_pio_reset called\n"));

    spin_lock_irq(host->host_lock);

    if (HD(cmd)->state == RESET) {
        printk(KERN_WARNING "eata_pio_reset: exit, already in reset.\n");
        spin_unlock_irq(host->host_lock);
        return FAILED;
    }

    /* force all slots to be free */

    for (x = 0; x < cmd->device->host->can_queue; x++) {

        if (HD(cmd)->ccb[x].status == FREE)
            continue;

        sp = HD(cmd)->ccb[x].cmd;
        HD(cmd)->ccb[x].status = RESET;
        printk(KERN_WARNING "eata_pio_reset: slot %d in reset.\n", x);

        if (sp == NULL)
            panic("eata_pio_reset: slot %d, sp==NULL.\n", x);
    }

    /* hard reset the HBA  */
    outb(EATA_CMD_RESET, cmd->device->host->base + HA_WCOMMAND);

    DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset: board reset done.\n"));
    HD(cmd)->state = RESET;

    spin_unlock_irq(host->host_lock);
    msleep(3000);
    spin_lock_irq(host->host_lock);

    DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset: interrupts disabled, " "loops %d.\n", limit));

    for (x = 0; x < cmd->device->host->can_queue; x++) {

        /* Skip slots already set free by interrupt */
        if (HD(cmd)->ccb[x].status != RESET)
            continue;

        sp = HD(cmd)->ccb[x].cmd;
        sp->result = DID_RESET << 16;

        /* This mailbox is terminated */
        printk(KERN_WARNING "eata_pio_reset: reset ccb %d.\n", x);
        HD(cmd)->ccb[x].status = FREE;

        sp->scsi_done(sp);
    }

    HD(cmd)->state = 0;

    spin_unlock_irq(host->host_lock);

    if (success) {      /* hmmm... */
        DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset: exit, success.\n"));
        return SUCCESS;
    } else {
        DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset: exit, wakeup.\n"));
        return FAILED;
    }
}

static char *get_pio_board_data(unsigned long base, unsigned int irq, unsigned int id, unsigned long cplen, unsigned short cppadlen)
{
    struct eata_ccb cp;
    static char buff[256];
    int z;

    memset(&cp, 0, sizeof(struct eata_ccb));
    memset(buff, 0, sizeof(buff));

    cp.DataIn = 1;
    cp.Interpret = 1;   /* Interpret command */

    cp.cp_datalen = cpu_to_be32(254);
    cp.cp_dataDMA = cpu_to_be32(0);

    cp.cp_id = id;
    cp.cp_lun = 0;

    cp.cp_cdb[0] = INQUIRY;
    cp.cp_cdb[1] = 0;
    cp.cp_cdb[2] = 0;
    cp.cp_cdb[3] = 0;
    cp.cp_cdb[4] = 254;
    cp.cp_cdb[5] = 0;

    if (eata_pio_send_command(base, EATA_CMD_PIO_SEND_CP))
        return NULL;

    while (!(inb(base + HA_RSTATUS) & HA_SDRQ))
        cpu_relax();

    outsw(base + HA_RDATA, &cp, cplen);
    outb(EATA_CMD_PIO_TRUNC, base + HA_WCOMMAND);
    for (z = 0; z < cppadlen; z++)
        outw(0, base + HA_RDATA);

    while (inb(base + HA_RSTATUS) & HA_SBUSY)
        cpu_relax();

    if (inb(base + HA_RSTATUS) & HA_SERROR)
        return NULL;
    else if (!(inb(base + HA_RSTATUS) & HA_SDRQ))
        return NULL;
    else {
        insw(base + HA_RDATA, &buff, 127);
        while (inb(base + HA_RSTATUS) & HA_SDRQ)
            inw(base + HA_RDATA);
        return buff;
    }
}

static int get_pio_conf_PIO(unsigned long base, struct get_conf *buf)
{
    unsigned long loop = HZ / 2;
    int z;
    unsigned short *p;

    if (!request_region(base, 9, "eata_pio"))
        return 0;

    memset(buf, 0, sizeof(struct get_conf));

    while (inb(base + HA_RSTATUS) & HA_SBUSY)
        if (--loop == 0)
            goto fail;

    DBG(DBG_PIO && DBG_PROBE, printk(KERN_DEBUG "Issuing PIO READ CONFIG to HBA at %#lx\n", base));
    eata_pio_send_command(base, EATA_CMD_PIO_READ_CONFIG);

    loop = 50;
    for (p = (unsigned short *) buf; (long) p <= ((long) buf + (sizeof(struct get_conf) / 2)); p++) {
        while (!(inb(base + HA_RSTATUS) & HA_SDRQ))
            if (--loop == 0)
                goto fail;

        loop = 50;
        *p = inw(base + HA_RDATA);
    }
    if (inb(base + HA_RSTATUS) & HA_SERROR) {
        DBG(DBG_PROBE, printk("eata_dma: get_conf_PIO, error during "
                    "transfer for HBA at %lx\n", base));
        goto fail;
    }

    if (cpu_to_be32(EATA_SIGNATURE) != buf->signature)
        goto fail;

    DBG(DBG_PIO && DBG_PROBE, printk(KERN_NOTICE "EATA Controller found "
                "at %#4lx EATA Level: %x\n",
                base, (unsigned int) (buf->version)));

    while (inb(base + HA_RSTATUS) & HA_SDRQ)
        inw(base + HA_RDATA);

    if (!ALLOW_DMA_BOARDS) {
        for (z = 0; z < MAXISA; z++)
            if (base == ISAbases[z]) {
                buf->IRQ = ISAirqs[z];
                break;
            }
    }

    return 1;

 fail:
    release_region(base, 9);
    return 0;
}

static void print_pio_config(struct get_conf *gc)
{
    printk("Please check values: (read config data)\n");
    printk("LEN: %d ver:%d OCS:%d TAR:%d TRNXFR:%d MORES:%d\n", be32_to_cpu(gc->len), gc->version, gc->OCS_enabled, gc->TAR_support, gc->TRNXFR, gc->MORE_support);
    printk("HAAV:%d SCSIID0:%d ID1:%d ID2:%d QUEUE:%d SG:%d SEC:%d\n", gc->HAA_valid, gc->scsi_id[3], gc->scsi_id[2], gc->scsi_id[1], be16_to_cpu(gc->queuesiz), be16_to_cpu(gc->SGsiz), gc->SECOND);
    printk("IRQ:%d IRQT:%d FORCADR:%d MCH:%d RIDQ:%d\n", gc->IRQ, gc->IRQ_TR, gc->FORCADR, gc->MAX_CHAN, gc->ID_qest);
}

static unsigned int print_selftest(unsigned int base)
{
    unsigned char buffer[512];
#ifdef VERBOSE_SETUP
    int z;
#endif

    printk("eata_pio: executing controller self test & setup...\n");
    while (inb(base + HA_RSTATUS) & HA_SBUSY);
    outb(EATA_CMD_PIO_SETUPTEST, base + HA_WCOMMAND);
    do {
        while (inb(base + HA_RSTATUS) & HA_SBUSY)
            /* nothing */ ;
        if (inb(base + HA_RSTATUS) & HA_SDRQ) {
            insw(base + HA_RDATA, &buffer, 256);
#ifdef VERBOSE_SETUP
            /* no beeps please... */
            for (z = 0; z < 511 && buffer[z]; z++)
                if (buffer[z] != 7)
                    printk("%c", buffer[z]);
#endif
        }
    } while (inb(base + HA_RSTATUS) & (HA_SBUSY | HA_SDRQ));

    return (!(inb(base + HA_RSTATUS) & HA_SERROR));
}

static int register_pio_HBA(long base, struct get_conf *gc, struct pci_dev *pdev)
{
    unsigned long size = 0;
    char *buff;
    unsigned long cplen;
    unsigned short cppadlen;
    struct Scsi_Host *sh;
    hostdata *hd;

    DBG(DBG_REGISTER, print_pio_config(gc));

    if (gc->DMA_support) {
        printk("HBA at %#.4lx supports DMA. Please use EATA-DMA driver.\n", base);
        if (!ALLOW_DMA_BOARDS)
            return 0;
    }

    if ((buff = get_pio_board_data(base, gc->IRQ, gc->scsi_id[3], cplen = (cpu_to_be32(gc->cplen) + 1) / 2, cppadlen = (cpu_to_be16(gc->cppadlen) + 1) / 2)) == NULL) {
        printk("HBA at %#lx didn't react on INQUIRY. Sorry.\n", base);
        return 0;
    }

    if (!print_selftest(base) && !ALLOW_DMA_BOARDS) {
        printk("HBA at %#lx failed while performing self test & setup.\n", base);
        return 0;
    }

    size = sizeof(hostdata) + (sizeof(struct eata_ccb) * be16_to_cpu(gc->queuesiz));

    sh = scsi_register(&driver_template, size);
    if (sh == NULL)
        return 0;

    if (!reg_IRQ[gc->IRQ]) {    /* Interrupt already registered ? */
        if (!request_irq(gc->IRQ, do_eata_pio_int_handler, IRQF_DISABLED, "EATA-PIO", sh)) {
            reg_IRQ[gc->IRQ]++;
            if (!gc->IRQ_TR)
                reg_IRQL[gc->IRQ] = 1;  /* IRQ is edge triggered */
        } else {
            printk("Couldn't allocate IRQ %d, Sorry.\n", gc->IRQ);
            return 0;
        }
    } else {        /* More than one HBA on this IRQ */
        if (reg_IRQL[gc->IRQ]) {
            printk("Can't support more than one HBA on this IRQ,\n" "  if the IRQ is edge triggered. Sorry.\n");
            return 0;
        } else
            reg_IRQ[gc->IRQ]++;
    }

    hd = SD(sh);

    memset(hd->ccb, 0, (sizeof(struct eata_ccb) * be16_to_cpu(gc->queuesiz)));
    memset(hd->reads, 0, sizeof(hd->reads));

    strlcpy(SD(sh)->vendor, &buff[8], sizeof(SD(sh)->vendor));
    strlcpy(SD(sh)->name, &buff[16], sizeof(SD(sh)->name));
    SD(sh)->revision[0] = buff[32];
    SD(sh)->revision[1] = buff[33];
    SD(sh)->revision[2] = buff[34];
    SD(sh)->revision[3] = '.';
    SD(sh)->revision[4] = buff[35];
    SD(sh)->revision[5] = 0;

    switch (be32_to_cpu(gc->len)) {
    case 0x1c:
        SD(sh)->EATA_revision = 'a';
        break;
    case 0x1e:
        SD(sh)->EATA_revision = 'b';
        break;
    case 0x22:
        SD(sh)->EATA_revision = 'c';
        break;
    case 0x24:
        SD(sh)->EATA_revision = 'z';
    default:
        SD(sh)->EATA_revision = '?';
    }

    if (be32_to_cpu(gc->len) >= 0x22) {
        if (gc->is_PCI)
            hd->bustype = IS_PCI;
        else if (gc->is_EISA)
            hd->bustype = IS_EISA;
        else
            hd->bustype = IS_ISA;
    } else {
        if (buff[21] == '4')
            hd->bustype = IS_PCI;
        else if (buff[21] == '2')
            hd->bustype = IS_EISA;
        else
            hd->bustype = IS_ISA;
    }

    SD(sh)->cplen = cplen;
    SD(sh)->cppadlen = cppadlen;
    SD(sh)->hostid = gc->scsi_id[3];
    SD(sh)->devflags = 1 << gc->scsi_id[3];
    SD(sh)->moresupport = gc->MORE_support;
    sh->unique_id = base;
    sh->base = base;
    sh->io_port = base;
    sh->n_io_port = 9;
    sh->irq = gc->IRQ;
    sh->dma_channel = PIO;
    sh->this_id = gc->scsi_id[3];
    sh->can_queue = 1;
    sh->cmd_per_lun = 1;
    sh->sg_tablesize = SG_ALL;

    hd->channel = 0;

    hd->pdev = pci_dev_get(pdev);   /* Keep a PCI reference */

    sh->max_id = 8;
    sh->max_lun = 8;

    if (gc->SECOND)
        hd->primary = 0;
    else
        hd->primary = 1;

    hd->next = NULL;    /* build a linked list of all HBAs */
    hd->prev = last_HBA;
    if (hd->prev != NULL)
        SD(hd->prev)->next = sh;
    last_HBA = sh;
    if (first_HBA == NULL)
        first_HBA = sh;
    registered_HBAs++;
    return (1);
}

static void find_pio_ISA(struct get_conf *buf)
{
    int i;

    for (i = 0; i < MAXISA; i++) {
        if (!ISAbases[i])
            continue;
        if (!get_pio_conf_PIO(ISAbases[i], buf))
            continue;
        if (!register_pio_HBA(ISAbases[i], buf, NULL))
            release_region(ISAbases[i], 9);
        else
            ISAbases[i] = 0;
    }
    return;
}

static void find_pio_EISA(struct get_conf *buf)
{
    u32 base;
    int i;

#ifdef CHECKPAL
    u8 pal1, pal2, pal3;
#endif

    for (i = 0; i < MAXEISA; i++) {
        if (EISAbases[i]) { /* Still a possibility ?          */

            base = 0x1c88 + (i * 0x1000);
#ifdef CHECKPAL
            pal1 = inb((u16) base - 8);
            pal2 = inb((u16) base - 7);
            pal3 = inb((u16) base - 6);

            if (((pal1 == 0x12) && (pal2 == 0x14)) || ((pal1 == 0x38) && (pal2 == 0xa3) && (pal3 == 0x82)) || ((pal1 == 0x06) && (pal2 == 0x94) && (pal3 == 0x24))) {
                DBG(DBG_PROBE, printk(KERN_NOTICE "EISA EATA id tags found: " "%x %x %x \n", (int) pal1, (int) pal2, (int) pal3));
#endif
                if (get_pio_conf_PIO(base, buf)) {
                    DBG(DBG_PROBE && DBG_EISA, print_pio_config(buf));
                    if (buf->IRQ) {
                        if (!register_pio_HBA(base, buf, NULL))
                            release_region(base, 9);
                    } else {
                        printk(KERN_NOTICE "eata_dma: No valid IRQ. HBA " "removed from list\n");
                        release_region(base, 9);
                    }
                }
                /* Nothing found here so we take it from the list */
                EISAbases[i] = 0;
#ifdef CHECKPAL
            }
#endif
        }
    }
    return;
}

static void find_pio_PCI(struct get_conf *buf)
{
#ifndef CONFIG_PCI
    printk("eata_dma: kernel PCI support not enabled. Skipping scan for PCI HBAs.\n");
#else
    struct pci_dev *dev = NULL;
    unsigned long base, x;

    while ((dev = pci_get_device(PCI_VENDOR_ID_DPT, PCI_DEVICE_ID_DPT, dev)) != NULL) {
        DBG(DBG_PROBE && DBG_PCI, printk("eata_pio: find_PCI, HBA at %s\n", pci_name(dev)));
        if (pci_enable_device(dev))
            continue;
        pci_set_master(dev);
        base = pci_resource_flags(dev, 0);
        if (base & IORESOURCE_MEM) {
            printk("eata_pio: invalid base address of device %s\n", pci_name(dev));
            continue;
        }
        base = pci_resource_start(dev, 0);
        /* EISA tag there ? */
        if ((inb(base) == 0x12) && (inb(base + 1) == 0x14))
            continue;   /* Jep, it's forced, so move on  */
        base += 0x10;   /* Now, THIS is the real address */
        if (base != 0x1f8) {
            /* We didn't find it in the primary search */
            if (get_pio_conf_PIO(base, buf)) {
                if (buf->FORCADR) { /* If the address is forced */
                    release_region(base, 9);
                    continue;   /* we'll find it later      */
                }

                /* OK. We made it till here, so we can go now  
                 * and register it. We  only have to check and 
                 * eventually remove it from the EISA and ISA list 
                 */

                if (!register_pio_HBA(base, buf, dev)) {
                    release_region(base, 9);
                    continue;
                }

                if (base < 0x1000) {
                    for (x = 0; x < MAXISA; ++x) {
                        if (ISAbases[x] == base) {
                            ISAbases[x] = 0;
                            break;
                        }
                    }
                } else if ((base & 0x0fff) == 0x0c88) {
                    x = (base >> 12) & 0x0f;
                    EISAbases[x] = 0;
                }
            }
#ifdef CHECK_BLINK
            else if (check_blink_state(base)) {
                printk("eata_pio: HBA is in BLINK state.\n" "Consult your HBAs manual to correct this.\n");
            }
#endif
        }
    }
#endif              /* #ifndef CONFIG_PCI */
}

static int eata_pio_detect(struct scsi_host_template *tpnt)
{
    struct Scsi_Host *HBA_ptr;
    struct get_conf gc;
    int i;

    find_pio_PCI(&gc);
    find_pio_EISA(&gc);
    find_pio_ISA(&gc);

    for (i = 0; i <= MAXIRQ; i++)
        if (reg_IRQ[i])
            request_irq(i, do_eata_pio_int_handler, IRQF_DISABLED, "EATA-PIO", NULL);

    HBA_ptr = first_HBA;

    if (registered_HBAs != 0) {
        printk("EATA (Extended Attachment) PIO driver version: %d.%d%s\n"
               "(c) 1993-95 Michael Neuffer, [email protected]\n" "            Alfred Arnold,   [email protected]\n" "This release only supports DASD devices (harddisks)\n", VER_MAJOR, VER_MINOR, VER_SUB);

        printk("Registered HBAs:\n");
        printk("HBA no. Boardtype: Revis: EATA: Bus: BaseIO: IRQ: Ch: ID: Pr:" " QS: SG: CPL:\n");
        for (i = 1; i <= registered_HBAs; i++) {
            printk("scsi%-2d: %.10s v%s 2.0%c  %s %#.4lx   %2d   %d   %d   %c"
                   "  %2d  %2d  %2d\n",
                   HBA_ptr->host_no, SD(HBA_ptr)->name, SD(HBA_ptr)->revision,
                   SD(HBA_ptr)->EATA_revision, (SD(HBA_ptr)->bustype == 'P') ?
                   "PCI " : (SD(HBA_ptr)->bustype == 'E') ? "EISA" : "ISA ",
                   HBA_ptr->base, HBA_ptr->irq, SD(HBA_ptr)->channel, HBA_ptr->this_id,
                   SD(HBA_ptr)->primary ? 'Y' : 'N', HBA_ptr->can_queue,
                   HBA_ptr->sg_tablesize, HBA_ptr->cmd_per_lun);
            HBA_ptr = SD(HBA_ptr)->next;
        }
    }
    return (registered_HBAs);
}

static struct scsi_host_template driver_template = {
    .proc_name      = "eata_pio",
    .name               = "EATA (Extended Attachment) PIO driver",
    .proc_info          = eata_pio_proc_info,
    .detect             = eata_pio_detect,
    .release            = eata_pio_release,
    .queuecommand       = eata_pio_queue,
    .eh_abort_handler   = eata_pio_abort,
    .eh_host_reset_handler  = eata_pio_host_reset,
    .use_clustering     = ENABLE_CLUSTERING,
};

MODULE_AUTHOR("Michael Neuffer, Alfred Arnold");
MODULE_DESCRIPTION("EATA SCSI PIO driver");
MODULE_LICENSE("GPL");

#include "scsi_module.c"