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eata_pio.c

/************************************************************
 *                                                          *
 *               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               *
 *             neuffer@goofy.zdv.uni-mainz.de               *
 *             a.arnold@kfa-juelich.de                      * 
 *                                                          *
 *  Updated 2002 by Alan Cox <alan@redhat.com> 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/slab.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(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));
      memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));

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

      DBG(DBG_QUEUE, scmd_printk(KERN_DEBUG, cmd,
            "eata_pio_queue pid %ld, y %d\n",
            cmd->serial_number, 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(cmd->request_bufflen);
      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 (cmd->use_sg == 0) {
            cmd->SCp.buffers_residual = 1;
            cmd->SCp.ptr = cmd->request_buffer;
            cmd->SCp.this_residual = cmd->request_bufflen;
            cmd->SCp.buffer = NULL;
      } else {
            cmd->SCp.buffer = cmd->request_buffer;
            cmd->SCp.buffers_residual = cmd->use_sg;
            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 %ld, HBA busy, "
                  "returning DID_BUS_BUSY, done.\n", cmd->serial_number);
            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 pid: %ld "
            "slot %d irq %d\n", sh->base, cmd->serial_number, y, sh->irq));

      return 0;
}

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: %ld\n",
            cmd->serial_number));

      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 pid:%ld\n",
            cmd->serial_number));

      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, pid %ld.\n", x, sp->serial_number);

            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;

      sh->unchecked_isa_dma = 0;    /* We can only do PIO */

      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, neuffer@goofy.zdv.uni-mainz.de\n" "            Alfred Arnold,   a.arnold@kfa-juelich.de\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"

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