Subversion Repositories or1k

/*===================================================================
 *
 *                    Linux MegaRAID device driver
 *
 * Copyright 1998 American Megatrends Inc.
 *
 *              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.
 *
 * Version : 0.93
 * 
 * Description: Linux device driver for AMI MegaRAID controller
 *
 * Supported controllers: MegaRAID 418, 428, 438, 466
 * 
 * Maintainer: Jeff L Jones <jeffreyj@ami.com>
 *
 * History:
 *
 * Version 0.90:
 *     Original source contributed by Dell; integrated it into the kernel and
 *     cleaned up some things.  Added support for 438/466 controllers.
 *
 * Version 0.91:
 *     Aligned mailbox area on 16-byte boundry.
 *     Added schedule() at the end to properly clean up.
 *     Made improvements for conformity to linux driver standards.
 *
 * Version 0.92:
 *     Added support for 2.1 kernels.
 *         Reads from pci_dev struct, so it's not dependent on pcibios.
 *         Added some missing virt_to_bus() translations.
 *     Added support for SMP.
 *         Changed global cli()'s to spinlocks for 2.1, and simulated
 *          spinlocks for 2.0.
 *     Removed setting of SA_INTERRUPT flag when requesting Irq.
 *
 * Version 0.92ac:
 *      Small changes to the comments/formatting. Plus a couple of
 *      added notes. Returned to the authors. No actual code changes
 *      save printk levels.
 *      8 Oct 98        Alan Cox <alan.cox@linux.org>
 *
 *     Merged with 2.1.131 source tree.
 *     12 Dec 98       K. Baranowski <kgb@knm.org.pl>                          
 *
 * Version 0.93:
 *     Added support for vendor specific ioctl commands (0x80+xxh)
 *     Changed some fields in MEGARAID struct to better values.
 *     Added signature check for Rp controllers under 2.0 kernels
 *     Changed busy-wait loop to be time-based
 *     Fixed SMP race condition in isr
 *     Added kfree (sgList) on release
 *     Added #include linux/version.h to megaraid.h for hosts.h
 *     Changed max_id to represent max logical drives instead of targets.
 *
 *
 * BUGS:
 *     Some older 2.1 kernels (eg. 2.1.90) have a bug in pci.c that
 *     fails to detect the controller as a pci device on the system.
 *
 *===================================================================*/
 
#define CRLFSTR "\n"
 
#include <linux/config.h>
#include <linux/version.h>
 
#ifdef MODULE
#include <linux/module.h>
 
#if LINUX_VERSION_CODE >= 0x20100
char kernel_version[] = UTS_RELEASE;
 
MODULE_AUTHOR ("American Megatrends Inc.");
MODULE_DESCRIPTION ("AMI MegaRAID driver");
#endif
#endif
 
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/malloc.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/blk.h>
#include <linux/wait.h>
#include <linux/tqueue.h>
#include <linux/interrupt.h>
 
#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/malloc.h>	/* for kmalloc() */
#include <linux/config.h>	/* for CONFIG_PCI */
#if LINUX_VERSION_CODE < 0x20100
#include <linux/bios32.h>
#else
#include <asm/spinlock.h>
#endif
 
#include <asm/io.h>
#include <asm/irq.h>
 
#include "sd.h"
#include "scsi.h"
#include "hosts.h"
 
#include "megaraid.h"
 
//================================================================
//
//                          #Defines
//
//================================================================
 
#if LINUX_VERSION_CODE < 0x020100
#define ioremap vremap
#define iounmap vfree
 
/* simulate spin locks */
typedef struct {
  volatile char lock;
} spinlock_t;
 
#define spin_lock_init(x) { (x)->lock = 0;}
#define spin_lock_irqsave(x,flags) { while ((x)->lock) barrier();\
                                        (x)->lock=1; save_flags(flags);\
                                        cli();}
#define spin_unlock_irqrestore(x,flags) { (x)->lock=0; restore_flags(flags);}
 
#endif
 
#if LINUX_VERSION_CODE >= 0x020100
#define queue_task_irq(a,b)     queue_task(a,b)
#define queue_task_irq_off(a,b) queue_task(a,b)
#endif
 
#define MAX_SERBUF 160
#define COM_BASE 0x2f8
 
#define ENQUEUE(obj,type,list,next) \
{ type **node; long cpuflag; \
  spin_lock_irqsave(&mega_lock,cpuflag);\
  for(node=&(list); *node; node=(type **)&(*node)->##next); \
  (*node) = obj; \
  (*node)->##next = NULL; \
  spin_unlock_irqrestore(&mega_lock,cpuflag);\
};
 
#define DEQUEUE(obj,type,list,next) \
{ long cpuflag; \
  spin_lock_irqsave(&mega_lock,cpuflag);\
  if ((obj=list) != NULL) {\
    list = (type *)(list)->##next; \
  } \
  spin_unlock_irqrestore(&mega_lock,cpuflag);\
};
 
u_long RDINDOOR (mega_host_config * megaCfg)
{
  return readl (megaCfg->base + 0x20);
}
 
void WRINDOOR (mega_host_config * megaCfg, u_long value)
{
  writel (value, megaCfg->base + 0x20);
}
 
u_long RDOUTDOOR (mega_host_config * megaCfg)
{
  return readl (megaCfg->base + 0x2C);
}
 
void WROUTDOOR (mega_host_config * megaCfg, u_long value)
{
  writel (value, megaCfg->base + 0x2C);
}
 
//================================================================
//
//                    Function prototypes
//
//================================================================
static int MegaIssueCmd (mega_host_config * megaCfg,
			 u_char * mboxData,
			 mega_scb * scb,
			 int intr);
static int build_sglist (mega_host_config * megaCfg, mega_scb * scb,
			 u_long * buffer, u_long * length);
 
static void mega_runque (void *);
static void mega_rundoneq (void);
static void mega_cmd_done (mega_host_config *, mega_scb *, int);
static mega_scb *mega_ioctl (mega_host_config * megaCfg, Scsi_Cmnd * SCpnt);
 
/* set SERDEBUG to 1 to enable serial debugging */
#define SERDEBUG 0
#if SERDEBUG
static void ser_init (void);
static void ser_puts (char *str);
static void ser_putc (char c);
static int ser_printk (const char *fmt,...);
#endif
 
//================================================================
//
//                    Global variables
//
//================================================================
static int numCtlrs = 0;
static mega_host_config *megaCtlrs[12] = {0};
 
/* Change this to 0 if you want to see the raw drives */
static int use_raid = 1;
 
/* Queue of pending/completed SCBs */
static mega_scb *qPending = NULL;
static Scsi_Cmnd *qCompleted = NULL;
 
volatile static spinlock_t mega_lock;
static struct tq_struct runq = {0, 0, mega_runque, NULL};
 
struct proc_dir_entry proc_scsi_megaraid =
{
  PROC_SCSI_MEGARAID, 8, "megaraid",
  S_IFDIR | S_IRUGO | S_IXUGO, 2
};
 
#if SERDEBUG
static char strbuf[MAX_SERBUF + 1];
 
static void ser_init ()
{
  unsigned port = COM_BASE;
 
  outb (0x80, port + 3);
  outb (0, port + 1);
  /* 9600 Baud, if 19200: outb(6,port) */
  outb (12, port);
  outb (3, port + 3);
  outb (0, port + 1);
}
 
static void ser_puts (char *str)
{
  char *ptr;
 
  ser_init ();
  for (ptr = str; *ptr; ++ptr)
    ser_putc (*ptr);
}
 
static void ser_putc (char c)
{
  unsigned port = COM_BASE;
 
  while ((inb (port + 5) & 0x20) == 0);
  outb (c, port);
  if (c == 0x0a) {
    while ((inb (port + 5) & 0x20) == 0);
    outb (0x0d, port);
  }
}
 
static int ser_printk (const char *fmt,...)
{
  va_list args;
  int i;
  long flags;
 
  va_start (args, fmt);
  i = vsprintf (strbuf, fmt, args);
  ser_puts (strbuf);
  va_end (args);
 
  return i;
}
 
#define TRACE(a)    { ser_printk a;}
 
#else
#define TRACE(A)
#endif
 
void callDone (Scsi_Cmnd * SCpnt)
{
  if (SCpnt->result) {
    TRACE (("*** %.08lx %.02x <%d.%d.%d> = %x\n", SCpnt->serial_number,
	    SCpnt->cmnd[0], SCpnt->channel, SCpnt->target, SCpnt->lun,
	    SCpnt->result));
  }
  SCpnt->scsi_done (SCpnt);
}
 
/*-------------------------------------------------------------------------
 *
 *                      Local functions
 *
 *-------------------------------------------------------------------------*/
 
//================================================
// Initialize SCB structures
//================================================
static void initSCB (mega_host_config * megaCfg)
{
  int idx;
 
  for (idx = 0; idx < megaCfg->max_cmds; idx++) {
    megaCfg->scbList[idx].idx = -1;
    megaCfg->scbList[idx].flag = 0;
    megaCfg->scbList[idx].sgList = NULL;
    megaCfg->scbList[idx].SCpnt = NULL;
  }
}
 
//===========================
// Allocate a SCB structure
//===========================
static mega_scb * allocateSCB (mega_host_config * megaCfg, Scsi_Cmnd * SCpnt)
{
  int idx;
  long flags;
 
  spin_lock_irqsave (&mega_lock, flags);
  for (idx = 0; idx < megaCfg->max_cmds; idx++) {
    if (megaCfg->scbList[idx].idx < 0) {
 
      /* Set Index and SCB pointer */
      megaCfg->scbList[idx].flag = 0;
      megaCfg->scbList[idx].idx = idx;
      megaCfg->scbList[idx].SCpnt = SCpnt;
      megaCfg->scbList[idx].next = NULL;
      spin_unlock_irqrestore (&mega_lock, flags);
 
      if (megaCfg->scbList[idx].sgList == NULL) {
	megaCfg->scbList[idx].sgList =
	  kmalloc (sizeof (mega_sglist) * MAX_SGLIST, GFP_ATOMIC | GFP_DMA);
      }
 
      return &megaCfg->scbList[idx];
    }
  }
  spin_unlock_irqrestore (&mega_lock, flags);
 
  printk (KERN_WARNING "Megaraid: Could not allocate free SCB!!!\n");
 
  return NULL;
}
 
//=======================
// Free a SCB structure
//=======================
static void freeSCB (mega_scb * scb)
{
  scb->flag = 0;
  scb->idx = -1;
  scb->next = NULL;
  scb->SCpnt = NULL;
}
 
/* Run through the list of completed requests */
static void mega_rundoneq ()
{
  mega_host_config *megaCfg;
  Scsi_Cmnd *SCpnt;
  long islogical;
 
  while (1) {
    DEQUEUE (SCpnt, Scsi_Cmnd, qCompleted, host_scribble);
    if (SCpnt == NULL)
      return;
 
    megaCfg = (mega_host_config *) SCpnt->host->hostdata;
 
    /* Check if we're allowing access to RAID drives or physical
     *  if use_raid == 1 and this wasn't a disk on the max channel or
     *  if use_raid == 0 and this was a disk on the max channel
     *  then fail.
     */
    islogical = (SCpnt->channel == megaCfg->host->max_channel) ? 1 : 0;
    if (SCpnt->cmnd[0] == INQUIRY &&
	((((u_char *) SCpnt->request_buffer)[0] & 0x1F) == TYPE_DISK) &&
	(islogical != use_raid)) {
      SCpnt->result = 0xF0;
    }
 
    /* Convert result to error */
    switch (SCpnt->result) {
    case 0x00:
    case 0x02:
      SCpnt->result |= (DID_OK << 16);
      break;
    case 0x8:
      SCpnt->result |= (DID_BUS_BUSY << 16);
      break;
    default:
      SCpnt->result |= (DID_BAD_TARGET << 16);
      break;
    }
 
    /* Callback */
    callDone (SCpnt);
  }
}
 
/* Add command to the list of completed requests */
static void mega_cmd_done (mega_host_config * megaCfg, mega_scb * pScb, int status)
{
  long flags;
 
  pScb->SCpnt->result = status;
  ENQUEUE (pScb->SCpnt, Scsi_Cmnd, qCompleted, host_scribble);
  spin_lock_irqsave (&mega_lock, flags);
  freeSCB (pScb);
  spin_unlock_irqrestore (&mega_lock, flags);
}
 
/*----------------------------------------------------
 * Process pending queue list
 *
 * Run as a scheduled task 
 *----------------------------------------------------*/
static void mega_runque (void *dummy)
{
  mega_host_config *megaCfg;
  mega_scb *pScb;
  long flags;
 
  /* Take care of any completed requests */
  mega_rundoneq ();
 
  DEQUEUE (pScb, mega_scb, qPending, next);
 
  if (pScb) {
    megaCfg = (mega_host_config *) pScb->SCpnt->host->hostdata;
 
    if (megaCfg->mbox->busy || megaCfg->flag & (IN_ISR | PENDING)) {
      TRACE (("%.08lx %.02x <%d.%d.%d> busy%d isr%d pending%d\n",
	      pScb->SCpnt->serial_number,
	      pScb->SCpnt->cmnd[0],
	      pScb->SCpnt->channel,
	      pScb->SCpnt->target,
	      pScb->SCpnt->lun,
	      megaCfg->mbox->busy,
	      (megaCfg->flag & IN_ISR) ? 1 : 0,
	      (megaCfg->flag & PENDING) ? 1 : 0));
    }
 
    if (MegaIssueCmd (megaCfg, pScb->mboxData, pScb, 1)) {
      /* We're BUSY... come back later */
      spin_lock_irqsave (&mega_lock, flags);
      pScb->next = qPending;
      qPending = pScb;
      spin_unlock_irqrestore (&mega_lock, flags);
 
      if (!(megaCfg->flag & PENDING)) {
	/* If PENDING, irq will schedule task */
	queue_task (&runq, &tq_scheduler);
      }
    }
  }
}
 
/*-------------------------------------------------------------------
 *
 *                 Build a SCB from a Scsi_Cmnd
 *
 * Returns a SCB pointer, or NULL
 * If NULL is returned, the scsi_done function MUST have been called
 *
 *-------------------------------------------------------------------*/
static mega_scb * mega_build_cmd (mega_host_config * megaCfg, Scsi_Cmnd * SCpnt)
{
  mega_scb *pScb;
  mega_mailbox *mbox;
  mega_passthru *pthru;
  long seg;
 
  if (SCpnt->cmnd[0] & 0x80)	/* ioctl from megamgr */
    return mega_ioctl (megaCfg, SCpnt);
 
  /* We don't support multi-luns */
  if (SCpnt->lun != 0) {
    SCpnt->result = (DID_BAD_TARGET << 16);
    callDone (SCpnt);
    return NULL;
  }
 
  /*-----------------------------------------------------
   *
   *               Logical drive commands
   *
   *-----------------------------------------------------*/
  if (SCpnt->channel == megaCfg->host->max_channel) {
    switch (SCpnt->cmnd[0]) {
    case TEST_UNIT_READY:
      memset (SCpnt->request_buffer, 0, SCpnt->request_bufflen);
      SCpnt->result = (DID_OK << 16);
      callDone (SCpnt);
      return NULL;
 
    case MODE_SENSE:
      memset (SCpnt->request_buffer, 0, SCpnt->cmnd[4]);
      SCpnt->result = (DID_OK << 16);
      callDone (SCpnt);
      return NULL;
 
    case READ_CAPACITY:
    case INQUIRY:
      /* Allocate a SCB and initialize passthru */
      if ((pScb = allocateSCB (megaCfg, SCpnt)) == NULL) {
	SCpnt->result = (DID_ERROR << 16);
	callDone (SCpnt);
	return NULL;
      }
      pthru = &pScb->pthru;
      mbox = (mega_mailbox *) & pScb->mboxData;
 
      memset (mbox, 0, sizeof (pScb->mboxData));
      memset (pthru, 0, sizeof (mega_passthru));
      pthru->timeout = 0;
      pthru->ars = 0;
      pthru->islogical = 1;
      pthru->logdrv = SCpnt->target;
      pthru->cdblen = SCpnt->cmd_len;
      pthru->dataxferaddr = virt_to_bus (SCpnt->request_buffer);
      pthru->dataxferlen = SCpnt->request_bufflen;
      memcpy (pthru->cdb, SCpnt->cmnd, SCpnt->cmd_len);
 
      /* Initialize mailbox area */
      mbox->cmd = MEGA_MBOXCMD_PASSTHRU;
      mbox->xferaddr = virt_to_bus (pthru);
 
      return pScb;
 
    case READ_6:
    case WRITE_6:
    case READ_10:
    case WRITE_10:
      /* Allocate a SCB and initialize mailbox */
      if ((pScb = allocateSCB (megaCfg, SCpnt)) == NULL) {
	SCpnt->result = (DID_ERROR << 16);
	callDone (SCpnt);
	return NULL;
      }
      mbox = (mega_mailbox *) & pScb->mboxData;
 
      memset (mbox, 0, sizeof (pScb->mboxData));
      mbox->logdrv = SCpnt->target;
      mbox->cmd = (*SCpnt->cmnd == READ_6 || *SCpnt->cmnd == READ_10) ?
	MEGA_MBOXCMD_LREAD : MEGA_MBOXCMD_LWRITE;
 
      /* 6-byte */
      if (*SCpnt->cmnd == READ_6 || *SCpnt->cmnd == WRITE_6) {
	mbox->numsectors =
	  (u_long) SCpnt->cmnd[4];
	mbox->lba =
	  ((u_long) SCpnt->cmnd[1] << 16) |
	  ((u_long) SCpnt->cmnd[2] << 8) |
	  (u_long) SCpnt->cmnd[3];
	mbox->lba &= 0x1FFFFF;
      }
 
      /* 10-byte */
      if (*SCpnt->cmnd == READ_10 || *SCpnt->cmnd == WRITE_10) {
	mbox->numsectors =
	  (u_long) SCpnt->cmnd[8] |
	  ((u_long) SCpnt->cmnd[7] << 8);
	mbox->lba =
	  ((u_long) SCpnt->cmnd[2] << 24) |
	  ((u_long) SCpnt->cmnd[3] << 16) |
	  ((u_long) SCpnt->cmnd[4] << 8) |
	  (u_long) SCpnt->cmnd[5];
      }
 
      /* Calculate Scatter-Gather info */
      mbox->numsgelements = build_sglist (megaCfg, pScb,
					  (u_long *) & mbox->xferaddr,
					  (u_long *) & seg);
 
      return pScb;
 
    default:
      SCpnt->result = (DID_BAD_TARGET << 16);
      callDone (SCpnt);
      return NULL;
    }
  }
  /*-----------------------------------------------------
   *
   *               Passthru drive commands
   *
   *-----------------------------------------------------*/
  else {
    /* Allocate a SCB and initialize passthru */
    if ((pScb = allocateSCB (megaCfg, SCpnt)) == NULL) {
      SCpnt->result = (DID_ERROR << 16);
      callDone (SCpnt);
      return NULL;
    }
    pthru = &pScb->pthru;
    mbox = (mega_mailbox *) pScb->mboxData;
 
    memset (mbox, 0, sizeof (pScb->mboxData));
    memset (pthru, 0, sizeof (mega_passthru));
    pthru->timeout = 0;
    pthru->ars = 0;
    pthru->islogical = 0;
    pthru->channel = SCpnt->channel;
    pthru->target = SCpnt->target;
    pthru->cdblen = SCpnt->cmd_len;
    memcpy (pthru->cdb, SCpnt->cmnd, SCpnt->cmd_len);
 
    pthru->numsgelements = build_sglist (megaCfg, pScb,
					 (u_long *) & pthru->dataxferaddr,
					 (u_long *) & pthru->dataxferlen);
 
    /* Initialize mailbox */
    mbox->cmd = MEGA_MBOXCMD_PASSTHRU;
    mbox->xferaddr = virt_to_bus (pthru);
 
    return pScb;
  }
  return NULL;
}
 
/*--------------------------------------------------------------------
 * build RAID commands for controller, passed down through ioctl()
 *--------------------------------------------------------------------*/
static mega_scb * mega_ioctl (mega_host_config * megaCfg, Scsi_Cmnd * SCpnt)
{
  mega_scb *pScb;
  mega_ioctl_mbox *mbox;
  mega_mailbox *mailbox;
  mega_passthru *pthru;
  long seg;
 
  if ((pScb = allocateSCB (megaCfg, SCpnt)) == NULL) {
    SCpnt->result = (DID_ERROR << 16);
    callDone (SCpnt);
    return NULL;
  }
 
  mbox = (mega_ioctl_mbox *) & pScb->mboxData;
  mailbox = (mega_mailbox *) & pScb->mboxData;
  memset (mailbox, 0, sizeof (pScb->mboxData));
 
  if (SCpnt->cmnd[0] == 0x83) {	/* passthrough command */
    char cdblen = SCpnt->cmnd[2];
 
    pthru = &pScb->pthru;
    memset (pthru, 0, sizeof (mega_passthru));
    pthru->islogical = SCpnt->cmnd[cdblen + 3] & 0x80;
    pthru->timeout = SCpnt->cmnd[cdblen + 3] & 0x07;
    pthru->reqsenselen = 10;	/* ? MAX_SENSE; */
    pthru->ars = SCpnt->cmnd[cdblen + 3] & 0x08;
    pthru->logdrv = SCpnt->cmnd[cdblen + 4];
    pthru->channel = SCpnt->cmnd[cdblen + 5];
    pthru->target = SCpnt->cmnd[cdblen + 6];
    pthru->cdblen = cdblen;
    memcpy (pthru->cdb, SCpnt->cmnd, SCpnt->cmnd[2]);
 
    mailbox->cmd = MEGA_MBOXCMD_PASSTHRU;
    mailbox->xferaddr = virt_to_bus (pthru);
 
    pthru->numsgelements = build_sglist (megaCfg, pScb,
					 (u_long *) & pthru->dataxferaddr,
					 (u_long *) & pthru->dataxferlen);
 
    return pScb;
  }
  /* else normal (nonpassthru) command */
 
  mbox->cmd = SCpnt->cmnd[0] & 0x7F;
  mbox->channel = SCpnt->cmnd[1];
  mbox->param = SCpnt->cmnd[2];
  mbox->pad[0] = SCpnt->cmnd[3];
  mbox->logdrv = SCpnt->cmnd[4];
 
  mbox->numsgelements = build_sglist (megaCfg, pScb,
				      (u_long *) & mbox->xferaddr,
				      (u_long *) & seg);
 
  return (pScb);
}
 
 
/*--------------------------------------------------------------------
 * Interrupt service routine
 *--------------------------------------------------------------------*/
static void megaraid_isr (int irq, void *devp, struct pt_regs *regs)
{
  mega_host_config    *megaCfg;
  u_char byte, idx, sIdx;
  u_long dword;
  mega_mailbox *mbox;
  mega_scb *pScb;
  long flags;
  int qCnt, qStatus;
 
  megaCfg = (mega_host_config *) devp;
  mbox = (mega_mailbox *) megaCfg->mbox;
 
  if (megaCfg->host->irq == irq) {
 
#if LINUX_VERSION_CODE >= 0x20100
    spin_lock_irqsave (&io_request_lock, flags);
#endif
 
    spin_lock_irqsave (&mega_lock, flags);
 
    if (megaCfg->flag & IN_ISR) {
      TRACE (("ISR called reentrantly!!\n"));
    }
 
    megaCfg->flag |= IN_ISR;
 
    /* Check if a valid interrupt is pending */
    if (megaCfg->flag & BOARD_QUARTZ) {
      dword = RDOUTDOOR (megaCfg);
      if (dword != 0x10001234) {
	/* Spurious interrupt */
	megaCfg->flag &= ~IN_ISR;
	spin_unlock_irqrestore (&mega_lock, flags);
#if LINUX_VERSION_CODE >= 0x20100
        spin_unlock_irqrestore (&io_request_lock, flags);
#endif
	return;
      }
      WROUTDOOR (megaCfg, dword);
    }
    else {
      byte = READ_PORT (megaCfg->host->io_port, INTR_PORT);
      if ((byte & VALID_INTR_BYTE) == 0) {
	/* Spurious interrupt */
	megaCfg->flag &= ~IN_ISR;
	spin_unlock_irqrestore (&mega_lock, flags);
#if LINUX_VERSION_CODE >= 0x20100
        spin_unlock_irqrestore (&io_request_lock, flags);
#endif
	return;
      }
      WRITE_PORT (megaCfg->host->io_port, INTR_PORT, byte);
    }
 
    qCnt = mbox->numstatus;
    qStatus = mbox->status;
 
    if (qCnt > 1) {
      TRACE (("ISR: Received %d status\n", qCnt))
	printk (KERN_DEBUG "Got numstatus = %d\n", qCnt);
    }
 
    for (idx = 0; idx < qCnt; idx++) {
      sIdx = mbox->completed[idx];
      if (sIdx > 0) {
	pScb = &megaCfg->scbList[sIdx - 1];
	spin_unlock_irqrestore (&mega_lock, flags); /* megalock within cmd_done */
	mega_cmd_done (megaCfg, &megaCfg->scbList[sIdx - 1], qStatus);
	spin_lock_irqsave (&mega_lock, flags);
      }
    }
    if (megaCfg->flag & BOARD_QUARTZ) {
      WRINDOOR (megaCfg, virt_to_bus (megaCfg->mbox) | 0x2);
      while (RDINDOOR (megaCfg) & 0x02);
    }
    else {
      CLEAR_INTR (megaCfg->host->io_port);
    }
 
    megaCfg->flag &= ~IN_ISR;
    megaCfg->flag &= ~PENDING;
 
    spin_unlock_irqrestore (&mega_lock, flags);
    mega_runque (NULL);
 
#if LINUX_VERSION_CODE >= 0x20100
    spin_unlock_irqrestore (&io_request_lock, flags);
#endif
 
#if 0
    /* Queue as a delayed ISR routine */
    queue_task_irq_off (&runq, &tq_immediate);
    mark_bh (IMMEDIATE_BH);
#endif
 
  }
}
 
/*==================================================*/
/* Wait until the controller's mailbox is available */
/*==================================================*/
static int busyWaitMbox (mega_host_config * megaCfg)
{
  mega_mailbox *mbox = (mega_mailbox *) megaCfg->mbox;
  long counter;
 
  for (counter = 0; counter < 30000; counter++) {
    udelay (100);
    if (!mbox->busy)
      return 0;
  }
  return -1;			/* give up after 3 seconds */
}
 
//=====================================================
// Post a command to the card
//
// Arguments:
//   mega_host_config *megaCfg - Controller structure
//   u_char *mboxData - Mailbox area, 16 bytes
//   mega_scb *pScb   - SCB posting (or NULL if N/A)
//   int intr         - if 1, interrupt, 0 is blocking
//=====================================================
static int MegaIssueCmd (mega_host_config * megaCfg,
	      u_char * mboxData,
	      mega_scb * pScb,
	      int intr)
{
  mega_mailbox *mbox = (mega_mailbox *) megaCfg->mbox;
  long flags;
  u_char byte;
  u_long cmdDone;
 
  mboxData[0x1] = (pScb ? pScb->idx + 1 : 0x00);	/* Set cmdid */
  mboxData[0xF] = 1;		/* Set busy */
 
  spin_lock_irqsave(&mega_lock,flags);
 
  /* one bad report of problem when issuing a command while pending.
   * Wasn't able to duplicate, but it doesn't really affect performance
   * anyway, so don't allow command while PENDING
   */
 
  if (megaCfg->flag & PENDING) {
    spin_unlock_irqrestore(&mega_lock,flags);
    return -1;
  }
 
  /* Wait until mailbox is free */
  if (busyWaitMbox (megaCfg)) {
    if (pScb) {
      TRACE (("Mailbox busy %.08lx <%d.%d.%d>\n", pScb->SCpnt->serial_number,
	      pScb->SCpnt->channel, pScb->SCpnt->target, pScb->SCpnt->lun));
    } else {
	TRACE(("pScb NULL in MegaIssueCmd!\n"));
    }
    spin_unlock_irqrestore(&mega_lock,flags);
    return -1;
  }
 
  /* Copy mailbox data into host structure */
  memset (mbox, 0, sizeof (mega_mailbox));
  memcpy (mbox, mboxData, 16);
 
  /* Kick IO */
  megaCfg->flag |= PENDING;
  if (intr) {
    /* Issue interrupt (non-blocking) command */
    if (megaCfg->flag & BOARD_QUARTZ) {
      mbox->mraid_poll = 0;
      mbox->mraid_ack = 0;
      WRINDOOR (megaCfg, virt_to_bus (megaCfg->mbox) | 0x1);
    }
    else {
      ENABLE_INTR (megaCfg->host->io_port);
      ISSUE_COMMAND (megaCfg->host->io_port);
    }
    spin_unlock_irqrestore(&mega_lock,flags);
  }
  else {			/* Issue non-ISR (blocking) command */
 
    if (megaCfg->flag & BOARD_QUARTZ) {
 
      mbox->mraid_poll = 0;
      mbox->mraid_ack = 0;
      WRINDOOR (megaCfg, virt_to_bus (megaCfg->mbox) | 0x1);
 
      while ((cmdDone = RDOUTDOOR (megaCfg)) != 0x10001234);
      WROUTDOOR (megaCfg, cmdDone);
 
      spin_unlock_irqrestore(&mega_lock,flags);
      if (pScb) {
	mega_cmd_done (megaCfg, pScb, mbox->status);
	mega_rundoneq ();
      }
 
      WRINDOOR (megaCfg, virt_to_bus (megaCfg->mbox) | 0x2);
      while (RDINDOOR (megaCfg) & 0x2);
 
      megaCfg->flag &= ~PENDING;
 
    }
    else {
      DISABLE_INTR (megaCfg->host->io_port);
      ISSUE_COMMAND (megaCfg->host->io_port);
 
      while (!((byte = READ_PORT (megaCfg->host->io_port, INTR_PORT)) & INTR_VALID));
      WRITE_PORT (megaCfg->host->io_port, INTR_PORT, byte);
 
 
      ENABLE_INTR (megaCfg->host->io_port);
      CLEAR_INTR (megaCfg->host->io_port);
      megaCfg->flag &= ~PENDING;
      spin_unlock_irqrestore(&mega_lock,flags);
 
      if (pScb) {
	mega_cmd_done (megaCfg, pScb, mbox->status);
	mega_rundoneq ();
      }
      else {
	TRACE (("Error: NULL pScb!\n"));
      }
 
    }
  }
 
  return 0;
}
 
/*-------------------------------------------------------------------
 * Copies data to SGLIST
 *-------------------------------------------------------------------*/
static int build_sglist (mega_host_config * megaCfg, mega_scb * scb,
	      u_long * buffer, u_long * length)
{
  struct scatterlist *sgList;
  int idx;
 
  /* Scatter-gather not used */
  if (scb->SCpnt->use_sg == 0) {
    *buffer = virt_to_bus (scb->SCpnt->request_buffer);
    *length = (u_long) scb->SCpnt->request_bufflen;
    return 0;
  }
 
  sgList = (struct scatterlist *) scb->SCpnt->buffer;
  if (scb->SCpnt->use_sg == 1) {
    *buffer = virt_to_bus (sgList[0].address);
    *length = (u_long) sgList[0].length;
    return 0;
  }
 
  /* Copy Scatter-Gather list info into controller structure */
  for (idx = 0; idx < scb->SCpnt->use_sg; idx++) {
    scb->sgList[idx].address = virt_to_bus (sgList[idx].address);
    scb->sgList[idx].length = (u_long) sgList[idx].length;
  }
 
  /* Reset pointer and length fields */
  *buffer = virt_to_bus (scb->sgList);
  *length = 0;
 
  /* Return count of SG requests */
  return scb->SCpnt->use_sg;
}
 
/*--------------------------------------------------------------------
 * Initializes the adress of the controller's mailbox register
 *  The mailbox register is used to issue commands to the card.
 *  Format of the mailbox area:
 *   00 01 command
 *   01 01 command id
 *   02 02 # of sectors
 *   04 04 logical bus address
 *   08 04 physical buffer address
 *   0C 01 logical drive #
 *   0D 01 length of scatter/gather list
 *   0E 01 reserved
 *   0F 01 mailbox busy
 *   10 01 numstatus byte
 *   11 01 status byte
 *--------------------------------------------------------------------*/
static int mega_register_mailbox (mega_host_config * megaCfg, u_long paddr)
{
  /* align on 16-byte boundry */
  megaCfg->mbox = &megaCfg->mailbox;
  megaCfg->mbox = (mega_mailbox *) ((((ulong) megaCfg->mbox) + 16) & 0xfffffff0);
  paddr = (paddr + 16) & 0xfffffff0;
 
  /* Register mailbox area with the firmware */
  if (megaCfg->flag & BOARD_QUARTZ) {
  }
  else {
    WRITE_PORT (megaCfg->host->io_port, MBOX_PORT0, paddr & 0xFF);
    WRITE_PORT (megaCfg->host->io_port, MBOX_PORT1, (paddr >> 8) & 0xFF);
    WRITE_PORT (megaCfg->host->io_port, MBOX_PORT2, (paddr >> 16) & 0xFF);
    WRITE_PORT (megaCfg->host->io_port, MBOX_PORT3, (paddr >> 24) & 0xFF);
    WRITE_PORT (megaCfg->host->io_port, ENABLE_MBOX_REGION, ENABLE_MBOX_BYTE);
 
    CLEAR_INTR (megaCfg->host->io_port);
    ENABLE_INTR (megaCfg->host->io_port);
  }
  return 0;
}
 
/*-------------------------------------------------------------------
 * Issue an adapter info query to the controller
 *-------------------------------------------------------------------*/
static int mega_i_query_adapter (mega_host_config * megaCfg)
{
  mega_RAIDINQ *adapterInfo;
  mega_mailbox *mbox;
  u_char mboxData[16];
  u_long paddr;
 
  spin_lock_init (&mega_lock);
  /* Initialize adapter inquiry */
  paddr = virt_to_bus (megaCfg->mega_buffer);
  mbox = (mega_mailbox *) mboxData;
 
  memset ((void *) megaCfg->mega_buffer, 0, sizeof (megaCfg->mega_buffer));
  memset (mbox, 0, 16);
 
  /* Initialize mailbox registers */
  mbox->cmd = MEGA_MBOXCMD_ADAPTERINQ;
  mbox->xferaddr = paddr;
 
  /* Issue a blocking command to the card */
  MegaIssueCmd (megaCfg, mboxData, NULL, 0);
 
  /* Initialize host/local structures with Adapter info */
  adapterInfo = (mega_RAIDINQ *) megaCfg->mega_buffer;
  megaCfg->host->max_channel = adapterInfo->AdpInfo.ChanPresent;
/*  megaCfg->host->max_id = adapterInfo->AdpInfo.MaxTargPerChan; */
  megaCfg->host->max_id = 9; /* max logical drives + 1 */
  megaCfg->numldrv = adapterInfo->LogdrvInfo.NumLDrv;
 
#if 0
  printk ("KERN_DEBUG ---- Logical drive info ----\n");
  for (i = 0; i < megaCfg->numldrv; i++) {
    printk ("%d: size: %ld prop: %x state: %x\n", i,
	    adapterInfo->LogdrvInfo.LDrvSize[i],
	    adapterInfo->LogdrvInfo.LDrvProp[i],
	    adapterInfo->LogdrvInfo.LDrvState[i]);
  }
  printk (KERN_DEBUG "---- Physical drive info ----\n");
  for (i = 0; i < MAX_PHYSICAL_DRIVES; i++) {
    if (i && !(i % 8))
      printk ("\n");
    printk ("%d: %x   ", i, adapterInfo->PhysdrvInfo.PDrvState[i]);
  }
  printk ("\n");
#endif
 
  megaCfg->max_cmds = adapterInfo->AdpInfo.MaxConcCmds;
 
#ifdef HP			/* use HP firmware and bios version encoding */
  sprintf (megaCfg->fwVer, "%c%d%d.%d%d",
	   adapterInfo->AdpInfo.FwVer[2],
	   adapterInfo->AdpInfo.FwVer[1] >> 8,
	   adapterInfo->AdpInfo.FwVer[1] & 0x0f,
	   adapterInfo->AdpInfo.FwVer[2] >> 8,
	   adapterInfo->AdpInfo.FwVer[2] & 0x0f);
  sprintf (megaCfg->biosVer, "%c%d%d.%d%d",
	   adapterInfo->AdpInfo.BiosVer[2],
	   adapterInfo->AdpInfo.BiosVer[1] >> 8,
	   adapterInfo->AdpInfo.BiosVer[1] & 0x0f,
	   adapterInfo->AdpInfo.BiosVer[2] >> 8,
	   adapterInfo->AdpInfo.BiosVer[2] & 0x0f);
#else
  memcpy (megaCfg->fwVer, adapterInfo->AdpInfo.FwVer, 4);
  megaCfg->fwVer[4] = 0;
 
  memcpy (megaCfg->biosVer, adapterInfo->AdpInfo.BiosVer, 4);
  megaCfg->biosVer[4] = 0;
#endif
 
  printk (KERN_INFO "megaraid: [%s:%s] detected %d logical drives" CRLFSTR,
	  megaCfg->fwVer,
	  megaCfg->biosVer,
	  megaCfg->numldrv);
  return 0;
}
 
/*-------------------------------------------------------------------------
 *
 *                      Driver interface functions
 *
 *-------------------------------------------------------------------------*/
 
/*----------------------------------------------------------
 * Returns data to be displayed in /proc/scsi/megaraid/X
 *----------------------------------------------------------*/
int megaraid_proc_info (char *buffer, char **start, off_t offset,
		    int length, int inode, int inout)
{
  *start = buffer;
  return 0;
}
 
int findCard (Scsi_Host_Template * pHostTmpl,
	  u_short pciVendor, u_short pciDev,
	  long flag)
{
  mega_host_config *megaCfg;
  struct Scsi_Host *host;
  u_char pciBus, pciDevFun, megaIrq;
  u_long megaBase;
  u_short pciIdx = 0;
 
#if LINUX_VERSION_CODE < 0x20100
  while (!pcibios_find_device (pciVendor, pciDev, pciIdx, &pciBus, &pciDevFun)) {
    if (flag & BOARD_QUARTZ) {
      u_int magic;
      pcibios_read_config_dword (pciBus, pciDevFun,
				 PCI_CONF_AMISIG,
				 &magic);
      if (magic != AMI_SIGNATURE) {
	continue;		/* not an AMI board */
      }
    }
#else
  struct pci_dev *pdev = pci_devices;
 
  while ((pdev = pci_find_device (pciVendor, pciDev, pdev))) {
    pciBus = pdev->bus->number;
    pciDevFun = pdev->devfn;
#endif
    printk (KERN_INFO "megaraid: found 0x%4.04x:0x%4.04x:idx %d:bus %d:slot %d:fun %d\n",
	    pciVendor,
	    pciDev,
	    pciIdx, pciBus,
	    PCI_SLOT (pciDevFun),
	    PCI_FUNC (pciDevFun));
 
    /* Read the base port and IRQ from PCI */
#if LINUX_VERSION_CODE < 0x20100
    pcibios_read_config_dword (pciBus, pciDevFun,
			       PCI_BASE_ADDRESS_0,
			       (u_int *) & megaBase);
    pcibios_read_config_byte (pciBus, pciDevFun,
			      PCI_INTERRUPT_LINE,
			      &megaIrq);
#else
    megaBase = pdev->base_address[0];
    megaIrq = pdev->irq;
#endif
    pciIdx++;
 
    if (flag & BOARD_QUARTZ) {
      megaBase &= PCI_BASE_ADDRESS_MEM_MASK;
      megaBase = (long) ioremap (megaBase, 128);
    }
    else {
      megaBase &= PCI_BASE_ADDRESS_IO_MASK;
      megaBase += 0x10;
    }
 
    /* Initialize SCSI Host structure */
    host = scsi_register (pHostTmpl, sizeof (mega_host_config));
    megaCfg = (mega_host_config *) host->hostdata;
    memset (megaCfg, 0, sizeof (mega_host_config));
 
    printk (KERN_INFO " scsi%d: Found a MegaRAID controller at 0x%x, IRQ: %d" CRLFSTR,
	    host->host_no, (u_int) megaBase, megaIrq);
 
    /* Copy resource info into structure */
    megaCfg->flag = flag;
    megaCfg->host = host;
    megaCfg->base = megaBase;
    megaCfg->host->irq = megaIrq;
    megaCfg->host->io_port = megaBase;
    megaCfg->host->n_io_port = 16;
    megaCfg->host->unique_id = (pciBus << 8) | pciDevFun;
    megaCtlrs[numCtlrs++] = megaCfg;
 
    if (flag != BOARD_QUARTZ) {
      /* Request our IO Range */
      if (check_region (megaBase, 16)) {
	printk (KERN_WARNING "megaraid: Couldn't register I/O range!" CRLFSTR);
	scsi_unregister (host);
	continue;
      }
      request_region (megaBase, 16, "megaraid");
    }
 
    /* Request our IRQ */
    if (request_irq (megaIrq, megaraid_isr, SA_SHIRQ,
		     "megaraid", megaCfg)) {
      printk (KERN_WARNING "megaraid: Couldn't register IRQ %d!" CRLFSTR,
	      megaIrq);
      scsi_unregister (host);
      continue;
    }
 
    mega_register_mailbox (megaCfg, virt_to_bus ((void *) &megaCfg->mailbox));
    mega_i_query_adapter (megaCfg);
 
    /* Initialize SCBs */
    initSCB (megaCfg);
 
  }
  return pciIdx;
}
 
/*---------------------------------------------------------
 * Detects if a megaraid controller exists in this system
 *---------------------------------------------------------*/
int megaraid_detect (Scsi_Host_Template * pHostTmpl)
{
  int count = 0;
 
  pHostTmpl->proc_dir = &proc_scsi_megaraid;
 
#if LINUX_VERSION_CODE < 0x20100
  if (!pcibios_present ()) {
    printk (KERN_WARNING "megaraid: PCI bios not present." CRLFSTR);
    return 0;
  }
#endif
 
  count += findCard (pHostTmpl, 0x101E, 0x9010, 0);
  count += findCard (pHostTmpl, 0x101E, 0x9060, 0);
  count += findCard (pHostTmpl, 0x8086, 0x1960, BOARD_QUARTZ);
 
  return count;
}
 
/*---------------------------------------------------------------------
 * Release the controller's resources
 *---------------------------------------------------------------------*/
int megaraid_release (struct Scsi_Host *pSHost)
{
  mega_host_config *megaCfg;
  mega_mailbox *mbox;
  u_char mboxData[16];
  int i;
 
  megaCfg = (mega_host_config *) pSHost->hostdata;
  mbox = (mega_mailbox *) mboxData;
 
  /* Flush cache to disk */
  memset (mbox, 0, 16);
  mboxData[0] = 0xA;
 
  /* Issue a blocking (interrupts disabled) command to the card */
  MegaIssueCmd (megaCfg, mboxData, NULL, 0);
 
  schedule ();
 
  /* Free our resources */
  if (megaCfg->flag & BOARD_QUARTZ) {
    iounmap ((void *) megaCfg->base);
  }
  else {
    release_region (megaCfg->host->io_port, 16);
  }
  free_irq (megaCfg->host->irq, megaCfg);	/* Must be freed first, otherwise
 
						   extra interrupt is generated */
  for (i = 0; i < megaCfg->max_cmds; i++) {
    if (megaCfg->scbList[i].sgList)
      kfree (megaCfg->scbList[i].sgList);	/* free sgList */
  }
  scsi_unregister (pSHost);
 
  return 0;
}
 
/*----------------------------------------------
 * Get information about the card/driver 
 *----------------------------------------------*/
const char * megaraid_info (struct Scsi_Host *pSHost)
{
  static char buffer[512];
  mega_host_config *megaCfg;
  mega_RAIDINQ *adapterInfo;
 
  megaCfg = (mega_host_config *) pSHost->hostdata;
  adapterInfo = (mega_RAIDINQ *) megaCfg->mega_buffer;
 
  sprintf (buffer, "AMI MegaRAID %s %d commands %d targs %d chans",
	   megaCfg->fwVer,
	   adapterInfo->AdpInfo.MaxConcCmds,
	   megaCfg->host->max_id,
	   megaCfg->host->max_channel);
  return buffer;
}
 
/*-----------------------------------------------------------------
 * Perform a SCSI command
 * Mailbox area:
 *   00 01 command
 *   01 01 command id
 *   02 02 # of sectors
 *   04 04 logical bus address
 *   08 04 physical buffer address
 *   0C 01 logical drive #
 *   0D 01 length of scatter/gather list
 *   0E 01 reserved
 *   0F 01 mailbox busy
 *   10 01 numstatus byte
 *   11 01 status byte 
 *-----------------------------------------------------------------*/
int megaraid_queue (Scsi_Cmnd * SCpnt, void (*pktComp) (Scsi_Cmnd *))
{
  mega_host_config *megaCfg;
  mega_scb *pScb;
 
  megaCfg = (mega_host_config *) SCpnt->host->hostdata;
 
  if (!(megaCfg->flag & (1L << SCpnt->channel))) {
    printk (KERN_INFO "scsi%d: scanning channel %c for devices.\n",
	    megaCfg->host->host_no,
	    SCpnt->channel + 'A');
    megaCfg->flag |= (1L << SCpnt->channel);
  }
 
  SCpnt->scsi_done = pktComp;
 
  /* Allocate and build a SCB request */
  if ((pScb = mega_build_cmd (megaCfg, SCpnt)) != NULL) {
    /* Add SCB to the head of the pending queue */
    ENQUEUE (pScb, mega_scb, qPending, next);
 
    /* Issue the command to the card */
    mega_runque (NULL);
  }
 
  return 0;
}
 
/*----------------------------------------------------------------------
 * Issue a blocking command to the controller
 *----------------------------------------------------------------------*/
volatile static int internal_done_flag = 0;
volatile static int internal_done_errcode = 0;
 
static void internal_done (Scsi_Cmnd * SCpnt)
{
  internal_done_errcode = SCpnt->result;
  internal_done_flag++;
}
 
/*
 *      This seems dangerous in an SMP environment because
 *      while spinning on internal_done_flag in 2.0.x SMP
 *      no IRQ's will be taken, including those that might
 *      be needed to clear this.
 *
 *      I think this should be using a wait queue ?
 *                              -- AC
 */      
 
/*
 *      I'll probably fix this in the next version, but
 *      megaraid_command() will never get called since can_queue is set,
 *      except maybe in a *really* old kernel in which case it's very
 *      unlikely they'd be using SMP anyway.  Really this function is
 *      just here for completeness.
 *                              - JLJ
 */
 
int megaraid_command (Scsi_Cmnd * SCpnt)
{
  internal_done_flag = 0;
 
  /* Queue command, and wait until it has completed */
  megaraid_queue (SCpnt, internal_done);
 
  while (!internal_done_flag)
    barrier ();
 
  return internal_done_errcode;
}
 
/*---------------------------------------------------------------------
 * Abort a previous SCSI request
 *---------------------------------------------------------------------*/
int megaraid_abort (Scsi_Cmnd * SCpnt)
{
  mega_host_config *megaCfg;
  int idx;
  long flags;
 
  spin_lock_irqsave (&mega_lock, flags);
 
  megaCfg = (mega_host_config *) SCpnt->host->hostdata;
 
  TRACE (("ABORT!!! %.08lx %.02x <%d.%d.%d>\n",
	SCpnt->serial_number, SCpnt->cmnd[0], SCpnt->channel, SCpnt->target,
	  SCpnt->lun));
  /*
   * Walk list of SCBs for any that are still outstanding
   */
  for (idx = 0; idx < megaCfg->max_cmds; idx++) {
    if (megaCfg->scbList[idx].idx >= 0) {
      if (megaCfg->scbList[idx].SCpnt == SCpnt) {
	freeSCB (&megaCfg->scbList[idx]);
 
	SCpnt->result = (DID_RESET << 16) | (SUGGEST_RETRY << 24);
	callDone (SCpnt);
      }
    }
  }
  spin_unlock_irqrestore (&mega_lock, flags);
  return SCSI_ABORT_SNOOZE;
}
 
/*---------------------------------------------------------------------
 * Reset a previous SCSI request
 *---------------------------------------------------------------------*/
int megaraid_reset (Scsi_Cmnd * SCpnt, unsigned int rstflags)
{
  mega_host_config *megaCfg;
  int idx;
  long flags;
 
  spin_lock_irqsave (&mega_lock, flags);
 
  megaCfg = (mega_host_config *) SCpnt->host->hostdata;
 
  TRACE (("RESET: %.08lx %.02x <%d.%d.%d>\n",
	SCpnt->serial_number, SCpnt->cmnd[0], SCpnt->channel, SCpnt->target,
	  SCpnt->lun));
 
  /*
   * Walk list of SCBs for any that are still outstanding
   */
  for (idx = 0; idx < megaCfg->max_cmds; idx++) {
    if (megaCfg->scbList[idx].idx >= 0) {
      SCpnt = megaCfg->scbList[idx].SCpnt;
      freeSCB (&megaCfg->scbList[idx]);
      SCpnt->result = (DID_RESET << 16) | (SUGGEST_RETRY << 24);
      callDone (SCpnt);
    }
  }
  spin_unlock_irqrestore (&mega_lock, flags);
  return SCSI_RESET_PUNT;
}
 
/*-------------------------------------------------------------
 * Return the disk geometry for a particular disk
 * Input:
 *   Disk *disk - Disk geometry
 *   kdev_t dev - Device node
 *   int *geom  - Returns geometry fields
 *     geom[0] = heads
 *     geom[1] = sectors
 *     geom[2] = cylinders
 *-------------------------------------------------------------*/
int megaraid_biosparam (Disk * disk, kdev_t dev, int *geom)
{
  int heads, sectors, cylinders;
  mega_host_config *megaCfg;
 
  /* Get pointer to host config structure */
  megaCfg = (mega_host_config *) disk->device->host->hostdata;
 
  /* Default heads (64) & sectors (32) */
  heads = 64;
  sectors = 32;
  cylinders = disk->capacity / (heads * sectors);
 
  /* Handle extended translation size for logical drives > 1Gb */
  if (disk->capacity >= 0x200000) {
    heads = 255;
    sectors = 63;
    cylinders = disk->capacity / (heads * sectors);
  }
 
  /* return result */
  geom[0] = heads;
  geom[1] = sectors;
  geom[2] = cylinders;
 
  return 0;
}
 
#ifdef MODULE
Scsi_Host_Template driver_template = MEGARAID;
 
#include "scsi_module.c"
#endif