patch-2.0.36 linux/drivers/scsi/megaraid.c

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diff -u --recursive --new-file v2.0.35/linux/drivers/scsi/megaraid.c linux/drivers/scsi/megaraid.c
@@ -0,0 +1,1347 @@
+/*===================================================================
+ *
+ *                    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 : 0.92
+ * 
+ * Description: Linux device driver for AMI MegaRAID controller
+ *
+ * History:
+ *
+ * Version 0.90:
+ *     Works and has been tested with the MegaRAID 428 controller, and
+ *     the MegaRAID 438 controller.  Probably works with the 466 also,
+ *     but not tested.
+ *
+ * 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>
+ *
+ * BUGS:
+ *     Tested with 2.1.90, but unfortunately there is a bug in pci.c which
+ *     fails to detect our controller.  Does work with 2.1.118--don't know
+ *     which kernel in between it was fixed in.
+ *     With SMP enabled under 2.1.118 with more than one processor, gets an
+ *     error message "scsi_end_request: buffer-list destroyed" under heavy
+ *     IO, but doesn't seem to affect operation, or data integrity.  The
+ *     message doesn't occur without SMP enabled, or with one proccessor with
+ *     SMP enabled, or under any combination under 2.0 kernels.
+ *
+ *===================================================================*/
+#define QISR 1
+
+#define CRLFSTR "\n"
+
+#define MULTIQ 1
+
+#include <linux/config.h>
+#include <linux/version.h>
+
+#ifdef MODULE
+#include <linux/module.h>
+
+#if LINUX_VERSION_CODE >= 0x20100
+char kernel_version[] = UTS_RELEASE;
+
+/* originally ported by Dell Corporation; updated, released, and maintained by
+   American Megatrends */
+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);
+
+/* 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[4] = { 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;
+
+    spin_lock_irqsave(mega_lock,flags);
+    va_start(args,fmt);
+    i = vsprintf(strbuf,fmt,args);
+    ser_puts(strbuf);
+    va_end(args);
+    spin_unlock_irqrestore(&mega_lock,flags);
+
+    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)
+{
+  long flags;
+
+  spin_lock_irqsave(&mega_lock,flags);
+  scb->flag  = 0;
+  scb->idx   = -1;
+  scb->next  = NULL;
+  scb->SCpnt = NULL;
+  spin_unlock_irqrestore(&mega_lock,flags);
+}
+
+/* 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)
+{
+  pScb->SCpnt->result = status;
+  ENQUEUE(pScb->SCpnt, Scsi_Cmnd, qCompleted, host_scribble);
+  freeSCB(pScb);
+}
+
+/*----------------------------------------------------
+ * 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)) {
+      printk(KERN_DEBUG "PENDING = %x, IN_ISR = %x, mbox.busy = %x\n",(u_int)(megaCfg->flag
+            & PENDING), (u_int)(megaCfg->flag & IN_ISR), megaCfg->mbox->busy);
+      TRACE(("%.08lx %.02x <%d.%d.%d> intr%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,
+	     intr_count,
+	     megaCfg->mbox->busy,
+	     (megaCfg->flag & IN_ISR)  ? 1 : 0,
+	     (megaCfg->flag & PENDING) ? 1 : 0));
+    }
+
+    if (MegaIssueCmd(megaCfg, pScb->mboxData, pScb, 1)) {
+      printk(KERN_DEBUG "MegaIssueCmd returned BUSY.  Rescheduling command.\n");
+      /* 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;
+
+  /* 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;
+}
+
+/*--------------------------------------------------------------------
+ * 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) {
+    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);
+            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);
+          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); /* locks 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;
+
+    /* Queue as a delayed ISR routine */
+    queue_task_irq_off(&runq, &tq_immediate);
+    mark_bh(IMMEDIATE_BH);
+    spin_unlock_irqrestore(&mega_lock,flags);
+
+  }
+}
+
+/*==================================================*/
+/* 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<0xFFFFFF; counter++) {
+    if (!mbox->busy) return 0;
+  }
+  return -1;
+}
+
+/*=====================================================
+ * 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 */
+
+  /* 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) {
+    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));
+    }
+    return -1;
+  }
+
+  /* Copy mailbox data into host structure */
+  spin_lock_irqsave(&mega_lock,flags);
+  memset(mbox, 0, sizeof(mega_mailbox));
+  memcpy(mbox, mboxData, 16);
+  spin_unlock_irqrestore(&mega_lock,flags);
+
+  /* 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);
+    }
+  }
+  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);
+
+      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);
+      
+      if (pScb) {
+	mega_cmd_done(megaCfg,pScb, mbox->status);
+	mega_rundoneq();
+      }
+      megaCfg->flag &= ~PENDING;
+    }
+  }
+
+  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->numldrv           = adapterInfo->LogdrvInfo.NumLDrv;
+
+#if 0
+  printk(KERN_DEBUG "---- Logical drive info ----\n");
+  for(i=0; i<megaCfg->numldrv; i++) {
+    printk(KERN_DEBUG "%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)) {
+#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];
+
+  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 */
+  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
+ *
+ * Note - this isnt 2.0.x SMP safe
+ *----------------------------------------------------------------------*/
+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
+ */
+ 
+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

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