/*
 *      eata.c - Low-level driver for EATA/DMA SCSI host adapters.
 *
 *      11 Mar 1995 rev. 2.00 for linux 1.2.0
 *          Fixed a bug which prevented media change detection for removable
 *          disk drives.
 *
 *      23 Feb 1995 rev. 1.18 for linux 1.1.94
 *          Added a check for scsi_register returning NULL.
 *
 *      11 Feb 1995 rev. 1.17 for linux 1.1.91
 *          Now DEBUG_RESET is disabled by default.
 *          Register a board even if it does not assert DMA protocol support
 *          (DPT SK2011B does not report correctly the dmasup bit).
 *
 *       9 Feb 1995 rev. 1.16 for linux 1.1.90
 *          Use host->wish_block instead of host->block.
 *          New list of Data Out SCSI commands.
 *
 *       8 Feb 1995 rev. 1.15 for linux 1.1.89
 *          Cleared target_time_out counter while performing a reset.
 *          All external symbols renamed to avoid possible name conflicts.
 *
 *      28 Jan 1995 rev. 1.14 for linux 1.1.86
 *          Added module support.
 *          Log and do a retry when a disk drive returns a target status 
 *          different from zero on a recovered error.
 *
 *      24 Jan 1995 rev. 1.13 for linux 1.1.85
 *          Use optimized board configuration, with a measured performance
 *          increase in the range 10%-20% on i/o throughput.
 *
 *      16 Jan 1995 rev. 1.12 for linux 1.1.81
 *          Fix mscp structure comments (no functional change).
 *          Display a message if check_region detects a port address
 *          already in use.
 *
 *      17 Dec 1994 rev. 1.11 for linux 1.1.74
 *          Use the scsicam_bios_param routine. This allows an easy
 *          migration path from disk partition tables created using 
 *          different SCSI drivers and non optimal disk geometry.
 *
 *      15 Dec 1994 rev. 1.10 for linux 1.1.74
 *          Added support for ISA EATA boards (DPT PM2011, DPT PM2021).
 *          The host->block flag is set for all the detected ISA boards.
 *          The detect routine no longer enforces LEVEL triggering
 *          for EISA boards, it just prints a warning message.
 *
 *      30 Nov 1994 rev. 1.09 for linux 1.1.68
 *          Redo i/o on target status CHECK_CONDITION for TYPE_DISK only.
 *          Added optional support for using a single board at a time.
 *
 *      18 Nov 1994 rev. 1.08 for linux 1.1.64
 *          Forces sg_tablesize = 64 and can_queue = 64 if these
 *          values are not correctly detected (DPT PM2012).
 *
 *      14 Nov 1994 rev. 1.07 for linux 1.1.63  Final BETA release.
 *      04 Aug 1994 rev. 1.00 for linux 1.1.39  First BETA release.
 *
 *
 *          This driver is based on the CAM (Common Access Method Committee)
 *          EATA (Enhanced AT Bus Attachment) rev. 2.0A, using DMA protocol.
 *
 *      Copyright (C) 1994, 1995 Dario Ballabio (dario@milano.europe.dg.com)
 *
 */

/*
 *
 *  Here is a brief description of the DPT SCSI host adapters.
 *  All these boards provide an EATA/DMA compatible programming interface
 *  and are fully supported by this driver:
 *
 *  PM2011B/9X -  Entry Level ISA
 *  PM2021A/9X -  High Performance ISA
 *  PM2012A       Old EISA
 *  PM2012B       Old EISA
 *  PM2022A/9X -  Entry Level EISA
 *  PM2122A/9X -  High Performance EISA
 *  PM2322A/9X -  Extra High Performance EISA
 *
 *  The DPT PM2001 provides only the EATA/PIO interface and hence is not
 *  supported by this driver.
 *
 *  This code has been tested with up to 3 Distributed Processing Technology 
 *  PM2122A/9X (DPT SCSI BIOS v002.D1, firmware v05E.0) eisa controllers,
 *  no on board cache and no RAID option. 
 *  BIOS must be enabled on the first board and must be disabled for all other 
 *  boards. 
 *  Support is provided for any number of DPT PM2122 eisa boards.
 *  All boards should be configured at the same IRQ level.
 *  Multiple IRQ configurations are supported too.
 *  Boards can be located in any eisa slot (1-15) and are named EATA0, 
 *  EATA1,... in increasing eisa slot number. ISA boards are detected
 *  after the eisa slot probes.
 *
 *  The IRQ for EISA boards should be _level_ triggered (not _edge_ triggered).
 *  This is a requirement in order to support multiple boards on the same IRQ.
 *
 *  Other eisa configuration parameters are:
 *
 *  COMMAND QUEUING   : ENABLED
 *  COMMAND TIMEOUT   : ENABLED
 *  CACHE             : DISABLED
 *
 *  In order to support multiple ISA boards in a reliable way,
 *  the driver sets host->wish_block = TRUE for all ISA boards.
 */

#if defined(MODULE)
#include <linux/module.h>
#include <linux/version.h>
#endif

#include <linux/string.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/system.h>
#include "../block/blk.h"
#include "scsi.h"
#include "hosts.h"
#include "sd.h"
#include <asm/dma.h>
#include <asm/irq.h>
#include "linux/in.h"
#include "eata.h"

/* Subversion values */
#define ISA  0
#define ESA 1

#undef FORCE_CONFIG

#undef  DEBUG_DETECT
#undef  DEBUG_INTERRUPT
#undef  DEBUG_STATISTICS
#undef  DEBUG_RESET

#define MAX_TARGET 8
#define MAX_IRQ 16
#define MAX_BOARDS 18
#define MAX_MAILBOXES 64
#define MAX_SGLIST 64
#define MAX_CMD_PER_LUN 2

#define FALSE 0
#define TRUE 1
#define FREE 0
#define IN_USE   1
#define LOCKED   2
#define IN_RESET 3
#define IGNORE   4
#define NO_IRQ  0xff
#define NO_DMA  0xff
#define MAXLOOP 200000

#define REG_CMD         7
#define REG_STATUS      7
#define REG_AUX_STATUS  8
#define REG_DATA        0
#define REG_DATA2       1
#define REG_SEE         6
#define REG_LOW         2
#define REG_LM          3
#define REG_MID         4
#define REG_MSB         5
#define REGION_SIZE     9
#define EISA_RANGE      0xf000
#define BSY_ASSERTED      0x80
#define DRQ_ASSERTED      0x08
#define ABSY_ASSERTED     0x01
#define IRQ_ASSERTED      0x02
#define READ_CONFIG_PIO   0xf0
#define SET_CONFIG_PIO    0xf1
#define SEND_CP_PIO       0xf2
#define RECEIVE_SP_PIO    0xf3
#define TRUNCATE_XFR_PIO  0xf4
#define RESET_PIO         0xf9
#define READ_CONFIG_DMA   0xfd
#define SET_CONFIG_DMA    0xfe
#define SEND_CP_DMA       0xff
#define ASOK              0x00
#define ASST              0x01

#define ARRAY_SIZE(arr) (sizeof (arr) / sizeof (arr)[0])

/* "EATA", in Big Endian format */
#define EATA_SIGNATURE 0x41544145

/* Number of valid bytes in the board config structure for EATA 2.0x */
#define EATA_2_0A_SIZE 28
#define EATA_2_0B_SIZE 30

/* Board info structure */
struct eata_info {
   ulong  data_len;     /* Number of valid bytes after this field */
   ulong  sign;         /* ASCII "EATA" signature */
   unchar        :4,    /* unused low nibble */
          version:4;    /* EATA version, should be 0x1 */
   unchar  ocsena:1,    /* Overlap Command Support Enabled */
           tarsup:1,    /* Target Mode Supported */
                 :2,
           dmasup:1,    /* DMA Supported */
           drqvld:1,    /* DRQ Index (DRQX) is valid */
              ata:1,    /* This is an ATA device */
           haaval:1;    /* Host Adapter Address Valid */
   ushort cp_pad_len;   /* Number of pad bytes after cp_len */
   unchar host_addr[3]; /* Host Adapter SCSI ID for channels 2, 1, 0 */
   unchar reserved;
   ulong  cp_len;       /* Number of valid bytes in cp */
   ulong  sp_len;       /* Number of valid bytes in sp */
   ushort queue_size;   /* Max number of cp that can be queued */
   ushort unused;
   ushort scatt_size;   /* Max number of entries in scatter/gather table */
   unchar     irq:4,    /* Interrupt Request assigned to this controller */
           irq_tr:1,    /* 0 for edge triggered, 1 for level triggered */
           second:1,    /* 1 if this is a secondary (not primary) controller */
             drqx:2;    /* DRQ Index (0=DMA0, 1=DMA7, 2=DMA6, 3=DMA5) */
   unchar  sync;        /* 1 if scsi target id 7...0 is running sync scsi */

   /* Structure extension defined in EATA 2.0B */
   unchar  isaena:1,    /* ISA i/o addressing is disabled/enabled */
         forcaddr:1,    /* Port address has been forced */
                 :6;
   unchar  max_id:5,    /* Max number of SCSI target IDs */
         max_chan:3;    /* Max SCSI channel number on this board */

   ushort ipad[249];
   };

/* Board config structure */
struct eata_config {
   ushort len;          /* Number of bytes following this field */
   unchar edis:1,       /* Disable EATA interface after config command */
         ocena:1,       /* Overlapped Commands Enabled */
        mdpena:1,       /* Transfer all Modified Data Pointer Messages */
        tarena:1,       /* Target Mode Enabled for this controller */
              :4;
   unchar cpad[511];
   };

/* Returned status packet structure */
struct mssp {
   unchar adapter_status:7,    /* State related to current command */
                     eoc:1;    /* End Of Command (1 = command completed) */
   unchar target_status;       /* SCSI status received after data transfer */
   unchar unused[2];
   ulong inv_res_len;          /* Number of bytes not transferred */
   Scsi_Cmnd *SCpnt;           /* Address set in cp */
   char mess[12];
   };

/* MailBox SCSI Command Packet */
struct mscp {
   unchar  sreset:1,     /* SCSI Bus Reset Signal should be asserted */
             init:1,     /* Re-initialize controller and self test */
           reqsen:1,     /* Transfer Request Sense Data to addr using DMA */
               sg:1,     /* Use Scatter/Gather */
                 :1,
           interp:1,     /* The controller interprets cp, not the target */ 
             dout:1,     /* Direction of Transfer is Out (Host to Target) */
              din:1;     /* Direction of Transfer is In (Target to Host) */
   unchar sense_len;     /* Request Sense Length */
   unchar unused[4];
   unchar phsunit:1,     /* Send to Target Physical Unit (bypass RAID) */
          notused:7;
   unchar target;        /* SCSI Target ID */
   unchar     lun:3,     /* LUN */
                 :2,
           luntar:1,     /* This cp is for Target (not LUN) */
           dispri:1,     /* Disconnect Privilege granted */
              one:1;     /* 1 */
   unchar mess[3];       /* Massage to/from Target */
   unchar cdb[12];       /* Command Descriptor Block */
   ulong  data_len;      /* If sg=0 Data Length, if sg=1 sglist length */
   Scsi_Cmnd *SCpnt;     /* Address to be returned is sp */
   ulong  data_address;  /* If sg=0 Data Address, if sg=1 sglist address */
   ulong  sp_addr;       /* Address where sp is DMA'ed when cp completes */
   ulong  sense_addr;    /* Address where Sense Data is DMA'ed on error */

   struct sg_list {
      unsigned int address;     /* Segment Address */
      unsigned int num_bytes;   /* Segment Length */
      } sglist[MAX_SGLIST];

   unsigned int index;   /* cp index */
   };

struct hostdata {
   struct mscp cp[MAX_MAILBOXES];       /* Mailboxes for this board */
   unsigned int cp_stat[MAX_MAILBOXES]; /* FREE, IN_USE, LOCKED, IN_RESET */
   unsigned int last_cp_used;           /* Index of last mailbox used */
   unsigned int iocount;                /* Total i/o done for this board */
   unsigned int multicount;             /* Total ... in second ihdlr loop */
   int board_number;                    /* Number of this board */
   char board_name[16];                 /* Name of this board */
   char board_id[256];                  /* data from INQUIRY on this board */
   int in_reset;                        /* True if board is doing a reset */
   int target_time_out[MAX_TARGET];     /* N. of timeout errors on target */
   int target_reset[MAX_TARGET];        /* If TRUE redo operation on target */
   unsigned char subversion;            /* Bus type, either ISA or ESA */
   unsigned char protocol_rev;          /* EATA 2.0 rev., 'A' or 'B' or 'C' */
   struct mssp sp[MAX_MAILBOXES];       /* Returned status for this board */
   };

static struct Scsi_Host * sh[MAX_BOARDS + 1];
static char* driver_name = "EATA";
static unsigned int irqlist[MAX_IRQ], calls[MAX_IRQ];

#define HD(board) ((struct hostdata *) &sh[board]->hostdata)
#define BN(board) (HD(board)->board_name)

static void eata2x_interrupt_handler(int, struct pt_regs *);
static int do_trace = FALSE;

static inline unchar wait_on_busy(ushort iobase) {
   unsigned int loop = MAXLOOP;

   while (inb(iobase + REG_AUX_STATUS) & ABSY_ASSERTED)
      if (--loop == 0) return TRUE;

   return FALSE;
}

static inline unchar do_dma (ushort iobase, unsigned int addr, unchar cmd) {

   if (wait_on_busy(iobase)) return TRUE;

   if (addr) {
      outb((char)  addr,        iobase + REG_LOW);
      outb((char) (addr >> 8),  iobase + REG_LM);
      outb((char) (addr >> 16), iobase + REG_MID);
      outb((char) (addr >> 24), iobase + REG_MSB);
      }

   outb(cmd, iobase + REG_CMD);
   return FALSE;
}

static inline unchar read_pio (ushort iobase, ushort *start, ushort *end) {
   unsigned int loop = MAXLOOP;
   ushort *p;

   for (p = start; p <= end; p++) {

      while (!(inb(iobase + REG_STATUS) & DRQ_ASSERTED)) 
         if (--loop == 0) return TRUE;

      loop = MAXLOOP;
      *p = inw(iobase);
      }

   return FALSE;
}

static inline int port_detect(ushort *port_base, unsigned int j, 
                              Scsi_Host_Template * tpnt) {
   unsigned char irq, dma_channel, subversion;
   unsigned char protocol_rev;
   struct eata_info info;
   char *board_status;

   /* Allowed DMA channels for ISA (0 indicates reserved) */
   unsigned char dma_channel_table[4] = { 5, 6, 7, 0 };

   char name[16];

   sprintf(name, "%s%d", driver_name, j);

   if(check_region(*port_base, REGION_SIZE)) {
      printk("%s: address 0x%03x in use, skipping probe.\n", 
             name, *port_base);
      return FALSE;
      }

   if (do_dma(*port_base, 0, READ_CONFIG_PIO)) return FALSE;

   /* Read the info structure */
   if (read_pio(*port_base, (ushort *)&info, (ushort *)&info.ipad[0])) 
      return FALSE;

   /* Check the controller "EATA" signature */
   if (info.sign != EATA_SIGNATURE) return FALSE;

   if (ntohl(info.data_len) < EATA_2_0A_SIZE) {
      printk("%s: config structure size (%ld bytes) too short, detaching.\n", 
             name, ntohl(info.data_len));
      return FALSE;
      }
   else if (ntohl(info.data_len) == EATA_2_0A_SIZE)
      protocol_rev = 'A';
   else if (ntohl(info.data_len) == EATA_2_0B_SIZE)
      protocol_rev = 'B';
   else
      protocol_rev = 'C';

   if (protocol_rev != 'A' && info.max_chan > 0)
      printk("%s: warning, only scsi channel 0 is supported.\n", name);

   irq = info.irq;

   if (*port_base & EISA_RANGE) {

      if (!info.haaval || info.ata || info.drqvld) {
         printk("%s: unusable EISA board found (%d%d%d), detaching.\n", 
                name, info.haaval, info.ata, info.drqvld);
         return FALSE;
         }

      subversion = ESA;
      dma_channel = NO_DMA;
      }
   else {

      if (!info.haaval || info.ata || !info.drqvld) {
         printk("%s: unusable ISA board found (%d%d%d), detaching.\n",
                name, info.haaval, info.ata, info.drqvld);
         return FALSE;
         }

      subversion = ISA;
      dma_channel = dma_channel_table[3 - info.drqx];
      }

   if (!info.dmasup)
      printk("%s: warning, DMA protocol support not asserted.\n", name);

   if (subversion == ESA && !info.irq_tr)
      printk("%s: warning, LEVEL triggering is suggested for IRQ %u.\n",
             name, irq);

   if (info.second)
      board_status = "Sec.";
   else
      board_status = "Prim.";

   /* Board detected, allocate its IRQ if not already done */
   if ((irq >= MAX_IRQ) || ((irqlist[irq] == NO_IRQ) && request_irq
       (irq, eata2x_interrupt_handler, SA_INTERRUPT, driver_name))) {
      printk("%s: unable to allocate IRQ %u, detaching.\n", name, irq);
      return FALSE;
      }

   if (subversion == ISA && request_dma(dma_channel, driver_name)) {
      printk("%s: unable to allocate DMA channel %u, detaching.\n",
             name, dma_channel);
      free_irq(irq);
      return FALSE;
      }

#if defined (FORCE_CONFIG)
   {
   struct eata_config config;

   /* Set board configuration */
   memset((char *)&config, 0, sizeof(struct eata_config));
   config.len = (ushort) htons((ushort)510);
   config.ocena = TRUE;

   if (do_dma(*port_base, (unsigned int)&config, SET_CONFIG_DMA)) {
      printk("%s: busy timeout sending configuration, detaching.\n", name);
      return FALSE;
      }
   }
#endif

   sh[j] = scsi_register(tpnt, sizeof(struct hostdata));

   if (sh[j] == NULL) {
      printk("%s: unable to register host, detaching.\n", name);

      if (irqlist[irq] == NO_IRQ) free_irq(irq);

      if (subversion == ISA) free_dma(dma_channel);

      return FALSE;
      }

   sh[j]->io_port = *port_base;
   sh[j]->n_io_port = REGION_SIZE;
   sh[j]->dma_channel = dma_channel;
   sh[j]->irq = irq;
   sh[j]->sg_tablesize = (ushort) ntohs(info.scatt_size);
   sh[j]->this_id = (ushort) info.host_addr[3];
   sh[j]->can_queue = (ushort) ntohs(info.queue_size);
   sh[j]->cmd_per_lun = MAX_CMD_PER_LUN;

   /* Register the I/O space that we use */
   request_region(sh[j]->io_port, REGION_SIZE, driver_name);

   memset(HD(j), 0, sizeof(struct hostdata));
   HD(j)->subversion = subversion;
   HD(j)->protocol_rev = protocol_rev;
   HD(j)->board_number = j;
   irqlist[irq] = j;

   if (HD(j)->subversion == ESA)
      sh[j]->unchecked_isa_dma = FALSE;
   else {
      sh[j]->wish_block = TRUE;
      sh[j]->unchecked_isa_dma = TRUE;
      disable_dma(dma_channel);
      clear_dma_ff(dma_channel);
      set_dma_mode(dma_channel, DMA_MODE_CASCADE);
      enable_dma(dma_channel);
      }

   strcpy(BN(j), name);

   printk("%s: 2.0%c, %s, ID %d, PORT 0x%03x, IRQ %u, DMA %u, SG %d, "\
          "Mbox %d, CmdLun %d.\n", BN(j), HD(j)->protocol_rev, board_status, 
           sh[j]->this_id, sh[j]->io_port, sh[j]->irq, sh[j]->dma_channel,
           sh[j]->sg_tablesize, sh[j]->can_queue, sh[j]->cmd_per_lun);

   /* DPT PM2012 does not allow to detect sg_tablesize correctly */
   if (sh[j]->sg_tablesize > MAX_SGLIST || sh[j]->sg_tablesize < 2) {
      printk("%s: detect, forcing to use %d SG lists.\n", BN(j), MAX_SGLIST);
      sh[j]->sg_tablesize = MAX_SGLIST;
      }

   /* DPT PM2012 does not allow to detect can_queue correctly */
   if (sh[j]->can_queue > MAX_MAILBOXES || sh[j]->can_queue  < 2) {
      printk("%s: detect, forcing to use %d Mbox.\n", BN(j), MAX_MAILBOXES);
      sh[j]->can_queue = MAX_MAILBOXES;
      }

#if defined (DEBUG_DETECT)
   if (protocol_rev != 'A')
      printk("%s: EATA 2.0%c, isaena %u, forcaddr %u, max_id %u,"\
             " max_chan %u.\n", name, protocol_rev, info.isaena, 
             info.forcaddr, info.max_id, info.max_chan);

   printk("%s: Version 0x%x, SYNC 0x%x, infol %ld, cpl %ld spl %ld.\n", 
          name, info.version, info.sync, ntohl(info.data_len), 
          ntohl(info.cp_len), ntohl(info.sp_len));
#endif

   return TRUE;
}

int eata2x_detect (Scsi_Host_Template * tpnt) {
   unsigned int j = 0, k, flags;

   ushort io_port[] = { 
      0x1c88, 0x2c88, 0x3c88, 0x4c88, 0x5c88, 0x6c88, 0x7c88, 0x8c88,
      0x9c88, 0xac88, 0xbc88, 0xcc88, 0xdc88, 0xec88, 0xfc88, 
      0x1f0,  0x170,  0x330,  0x230,  0x0
      };

   ushort *port_base = io_port;

   save_flags(flags);
   cli();

   for (k = 0; k < MAX_IRQ; k++) {
      irqlist[k] = NO_IRQ;
      calls[k] = 0;
      }

   for (k = 0; k < MAX_BOARDS + 1; k++) sh[k] = NULL;

   while (*port_base) {

      if (j < MAX_BOARDS && port_detect(port_base, j, tpnt)) j++;

      port_base++;
      }

   if (j > 0) 
      printk("EATA/DMA 2.0x: Copyright (C) 1994, 1995 Dario Ballabio.\n");

   restore_flags(flags);
   return j;
}

static inline void build_sg_list(struct mscp *cpp, Scsi_Cmnd *SCpnt) {
   unsigned int k;
   struct scatterlist * sgpnt;

   sgpnt = (struct scatterlist *) SCpnt->request_buffer;

   for (k = 0; k < SCpnt->use_sg; k++) {
      cpp->sglist[k].address = htonl((unsigned int) sgpnt[k].address);
      cpp->sglist[k].num_bytes = htonl((unsigned int) sgpnt[k].length);
      }

   cpp->data_address = htonl((unsigned int) cpp->sglist);
   cpp->data_len = htonl((SCpnt->use_sg * sizeof(struct sg_list)));
}

int eata2x_queuecommand (Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *)) {
   unsigned int i, j, k, flags;
   struct mscp *cpp;
   struct mssp *spp;

   static const unsigned char data_out_cmds[] = {
      0x0a, 0x2a, 0x15, 0x55, 0x04, 0x07, 0x0b, 0x10, 0x16, 0x18, 0x1d, 
      0x24, 0x2b, 0x2e, 0x30, 0x31, 0x32, 0x38, 0x39, 0x3a, 0x3b, 0x3d, 
      0x3f, 0x40, 0x41, 0x4c, 0xaa, 0xae, 0xb0, 0xb1, 0xb2, 0xb6, 0xea
      };

   save_flags(flags);
   cli();
   /* j is the board number */
   j = ((struct hostdata *) SCpnt->host->hostdata)->board_number;

   if (!done) panic("%s: qcomm, pid %ld, null done.\n", BN(j), SCpnt->pid);

   /* i is the mailbox number, look for the first free mailbox 
      starting from last_cp_used */
   i = HD(j)->last_cp_used + 1;

   for (k = 0; k < sh[j]->can_queue; k++, i++) {

      if (i >= sh[j]->can_queue) i = 0;

      if (HD(j)->cp_stat[i] == FREE) {
         HD(j)->last_cp_used = i;
         break;
         }
      }

   if (k == sh[j]->can_queue) {
      printk("%s: qcomm, no free mailbox, resetting.\n", BN(j));

      if (HD(j)->in_reset) 
         printk("%s: qcomm, already in reset.\n", BN(j));
      else if (eata2x_reset(SCpnt) == SCSI_RESET_SUCCESS) 
         panic("%s: qcomm, SCSI_RESET_SUCCESS.\n", BN(j));

      SCpnt->result = DID_BUS_BUSY << 16; 
      SCpnt->host_scribble = NULL;
      printk("%s: qcomm, pid %ld, DID_BUS_BUSY, done.\n", BN(j), SCpnt->pid);
      restore_flags(flags);
      done(SCpnt);    
      return 0;
      }

   /* Set pointer to control packet structure */
   cpp = &HD(j)->cp[i];

   memset(cpp, 0, sizeof(struct mscp));

   /* Set pointer to status packet structure */
   spp = &HD(j)->sp[i];

   memset(spp, 0, sizeof(struct mssp));

   /* The EATA protocol uses Big Endian format, while Intel is Little Endian */
   cpp->sp_addr = htonl((unsigned int) spp);

   SCpnt->scsi_done = done;
   cpp->index = i;
   SCpnt->host_scribble = (unsigned char *) &cpp->index;

   if (do_trace) printk("%s: qcomm, mbox %d, target %d, pid %ld.\n",
                        BN(j), i, SCpnt->target, SCpnt->pid);

   for (k = 0; k < ARRAY_SIZE(data_out_cmds); k++)
     if (SCpnt->cmnd[0] == data_out_cmds[k]) {
        cpp->dout = TRUE;
        break;
        }

   cpp->din = !cpp->dout;
   cpp->reqsen = TRUE;
   cpp->dispri = TRUE;
   cpp->one = TRUE;
   cpp->target = SCpnt->target;
   cpp->lun = SCpnt->lun;  
   cpp->SCpnt = SCpnt;
   cpp->sense_addr = htonl((unsigned int) SCpnt->sense_buffer); 
   cpp->sense_len = sizeof SCpnt->sense_buffer;

   if (SCpnt->use_sg) {
      cpp->sg = TRUE;
      build_sg_list(cpp, SCpnt);
      }
   else {
      cpp->data_address = htonl((unsigned int) SCpnt->request_buffer);
      cpp->data_len = htonl(SCpnt->request_bufflen);
      }

   memcpy(cpp->cdb, SCpnt->cmnd, SCpnt->cmd_len);

   /* Send control packet to the board */
   if (do_dma(sh[j]->io_port, (unsigned int) cpp, SEND_CP_DMA)) {
      SCpnt->result = DID_ERROR << 16; 
      SCpnt->host_scribble = NULL;
      printk("%s: qcomm, target %d, pid %ld, adapter busy, DID_ERROR, done.\n", 
             BN(j), SCpnt->target, SCpnt->pid);
      restore_flags(flags);
      done(SCpnt);    
      return 0;
      }

   HD(j)->cp_stat[i] = IN_USE;
   restore_flags(flags);
   return 0;
}

int eata2x_abort (Scsi_Cmnd *SCarg) {
   unsigned int i, j, flags;

   save_flags(flags);
   cli();
   j = ((struct hostdata *) SCarg->host->hostdata)->board_number;

   if (SCarg->host_scribble == NULL) {
      printk("%s: abort, target %d, pid %ld inactive.\n",
             BN(j), SCarg->target, SCarg->pid);
      return SCSI_ABORT_NOT_RUNNING;
      }

   i = *(unsigned int *)SCarg->host_scribble;
   printk("%s: abort, mbox %d, target %d, pid %ld.\n", 
          BN(j), i, SCarg->target, SCarg->pid);

   if (i >= sh[j]->can_queue)
      panic("%s: abort, invalid SCarg->host_scribble.\n", BN(j));

   if (wait_on_busy(sh[j]->io_port)) {
      printk("%s: abort, timeout error.\n", BN(j));
      restore_flags(flags);
      return SCSI_ABORT_ERROR;
      }

   if (HD(j)->cp_stat[i] == FREE) {
      printk("%s: abort, mbox %d is free.\n", BN(j), i);
      restore_flags(flags);
      return SCSI_ABORT_NOT_RUNNING;
      }

   if (HD(j)->cp_stat[i] == IN_USE) {
      printk("%s: abort, mbox %d is in use.\n", BN(j), i);

      if (SCarg != HD(j)->cp[i].SCpnt)
         panic("%s: abort, mbox %d, SCarg %p, cp SCpnt %p.\n",
               BN(j), i, SCarg, HD(j)->cp[i].SCpnt);

      restore_flags(flags);
      return SCSI_ABORT_SNOOZE;
      }

   if (HD(j)->cp_stat[i] == IN_RESET) {
      printk("%s: abort, mbox %d is in reset.\n", BN(j), i);
      restore_flags(flags);
      return SCSI_ABORT_ERROR;
      }

   if (HD(j)->cp_stat[i] == LOCKED) {
      printk("%s: abort, mbox %d is locked.\n", BN(j), i);
      restore_flags(flags);
      return SCSI_ABORT_NOT_RUNNING;
      }
   else
      panic("%s: abort, mbox %d, invalid cp_stat.\n", BN(j), i);
}

int eata2x_reset (Scsi_Cmnd *SCarg) {
   unsigned int i, j, flags, time, k, limit = 0;
   int arg_done = FALSE;
   Scsi_Cmnd *SCpnt;

   save_flags(flags);
   cli();
   j = ((struct hostdata *) SCarg->host->hostdata)->board_number;
   printk("%s: reset, enter, target %d, pid %ld.\n", 
          BN(j), SCarg->target, SCarg->pid);

   if (SCarg->host_scribble == NULL)
      printk("%s: reset, pid %ld inactive.\n", BN(j), SCarg->pid);

   if (HD(j)->in_reset) {
      printk("%s: reset, exit, already in reset.\n", BN(j));
      restore_flags(flags);
      return SCSI_RESET_ERROR;
      }

   if (wait_on_busy(sh[j]->io_port)) {
      printk("%s: reset, exit, timeout error.\n", BN(j));
      restore_flags(flags);
      return SCSI_RESET_ERROR;
      }

   for (k = 0; k < MAX_TARGET; k++) HD(j)->target_reset[k] = TRUE;

   for (k = 0; k < MAX_TARGET; k++) HD(j)->target_time_out[k] = 0;

   for (i = 0; i < sh[j]->can_queue; i++) {

      if (HD(j)->cp_stat[i] == FREE) continue;

      if (HD(j)->cp_stat[i] == LOCKED) {
         HD(j)->cp_stat[i] = FREE;
         printk("%s: reset, locked mbox %d forced free.\n", BN(j), i);
         continue;
         }

      SCpnt = HD(j)->cp[i].SCpnt;
      HD(j)->cp_stat[i] = IN_RESET;
      printk("%s: reset, mbox %d in reset, pid %ld.\n",
             BN(j), i, SCpnt->pid);

      if (SCpnt == NULL)
         panic("%s: reset, mbox %d, SCpnt == NULL.\n", BN(j), i);

      if (SCpnt->host_scribble == NULL)
         panic("%s: reset, mbox %d, garbled SCpnt.\n", BN(j), i);

      if (*(unsigned int *)SCpnt->host_scribble != i) 
         panic("%s: reset, mbox %d, index mismatch.\n", BN(j), i);

      if (SCpnt->scsi_done == NULL) 
         panic("%s: reset, mbox %d, SCpnt->scsi_done == NULL.\n", BN(j), i);

      if (SCpnt == SCarg) arg_done = TRUE;
      }

   if (do_dma(sh[j]->io_port, 0, RESET_PIO)) {
      printk("%s: reset, cannot reset, timeout error.\n", BN(j));
      restore_flags(flags);
      return SCSI_RESET_ERROR;
      }

   printk("%s: reset, board reset done, enabling interrupts.\n", BN(j));

#if defined (DEBUG_RESET)
   do_trace = TRUE;
#endif

   HD(j)->in_reset = TRUE;
   sti();
   time = jiffies;
   while (jiffies < (time + 100) && limit++ < 100000000);
   cli();
   printk("%s: reset, interrupts disabled, loops %d.\n", BN(j), limit);

   for (i = 0; i < sh[j]->can_queue; i++) {

      /* Skip mailboxes already set free by interrupt */
      if (HD(j)->cp_stat[i] != IN_RESET) continue;

      SCpnt = HD(j)->cp[i].SCpnt;
      SCpnt->result = DID_RESET << 16;
      SCpnt->host_scribble = NULL;

      /* This mailbox is still waiting for its interrupt */
      HD(j)->cp_stat[i] = LOCKED;

      printk("%s, reset, mbox %d locked, DID_RESET, pid %ld done.\n",
             BN(j), i, SCpnt->pid);
      restore_flags(flags);
      SCpnt->scsi_done(SCpnt);
      cli();
      }

   HD(j)->in_reset = FALSE;
   do_trace = FALSE;
   restore_flags(flags);

   if (arg_done) {
      printk("%s: reset, exit, success.\n", BN(j));
      return SCSI_RESET_SUCCESS;
      }
   else {
      printk("%s: reset, exit, wakeup.\n", BN(j));
      return SCSI_RESET_PUNT;
      }
}

static void eata2x_interrupt_handler(int irq, struct pt_regs * regs) {
   Scsi_Cmnd *SCpnt;
   unsigned int i, j, k, flags, status, tstatus, loops, total_loops = 0;
   struct mssp *spp;
   struct mscp *cpp;

   save_flags(flags);
   cli();

   if (irqlist[irq] == NO_IRQ) {
      printk("%s, ihdlr, irq %d, unexpected interrupt.\n", driver_name, irq);
      restore_flags(flags);
      return;
      }

   if (do_trace) printk("%s: ihdlr, enter, irq %d, calls %d.\n", 
                        driver_name, irq, calls[irq]);

   /* Service all the boards configured on this irq */
   for (j = 0; sh[j] != NULL; j++) {

      if (sh[j]->irq != irq) continue;

      loops = 0;

      /* Loop until all interrupts for a board are serviced */
      while (inb(sh[j]->io_port + REG_AUX_STATUS) & IRQ_ASSERTED) {
         total_loops++;
         loops++;

         if (do_trace) printk("%s: ihdlr, start service, count %d.\n",
                              BN(j), HD(j)->iocount);
   
         /* Read the status register to clear the interrupt indication */
         inb(sh[j]->io_port + REG_STATUS);
   
         /* Service all mailboxes of this board */
         for (i = 0; i < sh[j]->can_queue; i++) {
            spp = &HD(j)->sp[i];
   
            /* Check if this mailbox has completed the operation */
            if (spp->eoc == FALSE) continue;
   
            spp->eoc = FALSE;
   
            if (HD(j)->cp_stat[i] == IGNORE) {
               HD(j)->cp_stat[i] = FREE;
               continue;
               }
            else if (HD(j)->cp_stat[i] == LOCKED) {
               HD(j)->cp_stat[i] = FREE;
               printk("%s: ihdlr, mbox %d unlocked, count %d.\n",
                      BN(j), i, HD(j)->iocount);
               continue;
               }
            else if (HD(j)->cp_stat[i] == FREE) {
               printk("%s: ihdlr, mbox %d is free, count %d.\n", 
                      BN(j), i, HD(j)->iocount);
               continue;
               }
            else if (HD(j)->cp_stat[i] == IN_RESET)
               printk("%s: ihdlr, mbox %d is in reset.\n", BN(j), i);
            else if (HD(j)->cp_stat[i] != IN_USE) 
               panic("%s: ihdlr, mbox %d, invalid cp_stat.\n", BN(j), i);
   
            HD(j)->cp_stat[i] = FREE;
            cpp = &HD(j)->cp[i];
            SCpnt = spp->SCpnt;
   
            if (SCpnt == NULL)
               panic("%s: ihdlr, mbox %d, SCpnt == NULL.\n", BN(j), i);
   
            if (SCpnt != cpp->SCpnt)
               panic("%s: ihdlr, mbox %d, sp SCpnt %p, cp SCpnt %p.\n",
                     BN(j), i, SCpnt, cpp->SCpnt);
   
            if (SCpnt->host_scribble == NULL)
               panic("%s: ihdlr, mbox %d, pid %ld, SCpnt %p garbled.\n",
                     BN(j), i, SCpnt->pid, SCpnt);
   
            if (*(unsigned int *)SCpnt->host_scribble != i) 
               panic("%s: ihdlr, mbox %d, pid %ld, index mismatch %d,"\
                     " irq %d.\n", BN(j), i, SCpnt->pid, 
                     *(unsigned int *)SCpnt->host_scribble, irq);
   
            tstatus = status_byte(spp->target_status);
   
            switch (spp->adapter_status) {
               case ASOK:     /* status OK */
   
                  /* Forces a reset if a disk drive keeps returning BUSY */
                  if (tstatus == BUSY && SCpnt->device->type != TYPE_TAPE) 
                     status = DID_ERROR << 16;
   
                  /* If there was a bus reset, redo operation on each target */
                  else if (tstatus != GOOD
                           && SCpnt->device->type == TYPE_DISK
                           && HD(j)->target_reset[SCpnt->target])
                     status = DID_BUS_BUSY << 16;
   
                  /* Works around a flaw in scsi.c */
                  else if (tstatus == CHECK_CONDITION
                           && SCpnt->device->type == TYPE_DISK
                           && (SCpnt->sense_buffer[2] & 0xf) == RECOVERED_ERROR)
                     status = DID_BUS_BUSY << 16;

                  else
                     status = DID_OK << 16;
   
                  if (tstatus == GOOD)
                     HD(j)->target_reset[SCpnt->target] = FALSE;
   
                  if (spp->target_status && SCpnt->device->type == TYPE_DISK)
                     printk("%s: ihdlr, target %d:%d, pid %ld, target_status "\
                            "0x%x, sense key 0x%x.\n", BN(j), 
                            SCpnt->target, SCpnt->lun, SCpnt->pid,
                            spp->target_status, SCpnt->sense_buffer[2]);
   
                  HD(j)->target_time_out[SCpnt->target] = 0;
   
                  break;
               case ASST:     /* Selection Time Out */
               case 0x02:     /* Command Time Out   */
   
                  if (HD(j)->target_time_out[SCpnt->target] > 1)
                     status = DID_ERROR << 16;
                  else {
                     status = DID_TIME_OUT << 16;
                     HD(j)->target_time_out[SCpnt->target]++;
                     }
   
                  break;
               case 0x03:     /* SCSI Bus Reset Received */
               case 0x04:     /* Initial Controller Power-up */
   
                  if (SCpnt->device->type != TYPE_TAPE)
                     status = DID_BUS_BUSY << 16;
                  else
                     status = DID_ERROR << 16;
   
                  for (k = 0; k < MAX_TARGET; k++) 
                     HD(j)->target_reset[k] = TRUE;
   
                  break;
               case 0x07:     /* Bus Parity Error */
               case 0x0c:     /* Controller Ram Parity */
               case 0x05:     /* Unexpected Bus Phase */
               case 0x06:     /* Unexpected Bus Free */
               case 0x08:     /* SCSI Hung */
               case 0x09:     /* Unexpected Message Reject */
               case 0x0a:     /* SCSI Bus Reset Stuck */
               case 0x0b:     /* Auto Request-Sense Failed */
               default:
                  status = DID_ERROR << 16;
                  break;
               }
   
            SCpnt->result = status | spp->target_status;
            HD(j)->iocount++;

            if (loops > 1) HD(j)->multicount++;

#if defined (DEBUG_INTERRUPT)
            if (SCpnt->result || do_trace)
#else
            if ((spp->adapter_status != ASOK && HD(j)->iocount >  1000) ||
                (spp->adapter_status != ASOK && 
                 spp->adapter_status != ASST && HD(j)->iocount <= 1000) ||
                do_trace)
#endif
               printk("%s: ihdlr, mbox %d, err 0x%x:%x,"\
                      " target %d:%d, pid %ld, count %d.\n",
                      BN(j), i, spp->adapter_status, spp->target_status,
                      SCpnt->target, SCpnt->lun, SCpnt->pid, HD(j)->iocount);
   
            /* Set the command state to inactive */
            SCpnt->host_scribble = NULL;
   
            restore_flags(flags);
            SCpnt->scsi_done(SCpnt);
            cli();

            }   /* Mailbox loop */

         }   /* Multiple command loop */

      }   /* Boards loop */

   calls[irq]++;

   if (total_loops == 0) 
     printk("%s: ihdlr, irq %d, no command completed, calls %d.\n",
            driver_name, irq, calls[irq]);

   if (do_trace) printk("%s: ihdlr, exit, irq %d, calls %d.\n", 
                        driver_name, irq, calls[irq]);

#if defined (DEBUG_STATISTICS)
   if ((calls[irq] % 100000) == 10000)
      for (j = 0; sh[j] != NULL; j++)
         printk("%s: ihdlr, calls %d, count %d, multi %d.\n", BN(j),
                calls[(sh[j]->irq)], HD(j)->iocount, HD(j)->multicount);
#endif

   restore_flags(flags);
   return;
}

#if defined(MODULE)
Scsi_Host_Template driver_template = EATA;

#include "scsi_module.c"
#endif
