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ibmmca.c

/*
 Low Level Linux Driver for the IBM Microchannel SCSI Subsystem for
 Linux Kernel >= 2.4.0.
 Copyright (c) 1995 Strom Systems, Inc. under the terms of the GNU
 General Public License. Written by Martin Kolinek, December 1995.
 Further development by: Chris Beauregard, Klaus Kudielka, Michael Lang
 See the file Documentation/scsi/ibmmca.txt for a detailed description
 of this driver, the commandline arguments and the history of its
 development.
 See the WWW-page: http://www.uni-mainz.de/~langm000/linux.html for latest
 updates, info and ADF-files for adapters supported by this driver.

 Alan Cox <alan@lxorguk.ukuu.org.uk>
 Updated for Linux 2.5.45 to use the new error handler, cleaned up the
 lock macros and did a few unavoidable locking tweaks, plus one locking
 fix in the irq and completion path.
 
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/mca.h>
#include <linux/spinlock.h>
#include <linux/init.h>

#include <asm/system.h>
#include <asm/io.h>

#include "scsi.h"
#include <scsi/scsi_host.h>

/* Common forward declarations for all Linux-versions: */
static int ibmmca_queuecommand (Scsi_Cmnd *, void (*done) (Scsi_Cmnd *));
static int ibmmca_abort (Scsi_Cmnd *);
static int ibmmca_host_reset (Scsi_Cmnd *);
static int ibmmca_biosparam (struct scsi_device *, struct block_device *, sector_t, int *);
static int ibmmca_proc_info(struct Scsi_Host *shpnt, char *buffer, char **start, off_t offset, int length, int inout);



/* current version of this driver-source: */
#define IBMMCA_SCSI_DRIVER_VERSION "4.0b-ac"

/* driver configuration */
#define IM_MAX_HOSTS     8    /* maximum number of host adapters */
#define IM_RESET_DELAY  60    /* seconds allowed for a reset */

/* driver debugging - #undef all for normal operation */
/* if defined: count interrupts and ignore this special one: */
#undef      IM_DEBUG_TIMEOUT  //50
#define TIMEOUT_PUN     0
#define TIMEOUT_LUN     0
/* verbose interrupt: */
#undef IM_DEBUG_INT
/* verbose queuecommand: */
#undef IM_DEBUG_CMD
/* verbose queucommand for specific SCSI-device type: */
#undef IM_DEBUG_CMD_SPEC_DEV
/* verbose device probing */
#undef IM_DEBUG_PROBE

/* device type that shall be displayed on syslog (only during debugging): */
#define IM_DEBUG_CMD_DEVICE   TYPE_TAPE

/* relative addresses of hardware registers on a subsystem */
#define IM_CMD_REG(h)   ((h)->io_port)    /*Command Interface, (4 bytes long) */
#define IM_ATTN_REG(h)  ((h)->io_port+4)  /*Attention (1 byte) */
#define IM_CTR_REG(h)   ((h)->io_port+5)  /*Basic Control (1 byte) */
#define IM_INTR_REG(h)  ((h)->io_port+6)  /*Interrupt Status (1 byte, r/o) */
#define IM_STAT_REG(h)  ((h)->io_port+7)  /*Basic Status (1 byte, read only) */

/* basic I/O-port of first adapter */
#define IM_IO_PORT      0x3540
/* maximum number of hosts that can be found */
#define IM_N_IO_PORT    8

/*requests going into the upper nibble of the Attention register */
/*note: the lower nibble specifies the device(0-14), or subsystem(15) */
#define IM_IMM_CMD      0x10  /*immediate command */
#define IM_SCB          0x30  /*Subsystem Control Block command */
#define IM_LONG_SCB     0x40  /*long Subsystem Control Block command */
#define IM_EOI          0xe0  /*end-of-interrupt request */

/*values for bits 7,1,0 of Basic Control reg. (bits 6-2 reserved) */
#define IM_HW_RESET     0x80  /*hardware reset */
#define IM_ENABLE_DMA   0x02  /*enable subsystem's busmaster DMA */
#define IM_ENABLE_INTR  0x01  /*enable interrupts to the system */

/*to interpret the upper nibble of Interrupt Status register */
/*note: the lower nibble specifies the device(0-14), or subsystem(15) */
#define IM_SCB_CMD_COMPLETED              0x10
#define IM_SCB_CMD_COMPLETED_WITH_RETRIES 0x50
#define IM_LOOP_SCATTER_BUFFER_FULL       0x60
#define IM_ADAPTER_HW_FAILURE             0x70
#define IM_IMMEDIATE_CMD_COMPLETED        0xa0
#define IM_CMD_COMPLETED_WITH_FAILURE           0xc0
#define IM_CMD_ERROR                      0xe0
#define IM_SOFTWARE_SEQUENCING_ERROR            0xf0

/*to interpret bits 3-0 of Basic Status register (bits 7-4 reserved) */
#define IM_CMD_REG_FULL       0x08
#define IM_CMD_REG_EMPTY      0x04
#define IM_INTR_REQUEST       0x02
#define IM_BUSY               0x01

/*immediate commands (word written into low 2 bytes of command reg) */
#define IM_RESET_IMM_CMD      0x0400
#define IM_FEATURE_CTR_IMM_CMD      0x040c
#define IM_DMA_PACING_IMM_CMD 0x040d
#define IM_ASSIGN_IMM_CMD     0x040e
#define IM_ABORT_IMM_CMD      0x040f
#define IM_FORMAT_PREP_IMM_CMD      0x0417

/*SCB (Subsystem Control Block) structure */
00124 struct im_scb {
      unsigned short command; /*command word (read, etc.) */
      unsigned short enable;  /*enable word, modifies cmd */
      union {
            unsigned long log_blk_adr;    /*block address on SCSI device */
            unsigned char scsi_cmd_length;      /*6,10,12, for other scsi cmd */
      } u1;
      unsigned long sys_buf_adr;    /*physical system memory adr */
      unsigned long sys_buf_length; /*size of sys mem buffer */
      unsigned long tsb_adr;  /*Termination Status Block adr */
      unsigned long scb_chain_adr;  /*optional SCB chain address */
      union {
            struct {
                  unsigned short count;   /*block count, on SCSI device */
                  unsigned short length;  /*block length, on SCSI device */
            } blk;
            unsigned char scsi_command[12];     /*other scsi command */
      } u2;
};

/*structure scatter-gather element (for list of system memory areas) */
00145 struct im_sge {
      void *address;
      unsigned long byte_length;
};

/*structure returned by a get_pos_info command: */
00151 struct im_pos_info {
      unsigned short pos_id;  /* adapter id */
      unsigned char pos_3a;   /* pos 3 (if pos 6 = 0) */
      unsigned char pos_2;    /* pos 2 */
      unsigned char int_level;      /* interrupt level IRQ 11 or 14 */
      unsigned char pos_4a;   /* pos 4 (if pos 6 = 0) */
      unsigned short connector_size;      /* MCA connector size: 16 or 32 Bit */
      unsigned char num_luns; /* number of supported luns per device */
      unsigned char num_puns; /* number of supported puns */
      unsigned char pacing_factor;  /* pacing factor */
      unsigned char num_ldns; /* number of ldns available */
      unsigned char eoi_off;  /* time EOI and interrupt inactive */
      unsigned char max_busy; /* time between reset and busy on */
      unsigned short cache_stat;    /* ldn cachestat. Bit=1 = not cached */
      unsigned short retry_stat;    /* retry status of ldns. Bit=1=disabled */
      unsigned char pos_4b;   /* pos 4 (if pos 6 = 1) */
      unsigned char pos_3b;   /* pos 3 (if pos 6 = 1) */
      unsigned char pos_6;    /* pos 6 */
      unsigned char pos_5;    /* pos 5 */
      unsigned short max_overlap;   /* maximum overlapping requests */
      unsigned short num_bus; /* number of SCSI-busses */
};

/*values for SCB command word */
#define IM_NO_SYNCHRONOUS      0x0040     /*flag for any command */
#define IM_NO_DISCONNECT       0x0080     /*flag for any command */
#define IM_READ_DATA_CMD       0x1c01
#define IM_WRITE_DATA_CMD      0x1c02
#define IM_READ_VERIFY_CMD     0x1c03
#define IM_WRITE_VERIFY_CMD    0x1c04
#define IM_REQUEST_SENSE_CMD   0x1c08
#define IM_READ_CAPACITY_CMD   0x1c09
#define IM_DEVICE_INQUIRY_CMD  0x1c0b
#define IM_READ_LOGICAL_CMD    0x1c2a
#define IM_OTHER_SCSI_CMD_CMD  0x241f

/* unused, but supported, SCB commands */
#define IM_GET_COMMAND_COMPLETE_STATUS_CMD   0x1c07   /* command status */
#define IM_GET_POS_INFO_CMD                  0x1c0a   /* returns neat stuff */
#define IM_READ_PREFETCH_CMD                 0x1c31   /* caching controller only */
#define IM_FOMAT_UNIT_CMD                    0x1c16   /* format unit */
#define IM_REASSIGN_BLOCK_CMD                0x1c18   /* in case of error */

/*values to set bits in the enable word of SCB */
#define IM_READ_CONTROL              0x8000
#define IM_REPORT_TSB_ONLY_ON_ERROR  0x4000
#define IM_RETRY_ENABLE              0x2000
#define IM_POINTER_TO_LIST           0x1000
#define IM_SUPRESS_EXCEPTION_SHORT   0x0400
#define IM_BYPASS_BUFFER             0x0200
#define IM_CHAIN_ON_NO_ERROR         0x0001

/*TSB (Termination Status Block) structure */
00204 struct im_tsb {
      unsigned short end_status;
      unsigned short reserved1;
      unsigned long residual_byte_count;
      unsigned long sg_list_element_adr;
      unsigned short status_length;
      unsigned char dev_status;
      unsigned char cmd_status;
      unsigned char dev_error;
      unsigned char cmd_error;
      unsigned short reserved2;
      unsigned short reserved3;
      unsigned short low_of_last_scb_adr;
      unsigned short high_of_last_scb_adr;
};

/*subsystem uses interrupt request level 14 */
#define IM_IRQ     14
/*SCSI-2 F/W may evade to interrupt 11 */
#define IM_IRQ_FW  11

/* Model 95 has an additional alphanumeric display, which can be used
   to display SCSI-activities. 8595 models do not have any disk led, which
   makes this feature quite useful.
   The regular PS/2 disk led is turned on/off by bits 6,7 of system
   control port. */

/* LED display-port (actually, last LED on display) */
#define MOD95_LED_PORT     0x108
/* system-control-register of PS/2s with diskindicator */
#define PS2_SYS_CTR        0x92
/* activity displaying methods */
#define LED_DISP           1
#define LED_ADISP          2
#define LED_ACTIVITY       4
/* failed intr */
#define CMD_FAIL           255

/* The SCSI-ID(!) of the accessed SCSI-device is shown on PS/2-95 machines' LED
   displays. ldn is no longer displayed here, because the ldn mapping is now 
   done dynamically and the ldn <-> pun,lun maps can be looked-up at boottime 
   or during uptime in /proc/scsi/ibmmca/<host_no> in case of trouble, 
   interest, debugging or just for having fun. The left number gives the
   host-adapter number and the right shows the accessed SCSI-ID. */

/* display_mode is set by the ibmmcascsi= command line arg */
static int display_mode = 0;
/* set default adapter timeout */
static unsigned int adapter_timeout = 45;
/* for probing on feature-command: */
static unsigned int global_command_error_excuse = 0;
/* global setting by command line for adapter_speed */
static int global_adapter_speed = 0;      /* full speed by default */

/* Panel / LED on, do it right for F/W addressin, too. adisplay will
 * just ignore ids>7, as the panel has only 7 digits available */
#define PS2_DISK_LED_ON(ad,id) { if (display_mode & LED_DISP) { if (id>9) \
    outw((ad+48)|((id+55)<<8), MOD95_LED_PORT ); else \
    outw((ad+48)|((id+48)<<8), MOD95_LED_PORT ); } else \
    if (display_mode & LED_ADISP) { if (id<7) outb((char)(id+48),MOD95_LED_PORT+1+id); \
    outb((char)(ad+48), MOD95_LED_PORT); } \
    if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
    outb(inb(PS2_SYS_CTR) | 0xc0, PS2_SYS_CTR); }

/* Panel / LED off */
/* bug fixed, Dec 15, 1997, where | was replaced by & here */
#define PS2_DISK_LED_OFF() { if (display_mode & LED_DISP) \
    outw(0x2020, MOD95_LED_PORT ); else if (display_mode & LED_ADISP) { \
    outl(0x20202020,MOD95_LED_PORT); outl(0x20202020,MOD95_LED_PORT+4); } \
    if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
    outb(inb(PS2_SYS_CTR) & 0x3f, PS2_SYS_CTR); }

/* types of different supported hardware that goes to hostdata special */
#define IBM_SCSI2_FW     0
#define IBM_7568_WCACHE  1
#define IBM_EXP_UNIT     2
#define IBM_SCSI_WCACHE  3
#define IBM_SCSI         4
#define IBM_INTEGSCSI    5

/* other special flags for hostdata structure */
#define FORCED_DETECTION         100
#define INTEGRATED_SCSI          101

/* List of possible IBM-SCSI-adapters */
static short ibmmca_id_table[] = {
      0x8efc,
      0x8efd,
      0x8ef8,
      0x8eff,
      0x8efe,
      /* No entry for integrated SCSI, that's part of the register */
      0
};

static const char *ibmmca_description[] = {
      "IBM SCSI-2 F/W Adapter",     /* special = 0 */
      "IBM 7568 Industrial Computer SCSI Adapter w/Cache",  /* special = 1 */
      "IBM Expansion Unit SCSI Controller",     /* special = 2 */
      "IBM SCSI Adapter w/Cache",   /* special = 3 */
      "IBM SCSI Adapter",     /* special = 4 */
      "IBM Integrated SCSI Controller", /* special = 5 */
};

/* Max number of logical devices (can be up from 0 to 14).  15 is the address
of the adapter itself. */
#define MAX_LOG_DEV  15

/*local data for a logical device */
00313 struct logical_device {
      struct im_scb scb;      /* SCSI-subsystem-control-block structure */
      struct im_tsb tsb;      /* SCSI command complete status block structure */
      struct im_sge sge[16];  /* scatter gather list structure */
      unsigned char buf[256]; /* SCSI command return data buffer */
      Scsi_Cmnd *cmd;         /* SCSI-command that is currently in progress */
      int device_type;  /* type of the SCSI-device. See include/scsi/scsi.h
                           for interpretation of the possible values */
      int block_length; /* blocksize of a particular logical SCSI-device */
      int cache_flag;         /* 1 if this is uncached, 0 if cache is present for ldn */
      int retry_flag;         /* 1 if adapter retry is disabled, 0 if enabled */
};

/* statistics of the driver during operations (for proc_info) */
00327 struct Driver_Statistics {
      /* SCSI statistics on the adapter */
      int ldn_access[MAX_LOG_DEV + 1];    /* total accesses on a ldn */
      int ldn_read_access[MAX_LOG_DEV + 1];     /* total read-access on a ldn */
      int ldn_write_access[MAX_LOG_DEV + 1];    /* total write-access on a ldn */
      int ldn_inquiry_access[MAX_LOG_DEV + 1];  /* total inquiries on a ldn */
      int ldn_modeselect_access[MAX_LOG_DEV + 1];     /* total mode selects on ldn */
      int scbs;         /* short SCBs queued */
      int long_scbs;          /* long SCBs queued */
      int total_accesses;     /* total accesses on all ldns */
      int total_interrupts;   /* total interrupts (should be
                           same as total_accesses) */
      int total_errors; /* command completed with error */
      /* dynamical assignment statistics */
      int total_scsi_devices; /* number of physical pun,lun */
      int dyn_flag;           /* flag showing dynamical mode */
      int dynamical_assignments;    /* number of remappings of ldns */
      int ldn_assignments[MAX_LOG_DEV + 1];     /* number of remappings of each
                                       ldn */
};

/* data structure for each host adapter */
00349 struct ibmmca_hostdata {
      /* array of logical devices: */
      struct logical_device _ld[MAX_LOG_DEV + 1];
      /* array to convert (pun, lun) into logical device number: */
      unsigned char _get_ldn[16][8];
      /*array that contains the information about the physical SCSI-devices
         attached to this host adapter: */
      unsigned char _get_scsi[16][8];
      /* used only when checking logical devices: */
      int _local_checking_phase_flag;
      /* report received interrupt: */
      int _got_interrupt;
      /* report termination-status of SCSI-command: */
      int _stat_result;
      /* reset status (used only when doing reset): */
      int _reset_status;
      /* code of the last SCSI command (needed for panic info): */
      int _last_scsi_command[MAX_LOG_DEV + 1];
      /* identifier of the last SCSI-command type */
      int _last_scsi_type[MAX_LOG_DEV + 1];
      /* last blockcount */
      int _last_scsi_blockcount[MAX_LOG_DEV + 1];
      /* last locgical block address */
      unsigned long _last_scsi_logical_block[MAX_LOG_DEV + 1];
      /* Counter that points on the next reassignable ldn for dynamical
         remapping. The default value is 7, that is the first reassignable
         number in the list at boottime: */
      int _next_ldn;
      /* Statistics-structure for this IBM-SCSI-host: */
      struct Driver_Statistics _IBM_DS;
      /* This hostadapters pos-registers pos2 until pos6 */
      unsigned int _pos[8];
      /* assign a special variable, that contains dedicated info about the
         adaptertype */
      int _special;
      /* connector size on the MCA bus */
      int _connector_size;
      /* synchronous SCSI transfer rate bitpattern */
      int _adapter_speed;
};

/* macros to access host data structure */
#define subsystem_pun(h) ((h)->this_id)
#define subsystem_maxid(h) ((h)->max_id)
#define ld(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_ld)
#define get_ldn(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_get_ldn)
#define get_scsi(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_get_scsi)
#define local_checking_phase_flag(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_local_checking_phase_flag)
#define got_interrupt(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_got_interrupt)
#define stat_result(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_stat_result)
#define reset_status(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_reset_status)
#define last_scsi_command(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_last_scsi_command)
#define last_scsi_type(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_last_scsi_type)
#define last_scsi_blockcount(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_last_scsi_blockcount)
#define last_scsi_logical_block(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_last_scsi_logical_block)
#define last_scsi_type(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_last_scsi_type)
#define next_ldn(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_next_ldn)
#define IBM_DS(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_IBM_DS)
#define special(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_special)
#define subsystem_connector_size(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_connector_size)
#define adapter_speed(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_adapter_speed)
#define pos2(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_pos[2])
#define pos3(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_pos[3])
#define pos4(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_pos[4])
#define pos5(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_pos[5])
#define pos6(h) (((struct ibmmca_hostdata *) (h)->hostdata)->_pos[6])

/* Define a arbitrary number as subsystem-marker-type. This number is, as
   described in the ANSI-SCSI-standard, not occupied by other device-types. */
#define TYPE_IBM_SCSI_ADAPTER   0x2F

/* Define 0xFF for no device type, because this type is not defined within
   the ANSI-SCSI-standard, therefore, it can be used and should not cause any
   harm. */
#define TYPE_NO_DEVICE          0xFF

/* define medium-changer. If this is not defined previously, e.g. Linux
   2.0.x, define this type here. */
#ifndef TYPE_MEDIUM_CHANGER
#define TYPE_MEDIUM_CHANGER     0x08
#endif

/* define possible operations for the immediate_assign command */
#define SET_LDN        0
#define REMOVE_LDN     1

/* ldn which is used to probe the SCSI devices */
#define PROBE_LDN      0

/* reset status flag contents */
#define IM_RESET_NOT_IN_PROGRESS         0
#define IM_RESET_IN_PROGRESS             1
#define IM_RESET_FINISHED_OK             2
#define IM_RESET_FINISHED_FAIL           3
#define IM_RESET_NOT_IN_PROGRESS_NO_INT  4
#define IM_RESET_FINISHED_OK_NO_INT      5

/* define undefined SCSI-command */
#define NO_SCSI                  0xffff

/*-----------------------------------------------------------------------*/

/* if this is nonzero, ibmmcascsi option has been passed to the kernel */
static int io_port[IM_MAX_HOSTS] = { 0, 0, 0, 0, 0, 0, 0, 0 };
static int scsi_id[IM_MAX_HOSTS] = { 7, 7, 7, 7, 7, 7, 7, 7 };

/* fill module-parameters only, when this define is present.
   (that is kernel version 2.1.x) */
#if defined(MODULE)
static char *boot_options = NULL;
module_param(boot_options, charp, 0);
module_param_array(io_port, int, NULL, 0);
module_param_array(scsi_id, int, NULL, 0);

MODULE_LICENSE("GPL");
#endif
/*counter of concurrent disk read/writes, to turn on/off disk led */
static int disk_rw_in_progress = 0;

static unsigned int pos[8];   /* whole pos register-line for diagnosis */
/* Taking into account the additions, made by ZP Gu.
 * This selects now the preset value from the configfile and
 * offers the 'normal' commandline option to be accepted */
#ifdef CONFIG_IBMMCA_SCSI_ORDER_STANDARD
static char ibm_ansi_order = 1;
#else
static char ibm_ansi_order = 0;
#endif

static void issue_cmd(struct Scsi_Host *, unsigned long, unsigned char);
static void internal_done(Scsi_Cmnd * cmd);
static void check_devices(struct Scsi_Host *, int);
static int immediate_assign(struct Scsi_Host *, unsigned int, unsigned int, unsigned int, unsigned int);
static int immediate_feature(struct Scsi_Host *, unsigned int, unsigned int);
#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
static int immediate_reset(struct Scsi_Host *, unsigned int);
#endif
static int device_inquiry(struct Scsi_Host *, int);
static int read_capacity(struct Scsi_Host *, int);
static int get_pos_info(struct Scsi_Host *);
static char *ti_p(int);
static char *ti_l(int);
static char *ibmrate(unsigned int, int);
static int probe_display(int);
static int probe_bus_mode(struct Scsi_Host *);
static int device_exists(struct Scsi_Host *, int, int *, int *);
static int option_setup(char *);
/* local functions needed for proc_info */
static int ldn_access_load(struct Scsi_Host *, int);
static int ldn_access_total_read_write(struct Scsi_Host *);

static irqreturn_t interrupt_handler(int irq, void *dev_id)
{
      unsigned int intr_reg;
      unsigned int cmd_result;
      unsigned int ldn;
      unsigned long flags;
      Scsi_Cmnd *cmd;
      int lastSCSI;
      struct device *dev = dev_id;
      struct Scsi_Host *shpnt = dev_get_drvdata(dev);

      spin_lock_irqsave(shpnt->host_lock, flags);

      if(!(inb(IM_STAT_REG(shpnt)) & IM_INTR_REQUEST)) {
            spin_unlock_irqrestore(shpnt->host_lock, flags);
            return IRQ_NONE;
      }

      /* the reset-function already did all the job, even ints got
         renabled on the subsystem, so just return */
      if ((reset_status(shpnt) == IM_RESET_NOT_IN_PROGRESS_NO_INT) || (reset_status(shpnt) == IM_RESET_FINISHED_OK_NO_INT)) {
            reset_status(shpnt) = IM_RESET_NOT_IN_PROGRESS;
            spin_unlock_irqrestore(shpnt->host_lock, flags);
            return IRQ_HANDLED;
      }

      /*must wait for attention reg not busy, then send EOI to subsystem */
      while (1) {
            if (!(inb(IM_STAT_REG(shpnt)) & IM_BUSY))
                  break;
            cpu_relax();
      }

      /*get command result and logical device */
      intr_reg = (unsigned char) (inb(IM_INTR_REG(shpnt)));
      cmd_result = intr_reg & 0xf0;
      ldn = intr_reg & 0x0f;
      /* get the last_scsi_command here */
      lastSCSI = last_scsi_command(shpnt)[ldn];
      outb(IM_EOI | ldn, IM_ATTN_REG(shpnt));
      
      /*these should never happen (hw fails, or a local programming bug) */
      if (!global_command_error_excuse) {
            switch (cmd_result) {
                  /* Prevent from Ooopsing on error to show the real reason */
            case IM_ADAPTER_HW_FAILURE:
            case IM_SOFTWARE_SEQUENCING_ERROR:
            case IM_CMD_ERROR:
                  printk(KERN_ERR "IBM MCA SCSI: Fatal Subsystem ERROR!\n");
                  printk(KERN_ERR "              Last cmd=0x%x, ena=%x, len=", lastSCSI, ld(shpnt)[ldn].scb.enable);
                  if (ld(shpnt)[ldn].cmd)
                        printk("%ld/%ld,", (long) (scsi_bufflen(ld(shpnt)[ldn].cmd)), (long) (ld(shpnt)[ldn].scb.sys_buf_length));
                  else
                        printk("none,");
                  if (ld(shpnt)[ldn].cmd)
                        printk("Blocksize=%d", ld(shpnt)[ldn].scb.u2.blk.length);
                  else
                        printk("Blocksize=none");
                  printk(", host=%p, ldn=0x%x\n", shpnt, ldn);
                  if (ld(shpnt)[ldn].cmd) {
                        printk(KERN_ERR "Blockcount=%d/%d\n", last_scsi_blockcount(shpnt)[ldn], ld(shpnt)[ldn].scb.u2.blk.count);
                        printk(KERN_ERR "Logical block=%lx/%lx\n", last_scsi_logical_block(shpnt)[ldn], ld(shpnt)[ldn].scb.u1.log_blk_adr);
                  }
                  printk(KERN_ERR "Reason given: %s\n", (cmd_result == IM_ADAPTER_HW_FAILURE) ? "HARDWARE FAILURE" : (cmd_result == IM_SOFTWARE_SEQUENCING_ERROR) ? "SOFTWARE SEQUENCING ERROR" : (cmd_result == IM_CMD_ERROR) ? "COMMAND ERROR" : "UNKNOWN");
                  /* if errors appear, enter this section to give detailed info */
                  printk(KERN_ERR "IBM MCA SCSI: Subsystem Error-Status follows:\n");
                  printk(KERN_ERR "              Command Type................: %x\n", last_scsi_type(shpnt)[ldn]);
                  printk(KERN_ERR "              Attention Register..........: %x\n", inb(IM_ATTN_REG(shpnt)));
                  printk(KERN_ERR "              Basic Control Register......: %x\n", inb(IM_CTR_REG(shpnt)));
                  printk(KERN_ERR "              Interrupt Status Register...: %x\n", intr_reg);
                  printk(KERN_ERR "              Basic Status Register.......: %x\n", inb(IM_STAT_REG(shpnt)));
                  if ((last_scsi_type(shpnt)[ldn] == IM_SCB) || (last_scsi_type(shpnt)[ldn] == IM_LONG_SCB)) {
                        printk(KERN_ERR "              SCB-Command.................: %x\n", ld(shpnt)[ldn].scb.command);
                        printk(KERN_ERR "              SCB-Enable..................: %x\n", ld(shpnt)[ldn].scb.enable);
                        printk(KERN_ERR "              SCB-logical block address...: %lx\n", ld(shpnt)[ldn].scb.u1.log_blk_adr);
                        printk(KERN_ERR "              SCB-system buffer address...: %lx\n", ld(shpnt)[ldn].scb.sys_buf_adr);
                        printk(KERN_ERR "              SCB-system buffer length....: %lx\n", ld(shpnt)[ldn].scb.sys_buf_length);
                        printk(KERN_ERR "              SCB-tsb address.............: %lx\n", ld(shpnt)[ldn].scb.tsb_adr);
                        printk(KERN_ERR "              SCB-Chain address...........: %lx\n", ld(shpnt)[ldn].scb.scb_chain_adr);
                        printk(KERN_ERR "              SCB-block count.............: %x\n", ld(shpnt)[ldn].scb.u2.blk.count);
                        printk(KERN_ERR "              SCB-block length............: %x\n", ld(shpnt)[ldn].scb.u2.blk.length);
                  }
                  printk(KERN_ERR "              Send this report to the maintainer.\n");
                  panic("IBM MCA SCSI: Fatal error message from the subsystem (0x%X,0x%X)!\n", lastSCSI, cmd_result);
                  break;
            }
      } else {
            /* The command error handling is made silent, but we tell the
             * calling function, that there is a reported error from the
             * adapter. */
            switch (cmd_result) {
            case IM_ADAPTER_HW_FAILURE:
            case IM_SOFTWARE_SEQUENCING_ERROR:
            case IM_CMD_ERROR:
                  global_command_error_excuse = CMD_FAIL;
                  break;
            default:
                  global_command_error_excuse = 0;
                  break;
            }
      }
      /* if no panic appeared, increase the interrupt-counter */
      IBM_DS(shpnt).total_interrupts++;
      /*only for local checking phase */
      if (local_checking_phase_flag(shpnt)) {
            stat_result(shpnt) = cmd_result;
            got_interrupt(shpnt) = 1;
            reset_status(shpnt) = IM_RESET_FINISHED_OK;
            last_scsi_command(shpnt)[ldn] = NO_SCSI;
            spin_unlock_irqrestore(shpnt->host_lock, flags);
            return IRQ_HANDLED;
      }
      /* handling of commands coming from upper level of scsi driver */
      if (last_scsi_type(shpnt)[ldn] == IM_IMM_CMD) {
            /* verify ldn, and may handle rare reset immediate command */
            if ((reset_status(shpnt) == IM_RESET_IN_PROGRESS) && (last_scsi_command(shpnt)[ldn] == IM_RESET_IMM_CMD)) {
                  if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
                        disk_rw_in_progress = 0;
                        PS2_DISK_LED_OFF();
                        reset_status(shpnt) = IM_RESET_FINISHED_FAIL;
                  } else {
                        /*reset disk led counter, turn off disk led */
                        disk_rw_in_progress = 0;
                        PS2_DISK_LED_OFF();
                        reset_status(shpnt) = IM_RESET_FINISHED_OK;
                  }
                  stat_result(shpnt) = cmd_result;
                  last_scsi_command(shpnt)[ldn] = NO_SCSI;
                  last_scsi_type(shpnt)[ldn] = 0;
                  spin_unlock_irqrestore(shpnt->host_lock, flags);
                  return IRQ_HANDLED;
            } else if (last_scsi_command(shpnt)[ldn] == IM_ABORT_IMM_CMD) {
                  /* react on SCSI abort command */
#ifdef IM_DEBUG_PROBE
                  printk("IBM MCA SCSI: Interrupt from SCSI-abort.\n");
#endif
                  disk_rw_in_progress = 0;
                  PS2_DISK_LED_OFF();
                  cmd = ld(shpnt)[ldn].cmd;
                  ld(shpnt)[ldn].cmd = NULL;
                  if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE)
                        cmd->result = DID_NO_CONNECT << 16;
                  else
                        cmd->result = DID_ABORT << 16;
                  stat_result(shpnt) = cmd_result;
                  last_scsi_command(shpnt)[ldn] = NO_SCSI;
                  last_scsi_type(shpnt)[ldn] = 0;
                  if (cmd->scsi_done)
                        (cmd->scsi_done) (cmd); /* should be the internal_done */
                  spin_unlock_irqrestore(shpnt->host_lock, flags);
                  return IRQ_HANDLED;
            } else {
                  disk_rw_in_progress = 0;
                  PS2_DISK_LED_OFF();
                  reset_status(shpnt) = IM_RESET_FINISHED_OK;
                  stat_result(shpnt) = cmd_result;
                  last_scsi_command(shpnt)[ldn] = NO_SCSI;
                  spin_unlock_irqrestore(shpnt->host_lock, flags);
                  return IRQ_HANDLED;
            }
      }
      last_scsi_command(shpnt)[ldn] = NO_SCSI;
      last_scsi_type(shpnt)[ldn] = 0;
      cmd = ld(shpnt)[ldn].cmd;
      ld(shpnt)[ldn].cmd = NULL;
#ifdef IM_DEBUG_TIMEOUT
      if (cmd) {
            if ((cmd->target == TIMEOUT_PUN) && (cmd->device->lun == TIMEOUT_LUN)) {
                  spin_unlock_irqsave(shpnt->host_lock, flags);
                  printk("IBM MCA SCSI: Ignoring interrupt from pun=%x, lun=%x.\n", cmd->target, cmd->device->lun);
                  return IRQ_HANDLED;
            }
      }
#endif
      /*if no command structure, just return, else clear cmd */
      if (!cmd)
      {
            spin_unlock_irqrestore(shpnt->host_lock, flags);
            return IRQ_HANDLED;
      }

#ifdef IM_DEBUG_INT
      printk("cmd=%02x ireg=%02x ds=%02x cs=%02x de=%02x ce=%02x\n", cmd->cmnd[0], intr_reg, ld(shpnt)[ldn].tsb.dev_status, ld(shpnt)[ldn].tsb.cmd_status, ld(shpnt)[ldn].tsb.dev_error, ld(shpnt)[ldn].tsb.cmd_error);
#endif
      /*if this is end of media read/write, may turn off PS/2 disk led */
      if ((ld(shpnt)[ldn].device_type != TYPE_NO_LUN) && (ld(shpnt)[ldn].device_type != TYPE_NO_DEVICE)) {
            /* only access this, if there was a valid device addressed */
            if (--disk_rw_in_progress == 0)
                  PS2_DISK_LED_OFF();
      }

      /* IBM describes the status-mask to be 0x1e, but this is not conform
       * with SCSI-definition, I suppose, the reason for it is that IBM
       * adapters do not support CMD_TERMINATED, TASK_SET_FULL and
       * ACA_ACTIVE as returning statusbyte information. (ML) */
      if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
            cmd->result = (unsigned char) (ld(shpnt)[ldn].tsb.dev_status & 0x1e);
            IBM_DS(shpnt).total_errors++;
      } else
            cmd->result = 0;
      /* write device status into cmd->result, and call done function */
      if (lastSCSI == NO_SCSI) {    /* unexpected interrupt :-( */
            cmd->result |= DID_BAD_INTR << 16;
            printk("IBM MCA SCSI: WARNING - Interrupt from non-pending SCSI-command!\n");
      } else                  /* things went right :-) */
            cmd->result |= DID_OK << 16;
      if (cmd->scsi_done)
            (cmd->scsi_done) (cmd);
      spin_unlock_irqrestore(shpnt->host_lock, flags);
      return IRQ_HANDLED;
}

static void issue_cmd(struct Scsi_Host *shpnt, unsigned long cmd_reg,
                  unsigned char attn_reg)
{
      unsigned long flags;
      /* must wait for attention reg not busy */
      while (1) {
            spin_lock_irqsave(shpnt->host_lock, flags);
            if (!(inb(IM_STAT_REG(shpnt)) & IM_BUSY))
                  break;
            spin_unlock_irqrestore(shpnt->host_lock, flags);
      }
      /* write registers and enable system interrupts */
      outl(cmd_reg, IM_CMD_REG(shpnt));
      outb(attn_reg, IM_ATTN_REG(shpnt));
      spin_unlock_irqrestore(shpnt->host_lock, flags);
}

static void internal_done(Scsi_Cmnd * cmd)
{
      cmd->SCp.Status++;
      return;
}

/* SCSI-SCB-command for device_inquiry */
static int device_inquiry(struct Scsi_Host *shpnt, int ldn)
{
      int retr;
      struct im_scb *scb;
      struct im_tsb *tsb;
      unsigned char *buf;

      scb = &(ld(shpnt)[ldn].scb);
      tsb = &(ld(shpnt)[ldn].tsb);
      buf = (unsigned char *) (&(ld(shpnt)[ldn].buf));
      ld(shpnt)[ldn].tsb.dev_status = 0;  /* prepare statusblock */
      for (retr = 0; retr < 3; retr++) {
            /* fill scb with inquiry command */
            scb->command = IM_DEVICE_INQUIRY_CMD | IM_NO_DISCONNECT;
            scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
            last_scsi_command(shpnt)[ldn] = IM_DEVICE_INQUIRY_CMD;
            last_scsi_type(shpnt)[ldn] = IM_SCB;
            scb->sys_buf_adr = isa_virt_to_bus(buf);
            scb->sys_buf_length = 255;    /* maximum bufferlength gives max info */
            scb->tsb_adr = isa_virt_to_bus(tsb);
            /* issue scb to passed ldn, and busy wait for interrupt */
            got_interrupt(shpnt) = 0;
            issue_cmd(shpnt, isa_virt_to_bus(scb), IM_SCB | ldn);
            while (!got_interrupt(shpnt))
                  barrier();

            /*if command successful, break */
            if ((stat_result(shpnt) == IM_SCB_CMD_COMPLETED) || (stat_result(shpnt) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
                  return 1;
      }
      /*if all three retries failed, return "no device at this ldn" */
      if (retr >= 3)
            return 0;
      else
            return 1;
}

static int read_capacity(struct Scsi_Host *shpnt, int ldn)
{
      int retr;
      struct im_scb *scb;
      struct im_tsb *tsb;
      unsigned char *buf;

      scb = &(ld(shpnt)[ldn].scb);
      tsb = &(ld(shpnt)[ldn].tsb);
      buf = (unsigned char *) (&(ld(shpnt)[ldn].buf));
      ld(shpnt)[ldn].tsb.dev_status = 0;
      for (retr = 0; retr < 3; retr++) {
            /*fill scb with read capacity command */
            scb->command = IM_READ_CAPACITY_CMD;
            scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
            last_scsi_command(shpnt)[ldn] = IM_READ_CAPACITY_CMD;
            last_scsi_type(shpnt)[ldn] = IM_SCB;
            scb->sys_buf_adr = isa_virt_to_bus(buf);
            scb->sys_buf_length = 8;
            scb->tsb_adr = isa_virt_to_bus(tsb);
            /*issue scb to passed ldn, and busy wait for interrupt */
            got_interrupt(shpnt) = 0;
            issue_cmd(shpnt, isa_virt_to_bus(scb), IM_SCB | ldn);
            while (!got_interrupt(shpnt))
                  barrier();

            /*if got capacity, get block length and return one device found */
            if ((stat_result(shpnt) == IM_SCB_CMD_COMPLETED) || (stat_result(shpnt) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
                  return 1;
      }
      /*if all three retries failed, return "no device at this ldn" */
      if (retr >= 3)
            return 0;
      else
            return 1;
}

static int get_pos_info(struct Scsi_Host *shpnt)
{
      int retr;
      struct im_scb *scb;
      struct im_tsb *tsb;
      unsigned char *buf;

      scb = &(ld(shpnt)[MAX_LOG_DEV].scb);
      tsb = &(ld(shpnt)[MAX_LOG_DEV].tsb);
      buf = (unsigned char *) (&(ld(shpnt)[MAX_LOG_DEV].buf));
      ld(shpnt)[MAX_LOG_DEV].tsb.dev_status = 0;
      for (retr = 0; retr < 3; retr++) {
            /*fill scb with get_pos_info command */
            scb->command = IM_GET_POS_INFO_CMD;
            scb->enable = IM_READ_CONTROL | IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
            last_scsi_command(shpnt)[MAX_LOG_DEV] = IM_GET_POS_INFO_CMD;
            last_scsi_type(shpnt)[MAX_LOG_DEV] = IM_SCB;
            scb->sys_buf_adr = isa_virt_to_bus(buf);
            if (special(shpnt) == IBM_SCSI2_FW)
                  scb->sys_buf_length = 256;    /* get all info from F/W adapter */
            else
                  scb->sys_buf_length = 18;     /* get exactly 18 bytes for other SCSI */
            scb->tsb_adr = isa_virt_to_bus(tsb);
            /*issue scb to ldn=15, and busy wait for interrupt */
            got_interrupt(shpnt) = 0;
            issue_cmd(shpnt, isa_virt_to_bus(scb), IM_SCB | MAX_LOG_DEV);
            
            /* FIXME: timeout */
            while (!got_interrupt(shpnt))
                  barrier();

            /*if got POS-stuff, get block length and return one device found */
            if ((stat_result(shpnt) == IM_SCB_CMD_COMPLETED) || (stat_result(shpnt) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
                  return 1;
      }
      /* if all three retries failed, return "no device at this ldn" */
      if (retr >= 3)
            return 0;
      else
            return 1;
}

/* SCSI-immediate-command for assign. This functions maps/unmaps specific
 ldn-numbers on SCSI (PUN,LUN). It is needed for presetting of the
 subsystem and for dynamical remapping od ldns. */
static int immediate_assign(struct Scsi_Host *shpnt, unsigned int pun,
                      unsigned int lun, unsigned int ldn,
                      unsigned int operation)
{
      int retr;
      unsigned long imm_cmd;

      for (retr = 0; retr < 3; retr++) {
            /* select mutation level of the SCSI-adapter */
            switch (special(shpnt)) {
            case IBM_SCSI2_FW:
                  imm_cmd = (unsigned long) (IM_ASSIGN_IMM_CMD);
                  imm_cmd |= (unsigned long) ((lun & 7) << 24);
                  imm_cmd |= (unsigned long) ((operation & 1) << 23);
                  imm_cmd |= (unsigned long) ((pun & 7) << 20) | ((pun & 8) << 24);
                  imm_cmd |= (unsigned long) ((ldn & 15) << 16);
                  break;
            default:
                  imm_cmd = inl(IM_CMD_REG(shpnt));
                  imm_cmd &= (unsigned long) (0xF8000000);  /* keep reserved bits */
                  imm_cmd |= (unsigned long) (IM_ASSIGN_IMM_CMD);
                  imm_cmd |= (unsigned long) ((lun & 7) << 24);
                  imm_cmd |= (unsigned long) ((operation & 1) << 23);
                  imm_cmd |= (unsigned long) ((pun & 7) << 20);
                  imm_cmd |= (unsigned long) ((ldn & 15) << 16);
                  break;
            }
            last_scsi_command(shpnt)[MAX_LOG_DEV] = IM_ASSIGN_IMM_CMD;
            last_scsi_type(shpnt)[MAX_LOG_DEV] = IM_IMM_CMD;
            got_interrupt(shpnt) = 0;
            issue_cmd(shpnt, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
            while (!got_interrupt(shpnt))
                  barrier();

            /*if command successful, break */
            if (stat_result(shpnt) == IM_IMMEDIATE_CMD_COMPLETED)
                  return 1;
      }
      if (retr >= 3)
            return 0;
      else
            return 1;
}

static int immediate_feature(struct Scsi_Host *shpnt, unsigned int speed, unsigned int timeout)
{
      int retr;
      unsigned long imm_cmd;

      for (retr = 0; retr < 3; retr++) {
            /* select mutation level of the SCSI-adapter */
            imm_cmd = IM_FEATURE_CTR_IMM_CMD;
            imm_cmd |= (unsigned long) ((speed & 0x7) << 29);
            imm_cmd |= (unsigned long) ((timeout & 0x1fff) << 16);
            last_scsi_command(shpnt)[MAX_LOG_DEV] = IM_FEATURE_CTR_IMM_CMD;
            last_scsi_type(shpnt)[MAX_LOG_DEV] = IM_IMM_CMD;
            got_interrupt(shpnt) = 0;
            /* we need to run into command errors in order to probe for the
             * right speed! */
            global_command_error_excuse = 1;
            issue_cmd(shpnt, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
            
            /* FIXME: timeout */
            while (!got_interrupt(shpnt))
                  barrier();
            if (global_command_error_excuse == CMD_FAIL) {
                  global_command_error_excuse = 0;
                  return 2;
            } else
                  global_command_error_excuse = 0;
            /*if command successful, break */
            if (stat_result(shpnt) == IM_IMMEDIATE_CMD_COMPLETED)
                  return 1;
      }
      if (retr >= 3)
            return 0;
      else
            return 1;
}

#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
static int immediate_reset(struct Scsi_Host *shpnt, unsigned int ldn)
{
      int retries;
      int ticks;
      unsigned long imm_command;

      for (retries = 0; retries < 3; retries++) {
            imm_command = inl(IM_CMD_REG(shpnt));
            imm_command &= (unsigned long) (0xFFFF0000);    /* keep reserved bits */
            imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
            last_scsi_command(shpnt)[ldn] = IM_RESET_IMM_CMD;
            last_scsi_type(shpnt)[ldn] = IM_IMM_CMD;
            got_interrupt(shpnt) = 0;
            reset_status(shpnt) = IM_RESET_IN_PROGRESS;
            issue_cmd(shpnt, (unsigned long) (imm_command), IM_IMM_CMD | ldn);
            ticks = IM_RESET_DELAY * HZ;
            while (reset_status(shpnt) == IM_RESET_IN_PROGRESS && --ticks) {
                  udelay((1 + 999 / HZ) * 1000);
                  barrier();
            }
            /* if reset did not complete, just complain */
            if (!ticks) {
                  printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
                  reset_status(shpnt) = IM_RESET_FINISHED_OK;
                  /* did not work, finish */
                  return 1;
            }
            /*if command successful, break */
            if (stat_result(shpnt) == IM_IMMEDIATE_CMD_COMPLETED)
                  return 1;
      }
      if (retries >= 3)
            return 0;
      else
            return 1;
}
#endif

/* type-interpreter for physical device numbers */
static char *ti_p(int dev)
{
      switch (dev) {
      case TYPE_IBM_SCSI_ADAPTER:
            return ("A");
      case TYPE_DISK:
            return ("D");
      case TYPE_TAPE:
            return ("T");
      case TYPE_PROCESSOR:
            return ("P");
      case TYPE_WORM:
            return ("W");
      case TYPE_ROM:
            return ("R");
      case TYPE_SCANNER:
            return ("S");
      case TYPE_MOD:
            return ("M");
      case TYPE_MEDIUM_CHANGER:
            return ("C");
      case TYPE_NO_LUN:
            return ("+");     /* show NO_LUN */
      }
      return ("-");           /* TYPE_NO_DEVICE and others */
}

/* interpreter for logical device numbers (ldn) */
static char *ti_l(int val)
{
      const char hex[16] = "0123456789abcdef";
      static char answer[2];

      answer[1] = (char) (0x0);
      if (val <= MAX_LOG_DEV)
            answer[0] = hex[val];
      else
            answer[0] = '-';
      return (char *) &answer;
}

/* transfers bitpattern of the feature command to values in MHz */
static char *ibmrate(unsigned int speed, int i)
{
      switch (speed) {
      case 0:
            return i ? "5.00" : "10.00";
      case 1:
            return i ? "4.00" : "8.00";
      case 2:
            return i ? "3.33" : "6.66";
      case 3:
            return i ? "2.86" : "5.00";
      case 4:
            return i ? "2.50" : "4.00";
      case 5:
            return i ? "2.22" : "3.10";
      case 6:
            return i ? "2.00" : "2.50";
      case 7:
            return i ? "1.82" : "2.00";
      }
      return "---";
}

static int probe_display(int what)
{
      static int rotator = 0;
      const char rotor[] = "|/-\\";

      if (!(display_mode & LED_DISP))
            return 0;
      if (!what) {
            outl(0x20202020, MOD95_LED_PORT);
            outl(0x20202020, MOD95_LED_PORT + 4);
      } else {
            outb('S', MOD95_LED_PORT + 7);
            outb('C', MOD95_LED_PORT + 6);
            outb('S', MOD95_LED_PORT + 5);
            outb('I', MOD95_LED_PORT + 4);
            outb('i', MOD95_LED_PORT + 3);
            outb('n', MOD95_LED_PORT + 2);
            outb('i', MOD95_LED_PORT + 1);
            outb((char) (rotor[rotator]), MOD95_LED_PORT);
            rotator++;
            if (rotator > 3)
                  rotator = 0;
      }
      return 0;
}

static int probe_bus_mode(struct Scsi_Host *shpnt)
{
      struct im_pos_info *info;
      int num_bus = 0;
      int ldn;

      info = (struct im_pos_info *) (&(ld(shpnt)[MAX_LOG_DEV].buf));
      if (get_pos_info(shpnt)) {
            if (info->connector_size & 0xf000)
                  subsystem_connector_size(shpnt) = 16;
            else
                  subsystem_connector_size(shpnt) = 32;
            num_bus |= (info->pos_4b & 8) >> 3;
            for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
                  if ((special(shpnt) == IBM_SCSI_WCACHE) || (special(shpnt) == IBM_7568_WCACHE)) {
                        if (!((info->cache_stat >> ldn) & 1))
                              ld(shpnt)[ldn].cache_flag = 0;
                  }
                  if (!((info->retry_stat >> ldn) & 1))
                        ld(shpnt)[ldn].retry_flag = 0;
            }
#ifdef IM_DEBUG_PROBE
            printk("IBM MCA SCSI: SCSI-Cache bits: ");
            for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
                  printk("%d", ld(shpnt)[ldn].cache_flag);
            }
            printk("\nIBM MCA SCSI: SCSI-Retry bits: ");
            for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
                  printk("%d", ld(shpnt)[ldn].retry_flag);
            }
            printk("\n");
#endif
      }
      return num_bus;
}

/* probing scsi devices */
static void check_devices(struct Scsi_Host *shpnt, int adaptertype)
{
      int id, lun, ldn, ticks;
      int count_devices;      /* local counter for connected device */
      int max_pun;
      int num_bus;
      int speedrun;           /* local adapter_speed check variable */

      /* assign default values to certain variables */
      ticks = 0;
      count_devices = 0;
      IBM_DS(shpnt).dyn_flag = 0;   /* normally no need for dynamical ldn management */
      IBM_DS(shpnt).total_errors = 0;     /* set errorcounter to 0 */
      next_ldn(shpnt) = 7;    /* next ldn to be assigned is 7, because 0-6 is 'hardwired' */

      /* initialize the very important driver-informational arrays/structs */
      memset(ld(shpnt), 0, sizeof(ld(shpnt)));
      for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
            last_scsi_command(shpnt)[ldn] = NO_SCSI;  /* emptify last SCSI-command storage */
            last_scsi_type(shpnt)[ldn] = 0;
            ld(shpnt)[ldn].cache_flag = 1;
            ld(shpnt)[ldn].retry_flag = 1;
      }
      memset(get_ldn(shpnt), TYPE_NO_DEVICE, sizeof(get_ldn(shpnt)));   /* this is essential ! */
      memset(get_scsi(shpnt), TYPE_NO_DEVICE, sizeof(get_scsi(shpnt))); /* this is essential ! */
      for (lun = 0; lun < 8; lun++) {
            /* mark the adapter at its pun on all luns */
            get_scsi(shpnt)[subsystem_pun(shpnt)][lun] = TYPE_IBM_SCSI_ADAPTER;
            get_ldn(shpnt)[subsystem_pun(shpnt)][lun] = MAX_LOG_DEV;    /* make sure, the subsystem
                                                                     ldn is active for all
                                                                     luns. */
      }
      probe_display(0); /* Supercool display usage during SCSI-probing. */
      /* This makes sense, when booting without any */
      /* monitor connected on model XX95. */

      /* STEP 1: */
      adapter_speed(shpnt) = global_adapter_speed;
      speedrun = adapter_speed(shpnt);
      while (immediate_feature(shpnt, speedrun, adapter_timeout) == 2) {
            probe_display(1);
            if (speedrun == 7)
                  panic("IBM MCA SCSI: Cannot set Synchronous-Transfer-Rate!\n");
            speedrun++;
            if (speedrun > 7)
                  speedrun = 7;
      }
      adapter_speed(shpnt) = speedrun;
      /* Get detailed information about the current adapter, necessary for
       * device operations: */
      num_bus = probe_bus_mode(shpnt);

      /* num_bus contains only valid data for the F/W adapter! */
      if (adaptertype == IBM_SCSI2_FW) {  /* F/W SCSI adapter: */
            /* F/W adapter PUN-space extension evaluation: */
            if (num_bus) {
                  printk(KERN_INFO "IBM MCA SCSI: Separate bus mode (wide-addressing enabled)\n");
                  subsystem_maxid(shpnt) = 16;
            } else {
                  printk(KERN_INFO "IBM MCA SCSI: Combined bus mode (wide-addressing disabled)\n");
                  subsystem_maxid(shpnt) = 8;
            }
            printk(KERN_INFO "IBM MCA SCSI: Sync.-Rate (F/W: 20, Int.: 10, Ext.: %s) MBytes/s\n", ibmrate(speedrun, adaptertype));
      } else                  /* all other IBM SCSI adapters: */
            printk(KERN_INFO "IBM MCA SCSI: Synchronous-SCSI-Transfer-Rate: %s MBytes/s\n", ibmrate(speedrun, adaptertype));

      /* assign correct PUN device space */
      max_pun = subsystem_maxid(shpnt);

#ifdef IM_DEBUG_PROBE
      printk("IBM MCA SCSI: Current SCSI-host index: %d\n", shpnt);
      printk("IBM MCA SCSI: Removing default logical SCSI-device mapping.");
#else
      printk(KERN_INFO "IBM MCA SCSI: Dev. Order: %s, Mapping (takes <2min): ", (ibm_ansi_order) ? "ANSI" : "New");
#endif
      for (ldn = 0; ldn < MAX_LOG_DEV; ldn++) {
            probe_display(1);
#ifdef IM_DEBUG_PROBE
            printk(".");
#endif
            immediate_assign(shpnt, 0, 0, ldn, REMOVE_LDN); /* remove ldn (wherever) */
      }
      lun = 0;          /* default lun is 0 */
#ifndef IM_DEBUG_PROBE
      printk("cleared,");
#endif
      /* STEP 2: */
#ifdef IM_DEBUG_PROBE
      printk("\nIBM MCA SCSI: Scanning SCSI-devices.");
#endif
      for (id = 0; id < max_pun; id++)
#ifdef CONFIG_SCSI_MULTI_LUN
            for (lun = 0; lun < 8; lun++)
#endif
            {
                  probe_display(1);
#ifdef IM_DEBUG_PROBE
                  printk(".");
#endif
                  if (id != subsystem_pun(shpnt)) {
                        /* if pun is not the adapter: */
                        /* set ldn=0 to pun,lun */
                        immediate_assign(shpnt, id, lun, PROBE_LDN, SET_LDN);
                        if (device_inquiry(shpnt, PROBE_LDN)) {   /* probe device */
                              get_scsi(shpnt)[id][lun] = (unsigned char) (ld(shpnt)[PROBE_LDN].buf[0]);
                              /* entry, even for NO_LUN */
                              if (ld(shpnt)[PROBE_LDN].buf[0] != TYPE_NO_LUN)
                                    count_devices++;  /* a existing device is found */
                        }
                        /* remove ldn */
                        immediate_assign(shpnt, id, lun, PROBE_LDN, REMOVE_LDN);
                  }
            }
#ifndef IM_DEBUG_PROBE
      printk("scanned,");
#endif
      /* STEP 3: */
#ifdef IM_DEBUG_PROBE
      printk("\nIBM MCA SCSI: Mapping SCSI-devices.");
#endif
      ldn = 0;
      lun = 0;
#ifdef CONFIG_SCSI_MULTI_LUN
      for (lun = 0; lun < 8 && ldn < MAX_LOG_DEV; lun++)
#endif
            for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
                  probe_display(1);
#ifdef IM_DEBUG_PROBE
                  printk(".");
#endif
                  if (id != subsystem_pun(shpnt)) {
                        if (get_scsi(shpnt)[id][lun] != TYPE_NO_LUN && get_scsi(shpnt)[id][lun] != TYPE_NO_DEVICE) {
                              /* Only map if accepted type. Always enter for
                                 lun == 0 to get no gaps into ldn-mapping for ldn<7. */
                              immediate_assign(shpnt, id, lun, ldn, SET_LDN);
                              get_ldn(shpnt)[id][lun] = ldn;      /* map ldn */
                              if (device_exists(shpnt, ldn, &ld(shpnt)[ldn].block_length, &ld(shpnt)[ldn].device_type)) {
#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
                                    printk("resetting device at ldn=%x ... ", ldn);
                                    immediate_reset(shpnt, ldn);
#endif
                                    ldn++;
                              } else {
                                    /* device vanished, probably because we don't know how to
                                     * handle it or because it has problems */
                                    if (lun > 0) {
                                          /* remove mapping */
                                          get_ldn(shpnt)[id][lun] = TYPE_NO_DEVICE;
                                          immediate_assign(shpnt, 0, 0, ldn, REMOVE_LDN);
                                    } else
                                          ldn++;
                              }
                        } else if (lun == 0) {
                              /* map lun == 0, even if no device exists */
                              immediate_assign(shpnt, id, lun, ldn, SET_LDN);
                              get_ldn(shpnt)[id][lun] = ldn;      /* map ldn */
                              ldn++;
                        }
                  }
            }
      /* STEP 4: */

      /* map remaining ldns to non-existing devices */
      for (lun = 1; lun < 8 && ldn < MAX_LOG_DEV; lun++)
            for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
                  if (get_scsi(shpnt)[id][lun] == TYPE_NO_LUN || get_scsi(shpnt)[id][lun] == TYPE_NO_DEVICE) {
                        probe_display(1);
                        /* Map remaining ldns only to NON-existing pun,lun
                           combinations to make sure an inquiry will fail.
                           For MULTI_LUN, it is needed to avoid adapter autonome
                           SCSI-remapping. */
                        immediate_assign(shpnt, id, lun, ldn, SET_LDN);
                        get_ldn(shpnt)[id][lun] = ldn;
                        ldn++;
                  }
            }
#ifndef IM_DEBUG_PROBE
      printk("mapped.");
#endif
      printk("\n");
#ifdef IM_DEBUG_PROBE
      if (ibm_ansi_order)
            printk("IBM MCA SCSI: Device order: IBM/ANSI (pun=7 is first).\n");
      else
            printk("IBM MCA SCSI: Device order: New Industry Standard (pun=0 is first).\n");
#endif

#ifdef IM_DEBUG_PROBE
      /* Show the physical and logical mapping during boot. */
      printk("IBM MCA SCSI: Determined SCSI-device-mapping:\n");
      printk("    Physical SCSI-Device Map               Logical SCSI-Device Map\n");
      printk("ID\\LUN  0  1  2  3  4  5  6  7       ID\\LUN  0  1  2  3  4  5  6  7\n");
      for (id = 0; id < max_pun; id++) {
            printk("%2d     ", id);
            for (lun = 0; lun < 8; lun++)
                  printk("%2s ", ti_p(get_scsi(shpnt)[id][lun]));
            printk("      %2d     ", id);
            for (lun = 0; lun < 8; lun++)
                  printk("%2s ", ti_l(get_ldn(shpnt)[id][lun]));
            printk("\n");
      }
#endif

      /* assign total number of found SCSI-devices to the statistics struct */
      IBM_DS(shpnt).total_scsi_devices = count_devices;

      /* decide for output in /proc-filesystem, if the configuration of
         SCSI-devices makes dynamical reassignment of devices necessary */
      if (count_devices >= MAX_LOG_DEV)
            IBM_DS(shpnt).dyn_flag = 1;   /* dynamical assignment is necessary */
      else
            IBM_DS(shpnt).dyn_flag = 0;   /* dynamical assignment is not necessary */

      /* If no SCSI-devices are assigned, return 1 in order to cause message. */
      if (ldn == 0)
            printk("IBM MCA SCSI: Warning: No SCSI-devices found/assigned!\n");

      /* reset the counters for statistics on the current adapter */
      IBM_DS(shpnt).scbs = 0;
      IBM_DS(shpnt).long_scbs = 0;
      IBM_DS(shpnt).total_accesses = 0;
      IBM_DS(shpnt).total_interrupts = 0;
      IBM_DS(shpnt).dynamical_assignments = 0;
      memset(IBM_DS(shpnt).ldn_access, 0x0, sizeof(IBM_DS(shpnt).ldn_access));
      memset(IBM_DS(shpnt).ldn_read_access, 0x0, sizeof(IBM_DS(shpnt).ldn_read_access));
      memset(IBM_DS(shpnt).ldn_write_access, 0x0, sizeof(IBM_DS(shpnt).ldn_write_access));
      memset(IBM_DS(shpnt).ldn_inquiry_access, 0x0, sizeof(IBM_DS(shpnt).ldn_inquiry_access));
      memset(IBM_DS(shpnt).ldn_modeselect_access, 0x0, sizeof(IBM_DS(shpnt).ldn_modeselect_access));
      memset(IBM_DS(shpnt).ldn_assignments, 0x0, sizeof(IBM_DS(shpnt).ldn_assignments));
      probe_display(0);
      return;
}

static int device_exists(struct Scsi_Host *shpnt, int ldn, int *block_length, int *device_type)
{
      unsigned char *buf;
      /* if no valid device found, return immediately with 0 */
      if (!(device_inquiry(shpnt, ldn)))
            return 0;
      buf = (unsigned char *) (&(ld(shpnt)[ldn].buf));
      if (*buf == TYPE_ROM) {
            *device_type = TYPE_ROM;
            *block_length = 2048;   /* (standard blocksize for yellow-/red-book) */
            return 1;
      }
      if (*buf == TYPE_WORM) {
            *device_type = TYPE_WORM;
            *block_length = 2048;
            return 1;
      }
      if (*buf == TYPE_DISK) {
            *device_type = TYPE_DISK;
            if (read_capacity(shpnt, ldn)) {
                  *block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
                  return 1;
            } else
                  return 0;
      }
      if (*buf == TYPE_MOD) {
            *device_type = TYPE_MOD;
            if (read_capacity(shpnt, ldn)) {
                  *block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
                  return 1;
            } else
                  return 0;
      }
      if (*buf == TYPE_TAPE) {
            *device_type = TYPE_TAPE;
            *block_length = 0;      /* not in use (setting by mt and mtst in op.) */
            return 1;
      }
      if (*buf == TYPE_PROCESSOR) {
            *device_type = TYPE_PROCESSOR;
            *block_length = 0;      /* they set their stuff on drivers */
            return 1;
      }
      if (*buf == TYPE_SCANNER) {
            *device_type = TYPE_SCANNER;
            *block_length = 0;      /* they set their stuff on drivers */
            return 1;
      }
      if (*buf == TYPE_MEDIUM_CHANGER) {
            *device_type = TYPE_MEDIUM_CHANGER;
            *block_length = 0;      /* One never knows, what to expect on a medium
                                 changer device. */
            return 1;
      }
      return 0;
}

static void internal_ibmmca_scsi_setup(char *str, int *ints)
{
      int i, j, io_base, id_base;
      char *token;

      io_base = 0;
      id_base = 0;
      if (str) {
            j = 0;
            while ((token = strsep(&str, ",")) != NULL) {
                  if (!strcmp(token, "activity"))
                        display_mode |= LED_ACTIVITY;
                  if (!strcmp(token, "display"))
                        display_mode |= LED_DISP;
                  if (!strcmp(token, "adisplay"))
                        display_mode |= LED_ADISP;
                  if (!strcmp(token, "normal"))
                        ibm_ansi_order = 0;
                  if (!strcmp(token, "ansi"))
                        ibm_ansi_order = 1;
                  if (!strcmp(token, "fast"))
                        global_adapter_speed = 0;
                  if (!strcmp(token, "medium"))
                        global_adapter_speed = 4;
                  if (!strcmp(token, "slow"))
                        global_adapter_speed = 7;
                  if ((*token == '-') || (isdigit(*token))) {
                        if (!(j % 2) && (io_base < IM_MAX_HOSTS))
                              io_port[io_base++] = simple_strtoul(token, NULL, 0);
                        if ((j % 2) && (id_base < IM_MAX_HOSTS))
                              scsi_id[id_base++] = simple_strtoul(token, NULL, 0);
                        j++;
                  }
            }
      } else if (ints) {
            for (i = 0; i < IM_MAX_HOSTS && 2 * i + 2 < ints[0]; i++) {
                  io_port[i] = ints[2 * i + 2];
                  scsi_id[i] = ints[2 * i + 2];
            }
      }
      return;
}

#if 0
 FIXME NEED TO MOVE TO SYSFS

static int ibmmca_getinfo(char *buf, int slot, void *dev_id)
{
      struct Scsi_Host *shpnt;
      int len, speciale, connectore, k;
      unsigned int pos[8];
      unsigned long flags;
      struct Scsi_Host *dev = dev_id;

      spin_lock_irqsave(dev->host_lock, flags);

      shpnt = dev;            /* assign host-structure to local pointer */
      len = 0;          /* set filled text-buffer index to 0 */
      /* get the _special contents of the hostdata structure */
      speciale = ((struct ibmmca_hostdata *) shpnt->hostdata)->_special;
      connectore = ((struct ibmmca_hostdata *) shpnt->hostdata)->_connector_size;
      for (k = 2; k < 4; k++)
            pos[k] = ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k];
      if (speciale == FORCED_DETECTION) { /* forced detection */
            len += sprintf(buf + len,
                         "Adapter category: forced detected\n" "***************************************\n" "***  Forced detected SCSI Adapter   ***\n" "***  No chip-information available  ***\n" "***************************************\n");
      } else if (speciale == INTEGRATED_SCSI) {
            /* if the integrated subsystem has been found automatically: */
            len += sprintf(buf + len,
                         "Adapter category: integrated\n" "Chip revision level: %d\n" "Chip status: %s\n" "8 kByte NVRAM status: %s\n", ((pos[2] & 0xf0) >> 4), (pos[2] & 1) ? "enabled" : "disabled", (pos[2] & 2) ? "locked" : "accessible");
      } else if ((speciale >= 0) && (speciale < ARRAY_SIZE(subsys_list))) {
            /* if the subsystem is a slot adapter */
            len += sprintf(buf + len, "Adapter category: slot-card\n" "ROM Segment Address: ");
            if ((pos[2] & 0xf0) == 0xf0)
                  len += sprintf(buf + len, "off\n");
            else
                  len += sprintf(buf + len, "0x%x\n", ((pos[2] & 0xf0) << 13) + 0xc0000);
            len += sprintf(buf + len, "Chip status: %s\n", (pos[2] & 1) ? "enabled" : "disabled");
            len += sprintf(buf + len, "Adapter I/O Offset: 0x%x\n", ((pos[2] & 0x0e) << 2));
      } else {
            len += sprintf(buf + len, "Adapter category: unknown\n");
      }
      /* common subsystem information to write to the slotn file */
      len += sprintf(buf + len, "Subsystem PUN: %d\n", shpnt->this_id);
      len += sprintf(buf + len, "I/O base address range: 0x%x-0x%x\n", (unsigned int) (shpnt->io_port), (unsigned int) (shpnt->io_port + 7));
      len += sprintf(buf + len, "MCA-slot size: %d bits", connectore);
      /* Now make sure, the bufferlength is devidable by 4 to avoid
       * paging problems of the buffer. */
      while (len % sizeof(int) != (sizeof(int) - 1))
            len += sprintf(buf + len, " ");
      len += sprintf(buf + len, "\n");

      spin_unlock_irqrestore(shpnt->host_lock, flags);

      return len;
}
#endif

static struct scsi_host_template ibmmca_driver_template = {
          .proc_name      = "ibmmca",
        .proc_info        = ibmmca_proc_info,
          .name           = "IBM SCSI-Subsystem",
          .queuecommand   = ibmmca_queuecommand,
        .eh_abort_handler = ibmmca_abort,
        .eh_host_reset_handler = ibmmca_host_reset,
          .bios_param     = ibmmca_biosparam,
          .can_queue      = 16,
          .this_id        = 7,
          .sg_tablesize   = 16,
          .cmd_per_lun    = 1,
          .use_clustering = ENABLE_CLUSTERING,
};

static int ibmmca_probe(struct device *dev)
{
      struct Scsi_Host *shpnt;
      int port, id, i, j, k, irq, enabled, ret = -EINVAL;
      struct mca_device *mca_dev = to_mca_device(dev);
      const char *description = ibmmca_description[mca_dev->index];

      /* First of all, print the version number of the driver. This is
       * important to allow better user bugreports in case of already
       * having problems with the MCA_bus probing. */
      printk(KERN_INFO "IBM MCA SCSI: Version %s\n", IBMMCA_SCSI_DRIVER_VERSION);
      /* The POS2-register of all PS/2 model SCSI-subsystems has the following
       * interpretation of bits:
       *                             Bit 7 - 4 : Chip Revision ID (Release)
       *                             Bit 3 - 2 : Reserved
       *                             Bit 1     : 8k NVRAM Disabled
       *                             Bit 0     : Chip Enable (EN-Signal)
       * The POS3-register is interpreted as follows:
       *                             Bit 7 - 5 : SCSI ID
       *                             Bit 4     : Reserved = 0
       *                             Bit 3 - 0 : Reserved = 0
       * (taken from "IBM, PS/2 Hardware Interface Technical Reference, Common
       * Interfaces (1991)").
       * In short words, this means, that IBM PS/2 machines only support
       * 1 single subsystem by default. The slot-adapters must have another
       * configuration on pos2. Here, one has to assume the following
       * things for POS2-register:
       *                             Bit 7 - 4 : Chip Revision ID (Release)
       *                             Bit 3 - 1 : port offset factor
       *                             Bit 0     : Chip Enable (EN-Signal)
       * As I found a patch here, setting the IO-registers to 0x3540 forced,
       * as there was a 0x05 in POS2 on a model 56, I assume, that the
       * port 0x3540 must be fix for integrated SCSI-controllers.
       * Ok, this discovery leads to the following implementation: (M.Lang) */

      /* first look for the IBM SCSI integrated subsystem on the motherboard */
      for (j = 0; j < 8; j++) /* read the pos-information */
            pos[j] = mca_device_read_pos(mca_dev, j);
      id = (pos[3] & 0xe0) >> 5; /* this is correct and represents the PUN */
      enabled = (pos[2] &0x01);
      if (!enabled) {
            printk(KERN_WARNING "IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
            printk(KERN_WARNING "              SCSI-operations may not work.\n");
      }

      /* pos2 = pos3 = 0xff if there is no integrated SCSI-subsystem present, but
       * if we ignore the settings of all surrounding pos registers, it is not
       * completely sufficient to only check pos2 and pos3. */
      /* Therefore, now the following if statement is used to
       * make sure, we see a real integrated onboard SCSI-interface and no
       * internal system information, which gets mapped to some pos registers
       * on models 95xx. */
      if (mca_dev->slot == MCA_INTEGSCSI &&
          ((!pos[0] && !pos[1] && pos[2] > 0 &&
            pos[3] > 0 && !pos[4] && !pos[5] &&
            !pos[6] && !pos[7]) ||
           (pos[0] == 0xff && pos[1] == 0xff &&
            pos[2] < 0xff && pos[3] < 0xff &&
            pos[4] == 0xff && pos[5] == 0xff &&
            pos[6] == 0xff && pos[7] == 0xff))) {
            irq = IM_IRQ;
            port = IM_IO_PORT;
      } else {
            irq = IM_IRQ;
            port = IM_IO_PORT + ((pos[2] &0x0e) << 2);
            if ((mca_dev->index == IBM_SCSI2_FW) && (pos[6] != 0)) {
                  printk(KERN_ERR "IBM MCA SCSI: ERROR - Wrong POS(6)-register setting!\n");
                  printk(KERN_ERR "              Impossible to determine adapter PUN!\n");
                  printk(KERN_ERR "              Guessing adapter PUN = 7.\n");
                  id = 7;
            } else {
                  id = (pos[3] & 0xe0) >> 5;    /* get subsystem PUN */
                  if (mca_dev->index == IBM_SCSI2_FW) {
                        id |= (pos[3] & 0x10) >> 1;   /* get subsystem PUN high-bit
                                                 * for F/W adapters */
                  }
            }
            if ((mca_dev->index == IBM_SCSI2_FW) &&
                (pos[4] & 0x01) && (pos[6] == 0)) {
                  /* IRQ11 is used by SCSI-2 F/W Adapter/A */
                  printk(KERN_DEBUG "IBM MCA SCSI: SCSI-2 F/W adapter needs IRQ 11.\n");
                  irq = IM_IRQ_FW;
            }
      }



      /* give detailed information on the subsystem. This helps me
       * additionally during debugging and analyzing bug-reports. */
      printk(KERN_INFO "IBM MCA SCSI: %s found, io=0x%x, scsi id=%d,\n",
             description, port, id);
      if (mca_dev->slot == MCA_INTEGSCSI)
            printk(KERN_INFO "              chip rev.=%d, 8K NVRAM=%s, subsystem=%s\n", ((pos[2] & 0xf0) >> 4), (pos[2] & 2) ? "locked" : "accessible", (pos[2] & 1) ? "enabled." : "disabled.");
      else {
            if ((pos[2] & 0xf0) == 0xf0)
                  printk(KERN_DEBUG "              ROM Addr.=off,");
            else
                  printk(KERN_DEBUG "              ROM Addr.=0x%x,", ((pos[2] & 0xf0) << 13) + 0xc0000);

            printk(KERN_DEBUG " port-offset=0x%x, subsystem=%s\n", ((pos[2] & 0x0e) << 2), (pos[2] & 1) ? "enabled." : "disabled.");
      }

      /* check I/O region */
      if (!request_region(port, IM_N_IO_PORT, description)) {
            printk(KERN_ERR "IBM MCA SCSI: Unable to get I/O region 0x%x-0x%x (%d ports).\n", port, port + IM_N_IO_PORT - 1, IM_N_IO_PORT);
            goto out_fail;
      }

      /* register host */
      shpnt = scsi_host_alloc(&ibmmca_driver_template,
                        sizeof(struct ibmmca_hostdata));
      if (!shpnt) {
            printk(KERN_ERR "IBM MCA SCSI: Unable to register host.\n");
            goto out_release;
      }

      dev_set_drvdata(dev, shpnt);
      if(request_irq(irq, interrupt_handler, IRQF_SHARED, description, dev)) {
            printk(KERN_ERR "IBM MCA SCSI: failed to request interrupt %d\n", irq);
            goto out_free_host;
      }

      /* request I/O region */
      special(shpnt) = mca_dev->index;    /* important assignment or else crash! */
      subsystem_connector_size(shpnt) = 0;      /* preset slot-size */
      shpnt->irq = irq; /* assign necessary stuff for the adapter */
      shpnt->io_port = port;
      shpnt->n_io_port = IM_N_IO_PORT;
      shpnt->this_id = id;
      shpnt->max_id = 8;      /* 8 PUNs are default */
      /* now, the SCSI-subsystem is connected to Linux */

#ifdef IM_DEBUG_PROBE
      ctrl = (unsigned int) (inb(IM_CTR_REG(found))); /* get control-register status */
      printk("IBM MCA SCSI: Control Register contents: %x, status: %x\n", ctrl, inb(IM_STAT_REG(found)));
      printk("IBM MCA SCSI: This adapters' POS-registers: ");
      for (i = 0; i < 8; i++)
            printk("%x ", pos[i]);
      printk("\n");
#endif
      reset_status(shpnt) = IM_RESET_NOT_IN_PROGRESS;

      for (i = 0; i < 16; i++)      /* reset the tables */
            for (j = 0; j < 8; j++)
                  get_ldn(shpnt)[i][j] = MAX_LOG_DEV;

      /* check which logical devices exist */
      /* after this line, local interrupting is possible: */
      local_checking_phase_flag(shpnt) = 1;
      check_devices(shpnt, mca_dev->index);     /* call by value, using the global variable hosts */
      local_checking_phase_flag(shpnt) = 0;

      /* an ibm mca subsystem has been detected */

      for (k = 2; k < 7; k++)
            ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
      ((struct ibmmca_hostdata *) shpnt->hostdata)->_special = INTEGRATED_SCSI;
      mca_device_set_name(mca_dev, description);
      /* FIXME: NEED TO REPLUMB TO SYSFS
         mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo, shpnt);
      */
      mca_device_set_claim(mca_dev, 1);
      if (scsi_add_host(shpnt, dev)) {
            dev_printk(KERN_ERR, dev, "IBM MCA SCSI: scsi_add_host failed\n");
            goto out_free_host;
      }
      scsi_scan_host(shpnt);

      return 0;
 out_free_host:
      scsi_host_put(shpnt);
 out_release:
      release_region(port, IM_N_IO_PORT);
 out_fail:
      return ret;
}

static int __devexit ibmmca_remove(struct device *dev)
{
      struct Scsi_Host *shpnt = dev_get_drvdata(dev);
      scsi_remove_host(shpnt);
      release_region(shpnt->io_port, shpnt->n_io_port);
      free_irq(shpnt->irq, dev);
      scsi_host_put(shpnt);
      return 0;
}

/* The following routine is the SCSI command queue for the midlevel driver */
static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
{
      unsigned int ldn;
      unsigned int scsi_cmd;
      struct im_scb *scb;
      struct Scsi_Host *shpnt;
      int current_ldn;
      int id, lun;
      int target;
      int max_pun;
      int i;
      struct scatterlist *sg;

      shpnt = cmd->device->host;

      max_pun = subsystem_maxid(shpnt);
      if (ibm_ansi_order) {
            target = max_pun - 1 - cmd->device->id;
            if ((target <= subsystem_pun(shpnt)) && (cmd->device->id <= subsystem_pun(shpnt)))
                  target--;
            else if ((target >= subsystem_pun(shpnt)) && (cmd->device->id >= subsystem_pun(shpnt)))
                  target++;
      } else
            target = cmd->device->id;

      /* if (target,lun) is NO LUN or not existing at all, return error */
      if ((get_scsi(shpnt)[target][cmd->device->lun] == TYPE_NO_LUN) || (get_scsi(shpnt)[target][cmd->device->lun] == TYPE_NO_DEVICE)) {
            cmd->result = DID_NO_CONNECT << 16;
            if (done)
                  done(cmd);
            return 0;
      }

      /*if (target,lun) unassigned, do further checks... */
      ldn = get_ldn(shpnt)[target][cmd->device->lun];
      if (ldn >= MAX_LOG_DEV) {     /* on invalid ldn do special stuff */
            if (ldn > MAX_LOG_DEV) {      /* dynamical remapping if ldn unassigned */
                  current_ldn = next_ldn(shpnt);      /* stop-value for one circle */
                  while (ld(shpnt)[next_ldn(shpnt)].cmd) {  /* search for a occupied, but not in */
                        /* command-processing ldn. */
                        next_ldn(shpnt)++;
                        if (next_ldn(shpnt) >= MAX_LOG_DEV)
                              next_ldn(shpnt) = 7;
                        if (current_ldn == next_ldn(shpnt)) {     /* One circle done ? */
                              /* no non-processing ldn found */
                              scmd_printk(KERN_WARNING, cmd,
      "IBM MCA SCSI: Cannot assign SCSI-device dynamically!\n"
      "              On ldn 7-14 SCSI-commands everywhere in progress.\n"
      "              Reporting DID_NO_CONNECT for device.\n");
                              cmd->result = DID_NO_CONNECT << 16; /* return no connect */
                              if (done)
                                    done(cmd);
                              return 0;
                        }
                  }

                  /* unmap non-processing ldn */
                  for (id = 0; id < max_pun; id++)
                        for (lun = 0; lun < 8; lun++) {
                              if (get_ldn(shpnt)[id][lun] == next_ldn(shpnt)) {
                                    get_ldn(shpnt)[id][lun] = TYPE_NO_DEVICE;
                                    get_scsi(shpnt)[id][lun] = TYPE_NO_DEVICE;
                                    /* unmap entry */
                              }
                        }
                  /* set reduced interrupt_handler-mode for checking */
                  local_checking_phase_flag(shpnt) = 1;
                  /* map found ldn to pun,lun */
                  get_ldn(shpnt)[target][cmd->device->lun] = next_ldn(shpnt);
                  /* change ldn to the right value, that is now next_ldn */
                  ldn = next_ldn(shpnt);
                  /* unassign all ldns (pun,lun,ldn does not matter for remove) */
                  immediate_assign(shpnt, 0, 0, 0, REMOVE_LDN);
                  /* set only LDN for remapped device */
                  immediate_assign(shpnt, target, cmd->device->lun, ldn, SET_LDN);
                  /* get device information for ld[ldn] */
                  if (device_exists(shpnt, ldn, &ld(shpnt)[ldn].block_length, &ld(shpnt)[ldn].device_type)) {
                        ld(shpnt)[ldn].cmd = NULL;    /* To prevent panic set 0, because
                                                   devices that were not assigned,
                                                   should have nothing in progress. */
                        get_scsi(shpnt)[target][cmd->device->lun] = ld(shpnt)[ldn].device_type;
                        /* increase assignment counters for statistics in /proc */
                        IBM_DS(shpnt).dynamical_assignments++;
                        IBM_DS(shpnt).ldn_assignments[ldn]++;
                  } else
                        /* panic here, because a device, found at boottime has
                           vanished */
                        panic("IBM MCA SCSI: ldn=0x%x, SCSI-device on (%d,%d) vanished!\n", ldn, target, cmd->device->lun);
                  /* unassign again all ldns (pun,lun,ldn does not matter for remove) */
                  immediate_assign(shpnt, 0, 0, 0, REMOVE_LDN);
                  /* remap all ldns, as written in the pun/lun table */
                  lun = 0;
#ifdef CONFIG_SCSI_MULTI_LUN
                  for (lun = 0; lun < 8; lun++)
#endif
                        for (id = 0; id < max_pun; id++) {
                              if (get_ldn(shpnt)[id][lun] <= MAX_LOG_DEV)
                                    immediate_assign(shpnt, id, lun, get_ldn(shpnt)[id][lun], SET_LDN);
                        }
                  /* set back to normal interrupt_handling */
                  local_checking_phase_flag(shpnt) = 0;
#ifdef IM_DEBUG_PROBE
                  /* Information on syslog terminal */
                  printk("IBM MCA SCSI: ldn=0x%x dynamically reassigned to (%d,%d).\n", ldn, target, cmd->device->lun);
#endif
                  /* increase next_ldn for next dynamical assignment */
                  next_ldn(shpnt)++;
                  if (next_ldn(shpnt) >= MAX_LOG_DEV)
                        next_ldn(shpnt) = 7;
            } else {    /* wall against Linux accesses to the subsystem adapter */
                  cmd->result = DID_BAD_TARGET << 16;
                  if (done)
                        done(cmd);
                  return 0;
            }
      }

      /*verify there is no command already in progress for this log dev */
      if (ld(shpnt)[ldn].cmd)
            panic("IBM MCA SCSI: cmd already in progress for this ldn.\n");

      /*save done in cmd, and save cmd for the interrupt handler */
      cmd->scsi_done = done;
      ld(shpnt)[ldn].cmd = cmd;

      /*fill scb information independent of the scsi command */
      scb = &(ld(shpnt)[ldn].scb);
      ld(shpnt)[ldn].tsb.dev_status = 0;
      scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE;
      scb->tsb_adr = isa_virt_to_bus(&(ld(shpnt)[ldn].tsb));
      scsi_cmd = cmd->cmnd[0];

      if (scsi_sg_count(cmd)) {
            BUG_ON(scsi_sg_count(cmd) > 16);

            scsi_for_each_sg(cmd, sg, scsi_sg_count(cmd), i) {
                  ld(shpnt)[ldn].sge[i].address = (void *) (isa_page_to_bus(sg_page(sg)) + sg->offset);
                  ld(shpnt)[ldn].sge[i].byte_length = sg->length;
            }
            scb->enable |= IM_POINTER_TO_LIST;
            scb->sys_buf_adr = isa_virt_to_bus(&(ld(shpnt)[ldn].sge[0]));
            scb->sys_buf_length = scsi_sg_count(cmd) * sizeof(struct im_sge);
      } else {
            scb->sys_buf_adr = isa_virt_to_bus(scsi_sglist(cmd));
            /* recent Linux midlevel SCSI places 1024 byte for inquiry
             * command. Far too much for old PS/2 hardware. */
            switch (scsi_cmd) {
                  /* avoid command errors by setting bufferlengths to
                   * ANSI-standard. Beware of forcing it to 255,
                   * this could SEGV the kernel!!! */
            case INQUIRY:
            case REQUEST_SENSE:
            case MODE_SENSE:
            case MODE_SELECT:
                  if (scsi_bufflen(cmd) > 255)
                        scb->sys_buf_length = 255;
                  else
                        scb->sys_buf_length = scsi_bufflen(cmd);
                  break;
            case TEST_UNIT_READY:
                  scb->sys_buf_length = 0;
                  break;
            default:
                  scb->sys_buf_length = scsi_bufflen(cmd);
                  break;
            }
      }
      /*fill scb information dependent on scsi command */

#ifdef IM_DEBUG_CMD
      printk("issue scsi cmd=%02x to ldn=%d\n", scsi_cmd, ldn);
#endif

      /* for specific device-type debugging: */
#ifdef IM_DEBUG_CMD_SPEC_DEV
      if (ld(shpnt)[ldn].device_type == IM_DEBUG_CMD_DEVICE)
            printk("(SCSI-device-type=0x%x) issue scsi cmd=%02x to ldn=%d\n", ld(shpnt)[ldn].device_type, scsi_cmd, ldn);
#endif

      /* for possible panics store current command */
      last_scsi_command(shpnt)[ldn] = scsi_cmd;
      last_scsi_type(shpnt)[ldn] = IM_SCB;
      /* update statistical info */
      IBM_DS(shpnt).total_accesses++;
      IBM_DS(shpnt).ldn_access[ldn]++;

      switch (scsi_cmd) {
      case READ_6:
      case WRITE_6:
      case READ_10:
      case WRITE_10:
      case READ_12:
      case WRITE_12:
            /* Distinguish between disk and other devices. Only disks (that are the
               most frequently accessed devices) should be supported by the
               IBM-SCSI-Subsystem commands. */
            switch (ld(shpnt)[ldn].device_type) {
            case TYPE_DISK:   /* for harddisks enter here ... */
            case TYPE_MOD:    /* ... try it also for MO-drives (send flames as */
                  /*     you like, if this won't work.) */
                  if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12) {
                        /* read command preparations */
                        scb->enable |= IM_READ_CONTROL;
                        IBM_DS(shpnt).ldn_read_access[ldn]++;     /* increase READ-access on ldn stat. */
                        scb->command = IM_READ_DATA_CMD | IM_NO_DISCONNECT;
                  } else {    /* write command preparations */
                        IBM_DS(shpnt).ldn_write_access[ldn]++;    /* increase write-count on ldn stat. */
                        scb->command = IM_WRITE_DATA_CMD | IM_NO_DISCONNECT;
                  }
                  if (scsi_cmd == READ_6 || scsi_cmd == WRITE_6) {
                        scb->u1.log_blk_adr = (((unsigned) cmd->cmnd[3]) << 0) | (((unsigned) cmd->cmnd[2]) << 8) | ((((unsigned) cmd->cmnd[1]) & 0x1f) << 16);
                        scb->u2.blk.count = (unsigned) cmd->cmnd[4];
                  } else {
                        scb->u1.log_blk_adr = (((unsigned) cmd->cmnd[5]) << 0) | (((unsigned) cmd->cmnd[4]) << 8) | (((unsigned) cmd->cmnd[3]) << 16) | (((unsigned) cmd->cmnd[2]) << 24);
                        scb->u2.blk.count = (((unsigned) cmd->cmnd[8]) << 0) | (((unsigned) cmd->cmnd[7]) << 8);
                  }
                  last_scsi_logical_block(shpnt)[ldn] = scb->u1.log_blk_adr;
                  last_scsi_blockcount(shpnt)[ldn] = scb->u2.blk.count;
                  scb->u2.blk.length = ld(shpnt)[ldn].block_length;
                  break;
                  /* for other devices, enter here. Other types are not known by
                     Linux! TYPE_NO_LUN is forbidden as valid device. */
            case TYPE_ROM:
            case TYPE_TAPE:
            case TYPE_PROCESSOR:
            case TYPE_WORM:
            case TYPE_SCANNER:
            case TYPE_MEDIUM_CHANGER:
                  /* If there is a sequential-device, IBM recommends to use
                     IM_OTHER_SCSI_CMD_CMD instead of subsystem READ/WRITE.
                     This includes CD-ROM devices, too, due to the partial sequential
                     read capabilities. */
                  scb->command = IM_OTHER_SCSI_CMD_CMD;
                  if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12)
                        /* enable READ */
                        scb->enable |= IM_READ_CONTROL;
                  scb->enable |= IM_BYPASS_BUFFER;
                  scb->u1.scsi_cmd_length = cmd->cmd_len;
                  memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
                  last_scsi_type(shpnt)[ldn] = IM_LONG_SCB;
                  /* Read/write on this non-disk devices is also displayworthy,
                     so flash-up the LED/display. */
                  break;
            }
            break;
      case INQUIRY:
            IBM_DS(shpnt).ldn_inquiry_access[ldn]++;
            scb->command = IM_DEVICE_INQUIRY_CMD;
            scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
            scb->u1.log_blk_adr = 0;
            break;
      case TEST_UNIT_READY:
            scb->command = IM_OTHER_SCSI_CMD_CMD;
            scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
            scb->u1.log_blk_adr = 0;
            scb->u1.scsi_cmd_length = 6;
            memcpy(scb->u2.scsi_command, cmd->cmnd, 6);
            last_scsi_type(shpnt)[ldn] = IM_LONG_SCB;
            break;
      case READ_CAPACITY:
            /* the length of system memory buffer must be exactly 8 bytes */
            scb->command = IM_READ_CAPACITY_CMD;
            scb->enable |= IM_READ_CONTROL | IM_BYPASS_BUFFER;
            if (scb->sys_buf_length > 8)
                  scb->sys_buf_length = 8;
            break;
            /* Commands that need read-only-mode (system <- device): */
      case REQUEST_SENSE:
            scb->command = IM_REQUEST_SENSE_CMD;
            scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
            break;
            /* Commands that need write-only-mode (system -> device): */
      case MODE_SELECT:
      case MODE_SELECT_10:
            IBM_DS(shpnt).ldn_modeselect_access[ldn]++;
            scb->command = IM_OTHER_SCSI_CMD_CMD;
            scb->enable |= IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;     /*Select needs WRITE-enabled */
            scb->u1.scsi_cmd_length = cmd->cmd_len;
            memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
            last_scsi_type(shpnt)[ldn] = IM_LONG_SCB;
            break;
            /* For other commands, read-only is useful. Most other commands are
               running without an input-data-block. */
      default:
            scb->command = IM_OTHER_SCSI_CMD_CMD;
            scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
            scb->u1.scsi_cmd_length = cmd->cmd_len;
            memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
            last_scsi_type(shpnt)[ldn] = IM_LONG_SCB;
            break;
      }
      /*issue scb command, and return */
      if (++disk_rw_in_progress == 1)
            PS2_DISK_LED_ON(shpnt->host_no, target);

      if (last_scsi_type(shpnt)[ldn] == IM_LONG_SCB) {
            issue_cmd(shpnt, isa_virt_to_bus(scb), IM_LONG_SCB | ldn);
            IBM_DS(shpnt).long_scbs++;
      } else {
            issue_cmd(shpnt, isa_virt_to_bus(scb), IM_SCB | ldn);
            IBM_DS(shpnt).scbs++;
      }
      return 0;
}

static int __ibmmca_abort(Scsi_Cmnd * cmd)
{
      /* Abort does not work, as the adapter never generates an interrupt on
       * whatever situation is simulated, even when really pending commands
       * are running on the adapters' hardware ! */

      struct Scsi_Host *shpnt;
      unsigned int ldn;
      void (*saved_done) (Scsi_Cmnd *);
      int target;
      int max_pun;
      unsigned long imm_command;

#ifdef IM_DEBUG_PROBE
      printk("IBM MCA SCSI: Abort subroutine called...\n");
#endif

      shpnt = cmd->device->host;

      max_pun = subsystem_maxid(shpnt);
      if (ibm_ansi_order) {
            target = max_pun - 1 - cmd->device->id;
            if ((target <= subsystem_pun(shpnt)) && (cmd->device->id <= subsystem_pun(shpnt)))
                  target--;
            else if ((target >= subsystem_pun(shpnt)) && (cmd->device->id >= subsystem_pun(shpnt)))
                  target++;
      } else
            target = cmd->device->id;

      /* get logical device number, and disable system interrupts */
      printk(KERN_WARNING "IBM MCA SCSI: Sending abort to device pun=%d, lun=%d.\n", target, cmd->device->lun);
      ldn = get_ldn(shpnt)[target][cmd->device->lun];

      /*if cmd for this ldn has already finished, no need to abort */
      if (!ld(shpnt)[ldn].cmd) {
                return SUCCESS;
      }

      /* Clear ld.cmd, save done function, install internal done,
       * send abort immediate command (this enables sys. interrupts),
       * and wait until the interrupt arrives.
       */
      saved_done = cmd->scsi_done;
      cmd->scsi_done = internal_done;
      cmd->SCp.Status = 0;
      last_scsi_command(shpnt)[ldn] = IM_ABORT_IMM_CMD;
      last_scsi_type(shpnt)[ldn] = IM_IMM_CMD;
      imm_command = inl(IM_CMD_REG(shpnt));
      imm_command &= (unsigned long) (0xffff0000);    /* mask reserved stuff */
      imm_command |= (unsigned long) (IM_ABORT_IMM_CMD);
      /* must wait for attention reg not busy */
      /* FIXME - timeout, politeness */
      while (1) {
            if (!(inb(IM_STAT_REG(shpnt)) & IM_BUSY))
                  break;
      }
      /* write registers and enable system interrupts */
      outl(imm_command, IM_CMD_REG(shpnt));
      outb(IM_IMM_CMD | ldn, IM_ATTN_REG(shpnt));
#ifdef IM_DEBUG_PROBE
      printk("IBM MCA SCSI: Abort queued to adapter...\n");
#endif
      spin_unlock_irq(shpnt->host_lock);
      while (!cmd->SCp.Status)
            yield();
      spin_lock_irq(shpnt->host_lock);
      cmd->scsi_done = saved_done;
#ifdef IM_DEBUG_PROBE
      printk("IBM MCA SCSI: Abort returned with adapter response...\n");
#endif

      /*if abort went well, call saved done, then return success or error */
      if (cmd->result == (DID_ABORT << 16)) 
      {
            cmd->result |= DID_ABORT << 16;
            if (cmd->scsi_done)
                  (cmd->scsi_done) (cmd);
            ld(shpnt)[ldn].cmd = NULL;
#ifdef IM_DEBUG_PROBE
            printk("IBM MCA SCSI: Abort finished with success.\n");
#endif
            return SUCCESS;
      } else {
            cmd->result |= DID_NO_CONNECT << 16;
            if (cmd->scsi_done)
                  (cmd->scsi_done) (cmd);
            ld(shpnt)[ldn].cmd = NULL;
#ifdef IM_DEBUG_PROBE
            printk("IBM MCA SCSI: Abort failed.\n");
#endif
            return FAILED;
      }
}

static int ibmmca_abort(Scsi_Cmnd * cmd)
{
      struct Scsi_Host *shpnt = cmd->device->host;
      int rc;

      spin_lock_irq(shpnt->host_lock);
      rc = __ibmmca_abort(cmd);
      spin_unlock_irq(shpnt->host_lock);

      return rc;
}

static int __ibmmca_host_reset(Scsi_Cmnd * cmd)
{
      struct Scsi_Host *shpnt;
      Scsi_Cmnd *cmd_aid;
      int ticks, i;
      unsigned long imm_command;

      BUG_ON(cmd == NULL);

      ticks = IM_RESET_DELAY * HZ;
      shpnt = cmd->device->host;

      if (local_checking_phase_flag(shpnt)) {
            printk(KERN_WARNING "IBM MCA SCSI: unable to reset while checking devices.\n");
            return FAILED;
      }

      /* issue reset immediate command to subsystem, and wait for interrupt */
      printk("IBM MCA SCSI: resetting all devices.\n");
      reset_status(shpnt) = IM_RESET_IN_PROGRESS;
      last_scsi_command(shpnt)[0xf] = IM_RESET_IMM_CMD;
      last_scsi_type(shpnt)[0xf] = IM_IMM_CMD;
      imm_command = inl(IM_CMD_REG(shpnt));
      imm_command &= (unsigned long) (0xffff0000);    /* mask reserved stuff */
      imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
      /* must wait for attention reg not busy */
      while (1) {
            if (!(inb(IM_STAT_REG(shpnt)) & IM_BUSY))
                  break;
            spin_unlock_irq(shpnt->host_lock);
            yield();
            spin_lock_irq(shpnt->host_lock);
      }
      /*write registers and enable system interrupts */
      outl(imm_command, IM_CMD_REG(shpnt));
      outb(IM_IMM_CMD | 0xf, IM_ATTN_REG(shpnt));
      /* wait for interrupt finished or intr_stat register to be set, as the
       * interrupt will not be executed, while we are in here! */
       
      /* FIXME: This is really really icky we so want a sleeping version of this ! */
      while (reset_status(shpnt) == IM_RESET_IN_PROGRESS && --ticks && ((inb(IM_INTR_REG(shpnt)) & 0x8f) != 0x8f)) {
            udelay((1 + 999 / HZ) * 1000);
            barrier();
      }
      /* if reset did not complete, just return an error */
      if (!ticks) {
            printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
            reset_status(shpnt) = IM_RESET_FINISHED_FAIL;
            return FAILED;
      }

      if ((inb(IM_INTR_REG(shpnt)) & 0x8f) == 0x8f) {
            /* analysis done by this routine and not by the intr-routine */
            if (inb(IM_INTR_REG(shpnt)) == 0xaf)
                  reset_status(shpnt) = IM_RESET_FINISHED_OK_NO_INT;
            else if (inb(IM_INTR_REG(shpnt)) == 0xcf)
                  reset_status(shpnt) = IM_RESET_FINISHED_FAIL;
            else        /* failed, 4get it */
                  reset_status(shpnt) = IM_RESET_NOT_IN_PROGRESS_NO_INT;
            outb(IM_EOI | 0xf, IM_ATTN_REG(shpnt));
      }

      /* if reset failed, just return an error */
      if (reset_status(shpnt) == IM_RESET_FINISHED_FAIL) {
            printk(KERN_ERR "IBM MCA SCSI: reset failed.\n");
            return FAILED;
      }

      /* so reset finished ok - call outstanding done's, and return success */
      printk(KERN_INFO "IBM MCA SCSI: Reset successfully completed.\n");
      for (i = 0; i < MAX_LOG_DEV; i++) {
            cmd_aid = ld(shpnt)[i].cmd;
            if (cmd_aid && cmd_aid->scsi_done) {
                  ld(shpnt)[i].cmd = NULL;
                  cmd_aid->result = DID_RESET << 16;
            }
      }
      return SUCCESS;
}

static int ibmmca_host_reset(Scsi_Cmnd * cmd)
{
      struct Scsi_Host *shpnt = cmd->device->host;
      int rc;

      spin_lock_irq(shpnt->host_lock);
      rc = __ibmmca_host_reset(cmd);
      spin_unlock_irq(shpnt->host_lock);

      return rc;
}

static int ibmmca_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int *info)
{
      int size = capacity;
      info[0] = 64;
      info[1] = 32;
      info[2] = size / (info[0] * info[1]);
      if (info[2] >= 1024) {
            info[0] = 128;
            info[1] = 63;
            info[2] = size / (info[0] * info[1]);
            if (info[2] >= 1024) {
                  info[0] = 255;
                  info[1] = 63;
                  info[2] = size / (info[0] * info[1]);
                  if (info[2] >= 1024)
                        info[2] = 1023;
            }
      }
      return 0;
}

/* calculate percentage of total accesses on a ldn */
static int ldn_access_load(struct Scsi_Host *shpnt, int ldn)
{
      if (IBM_DS(shpnt).total_accesses == 0)
            return (0);
      if (IBM_DS(shpnt).ldn_access[ldn] == 0)
            return (0);
      return (IBM_DS(shpnt).ldn_access[ldn] * 100) / IBM_DS(shpnt).total_accesses;
}

/* calculate total amount of r/w-accesses */
static int ldn_access_total_read_write(struct Scsi_Host *shpnt)
{
      int a;
      int i;

      a = 0;
      for (i = 0; i <= MAX_LOG_DEV; i++)
            a += IBM_DS(shpnt).ldn_read_access[i] + IBM_DS(shpnt).ldn_write_access[i];
      return (a);
}

static int ldn_access_total_inquiry(struct Scsi_Host *shpnt)
{
      int a;
      int i;

      a = 0;
      for (i = 0; i <= MAX_LOG_DEV; i++)
            a += IBM_DS(shpnt).ldn_inquiry_access[i];
      return (a);
}

static int ldn_access_total_modeselect(struct Scsi_Host *shpnt)
{
      int a;
      int i;

      a = 0;
      for (i = 0; i <= MAX_LOG_DEV; i++)
            a += IBM_DS(shpnt).ldn_modeselect_access[i];
      return (a);
}

/* routine to display info in the proc-fs-structure (a deluxe feature) */
static int ibmmca_proc_info(struct Scsi_Host *shpnt, char *buffer, char **start, off_t offset, int length, int inout)
{
      int len = 0;
      int i, id, lun;
      unsigned long flags;
      int max_pun;

      
      spin_lock_irqsave(shpnt->host_lock, flags);     /* Check it */

      max_pun = subsystem_maxid(shpnt);

      len += sprintf(buffer + len, "\n             IBM-SCSI-Subsystem-Linux-Driver, Version %s\n\n\n", IBMMCA_SCSI_DRIVER_VERSION);
      len += sprintf(buffer + len, " SCSI Access-Statistics:\n");
      len += sprintf(buffer + len, "               Device Scanning Order....: %s\n", (ibm_ansi_order) ? "IBM/ANSI" : "New Industry Standard");
#ifdef CONFIG_SCSI_MULTI_LUN
      len += sprintf(buffer + len, "               Multiple LUN probing.....: Yes\n");
#else
      len += sprintf(buffer + len, "               Multiple LUN probing.....: No\n");
#endif
      len += sprintf(buffer + len, "               This Hostnumber..........: %d\n", shpnt->host_no);
      len += sprintf(buffer + len, "               Base I/O-Port............: 0x%x\n", (unsigned int) (IM_CMD_REG(shpnt)));
      len += sprintf(buffer + len, "               (Shared) IRQ.............: %d\n", IM_IRQ);
      len += sprintf(buffer + len, "               Total Interrupts.........: %d\n", IBM_DS(shpnt).total_interrupts);
      len += sprintf(buffer + len, "               Total SCSI Accesses......: %d\n", IBM_DS(shpnt).total_accesses);
      len += sprintf(buffer + len, "               Total short SCBs.........: %d\n", IBM_DS(shpnt).scbs);
      len += sprintf(buffer + len, "               Total long SCBs..........: %d\n", IBM_DS(shpnt).long_scbs);
      len += sprintf(buffer + len, "                 Total SCSI READ/WRITE..: %d\n", ldn_access_total_read_write(shpnt));
      len += sprintf(buffer + len, "                 Total SCSI Inquiries...: %d\n", ldn_access_total_inquiry(shpnt));
      len += sprintf(buffer + len, "                 Total SCSI Modeselects.: %d\n", ldn_access_total_modeselect(shpnt));
      len += sprintf(buffer + len, "                 Total SCSI other cmds..: %d\n", IBM_DS(shpnt).total_accesses - ldn_access_total_read_write(shpnt)
                   - ldn_access_total_modeselect(shpnt)
                   - ldn_access_total_inquiry(shpnt));
      len += sprintf(buffer + len, "               Total SCSI command fails.: %d\n\n", IBM_DS(shpnt).total_errors);
      len += sprintf(buffer + len, " Logical-Device-Number (LDN) Access-Statistics:\n");
      len += sprintf(buffer + len, "         LDN | Accesses [%%] |   READ    |   WRITE   | ASSIGNMENTS\n");
      len += sprintf(buffer + len, "        -----|--------------|-----------|-----------|--------------\n");
      for (i = 0; i <= MAX_LOG_DEV; i++)
            len += sprintf(buffer + len, "         %2X  |    %3d       |  %8d |  %8d | %8d\n", i, ldn_access_load(shpnt, i), IBM_DS(shpnt).ldn_read_access[i], IBM_DS(shpnt).ldn_write_access[i], IBM_DS(shpnt).ldn_assignments[i]);
      len += sprintf(buffer + len, "        -----------------------------------------------------------\n\n");
      len += sprintf(buffer + len, " Dynamical-LDN-Assignment-Statistics:\n");
      len += sprintf(buffer + len, "               Number of physical SCSI-devices..: %d (+ Adapter)\n", IBM_DS(shpnt).total_scsi_devices);
      len += sprintf(buffer + len, "               Dynamical Assignment necessary...: %s\n", IBM_DS(shpnt).dyn_flag ? "Yes" : "No ");
      len += sprintf(buffer + len, "               Next LDN to be assigned..........: 0x%x\n", next_ldn(shpnt));
      len += sprintf(buffer + len, "               Dynamical assignments done yet...: %d\n", IBM_DS(shpnt).dynamical_assignments);
      len += sprintf(buffer + len, "\n Current SCSI-Device-Mapping:\n");
      len += sprintf(buffer + len, "        Physical SCSI-Device Map               Logical SCSI-Device Map\n");
      len += sprintf(buffer + len, "    ID\\LUN  0  1  2  3  4  5  6  7       ID\\LUN  0  1  2  3  4  5  6  7\n");
      for (id = 0; id < max_pun; id++) {
            len += sprintf(buffer + len, "    %2d     ", id);
            for (lun = 0; lun < 8; lun++)
                  len += sprintf(buffer + len, "%2s ", ti_p(get_scsi(shpnt)[id][lun]));
            len += sprintf(buffer + len, "      %2d     ", id);
            for (lun = 0; lun < 8; lun++)
                  len += sprintf(buffer + len, "%2s ", ti_l(get_ldn(shpnt)[id][lun]));
            len += sprintf(buffer + len, "\n");
      }

      len += sprintf(buffer + len, "(A = IBM-Subsystem, D = Harddisk, T = Tapedrive, P = Processor, W = WORM,\n");
      len += sprintf(buffer + len, " R = CD-ROM, S = Scanner, M = MO-Drive, C = Medium-Changer, + = unprovided LUN,\n");
      len += sprintf(buffer + len, " - = nothing found, nothing assigned or unprobed LUN)\n\n");

      *start = buffer + offset;
      len -= offset;
      if (len > length)
            len = length;
      spin_unlock_irqrestore(shpnt->host_lock, flags);
      return len;
}

static int option_setup(char *str)
{
      int ints[IM_MAX_HOSTS];
      char *cur = str;
      int i = 1;

      while (cur && isdigit(*cur) && i <= IM_MAX_HOSTS) {
            ints[i++] = simple_strtoul(cur, NULL, 0);
            if ((cur = strchr(cur, ',')) != NULL)
                  cur++;
      }
      ints[0] = i - 1;
      internal_ibmmca_scsi_setup(cur, ints);
      return 1;
}

__setup("ibmmcascsi=", option_setup);

static struct mca_driver ibmmca_driver = {
      .id_table = ibmmca_id_table,
      .driver = {
            .name = "ibmmca",
            .bus  = &mca_bus_type,
            .probe      = ibmmca_probe,
            .remove     = __devexit_p(ibmmca_remove),
      },
};

static int __init ibmmca_init(void)
{
#ifdef MODULE
      /* If the driver is run as module, read from conf.modules or cmd-line */
      if (boot_options)
            option_setup(boot_options);
#endif

      return mca_register_driver_integrated(&ibmmca_driver, MCA_INTEGSCSI);
}

static void __exit ibmmca_exit(void)
{
      mca_unregister_driver(&ibmmca_driver);
}

module_init(ibmmca_init);
module_exit(ibmmca_exit);

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