Import 2.3.18pre1

[davej-history.git] / drivers / scsi / ibmmca.c

/*
 * Low Level Driver for the IBM Microchannel SCSI Subsystem
 *
 * 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 README.ibmmca 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 and info.
 */

/******************* HEADER FILE INCLUDES ************************************/
#ifndef LINUX_VERSION_CODE
#include <linux/version.h>
#endif

/* choose adaption for Kernellevel */
#define local_LinuxVersionCode(v, p, s) (((v)<<16)+((p)<<8)+(s))
#if LINUX_VERSION_CODE < local_LinuxVersionCode(2,1,0)
#define OLDKERN
#else
#undef OLDKERN
#endif

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/blk.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/mca.h>
#include <asm/system.h>
#ifndef OLDKERN
#include <linux/spinlock.h>
#endif
#include <asm/io.h>
#include"sd.h"
#include"scsi.h"
#include"hosts.h"
#include"ibmmca.h"

#include <linux/config.h>/* for CONFIG_SCSI_IBMMCA etc. */

/******************* LOCAL DEFINES *******************************************/

#ifndef mdelay
#define mdelay(a) udelay((a) * 1000)
#endif

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

/* current version of this driver-source: */
#define IBMMCA_SCSI_DRIVER_VERSION"3.1e"

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

/* 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(hi) (hosts[(hi)]->io_port)/*Command Interface, (4 bytes long) */
#define IM_ATTN_REG(hi) (hosts[(hi)]->io_port+4)/*Attention (1 byte) */
#define IM_CTR_REG(hi) (hosts[(hi)]->io_port+5)/*Basic Control (1 byte) */
#define IM_INTR_REG(hi) (hosts[(hi)]->io_port+6)/*Interrupt Status (1 byte, r/o) */
#define IM_STAT_REG(hi) (hosts[(hi)]->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_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 */
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) */
struct im_sge
{
void*address;
unsigned long byte_length;
};

/*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_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_CHAIN_ON_NO_ERROR 0x0001

/*TSB (Termination Status Block) structure */
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

/*--------------------------------------------------------------------*/
/*
 The model 95 doesn't have a standard activity light. Instead it
 has a row of LEDs on the front. We use the last one as the activity
 indicator if we think we're on a model 95. I suspect the model id
 check will be either too narrow or too general, and some machines
 won't have an activity indicator. Oh well...

 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

/* 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. */

/* use_display is set by the ibmmcascsi=display command line arg */
static int use_display =0;
/* use_adisplay is set by ibmmcascsi=adisplay, which offers a higher
 * level of displayed luxus on PS/2 95 (really fancy! :-))) */
static int use_adisplay =0;

#define PS2_DISK_LED_ON(ad,id) {\
 if( use_display ) { outb((char)(id+48), MOD95_LED_PORT ); \
 outb((char)(ad+48), MOD95_LED_PORT+1); } \
 else if( use_adisplay ) { if (id<7) outb((char)(id+48), \
 MOD95_LED_PORT+1+id); outb((char)(ad+48), MOD95_LED_PORT); } \
 else outb(inb(PS2_SYS_CTR) | 0xc0, PS2_SYS_CTR); \
}

/* bug fixed, Dec 15, 1997, where | was replaced by & here */
#define PS2_DISK_LED_OFF() {\
 if( use_display ) { outb(' ', MOD95_LED_PORT ); \
 outb(' ', MOD95_LED_PORT+1); } \
 if ( use_adisplay ) { outb(' ',MOD95_LED_PORT ); \
 outb(' ',MOD95_LED_PORT+1); outb(' ',MOD95_LED_PORT+2); \
 outb(' ',MOD95_LED_PORT+3); outb(' ',MOD95_LED_PORT+4); \
 outb(' ',MOD95_LED_PORT+5); outb(' ',MOD95_LED_PORT+6); \
 outb(' ',MOD95_LED_PORT+7); } \
 else outb(inb(PS2_SYS_CTR) & 0x3f, PS2_SYS_CTR); \
}

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

/*list of supported subsystems */
struct subsys_list_struct
{
unsigned short mca_id;
char*description;
};

/* List of possible IBM-SCSI-adapters */
struct subsys_list_struct subsys_list[] =
{
{0x8efc,"IBM Fast SCSI-2 Adapter"},/* special = 0 */
{0x8efd,"IBM 7568 Industrial Computer SCSI Adapter w/cache"},/* special = 1 */
{0x8ef8,"IBM Expansion Unit SCSI Controller"},/* special = 2 */
{0x8eff,"IBM SCSI Adapter w/Cache"},/* special = 3 */
{0x8efe,"IBM SCSI Adapter"},/* special = 4 */
};

/*for /proc filesystem */
struct proc_dir_entry proc_scsi_ibmmca =
{
 PROC_SCSI_IBMMCA,6,"ibmmca",
 S_IFDIR | S_IRUGO | S_IXUGO,2,
0,0,0, NULL, NULL, NULL, NULL,
 NULL, NULL, NULL 
};

/* 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 */
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 */
};

/* statistics of the driver during operations (for proc_info) */
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 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 */
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[8][8];
/*array that contains the information about the physical SCSI-devices
 attached to this host adapter: */
unsigned char _get_scsi[8][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];
/* 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 and pos3 */
unsigned _pos2, _pos3;
/* assign a special variable, that contains dedicated info about the
 adaptertype */
int _special;
};

/* macros to access host data structure */
#define subsystem_pun(hi) (hosts[(hi)]->this_id)
#define ld(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_ld)
#define get_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_ldn)
#define get_scsi(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_scsi)
#define local_checking_phase_flag(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_local_checking_phase_flag)
#define got_interrupt(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_got_interrupt)
#define stat_result(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_stat_result)
#define reset_status(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_reset_status)
#define last_scsi_command(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_command)
#define last_scsi_type(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_type)
#define next_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_next_ldn)
#define IBM_DS(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_IBM_DS)
#define special(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_special)
#define pos2(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos2)
#define pos3(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos3)

/* 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

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

/* 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) */
#ifdef MODULE_PARM
MODULE_PARM(io_port,"1-"__MODULE_STRING(IM_MAX_HOSTS)"i");
MODULE_PARM(scsi_id,"1-"__MODULE_STRING(IM_MAX_HOSTS)"i");
MODULE_PARM(display,"1i");
MODULE_PARM(adisplay,"1i");
MODULE_PARM(bypass,"1i");
MODULE_PARM(normal,"1i");
MODULE_PARM(ansi,"1i");
#endif

/*counter of concurrent disk read/writes, to turn on/off disk led */
static int disk_rw_in_progress =0;

/* spinlock handling to avoid command clash while in operation */
#ifndef OLDKERN
spinlock_t info_lock = SPIN_LOCK_UNLOCKED;
spinlock_t proc_lock = SPIN_LOCK_UNLOCKED;
spinlock_t abort_lock = SPIN_LOCK_UNLOCKED;
spinlock_t reset_lock = SPIN_LOCK_UNLOCKED;
spinlock_t issue_lock = SPIN_LOCK_UNLOCKED;
spinlock_t intr_lock = SPIN_LOCK_UNLOCKED;
#endif

/* host information */
static int found =0;
static struct Scsi_Host *hosts[IM_MAX_HOSTS+1] = { NULL };
static unsigned int pos[8];/* whole pos register-line */
/* 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

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

/******************* FUNCTIONS IN FORWARD DECLARATION ************************/

static voidinterrupt_handler(int,void*,struct pt_regs *);
#ifndef OLDKERN
static voiddo_interrupt_handler(int,void*,struct pt_regs *);
#endif
static voidissue_cmd(int,unsigned long,unsigned char);
static voidinternal_done(Scsi_Cmnd * cmd);
static voidcheck_devices(int);
static intimmediate_assign(int,unsigned int,unsigned int,unsigned int,
unsigned int);
#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
static intimmediate_reset(int,unsigned int);
#endif
static intdevice_inquiry(int,int);
static intread_capacity(int,int);
static char*ti_p(int);
static char*ti_l(int);
static intdevice_exists(int,int,int*,int*);
static struct Scsi_Host *ibmmca_register(Scsi_Host_Template *,
int,int,char*);

/* local functions needed for proc_info */
static intldn_access_load(int,int);
static intldn_access_total_read_write(int);

static int bypass_controller =0;/* bypass integrated SCSI-cmd set flag */
/*--------------------------------------------------------------------*/

/******************* LOCAL FUNCTIONS IMPLEMENTATION *************************/

#ifndef OLDKERN
/* newer Kernels need the spinlock interrupt handler */
static voiddo_interrupt_handler(int irq,void*dev_id,struct pt_regs *regs)
{
unsigned long flags;

spin_lock_irqsave(&io_request_lock, flags);
interrupt_handler(irq, dev_id, regs);
spin_unlock_irqrestore(&io_request_lock, flags);
return;
}
#endif

static voidinterrupt_handler(int irq,void*dev_id,struct pt_regs *regs)
{
int host_index;
unsigned int intr_reg;
unsigned int cmd_result;
unsigned int ldn;
static unsigned long flags;
 Scsi_Cmnd *cmd;
int errorflag;
int interror;

 host_index=0;/* make sure, host_index is 0, else this won't work and
 never dare to ask, what happens, if an interrupt-handler
 does not work :-((( .... */

/* search for one adapter-response on shared interrupt */
while(hosts[host_index]
&& !(inb(IM_STAT_REG(host_index)) & IM_INTR_REQUEST))
 host_index++;

/* return if some other device on this IRQ caused the interrupt */
if(!hosts[host_index])return;

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

/*get command result and logical device */
 intr_reg =inb(IM_INTR_REG(host_index));
 cmd_result = intr_reg &0xf0;
 ldn = intr_reg &0x0f;

/*must wait for attention reg not busy, then send EOI to subsystem */
while(1)
{
#ifdef OLDKERN
save_flags(flags);
cli();
#else
spin_lock_irqsave(&intr_lock, flags);
#endif 
if(!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
break;
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&intr_lock, flags);
#endif
}
outb(IM_EOI | ldn,IM_ATTN_REG(host_index));
/* get the last_scsi_command here */
 interror =last_scsi_command(host_index)[ldn];
#ifdef OLDKERN
restore_flags(flags);
#else
spin_unlock_irqrestore(&intr_lock, flags);
#endif 
 errorflag =0;/* no errors by default */
/*these should never happen (hw fails, or a local programming bug) */
if(cmd_result == IM_ADAPTER_HW_FAILURE)
{
printk("\n");
printk("IBM MCA SCSI: ERROR - subsystem hardware failure!\n");
printk(" Last SCSI-command=0x%X, ldn=%d, host=%d.\n",
last_scsi_command(host_index)[ldn],ldn,host_index);
 errorflag =1;
}
if(cmd_result == IM_SOFTWARE_SEQUENCING_ERROR)
{
printk("\n");
printk("IBM MCA SCSI: ERROR - software sequencing error!\n");
printk(" Last SCSI-command=0x%X, ldn=%d, host=%d.\n",
last_scsi_command(host_index)[ldn],ldn,host_index);
 errorflag =1;
}
if(cmd_result == IM_CMD_ERROR)
{
printk("\n");
printk("IBM MCA SCSI: ERROR - command error!\n");
printk(" Last SCSI-command=0x%X, ldn=%d, host=%d.\n",
last_scsi_command(host_index)[ldn],ldn,host_index);
 errorflag =1;
}
if(errorflag)
{/* if errors appear, enter this section to give detailed info */
printk("IBM MCA SCSI: Subsystem Error-Status follows:\n");
printk(" Command Type................: %x\n",
last_scsi_type(host_index)[ldn]);
printk(" Attention Register..........: %x\n",
inb(IM_ATTN_REG(host_index)));
printk(" Basic Control Register......: %x\n",
inb(IM_CTR_REG(host_index)));
printk(" Interrupt Status Register...: %x\n",
 intr_reg);
printk(" Basic Status Register.......: %x\n",
inb(IM_STAT_REG(host_index)));
if((last_scsi_type(host_index)[ldn]==IM_SCB)||
(last_scsi_type(host_index)[ldn]==IM_LONG_SCB))
{
printk(" SCB End Status Word.........: %x\n",
ld(host_index)[ldn].tsb.end_status);
printk(" Command Status..............: %x\n",
ld(host_index)[ldn].tsb.cmd_status);
printk(" Device Status...............: %x\n",
ld(host_index)[ldn].tsb.dev_status);
printk(" Command Error...............: %x\n",
ld(host_index)[ldn].tsb.cmd_error);
printk(" Device Error................: %x\n",
ld(host_index)[ldn].tsb.dev_error);
printk(" Last SCB Address (LSW)......: %x\n",
ld(host_index)[ldn].tsb.low_of_last_scb_adr);
printk(" Last SCB Address (MSW)......: %x\n",
ld(host_index)[ldn].tsb.high_of_last_scb_adr);
}
printk(" Send report to the maintainer.\n");
panic("IBM MCA SCSI: Fatal errormessage from the subsystem!\n");
}

/* if no panic appeared, increase the interrupt-counter */
IBM_DS(host_index).total_interrupts++;

/*only for local checking phase */
if(local_checking_phase_flag(host_index))
{
stat_result(host_index) = cmd_result;
got_interrupt(host_index) =1;
reset_status(host_index) = IM_RESET_FINISHED_OK;
last_scsi_command(host_index)[ldn] = NO_SCSI;
return;
}
/*handling of commands coming from upper level of scsi driver */
else
{
if(last_scsi_type(host_index)[ldn] == IM_IMM_CMD)
{
/*verify ldn, and may handle rare reset immediate command */
if((reset_status(host_index) == IM_RESET_IN_PROGRESS)&&
(last_scsi_command(host_index)[ldn] == IM_RESET_IMM_CMD))
{
if(cmd_result == IM_CMD_COMPLETED_WITH_FAILURE)
{
 disk_rw_in_progress =0;
PS2_DISK_LED_OFF();
reset_status(host_index) = IM_RESET_FINISHED_FAIL;
}
else
{
/*reset disk led counter, turn off disk led */
 disk_rw_in_progress =0;
PS2_DISK_LED_OFF();
reset_status(host_index) = IM_RESET_FINISHED_OK;
}
stat_result(host_index) = cmd_result;
last_scsi_command(host_index)[ldn] = NO_SCSI;
return;
}
else if(last_scsi_command(host_index)[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(host_index)[ldn].cmd;
if(cmd_result == IM_CMD_COMPLETED_WITH_FAILURE)
 cmd->result = DID_NO_CONNECT <<16;
else
 cmd->result = DID_ABORT <<16;
stat_result(host_index) = cmd_result;
last_scsi_command(host_index)[ldn] = NO_SCSI;
if(cmd->scsi_done)
(cmd->scsi_done) (cmd);/* should be the internal_done */
return;
}
else
{
 disk_rw_in_progress =0;
PS2_DISK_LED_OFF();
reset_status(host_index) = IM_RESET_FINISHED_OK;
stat_result(host_index) = cmd_result;
last_scsi_command(host_index)[ldn] = NO_SCSI;
return;
}
}
last_scsi_command(host_index)[ldn] = NO_SCSI;
 cmd =ld(host_index)[ldn].cmd;
#ifdef IM_DEBUG_TIMEOUT
if(cmd)
{
if((cmd->target == TIMEOUT_PUN)&&(cmd->lun == TIMEOUT_LUN))
{
printk("IBM MCA SCSI: Ignoring interrupt from pun=%x, lun=%x.\n",
 cmd->target, cmd->lun);
return;
}
}
#endif
/*if no command structure, just return, else clear cmd */
if(!cmd)
return;
ld(host_index)[ldn].cmd = NULL;

#ifdef IM_DEBUG_INT
printk("cmd=%02x ireg=%02x ds=%02x cs=%02x de=%02x ce=%02x\n",
 cmd->cmnd[0], intr_reg,
ld(host_index)[ldn].tsb.dev_status,
ld(host_index)[ldn].tsb.cmd_status,
ld(host_index)[ldn].tsb.dev_error,
ld(host_index)[ldn].tsb.cmd_error);
#endif

/*if this is end of media read/write, may turn off PS/2 disk led */
if((ld(host_index)[ldn].device_type!=TYPE_NO_LUN)&&
(ld(host_index)[ldn].device_type!=TYPE_NO_DEVICE))
{/* only access this, if there was a valid device addressed */
switch(cmd->cmnd[0])
{
case READ_6:
case WRITE_6:
case READ_10:
case WRITE_10:
case READ_12:
case WRITE_12:
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-defintion, I suppose, it is a printing error in the
 * technical reference and assume as mask 0x3e. (ML) */
 cmd->result = (ld(host_index)[ldn].tsb.dev_status &0x3e);
/* write device status into cmd->result, and call done function */
if(cmd_result == IM_CMD_COMPLETED_WITH_FAILURE)
IBM_DS(host_index).total_errors++;
if(interror == NO_SCSI)/* unexpected interrupt :-( */
 cmd->result |= DID_BAD_INTR <<16;
else
 cmd->result |= DID_OK <<16;
(cmd->scsi_done) (cmd);
}
if(interror == NO_SCSI)
printk("IBM MCA SCSI: WARNING - Interrupt from non-pending SCSI-command!\n");
return;
}

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

static voidissue_cmd(int host_index,unsigned long cmd_reg,
unsigned char attn_reg)
{
static unsigned long flags;
/* must wait for attention reg not busy */
while(1)
{
#ifdef OLDKERN 
save_flags(flags);
cli();
#else
spin_lock_irqsave(&issue_lock, flags);
#endif 
if(!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
break;
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&issue_lock, flags);
#endif 
}
/*write registers and enable system interrupts */
outl(cmd_reg,IM_CMD_REG(host_index));
outb(attn_reg,IM_ATTN_REG(host_index));
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&issue_lock, flags);
#endif
}

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

static voidinternal_done(Scsi_Cmnd * cmd)
{
 cmd->SCp.Status++;
}

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

/* SCSI-SCB-command for device_inquiry */
static intdevice_inquiry(int host_index,int ldn)
{
int retries;
 Scsi_Cmnd cmd;
struct im_scb *scb;
struct im_tsb *tsb;
unsigned char*buf;

 scb = &(ld(host_index)[ldn].scb);
 tsb = &(ld(host_index)[ldn].tsb);
 buf = (unsigned char*)(&(ld(host_index)[ldn].buf));
ld(host_index)[ldn].tsb.dev_status =0;/* prepare stusblock */

if(bypass_controller)
{/* fill the commonly known field for device-inquiry SCSI cmnd */
 cmd.cmd_len =6;
memset(&(cmd.cmnd),0x0,sizeof(char) * cmd.cmd_len);
 cmd.cmnd[0] = INQUIRY;/* device inquiry */
 cmd.cmnd[4] =0xff;/* return buffer size = 255 */
}
for(retries =0; retries <3; retries++)
{
if(bypass_controller)
{/* bypass the hardware integrated command set */
 scb->command = IM_OTHER_SCSI_CMD_CMD;
 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT;
 scb->u1.scsi_cmd_length = cmd.cmd_len;
memcpy(scb->u2.scsi_command, &(cmd.cmnd), cmd.cmd_len);
last_scsi_command(host_index)[ldn] = INQUIRY;
last_scsi_type(host_index)[ldn] = IM_SCB;
}
else
{
/*fill scb with inquiry command */
 scb->command = IM_DEVICE_INQUIRY_CMD;
 scb->enable = IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT;
last_scsi_command(host_index)[ldn] = IM_DEVICE_INQUIRY_CMD;
last_scsi_type(host_index)[ldn] = IM_SCB;
}
 scb->sys_buf_adr =virt_to_bus(buf);
 scb->sys_buf_length =0xff;/* maximum bufferlength gives max info */
 scb->tsb_adr =virt_to_bus(tsb);

/*issue scb to passed ldn, and busy wait for interrupt */
got_interrupt(host_index) =0;
issue_cmd(host_index,virt_to_bus(scb), IM_SCB | ldn);
while(!got_interrupt(host_index))
barrier();

/*if command succesful, break */
if((stat_result(host_index) == IM_SCB_CMD_COMPLETED)||
(stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
{
return1;
}
}

/*if all three retries failed, return "no device at this ldn" */
if(retries >=3)
return0;
else
return1;
}

static intread_capacity(int host_index,int ldn)
{
int retries;
 Scsi_Cmnd cmd;
struct im_scb *scb;
struct im_tsb *tsb;
unsigned char*buf;

 scb = &(ld(host_index)[ldn].scb);
 tsb = &(ld(host_index)[ldn].tsb);
 buf = (unsigned char*)(&(ld(host_index)[ldn].buf));
ld(host_index)[ldn].tsb.dev_status =0;

if(bypass_controller)
{/* read capacity in commonly known default SCSI-format */
 cmd.cmd_len =10;
memset(&(cmd.cmnd),0x0,sizeof(char) * cmd.cmd_len);
 cmd.cmnd[0] = READ_CAPACITY;/* read capacity */
}
for(retries =0; retries <3; retries++)
{
/*fill scb with read capacity command */
if(bypass_controller)
{/* bypass the SCSI-command */
 scb->command = IM_OTHER_SCSI_CMD_CMD;
 scb->enable |= IM_READ_CONTROL;
 scb->u1.scsi_cmd_length = cmd.cmd_len;
memcpy(scb->u2.scsi_command, &(cmd.cmnd), cmd.cmd_len);
last_scsi_command(host_index)[ldn] = READ_CAPACITY;
last_scsi_type(host_index)[ldn] = IM_SCB;
}
else
{
 scb->command = IM_READ_CAPACITY_CMD;
 scb->enable = IM_READ_CONTROL;
last_scsi_command(host_index)[ldn] = IM_READ_CAPACITY_CMD;
last_scsi_type(host_index)[ldn] = IM_SCB;
}
 scb->sys_buf_adr =virt_to_bus(buf);
 scb->sys_buf_length =8;
 scb->tsb_adr =virt_to_bus(tsb);

/*issue scb to passed ldn, and busy wait for interrupt */
got_interrupt(host_index) =0;
issue_cmd(host_index,virt_to_bus(scb), IM_SCB | ldn);
while(!got_interrupt(host_index))
barrier();

/*if got capacity, get block length and return one device found */
if((stat_result(host_index) == IM_SCB_CMD_COMPLETED)||
(stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
{
return1;
}
}
/*if all three retries failed, return "no device at this ldn" */
if(retries >=3)
return0;
else
return1;
}

/* 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 intimmediate_assign(int host_index,unsigned int pun,
unsigned int lun,unsigned int ldn,
unsigned int operation)
{
int retries;
unsigned long imm_command;

for(retries=0; retries<3; retries ++)
{
 imm_command =inl(IM_CMD_REG(host_index));
 imm_command &= (unsigned long)(0xF8000000);/* keep reserved bits */
 imm_command |= (unsigned long)(IM_ASSIGN_IMM_CMD);
 imm_command |= (unsigned long)((lun &7) <<24);
 imm_command |= (unsigned long)((operation &1) <<23);
 imm_command |= (unsigned long)((pun &7) <<20);
 imm_command |= (unsigned long)((ldn &15) <<16);

last_scsi_command(host_index)[0xf] = IM_ASSIGN_IMM_CMD;
last_scsi_type(host_index)[0xf] = IM_IMM_CMD;
got_interrupt(host_index) =0;
issue_cmd(host_index, (unsigned long)(imm_command), IM_IMM_CMD |0xf);
while(!got_interrupt(host_index))
barrier();

/*if command succesful, break */
if(stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
{
return1;
}
}

if(retries >=3)
return0;
else
return1;
}

#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
static intimmediate_reset(int host_index,unsigned int ldn)
{
int retries;
int ticks;
unsigned long imm_command;

for(retries=0; retries<3; retries ++)
{
 imm_command =inl(IM_CMD_REG(host_index));
 imm_command &= (unsigned long)(0xFFFF0000);/* keep reserved bits */
 imm_command |= (unsigned long)(IM_RESET_IMM_CMD);
last_scsi_command(host_index)[ldn] = IM_RESET_IMM_CMD;
last_scsi_type(host_index)[ldn] = IM_IMM_CMD;

got_interrupt(host_index) =0;
reset_status(host_index) = IM_RESET_IN_PROGRESS;
issue_cmd(host_index, (unsigned long)(imm_command), IM_IMM_CMD | ldn);
 ticks = IM_RESET_DELAY*HZ;
while(reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks)
{
mdelay(1+999/HZ);
barrier();
}
/* if reset did not complete, just claim */
if(!ticks)
{
printk("IBM MCA SCSI: reset did not complete within %d seconds.\n",
 IM_RESET_DELAY);
reset_status(host_index) = IM_RESET_FINISHED_OK;
/* did not work, finish */
return1;
}
/*if command succesful, break */
if(stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
{
return1;
}
}

if(retries >=3)
return0;
else
return1;
}
#endif

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

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

 answer[1] = (char)(0x0);
if(value<=MAX_LOG_DEV)
 answer[0] = hex[value];
else
 answer[0] ='-';

return(char*)&answer;
}

/* 
 The following routine probes the SCSI-devices in four steps:
 1. The current ldn -> pun,lun mapping is removed on the SCSI-adapter.
 2. ldn 0 is used to go through all possible combinations of pun,lun and
 a device_inquiry is done to fiddle out whether there is a device
 responding or not. This physical map is stored in get_scsi[][].
 3. The 15 available ldns (0-14) are mapped to existing pun,lun.
 If there are more devices than ldns, it stops at 14 for the boot
 time. Dynamical remapping will be done in ibmmca_queuecommand.
 4. If there are less than 15 valid pun,lun, the remaining ldns are
 mapped to NON-existing pun,lun to satisfy the adapter. Information
 about pun,lun -> ldn is stored as before in get_ldn[][].
 This method leads to the result, that the SCSI-pun,lun shown to Linux
 mid-level- and higher-level-drivers is exactly corresponding to the
 physical reality on the SCSI-bus. Therefore, it is possible that users
 of older releases of this driver have to rewrite their fstab-file, because
 the /dev/sdXXX could have changed due to the right pun,lun report, now.
 The assignment of ALL ldns avoids dynamical remapping by the adapter
 itself.
 */
static voidcheck_devices(int host_index)
{
int id, lun, ldn, ticks;
int count_devices;/* local counter for connected device */

/* assign default values to certain variables */

 ticks =0;
 count_devices =0;
IBM_DS(host_index).dyn_flag =0;/* normally no need for dynamical ldn management */
IBM_DS(host_index).total_errors =0;/* set errorcounter to 0 */
next_ldn(host_index) =7;/* next ldn to be assigned is 7, because 0-6 is 'hardwired'*/
for(ldn=0; ldn<=MAX_LOG_DEV; ldn++)
{
last_scsi_command(host_index)[ldn] = NO_SCSI;/* emptify last SCSI-command storage */
last_scsi_type(host_index)[ldn] =0;
}

/* initialize the very important driver-informational arrays/structs */
memset(ld(host_index),0,
sizeof(ld(host_index)));
memset(get_ldn(host_index), TYPE_NO_DEVICE,
sizeof(get_ldn(host_index)));/* this is essential ! */
memset(get_scsi(host_index), TYPE_NO_DEVICE,
sizeof(get_scsi(host_index)));/* this is essential ! */

for(lun=0; lun<8; lun++)/* mark the adapter at its pun on all luns*/
{
get_scsi(host_index)[subsystem_pun(host_index)][lun] = TYPE_IBM_SCSI_ADAPTER;
get_ldn(host_index)[subsystem_pun(host_index)][lun] = MAX_LOG_DEV;/* make sure, the subsystem
 ldn is active for all
 luns. */
}

/* STEP 1: */
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Current SCSI-host index: %d\n",host_index);
#endif
printk("IBM MCA SCSI: Removing default logical SCSI-device mapping.");
for(ldn=0; ldn<MAX_LOG_DEV; ldn++)
{
#ifdef IM_DEBUG_PROBE
printk(".");
#endif
immediate_assign(host_index,0,0,ldn,REMOVE_LDN);/* remove ldn (wherever)*/
}

 lun =0;/* default lun is 0 */

/* STEP 2: */
printk("\nIBM MCA SCSI: Probing SCSI-devices.");
for(id=0; id<8; id++)
#ifdef CONFIG_SCSI_MULTI_LUN
for(lun=0; lun<8; lun++)
#endif
{
#ifdef IM_DEBUG_PROBE
printk(".");
#endif
if(id !=subsystem_pun(host_index))
{/* if pun is not the adapter: */
/*set ldn=0 to pun,lun*/
immediate_assign(host_index,id,lun,PROBE_LDN,SET_LDN);
if(device_inquiry(host_index, PROBE_LDN))/* probe device */
{
get_scsi(host_index)[id][lun]=
(unsigned char)(ld(host_index)[PROBE_LDN].buf[0]);
/* entry, even for NO_LUN */
if(ld(host_index)[PROBE_LDN].buf[0] != TYPE_NO_LUN)
 count_devices++;/* a existing device is found */
}
/* remove ldn */
immediate_assign(host_index,id,lun,PROBE_LDN,REMOVE_LDN);
}
}

/* STEP 3: */
printk("\nIBM MCA SCSI: Mapping SCSI-devices.");

 ldn =0;
 lun =0;

#ifdef CONFIG_SCSI_MULTI_LUN 
for(lun=0; lun<8&& ldn<MAX_LOG_DEV; lun++)
#endif
for(id=0; id<8&& ldn<MAX_LOG_DEV; id++)
{
#ifdef IM_DEBUG_PROBE
printk(".");
#endif
if(id !=subsystem_pun(host_index))
{
if(get_scsi(host_index)[id][lun] != TYPE_NO_LUN &&
get_scsi(host_index)[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(host_index,id,lun,ldn,SET_LDN);
get_ldn(host_index)[id][lun]=ldn;/* map ldn */
if(device_exists(host_index, ldn,
&ld(host_index)[ldn].block_length,
&ld(host_index)[ldn].device_type))
{
#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
printk("resetting device at ldn=%x ... ",ldn);
immediate_reset(host_index,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(host_index)[id][lun]=TYPE_NO_DEVICE;
immediate_assign(host_index,0,0,ldn,REMOVE_LDN);
}
else ldn++;
}
}
else if(lun ==0)
{
/* map lun == 0, even if no device exists */
immediate_assign(host_index,id,lun,ldn,SET_LDN);
get_ldn(host_index)[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<8&& ldn<MAX_LOG_DEV; id++)
{
if(get_scsi(host_index)[id][lun] == TYPE_NO_LUN ||
get_scsi(host_index)[id][lun] == TYPE_NO_DEVICE)
{
/* 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(host_index,id,lun,ldn,SET_LDN);
get_ldn(host_index)[id][lun]=ldn;
 ldn++;
}
}

printk("\n");
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");

#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<8; id++)
{
printk("%2d ",id);
for(lun=0; lun<8; lun++)
printk("%2s ",ti_p(get_scsi(host_index)[id][lun]));
printk(" %2d ",id);
for(lun=0; lun<8; lun++)
printk("%2s ",ti_l(get_ldn(host_index)[id][lun]));
printk("\n");
}
#endif

/* assign total number of found SCSI-devices to the statistics struct */
IBM_DS(host_index).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(host_index).dyn_flag =1;/* dynamical assignment is necessary */
else
IBM_DS(host_index).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(host_index).total_accesses =0;
IBM_DS(host_index).total_interrupts =0;
IBM_DS(host_index).dynamical_assignments =0;
memset(IBM_DS(host_index).ldn_access,0x0,
sizeof(IBM_DS(host_index).ldn_access));
memset(IBM_DS(host_index).ldn_read_access,0x0,
sizeof(IBM_DS(host_index).ldn_read_access));
memset(IBM_DS(host_index).ldn_write_access,0x0,
sizeof(IBM_DS(host_index).ldn_write_access));
memset(IBM_DS(host_index).ldn_inquiry_access,0x0,
sizeof(IBM_DS(host_index).ldn_inquiry_access));
memset(IBM_DS(host_index).ldn_modeselect_access,0x0,
sizeof(IBM_DS(host_index).ldn_modeselect_access));
memset(IBM_DS(host_index).ldn_assignments,0x0,
sizeof(IBM_DS(host_index).ldn_assignments));

return;
}

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

static intdevice_exists(int host_index,int ldn,int*block_length,
int*device_type)
{
unsigned char*buf;

/* if no valid device found, return immediately with 0 */
if(!(device_inquiry(host_index, ldn)))
return0;

 buf = (unsigned char*)(&(ld(host_index)[ldn].buf));

/*if device is CD_ROM, assume block size 2048 and return */
if(*buf == TYPE_ROM)
{
*device_type = TYPE_ROM;
*block_length =2048;/* (standard blocksize for yellow-/red-book) */
return1;
}

if(*buf == TYPE_WORM)/* CD-burner, WORM, Linux handles this as CD-ROM 
 therefore, the block_length is also 2048. */
{
*device_type = TYPE_WORM;
*block_length =2048;
return1;
}

/* if device is disk, use "read capacity" to find its block size */
if(*buf == TYPE_DISK)
{
*device_type = TYPE_DISK;
if(read_capacity( host_index, ldn))
{
*block_length = *(buf+7) + (*(buf+6) <<8) +
(*(buf+5) <<16) + (*(buf+4) <<24);
return1;
}
else
return0;
}

/* if this is a magneto-optical drive, treat it like a harddisk */
if(*buf == TYPE_MOD)
{
*device_type = TYPE_MOD;
if(read_capacity( host_index, ldn))
{
*block_length = *(buf+7) + (*(buf+6) <<8) +
(*(buf+5) <<16) + (*(buf+4) <<24);
return1;
}
else
return0;
}

if(*buf == TYPE_TAPE)/* TAPE-device found */
{
*device_type = TYPE_TAPE;
*block_length =0;/* not in use (setting by mt and mtst in op.) */
return1;
}

if(*buf == TYPE_PROCESSOR)/* HP-Scanners, diverse SCSI-processing units*/
{
*device_type = TYPE_PROCESSOR;
*block_length =0;/* they set their stuff on drivers */
return1;
}

if(*buf == TYPE_SCANNER)/* other SCSI-scanners */
{
*device_type = TYPE_SCANNER;
*block_length =0;/* they set their stuff on drivers */
return1;
}

if(*buf == TYPE_MEDIUM_CHANGER)/* Medium-Changer */
{
*device_type = TYPE_MEDIUM_CHANGER;
*block_length =0;/* One never knows, what to expect on a medium
 changer device. */
return1;
}

/* Up to now, no SCSI-devices that are known up to kernel 2.1.31 are
 ignored! MO-drives are now supported and treated as harddisk. */
return0;
}

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

#ifdef CONFIG_SCSI_IBMMCA

voidibmmca_scsi_setup(char*str,int*ints)
{
int i, j, io_base, id_base;
char*token;

 io_base =0;
 id_base =0;

if(str)
{
 token =strtok(str,",");
 j =0;
while(token)
{
if(!strcmp(token,"display"))
{
 use_display =1;
}
if(!strcmp(token,"adisplay"))
{
 use_adisplay =1;
}
if(!strcmp(token,"bypass"))
{
 bypass_controller =1;
}
if(!strcmp(token,"normal"))
{
 ibm_ansi_order =0;
}
if(!strcmp(token,"ansi"))
{
 ibm_ansi_order =1;
}
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++;
}
 token =strtok(NULL,",");
}
}
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;
}

#endif

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

static intibmmca_getinfo(char*buf,int slot,void*dev)
{
struct Scsi_Host *shpnt;
int len, special;
unsigned int pos2, pos3;
static unsigned long flags;

#ifdef OLDKERN 
save_flags(flags);
cli();
#else
spin_lock_irqsave(&info_lock, flags);
#endif 

 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 */
 special = ((struct ibmmca_hostdata *)shpnt->hostdata)->_special;
 pos2 = ((struct ibmmca_hostdata *)shpnt->hostdata)->_pos2;
 pos3 = ((struct ibmmca_hostdata *)shpnt->hostdata)->_pos3;

if(special == FORCED_DETECTION)/* forced detection */
{
 len +=sprintf(buf + len,"Adapter cathegory: forced detected\n");
 len +=sprintf(buf + len,"***************************************\n");
 len +=sprintf(buf + len,"*** Forced detected SCSI Adapter ***\n");
 len +=sprintf(buf + len,"*** No chip-information available ***\n");
 len +=sprintf(buf + len,"***************************************\n");
}
else if(special == INTEGRATED_SCSI)
{/* if the integrated subsystem has been found automatically: */
 len +=sprintf(buf + len,"Adapter cathegory: integrated\n");
 len +=sprintf(buf + len,"Chip revision level: %d\n",
((pos2 &0xf0) >>4));
 len +=sprintf(buf + len,"Chip status: %s\n",
(pos2 &1) ?"enabled":"disabled");
 len +=sprintf(buf + len,"8 kByte NVRAM status: %s\n",
(pos2 &2) ?"locked":"accessible");
}
else if((special>=0)&&
(special<(sizeof(subsys_list)/sizeof(struct subsys_list_struct))))
{/* if the subsystem is a slot adapter */
 len +=sprintf(buf + len,"Adapter cathegory: slot-card\n");
 len +=sprintf(buf + len,"Chip revision level: %d\n",
((pos2 &0xf0) >>4));
 len +=sprintf(buf + len,"Chip status: %s\n",
(pos2 &1) ?"enabled":"disabled");
 len +=sprintf(buf + len,"Port offset: 0x%x\n",
((pos2 &0x0e) <<2));
}
else
{
 len +=sprintf(buf + len,"Adapter cathegory: 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",
(unsigned int)(shpnt->io_port),
(unsigned int)(shpnt->io_port+7));
/* Now make sure, the bufferlength is devideable 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");

#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&info_lock, flags);
#endif 
return len;
}

intibmmca_detect(Scsi_Host_Template * scsi_template)
{
struct Scsi_Host *shpnt;
int port, id, i, j, list_size, slot;

 found =0;/* make absolutely sure, that found is set to 0 */

/* if this is not MCA machine, return "nothing found" */
if(!MCA_bus)
{
printk("IBM MCA SCSI: No Microchannel-bus support present -> Aborting.\n");
return0;
}
else
printk("IBM MCA SCSI: Version %s\n",IBMMCA_SCSI_DRIVER_VERSION);

/* get interrupt request level */
#ifdef OLDKERN
if(request_irq(IM_IRQ, interrupt_handler, SA_SHIRQ,"ibmmcascsi",
 hosts))
#else
if(request_irq(IM_IRQ, do_interrupt_handler, SA_SHIRQ,"ibmmcascsi",
 hosts))
#endif
{
printk("IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ);
return0;
}

/* if ibmmcascsi setup option was passed to kernel, return "found" */
for(i =0; i < IM_MAX_HOSTS; i++)
if(io_port[i] >0&& scsi_id[i] >=0&& scsi_id[i] <8)
{
printk("IBM MCA SCSI: forced detected SCSI Adapter, io=0x%x, scsi id=%d.\n",
 io_port[i], scsi_id[i]);
if((shpnt =ibmmca_register(scsi_template, io_port[i], scsi_id[i],
"forced detected SCSI Adapter")))
{
((struct ibmmca_hostdata *)shpnt->hostdata)->_pos2 =0;
((struct ibmmca_hostdata *)shpnt->hostdata)->_pos3 =0;
((struct ibmmca_hostdata *)shpnt->hostdata)->_special =
 FORCED_DETECTION;
mca_set_adapter_name(MCA_INTEGSCSI,"forced detected SCSI Adapter");
mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo,
 shpnt);
mca_mark_as_used(MCA_INTEGSCSI);
}
}
if(found)return found;

/* 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_read_stored_pos(MCA_INTEGSCSI,j);
/* pos2 = pos3 = 0xff if there is no integrated SCSI-subsystem present */
if(( pos[2] !=0xff) || (pos[3] !=0xff))
{
if((pos[2] &1) ==1)/* is the subsystem chip enabled ? */
{
 port = IM_IO_PORT;
}
else
{/* if disabled, no IRQs will be generated, as the chip won't
 * listen to the incomming commands and will do really nothing,
 * except for listening to the pos-register settings. If this
 * happens, I need to hugely think about it, as one has to
 * write something to the MCA-Bus pos register in order to
 * enable the chip. Normally, IBM-SCSI won't pass the POST,
 * when the chip is disabled (see IBM tech. ref.). */
 port = IM_IO_PORT;/* anyway, set the portnumber and warn */
printk("IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
printk(" SCSI-operations may not work.\n");
}
 id = (pos[3] &0xe0) >>5;/* this is correct and represents the PUN */

/* give detailed information on the subsystem. This helps me 
 * additionally during debugging and analyzing bug-reports. */
printk("IBM MCA SCSI: IBM Integrated SCSI Controller found, io=0x%x, scsi id=%d,\n",
 port, id);
printk(" chip rev.=%d, 8K NVRAM=%s, subsystem=%s\n",
((pos[2] &0xf0) >>4), (pos[2] &2) ?"locked":"accessible",
(pos[2] &1) ?"enabled.":"disabled.");

/* register the found integrated SCSI-subsystem */
if((shpnt =ibmmca_register(scsi_template, port, id,
"IBM Integrated SCSI Controller")))
{
((struct ibmmca_hostdata *)shpnt->hostdata)->_pos2 = pos[2];
((struct ibmmca_hostdata *)shpnt->hostdata)->_pos3 = pos[3];
((struct ibmmca_hostdata *)shpnt->hostdata)->_special =
 INTEGRATED_SCSI;
mca_set_adapter_name(MCA_INTEGSCSI,"IBM Integrated SCSI Controller");
mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo,
 shpnt);
mca_mark_as_used(MCA_INTEGSCSI);
}
}

/* now look for other adapters in MCA slots, */
/* determine the number of known IBM-SCSI-subsystem types */
/* see the pos[2] dependence to get the adapter port-offset. */
 list_size =sizeof(subsys_list) /sizeof(struct subsys_list_struct);
for(i =0; i < list_size; i++)
{/* scan each slot for a fitting adapter id */
 slot =0;/* start at slot 0 */
while((slot =mca_find_adapter(subsys_list[i].mca_id, slot))
!= MCA_NOTFOUND)
{/* scan through all slots */
for(j=0;j<8;j++)/* read the pos-information */
 pos[j] =mca_read_stored_pos(slot, j);
if((pos[2] &1) ==1)/* is the subsystem chip enabled ? */
{/* (explanations see above) */
 port = IM_IO_PORT + ((pos[2] &0x0e) <<2);
}
else
{/* anyway, set the portnumber and warn */
 port = IM_IO_PORT + ((pos[2] &0x0e) <<2);
printk("IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
printk(" SCSI-operations may not work.\n");
}
 id = (pos[3] &0xe0) >>5;/* get subsystem PUN */
printk("IBM MCA SCSI: %s found in slot %d, io=0x%x, scsi id=%d,\n",
 subsys_list[i].description, slot +1, port, id);
printk(" chip rev.=%d, port-offset=0x%x, subsystem=%s\n",
((pos[2] &0xf0) >>4),
((pos[2] &0x0e) <<2),
(pos[2] &1) ?"enabled.":"disabled.");

/* register the hostadapter */
if((shpnt =ibmmca_register(scsi_template, port, id,
 subsys_list[i].description)))
{
((struct ibmmca_hostdata *)shpnt->hostdata)->_pos2 = pos[2];
((struct ibmmca_hostdata *)shpnt->hostdata)->_pos3 = pos[3];
((struct ibmmca_hostdata *)shpnt->hostdata)->_special = i;

mca_set_adapter_name(slot, subsys_list[i].description);
mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmmca_getinfo,
 shpnt);
mca_mark_as_used(slot);
}
 slot++;/* advance to next slot */
}/* advance to next adapter id in the list of IBM-SCSI-subsystems*/
}

if(!found)
{/* maybe ESDI, or other producers' SCSI-hosts */
free_irq(IM_IRQ, hosts);
printk("IBM MCA SCSI: No IBM SCSI-subsystem adapter attached.\n");
}
return found;/* return the number of found SCSI hosts. Should be 1 or 0. */
}

static struct Scsi_Host *
ibmmca_register(Scsi_Host_Template * scsi_template,int port,int id,
char*hostname)
{
struct Scsi_Host *shpnt;
int i, j;
unsigned int ctrl;

/* check I/O region */
if(check_region(port, IM_N_IO_PORT))
{
printk("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);
return NULL;
}

/* register host */
 shpnt =scsi_register(scsi_template,sizeof(struct ibmmca_hostdata));
if(!shpnt)
{
printk("IBM MCA SCSI: Unable to register host.\n");
return NULL;
}

/* request I/O region */
request_region(port, IM_N_IO_PORT, hostname);

 hosts[found] = shpnt;/* add new found hostadapter to the list */
 shpnt->irq = IM_IRQ;/* assign necessary stuff for the adapter */
 shpnt->io_port = port;
 shpnt->n_io_port = IM_N_IO_PORT;
 shpnt->this_id = id;
/* now, the SCSI-subsystem is connected to Linux */

 ctrl = (unsigned int)(inb(IM_CTR_REG(found)));/* get control-register status */
#ifdef IM_DEBUG_PROBE
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");
if(bypass_controller)
printk("IBM MCA SCSI: Subsystem SCSI-commands get bypassed.\n");
#endif

reset_status(found) = IM_RESET_NOT_IN_PROGRESS;

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

/* check which logical devices exist */
local_checking_phase_flag(found) =1;
check_devices(found);/* call by value, using the global variable hosts*/
local_checking_phase_flag(found) =0;

 found++;/* now increase index to be prepared for next found subsystem */
/* an ibm mca subsystem has been detected */
return shpnt;
}

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

intibmmca_command(Scsi_Cmnd * cmd)
{
ibmmca_queuecommand(cmd, internal_done);
 cmd->SCp.Status =0;
while(!cmd->SCp.Status)
barrier();
return cmd->result;
}

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

intibmmca_release(struct Scsi_Host *shpnt)
{
release_region(shpnt->io_port, shpnt->n_io_port);
if(!(--found))
free_irq(shpnt->irq, hosts);
return0;
}

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

/* The following routine is the SCSI command queue. The old edition is
 now improved by dynamical reassignment of ldn numbers that are 
 currently not assigned. The mechanism works in a way, that first
 the physical structure is checked. If at a certain pun,lun a device
 should be present, the routine proceeds to the ldn check from
 get_ldn. An answer of 0xff would show-up, that the aimed device is
 currently not assigned any ldn. At this point, the dynamical 
 remapping algorithm is called. It works in a way, that it goes in
 cyclic order through the ldns from 7 to 14. If a ldn is assigned,
 it takes 8 dynamical reassignment calls, until a device looses its
 ldn again. With this method it is assured, that while doing 
 intense I/O between up to eight devices, no dynamical remapping is
 done there. ldns 0 through 6(!) are left untouched, which means, that
 puns 0 through 7(!) on lun=0 are always accessible without remapping.
 These ldns are statically assigned by this driver. The subsystem always 
 occupies at least one pun, therefore 7 ldns (at lun=0) for other devices 
 are sufficient. (The adapter uses always ldn=15, at whatever pun it is.) */
intibmmca_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 host_index;

if(ibm_ansi_order)
 target =6- cmd->target;
else
 target = cmd->target;

 shpnt = cmd->host;

/* search for the right hostadapter */
for(host_index =0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);

if(!hosts[host_index])
{/* invalid hostadapter descriptor address */
 cmd->result = DID_NO_CONNECT <<16;
done(cmd);
return0;
}

/*if (target,lun) is NO LUN or not existing at all, return error */
if((get_scsi(host_index)[target][cmd->lun] == TYPE_NO_LUN)||
(get_scsi(host_index)[target][cmd->lun] == TYPE_NO_DEVICE))
{
 cmd->result = DID_NO_CONNECT <<16;
done(cmd);
return0;
}

/*if (target,lun) unassigned, do further checks... */
 ldn =get_ldn(host_index)[target][cmd->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(host_index);/* stop-value for one circle */
while(ld(host_index)[next_ldn(host_index)].cmd)/* search for a occupied, but not in */
{/* command-processing ldn. */
next_ldn(host_index)++;
if(next_ldn(host_index)>=MAX_LOG_DEV)
next_ldn(host_index) =7;
if(current_ldn ==next_ldn(host_index))/* One circle done ? */
{/* no non-processing ldn found */
printk("IBM MCA SCSI: Cannot assign SCSI-device dynamically!\n");
printk(" On ldn 7-14 SCSI-commands everywhere in progress.\n");
printk(" Reporting DID_NO_CONNECT for device (%d,%d).\n",
 target, cmd->lun);
 cmd->result = DID_NO_CONNECT <<16;/* return no connect*/
done(cmd);
return0;
}
}

/* unmap non-processing ldn */
for(id=0; id<8; id ++)
for(lun=0; lun<8; lun++)
{
if(get_ldn(host_index)[id][lun] ==next_ldn(host_index))
{
get_ldn(host_index)[id][lun] = TYPE_NO_DEVICE;
/* unmap entry */
}
}
/* set reduced interrupt_handler-mode for checking */
local_checking_phase_flag(host_index) =1;
/* unassign found ldn (pun,lun does not matter for remove) */
immediate_assign(host_index,0,0,next_ldn(host_index),REMOVE_LDN);
/* assign found ldn to aimed pun,lun */
immediate_assign(host_index,target,cmd->lun,next_ldn(host_index),SET_LDN);
/* map found ldn to pun,lun */
get_ldn(host_index)[target][cmd->lun] =next_ldn(host_index);
/* change ldn to the right value, that is now next_ldn */
 ldn =next_ldn(host_index);
/* get device information for ld[ldn] */
if(device_exists(host_index, ldn,
&ld(host_index)[ldn].block_length,
&ld(host_index)[ldn].device_type))
{
ld(host_index)[ldn].cmd =0;/* To prevent panic set 0, because
 devices that were not assigned,
 should have nothing in progress. */

/* increase assignment counters for statistics in /proc */
IBM_DS(host_index).dynamical_assignments++;
IBM_DS(host_index).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->lun);

/* set back to normal interrupt_handling */
local_checking_phase_flag(host_index) =0;

/* Information on syslog terminal */
printk("IBM MCA SCSI: ldn=0x%x dynamically reassigned to (%d,%d).\n",
 ldn, target, cmd->lun);

/* increase next_ldn for next dynamical assignment */
next_ldn(host_index)++;
if(next_ldn(host_index)>=MAX_LOG_DEV)
next_ldn(host_index) =7;
}
else
{/* wall against Linux accesses to the subsystem adapter */
 cmd->result = DID_BAD_TARGET <<16;
done(cmd);
return0;
}
}

/*verify there is no command already in progress for this log dev */
if(ld(host_index)[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(host_index)[ldn].cmd = cmd;

/*fill scb information independent of the scsi command */
 scb = &(ld(host_index)[ldn].scb);
ld(host_index)[ldn].tsb.dev_status =0;
 scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR;
 scb->tsb_adr =virt_to_bus(&(ld(host_index)[ldn].tsb));
if(cmd->use_sg)
{
int i = cmd->use_sg;
struct scatterlist *sl = (struct scatterlist *) cmd->request_buffer;
if(i >16)
panic("IBM MCA SCSI: scatter-gather list too long.\n");
while(--i >=0)
{
ld(host_index)[ldn].sge[i].address = (void*)virt_to_bus(sl[i].address);
ld(host_index)[ldn].sge[i].byte_length = sl[i].length;
}
 scb->enable |= IM_POINTER_TO_LIST;
 scb->sys_buf_adr =virt_to_bus(&(ld(host_index)[ldn].sge[0]));
 scb->sys_buf_length = cmd->use_sg *sizeof(struct im_sge);
}
else
{
 scb->sys_buf_adr =virt_to_bus(cmd->request_buffer);
 scb->sys_buf_length = cmd->request_bufflen;
}

/*fill scb information dependent on scsi command */
 scsi_cmd = cmd->cmnd[0];

#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(host_index)[ldn].device_type==IM_DEBUG_CMD_DEVICE)
printk("(SCSI-device-type=0x%x) issue scsi cmd=%02x to ldn=%d\n",
ld(host_index)[ldn].device_type, scsi_cmd, ldn);
#endif

/* for possible panics store current command */
last_scsi_command(host_index)[ldn] = scsi_cmd;
last_scsi_type(host_index)[ldn] = IM_SCB;

/* update statistical info */
IBM_DS(host_index).total_accesses++;
IBM_DS(host_index).ldn_access[ldn]++;

switch(scsi_cmd)
{
case READ_6:
case WRITE_6:
case READ_10:
case WRITE_10:
case READ_12:
case WRITE_12:
/* statistics for proc_info */
if((scsi_cmd == READ_6)||(scsi_cmd == READ_10)||(scsi_cmd == READ_12))
IBM_DS(host_index).ldn_read_access[ldn]++;/* increase READ-access on ldn stat. */
else if((scsi_cmd == WRITE_6)||(scsi_cmd == WRITE_10)||
(scsi_cmd == WRITE_12))
IBM_DS(host_index).ldn_write_access[ldn]++;/* increase write-count on ldn stat.*/

/* 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(host_index)[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 */
if(bypass_controller)
{
 scb->command = IM_OTHER_SCSI_CMD_CMD;
 scb->enable |= IM_READ_CONTROL;
 scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command,cmd->cmnd,cmd->cmd_len);
}
else
{
 scb->command = IM_READ_DATA_CMD;
 scb->enable |= IM_READ_CONTROL;
}
}
else
{/* write command preparations */
if(bypass_controller)
{
 scb->command = IM_OTHER_SCSI_CMD_CMD;
 scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command,cmd->cmnd,cmd->cmd_len);
}
else
{
 scb->command = IM_WRITE_DATA_CMD;
}
}

if(!bypass_controller)
{
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);
}
 scb->u2.blk.length =ld(host_index)[ldn].block_length;
}
if(++disk_rw_in_progress ==1)
PS2_DISK_LED_ON(shpnt->host_no, target);
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. 
 Good/modern CD-ROM-drives are capable of
 reading sequential AND random-access. This leads to the problem,
 that random-accesses are covered by the subsystem, but 
 sequentials are not, as like for tape-drives. Therefore, it is
 the easiest way to use IM_OTHER_SCSI_CMD_CMD for all read-ops
 on CD-ROM-drives in order not to run into timing problems and
 to have a stable state. In addition, data-access on CD-ROMs
 works faster like that. Strange, but obvious. */

 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->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);

/* Read/write on this non-disk devices is also displayworthy, 
 so flash-up the LED/display. */
if(++disk_rw_in_progress ==1)
PS2_DISK_LED_ON(shpnt->host_no, target);
break;
}
break;
case INQUIRY:
IBM_DS(host_index).ldn_inquiry_access[ldn]++;
if(bypass_controller)
{
 scb->command = IM_OTHER_SCSI_CMD_CMD;
 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT;
 scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
}
else
{
 scb->command = IM_DEVICE_INQUIRY_CMD;
 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT;
}
break;

case READ_CAPACITY:
/* the length of system memory buffer must be exactly 8 bytes */
if(scb->sys_buf_length >8)
 scb->sys_buf_length =8;
if(bypass_controller)
{
 scb->command = IM_OTHER_SCSI_CMD_CMD;
 scb->enable |= IM_READ_CONTROL;
 scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
}
else
{
 scb->command = IM_READ_CAPACITY_CMD;
 scb->enable |= IM_READ_CONTROL;
}
break;

/* Commands that need read-only-mode (system <- device): */
case REQUEST_SENSE:
if(bypass_controller)
{
 scb->command = IM_OTHER_SCSI_CMD_CMD;
 scb->enable |= IM_READ_CONTROL;
 scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
}
else
{
 scb->command = IM_REQUEST_SENSE_CMD;
 scb->enable |= IM_READ_CONTROL;
}
break;

/* Commands that need write-only-mode (system -> device): */
case MODE_SELECT:
case MODE_SELECT_10:
IBM_DS(host_index).ldn_modeselect_access[ldn]++;
 scb->command = IM_OTHER_SCSI_CMD_CMD;
 scb->enable |= IM_SUPRESS_EXCEPTION_SHORT;/*Select needs WRITE-enabled*/
 scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
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;
 scb->u1.scsi_cmd_length = cmd->cmd_len;
memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
break;
}

/*issue scb command, and return */
issue_cmd(host_index,virt_to_bus(scb), IM_SCB | ldn);
return0;
}

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

intibmmca_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 host_index;
static unsigned long flags;
unsigned long imm_command;

/* return SCSI_ABORT_SNOOZE ; */

#ifdef OLDKERN 
save_flags(flags);
cli();
#else
spin_lock_irqsave(&abort_lock, flags);
#endif 
if(ibm_ansi_order)
 target =6- cmd->target;
else
 target = cmd->target;

 shpnt = cmd->host;

/* search for the right hostadapter */
for(host_index =0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);

if(!hosts[host_index])
{/* invalid hostadapter descriptor address */
 cmd->result = DID_NO_CONNECT <<16;
if(cmd->scsi_done)
(cmd->done) (cmd);
return SCSI_ABORT_SNOOZE;
}

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

/*if cmd for this ldn has already finished, no need to abort */
if(!ld(host_index)[ldn].cmd)
{
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&abort_lock, flags);
#endif 
return SCSI_ABORT_NOT_RUNNING;
}

/* 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(host_index)[ldn] = IM_ABORT_IMM_CMD;
last_scsi_type(host_index)[ldn] = IM_IMM_CMD;
 imm_command =inl(IM_CMD_REG(host_index));
 imm_command &= (unsigned long)(0xffff0000);/* mask reserved stuff */
 imm_command |= (unsigned long)(IM_ABORT_IMM_CMD);
/* must wait for attention reg not busy */
while(1)
{
if(!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
break;
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&abort_lock, flags);
#endif 
#ifdef OLDKERN 
save_flags(flags);
cli();
#else
spin_lock_irqsave(&abort_lock, flags);
#endif 
}
/*write registers and enable system interrupts */
outl(imm_command,IM_CMD_REG(host_index));
outb(IM_IMM_CMD | ldn,IM_ATTN_REG(host_index));
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&abort_lock, flags);
#endif

#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Abort submitted, waiting for adapter response...\n");
#endif 
while(!cmd->SCp.Status)
barrier();
 cmd->scsi_done = saved_done;
/*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(host_index)[ldn].cmd = NULL;
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Abort finished with success.\n");
#endif 
return SCSI_ABORT_SUCCESS;
}
else
{
 cmd->result |= DID_NO_CONNECT <<16;
if(cmd->scsi_done)
(cmd->scsi_done) (cmd);
ld(host_index)[ldn].cmd = NULL;
#ifdef IM_DEBUG_PROBE
printk("IBM MCA SCSI: Abort failed.\n");
#endif 
return SCSI_ABORT_ERROR;
}
}

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

intibmmca_reset(Scsi_Cmnd * cmd,unsigned int reset_flags)
{
struct Scsi_Host *shpnt;
 Scsi_Cmnd *cmd_aid;
int ticks,i;
int host_index;
static unsigned long flags;
unsigned long imm_command;

#ifdef OLDKERN 
save_flags(flags);
cli();
#else
spin_lock_irqsave(&reset_lock, flags);
#endif 
 ticks = IM_RESET_DELAY*HZ;
 shpnt = cmd->host;
/* search for the right hostadapter */
for(host_index =0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);

if(!hosts[host_index])
{/* invalid hostadapter descriptor address */
if(!local_checking_phase_flag(host_index))
{
 cmd->result = DID_NO_CONNECT <<16;
if(cmd->scsi_done)
(cmd->done) (cmd);
}
return SCSI_ABORT_SNOOZE;
}

if(local_checking_phase_flag(host_index))
{
printk("IBM MCA SCSI: unable to reset while checking devices.\n");
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&reset_lock, flags);
#endif 
return SCSI_RESET_SNOOZE;
}

/* issue reset immediate command to subsystem, and wait for interrupt */
printk("IBM MCA SCSI: resetting all devices.\n");
reset_status(host_index) = IM_RESET_IN_PROGRESS;
last_scsi_command(host_index)[0xf] = IM_RESET_IMM_CMD;
last_scsi_type(host_index)[0xf] = IM_IMM_CMD;
 imm_command =inl(IM_CMD_REG(host_index));
 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(host_index)) & IM_BUSY))
break;
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&reset_lock, flags);
#endif 
#ifdef OLDKERN 
save_flags(flags);
cli();
#else
spin_lock_irqsave(&reset_lock, flags);
#endif 
}
/*write registers and enable system interrupts */
outl(imm_command,IM_CMD_REG(host_index));
outb(IM_IMM_CMD |0xf,IM_ATTN_REG(host_index));
/* wait for interrupt finished or intr_stat register to be set, as the
 * interrupt will not be executed, while we are in here! */
while(reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks
&& ((inb(IM_INTR_REG(host_index)) &0x8f)!=0x8f)) {
mdelay(1+999/HZ);
barrier();
}
/* if reset did not complete, just return an error*/
if(!ticks) {
printk("IBM MCA SCSI: reset did not complete within %d seconds.\n",
 IM_RESET_DELAY);
reset_status(host_index) = IM_RESET_FINISHED_FAIL;
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&reset_lock, flags);
#endif 
return SCSI_RESET_ERROR;
}

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

/* if reset failed, just return an error */
if(reset_status(host_index) == IM_RESET_FINISHED_FAIL) {
printk("IBM MCA SCSI: reset failed.\n");
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&reset_lock, flags);
#endif 
return SCSI_RESET_ERROR;
}

/* so reset finished ok - call outstanding done's, and return success */
printk("IBM MCA SCSI: Reset completed without known error.\n");
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&reset_lock, flags);
#endif 
for(i =0; i < MAX_LOG_DEV; i++)
{
 cmd_aid =ld(host_index)[i].cmd;
if(cmd_aid && cmd_aid->scsi_done)
{
ld(host_index)[i].cmd = NULL;
 cmd_aid->result = DID_RESET <<16;
(cmd_aid->scsi_done) (cmd_aid);
}
}
return SCSI_RESET_SUCCESS;
}

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

intibmmca_biosparam(Disk * disk, kdev_t dev,int*info)
{
 info[0] =64;
 info[1] =32;
 info[2] = disk->capacity / (info[0] * info[1]);
if(info[2] >=1024)
{
 info[0] =128;
 info[1] =63;
 info[2] = disk->capacity / (info[0] * info[1]);
if(info[2] >=1024)
{
 info[0] =255;
 info[1] =63;
 info[2] = disk->capacity / (info[0] * info[1]);
if(info[2] >=1024)
 info[2] =1023;
}
}
return0;
}

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

/* calculate total amount of r/w-accesses */
static intldn_access_total_read_write(int host_index)
{
int a;
int i;

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

static intldn_access_total_inquiry(int host_index)
{
int a;
int i;

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

static intldn_access_total_modeselect(int host_index)
{
int a;
int i;

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

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

#ifdef OLDKERN 
save_flags(flags);
cli();
#else
spin_lock_irqsave(&proc_lock, flags);
#endif 

for(i =0; hosts[i] && hosts[i]->host_no != hostno; i++);
 shpnt = hosts[i];
 host_index = i;
if(!shpnt) {
 len +=sprintf(buffer+len,"\nCan't find adapter for host number %d\n", hostno);
return len;
}

 len +=sprintf(buffer+len,"\nIBM-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",
 hostno);
 len +=sprintf(buffer+len," Base I/O-Port............: 0x%x\n",
(unsigned int)(IM_CMD_REG(host_index)));
 len +=sprintf(buffer+len," (Shared) IRQ.............: %d\n",
 IM_IRQ);
 len +=sprintf(buffer+len," SCSI-command set used....: %s\n",
(bypass_controller) ?"software":"hardware integrated");
 len +=sprintf(buffer+len," Total Interrupts.........: %d\n",
IBM_DS(host_index).total_interrupts);
 len +=sprintf(buffer+len," Total SCSI Accesses......: %d\n",
IBM_DS(host_index).total_accesses);
 len +=sprintf(buffer+len," Total SCSI READ/WRITE..: %d\n",
ldn_access_total_read_write(host_index));
 len +=sprintf(buffer+len," Total SCSI Inquiries...: %d\n",
ldn_access_total_inquiry(host_index));
 len +=sprintf(buffer+len," Total SCSI Modeselects.: %d\n",
ldn_access_total_modeselect(host_index));
 len +=sprintf(buffer+len," Total SCSI other cmds..: %d\n",
IBM_DS(host_index).total_accesses -ldn_access_total_read_write(host_index)
-ldn_access_total_modeselect(host_index)
-ldn_access_total_inquiry(host_index));
 len +=sprintf(buffer+len," Total SCSI command fails.: %d\n\n",
IBM_DS(host_index).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(host_index, i),IBM_DS(host_index).ldn_read_access[i],
IBM_DS(host_index).ldn_write_access[i],IBM_DS(host_index).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(host_index).total_scsi_devices);
 len +=sprintf(buffer+len," Dynamical Assignment necessaray..: %s\n",
IBM_DS(host_index).dyn_flag ?"Yes":"No ");
 len +=sprintf(buffer+len," Next LDN to be assigned..........: 0x%x\n",
next_ldn(host_index));
 len +=sprintf(buffer+len," Dynamical assignments done yet...: %d\n",
IBM_DS(host_index).dynamical_assignments);

 len +=sprintf(buffer+len,"\nCurrent 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<=7; id++)
{
 len +=sprintf(buffer+len," %2d ",id);
for(lun=0; lun<8; lun++)
 len +=sprintf(buffer+len,"%2s ",ti_p(get_scsi(host_index)[id][lun]));
 len +=sprintf(buffer+len," %2d ",id);
for(lun=0; lun<8; lun++)
 len +=sprintf(buffer+len,"%2s ",ti_l(get_ldn(host_index)[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;
#ifdef OLDKERN 
restore_flags(flags);
#else
spin_unlock_irqrestore(&proc_lock, flags);
#endif 
return len;
}

#ifdef MODULE
/* Eventually this will go into an include file, but this will be later */
Scsi_Host_Template driver_template = IBMMCA;

#include"scsi_module.c"
#endif

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