drivers/scsi/ibmmca.c

   1 /*
   2  Low Level Linux Driver for the IBM Microchannel SCSI Subsystem for
   3  Linux Kernel >= 2.4.0.
   4  Copyright (c) 1995 Strom Systems, Inc. under the terms of the GNU
   5  General Public License. Written by Martin Kolinek, December 1995.
   6  Further development by: Chris Beauregard, Klaus Kudielka, Michael Lang
   7  See the file Documentation/scsi/ibmmca.txt for a detailed description
   8  of this driver, the commandline arguments and the history of its
   9  development.
  10  See the WWW-page: http://www.uni-mainz.de/~langm000/linux.html for latest
  11  updates, info and ADF-files for adapters supported by this driver.
  12
  13  Alan Cox <alan@redhat.com>
  14  Updated for Linux 2.5.45 to use the new error handler, cleaned up the
  15  lock macros and did a few unavoidable locking tweaks, plus one locking
  16  fix in the irq and completion path.
  17
  18  */
  19
  20 #include <linux/config.h>
  21 #ifndef LINUX_VERSION_CODE
  22 #include <linux/version.h>
  23 #endif
  24 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,45)
  25 #error "This driver works only with kernel 2.5.45 or higher!"
  26 #endif
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/types.h>
  30 #include <linux/ctype.h>
  31 #include <linux/string.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/ioport.h>
  34 #include <linux/delay.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/stat.h>
  38 #include <linux/mca.h>
  39 #include <linux/string.h>
  40 #include <linux/spinlock.h>
  41 #include <linux/init.h>
  42 #include <linux/mca-legacy.h>
  43
  44 #include <asm/system.h>
  45 #include <asm/io.h>
  46
  47 #include "scsi.h"
  48 #include <scsi/scsi_host.h>
  49 #include "ibmmca.h"
  50
  51 /* current version of this driver-source: */
  52 #define IBMMCA_SCSI_DRIVER_VERSION "4.0b-ac"
  53
  54 /* driver configuration */
  55 #define IM_MAX_HOSTS     8      /* maximum number of host adapters */
  56 #define IM_RESET_DELAY  60      /* seconds allowed for a reset */
  57
  58 /* driver debugging - #undef all for normal operation */
  59 /* if defined: count interrupts and ignore this special one: */
  60 #undef  IM_DEBUG_TIMEOUT        //50
  61 #define TIMEOUT_PUN     0
  62 #define TIMEOUT_LUN     0
  63 /* verbose interrupt: */
  64 #undef IM_DEBUG_INT
  65 /* verbose queuecommand: */
  66 #undef IM_DEBUG_CMD
  67 /* verbose queucommand for specific SCSI-device type: */
  68 #undef IM_DEBUG_CMD_SPEC_DEV
  69 /* verbose device probing */
  70 #undef IM_DEBUG_PROBE
  71
  72 /* device type that shall be displayed on syslog (only during debugging): */
  73 #define IM_DEBUG_CMD_DEVICE     TYPE_TAPE
  74
  75 /* relative addresses of hardware registers on a subsystem */
  76 #define IM_CMD_REG(hi)  (hosts[(hi)]->io_port)  /*Command Interface, (4 bytes long) */
  77 #define IM_ATTN_REG(hi) (hosts[(hi)]->io_port+4)        /*Attention (1 byte) */
  78 #define IM_CTR_REG(hi)  (hosts[(hi)]->io_port+5)        /*Basic Control (1 byte) */
  79 #define IM_INTR_REG(hi) (hosts[(hi)]->io_port+6)        /*Interrupt Status (1 byte, r/o) */
  80 #define IM_STAT_REG(hi) (hosts[(hi)]->io_port+7)        /*Basic Status (1 byte, read only) */
  81
  82 /* basic I/O-port of first adapter */
  83 #define IM_IO_PORT      0x3540
  84 /* maximum number of hosts that can be found */
  85 #define IM_N_IO_PORT    8
  86
  87 /*requests going into the upper nibble of the Attention register */
  88 /*note: the lower nibble specifies the device(0-14), or subsystem(15) */
  89 #define IM_IMM_CMD      0x10    /*immediate command */
  90 #define IM_SCB          0x30    /*Subsystem Control Block command */
  91 #define IM_LONG_SCB     0x40    /*long Subsystem Control Block command */
  92 #define IM_EOI          0xe0    /*end-of-interrupt request */
  93
  94 /*values for bits 7,1,0 of Basic Control reg. (bits 6-2 reserved) */
  95 #define IM_HW_RESET     0x80    /*hardware reset */
  96 #define IM_ENABLE_DMA   0x02    /*enable subsystem's busmaster DMA */
  97 #define IM_ENABLE_INTR  0x01    /*enable interrupts to the system */
  98
  99 /*to interpret the upper nibble of Interrupt Status register */
 100 /*note: the lower nibble specifies the device(0-14), or subsystem(15) */
 101 #define IM_SCB_CMD_COMPLETED                    0x10
 102 #define IM_SCB_CMD_COMPLETED_WITH_RETRIES       0x50
 103 #define IM_LOOP_SCATTER_BUFFER_FULL             0x60
 104 #define IM_ADAPTER_HW_FAILURE                   0x70
 105 #define IM_IMMEDIATE_CMD_COMPLETED              0xa0
 106 #define IM_CMD_COMPLETED_WITH_FAILURE           0xc0
 107 #define IM_CMD_ERROR                            0xe0
 108 #define IM_SOFTWARE_SEQUENCING_ERROR            0xf0
 109
 110 /*to interpret bits 3-0 of Basic Status register (bits 7-4 reserved) */
 111 #define IM_CMD_REG_FULL         0x08
 112 #define IM_CMD_REG_EMPTY        0x04
 113 #define IM_INTR_REQUEST         0x02
 114 #define IM_BUSY                 0x01
 115
 116 /*immediate commands (word written into low 2 bytes of command reg) */
 117 #define IM_RESET_IMM_CMD        0x0400
 118 #define IM_FEATURE_CTR_IMM_CMD  0x040c
 119 #define IM_DMA_PACING_IMM_CMD   0x040d
 120 #define IM_ASSIGN_IMM_CMD       0x040e
 121 #define IM_ABORT_IMM_CMD        0x040f
 122 #define IM_FORMAT_PREP_IMM_CMD  0x0417
 123
 124 /*SCB (Subsystem Control Block) structure */
 125 struct im_scb {
 126         unsigned short command; /*command word (read, etc.) */
 127         unsigned short enable;  /*enable word, modifies cmd */
 128         union {
 129                 unsigned long log_blk_adr;      /*block address on SCSI device */
 130                 unsigned char scsi_cmd_length;  /*6,10,12, for other scsi cmd */
 131         } u1;
 132         unsigned long sys_buf_adr;      /*physical system memory adr */
 133         unsigned long sys_buf_length;   /*size of sys mem buffer */
 134         unsigned long tsb_adr;  /*Termination Status Block adr */
 135         unsigned long scb_chain_adr;    /*optional SCB chain address */
 136         union {
 137                 struct {
 138                         unsigned short count;   /*block count, on SCSI device */
 139                         unsigned short length;  /*block length, on SCSI device */
 140                 } blk;
 141                 unsigned char scsi_command[12]; /*other scsi command */
 142         } u2;
 143 };
 144
 145 /*structure scatter-gather element (for list of system memory areas) */
 146 struct im_sge {
 147         void *address;
 148         unsigned long byte_length;
 149 };
 150
 151 /*structure returned by a get_pos_info command: */
 152 struct im_pos_info {
 153         unsigned short pos_id;  /* adapter id */
 154         unsigned char pos_3a;   /* pos 3 (if pos 6 = 0) */
 155         unsigned char pos_2;    /* pos 2 */
 156         unsigned char int_level;        /* interrupt level IRQ 11 or 14 */
 157         unsigned char pos_4a;   /* pos 4 (if pos 6 = 0) */
 158         unsigned short connector_size;  /* MCA connector size: 16 or 32 Bit */
 159         unsigned char num_luns; /* number of supported luns per device */
 160         unsigned char num_puns; /* number of supported puns */
 161         unsigned char pacing_factor;    /* pacing factor */
 162         unsigned char num_ldns; /* number of ldns available */
 163         unsigned char eoi_off;  /* time EOI and interrupt inactive */
 164         unsigned char max_busy; /* time between reset and busy on */
 165         unsigned short cache_stat;      /* ldn cachestat. Bit=1 = not cached */
 166         unsigned short retry_stat;      /* retry status of ldns. Bit=1=disabled */
 167         unsigned char pos_4b;   /* pos 4 (if pos 6 = 1) */
 168         unsigned char pos_3b;   /* pos 3 (if pos 6 = 1) */
 169         unsigned char pos_6;    /* pos 6 */
 170         unsigned char pos_5;    /* pos 5 */
 171         unsigned short max_overlap;     /* maximum overlapping requests */
 172         unsigned short num_bus; /* number of SCSI-busses */
 173 };
 174
 175 /*values for SCB command word */
 176 #define IM_NO_SYNCHRONOUS      0x0040   /*flag for any command */
 177 #define IM_NO_DISCONNECT       0x0080   /*flag for any command */
 178 #define IM_READ_DATA_CMD       0x1c01
 179 #define IM_WRITE_DATA_CMD      0x1c02
 180 #define IM_READ_VERIFY_CMD     0x1c03
 181 #define IM_WRITE_VERIFY_CMD    0x1c04
 182 #define IM_REQUEST_SENSE_CMD   0x1c08
 183 #define IM_READ_CAPACITY_CMD   0x1c09
 184 #define IM_DEVICE_INQUIRY_CMD  0x1c0b
 185 #define IM_READ_LOGICAL_CMD    0x1c2a
 186 #define IM_OTHER_SCSI_CMD_CMD  0x241f
 187
 188 /* unused, but supported, SCB commands */
 189 #define IM_GET_COMMAND_COMPLETE_STATUS_CMD   0x1c07     /* command status */
 190 #define IM_GET_POS_INFO_CMD                  0x1c0a     /* returns neat stuff */
 191 #define IM_READ_PREFETCH_CMD                 0x1c31     /* caching controller only */
 192 #define IM_FOMAT_UNIT_CMD                    0x1c16     /* format unit */
 193 #define IM_REASSIGN_BLOCK_CMD                0x1c18     /* in case of error */
 194
 195 /*values to set bits in the enable word of SCB */
 196 #define IM_READ_CONTROL              0x8000
 197 #define IM_REPORT_TSB_ONLY_ON_ERROR  0x4000
 198 #define IM_RETRY_ENABLE              0x2000
 199 #define IM_POINTER_TO_LIST           0x1000
 200 #define IM_SUPRESS_EXCEPTION_SHORT   0x0400
 201 #define IM_BYPASS_BUFFER             0x0200
 202 #define IM_CHAIN_ON_NO_ERROR         0x0001
 203
 204 /*TSB (Termination Status Block) structure */
 205 struct im_tsb {
 206         unsigned short end_status;
 207         unsigned short reserved1;
 208         unsigned long residual_byte_count;
 209         unsigned long sg_list_element_adr;
 210         unsigned short status_length;
 211         unsigned char dev_status;
 212         unsigned char cmd_status;
 213         unsigned char dev_error;
 214         unsigned char cmd_error;
 215         unsigned short reserved2;
 216         unsigned short reserved3;
 217         unsigned short low_of_last_scb_adr;
 218         unsigned short high_of_last_scb_adr;
 219 };
 220
 221 /*subsystem uses interrupt request level 14 */
 222 #define IM_IRQ     14
 223 /*SCSI-2 F/W may evade to interrupt 11 */
 224 #define IM_IRQ_FW  11
 225
 226 /* Model 95 has an additional alphanumeric display, which can be used
 227    to display SCSI-activities. 8595 models do not have any disk led, which
 228    makes this feature quite useful.
 229    The regular PS/2 disk led is turned on/off by bits 6,7 of system
 230    control port. */
 231
 232 /* LED display-port (actually, last LED on display) */
 233 #define MOD95_LED_PORT     0x108
 234 /* system-control-register of PS/2s with diskindicator */
 235 #define PS2_SYS_CTR        0x92
 236 /* activity displaying methods */
 237 #define LED_DISP           1
 238 #define LED_ADISP          2
 239 #define LED_ACTIVITY       4
 240 /* failed intr */
 241 #define CMD_FAIL           255
 242
 243 /* The SCSI-ID(!) of the accessed SCSI-device is shown on PS/2-95 machines' LED
 244    displays. ldn is no longer displayed here, because the ldn mapping is now
 245    done dynamically and the ldn <-> pun,lun maps can be looked-up at boottime
 246    or during uptime in /proc/scsi/ibmmca/<host_no> in case of trouble,
 247    interest, debugging or just for having fun. The left number gives the
 248    host-adapter number and the right shows the accessed SCSI-ID. */
 249
 250 /* display_mode is set by the ibmmcascsi= command line arg */
 251 static int display_mode = 0;
 252 /* set default adapter timeout */
 253 static unsigned int adapter_timeout = 45;
 254 /* for probing on feature-command: */
 255 static unsigned int global_command_error_excuse = 0;
 256 /* global setting by command line for adapter_speed */
 257 static int global_adapter_speed = 0;    /* full speed by default */
 258
 259 /* Panel / LED on, do it right for F/W addressin, too. adisplay will
 260  * just ignore ids>7, as the panel has only 7 digits available */
 261 #define PS2_DISK_LED_ON(ad,id) { if (display_mode & LED_DISP) { if (id>9) \
 262     outw((ad+48)|((id+55)<<8), MOD95_LED_PORT ); else \
 263     outw((ad+48)|((id+48)<<8), MOD95_LED_PORT ); } else \
 264     if (display_mode & LED_ADISP) { if (id<7) outb((char)(id+48),MOD95_LED_PORT+1+id); \
 265     outb((char)(ad+48), MOD95_LED_PORT); } \
 266     if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
 267     outb(inb(PS2_SYS_CTR) | 0xc0, PS2_SYS_CTR); }
 268
 269 /* Panel / LED off */
 270 /* bug fixed, Dec 15, 1997, where | was replaced by & here */
 271 #define PS2_DISK_LED_OFF() { if (display_mode & LED_DISP) \
 272     outw(0x2020, MOD95_LED_PORT ); else if (display_mode & LED_ADISP) { \
 273     outl(0x20202020,MOD95_LED_PORT); outl(0x20202020,MOD95_LED_PORT+4); } \
 274     if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
 275     outb(inb(PS2_SYS_CTR) & 0x3f, PS2_SYS_CTR); }
 276
 277 /*list of supported subsystems */
 278 struct subsys_list_struct {
 279         unsigned short mca_id;
 280         char *description;
 281 };
 282
 283 /* types of different supported hardware that goes to hostdata special */
 284 #define IBM_SCSI2_FW     0
 285 #define IBM_7568_WCACHE  1
 286 #define IBM_EXP_UNIT     2
 287 #define IBM_SCSI_WCACHE  3
 288 #define IBM_SCSI         4
 289
 290 /* other special flags for hostdata structure */
 291 #define FORCED_DETECTION         100
 292 #define INTEGRATED_SCSI          101
 293
 294 /* List of possible IBM-SCSI-adapters */
 295 static struct subsys_list_struct subsys_list[] = {
 296         {0x8efc, "IBM SCSI-2 F/W Adapter"},     /* special = 0 */
 297         {0x8efd, "IBM 7568 Industrial Computer SCSI Adapter w/Cache"},  /* special = 1 */
 298         {0x8ef8, "IBM Expansion Unit SCSI Controller"}, /* special = 2 */
 299         {0x8eff, "IBM SCSI Adapter w/Cache"},   /* special = 3 */
 300         {0x8efe, "IBM SCSI Adapter"},   /* special = 4 */
 301 };
 302
 303 /* Max number of logical devices (can be up from 0 to 14).  15 is the address
 304 of the adapter itself. */
 305 #define MAX_LOG_DEV  15
 306
 307 /*local data for a logical device */
 308 struct logical_device {
 309         struct im_scb scb;      /* SCSI-subsystem-control-block structure */
 310         struct im_tsb tsb;      /* SCSI command complete status block structure */
 311         struct im_sge sge[16];  /* scatter gather list structure */
 312         unsigned char buf[256]; /* SCSI command return data buffer */
 313         Scsi_Cmnd *cmd;         /* SCSI-command that is currently in progress */
 314         int device_type;        /* type of the SCSI-device. See include/scsi/scsi.h
 315                                    for interpretation of the possible values */
 316         int block_length;       /* blocksize of a particular logical SCSI-device */
 317         int cache_flag;         /* 1 if this is uncached, 0 if cache is present for ldn */
 318         int retry_flag;         /* 1 if adapter retry is disabled, 0 if enabled */
 319 };
 320
 321 /* statistics of the driver during operations (for proc_info) */
 322 struct Driver_Statistics {
 323         /* SCSI statistics on the adapter */
 324         int ldn_access[MAX_LOG_DEV + 1];        /* total accesses on a ldn */
 325         int ldn_read_access[MAX_LOG_DEV + 1];   /* total read-access on a ldn */
 326         int ldn_write_access[MAX_LOG_DEV + 1];  /* total write-access on a ldn */
 327         int ldn_inquiry_access[MAX_LOG_DEV + 1];        /* total inquiries on a ldn */
 328         int ldn_modeselect_access[MAX_LOG_DEV + 1];     /* total mode selects on ldn */
 329         int scbs;               /* short SCBs queued */
 330         int long_scbs;          /* long SCBs queued */
 331         int total_accesses;     /* total accesses on all ldns */
 332         int total_interrupts;   /* total interrupts (should be
 333                                    same as total_accesses) */
 334         int total_errors;       /* command completed with error */
 335         /* dynamical assignment statistics */
 336         int total_scsi_devices; /* number of physical pun,lun */
 337         int dyn_flag;           /* flag showing dynamical mode */
 338         int dynamical_assignments;      /* number of remappings of ldns */
 339         int ldn_assignments[MAX_LOG_DEV + 1];   /* number of remappings of each
 340                                                    ldn */
 341 };
 342
 343 /* data structure for each host adapter */
 344 struct ibmmca_hostdata {
 345         /* array of logical devices: */
 346         struct logical_device _ld[MAX_LOG_DEV + 1];
 347         /* array to convert (pun, lun) into logical device number: */
 348         unsigned char _get_ldn[16][8];
 349         /*array that contains the information about the physical SCSI-devices
 350            attached to this host adapter: */
 351         unsigned char _get_scsi[16][8];
 352         /* used only when checking logical devices: */
 353         int _local_checking_phase_flag;
 354         /* report received interrupt: */
 355         int _got_interrupt;
 356         /* report termination-status of SCSI-command: */
 357         int _stat_result;
 358         /* reset status (used only when doing reset): */
 359         int _reset_status;
 360         /* code of the last SCSI command (needed for panic info): */
 361         int _last_scsi_command[MAX_LOG_DEV + 1];
 362         /* identifier of the last SCSI-command type */
 363         int _last_scsi_type[MAX_LOG_DEV + 1];
 364         /* last blockcount */
 365         int _last_scsi_blockcount[MAX_LOG_DEV + 1];
 366         /* last locgical block address */
 367         unsigned long _last_scsi_logical_block[MAX_LOG_DEV + 1];
 368         /* Counter that points on the next reassignable ldn for dynamical
 369            remapping. The default value is 7, that is the first reassignable
 370            number in the list at boottime: */
 371         int _next_ldn;
 372         /* Statistics-structure for this IBM-SCSI-host: */
 373         struct Driver_Statistics _IBM_DS;
 374         /* This hostadapters pos-registers pos2 until pos6 */
 375         unsigned int _pos[8];
 376         /* assign a special variable, that contains dedicated info about the
 377            adaptertype */
 378         int _special;
 379         /* connector size on the MCA bus */
 380         int _connector_size;
 381         /* synchronous SCSI transfer rate bitpattern */
 382         int _adapter_speed;
 383 };
 384
 385 /* macros to access host data structure */
 386 #define subsystem_pun(hi) (hosts[(hi)]->this_id)
 387 #define subsystem_maxid(hi) (hosts[(hi)]->max_id)
 388 #define ld(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_ld)
 389 #define get_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_ldn)
 390 #define get_scsi(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_scsi)
 391 #define local_checking_phase_flag(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_local_checking_phase_flag)
 392 #define got_interrupt(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_got_interrupt)
 393 #define stat_result(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_stat_result)
 394 #define reset_status(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_reset_status)
 395 #define last_scsi_command(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_command)
 396 #define last_scsi_type(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_type)
 397 #define last_scsi_blockcount(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_blockcount)
 398 #define last_scsi_logical_block(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_logical_block)
 399 #define last_scsi_type(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_type)
 400 #define next_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_next_ldn)
 401 #define IBM_DS(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_IBM_DS)
 402 #define special(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_special)
 403 #define subsystem_connector_size(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_connector_size)
 404 #define adapter_speed(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_adapter_speed)
 405 #define pos2(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[2])
 406 #define pos3(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[3])
 407 #define pos4(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[4])
 408 #define pos5(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[5])
 409 #define pos6(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[6])
 410
 411 /* Define a arbitrary number as subsystem-marker-type. This number is, as
 412    described in the ANSI-SCSI-standard, not occupied by other device-types. */
 413 #define TYPE_IBM_SCSI_ADAPTER   0x2F
 414
 415 /* Define 0xFF for no device type, because this type is not defined within
 416    the ANSI-SCSI-standard, therefore, it can be used and should not cause any
 417    harm. */
 418 #define TYPE_NO_DEVICE          0xFF
 419
 420 /* define medium-changer. If this is not defined previously, e.g. Linux
 421    2.0.x, define this type here. */
 422 #ifndef TYPE_MEDIUM_CHANGER
 423 #define TYPE_MEDIUM_CHANGER     0x08
 424 #endif
 425
 426 /* define possible operations for the immediate_assign command */
 427 #define SET_LDN        0
 428 #define REMOVE_LDN     1
 429
 430 /* ldn which is used to probe the SCSI devices */
 431 #define PROBE_LDN      0
 432
 433 /* reset status flag contents */
 434 #define IM_RESET_NOT_IN_PROGRESS         0
 435 #define IM_RESET_IN_PROGRESS             1
 436 #define IM_RESET_FINISHED_OK             2
 437 #define IM_RESET_FINISHED_FAIL           3
 438 #define IM_RESET_NOT_IN_PROGRESS_NO_INT  4
 439 #define IM_RESET_FINISHED_OK_NO_INT      5
 440
 441 /* define undefined SCSI-command */
 442 #define NO_SCSI                  0xffff
 443
 444 /*-----------------------------------------------------------------------*/
 445
 446 /* if this is nonzero, ibmmcascsi option has been passed to the kernel */
 447 static int io_port[IM_MAX_HOSTS] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 448 static int scsi_id[IM_MAX_HOSTS] = { 7, 7, 7, 7, 7, 7, 7, 7 };
 449
 450 /* fill module-parameters only, when this define is present.
 451    (that is kernel version 2.1.x) */
 452 #if defined(MODULE)
 453 static char *boot_options = NULL;
 454 module_param(boot_options, charp, 0);
 455 module_param_array(io_port, int, NULL, 0);
 456 module_param_array(scsi_id, int, NULL, 0);
 457
 458 #if 0 /* FIXME: No longer exist? --RR */
 459 MODULE_PARM(display, "1i");
 460 MODULE_PARM(adisplay, "1i");
 461 MODULE_PARM(normal, "1i");
 462 MODULE_PARM(ansi, "1i");
 463 #endif
 464 #endif
 465 /*counter of concurrent disk read/writes, to turn on/off disk led */
 466 static int disk_rw_in_progress = 0;
 467
 468 /* host information */
 469 static int found = 0;
 470 static struct Scsi_Host *hosts[IM_MAX_HOSTS + 1] = {
 471         NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
 472 };
 473 static unsigned int pos[8];     /* whole pos register-line for diagnosis */
 474 /* Taking into account the additions, made by ZP Gu.
 475  * This selects now the preset value from the configfile and
 476  * offers the 'normal' commandline option to be accepted */
 477 #ifdef CONFIG_IBMMCA_SCSI_ORDER_STANDARD
 478 static char ibm_ansi_order = 1;
 479 #else
 480 static char ibm_ansi_order = 0;
 481 #endif
 482
 483 static void issue_cmd(int, unsigned long, unsigned char);
 484 static void internal_done(Scsi_Cmnd * cmd);
 485 static void check_devices(int, int);
 486 static int immediate_assign(int, unsigned int, unsigned int, unsigned int, unsigned int);
 487 static int immediate_feature(int, unsigned int, unsigned int);
 488 #ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
 489 static int immediate_reset(int, unsigned int);
 490 #endif
 491 static int device_inquiry(int, int);
 492 static int read_capacity(int, int);
 493 static int get_pos_info(int);
 494 static char *ti_p(int);
 495 static char *ti_l(int);
 496 static char *ibmrate(unsigned int, int);
 497 static int probe_display(int);
 498 static int probe_bus_mode(int);
 499 static int device_exists(int, int, int *, int *);
 500 static struct Scsi_Host *ibmmca_register(Scsi_Host_Template *, int, int, int, char *);
 501 static int option_setup(char *);
 502 /* local functions needed for proc_info */
 503 static int ldn_access_load(int, int);
 504 static int ldn_access_total_read_write(int);
 505
 506 static irqreturn_t interrupt_handler(int irq, void *dev_id,
 507                                         struct pt_regs *regs)
 508 {
 509         int host_index, ihost_index;
 510         unsigned int intr_reg;
 511         unsigned int cmd_result;
 512         unsigned int ldn;
 513         Scsi_Cmnd *cmd;
 514         int lastSCSI;
 515         struct Scsi_Host *dev = dev_id;
 516
 517         spin_lock(dev->host_lock);
 518             /* search for one adapter-response on shared interrupt */
 519             for (host_index = 0; hosts[host_index] && !(inb(IM_STAT_REG(host_index)) & IM_INTR_REQUEST); host_index++);
 520         /* return if some other device on this IRQ caused the interrupt */
 521         if (!hosts[host_index]) {
 522                 spin_unlock(dev->host_lock);
 523                 return IRQ_NONE;
 524         }
 525
 526         /* the reset-function already did all the job, even ints got
 527            renabled on the subsystem, so just return */
 528         if ((reset_status(host_index) == IM_RESET_NOT_IN_PROGRESS_NO_INT) || (reset_status(host_index) == IM_RESET_FINISHED_OK_NO_INT)) {
 529                 reset_status(host_index) = IM_RESET_NOT_IN_PROGRESS;
 530                 spin_unlock(dev->host_lock);
 531                 return IRQ_HANDLED;
 532         }
 533
 534         /*must wait for attention reg not busy, then send EOI to subsystem */
 535         while (1) {
 536                 if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
 537                         break;
 538                 cpu_relax();
 539         }
 540         ihost_index = host_index;
 541         /*get command result and logical device */
 542         intr_reg = (unsigned char) (inb(IM_INTR_REG(ihost_index)));
 543         cmd_result = intr_reg & 0xf0;
 544         ldn = intr_reg & 0x0f;
 545         /* get the last_scsi_command here */
 546         lastSCSI = last_scsi_command(ihost_index)[ldn];
 547         outb(IM_EOI | ldn, IM_ATTN_REG(ihost_index));
 548
 549         /*these should never happen (hw fails, or a local programming bug) */
 550         if (!global_command_error_excuse) {
 551                 switch (cmd_result) {
 552                         /* Prevent from Ooopsing on error to show the real reason */
 553                 case IM_ADAPTER_HW_FAILURE:
 554                 case IM_SOFTWARE_SEQUENCING_ERROR:
 555                 case IM_CMD_ERROR:
 556                         printk(KERN_ERR "IBM MCA SCSI: Fatal Subsystem ERROR!\n");
 557                         printk(KERN_ERR "              Last cmd=0x%x, ena=%x, len=", lastSCSI, ld(ihost_index)[ldn].scb.enable);
 558                         if (ld(ihost_index)[ldn].cmd)
 559                                 printk("%ld/%ld,", (long) (ld(ihost_index)[ldn].cmd->request_bufflen), (long) (ld(ihost_index)[ldn].scb.sys_buf_length));
 560                         else
 561                                 printk("none,");
 562                         if (ld(ihost_index)[ldn].cmd)
 563                                 printk("Blocksize=%d", ld(ihost_index)[ldn].scb.u2.blk.length);
 564                         else
 565                                 printk("Blocksize=none");
 566                         printk(", host=0x%x, ldn=0x%x\n", ihost_index, ldn);
 567                         if (ld(ihost_index)[ldn].cmd) {
 568                                 printk(KERN_ERR "Blockcount=%d/%d\n", last_scsi_blockcount(ihost_index)[ldn], ld(ihost_index)[ldn].scb.u2.blk.count);
 569                                 printk(KERN_ERR "Logical block=%lx/%lx\n", last_scsi_logical_block(ihost_index)[ldn], ld(ihost_index)[ldn].scb.u1.log_blk_adr);
 570                         }
 571                         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");
 572                         /* if errors appear, enter this section to give detailed info */
 573                         printk(KERN_ERR "IBM MCA SCSI: Subsystem Error-Status follows:\n");
 574                         printk(KERN_ERR "              Command Type................: %x\n", last_scsi_type(ihost_index)[ldn]);
 575                         printk(KERN_ERR "              Attention Register..........: %x\n", inb(IM_ATTN_REG(ihost_index)));
 576                         printk(KERN_ERR "              Basic Control Register......: %x\n", inb(IM_CTR_REG(ihost_index)));
 577                         printk(KERN_ERR "              Interrupt Status Register...: %x\n", intr_reg);
 578                         printk(KERN_ERR "              Basic Status Register.......: %x\n", inb(IM_STAT_REG(ihost_index)));
 579                         if ((last_scsi_type(ihost_index)[ldn] == IM_SCB) || (last_scsi_type(ihost_index)[ldn] == IM_LONG_SCB)) {
 580                                 printk(KERN_ERR "              SCB-Command.................: %x\n", ld(ihost_index)[ldn].scb.command);
 581                                 printk(KERN_ERR "              SCB-Enable..................: %x\n", ld(ihost_index)[ldn].scb.enable);
 582                                 printk(KERN_ERR "              SCB-logical block address...: %lx\n", ld(ihost_index)[ldn].scb.u1.log_blk_adr);
 583                                 printk(KERN_ERR "              SCB-system buffer address...: %lx\n", ld(ihost_index)[ldn].scb.sys_buf_adr);
 584                                 printk(KERN_ERR "              SCB-system buffer length....: %lx\n", ld(ihost_index)[ldn].scb.sys_buf_length);
 585                                 printk(KERN_ERR "              SCB-tsb address.............: %lx\n", ld(ihost_index)[ldn].scb.tsb_adr);
 586                                 printk(KERN_ERR "              SCB-Chain address...........: %lx\n", ld(ihost_index)[ldn].scb.scb_chain_adr);
 587                                 printk(KERN_ERR "              SCB-block count.............: %x\n", ld(ihost_index)[ldn].scb.u2.blk.count);
 588                                 printk(KERN_ERR "              SCB-block length............: %x\n", ld(ihost_index)[ldn].scb.u2.blk.length);
 589                         }
 590                         printk(KERN_ERR "              Send this report to the maintainer.\n");
 591                         panic("IBM MCA SCSI: Fatal error message from the subsystem (0x%X,0x%X)!\n", lastSCSI, cmd_result);
 592                         break;
 593                 }
 594         } else {
 595                 /* The command error handling is made silent, but we tell the
 596                  * calling function, that there is a reported error from the
 597                  * adapter. */
 598                 switch (cmd_result) {
 599                 case IM_ADAPTER_HW_FAILURE:
 600                 case IM_SOFTWARE_SEQUENCING_ERROR:
 601                 case IM_CMD_ERROR:
 602                         global_command_error_excuse = CMD_FAIL;
 603                         break;
 604                 default:
 605                         global_command_error_excuse = 0;
 606                         break;
 607                 }
 608         }
 609         /* if no panic appeared, increase the interrupt-counter */
 610         IBM_DS(ihost_index).total_interrupts++;
 611         /*only for local checking phase */
 612         if (local_checking_phase_flag(ihost_index)) {
 613                 stat_result(ihost_index) = cmd_result;
 614                 got_interrupt(ihost_index) = 1;
 615                 reset_status(ihost_index) = IM_RESET_FINISHED_OK;
 616                 last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 617                 spin_unlock(dev->host_lock);
 618                 return IRQ_HANDLED;
 619         }
 620         /* handling of commands coming from upper level of scsi driver */
 621         if (last_scsi_type(ihost_index)[ldn] == IM_IMM_CMD) {
 622                 /* verify ldn, and may handle rare reset immediate command */
 623                 if ((reset_status(ihost_index) == IM_RESET_IN_PROGRESS) && (last_scsi_command(ihost_index)[ldn] == IM_RESET_IMM_CMD)) {
 624                         if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
 625                                 disk_rw_in_progress = 0;
 626                                 PS2_DISK_LED_OFF();
 627                                 reset_status(ihost_index) = IM_RESET_FINISHED_FAIL;
 628                         } else {
 629                                 /*reset disk led counter, turn off disk led */
 630                                 disk_rw_in_progress = 0;
 631                                 PS2_DISK_LED_OFF();
 632                                 reset_status(ihost_index) = IM_RESET_FINISHED_OK;
 633                         }
 634                         stat_result(ihost_index) = cmd_result;
 635                         last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 636                         last_scsi_type(ihost_index)[ldn] = 0;
 637                         spin_unlock(dev->host_lock);
 638                         return IRQ_HANDLED;
 639                 } else if (last_scsi_command(ihost_index)[ldn] == IM_ABORT_IMM_CMD) {
 640                         /* react on SCSI abort command */
 641 #ifdef IM_DEBUG_PROBE
 642                         printk("IBM MCA SCSI: Interrupt from SCSI-abort.\n");
 643 #endif
 644                         disk_rw_in_progress = 0;
 645                         PS2_DISK_LED_OFF();
 646                         cmd = ld(ihost_index)[ldn].cmd;
 647                         ld(ihost_index)[ldn].cmd = NULL;
 648                         if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE)
 649                                 cmd->result = DID_NO_CONNECT << 16;
 650                         else
 651                                 cmd->result = DID_ABORT << 16;
 652                         stat_result(ihost_index) = cmd_result;
 653                         last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 654                         last_scsi_type(ihost_index)[ldn] = 0;
 655                         if (cmd->scsi_done)
 656                                 (cmd->scsi_done) (cmd); /* should be the internal_done */
 657                         spin_unlock(dev->host_lock);
 658                         return IRQ_HANDLED;
 659                 } else {
 660                         disk_rw_in_progress = 0;
 661                         PS2_DISK_LED_OFF();
 662                         reset_status(ihost_index) = IM_RESET_FINISHED_OK;
 663                         stat_result(ihost_index) = cmd_result;
 664                         last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 665                         spin_unlock(dev->host_lock);
 666                         return IRQ_HANDLED;
 667                 }
 668         }
 669         last_scsi_command(ihost_index)[ldn] = NO_SCSI;
 670         last_scsi_type(ihost_index)[ldn] = 0;
 671         cmd = ld(ihost_index)[ldn].cmd;
 672         ld(ihost_index)[ldn].cmd = NULL;
 673 #ifdef IM_DEBUG_TIMEOUT
 674         if (cmd) {
 675                 if ((cmd->target == TIMEOUT_PUN) && (cmd->device->lun == TIMEOUT_LUN)) {
 676                         printk("IBM MCA SCSI: Ignoring interrupt from pun=%x, lun=%x.\n", cmd->target, cmd->device->lun);
 677                         return IRQ_HANDLED;
 678                 }
 679         }
 680 #endif
 681         /*if no command structure, just return, else clear cmd */
 682         if (!cmd)
 683         {
 684                 spin_unlock(dev->host_lock);
 685                 return IRQ_HANDLED;
 686         }
 687
 688 #ifdef IM_DEBUG_INT
 689         printk("cmd=%02x ireg=%02x ds=%02x cs=%02x de=%02x ce=%02x\n", cmd->cmnd[0], intr_reg, ld(ihost_index)[ldn].tsb.dev_status, ld(ihost_index)[ldn].tsb.cmd_status, ld(ihost_index)[ldn].tsb.dev_error, ld(ihost_index)[ldn].tsb.cmd_error);
 690 #endif
 691         /*if this is end of media read/write, may turn off PS/2 disk led */
 692         if ((ld(ihost_index)[ldn].device_type != TYPE_NO_LUN) && (ld(ihost_index)[ldn].device_type != TYPE_NO_DEVICE)) {
 693                 /* only access this, if there was a valid device addressed */
 694                 if (--disk_rw_in_progress == 0)
 695                         PS2_DISK_LED_OFF();
 696         }
 697
 698         /* IBM describes the status-mask to be 0x1e, but this is not conform
 699          * with SCSI-definition, I suppose, the reason for it is that IBM
 700          * adapters do not support CMD_TERMINATED, TASK_SET_FULL and
 701          * ACA_ACTIVE as returning statusbyte information. (ML) */
 702         if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
 703                 cmd->result = (unsigned char) (ld(ihost_index)[ldn].tsb.dev_status & 0x1e);
 704                 IBM_DS(ihost_index).total_errors++;
 705         } else
 706                 cmd->result = 0;
 707         /* write device status into cmd->result, and call done function */
 708         if (lastSCSI == NO_SCSI) {      /* unexpected interrupt :-( */
 709                 cmd->result |= DID_BAD_INTR << 16;
 710                 printk("IBM MCA SCSI: WARNING - Interrupt from non-pending SCSI-command!\n");
 711         } else                  /* things went right :-) */
 712                 cmd->result |= DID_OK << 16;
 713         if (cmd->scsi_done)
 714                 (cmd->scsi_done) (cmd);
 715         spin_unlock(dev->host_lock);
 716         return IRQ_HANDLED;
 717 }
 718
 719 static void issue_cmd(int host_index, unsigned long cmd_reg, unsigned char attn_reg)
 720 {
 721         unsigned long flags;
 722         /* must wait for attention reg not busy */
 723         while (1) {
 724                 spin_lock_irqsave(hosts[host_index]->host_lock, flags);
 725                 if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
 726                         break;
 727                 spin_unlock_irqrestore(hosts[host_index]->host_lock, flags);
 728         }
 729         /* write registers and enable system interrupts */
 730         outl(cmd_reg, IM_CMD_REG(host_index));
 731         outb(attn_reg, IM_ATTN_REG(host_index));
 732         spin_unlock_irqrestore(hosts[host_index]->host_lock, flags);
 733 }
 734
 735 static void internal_done(Scsi_Cmnd * cmd)
 736 {
 737         cmd->SCp.Status++;
 738         return;
 739 }
 740
 741 /* SCSI-SCB-command for device_inquiry */
 742 static int device_inquiry(int host_index, int ldn)
 743 {
 744         int retr;
 745         struct im_scb *scb;
 746         struct im_tsb *tsb;
 747         unsigned char *buf;
 748
 749         scb = &(ld(host_index)[ldn].scb);
 750         tsb = &(ld(host_index)[ldn].tsb);
 751         buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
 752         ld(host_index)[ldn].tsb.dev_status = 0; /* prepare statusblock */
 753         for (retr = 0; retr < 3; retr++) {
 754                 /* fill scb with inquiry command */
 755                 scb->command = IM_DEVICE_INQUIRY_CMD | IM_NO_DISCONNECT;
 756                 scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
 757                 last_scsi_command(host_index)[ldn] = IM_DEVICE_INQUIRY_CMD;
 758                 last_scsi_type(host_index)[ldn] = IM_SCB;
 759                 scb->sys_buf_adr = isa_virt_to_bus(buf);
 760                 scb->sys_buf_length = 255;      /* maximum bufferlength gives max info */
 761                 scb->tsb_adr = isa_virt_to_bus(tsb);
 762                 /* issue scb to passed ldn, and busy wait for interrupt */
 763                 got_interrupt(host_index) = 0;
 764                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
 765                 while (!got_interrupt(host_index))
 766                         barrier();
 767
 768                 /*if command succesful, break */
 769                 if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
 770                         return 1;
 771         }
 772         /*if all three retries failed, return "no device at this ldn" */
 773         if (retr >= 3)
 774                 return 0;
 775         else
 776                 return 1;
 777 }
 778
 779 static int read_capacity(int host_index, int ldn)
 780 {
 781         int retr;
 782         struct im_scb *scb;
 783         struct im_tsb *tsb;
 784         unsigned char *buf;
 785
 786         scb = &(ld(host_index)[ldn].scb);
 787         tsb = &(ld(host_index)[ldn].tsb);
 788         buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
 789         ld(host_index)[ldn].tsb.dev_status = 0;
 790         for (retr = 0; retr < 3; retr++) {
 791                 /*fill scb with read capacity command */
 792                 scb->command = IM_READ_CAPACITY_CMD;
 793                 scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
 794                 last_scsi_command(host_index)[ldn] = IM_READ_CAPACITY_CMD;
 795                 last_scsi_type(host_index)[ldn] = IM_SCB;
 796                 scb->sys_buf_adr = isa_virt_to_bus(buf);
 797                 scb->sys_buf_length = 8;
 798                 scb->tsb_adr = isa_virt_to_bus(tsb);
 799                 /*issue scb to passed ldn, and busy wait for interrupt */
 800                 got_interrupt(host_index) = 0;
 801                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
 802                 while (!got_interrupt(host_index))
 803                         barrier();
 804
 805                 /*if got capacity, get block length and return one device found */
 806                 if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
 807                         return 1;
 808         }
 809         /*if all three retries failed, return "no device at this ldn" */
 810         if (retr >= 3)
 811                 return 0;
 812         else
 813                 return 1;
 814 }
 815
 816 static int get_pos_info(int host_index)
 817 {
 818         int retr;
 819         struct im_scb *scb;
 820         struct im_tsb *tsb;
 821         unsigned char *buf;
 822
 823         scb = &(ld(host_index)[MAX_LOG_DEV].scb);
 824         tsb = &(ld(host_index)[MAX_LOG_DEV].tsb);
 825         buf = (unsigned char *) (&(ld(host_index)[MAX_LOG_DEV].buf));
 826         ld(host_index)[MAX_LOG_DEV].tsb.dev_status = 0;
 827         for (retr = 0; retr < 3; retr++) {
 828                 /*fill scb with get_pos_info command */
 829                 scb->command = IM_GET_POS_INFO_CMD;
 830                 scb->enable = IM_READ_CONTROL | IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
 831                 last_scsi_command(host_index)[MAX_LOG_DEV] = IM_GET_POS_INFO_CMD;
 832                 last_scsi_type(host_index)[MAX_LOG_DEV] = IM_SCB;
 833                 scb->sys_buf_adr = isa_virt_to_bus(buf);
 834                 if (special(host_index) == IBM_SCSI2_FW)
 835                         scb->sys_buf_length = 256;      /* get all info from F/W adapter */
 836                 else
 837                         scb->sys_buf_length = 18;       /* get exactly 18 bytes for other SCSI */
 838                 scb->tsb_adr = isa_virt_to_bus(tsb);
 839                 /*issue scb to ldn=15, and busy wait for interrupt */
 840                 got_interrupt(host_index) = 0;
 841                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | MAX_LOG_DEV);
 842
 843                 /* FIXME: timeout */
 844                 while (!got_interrupt(host_index))
 845                         barrier();
 846
 847                 /*if got POS-stuff, get block length and return one device found */
 848                 if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
 849                         return 1;
 850         }
 851         /* if all three retries failed, return "no device at this ldn" */
 852         if (retr >= 3)
 853                 return 0;
 854         else
 855                 return 1;
 856 }
 857
 858 /* SCSI-immediate-command for assign. This functions maps/unmaps specific
 859  ldn-numbers on SCSI (PUN,LUN). It is needed for presetting of the
 860  subsystem and for dynamical remapping od ldns. */
 861 static int immediate_assign(int host_index, unsigned int pun, unsigned int lun, unsigned int ldn, unsigned int operation)
 862 {
 863         int retr;
 864         unsigned long imm_cmd;
 865
 866         for (retr = 0; retr < 3; retr++) {
 867                 /* select mutation level of the SCSI-adapter */
 868                 switch (special(host_index)) {
 869                 case IBM_SCSI2_FW:
 870                         imm_cmd = (unsigned long) (IM_ASSIGN_IMM_CMD);
 871                         imm_cmd |= (unsigned long) ((lun & 7) << 24);
 872                         imm_cmd |= (unsigned long) ((operation & 1) << 23);
 873                         imm_cmd |= (unsigned long) ((pun & 7) << 20) | ((pun & 8) << 24);
 874                         imm_cmd |= (unsigned long) ((ldn & 15) << 16);
 875                         break;
 876                 default:
 877                         imm_cmd = inl(IM_CMD_REG(host_index));
 878                         imm_cmd &= (unsigned long) (0xF8000000);        /* keep reserved bits */
 879                         imm_cmd |= (unsigned long) (IM_ASSIGN_IMM_CMD);
 880                         imm_cmd |= (unsigned long) ((lun & 7) << 24);
 881                         imm_cmd |= (unsigned long) ((operation & 1) << 23);
 882                         imm_cmd |= (unsigned long) ((pun & 7) << 20);
 883                         imm_cmd |= (unsigned long) ((ldn & 15) << 16);
 884                         break;
 885                 }
 886                 last_scsi_command(host_index)[MAX_LOG_DEV] = IM_ASSIGN_IMM_CMD;
 887                 last_scsi_type(host_index)[MAX_LOG_DEV] = IM_IMM_CMD;
 888                 got_interrupt(host_index) = 0;
 889                 issue_cmd(host_index, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
 890                 while (!got_interrupt(host_index))
 891                         barrier();
 892
 893                 /*if command succesful, break */
 894                 if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
 895                         return 1;
 896         }
 897         if (retr >= 3)
 898                 return 0;
 899         else
 900                 return 1;
 901 }
 902
 903 static int immediate_feature(int host_index, unsigned int speed, unsigned int timeout)
 904 {
 905         int retr;
 906         unsigned long imm_cmd;
 907
 908         for (retr = 0; retr < 3; retr++) {
 909                 /* select mutation level of the SCSI-adapter */
 910                 imm_cmd = IM_FEATURE_CTR_IMM_CMD;
 911                 imm_cmd |= (unsigned long) ((speed & 0x7) << 29);
 912                 imm_cmd |= (unsigned long) ((timeout & 0x1fff) << 16);
 913                 last_scsi_command(host_index)[MAX_LOG_DEV] = IM_FEATURE_CTR_IMM_CMD;
 914                 last_scsi_type(host_index)[MAX_LOG_DEV] = IM_IMM_CMD;
 915                 got_interrupt(host_index) = 0;
 916                 /* we need to run into command errors in order to probe for the
 917                  * right speed! */
 918                 global_command_error_excuse = 1;
 919                 issue_cmd(host_index, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
 920
 921                 /* FIXME: timeout */
 922                 while (!got_interrupt(host_index))
 923                         barrier();
 924                 if (global_command_error_excuse == CMD_FAIL) {
 925                         global_command_error_excuse = 0;
 926                         return 2;
 927                 } else
 928                         global_command_error_excuse = 0;
 929                 /*if command succesful, break */
 930                 if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
 931                         return 1;
 932         }
 933         if (retr >= 3)
 934                 return 0;
 935         else
 936                 return 1;
 937 }
 938
 939 #ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
 940 static int immediate_reset(int host_index, unsigned int ldn)
 941 {
 942         int retries;
 943         int ticks;
 944         unsigned long imm_command;
 945
 946         for (retries = 0; retries < 3; retries++) {
 947                 imm_command = inl(IM_CMD_REG(host_index));
 948                 imm_command &= (unsigned long) (0xFFFF0000);    /* keep reserved bits */
 949                 imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
 950                 last_scsi_command(host_index)[ldn] = IM_RESET_IMM_CMD;
 951                 last_scsi_type(host_index)[ldn] = IM_IMM_CMD;
 952                 got_interrupt(host_index) = 0;
 953                 reset_status(host_index) = IM_RESET_IN_PROGRESS;
 954                 issue_cmd(host_index, (unsigned long) (imm_command), IM_IMM_CMD | ldn);
 955                 ticks = IM_RESET_DELAY * HZ;
 956                 while (reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks) {
 957                         udelay((1 + 999 / HZ) * 1000);
 958                         barrier();
 959                 }
 960                 /* if reset did not complete, just complain */
 961                 if (!ticks) {
 962                         printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
 963                         reset_status(host_index) = IM_RESET_FINISHED_OK;
 964                         /* did not work, finish */
 965                         return 1;
 966                 }
 967                 /*if command succesful, break */
 968                 if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
 969                         return 1;
 970         }
 971         if (retries >= 3)
 972                 return 0;
 973         else
 974                 return 1;
 975 }
 976 #endif
 977
 978 /* type-interpreter for physical device numbers */
 979 static char *ti_p(int dev)
 980 {
 981         switch (dev) {
 982         case TYPE_IBM_SCSI_ADAPTER:
 983                 return ("A");
 984         case TYPE_DISK:
 985                 return ("D");
 986         case TYPE_TAPE:
 987                 return ("T");
 988         case TYPE_PROCESSOR:
 989                 return ("P");
 990         case TYPE_WORM:
 991                 return ("W");
 992         case TYPE_ROM:
 993                 return ("R");
 994         case TYPE_SCANNER:
 995                 return ("S");
 996         case TYPE_MOD:
 997                 return ("M");
 998         case TYPE_MEDIUM_CHANGER:
 999                 return ("C");
1000         case TYPE_NO_LUN:
1001                 return ("+");   /* show NO_LUN */
1002         }
1003         return ("-");           /* TYPE_NO_DEVICE and others */
1004 }
1005
1006 /* interpreter for logical device numbers (ldn) */
1007 static char *ti_l(int val)
1008 {
1009         const char hex[16] = "0123456789abcdef";
1010         static char answer[2];
1011
1012         answer[1] = (char) (0x0);
1013         if (val <= MAX_LOG_DEV)
1014                 answer[0] = hex[val];
1015         else
1016                 answer[0] = '-';
1017         return (char *) &answer;
1018 }
1019
1020 /* transfers bitpattern of the feature command to values in MHz */
1021 static char *ibmrate(unsigned int speed, int i)
1022 {
1023         switch (speed) {
1024         case 0:
1025                 return i ? "5.00" : "10.00";
1026         case 1:
1027                 return i ? "4.00" : "8.00";
1028         case 2:
1029                 return i ? "3.33" : "6.66";
1030         case 3:
1031                 return i ? "2.86" : "5.00";
1032         case 4:
1033                 return i ? "2.50" : "4.00";
1034         case 5:
1035                 return i ? "2.22" : "3.10";
1036         case 6:
1037                 return i ? "2.00" : "2.50";
1038         case 7:
1039                 return i ? "1.82" : "2.00";
1040         }
1041         return "---";
1042 }
1043
1044 static int probe_display(int what)
1045 {
1046         static int rotator = 0;
1047         const char rotor[] = "|/-\\";
1048
1049         if (!(display_mode & LED_DISP))
1050                 return 0;
1051         if (!what) {
1052                 outl(0x20202020, MOD95_LED_PORT);
1053                 outl(0x20202020, MOD95_LED_PORT + 4);
1054         } else {
1055                 outb('S', MOD95_LED_PORT + 7);
1056                 outb('C', MOD95_LED_PORT + 6);
1057                 outb('S', MOD95_LED_PORT + 5);
1058                 outb('I', MOD95_LED_PORT + 4);
1059                 outb('i', MOD95_LED_PORT + 3);
1060                 outb('n', MOD95_LED_PORT + 2);
1061                 outb('i', MOD95_LED_PORT + 1);
1062                 outb((char) (rotor[rotator]), MOD95_LED_PORT);
1063                 rotator++;
1064                 if (rotator > 3)
1065                         rotator = 0;
1066         }
1067         return 0;
1068 }
1069
1070 static int probe_bus_mode(int host_index)
1071 {
1072         struct im_pos_info *info;
1073         int num_bus = 0;
1074         int ldn;
1075
1076         info = (struct im_pos_info *) (&(ld(host_index)[MAX_LOG_DEV].buf));
1077         if (get_pos_info(host_index)) {
1078                 if (info->connector_size & 0xf000)
1079                         subsystem_connector_size(host_index) = 16;
1080                 else
1081                         subsystem_connector_size(host_index) = 32;
1082                 num_bus |= (info->pos_4b & 8) >> 3;
1083                 for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
1084                         if ((special(host_index) == IBM_SCSI_WCACHE) || (special(host_index) == IBM_7568_WCACHE)) {
1085                                 if (!((info->cache_stat >> ldn) & 1))
1086                                         ld(host_index)[ldn].cache_flag = 0;
1087                         }
1088                         if (!((info->retry_stat >> ldn) & 1))
1089                                 ld(host_index)[ldn].retry_flag = 0;
1090                 }
1091 #ifdef IM_DEBUG_PROBE
1092                 printk("IBM MCA SCSI: SCSI-Cache bits: ");
1093                 for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
1094                         printk("%d", ld(host_index)[ldn].cache_flag);
1095                 }
1096                 printk("\nIBM MCA SCSI: SCSI-Retry bits: ");
1097                 for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
1098                         printk("%d", ld(host_index)[ldn].retry_flag);
1099                 }
1100                 printk("\n");
1101 #endif
1102         }
1103         return num_bus;
1104 }
1105
1106 /* probing scsi devices */
1107 static void check_devices(int host_index, int adaptertype)
1108 {
1109         int id, lun, ldn, ticks;
1110         int count_devices;      /* local counter for connected device */
1111         int max_pun;
1112         int num_bus;
1113         int speedrun;           /* local adapter_speed check variable */
1114
1115         /* assign default values to certain variables */
1116         ticks = 0;
1117         count_devices = 0;
1118         IBM_DS(host_index).dyn_flag = 0;        /* normally no need for dynamical ldn management */
1119         IBM_DS(host_index).total_errors = 0;    /* set errorcounter to 0 */
1120         next_ldn(host_index) = 7;       /* next ldn to be assigned is 7, because 0-6 is 'hardwired' */
1121
1122         /* initialize the very important driver-informational arrays/structs */
1123         memset(ld(host_index), 0, sizeof(ld(host_index)));
1124         for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
1125                 last_scsi_command(host_index)[ldn] = NO_SCSI;   /* emptify last SCSI-command storage */
1126                 last_scsi_type(host_index)[ldn] = 0;
1127                 ld(host_index)[ldn].cache_flag = 1;
1128                 ld(host_index)[ldn].retry_flag = 1;
1129         }
1130         memset(get_ldn(host_index), TYPE_NO_DEVICE, sizeof(get_ldn(host_index)));       /* this is essential ! */
1131         memset(get_scsi(host_index), TYPE_NO_DEVICE, sizeof(get_scsi(host_index)));     /* this is essential ! */
1132         for (lun = 0; lun < 8; lun++) {
1133                 /* mark the adapter at its pun on all luns */
1134                 get_scsi(host_index)[subsystem_pun(host_index)][lun] = TYPE_IBM_SCSI_ADAPTER;
1135                 get_ldn(host_index)[subsystem_pun(host_index)][lun] = MAX_LOG_DEV;      /* make sure, the subsystem
1136                                                                                            ldn is active for all
1137                                                                                            luns. */
1138         }
1139         probe_display(0);       /* Supercool display usage during SCSI-probing. */
1140         /* This makes sense, when booting without any */
1141         /* monitor connected on model XX95. */
1142
1143         /* STEP 1: */
1144         adapter_speed(host_index) = global_adapter_speed;
1145         speedrun = adapter_speed(host_index);
1146         while (immediate_feature(host_index, speedrun, adapter_timeout) == 2) {
1147                 probe_display(1);
1148                 if (speedrun == 7)
1149                         panic("IBM MCA SCSI: Cannot set Synchronous-Transfer-Rate!\n");
1150                 speedrun++;
1151                 if (speedrun > 7)
1152                         speedrun = 7;
1153         }
1154         adapter_speed(host_index) = speedrun;
1155         /* Get detailed information about the current adapter, necessary for
1156          * device operations: */
1157         num_bus = probe_bus_mode(host_index);
1158
1159         /* num_bus contains only valid data for the F/W adapter! */
1160         if (adaptertype == IBM_SCSI2_FW) {      /* F/W SCSI adapter: */
1161                 /* F/W adapter PUN-space extension evaluation: */
1162                 if (num_bus) {
1163                         printk(KERN_INFO "IBM MCA SCSI: Separate bus mode (wide-addressing enabled)\n");
1164                         subsystem_maxid(host_index) = 16;
1165                 } else {
1166                         printk(KERN_INFO "IBM MCA SCSI: Combined bus mode (wide-addressing disabled)\n");
1167                         subsystem_maxid(host_index) = 8;
1168                 }
1169                 printk(KERN_INFO "IBM MCA SCSI: Sync.-Rate (F/W: 20, Int.: 10, Ext.: %s) MBytes/s\n", ibmrate(speedrun, adaptertype));
1170         } else                  /* all other IBM SCSI adapters: */
1171                 printk(KERN_INFO "IBM MCA SCSI: Synchronous-SCSI-Transfer-Rate: %s MBytes/s\n", ibmrate(speedrun, adaptertype));
1172
1173         /* assign correct PUN device space */
1174         max_pun = subsystem_maxid(host_index);
1175
1176 #ifdef IM_DEBUG_PROBE
1177         printk("IBM MCA SCSI: Current SCSI-host index: %d\n", host_index);
1178         printk("IBM MCA SCSI: Removing default logical SCSI-device mapping.");
1179 #else
1180         printk(KERN_INFO "IBM MCA SCSI: Dev. Order: %s, Mapping (takes <2min): ", (ibm_ansi_order) ? "ANSI" : "New");
1181 #endif
1182         for (ldn = 0; ldn < MAX_LOG_DEV; ldn++) {
1183                 probe_display(1);
1184 #ifdef IM_DEBUG_PROBE
1185                 printk(".");
1186 #endif
1187                 immediate_assign(host_index, 0, 0, ldn, REMOVE_LDN);    /* remove ldn (wherever) */
1188         }
1189         lun = 0;                /* default lun is 0 */
1190 #ifndef IM_DEBUG_PROBE
1191         printk("cleared,");
1192 #endif
1193         /* STEP 2: */
1194 #ifdef IM_DEBUG_PROBE
1195         printk("\nIBM MCA SCSI: Scanning SCSI-devices.");
1196 #endif
1197         for (id = 0; id < max_pun; id++)
1198 #ifdef CONFIG_SCSI_MULTI_LUN
1199                 for (lun = 0; lun < 8; lun++)
1200 #endif
1201                 {
1202                         probe_display(1);
1203 #ifdef IM_DEBUG_PROBE
1204                         printk(".");
1205 #endif
1206                         if (id != subsystem_pun(host_index)) {
1207                                 /* if pun is not the adapter: */
1208                                 /* set ldn=0 to pun,lun */
1209                                 immediate_assign(host_index, id, lun, PROBE_LDN, SET_LDN);
1210                                 if (device_inquiry(host_index, PROBE_LDN)) {    /* probe device */
1211                                         get_scsi(host_index)[id][lun] = (unsigned char) (ld(host_index)[PROBE_LDN].buf[0]);
1212                                         /* entry, even for NO_LUN */
1213                                         if (ld(host_index)[PROBE_LDN].buf[0] != TYPE_NO_LUN)
1214                                                 count_devices++;        /* a existing device is found */
1215                                 }
1216                                 /* remove ldn */
1217                                 immediate_assign(host_index, id, lun, PROBE_LDN, REMOVE_LDN);
1218                         }
1219                 }
1220 #ifndef IM_DEBUG_PROBE
1221         printk("scanned,");
1222 #endif
1223         /* STEP 3: */
1224 #ifdef IM_DEBUG_PROBE
1225         printk("\nIBM MCA SCSI: Mapping SCSI-devices.");
1226 #endif
1227         ldn = 0;
1228         lun = 0;
1229 #ifdef CONFIG_SCSI_MULTI_LUN
1230         for (lun = 0; lun < 8 && ldn < MAX_LOG_DEV; lun++)
1231 #endif
1232                 for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
1233                         probe_display(1);
1234 #ifdef IM_DEBUG_PROBE
1235                         printk(".");
1236 #endif
1237                         if (id != subsystem_pun(host_index)) {
1238                                 if (get_scsi(host_index)[id][lun] != TYPE_NO_LUN && get_scsi(host_index)[id][lun] != TYPE_NO_DEVICE) {
1239                                         /* Only map if accepted type. Always enter for
1240                                            lun == 0 to get no gaps into ldn-mapping for ldn<7. */
1241                                         immediate_assign(host_index, id, lun, ldn, SET_LDN);
1242                                         get_ldn(host_index)[id][lun] = ldn;     /* map ldn */
1243                                         if (device_exists(host_index, ldn, &ld(host_index)[ldn].block_length, &ld(host_index)[ldn].device_type)) {
1244 #ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
1245                                                 printk("resetting device at ldn=%x ... ", ldn);
1246                                                 immediate_reset(host_index, ldn);
1247 #endif
1248                                                 ldn++;
1249                                         } else {
1250                                                 /* device vanished, probably because we don't know how to
1251                                                  * handle it or because it has problems */
1252                                                 if (lun > 0) {
1253                                                         /* remove mapping */
1254                                                         get_ldn(host_index)[id][lun] = TYPE_NO_DEVICE;
1255                                                         immediate_assign(host_index, 0, 0, ldn, REMOVE_LDN);
1256                                                 } else
1257                                                         ldn++;
1258                                         }
1259                                 } else if (lun == 0) {
1260                                         /* map lun == 0, even if no device exists */
1261                                         immediate_assign(host_index, id, lun, ldn, SET_LDN);
1262                                         get_ldn(host_index)[id][lun] = ldn;     /* map ldn */
1263                                         ldn++;
1264                                 }
1265                         }
1266                 }
1267         /* STEP 4: */
1268
1269         /* map remaining ldns to non-existing devices */
1270         for (lun = 1; lun < 8 && ldn < MAX_LOG_DEV; lun++)
1271                 for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
1272                         if (get_scsi(host_index)[id][lun] == TYPE_NO_LUN || get_scsi(host_index)[id][lun] == TYPE_NO_DEVICE) {
1273                                 probe_display(1);
1274                                 /* Map remaining ldns only to NON-existing pun,lun
1275                                    combinations to make sure an inquiry will fail.
1276                                    For MULTI_LUN, it is needed to avoid adapter autonome
1277                                    SCSI-remapping. */
1278                                 immediate_assign(host_index, id, lun, ldn, SET_LDN);
1279                                 get_ldn(host_index)[id][lun] = ldn;
1280                                 ldn++;
1281                         }
1282                 }
1283 #ifndef IM_DEBUG_PROBE
1284         printk("mapped.");
1285 #endif
1286         printk("\n");
1287 #ifdef IM_DEBUG_PROBE
1288         if (ibm_ansi_order)
1289                 printk("IBM MCA SCSI: Device order: IBM/ANSI (pun=7 is first).\n");
1290         else
1291                 printk("IBM MCA SCSI: Device order: New Industry Standard (pun=0 is first).\n");
1292 #endif
1293
1294 #ifdef IM_DEBUG_PROBE
1295         /* Show the physical and logical mapping during boot. */
1296         printk("IBM MCA SCSI: Determined SCSI-device-mapping:\n");
1297         printk("    Physical SCSI-Device Map               Logical SCSI-Device Map\n");
1298         printk("ID\\LUN  0  1  2  3  4  5  6  7       ID\\LUN  0  1  2  3  4  5  6  7\n");
1299         for (id = 0; id < max_pun; id++) {
1300                 printk("%2d     ", id);
1301                 for (lun = 0; lun < 8; lun++)
1302                         printk("%2s ", ti_p(get_scsi(host_index)[id][lun]));
1303                 printk("      %2d     ", id);
1304                 for (lun = 0; lun < 8; lun++)
1305                         printk("%2s ", ti_l(get_ldn(host_index)[id][lun]));
1306                 printk("\n");
1307         }
1308 #endif
1309
1310         /* assign total number of found SCSI-devices to the statistics struct */
1311         IBM_DS(host_index).total_scsi_devices = count_devices;
1312
1313         /* decide for output in /proc-filesystem, if the configuration of
1314            SCSI-devices makes dynamical reassignment of devices necessary */
1315         if (count_devices >= MAX_LOG_DEV)
1316                 IBM_DS(host_index).dyn_flag = 1;        /* dynamical assignment is necessary */
1317         else
1318                 IBM_DS(host_index).dyn_flag = 0;        /* dynamical assignment is not necessary */
1319
1320         /* If no SCSI-devices are assigned, return 1 in order to cause message. */
1321         if (ldn == 0)
1322                 printk("IBM MCA SCSI: Warning: No SCSI-devices found/assigned!\n");
1323
1324         /* reset the counters for statistics on the current adapter */
1325         IBM_DS(host_index).scbs = 0;
1326         IBM_DS(host_index).long_scbs = 0;
1327         IBM_DS(host_index).total_accesses = 0;
1328         IBM_DS(host_index).total_interrupts = 0;
1329         IBM_DS(host_index).dynamical_assignments = 0;
1330         memset(IBM_DS(host_index).ldn_access, 0x0, sizeof(IBM_DS(host_index).ldn_access));
1331         memset(IBM_DS(host_index).ldn_read_access, 0x0, sizeof(IBM_DS(host_index).ldn_read_access));
1332         memset(IBM_DS(host_index).ldn_write_access, 0x0, sizeof(IBM_DS(host_index).ldn_write_access));
1333         memset(IBM_DS(host_index).ldn_inquiry_access, 0x0, sizeof(IBM_DS(host_index).ldn_inquiry_access));
1334         memset(IBM_DS(host_index).ldn_modeselect_access, 0x0, sizeof(IBM_DS(host_index).ldn_modeselect_access));
1335         memset(IBM_DS(host_index).ldn_assignments, 0x0, sizeof(IBM_DS(host_index).ldn_assignments));
1336         probe_display(0);
1337         return;
1338 }
1339
1340 static int device_exists(int host_index, int ldn, int *block_length, int *device_type)
1341 {
1342         unsigned char *buf;
1343         /* if no valid device found, return immediately with 0 */
1344         if (!(device_inquiry(host_index, ldn)))
1345                 return 0;
1346         buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
1347         if (*buf == TYPE_ROM) {
1348                 *device_type = TYPE_ROM;
1349                 *block_length = 2048;   /* (standard blocksize for yellow-/red-book) */
1350                 return 1;
1351         }
1352         if (*buf == TYPE_WORM) {
1353                 *device_type = TYPE_WORM;
1354                 *block_length = 2048;
1355                 return 1;
1356         }
1357         if (*buf == TYPE_DISK) {
1358                 *device_type = TYPE_DISK;
1359                 if (read_capacity(host_index, ldn)) {
1360                         *block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
1361                         return 1;
1362                 } else
1363                         return 0;
1364         }
1365         if (*buf == TYPE_MOD) {
1366                 *device_type = TYPE_MOD;
1367                 if (read_capacity(host_index, ldn)) {
1368                         *block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
1369                         return 1;
1370                 } else
1371                         return 0;
1372         }
1373         if (*buf == TYPE_TAPE) {
1374                 *device_type = TYPE_TAPE;
1375                 *block_length = 0;      /* not in use (setting by mt and mtst in op.) */
1376                 return 1;
1377         }
1378         if (*buf == TYPE_PROCESSOR) {
1379                 *device_type = TYPE_PROCESSOR;
1380                 *block_length = 0;      /* they set their stuff on drivers */
1381                 return 1;
1382         }
1383         if (*buf == TYPE_SCANNER) {
1384                 *device_type = TYPE_SCANNER;
1385                 *block_length = 0;      /* they set their stuff on drivers */
1386                 return 1;
1387         }
1388         if (*buf == TYPE_MEDIUM_CHANGER) {
1389                 *device_type = TYPE_MEDIUM_CHANGER;
1390                 *block_length = 0;      /* One never knows, what to expect on a medium
1391                                            changer device. */
1392                 return 1;
1393         }
1394         return 0;
1395 }
1396
1397 static void internal_ibmmca_scsi_setup(char *str, int *ints)
1398 {
1399         int i, j, io_base, id_base;
1400         char *token;
1401
1402         io_base = 0;
1403         id_base = 0;
1404         if (str) {
1405                 j = 0;
1406                 while ((token = strsep(&str, ",")) != NULL) {
1407                         if (!strcmp(token, "activity"))
1408                                 display_mode |= LED_ACTIVITY;
1409                         if (!strcmp(token, "display"))
1410                                 display_mode |= LED_DISP;
1411                         if (!strcmp(token, "adisplay"))
1412                                 display_mode |= LED_ADISP;
1413                         if (!strcmp(token, "normal"))
1414                                 ibm_ansi_order = 0;
1415                         if (!strcmp(token, "ansi"))
1416                                 ibm_ansi_order = 1;
1417                         if (!strcmp(token, "fast"))
1418                                 global_adapter_speed = 0;
1419                         if (!strcmp(token, "medium"))
1420                                 global_adapter_speed = 4;
1421                         if (!strcmp(token, "slow"))
1422                                 global_adapter_speed = 7;
1423                         if ((*token == '-') || (isdigit(*token))) {
1424                                 if (!(j % 2) && (io_base < IM_MAX_HOSTS))
1425                                         io_port[io_base++] = simple_strtoul(token, NULL, 0);
1426                                 if ((j % 2) && (id_base < IM_MAX_HOSTS))
1427                                         scsi_id[id_base++] = simple_strtoul(token, NULL, 0);
1428                                 j++;
1429                         }
1430                 }
1431         } else if (ints) {
1432                 for (i = 0; i < IM_MAX_HOSTS && 2 * i + 2 < ints[0]; i++) {
1433                         io_port[i] = ints[2 * i + 2];
1434                         scsi_id[i] = ints[2 * i + 2];
1435                 }
1436         }
1437         return;
1438 }
1439
1440 static int ibmmca_getinfo(char *buf, int slot, void *dev_id)
1441 {
1442         struct Scsi_Host *shpnt;
1443         int len, speciale, connectore, k;
1444         unsigned int pos[8];
1445         unsigned long flags;
1446         struct Scsi_Host *dev = dev_id;
1447
1448         spin_lock_irqsave(dev->host_lock, flags);
1449
1450         shpnt = dev;            /* assign host-structure to local pointer */
1451         len = 0;                /* set filled text-buffer index to 0 */
1452         /* get the _special contents of the hostdata structure */
1453         speciale = ((struct ibmmca_hostdata *) shpnt->hostdata)->_special;
1454         connectore = ((struct ibmmca_hostdata *) shpnt->hostdata)->_connector_size;
1455         for (k = 2; k < 4; k++)
1456                 pos[k] = ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k];
1457         if (speciale == FORCED_DETECTION) {     /* forced detection */
1458                 len += sprintf(buf + len,
1459                                "Adapter category: forced detected\n" "***************************************\n" "***  Forced detected SCSI Adapter   ***\n" "***  No chip-information available  ***\n" "***************************************\n");
1460         } else if (speciale == INTEGRATED_SCSI) {
1461                 /* if the integrated subsystem has been found automatically: */
1462                 len += sprintf(buf + len,
1463                                "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");
1464         } else if ((speciale >= 0) && (speciale < (sizeof(subsys_list) / sizeof(struct subsys_list_struct)))) {
1465                 /* if the subsystem is a slot adapter */
1466                 len += sprintf(buf + len, "Adapter category: slot-card\n" "ROM Segment Address: ");
1467                 if ((pos[2] & 0xf0) == 0xf0)
1468                         len += sprintf(buf + len, "off\n");
1469                 else
1470                         len += sprintf(buf + len, "0x%x\n", ((pos[2] & 0xf0) << 13) + 0xc0000);
1471                 len += sprintf(buf + len, "Chip status: %s\n", (pos[2] & 1) ? "enabled" : "disabled");
1472                 len += sprintf(buf + len, "Adapter I/O Offset: 0x%x\n", ((pos[2] & 0x0e) << 2));
1473         } else {
1474                 len += sprintf(buf + len, "Adapter category: unknown\n");
1475         }
1476         /* common subsystem information to write to the slotn file */
1477         len += sprintf(buf + len, "Subsystem PUN: %d\n", shpnt->this_id);
1478         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));
1479         len += sprintf(buf + len, "MCA-slot size: %d bits", connectore);
1480         /* Now make sure, the bufferlength is devidable by 4 to avoid
1481          * paging problems of the buffer. */
1482         while (len % sizeof(int) != (sizeof(int) - 1))
1483                 len += sprintf(buf + len, " ");
1484         len += sprintf(buf + len, "\n");
1485
1486         spin_unlock_irqrestore(shpnt->host_lock, flags);
1487
1488         return len;
1489 }
1490
1491 int ibmmca_detect(Scsi_Host_Template * scsi_template)
1492 {
1493         struct Scsi_Host *shpnt;
1494         int port, id, i, j, k, list_size, slot;
1495         int devices_on_irq_11 = 0;
1496         int devices_on_irq_14 = 0;
1497         int IRQ14_registered = 0;
1498         int IRQ11_registered = 0;
1499
1500         found = 0;              /* make absolutely sure, that found is set to 0 */
1501
1502         /* First of all, print the version number of the driver. This is
1503          * important to allow better user bugreports in case of already
1504          * having problems with the MCA_bus probing. */
1505         printk(KERN_INFO "IBM MCA SCSI: Version %s\n", IBMMCA_SCSI_DRIVER_VERSION);
1506         /* if this is not MCA machine, return "nothing found" */
1507         if (!MCA_bus) {
1508                 printk(KERN_INFO "IBM MCA SCSI:  No Microchannel-bus present --> Aborting.\n" "              This machine does not have any IBM MCA-bus\n" "                 or the MCA-Kernel-support is not enabled!\n");
1509                 return 0;
1510         }
1511
1512 #ifdef MODULE
1513         /* If the driver is run as module, read from conf.modules or cmd-line */
1514         if (boot_options)
1515                 option_setup(boot_options);
1516 #endif
1517
1518         /* get interrupt request level */
1519         if (request_irq(IM_IRQ, interrupt_handler, SA_SHIRQ, "ibmmcascsi", hosts)) {
1520                 printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ);
1521                 return 0;
1522         } else
1523                 IRQ14_registered++;
1524
1525         /* if ibmmcascsi setup option was passed to kernel, return "found" */
1526         for (i = 0; i < IM_MAX_HOSTS; i++)
1527                 if (io_port[i] > 0 && scsi_id[i] >= 0 && scsi_id[i] < 8) {
1528                         printk("IBM MCA SCSI: forced detected SCSI Adapter, io=0x%x, scsi id=%d.\n", io_port[i], scsi_id[i]);
1529                         if ((shpnt = ibmmca_register(scsi_template, io_port[i], scsi_id[i], FORCED_DETECTION, "forced detected SCSI Adapter"))) {
1530                                 for (k = 2; k < 7; k++)
1531                                         ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = 0;
1532                                 ((struct ibmmca_hostdata *) shpnt->hostdata)->_special = FORCED_DETECTION;
1533                                 mca_set_adapter_name(MCA_INTEGSCSI, "forced detected SCSI Adapter");
1534                                 mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo, shpnt);
1535                                 mca_mark_as_used(MCA_INTEGSCSI);
1536                                 devices_on_irq_14++;
1537                         }
1538                 }
1539         if (found)
1540                 return found;
1541
1542         /* The POS2-register of all PS/2 model SCSI-subsystems has the following
1543          * interpretation of bits:
1544          *                             Bit 7 - 4 : Chip Revision ID (Release)
1545          *                             Bit 3 - 2 : Reserved
1546          *                             Bit 1     : 8k NVRAM Disabled
1547          *                             Bit 0     : Chip Enable (EN-Signal)
1548          * The POS3-register is interpreted as follows:
1549          *                             Bit 7 - 5 : SCSI ID
1550          *                             Bit 4     : Reserved = 0
1551          *                             Bit 3 - 0 : Reserved = 0
1552          * (taken from "IBM, PS/2 Hardware Interface Technical Reference, Common
1553          * Interfaces (1991)").
1554          * In short words, this means, that IBM PS/2 machines only support
1555          * 1 single subsystem by default. The slot-adapters must have another
1556          * configuration on pos2. Here, one has to assume the following
1557          * things for POS2-register:
1558          *                             Bit 7 - 4 : Chip Revision ID (Release)
1559          *                             Bit 3 - 1 : port offset factor
1560          *                             Bit 0     : Chip Enable (EN-Signal)
1561          * As I found a patch here, setting the IO-registers to 0x3540 forced,
1562          * as there was a 0x05 in POS2 on a model 56, I assume, that the
1563          * port 0x3540 must be fix for integrated SCSI-controllers.
1564          * Ok, this discovery leads to the following implementation: (M.Lang) */
1565
1566         /* first look for the IBM SCSI integrated subsystem on the motherboard */
1567         for (j = 0; j < 8; j++) /* read the pos-information */
1568                 pos[j] = mca_read_stored_pos(MCA_INTEGSCSI, j);
1569         /* pos2 = pos3 = 0xff if there is no integrated SCSI-subsystem present, but
1570          * if we ignore the settings of all surrounding pos registers, it is not
1571          * completely sufficient to only check pos2 and pos3. */
1572         /* Therefore, now the following if statement is used to
1573          * make sure, we see a real integrated onboard SCSI-interface and no
1574          * internal system information, which gets mapped to some pos registers
1575          * on models 95xx. */
1576         if ((!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)) {
1577                 if ((pos[2] & 1) == 1)  /* is the subsystem chip enabled ? */
1578                         port = IM_IO_PORT;
1579                 else {          /* if disabled, no IRQs will be generated, as the chip won't
1580                                  * listen to the incoming commands and will do really nothing,
1581                                  * except for listening to the pos-register settings. If this
1582                                  * happens, I need to hugely think about it, as one has to
1583                                  * write something to the MCA-Bus pos register in order to
1584                                  * enable the chip. Normally, IBM-SCSI won't pass the POST,
1585                                  * when the chip is disabled (see IBM tech. ref.). */
1586                         port = IM_IO_PORT;      /* anyway, set the portnumber and warn */
1587                         printk("IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n" "              SCSI-operations may not work.\n");
1588                 }
1589                 id = (pos[3] & 0xe0) >> 5;      /* this is correct and represents the PUN */
1590                 /* give detailed information on the subsystem. This helps me
1591                  * additionally during debugging and analyzing bug-reports. */
1592                 printk(KERN_INFO "IBM MCA SCSI: IBM Integrated SCSI Controller ffound, io=0x%x, scsi id=%d,\n", port, id);
1593                 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.");
1594
1595                 /* register the found integrated SCSI-subsystem */
1596                 if ((shpnt = ibmmca_register(scsi_template, port, id, INTEGRATED_SCSI, "IBM Integrated SCSI Controller")))
1597                 {
1598                         for (k = 2; k < 7; k++)
1599                                 ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
1600                         ((struct ibmmca_hostdata *) shpnt->hostdata)->_special = INTEGRATED_SCSI;
1601                         mca_set_adapter_name(MCA_INTEGSCSI, "IBM Integrated SCSI Controller");
1602                         mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo, shpnt);
1603                         mca_mark_as_used(MCA_INTEGSCSI);
1604                         devices_on_irq_14++;
1605                 }
1606         }
1607
1608         /* now look for other adapters in MCA slots, */
1609         /* determine the number of known IBM-SCSI-subsystem types */
1610         /* see the pos[2] dependence to get the adapter port-offset. */
1611         list_size = sizeof(subsys_list) / sizeof(struct subsys_list_struct);
1612         for (i = 0; i < list_size; i++) {
1613                 /* scan each slot for a fitting adapter id */
1614                 slot = 0;       /* start at slot 0 */
1615                 while ((slot = mca_find_adapter(subsys_list[i].mca_id, slot))
1616                        != MCA_NOTFOUND) {       /* scan through all slots */
1617                         for (j = 0; j < 8; j++) /* read the pos-information */
1618                                 pos[j] = mca_read_stored_pos(slot, j);
1619                         if ((pos[2] & 1) == 1)
1620                                 /* is the subsystem chip enabled ? */
1621                                 /* (explanations see above) */
1622                                 port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
1623                         else {
1624                                 /* anyway, set the portnumber and warn */
1625                                 port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
1626                                 printk(KERN_WARNING "IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
1627                                 printk(KERN_WARNING "              SCSI-operations may not work.\n");
1628                         }
1629                         if ((i == IBM_SCSI2_FW) && (pos[6] != 0)) {
1630                                 printk(KERN_ERR "IBM MCA SCSI: ERROR - Wrong POS(6)-register setting!\n");
1631                                 printk(KERN_ERR "              Impossible to determine adapter PUN!\n");
1632                                 printk(KERN_ERR "              Guessing adapter PUN = 7.\n");
1633                                 id = 7;
1634                         } else {
1635                                 id = (pos[3] & 0xe0) >> 5;      /* get subsystem PUN */
1636                                 if (i == IBM_SCSI2_FW) {
1637                                         id |= (pos[3] & 0x10) >> 1;     /* get subsystem PUN high-bit
1638                                                                          * for F/W adapters */
1639                                 }
1640                         }
1641                         if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0)) {
1642                                 /* IRQ11 is used by SCSI-2 F/W Adapter/A */
1643                                 printk(KERN_DEBUG "IBM MCA SCSI: SCSI-2 F/W adapter needs IRQ 11.\n");
1644                                 /* get interrupt request level */
1645                                 if (request_irq(IM_IRQ_FW, interrupt_handler, SA_SHIRQ, "ibmmcascsi", hosts)) {
1646                                         printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ_FW);
1647                                 } else
1648                                         IRQ11_registered++;
1649                         }
1650                         printk(KERN_INFO "IBM MCA SCSI: %s found in slot %d, io=0x%x, scsi id=%d,\n", subsys_list[i].description, slot + 1, port, id);
1651                         if ((pos[2] & 0xf0) == 0xf0)
1652                                 printk(KERN_DEBUG"              ROM Addr.=off,");
1653                         else
1654                                 printk(KERN_DEBUG "              ROM Addr.=0x%x,", ((pos[2] & 0xf0) << 13) + 0xc0000);
1655                         printk(KERN_DEBUG " port-offset=0x%x, subsystem=%s\n", ((pos[2] & 0x0e) << 2), (pos[2] & 1) ? "enabled." : "disabled.");
1656
1657                         /* register the hostadapter */
1658                         if ((shpnt = ibmmca_register(scsi_template, port, id, i, subsys_list[i].description))) {
1659                                 for (k = 2; k < 8; k++)
1660                                         ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
1661                                 ((struct ibmmca_hostdata *) shpnt->hostdata)->_special = i;
1662                                 mca_set_adapter_name(slot, subsys_list[i].description);
1663                                 mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmmca_getinfo, shpnt);
1664                                 mca_mark_as_used(slot);
1665                                 if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0))
1666                                         devices_on_irq_11++;
1667                                 else
1668                                         devices_on_irq_14++;
1669                         }
1670                         slot++; /* advance to next slot */
1671                 }               /* advance to next adapter id in the list of IBM-SCSI-subsystems */
1672         }
1673
1674         /* now check for SCSI-adapters, mapped to the integrated SCSI
1675          * area. E.g. a W/Cache in MCA-slot 9(!). Do the check correct here,
1676          * as this is a known effect on some models 95xx. */
1677         list_size = sizeof(subsys_list) / sizeof(struct subsys_list_struct);
1678         for (i = 0; i < list_size; i++) {
1679                 /* scan each slot for a fitting adapter id */
1680                 slot = mca_find_adapter(subsys_list[i].mca_id, MCA_INTEGSCSI);
1681                 if (slot != MCA_NOTFOUND) {     /* scan through all slots */
1682                         for (j = 0; j < 8; j++) /* read the pos-information */
1683                                 pos[j] = mca_read_stored_pos(slot, j);
1684                         if ((pos[2] & 1) == 1) {        /* is the subsystem chip enabled ? */
1685                                 /* (explanations see above) */
1686                                 port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
1687                         } else {        /* anyway, set the portnumber and warn */
1688                                 port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
1689                                 printk(KERN_WARNING "IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
1690                                 printk(KERN_WARNING "              SCSI-operations may not work.\n");
1691                         }
1692                         if ((i == IBM_SCSI2_FW) && (pos[6] != 0)) {
1693                                 printk(KERN_ERR "IBM MCA SCSI: ERROR - Wrong POS(6)-register setting!\n");
1694                                 printk(KERN_ERR  "              Impossible to determine adapter PUN!\n");
1695                                 printk(KERN_ERR "              Guessing adapter PUN = 7.\n");
1696                                 id = 7;
1697                         } else {
1698                                 id = (pos[3] & 0xe0) >> 5;      /* get subsystem PUN */
1699                                 if (i == IBM_SCSI2_FW)
1700                                         id |= (pos[3] & 0x10) >> 1;     /* get subsystem PUN high-bit
1701                                                                          * for F/W adapters */
1702                         }
1703                         if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0)) {
1704                                 /* IRQ11 is used by SCSI-2 F/W Adapter/A */
1705                                 printk(KERN_DEBUG  "IBM MCA SCSI: SCSI-2 F/W adapter needs IRQ 11.\n");
1706                                 /* get interrupt request level */
1707                                 if (request_irq(IM_IRQ_FW, interrupt_handler, SA_SHIRQ, "ibmmcascsi", hosts))
1708                                         printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ_FW);
1709                                 else
1710                                         IRQ11_registered++;
1711                         }
1712                         printk(KERN_INFO "IBM MCA SCSI: %s found in slot %d, io=0x%x, scsi id=%d,\n", subsys_list[i].description, slot + 1, port, id);
1713                         if ((pos[2] & 0xf0) == 0xf0)
1714                                 printk(KERN_DEBUG "              ROM Addr.=off,");
1715                         else
1716                                 printk(KERN_DEBUG "              ROM Addr.=0x%x,", ((pos[2] & 0xf0) << 13) + 0xc0000);
1717                         printk(KERN_DEBUG " port-offset=0x%x, subsystem=%s\n", ((pos[2] & 0x0e) << 2), (pos[2] & 1) ? "enabled." : "disabled.");
1718
1719                         /* register the hostadapter */
1720                         if ((shpnt = ibmmca_register(scsi_template, port, id, i, subsys_list[i].description))) {
1721                                 for (k = 2; k < 7; k++)
1722                                         ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
1723                                 ((struct ibmmca_hostdata *) shpnt->hostdata)->_special = i;
1724                                 mca_set_adapter_name(slot, subsys_list[i].description);
1725                                 mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmmca_getinfo, shpnt);
1726                                 mca_mark_as_used(slot);
1727                                 if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0))
1728                                         devices_on_irq_11++;
1729                                 else
1730                                         devices_on_irq_14++;
1731                         }
1732                         slot++; /* advance to next slot */
1733                 }               /* advance to next adapter id in the list of IBM-SCSI-subsystems */
1734         }
1735         if (IRQ11_registered && !devices_on_irq_11)
1736                 free_irq(IM_IRQ_FW, hosts);     /* no devices on IRQ 11 */
1737         if (IRQ14_registered && !devices_on_irq_14)
1738                 free_irq(IM_IRQ, hosts);        /* no devices on IRQ 14 */
1739         if (!devices_on_irq_11 && !devices_on_irq_14)
1740                 printk(KERN_WARNING "IBM MCA SCSI: No IBM SCSI-subsystem adapter attached.\n");
1741         return found;           /* return the number of found SCSI hosts. Should be 1 or 0. */
1742 }
1743
1744 static struct Scsi_Host *ibmmca_register(Scsi_Host_Template * scsi_template, int port, int id, int adaptertype, char *hostname)
1745 {
1746         struct Scsi_Host *shpnt;
1747         int i, j;
1748         unsigned int ctrl;
1749
1750         /* check I/O region */
1751         if (!request_region(port, IM_N_IO_PORT, hostname)) {
1752                 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);
1753                 return NULL;
1754         }
1755
1756         /* register host */
1757         shpnt = scsi_register(scsi_template, sizeof(struct ibmmca_hostdata));
1758         if (!shpnt) {
1759                 printk(KERN_ERR "IBM MCA SCSI: Unable to register host.\n");
1760                 release_region(port, IM_N_IO_PORT);
1761                 return NULL;
1762         }
1763
1764         /* request I/O region */
1765         hosts[found] = shpnt;   /* add new found hostadapter to the list */
1766         special(found) = adaptertype;   /* important assignment or else crash! */
1767         subsystem_connector_size(found) = 0;    /* preset slot-size */
1768         shpnt->irq = IM_IRQ;    /* assign necessary stuff for the adapter */
1769         shpnt->io_port = port;
1770         shpnt->n_io_port = IM_N_IO_PORT;
1771         shpnt->this_id = id;
1772         shpnt->max_id = 8;      /* 8 PUNs are default */
1773         /* now, the SCSI-subsystem is connected to Linux */
1774
1775         ctrl = (unsigned int) (inb(IM_CTR_REG(found))); /* get control-register status */
1776 #ifdef IM_DEBUG_PROBE
1777         printk("IBM MCA SCSI: Control Register contents: %x, status: %x\n", ctrl, inb(IM_STAT_REG(found)));
1778         printk("IBM MCA SCSI: This adapters' POS-registers: ");
1779         for (i = 0; i < 8; i++)
1780                 printk("%x ", pos[i]);
1781         printk("\n");
1782 #endif
1783         reset_status(found) = IM_RESET_NOT_IN_PROGRESS;
1784
1785         for (i = 0; i < 16; i++)        /* reset the tables */
1786                 for (j = 0; j < 8; j++)
1787                         get_ldn(found)[i][j] = MAX_LOG_DEV;
1788
1789         /* check which logical devices exist */
1790         /* after this line, local interrupting is possible: */
1791         local_checking_phase_flag(found) = 1;
1792         check_devices(found, adaptertype);      /* call by value, using the global variable hosts */
1793         local_checking_phase_flag(found) = 0;
1794         found++;                /* now increase index to be prepared for next found subsystem */
1795         /* an ibm mca subsystem has been detected */
1796         return shpnt;
1797 }
1798
1799 static int ibmmca_release(struct Scsi_Host *shpnt)
1800 {
1801         release_region(shpnt->io_port, shpnt->n_io_port);
1802         if (!(--found))
1803                 free_irq(shpnt->irq, hosts);
1804         return 0;
1805 }
1806
1807 /* The following routine is the SCSI command queue for the midlevel driver */
1808 static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
1809 {
1810         unsigned int ldn;
1811         unsigned int scsi_cmd;
1812         struct im_scb *scb;
1813         struct Scsi_Host *shpnt;
1814         int current_ldn;
1815         int id, lun;
1816         int target;
1817         int host_index;
1818         int max_pun;
1819         int i;
1820         struct scatterlist *sl;
1821
1822         shpnt = cmd->device->host;
1823         /* search for the right hostadapter */
1824         for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);
1825
1826         if (!hosts[host_index]) {       /* invalid hostadapter descriptor address */
1827                 cmd->result = DID_NO_CONNECT << 16;
1828                 if (done)
1829                         done(cmd);
1830                 return 0;
1831         }
1832         max_pun = subsystem_maxid(host_index);
1833         if (ibm_ansi_order) {
1834                 target = max_pun - 1 - cmd->device->id;
1835                 if ((target <= subsystem_pun(host_index)) && (cmd->device->id <= subsystem_pun(host_index)))
1836                         target--;
1837                 else if ((target >= subsystem_pun(host_index)) && (cmd->device->id >= subsystem_pun(host_index)))
1838                         target++;
1839         } else
1840                 target = cmd->device->id;
1841
1842         /* if (target,lun) is NO LUN or not existing at all, return error */
1843         if ((get_scsi(host_index)[target][cmd->device->lun] == TYPE_NO_LUN) || (get_scsi(host_index)[target][cmd->device->lun] == TYPE_NO_DEVICE)) {
1844                 cmd->result = DID_NO_CONNECT << 16;
1845                 if (done)
1846                         done(cmd);
1847                 return 0;
1848         }
1849
1850         /*if (target,lun) unassigned, do further checks... */
1851         ldn = get_ldn(host_index)[target][cmd->device->lun];
1852         if (ldn >= MAX_LOG_DEV) {       /* on invalid ldn do special stuff */
1853                 if (ldn > MAX_LOG_DEV) {        /* dynamical remapping if ldn unassigned */
1854                         current_ldn = next_ldn(host_index);     /* stop-value for one circle */
1855                         while (ld(host_index)[next_ldn(host_index)].cmd) {      /* search for a occupied, but not in */
1856                                 /* command-processing ldn. */
1857                                 next_ldn(host_index)++;
1858                                 if (next_ldn(host_index) >= MAX_LOG_DEV)
1859                                         next_ldn(host_index) = 7;
1860                                 if (current_ldn == next_ldn(host_index)) {      /* One circle done ? */
1861                                         /* no non-processing ldn found */
1862                                         printk("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 (%d,%d).\n", target, cmd->device->lun);
1863                                         cmd->result = DID_NO_CONNECT << 16;     /* return no connect */
1864                                         if (done)
1865                                                 done(cmd);
1866                                         return 0;
1867                                 }
1868                         }
1869
1870                         /* unmap non-processing ldn */
1871                         for (id = 0; id < max_pun; id++)
1872                                 for (lun = 0; lun < 8; lun++) {
1873                                         if (get_ldn(host_index)[id][lun] == next_ldn(host_index)) {
1874                                                 get_ldn(host_index)[id][lun] = TYPE_NO_DEVICE;
1875                                                 get_scsi(host_index)[id][lun] = TYPE_NO_DEVICE;
1876                                                 /* unmap entry */
1877                                         }
1878                                 }
1879                         /* set reduced interrupt_handler-mode for checking */
1880                         local_checking_phase_flag(host_index) = 1;
1881                         /* map found ldn to pun,lun */
1882                         get_ldn(host_index)[target][cmd->device->lun] = next_ldn(host_index);
1883                         /* change ldn to the right value, that is now next_ldn */
1884                         ldn = next_ldn(host_index);
1885                         /* unassign all ldns (pun,lun,ldn does not matter for remove) */
1886                         immediate_assign(host_index, 0, 0, 0, REMOVE_LDN);
1887                         /* set only LDN for remapped device */
1888                         immediate_assign(host_index, target, cmd->device->lun, ldn, SET_LDN);
1889                         /* get device information for ld[ldn] */
1890                         if (device_exists(host_index, ldn, &ld(host_index)[ldn].block_length, &ld(host_index)[ldn].device_type)) {
1891                                 ld(host_index)[ldn].cmd = NULL; /* To prevent panic set 0, because
1892                                                                    devices that were not assigned,
1893                                                                    should have nothing in progress. */
1894                                 get_scsi(host_index)[target][cmd->device->lun] = ld(host_index)[ldn].device_type;
1895                                 /* increase assignment counters for statistics in /proc */
1896                                 IBM_DS(host_index).dynamical_assignments++;
1897                                 IBM_DS(host_index).ldn_assignments[ldn]++;
1898                         } else
1899                                 /* panic here, because a device, found at boottime has
1900                                    vanished */
1901                                 panic("IBM MCA SCSI: ldn=0x%x, SCSI-device on (%d,%d) vanished!\n", ldn, target, cmd->device->lun);
1902                         /* unassign again all ldns (pun,lun,ldn does not matter for remove) */
1903                         immediate_assign(host_index, 0, 0, 0, REMOVE_LDN);
1904                         /* remap all ldns, as written in the pun/lun table */
1905                         lun = 0;
1906 #ifdef CONFIG_SCSI_MULTI_LUN
1907                         for (lun = 0; lun < 8; lun++)
1908 #endif
1909                                 for (id = 0; id < max_pun; id++) {
1910                                         if (get_ldn(host_index)[id][lun] <= MAX_LOG_DEV)
1911                                                 immediate_assign(host_index, id, lun, get_ldn(host_index)[id][lun], SET_LDN);
1912                                 }
1913                         /* set back to normal interrupt_handling */
1914                         local_checking_phase_flag(host_index) = 0;
1915 #ifdef IM_DEBUG_PROBE
1916                         /* Information on syslog terminal */
1917                         printk("IBM MCA SCSI: ldn=0x%x dynamically reassigned to (%d,%d).\n", ldn, target, cmd->device->lun);
1918 #endif
1919                         /* increase next_ldn for next dynamical assignment */
1920                         next_ldn(host_index)++;
1921                         if (next_ldn(host_index) >= MAX_LOG_DEV)
1922                                 next_ldn(host_index) = 7;
1923                 } else {        /* wall against Linux accesses to the subsystem adapter */
1924                         cmd->result = DID_BAD_TARGET << 16;
1925                         if (done)
1926                                 done(cmd);
1927                         return 0;
1928                 }
1929         }
1930
1931         /*verify there is no command already in progress for this log dev */
1932         if (ld(host_index)[ldn].cmd)
1933                 panic("IBM MCA SCSI: cmd already in progress for this ldn.\n");
1934
1935         /*save done in cmd, and save cmd for the interrupt handler */
1936         cmd->scsi_done = done;
1937         ld(host_index)[ldn].cmd = cmd;
1938
1939         /*fill scb information independent of the scsi command */
1940         scb = &(ld(host_index)[ldn].scb);
1941         ld(host_index)[ldn].tsb.dev_status = 0;
1942         scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE;
1943         scb->tsb_adr = isa_virt_to_bus(&(ld(host_index)[ldn].tsb));
1944         scsi_cmd = cmd->cmnd[0];
1945
1946         if (cmd->use_sg) {
1947                 i = cmd->use_sg;
1948                 sl = (struct scatterlist *) (cmd->request_buffer);
1949                 if (i > 16)
1950                         panic("IBM MCA SCSI: scatter-gather list too long.\n");
1951                 while (--i >= 0) {
1952                         ld(host_index)[ldn].sge[i].address = (void *) (isa_page_to_bus(sl[i].page) + sl[i].offset);
1953                         ld(host_index)[ldn].sge[i].byte_length = sl[i].length;
1954                 }
1955                 scb->enable |= IM_POINTER_TO_LIST;
1956                 scb->sys_buf_adr = isa_virt_to_bus(&(ld(host_index)[ldn].sge[0]));
1957                 scb->sys_buf_length = cmd->use_sg * sizeof(struct im_sge);
1958         } else {
1959                 scb->sys_buf_adr = isa_virt_to_bus(cmd->request_buffer);
1960                 /* recent Linux midlevel SCSI places 1024 byte for inquiry
1961                  * command. Far too much for old PS/2 hardware. */
1962                 switch (scsi_cmd) {
1963                         /* avoid command errors by setting bufferlengths to
1964                          * ANSI-standard. Beware of forcing it to 255,
1965                          * this could SEGV the kernel!!! */
1966                 case INQUIRY:
1967                 case REQUEST_SENSE:
1968                 case MODE_SENSE:
1969                 case MODE_SELECT:
1970                         if (cmd->request_bufflen > 255)
1971                                 scb->sys_buf_length = 255;
1972                         else
1973                                 scb->sys_buf_length = cmd->request_bufflen;
1974                         break;
1975                 case TEST_UNIT_READY:
1976                         scb->sys_buf_length = 0;
1977                         break;
1978                 default:
1979                         scb->sys_buf_length = cmd->request_bufflen;
1980                         break;
1981                 }
1982         }
1983         /*fill scb information dependent on scsi command */
1984
1985 #ifdef IM_DEBUG_CMD
1986         printk("issue scsi cmd=%02x to ldn=%d\n", scsi_cmd, ldn);
1987 #endif
1988
1989         /* for specific device-type debugging: */
1990 #ifdef IM_DEBUG_CMD_SPEC_DEV
1991         if (ld(host_index)[ldn].device_type == IM_DEBUG_CMD_DEVICE)
1992                 printk("(SCSI-device-type=0x%x) issue scsi cmd=%02x to ldn=%d\n", ld(host_index)[ldn].device_type, scsi_cmd, ldn);
1993 #endif
1994
1995         /* for possible panics store current command */
1996         last_scsi_command(host_index)[ldn] = scsi_cmd;
1997         last_scsi_type(host_index)[ldn] = IM_SCB;
1998         /* update statistical info */
1999         IBM_DS(host_index).total_accesses++;
2000         IBM_DS(host_index).ldn_access[ldn]++;
2001
2002         switch (scsi_cmd) {
2003         case READ_6:
2004         case WRITE_6:
2005         case READ_10:
2006         case WRITE_10:
2007         case READ_12:
2008         case WRITE_12:
2009                 /* Distinguish between disk and other devices. Only disks (that are the
2010                    most frequently accessed devices) should be supported by the
2011                    IBM-SCSI-Subsystem commands. */
2012                 switch (ld(host_index)[ldn].device_type) {
2013                 case TYPE_DISK: /* for harddisks enter here ... */
2014                 case TYPE_MOD:  /* ... try it also for MO-drives (send flames as */
2015                         /*     you like, if this won't work.) */
2016                         if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12) {
2017                                 /* read command preparations */
2018                                 scb->enable |= IM_READ_CONTROL;
2019                                 IBM_DS(host_index).ldn_read_access[ldn]++;      /* increase READ-access on ldn stat. */
2020                                 scb->command = IM_READ_DATA_CMD | IM_NO_DISCONNECT;
2021                         } else {        /* write command preparations */
2022                                 IBM_DS(host_index).ldn_write_access[ldn]++;     /* increase write-count on ldn stat. */
2023                                 scb->command = IM_WRITE_DATA_CMD | IM_NO_DISCONNECT;
2024                         }
2025                         if (scsi_cmd == READ_6 || scsi_cmd == WRITE_6) {
2026                                 scb->u1.log_blk_adr = (((unsigned) cmd->cmnd[3]) << 0) | (((unsigned) cmd->cmnd[2]) << 8) | ((((unsigned) cmd->cmnd[1]) & 0x1f) << 16);
2027                                 scb->u2.blk.count = (unsigned) cmd->cmnd[4];
2028                         } else {
2029                                 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);
2030                                 scb->u2.blk.count = (((unsigned) cmd->cmnd[8]) << 0) | (((unsigned) cmd->cmnd[7]) << 8);
2031                         }
2032                         last_scsi_logical_block(host_index)[ldn] = scb->u1.log_blk_adr;
2033                         last_scsi_blockcount(host_index)[ldn] = scb->u2.blk.count;
2034                         scb->u2.blk.length = ld(host_index)[ldn].block_length;
2035                         break;
2036                         /* for other devices, enter here. Other types are not known by
2037                            Linux! TYPE_NO_LUN is forbidden as valid device. */
2038                 case TYPE_ROM:
2039                 case TYPE_TAPE:
2040                 case TYPE_PROCESSOR:
2041                 case TYPE_WORM:
2042                 case TYPE_SCANNER:
2043                 case TYPE_MEDIUM_CHANGER:
2044                         /* If there is a sequential-device, IBM recommends to use
2045                            IM_OTHER_SCSI_CMD_CMD instead of subsystem READ/WRITE.
2046                            This includes CD-ROM devices, too, due to the partial sequential
2047                            read capabilities. */
2048                         scb->command = IM_OTHER_SCSI_CMD_CMD;
2049                         if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12)
2050                                 /* enable READ */
2051                                 scb->enable |= IM_READ_CONTROL;
2052                         scb->enable |= IM_BYPASS_BUFFER;
2053                         scb->u1.scsi_cmd_length = cmd->cmd_len;
2054                         memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
2055                         last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
2056                         /* Read/write on this non-disk devices is also displayworthy,
2057                            so flash-up the LED/display. */
2058                         break;
2059                 }
2060                 break;
2061         case INQUIRY:
2062                 IBM_DS(host_index).ldn_inquiry_access[ldn]++;
2063                 scb->command = IM_DEVICE_INQUIRY_CMD;
2064                 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
2065                 scb->u1.log_blk_adr = 0;
2066                 break;
2067         case TEST_UNIT_READY:
2068                 scb->command = IM_OTHER_SCSI_CMD_CMD;
2069                 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
2070                 scb->u1.log_blk_adr = 0;
2071                 scb->u1.scsi_cmd_length = 6;
2072                 memcpy(scb->u2.scsi_command, cmd->cmnd, 6);
2073                 last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
2074                 break;
2075         case READ_CAPACITY:
2076                 /* the length of system memory buffer must be exactly 8 bytes */
2077                 scb->command = IM_READ_CAPACITY_CMD;
2078                 scb->enable |= IM_READ_CONTROL | IM_BYPASS_BUFFER;
2079                 if (scb->sys_buf_length > 8)
2080                         scb->sys_buf_length = 8;
2081                 break;
2082                 /* Commands that need read-only-mode (system <- device): */
2083         case REQUEST_SENSE:
2084                 scb->command = IM_REQUEST_SENSE_CMD;
2085                 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
2086                 break;
2087                 /* Commands that need write-only-mode (system -> device): */
2088         case MODE_SELECT:
2089         case MODE_SELECT_10:
2090                 IBM_DS(host_index).ldn_modeselect_access[ldn]++;
2091                 scb->command = IM_OTHER_SCSI_CMD_CMD;
2092                 scb->enable |= IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;   /*Select needs WRITE-enabled */
2093                 scb->u1.scsi_cmd_length = cmd->cmd_len;
2094                 memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
2095                 last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
2096                 break;
2097                 /* For other commands, read-only is useful. Most other commands are
2098                    running without an input-data-block. */
2099         default:
2100                 scb->command = IM_OTHER_SCSI_CMD_CMD;
2101                 scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
2102                 scb->u1.scsi_cmd_length = cmd->cmd_len;
2103                 memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
2104                 last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
2105                 break;
2106         }
2107         /*issue scb command, and return */
2108         if (++disk_rw_in_progress == 1)
2109                 PS2_DISK_LED_ON(shpnt->host_no, target);
2110
2111         if (last_scsi_type(host_index)[ldn] == IM_LONG_SCB) {
2112                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_LONG_SCB | ldn);
2113                 IBM_DS(host_index).long_scbs++;
2114         } else {
2115                 issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
2116                 IBM_DS(host_index).scbs++;
2117         }
2118         return 0;
2119 }
2120
2121 static int __ibmmca_abort(Scsi_Cmnd * cmd)
2122 {
2123         /* Abort does not work, as the adapter never generates an interrupt on
2124          * whatever situation is simulated, even when really pending commands
2125          * are running on the adapters' hardware ! */
2126
2127         struct Scsi_Host *shpnt;
2128         unsigned int ldn;
2129         void (*saved_done) (Scsi_Cmnd *);
2130         int target;
2131         int host_index;
2132         int max_pun;
2133         unsigned long imm_command;
2134
2135 #ifdef IM_DEBUG_PROBE
2136         printk("IBM MCA SCSI: Abort subroutine called...\n");
2137 #endif
2138
2139         shpnt = cmd->device->host;
2140         /* search for the right hostadapter */
2141         for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);
2142
2143         if (!hosts[host_index]) {       /* invalid hostadapter descriptor address */
2144                 cmd->result = DID_NO_CONNECT << 16;
2145                 if (cmd->scsi_done)
2146                         (cmd->scsi_done) (cmd);
2147                 shpnt = cmd->device->host;
2148 #ifdef IM_DEBUG_PROBE
2149                 printk(KERN_DEBUG "IBM MCA SCSI: Abort adapter selection failed!\n");
2150 #endif
2151                 return SUCCESS;
2152         }
2153         max_pun = subsystem_maxid(host_index);
2154         if (ibm_ansi_order) {
2155                 target = max_pun - 1 - cmd->device->id;
2156                 if ((target <= subsystem_pun(host_index)) && (cmd->device->id <= subsystem_pun(host_index)))
2157                         target--;
2158                 else if ((target >= subsystem_pun(host_index)) && (cmd->device->id >= subsystem_pun(host_index)))
2159                         target++;
2160         } else
2161                 target = cmd->device->id;
2162
2163         /* get logical device number, and disable system interrupts */
2164         printk(KERN_WARNING "IBM MCA SCSI: Sending abort to device pun=%d, lun=%d.\n", target, cmd->device->lun);
2165         ldn = get_ldn(host_index)[target][cmd->device->lun];
2166
2167         /*if cmd for this ldn has already finished, no need to abort */
2168         if (!ld(host_index)[ldn].cmd) {
2169                     return SUCCESS;
2170         }
2171
2172         /* Clear ld.cmd, save done function, install internal done,
2173          * send abort immediate command (this enables sys. interrupts),
2174          * and wait until the interrupt arrives.
2175          */
2176         saved_done = cmd->scsi_done;
2177         cmd->scsi_done = internal_done;
2178         cmd->SCp.Status = 0;
2179         last_scsi_command(host_index)[ldn] = IM_ABORT_IMM_CMD;
2180         last_scsi_type(host_index)[ldn] = IM_IMM_CMD;
2181         imm_command = inl(IM_CMD_REG(host_index));
2182         imm_command &= (unsigned long) (0xffff0000);    /* mask reserved stuff */
2183         imm_command |= (unsigned long) (IM_ABORT_IMM_CMD);
2184         /* must wait for attention reg not busy */
2185         /* FIXME - timeout, politeness */
2186         while (1) {
2187                 if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
2188                         break;
2189         }
2190         /* write registers and enable system interrupts */
2191         outl(imm_command, IM_CMD_REG(host_index));
2192         outb(IM_IMM_CMD | ldn, IM_ATTN_REG(host_index));
2193 #ifdef IM_DEBUG_PROBE
2194         printk("IBM MCA SCSI: Abort queued to adapter...\n");
2195 #endif
2196         spin_unlock_irq(shpnt->host_lock);
2197         while (!cmd->SCp.Status)
2198                 yield();
2199         spin_lock_irq(shpnt->host_lock);
2200         cmd->scsi_done = saved_done;
2201 #ifdef IM_DEBUG_PROBE
2202         printk("IBM MCA SCSI: Abort returned with adapter response...\n");
2203 #endif
2204
2205         /*if abort went well, call saved done, then return success or error */
2206         if (cmd->result == (DID_ABORT << 16))
2207         {
2208                 cmd->result |= DID_ABORT << 16;
2209                 if (cmd->scsi_done)
2210                         (cmd->scsi_done) (cmd);
2211                 ld(host_index)[ldn].cmd = NULL;
2212 #ifdef IM_DEBUG_PROBE
2213                 printk("IBM MCA SCSI: Abort finished with success.\n");
2214 #endif
2215                 return SUCCESS;
2216         } else {
2217                 cmd->result |= DID_NO_CONNECT << 16;
2218                 if (cmd->scsi_done)
2219                         (cmd->scsi_done) (cmd);
2220                 ld(host_index)[ldn].cmd = NULL;
2221 #ifdef IM_DEBUG_PROBE
2222                 printk("IBM MCA SCSI: Abort failed.\n");
2223 #endif
2224                 return FAILED;
2225         }
2226 }
2227
2228 static int ibmmca_abort(Scsi_Cmnd * cmd)
2229 {
2230         struct Scsi_Host *shpnt = cmd->device->host;
2231         int rc;
2232
2233         spin_lock_irq(shpnt->host_lock);
2234         rc = __ibmmca_abort(cmd);
2235         spin_unlock_irq(shpnt->host_lock);
2236
2237         return rc;
2238 }
2239
2240 static int ibmmca_host_reset(Scsi_Cmnd * cmd)
2241 {
2242         struct Scsi_Host *shpnt;
2243         Scsi_Cmnd *cmd_aid;
2244         int ticks, i;
2245         int host_index;
2246         unsigned long imm_command;
2247
2248         if (cmd == NULL)
2249                 BUG();
2250
2251         ticks = IM_RESET_DELAY * HZ;
2252         shpnt = cmd->device->host;
2253         /* search for the right hostadapter */
2254         for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);
2255
2256         if (!hosts[host_index]) /* invalid hostadapter descriptor address */
2257                 return FAILED;
2258
2259         if (local_checking_phase_flag(host_index)) {
2260                 printk(KERN_WARNING "IBM MCA SCSI: unable to reset while checking devices.\n");
2261                 return FAILED;
2262         }
2263
2264         /* issue reset immediate command to subsystem, and wait for interrupt */
2265         printk("IBM MCA SCSI: resetting all devices.\n");
2266         reset_status(host_index) = IM_RESET_IN_PROGRESS;
2267         last_scsi_command(host_index)[0xf] = IM_RESET_IMM_CMD;
2268         last_scsi_type(host_index)[0xf] = IM_IMM_CMD;
2269         imm_command = inl(IM_CMD_REG(host_index));
2270         imm_command &= (unsigned long) (0xffff0000);    /* mask reserved stuff */
2271         imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
2272         /* must wait for attention reg not busy */
2273         while (1) {
2274                 if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
2275                         break;
2276                 spin_unlock_irq(shpnt->host_lock);
2277                 yield();
2278                 spin_lock_irq(shpnt->host_lock);
2279         }
2280         /*write registers and enable system interrupts */
2281         outl(imm_command, IM_CMD_REG(host_index));
2282         outb(IM_IMM_CMD | 0xf, IM_ATTN_REG(host_index));
2283         /* wait for interrupt finished or intr_stat register to be set, as the
2284          * interrupt will not be executed, while we are in here! */
2285
2286         /* FIXME: This is really really icky we so want a sleeping version of this ! */
2287         while (reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks && ((inb(IM_INTR_REG(host_index)) & 0x8f) != 0x8f)) {
2288                 udelay((1 + 999 / HZ) * 1000);
2289                 barrier();
2290         }
2291         /* if reset did not complete, just return an error */
2292         if (!ticks) {
2293                 printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
2294                 reset_status(host_index) = IM_RESET_FINISHED_FAIL;
2295                 return FAILED;
2296         }
2297
2298         if ((inb(IM_INTR_REG(host_index)) & 0x8f) == 0x8f) {
2299                 /* analysis done by this routine and not by the intr-routine */
2300                 if (inb(IM_INTR_REG(host_index)) == 0xaf)
2301                         reset_status(host_index) = IM_RESET_FINISHED_OK_NO_INT;
2302                 else if (inb(IM_INTR_REG(host_index)) == 0xcf)
2303                         reset_status(host_index) = IM_RESET_FINISHED_FAIL;
2304                 else            /* failed, 4get it */
2305                         reset_status(host_index) = IM_RESET_NOT_IN_PROGRESS_NO_INT;
2306                 outb(IM_EOI | 0xf, IM_ATTN_REG(host_index));
2307         }
2308
2309         /* if reset failed, just return an error */
2310         if (reset_status(host_index) == IM_RESET_FINISHED_FAIL) {
2311                 printk(KERN_ERR "IBM MCA SCSI: reset failed.\n");
2312                 return FAILED;
2313         }
2314
2315         /* so reset finished ok - call outstanding done's, and return success */
2316         printk(KERN_INFO "IBM MCA SCSI: Reset successfully completed.\n");
2317         for (i = 0; i < MAX_LOG_DEV; i++) {
2318                 cmd_aid = ld(host_index)[i].cmd;
2319                 if (cmd_aid && cmd_aid->scsi_done) {
2320                         ld(host_index)[i].cmd = NULL;
2321                         cmd_aid->result = DID_RESET << 16;
2322                 }
2323         }
2324         return SUCCESS;
2325 }
2326
2327 static int ibmmca_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int *info)
2328 {
2329         int size = capacity;
2330         info[0] = 64;
2331         info[1] = 32;
2332         info[2] = size / (info[0] * info[1]);
2333         if (info[2] >= 1024) {
2334                 info[0] = 128;
2335                 info[1] = 63;
2336                 info[2] = size / (info[0] * info[1]);
2337                 if (info[2] >= 1024) {
2338                         info[0] = 255;
2339                         info[1] = 63;
2340                         info[2] = size / (info[0] * info[1]);
2341                         if (info[2] >= 1024)
2342                                 info[2] = 1023;
2343                 }
2344         }
2345         return 0;
2346 }
2347
2348 /* calculate percentage of total accesses on a ldn */
2349 static int ldn_access_load(int host_index, int ldn)
2350 {
2351         if (IBM_DS(host_index).total_accesses == 0)
2352                 return (0);
2353         if (IBM_DS(host_index).ldn_access[ldn] == 0)
2354                 return (0);
2355         return (IBM_DS(host_index).ldn_access[ldn] * 100) / IBM_DS(host_index).total_accesses;
2356 }
2357
2358 /* calculate total amount of r/w-accesses */
2359 static int ldn_access_total_read_write(int host_index)
2360 {
2361         int a;
2362         int i;
2363
2364         a = 0;
2365         for (i = 0; i <= MAX_LOG_DEV; i++)
2366                 a += IBM_DS(host_index).ldn_read_access[i] + IBM_DS(host_index).ldn_write_access[i];
2367         return (a);
2368 }
2369
2370 static int ldn_access_total_inquiry(int host_index)
2371 {
2372         int a;
2373         int i;
2374
2375         a = 0;
2376         for (i = 0; i <= MAX_LOG_DEV; i++)
2377                 a += IBM_DS(host_index).ldn_inquiry_access[i];
2378         return (a);
2379 }
2380
2381 static int ldn_access_total_modeselect(int host_index)
2382 {
2383         int a;
2384         int i;
2385
2386         a = 0;
2387         for (i = 0; i <= MAX_LOG_DEV; i++)
2388                 a += IBM_DS(host_index).ldn_modeselect_access[i];
2389         return (a);
2390 }
2391
2392 /* routine to display info in the proc-fs-structure (a deluxe feature) */
2393 static int ibmmca_proc_info(struct Scsi_Host *shpnt, char *buffer, char **start, off_t offset, int length, int inout)
2394 {
2395         int len = 0;
2396         int i, id, lun, host_index;
2397         unsigned long flags;
2398         int max_pun;
2399
2400         for (i = 0; hosts[i] && hosts[i] != shpnt; i++);
2401
2402         spin_lock_irqsave(hosts[i]->host_lock, flags);  /* Check it */
2403         host_index = i;
2404         if (!shpnt) {
2405                 len += sprintf(buffer + len, "\nIBM MCA SCSI: Can't find adapter for host number %d\n",
2406                                 shpnt->host_no);
2407                 return len;
2408         }
2409         max_pun = subsystem_maxid(host_index);
2410
2411         len += sprintf(buffer + len, "\n             IBM-SCSI-Subsystem-Linux-Driver, Version %s\n\n\n", IBMMCA_SCSI_DRIVER_VERSION);
2412         len += sprintf(buffer + len, " SCSI Access-Statistics:\n");
2413         len += sprintf(buffer + len, "               Device Scanning Order....: %s\n", (ibm_ansi_order) ? "IBM/ANSI" : "New Industry Standard");
2414 #ifdef CONFIG_SCSI_MULTI_LUN
2415         len += sprintf(buffer + len, "               Multiple LUN probing.....: Yes\n");
2416 #else
2417         len += sprintf(buffer + len, "               Multiple LUN probing.....: No\n");
2418 #endif
2419         len += sprintf(buffer + len, "               This Hostnumber..........: %d\n", shpnt->host_no);
2420         len += sprintf(buffer + len, "               Base I/O-Port............: 0x%x\n", (unsigned int) (IM_CMD_REG(host_index)));
2421         len += sprintf(buffer + len, "               (Shared) IRQ.............: %d\n", IM_IRQ);
2422         len += sprintf(buffer + len, "               Total Interrupts.........: %d\n", IBM_DS(host_index).total_interrupts);
2423         len += sprintf(buffer + len, "               Total SCSI Accesses......: %d\n", IBM_DS(host_index).total_accesses);
2424         len += sprintf(buffer + len, "               Total short SCBs.........: %d\n", IBM_DS(host_index).scbs);
2425         len += sprintf(buffer + len, "               Total long SCBs..........: %d\n", IBM_DS(host_index).long_scbs);
2426         len += sprintf(buffer + len, "                 Total SCSI READ/WRITE..: %d\n", ldn_access_total_read_write(host_index));
2427         len += sprintf(buffer + len, "                 Total SCSI Inquiries...: %d\n", ldn_access_total_inquiry(host_index));
2428         len += sprintf(buffer + len, "                 Total SCSI Modeselects.: %d\n", ldn_access_total_modeselect(host_index));
2429         len += sprintf(buffer + len, "                 Total SCSI other cmds..: %d\n", IBM_DS(host_index).total_accesses - ldn_access_total_read_write(host_index)
2430                        - ldn_access_total_modeselect(host_index)
2431                        - ldn_access_total_inquiry(host_index));
2432         len += sprintf(buffer + len, "               Total SCSI command fails.: %d\n\n", IBM_DS(host_index).total_errors);
2433         len += sprintf(buffer + len, " Logical-Device-Number (LDN) Access-Statistics:\n");
2434         len += sprintf(buffer + len, "         LDN | Accesses [%%] |   READ    |   WRITE   | ASSIGNMENTS\n");
2435         len += sprintf(buffer + len, "        -----|--------------|-----------|-----------|--------------\n");
2436         for (i = 0; i <= MAX_LOG_DEV; i++)
2437                 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]);
2438         len += sprintf(buffer + len, "        -----------------------------------------------------------\n\n");
2439         len += sprintf(buffer + len, " Dynamical-LDN-Assignment-Statistics:\n");
2440         len += sprintf(buffer + len, "               Number of physical SCSI-devices..: %d (+ Adapter)\n", IBM_DS(host_index).total_scsi_devices);
2441         len += sprintf(buffer + len, "               Dynamical Assignment necessary...: %s\n", IBM_DS(host_index).dyn_flag ? "Yes" : "No ");
2442         len += sprintf(buffer + len, "               Next LDN to be assigned..........: 0x%x\n", next_ldn(host_index));
2443         len += sprintf(buffer + len, "               Dynamical assignments done yet...: %d\n", IBM_DS(host_index).dynamical_assignments);
2444         len += sprintf(buffer + len, "\n Current SCSI-Device-Mapping:\n");
2445         len += sprintf(buffer + len, "        Physical SCSI-Device Map               Logical SCSI-Device Map\n");
2446         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");
2447         for (id = 0; id < max_pun; id++) {
2448                 len += sprintf(buffer + len, "    %2d     ", id);
2449                 for (lun = 0; lun < 8; lun++)
2450                         len += sprintf(buffer + len, "%2s ", ti_p(get_scsi(host_index)[id][lun]));
2451                 len += sprintf(buffer + len, "      %2d     ", id);
2452                 for (lun = 0; lun < 8; lun++)
2453                         len += sprintf(buffer + len, "%2s ", ti_l(get_ldn(host_index)[id][lun]));
2454                 len += sprintf(buffer + len, "\n");
2455         }
2456
2457         len += sprintf(buffer + len, "(A = IBM-Subsystem, D = Harddisk, T = Tapedrive, P = Processor, W = WORM,\n");
2458         len += sprintf(buffer + len, " R = CD-ROM, S = Scanner, M = MO-Drive, C = Medium-Changer, + = unprovided LUN,\n");
2459         len += sprintf(buffer + len, " - = nothing found, nothing assigned or unprobed LUN)\n\n");
2460
2461         *start = buffer + offset;
2462         len -= offset;
2463         if (len > length)
2464                 len = length;
2465         spin_unlock_irqrestore(shpnt->host_lock, flags);
2466         return len;
2467 }
2468
2469 static int option_setup(char *str)
2470 {
2471         int ints[IM_MAX_HOSTS];
2472         char *cur = str;
2473         int i = 1;
2474
2475         while (cur && isdigit(*cur) && i <= IM_MAX_HOSTS) {
2476                 ints[i++] = simple_strtoul(cur, NULL, 0);
2477                 if ((cur = strchr(cur, ',')) != NULL)
2478                         cur++;
2479         }
2480         ints[0] = i - 1;
2481         internal_ibmmca_scsi_setup(cur, ints);
2482         return 0;
2483 }
2484
2485 __setup("ibmmcascsi=", option_setup);
2486
2487 static Scsi_Host_Template driver_template = {
2488           .proc_name      = "ibmmca",
2489           .proc_info      = ibmmca_proc_info,
2490           .name           = "IBM SCSI-Subsystem",
2491           .detect         = ibmmca_detect,
2492           .release        = ibmmca_release,
2493           .queuecommand   = ibmmca_queuecommand,
2494           .eh_abort_handler = ibmmca_abort,
2495           .eh_host_reset_handler = ibmmca_host_reset,
2496           .bios_param     = ibmmca_biosparam,
2497           .can_queue      = 16,
2498           .this_id        = 7,
2499           .sg_tablesize   = 16,
2500           .cmd_per_lun    = 1,
2501           .use_clustering = ENABLE_CLUSTERING,
2502 };
2503 #include "scsi_module.c"