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