drivers/scsi/hosts.c

/* */
This source file includes following definitions.
scsi_unregister
scsi_register
scsi_register_device
scsi_init
   1 /*
   2  *  hosts.c Copyright (C) 1992 Drew Eckhardt
   3  *          Copyright (C) 1993, 1994, 1995 Eric Youngdale
   4  *
   5  *  mid to lowlevel SCSI driver interface
   6  *      Initial versions: Drew Eckhardt
   7  *      Subsequent revisions: Eric Youngdale
   8  *
   9  *  <drew@colorado.edu>
  10  */
  11 
  12 
  13 /*
  14  *  This file contains the medium level SCSI
  15  *  host interface initialization, as well as the scsi_hosts array of SCSI
  16  *  hosts currently present in the system.
  17  */
  18 
  19 /*
  20  * Don't import our own symbols, as this would severely mess up our
  21  * symbol tables.
  22  */
  23 #define _SCSI_SYMS_VER_
  24 #define __NO_VERSION__
  25 #include <linux/module.h>
  26 
  27 #include <linux/config.h>
  28 #include <linux/blk.h>
  29 #include <linux/kernel.h>
  30 #include <linux/string.h>
  31 #include <linux/mm.h>
  32 #include <linux/proc_fs.h>
  33 
  34 #include "scsi.h"
  35 
  36 #ifndef NULL
  37 #define NULL 0L
  38 #endif
  39 
  40 #define HOSTS_C
  41 
  42 #include "hosts.h"
  43 
  44 #ifdef CONFIG_SCSI_ADVANSYS
  45 #include "advansys.h"
  46 #endif
  47 
  48 #ifdef CONFIG_SCSI_AHA152X
  49 #include "aha152x.h"
  50 #endif
  51 
  52 #ifdef CONFIG_SCSI_AHA1542
  53 #include "aha1542.h"
  54 #endif
  55 
  56 #ifdef CONFIG_SCSI_AHA1740
  57 #include "aha1740.h"
  58 #endif
  59 
  60 #ifdef CONFIG_SCSI_AIC7XXX
  61 #include "aic7xxx.h"
  62 #endif
  63 
  64 #ifdef CONFIG_SCSI_BUSLOGIC
  65 #include "BusLogic.h"
  66 #endif
  67 
  68 #ifdef CONFIG_SCSI_EATA_DMA
  69 #include "eata_dma.h"
  70 #endif
  71 
  72 #ifdef CONFIG_SCSI_EATA_PIO
  73 #include "eata_pio.h"
  74 #endif
  75 
  76 #ifdef CONFIG_SCSI_U14_34F
  77 #include "u14-34f.h"
  78 #endif
  79 
  80 #ifdef CONFIG_SCSI_FUTURE_DOMAIN
  81 #include "fdomain.h"
  82 #endif
  83 
  84 #ifdef CONFIG_SCSI_GENERIC_NCR5380
  85 #include "g_NCR5380.h"
  86 #endif
  87 
  88 #ifdef CONFIG_SCSI_IN2000
  89 #include "in2000.h"
  90 #endif
  91 
  92 #ifdef CONFIG_SCSI_PAS16
  93 #include "pas16.h"
  94 #endif
  95 
  96 #ifdef CONFIG_SCSI_QLOGIC
  97 #include "qlogic.h"
  98 #endif
  99 
 100 #ifdef CONFIG_SCSI_SEAGATE
 101 #include "seagate.h"
 102 #endif
 103 
 104 #ifdef CONFIG_SCSI_T128
 105 #include "t128.h"
 106 #endif
 107 
 108 #ifdef CONFIG_SCSI_NCR53C7xx
 109 #include "53c7,8xx.h"
 110 #endif
 111 
 112 #ifdef CONFIG_SCSI_ULTRASTOR
 113 #include "ultrastor.h"
 114 #endif
 115 
 116 #ifdef CONFIG_SCSI_7000FASST
 117 #include "wd7000.h"
 118 #endif
 119 
 120 #ifdef CONFIG_SCSI_EATA
 121 #include "eata.h"
 122 #endif
 123 
 124 #ifdef CONFIG_SCSI_NCR53C406A
 125 #include "NCR53c406a.h"
 126 #endif
 127 
 128 #ifdef CONFIG_SCSI_AM53C974
 129 #include "AM53C974.h"
 130 #endif
 131 
 132 #ifdef CONFIG_SCSI_DEBUG
 133 #include "scsi_debug.h"
 134 #endif
 135 
 136 /*
 137 static const char RCSid[] = "$Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/hosts.c,v 1.3 1993/09/24 12:21:00 drew Exp drew $";
 138 */
 139 
 140 /*
 141  *  The scsi host entries should be in the order you wish the
 142  *  cards to be detected.  A driver may appear more than once IFF
 143  *  it can deal with being detected (and therefore initialized)
 144  *  with more than one simultaneous host number, can handle being
 145  *  reentrant, etc.
 146  *
 147  *  They may appear in any order, as each SCSI host is told which host 
 148  *  number it is during detection.
 149  */
 150 
 151 /* This is a placeholder for controllers that are not configured into
 152  * the system - we do this to ensure that the controller numbering is
 153  * always consistent, no matter how the kernel is configured. */
 154 
 155 #define NO_CONTROLLER {NULL, NULL, NULL, NULL, NULL, NULL, NULL, \
 156                            NULL, NULL, 0, 0, 0, 0, 0, 0}
 157 
 158 /*
 159  *  When figure is run, we don't want to link to any object code.  Since
 160  *  the macro for each host will contain function pointers, we cannot
 161  *  use it and instead must use a "blank" that does no such
 162  *  idiocy.
 163  */
 164 
 165 Scsi_Host_Template * scsi_hosts = NULL;
 166 
 167 static Scsi_Host_Template builtin_scsi_hosts[] =
 168 {
 169 #ifdef CONFIG_SCSI_ADVANSYS
 170         ADVANSYS,
 171 #endif
 172 /* BusLogic must come before aha1542.c */
 173 #ifdef CONFIG_SCSI_BUSLOGIC
 174     BUSLOGIC,
 175 #endif
 176 #ifdef CONFIG_SCSI_U14_34F
 177     ULTRASTOR_14_34F,
 178 #endif
 179 #ifdef CONFIG_SCSI_ULTRASTOR
 180     ULTRASTOR_14F,
 181 #endif
 182 #ifdef CONFIG_SCSI_AHA152X
 183     AHA152X,
 184 #endif
 185 #ifdef CONFIG_SCSI_AHA1542
 186     AHA1542,
 187 #endif
 188 #ifdef CONFIG_SCSI_AHA1740
 189     AHA1740,
 190 #endif
 191 #ifdef CONFIG_SCSI_AIC7XXX
 192     AIC7XXX,
 193 #endif
 194 #ifdef CONFIG_SCSI_FUTURE_DOMAIN
 195     FDOMAIN_16X0,
 196 #endif
 197 #ifdef CONFIG_SCSI_IN2000
 198     IN2000,
 199 #endif
 200 #ifdef CONFIG_SCSI_GENERIC_NCR5380
 201     GENERIC_NCR5380,
 202 #endif
 203 #ifdef CONFIG_SCSI_NCR53C406A   /* 53C406A should come before QLOGIC */
 204     NCR53c406a,
 205 #endif
 206 #ifdef CONFIG_SCSI_QLOGIC
 207     QLOGIC,
 208 #endif
 209 #ifdef CONFIG_SCSI_PAS16
 210     MV_PAS16,
 211 #endif
 212 #ifdef CONFIG_SCSI_SEAGATE
 213     SEAGATE_ST0X,
 214 #endif
 215 #ifdef CONFIG_SCSI_T128
 216     TRANTOR_T128,
 217 #endif
 218 #ifdef CONFIG_SCSI_NCR53C7xx
 219     NCR53c7xx,
 220 #endif
 221 #ifdef CONFIG_SCSI_EATA_DMA
 222     EATA_DMA,
 223 #endif
 224 #ifdef CONFIG_SCSI_EATA_PIO
 225     EATA_PIO,
 226 #endif
 227 #ifdef CONFIG_SCSI_7000FASST
 228     WD7000,
 229 #endif
 230 #ifdef CONFIG_SCSI_EATA
 231     EATA,
 232 #endif
 233 #ifdef CONFIG_SCSI_AM53C974
 234     AM53C974,
 235 #endif
 236 #ifdef CONFIG_SCSI_DEBUG
 237     SCSI_DEBUG,
 238 #endif
 239 };
 240 
 241 #define MAX_SCSI_HOSTS (sizeof(builtin_scsi_hosts) / sizeof(Scsi_Host_Template))
 242 
 243 
 244 /*
 245  *  Our semaphores and timeout counters, where size depends on 
 246  *      MAX_SCSI_HOSTS here.
 247  */
 248 
 249 struct Scsi_Host * scsi_hostlist = NULL;
 250 struct Scsi_Device_Template * scsi_devicelist = NULL;
 251 
 252 int max_scsi_hosts = 0;
 253 int next_scsi_host = 0;
 254 
 255 void
 256 scsi_unregister(struct Scsi_Host * sh){
     /*  */
 257     struct Scsi_Host * shpnt;
 258     
 259     if(scsi_hostlist == sh)
 260         scsi_hostlist = sh->next;
 261     else {
 262         shpnt = scsi_hostlist;
 263         while(shpnt->next != sh) shpnt = shpnt->next;
 264         shpnt->next = shpnt->next->next;
 265     }
 266     
 267     /* If we are removing the last host registered, it is safe to reuse
 268      * its host number (this avoids "holes" at boot time) (DB) 
 269      */
 270     if (max_scsi_hosts == next_scsi_host && !scsi_loadable_module_flag)
 271         max_scsi_hosts--;
 272     
 273     next_scsi_host--;
 274     scsi_init_free((char *) sh, sizeof(struct Scsi_Host) + sh->extra_bytes);
 275 }
 276 
 277 /* We call this when we come across a new host adapter. We only do this
 278  * once we are 100% sure that we want to use this host adapter -  it is a
 279  * pain to reverse this, so we try and avoid it 
 280  */
 281 
 282 struct Scsi_Host * scsi_register(Scsi_Host_Template * tpnt, int j){
     /*  */
 283     struct Scsi_Host * retval, *shpnt;
 284     retval = (struct Scsi_Host *)scsi_init_malloc(sizeof(struct Scsi_Host) + j,
 285                                                   (tpnt->unchecked_isa_dma && j ? GFP_DMA : 0) | GFP_ATOMIC);
 286     retval->host_busy = 0;
 287     retval->block = NULL;
 288     retval->wish_block = 0;
 289     if(j > 0xffff) panic("Too many extra bytes requested\n");
 290     retval->extra_bytes = j;
 291     retval->loaded_as_module = scsi_loadable_module_flag;
 292     retval->host_no = max_scsi_hosts++; /* never reuse host_no (DB) */
 293     next_scsi_host++;
 294     retval->host_queue = NULL;
 295     retval->host_wait = NULL;
 296     retval->last_reset = 0;
 297     retval->irq = 0;
 298     retval->dma_channel = 0xff;
 299 
 300     /* These three are default values which can be overridden */
 301     retval->max_channel = 0; 
 302     retval->max_id = 8;      
 303     retval->max_lun = 8;
 304 
 305     retval->unique_id = 0;
 306     retval->io_port = 0;
 307     retval->hostt = tpnt;
 308     retval->next = NULL;
 309 #ifdef DEBUG
 310     printk("Register %x %x: %d\n", (int)retval, (int)retval->hostt, j);
 311 #endif
 312 
 313     /* The next six are the default values which can be overridden
 314      * if need be */
 315     retval->this_id = tpnt->this_id;
 316     retval->can_queue = tpnt->can_queue;
 317     retval->sg_tablesize = tpnt->sg_tablesize;
 318     retval->cmd_per_lun = tpnt->cmd_per_lun;
 319     retval->unchecked_isa_dma = tpnt->unchecked_isa_dma;
 320     retval->use_clustering = tpnt->use_clustering;   
 321     if(!scsi_hostlist)
 322         scsi_hostlist = retval;
 323     else
 324     {
 325         shpnt = scsi_hostlist;
 326         while(shpnt->next) shpnt = shpnt->next;
 327         shpnt->next = retval;
 328     }
 329     
 330     return retval;
 331 }
 332 
 333 int
 334 scsi_register_device(struct Scsi_Device_Template * sdpnt)
     /*  */
 335 {
 336     if(sdpnt->next) panic("Device already registered");
 337     sdpnt->next = scsi_devicelist;
 338     scsi_devicelist = sdpnt;
 339     return 0;
 340 }
 341 
 342 unsigned int scsi_init()
     /*  */
 343 {
 344     static int called = 0;
 345     int i, pcount;
 346     Scsi_Host_Template * tpnt;
 347     struct Scsi_Host * shpnt;
 348     const char * name;
 349     
 350     if(called) return 0;
 351     
 352     called = 1;
 353     for (tpnt = &builtin_scsi_hosts[0], i = 0; i < MAX_SCSI_HOSTS; ++i, tpnt++)
 354     {
 355         /*
 356          * Initialize our semaphores.  -1 is interpreted to mean
 357          * "inactive" - where as 0 will indicate a time out condition.
 358          */
 359         
 360         pcount = next_scsi_host;
 361         if ((tpnt->detect) &&
 362             (tpnt->present =
 363              tpnt->detect(tpnt)))
 364         {
 365             /* The only time this should come up is when people use
 366              * some kind of patched driver of some kind or another. */
 367             if(pcount == next_scsi_host) {
 368                 if(tpnt->present > 1)
 369                     panic("Failure to register low-level scsi driver");
 370                 /* The low-level driver failed to register a driver.  We
 371                  * can do this now. */
 372                 scsi_register(tpnt,0);
 373             }
 374             tpnt->next = scsi_hosts;
 375             scsi_hosts = tpnt;
 376 
 377             /* Add the driver to /proc/scsi */
 378 #if CONFIG_PROC_FS 
 379             build_proc_dir_entries(tpnt);    
 380 #endif
 381         }
 382     }
 383         
 384     for(shpnt=scsi_hostlist; shpnt; shpnt = shpnt->next)
 385     {
 386         if(shpnt->hostt->info)
 387             name = shpnt->hostt->info(shpnt);
 388         else
 389             name = shpnt->hostt->name;
 390         printk ("scsi%d : %s\n", /* And print a little message */
 391                 shpnt->host_no, name);
 392     }
 393     
 394     printk ("scsi : %d host%s.\n", next_scsi_host,
 395             (next_scsi_host == 1) ? "" : "s");
 396     
 397     scsi_make_blocked_list();
 398     
 399     /* Now attach the high level drivers */
 400 #ifdef CONFIG_BLK_DEV_SD
 401     scsi_register_device(&sd_template);
 402 #endif
 403 #ifdef CONFIG_BLK_DEV_SR
 404     scsi_register_device(&sr_template);
 405 #endif
 406 #ifdef CONFIG_CHR_DEV_ST
 407     scsi_register_device(&st_template);
 408 #endif
 409 #ifdef CONFIG_CHR_DEV_SG
 410     scsi_register_device(&sg_template);
 411 #endif
 412     
 413 #if 0      
 414     max_scsi_hosts = next_scsi_host;
 415 #endif
 416     return 0;
 417 }
 418 
 419 /*
 420  * Overrides for Emacs so that we follow Linus's tabbing style.
 421  * Emacs will notice this stuff at the end of the file and automatically
 422  * adjust the settings for this buffer only.  This must remain at the end
 423  * of the file.
 424  * ---------------------------------------------------------------------------
 425  * Local variables:
 426  * c-indent-level: 4
 427  * c-brace-imaginary-offset: 0
 428  * c-brace-offset: -4
 429  * c-argdecl-indent: 4
 430  * c-label-offset: -4
 431  * c-continued-statement-offset: 4
 432  * c-continued-brace-offset: 0
 433  * indent-tabs-mode: nil
 434  * tab-width: 8
 435  * End:
 436  */
/* */
root/drivers/scsi/hosts.c

DEFINITIONS
