drivers/scsi/hosts.c

/* */
This source file includes following definitions.
scsi_unregister
scsi_register
scsi_register_device
scsi_init
scsi_mem_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 #include <linux/config.h>
  20 #include "../block/blk.h"
  21 #include <linux/kernel.h>
  22 #include <linux/string.h>
  23 #include <linux/mm.h>
  24 
  25 #include "scsi.h"
  26 
  27 #ifndef NULL
  28 #define NULL 0L
  29 #endif
  30 
  31 #define HOSTS_C
  32 
  33 #include "hosts.h"
  34 
  35 #ifdef CONFIG_SCSI_AHA152X
  36 #include "aha152x.h"
  37 #endif
  38 
  39 #ifdef CONFIG_SCSI_AHA1542
  40 #include "aha1542.h"
  41 #endif
  42 
  43 #ifdef CONFIG_SCSI_AHA1740
  44 #include "aha1740.h"
  45 #endif
  46 
  47 #ifdef CONFIG_SCSI_AHA274X
  48 #include "aha274x.h"
  49 #endif
  50 
  51 #ifdef CONFIG_SCSI_BUSLOGIC
  52 #include "buslogic.h"
  53 #endif
  54 
  55 #ifdef CONFIG_SCSI_EATA_DMA
  56 #include "eata_dma.h"
  57 #endif
  58 
  59 #ifdef CONFIG_SCSI_U14_34F
  60 #include "u14-34f.h"
  61 #endif
  62 
  63 #ifdef CONFIG_SCSI_FUTURE_DOMAIN
  64 #include "fdomain.h"
  65 #endif
  66 
  67 #ifdef CONFIG_SCSI_GENERIC_NCR5380
  68 #include "g_NCR5380.h"
  69 #endif
  70 
  71 #ifdef CONFIG_SCSI_IN2000
  72 #include "in2000.h"
  73 #endif
  74 
  75 #ifdef CONFIG_SCSI_PAS16
  76 #include "pas16.h"
  77 #endif
  78 
  79 #ifdef CONFIG_SCSI_QLOGIC
  80 #include "qlogic.h"
  81 #endif
  82 
  83 #ifdef CONFIG_SCSI_SEAGATE
  84 #include "seagate.h"
  85 #endif
  86 
  87 #ifdef CONFIG_SCSI_T128
  88 #include "t128.h"
  89 #endif
  90 
  91 #ifdef CONFIG_SCSI_NCR53C7xx
  92 #include "53c7,8xx.h"
  93 #endif
  94 
  95 #ifdef CONFIG_SCSI_ULTRASTOR
  96 #include "ultrastor.h"
  97 #endif
  98 
  99 #ifdef CONFIG_SCSI_7000FASST
 100 #include "wd7000.h"
 101 #endif
 102 
 103 #ifdef CONFIG_SCSI_EATA
 104 #include "eata.h"
 105 #endif
 106 
 107 #ifdef CONFIG_SCSI_DEBUG
 108 #include "scsi_debug.h"
 109 #endif
 110 
 111 /*
 112 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 $";
 113 */
 114 
 115 /*
 116  *      The scsi host entries should be in the order you wish the
 117  *      cards to be detected.  A driver may appear more than once IFF
 118  *      it can deal with being detected (and therefore initialized)
 119  *      with more than one simultaneous host number, can handle being
 120  *      reentrant, etc.
 121  *
 122  *      They may appear in any order, as each SCSI host  is told which host number it is
 123  *      during detection.
 124  */
 125 
 126 /* This is a placeholder for controllers that are not configured into
 127    the system - we do this to ensure that the controller numbering is
 128    always consistent, no matter how the kernel is configured. */
 129 
 130 #define NO_CONTROLLER {NULL, NULL, NULL, NULL, NULL, NULL, NULL, \
 131                 NULL, NULL, 0, 0, 0, 0, 0, 0}
 132 
 133 /*
 134  *      When figure is run, we don't want to link to any object code.  Since
 135  *      the macro for each host will contain function pointers, we cannot
 136  *      use it and instead must use a "blank" that does no such
 137  *      idiocy.
 138  */
 139 
 140 Scsi_Host_Template * scsi_hosts = NULL;
 141 
 142 static Scsi_Host_Template builtin_scsi_hosts[] =
 143         {
 144 #ifdef CONFIG_SCSI_U14_34F
 145         ULTRASTOR_14_34F,
 146 #endif
 147 #ifdef CONFIG_SCSI_ULTRASTOR
 148         ULTRASTOR_14F,
 149 #endif
 150 #ifdef CONFIG_SCSI_AHA152X
 151         AHA152X,
 152 #endif
 153 /* Buslogic must come before aha1542.c */
 154 #ifdef CONFIG_SCSI_BUSLOGIC
 155         BUSLOGIC,
 156 #endif
 157 #ifdef CONFIG_SCSI_AHA1542
 158         AHA1542,
 159 #endif
 160 #ifdef CONFIG_SCSI_AHA1740
 161         AHA1740,
 162 #endif
 163 #ifdef CONFIG_SCSI_AHA274X
 164         AHA274X,
 165 #endif
 166 #ifdef CONFIG_SCSI_FUTURE_DOMAIN
 167         FDOMAIN_16X0,
 168 #endif
 169 #ifdef CONFIG_SCSI_IN2000
 170         IN2000,
 171 #endif
 172 #ifdef CONFIG_SCSI_GENERIC_NCR5380
 173         GENERIC_NCR5380,
 174 #endif
 175 #ifdef CONFIG_SCSI_QLOGIC
 176         QLOGIC,
 177 #endif
 178 #ifdef CONFIG_SCSI_PAS16
 179         MV_PAS16,
 180 #endif
 181 #ifdef CONFIG_SCSI_SEAGATE
 182         SEAGATE_ST0X,
 183 #endif
 184 #ifdef CONFIG_SCSI_T128
 185         TRANTOR_T128,
 186 #endif
 187 #ifdef CONFIG_SCSI_NCR53C7xx
 188         NCR53c7xx,
 189 #endif
 190 #ifdef CONFIG_SCSI_EATA_DMA
 191         EATA_DMA,
 192 #endif
 193 #ifdef CONFIG_SCSI_7000FASST
 194         WD7000,
 195 #endif
 196 #ifdef CONFIG_SCSI_EATA
 197         EATA,
 198 #endif
 199 #ifdef CONFIG_SCSI_DEBUG
 200         SCSI_DEBUG,
 201 #endif
 202         };
 203 
 204 #define MAX_SCSI_HOSTS (sizeof(builtin_scsi_hosts) / sizeof(Scsi_Host_Template))
 205 
 206 /*
 207  *      Our semaphores and timeout counters, where size depends on MAX_SCSI_HOSTS here.
 208  */
 209 
 210 struct Scsi_Host * scsi_hostlist = NULL;
 211 struct Scsi_Device_Template * scsi_devicelist;
 212 
 213 int max_scsi_hosts = 0;
 214 int next_scsi_host = 0;
 215 
 216 void
 217 scsi_unregister(struct Scsi_Host * sh){
     /*  */
 218         struct Scsi_Host * shpnt;
 219         int j;
 220 
 221         j = sh->extra_bytes;
 222 
 223         if(scsi_hostlist == sh)
 224                 scsi_hostlist = NULL;
 225         else {
 226                 shpnt = scsi_hostlist;
 227                 while(shpnt->next != sh) shpnt = shpnt->next;
 228                 shpnt->next = shpnt->next->next;
 229         };
 230         next_scsi_host--;
 231         scsi_init_free((char *) sh, sizeof(struct Scsi_Host) + j);
 232 }
 233 
 234 /* We call this when we come across a new host adapter. We only do this
 235    once we are 100% sure that we want to use this host adapter -  it is a
 236    pain to reverse this, so we try and avoid it */
 237 
 238 struct Scsi_Host * scsi_register(Scsi_Host_Template * tpnt, int j){
     /*  */
 239         struct Scsi_Host * retval, *shpnt;
 240         retval = (struct Scsi_Host *)scsi_init_malloc(sizeof(struct Scsi_Host) + j,
 241                                                       (tpnt->unchecked_isa_dma && j ? GFP_DMA : 0) | GFP_ATOMIC);
 242         retval->host_busy = 0;
 243         retval->block = NULL;
 244         if(j > 0xffff) panic("Too many extra bytes requested\n");
 245         retval->extra_bytes = j;
 246         retval->loaded_as_module = scsi_loadable_module_flag;
 247         retval->host_no = next_scsi_host++;
 248         retval->host_queue = NULL;
 249         retval->host_wait = NULL;
 250         retval->last_reset = 0;
 251         retval->irq = 0;
 252         retval->forbidden_addr = 0;
 253         retval->forbidden_size = 0;
 254         retval->hostt = tpnt;
 255         retval->next = NULL;
 256 #ifdef DEBUG
 257         printk("Register %x %x: %d\n", (int)retval, (int)retval->hostt, j);
 258 #endif
 259 
 260         /* The next four are the default values which can be overridden
 261            if need be */
 262         retval->this_id = tpnt->this_id;
 263         retval->can_queue = tpnt->can_queue;
 264         retval->sg_tablesize = tpnt->sg_tablesize;
 265         retval->cmd_per_lun = tpnt->cmd_per_lun;
 266         retval->unchecked_isa_dma = tpnt->unchecked_isa_dma;
 267 
 268         if(!scsi_hostlist)
 269                 scsi_hostlist = retval;
 270         else
 271         {
 272                 shpnt = scsi_hostlist;
 273                 while(shpnt->next) shpnt = shpnt->next;
 274                 shpnt->next = retval;
 275         }
 276 
 277         return retval;
 278 }
 279 
 280 int
 281 scsi_register_device(struct Scsi_Device_Template * sdpnt)
     /*  */
 282 {
 283   if(sdpnt->next) panic("Device already registered");
 284   sdpnt->next = scsi_devicelist;
 285   scsi_devicelist = sdpnt;
 286   return 0;
 287 }
 288 
 289 unsigned int scsi_init()
     /*  */
 290 {
 291         static int called = 0;
 292         int i, pcount;
 293         Scsi_Host_Template * tpnt;
 294         struct Scsi_Host * shpnt;
 295         const char * name;
 296 
 297         if(called) return 0;
 298 
 299         called = 1;
 300         for (tpnt = &builtin_scsi_hosts[0], i = 0; i < MAX_SCSI_HOSTS; ++i, tpnt++)
 301         {
 302                 /*
 303                  * Initialize our semaphores.  -1 is interpreted to mean
 304                  * "inactive" - where as 0 will indicate a time out condition.
 305                  */
 306 
 307                 pcount = next_scsi_host;
 308                 if ((tpnt->detect) &&
 309                     (tpnt->present =
 310                      tpnt->detect(tpnt)))
 311                 {
 312                         /* The only time this should come up is when people use
 313                            some kind of patched driver of some kind or another. */
 314                         if(pcount == next_scsi_host) {
 315                                 if(tpnt->present > 1)
 316                                         panic("Failure to register low-level scsi driver");
 317                                 /* The low-level driver failed to register a driver.  We
 318                                    can do this now. */
 319                                 scsi_register(tpnt,0);
 320                         };
 321                         tpnt->next = scsi_hosts;
 322                         scsi_hosts = tpnt;
 323                 }
 324         }
 325 
 326 
 327         for(shpnt=scsi_hostlist; shpnt; shpnt = shpnt->next)
 328             {
 329               if(shpnt->hostt->info)
 330                 name = shpnt->hostt->info(shpnt);
 331               else
 332                 name = shpnt->hostt->name;
 333               printk ("scsi%d : %s\n", /* And print a little message */
 334                       shpnt->host_no, name);
 335             }
 336 
 337         printk ("scsi : %d host%s.\n", next_scsi_host,
 338                 (next_scsi_host == 1) ? "" : "s");
 339 
 340       {
 341       int block_count = 0, index;
 342       struct Scsi_Host * sh[128], * shpnt;
 343 
 344          for(shpnt=scsi_hostlist; shpnt; shpnt = shpnt->next)
 345             if (shpnt->block) sh[block_count++] = shpnt;
 346       
 347          if (block_count == 1) sh[0]->block = NULL;
 348 
 349          else if (block_count > 1) {
 350 
 351             for(index = 0; index < block_count - 1; index++) {
 352                sh[index]->block = sh[index + 1];
 353                printk("scsi%d : added to blocked host list.\n", 
 354                       sh[index]->host_no);
 355                }
 356            
 357             sh[block_count - 1]->block = sh[0];
 358             printk("scsi%d : added to blocked host list.\n", 
 359                    sh[index]->host_no);
 360             }
 361 
 362       }
 363 
 364         /* Now attach the high level drivers */
 365 #ifdef CONFIG_BLK_DEV_SD
 366         scsi_register_device(&sd_template);
 367 #endif
 368 #ifdef CONFIG_BLK_DEV_SR
 369         scsi_register_device(&sr_template);
 370 #endif
 371 #ifdef CONFIG_CHR_DEV_ST
 372         scsi_register_device(&st_template);
 373 #endif
 374 #ifdef CONFIG_CHR_DEV_SG
 375         scsi_register_device(&sg_template);
 376 #endif
 377 
 378         max_scsi_hosts = next_scsi_host;
 379         return 0;
 380 }
 381 
 382 
 383 void scsi_mem_init(unsigned long memory_end)
     /*  */
 384 {
 385     struct Scsi_Host *Host;
 386     long High8, Low24;
 387     for (Host = scsi_hostlist; Host != NULL; Host = Host->next) {
 388         if (Host->forbidden_addr > 0 && Host->forbidden_size > 0) {
 389             for (High8 = 1<<24; High8 < memory_end; High8 += 1<<24) {
 390                 for (Low24 = Host->forbidden_addr;
 391                      Low24 < Host->forbidden_addr + Host->forbidden_size;
 392                      Low24 += PAGE_SIZE) {
 393                     unsigned long ForbiddenAddress = High8 + Low24;
 394                     if (ForbiddenAddress >= memory_end) goto next_host;
 395                     mem_map[MAP_NR(ForbiddenAddress)] = MAP_PAGE_RESERVED;
 396                 }
 397             }
 398         }
 399       next_host:
 400         continue;
 401     }
 402 }
/* */
root/drivers/scsi/hosts.c

DEFINITIONS
