root/drivers/scsi/hosts.c

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DEFINITIONS

This source file includes following definitions.
  1. scsi_unregister
  2. scsi_register
  3. scsi_register_device
  4. scsi_init

   1 /*
   2  *      hosts.c Copyright (C) 1992 Drew Eckhardt 
   3  *      mid to lowlevel SCSI driver interface by
   4  *              Drew Eckhardt 
   5  *
   6  *      <drew@colorado.edu>
   7  */
   8 
   9 
  10 /*
  11  *      This file contains the medium level SCSI
  12  *      host interface initialization, as well as the scsi_hosts array of SCSI
  13  *      hosts currently present in the system. 
  14  */
  15 
  16 #include <linux/config.h>
  17 #include "../block/blk.h"
  18 #include <linux/kernel.h>
  19 #include <linux/string.h>
  20 #include "scsi.h"
  21 
  22 #ifndef NULL 
  23 #define NULL 0L
  24 #endif
  25 
  26 #define HOSTS_C
  27 
  28 #include "hosts.h"
  29 
  30 #ifdef CONFIG_SCSI_AHA152X
  31 #include "aha152x.h"
  32 #endif
  33 
  34 #ifdef CONFIG_SCSI_AHA1542
  35 #include "aha1542.h"
  36 #endif
  37 
  38 #ifdef CONFIG_SCSI_AHA1740
  39 #include "aha1740.h"
  40 #endif
  41 
  42 #ifdef CONFIG_SCSI_AHA274X
  43 #include "aha274x.h"
  44 #endif
  45 
  46 #ifdef CONFIG_SCSI_BUSLOGIC
  47 #include "buslogic.h"
  48 #endif
  49 
  50 #ifdef CONFIG_SCSI_U14_34F
  51 #include "u14-34f.h"
  52 #endif
  53  
  54 #ifdef CONFIG_SCSI_FUTURE_DOMAIN
  55 #include "fdomain.h"
  56 #endif
  57 
  58 #ifdef CONFIG_SCSI_GENERIC_NCR5380
  59 #include "g_NCR5380.h"
  60 #endif
  61 
  62 #ifdef CONFIG_SCSI_IN2000
  63 #include "in2000.h"
  64 #endif
  65 
  66 #ifdef CONFIG_SCSI_PAS16
  67 #include "pas16.h"
  68 #endif
  69 
  70 #ifdef CONFIG_SCSI_SEAGATE
  71 #include "seagate.h"
  72 #endif
  73 
  74 #ifdef CONFIG_SCSI_T128
  75 #include "t128.h"
  76 #endif
  77 
  78 #ifdef CONFIG_SCSI_NCR53C7xx
  79 #include "53c7,8xx.h"
  80 #endif
  81 
  82 #ifdef CONFIG_SCSI_ULTRASTOR
  83 #include "ultrastor.h"
  84 #endif
  85 
  86 #ifdef CONFIG_SCSI_7000FASST
  87 #include "wd7000.h"
  88 #endif
  89 
  90 #ifdef CONFIG_SCSI_EATA
  91 #include "eata.h"
  92 #endif
  93  
  94 #ifdef CONFIG_SCSI_DEBUG
  95 #include "scsi_debug.h"
  96 #endif
  97 
  98 /*
  99 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 $";
 100 */
 101 
 102 /*
 103  *      The scsi host entries should be in the order you wish the 
 104  *      cards to be detected.  A driver may appear more than once IFF
 105  *      it can deal with being detected (and therefore initialized) 
 106  *      with more than one simultaneous host number, can handle being
 107  *      reentrant, etc.
 108  *
 109  *      They may appear in any order, as each SCSI host  is told which host number it is
 110  *      during detection.
 111  */
 112 
 113 /* This is a placeholder for controllers that are not configured into
 114    the system - we do this to ensure that the controller numbering is
 115    always consistent, no matter how the kernel is configured. */
 116 
 117 #define NO_CONTROLLER {NULL, NULL, NULL, NULL, NULL, NULL, NULL, \
 118                 NULL, NULL, 0, 0, 0, 0, 0, 0}
 119 
 120 /*
 121  *      When figure is run, we don't want to link to any object code.  Since 
 122  *      the macro for each host will contain function pointers, we cannot 
 123  *      use it and instead must use a "blank" that does no such 
 124  *      idiocy.
 125  */
 126 
 127 Scsi_Host_Template * scsi_hosts = NULL;
 128 
 129 static Scsi_Host_Template builtin_scsi_hosts[] =
 130         {
 131 #ifdef CONFIG_SCSI_U14_34F
 132         ULTRASTOR_14_34F,
 133 #endif
 134 #ifdef CONFIG_SCSI_ULTRASTOR
 135         ULTRASTOR_14F,
 136 #endif
 137 #ifdef CONFIG_SCSI_AHA152X
 138         AHA152X,
 139 #endif
 140 /* Buslogic must come before aha1542.c */
 141 #ifdef CONFIG_SCSI_BUSLOGIC
 142         BUSLOGIC,
 143 #endif
 144 #ifdef CONFIG_SCSI_AHA1542
 145         AHA1542,
 146 #endif
 147 #ifdef CONFIG_SCSI_AHA1740
 148         AHA1740,
 149 #endif
 150 #ifdef CONFIG_SCSI_AHA274X
 151         AHA274X,
 152 #endif
 153 #ifdef CONFIG_SCSI_FUTURE_DOMAIN
 154         FDOMAIN_16X0,
 155 #endif
 156 #ifdef CONFIG_SCSI_IN2000
 157         IN2000,
 158 #endif
 159 #ifdef CONFIG_SCSI_GENERIC_NCR5380
 160         GENERIC_NCR5380,
 161 #endif
 162 #ifdef CONFIG_SCSI_PAS16
 163         MV_PAS16,
 164 #endif
 165 #ifdef CONFIG_SCSI_SEAGATE
 166         SEAGATE_ST0X,
 167 #endif
 168 #ifdef CONFIG_SCSI_T128
 169         TRANTOR_T128,
 170 #endif
 171 #ifdef CONFIG_SCSI_NCR53C7xx
 172         NCR53c7xx,
 173 #endif
 174 #ifdef CONFIG_SCSI_7000FASST
 175         WD7000,
 176 #endif
 177 #ifdef CONFIG_SCSI_EATA
 178         EATA,
 179 #endif
 180 #ifdef CONFIG_SCSI_DEBUG
 181         SCSI_DEBUG,
 182 #endif
 183         };
 184 
 185 #define MAX_SCSI_HOSTS (sizeof(builtin_scsi_hosts) / sizeof(Scsi_Host_Template))
 186 
 187 /*
 188  *      Our semaphores and timeout counters, where size depends on MAX_SCSI_HOSTS here. 
 189  */
 190 
 191 struct Scsi_Host * scsi_hostlist = NULL;
 192 struct Scsi_Device_Template * scsi_devicelist;
 193 
 194 int max_scsi_hosts = 0;
 195 static int next_host = 0;
 196 
 197 void
 198 scsi_unregister(struct Scsi_Host * sh){
     /* [previous][next][first][last][top][bottom][index][help] */
 199         struct Scsi_Host * shpnt;
 200         int j;
 201 
 202         j = sh->extra_bytes;
 203 
 204         if(scsi_hostlist == sh)
 205                 scsi_hostlist = NULL;
 206         else {
 207                 shpnt = scsi_hostlist;
 208                 while(shpnt->next != sh) shpnt = shpnt->next;
 209                 shpnt->next = shpnt->next->next;
 210         };
 211         next_host--;
 212         scsi_init_free((char *) sh, sizeof(struct Scsi_Host) + j);
 213 }
 214 
 215 /* We call this when we come across a new host adapter. We only do this
 216    once we are 100% sure that we want to use this host adapter -  it is a
 217    pain to reverse this, so we try and avoid it */
 218 
 219 struct Scsi_Host * scsi_register(Scsi_Host_Template * tpnt, int j){
     /* [previous][next][first][last][top][bottom][index][help] */
 220         struct Scsi_Host * retval, *shpnt;
 221         retval = (struct Scsi_Host *)scsi_init_malloc(sizeof(struct Scsi_Host) + j);
 222         retval->host_busy = 0;
 223         if(j > 0xffff) panic("Too many extra bytes requested\n");
 224         retval->extra_bytes = j;
 225         retval->loaded_as_module = scsi_loadable_module_flag;
 226         retval->host_no = next_host++;
 227         retval->host_queue = NULL;      
 228         retval->host_wait = NULL;       
 229         retval->last_reset = 0; 
 230         retval->irq = 0;
 231         retval->hostt = tpnt;   
 232         retval->next = NULL;
 233 #ifdef DEBUG
 234         printk("Register %x %x: %d\n", retval, retval->hostt, j);
 235 #endif
 236 
 237         /* The next four are the default values which can be overridden
 238            if need be */
 239         retval->this_id = tpnt->this_id;
 240         retval->can_queue = tpnt->can_queue;
 241         retval->sg_tablesize = tpnt->sg_tablesize;
 242         retval->unchecked_isa_dma = tpnt->unchecked_isa_dma;
 243 
 244         if(!scsi_hostlist)
 245                 scsi_hostlist = retval;
 246         else
 247         {
 248                 shpnt = scsi_hostlist;
 249                 while(shpnt->next) shpnt = shpnt->next;
 250                 shpnt->next = retval;
 251         }
 252 
 253         return retval;
 254 }
 255 
 256 int
 257 scsi_register_device(struct Scsi_Device_Template * sdpnt)
     /* [previous][next][first][last][top][bottom][index][help] */
 258 {
 259   if(sdpnt->next) panic("Device already registered");
 260   sdpnt->next = scsi_devicelist;
 261   scsi_devicelist = sdpnt;
 262   return 0;
 263 }
 264 
 265 unsigned int scsi_init()
     /* [previous][next][first][last][top][bottom][index][help] */
 266 {
 267         static int called = 0;
 268         int i, j, count, pcount;
 269         Scsi_Host_Template * tpnt;
 270         count = 0;
 271 
 272         if(called) return 0;
 273 
 274         called = 1;     
 275         for (tpnt = &builtin_scsi_hosts[0], i = 0; i < MAX_SCSI_HOSTS; ++i, tpnt++)
 276         {
 277                 /*
 278                  * Initialize our semaphores.  -1 is interpreted to mean 
 279                  * "inactive" - where as 0 will indicate a time out condition.
 280                  */ 
 281                 
 282                 pcount = next_host;
 283                 if ((tpnt->detect) && 
 284                     (tpnt->present = 
 285                      tpnt->detect(tpnt)))
 286                 {               
 287                         /* The only time this should come up is when people use
 288                            some kind of patched driver of some kind or another. */
 289                         if(pcount == next_host) {
 290                                 if(tpnt->present > 1)
 291                                         panic("Failure to register low-level scsi driver");
 292                                 /* The low-level driver failed to register a driver.  We
 293                                    can do this now. */
 294                                 scsi_register(tpnt,0);
 295                         };
 296                         tpnt->next = scsi_hosts;
 297                         scsi_hosts = tpnt;
 298                         for(j = 0; j < tpnt->present; j++)
 299                                 printk ("scsi%d : %s\n",
 300                                         count++, tpnt->name);
 301                 }
 302         }
 303         printk ("scsi : %d hosts.\n", count);
 304         
 305         /* Now attach the high level drivers */
 306 #ifdef CONFIG_BLK_DEV_SD
 307         scsi_register_device(&sd_template);
 308 #endif
 309 #ifdef CONFIG_BLK_DEV_SR
 310         scsi_register_device(&sr_template);
 311 #endif
 312 #ifdef CONFIG_CHR_DEV_ST
 313         scsi_register_device(&st_template);
 314 #endif
 315 #ifdef CONFIG_CHR_DEV_SG
 316         scsi_register_device(&sg_template);
 317 #endif
 318 
 319         max_scsi_hosts = count;
 320         return 0;
 321 }

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