drivers/eisa/eisa-bus.c

   1 /*
   2  * EISA bus support functions for sysfs.
   3  *
   4  * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
   5  *
   6  * This code is released under the GPL version 2.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/device.h>
  11 #include <linux/eisa.h>
  12 #include <linux/module.h>
  13 #include <linux/moduleparam.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/ioport.h>
  17 #include <asm/io.h>
  18
  19 #define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))
  20
  21 #define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }
  22
  23 struct eisa_device_info {
  24         struct eisa_device_id id;
  25         char name[DEVICE_NAME_SIZE];
  26 };
  27
  28 #ifdef CONFIG_EISA_NAMES
  29 static struct eisa_device_info __initdata eisa_table[] = {
  30 #include "devlist.h"
  31 };
  32 #define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
  33 #endif
  34
  35 #define EISA_MAX_FORCED_DEV 16
  36
  37 static int enable_dev[EISA_MAX_FORCED_DEV];
  38 static int enable_dev_count;
  39 static int disable_dev[EISA_MAX_FORCED_DEV];
  40 static int disable_dev_count;
  41
  42 static int is_forced_dev (int *forced_tab,
  43                           int forced_count,
  44                           struct eisa_root_device *root,
  45                           struct eisa_device *edev)
  46 {
  47         int i, x;
  48
  49         for (i = 0; i < forced_count; i++) {
  50                 x = (root->bus_nr << 8) | edev->slot;
  51                 if (forced_tab[i] == x)
  52                         return 1;
  53         }
  54
  55         return 0;
  56 }
  57
  58 static void __init eisa_name_device (struct eisa_device *edev)
  59 {
  60 #ifdef CONFIG_EISA_NAMES
  61         int i;
  62         for (i = 0; i < EISA_INFOS; i++) {
  63                 if (!strcmp (edev->id.sig, eisa_table[i].id.sig)) {
  64                         strlcpy (edev->pretty_name,
  65                                  eisa_table[i].name,
  66                                  DEVICE_NAME_SIZE);
  67                         return;
  68                 }
  69         }
  70
  71         /* No name was found */
  72         sprintf (edev->pretty_name, "EISA device %.7s", edev->id.sig);
  73 #endif
  74 }
  75
  76 static char __init *decode_eisa_sig(unsigned long addr)
  77 {
  78         static char sig_str[EISA_SIG_LEN];
  79         u8 sig[4];
  80         u16 rev;
  81         int i;
  82
  83         for (i = 0; i < 4; i++) {
  84 #ifdef CONFIG_EISA_VLB_PRIMING
  85                 /*
  86                  * This ugly stuff is used to wake up VL-bus cards
  87                  * (AHA-284x is the only known example), so we can
  88                  * read the EISA id.
  89                  *
  90                  * Thankfully, this only exists on x86...
  91                  */
  92                 outb(0x80 + i, addr);
  93 #endif
  94                 sig[i] = inb (addr + i);
  95
  96                 if (!i && (sig[0] & 0x80))
  97                         return NULL;
  98         }
  99
 100         sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
 101         sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
 102         sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
 103         rev = (sig[2] << 8) | sig[3];
 104         sprintf(sig_str + 3, "%04X", rev);
 105
 106         return sig_str;
 107 }
 108
 109 static int eisa_bus_match (struct device *dev, struct device_driver *drv)
 110 {
 111         struct eisa_device *edev = to_eisa_device (dev);
 112         struct eisa_driver *edrv = to_eisa_driver (drv);
 113         const struct eisa_device_id *eids = edrv->id_table;
 114
 115         if (!eids)
 116                 return 0;
 117
 118         while (strlen (eids->sig)) {
 119                 if (!strcmp (eids->sig, edev->id.sig) &&
 120                     edev->state & EISA_CONFIG_ENABLED) {
 121                         edev->id.driver_data = eids->driver_data;
 122                         return 1;
 123                 }
 124
 125                 eids++;
 126         }
 127
 128         return 0;
 129 }
 130
 131 struct bus_type eisa_bus_type = {
 132         .name  = "eisa",
 133         .match = eisa_bus_match,
 134 };
 135
 136 int eisa_driver_register (struct eisa_driver *edrv)
 137 {
 138         int r;
 139
 140         edrv->driver.bus = &eisa_bus_type;
 141         if ((r = driver_register (&edrv->driver)) < 0)
 142                 return r;
 143
 144         return 0;
 145 }
 146
 147 void eisa_driver_unregister (struct eisa_driver *edrv)
 148 {
 149         driver_unregister (&edrv->driver);
 150 }
 151
 152 static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf)
 153 {
 154         struct eisa_device *edev = to_eisa_device (dev);
 155         return sprintf (buf,"%s\n", edev->id.sig);
 156 }
 157
 158 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
 159
 160 static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf)
 161 {
 162         struct eisa_device *edev = to_eisa_device (dev);
 163         return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED);
 164 }
 165
 166 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
 167
 168 static int __init eisa_init_device (struct eisa_root_device *root,
 169                                     struct eisa_device *edev,
 170                                     int slot)
 171 {
 172         char *sig;
 173         unsigned long sig_addr;
 174         int i;
 175
 176         sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
 177
 178         if (!(sig = decode_eisa_sig (sig_addr)))
 179                 return -1;      /* No EISA device here */
 180
 181         memcpy (edev->id.sig, sig, EISA_SIG_LEN);
 182         edev->slot = slot;
 183         edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED;
 184         edev->base_addr = SLOT_ADDRESS (root, slot);
 185         edev->dma_mask = root->dma_mask; /* Default DMA mask */
 186         eisa_name_device (edev);
 187         edev->dev.parent = root->dev;
 188         edev->dev.bus = &eisa_bus_type;
 189         edev->dev.dma_mask = &edev->dma_mask;
 190         edev->dev.coherent_dma_mask = edev->dma_mask;
 191         sprintf (edev->dev.bus_id, "%02X:%02X", root->bus_nr, slot);
 192
 193         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 194 #ifdef CONFIG_EISA_NAMES
 195                 edev->res[i].name = edev->pretty_name;
 196 #else
 197                 edev->res[i].name = edev->id.sig;
 198 #endif
 199         }
 200
 201         if (is_forced_dev (enable_dev, enable_dev_count, root, edev))
 202                 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
 203
 204         if (is_forced_dev (disable_dev, disable_dev_count, root, edev))
 205                 edev->state = EISA_CONFIG_FORCED;
 206
 207         return 0;
 208 }
 209
 210 static int __init eisa_register_device (struct eisa_device *edev)
 211 {
 212         if (device_register (&edev->dev))
 213                 return -1;
 214
 215         device_create_file (&edev->dev, &dev_attr_signature);
 216         device_create_file (&edev->dev, &dev_attr_enabled);
 217
 218         return 0;
 219 }
 220
 221 static int __init eisa_request_resources (struct eisa_root_device *root,
 222                                           struct eisa_device *edev,
 223                                           int slot)
 224 {
 225         int i;
 226
 227         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 228                 /* Don't register resource for slot 0, since this is
 229                  * very likely to fail... :-( Instead, grab the EISA
 230                  * id, now we can display something in /proc/ioports.
 231                  */
 232
 233                 /* Only one region for mainboard */
 234                 if (!slot && i > 0) {
 235                         edev->res[i].start = edev->res[i].end = 0;
 236                         continue;
 237                 }
 238
 239                 if (slot) {
 240                         edev->res[i].name  = NULL;
 241                         edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
 242                         edev->res[i].end   = edev->res[i].start + 0xff;
 243                         edev->res[i].flags = IORESOURCE_IO;
 244                 } else {
 245                         edev->res[i].name  = NULL;
 246                         edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
 247                         edev->res[i].end   = edev->res[i].start + 3;
 248                         edev->res[i].flags = IORESOURCE_BUSY;
 249                 }
 250
 251                 if (request_resource (root->res, &edev->res[i]))
 252                         goto failed;
 253         }
 254
 255         return 0;
 256
 257  failed:
 258         while (--i >= 0)
 259                 release_resource (&edev->res[i]);
 260
 261         return -1;
 262 }
 263
 264 static void __init eisa_release_resources (struct eisa_device *edev)
 265 {
 266         int i;
 267
 268         for (i = 0; i < EISA_MAX_RESOURCES; i++)
 269                 if (edev->res[i].start || edev->res[i].end)
 270                         release_resource (&edev->res[i]);
 271 }
 272
 273 static int __init eisa_probe (struct eisa_root_device *root)
 274 {
 275         int i, c;
 276         struct eisa_device *edev;
 277
 278         printk (KERN_INFO "EISA: Probing bus %d at %s\n",
 279                 root->bus_nr, root->dev->bus_id);
 280
 281         /* First try to get hold of slot 0. If there is no device
 282          * here, simply fail, unless root->force_probe is set. */
 283
 284         if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
 285                 printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
 286                 return -ENOMEM;
 287         }
 288
 289         if (eisa_request_resources (root, edev, 0)) {
 290                 printk (KERN_WARNING \
 291                         "EISA: Cannot allocate resource for mainboard\n");
 292                 kfree (edev);
 293                 if (!root->force_probe)
 294                         return -EBUSY;
 295                 goto force_probe;
 296         }
 297
 298         if (eisa_init_device (root, edev, 0)) {
 299                 eisa_release_resources (edev);
 300                 kfree (edev);
 301                 if (!root->force_probe)
 302                         return -ENODEV;
 303                 goto force_probe;
 304         }
 305
 306         printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);
 307
 308         if (eisa_register_device (edev)) {
 309                 printk (KERN_ERR "EISA: Failed to register %s\n",
 310                         edev->id.sig);
 311                 eisa_release_resources (edev);
 312                 kfree (edev);
 313         }
 314
 315  force_probe:
 316
 317         for (c = 0, i = 1; i <= root->slots; i++) {
 318                 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
 319                         printk (KERN_ERR "EISA: Out of memory for slot %d\n",
 320                                 i);
 321                         continue;
 322                 }
 323
 324                 if (eisa_request_resources (root, edev, i)) {
 325                         printk (KERN_WARNING \
 326                                 "Cannot allocate resource for EISA slot %d\n",
 327                                 i);
 328                         kfree (edev);
 329                         continue;
 330                 }
 331
 332                 if (eisa_init_device (root, edev, i)) {
 333                         eisa_release_resources (edev);
 334                         kfree (edev);
 335                         continue;
 336                 }
 337
 338                 printk (KERN_INFO "EISA: slot %d : %s detected",
 339                         i, edev->id.sig);
 340
 341                 switch (edev->state) {
 342                 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
 343                         printk (" (forced enabled)");
 344                         break;
 345
 346                 case EISA_CONFIG_FORCED:
 347                         printk (" (forced disabled)");
 348                         break;
 349
 350                 case 0:
 351                         printk (" (disabled)");
 352                         break;
 353                 }
 354
 355                 printk (".\n");
 356
 357                 c++;
 358
 359                 if (eisa_register_device (edev)) {
 360                         printk (KERN_ERR "EISA: Failed to register %s\n",
 361                                 edev->id.sig);
 362                         eisa_release_resources (edev);
 363                         kfree (edev);
 364                 }
 365         }
 366
 367         printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");
 368
 369         return 0;
 370 }
 371
 372 static struct resource eisa_root_res = {
 373         .name  = "EISA root resource",
 374         .start = 0,
 375         .end   = 0xffffffff,
 376         .flags = IORESOURCE_IO,
 377 };
 378
 379 static int eisa_bus_count;
 380
 381 int __init eisa_root_register (struct eisa_root_device *root)
 382 {
 383         int err;
 384
 385         /* Use our own resources to check if this bus base address has
 386          * been already registered. This prevents the virtual root
 387          * device from registering after the real one has, for
 388          * example... */
 389
 390         root->eisa_root_res.name  = eisa_root_res.name;
 391         root->eisa_root_res.start = root->res->start;
 392         root->eisa_root_res.end   = root->res->end;
 393         root->eisa_root_res.flags = IORESOURCE_BUSY;
 394
 395         if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
 396                 return err;
 397
 398         root->bus_nr = eisa_bus_count++;
 399
 400         if ((err = eisa_probe (root)))
 401                 release_resource (&root->eisa_root_res);
 402
 403         return err;
 404 }
 405
 406 static int __init eisa_init (void)
 407 {
 408         int r;
 409
 410         if ((r = bus_register (&eisa_bus_type)))
 411                 return r;
 412
 413         printk (KERN_INFO "EISA bus registered\n");
 414         return 0;
 415 }
 416
 417 module_param_array(enable_dev, int, &enable_dev_count, 0444);
 418 module_param_array(disable_dev, int, &disable_dev_count, 0444);
 419
 420 postcore_initcall (eisa_init);
 421
 422 int EISA_bus;           /* for legacy drivers */
 423 EXPORT_SYMBOL (EISA_bus);
 424 EXPORT_SYMBOL (eisa_bus_type);
 425 EXPORT_SYMBOL (eisa_driver_register);
 426 EXPORT_SYMBOL (eisa_driver_unregister);