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[50];
  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 unsigned int enable_dev_count;
  39 static int disable_dev[EISA_MAX_FORCED_DEV];
  40 static unsigned 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                                  sizeof(edev->pretty_name));
  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 static int eisa_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 132 {
 133         struct eisa_device *edev = to_eisa_device(dev);
 134
 135         add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
 136         return 0;
 137 }
 138
 139 struct bus_type eisa_bus_type = {
 140         .name  = "eisa",
 141         .match = eisa_bus_match,
 142         .uevent = eisa_bus_uevent,
 143 };
 144
 145 int eisa_driver_register (struct eisa_driver *edrv)
 146 {
 147         edrv->driver.bus = &eisa_bus_type;
 148         return driver_register (&edrv->driver);
 149 }
 150
 151 void eisa_driver_unregister (struct eisa_driver *edrv)
 152 {
 153         driver_unregister (&edrv->driver);
 154 }
 155
 156 static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf)
 157 {
 158         struct eisa_device *edev = to_eisa_device (dev);
 159         return sprintf (buf,"%s\n", edev->id.sig);
 160 }
 161
 162 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
 163
 164 static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf)
 165 {
 166         struct eisa_device *edev = to_eisa_device (dev);
 167         return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED);
 168 }
 169
 170 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
 171
 172 static ssize_t eisa_show_modalias (struct device *dev, struct device_attribute *attr, char *buf)
 173 {
 174         struct eisa_device *edev = to_eisa_device (dev);
 175         return sprintf (buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
 176 }
 177
 178 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
 179
 180 static int __init eisa_init_device (struct eisa_root_device *root,
 181                                     struct eisa_device *edev,
 182                                     int slot)
 183 {
 184         char *sig;
 185         unsigned long sig_addr;
 186         int i;
 187
 188         sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
 189
 190         if (!(sig = decode_eisa_sig (sig_addr)))
 191                 return -1;      /* No EISA device here */
 192
 193         memcpy (edev->id.sig, sig, EISA_SIG_LEN);
 194         edev->slot = slot;
 195         edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED;
 196         edev->base_addr = SLOT_ADDRESS (root, slot);
 197         edev->dma_mask = root->dma_mask; /* Default DMA mask */
 198         eisa_name_device (edev);
 199         edev->dev.parent = root->dev;
 200         edev->dev.bus = &eisa_bus_type;
 201         edev->dev.dma_mask = &edev->dma_mask;
 202         edev->dev.coherent_dma_mask = edev->dma_mask;
 203         dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);
 204
 205         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 206 #ifdef CONFIG_EISA_NAMES
 207                 edev->res[i].name = edev->pretty_name;
 208 #else
 209                 edev->res[i].name = edev->id.sig;
 210 #endif
 211         }
 212
 213         if (is_forced_dev (enable_dev, enable_dev_count, root, edev))
 214                 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
 215
 216         if (is_forced_dev (disable_dev, disable_dev_count, root, edev))
 217                 edev->state = EISA_CONFIG_FORCED;
 218
 219         return 0;
 220 }
 221
 222 static int __init eisa_register_device (struct eisa_device *edev)
 223 {
 224         int rc = device_register (&edev->dev);
 225         if (rc)
 226                 return rc;
 227
 228         rc = device_create_file (&edev->dev, &dev_attr_signature);
 229         if (rc) goto err_devreg;
 230         rc = device_create_file (&edev->dev, &dev_attr_enabled);
 231         if (rc) goto err_sig;
 232         rc = device_create_file (&edev->dev, &dev_attr_modalias);
 233         if (rc) goto err_enab;
 234
 235         return 0;
 236
 237 err_enab:
 238         device_remove_file (&edev->dev, &dev_attr_enabled);
 239 err_sig:
 240         device_remove_file (&edev->dev, &dev_attr_signature);
 241 err_devreg:
 242         device_unregister(&edev->dev);
 243         return rc;
 244 }
 245
 246 static int __init eisa_request_resources (struct eisa_root_device *root,
 247                                           struct eisa_device *edev,
 248                                           int slot)
 249 {
 250         int i;
 251
 252         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 253                 /* Don't register resource for slot 0, since this is
 254                  * very likely to fail... :-( Instead, grab the EISA
 255                  * id, now we can display something in /proc/ioports.
 256                  */
 257
 258                 /* Only one region for mainboard */
 259                 if (!slot && i > 0) {
 260                         edev->res[i].start = edev->res[i].end = 0;
 261                         continue;
 262                 }
 263
 264                 if (slot) {
 265                         edev->res[i].name  = NULL;
 266                         edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
 267                         edev->res[i].end   = edev->res[i].start + 0xff;
 268                         edev->res[i].flags = IORESOURCE_IO;
 269                 } else {
 270                         edev->res[i].name  = NULL;
 271                         edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
 272                         edev->res[i].end   = edev->res[i].start + 3;
 273                         edev->res[i].flags = IORESOURCE_BUSY;
 274                 }
 275
 276                 if (request_resource (root->res, &edev->res[i]))
 277                         goto failed;
 278         }
 279
 280         return 0;
 281
 282  failed:
 283         while (--i >= 0)
 284                 release_resource (&edev->res[i]);
 285
 286         return -1;
 287 }
 288
 289 static void __init eisa_release_resources (struct eisa_device *edev)
 290 {
 291         int i;
 292
 293         for (i = 0; i < EISA_MAX_RESOURCES; i++)
 294                 if (edev->res[i].start || edev->res[i].end)
 295                         release_resource (&edev->res[i]);
 296 }
 297
 298 static int __init eisa_probe (struct eisa_root_device *root)
 299 {
 300         int i, c;
 301         struct eisa_device *edev;
 302
 303         printk (KERN_INFO "EISA: Probing bus %d at %s\n",
 304                 root->bus_nr, dev_name(root->dev));
 305
 306         /* First try to get hold of slot 0. If there is no device
 307          * here, simply fail, unless root->force_probe is set. */
 308
 309         if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
 310                 printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
 311                 return -ENOMEM;
 312         }
 313
 314         if (eisa_request_resources (root, edev, 0)) {
 315                 printk (KERN_WARNING \
 316                         "EISA: Cannot allocate resource for mainboard\n");
 317                 kfree (edev);
 318                 if (!root->force_probe)
 319                         return -EBUSY;
 320                 goto force_probe;
 321         }
 322
 323         if (eisa_init_device (root, edev, 0)) {
 324                 eisa_release_resources (edev);
 325                 kfree (edev);
 326                 if (!root->force_probe)
 327                         return -ENODEV;
 328                 goto force_probe;
 329         }
 330
 331         printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);
 332
 333         if (eisa_register_device (edev)) {
 334                 printk (KERN_ERR "EISA: Failed to register %s\n",
 335                         edev->id.sig);
 336                 eisa_release_resources (edev);
 337                 kfree (edev);
 338         }
 339
 340  force_probe:
 341
 342         for (c = 0, i = 1; i <= root->slots; i++) {
 343                 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
 344                         printk (KERN_ERR "EISA: Out of memory for slot %d\n",
 345                                 i);
 346                         continue;
 347                 }
 348
 349                 if (eisa_request_resources (root, edev, i)) {
 350                         printk (KERN_WARNING \
 351                                 "Cannot allocate resource for EISA slot %d\n",
 352                                 i);
 353                         kfree (edev);
 354                         continue;
 355                 }
 356
 357                 if (eisa_init_device (root, edev, i)) {
 358                         eisa_release_resources (edev);
 359                         kfree (edev);
 360                         continue;
 361                 }
 362
 363                 printk (KERN_INFO "EISA: slot %d : %s detected",
 364                         i, edev->id.sig);
 365
 366                 switch (edev->state) {
 367                 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
 368                         printk (" (forced enabled)");
 369                         break;
 370
 371                 case EISA_CONFIG_FORCED:
 372                         printk (" (forced disabled)");
 373                         break;
 374
 375                 case 0:
 376                         printk (" (disabled)");
 377                         break;
 378                 }
 379
 380                 printk (".\n");
 381
 382                 c++;
 383
 384                 if (eisa_register_device (edev)) {
 385                         printk (KERN_ERR "EISA: Failed to register %s\n",
 386                                 edev->id.sig);
 387                         eisa_release_resources (edev);
 388                         kfree (edev);
 389                 }
 390         }
 391
 392         printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");
 393
 394         return 0;
 395 }
 396
 397 static struct resource eisa_root_res = {
 398         .name  = "EISA root resource",
 399         .start = 0,
 400         .end   = 0xffffffff,
 401         .flags = IORESOURCE_IO,
 402 };
 403
 404 static int eisa_bus_count;
 405
 406 int __init eisa_root_register (struct eisa_root_device *root)
 407 {
 408         int err;
 409
 410         /* Use our own resources to check if this bus base address has
 411          * been already registered. This prevents the virtual root
 412          * device from registering after the real one has, for
 413          * example... */
 414
 415         root->eisa_root_res.name  = eisa_root_res.name;
 416         root->eisa_root_res.start = root->res->start;
 417         root->eisa_root_res.end   = root->res->end;
 418         root->eisa_root_res.flags = IORESOURCE_BUSY;
 419
 420         if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
 421                 return err;
 422
 423         root->bus_nr = eisa_bus_count++;
 424
 425         if ((err = eisa_probe (root)))
 426                 release_resource (&root->eisa_root_res);
 427
 428         return err;
 429 }
 430
 431 static int __init eisa_init (void)
 432 {
 433         int r;
 434
 435         if ((r = bus_register (&eisa_bus_type)))
 436                 return r;
 437
 438         printk (KERN_INFO "EISA bus registered\n");
 439         return 0;
 440 }
 441
 442 module_param_array(enable_dev, int, &enable_dev_count, 0444);
 443 module_param_array(disable_dev, int, &disable_dev_count, 0444);
 444
 445 postcore_initcall (eisa_init);
 446
 447 int EISA_bus;           /* for legacy drivers */
 448 EXPORT_SYMBOL (EISA_bus);
 449 EXPORT_SYMBOL (eisa_bus_type);
 450 EXPORT_SYMBOL (eisa_driver_register);
 451 EXPORT_SYMBOL (eisa_driver_unregister);