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 EXPORT_SYMBOL(eisa_bus_type);
 145
 146 int eisa_driver_register(struct eisa_driver *edrv)
 147 {
 148         edrv->driver.bus = &eisa_bus_type;
 149         return driver_register(&edrv->driver);
 150 }
 151 EXPORT_SYMBOL(eisa_driver_register);
 152
 153 void eisa_driver_unregister(struct eisa_driver *edrv)
 154 {
 155         driver_unregister(&edrv->driver);
 156 }
 157 EXPORT_SYMBOL(eisa_driver_unregister);
 158
 159 static ssize_t eisa_show_sig(struct device *dev, struct device_attribute *attr,
 160                              char *buf)
 161 {
 162         struct eisa_device *edev = to_eisa_device(dev);
 163         return sprintf(buf, "%s\n", edev->id.sig);
 164 }
 165
 166 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
 167
 168 static ssize_t eisa_show_state(struct device *dev,
 169                                struct device_attribute *attr,
 170                                char *buf)
 171 {
 172         struct eisa_device *edev = to_eisa_device(dev);
 173         return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED);
 174 }
 175
 176 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
 177
 178 static ssize_t eisa_show_modalias(struct device *dev,
 179                                   struct device_attribute *attr,
 180                                   char *buf)
 181 {
 182         struct eisa_device *edev = to_eisa_device(dev);
 183         return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
 184 }
 185
 186 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
 187
 188 static int __init eisa_init_device(struct eisa_root_device *root,
 189                                    struct eisa_device *edev,
 190                                    int slot)
 191 {
 192         char *sig;
 193         unsigned long sig_addr;
 194         int i;
 195
 196         sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET;
 197
 198         sig = decode_eisa_sig(sig_addr);
 199         if (!sig)
 200                 return -1;      /* No EISA device here */
 201
 202         memcpy(edev->id.sig, sig, EISA_SIG_LEN);
 203         edev->slot = slot;
 204         edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET)
 205                       & EISA_CONFIG_ENABLED;
 206         edev->base_addr = SLOT_ADDRESS(root, slot);
 207         edev->dma_mask = root->dma_mask; /* Default DMA mask */
 208         eisa_name_device(edev);
 209         edev->dev.parent = root->dev;
 210         edev->dev.bus = &eisa_bus_type;
 211         edev->dev.dma_mask = &edev->dma_mask;
 212         edev->dev.coherent_dma_mask = edev->dma_mask;
 213         dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);
 214
 215         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 216 #ifdef CONFIG_EISA_NAMES
 217                 edev->res[i].name = edev->pretty_name;
 218 #else
 219                 edev->res[i].name = edev->id.sig;
 220 #endif
 221         }
 222
 223         if (is_forced_dev(enable_dev, enable_dev_count, root, edev))
 224                 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
 225
 226         if (is_forced_dev(disable_dev, disable_dev_count, root, edev))
 227                 edev->state = EISA_CONFIG_FORCED;
 228
 229         return 0;
 230 }
 231
 232 static int __init eisa_register_device(struct eisa_device *edev)
 233 {
 234         int rc = device_register(&edev->dev);
 235         if (rc)
 236                 return rc;
 237
 238         rc = device_create_file(&edev->dev, &dev_attr_signature);
 239         if (rc)
 240                 goto err_devreg;
 241         rc = device_create_file(&edev->dev, &dev_attr_enabled);
 242         if (rc)
 243                 goto err_sig;
 244         rc = device_create_file(&edev->dev, &dev_attr_modalias);
 245         if (rc)
 246                 goto err_enab;
 247
 248         return 0;
 249
 250 err_enab:
 251         device_remove_file(&edev->dev, &dev_attr_enabled);
 252 err_sig:
 253         device_remove_file(&edev->dev, &dev_attr_signature);
 254 err_devreg:
 255         device_unregister(&edev->dev);
 256         return rc;
 257 }
 258
 259 static int __init eisa_request_resources(struct eisa_root_device *root,
 260                                          struct eisa_device *edev,
 261                                          int slot)
 262 {
 263         int i;
 264
 265         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 266                 /* Don't register resource for slot 0, since this is
 267                  * very likely to fail... :-( Instead, grab the EISA
 268                  * id, now we can display something in /proc/ioports.
 269                  */
 270
 271                 /* Only one region for mainboard */
 272                 if (!slot && i > 0) {
 273                         edev->res[i].start = edev->res[i].end = 0;
 274                         continue;
 275                 }
 276
 277                 if (slot) {
 278                         edev->res[i].name  = NULL;
 279                         edev->res[i].start = SLOT_ADDRESS(root, slot)
 280                                              + (i * 0x400);
 281                         edev->res[i].end   = edev->res[i].start + 0xff;
 282                         edev->res[i].flags = IORESOURCE_IO;
 283                 } else {
 284                         edev->res[i].name  = NULL;
 285                         edev->res[i].start = SLOT_ADDRESS(root, slot)
 286                                              + EISA_VENDOR_ID_OFFSET;
 287                         edev->res[i].end   = edev->res[i].start + 3;
 288                         edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY;
 289                 }
 290
 291                 dev_printk(KERN_DEBUG, &edev->dev, "%pR\n", &edev->res[i]);
 292                 if (request_resource(root->res, &edev->res[i]))
 293                         goto failed;
 294         }
 295
 296         return 0;
 297
 298  failed:
 299         while (--i >= 0)
 300                 release_resource(&edev->res[i]);
 301
 302         return -1;
 303 }
 304
 305 static void __init eisa_release_resources(struct eisa_device *edev)
 306 {
 307         int i;
 308
 309         for (i = 0; i < EISA_MAX_RESOURCES; i++)
 310                 if (edev->res[i].start || edev->res[i].end)
 311                         release_resource(&edev->res[i]);
 312 }
 313
 314 static int __init eisa_probe(struct eisa_root_device *root)
 315 {
 316         int i, c;
 317         struct eisa_device *edev;
 318         char *enabled_str;
 319
 320         dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr);
 321
 322         /* First try to get hold of slot 0. If there is no device
 323          * here, simply fail, unless root->force_probe is set. */
 324
 325         edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 326         if (!edev) {
 327                 dev_err(root->dev, "EISA: Couldn't allocate mainboard slot\n");
 328                 return -ENOMEM;
 329         }
 330
 331         if (eisa_request_resources(root, edev, 0)) {
 332                 dev_warn(root->dev,
 333                          "EISA: Cannot allocate resource for mainboard\n");
 334                 kfree(edev);
 335                 if (!root->force_probe)
 336                         return -EBUSY;
 337                 goto force_probe;
 338         }
 339
 340         if (eisa_init_device(root, edev, 0)) {
 341                 eisa_release_resources(edev);
 342                 kfree(edev);
 343                 if (!root->force_probe)
 344                         return -ENODEV;
 345                 goto force_probe;
 346         }
 347
 348         dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig);
 349
 350         if (eisa_register_device(edev)) {
 351                 dev_err(&edev->dev, "EISA: Failed to register %s\n",
 352                         edev->id.sig);
 353                 eisa_release_resources(edev);
 354                 kfree(edev);
 355         }
 356
 357  force_probe:
 358
 359         for (c = 0, i = 1; i <= root->slots; i++) {
 360                 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 361                 if (!edev) {
 362                         dev_err(root->dev, "EISA: Out of memory for slot %d\n",
 363                                 i);
 364                         continue;
 365                 }
 366
 367                 if (eisa_request_resources(root, edev, i)) {
 368                         dev_warn(root->dev,
 369                                  "Cannot allocate resource for EISA slot %d\n",
 370                                  i);
 371                         kfree(edev);
 372                         continue;
 373                 }
 374
 375                 if (eisa_init_device(root, edev, i)) {
 376                         eisa_release_resources(edev);
 377                         kfree(edev);
 378                         continue;
 379                 }
 380
 381                 if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED))
 382                         enabled_str = " (forced enabled)";
 383                 else if (edev->state == EISA_CONFIG_FORCED)
 384                         enabled_str = " (forced disabled)";
 385                 else if (edev->state == 0)
 386                         enabled_str = " (disabled)";
 387                 else
 388                         enabled_str = "";
 389
 390                 dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i,
 391                          edev->id.sig, enabled_str);
 392
 393                 c++;
 394
 395                 if (eisa_register_device(edev)) {
 396                         dev_err(&edev->dev, "EISA: Failed to register %s\n",
 397                                 edev->id.sig);
 398                         eisa_release_resources(edev);
 399                         kfree(edev);
 400                 }
 401         }
 402
 403         dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s");
 404         return 0;
 405 }
 406
 407 static struct resource eisa_root_res = {
 408         .name  = "EISA root resource",
 409         .start = 0,
 410         .end   = 0xffffffff,
 411         .flags = IORESOURCE_IO,
 412 };
 413
 414 static int eisa_bus_count;
 415
 416 int __init eisa_root_register(struct eisa_root_device *root)
 417 {
 418         int err;
 419
 420         /* Use our own resources to check if this bus base address has
 421          * been already registered. This prevents the virtual root
 422          * device from registering after the real one has, for
 423          * example... */
 424
 425         root->eisa_root_res.name  = eisa_root_res.name;
 426         root->eisa_root_res.start = root->res->start;
 427         root->eisa_root_res.end   = root->res->end;
 428         root->eisa_root_res.flags = IORESOURCE_BUSY;
 429
 430         err = request_resource(&eisa_root_res, &root->eisa_root_res);
 431         if (err)
 432                 return err;
 433
 434         root->bus_nr = eisa_bus_count++;
 435
 436         err = eisa_probe(root);
 437         if (err)
 438                 release_resource(&root->eisa_root_res);
 439
 440         return err;
 441 }
 442
 443 static int __init eisa_init(void)
 444 {
 445         int r;
 446
 447         r = bus_register(&eisa_bus_type);
 448         if (r)
 449                 return r;
 450
 451         printk(KERN_INFO "EISA bus registered\n");
 452         return 0;
 453 }
 454
 455 module_param_array(enable_dev, int, &enable_dev_count, 0444);
 456 module_param_array(disable_dev, int, &disable_dev_count, 0444);
 457
 458 postcore_initcall(eisa_init);
 459
 460 int EISA_bus;           /* for legacy drivers */
 461 EXPORT_SYMBOL(EISA_bus);