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 put_device(&edev->dev); 237 return rc; 238 } 239 240 rc = device_create_file(&edev->dev, &dev_attr_signature); 241 if (rc) 242 goto err_devreg; 243 rc = device_create_file(&edev->dev, &dev_attr_enabled); 244 if (rc) 245 goto err_sig; 246 rc = device_create_file(&edev->dev, &dev_attr_modalias); 247 if (rc) 248 goto err_enab; 249 250 return 0; 251 252 err_enab: 253 device_remove_file(&edev->dev, &dev_attr_enabled); 254 err_sig: 255 device_remove_file(&edev->dev, &dev_attr_signature); 256 err_devreg: 257 device_unregister(&edev->dev); 258 return rc; 259 } 260 261 static int __init eisa_request_resources(struct eisa_root_device *root, 262 struct eisa_device *edev, 263 int slot) 264 { 265 int i; 266 267 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 268 /* Don't register resource for slot 0, since this is 269 * very likely to fail... :-( Instead, grab the EISA 270 * id, now we can display something in /proc/ioports. 271 */ 272 273 /* Only one region for mainboard */ 274 if (!slot && i > 0) { 275 edev->res[i].start = edev->res[i].end = 0; 276 continue; 277 } 278 279 if (slot) { 280 edev->res[i].name = NULL; 281 edev->res[i].start = SLOT_ADDRESS(root, slot) 282 + (i * 0x400); 283 edev->res[i].end = edev->res[i].start + 0xff; 284 edev->res[i].flags = IORESOURCE_IO; 285 } else { 286 edev->res[i].name = NULL; 287 edev->res[i].start = SLOT_ADDRESS(root, slot) 288 + EISA_VENDOR_ID_OFFSET; 289 edev->res[i].end = edev->res[i].start + 3; 290 edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY; 291 } 292 293 if (request_resource(root->res, &edev->res[i])) 294 goto failed; 295 } 296 297 return 0; 298 299 failed: 300 while (--i >= 0) 301 release_resource(&edev->res[i]); 302 303 return -1; 304 } 305 306 static void __init eisa_release_resources(struct eisa_device *edev) 307 { 308 int i; 309 310 for (i = 0; i < EISA_MAX_RESOURCES; i++) 311 if (edev->res[i].start || edev->res[i].end) 312 release_resource(&edev->res[i]); 313 } 314 315 static int __init eisa_probe(struct eisa_root_device *root) 316 { 317 int i, c; 318 struct eisa_device *edev; 319 char *enabled_str; 320 321 dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr); 322 323 /* First try to get hold of slot 0. If there is no device 324 * here, simply fail, unless root->force_probe is set. */ 325 326 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 327 if (!edev) 328 return -ENOMEM; 329 330 if (eisa_request_resources(root, edev, 0)) { 331 dev_warn(root->dev, 332 "EISA: Cannot allocate resource for mainboard\n"); 333 kfree(edev); 334 if (!root->force_probe) 335 return -EBUSY; 336 goto force_probe; 337 } 338 339 if (eisa_init_device(root, edev, 0)) { 340 eisa_release_resources(edev); 341 kfree(edev); 342 if (!root->force_probe) 343 return -ENODEV; 344 goto force_probe; 345 } 346 347 dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig); 348 349 if (eisa_register_device(edev)) { 350 dev_err(&edev->dev, "EISA: Failed to register %s\n", 351 edev->id.sig); 352 eisa_release_resources(edev); 353 kfree(edev); 354 } 355 356 force_probe: 357 358 for (c = 0, i = 1; i <= root->slots; i++) { 359 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 360 if (!edev) { 361 dev_err(root->dev, "EISA: Out of memory for slot %d\n", 362 i); 363 continue; 364 } 365 366 if (eisa_request_resources(root, edev, i)) { 367 dev_warn(root->dev, 368 "Cannot allocate resource for EISA slot %d\n", 369 i); 370 kfree(edev); 371 continue; 372 } 373 374 if (eisa_init_device(root, edev, i)) { 375 eisa_release_resources(edev); 376 kfree(edev); 377 continue; 378 } 379 380 if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED)) 381 enabled_str = " (forced enabled)"; 382 else if (edev->state == EISA_CONFIG_FORCED) 383 enabled_str = " (forced disabled)"; 384 else if (edev->state == 0) 385 enabled_str = " (disabled)"; 386 else 387 enabled_str = ""; 388 389 dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i, 390 edev->id.sig, enabled_str); 391 392 c++; 393 394 if (eisa_register_device(edev)) { 395 dev_err(&edev->dev, "EISA: Failed to register %s\n", 396 edev->id.sig); 397 eisa_release_resources(edev); 398 kfree(edev); 399 } 400 } 401 402 dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s"); 403 return 0; 404 } 405 406 static struct resource eisa_root_res = { 407 .name = "EISA root resource", 408 .start = 0, 409 .end = 0xffffffff, 410 .flags = IORESOURCE_IO, 411 }; 412 413 static int eisa_bus_count; 414 415 int __init eisa_root_register(struct eisa_root_device *root) 416 { 417 int err; 418 419 /* Use our own resources to check if this bus base address has 420 * been already registered. This prevents the virtual root 421 * device from registering after the real one has, for 422 * example... */ 423 424 root->eisa_root_res.name = eisa_root_res.name; 425 root->eisa_root_res.start = root->res->start; 426 root->eisa_root_res.end = root->res->end; 427 root->eisa_root_res.flags = IORESOURCE_BUSY; 428 429 err = request_resource(&eisa_root_res, &root->eisa_root_res); 430 if (err) 431 return err; 432 433 root->bus_nr = eisa_bus_count++; 434 435 err = eisa_probe(root); 436 if (err) 437 release_resource(&root->eisa_root_res); 438 439 return err; 440 } 441 442 static int __init eisa_init(void) 443 { 444 int r; 445 446 r = bus_register(&eisa_bus_type); 447 if (r) 448 return r; 449 450 printk(KERN_INFO "EISA bus registered\n"); 451 return 0; 452 } 453 454 module_param_array(enable_dev, int, &enable_dev_count, 0444); 455 module_param_array(disable_dev, int, &disable_dev_count, 0444); 456 457 postcore_initcall(eisa_init); 458 459 int EISA_bus; /* for legacy drivers */ 460 EXPORT_SYMBOL(EISA_bus); 461