1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * EISA bus support functions for sysfs. 4 * 5 * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/device.h> 10 #include <linux/eisa.h> 11 #include <linux/module.h> 12 #include <linux/moduleparam.h> 13 #include <linux/init.h> 14 #include <linux/slab.h> 15 #include <linux/ioport.h> 16 #include <asm/io.h> 17 18 #define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n)) 19 20 #define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s } 21 22 struct eisa_device_info { 23 struct eisa_device_id id; 24 char name[50]; 25 }; 26 27 #ifdef CONFIG_EISA_NAMES 28 static struct eisa_device_info __initdata eisa_table[] = { 29 #include "devlist.h" 30 }; 31 #define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info))) 32 #endif 33 34 #define EISA_MAX_FORCED_DEV 16 35 36 static int enable_dev[EISA_MAX_FORCED_DEV]; 37 static unsigned int enable_dev_count; 38 static int disable_dev[EISA_MAX_FORCED_DEV]; 39 static unsigned int disable_dev_count; 40 41 static int is_forced_dev(int *forced_tab, 42 int forced_count, 43 struct eisa_root_device *root, 44 struct eisa_device *edev) 45 { 46 int i, x; 47 48 for (i = 0; i < forced_count; i++) { 49 x = (root->bus_nr << 8) | edev->slot; 50 if (forced_tab[i] == x) 51 return 1; 52 } 53 54 return 0; 55 } 56 57 static void __init eisa_name_device(struct eisa_device *edev) 58 { 59 #ifdef CONFIG_EISA_NAMES 60 int i; 61 for (i = 0; i < EISA_INFOS; i++) { 62 if (!strcmp(edev->id.sig, eisa_table[i].id.sig)) { 63 strlcpy(edev->pretty_name, 64 eisa_table[i].name, 65 sizeof(edev->pretty_name)); 66 return; 67 } 68 } 69 70 /* No name was found */ 71 sprintf(edev->pretty_name, "EISA device %.7s", edev->id.sig); 72 #endif 73 } 74 75 static char __init *decode_eisa_sig(unsigned long addr) 76 { 77 static char sig_str[EISA_SIG_LEN]; 78 u8 sig[4]; 79 u16 rev; 80 int i; 81 82 for (i = 0; i < 4; i++) { 83 #ifdef CONFIG_EISA_VLB_PRIMING 84 /* 85 * This ugly stuff is used to wake up VL-bus cards 86 * (AHA-284x is the only known example), so we can 87 * read the EISA id. 88 * 89 * Thankfully, this only exists on x86... 90 */ 91 outb(0x80 + i, addr); 92 #endif 93 sig[i] = inb(addr + i); 94 95 if (!i && (sig[0] & 0x80)) 96 return NULL; 97 } 98 99 sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1); 100 sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1); 101 sig_str[2] = (sig[1] & 0x1f) + ('A' - 1); 102 rev = (sig[2] << 8) | sig[3]; 103 sprintf(sig_str + 3, "%04X", rev); 104 105 return sig_str; 106 } 107 108 static int eisa_bus_match(struct device *dev, struct device_driver *drv) 109 { 110 struct eisa_device *edev = to_eisa_device(dev); 111 struct eisa_driver *edrv = to_eisa_driver(drv); 112 const struct eisa_device_id *eids = edrv->id_table; 113 114 if (!eids) 115 return 0; 116 117 while (strlen(eids->sig)) { 118 if (!strcmp(eids->sig, edev->id.sig) && 119 edev->state & EISA_CONFIG_ENABLED) { 120 edev->id.driver_data = eids->driver_data; 121 return 1; 122 } 123 124 eids++; 125 } 126 127 return 0; 128 } 129 130 static int eisa_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 131 { 132 struct eisa_device *edev = to_eisa_device(dev); 133 134 add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig); 135 return 0; 136 } 137 138 struct bus_type eisa_bus_type = { 139 .name = "eisa", 140 .match = eisa_bus_match, 141 .uevent = eisa_bus_uevent, 142 }; 143 EXPORT_SYMBOL(eisa_bus_type); 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 EXPORT_SYMBOL(eisa_driver_register); 151 152 void eisa_driver_unregister(struct eisa_driver *edrv) 153 { 154 driver_unregister(&edrv->driver); 155 } 156 EXPORT_SYMBOL(eisa_driver_unregister); 157 158 static ssize_t eisa_show_sig(struct device *dev, struct device_attribute *attr, 159 char *buf) 160 { 161 struct eisa_device *edev = to_eisa_device(dev); 162 return sprintf(buf, "%s\n", edev->id.sig); 163 } 164 165 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL); 166 167 static ssize_t eisa_show_state(struct device *dev, 168 struct device_attribute *attr, 169 char *buf) 170 { 171 struct eisa_device *edev = to_eisa_device(dev); 172 return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED); 173 } 174 175 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL); 176 177 static ssize_t eisa_show_modalias(struct device *dev, 178 struct device_attribute *attr, 179 char *buf) 180 { 181 struct eisa_device *edev = to_eisa_device(dev); 182 return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig); 183 } 184 185 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL); 186 187 static int __init eisa_init_device(struct eisa_root_device *root, 188 struct eisa_device *edev, 189 int slot) 190 { 191 char *sig; 192 unsigned long sig_addr; 193 int i; 194 195 sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET; 196 197 sig = decode_eisa_sig(sig_addr); 198 if (!sig) 199 return -1; /* No EISA device here */ 200 201 memcpy(edev->id.sig, sig, EISA_SIG_LEN); 202 edev->slot = slot; 203 edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET) 204 & EISA_CONFIG_ENABLED; 205 edev->base_addr = SLOT_ADDRESS(root, slot); 206 edev->dma_mask = root->dma_mask; /* Default DMA mask */ 207 eisa_name_device(edev); 208 edev->dev.parent = root->dev; 209 edev->dev.bus = &eisa_bus_type; 210 edev->dev.dma_mask = &edev->dma_mask; 211 edev->dev.coherent_dma_mask = edev->dma_mask; 212 dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot); 213 214 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 215 #ifdef CONFIG_EISA_NAMES 216 edev->res[i].name = edev->pretty_name; 217 #else 218 edev->res[i].name = edev->id.sig; 219 #endif 220 } 221 222 if (is_forced_dev(enable_dev, enable_dev_count, root, edev)) 223 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED; 224 225 if (is_forced_dev(disable_dev, disable_dev_count, root, edev)) 226 edev->state = EISA_CONFIG_FORCED; 227 228 return 0; 229 } 230 231 static int __init eisa_register_device(struct eisa_device *edev) 232 { 233 int rc = device_register(&edev->dev); 234 if (rc) { 235 put_device(&edev->dev); 236 return rc; 237 } 238 239 rc = device_create_file(&edev->dev, &dev_attr_signature); 240 if (rc) 241 goto err_devreg; 242 rc = device_create_file(&edev->dev, &dev_attr_enabled); 243 if (rc) 244 goto err_sig; 245 rc = device_create_file(&edev->dev, &dev_attr_modalias); 246 if (rc) 247 goto err_enab; 248 249 return 0; 250 251 err_enab: 252 device_remove_file(&edev->dev, &dev_attr_enabled); 253 err_sig: 254 device_remove_file(&edev->dev, &dev_attr_signature); 255 err_devreg: 256 device_unregister(&edev->dev); 257 return rc; 258 } 259 260 static int __init eisa_request_resources(struct eisa_root_device *root, 261 struct eisa_device *edev, 262 int slot) 263 { 264 int i; 265 266 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 267 /* Don't register resource for slot 0, since this is 268 * very likely to fail... :-( Instead, grab the EISA 269 * id, now we can display something in /proc/ioports. 270 */ 271 272 /* Only one region for mainboard */ 273 if (!slot && i > 0) { 274 edev->res[i].start = edev->res[i].end = 0; 275 continue; 276 } 277 278 if (slot) { 279 edev->res[i].name = NULL; 280 edev->res[i].start = SLOT_ADDRESS(root, slot) 281 + (i * 0x400); 282 edev->res[i].end = edev->res[i].start + 0xff; 283 edev->res[i].flags = IORESOURCE_IO; 284 } else { 285 edev->res[i].name = NULL; 286 edev->res[i].start = SLOT_ADDRESS(root, slot) 287 + EISA_VENDOR_ID_OFFSET; 288 edev->res[i].end = edev->res[i].start + 3; 289 edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY; 290 } 291 292 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 return -ENOMEM; 328 329 if (eisa_request_resources(root, edev, 0)) { 330 dev_warn(root->dev, 331 "EISA: Cannot allocate resource for mainboard\n"); 332 kfree(edev); 333 if (!root->force_probe) 334 return -EBUSY; 335 goto force_probe; 336 } 337 338 if (eisa_init_device(root, edev, 0)) { 339 eisa_release_resources(edev); 340 kfree(edev); 341 if (!root->force_probe) 342 return -ENODEV; 343 goto force_probe; 344 } 345 346 dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig); 347 348 if (eisa_register_device(edev)) { 349 dev_err(&edev->dev, "EISA: Failed to register %s\n", 350 edev->id.sig); 351 eisa_release_resources(edev); 352 kfree(edev); 353 } 354 355 force_probe: 356 357 for (c = 0, i = 1; i <= root->slots; i++) { 358 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 359 if (!edev) { 360 dev_err(root->dev, "EISA: Out of memory for slot %d\n", 361 i); 362 continue; 363 } 364 365 if (eisa_request_resources(root, edev, i)) { 366 dev_warn(root->dev, 367 "Cannot allocate resource for EISA slot %d\n", 368 i); 369 kfree(edev); 370 continue; 371 } 372 373 if (eisa_init_device(root, edev, i)) { 374 eisa_release_resources(edev); 375 kfree(edev); 376 continue; 377 } 378 379 if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED)) 380 enabled_str = " (forced enabled)"; 381 else if (edev->state == EISA_CONFIG_FORCED) 382 enabled_str = " (forced disabled)"; 383 else if (edev->state == 0) 384 enabled_str = " (disabled)"; 385 else 386 enabled_str = ""; 387 388 dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i, 389 edev->id.sig, enabled_str); 390 391 c++; 392 393 if (eisa_register_device(edev)) { 394 dev_err(&edev->dev, "EISA: Failed to register %s\n", 395 edev->id.sig); 396 eisa_release_resources(edev); 397 kfree(edev); 398 } 399 } 400 401 dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s"); 402 return 0; 403 } 404 405 static struct resource eisa_root_res = { 406 .name = "EISA root resource", 407 .start = 0, 408 .end = 0xffffffff, 409 .flags = IORESOURCE_IO, 410 }; 411 412 static int eisa_bus_count; 413 414 int __init eisa_root_register(struct eisa_root_device *root) 415 { 416 int err; 417 418 /* Use our own resources to check if this bus base address has 419 * been already registered. This prevents the virtual root 420 * device from registering after the real one has, for 421 * example... */ 422 423 root->eisa_root_res.name = eisa_root_res.name; 424 root->eisa_root_res.start = root->res->start; 425 root->eisa_root_res.end = root->res->end; 426 root->eisa_root_res.flags = IORESOURCE_BUSY; 427 428 err = request_resource(&eisa_root_res, &root->eisa_root_res); 429 if (err) 430 return err; 431 432 root->bus_nr = eisa_bus_count++; 433 434 err = eisa_probe(root); 435 if (err) 436 release_resource(&root->eisa_root_res); 437 438 return err; 439 } 440 441 static int __init eisa_init(void) 442 { 443 int r; 444 445 r = bus_register(&eisa_bus_type); 446 if (r) 447 return r; 448 449 printk(KERN_INFO "EISA bus registered\n"); 450 return 0; 451 } 452 453 module_param_array(enable_dev, int, &enable_dev_count, 0444); 454 module_param_array(disable_dev, int, &disable_dev_count, 0444); 455 456 postcore_initcall(eisa_init); 457 458 int EISA_bus; /* for legacy drivers */ 459 EXPORT_SYMBOL(EISA_bus); 460