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/string_choices.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[EISA_DEVICE_INFO_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 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 strscpy(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, const struct device_driver *drv) 110 { 111 struct eisa_device *edev = to_eisa_device(dev); 112 const 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(const struct device *dev, struct kobj_uevent_env *env) 132 { 133 const 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 const 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 signature_show(struct device *dev, 160 struct device_attribute *attr, char *buf) 161 { 162 struct eisa_device *edev = to_eisa_device(dev); 163 return sprintf(buf, "%s\n", edev->id.sig); 164 } 165 static DEVICE_ATTR_RO(signature); 166 167 static ssize_t enabled_show(struct device *dev, 168 struct device_attribute *attr, char *buf) 169 { 170 struct eisa_device *edev = to_eisa_device(dev); 171 return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED); 172 } 173 static DEVICE_ATTR_RO(enabled); 174 175 static ssize_t modalias_show(struct device *dev, 176 struct device_attribute *attr, char *buf) 177 { 178 struct eisa_device *edev = to_eisa_device(dev); 179 return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig); 180 } 181 static DEVICE_ATTR_RO(modalias); 182 183 static int __init eisa_init_device(struct eisa_root_device *root, 184 struct eisa_device *edev, 185 int slot) 186 { 187 char *sig; 188 unsigned long sig_addr; 189 int i; 190 191 sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET; 192 193 sig = decode_eisa_sig(sig_addr); 194 if (!sig) 195 return -1; /* No EISA device here */ 196 197 memcpy(edev->id.sig, sig, EISA_SIG_LEN); 198 edev->slot = slot; 199 edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET) 200 & EISA_CONFIG_ENABLED; 201 edev->base_addr = SLOT_ADDRESS(root, slot); 202 edev->dma_mask = root->dma_mask; /* Default DMA mask */ 203 eisa_name_device(edev); 204 edev->dev.parent = root->dev; 205 edev->dev.bus = &eisa_bus_type; 206 edev->dev.dma_mask = &edev->dma_mask; 207 edev->dev.coherent_dma_mask = edev->dma_mask; 208 dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot); 209 210 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 211 #ifdef CONFIG_EISA_NAMES 212 edev->res[i].name = edev->pretty_name; 213 #else 214 edev->res[i].name = edev->id.sig; 215 #endif 216 } 217 218 if (is_forced_dev(enable_dev, enable_dev_count, root, edev)) 219 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED; 220 221 if (is_forced_dev(disable_dev, disable_dev_count, root, edev)) 222 edev->state = EISA_CONFIG_FORCED; 223 224 return 0; 225 } 226 227 static int __init eisa_register_device(struct eisa_device *edev) 228 { 229 int rc = device_register(&edev->dev); 230 if (rc) { 231 put_device(&edev->dev); 232 return rc; 233 } 234 235 rc = device_create_file(&edev->dev, &dev_attr_signature); 236 if (rc) 237 goto err_devreg; 238 rc = device_create_file(&edev->dev, &dev_attr_enabled); 239 if (rc) 240 goto err_sig; 241 rc = device_create_file(&edev->dev, &dev_attr_modalias); 242 if (rc) 243 goto err_enab; 244 245 return 0; 246 247 err_enab: 248 device_remove_file(&edev->dev, &dev_attr_enabled); 249 err_sig: 250 device_remove_file(&edev->dev, &dev_attr_signature); 251 err_devreg: 252 device_unregister(&edev->dev); 253 return rc; 254 } 255 256 static int __init eisa_request_resources(struct eisa_root_device *root, 257 struct eisa_device *edev, 258 int slot) 259 { 260 int i; 261 262 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 263 /* Don't register resource for slot 0, since this is 264 * very likely to fail... :-( Instead, grab the EISA 265 * id, now we can display something in /proc/ioports. 266 */ 267 268 /* Only one region for mainboard */ 269 if (!slot && i > 0) { 270 edev->res[i].start = edev->res[i].end = 0; 271 continue; 272 } 273 274 if (slot) { 275 edev->res[i].name = NULL; 276 edev->res[i].start = SLOT_ADDRESS(root, slot) 277 + (i * 0x400); 278 edev->res[i].end = edev->res[i].start + 0xff; 279 edev->res[i].flags = IORESOURCE_IO; 280 } else { 281 edev->res[i].name = NULL; 282 edev->res[i].start = SLOT_ADDRESS(root, slot) 283 + EISA_VENDOR_ID_OFFSET; 284 edev->res[i].end = edev->res[i].start + 3; 285 edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY; 286 } 287 288 if (request_resource(root->res, &edev->res[i])) 289 goto failed; 290 } 291 292 return 0; 293 294 failed: 295 while (--i >= 0) 296 release_resource(&edev->res[i]); 297 298 return -1; 299 } 300 301 static void __init eisa_release_resources(struct eisa_device *edev) 302 { 303 int i; 304 305 for (i = 0; i < EISA_MAX_RESOURCES; i++) 306 if (edev->res[i].start || edev->res[i].end) 307 release_resource(&edev->res[i]); 308 } 309 310 static int __init eisa_probe(struct eisa_root_device *root) 311 { 312 int i, c; 313 struct eisa_device *edev; 314 char *enabled_str; 315 316 dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr); 317 318 /* First try to get hold of slot 0. If there is no device 319 * here, simply fail, unless root->force_probe is set. */ 320 321 edev = kzalloc_obj(*edev); 322 if (!edev) 323 return -ENOMEM; 324 325 if (eisa_request_resources(root, edev, 0)) { 326 dev_warn(root->dev, 327 "EISA: Cannot allocate resource for mainboard\n"); 328 kfree(edev); 329 if (!root->force_probe) 330 return -EBUSY; 331 goto force_probe; 332 } 333 334 if (eisa_init_device(root, edev, 0)) { 335 eisa_release_resources(edev); 336 kfree(edev); 337 if (!root->force_probe) 338 return -ENODEV; 339 goto force_probe; 340 } 341 342 dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig); 343 344 if (eisa_register_device(edev)) { 345 dev_err(&edev->dev, "EISA: Failed to register %s\n", 346 edev->id.sig); 347 eisa_release_resources(edev); 348 kfree(edev); 349 } 350 351 force_probe: 352 353 for (c = 0, i = 1; i <= root->slots; i++) { 354 edev = kzalloc_obj(*edev); 355 if (!edev) { 356 dev_err(root->dev, "EISA: Out of memory for slot %d\n", 357 i); 358 continue; 359 } 360 361 if (eisa_request_resources(root, edev, i)) { 362 dev_warn(root->dev, 363 "Cannot allocate resource for EISA slot %d\n", 364 i); 365 kfree(edev); 366 continue; 367 } 368 369 if (eisa_init_device(root, edev, i)) { 370 eisa_release_resources(edev); 371 kfree(edev); 372 continue; 373 } 374 375 if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED)) 376 enabled_str = " (forced enabled)"; 377 else if (edev->state == EISA_CONFIG_FORCED) 378 enabled_str = " (forced disabled)"; 379 else if (edev->state == 0) 380 enabled_str = " (disabled)"; 381 else 382 enabled_str = ""; 383 384 dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i, 385 edev->id.sig, enabled_str); 386 387 c++; 388 389 if (eisa_register_device(edev)) { 390 dev_err(&edev->dev, "EISA: Failed to register %s\n", 391 edev->id.sig); 392 eisa_release_resources(edev); 393 kfree(edev); 394 } 395 } 396 397 dev_info(root->dev, "EISA: Detected %d card%s\n", c, str_plural(c)); 398 return 0; 399 } 400 401 static struct resource eisa_root_res = { 402 .name = "EISA root resource", 403 .start = 0, 404 .end = 0xffffffff, 405 .flags = IORESOURCE_IO, 406 }; 407 408 static int eisa_bus_count; 409 410 int __init eisa_root_register(struct eisa_root_device *root) 411 { 412 int err; 413 414 /* Use our own resources to check if this bus base address has 415 * been already registered. This prevents the virtual root 416 * device from registering after the real one has, for 417 * example... */ 418 419 root->eisa_root_res.name = eisa_root_res.name; 420 root->eisa_root_res.start = root->res->start; 421 root->eisa_root_res.end = root->res->end; 422 root->eisa_root_res.flags = IORESOURCE_BUSY; 423 424 err = request_resource(&eisa_root_res, &root->eisa_root_res); 425 if (err) 426 return err; 427 428 root->bus_nr = eisa_bus_count++; 429 430 err = eisa_probe(root); 431 if (err) 432 release_resource(&root->eisa_root_res); 433 434 return err; 435 } 436 437 static int __init eisa_init(void) 438 { 439 int r; 440 441 r = bus_register(&eisa_bus_type); 442 if (r) 443 return r; 444 445 printk(KERN_INFO "EISA bus registered\n"); 446 return 0; 447 } 448 449 module_param_array(enable_dev, int, &enable_dev_count, 0444); 450 module_param_array(disable_dev, int, &disable_dev_count, 0444); 451 452 postcore_initcall(eisa_init); 453 454 int EISA_bus; /* for legacy drivers */ 455 EXPORT_SYMBOL(EISA_bus); 456