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 strscpy(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(const struct device *dev, struct kobj_uevent_env *env) 131 { 132 const 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 signature_show(struct device *dev, 159 struct device_attribute *attr, char *buf) 160 { 161 struct eisa_device *edev = to_eisa_device(dev); 162 return sprintf(buf, "%s\n", edev->id.sig); 163 } 164 static DEVICE_ATTR_RO(signature); 165 166 static ssize_t enabled_show(struct device *dev, 167 struct device_attribute *attr, char *buf) 168 { 169 struct eisa_device *edev = to_eisa_device(dev); 170 return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED); 171 } 172 static DEVICE_ATTR_RO(enabled); 173 174 static ssize_t modalias_show(struct device *dev, 175 struct device_attribute *attr, char *buf) 176 { 177 struct eisa_device *edev = to_eisa_device(dev); 178 return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig); 179 } 180 static DEVICE_ATTR_RO(modalias); 181 182 static int __init eisa_init_device(struct eisa_root_device *root, 183 struct eisa_device *edev, 184 int slot) 185 { 186 char *sig; 187 unsigned long sig_addr; 188 int i; 189 190 sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET; 191 192 sig = decode_eisa_sig(sig_addr); 193 if (!sig) 194 return -1; /* No EISA device here */ 195 196 memcpy(edev->id.sig, sig, EISA_SIG_LEN); 197 edev->slot = slot; 198 edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET) 199 & EISA_CONFIG_ENABLED; 200 edev->base_addr = SLOT_ADDRESS(root, slot); 201 edev->dma_mask = root->dma_mask; /* Default DMA mask */ 202 eisa_name_device(edev); 203 edev->dev.parent = root->dev; 204 edev->dev.bus = &eisa_bus_type; 205 edev->dev.dma_mask = &edev->dma_mask; 206 edev->dev.coherent_dma_mask = edev->dma_mask; 207 dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot); 208 209 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 210 #ifdef CONFIG_EISA_NAMES 211 edev->res[i].name = edev->pretty_name; 212 #else 213 edev->res[i].name = edev->id.sig; 214 #endif 215 } 216 217 if (is_forced_dev(enable_dev, enable_dev_count, root, edev)) 218 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED; 219 220 if (is_forced_dev(disable_dev, disable_dev_count, root, edev)) 221 edev->state = EISA_CONFIG_FORCED; 222 223 return 0; 224 } 225 226 static int __init eisa_register_device(struct eisa_device *edev) 227 { 228 int rc = device_register(&edev->dev); 229 if (rc) { 230 put_device(&edev->dev); 231 return rc; 232 } 233 234 rc = device_create_file(&edev->dev, &dev_attr_signature); 235 if (rc) 236 goto err_devreg; 237 rc = device_create_file(&edev->dev, &dev_attr_enabled); 238 if (rc) 239 goto err_sig; 240 rc = device_create_file(&edev->dev, &dev_attr_modalias); 241 if (rc) 242 goto err_enab; 243 244 return 0; 245 246 err_enab: 247 device_remove_file(&edev->dev, &dev_attr_enabled); 248 err_sig: 249 device_remove_file(&edev->dev, &dev_attr_signature); 250 err_devreg: 251 device_unregister(&edev->dev); 252 return rc; 253 } 254 255 static int __init eisa_request_resources(struct eisa_root_device *root, 256 struct eisa_device *edev, 257 int slot) 258 { 259 int i; 260 261 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 262 /* Don't register resource for slot 0, since this is 263 * very likely to fail... :-( Instead, grab the EISA 264 * id, now we can display something in /proc/ioports. 265 */ 266 267 /* Only one region for mainboard */ 268 if (!slot && i > 0) { 269 edev->res[i].start = edev->res[i].end = 0; 270 continue; 271 } 272 273 if (slot) { 274 edev->res[i].name = NULL; 275 edev->res[i].start = SLOT_ADDRESS(root, slot) 276 + (i * 0x400); 277 edev->res[i].end = edev->res[i].start + 0xff; 278 edev->res[i].flags = IORESOURCE_IO; 279 } else { 280 edev->res[i].name = NULL; 281 edev->res[i].start = SLOT_ADDRESS(root, slot) 282 + EISA_VENDOR_ID_OFFSET; 283 edev->res[i].end = edev->res[i].start + 3; 284 edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY; 285 } 286 287 if (request_resource(root->res, &edev->res[i])) 288 goto failed; 289 } 290 291 return 0; 292 293 failed: 294 while (--i >= 0) 295 release_resource(&edev->res[i]); 296 297 return -1; 298 } 299 300 static void __init eisa_release_resources(struct eisa_device *edev) 301 { 302 int i; 303 304 for (i = 0; i < EISA_MAX_RESOURCES; i++) 305 if (edev->res[i].start || edev->res[i].end) 306 release_resource(&edev->res[i]); 307 } 308 309 static int __init eisa_probe(struct eisa_root_device *root) 310 { 311 int i, c; 312 struct eisa_device *edev; 313 char *enabled_str; 314 315 dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr); 316 317 /* First try to get hold of slot 0. If there is no device 318 * here, simply fail, unless root->force_probe is set. */ 319 320 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 321 if (!edev) 322 return -ENOMEM; 323 324 if (eisa_request_resources(root, edev, 0)) { 325 dev_warn(root->dev, 326 "EISA: Cannot allocate resource for mainboard\n"); 327 kfree(edev); 328 if (!root->force_probe) 329 return -EBUSY; 330 goto force_probe; 331 } 332 333 if (eisa_init_device(root, edev, 0)) { 334 eisa_release_resources(edev); 335 kfree(edev); 336 if (!root->force_probe) 337 return -ENODEV; 338 goto force_probe; 339 } 340 341 dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig); 342 343 if (eisa_register_device(edev)) { 344 dev_err(&edev->dev, "EISA: Failed to register %s\n", 345 edev->id.sig); 346 eisa_release_resources(edev); 347 kfree(edev); 348 } 349 350 force_probe: 351 352 for (c = 0, i = 1; i <= root->slots; i++) { 353 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 354 if (!edev) { 355 dev_err(root->dev, "EISA: Out of memory for slot %d\n", 356 i); 357 continue; 358 } 359 360 if (eisa_request_resources(root, edev, i)) { 361 dev_warn(root->dev, 362 "Cannot allocate resource for EISA slot %d\n", 363 i); 364 kfree(edev); 365 continue; 366 } 367 368 if (eisa_init_device(root, edev, i)) { 369 eisa_release_resources(edev); 370 kfree(edev); 371 continue; 372 } 373 374 if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED)) 375 enabled_str = " (forced enabled)"; 376 else if (edev->state == EISA_CONFIG_FORCED) 377 enabled_str = " (forced disabled)"; 378 else if (edev->state == 0) 379 enabled_str = " (disabled)"; 380 else 381 enabled_str = ""; 382 383 dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i, 384 edev->id.sig, enabled_str); 385 386 c++; 387 388 if (eisa_register_device(edev)) { 389 dev_err(&edev->dev, "EISA: Failed to register %s\n", 390 edev->id.sig); 391 eisa_release_resources(edev); 392 kfree(edev); 393 } 394 } 395 396 dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s"); 397 return 0; 398 } 399 400 static struct resource eisa_root_res = { 401 .name = "EISA root resource", 402 .start = 0, 403 .end = 0xffffffff, 404 .flags = IORESOURCE_IO, 405 }; 406 407 static int eisa_bus_count; 408 409 int __init eisa_root_register(struct eisa_root_device *root) 410 { 411 int err; 412 413 /* Use our own resources to check if this bus base address has 414 * been already registered. This prevents the virtual root 415 * device from registering after the real one has, for 416 * example... */ 417 418 root->eisa_root_res.name = eisa_root_res.name; 419 root->eisa_root_res.start = root->res->start; 420 root->eisa_root_res.end = root->res->end; 421 root->eisa_root_res.flags = IORESOURCE_BUSY; 422 423 err = request_resource(&eisa_root_res, &root->eisa_root_res); 424 if (err) 425 return err; 426 427 root->bus_nr = eisa_bus_count++; 428 429 err = eisa_probe(root); 430 if (err) 431 release_resource(&root->eisa_root_res); 432 433 return err; 434 } 435 436 static int __init eisa_init(void) 437 { 438 int r; 439 440 r = bus_register(&eisa_bus_type); 441 if (r) 442 return r; 443 444 printk(KERN_INFO "EISA bus registered\n"); 445 return 0; 446 } 447 448 module_param_array(enable_dev, int, &enable_dev_count, 0444); 449 module_param_array(disable_dev, int, &disable_dev_count, 0444); 450 451 postcore_initcall(eisa_init); 452 453 int EISA_bus; /* for legacy drivers */ 454 EXPORT_SYMBOL(EISA_bus); 455