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 }; 144 145 int eisa_driver_register (struct eisa_driver *edrv) 146 { 147 edrv->driver.bus = &eisa_bus_type; 148 return driver_register (&edrv->driver); 149 } 150 151 void eisa_driver_unregister (struct eisa_driver *edrv) 152 { 153 driver_unregister (&edrv->driver); 154 } 155 156 static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf) 157 { 158 struct eisa_device *edev = to_eisa_device (dev); 159 return sprintf (buf,"%s\n", edev->id.sig); 160 } 161 162 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL); 163 164 static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf) 165 { 166 struct eisa_device *edev = to_eisa_device (dev); 167 return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED); 168 } 169 170 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL); 171 172 static ssize_t eisa_show_modalias (struct device *dev, struct device_attribute *attr, char *buf) 173 { 174 struct eisa_device *edev = to_eisa_device (dev); 175 return sprintf (buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig); 176 } 177 178 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL); 179 180 static int __init eisa_init_device (struct eisa_root_device *root, 181 struct eisa_device *edev, 182 int slot) 183 { 184 char *sig; 185 unsigned long sig_addr; 186 int i; 187 188 sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET; 189 190 if (!(sig = decode_eisa_sig (sig_addr))) 191 return -1; /* No EISA device here */ 192 193 memcpy (edev->id.sig, sig, EISA_SIG_LEN); 194 edev->slot = slot; 195 edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED; 196 edev->base_addr = SLOT_ADDRESS (root, slot); 197 edev->dma_mask = root->dma_mask; /* Default DMA mask */ 198 eisa_name_device (edev); 199 edev->dev.parent = root->dev; 200 edev->dev.bus = &eisa_bus_type; 201 edev->dev.dma_mask = &edev->dma_mask; 202 edev->dev.coherent_dma_mask = edev->dma_mask; 203 sprintf (edev->dev.bus_id, "%02X:%02X", root->bus_nr, slot); 204 205 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 206 #ifdef CONFIG_EISA_NAMES 207 edev->res[i].name = edev->pretty_name; 208 #else 209 edev->res[i].name = edev->id.sig; 210 #endif 211 } 212 213 if (is_forced_dev (enable_dev, enable_dev_count, root, edev)) 214 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED; 215 216 if (is_forced_dev (disable_dev, disable_dev_count, root, edev)) 217 edev->state = EISA_CONFIG_FORCED; 218 219 return 0; 220 } 221 222 static int __init eisa_register_device (struct eisa_device *edev) 223 { 224 int rc = device_register (&edev->dev); 225 if (rc) 226 return rc; 227 228 rc = device_create_file (&edev->dev, &dev_attr_signature); 229 if (rc) goto err_devreg; 230 rc = device_create_file (&edev->dev, &dev_attr_enabled); 231 if (rc) goto err_sig; 232 rc = device_create_file (&edev->dev, &dev_attr_modalias); 233 if (rc) goto err_enab; 234 235 return 0; 236 237 err_enab: 238 device_remove_file (&edev->dev, &dev_attr_enabled); 239 err_sig: 240 device_remove_file (&edev->dev, &dev_attr_signature); 241 err_devreg: 242 device_unregister(&edev->dev); 243 return rc; 244 } 245 246 static int __init eisa_request_resources (struct eisa_root_device *root, 247 struct eisa_device *edev, 248 int slot) 249 { 250 int i; 251 252 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 253 /* Don't register resource for slot 0, since this is 254 * very likely to fail... :-( Instead, grab the EISA 255 * id, now we can display something in /proc/ioports. 256 */ 257 258 /* Only one region for mainboard */ 259 if (!slot && i > 0) { 260 edev->res[i].start = edev->res[i].end = 0; 261 continue; 262 } 263 264 if (slot) { 265 edev->res[i].name = NULL; 266 edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400); 267 edev->res[i].end = edev->res[i].start + 0xff; 268 edev->res[i].flags = IORESOURCE_IO; 269 } else { 270 edev->res[i].name = NULL; 271 edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET; 272 edev->res[i].end = edev->res[i].start + 3; 273 edev->res[i].flags = IORESOURCE_BUSY; 274 } 275 276 if (request_resource (root->res, &edev->res[i])) 277 goto failed; 278 } 279 280 return 0; 281 282 failed: 283 while (--i >= 0) 284 release_resource (&edev->res[i]); 285 286 return -1; 287 } 288 289 static void __init eisa_release_resources (struct eisa_device *edev) 290 { 291 int i; 292 293 for (i = 0; i < EISA_MAX_RESOURCES; i++) 294 if (edev->res[i].start || edev->res[i].end) 295 release_resource (&edev->res[i]); 296 } 297 298 static int __init eisa_probe (struct eisa_root_device *root) 299 { 300 int i, c; 301 struct eisa_device *edev; 302 303 printk (KERN_INFO "EISA: Probing bus %d at %s\n", 304 root->bus_nr, root->dev->bus_id); 305 306 /* First try to get hold of slot 0. If there is no device 307 * here, simply fail, unless root->force_probe is set. */ 308 309 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) { 310 printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n"); 311 return -ENOMEM; 312 } 313 314 if (eisa_request_resources (root, edev, 0)) { 315 printk (KERN_WARNING \ 316 "EISA: Cannot allocate resource for mainboard\n"); 317 kfree (edev); 318 if (!root->force_probe) 319 return -EBUSY; 320 goto force_probe; 321 } 322 323 if (eisa_init_device (root, edev, 0)) { 324 eisa_release_resources (edev); 325 kfree (edev); 326 if (!root->force_probe) 327 return -ENODEV; 328 goto force_probe; 329 } 330 331 printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig); 332 333 if (eisa_register_device (edev)) { 334 printk (KERN_ERR "EISA: Failed to register %s\n", 335 edev->id.sig); 336 eisa_release_resources (edev); 337 kfree (edev); 338 } 339 340 force_probe: 341 342 for (c = 0, i = 1; i <= root->slots; i++) { 343 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) { 344 printk (KERN_ERR "EISA: Out of memory for slot %d\n", 345 i); 346 continue; 347 } 348 349 if (eisa_request_resources (root, edev, i)) { 350 printk (KERN_WARNING \ 351 "Cannot allocate resource for EISA slot %d\n", 352 i); 353 kfree (edev); 354 continue; 355 } 356 357 if (eisa_init_device (root, edev, i)) { 358 eisa_release_resources (edev); 359 kfree (edev); 360 continue; 361 } 362 363 printk (KERN_INFO "EISA: slot %d : %s detected", 364 i, edev->id.sig); 365 366 switch (edev->state) { 367 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED: 368 printk (" (forced enabled)"); 369 break; 370 371 case EISA_CONFIG_FORCED: 372 printk (" (forced disabled)"); 373 break; 374 375 case 0: 376 printk (" (disabled)"); 377 break; 378 } 379 380 printk (".\n"); 381 382 c++; 383 384 if (eisa_register_device (edev)) { 385 printk (KERN_ERR "EISA: Failed to register %s\n", 386 edev->id.sig); 387 eisa_release_resources (edev); 388 kfree (edev); 389 } 390 } 391 392 printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s"); 393 394 return 0; 395 } 396 397 static struct resource eisa_root_res = { 398 .name = "EISA root resource", 399 .start = 0, 400 .end = 0xffffffff, 401 .flags = IORESOURCE_IO, 402 }; 403 404 static int eisa_bus_count; 405 406 int __init eisa_root_register (struct eisa_root_device *root) 407 { 408 int err; 409 410 /* Use our own resources to check if this bus base address has 411 * been already registered. This prevents the virtual root 412 * device from registering after the real one has, for 413 * example... */ 414 415 root->eisa_root_res.name = eisa_root_res.name; 416 root->eisa_root_res.start = root->res->start; 417 root->eisa_root_res.end = root->res->end; 418 root->eisa_root_res.flags = IORESOURCE_BUSY; 419 420 if ((err = request_resource (&eisa_root_res, &root->eisa_root_res))) 421 return err; 422 423 root->bus_nr = eisa_bus_count++; 424 425 if ((err = eisa_probe (root))) 426 release_resource (&root->eisa_root_res); 427 428 return err; 429 } 430 431 static int __init eisa_init (void) 432 { 433 int r; 434 435 if ((r = bus_register (&eisa_bus_type))) 436 return r; 437 438 printk (KERN_INFO "EISA bus registered\n"); 439 return 0; 440 } 441 442 module_param_array(enable_dev, int, &enable_dev_count, 0444); 443 module_param_array(disable_dev, int, &disable_dev_count, 0444); 444 445 postcore_initcall (eisa_init); 446 447 int EISA_bus; /* for legacy drivers */ 448 EXPORT_SYMBOL (EISA_bus); 449 EXPORT_SYMBOL (eisa_bus_type); 450 EXPORT_SYMBOL (eisa_driver_register); 451 EXPORT_SYMBOL (eisa_driver_unregister); 452