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[DEVICE_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 int enable_dev_count; 39 static int disable_dev[EISA_MAX_FORCED_DEV]; 40 static 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 DEVICE_NAME_SIZE); 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 struct bus_type eisa_bus_type = { 132 .name = "eisa", 133 .match = eisa_bus_match, 134 }; 135 136 int eisa_driver_register (struct eisa_driver *edrv) 137 { 138 int r; 139 140 edrv->driver.bus = &eisa_bus_type; 141 if ((r = driver_register (&edrv->driver)) < 0) 142 return r; 143 144 return 0; 145 } 146 147 void eisa_driver_unregister (struct eisa_driver *edrv) 148 { 149 driver_unregister (&edrv->driver); 150 } 151 152 static ssize_t eisa_show_sig (struct device *dev, char *buf) 153 { 154 struct eisa_device *edev = to_eisa_device (dev); 155 return sprintf (buf,"%s\n", edev->id.sig); 156 } 157 158 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL); 159 160 static ssize_t eisa_show_state (struct device *dev, char *buf) 161 { 162 struct eisa_device *edev = to_eisa_device (dev); 163 return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED); 164 } 165 166 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL); 167 168 static int __init eisa_init_device (struct eisa_root_device *root, 169 struct eisa_device *edev, 170 int slot) 171 { 172 char *sig; 173 unsigned long sig_addr; 174 int i; 175 176 sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET; 177 178 if (!(sig = decode_eisa_sig (sig_addr))) 179 return -1; /* No EISA device here */ 180 181 memcpy (edev->id.sig, sig, EISA_SIG_LEN); 182 edev->slot = slot; 183 edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED; 184 edev->base_addr = SLOT_ADDRESS (root, slot); 185 edev->dma_mask = root->dma_mask; /* Default DMA mask */ 186 eisa_name_device (edev); 187 edev->dev.parent = root->dev; 188 edev->dev.bus = &eisa_bus_type; 189 edev->dev.dma_mask = &edev->dma_mask; 190 edev->dev.coherent_dma_mask = edev->dma_mask; 191 sprintf (edev->dev.bus_id, "%02X:%02X", root->bus_nr, slot); 192 193 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 194 #ifdef CONFIG_EISA_NAMES 195 edev->res[i].name = edev->pretty_name; 196 #else 197 edev->res[i].name = edev->id.sig; 198 #endif 199 } 200 201 if (is_forced_dev (enable_dev, enable_dev_count, root, edev)) 202 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED; 203 204 if (is_forced_dev (disable_dev, disable_dev_count, root, edev)) 205 edev->state = EISA_CONFIG_FORCED; 206 207 return 0; 208 } 209 210 static int __init eisa_register_device (struct eisa_device *edev) 211 { 212 if (device_register (&edev->dev)) 213 return -1; 214 215 device_create_file (&edev->dev, &dev_attr_signature); 216 device_create_file (&edev->dev, &dev_attr_enabled); 217 218 return 0; 219 } 220 221 static int __init eisa_request_resources (struct eisa_root_device *root, 222 struct eisa_device *edev, 223 int slot) 224 { 225 int i; 226 227 for (i = 0; i < EISA_MAX_RESOURCES; i++) { 228 /* Don't register resource for slot 0, since this is 229 * very likely to fail... :-( Instead, grab the EISA 230 * id, now we can display something in /proc/ioports. 231 */ 232 233 /* Only one region for mainboard */ 234 if (!slot && i > 0) { 235 edev->res[i].start = edev->res[i].end = 0; 236 continue; 237 } 238 239 if (slot) { 240 edev->res[i].name = NULL; 241 edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400); 242 edev->res[i].end = edev->res[i].start + 0xff; 243 edev->res[i].flags = IORESOURCE_IO; 244 } else { 245 edev->res[i].name = NULL; 246 edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET; 247 edev->res[i].end = edev->res[i].start + 3; 248 edev->res[i].flags = IORESOURCE_BUSY; 249 } 250 251 if (request_resource (root->res, &edev->res[i])) 252 goto failed; 253 } 254 255 return 0; 256 257 failed: 258 while (--i >= 0) 259 release_resource (&edev->res[i]); 260 261 return -1; 262 } 263 264 static void __init eisa_release_resources (struct eisa_device *edev) 265 { 266 int i; 267 268 for (i = 0; i < EISA_MAX_RESOURCES; i++) 269 if (edev->res[i].start || edev->res[i].end) 270 release_resource (&edev->res[i]); 271 } 272 273 static int __init eisa_probe (struct eisa_root_device *root) 274 { 275 int i, c; 276 struct eisa_device *edev; 277 278 printk (KERN_INFO "EISA: Probing bus %d at %s\n", 279 root->bus_nr, root->dev->bus_id); 280 281 /* First try to get hold of slot 0. If there is no device 282 * here, simply fail, unless root->force_probe is set. */ 283 284 if (!(edev = kmalloc (sizeof (*edev), GFP_KERNEL))) { 285 printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n"); 286 return -ENOMEM; 287 } 288 289 memset (edev, 0, sizeof (*edev)); 290 291 if (eisa_request_resources (root, edev, 0)) { 292 printk (KERN_WARNING \ 293 "EISA: Cannot allocate resource for mainboard\n"); 294 kfree (edev); 295 if (!root->force_probe) 296 return -EBUSY; 297 goto force_probe; 298 } 299 300 if (eisa_init_device (root, edev, 0)) { 301 eisa_release_resources (edev); 302 kfree (edev); 303 if (!root->force_probe) 304 return -ENODEV; 305 goto force_probe; 306 } 307 308 printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig); 309 310 if (eisa_register_device (edev)) { 311 printk (KERN_ERR "EISA: Failed to register %s\n", 312 edev->id.sig); 313 eisa_release_resources (edev); 314 kfree (edev); 315 } 316 317 force_probe: 318 319 for (c = 0, i = 1; i <= root->slots; i++) { 320 if (!(edev = kmalloc (sizeof (*edev), GFP_KERNEL))) { 321 printk (KERN_ERR "EISA: Out of memory for slot %d\n", 322 i); 323 continue; 324 } 325 326 memset (edev, 0, sizeof (*edev)); 327 328 if (eisa_request_resources (root, edev, i)) { 329 printk (KERN_WARNING \ 330 "Cannot allocate resource for EISA slot %d\n", 331 i); 332 kfree (edev); 333 continue; 334 } 335 336 if (eisa_init_device (root, edev, i)) { 337 eisa_release_resources (edev); 338 kfree (edev); 339 continue; 340 } 341 342 printk (KERN_INFO "EISA: slot %d : %s detected", 343 i, edev->id.sig); 344 345 switch (edev->state) { 346 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED: 347 printk (" (forced enabled)"); 348 break; 349 350 case EISA_CONFIG_FORCED: 351 printk (" (forced disabled)"); 352 break; 353 354 case 0: 355 printk (" (disabled)"); 356 break; 357 } 358 359 printk (".\n"); 360 361 c++; 362 363 if (eisa_register_device (edev)) { 364 printk (KERN_ERR "EISA: Failed to register %s\n", 365 edev->id.sig); 366 eisa_release_resources (edev); 367 kfree (edev); 368 } 369 } 370 371 printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s"); 372 373 return 0; 374 } 375 376 static struct resource eisa_root_res = { 377 .name = "EISA root resource", 378 .start = 0, 379 .end = 0xffffffff, 380 .flags = IORESOURCE_IO, 381 }; 382 383 static int eisa_bus_count; 384 385 int __init eisa_root_register (struct eisa_root_device *root) 386 { 387 int err; 388 389 /* Use our own resources to check if this bus base address has 390 * been already registered. This prevents the virtual root 391 * device from registering after the real one has, for 392 * example... */ 393 394 root->eisa_root_res.name = eisa_root_res.name; 395 root->eisa_root_res.start = root->res->start; 396 root->eisa_root_res.end = root->res->end; 397 root->eisa_root_res.flags = IORESOURCE_BUSY; 398 399 if ((err = request_resource (&eisa_root_res, &root->eisa_root_res))) 400 return err; 401 402 root->bus_nr = eisa_bus_count++; 403 404 if ((err = eisa_probe (root))) 405 release_resource (&root->eisa_root_res); 406 407 return err; 408 } 409 410 static int __init eisa_init (void) 411 { 412 int r; 413 414 if ((r = bus_register (&eisa_bus_type))) 415 return r; 416 417 printk (KERN_INFO "EISA bus registered\n"); 418 return 0; 419 } 420 421 module_param_array(enable_dev, int, &enable_dev_count, 0444); 422 module_param_array(disable_dev, int, &disable_dev_count, 0444); 423 424 postcore_initcall (eisa_init); 425 426 int EISA_bus; /* for legacy drivers */ 427 EXPORT_SYMBOL (EISA_bus); 428 EXPORT_SYMBOL (eisa_bus_type); 429 EXPORT_SYMBOL (eisa_driver_register); 430 EXPORT_SYMBOL (eisa_driver_unregister); 431