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