Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Yani Ioannou | 74880c0 | 2005-05-17 06:41:12 -0400 | [diff] [blame] | 152 | static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Yani Ioannou | 74880c0 | 2005-05-17 06:41:12 -0400 | [diff] [blame] | 160 | static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Deepak Saxena | 8ac5436 | 2005-11-07 01:01:23 -0800 | [diff] [blame] | 284 | if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n"); |
| 286 | return -ENOMEM; |
| 287 | } |
| 288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | if (eisa_request_resources (root, edev, 0)) { |
| 290 | printk (KERN_WARNING \ |
| 291 | "EISA: Cannot allocate resource for mainboard\n"); |
| 292 | kfree (edev); |
| 293 | if (!root->force_probe) |
| 294 | return -EBUSY; |
| 295 | goto force_probe; |
| 296 | } |
| 297 | |
| 298 | if (eisa_init_device (root, edev, 0)) { |
| 299 | eisa_release_resources (edev); |
| 300 | kfree (edev); |
| 301 | if (!root->force_probe) |
| 302 | return -ENODEV; |
| 303 | goto force_probe; |
| 304 | } |
| 305 | |
| 306 | printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig); |
| 307 | |
| 308 | if (eisa_register_device (edev)) { |
| 309 | printk (KERN_ERR "EISA: Failed to register %s\n", |
| 310 | edev->id.sig); |
| 311 | eisa_release_resources (edev); |
| 312 | kfree (edev); |
| 313 | } |
| 314 | |
| 315 | force_probe: |
| 316 | |
| 317 | for (c = 0, i = 1; i <= root->slots; i++) { |
Deepak Saxena | 8ac5436 | 2005-11-07 01:01:23 -0800 | [diff] [blame] | 318 | if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | printk (KERN_ERR "EISA: Out of memory for slot %d\n", |
| 320 | i); |
| 321 | continue; |
| 322 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | if (eisa_request_resources (root, edev, i)) { |
| 325 | printk (KERN_WARNING \ |
| 326 | "Cannot allocate resource for EISA slot %d\n", |
| 327 | i); |
| 328 | kfree (edev); |
| 329 | continue; |
| 330 | } |
| 331 | |
| 332 | if (eisa_init_device (root, edev, i)) { |
| 333 | eisa_release_resources (edev); |
| 334 | kfree (edev); |
| 335 | continue; |
| 336 | } |
| 337 | |
| 338 | printk (KERN_INFO "EISA: slot %d : %s detected", |
| 339 | i, edev->id.sig); |
| 340 | |
| 341 | switch (edev->state) { |
| 342 | case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED: |
| 343 | printk (" (forced enabled)"); |
| 344 | break; |
| 345 | |
| 346 | case EISA_CONFIG_FORCED: |
| 347 | printk (" (forced disabled)"); |
| 348 | break; |
| 349 | |
| 350 | case 0: |
| 351 | printk (" (disabled)"); |
| 352 | break; |
| 353 | } |
| 354 | |
| 355 | printk (".\n"); |
| 356 | |
| 357 | c++; |
| 358 | |
| 359 | if (eisa_register_device (edev)) { |
| 360 | printk (KERN_ERR "EISA: Failed to register %s\n", |
| 361 | edev->id.sig); |
| 362 | eisa_release_resources (edev); |
| 363 | kfree (edev); |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s"); |
| 368 | |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | static struct resource eisa_root_res = { |
| 373 | .name = "EISA root resource", |
| 374 | .start = 0, |
| 375 | .end = 0xffffffff, |
| 376 | .flags = IORESOURCE_IO, |
| 377 | }; |
| 378 | |
| 379 | static int eisa_bus_count; |
| 380 | |
| 381 | int __init eisa_root_register (struct eisa_root_device *root) |
| 382 | { |
| 383 | int err; |
| 384 | |
| 385 | /* Use our own resources to check if this bus base address has |
| 386 | * been already registered. This prevents the virtual root |
| 387 | * device from registering after the real one has, for |
| 388 | * example... */ |
| 389 | |
| 390 | root->eisa_root_res.name = eisa_root_res.name; |
| 391 | root->eisa_root_res.start = root->res->start; |
| 392 | root->eisa_root_res.end = root->res->end; |
| 393 | root->eisa_root_res.flags = IORESOURCE_BUSY; |
| 394 | |
| 395 | if ((err = request_resource (&eisa_root_res, &root->eisa_root_res))) |
| 396 | return err; |
| 397 | |
| 398 | root->bus_nr = eisa_bus_count++; |
| 399 | |
| 400 | if ((err = eisa_probe (root))) |
| 401 | release_resource (&root->eisa_root_res); |
| 402 | |
| 403 | return err; |
| 404 | } |
| 405 | |
| 406 | static int __init eisa_init (void) |
| 407 | { |
| 408 | int r; |
| 409 | |
| 410 | if ((r = bus_register (&eisa_bus_type))) |
| 411 | return r; |
| 412 | |
| 413 | printk (KERN_INFO "EISA bus registered\n"); |
| 414 | return 0; |
| 415 | } |
| 416 | |
| 417 | module_param_array(enable_dev, int, &enable_dev_count, 0444); |
| 418 | module_param_array(disable_dev, int, &disable_dev_count, 0444); |
| 419 | |
| 420 | postcore_initcall (eisa_init); |
| 421 | |
| 422 | int EISA_bus; /* for legacy drivers */ |
| 423 | EXPORT_SYMBOL (EISA_bus); |
| 424 | EXPORT_SYMBOL (eisa_bus_type); |
| 425 | EXPORT_SYMBOL (eisa_driver_register); |
| 426 | EXPORT_SYMBOL (eisa_driver_unregister); |