| 1 | /* |
| 2 | * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices |
| 3 | * |
| 4 | * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz> |
| 5 | * Copyright 2003 Adam Belay <ambx1@neo.rr.com> |
| 6 | * Copyright (C) 2008 Hewlett-Packard Development Company, L.P. |
| 7 | * Bjorn Helgaas <bjorn.helgaas@hp.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/pnp.h> |
| 15 | #include <linux/bitmap.h> |
| 16 | #include <linux/mutex.h> |
| 17 | #include "base.h" |
| 18 | |
| 19 | DEFINE_MUTEX(pnp_res_mutex); |
| 20 | |
| 21 | static struct resource *pnp_find_resource(struct pnp_dev *dev, |
| 22 | unsigned char rule, |
| 23 | unsigned long type, |
| 24 | unsigned int bar) |
| 25 | { |
| 26 | struct resource *res = pnp_get_resource(dev, type, bar); |
| 27 | |
| 28 | /* when the resource already exists, set its resource bits from rule */ |
| 29 | if (res) { |
| 30 | res->flags &= ~IORESOURCE_BITS; |
| 31 | res->flags |= rule & IORESOURCE_BITS; |
| 32 | } |
| 33 | |
| 34 | return res; |
| 35 | } |
| 36 | |
| 37 | static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx) |
| 38 | { |
| 39 | struct resource *res, local_res; |
| 40 | |
| 41 | res = pnp_find_resource(dev, rule->flags, IORESOURCE_IO, idx); |
| 42 | if (res) { |
| 43 | pnp_dbg(&dev->dev, " io %d already set to %#llx-%#llx " |
| 44 | "flags %#lx\n", idx, (unsigned long long) res->start, |
| 45 | (unsigned long long) res->end, res->flags); |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | res = &local_res; |
| 50 | res->flags = rule->flags | IORESOURCE_AUTO; |
| 51 | res->start = 0; |
| 52 | res->end = 0; |
| 53 | |
| 54 | if (!rule->size) { |
| 55 | res->flags |= IORESOURCE_DISABLED; |
| 56 | pnp_dbg(&dev->dev, " io %d disabled\n", idx); |
| 57 | goto __add; |
| 58 | } |
| 59 | |
| 60 | res->start = rule->min; |
| 61 | res->end = res->start + rule->size - 1; |
| 62 | |
| 63 | while (!pnp_check_port(dev, res)) { |
| 64 | res->start += rule->align; |
| 65 | res->end = res->start + rule->size - 1; |
| 66 | if (res->start > rule->max || !rule->align) { |
| 67 | pnp_dbg(&dev->dev, " couldn't assign io %d " |
| 68 | "(min %#llx max %#llx)\n", idx, |
| 69 | (unsigned long long) rule->min, |
| 70 | (unsigned long long) rule->max); |
| 71 | return -EBUSY; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | __add: |
| 76 | pnp_add_io_resource(dev, res->start, res->end, res->flags); |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx) |
| 81 | { |
| 82 | struct resource *res, local_res; |
| 83 | |
| 84 | res = pnp_find_resource(dev, rule->flags, IORESOURCE_MEM, idx); |
| 85 | if (res) { |
| 86 | pnp_dbg(&dev->dev, " mem %d already set to %#llx-%#llx " |
| 87 | "flags %#lx\n", idx, (unsigned long long) res->start, |
| 88 | (unsigned long long) res->end, res->flags); |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | res = &local_res; |
| 93 | res->flags = rule->flags | IORESOURCE_AUTO; |
| 94 | res->start = 0; |
| 95 | res->end = 0; |
| 96 | |
| 97 | /* ??? rule->flags restricted to 8 bits, all tests bogus ??? */ |
| 98 | if (!(rule->flags & IORESOURCE_MEM_WRITEABLE)) |
| 99 | res->flags |= IORESOURCE_READONLY; |
| 100 | if (rule->flags & IORESOURCE_MEM_RANGELENGTH) |
| 101 | res->flags |= IORESOURCE_RANGELENGTH; |
| 102 | if (rule->flags & IORESOURCE_MEM_SHADOWABLE) |
| 103 | res->flags |= IORESOURCE_SHADOWABLE; |
| 104 | |
| 105 | if (!rule->size) { |
| 106 | res->flags |= IORESOURCE_DISABLED; |
| 107 | pnp_dbg(&dev->dev, " mem %d disabled\n", idx); |
| 108 | goto __add; |
| 109 | } |
| 110 | |
| 111 | res->start = rule->min; |
| 112 | res->end = res->start + rule->size - 1; |
| 113 | |
| 114 | while (!pnp_check_mem(dev, res)) { |
| 115 | res->start += rule->align; |
| 116 | res->end = res->start + rule->size - 1; |
| 117 | if (res->start > rule->max || !rule->align) { |
| 118 | pnp_dbg(&dev->dev, " couldn't assign mem %d " |
| 119 | "(min %#llx max %#llx)\n", idx, |
| 120 | (unsigned long long) rule->min, |
| 121 | (unsigned long long) rule->max); |
| 122 | return -EBUSY; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | __add: |
| 127 | pnp_add_mem_resource(dev, res->start, res->end, res->flags); |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx) |
| 132 | { |
| 133 | struct resource *res, local_res; |
| 134 | int i; |
| 135 | |
| 136 | /* IRQ priority: this table is good for i386 */ |
| 137 | static unsigned short xtab[16] = { |
| 138 | 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2 |
| 139 | }; |
| 140 | |
| 141 | res = pnp_find_resource(dev, rule->flags, IORESOURCE_IRQ, idx); |
| 142 | if (res) { |
| 143 | pnp_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n", |
| 144 | idx, (int) res->start, res->flags); |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | res = &local_res; |
| 149 | res->flags = rule->flags | IORESOURCE_AUTO; |
| 150 | res->start = -1; |
| 151 | res->end = -1; |
| 152 | |
| 153 | if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) { |
| 154 | res->flags |= IORESOURCE_DISABLED; |
| 155 | pnp_dbg(&dev->dev, " irq %d disabled\n", idx); |
| 156 | goto __add; |
| 157 | } |
| 158 | |
| 159 | /* TBD: need check for >16 IRQ */ |
| 160 | res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16); |
| 161 | if (res->start < PNP_IRQ_NR) { |
| 162 | res->end = res->start; |
| 163 | goto __add; |
| 164 | } |
| 165 | for (i = 0; i < 16; i++) { |
| 166 | if (test_bit(xtab[i], rule->map.bits)) { |
| 167 | res->start = res->end = xtab[i]; |
| 168 | if (pnp_check_irq(dev, res)) |
| 169 | goto __add; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | if (rule->flags & IORESOURCE_IRQ_OPTIONAL) { |
| 174 | res->start = -1; |
| 175 | res->end = -1; |
| 176 | res->flags |= IORESOURCE_DISABLED; |
| 177 | pnp_dbg(&dev->dev, " irq %d disabled (optional)\n", idx); |
| 178 | goto __add; |
| 179 | } |
| 180 | |
| 181 | pnp_dbg(&dev->dev, " couldn't assign irq %d\n", idx); |
| 182 | return -EBUSY; |
| 183 | |
| 184 | __add: |
| 185 | pnp_add_irq_resource(dev, res->start, res->flags); |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | #ifdef CONFIG_ISA_DMA_API |
| 190 | static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx) |
| 191 | { |
| 192 | struct resource *res, local_res; |
| 193 | int i; |
| 194 | |
| 195 | /* DMA priority: this table is good for i386 */ |
| 196 | static unsigned short xtab[8] = { |
| 197 | 1, 3, 5, 6, 7, 0, 2, 4 |
| 198 | }; |
| 199 | |
| 200 | res = pnp_find_resource(dev, rule->flags, IORESOURCE_DMA, idx); |
| 201 | if (res) { |
| 202 | pnp_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n", |
| 203 | idx, (int) res->start, res->flags); |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | res = &local_res; |
| 208 | res->flags = rule->flags | IORESOURCE_AUTO; |
| 209 | res->start = -1; |
| 210 | res->end = -1; |
| 211 | |
| 212 | if (!rule->map) { |
| 213 | res->flags |= IORESOURCE_DISABLED; |
| 214 | pnp_dbg(&dev->dev, " dma %d disabled\n", idx); |
| 215 | goto __add; |
| 216 | } |
| 217 | |
| 218 | for (i = 0; i < 8; i++) { |
| 219 | if (rule->map & (1 << xtab[i])) { |
| 220 | res->start = res->end = xtab[i]; |
| 221 | if (pnp_check_dma(dev, res)) |
| 222 | goto __add; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | pnp_dbg(&dev->dev, " couldn't assign dma %d\n", idx); |
| 227 | return -EBUSY; |
| 228 | |
| 229 | __add: |
| 230 | pnp_add_dma_resource(dev, res->start, res->flags); |
| 231 | return 0; |
| 232 | } |
| 233 | #endif /* CONFIG_ISA_DMA_API */ |
| 234 | |
| 235 | void pnp_init_resources(struct pnp_dev *dev) |
| 236 | { |
| 237 | pnp_free_resources(dev); |
| 238 | } |
| 239 | |
| 240 | static void pnp_clean_resource_table(struct pnp_dev *dev) |
| 241 | { |
| 242 | struct pnp_resource *pnp_res, *tmp; |
| 243 | |
| 244 | list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) { |
| 245 | if (pnp_res->res.flags & IORESOURCE_AUTO) |
| 246 | pnp_free_resource(pnp_res); |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | /** |
| 251 | * pnp_assign_resources - assigns resources to the device based on the specified dependent number |
| 252 | * @dev: pointer to the desired device |
| 253 | * @set: the dependent function number |
| 254 | */ |
| 255 | static int pnp_assign_resources(struct pnp_dev *dev, int set) |
| 256 | { |
| 257 | struct pnp_option *option; |
| 258 | int nport = 0, nmem = 0, nirq = 0; |
| 259 | int ndma __maybe_unused = 0; |
| 260 | int ret = 0; |
| 261 | |
| 262 | pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set); |
| 263 | mutex_lock(&pnp_res_mutex); |
| 264 | pnp_clean_resource_table(dev); |
| 265 | |
| 266 | list_for_each_entry(option, &dev->options, list) { |
| 267 | if (pnp_option_is_dependent(option) && |
| 268 | pnp_option_set(option) != set) |
| 269 | continue; |
| 270 | |
| 271 | switch (option->type) { |
| 272 | case IORESOURCE_IO: |
| 273 | ret = pnp_assign_port(dev, &option->u.port, nport++); |
| 274 | break; |
| 275 | case IORESOURCE_MEM: |
| 276 | ret = pnp_assign_mem(dev, &option->u.mem, nmem++); |
| 277 | break; |
| 278 | case IORESOURCE_IRQ: |
| 279 | ret = pnp_assign_irq(dev, &option->u.irq, nirq++); |
| 280 | break; |
| 281 | #ifdef CONFIG_ISA_DMA_API |
| 282 | case IORESOURCE_DMA: |
| 283 | ret = pnp_assign_dma(dev, &option->u.dma, ndma++); |
| 284 | break; |
| 285 | #endif |
| 286 | default: |
| 287 | ret = -EINVAL; |
| 288 | break; |
| 289 | } |
| 290 | if (ret < 0) |
| 291 | break; |
| 292 | } |
| 293 | |
| 294 | mutex_unlock(&pnp_res_mutex); |
| 295 | if (ret < 0) { |
| 296 | pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret); |
| 297 | pnp_clean_resource_table(dev); |
| 298 | } else |
| 299 | dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded"); |
| 300 | return ret; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * pnp_auto_config_dev - automatically assigns resources to a device |
| 305 | * @dev: pointer to the desired device |
| 306 | */ |
| 307 | int pnp_auto_config_dev(struct pnp_dev *dev) |
| 308 | { |
| 309 | int i, ret; |
| 310 | |
| 311 | if (!pnp_can_configure(dev)) { |
| 312 | pnp_dbg(&dev->dev, "configuration not supported\n"); |
| 313 | return -ENODEV; |
| 314 | } |
| 315 | |
| 316 | ret = pnp_assign_resources(dev, 0); |
| 317 | if (ret == 0) |
| 318 | return 0; |
| 319 | |
| 320 | for (i = 1; i < dev->num_dependent_sets; i++) { |
| 321 | ret = pnp_assign_resources(dev, i); |
| 322 | if (ret == 0) |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | dev_err(&dev->dev, "unable to assign resources\n"); |
| 327 | return ret; |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * pnp_start_dev - low-level start of the PnP device |
| 332 | * @dev: pointer to the desired device |
| 333 | * |
| 334 | * assumes that resources have already been allocated |
| 335 | */ |
| 336 | int pnp_start_dev(struct pnp_dev *dev) |
| 337 | { |
| 338 | if (!pnp_can_write(dev)) { |
| 339 | pnp_dbg(&dev->dev, "activation not supported\n"); |
| 340 | return -EINVAL; |
| 341 | } |
| 342 | |
| 343 | dbg_pnp_show_resources(dev, "pnp_start_dev"); |
| 344 | if (dev->protocol->set(dev) < 0) { |
| 345 | dev_err(&dev->dev, "activation failed\n"); |
| 346 | return -EIO; |
| 347 | } |
| 348 | |
| 349 | dev_info(&dev->dev, "activated\n"); |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * pnp_stop_dev - low-level disable of the PnP device |
| 355 | * @dev: pointer to the desired device |
| 356 | * |
| 357 | * does not free resources |
| 358 | */ |
| 359 | int pnp_stop_dev(struct pnp_dev *dev) |
| 360 | { |
| 361 | if (!pnp_can_disable(dev)) { |
| 362 | pnp_dbg(&dev->dev, "disabling not supported\n"); |
| 363 | return -EINVAL; |
| 364 | } |
| 365 | if (dev->protocol->disable(dev) < 0) { |
| 366 | dev_err(&dev->dev, "disable failed\n"); |
| 367 | return -EIO; |
| 368 | } |
| 369 | |
| 370 | dev_info(&dev->dev, "disabled\n"); |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | /** |
| 375 | * pnp_activate_dev - activates a PnP device for use |
| 376 | * @dev: pointer to the desired device |
| 377 | * |
| 378 | * does not validate or set resources so be careful. |
| 379 | */ |
| 380 | int pnp_activate_dev(struct pnp_dev *dev) |
| 381 | { |
| 382 | int error; |
| 383 | |
| 384 | if (dev->active) |
| 385 | return 0; |
| 386 | |
| 387 | /* ensure resources are allocated */ |
| 388 | if (pnp_auto_config_dev(dev)) |
| 389 | return -EBUSY; |
| 390 | |
| 391 | error = pnp_start_dev(dev); |
| 392 | if (error) |
| 393 | return error; |
| 394 | |
| 395 | dev->active = 1; |
| 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * pnp_disable_dev - disables device |
| 401 | * @dev: pointer to the desired device |
| 402 | * |
| 403 | * inform the correct pnp protocol so that resources can be used by other devices |
| 404 | */ |
| 405 | int pnp_disable_dev(struct pnp_dev *dev) |
| 406 | { |
| 407 | int error; |
| 408 | |
| 409 | if (!dev->active) |
| 410 | return 0; |
| 411 | |
| 412 | error = pnp_stop_dev(dev); |
| 413 | if (error) |
| 414 | return error; |
| 415 | |
| 416 | dev->active = 0; |
| 417 | |
| 418 | /* release the resources so that other devices can use them */ |
| 419 | mutex_lock(&pnp_res_mutex); |
| 420 | pnp_clean_resource_table(dev); |
| 421 | mutex_unlock(&pnp_res_mutex); |
| 422 | |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | EXPORT_SYMBOL(pnp_start_dev); |
| 427 | EXPORT_SYMBOL(pnp_stop_dev); |
| 428 | EXPORT_SYMBOL(pnp_activate_dev); |
| 429 | EXPORT_SYMBOL(pnp_disable_dev); |