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