drivers/pnp/manager.c

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