drivers/eisa/eisa-bus.c

   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 static int eisa_bus_uevent(struct device *dev, char **envp, int num_envp,
 132                            char *buffer, int buffer_size)
 133 {
 134         struct eisa_device *edev = to_eisa_device(dev);
 135         int i = 0;
 136         int length = 0;
 137
 138         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
 139                        "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
 140         envp[i] = NULL;
 141         return 0;
 142 }
 143
 144 struct bus_type eisa_bus_type = {
 145         .name  = "eisa",
 146         .match = eisa_bus_match,
 147         .uevent = eisa_bus_uevent,
 148 };
 149
 150 int eisa_driver_register (struct eisa_driver *edrv)
 151 {
 152         edrv->driver.bus = &eisa_bus_type;
 153         return driver_register (&edrv->driver);
 154 }
 155
 156 void eisa_driver_unregister (struct eisa_driver *edrv)
 157 {
 158         driver_unregister (&edrv->driver);
 159 }
 160
 161 static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf)
 162 {
 163         struct eisa_device *edev = to_eisa_device (dev);
 164         return sprintf (buf,"%s\n", edev->id.sig);
 165 }
 166
 167 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
 168
 169 static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf)
 170 {
 171         struct eisa_device *edev = to_eisa_device (dev);
 172         return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED);
 173 }
 174
 175 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
 176
 177 static ssize_t eisa_show_modalias (struct device *dev, struct device_attribute *attr, char *buf)
 178 {
 179         struct eisa_device *edev = to_eisa_device (dev);
 180         return sprintf (buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
 181 }
 182
 183 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
 184
 185 static int __init eisa_init_device (struct eisa_root_device *root,
 186                                     struct eisa_device *edev,
 187                                     int slot)
 188 {
 189         char *sig;
 190         unsigned long sig_addr;
 191         int i;
 192
 193         sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
 194
 195         if (!(sig = decode_eisa_sig (sig_addr)))
 196                 return -1;      /* No EISA device here */
 197
 198         memcpy (edev->id.sig, sig, EISA_SIG_LEN);
 199         edev->slot = slot;
 200         edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED;
 201         edev->base_addr = SLOT_ADDRESS (root, slot);
 202         edev->dma_mask = root->dma_mask; /* Default DMA mask */
 203         eisa_name_device (edev);
 204         edev->dev.parent = root->dev;
 205         edev->dev.bus = &eisa_bus_type;
 206         edev->dev.dma_mask = &edev->dma_mask;
 207         edev->dev.coherent_dma_mask = edev->dma_mask;
 208         sprintf (edev->dev.bus_id, "%02X:%02X", root->bus_nr, slot);
 209
 210         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 211 #ifdef CONFIG_EISA_NAMES
 212                 edev->res[i].name = edev->pretty_name;
 213 #else
 214                 edev->res[i].name = edev->id.sig;
 215 #endif
 216         }
 217
 218         if (is_forced_dev (enable_dev, enable_dev_count, root, edev))
 219                 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
 220
 221         if (is_forced_dev (disable_dev, disable_dev_count, root, edev))
 222                 edev->state = EISA_CONFIG_FORCED;
 223
 224         return 0;
 225 }
 226
 227 static int __init eisa_register_device (struct eisa_device *edev)
 228 {
 229         if (device_register (&edev->dev))
 230                 return -1;
 231
 232         device_create_file (&edev->dev, &dev_attr_signature);
 233         device_create_file (&edev->dev, &dev_attr_enabled);
 234         device_create_file (&edev->dev, &dev_attr_modalias);
 235
 236         return 0;
 237 }
 238
 239 static int __init eisa_request_resources (struct eisa_root_device *root,
 240                                           struct eisa_device *edev,
 241                                           int slot)
 242 {
 243         int i;
 244
 245         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 246                 /* Don't register resource for slot 0, since this is
 247                  * very likely to fail... :-( Instead, grab the EISA
 248                  * id, now we can display something in /proc/ioports.
 249                  */
 250
 251                 /* Only one region for mainboard */
 252                 if (!slot && i > 0) {
 253                         edev->res[i].start = edev->res[i].end = 0;
 254                         continue;
 255                 }
 256
 257                 if (slot) {
 258                         edev->res[i].name  = NULL;
 259                         edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
 260                         edev->res[i].end   = edev->res[i].start + 0xff;
 261                         edev->res[i].flags = IORESOURCE_IO;
 262                 } else {
 263                         edev->res[i].name  = NULL;
 264                         edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
 265                         edev->res[i].end   = edev->res[i].start + 3;
 266                         edev->res[i].flags = IORESOURCE_BUSY;
 267                 }
 268
 269                 if (request_resource (root->res, &edev->res[i]))
 270                         goto failed;
 271         }
 272
 273         return 0;
 274
 275  failed:
 276         while (--i >= 0)
 277                 release_resource (&edev->res[i]);
 278
 279         return -1;
 280 }
 281
 282 static void __init eisa_release_resources (struct eisa_device *edev)
 283 {
 284         int i;
 285
 286         for (i = 0; i < EISA_MAX_RESOURCES; i++)
 287                 if (edev->res[i].start || edev->res[i].end)
 288                         release_resource (&edev->res[i]);
 289 }
 290
 291 static int __init eisa_probe (struct eisa_root_device *root)
 292 {
 293         int i, c;
 294         struct eisa_device *edev;
 295
 296         printk (KERN_INFO "EISA: Probing bus %d at %s\n",
 297                 root->bus_nr, root->dev->bus_id);
 298
 299         /* First try to get hold of slot 0. If there is no device
 300          * here, simply fail, unless root->force_probe is set. */
 301
 302         if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
 303                 printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
 304                 return -ENOMEM;
 305         }
 306
 307         if (eisa_request_resources (root, edev, 0)) {
 308                 printk (KERN_WARNING \
 309                         "EISA: Cannot allocate resource for mainboard\n");
 310                 kfree (edev);
 311                 if (!root->force_probe)
 312                         return -EBUSY;
 313                 goto force_probe;
 314         }
 315
 316         if (eisa_init_device (root, edev, 0)) {
 317                 eisa_release_resources (edev);
 318                 kfree (edev);
 319                 if (!root->force_probe)
 320                         return -ENODEV;
 321                 goto force_probe;
 322         }
 323
 324         printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);
 325
 326         if (eisa_register_device (edev)) {
 327                 printk (KERN_ERR "EISA: Failed to register %s\n",
 328                         edev->id.sig);
 329                 eisa_release_resources (edev);
 330                 kfree (edev);
 331         }
 332
 333  force_probe:
 334
 335         for (c = 0, i = 1; i <= root->slots; i++) {
 336                 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
 337                         printk (KERN_ERR "EISA: Out of memory for slot %d\n",
 338                                 i);
 339                         continue;
 340                 }
 341
 342                 if (eisa_request_resources (root, edev, i)) {
 343                         printk (KERN_WARNING \
 344                                 "Cannot allocate resource for EISA slot %d\n",
 345                                 i);
 346                         kfree (edev);
 347                         continue;
 348                 }
 349
 350                 if (eisa_init_device (root, edev, i)) {
 351                         eisa_release_resources (edev);
 352                         kfree (edev);
 353                         continue;
 354                 }
 355
 356                 printk (KERN_INFO "EISA: slot %d : %s detected",
 357                         i, edev->id.sig);
 358
 359                 switch (edev->state) {
 360                 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
 361                         printk (" (forced enabled)");
 362                         break;
 363
 364                 case EISA_CONFIG_FORCED:
 365                         printk (" (forced disabled)");
 366                         break;
 367
 368                 case 0:
 369                         printk (" (disabled)");
 370                         break;
 371                 }
 372
 373                 printk (".\n");
 374
 375                 c++;
 376
 377                 if (eisa_register_device (edev)) {
 378                         printk (KERN_ERR "EISA: Failed to register %s\n",
 379                                 edev->id.sig);
 380                         eisa_release_resources (edev);
 381                         kfree (edev);
 382                 }
 383         }
 384
 385         printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");
 386
 387         return 0;
 388 }
 389
 390 static struct resource eisa_root_res = {
 391         .name  = "EISA root resource",
 392         .start = 0,
 393         .end   = 0xffffffff,
 394         .flags = IORESOURCE_IO,
 395 };
 396
 397 static int eisa_bus_count;
 398
 399 int __init eisa_root_register (struct eisa_root_device *root)
 400 {
 401         int err;
 402
 403         /* Use our own resources to check if this bus base address has
 404          * been already registered. This prevents the virtual root
 405          * device from registering after the real one has, for
 406          * example... */
 407
 408         root->eisa_root_res.name  = eisa_root_res.name;
 409         root->eisa_root_res.start = root->res->start;
 410         root->eisa_root_res.end   = root->res->end;
 411         root->eisa_root_res.flags = IORESOURCE_BUSY;
 412
 413         if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
 414                 return err;
 415
 416         root->bus_nr = eisa_bus_count++;
 417
 418         if ((err = eisa_probe (root)))
 419                 release_resource (&root->eisa_root_res);
 420
 421         return err;
 422 }
 423
 424 static int __init eisa_init (void)
 425 {
 426         int r;
 427
 428         if ((r = bus_register (&eisa_bus_type)))
 429                 return r;
 430
 431         printk (KERN_INFO "EISA bus registered\n");
 432         return 0;
 433 }
 434
 435 module_param_array(enable_dev, int, &enable_dev_count, 0444);
 436 module_param_array(disable_dev, int, &disable_dev_count, 0444);
 437
 438 postcore_initcall (eisa_init);
 439
 440 int EISA_bus;           /* for legacy drivers */
 441 EXPORT_SYMBOL (EISA_bus);
 442 EXPORT_SYMBOL (eisa_bus_type);
 443 EXPORT_SYMBOL (eisa_driver_register);
 444 EXPORT_SYMBOL (eisa_driver_unregister);