drivers/eisa/eisa-bus.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * EISA bus support functions for sysfs.
   4  *
   5  * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/device.h>
  10 #include <linux/eisa.h>
  11 #include <linux/module.h>
  12 #include <linux/moduleparam.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/ioport.h>
  16 #include <asm/io.h>
  17
  18 #define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))
  19
  20 #define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }
  21
  22 struct eisa_device_info {
  23         struct eisa_device_id id;
  24         char name[50];
  25 };
  26
  27 #ifdef CONFIG_EISA_NAMES
  28 static struct eisa_device_info __initdata eisa_table[] = {
  29 #include "devlist.h"
  30 };
  31 #define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
  32 #endif
  33
  34 #define EISA_MAX_FORCED_DEV 16
  35
  36 static int enable_dev[EISA_MAX_FORCED_DEV];
  37 static unsigned int enable_dev_count;
  38 static int disable_dev[EISA_MAX_FORCED_DEV];
  39 static unsigned int disable_dev_count;
  40
  41 static int is_forced_dev(int *forced_tab,
  42                          int forced_count,
  43                          struct eisa_root_device *root,
  44                          struct eisa_device *edev)
  45 {
  46         int i, x;
  47
  48         for (i = 0; i < forced_count; i++) {
  49                 x = (root->bus_nr << 8) | edev->slot;
  50                 if (forced_tab[i] == x)
  51                         return 1;
  52         }
  53
  54         return 0;
  55 }
  56
  57 static void __init eisa_name_device(struct eisa_device *edev)
  58 {
  59 #ifdef CONFIG_EISA_NAMES
  60         int i;
  61         for (i = 0; i < EISA_INFOS; i++) {
  62                 if (!strcmp(edev->id.sig, eisa_table[i].id.sig)) {
  63                         strscpy(edev->pretty_name,
  64                                 eisa_table[i].name,
  65                                 sizeof(edev->pretty_name));
  66                         return;
  67                 }
  68         }
  69
  70         /* No name was found */
  71         sprintf(edev->pretty_name, "EISA device %.7s", edev->id.sig);
  72 #endif
  73 }
  74
  75 static char __init *decode_eisa_sig(unsigned long addr)
  76 {
  77         static char sig_str[EISA_SIG_LEN];
  78         u8 sig[4];
  79         u16 rev;
  80         int i;
  81
  82         for (i = 0; i < 4; i++) {
  83 #ifdef CONFIG_EISA_VLB_PRIMING
  84                 /*
  85                  * This ugly stuff is used to wake up VL-bus cards
  86                  * (AHA-284x is the only known example), so we can
  87                  * read the EISA id.
  88                  *
  89                  * Thankfully, this only exists on x86...
  90                  */
  91                 outb(0x80 + i, addr);
  92 #endif
  93                 sig[i] = inb(addr + i);
  94
  95                 if (!i && (sig[0] & 0x80))
  96                         return NULL;
  97         }
  98
  99         sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
 100         sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
 101         sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
 102         rev = (sig[2] << 8) | sig[3];
 103         sprintf(sig_str + 3, "%04X", rev);
 104
 105         return sig_str;
 106 }
 107
 108 static int eisa_bus_match(struct device *dev, const struct device_driver *drv)
 109 {
 110         struct eisa_device *edev = to_eisa_device(dev);
 111         const struct eisa_driver *edrv = to_eisa_driver(drv);
 112         const struct eisa_device_id *eids = edrv->id_table;
 113
 114         if (!eids)
 115                 return 0;
 116
 117         while (strlen(eids->sig)) {
 118                 if (!strcmp(eids->sig, edev->id.sig) &&
 119                     edev->state & EISA_CONFIG_ENABLED) {
 120                         edev->id.driver_data = eids->driver_data;
 121                         return 1;
 122                 }
 123
 124                 eids++;
 125         }
 126
 127         return 0;
 128 }
 129
 130 static int eisa_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 131 {
 132         const struct eisa_device *edev = to_eisa_device(dev);
 133
 134         add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
 135         return 0;
 136 }
 137
 138 struct bus_type eisa_bus_type = {
 139         .name  = "eisa",
 140         .match = eisa_bus_match,
 141         .uevent = eisa_bus_uevent,
 142 };
 143 EXPORT_SYMBOL(eisa_bus_type);
 144
 145 int eisa_driver_register(struct eisa_driver *edrv)
 146 {
 147         edrv->driver.bus = &eisa_bus_type;
 148         return driver_register(&edrv->driver);
 149 }
 150 EXPORT_SYMBOL(eisa_driver_register);
 151
 152 void eisa_driver_unregister(struct eisa_driver *edrv)
 153 {
 154         driver_unregister(&edrv->driver);
 155 }
 156 EXPORT_SYMBOL(eisa_driver_unregister);
 157
 158 static ssize_t signature_show(struct device *dev,
 159                               struct device_attribute *attr, char *buf)
 160 {
 161         struct eisa_device *edev = to_eisa_device(dev);
 162         return sprintf(buf, "%s\n", edev->id.sig);
 163 }
 164 static DEVICE_ATTR_RO(signature);
 165
 166 static ssize_t enabled_show(struct device *dev,
 167                             struct device_attribute *attr, char *buf)
 168 {
 169         struct eisa_device *edev = to_eisa_device(dev);
 170         return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED);
 171 }
 172 static DEVICE_ATTR_RO(enabled);
 173
 174 static ssize_t modalias_show(struct device *dev,
 175                              struct device_attribute *attr, char *buf)
 176 {
 177         struct eisa_device *edev = to_eisa_device(dev);
 178         return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
 179 }
 180 static DEVICE_ATTR_RO(modalias);
 181
 182 static int __init eisa_init_device(struct eisa_root_device *root,
 183                                    struct eisa_device *edev,
 184                                    int slot)
 185 {
 186         char *sig;
 187         unsigned long sig_addr;
 188         int i;
 189
 190         sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET;
 191
 192         sig = decode_eisa_sig(sig_addr);
 193         if (!sig)
 194                 return -1;      /* No EISA device here */
 195
 196         memcpy(edev->id.sig, sig, EISA_SIG_LEN);
 197         edev->slot = slot;
 198         edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET)
 199                       & EISA_CONFIG_ENABLED;
 200         edev->base_addr = SLOT_ADDRESS(root, slot);
 201         edev->dma_mask = root->dma_mask; /* Default DMA mask */
 202         eisa_name_device(edev);
 203         edev->dev.parent = root->dev;
 204         edev->dev.bus = &eisa_bus_type;
 205         edev->dev.dma_mask = &edev->dma_mask;
 206         edev->dev.coherent_dma_mask = edev->dma_mask;
 207         dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);
 208
 209         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 210 #ifdef CONFIG_EISA_NAMES
 211                 edev->res[i].name = edev->pretty_name;
 212 #else
 213                 edev->res[i].name = edev->id.sig;
 214 #endif
 215         }
 216
 217         if (is_forced_dev(enable_dev, enable_dev_count, root, edev))
 218                 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
 219
 220         if (is_forced_dev(disable_dev, disable_dev_count, root, edev))
 221                 edev->state = EISA_CONFIG_FORCED;
 222
 223         return 0;
 224 }
 225
 226 static int __init eisa_register_device(struct eisa_device *edev)
 227 {
 228         int rc = device_register(&edev->dev);
 229         if (rc) {
 230                 put_device(&edev->dev);
 231                 return rc;
 232         }
 233
 234         rc = device_create_file(&edev->dev, &dev_attr_signature);
 235         if (rc)
 236                 goto err_devreg;
 237         rc = device_create_file(&edev->dev, &dev_attr_enabled);
 238         if (rc)
 239                 goto err_sig;
 240         rc = device_create_file(&edev->dev, &dev_attr_modalias);
 241         if (rc)
 242                 goto err_enab;
 243
 244         return 0;
 245
 246 err_enab:
 247         device_remove_file(&edev->dev, &dev_attr_enabled);
 248 err_sig:
 249         device_remove_file(&edev->dev, &dev_attr_signature);
 250 err_devreg:
 251         device_unregister(&edev->dev);
 252         return rc;
 253 }
 254
 255 static int __init eisa_request_resources(struct eisa_root_device *root,
 256                                          struct eisa_device *edev,
 257                                          int slot)
 258 {
 259         int i;
 260
 261         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 262                 /* Don't register resource for slot 0, since this is
 263                  * very likely to fail... :-( Instead, grab the EISA
 264                  * id, now we can display something in /proc/ioports.
 265                  */
 266
 267                 /* Only one region for mainboard */
 268                 if (!slot && i > 0) {
 269                         edev->res[i].start = edev->res[i].end = 0;
 270                         continue;
 271                 }
 272
 273                 if (slot) {
 274                         edev->res[i].name  = NULL;
 275                         edev->res[i].start = SLOT_ADDRESS(root, slot)
 276                                              + (i * 0x400);
 277                         edev->res[i].end   = edev->res[i].start + 0xff;
 278                         edev->res[i].flags = IORESOURCE_IO;
 279                 } else {
 280                         edev->res[i].name  = NULL;
 281                         edev->res[i].start = SLOT_ADDRESS(root, slot)
 282                                              + EISA_VENDOR_ID_OFFSET;
 283                         edev->res[i].end   = edev->res[i].start + 3;
 284                         edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY;
 285                 }
 286
 287                 if (request_resource(root->res, &edev->res[i]))
 288                         goto failed;
 289         }
 290
 291         return 0;
 292
 293  failed:
 294         while (--i >= 0)
 295                 release_resource(&edev->res[i]);
 296
 297         return -1;
 298 }
 299
 300 static void __init eisa_release_resources(struct eisa_device *edev)
 301 {
 302         int i;
 303
 304         for (i = 0; i < EISA_MAX_RESOURCES; i++)
 305                 if (edev->res[i].start || edev->res[i].end)
 306                         release_resource(&edev->res[i]);
 307 }
 308
 309 static int __init eisa_probe(struct eisa_root_device *root)
 310 {
 311         int i, c;
 312         struct eisa_device *edev;
 313         char *enabled_str;
 314
 315         dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr);
 316
 317         /* First try to get hold of slot 0. If there is no device
 318          * here, simply fail, unless root->force_probe is set. */
 319
 320         edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 321         if (!edev)
 322                 return -ENOMEM;
 323
 324         if (eisa_request_resources(root, edev, 0)) {
 325                 dev_warn(root->dev,
 326                          "EISA: Cannot allocate resource for mainboard\n");
 327                 kfree(edev);
 328                 if (!root->force_probe)
 329                         return -EBUSY;
 330                 goto force_probe;
 331         }
 332
 333         if (eisa_init_device(root, edev, 0)) {
 334                 eisa_release_resources(edev);
 335                 kfree(edev);
 336                 if (!root->force_probe)
 337                         return -ENODEV;
 338                 goto force_probe;
 339         }
 340
 341         dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig);
 342
 343         if (eisa_register_device(edev)) {
 344                 dev_err(&edev->dev, "EISA: Failed to register %s\n",
 345                         edev->id.sig);
 346                 eisa_release_resources(edev);
 347                 kfree(edev);
 348         }
 349
 350  force_probe:
 351
 352         for (c = 0, i = 1; i <= root->slots; i++) {
 353                 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 354                 if (!edev) {
 355                         dev_err(root->dev, "EISA: Out of memory for slot %d\n",
 356                                 i);
 357                         continue;
 358                 }
 359
 360                 if (eisa_request_resources(root, edev, i)) {
 361                         dev_warn(root->dev,
 362                                  "Cannot allocate resource for EISA slot %d\n",
 363                                  i);
 364                         kfree(edev);
 365                         continue;
 366                 }
 367
 368                 if (eisa_init_device(root, edev, i)) {
 369                         eisa_release_resources(edev);
 370                         kfree(edev);
 371                         continue;
 372                 }
 373
 374                 if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED))
 375                         enabled_str = " (forced enabled)";
 376                 else if (edev->state == EISA_CONFIG_FORCED)
 377                         enabled_str = " (forced disabled)";
 378                 else if (edev->state == 0)
 379                         enabled_str = " (disabled)";
 380                 else
 381                         enabled_str = "";
 382
 383                 dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i,
 384                          edev->id.sig, enabled_str);
 385
 386                 c++;
 387
 388                 if (eisa_register_device(edev)) {
 389                         dev_err(&edev->dev, "EISA: Failed to register %s\n",
 390                                 edev->id.sig);
 391                         eisa_release_resources(edev);
 392                         kfree(edev);
 393                 }
 394         }
 395
 396         dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s");
 397         return 0;
 398 }
 399
 400 static struct resource eisa_root_res = {
 401         .name  = "EISA root resource",
 402         .start = 0,
 403         .end   = 0xffffffff,
 404         .flags = IORESOURCE_IO,
 405 };
 406
 407 static int eisa_bus_count;
 408
 409 int __init eisa_root_register(struct eisa_root_device *root)
 410 {
 411         int err;
 412
 413         /* Use our own resources to check if this bus base address has
 414          * been already registered. This prevents the virtual root
 415          * device from registering after the real one has, for
 416          * example... */
 417
 418         root->eisa_root_res.name  = eisa_root_res.name;
 419         root->eisa_root_res.start = root->res->start;
 420         root->eisa_root_res.end   = root->res->end;
 421         root->eisa_root_res.flags = IORESOURCE_BUSY;
 422
 423         err = request_resource(&eisa_root_res, &root->eisa_root_res);
 424         if (err)
 425                 return err;
 426
 427         root->bus_nr = eisa_bus_count++;
 428
 429         err = eisa_probe(root);
 430         if (err)
 431                 release_resource(&root->eisa_root_res);
 432
 433         return err;
 434 }
 435
 436 static int __init eisa_init(void)
 437 {
 438         int r;
 439
 440         r = bus_register(&eisa_bus_type);
 441         if (r)
 442                 return r;
 443
 444         printk(KERN_INFO "EISA bus registered\n");
 445         return 0;
 446 }
 447
 448 module_param_array(enable_dev, int, &enable_dev_count, 0444);
 449 module_param_array(disable_dev, int, &disable_dev_count, 0444);
 450
 451 postcore_initcall(eisa_init);
 452
 453 int EISA_bus;           /* for legacy drivers */
 454 EXPORT_SYMBOL(EISA_bus);