1 /* 2 * Industry-pack bus support functions. 3 * 4 * Copyright (C) 2011-2012 CERN (www.cern.ch) 5 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; version 2 of the License. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/idr.h> 15 #include <linux/io.h> 16 #include <linux/ipack.h> 17 18 #define to_ipack_dev(device) container_of(device, struct ipack_device, dev) 19 #define to_ipack_driver(drv) container_of(drv, struct ipack_driver, driver) 20 21 static DEFINE_IDA(ipack_ida); 22 23 static void ipack_device_release(struct device *dev) 24 { 25 struct ipack_device *device = to_ipack_dev(dev); 26 kfree(device->id); 27 device->release(device); 28 } 29 30 static inline const struct ipack_device_id * 31 ipack_match_one_device(const struct ipack_device_id *id, 32 const struct ipack_device *device) 33 { 34 if ((id->format == IPACK_ANY_FORMAT || 35 id->format == device->id_format) && 36 (id->vendor == IPACK_ANY_ID || id->vendor == device->id_vendor) && 37 (id->device == IPACK_ANY_ID || id->device == device->id_device)) 38 return id; 39 return NULL; 40 } 41 42 static const struct ipack_device_id * 43 ipack_match_id(const struct ipack_device_id *ids, struct ipack_device *idev) 44 { 45 if (ids) { 46 while (ids->vendor || ids->device) { 47 if (ipack_match_one_device(ids, idev)) 48 return ids; 49 ids++; 50 } 51 } 52 return NULL; 53 } 54 55 static int ipack_bus_match(struct device *dev, struct device_driver *drv) 56 { 57 struct ipack_device *idev = to_ipack_dev(dev); 58 struct ipack_driver *idrv = to_ipack_driver(drv); 59 const struct ipack_device_id *found_id; 60 61 found_id = ipack_match_id(idrv->id_table, idev); 62 return found_id ? 1 : 0; 63 } 64 65 static int ipack_bus_probe(struct device *device) 66 { 67 struct ipack_device *dev = to_ipack_dev(device); 68 struct ipack_driver *drv = to_ipack_driver(device->driver); 69 70 if (!drv->ops->probe) 71 return -EINVAL; 72 73 return drv->ops->probe(dev); 74 } 75 76 static int ipack_bus_remove(struct device *device) 77 { 78 struct ipack_device *dev = to_ipack_dev(device); 79 struct ipack_driver *drv = to_ipack_driver(device->driver); 80 81 if (!drv->ops->remove) 82 return -EINVAL; 83 84 drv->ops->remove(dev); 85 return 0; 86 } 87 88 static int ipack_uevent(struct device *dev, struct kobj_uevent_env *env) 89 { 90 struct ipack_device *idev; 91 92 if (!dev) 93 return -ENODEV; 94 95 idev = to_ipack_dev(dev); 96 97 if (add_uevent_var(env, 98 "MODALIAS=ipack:f%02Xv%08Xd%08X", idev->id_format, 99 idev->id_vendor, idev->id_device)) 100 return -ENOMEM; 101 102 return 0; 103 } 104 105 #define ipack_device_attr(field, format_string) \ 106 static ssize_t \ 107 field##_show(struct device *dev, struct device_attribute *attr, \ 108 char *buf) \ 109 { \ 110 struct ipack_device *idev = to_ipack_dev(dev); \ 111 return sprintf(buf, format_string, idev->field); \ 112 } 113 114 static ssize_t id_show(struct device *dev, 115 struct device_attribute *attr, char *buf) 116 { 117 unsigned int i, c, l, s; 118 struct ipack_device *idev = to_ipack_dev(dev); 119 120 121 switch (idev->id_format) { 122 case IPACK_ID_VERSION_1: 123 l = 0x7; s = 1; break; 124 case IPACK_ID_VERSION_2: 125 l = 0xf; s = 2; break; 126 default: 127 return -EIO; 128 } 129 c = 0; 130 for (i = 0; i < idev->id_avail; i++) { 131 if (i > 0) { 132 if ((i & l) == 0) 133 buf[c++] = '\n'; 134 else if ((i & s) == 0) 135 buf[c++] = ' '; 136 } 137 sprintf(&buf[c], "%02x", idev->id[i]); 138 c += 2; 139 } 140 buf[c++] = '\n'; 141 return c; 142 } 143 144 static ssize_t 145 id_vendor_show(struct device *dev, struct device_attribute *attr, char *buf) 146 { 147 struct ipack_device *idev = to_ipack_dev(dev); 148 switch (idev->id_format) { 149 case IPACK_ID_VERSION_1: 150 return sprintf(buf, "0x%02x\n", idev->id_vendor); 151 case IPACK_ID_VERSION_2: 152 return sprintf(buf, "0x%06x\n", idev->id_vendor); 153 default: 154 return -EIO; 155 } 156 } 157 158 static ssize_t 159 id_device_show(struct device *dev, struct device_attribute *attr, char *buf) 160 { 161 struct ipack_device *idev = to_ipack_dev(dev); 162 switch (idev->id_format) { 163 case IPACK_ID_VERSION_1: 164 return sprintf(buf, "0x%02x\n", idev->id_device); 165 case IPACK_ID_VERSION_2: 166 return sprintf(buf, "0x%04x\n", idev->id_device); 167 default: 168 return -EIO; 169 } 170 } 171 172 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 173 char *buf) 174 { 175 struct ipack_device *idev = to_ipack_dev(dev); 176 177 return sprintf(buf, "ipac:f%02Xv%08Xd%08X", idev->id_format, 178 idev->id_vendor, idev->id_device); 179 } 180 181 ipack_device_attr(id_format, "0x%hhu\n"); 182 183 static DEVICE_ATTR_RO(id); 184 static DEVICE_ATTR_RO(id_device); 185 static DEVICE_ATTR_RO(id_format); 186 static DEVICE_ATTR_RO(id_vendor); 187 static DEVICE_ATTR_RO(modalias); 188 189 static struct attribute *ipack_attrs[] = { 190 &dev_attr_id.attr, 191 &dev_attr_id_device.attr, 192 &dev_attr_id_format.attr, 193 &dev_attr_id_vendor.attr, 194 &dev_attr_modalias.attr, 195 NULL, 196 }; 197 ATTRIBUTE_GROUPS(ipack); 198 199 static struct bus_type ipack_bus_type = { 200 .name = "ipack", 201 .probe = ipack_bus_probe, 202 .match = ipack_bus_match, 203 .remove = ipack_bus_remove, 204 .dev_groups = ipack_groups, 205 .uevent = ipack_uevent, 206 }; 207 208 struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots, 209 const struct ipack_bus_ops *ops, 210 struct module *owner) 211 { 212 int bus_nr; 213 struct ipack_bus_device *bus; 214 215 bus = kzalloc(sizeof(struct ipack_bus_device), GFP_KERNEL); 216 if (!bus) 217 return NULL; 218 219 bus_nr = ida_simple_get(&ipack_ida, 0, 0, GFP_KERNEL); 220 if (bus_nr < 0) { 221 kfree(bus); 222 return NULL; 223 } 224 225 bus->bus_nr = bus_nr; 226 bus->parent = parent; 227 bus->slots = slots; 228 bus->ops = ops; 229 bus->owner = owner; 230 return bus; 231 } 232 EXPORT_SYMBOL_GPL(ipack_bus_register); 233 234 static int ipack_unregister_bus_member(struct device *dev, void *data) 235 { 236 struct ipack_device *idev = to_ipack_dev(dev); 237 struct ipack_bus_device *bus = data; 238 239 if (idev->bus == bus) 240 ipack_device_del(idev); 241 242 return 1; 243 } 244 245 int ipack_bus_unregister(struct ipack_bus_device *bus) 246 { 247 bus_for_each_dev(&ipack_bus_type, NULL, bus, 248 ipack_unregister_bus_member); 249 ida_simple_remove(&ipack_ida, bus->bus_nr); 250 kfree(bus); 251 return 0; 252 } 253 EXPORT_SYMBOL_GPL(ipack_bus_unregister); 254 255 int ipack_driver_register(struct ipack_driver *edrv, struct module *owner, 256 const char *name) 257 { 258 edrv->driver.owner = owner; 259 edrv->driver.name = name; 260 edrv->driver.bus = &ipack_bus_type; 261 return driver_register(&edrv->driver); 262 } 263 EXPORT_SYMBOL_GPL(ipack_driver_register); 264 265 void ipack_driver_unregister(struct ipack_driver *edrv) 266 { 267 driver_unregister(&edrv->driver); 268 } 269 EXPORT_SYMBOL_GPL(ipack_driver_unregister); 270 271 static u16 ipack_crc_byte(u16 crc, u8 c) 272 { 273 int i; 274 275 crc ^= c << 8; 276 for (i = 0; i < 8; i++) 277 crc = (crc << 1) ^ ((crc & 0x8000) ? 0x1021 : 0); 278 return crc; 279 } 280 281 /* 282 * The algorithm in lib/crc-ccitt.c does not seem to apply since it uses the 283 * opposite bit ordering. 284 */ 285 static u8 ipack_calc_crc1(struct ipack_device *dev) 286 { 287 u8 c; 288 u16 crc; 289 unsigned int i; 290 291 crc = 0xffff; 292 for (i = 0; i < dev->id_avail; i++) { 293 c = (i != 11) ? dev->id[i] : 0; 294 crc = ipack_crc_byte(crc, c); 295 } 296 crc = ~crc; 297 return crc & 0xff; 298 } 299 300 static u16 ipack_calc_crc2(struct ipack_device *dev) 301 { 302 u8 c; 303 u16 crc; 304 unsigned int i; 305 306 crc = 0xffff; 307 for (i = 0; i < dev->id_avail; i++) { 308 c = ((i != 0x18) && (i != 0x19)) ? dev->id[i] : 0; 309 crc = ipack_crc_byte(crc, c); 310 } 311 crc = ~crc; 312 return crc; 313 } 314 315 static void ipack_parse_id1(struct ipack_device *dev) 316 { 317 u8 *id = dev->id; 318 u8 crc; 319 320 dev->id_vendor = id[4]; 321 dev->id_device = id[5]; 322 dev->speed_8mhz = 1; 323 dev->speed_32mhz = (id[7] == 'H'); 324 crc = ipack_calc_crc1(dev); 325 dev->id_crc_correct = (crc == id[11]); 326 if (!dev->id_crc_correct) { 327 dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n", 328 id[11], crc); 329 } 330 } 331 332 static void ipack_parse_id2(struct ipack_device *dev) 333 { 334 __be16 *id = (__be16 *) dev->id; 335 u16 flags, crc; 336 337 dev->id_vendor = ((be16_to_cpu(id[3]) & 0xff) << 16) 338 + be16_to_cpu(id[4]); 339 dev->id_device = be16_to_cpu(id[5]); 340 flags = be16_to_cpu(id[10]); 341 dev->speed_8mhz = !!(flags & 2); 342 dev->speed_32mhz = !!(flags & 4); 343 crc = ipack_calc_crc2(dev); 344 dev->id_crc_correct = (crc == be16_to_cpu(id[12])); 345 if (!dev->id_crc_correct) { 346 dev_warn(&dev->dev, "ID CRC invalid found 0x%x, expected 0x%x.\n", 347 id[11], crc); 348 } 349 } 350 351 static int ipack_device_read_id(struct ipack_device *dev) 352 { 353 u8 __iomem *idmem; 354 int i; 355 int ret = 0; 356 357 idmem = ioremap(dev->region[IPACK_ID_SPACE].start, 358 dev->region[IPACK_ID_SPACE].size); 359 if (!idmem) { 360 dev_err(&dev->dev, "error mapping memory\n"); 361 return -ENOMEM; 362 } 363 364 /* Determine ID PROM Data Format. If we find the ids "IPAC" or "IPAH" 365 * we are dealing with a IndustryPack format 1 device. If we detect 366 * "VITA4 " (16 bit big endian formatted) we are dealing with a 367 * IndustryPack format 2 device */ 368 if ((ioread8(idmem + 1) == 'I') && 369 (ioread8(idmem + 3) == 'P') && 370 (ioread8(idmem + 5) == 'A') && 371 ((ioread8(idmem + 7) == 'C') || 372 (ioread8(idmem + 7) == 'H'))) { 373 dev->id_format = IPACK_ID_VERSION_1; 374 dev->id_avail = ioread8(idmem + 0x15); 375 if ((dev->id_avail < 0x0c) || (dev->id_avail > 0x40)) { 376 dev_warn(&dev->dev, "invalid id size"); 377 dev->id_avail = 0x0c; 378 } 379 } else if ((ioread8(idmem + 0) == 'I') && 380 (ioread8(idmem + 1) == 'V') && 381 (ioread8(idmem + 2) == 'A') && 382 (ioread8(idmem + 3) == 'T') && 383 (ioread8(idmem + 4) == ' ') && 384 (ioread8(idmem + 5) == '4')) { 385 dev->id_format = IPACK_ID_VERSION_2; 386 dev->id_avail = ioread16be(idmem + 0x16); 387 if ((dev->id_avail < 0x1a) || (dev->id_avail > 0x40)) { 388 dev_warn(&dev->dev, "invalid id size"); 389 dev->id_avail = 0x1a; 390 } 391 } else { 392 dev->id_format = IPACK_ID_VERSION_INVALID; 393 dev->id_avail = 0; 394 } 395 396 if (!dev->id_avail) { 397 ret = -ENODEV; 398 goto out; 399 } 400 401 /* Obtain the amount of memory required to store a copy of the complete 402 * ID ROM contents */ 403 dev->id = kmalloc(dev->id_avail, GFP_KERNEL); 404 if (!dev->id) { 405 dev_err(&dev->dev, "dev->id alloc failed.\n"); 406 ret = -ENOMEM; 407 goto out; 408 } 409 for (i = 0; i < dev->id_avail; i++) { 410 if (dev->id_format == IPACK_ID_VERSION_1) 411 dev->id[i] = ioread8(idmem + (i << 1) + 1); 412 else 413 dev->id[i] = ioread8(idmem + i); 414 } 415 416 /* now we can finally work with the copy */ 417 switch (dev->id_format) { 418 case IPACK_ID_VERSION_1: 419 ipack_parse_id1(dev); 420 break; 421 case IPACK_ID_VERSION_2: 422 ipack_parse_id2(dev); 423 break; 424 } 425 426 out: 427 iounmap(idmem); 428 429 return ret; 430 } 431 432 int ipack_device_init(struct ipack_device *dev) 433 { 434 int ret; 435 436 dev->dev.bus = &ipack_bus_type; 437 dev->dev.release = ipack_device_release; 438 dev->dev.parent = dev->bus->parent; 439 dev_set_name(&dev->dev, 440 "ipack-dev.%u.%u", dev->bus->bus_nr, dev->slot); 441 device_initialize(&dev->dev); 442 443 if (dev->bus->ops->set_clockrate(dev, 8)) 444 dev_warn(&dev->dev, "failed to switch to 8 MHz operation for reading of device ID.\n"); 445 if (dev->bus->ops->reset_timeout(dev)) 446 dev_warn(&dev->dev, "failed to reset potential timeout."); 447 448 ret = ipack_device_read_id(dev); 449 if (ret < 0) { 450 dev_err(&dev->dev, "error reading device id section.\n"); 451 return ret; 452 } 453 454 /* if the device supports 32 MHz operation, use it. */ 455 if (dev->speed_32mhz) { 456 ret = dev->bus->ops->set_clockrate(dev, 32); 457 if (ret < 0) 458 dev_err(&dev->dev, "failed to switch to 32 MHz operation.\n"); 459 } 460 461 return 0; 462 } 463 EXPORT_SYMBOL_GPL(ipack_device_init); 464 465 int ipack_device_add(struct ipack_device *dev) 466 { 467 return device_add(&dev->dev); 468 } 469 EXPORT_SYMBOL_GPL(ipack_device_add); 470 471 void ipack_device_del(struct ipack_device *dev) 472 { 473 device_del(&dev->dev); 474 ipack_put_device(dev); 475 } 476 EXPORT_SYMBOL_GPL(ipack_device_del); 477 478 void ipack_get_device(struct ipack_device *dev) 479 { 480 get_device(&dev->dev); 481 } 482 EXPORT_SYMBOL_GPL(ipack_get_device); 483 484 void ipack_put_device(struct ipack_device *dev) 485 { 486 put_device(&dev->dev); 487 } 488 EXPORT_SYMBOL_GPL(ipack_put_device); 489 490 static int __init ipack_init(void) 491 { 492 ida_init(&ipack_ida); 493 return bus_register(&ipack_bus_type); 494 } 495 496 static void __exit ipack_exit(void) 497 { 498 bus_unregister(&ipack_bus_type); 499 ida_destroy(&ipack_ida); 500 } 501 502 module_init(ipack_init); 503 module_exit(ipack_exit); 504 505 MODULE_AUTHOR("Samuel Iglesias Gonsalvez <siglesias@igalia.com>"); 506 MODULE_LICENSE("GPL"); 507 MODULE_DESCRIPTION("Industry-pack bus core"); 508