1 // SPDX-License-Identifier: GPL-2.0+ 2 /* MDIO Bus interface 3 * 4 * Author: Andy Fleming 5 * 6 * Copyright (c) 2004 Freescale Semiconductor, Inc. 7 */ 8 9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11 #include <linux/delay.h> 12 #include <linux/device.h> 13 #include <linux/errno.h> 14 #include <linux/etherdevice.h> 15 #include <linux/ethtool.h> 16 #include <linux/gpio/consumer.h> 17 #include <linux/init.h> 18 #include <linux/interrupt.h> 19 #include <linux/io.h> 20 #include <linux/kernel.h> 21 #include <linux/micrel_phy.h> 22 #include <linux/mii.h> 23 #include <linux/mm.h> 24 #include <linux/module.h> 25 #include <linux/netdevice.h> 26 #include <linux/of_device.h> 27 #include <linux/of_mdio.h> 28 #include <linux/phy.h> 29 #include <linux/reset.h> 30 #include <linux/skbuff.h> 31 #include <linux/slab.h> 32 #include <linux/spinlock.h> 33 #include <linux/string.h> 34 #include <linux/uaccess.h> 35 #include <linux/unistd.h> 36 37 #define CREATE_TRACE_POINTS 38 #include <trace/events/mdio.h> 39 40 #include "mdio-boardinfo.h" 41 42 static int mdiobus_register_gpiod(struct mdio_device *mdiodev) 43 { 44 /* Deassert the optional reset signal */ 45 mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev, 46 "reset", GPIOD_OUT_LOW); 47 if (IS_ERR(mdiodev->reset_gpio)) 48 return PTR_ERR(mdiodev->reset_gpio); 49 50 if (mdiodev->reset_gpio) 51 gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset"); 52 53 return 0; 54 } 55 56 static int mdiobus_register_reset(struct mdio_device *mdiodev) 57 { 58 struct reset_control *reset; 59 60 reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy"); 61 if (IS_ERR(reset)) 62 return PTR_ERR(reset); 63 64 mdiodev->reset_ctrl = reset; 65 66 return 0; 67 } 68 69 int mdiobus_register_device(struct mdio_device *mdiodev) 70 { 71 int err; 72 73 if (mdiodev->bus->mdio_map[mdiodev->addr]) 74 return -EBUSY; 75 76 if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) { 77 err = mdiobus_register_gpiod(mdiodev); 78 if (err) 79 return err; 80 81 err = mdiobus_register_reset(mdiodev); 82 if (err) 83 return err; 84 85 /* Assert the reset signal */ 86 mdio_device_reset(mdiodev, 1); 87 } 88 89 mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev; 90 91 return 0; 92 } 93 EXPORT_SYMBOL(mdiobus_register_device); 94 95 int mdiobus_unregister_device(struct mdio_device *mdiodev) 96 { 97 if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev) 98 return -EINVAL; 99 100 reset_control_put(mdiodev->reset_ctrl); 101 102 mdiodev->bus->mdio_map[mdiodev->addr] = NULL; 103 104 return 0; 105 } 106 EXPORT_SYMBOL(mdiobus_unregister_device); 107 108 static struct mdio_device *mdiobus_find_device(struct mii_bus *bus, int addr) 109 { 110 bool addr_valid = addr >= 0 && addr < ARRAY_SIZE(bus->mdio_map); 111 112 if (WARN_ONCE(!addr_valid, "addr %d out of range\n", addr)) 113 return NULL; 114 115 return bus->mdio_map[addr]; 116 } 117 118 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr) 119 { 120 struct mdio_device *mdiodev; 121 122 mdiodev = mdiobus_find_device(bus, addr); 123 if (!mdiodev) 124 return NULL; 125 126 if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY)) 127 return NULL; 128 129 return container_of(mdiodev, struct phy_device, mdio); 130 } 131 EXPORT_SYMBOL(mdiobus_get_phy); 132 133 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr) 134 { 135 return mdiobus_find_device(bus, addr) != NULL; 136 } 137 EXPORT_SYMBOL(mdiobus_is_registered_device); 138 139 /** 140 * mdiobus_alloc_size - allocate a mii_bus structure 141 * @size: extra amount of memory to allocate for private storage. 142 * If non-zero, then bus->priv is points to that memory. 143 * 144 * Description: called by a bus driver to allocate an mii_bus 145 * structure to fill in. 146 */ 147 struct mii_bus *mdiobus_alloc_size(size_t size) 148 { 149 struct mii_bus *bus; 150 size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN); 151 size_t alloc_size; 152 int i; 153 154 /* If we alloc extra space, it should be aligned */ 155 if (size) 156 alloc_size = aligned_size + size; 157 else 158 alloc_size = sizeof(*bus); 159 160 bus = kzalloc(alloc_size, GFP_KERNEL); 161 if (!bus) 162 return NULL; 163 164 bus->state = MDIOBUS_ALLOCATED; 165 if (size) 166 bus->priv = (void *)bus + aligned_size; 167 168 /* Initialise the interrupts to polling and 64-bit seqcounts */ 169 for (i = 0; i < PHY_MAX_ADDR; i++) { 170 bus->irq[i] = PHY_POLL; 171 u64_stats_init(&bus->stats[i].syncp); 172 } 173 174 return bus; 175 } 176 EXPORT_SYMBOL(mdiobus_alloc_size); 177 178 /** 179 * mdiobus_release - mii_bus device release callback 180 * @d: the target struct device that contains the mii_bus 181 * 182 * Description: called when the last reference to an mii_bus is 183 * dropped, to free the underlying memory. 184 */ 185 static void mdiobus_release(struct device *d) 186 { 187 struct mii_bus *bus = to_mii_bus(d); 188 189 WARN(bus->state != MDIOBUS_RELEASED && 190 /* for compatibility with error handling in drivers */ 191 bus->state != MDIOBUS_ALLOCATED, 192 "%s: not in RELEASED or ALLOCATED state\n", 193 bus->id); 194 195 if (bus->state == MDIOBUS_RELEASED) 196 fwnode_handle_put(dev_fwnode(d)); 197 198 kfree(bus); 199 } 200 201 struct mdio_bus_stat_attr { 202 int addr; 203 unsigned int field_offset; 204 }; 205 206 static u64 mdio_bus_get_stat(struct mdio_bus_stats *s, unsigned int offset) 207 { 208 const char *p = (const char *)s + offset; 209 unsigned int start; 210 u64 val = 0; 211 212 do { 213 start = u64_stats_fetch_begin(&s->syncp); 214 val = u64_stats_read((const u64_stats_t *)p); 215 } while (u64_stats_fetch_retry(&s->syncp, start)); 216 217 return val; 218 } 219 220 static u64 mdio_bus_get_global_stat(struct mii_bus *bus, unsigned int offset) 221 { 222 unsigned int i; 223 u64 val = 0; 224 225 for (i = 0; i < PHY_MAX_ADDR; i++) 226 val += mdio_bus_get_stat(&bus->stats[i], offset); 227 228 return val; 229 } 230 231 static ssize_t mdio_bus_stat_field_show(struct device *dev, 232 struct device_attribute *attr, 233 char *buf) 234 { 235 struct mii_bus *bus = to_mii_bus(dev); 236 struct mdio_bus_stat_attr *sattr; 237 struct dev_ext_attribute *eattr; 238 u64 val; 239 240 eattr = container_of(attr, struct dev_ext_attribute, attr); 241 sattr = eattr->var; 242 243 if (sattr->addr < 0) 244 val = mdio_bus_get_global_stat(bus, sattr->field_offset); 245 else 246 val = mdio_bus_get_stat(&bus->stats[sattr->addr], 247 sattr->field_offset); 248 249 return sysfs_emit(buf, "%llu\n", val); 250 } 251 252 static ssize_t mdio_bus_device_stat_field_show(struct device *dev, 253 struct device_attribute *attr, 254 char *buf) 255 { 256 struct mdio_device *mdiodev = to_mdio_device(dev); 257 struct mii_bus *bus = mdiodev->bus; 258 struct mdio_bus_stat_attr *sattr; 259 struct dev_ext_attribute *eattr; 260 int addr = mdiodev->addr; 261 u64 val; 262 263 eattr = container_of(attr, struct dev_ext_attribute, attr); 264 sattr = eattr->var; 265 266 val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset); 267 268 return sysfs_emit(buf, "%llu\n", val); 269 } 270 271 #define MDIO_BUS_STATS_ATTR_DECL(field, file) \ 272 static struct dev_ext_attribute dev_attr_mdio_bus_##field = { \ 273 .attr = { .attr = { .name = file, .mode = 0444 }, \ 274 .show = mdio_bus_stat_field_show, \ 275 }, \ 276 .var = &((struct mdio_bus_stat_attr) { \ 277 -1, offsetof(struct mdio_bus_stats, field) \ 278 }), \ 279 }; \ 280 static struct dev_ext_attribute dev_attr_mdio_bus_device_##field = { \ 281 .attr = { .attr = { .name = file, .mode = 0444 }, \ 282 .show = mdio_bus_device_stat_field_show, \ 283 }, \ 284 .var = &((struct mdio_bus_stat_attr) { \ 285 -1, offsetof(struct mdio_bus_stats, field) \ 286 }), \ 287 }; 288 289 #define MDIO_BUS_STATS_ATTR(field) \ 290 MDIO_BUS_STATS_ATTR_DECL(field, __stringify(field)) 291 292 MDIO_BUS_STATS_ATTR(transfers); 293 MDIO_BUS_STATS_ATTR(errors); 294 MDIO_BUS_STATS_ATTR(writes); 295 MDIO_BUS_STATS_ATTR(reads); 296 297 #define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file) \ 298 static struct dev_ext_attribute dev_attr_mdio_bus_addr_##field##_##addr = { \ 299 .attr = { .attr = { .name = file, .mode = 0444 }, \ 300 .show = mdio_bus_stat_field_show, \ 301 }, \ 302 .var = &((struct mdio_bus_stat_attr) { \ 303 addr, offsetof(struct mdio_bus_stats, field) \ 304 }), \ 305 } 306 307 #define MDIO_BUS_STATS_ADDR_ATTR(field, addr) \ 308 MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, \ 309 __stringify(field) "_" __stringify(addr)) 310 311 #define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr) \ 312 MDIO_BUS_STATS_ADDR_ATTR(transfers, addr); \ 313 MDIO_BUS_STATS_ADDR_ATTR(errors, addr); \ 314 MDIO_BUS_STATS_ADDR_ATTR(writes, addr); \ 315 MDIO_BUS_STATS_ADDR_ATTR(reads, addr) \ 316 317 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(0); 318 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(1); 319 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(2); 320 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(3); 321 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(4); 322 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(5); 323 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(6); 324 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(7); 325 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(8); 326 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(9); 327 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(10); 328 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(11); 329 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(12); 330 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(13); 331 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(14); 332 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(15); 333 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(16); 334 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(17); 335 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(18); 336 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(19); 337 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(20); 338 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(21); 339 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(22); 340 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(23); 341 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(24); 342 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(25); 343 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(26); 344 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(27); 345 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(28); 346 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(29); 347 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(30); 348 MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(31); 349 350 #define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr) \ 351 &dev_attr_mdio_bus_addr_transfers_##addr.attr.attr, \ 352 &dev_attr_mdio_bus_addr_errors_##addr.attr.attr, \ 353 &dev_attr_mdio_bus_addr_writes_##addr.attr.attr, \ 354 &dev_attr_mdio_bus_addr_reads_##addr.attr.attr \ 355 356 static struct attribute *mdio_bus_statistics_attrs[] = { 357 &dev_attr_mdio_bus_transfers.attr.attr, 358 &dev_attr_mdio_bus_errors.attr.attr, 359 &dev_attr_mdio_bus_writes.attr.attr, 360 &dev_attr_mdio_bus_reads.attr.attr, 361 MDIO_BUS_STATS_ADDR_ATTR_GROUP(0), 362 MDIO_BUS_STATS_ADDR_ATTR_GROUP(1), 363 MDIO_BUS_STATS_ADDR_ATTR_GROUP(2), 364 MDIO_BUS_STATS_ADDR_ATTR_GROUP(3), 365 MDIO_BUS_STATS_ADDR_ATTR_GROUP(4), 366 MDIO_BUS_STATS_ADDR_ATTR_GROUP(5), 367 MDIO_BUS_STATS_ADDR_ATTR_GROUP(6), 368 MDIO_BUS_STATS_ADDR_ATTR_GROUP(7), 369 MDIO_BUS_STATS_ADDR_ATTR_GROUP(8), 370 MDIO_BUS_STATS_ADDR_ATTR_GROUP(9), 371 MDIO_BUS_STATS_ADDR_ATTR_GROUP(10), 372 MDIO_BUS_STATS_ADDR_ATTR_GROUP(11), 373 MDIO_BUS_STATS_ADDR_ATTR_GROUP(12), 374 MDIO_BUS_STATS_ADDR_ATTR_GROUP(13), 375 MDIO_BUS_STATS_ADDR_ATTR_GROUP(14), 376 MDIO_BUS_STATS_ADDR_ATTR_GROUP(15), 377 MDIO_BUS_STATS_ADDR_ATTR_GROUP(16), 378 MDIO_BUS_STATS_ADDR_ATTR_GROUP(17), 379 MDIO_BUS_STATS_ADDR_ATTR_GROUP(18), 380 MDIO_BUS_STATS_ADDR_ATTR_GROUP(19), 381 MDIO_BUS_STATS_ADDR_ATTR_GROUP(20), 382 MDIO_BUS_STATS_ADDR_ATTR_GROUP(21), 383 MDIO_BUS_STATS_ADDR_ATTR_GROUP(22), 384 MDIO_BUS_STATS_ADDR_ATTR_GROUP(23), 385 MDIO_BUS_STATS_ADDR_ATTR_GROUP(24), 386 MDIO_BUS_STATS_ADDR_ATTR_GROUP(25), 387 MDIO_BUS_STATS_ADDR_ATTR_GROUP(26), 388 MDIO_BUS_STATS_ADDR_ATTR_GROUP(27), 389 MDIO_BUS_STATS_ADDR_ATTR_GROUP(28), 390 MDIO_BUS_STATS_ADDR_ATTR_GROUP(29), 391 MDIO_BUS_STATS_ADDR_ATTR_GROUP(30), 392 MDIO_BUS_STATS_ADDR_ATTR_GROUP(31), 393 NULL, 394 }; 395 396 static const struct attribute_group mdio_bus_statistics_group = { 397 .name = "statistics", 398 .attrs = mdio_bus_statistics_attrs, 399 }; 400 401 static const struct attribute_group *mdio_bus_groups[] = { 402 &mdio_bus_statistics_group, 403 NULL, 404 }; 405 406 static struct class mdio_bus_class = { 407 .name = "mdio_bus", 408 .dev_release = mdiobus_release, 409 .dev_groups = mdio_bus_groups, 410 }; 411 412 /** 413 * mdio_find_bus - Given the name of a mdiobus, find the mii_bus. 414 * @mdio_name: The name of a mdiobus. 415 * 416 * Returns a reference to the mii_bus, or NULL if none found. The 417 * embedded struct device will have its reference count incremented, 418 * and this must be put_deviced'ed once the bus is finished with. 419 */ 420 struct mii_bus *mdio_find_bus(const char *mdio_name) 421 { 422 struct device *d; 423 424 d = class_find_device_by_name(&mdio_bus_class, mdio_name); 425 return d ? to_mii_bus(d) : NULL; 426 } 427 EXPORT_SYMBOL(mdio_find_bus); 428 429 #if IS_ENABLED(CONFIG_OF_MDIO) 430 /** 431 * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. 432 * @mdio_bus_np: Pointer to the mii_bus. 433 * 434 * Returns a reference to the mii_bus, or NULL if none found. The 435 * embedded struct device will have its reference count incremented, 436 * and this must be put once the bus is finished with. 437 * 438 * Because the association of a device_node and mii_bus is made via 439 * of_mdiobus_register(), the mii_bus cannot be found before it is 440 * registered with of_mdiobus_register(). 441 * 442 */ 443 struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np) 444 { 445 struct device *d; 446 447 if (!mdio_bus_np) 448 return NULL; 449 450 d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np); 451 return d ? to_mii_bus(d) : NULL; 452 } 453 EXPORT_SYMBOL(of_mdio_find_bus); 454 455 /* Walk the list of subnodes of a mdio bus and look for a node that 456 * matches the mdio device's address with its 'reg' property. If 457 * found, set the of_node pointer for the mdio device. This allows 458 * auto-probed phy devices to be supplied with information passed in 459 * via DT. 460 * If a PHY package is found, PHY is searched also there. 461 */ 462 static int of_mdiobus_find_phy(struct device *dev, struct mdio_device *mdiodev, 463 struct device_node *np) 464 { 465 struct device_node *child; 466 467 for_each_available_child_of_node(np, child) { 468 int addr; 469 470 if (of_node_name_eq(child, "ethernet-phy-package")) { 471 /* Validate PHY package reg presence */ 472 if (!of_property_present(child, "reg")) { 473 of_node_put(child); 474 return -EINVAL; 475 } 476 477 if (!of_mdiobus_find_phy(dev, mdiodev, child)) { 478 /* The refcount for the PHY package will be 479 * incremented later when PHY join the Package. 480 */ 481 of_node_put(child); 482 return 0; 483 } 484 485 continue; 486 } 487 488 addr = of_mdio_parse_addr(dev, child); 489 if (addr < 0) 490 continue; 491 492 if (addr == mdiodev->addr) { 493 device_set_node(dev, of_fwnode_handle(child)); 494 /* The refcount on "child" is passed to the mdio 495 * device. Do _not_ use of_node_put(child) here. 496 */ 497 return 0; 498 } 499 } 500 501 return -ENODEV; 502 } 503 504 static void of_mdiobus_link_mdiodev(struct mii_bus *bus, 505 struct mdio_device *mdiodev) 506 { 507 struct device *dev = &mdiodev->dev; 508 509 if (dev->of_node || !bus->dev.of_node) 510 return; 511 512 of_mdiobus_find_phy(dev, mdiodev, bus->dev.of_node); 513 } 514 #else /* !IS_ENABLED(CONFIG_OF_MDIO) */ 515 static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio, 516 struct mdio_device *mdiodev) 517 { 518 } 519 #endif 520 521 /** 522 * mdiobus_create_device - create a full MDIO device given 523 * a mdio_board_info structure 524 * @bus: MDIO bus to create the devices on 525 * @bi: mdio_board_info structure describing the devices 526 * 527 * Returns 0 on success or < 0 on error. 528 */ 529 static int mdiobus_create_device(struct mii_bus *bus, 530 struct mdio_board_info *bi) 531 { 532 struct mdio_device *mdiodev; 533 int ret = 0; 534 535 mdiodev = mdio_device_create(bus, bi->mdio_addr); 536 if (IS_ERR(mdiodev)) 537 return -ENODEV; 538 539 strscpy(mdiodev->modalias, bi->modalias, 540 sizeof(mdiodev->modalias)); 541 mdiodev->bus_match = mdio_device_bus_match; 542 mdiodev->dev.platform_data = (void *)bi->platform_data; 543 544 ret = mdio_device_register(mdiodev); 545 if (ret) 546 mdio_device_free(mdiodev); 547 548 return ret; 549 } 550 551 static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45) 552 { 553 struct phy_device *phydev = ERR_PTR(-ENODEV); 554 int err; 555 556 phydev = get_phy_device(bus, addr, c45); 557 if (IS_ERR(phydev)) 558 return phydev; 559 560 /* For DT, see if the auto-probed phy has a corresponding child 561 * in the bus node, and set the of_node pointer in this case. 562 */ 563 of_mdiobus_link_mdiodev(bus, &phydev->mdio); 564 565 err = phy_device_register(phydev); 566 if (err) { 567 phy_device_free(phydev); 568 return ERR_PTR(-ENODEV); 569 } 570 571 return phydev; 572 } 573 574 /** 575 * mdiobus_scan_c22 - scan one address on a bus for C22 MDIO devices. 576 * @bus: mii_bus to scan 577 * @addr: address on bus to scan 578 * 579 * This function scans one address on the MDIO bus, looking for 580 * devices which can be identified using a vendor/product ID in 581 * registers 2 and 3. Not all MDIO devices have such registers, but 582 * PHY devices typically do. Hence this function assumes anything 583 * found is a PHY, or can be treated as a PHY. Other MDIO devices, 584 * such as switches, will probably not be found during the scan. 585 */ 586 struct phy_device *mdiobus_scan_c22(struct mii_bus *bus, int addr) 587 { 588 return mdiobus_scan(bus, addr, false); 589 } 590 EXPORT_SYMBOL(mdiobus_scan_c22); 591 592 /** 593 * mdiobus_scan_c45 - scan one address on a bus for C45 MDIO devices. 594 * @bus: mii_bus to scan 595 * @addr: address on bus to scan 596 * 597 * This function scans one address on the MDIO bus, looking for 598 * devices which can be identified using a vendor/product ID in 599 * registers 2 and 3. Not all MDIO devices have such registers, but 600 * PHY devices typically do. Hence this function assumes anything 601 * found is a PHY, or can be treated as a PHY. Other MDIO devices, 602 * such as switches, will probably not be found during the scan. 603 */ 604 static struct phy_device *mdiobus_scan_c45(struct mii_bus *bus, int addr) 605 { 606 return mdiobus_scan(bus, addr, true); 607 } 608 609 static int mdiobus_scan_bus_c22(struct mii_bus *bus) 610 { 611 int i; 612 613 for (i = 0; i < PHY_MAX_ADDR; i++) { 614 if ((bus->phy_mask & BIT(i)) == 0) { 615 struct phy_device *phydev; 616 617 phydev = mdiobus_scan_c22(bus, i); 618 if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) 619 return PTR_ERR(phydev); 620 } 621 } 622 return 0; 623 } 624 625 static int mdiobus_scan_bus_c45(struct mii_bus *bus) 626 { 627 int i; 628 629 for (i = 0; i < PHY_MAX_ADDR; i++) { 630 if ((bus->phy_mask & BIT(i)) == 0) { 631 struct phy_device *phydev; 632 633 /* Don't scan C45 if we already have a C22 device */ 634 if (bus->mdio_map[i]) 635 continue; 636 637 phydev = mdiobus_scan_c45(bus, i); 638 if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) 639 return PTR_ERR(phydev); 640 } 641 } 642 return 0; 643 } 644 645 /* There are some C22 PHYs which do bad things when where is a C45 646 * transaction on the bus, like accepting a read themselves, and 647 * stomping over the true devices reply, to performing a write to 648 * themselves which was intended for another device. Now that C22 649 * devices have been found, see if any of them are bad for C45, and if we 650 * should skip the C45 scan. 651 */ 652 static bool mdiobus_prevent_c45_scan(struct mii_bus *bus) 653 { 654 int i; 655 656 for (i = 0; i < PHY_MAX_ADDR; i++) { 657 struct phy_device *phydev; 658 u32 oui; 659 660 phydev = mdiobus_get_phy(bus, i); 661 if (!phydev) 662 continue; 663 oui = phydev->phy_id >> 10; 664 665 if (oui == MICREL_OUI) 666 return true; 667 } 668 return false; 669 } 670 671 /** 672 * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus 673 * @bus: target mii_bus 674 * @owner: module containing bus accessor functions 675 * 676 * Description: Called by a bus driver to bring up all the PHYs 677 * on a given bus, and attach them to the bus. Drivers should use 678 * mdiobus_register() rather than __mdiobus_register() unless they 679 * need to pass a specific owner module. MDIO devices which are not 680 * PHYs will not be brought up by this function. They are expected 681 * to be explicitly listed in DT and instantiated by of_mdiobus_register(). 682 * 683 * Returns 0 on success or < 0 on error. 684 */ 685 int __mdiobus_register(struct mii_bus *bus, struct module *owner) 686 { 687 struct mdio_device *mdiodev; 688 struct gpio_desc *gpiod; 689 bool prevent_c45_scan; 690 int i, err; 691 692 if (!bus || !bus->name) 693 return -EINVAL; 694 695 /* An access method always needs both read and write operations */ 696 if (!!bus->read != !!bus->write || !!bus->read_c45 != !!bus->write_c45) 697 return -EINVAL; 698 699 /* At least one method is mandatory */ 700 if (!bus->read && !bus->read_c45) 701 return -EINVAL; 702 703 if (bus->parent && bus->parent->of_node) 704 bus->parent->of_node->fwnode.flags |= 705 FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD; 706 707 WARN(bus->state != MDIOBUS_ALLOCATED && 708 bus->state != MDIOBUS_UNREGISTERED, 709 "%s: not in ALLOCATED or UNREGISTERED state\n", bus->id); 710 711 bus->owner = owner; 712 bus->dev.parent = bus->parent; 713 bus->dev.class = &mdio_bus_class; 714 bus->dev.groups = NULL; 715 dev_set_name(&bus->dev, "%s", bus->id); 716 717 /* If the bus state is allocated, we're registering a fresh bus 718 * that may have a fwnode associated with it. Grab a reference 719 * to the fwnode. This will be dropped when the bus is released. 720 * If the bus was set to unregistered, it means that the bus was 721 * previously registered, and we've already grabbed a reference. 722 */ 723 if (bus->state == MDIOBUS_ALLOCATED) 724 fwnode_handle_get(dev_fwnode(&bus->dev)); 725 726 /* We need to set state to MDIOBUS_UNREGISTERED to correctly release 727 * the device in mdiobus_free() 728 * 729 * State will be updated later in this function in case of success 730 */ 731 bus->state = MDIOBUS_UNREGISTERED; 732 733 err = device_register(&bus->dev); 734 if (err) { 735 pr_err("mii_bus %s failed to register\n", bus->id); 736 return -EINVAL; 737 } 738 739 mutex_init(&bus->mdio_lock); 740 mutex_init(&bus->shared_lock); 741 742 /* assert bus level PHY GPIO reset */ 743 gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_HIGH); 744 if (IS_ERR(gpiod)) { 745 err = dev_err_probe(&bus->dev, PTR_ERR(gpiod), 746 "mii_bus %s couldn't get reset GPIO\n", 747 bus->id); 748 device_del(&bus->dev); 749 return err; 750 } else if (gpiod) { 751 bus->reset_gpiod = gpiod; 752 fsleep(bus->reset_delay_us); 753 gpiod_set_value_cansleep(gpiod, 0); 754 if (bus->reset_post_delay_us > 0) 755 fsleep(bus->reset_post_delay_us); 756 } 757 758 if (bus->reset) { 759 err = bus->reset(bus); 760 if (err) 761 goto error_reset_gpiod; 762 } 763 764 if (bus->read) { 765 err = mdiobus_scan_bus_c22(bus); 766 if (err) 767 goto error; 768 } 769 770 prevent_c45_scan = mdiobus_prevent_c45_scan(bus); 771 772 if (!prevent_c45_scan && bus->read_c45) { 773 err = mdiobus_scan_bus_c45(bus); 774 if (err) 775 goto error; 776 } 777 778 mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device); 779 780 bus->state = MDIOBUS_REGISTERED; 781 dev_dbg(&bus->dev, "probed\n"); 782 return 0; 783 784 error: 785 for (i = 0; i < PHY_MAX_ADDR; i++) { 786 mdiodev = bus->mdio_map[i]; 787 if (!mdiodev) 788 continue; 789 790 mdiodev->device_remove(mdiodev); 791 mdiodev->device_free(mdiodev); 792 } 793 error_reset_gpiod: 794 /* Put PHYs in RESET to save power */ 795 if (bus->reset_gpiod) 796 gpiod_set_value_cansleep(bus->reset_gpiod, 1); 797 798 device_del(&bus->dev); 799 return err; 800 } 801 EXPORT_SYMBOL(__mdiobus_register); 802 803 void mdiobus_unregister(struct mii_bus *bus) 804 { 805 struct mdio_device *mdiodev; 806 int i; 807 808 if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED)) 809 return; 810 bus->state = MDIOBUS_UNREGISTERED; 811 812 for (i = 0; i < PHY_MAX_ADDR; i++) { 813 mdiodev = bus->mdio_map[i]; 814 if (!mdiodev) 815 continue; 816 817 if (mdiodev->reset_gpio) 818 gpiod_put(mdiodev->reset_gpio); 819 820 mdiodev->device_remove(mdiodev); 821 mdiodev->device_free(mdiodev); 822 } 823 824 /* Put PHYs in RESET to save power */ 825 if (bus->reset_gpiod) 826 gpiod_set_value_cansleep(bus->reset_gpiod, 1); 827 828 device_del(&bus->dev); 829 } 830 EXPORT_SYMBOL(mdiobus_unregister); 831 832 /** 833 * mdiobus_free - free a struct mii_bus 834 * @bus: mii_bus to free 835 * 836 * This function releases the reference to the underlying device 837 * object in the mii_bus. If this is the last reference, the mii_bus 838 * will be freed. 839 */ 840 void mdiobus_free(struct mii_bus *bus) 841 { 842 /* For compatibility with error handling in drivers. */ 843 if (bus->state == MDIOBUS_ALLOCATED) { 844 kfree(bus); 845 return; 846 } 847 848 WARN(bus->state != MDIOBUS_UNREGISTERED, 849 "%s: not in UNREGISTERED state\n", bus->id); 850 bus->state = MDIOBUS_RELEASED; 851 852 put_device(&bus->dev); 853 } 854 EXPORT_SYMBOL(mdiobus_free); 855 856 static void mdiobus_stats_acct(struct mdio_bus_stats *stats, bool op, int ret) 857 { 858 preempt_disable(); 859 u64_stats_update_begin(&stats->syncp); 860 861 u64_stats_inc(&stats->transfers); 862 if (ret < 0) { 863 u64_stats_inc(&stats->errors); 864 goto out; 865 } 866 867 if (op) 868 u64_stats_inc(&stats->reads); 869 else 870 u64_stats_inc(&stats->writes); 871 out: 872 u64_stats_update_end(&stats->syncp); 873 preempt_enable(); 874 } 875 876 /** 877 * __mdiobus_read - Unlocked version of the mdiobus_read function 878 * @bus: the mii_bus struct 879 * @addr: the phy address 880 * @regnum: register number to read 881 * 882 * Read a MDIO bus register. Caller must hold the mdio bus lock. 883 * 884 * NOTE: MUST NOT be called from interrupt context. 885 */ 886 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) 887 { 888 int retval; 889 890 lockdep_assert_held_once(&bus->mdio_lock); 891 892 if (bus->read) 893 retval = bus->read(bus, addr, regnum); 894 else 895 retval = -EOPNOTSUPP; 896 897 trace_mdio_access(bus, 1, addr, regnum, retval, retval); 898 mdiobus_stats_acct(&bus->stats[addr], true, retval); 899 900 return retval; 901 } 902 EXPORT_SYMBOL(__mdiobus_read); 903 904 /** 905 * __mdiobus_write - Unlocked version of the mdiobus_write function 906 * @bus: the mii_bus struct 907 * @addr: the phy address 908 * @regnum: register number to write 909 * @val: value to write to @regnum 910 * 911 * Write a MDIO bus register. Caller must hold the mdio bus lock. 912 * 913 * NOTE: MUST NOT be called from interrupt context. 914 */ 915 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) 916 { 917 int err; 918 919 lockdep_assert_held_once(&bus->mdio_lock); 920 921 if (bus->write) 922 err = bus->write(bus, addr, regnum, val); 923 else 924 err = -EOPNOTSUPP; 925 926 trace_mdio_access(bus, 0, addr, regnum, val, err); 927 mdiobus_stats_acct(&bus->stats[addr], false, err); 928 929 return err; 930 } 931 EXPORT_SYMBOL(__mdiobus_write); 932 933 /** 934 * __mdiobus_modify_changed - Unlocked version of the mdiobus_modify function 935 * @bus: the mii_bus struct 936 * @addr: the phy address 937 * @regnum: register number to modify 938 * @mask: bit mask of bits to clear 939 * @set: bit mask of bits to set 940 * 941 * Read, modify, and if any change, write the register value back to the 942 * device. Any error returns a negative number. 943 * 944 * NOTE: MUST NOT be called from interrupt context. 945 */ 946 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum, 947 u16 mask, u16 set) 948 { 949 int new, ret; 950 951 ret = __mdiobus_read(bus, addr, regnum); 952 if (ret < 0) 953 return ret; 954 955 new = (ret & ~mask) | set; 956 if (new == ret) 957 return 0; 958 959 ret = __mdiobus_write(bus, addr, regnum, new); 960 961 return ret < 0 ? ret : 1; 962 } 963 EXPORT_SYMBOL_GPL(__mdiobus_modify_changed); 964 965 /** 966 * __mdiobus_c45_read - Unlocked version of the mdiobus_c45_read function 967 * @bus: the mii_bus struct 968 * @addr: the phy address 969 * @devad: device address to read 970 * @regnum: register number to read 971 * 972 * Read a MDIO bus register. Caller must hold the mdio bus lock. 973 * 974 * NOTE: MUST NOT be called from interrupt context. 975 */ 976 int __mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum) 977 { 978 int retval; 979 980 lockdep_assert_held_once(&bus->mdio_lock); 981 982 if (bus->read_c45) 983 retval = bus->read_c45(bus, addr, devad, regnum); 984 else 985 retval = -EOPNOTSUPP; 986 987 trace_mdio_access(bus, 1, addr, regnum, retval, retval); 988 mdiobus_stats_acct(&bus->stats[addr], true, retval); 989 990 return retval; 991 } 992 EXPORT_SYMBOL(__mdiobus_c45_read); 993 994 /** 995 * __mdiobus_c45_write - Unlocked version of the mdiobus_write function 996 * @bus: the mii_bus struct 997 * @addr: the phy address 998 * @devad: device address to read 999 * @regnum: register number to write 1000 * @val: value to write to @regnum 1001 * 1002 * Write a MDIO bus register. Caller must hold the mdio bus lock. 1003 * 1004 * NOTE: MUST NOT be called from interrupt context. 1005 */ 1006 int __mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum, 1007 u16 val) 1008 { 1009 int err; 1010 1011 lockdep_assert_held_once(&bus->mdio_lock); 1012 1013 if (bus->write_c45) 1014 err = bus->write_c45(bus, addr, devad, regnum, val); 1015 else 1016 err = -EOPNOTSUPP; 1017 1018 trace_mdio_access(bus, 0, addr, regnum, val, err); 1019 mdiobus_stats_acct(&bus->stats[addr], false, err); 1020 1021 return err; 1022 } 1023 EXPORT_SYMBOL(__mdiobus_c45_write); 1024 1025 /** 1026 * __mdiobus_c45_modify_changed - Unlocked version of the mdiobus_modify function 1027 * @bus: the mii_bus struct 1028 * @addr: the phy address 1029 * @devad: device address to read 1030 * @regnum: register number to modify 1031 * @mask: bit mask of bits to clear 1032 * @set: bit mask of bits to set 1033 * 1034 * Read, modify, and if any change, write the register value back to the 1035 * device. Any error returns a negative number. 1036 * 1037 * NOTE: MUST NOT be called from interrupt context. 1038 */ 1039 static int __mdiobus_c45_modify_changed(struct mii_bus *bus, int addr, 1040 int devad, u32 regnum, u16 mask, 1041 u16 set) 1042 { 1043 int new, ret; 1044 1045 ret = __mdiobus_c45_read(bus, addr, devad, regnum); 1046 if (ret < 0) 1047 return ret; 1048 1049 new = (ret & ~mask) | set; 1050 if (new == ret) 1051 return 0; 1052 1053 ret = __mdiobus_c45_write(bus, addr, devad, regnum, new); 1054 1055 return ret < 0 ? ret : 1; 1056 } 1057 1058 /** 1059 * mdiobus_read_nested - Nested version of the mdiobus_read function 1060 * @bus: the mii_bus struct 1061 * @addr: the phy address 1062 * @regnum: register number to read 1063 * 1064 * In case of nested MDIO bus access avoid lockdep false positives by 1065 * using mutex_lock_nested(). 1066 * 1067 * NOTE: MUST NOT be called from interrupt context, 1068 * because the bus read/write functions may wait for an interrupt 1069 * to conclude the operation. 1070 */ 1071 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum) 1072 { 1073 int retval; 1074 1075 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); 1076 retval = __mdiobus_read(bus, addr, regnum); 1077 mutex_unlock(&bus->mdio_lock); 1078 1079 return retval; 1080 } 1081 EXPORT_SYMBOL(mdiobus_read_nested); 1082 1083 /** 1084 * mdiobus_read - Convenience function for reading a given MII mgmt register 1085 * @bus: the mii_bus struct 1086 * @addr: the phy address 1087 * @regnum: register number to read 1088 * 1089 * NOTE: MUST NOT be called from interrupt context, 1090 * because the bus read/write functions may wait for an interrupt 1091 * to conclude the operation. 1092 */ 1093 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) 1094 { 1095 int retval; 1096 1097 mutex_lock(&bus->mdio_lock); 1098 retval = __mdiobus_read(bus, addr, regnum); 1099 mutex_unlock(&bus->mdio_lock); 1100 1101 return retval; 1102 } 1103 EXPORT_SYMBOL(mdiobus_read); 1104 1105 /** 1106 * mdiobus_c45_read - Convenience function for reading a given MII mgmt register 1107 * @bus: the mii_bus struct 1108 * @addr: the phy address 1109 * @devad: device address to read 1110 * @regnum: register number to read 1111 * 1112 * NOTE: MUST NOT be called from interrupt context, 1113 * because the bus read/write functions may wait for an interrupt 1114 * to conclude the operation. 1115 */ 1116 int mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum) 1117 { 1118 int retval; 1119 1120 mutex_lock(&bus->mdio_lock); 1121 retval = __mdiobus_c45_read(bus, addr, devad, regnum); 1122 mutex_unlock(&bus->mdio_lock); 1123 1124 return retval; 1125 } 1126 EXPORT_SYMBOL(mdiobus_c45_read); 1127 1128 /** 1129 * mdiobus_c45_read_nested - Nested version of the mdiobus_c45_read function 1130 * @bus: the mii_bus struct 1131 * @addr: the phy address 1132 * @devad: device address to read 1133 * @regnum: register number to read 1134 * 1135 * In case of nested MDIO bus access avoid lockdep false positives by 1136 * using mutex_lock_nested(). 1137 * 1138 * NOTE: MUST NOT be called from interrupt context, 1139 * because the bus read/write functions may wait for an interrupt 1140 * to conclude the operation. 1141 */ 1142 int mdiobus_c45_read_nested(struct mii_bus *bus, int addr, int devad, 1143 u32 regnum) 1144 { 1145 int retval; 1146 1147 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); 1148 retval = __mdiobus_c45_read(bus, addr, devad, regnum); 1149 mutex_unlock(&bus->mdio_lock); 1150 1151 return retval; 1152 } 1153 EXPORT_SYMBOL(mdiobus_c45_read_nested); 1154 1155 /** 1156 * mdiobus_write_nested - Nested version of the mdiobus_write function 1157 * @bus: the mii_bus struct 1158 * @addr: the phy address 1159 * @regnum: register number to write 1160 * @val: value to write to @regnum 1161 * 1162 * In case of nested MDIO bus access avoid lockdep false positives by 1163 * using mutex_lock_nested(). 1164 * 1165 * NOTE: MUST NOT be called from interrupt context, 1166 * because the bus read/write functions may wait for an interrupt 1167 * to conclude the operation. 1168 */ 1169 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val) 1170 { 1171 int err; 1172 1173 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); 1174 err = __mdiobus_write(bus, addr, regnum, val); 1175 mutex_unlock(&bus->mdio_lock); 1176 1177 return err; 1178 } 1179 EXPORT_SYMBOL(mdiobus_write_nested); 1180 1181 /** 1182 * mdiobus_write - Convenience function for writing a given MII mgmt register 1183 * @bus: the mii_bus struct 1184 * @addr: the phy address 1185 * @regnum: register number to write 1186 * @val: value to write to @regnum 1187 * 1188 * NOTE: MUST NOT be called from interrupt context, 1189 * because the bus read/write functions may wait for an interrupt 1190 * to conclude the operation. 1191 */ 1192 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) 1193 { 1194 int err; 1195 1196 mutex_lock(&bus->mdio_lock); 1197 err = __mdiobus_write(bus, addr, regnum, val); 1198 mutex_unlock(&bus->mdio_lock); 1199 1200 return err; 1201 } 1202 EXPORT_SYMBOL(mdiobus_write); 1203 1204 /** 1205 * mdiobus_c45_write - Convenience function for writing a given MII mgmt register 1206 * @bus: the mii_bus struct 1207 * @addr: the phy address 1208 * @devad: device address to read 1209 * @regnum: register number to write 1210 * @val: value to write to @regnum 1211 * 1212 * NOTE: MUST NOT be called from interrupt context, 1213 * because the bus read/write functions may wait for an interrupt 1214 * to conclude the operation. 1215 */ 1216 int mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum, 1217 u16 val) 1218 { 1219 int err; 1220 1221 mutex_lock(&bus->mdio_lock); 1222 err = __mdiobus_c45_write(bus, addr, devad, regnum, val); 1223 mutex_unlock(&bus->mdio_lock); 1224 1225 return err; 1226 } 1227 EXPORT_SYMBOL(mdiobus_c45_write); 1228 1229 /** 1230 * mdiobus_c45_write_nested - Nested version of the mdiobus_c45_write function 1231 * @bus: the mii_bus struct 1232 * @addr: the phy address 1233 * @devad: device address to read 1234 * @regnum: register number to write 1235 * @val: value to write to @regnum 1236 * 1237 * In case of nested MDIO bus access avoid lockdep false positives by 1238 * using mutex_lock_nested(). 1239 * 1240 * NOTE: MUST NOT be called from interrupt context, 1241 * because the bus read/write functions may wait for an interrupt 1242 * to conclude the operation. 1243 */ 1244 int mdiobus_c45_write_nested(struct mii_bus *bus, int addr, int devad, 1245 u32 regnum, u16 val) 1246 { 1247 int err; 1248 1249 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); 1250 err = __mdiobus_c45_write(bus, addr, devad, regnum, val); 1251 mutex_unlock(&bus->mdio_lock); 1252 1253 return err; 1254 } 1255 EXPORT_SYMBOL(mdiobus_c45_write_nested); 1256 1257 /* 1258 * __mdiobus_modify - Convenience function for modifying a given mdio device 1259 * register 1260 * @bus: the mii_bus struct 1261 * @addr: the phy address 1262 * @regnum: register number to write 1263 * @mask: bit mask of bits to clear 1264 * @set: bit mask of bits to set 1265 */ 1266 int __mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, 1267 u16 set) 1268 { 1269 int err; 1270 1271 err = __mdiobus_modify_changed(bus, addr, regnum, mask, set); 1272 1273 return err < 0 ? err : 0; 1274 } 1275 EXPORT_SYMBOL_GPL(__mdiobus_modify); 1276 1277 /** 1278 * mdiobus_modify - Convenience function for modifying a given mdio device 1279 * register 1280 * @bus: the mii_bus struct 1281 * @addr: the phy address 1282 * @regnum: register number to write 1283 * @mask: bit mask of bits to clear 1284 * @set: bit mask of bits to set 1285 */ 1286 int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set) 1287 { 1288 int err; 1289 1290 mutex_lock(&bus->mdio_lock); 1291 err = __mdiobus_modify(bus, addr, regnum, mask, set); 1292 mutex_unlock(&bus->mdio_lock); 1293 1294 return err; 1295 } 1296 EXPORT_SYMBOL_GPL(mdiobus_modify); 1297 1298 /** 1299 * mdiobus_c45_modify - Convenience function for modifying a given mdio device 1300 * register 1301 * @bus: the mii_bus struct 1302 * @addr: the phy address 1303 * @devad: device address to read 1304 * @regnum: register number to write 1305 * @mask: bit mask of bits to clear 1306 * @set: bit mask of bits to set 1307 */ 1308 int mdiobus_c45_modify(struct mii_bus *bus, int addr, int devad, u32 regnum, 1309 u16 mask, u16 set) 1310 { 1311 int err; 1312 1313 mutex_lock(&bus->mdio_lock); 1314 err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum, 1315 mask, set); 1316 mutex_unlock(&bus->mdio_lock); 1317 1318 return err < 0 ? err : 0; 1319 } 1320 EXPORT_SYMBOL_GPL(mdiobus_c45_modify); 1321 1322 /** 1323 * mdiobus_modify_changed - Convenience function for modifying a given mdio 1324 * device register and returning if it changed 1325 * @bus: the mii_bus struct 1326 * @addr: the phy address 1327 * @regnum: register number to write 1328 * @mask: bit mask of bits to clear 1329 * @set: bit mask of bits to set 1330 */ 1331 int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum, 1332 u16 mask, u16 set) 1333 { 1334 int err; 1335 1336 mutex_lock(&bus->mdio_lock); 1337 err = __mdiobus_modify_changed(bus, addr, regnum, mask, set); 1338 mutex_unlock(&bus->mdio_lock); 1339 1340 return err; 1341 } 1342 EXPORT_SYMBOL_GPL(mdiobus_modify_changed); 1343 1344 /** 1345 * mdiobus_c45_modify_changed - Convenience function for modifying a given mdio 1346 * device register and returning if it changed 1347 * @bus: the mii_bus struct 1348 * @addr: the phy address 1349 * @devad: device address to read 1350 * @regnum: register number to write 1351 * @mask: bit mask of bits to clear 1352 * @set: bit mask of bits to set 1353 */ 1354 int mdiobus_c45_modify_changed(struct mii_bus *bus, int addr, int devad, 1355 u32 regnum, u16 mask, u16 set) 1356 { 1357 int err; 1358 1359 mutex_lock(&bus->mdio_lock); 1360 err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum, mask, set); 1361 mutex_unlock(&bus->mdio_lock); 1362 1363 return err; 1364 } 1365 EXPORT_SYMBOL_GPL(mdiobus_c45_modify_changed); 1366 1367 /** 1368 * mdio_bus_match - determine if given MDIO driver supports the given 1369 * MDIO device 1370 * @dev: target MDIO device 1371 * @drv: given MDIO driver 1372 * 1373 * Description: Given a MDIO device, and a MDIO driver, return 1 if 1374 * the driver supports the device. Otherwise, return 0. This may 1375 * require calling the devices own match function, since different classes 1376 * of MDIO devices have different match criteria. 1377 */ 1378 static int mdio_bus_match(struct device *dev, const struct device_driver *drv) 1379 { 1380 const struct mdio_driver *mdiodrv = to_mdio_driver(drv); 1381 struct mdio_device *mdio = to_mdio_device(dev); 1382 1383 /* Both the driver and device must type-match */ 1384 if (!(mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) != 1385 !(mdio->flags & MDIO_DEVICE_FLAG_PHY)) 1386 return 0; 1387 1388 if (of_driver_match_device(dev, drv)) 1389 return 1; 1390 1391 if (mdio->bus_match) 1392 return mdio->bus_match(dev, drv); 1393 1394 return 0; 1395 } 1396 1397 static int mdio_uevent(const struct device *dev, struct kobj_uevent_env *env) 1398 { 1399 int rc; 1400 1401 /* Some devices have extra OF data and an OF-style MODALIAS */ 1402 rc = of_device_uevent_modalias(dev, env); 1403 if (rc != -ENODEV) 1404 return rc; 1405 1406 return 0; 1407 } 1408 1409 static struct attribute *mdio_bus_device_statistics_attrs[] = { 1410 &dev_attr_mdio_bus_device_transfers.attr.attr, 1411 &dev_attr_mdio_bus_device_errors.attr.attr, 1412 &dev_attr_mdio_bus_device_writes.attr.attr, 1413 &dev_attr_mdio_bus_device_reads.attr.attr, 1414 NULL, 1415 }; 1416 1417 static const struct attribute_group mdio_bus_device_statistics_group = { 1418 .name = "statistics", 1419 .attrs = mdio_bus_device_statistics_attrs, 1420 }; 1421 1422 static const struct attribute_group *mdio_bus_dev_groups[] = { 1423 &mdio_bus_device_statistics_group, 1424 NULL, 1425 }; 1426 1427 const struct bus_type mdio_bus_type = { 1428 .name = "mdio_bus", 1429 .dev_groups = mdio_bus_dev_groups, 1430 .match = mdio_bus_match, 1431 .uevent = mdio_uevent, 1432 }; 1433 EXPORT_SYMBOL(mdio_bus_type); 1434 1435 int __init mdio_bus_init(void) 1436 { 1437 int ret; 1438 1439 ret = class_register(&mdio_bus_class); 1440 if (!ret) { 1441 ret = bus_register(&mdio_bus_type); 1442 if (ret) 1443 class_unregister(&mdio_bus_class); 1444 } 1445 1446 return ret; 1447 } 1448 1449 #if IS_ENABLED(CONFIG_PHYLIB) 1450 void mdio_bus_exit(void) 1451 { 1452 class_unregister(&mdio_bus_class); 1453 bus_unregister(&mdio_bus_type); 1454 } 1455 EXPORT_SYMBOL_GPL(mdio_bus_exit); 1456 #else 1457 module_init(mdio_bus_init); 1458 /* no module_exit, intentional */ 1459 MODULE_LICENSE("GPL"); 1460 MODULE_DESCRIPTION("MDIO bus/device layer"); 1461 #endif 1462