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