1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * OF helpers for the MDIO (Ethernet PHY) API 4 * 5 * Copyright (c) 2009 Secret Lab Technologies, Ltd. 6 * 7 * This file provides helper functions for extracting PHY device information 8 * out of the OpenFirmware device tree and using it to populate an mii_bus. 9 */ 10 11 #include <linux/device.h> 12 #include <linux/err.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/netdevice.h> 16 #include <linux/of.h> 17 #include <linux/of_irq.h> 18 #include <linux/of_mdio.h> 19 #include <linux/of_net.h> 20 #include <linux/phy.h> 21 #include <linux/phy_fixed.h> 22 23 #define DEFAULT_GPIO_RESET_DELAY 10 /* in microseconds */ 24 25 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); 26 MODULE_LICENSE("GPL"); 27 28 /* Extract the clause 22 phy ID from the compatible string of the form 29 * ethernet-phy-idAAAA.BBBB */ 30 static int of_get_phy_id(struct device_node *device, u32 *phy_id) 31 { 32 struct property *prop; 33 const char *cp; 34 unsigned int upper, lower; 35 36 of_property_for_each_string(device, "compatible", prop, cp) { 37 if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) { 38 *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF); 39 return 0; 40 } 41 } 42 return -EINVAL; 43 } 44 45 static struct mii_timestamper *of_find_mii_timestamper(struct device_node *node) 46 { 47 struct of_phandle_args arg; 48 int err; 49 50 err = of_parse_phandle_with_fixed_args(node, "timestamper", 1, 0, &arg); 51 52 if (err == -ENOENT) 53 return NULL; 54 else if (err) 55 return ERR_PTR(err); 56 57 if (arg.args_count != 1) 58 return ERR_PTR(-EINVAL); 59 60 return register_mii_timestamper(arg.np, arg.args[0]); 61 } 62 63 int of_mdiobus_phy_device_register(struct mii_bus *mdio, struct phy_device *phy, 64 struct device_node *child, u32 addr) 65 { 66 int rc; 67 68 rc = of_irq_get(child, 0); 69 if (rc == -EPROBE_DEFER) 70 return rc; 71 72 if (rc > 0) { 73 phy->irq = rc; 74 mdio->irq[addr] = rc; 75 } else { 76 phy->irq = mdio->irq[addr]; 77 } 78 79 if (of_property_read_bool(child, "broken-turn-around")) 80 mdio->phy_ignore_ta_mask |= 1 << addr; 81 82 of_property_read_u32(child, "reset-assert-us", 83 &phy->mdio.reset_assert_delay); 84 of_property_read_u32(child, "reset-deassert-us", 85 &phy->mdio.reset_deassert_delay); 86 87 /* Associate the OF node with the device structure so it 88 * can be looked up later */ 89 of_node_get(child); 90 phy->mdio.dev.of_node = child; 91 phy->mdio.dev.fwnode = of_fwnode_handle(child); 92 93 /* All data is now stored in the phy struct; 94 * register it */ 95 rc = phy_device_register(phy); 96 if (rc) { 97 of_node_put(child); 98 return rc; 99 } 100 101 dev_dbg(&mdio->dev, "registered phy %pOFn at address %i\n", 102 child, addr); 103 return 0; 104 } 105 EXPORT_SYMBOL(of_mdiobus_phy_device_register); 106 107 static int of_mdiobus_register_phy(struct mii_bus *mdio, 108 struct device_node *child, u32 addr) 109 { 110 struct mii_timestamper *mii_ts; 111 struct phy_device *phy; 112 bool is_c45; 113 int rc; 114 u32 phy_id; 115 116 mii_ts = of_find_mii_timestamper(child); 117 if (IS_ERR(mii_ts)) 118 return PTR_ERR(mii_ts); 119 120 is_c45 = of_device_is_compatible(child, 121 "ethernet-phy-ieee802.3-c45"); 122 123 if (!is_c45 && !of_get_phy_id(child, &phy_id)) 124 phy = phy_device_create(mdio, addr, phy_id, 0, NULL); 125 else 126 phy = get_phy_device(mdio, addr, is_c45); 127 if (IS_ERR(phy)) { 128 if (mii_ts) 129 unregister_mii_timestamper(mii_ts); 130 return PTR_ERR(phy); 131 } 132 133 rc = of_mdiobus_phy_device_register(mdio, phy, child, addr); 134 if (rc) { 135 if (mii_ts) 136 unregister_mii_timestamper(mii_ts); 137 phy_device_free(phy); 138 return rc; 139 } 140 141 /* phy->mii_ts may already be defined by the PHY driver. A 142 * mii_timestamper probed via the device tree will still have 143 * precedence. 144 */ 145 if (mii_ts) 146 phy->mii_ts = mii_ts; 147 148 return 0; 149 } 150 151 static int of_mdiobus_register_device(struct mii_bus *mdio, 152 struct device_node *child, u32 addr) 153 { 154 struct mdio_device *mdiodev; 155 int rc; 156 157 mdiodev = mdio_device_create(mdio, addr); 158 if (IS_ERR(mdiodev)) 159 return PTR_ERR(mdiodev); 160 161 /* Associate the OF node with the device structure so it 162 * can be looked up later. 163 */ 164 of_node_get(child); 165 mdiodev->dev.of_node = child; 166 mdiodev->dev.fwnode = of_fwnode_handle(child); 167 168 /* All data is now stored in the mdiodev struct; register it. */ 169 rc = mdio_device_register(mdiodev); 170 if (rc) { 171 mdio_device_free(mdiodev); 172 of_node_put(child); 173 return rc; 174 } 175 176 dev_dbg(&mdio->dev, "registered mdio device %pOFn at address %i\n", 177 child, addr); 178 return 0; 179 } 180 181 /* The following is a list of PHY compatible strings which appear in 182 * some DTBs. The compatible string is never matched against a PHY 183 * driver, so is pointless. We only expect devices which are not PHYs 184 * to have a compatible string, so they can be matched to an MDIO 185 * driver. Encourage users to upgrade their DT blobs to remove these. 186 */ 187 static const struct of_device_id whitelist_phys[] = { 188 { .compatible = "brcm,40nm-ephy" }, 189 { .compatible = "broadcom,bcm5241" }, 190 { .compatible = "marvell,88E1111", }, 191 { .compatible = "marvell,88e1116", }, 192 { .compatible = "marvell,88e1118", }, 193 { .compatible = "marvell,88e1145", }, 194 { .compatible = "marvell,88e1149r", }, 195 { .compatible = "marvell,88e1310", }, 196 { .compatible = "marvell,88E1510", }, 197 { .compatible = "marvell,88E1514", }, 198 { .compatible = "moxa,moxart-rtl8201cp", }, 199 {} 200 }; 201 202 /* 203 * Return true if the child node is for a phy. It must either: 204 * o Compatible string of "ethernet-phy-idX.X" 205 * o Compatible string of "ethernet-phy-ieee802.3-c45" 206 * o Compatible string of "ethernet-phy-ieee802.3-c22" 207 * o In the white list above (and issue a warning) 208 * o No compatibility string 209 * 210 * A device which is not a phy is expected to have a compatible string 211 * indicating what sort of device it is. 212 */ 213 bool of_mdiobus_child_is_phy(struct device_node *child) 214 { 215 u32 phy_id; 216 217 if (of_get_phy_id(child, &phy_id) != -EINVAL) 218 return true; 219 220 if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c45")) 221 return true; 222 223 if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22")) 224 return true; 225 226 if (of_match_node(whitelist_phys, child)) { 227 pr_warn(FW_WARN 228 "%pOF: Whitelisted compatible string. Please remove\n", 229 child); 230 return true; 231 } 232 233 if (!of_find_property(child, "compatible", NULL)) 234 return true; 235 236 return false; 237 } 238 EXPORT_SYMBOL(of_mdiobus_child_is_phy); 239 240 /** 241 * of_mdiobus_register - Register mii_bus and create PHYs from the device tree 242 * @mdio: pointer to mii_bus structure 243 * @np: pointer to device_node of MDIO bus. 244 * 245 * This function registers the mii_bus structure and registers a phy_device 246 * for each child node of @np. 247 */ 248 int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np) 249 { 250 struct device_node *child; 251 bool scanphys = false; 252 int addr, rc; 253 254 if (!np) 255 return mdiobus_register(mdio); 256 257 /* Do not continue if the node is disabled */ 258 if (!of_device_is_available(np)) 259 return -ENODEV; 260 261 /* Mask out all PHYs from auto probing. Instead the PHYs listed in 262 * the device tree are populated after the bus has been registered */ 263 mdio->phy_mask = ~0; 264 265 mdio->dev.of_node = np; 266 mdio->dev.fwnode = of_fwnode_handle(np); 267 268 /* Get bus level PHY reset GPIO details */ 269 mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY; 270 of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us); 271 mdio->reset_post_delay_us = 0; 272 of_property_read_u32(np, "reset-post-delay-us", &mdio->reset_post_delay_us); 273 274 /* Register the MDIO bus */ 275 rc = mdiobus_register(mdio); 276 if (rc) 277 return rc; 278 279 /* Loop over the child nodes and register a phy_device for each phy */ 280 for_each_available_child_of_node(np, child) { 281 addr = of_mdio_parse_addr(&mdio->dev, child); 282 if (addr < 0) { 283 scanphys = true; 284 continue; 285 } 286 287 if (of_mdiobus_child_is_phy(child)) 288 rc = of_mdiobus_register_phy(mdio, child, addr); 289 else 290 rc = of_mdiobus_register_device(mdio, child, addr); 291 292 if (rc == -ENODEV) 293 dev_err(&mdio->dev, 294 "MDIO device at address %d is missing.\n", 295 addr); 296 else if (rc) 297 goto unregister; 298 } 299 300 if (!scanphys) 301 return 0; 302 303 /* auto scan for PHYs with empty reg property */ 304 for_each_available_child_of_node(np, child) { 305 /* Skip PHYs with reg property set */ 306 if (of_find_property(child, "reg", NULL)) 307 continue; 308 309 for (addr = 0; addr < PHY_MAX_ADDR; addr++) { 310 /* skip already registered PHYs */ 311 if (mdiobus_is_registered_device(mdio, addr)) 312 continue; 313 314 /* be noisy to encourage people to set reg property */ 315 dev_info(&mdio->dev, "scan phy %pOFn at address %i\n", 316 child, addr); 317 318 if (of_mdiobus_child_is_phy(child)) { 319 /* -ENODEV is the return code that PHYLIB has 320 * standardized on to indicate that bus 321 * scanning should continue. 322 */ 323 rc = of_mdiobus_register_phy(mdio, child, addr); 324 if (!rc) 325 break; 326 if (rc != -ENODEV) 327 goto unregister; 328 } 329 } 330 } 331 332 return 0; 333 334 unregister: 335 mdiobus_unregister(mdio); 336 return rc; 337 } 338 EXPORT_SYMBOL(of_mdiobus_register); 339 340 /** 341 * of_mdio_find_device - Given a device tree node, find the mdio_device 342 * @np: pointer to the mdio_device's device tree node 343 * 344 * If successful, returns a pointer to the mdio_device with the embedded 345 * struct device refcount incremented by one, or NULL on failure. 346 * The caller should call put_device() on the mdio_device after its use 347 */ 348 struct mdio_device *of_mdio_find_device(struct device_node *np) 349 { 350 struct device *d; 351 352 if (!np) 353 return NULL; 354 355 d = bus_find_device_by_of_node(&mdio_bus_type, np); 356 if (!d) 357 return NULL; 358 359 return to_mdio_device(d); 360 } 361 EXPORT_SYMBOL(of_mdio_find_device); 362 363 /** 364 * of_phy_find_device - Give a PHY node, find the phy_device 365 * @phy_np: Pointer to the phy's device tree node 366 * 367 * If successful, returns a pointer to the phy_device with the embedded 368 * struct device refcount incremented by one, or NULL on failure. 369 */ 370 struct phy_device *of_phy_find_device(struct device_node *phy_np) 371 { 372 struct mdio_device *mdiodev; 373 374 mdiodev = of_mdio_find_device(phy_np); 375 if (!mdiodev) 376 return NULL; 377 378 if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) 379 return to_phy_device(&mdiodev->dev); 380 381 put_device(&mdiodev->dev); 382 383 return NULL; 384 } 385 EXPORT_SYMBOL(of_phy_find_device); 386 387 /** 388 * of_phy_connect - Connect to the phy described in the device tree 389 * @dev: pointer to net_device claiming the phy 390 * @phy_np: Pointer to device tree node for the PHY 391 * @hndlr: Link state callback for the network device 392 * @flags: flags to pass to the PHY 393 * @iface: PHY data interface type 394 * 395 * If successful, returns a pointer to the phy_device with the embedded 396 * struct device refcount incremented by one, or NULL on failure. The 397 * refcount must be dropped by calling phy_disconnect() or phy_detach(). 398 */ 399 struct phy_device *of_phy_connect(struct net_device *dev, 400 struct device_node *phy_np, 401 void (*hndlr)(struct net_device *), u32 flags, 402 phy_interface_t iface) 403 { 404 struct phy_device *phy = of_phy_find_device(phy_np); 405 int ret; 406 407 if (!phy) 408 return NULL; 409 410 phy->dev_flags |= flags; 411 412 ret = phy_connect_direct(dev, phy, hndlr, iface); 413 414 /* refcount is held by phy_connect_direct() on success */ 415 put_device(&phy->mdio.dev); 416 417 return ret ? NULL : phy; 418 } 419 EXPORT_SYMBOL(of_phy_connect); 420 421 /** 422 * of_phy_get_and_connect 423 * - Get phy node and connect to the phy described in the device tree 424 * @dev: pointer to net_device claiming the phy 425 * @np: Pointer to device tree node for the net_device claiming the phy 426 * @hndlr: Link state callback for the network device 427 * 428 * If successful, returns a pointer to the phy_device with the embedded 429 * struct device refcount incremented by one, or NULL on failure. The 430 * refcount must be dropped by calling phy_disconnect() or phy_detach(). 431 */ 432 struct phy_device *of_phy_get_and_connect(struct net_device *dev, 433 struct device_node *np, 434 void (*hndlr)(struct net_device *)) 435 { 436 phy_interface_t iface; 437 struct device_node *phy_np; 438 struct phy_device *phy; 439 int ret; 440 441 ret = of_get_phy_mode(np, &iface); 442 if (ret) 443 return NULL; 444 if (of_phy_is_fixed_link(np)) { 445 ret = of_phy_register_fixed_link(np); 446 if (ret < 0) { 447 netdev_err(dev, "broken fixed-link specification\n"); 448 return NULL; 449 } 450 phy_np = of_node_get(np); 451 } else { 452 phy_np = of_parse_phandle(np, "phy-handle", 0); 453 if (!phy_np) 454 return NULL; 455 } 456 457 phy = of_phy_connect(dev, phy_np, hndlr, 0, iface); 458 459 of_node_put(phy_np); 460 461 return phy; 462 } 463 EXPORT_SYMBOL(of_phy_get_and_connect); 464 465 /* 466 * of_phy_is_fixed_link() and of_phy_register_fixed_link() must 467 * support two DT bindings: 468 * - the old DT binding, where 'fixed-link' was a property with 5 469 * cells encoding various informations about the fixed PHY 470 * - the new DT binding, where 'fixed-link' is a sub-node of the 471 * Ethernet device. 472 */ 473 bool of_phy_is_fixed_link(struct device_node *np) 474 { 475 struct device_node *dn; 476 int len, err; 477 const char *managed; 478 479 /* New binding */ 480 dn = of_get_child_by_name(np, "fixed-link"); 481 if (dn) { 482 of_node_put(dn); 483 return true; 484 } 485 486 err = of_property_read_string(np, "managed", &managed); 487 if (err == 0 && strcmp(managed, "auto") != 0) 488 return true; 489 490 /* Old binding */ 491 if (of_get_property(np, "fixed-link", &len) && 492 len == (5 * sizeof(__be32))) 493 return true; 494 495 return false; 496 } 497 EXPORT_SYMBOL(of_phy_is_fixed_link); 498 499 int of_phy_register_fixed_link(struct device_node *np) 500 { 501 struct fixed_phy_status status = {}; 502 struct device_node *fixed_link_node; 503 u32 fixed_link_prop[5]; 504 const char *managed; 505 506 if (of_property_read_string(np, "managed", &managed) == 0 && 507 strcmp(managed, "in-band-status") == 0) { 508 /* status is zeroed, namely its .link member */ 509 goto register_phy; 510 } 511 512 /* New binding */ 513 fixed_link_node = of_get_child_by_name(np, "fixed-link"); 514 if (fixed_link_node) { 515 status.link = 1; 516 status.duplex = of_property_read_bool(fixed_link_node, 517 "full-duplex"); 518 if (of_property_read_u32(fixed_link_node, "speed", 519 &status.speed)) { 520 of_node_put(fixed_link_node); 521 return -EINVAL; 522 } 523 status.pause = of_property_read_bool(fixed_link_node, "pause"); 524 status.asym_pause = of_property_read_bool(fixed_link_node, 525 "asym-pause"); 526 of_node_put(fixed_link_node); 527 528 goto register_phy; 529 } 530 531 /* Old binding */ 532 if (of_property_read_u32_array(np, "fixed-link", fixed_link_prop, 533 ARRAY_SIZE(fixed_link_prop)) == 0) { 534 status.link = 1; 535 status.duplex = fixed_link_prop[1]; 536 status.speed = fixed_link_prop[2]; 537 status.pause = fixed_link_prop[3]; 538 status.asym_pause = fixed_link_prop[4]; 539 goto register_phy; 540 } 541 542 return -ENODEV; 543 544 register_phy: 545 return PTR_ERR_OR_ZERO(fixed_phy_register(PHY_POLL, &status, np)); 546 } 547 EXPORT_SYMBOL(of_phy_register_fixed_link); 548 549 void of_phy_deregister_fixed_link(struct device_node *np) 550 { 551 struct phy_device *phydev; 552 553 phydev = of_phy_find_device(np); 554 if (!phydev) 555 return; 556 557 fixed_phy_unregister(phydev); 558 559 put_device(&phydev->mdio.dev); /* of_phy_find_device() */ 560 phy_device_free(phydev); /* fixed_phy_register() */ 561 } 562 EXPORT_SYMBOL(of_phy_deregister_fixed_link); 563