phy_device.c 20 KB

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  1. /*
  2. * drivers/net/phy/phy_device.c
  3. *
  4. * Framework for finding and configuring PHYs.
  5. * Also contains generic PHY driver
  6. *
  7. * Author: Andy Fleming
  8. *
  9. * Copyright (c) 2004 Freescale Semiconductor, Inc.
  10. *
  11. * This program is free software; you can redistribute it and/or modify it
  12. * under the terms of the GNU General Public License as published by the
  13. * Free Software Foundation; either version 2 of the License, or (at your
  14. * option) any later version.
  15. *
  16. */
  17. #include <linux/kernel.h>
  18. #include <linux/string.h>
  19. #include <linux/errno.h>
  20. #include <linux/unistd.h>
  21. #include <linux/slab.h>
  22. #include <linux/interrupt.h>
  23. #include <linux/init.h>
  24. #include <linux/delay.h>
  25. #include <linux/netdevice.h>
  26. #include <linux/etherdevice.h>
  27. #include <linux/skbuff.h>
  28. #include <linux/mm.h>
  29. #include <linux/module.h>
  30. #include <linux/mii.h>
  31. #include <linux/ethtool.h>
  32. #include <linux/phy.h>
  33. #include <asm/io.h>
  34. #include <asm/irq.h>
  35. #include <asm/uaccess.h>
  36. MODULE_DESCRIPTION("PHY library");
  37. MODULE_AUTHOR("Andy Fleming");
  38. MODULE_LICENSE("GPL");
  39. static struct phy_driver genphy_driver;
  40. extern int mdio_bus_init(void);
  41. extern void mdio_bus_exit(void);
  42. void phy_device_free(struct phy_device *phydev)
  43. {
  44. kfree(phydev);
  45. }
  46. static void phy_device_release(struct device *dev)
  47. {
  48. phy_device_free(to_phy_device(dev));
  49. }
  50. static LIST_HEAD(phy_fixup_list);
  51. static DEFINE_MUTEX(phy_fixup_lock);
  52. /*
  53. * Creates a new phy_fixup and adds it to the list
  54. * @bus_id: A string which matches phydev->dev.bus_id (or PHY_ANY_ID)
  55. * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
  56. * It can also be PHY_ANY_UID
  57. * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
  58. * comparison
  59. * @run: The actual code to be run when a matching PHY is found
  60. */
  61. int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
  62. int (*run)(struct phy_device *))
  63. {
  64. struct phy_fixup *fixup;
  65. fixup = kzalloc(sizeof(struct phy_fixup), GFP_KERNEL);
  66. if (!fixup)
  67. return -ENOMEM;
  68. strncpy(fixup->bus_id, bus_id, BUS_ID_SIZE);
  69. fixup->phy_uid = phy_uid;
  70. fixup->phy_uid_mask = phy_uid_mask;
  71. fixup->run = run;
  72. mutex_lock(&phy_fixup_lock);
  73. list_add_tail(&fixup->list, &phy_fixup_list);
  74. mutex_unlock(&phy_fixup_lock);
  75. return 0;
  76. }
  77. EXPORT_SYMBOL(phy_register_fixup);
  78. /* Registers a fixup to be run on any PHY with the UID in phy_uid */
  79. int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
  80. int (*run)(struct phy_device *))
  81. {
  82. return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run);
  83. }
  84. EXPORT_SYMBOL(phy_register_fixup_for_uid);
  85. /* Registers a fixup to be run on the PHY with id string bus_id */
  86. int phy_register_fixup_for_id(const char *bus_id,
  87. int (*run)(struct phy_device *))
  88. {
  89. return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run);
  90. }
  91. EXPORT_SYMBOL(phy_register_fixup_for_id);
  92. /*
  93. * Returns 1 if fixup matches phydev in bus_id and phy_uid.
  94. * Fixups can be set to match any in one or more fields.
  95. */
  96. static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
  97. {
  98. if (strcmp(fixup->bus_id, phydev->dev.bus_id) != 0)
  99. if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
  100. return 0;
  101. if ((fixup->phy_uid & fixup->phy_uid_mask) !=
  102. (phydev->phy_id & fixup->phy_uid_mask))
  103. if (fixup->phy_uid != PHY_ANY_UID)
  104. return 0;
  105. return 1;
  106. }
  107. /* Runs any matching fixups for this phydev */
  108. int phy_scan_fixups(struct phy_device *phydev)
  109. {
  110. struct phy_fixup *fixup;
  111. mutex_lock(&phy_fixup_lock);
  112. list_for_each_entry(fixup, &phy_fixup_list, list) {
  113. if (phy_needs_fixup(phydev, fixup)) {
  114. int err;
  115. err = fixup->run(phydev);
  116. if (err < 0)
  117. return err;
  118. }
  119. }
  120. mutex_unlock(&phy_fixup_lock);
  121. return 0;
  122. }
  123. EXPORT_SYMBOL(phy_scan_fixups);
  124. struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id)
  125. {
  126. struct phy_device *dev;
  127. /* We allocate the device, and initialize the
  128. * default values */
  129. dev = kzalloc(sizeof(*dev), GFP_KERNEL);
  130. if (NULL == dev)
  131. return (struct phy_device*) PTR_ERR((void*)-ENOMEM);
  132. dev->dev.release = phy_device_release;
  133. dev->speed = 0;
  134. dev->duplex = -1;
  135. dev->pause = dev->asym_pause = 0;
  136. dev->link = 1;
  137. dev->interface = PHY_INTERFACE_MODE_GMII;
  138. dev->autoneg = AUTONEG_ENABLE;
  139. dev->addr = addr;
  140. dev->phy_id = phy_id;
  141. dev->bus = bus;
  142. dev->state = PHY_DOWN;
  143. mutex_init(&dev->lock);
  144. return dev;
  145. }
  146. EXPORT_SYMBOL(phy_device_create);
  147. /**
  148. * get_phy_id - reads the specified addr for its ID.
  149. * @bus: the target MII bus
  150. * @addr: PHY address on the MII bus
  151. * @phy_id: where to store the ID retrieved.
  152. *
  153. * Description: Reads the ID registers of the PHY at @addr on the
  154. * @bus, stores it in @phy_id and returns zero on success.
  155. */
  156. int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id)
  157. {
  158. int phy_reg;
  159. /* Grab the bits from PHYIR1, and put them
  160. * in the upper half */
  161. phy_reg = bus->read(bus, addr, MII_PHYSID1);
  162. if (phy_reg < 0)
  163. return -EIO;
  164. *phy_id = (phy_reg & 0xffff) << 16;
  165. /* Grab the bits from PHYIR2, and put them in the lower half */
  166. phy_reg = bus->read(bus, addr, MII_PHYSID2);
  167. if (phy_reg < 0)
  168. return -EIO;
  169. *phy_id |= (phy_reg & 0xffff);
  170. return 0;
  171. }
  172. /**
  173. * get_phy_device - reads the specified PHY device and returns its @phy_device struct
  174. * @bus: the target MII bus
  175. * @addr: PHY address on the MII bus
  176. *
  177. * Description: Reads the ID registers of the PHY at @addr on the
  178. * @bus, then allocates and returns the phy_device to represent it.
  179. */
  180. struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
  181. {
  182. struct phy_device *dev = NULL;
  183. u32 phy_id;
  184. int r;
  185. r = get_phy_id(bus, addr, &phy_id);
  186. if (r)
  187. return ERR_PTR(r);
  188. /* If the phy_id is all Fs, there is no device there */
  189. if (0xffffffff == phy_id)
  190. return NULL;
  191. dev = phy_device_create(bus, addr, phy_id);
  192. return dev;
  193. }
  194. /**
  195. * phy_prepare_link - prepares the PHY layer to monitor link status
  196. * @phydev: target phy_device struct
  197. * @handler: callback function for link status change notifications
  198. *
  199. * Description: Tells the PHY infrastructure to handle the
  200. * gory details on monitoring link status (whether through
  201. * polling or an interrupt), and to call back to the
  202. * connected device driver when the link status changes.
  203. * If you want to monitor your own link state, don't call
  204. * this function.
  205. */
  206. void phy_prepare_link(struct phy_device *phydev,
  207. void (*handler)(struct net_device *))
  208. {
  209. phydev->adjust_link = handler;
  210. }
  211. /**
  212. * phy_connect - connect an ethernet device to a PHY device
  213. * @dev: the network device to connect
  214. * @bus_id: the id string of the PHY device to connect
  215. * @handler: callback function for state change notifications
  216. * @flags: PHY device's dev_flags
  217. * @interface: PHY device's interface
  218. *
  219. * Description: Convenience function for connecting ethernet
  220. * devices to PHY devices. The default behavior is for
  221. * the PHY infrastructure to handle everything, and only notify
  222. * the connected driver when the link status changes. If you
  223. * don't want, or can't use the provided functionality, you may
  224. * choose to call only the subset of functions which provide
  225. * the desired functionality.
  226. */
  227. struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
  228. void (*handler)(struct net_device *), u32 flags,
  229. phy_interface_t interface)
  230. {
  231. struct phy_device *phydev;
  232. phydev = phy_attach(dev, bus_id, flags, interface);
  233. if (IS_ERR(phydev))
  234. return phydev;
  235. phy_prepare_link(phydev, handler);
  236. phy_start_machine(phydev, NULL);
  237. if (phydev->irq > 0)
  238. phy_start_interrupts(phydev);
  239. return phydev;
  240. }
  241. EXPORT_SYMBOL(phy_connect);
  242. /**
  243. * phy_disconnect - disable interrupts, stop state machine, and detach a PHY device
  244. * @phydev: target phy_device struct
  245. */
  246. void phy_disconnect(struct phy_device *phydev)
  247. {
  248. if (phydev->irq > 0)
  249. phy_stop_interrupts(phydev);
  250. phy_stop_machine(phydev);
  251. phydev->adjust_link = NULL;
  252. phy_detach(phydev);
  253. }
  254. EXPORT_SYMBOL(phy_disconnect);
  255. static int phy_compare_id(struct device *dev, void *data)
  256. {
  257. return strcmp((char *)data, dev->bus_id) ? 0 : 1;
  258. }
  259. /**
  260. * phy_attach - attach a network device to a particular PHY device
  261. * @dev: network device to attach
  262. * @bus_id: PHY device to attach
  263. * @flags: PHY device's dev_flags
  264. * @interface: PHY device's interface
  265. *
  266. * Description: Called by drivers to attach to a particular PHY
  267. * device. The phy_device is found, and properly hooked up
  268. * to the phy_driver. If no driver is attached, then the
  269. * genphy_driver is used. The phy_device is given a ptr to
  270. * the attaching device, and given a callback for link status
  271. * change. The phy_device is returned to the attaching driver.
  272. */
  273. struct phy_device *phy_attach(struct net_device *dev,
  274. const char *bus_id, u32 flags, phy_interface_t interface)
  275. {
  276. struct bus_type *bus = &mdio_bus_type;
  277. struct phy_device *phydev;
  278. struct device *d;
  279. /* Search the list of PHY devices on the mdio bus for the
  280. * PHY with the requested name */
  281. d = bus_find_device(bus, NULL, (void *)bus_id, phy_compare_id);
  282. if (d) {
  283. phydev = to_phy_device(d);
  284. } else {
  285. printk(KERN_ERR "%s not found\n", bus_id);
  286. return ERR_PTR(-ENODEV);
  287. }
  288. /* Assume that if there is no driver, that it doesn't
  289. * exist, and we should use the genphy driver. */
  290. if (NULL == d->driver) {
  291. int err;
  292. d->driver = &genphy_driver.driver;
  293. err = d->driver->probe(d);
  294. if (err >= 0)
  295. err = device_bind_driver(d);
  296. if (err)
  297. return ERR_PTR(err);
  298. }
  299. if (phydev->attached_dev) {
  300. printk(KERN_ERR "%s: %s already attached\n",
  301. dev->name, bus_id);
  302. return ERR_PTR(-EBUSY);
  303. }
  304. phydev->attached_dev = dev;
  305. phydev->dev_flags = flags;
  306. phydev->interface = interface;
  307. /* Do initial configuration here, now that
  308. * we have certain key parameters
  309. * (dev_flags and interface) */
  310. if (phydev->drv->config_init) {
  311. int err;
  312. err = phy_scan_fixups(phydev);
  313. if (err < 0)
  314. return ERR_PTR(err);
  315. err = phydev->drv->config_init(phydev);
  316. if (err < 0)
  317. return ERR_PTR(err);
  318. }
  319. return phydev;
  320. }
  321. EXPORT_SYMBOL(phy_attach);
  322. /**
  323. * phy_detach - detach a PHY device from its network device
  324. * @phydev: target phy_device struct
  325. */
  326. void phy_detach(struct phy_device *phydev)
  327. {
  328. phydev->attached_dev = NULL;
  329. /* If the device had no specific driver before (i.e. - it
  330. * was using the generic driver), we unbind the device
  331. * from the generic driver so that there's a chance a
  332. * real driver could be loaded */
  333. if (phydev->dev.driver == &genphy_driver.driver)
  334. device_release_driver(&phydev->dev);
  335. }
  336. EXPORT_SYMBOL(phy_detach);
  337. /* Generic PHY support and helper functions */
  338. /**
  339. * genphy_config_advert - sanitize and advertise auto-negotation parameters
  340. * @phydev: target phy_device struct
  341. *
  342. * Description: Writes MII_ADVERTISE with the appropriate values,
  343. * after sanitizing the values to make sure we only advertise
  344. * what is supported.
  345. */
  346. int genphy_config_advert(struct phy_device *phydev)
  347. {
  348. u32 advertise;
  349. int adv;
  350. int err;
  351. /* Only allow advertising what
  352. * this PHY supports */
  353. phydev->advertising &= phydev->supported;
  354. advertise = phydev->advertising;
  355. /* Setup standard advertisement */
  356. adv = phy_read(phydev, MII_ADVERTISE);
  357. if (adv < 0)
  358. return adv;
  359. adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
  360. ADVERTISE_PAUSE_ASYM);
  361. if (advertise & ADVERTISED_10baseT_Half)
  362. adv |= ADVERTISE_10HALF;
  363. if (advertise & ADVERTISED_10baseT_Full)
  364. adv |= ADVERTISE_10FULL;
  365. if (advertise & ADVERTISED_100baseT_Half)
  366. adv |= ADVERTISE_100HALF;
  367. if (advertise & ADVERTISED_100baseT_Full)
  368. adv |= ADVERTISE_100FULL;
  369. if (advertise & ADVERTISED_Pause)
  370. adv |= ADVERTISE_PAUSE_CAP;
  371. if (advertise & ADVERTISED_Asym_Pause)
  372. adv |= ADVERTISE_PAUSE_ASYM;
  373. err = phy_write(phydev, MII_ADVERTISE, adv);
  374. if (err < 0)
  375. return err;
  376. /* Configure gigabit if it's supported */
  377. if (phydev->supported & (SUPPORTED_1000baseT_Half |
  378. SUPPORTED_1000baseT_Full)) {
  379. adv = phy_read(phydev, MII_CTRL1000);
  380. if (adv < 0)
  381. return adv;
  382. adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
  383. if (advertise & SUPPORTED_1000baseT_Half)
  384. adv |= ADVERTISE_1000HALF;
  385. if (advertise & SUPPORTED_1000baseT_Full)
  386. adv |= ADVERTISE_1000FULL;
  387. err = phy_write(phydev, MII_CTRL1000, adv);
  388. if (err < 0)
  389. return err;
  390. }
  391. return adv;
  392. }
  393. EXPORT_SYMBOL(genphy_config_advert);
  394. /**
  395. * genphy_setup_forced - configures/forces speed/duplex from @phydev
  396. * @phydev: target phy_device struct
  397. *
  398. * Description: Configures MII_BMCR to force speed/duplex
  399. * to the values in phydev. Assumes that the values are valid.
  400. * Please see phy_sanitize_settings().
  401. */
  402. int genphy_setup_forced(struct phy_device *phydev)
  403. {
  404. int err;
  405. int ctl = 0;
  406. phydev->pause = phydev->asym_pause = 0;
  407. if (SPEED_1000 == phydev->speed)
  408. ctl |= BMCR_SPEED1000;
  409. else if (SPEED_100 == phydev->speed)
  410. ctl |= BMCR_SPEED100;
  411. if (DUPLEX_FULL == phydev->duplex)
  412. ctl |= BMCR_FULLDPLX;
  413. err = phy_write(phydev, MII_BMCR, ctl);
  414. if (err < 0)
  415. return err;
  416. /*
  417. * Run the fixups on this PHY, just in case the
  418. * board code needs to change something after a reset
  419. */
  420. err = phy_scan_fixups(phydev);
  421. if (err < 0)
  422. return err;
  423. /* We just reset the device, so we'd better configure any
  424. * settings the PHY requires to operate */
  425. if (phydev->drv->config_init)
  426. err = phydev->drv->config_init(phydev);
  427. return err;
  428. }
  429. /**
  430. * genphy_restart_aneg - Enable and Restart Autonegotiation
  431. * @phydev: target phy_device struct
  432. */
  433. int genphy_restart_aneg(struct phy_device *phydev)
  434. {
  435. int ctl;
  436. ctl = phy_read(phydev, MII_BMCR);
  437. if (ctl < 0)
  438. return ctl;
  439. ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
  440. /* Don't isolate the PHY if we're negotiating */
  441. ctl &= ~(BMCR_ISOLATE);
  442. ctl = phy_write(phydev, MII_BMCR, ctl);
  443. return ctl;
  444. }
  445. /**
  446. * genphy_config_aneg - restart auto-negotiation or write BMCR
  447. * @phydev: target phy_device struct
  448. *
  449. * Description: If auto-negotiation is enabled, we configure the
  450. * advertising, and then restart auto-negotiation. If it is not
  451. * enabled, then we write the BMCR.
  452. */
  453. int genphy_config_aneg(struct phy_device *phydev)
  454. {
  455. int err = 0;
  456. if (AUTONEG_ENABLE == phydev->autoneg) {
  457. err = genphy_config_advert(phydev);
  458. if (err < 0)
  459. return err;
  460. err = genphy_restart_aneg(phydev);
  461. } else
  462. err = genphy_setup_forced(phydev);
  463. return err;
  464. }
  465. EXPORT_SYMBOL(genphy_config_aneg);
  466. /**
  467. * genphy_update_link - update link status in @phydev
  468. * @phydev: target phy_device struct
  469. *
  470. * Description: Update the value in phydev->link to reflect the
  471. * current link value. In order to do this, we need to read
  472. * the status register twice, keeping the second value.
  473. */
  474. int genphy_update_link(struct phy_device *phydev)
  475. {
  476. int status;
  477. /* Do a fake read */
  478. status = phy_read(phydev, MII_BMSR);
  479. if (status < 0)
  480. return status;
  481. /* Read link and autonegotiation status */
  482. status = phy_read(phydev, MII_BMSR);
  483. if (status < 0)
  484. return status;
  485. if ((status & BMSR_LSTATUS) == 0)
  486. phydev->link = 0;
  487. else
  488. phydev->link = 1;
  489. return 0;
  490. }
  491. EXPORT_SYMBOL(genphy_update_link);
  492. /**
  493. * genphy_read_status - check the link status and update current link state
  494. * @phydev: target phy_device struct
  495. *
  496. * Description: Check the link, then figure out the current state
  497. * by comparing what we advertise with what the link partner
  498. * advertises. Start by checking the gigabit possibilities,
  499. * then move on to 10/100.
  500. */
  501. int genphy_read_status(struct phy_device *phydev)
  502. {
  503. int adv;
  504. int err;
  505. int lpa;
  506. int lpagb = 0;
  507. /* Update the link, but return if there
  508. * was an error */
  509. err = genphy_update_link(phydev);
  510. if (err)
  511. return err;
  512. if (AUTONEG_ENABLE == phydev->autoneg) {
  513. if (phydev->supported & (SUPPORTED_1000baseT_Half
  514. | SUPPORTED_1000baseT_Full)) {
  515. lpagb = phy_read(phydev, MII_STAT1000);
  516. if (lpagb < 0)
  517. return lpagb;
  518. adv = phy_read(phydev, MII_CTRL1000);
  519. if (adv < 0)
  520. return adv;
  521. lpagb &= adv << 2;
  522. }
  523. lpa = phy_read(phydev, MII_LPA);
  524. if (lpa < 0)
  525. return lpa;
  526. adv = phy_read(phydev, MII_ADVERTISE);
  527. if (adv < 0)
  528. return adv;
  529. lpa &= adv;
  530. phydev->speed = SPEED_10;
  531. phydev->duplex = DUPLEX_HALF;
  532. phydev->pause = phydev->asym_pause = 0;
  533. if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
  534. phydev->speed = SPEED_1000;
  535. if (lpagb & LPA_1000FULL)
  536. phydev->duplex = DUPLEX_FULL;
  537. } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
  538. phydev->speed = SPEED_100;
  539. if (lpa & LPA_100FULL)
  540. phydev->duplex = DUPLEX_FULL;
  541. } else
  542. if (lpa & LPA_10FULL)
  543. phydev->duplex = DUPLEX_FULL;
  544. if (phydev->duplex == DUPLEX_FULL){
  545. phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
  546. phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
  547. }
  548. } else {
  549. int bmcr = phy_read(phydev, MII_BMCR);
  550. if (bmcr < 0)
  551. return bmcr;
  552. if (bmcr & BMCR_FULLDPLX)
  553. phydev->duplex = DUPLEX_FULL;
  554. else
  555. phydev->duplex = DUPLEX_HALF;
  556. if (bmcr & BMCR_SPEED1000)
  557. phydev->speed = SPEED_1000;
  558. else if (bmcr & BMCR_SPEED100)
  559. phydev->speed = SPEED_100;
  560. else
  561. phydev->speed = SPEED_10;
  562. phydev->pause = phydev->asym_pause = 0;
  563. }
  564. return 0;
  565. }
  566. EXPORT_SYMBOL(genphy_read_status);
  567. static int genphy_config_init(struct phy_device *phydev)
  568. {
  569. int val;
  570. u32 features;
  571. /* For now, I'll claim that the generic driver supports
  572. * all possible port types */
  573. features = (SUPPORTED_TP | SUPPORTED_MII
  574. | SUPPORTED_AUI | SUPPORTED_FIBRE |
  575. SUPPORTED_BNC);
  576. /* Do we support autonegotiation? */
  577. val = phy_read(phydev, MII_BMSR);
  578. if (val < 0)
  579. return val;
  580. if (val & BMSR_ANEGCAPABLE)
  581. features |= SUPPORTED_Autoneg;
  582. if (val & BMSR_100FULL)
  583. features |= SUPPORTED_100baseT_Full;
  584. if (val & BMSR_100HALF)
  585. features |= SUPPORTED_100baseT_Half;
  586. if (val & BMSR_10FULL)
  587. features |= SUPPORTED_10baseT_Full;
  588. if (val & BMSR_10HALF)
  589. features |= SUPPORTED_10baseT_Half;
  590. if (val & BMSR_ESTATEN) {
  591. val = phy_read(phydev, MII_ESTATUS);
  592. if (val < 0)
  593. return val;
  594. if (val & ESTATUS_1000_TFULL)
  595. features |= SUPPORTED_1000baseT_Full;
  596. if (val & ESTATUS_1000_THALF)
  597. features |= SUPPORTED_1000baseT_Half;
  598. }
  599. phydev->supported = features;
  600. phydev->advertising = features;
  601. return 0;
  602. }
  603. /**
  604. * phy_probe - probe and init a PHY device
  605. * @dev: device to probe and init
  606. *
  607. * Description: Take care of setting up the phy_device structure,
  608. * set the state to READY (the driver's init function should
  609. * set it to STARTING if needed).
  610. */
  611. static int phy_probe(struct device *dev)
  612. {
  613. struct phy_device *phydev;
  614. struct phy_driver *phydrv;
  615. struct device_driver *drv;
  616. int err = 0;
  617. phydev = to_phy_device(dev);
  618. /* Make sure the driver is held.
  619. * XXX -- Is this correct? */
  620. drv = get_driver(phydev->dev.driver);
  621. phydrv = to_phy_driver(drv);
  622. phydev->drv = phydrv;
  623. /* Disable the interrupt if the PHY doesn't support it */
  624. if (!(phydrv->flags & PHY_HAS_INTERRUPT))
  625. phydev->irq = PHY_POLL;
  626. mutex_lock(&phydev->lock);
  627. /* Start out supporting everything. Eventually,
  628. * a controller will attach, and may modify one
  629. * or both of these values */
  630. phydev->supported = phydrv->features;
  631. phydev->advertising = phydrv->features;
  632. /* Set the state to READY by default */
  633. phydev->state = PHY_READY;
  634. if (phydev->drv->probe)
  635. err = phydev->drv->probe(phydev);
  636. mutex_unlock(&phydev->lock);
  637. return err;
  638. }
  639. static int phy_remove(struct device *dev)
  640. {
  641. struct phy_device *phydev;
  642. phydev = to_phy_device(dev);
  643. mutex_lock(&phydev->lock);
  644. phydev->state = PHY_DOWN;
  645. mutex_unlock(&phydev->lock);
  646. if (phydev->drv->remove)
  647. phydev->drv->remove(phydev);
  648. put_driver(dev->driver);
  649. phydev->drv = NULL;
  650. return 0;
  651. }
  652. /**
  653. * phy_driver_register - register a phy_driver with the PHY layer
  654. * @new_driver: new phy_driver to register
  655. */
  656. int phy_driver_register(struct phy_driver *new_driver)
  657. {
  658. int retval;
  659. memset(&new_driver->driver, 0, sizeof(new_driver->driver));
  660. new_driver->driver.name = new_driver->name;
  661. new_driver->driver.bus = &mdio_bus_type;
  662. new_driver->driver.probe = phy_probe;
  663. new_driver->driver.remove = phy_remove;
  664. retval = driver_register(&new_driver->driver);
  665. if (retval) {
  666. printk(KERN_ERR "%s: Error %d in registering driver\n",
  667. new_driver->name, retval);
  668. return retval;
  669. }
  670. pr_debug("%s: Registered new driver\n", new_driver->name);
  671. return 0;
  672. }
  673. EXPORT_SYMBOL(phy_driver_register);
  674. void phy_driver_unregister(struct phy_driver *drv)
  675. {
  676. driver_unregister(&drv->driver);
  677. }
  678. EXPORT_SYMBOL(phy_driver_unregister);
  679. static struct phy_driver genphy_driver = {
  680. .phy_id = 0xffffffff,
  681. .phy_id_mask = 0xffffffff,
  682. .name = "Generic PHY",
  683. .config_init = genphy_config_init,
  684. .features = 0,
  685. .config_aneg = genphy_config_aneg,
  686. .read_status = genphy_read_status,
  687. .driver = {.owner= THIS_MODULE, },
  688. };
  689. static int __init phy_init(void)
  690. {
  691. int rc;
  692. rc = mdio_bus_init();
  693. if (rc)
  694. return rc;
  695. rc = phy_driver_register(&genphy_driver);
  696. if (rc)
  697. mdio_bus_exit();
  698. return rc;
  699. }
  700. static void __exit phy_exit(void)
  701. {
  702. phy_driver_unregister(&genphy_driver);
  703. mdio_bus_exit();
  704. }
  705. subsys_initcall(phy_init);
  706. module_exit(phy_exit);