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00db8189 AF |
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 | */ | |
00db8189 | 17 | #include <linux/kernel.h> |
00db8189 AF |
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> | |
00db8189 AF |
28 | #include <linux/mm.h> |
29 | #include <linux/module.h> | |
00db8189 AF |
30 | #include <linux/mii.h> |
31 | #include <linux/ethtool.h> | |
32 | #include <linux/phy.h> | |
33 | ||
34 | #include <asm/io.h> | |
35 | #include <asm/irq.h> | |
36 | #include <asm/uaccess.h> | |
37 | ||
afcceaa3 OH |
38 | MODULE_DESCRIPTION("PHY library"); |
39 | MODULE_AUTHOR("Andy Fleming"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | ||
e1393456 AF |
42 | static struct phy_driver genphy_driver; |
43 | extern int mdio_bus_init(void); | |
44 | extern void mdio_bus_exit(void); | |
67c4f3fa | 45 | |
6f4a7f41 AV |
46 | void phy_device_free(struct phy_device *phydev) |
47 | { | |
48 | kfree(phydev); | |
49 | } | |
50 | ||
51 | static void phy_device_release(struct device *dev) | |
52 | { | |
53 | phy_device_free(to_phy_device(dev)); | |
54 | } | |
55 | ||
f62220d3 AF |
56 | static LIST_HEAD(phy_fixup_list); |
57 | static DEFINE_MUTEX(phy_fixup_lock); | |
58 | ||
59 | /* | |
60 | * Creates a new phy_fixup and adds it to the list | |
61 | * @bus_id: A string which matches phydev->dev.bus_id (or PHY_ANY_ID) | |
62 | * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY) | |
63 | * It can also be PHY_ANY_UID | |
64 | * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before | |
65 | * comparison | |
66 | * @run: The actual code to be run when a matching PHY is found | |
67 | */ | |
68 | int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask, | |
69 | int (*run)(struct phy_device *)) | |
70 | { | |
71 | struct phy_fixup *fixup; | |
72 | ||
73 | fixup = kzalloc(sizeof(struct phy_fixup), GFP_KERNEL); | |
74 | if (!fixup) | |
75 | return -ENOMEM; | |
76 | ||
fb28ad35 | 77 | strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id)); |
f62220d3 AF |
78 | fixup->phy_uid = phy_uid; |
79 | fixup->phy_uid_mask = phy_uid_mask; | |
80 | fixup->run = run; | |
81 | ||
82 | mutex_lock(&phy_fixup_lock); | |
83 | list_add_tail(&fixup->list, &phy_fixup_list); | |
84 | mutex_unlock(&phy_fixup_lock); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | EXPORT_SYMBOL(phy_register_fixup); | |
89 | ||
90 | /* Registers a fixup to be run on any PHY with the UID in phy_uid */ | |
91 | int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask, | |
92 | int (*run)(struct phy_device *)) | |
93 | { | |
94 | return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run); | |
95 | } | |
96 | EXPORT_SYMBOL(phy_register_fixup_for_uid); | |
97 | ||
98 | /* Registers a fixup to be run on the PHY with id string bus_id */ | |
99 | int phy_register_fixup_for_id(const char *bus_id, | |
100 | int (*run)(struct phy_device *)) | |
101 | { | |
102 | return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run); | |
103 | } | |
104 | EXPORT_SYMBOL(phy_register_fixup_for_id); | |
105 | ||
106 | /* | |
107 | * Returns 1 if fixup matches phydev in bus_id and phy_uid. | |
108 | * Fixups can be set to match any in one or more fields. | |
109 | */ | |
110 | static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup) | |
111 | { | |
fb28ad35 | 112 | if (strcmp(fixup->bus_id, dev_name(&phydev->dev)) != 0) |
f62220d3 AF |
113 | if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0) |
114 | return 0; | |
115 | ||
116 | if ((fixup->phy_uid & fixup->phy_uid_mask) != | |
117 | (phydev->phy_id & fixup->phy_uid_mask)) | |
118 | if (fixup->phy_uid != PHY_ANY_UID) | |
119 | return 0; | |
120 | ||
121 | return 1; | |
122 | } | |
123 | ||
124 | /* Runs any matching fixups for this phydev */ | |
125 | int phy_scan_fixups(struct phy_device *phydev) | |
126 | { | |
127 | struct phy_fixup *fixup; | |
128 | ||
129 | mutex_lock(&phy_fixup_lock); | |
130 | list_for_each_entry(fixup, &phy_fixup_list, list) { | |
131 | if (phy_needs_fixup(phydev, fixup)) { | |
132 | int err; | |
133 | ||
134 | err = fixup->run(phydev); | |
135 | ||
136 | if (err < 0) | |
137 | return err; | |
138 | } | |
139 | } | |
140 | mutex_unlock(&phy_fixup_lock); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | EXPORT_SYMBOL(phy_scan_fixups); | |
145 | ||
11b0bacd VB |
146 | struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id) |
147 | { | |
148 | struct phy_device *dev; | |
149 | /* We allocate the device, and initialize the | |
150 | * default values */ | |
cd861280 | 151 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
11b0bacd VB |
152 | |
153 | if (NULL == dev) | |
154 | return (struct phy_device*) PTR_ERR((void*)-ENOMEM); | |
155 | ||
6f4a7f41 AV |
156 | dev->dev.release = phy_device_release; |
157 | ||
11b0bacd VB |
158 | dev->speed = 0; |
159 | dev->duplex = -1; | |
160 | dev->pause = dev->asym_pause = 0; | |
161 | dev->link = 1; | |
e8a2b6a4 | 162 | dev->interface = PHY_INTERFACE_MODE_GMII; |
11b0bacd VB |
163 | |
164 | dev->autoneg = AUTONEG_ENABLE; | |
165 | ||
166 | dev->addr = addr; | |
167 | dev->phy_id = phy_id; | |
168 | dev->bus = bus; | |
169 | ||
170 | dev->state = PHY_DOWN; | |
171 | ||
35b5f6b1 | 172 | mutex_init(&dev->lock); |
11b0bacd VB |
173 | |
174 | return dev; | |
175 | } | |
176 | EXPORT_SYMBOL(phy_device_create); | |
177 | ||
b3df0da8 | 178 | /** |
cac1f3c8 | 179 | * get_phy_id - reads the specified addr for its ID. |
b3df0da8 RD |
180 | * @bus: the target MII bus |
181 | * @addr: PHY address on the MII bus | |
cac1f3c8 | 182 | * @phy_id: where to store the ID retrieved. |
00db8189 | 183 | * |
b3df0da8 | 184 | * Description: Reads the ID registers of the PHY at @addr on the |
cac1f3c8 | 185 | * @bus, stores it in @phy_id and returns zero on success. |
00db8189 | 186 | */ |
cac1f3c8 | 187 | int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id) |
00db8189 AF |
188 | { |
189 | int phy_reg; | |
00db8189 AF |
190 | |
191 | /* Grab the bits from PHYIR1, and put them | |
192 | * in the upper half */ | |
193 | phy_reg = bus->read(bus, addr, MII_PHYSID1); | |
194 | ||
195 | if (phy_reg < 0) | |
cac1f3c8 | 196 | return -EIO; |
00db8189 | 197 | |
cac1f3c8 | 198 | *phy_id = (phy_reg & 0xffff) << 16; |
00db8189 AF |
199 | |
200 | /* Grab the bits from PHYIR2, and put them in the lower half */ | |
201 | phy_reg = bus->read(bus, addr, MII_PHYSID2); | |
202 | ||
203 | if (phy_reg < 0) | |
cac1f3c8 PG |
204 | return -EIO; |
205 | ||
206 | *phy_id |= (phy_reg & 0xffff); | |
207 | ||
208 | return 0; | |
209 | } | |
a01b3d76 | 210 | EXPORT_SYMBOL(get_phy_id); |
cac1f3c8 PG |
211 | |
212 | /** | |
213 | * get_phy_device - reads the specified PHY device and returns its @phy_device struct | |
214 | * @bus: the target MII bus | |
215 | * @addr: PHY address on the MII bus | |
216 | * | |
217 | * Description: Reads the ID registers of the PHY at @addr on the | |
218 | * @bus, then allocates and returns the phy_device to represent it. | |
219 | */ | |
220 | struct phy_device * get_phy_device(struct mii_bus *bus, int addr) | |
221 | { | |
222 | struct phy_device *dev = NULL; | |
223 | u32 phy_id; | |
224 | int r; | |
00db8189 | 225 | |
cac1f3c8 PG |
226 | r = get_phy_id(bus, addr, &phy_id); |
227 | if (r) | |
228 | return ERR_PTR(r); | |
00db8189 | 229 | |
6436cbcd GC |
230 | /* If the phy_id is mostly Fs, there is no device there */ |
231 | if ((phy_id & 0x1fffffff) == 0x1fffffff) | |
232 | return NULL; | |
233 | ||
234 | /* | |
235 | * Broken hardware is sometimes missing the pull down resistor on the | |
236 | * MDIO line, which results in reads to non-existent devices returning | |
237 | * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent | |
238 | * device as well. | |
239 | */ | |
240 | if (phy_id == 0) | |
00db8189 AF |
241 | return NULL; |
242 | ||
11b0bacd | 243 | dev = phy_device_create(bus, addr, phy_id); |
00db8189 AF |
244 | |
245 | return dev; | |
246 | } | |
247 | ||
b3df0da8 RD |
248 | /** |
249 | * phy_prepare_link - prepares the PHY layer to monitor link status | |
250 | * @phydev: target phy_device struct | |
251 | * @handler: callback function for link status change notifications | |
00db8189 | 252 | * |
b3df0da8 | 253 | * Description: Tells the PHY infrastructure to handle the |
00db8189 AF |
254 | * gory details on monitoring link status (whether through |
255 | * polling or an interrupt), and to call back to the | |
256 | * connected device driver when the link status changes. | |
257 | * If you want to monitor your own link state, don't call | |
b3df0da8 RD |
258 | * this function. |
259 | */ | |
00db8189 AF |
260 | void phy_prepare_link(struct phy_device *phydev, |
261 | void (*handler)(struct net_device *)) | |
262 | { | |
263 | phydev->adjust_link = handler; | |
264 | } | |
265 | ||
b3df0da8 RD |
266 | /** |
267 | * phy_connect - connect an ethernet device to a PHY device | |
268 | * @dev: the network device to connect | |
5d12b132 | 269 | * @bus_id: the id string of the PHY device to connect |
b3df0da8 RD |
270 | * @handler: callback function for state change notifications |
271 | * @flags: PHY device's dev_flags | |
272 | * @interface: PHY device's interface | |
e1393456 | 273 | * |
b3df0da8 | 274 | * Description: Convenience function for connecting ethernet |
e1393456 AF |
275 | * devices to PHY devices. The default behavior is for |
276 | * the PHY infrastructure to handle everything, and only notify | |
277 | * the connected driver when the link status changes. If you | |
278 | * don't want, or can't use the provided functionality, you may | |
279 | * choose to call only the subset of functions which provide | |
280 | * the desired functionality. | |
281 | */ | |
f62220d3 | 282 | struct phy_device * phy_connect(struct net_device *dev, const char *bus_id, |
e8a2b6a4 | 283 | void (*handler)(struct net_device *), u32 flags, |
1a168934 | 284 | phy_interface_t interface) |
e1393456 AF |
285 | { |
286 | struct phy_device *phydev; | |
287 | ||
f62220d3 | 288 | phydev = phy_attach(dev, bus_id, flags, interface); |
e1393456 AF |
289 | |
290 | if (IS_ERR(phydev)) | |
291 | return phydev; | |
292 | ||
293 | phy_prepare_link(phydev, handler); | |
294 | ||
295 | phy_start_machine(phydev, NULL); | |
296 | ||
297 | if (phydev->irq > 0) | |
298 | phy_start_interrupts(phydev); | |
299 | ||
300 | return phydev; | |
301 | } | |
302 | EXPORT_SYMBOL(phy_connect); | |
303 | ||
b3df0da8 RD |
304 | /** |
305 | * phy_disconnect - disable interrupts, stop state machine, and detach a PHY device | |
306 | * @phydev: target phy_device struct | |
307 | */ | |
e1393456 AF |
308 | void phy_disconnect(struct phy_device *phydev) |
309 | { | |
310 | if (phydev->irq > 0) | |
311 | phy_stop_interrupts(phydev); | |
312 | ||
313 | phy_stop_machine(phydev); | |
314 | ||
315 | phydev->adjust_link = NULL; | |
316 | ||
317 | phy_detach(phydev); | |
318 | } | |
319 | EXPORT_SYMBOL(phy_disconnect); | |
320 | ||
b3df0da8 RD |
321 | /** |
322 | * phy_attach - attach a network device to a particular PHY device | |
323 | * @dev: network device to attach | |
f62220d3 | 324 | * @bus_id: PHY device to attach |
b3df0da8 RD |
325 | * @flags: PHY device's dev_flags |
326 | * @interface: PHY device's interface | |
e1393456 | 327 | * |
b3df0da8 | 328 | * Description: Called by drivers to attach to a particular PHY |
e1393456 AF |
329 | * device. The phy_device is found, and properly hooked up |
330 | * to the phy_driver. If no driver is attached, then the | |
331 | * genphy_driver is used. The phy_device is given a ptr to | |
332 | * the attaching device, and given a callback for link status | |
b3df0da8 | 333 | * change. The phy_device is returned to the attaching driver. |
e1393456 | 334 | */ |
e1393456 | 335 | struct phy_device *phy_attach(struct net_device *dev, |
f62220d3 | 336 | const char *bus_id, u32 flags, phy_interface_t interface) |
e1393456 AF |
337 | { |
338 | struct bus_type *bus = &mdio_bus_type; | |
339 | struct phy_device *phydev; | |
340 | struct device *d; | |
341 | ||
342 | /* Search the list of PHY devices on the mdio bus for the | |
343 | * PHY with the requested name */ | |
26853ab6 | 344 | d = bus_find_device_by_name(bus, NULL, bus_id); |
e1393456 AF |
345 | if (d) { |
346 | phydev = to_phy_device(d); | |
347 | } else { | |
f62220d3 | 348 | printk(KERN_ERR "%s not found\n", bus_id); |
e1393456 AF |
349 | return ERR_PTR(-ENODEV); |
350 | } | |
351 | ||
352 | /* Assume that if there is no driver, that it doesn't | |
353 | * exist, and we should use the genphy driver. */ | |
354 | if (NULL == d->driver) { | |
355 | int err; | |
e1393456 AF |
356 | d->driver = &genphy_driver.driver; |
357 | ||
358 | err = d->driver->probe(d); | |
b7a00ecd JG |
359 | if (err >= 0) |
360 | err = device_bind_driver(d); | |
e1393456 | 361 | |
b7a00ecd JG |
362 | if (err) |
363 | return ERR_PTR(err); | |
e1393456 AF |
364 | } |
365 | ||
366 | if (phydev->attached_dev) { | |
367 | printk(KERN_ERR "%s: %s already attached\n", | |
f62220d3 | 368 | dev->name, bus_id); |
e1393456 AF |
369 | return ERR_PTR(-EBUSY); |
370 | } | |
371 | ||
372 | phydev->attached_dev = dev; | |
373 | ||
374 | phydev->dev_flags = flags; | |
375 | ||
e8a2b6a4 AF |
376 | phydev->interface = interface; |
377 | ||
378 | /* Do initial configuration here, now that | |
379 | * we have certain key parameters | |
380 | * (dev_flags and interface) */ | |
381 | if (phydev->drv->config_init) { | |
382 | int err; | |
383 | ||
f62220d3 AF |
384 | err = phy_scan_fixups(phydev); |
385 | ||
386 | if (err < 0) | |
387 | return ERR_PTR(err); | |
388 | ||
e8a2b6a4 AF |
389 | err = phydev->drv->config_init(phydev); |
390 | ||
391 | if (err < 0) | |
392 | return ERR_PTR(err); | |
393 | } | |
394 | ||
e1393456 AF |
395 | return phydev; |
396 | } | |
397 | EXPORT_SYMBOL(phy_attach); | |
398 | ||
b3df0da8 RD |
399 | /** |
400 | * phy_detach - detach a PHY device from its network device | |
401 | * @phydev: target phy_device struct | |
402 | */ | |
e1393456 AF |
403 | void phy_detach(struct phy_device *phydev) |
404 | { | |
405 | phydev->attached_dev = NULL; | |
406 | ||
407 | /* If the device had no specific driver before (i.e. - it | |
408 | * was using the generic driver), we unbind the device | |
409 | * from the generic driver so that there's a chance a | |
410 | * real driver could be loaded */ | |
87aebe07 | 411 | if (phydev->dev.driver == &genphy_driver.driver) |
e1393456 | 412 | device_release_driver(&phydev->dev); |
e1393456 AF |
413 | } |
414 | EXPORT_SYMBOL(phy_detach); | |
415 | ||
416 | ||
00db8189 AF |
417 | /* Generic PHY support and helper functions */ |
418 | ||
b3df0da8 RD |
419 | /** |
420 | * genphy_config_advert - sanitize and advertise auto-negotation parameters | |
421 | * @phydev: target phy_device struct | |
00db8189 | 422 | * |
b3df0da8 | 423 | * Description: Writes MII_ADVERTISE with the appropriate values, |
00db8189 | 424 | * after sanitizing the values to make sure we only advertise |
51e2a384 TP |
425 | * what is supported. Returns < 0 on error, 0 if the PHY's advertisement |
426 | * hasn't changed, and > 0 if it has changed. | |
00db8189 | 427 | */ |
e1393456 | 428 | int genphy_config_advert(struct phy_device *phydev) |
00db8189 AF |
429 | { |
430 | u32 advertise; | |
51e2a384 TP |
431 | int oldadv, adv; |
432 | int err, changed = 0; | |
00db8189 AF |
433 | |
434 | /* Only allow advertising what | |
435 | * this PHY supports */ | |
436 | phydev->advertising &= phydev->supported; | |
437 | advertise = phydev->advertising; | |
438 | ||
439 | /* Setup standard advertisement */ | |
51e2a384 | 440 | oldadv = adv = phy_read(phydev, MII_ADVERTISE); |
00db8189 AF |
441 | |
442 | if (adv < 0) | |
443 | return adv; | |
444 | ||
445 | adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP | | |
446 | ADVERTISE_PAUSE_ASYM); | |
447 | if (advertise & ADVERTISED_10baseT_Half) | |
448 | adv |= ADVERTISE_10HALF; | |
449 | if (advertise & ADVERTISED_10baseT_Full) | |
450 | adv |= ADVERTISE_10FULL; | |
451 | if (advertise & ADVERTISED_100baseT_Half) | |
452 | adv |= ADVERTISE_100HALF; | |
453 | if (advertise & ADVERTISED_100baseT_Full) | |
454 | adv |= ADVERTISE_100FULL; | |
455 | if (advertise & ADVERTISED_Pause) | |
456 | adv |= ADVERTISE_PAUSE_CAP; | |
457 | if (advertise & ADVERTISED_Asym_Pause) | |
458 | adv |= ADVERTISE_PAUSE_ASYM; | |
459 | ||
51e2a384 TP |
460 | if (adv != oldadv) { |
461 | err = phy_write(phydev, MII_ADVERTISE, adv); | |
00db8189 | 462 | |
51e2a384 TP |
463 | if (err < 0) |
464 | return err; | |
465 | changed = 1; | |
466 | } | |
00db8189 AF |
467 | |
468 | /* Configure gigabit if it's supported */ | |
469 | if (phydev->supported & (SUPPORTED_1000baseT_Half | | |
470 | SUPPORTED_1000baseT_Full)) { | |
51e2a384 | 471 | oldadv = adv = phy_read(phydev, MII_CTRL1000); |
00db8189 AF |
472 | |
473 | if (adv < 0) | |
474 | return adv; | |
475 | ||
476 | adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF); | |
477 | if (advertise & SUPPORTED_1000baseT_Half) | |
478 | adv |= ADVERTISE_1000HALF; | |
479 | if (advertise & SUPPORTED_1000baseT_Full) | |
480 | adv |= ADVERTISE_1000FULL; | |
00db8189 | 481 | |
51e2a384 TP |
482 | if (adv != oldadv) { |
483 | err = phy_write(phydev, MII_CTRL1000, adv); | |
484 | ||
485 | if (err < 0) | |
486 | return err; | |
487 | changed = 1; | |
488 | } | |
00db8189 AF |
489 | } |
490 | ||
51e2a384 | 491 | return changed; |
00db8189 | 492 | } |
e1393456 | 493 | EXPORT_SYMBOL(genphy_config_advert); |
00db8189 | 494 | |
b3df0da8 RD |
495 | /** |
496 | * genphy_setup_forced - configures/forces speed/duplex from @phydev | |
497 | * @phydev: target phy_device struct | |
00db8189 | 498 | * |
b3df0da8 | 499 | * Description: Configures MII_BMCR to force speed/duplex |
00db8189 | 500 | * to the values in phydev. Assumes that the values are valid. |
b3df0da8 RD |
501 | * Please see phy_sanitize_settings(). |
502 | */ | |
00db8189 AF |
503 | int genphy_setup_forced(struct phy_device *phydev) |
504 | { | |
f62220d3 | 505 | int err; |
bc1e0a09 | 506 | int ctl = 0; |
00db8189 AF |
507 | |
508 | phydev->pause = phydev->asym_pause = 0; | |
509 | ||
510 | if (SPEED_1000 == phydev->speed) | |
511 | ctl |= BMCR_SPEED1000; | |
512 | else if (SPEED_100 == phydev->speed) | |
513 | ctl |= BMCR_SPEED100; | |
514 | ||
515 | if (DUPLEX_FULL == phydev->duplex) | |
516 | ctl |= BMCR_FULLDPLX; | |
517 | ||
f62220d3 | 518 | err = phy_write(phydev, MII_BMCR, ctl); |
00db8189 | 519 | |
f62220d3 AF |
520 | if (err < 0) |
521 | return err; | |
522 | ||
523 | /* | |
524 | * Run the fixups on this PHY, just in case the | |
525 | * board code needs to change something after a reset | |
526 | */ | |
527 | err = phy_scan_fixups(phydev); | |
528 | ||
529 | if (err < 0) | |
530 | return err; | |
00db8189 AF |
531 | |
532 | /* We just reset the device, so we'd better configure any | |
533 | * settings the PHY requires to operate */ | |
534 | if (phydev->drv->config_init) | |
f62220d3 | 535 | err = phydev->drv->config_init(phydev); |
00db8189 | 536 | |
f62220d3 | 537 | return err; |
00db8189 AF |
538 | } |
539 | ||
540 | ||
b3df0da8 RD |
541 | /** |
542 | * genphy_restart_aneg - Enable and Restart Autonegotiation | |
543 | * @phydev: target phy_device struct | |
544 | */ | |
00db8189 AF |
545 | int genphy_restart_aneg(struct phy_device *phydev) |
546 | { | |
547 | int ctl; | |
548 | ||
549 | ctl = phy_read(phydev, MII_BMCR); | |
550 | ||
551 | if (ctl < 0) | |
552 | return ctl; | |
553 | ||
554 | ctl |= (BMCR_ANENABLE | BMCR_ANRESTART); | |
555 | ||
556 | /* Don't isolate the PHY if we're negotiating */ | |
557 | ctl &= ~(BMCR_ISOLATE); | |
558 | ||
559 | ctl = phy_write(phydev, MII_BMCR, ctl); | |
560 | ||
561 | return ctl; | |
562 | } | |
892871dc | 563 | EXPORT_SYMBOL(genphy_restart_aneg); |
00db8189 AF |
564 | |
565 | ||
b3df0da8 RD |
566 | /** |
567 | * genphy_config_aneg - restart auto-negotiation or write BMCR | |
568 | * @phydev: target phy_device struct | |
00db8189 | 569 | * |
b3df0da8 | 570 | * Description: If auto-negotiation is enabled, we configure the |
00db8189 | 571 | * advertising, and then restart auto-negotiation. If it is not |
b3df0da8 | 572 | * enabled, then we write the BMCR. |
00db8189 AF |
573 | */ |
574 | int genphy_config_aneg(struct phy_device *phydev) | |
575 | { | |
de339c2a | 576 | int result; |
00db8189 | 577 | |
de339c2a TP |
578 | if (AUTONEG_ENABLE != phydev->autoneg) |
579 | return genphy_setup_forced(phydev); | |
00db8189 | 580 | |
de339c2a | 581 | result = genphy_config_advert(phydev); |
00db8189 | 582 | |
de339c2a TP |
583 | if (result < 0) /* error */ |
584 | return result; | |
585 | ||
586 | if (result == 0) { | |
587 | /* Advertisment hasn't changed, but maybe aneg was never on to | |
588 | * begin with? Or maybe phy was isolated? */ | |
589 | int ctl = phy_read(phydev, MII_BMCR); | |
590 | ||
591 | if (ctl < 0) | |
592 | return ctl; | |
593 | ||
594 | if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE)) | |
595 | result = 1; /* do restart aneg */ | |
596 | } | |
597 | ||
598 | /* Only restart aneg if we are advertising something different | |
599 | * than we were before. */ | |
600 | if (result > 0) | |
601 | result = genphy_restart_aneg(phydev); | |
00db8189 | 602 | |
51e2a384 | 603 | return result; |
00db8189 AF |
604 | } |
605 | EXPORT_SYMBOL(genphy_config_aneg); | |
606 | ||
b3df0da8 RD |
607 | /** |
608 | * genphy_update_link - update link status in @phydev | |
609 | * @phydev: target phy_device struct | |
00db8189 | 610 | * |
b3df0da8 | 611 | * Description: Update the value in phydev->link to reflect the |
00db8189 | 612 | * current link value. In order to do this, we need to read |
b3df0da8 | 613 | * the status register twice, keeping the second value. |
00db8189 AF |
614 | */ |
615 | int genphy_update_link(struct phy_device *phydev) | |
616 | { | |
617 | int status; | |
618 | ||
619 | /* Do a fake read */ | |
620 | status = phy_read(phydev, MII_BMSR); | |
621 | ||
622 | if (status < 0) | |
623 | return status; | |
624 | ||
625 | /* Read link and autonegotiation status */ | |
626 | status = phy_read(phydev, MII_BMSR); | |
627 | ||
628 | if (status < 0) | |
629 | return status; | |
630 | ||
631 | if ((status & BMSR_LSTATUS) == 0) | |
632 | phydev->link = 0; | |
633 | else | |
634 | phydev->link = 1; | |
635 | ||
636 | return 0; | |
637 | } | |
6b655529 | 638 | EXPORT_SYMBOL(genphy_update_link); |
00db8189 | 639 | |
b3df0da8 RD |
640 | /** |
641 | * genphy_read_status - check the link status and update current link state | |
642 | * @phydev: target phy_device struct | |
00db8189 | 643 | * |
b3df0da8 | 644 | * Description: Check the link, then figure out the current state |
00db8189 AF |
645 | * by comparing what we advertise with what the link partner |
646 | * advertises. Start by checking the gigabit possibilities, | |
647 | * then move on to 10/100. | |
648 | */ | |
649 | int genphy_read_status(struct phy_device *phydev) | |
650 | { | |
651 | int adv; | |
652 | int err; | |
653 | int lpa; | |
654 | int lpagb = 0; | |
655 | ||
656 | /* Update the link, but return if there | |
657 | * was an error */ | |
658 | err = genphy_update_link(phydev); | |
659 | if (err) | |
660 | return err; | |
661 | ||
662 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
663 | if (phydev->supported & (SUPPORTED_1000baseT_Half | |
664 | | SUPPORTED_1000baseT_Full)) { | |
665 | lpagb = phy_read(phydev, MII_STAT1000); | |
666 | ||
667 | if (lpagb < 0) | |
668 | return lpagb; | |
669 | ||
670 | adv = phy_read(phydev, MII_CTRL1000); | |
671 | ||
672 | if (adv < 0) | |
673 | return adv; | |
674 | ||
675 | lpagb &= adv << 2; | |
676 | } | |
677 | ||
678 | lpa = phy_read(phydev, MII_LPA); | |
679 | ||
680 | if (lpa < 0) | |
681 | return lpa; | |
682 | ||
683 | adv = phy_read(phydev, MII_ADVERTISE); | |
684 | ||
685 | if (adv < 0) | |
686 | return adv; | |
687 | ||
688 | lpa &= adv; | |
689 | ||
690 | phydev->speed = SPEED_10; | |
691 | phydev->duplex = DUPLEX_HALF; | |
692 | phydev->pause = phydev->asym_pause = 0; | |
693 | ||
694 | if (lpagb & (LPA_1000FULL | LPA_1000HALF)) { | |
695 | phydev->speed = SPEED_1000; | |
696 | ||
697 | if (lpagb & LPA_1000FULL) | |
698 | phydev->duplex = DUPLEX_FULL; | |
699 | } else if (lpa & (LPA_100FULL | LPA_100HALF)) { | |
700 | phydev->speed = SPEED_100; | |
701 | ||
702 | if (lpa & LPA_100FULL) | |
703 | phydev->duplex = DUPLEX_FULL; | |
704 | } else | |
705 | if (lpa & LPA_10FULL) | |
706 | phydev->duplex = DUPLEX_FULL; | |
707 | ||
708 | if (phydev->duplex == DUPLEX_FULL){ | |
709 | phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0; | |
710 | phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0; | |
711 | } | |
712 | } else { | |
713 | int bmcr = phy_read(phydev, MII_BMCR); | |
714 | if (bmcr < 0) | |
715 | return bmcr; | |
716 | ||
717 | if (bmcr & BMCR_FULLDPLX) | |
718 | phydev->duplex = DUPLEX_FULL; | |
719 | else | |
720 | phydev->duplex = DUPLEX_HALF; | |
721 | ||
722 | if (bmcr & BMCR_SPEED1000) | |
723 | phydev->speed = SPEED_1000; | |
724 | else if (bmcr & BMCR_SPEED100) | |
725 | phydev->speed = SPEED_100; | |
726 | else | |
727 | phydev->speed = SPEED_10; | |
728 | ||
729 | phydev->pause = phydev->asym_pause = 0; | |
730 | } | |
731 | ||
732 | return 0; | |
733 | } | |
734 | EXPORT_SYMBOL(genphy_read_status); | |
735 | ||
736 | static int genphy_config_init(struct phy_device *phydev) | |
737 | { | |
84c22d79 | 738 | int val; |
00db8189 AF |
739 | u32 features; |
740 | ||
741 | /* For now, I'll claim that the generic driver supports | |
742 | * all possible port types */ | |
743 | features = (SUPPORTED_TP | SUPPORTED_MII | |
744 | | SUPPORTED_AUI | SUPPORTED_FIBRE | | |
745 | SUPPORTED_BNC); | |
746 | ||
747 | /* Do we support autonegotiation? */ | |
748 | val = phy_read(phydev, MII_BMSR); | |
749 | ||
750 | if (val < 0) | |
751 | return val; | |
752 | ||
753 | if (val & BMSR_ANEGCAPABLE) | |
754 | features |= SUPPORTED_Autoneg; | |
755 | ||
756 | if (val & BMSR_100FULL) | |
757 | features |= SUPPORTED_100baseT_Full; | |
758 | if (val & BMSR_100HALF) | |
759 | features |= SUPPORTED_100baseT_Half; | |
760 | if (val & BMSR_10FULL) | |
761 | features |= SUPPORTED_10baseT_Full; | |
762 | if (val & BMSR_10HALF) | |
763 | features |= SUPPORTED_10baseT_Half; | |
764 | ||
765 | if (val & BMSR_ESTATEN) { | |
766 | val = phy_read(phydev, MII_ESTATUS); | |
767 | ||
768 | if (val < 0) | |
769 | return val; | |
770 | ||
771 | if (val & ESTATUS_1000_TFULL) | |
772 | features |= SUPPORTED_1000baseT_Full; | |
773 | if (val & ESTATUS_1000_THALF) | |
774 | features |= SUPPORTED_1000baseT_Half; | |
775 | } | |
776 | ||
777 | phydev->supported = features; | |
778 | phydev->advertising = features; | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
783 | ||
b3df0da8 RD |
784 | /** |
785 | * phy_probe - probe and init a PHY device | |
786 | * @dev: device to probe and init | |
00db8189 | 787 | * |
b3df0da8 | 788 | * Description: Take care of setting up the phy_device structure, |
00db8189 AF |
789 | * set the state to READY (the driver's init function should |
790 | * set it to STARTING if needed). | |
791 | */ | |
792 | static int phy_probe(struct device *dev) | |
793 | { | |
794 | struct phy_device *phydev; | |
795 | struct phy_driver *phydrv; | |
796 | struct device_driver *drv; | |
797 | int err = 0; | |
798 | ||
799 | phydev = to_phy_device(dev); | |
800 | ||
801 | /* Make sure the driver is held. | |
802 | * XXX -- Is this correct? */ | |
803 | drv = get_driver(phydev->dev.driver); | |
804 | phydrv = to_phy_driver(drv); | |
805 | phydev->drv = phydrv; | |
806 | ||
807 | /* Disable the interrupt if the PHY doesn't support it */ | |
808 | if (!(phydrv->flags & PHY_HAS_INTERRUPT)) | |
809 | phydev->irq = PHY_POLL; | |
810 | ||
35b5f6b1 | 811 | mutex_lock(&phydev->lock); |
00db8189 AF |
812 | |
813 | /* Start out supporting everything. Eventually, | |
814 | * a controller will attach, and may modify one | |
815 | * or both of these values */ | |
816 | phydev->supported = phydrv->features; | |
817 | phydev->advertising = phydrv->features; | |
818 | ||
819 | /* Set the state to READY by default */ | |
820 | phydev->state = PHY_READY; | |
821 | ||
822 | if (phydev->drv->probe) | |
823 | err = phydev->drv->probe(phydev); | |
824 | ||
35b5f6b1 | 825 | mutex_unlock(&phydev->lock); |
00db8189 | 826 | |
00db8189 | 827 | return err; |
e8a2b6a4 | 828 | |
00db8189 AF |
829 | } |
830 | ||
831 | static int phy_remove(struct device *dev) | |
832 | { | |
833 | struct phy_device *phydev; | |
834 | ||
835 | phydev = to_phy_device(dev); | |
836 | ||
35b5f6b1 | 837 | mutex_lock(&phydev->lock); |
00db8189 | 838 | phydev->state = PHY_DOWN; |
35b5f6b1 | 839 | mutex_unlock(&phydev->lock); |
00db8189 AF |
840 | |
841 | if (phydev->drv->remove) | |
842 | phydev->drv->remove(phydev); | |
843 | ||
844 | put_driver(dev->driver); | |
845 | phydev->drv = NULL; | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
b3df0da8 RD |
850 | /** |
851 | * phy_driver_register - register a phy_driver with the PHY layer | |
852 | * @new_driver: new phy_driver to register | |
853 | */ | |
00db8189 AF |
854 | int phy_driver_register(struct phy_driver *new_driver) |
855 | { | |
856 | int retval; | |
857 | ||
858 | memset(&new_driver->driver, 0, sizeof(new_driver->driver)); | |
859 | new_driver->driver.name = new_driver->name; | |
860 | new_driver->driver.bus = &mdio_bus_type; | |
861 | new_driver->driver.probe = phy_probe; | |
862 | new_driver->driver.remove = phy_remove; | |
863 | ||
864 | retval = driver_register(&new_driver->driver); | |
865 | ||
866 | if (retval) { | |
867 | printk(KERN_ERR "%s: Error %d in registering driver\n", | |
868 | new_driver->name, retval); | |
869 | ||
870 | return retval; | |
871 | } | |
872 | ||
f2511f13 | 873 | pr_debug("%s: Registered new driver\n", new_driver->name); |
00db8189 AF |
874 | |
875 | return 0; | |
876 | } | |
877 | EXPORT_SYMBOL(phy_driver_register); | |
878 | ||
879 | void phy_driver_unregister(struct phy_driver *drv) | |
880 | { | |
881 | driver_unregister(&drv->driver); | |
882 | } | |
883 | EXPORT_SYMBOL(phy_driver_unregister); | |
884 | ||
e1393456 AF |
885 | static struct phy_driver genphy_driver = { |
886 | .phy_id = 0xffffffff, | |
887 | .phy_id_mask = 0xffffffff, | |
888 | .name = "Generic PHY", | |
889 | .config_init = genphy_config_init, | |
890 | .features = 0, | |
891 | .config_aneg = genphy_config_aneg, | |
892 | .read_status = genphy_read_status, | |
893 | .driver = {.owner= THIS_MODULE, }, | |
894 | }; | |
00db8189 | 895 | |
67c4f3fa | 896 | static int __init phy_init(void) |
00db8189 | 897 | { |
67c4f3fa | 898 | int rc; |
67c4f3fa JG |
899 | |
900 | rc = mdio_bus_init(); | |
901 | if (rc) | |
e1393456 | 902 | return rc; |
00db8189 | 903 | |
e1393456 AF |
904 | rc = phy_driver_register(&genphy_driver); |
905 | if (rc) | |
906 | mdio_bus_exit(); | |
67c4f3fa | 907 | |
67c4f3fa | 908 | return rc; |
00db8189 AF |
909 | } |
910 | ||
67c4f3fa | 911 | static void __exit phy_exit(void) |
00db8189 AF |
912 | { |
913 | phy_driver_unregister(&genphy_driver); | |
e1393456 | 914 | mdio_bus_exit(); |
00db8189 AF |
915 | } |
916 | ||
e1393456 | 917 | subsys_initcall(phy_init); |
67c4f3fa | 918 | module_exit(phy_exit); |