Commit | Line | Data |
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00db8189 AF |
1 | /* |
2 | * drivers/net/phy/phy.c | |
3 | * | |
4 | * Framework for configuring and reading PHY devices | |
5 | * Based on code in sungem_phy.c and gianfar_phy.c | |
6 | * | |
7 | * Author: Andy Fleming | |
8 | * | |
9 | * Copyright (c) 2004 Freescale Semiconductor, Inc. | |
3c3070d7 | 10 | * Copyright (c) 2006 Maciej W. Rozycki |
00db8189 AF |
11 | * |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | */ | |
00db8189 AF |
18 | #include <linux/kernel.h> |
19 | #include <linux/sched.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/etherdevice.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/module.h> | |
00db8189 AF |
33 | #include <linux/mii.h> |
34 | #include <linux/ethtool.h> | |
35 | #include <linux/phy.h> | |
3c3070d7 MR |
36 | #include <linux/timer.h> |
37 | #include <linux/workqueue.h> | |
00db8189 AF |
38 | |
39 | #include <asm/io.h> | |
40 | #include <asm/irq.h> | |
41 | #include <asm/uaccess.h> | |
42 | ||
e1393456 AF |
43 | /* Convenience function to print out the current phy status |
44 | */ | |
45 | void phy_print_status(struct phy_device *phydev) | |
46 | { | |
a4d00f17 | 47 | pr_info("PHY: %s - Link is %s", phydev->dev.bus_id, |
e1393456 AF |
48 | phydev->link ? "Up" : "Down"); |
49 | if (phydev->link) | |
50 | printk(" - %d/%s", phydev->speed, | |
51 | DUPLEX_FULL == phydev->duplex ? | |
52 | "Full" : "Half"); | |
53 | ||
54 | printk("\n"); | |
55 | } | |
56 | EXPORT_SYMBOL(phy_print_status); | |
00db8189 AF |
57 | |
58 | ||
59 | /* Convenience functions for reading/writing a given PHY | |
60 | * register. They MUST NOT be called from interrupt context, | |
61 | * because the bus read/write functions may wait for an interrupt | |
62 | * to conclude the operation. */ | |
63 | int phy_read(struct phy_device *phydev, u16 regnum) | |
64 | { | |
65 | int retval; | |
66 | struct mii_bus *bus = phydev->bus; | |
67 | ||
68 | spin_lock_bh(&bus->mdio_lock); | |
69 | retval = bus->read(bus, phydev->addr, regnum); | |
70 | spin_unlock_bh(&bus->mdio_lock); | |
71 | ||
72 | return retval; | |
73 | } | |
74 | EXPORT_SYMBOL(phy_read); | |
75 | ||
76 | int phy_write(struct phy_device *phydev, u16 regnum, u16 val) | |
77 | { | |
78 | int err; | |
79 | struct mii_bus *bus = phydev->bus; | |
80 | ||
81 | spin_lock_bh(&bus->mdio_lock); | |
82 | err = bus->write(bus, phydev->addr, regnum, val); | |
83 | spin_unlock_bh(&bus->mdio_lock); | |
84 | ||
85 | return err; | |
86 | } | |
87 | EXPORT_SYMBOL(phy_write); | |
88 | ||
89 | ||
90 | int phy_clear_interrupt(struct phy_device *phydev) | |
91 | { | |
92 | int err = 0; | |
93 | ||
94 | if (phydev->drv->ack_interrupt) | |
95 | err = phydev->drv->ack_interrupt(phydev); | |
96 | ||
97 | return err; | |
98 | } | |
99 | ||
100 | ||
101 | int phy_config_interrupt(struct phy_device *phydev, u32 interrupts) | |
102 | { | |
103 | int err = 0; | |
104 | ||
105 | phydev->interrupts = interrupts; | |
106 | if (phydev->drv->config_intr) | |
107 | err = phydev->drv->config_intr(phydev); | |
108 | ||
109 | return err; | |
110 | } | |
111 | ||
112 | ||
113 | /* phy_aneg_done | |
114 | * | |
115 | * description: Reads the status register and returns 0 either if | |
116 | * auto-negotiation is incomplete, or if there was an error. | |
117 | * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. | |
118 | */ | |
119 | static inline int phy_aneg_done(struct phy_device *phydev) | |
120 | { | |
121 | int retval; | |
122 | ||
123 | retval = phy_read(phydev, MII_BMSR); | |
124 | ||
125 | return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); | |
126 | } | |
127 | ||
00db8189 AF |
128 | /* A structure for mapping a particular speed and duplex |
129 | * combination to a particular SUPPORTED and ADVERTISED value */ | |
130 | struct phy_setting { | |
131 | int speed; | |
132 | int duplex; | |
133 | u32 setting; | |
134 | }; | |
135 | ||
136 | /* A mapping of all SUPPORTED settings to speed/duplex */ | |
f71e1309 | 137 | static const struct phy_setting settings[] = { |
00db8189 AF |
138 | { |
139 | .speed = 10000, | |
140 | .duplex = DUPLEX_FULL, | |
141 | .setting = SUPPORTED_10000baseT_Full, | |
142 | }, | |
143 | { | |
144 | .speed = SPEED_1000, | |
145 | .duplex = DUPLEX_FULL, | |
146 | .setting = SUPPORTED_1000baseT_Full, | |
147 | }, | |
148 | { | |
149 | .speed = SPEED_1000, | |
150 | .duplex = DUPLEX_HALF, | |
151 | .setting = SUPPORTED_1000baseT_Half, | |
152 | }, | |
153 | { | |
154 | .speed = SPEED_100, | |
155 | .duplex = DUPLEX_FULL, | |
156 | .setting = SUPPORTED_100baseT_Full, | |
157 | }, | |
158 | { | |
159 | .speed = SPEED_100, | |
160 | .duplex = DUPLEX_HALF, | |
161 | .setting = SUPPORTED_100baseT_Half, | |
162 | }, | |
163 | { | |
164 | .speed = SPEED_10, | |
165 | .duplex = DUPLEX_FULL, | |
166 | .setting = SUPPORTED_10baseT_Full, | |
167 | }, | |
168 | { | |
169 | .speed = SPEED_10, | |
170 | .duplex = DUPLEX_HALF, | |
171 | .setting = SUPPORTED_10baseT_Half, | |
172 | }, | |
173 | }; | |
174 | ||
175 | #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting)) | |
176 | ||
177 | /* phy_find_setting | |
178 | * | |
179 | * description: Searches the settings array for the setting which | |
180 | * matches the desired speed and duplex, and returns the index | |
181 | * of that setting. Returns the index of the last setting if | |
182 | * none of the others match. | |
183 | */ | |
184 | static inline int phy_find_setting(int speed, int duplex) | |
185 | { | |
186 | int idx = 0; | |
187 | ||
188 | while (idx < ARRAY_SIZE(settings) && | |
189 | (settings[idx].speed != speed || | |
190 | settings[idx].duplex != duplex)) | |
191 | idx++; | |
192 | ||
193 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; | |
194 | } | |
195 | ||
196 | /* phy_find_valid | |
197 | * idx: The first index in settings[] to search | |
198 | * features: A mask of the valid settings | |
199 | * | |
200 | * description: Returns the index of the first valid setting less | |
201 | * than or equal to the one pointed to by idx, as determined by | |
202 | * the mask in features. Returns the index of the last setting | |
203 | * if nothing else matches. | |
204 | */ | |
205 | static inline int phy_find_valid(int idx, u32 features) | |
206 | { | |
207 | while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features)) | |
208 | idx++; | |
209 | ||
210 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; | |
211 | } | |
212 | ||
213 | /* phy_sanitize_settings | |
214 | * | |
215 | * description: Make sure the PHY is set to supported speeds and | |
216 | * duplexes. Drop down by one in this order: 1000/FULL, | |
217 | * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF | |
218 | */ | |
e1393456 | 219 | void phy_sanitize_settings(struct phy_device *phydev) |
00db8189 AF |
220 | { |
221 | u32 features = phydev->supported; | |
222 | int idx; | |
223 | ||
224 | /* Sanitize settings based on PHY capabilities */ | |
225 | if ((features & SUPPORTED_Autoneg) == 0) | |
226 | phydev->autoneg = 0; | |
227 | ||
228 | idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex), | |
229 | features); | |
230 | ||
231 | phydev->speed = settings[idx].speed; | |
232 | phydev->duplex = settings[idx].duplex; | |
233 | } | |
e1393456 | 234 | EXPORT_SYMBOL(phy_sanitize_settings); |
00db8189 AF |
235 | |
236 | /* phy_ethtool_sset: | |
237 | * A generic ethtool sset function. Handles all the details | |
238 | * | |
239 | * A few notes about parameter checking: | |
240 | * - We don't set port or transceiver, so we don't care what they | |
241 | * were set to. | |
242 | * - phy_start_aneg() will make sure forced settings are sane, and | |
243 | * choose the next best ones from the ones selected, so we don't | |
244 | * care if ethtool tries to give us bad values | |
e1393456 | 245 | * |
00db8189 AF |
246 | */ |
247 | int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
248 | { | |
249 | if (cmd->phy_address != phydev->addr) | |
250 | return -EINVAL; | |
251 | ||
252 | /* We make sure that we don't pass unsupported | |
253 | * values in to the PHY */ | |
254 | cmd->advertising &= phydev->supported; | |
255 | ||
256 | /* Verify the settings we care about. */ | |
257 | if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) | |
258 | return -EINVAL; | |
259 | ||
260 | if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) | |
261 | return -EINVAL; | |
262 | ||
263 | if (cmd->autoneg == AUTONEG_DISABLE | |
264 | && ((cmd->speed != SPEED_1000 | |
265 | && cmd->speed != SPEED_100 | |
266 | && cmd->speed != SPEED_10) | |
267 | || (cmd->duplex != DUPLEX_HALF | |
268 | && cmd->duplex != DUPLEX_FULL))) | |
269 | return -EINVAL; | |
270 | ||
271 | phydev->autoneg = cmd->autoneg; | |
272 | ||
273 | phydev->speed = cmd->speed; | |
274 | ||
275 | phydev->advertising = cmd->advertising; | |
276 | ||
277 | if (AUTONEG_ENABLE == cmd->autoneg) | |
278 | phydev->advertising |= ADVERTISED_Autoneg; | |
279 | else | |
280 | phydev->advertising &= ~ADVERTISED_Autoneg; | |
281 | ||
282 | phydev->duplex = cmd->duplex; | |
283 | ||
284 | /* Restart the PHY */ | |
285 | phy_start_aneg(phydev); | |
286 | ||
287 | return 0; | |
288 | } | |
9f6d55d0 | 289 | EXPORT_SYMBOL(phy_ethtool_sset); |
00db8189 AF |
290 | |
291 | int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
292 | { | |
293 | cmd->supported = phydev->supported; | |
294 | ||
295 | cmd->advertising = phydev->advertising; | |
296 | ||
297 | cmd->speed = phydev->speed; | |
298 | cmd->duplex = phydev->duplex; | |
299 | cmd->port = PORT_MII; | |
300 | cmd->phy_address = phydev->addr; | |
301 | cmd->transceiver = XCVR_EXTERNAL; | |
302 | cmd->autoneg = phydev->autoneg; | |
303 | ||
304 | return 0; | |
305 | } | |
9f6d55d0 | 306 | EXPORT_SYMBOL(phy_ethtool_gset); |
00db8189 AF |
307 | |
308 | /* Note that this function is currently incompatible with the | |
309 | * PHYCONTROL layer. It changes registers without regard to | |
310 | * current state. Use at own risk | |
311 | */ | |
312 | int phy_mii_ioctl(struct phy_device *phydev, | |
313 | struct mii_ioctl_data *mii_data, int cmd) | |
314 | { | |
315 | u16 val = mii_data->val_in; | |
316 | ||
317 | switch (cmd) { | |
318 | case SIOCGMIIPHY: | |
319 | mii_data->phy_id = phydev->addr; | |
320 | break; | |
321 | case SIOCGMIIREG: | |
322 | mii_data->val_out = phy_read(phydev, mii_data->reg_num); | |
323 | break; | |
324 | ||
325 | case SIOCSMIIREG: | |
326 | if (!capable(CAP_NET_ADMIN)) | |
327 | return -EPERM; | |
328 | ||
329 | if (mii_data->phy_id == phydev->addr) { | |
330 | switch(mii_data->reg_num) { | |
331 | case MII_BMCR: | |
332 | if (val & (BMCR_RESET|BMCR_ANENABLE)) | |
333 | phydev->autoneg = AUTONEG_DISABLE; | |
334 | else | |
335 | phydev->autoneg = AUTONEG_ENABLE; | |
336 | if ((!phydev->autoneg) && (val & BMCR_FULLDPLX)) | |
337 | phydev->duplex = DUPLEX_FULL; | |
338 | else | |
339 | phydev->duplex = DUPLEX_HALF; | |
340 | break; | |
341 | case MII_ADVERTISE: | |
342 | phydev->advertising = val; | |
343 | break; | |
344 | default: | |
345 | /* do nothing */ | |
346 | break; | |
347 | } | |
348 | } | |
349 | ||
350 | phy_write(phydev, mii_data->reg_num, val); | |
351 | ||
352 | if (mii_data->reg_num == MII_BMCR | |
353 | && val & BMCR_RESET | |
354 | && phydev->drv->config_init) | |
355 | phydev->drv->config_init(phydev); | |
356 | break; | |
357 | } | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
e1393456 AF |
362 | /* phy_start_aneg |
363 | * | |
364 | * description: Sanitizes the settings (if we're not | |
365 | * autonegotiating them), and then calls the driver's | |
366 | * config_aneg function. If the PHYCONTROL Layer is operating, | |
367 | * we change the state to reflect the beginning of | |
368 | * Auto-negotiation or forcing. | |
369 | */ | |
370 | int phy_start_aneg(struct phy_device *phydev) | |
371 | { | |
372 | int err; | |
373 | ||
374 | spin_lock(&phydev->lock); | |
375 | ||
376 | if (AUTONEG_DISABLE == phydev->autoneg) | |
377 | phy_sanitize_settings(phydev); | |
378 | ||
379 | err = phydev->drv->config_aneg(phydev); | |
380 | ||
e1393456 AF |
381 | if (err < 0) |
382 | goto out_unlock; | |
383 | ||
384 | if (phydev->state != PHY_HALTED) { | |
385 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
386 | phydev->state = PHY_AN; | |
387 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
388 | } else { | |
389 | phydev->state = PHY_FORCING; | |
390 | phydev->link_timeout = PHY_FORCE_TIMEOUT; | |
391 | } | |
392 | } | |
393 | ||
394 | out_unlock: | |
e1393456 AF |
395 | spin_unlock(&phydev->lock); |
396 | return err; | |
397 | } | |
398 | EXPORT_SYMBOL(phy_start_aneg); | |
399 | ||
400 | ||
c4028958 | 401 | static void phy_change(struct work_struct *work); |
e1393456 AF |
402 | static void phy_timer(unsigned long data); |
403 | ||
00db8189 AF |
404 | /* phy_start_machine: |
405 | * | |
406 | * description: The PHY infrastructure can run a state machine | |
407 | * which tracks whether the PHY is starting up, negotiating, | |
408 | * etc. This function starts the timer which tracks the state | |
409 | * of the PHY. If you want to be notified when the state | |
410 | * changes, pass in the callback, otherwise, pass NULL. If you | |
411 | * want to maintain your own state machine, do not call this | |
412 | * function. */ | |
413 | void phy_start_machine(struct phy_device *phydev, | |
414 | void (*handler)(struct net_device *)) | |
415 | { | |
416 | phydev->adjust_state = handler; | |
417 | ||
418 | init_timer(&phydev->phy_timer); | |
419 | phydev->phy_timer.function = &phy_timer; | |
420 | phydev->phy_timer.data = (unsigned long) phydev; | |
421 | mod_timer(&phydev->phy_timer, jiffies + HZ); | |
422 | } | |
423 | ||
424 | /* phy_stop_machine | |
425 | * | |
817acf5e SS |
426 | * description: Stops the state machine timer, sets the state to UP |
427 | * (unless it wasn't up yet). This function must be called BEFORE | |
00db8189 AF |
428 | * phy_detach. |
429 | */ | |
430 | void phy_stop_machine(struct phy_device *phydev) | |
431 | { | |
432 | del_timer_sync(&phydev->phy_timer); | |
433 | ||
434 | spin_lock(&phydev->lock); | |
435 | if (phydev->state > PHY_UP) | |
436 | phydev->state = PHY_UP; | |
437 | spin_unlock(&phydev->lock); | |
438 | ||
00db8189 AF |
439 | phydev->adjust_state = NULL; |
440 | } | |
441 | ||
e1393456 AF |
442 | /* phy_force_reduction |
443 | * | |
444 | * description: Reduces the speed/duplex settings by | |
445 | * one notch. The order is so: | |
446 | * 1000/FULL, 1000/HALF, 100/FULL, 100/HALF, | |
447 | * 10/FULL, 10/HALF. The function bottoms out at 10/HALF. | |
448 | */ | |
449 | static void phy_force_reduction(struct phy_device *phydev) | |
450 | { | |
451 | int idx; | |
452 | ||
453 | idx = phy_find_setting(phydev->speed, phydev->duplex); | |
454 | ||
455 | idx++; | |
456 | ||
457 | idx = phy_find_valid(idx, phydev->supported); | |
458 | ||
459 | phydev->speed = settings[idx].speed; | |
460 | phydev->duplex = settings[idx].duplex; | |
461 | ||
462 | pr_info("Trying %d/%s\n", phydev->speed, | |
463 | DUPLEX_FULL == phydev->duplex ? | |
464 | "FULL" : "HALF"); | |
465 | } | |
466 | ||
467 | ||
00db8189 AF |
468 | /* phy_error: |
469 | * | |
470 | * Moves the PHY to the HALTED state in response to a read | |
471 | * or write error, and tells the controller the link is down. | |
472 | * Must not be called from interrupt context, or while the | |
473 | * phydev->lock is held. | |
474 | */ | |
475 | void phy_error(struct phy_device *phydev) | |
476 | { | |
477 | spin_lock(&phydev->lock); | |
478 | phydev->state = PHY_HALTED; | |
479 | spin_unlock(&phydev->lock); | |
480 | } | |
481 | ||
e1393456 AF |
482 | /* phy_interrupt |
483 | * | |
484 | * description: When a PHY interrupt occurs, the handler disables | |
485 | * interrupts, and schedules a work task to clear the interrupt. | |
486 | */ | |
7d12e780 | 487 | static irqreturn_t phy_interrupt(int irq, void *phy_dat) |
e1393456 AF |
488 | { |
489 | struct phy_device *phydev = phy_dat; | |
490 | ||
3c3070d7 MR |
491 | if (PHY_HALTED == phydev->state) |
492 | return IRQ_NONE; /* It can't be ours. */ | |
493 | ||
e1393456 AF |
494 | /* The MDIO bus is not allowed to be written in interrupt |
495 | * context, so we need to disable the irq here. A work | |
496 | * queue will write the PHY to disable and clear the | |
497 | * interrupt, and then reenable the irq line. */ | |
498 | disable_irq_nosync(irq); | |
499 | ||
500 | schedule_work(&phydev->phy_queue); | |
501 | ||
502 | return IRQ_HANDLED; | |
503 | } | |
504 | ||
505 | /* Enable the interrupts from the PHY side */ | |
506 | int phy_enable_interrupts(struct phy_device *phydev) | |
00db8189 AF |
507 | { |
508 | int err; | |
509 | ||
e1393456 | 510 | err = phy_clear_interrupt(phydev); |
00db8189 | 511 | |
e1393456 AF |
512 | if (err < 0) |
513 | return err; | |
00db8189 | 514 | |
e1393456 | 515 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); |
00db8189 AF |
516 | |
517 | return err; | |
518 | } | |
e1393456 | 519 | EXPORT_SYMBOL(phy_enable_interrupts); |
00db8189 AF |
520 | |
521 | /* Disable the PHY interrupts from the PHY side */ | |
e1393456 | 522 | int phy_disable_interrupts(struct phy_device *phydev) |
00db8189 AF |
523 | { |
524 | int err; | |
525 | ||
526 | /* Disable PHY interrupts */ | |
527 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
528 | ||
529 | if (err) | |
530 | goto phy_err; | |
531 | ||
532 | /* Clear the interrupt */ | |
533 | err = phy_clear_interrupt(phydev); | |
534 | ||
535 | if (err) | |
536 | goto phy_err; | |
537 | ||
538 | return 0; | |
539 | ||
540 | phy_err: | |
541 | phy_error(phydev); | |
542 | ||
543 | return err; | |
544 | } | |
e1393456 AF |
545 | EXPORT_SYMBOL(phy_disable_interrupts); |
546 | ||
547 | /* phy_start_interrupts | |
548 | * | |
549 | * description: Request the interrupt for the given PHY. If | |
550 | * this fails, then we set irq to PHY_POLL. | |
551 | * Otherwise, we enable the interrupts in the PHY. | |
552 | * Returns 0 on success. | |
553 | * This should only be called with a valid IRQ number. | |
554 | */ | |
555 | int phy_start_interrupts(struct phy_device *phydev) | |
556 | { | |
557 | int err = 0; | |
558 | ||
c4028958 | 559 | INIT_WORK(&phydev->phy_queue, phy_change); |
e1393456 AF |
560 | |
561 | if (request_irq(phydev->irq, phy_interrupt, | |
1fb9df5d | 562 | IRQF_SHARED, |
e1393456 AF |
563 | "phy_interrupt", |
564 | phydev) < 0) { | |
565 | printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n", | |
566 | phydev->bus->name, | |
567 | phydev->irq); | |
568 | phydev->irq = PHY_POLL; | |
569 | return 0; | |
570 | } | |
571 | ||
572 | err = phy_enable_interrupts(phydev); | |
573 | ||
574 | return err; | |
575 | } | |
576 | EXPORT_SYMBOL(phy_start_interrupts); | |
577 | ||
578 | int phy_stop_interrupts(struct phy_device *phydev) | |
579 | { | |
580 | int err; | |
581 | ||
582 | err = phy_disable_interrupts(phydev); | |
583 | ||
584 | if (err) | |
585 | phy_error(phydev); | |
586 | ||
3c3070d7 MR |
587 | /* |
588 | * Finish any pending work; we might have been scheduled | |
589 | * to be called from keventd ourselves, though. | |
590 | */ | |
68380b58 | 591 | run_scheduled_work(&phydev->phy_queue); |
3c3070d7 | 592 | |
e1393456 AF |
593 | free_irq(phydev->irq, phydev); |
594 | ||
595 | return err; | |
596 | } | |
597 | EXPORT_SYMBOL(phy_stop_interrupts); | |
598 | ||
599 | ||
600 | /* Scheduled by the phy_interrupt/timer to handle PHY changes */ | |
c4028958 | 601 | static void phy_change(struct work_struct *work) |
e1393456 AF |
602 | { |
603 | int err; | |
c4028958 DH |
604 | struct phy_device *phydev = |
605 | container_of(work, struct phy_device, phy_queue); | |
e1393456 AF |
606 | |
607 | err = phy_disable_interrupts(phydev); | |
608 | ||
609 | if (err) | |
610 | goto phy_err; | |
611 | ||
612 | spin_lock(&phydev->lock); | |
613 | if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state)) | |
614 | phydev->state = PHY_CHANGELINK; | |
615 | spin_unlock(&phydev->lock); | |
616 | ||
617 | enable_irq(phydev->irq); | |
618 | ||
619 | /* Reenable interrupts */ | |
3c3070d7 MR |
620 | if (PHY_HALTED != phydev->state) |
621 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); | |
e1393456 AF |
622 | |
623 | if (err) | |
624 | goto irq_enable_err; | |
625 | ||
626 | return; | |
627 | ||
628 | irq_enable_err: | |
629 | disable_irq(phydev->irq); | |
630 | phy_err: | |
631 | phy_error(phydev); | |
632 | } | |
633 | ||
634 | /* Bring down the PHY link, and stop checking the status. */ | |
635 | void phy_stop(struct phy_device *phydev) | |
636 | { | |
637 | spin_lock(&phydev->lock); | |
638 | ||
639 | if (PHY_HALTED == phydev->state) | |
640 | goto out_unlock; | |
641 | ||
3c3070d7 | 642 | phydev->state = PHY_HALTED; |
e1393456 | 643 | |
3c3070d7 | 644 | if (phydev->irq != PHY_POLL) { |
e1393456 AF |
645 | /* Disable PHY Interrupts */ |
646 | phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
e1393456 | 647 | |
3c3070d7 MR |
648 | /* Clear any pending interrupts */ |
649 | phy_clear_interrupt(phydev); | |
650 | } | |
e1393456 AF |
651 | |
652 | out_unlock: | |
653 | spin_unlock(&phydev->lock); | |
3c3070d7 MR |
654 | |
655 | /* | |
656 | * Cannot call flush_scheduled_work() here as desired because | |
657 | * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change() | |
658 | * will not reenable interrupts. | |
659 | */ | |
e1393456 AF |
660 | } |
661 | ||
662 | ||
663 | /* phy_start | |
664 | * | |
665 | * description: Indicates the attached device's readiness to | |
666 | * handle PHY-related work. Used during startup to start the | |
667 | * PHY, and after a call to phy_stop() to resume operation. | |
668 | * Also used to indicate the MDIO bus has cleared an error | |
669 | * condition. | |
670 | */ | |
671 | void phy_start(struct phy_device *phydev) | |
672 | { | |
673 | spin_lock(&phydev->lock); | |
674 | ||
675 | switch (phydev->state) { | |
676 | case PHY_STARTING: | |
677 | phydev->state = PHY_PENDING; | |
678 | break; | |
679 | case PHY_READY: | |
680 | phydev->state = PHY_UP; | |
681 | break; | |
682 | case PHY_HALTED: | |
683 | phydev->state = PHY_RESUMING; | |
684 | default: | |
685 | break; | |
686 | } | |
687 | spin_unlock(&phydev->lock); | |
688 | } | |
689 | EXPORT_SYMBOL(phy_stop); | |
690 | EXPORT_SYMBOL(phy_start); | |
67c4f3fa | 691 | |
00db8189 AF |
692 | /* PHY timer which handles the state machine */ |
693 | static void phy_timer(unsigned long data) | |
694 | { | |
695 | struct phy_device *phydev = (struct phy_device *)data; | |
696 | int needs_aneg = 0; | |
697 | int err = 0; | |
698 | ||
699 | spin_lock(&phydev->lock); | |
700 | ||
701 | if (phydev->adjust_state) | |
702 | phydev->adjust_state(phydev->attached_dev); | |
703 | ||
704 | switch(phydev->state) { | |
705 | case PHY_DOWN: | |
706 | case PHY_STARTING: | |
707 | case PHY_READY: | |
708 | case PHY_PENDING: | |
709 | break; | |
710 | case PHY_UP: | |
711 | needs_aneg = 1; | |
712 | ||
713 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
714 | ||
715 | break; | |
716 | case PHY_AN: | |
6b655529 AF |
717 | err = phy_read_status(phydev); |
718 | ||
719 | if (err < 0) | |
720 | break; | |
721 | ||
722 | /* If the link is down, give up on | |
723 | * negotiation for now */ | |
724 | if (!phydev->link) { | |
725 | phydev->state = PHY_NOLINK; | |
726 | netif_carrier_off(phydev->attached_dev); | |
727 | phydev->adjust_link(phydev->attached_dev); | |
728 | break; | |
729 | } | |
730 | ||
00db8189 AF |
731 | /* Check if negotiation is done. Break |
732 | * if there's an error */ | |
733 | err = phy_aneg_done(phydev); | |
734 | if (err < 0) | |
735 | break; | |
736 | ||
6b655529 | 737 | /* If AN is done, we're running */ |
00db8189 | 738 | if (err > 0) { |
6b655529 AF |
739 | phydev->state = PHY_RUNNING; |
740 | netif_carrier_on(phydev->attached_dev); | |
741 | phydev->adjust_link(phydev->attached_dev); | |
00db8189 | 742 | |
6b655529 AF |
743 | } else if (0 == phydev->link_timeout--) { |
744 | int idx; | |
00db8189 | 745 | |
6b655529 AF |
746 | needs_aneg = 1; |
747 | /* If we have the magic_aneg bit, | |
748 | * we try again */ | |
749 | if (phydev->drv->flags & PHY_HAS_MAGICANEG) | |
00db8189 AF |
750 | break; |
751 | ||
6b655529 AF |
752 | /* The timer expired, and we still |
753 | * don't have a setting, so we try | |
754 | * forcing it until we find one that | |
755 | * works, starting from the fastest speed, | |
756 | * and working our way down */ | |
757 | idx = phy_find_valid(0, phydev->supported); | |
00db8189 | 758 | |
6b655529 AF |
759 | phydev->speed = settings[idx].speed; |
760 | phydev->duplex = settings[idx].duplex; | |
00db8189 | 761 | |
6b655529 | 762 | phydev->autoneg = AUTONEG_DISABLE; |
00db8189 | 763 | |
6b655529 AF |
764 | pr_info("Trying %d/%s\n", phydev->speed, |
765 | DUPLEX_FULL == | |
766 | phydev->duplex ? | |
767 | "FULL" : "HALF"); | |
00db8189 AF |
768 | } |
769 | break; | |
770 | case PHY_NOLINK: | |
771 | err = phy_read_status(phydev); | |
772 | ||
773 | if (err) | |
774 | break; | |
775 | ||
776 | if (phydev->link) { | |
777 | phydev->state = PHY_RUNNING; | |
778 | netif_carrier_on(phydev->attached_dev); | |
779 | phydev->adjust_link(phydev->attached_dev); | |
780 | } | |
781 | break; | |
782 | case PHY_FORCING: | |
6b655529 | 783 | err = genphy_update_link(phydev); |
00db8189 AF |
784 | |
785 | if (err) | |
786 | break; | |
787 | ||
788 | if (phydev->link) { | |
789 | phydev->state = PHY_RUNNING; | |
790 | netif_carrier_on(phydev->attached_dev); | |
791 | } else { | |
792 | if (0 == phydev->link_timeout--) { | |
793 | phy_force_reduction(phydev); | |
794 | needs_aneg = 1; | |
795 | } | |
796 | } | |
797 | ||
798 | phydev->adjust_link(phydev->attached_dev); | |
799 | break; | |
800 | case PHY_RUNNING: | |
801 | /* Only register a CHANGE if we are | |
802 | * polling */ | |
803 | if (PHY_POLL == phydev->irq) | |
804 | phydev->state = PHY_CHANGELINK; | |
805 | break; | |
806 | case PHY_CHANGELINK: | |
807 | err = phy_read_status(phydev); | |
808 | ||
809 | if (err) | |
810 | break; | |
811 | ||
812 | if (phydev->link) { | |
813 | phydev->state = PHY_RUNNING; | |
814 | netif_carrier_on(phydev->attached_dev); | |
815 | } else { | |
816 | phydev->state = PHY_NOLINK; | |
817 | netif_carrier_off(phydev->attached_dev); | |
818 | } | |
819 | ||
820 | phydev->adjust_link(phydev->attached_dev); | |
821 | ||
822 | if (PHY_POLL != phydev->irq) | |
823 | err = phy_config_interrupt(phydev, | |
824 | PHY_INTERRUPT_ENABLED); | |
825 | break; | |
826 | case PHY_HALTED: | |
827 | if (phydev->link) { | |
828 | phydev->link = 0; | |
829 | netif_carrier_off(phydev->attached_dev); | |
830 | phydev->adjust_link(phydev->attached_dev); | |
831 | } | |
832 | break; | |
833 | case PHY_RESUMING: | |
834 | ||
835 | err = phy_clear_interrupt(phydev); | |
836 | ||
837 | if (err) | |
838 | break; | |
839 | ||
840 | err = phy_config_interrupt(phydev, | |
841 | PHY_INTERRUPT_ENABLED); | |
842 | ||
843 | if (err) | |
844 | break; | |
845 | ||
846 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
847 | err = phy_aneg_done(phydev); | |
848 | if (err < 0) | |
849 | break; | |
850 | ||
851 | /* err > 0 if AN is done. | |
852 | * Otherwise, it's 0, and we're | |
853 | * still waiting for AN */ | |
854 | if (err > 0) { | |
855 | phydev->state = PHY_RUNNING; | |
856 | } else { | |
857 | phydev->state = PHY_AN; | |
858 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
859 | } | |
860 | } else | |
861 | phydev->state = PHY_RUNNING; | |
862 | break; | |
863 | } | |
864 | ||
865 | spin_unlock(&phydev->lock); | |
866 | ||
867 | if (needs_aneg) | |
868 | err = phy_start_aneg(phydev); | |
869 | ||
870 | if (err < 0) | |
871 | phy_error(phydev); | |
872 | ||
873 | mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ); | |
874 | } | |
875 |