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