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