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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. | |
0ac49527 | 10 | * Copyright (c) 2006, 2007 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 | */ | |
8d242488 JP |
18 | |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
00db8189 | 21 | #include <linux/kernel.h> |
00db8189 AF |
22 | #include <linux/string.h> |
23 | #include <linux/errno.h> | |
24 | #include <linux/unistd.h> | |
00db8189 AF |
25 | #include <linux/interrupt.h> |
26 | #include <linux/init.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/etherdevice.h> | |
30 | #include <linux/skbuff.h> | |
00db8189 AF |
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 | 38 | |
60063497 | 39 | #include <linux/atomic.h> |
00db8189 AF |
40 | #include <asm/io.h> |
41 | #include <asm/irq.h> | |
42 | #include <asm/uaccess.h> | |
43 | ||
b3df0da8 RD |
44 | /** |
45 | * phy_print_status - Convenience function to print out the current phy status | |
46 | * @phydev: the phy_device struct | |
e1393456 AF |
47 | */ |
48 | void phy_print_status(struct phy_device *phydev) | |
49 | { | |
e1393456 | 50 | if (phydev->link) |
8d242488 JP |
51 | pr_info("%s - Link is Up - %d/%s\n", |
52 | dev_name(&phydev->dev), | |
53 | phydev->speed, | |
54 | DUPLEX_FULL == phydev->duplex ? "Full" : "Half"); | |
55 | else | |
56 | pr_info("%s - Link is Down\n", dev_name(&phydev->dev)); | |
e1393456 AF |
57 | } |
58 | EXPORT_SYMBOL(phy_print_status); | |
00db8189 | 59 | |
b3df0da8 RD |
60 | /** |
61 | * phy_clear_interrupt - Ack the phy device's interrupt | |
62 | * @phydev: the phy_device struct | |
63 | * | |
64 | * If the @phydev driver has an ack_interrupt function, call it to | |
65 | * ack and clear the phy device's interrupt. | |
66 | * | |
67 | * Returns 0 on success on < 0 on error. | |
68 | */ | |
89ff05ec | 69 | static int phy_clear_interrupt(struct phy_device *phydev) |
00db8189 AF |
70 | { |
71 | int err = 0; | |
72 | ||
73 | if (phydev->drv->ack_interrupt) | |
74 | err = phydev->drv->ack_interrupt(phydev); | |
75 | ||
76 | return err; | |
77 | } | |
78 | ||
b3df0da8 RD |
79 | /** |
80 | * phy_config_interrupt - configure the PHY device for the requested interrupts | |
81 | * @phydev: the phy_device struct | |
82 | * @interrupts: interrupt flags to configure for this @phydev | |
83 | * | |
84 | * Returns 0 on success on < 0 on error. | |
85 | */ | |
89ff05ec | 86 | static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts) |
00db8189 AF |
87 | { |
88 | int err = 0; | |
89 | ||
90 | phydev->interrupts = interrupts; | |
91 | if (phydev->drv->config_intr) | |
92 | err = phydev->drv->config_intr(phydev); | |
93 | ||
94 | return err; | |
95 | } | |
96 | ||
97 | ||
b3df0da8 RD |
98 | /** |
99 | * phy_aneg_done - return auto-negotiation status | |
100 | * @phydev: target phy_device struct | |
00db8189 | 101 | * |
b3df0da8 | 102 | * Description: Reads the status register and returns 0 either if |
00db8189 AF |
103 | * auto-negotiation is incomplete, or if there was an error. |
104 | * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. | |
105 | */ | |
106 | static inline int phy_aneg_done(struct phy_device *phydev) | |
107 | { | |
108 | int retval; | |
109 | ||
110 | retval = phy_read(phydev, MII_BMSR); | |
111 | ||
112 | return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); | |
113 | } | |
114 | ||
00db8189 AF |
115 | /* A structure for mapping a particular speed and duplex |
116 | * combination to a particular SUPPORTED and ADVERTISED value */ | |
117 | struct phy_setting { | |
118 | int speed; | |
119 | int duplex; | |
120 | u32 setting; | |
121 | }; | |
122 | ||
123 | /* A mapping of all SUPPORTED settings to speed/duplex */ | |
f71e1309 | 124 | static const struct phy_setting settings[] = { |
00db8189 AF |
125 | { |
126 | .speed = 10000, | |
127 | .duplex = DUPLEX_FULL, | |
128 | .setting = SUPPORTED_10000baseT_Full, | |
129 | }, | |
130 | { | |
131 | .speed = SPEED_1000, | |
132 | .duplex = DUPLEX_FULL, | |
133 | .setting = SUPPORTED_1000baseT_Full, | |
134 | }, | |
135 | { | |
136 | .speed = SPEED_1000, | |
137 | .duplex = DUPLEX_HALF, | |
138 | .setting = SUPPORTED_1000baseT_Half, | |
139 | }, | |
140 | { | |
141 | .speed = SPEED_100, | |
142 | .duplex = DUPLEX_FULL, | |
143 | .setting = SUPPORTED_100baseT_Full, | |
144 | }, | |
145 | { | |
146 | .speed = SPEED_100, | |
147 | .duplex = DUPLEX_HALF, | |
148 | .setting = SUPPORTED_100baseT_Half, | |
149 | }, | |
150 | { | |
151 | .speed = SPEED_10, | |
152 | .duplex = DUPLEX_FULL, | |
153 | .setting = SUPPORTED_10baseT_Full, | |
154 | }, | |
155 | { | |
156 | .speed = SPEED_10, | |
157 | .duplex = DUPLEX_HALF, | |
158 | .setting = SUPPORTED_10baseT_Half, | |
159 | }, | |
160 | }; | |
161 | ||
ff8ac609 | 162 | #define MAX_NUM_SETTINGS ARRAY_SIZE(settings) |
00db8189 | 163 | |
b3df0da8 RD |
164 | /** |
165 | * phy_find_setting - find a PHY settings array entry that matches speed & duplex | |
166 | * @speed: speed to match | |
167 | * @duplex: duplex to match | |
00db8189 | 168 | * |
b3df0da8 | 169 | * Description: Searches the settings array for the setting which |
00db8189 AF |
170 | * matches the desired speed and duplex, and returns the index |
171 | * of that setting. Returns the index of the last setting if | |
172 | * none of the others match. | |
173 | */ | |
174 | static inline int phy_find_setting(int speed, int duplex) | |
175 | { | |
176 | int idx = 0; | |
177 | ||
178 | while (idx < ARRAY_SIZE(settings) && | |
179 | (settings[idx].speed != speed || | |
180 | settings[idx].duplex != duplex)) | |
181 | idx++; | |
182 | ||
183 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; | |
184 | } | |
185 | ||
b3df0da8 RD |
186 | /** |
187 | * phy_find_valid - find a PHY setting that matches the requested features mask | |
188 | * @idx: The first index in settings[] to search | |
189 | * @features: A mask of the valid settings | |
00db8189 | 190 | * |
b3df0da8 | 191 | * Description: Returns the index of the first valid setting less |
00db8189 AF |
192 | * than or equal to the one pointed to by idx, as determined by |
193 | * the mask in features. Returns the index of the last setting | |
194 | * if nothing else matches. | |
195 | */ | |
196 | static inline int phy_find_valid(int idx, u32 features) | |
197 | { | |
198 | while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features)) | |
199 | idx++; | |
200 | ||
201 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; | |
202 | } | |
203 | ||
b3df0da8 RD |
204 | /** |
205 | * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex | |
206 | * @phydev: the target phy_device struct | |
00db8189 | 207 | * |
b3df0da8 | 208 | * Description: Make sure the PHY is set to supported speeds and |
00db8189 | 209 | * duplexes. Drop down by one in this order: 1000/FULL, |
b3df0da8 | 210 | * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. |
00db8189 | 211 | */ |
89ff05ec | 212 | static void phy_sanitize_settings(struct phy_device *phydev) |
00db8189 AF |
213 | { |
214 | u32 features = phydev->supported; | |
215 | int idx; | |
216 | ||
217 | /* Sanitize settings based on PHY capabilities */ | |
218 | if ((features & SUPPORTED_Autoneg) == 0) | |
163642a2 | 219 | phydev->autoneg = AUTONEG_DISABLE; |
00db8189 AF |
220 | |
221 | idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex), | |
222 | features); | |
223 | ||
224 | phydev->speed = settings[idx].speed; | |
225 | phydev->duplex = settings[idx].duplex; | |
226 | } | |
00db8189 | 227 | |
b3df0da8 RD |
228 | /** |
229 | * phy_ethtool_sset - generic ethtool sset function, handles all the details | |
230 | * @phydev: target phy_device struct | |
231 | * @cmd: ethtool_cmd | |
00db8189 AF |
232 | * |
233 | * A few notes about parameter checking: | |
234 | * - We don't set port or transceiver, so we don't care what they | |
235 | * were set to. | |
236 | * - phy_start_aneg() will make sure forced settings are sane, and | |
237 | * choose the next best ones from the ones selected, so we don't | |
b3df0da8 | 238 | * care if ethtool tries to give us bad values. |
00db8189 AF |
239 | */ |
240 | int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
241 | { | |
25db0338 DD |
242 | u32 speed = ethtool_cmd_speed(cmd); |
243 | ||
00db8189 AF |
244 | if (cmd->phy_address != phydev->addr) |
245 | return -EINVAL; | |
246 | ||
247 | /* We make sure that we don't pass unsupported | |
248 | * values in to the PHY */ | |
249 | cmd->advertising &= phydev->supported; | |
250 | ||
251 | /* Verify the settings we care about. */ | |
252 | if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) | |
253 | return -EINVAL; | |
254 | ||
255 | if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) | |
256 | return -EINVAL; | |
257 | ||
8e95a202 | 258 | if (cmd->autoneg == AUTONEG_DISABLE && |
25db0338 DD |
259 | ((speed != SPEED_1000 && |
260 | speed != SPEED_100 && | |
261 | speed != SPEED_10) || | |
8e95a202 JP |
262 | (cmd->duplex != DUPLEX_HALF && |
263 | cmd->duplex != DUPLEX_FULL))) | |
00db8189 AF |
264 | return -EINVAL; |
265 | ||
266 | phydev->autoneg = cmd->autoneg; | |
267 | ||
25db0338 | 268 | phydev->speed = speed; |
00db8189 AF |
269 | |
270 | phydev->advertising = cmd->advertising; | |
271 | ||
272 | if (AUTONEG_ENABLE == cmd->autoneg) | |
273 | phydev->advertising |= ADVERTISED_Autoneg; | |
274 | else | |
275 | phydev->advertising &= ~ADVERTISED_Autoneg; | |
276 | ||
277 | phydev->duplex = cmd->duplex; | |
278 | ||
279 | /* Restart the PHY */ | |
280 | phy_start_aneg(phydev); | |
281 | ||
282 | return 0; | |
283 | } | |
9f6d55d0 | 284 | EXPORT_SYMBOL(phy_ethtool_sset); |
00db8189 AF |
285 | |
286 | int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
287 | { | |
288 | cmd->supported = phydev->supported; | |
289 | ||
290 | cmd->advertising = phydev->advertising; | |
291 | ||
70739497 | 292 | ethtool_cmd_speed_set(cmd, phydev->speed); |
00db8189 AF |
293 | cmd->duplex = phydev->duplex; |
294 | cmd->port = PORT_MII; | |
295 | cmd->phy_address = phydev->addr; | |
296 | cmd->transceiver = XCVR_EXTERNAL; | |
297 | cmd->autoneg = phydev->autoneg; | |
298 | ||
299 | return 0; | |
300 | } | |
9f6d55d0 | 301 | EXPORT_SYMBOL(phy_ethtool_gset); |
00db8189 | 302 | |
b3df0da8 RD |
303 | /** |
304 | * phy_mii_ioctl - generic PHY MII ioctl interface | |
305 | * @phydev: the phy_device struct | |
00c7d920 | 306 | * @ifr: &struct ifreq for socket ioctl's |
b3df0da8 RD |
307 | * @cmd: ioctl cmd to execute |
308 | * | |
309 | * Note that this function is currently incompatible with the | |
00db8189 | 310 | * PHYCONTROL layer. It changes registers without regard to |
b3df0da8 | 311 | * current state. Use at own risk. |
00db8189 AF |
312 | */ |
313 | int phy_mii_ioctl(struct phy_device *phydev, | |
28b04113 | 314 | struct ifreq *ifr, int cmd) |
00db8189 | 315 | { |
28b04113 | 316 | struct mii_ioctl_data *mii_data = if_mii(ifr); |
00db8189 AF |
317 | u16 val = mii_data->val_in; |
318 | ||
319 | switch (cmd) { | |
320 | case SIOCGMIIPHY: | |
321 | mii_data->phy_id = phydev->addr; | |
c6d6a511 LB |
322 | /* fall through */ |
323 | ||
00db8189 | 324 | case SIOCGMIIREG: |
af1dc13e PK |
325 | mii_data->val_out = mdiobus_read(phydev->bus, mii_data->phy_id, |
326 | mii_data->reg_num); | |
00db8189 AF |
327 | break; |
328 | ||
329 | case SIOCSMIIREG: | |
00db8189 AF |
330 | if (mii_data->phy_id == phydev->addr) { |
331 | switch(mii_data->reg_num) { | |
332 | case MII_BMCR: | |
163642a2 | 333 | if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0) |
00db8189 AF |
334 | phydev->autoneg = AUTONEG_DISABLE; |
335 | else | |
336 | phydev->autoneg = AUTONEG_ENABLE; | |
337 | if ((!phydev->autoneg) && (val & BMCR_FULLDPLX)) | |
338 | phydev->duplex = DUPLEX_FULL; | |
339 | else | |
340 | phydev->duplex = DUPLEX_HALF; | |
024a0a3c SL |
341 | if ((!phydev->autoneg) && |
342 | (val & BMCR_SPEED1000)) | |
343 | phydev->speed = SPEED_1000; | |
344 | else if ((!phydev->autoneg) && | |
345 | (val & BMCR_SPEED100)) | |
346 | phydev->speed = SPEED_100; | |
00db8189 AF |
347 | break; |
348 | case MII_ADVERTISE: | |
349 | phydev->advertising = val; | |
350 | break; | |
351 | default: | |
352 | /* do nothing */ | |
353 | break; | |
354 | } | |
355 | } | |
356 | ||
af1dc13e PK |
357 | mdiobus_write(phydev->bus, mii_data->phy_id, |
358 | mii_data->reg_num, val); | |
359 | ||
8e95a202 JP |
360 | if (mii_data->reg_num == MII_BMCR && |
361 | val & BMCR_RESET && | |
362 | phydev->drv->config_init) { | |
f62220d3 | 363 | phy_scan_fixups(phydev); |
00db8189 | 364 | phydev->drv->config_init(phydev); |
f62220d3 | 365 | } |
00db8189 | 366 | break; |
dda93b48 | 367 | |
c1f19b51 RC |
368 | case SIOCSHWTSTAMP: |
369 | if (phydev->drv->hwtstamp) | |
370 | return phydev->drv->hwtstamp(phydev, ifr); | |
371 | /* fall through */ | |
372 | ||
dda93b48 | 373 | default: |
c6d6a511 | 374 | return -EOPNOTSUPP; |
00db8189 AF |
375 | } |
376 | ||
377 | return 0; | |
378 | } | |
680e9fe9 | 379 | EXPORT_SYMBOL(phy_mii_ioctl); |
00db8189 | 380 | |
b3df0da8 RD |
381 | /** |
382 | * phy_start_aneg - start auto-negotiation for this PHY device | |
383 | * @phydev: the phy_device struct | |
e1393456 | 384 | * |
b3df0da8 RD |
385 | * Description: Sanitizes the settings (if we're not autonegotiating |
386 | * them), and then calls the driver's config_aneg function. | |
387 | * If the PHYCONTROL Layer is operating, we change the state to | |
388 | * reflect the beginning of Auto-negotiation or forcing. | |
e1393456 AF |
389 | */ |
390 | int phy_start_aneg(struct phy_device *phydev) | |
391 | { | |
392 | int err; | |
393 | ||
35b5f6b1 | 394 | mutex_lock(&phydev->lock); |
e1393456 AF |
395 | |
396 | if (AUTONEG_DISABLE == phydev->autoneg) | |
397 | phy_sanitize_settings(phydev); | |
398 | ||
399 | err = phydev->drv->config_aneg(phydev); | |
400 | ||
e1393456 AF |
401 | if (err < 0) |
402 | goto out_unlock; | |
403 | ||
404 | if (phydev->state != PHY_HALTED) { | |
405 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
406 | phydev->state = PHY_AN; | |
407 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
408 | } else { | |
409 | phydev->state = PHY_FORCING; | |
410 | phydev->link_timeout = PHY_FORCE_TIMEOUT; | |
411 | } | |
412 | } | |
413 | ||
414 | out_unlock: | |
35b5f6b1 | 415 | mutex_unlock(&phydev->lock); |
e1393456 AF |
416 | return err; |
417 | } | |
418 | EXPORT_SYMBOL(phy_start_aneg); | |
419 | ||
420 | ||
c4028958 | 421 | static void phy_change(struct work_struct *work); |
e1393456 | 422 | |
b3df0da8 RD |
423 | /** |
424 | * phy_start_machine - start PHY state machine tracking | |
425 | * @phydev: the phy_device struct | |
426 | * @handler: callback function for state change notifications | |
00db8189 | 427 | * |
b3df0da8 | 428 | * Description: The PHY infrastructure can run a state machine |
00db8189 AF |
429 | * which tracks whether the PHY is starting up, negotiating, |
430 | * etc. This function starts the timer which tracks the state | |
b3df0da8 RD |
431 | * of the PHY. If you want to be notified when the state changes, |
432 | * pass in the callback @handler, otherwise, pass NULL. If you | |
00db8189 | 433 | * want to maintain your own state machine, do not call this |
b3df0da8 RD |
434 | * function. |
435 | */ | |
00db8189 AF |
436 | void phy_start_machine(struct phy_device *phydev, |
437 | void (*handler)(struct net_device *)) | |
438 | { | |
439 | phydev->adjust_state = handler; | |
440 | ||
3664090e | 441 | schedule_delayed_work(&phydev->state_queue, HZ); |
00db8189 AF |
442 | } |
443 | ||
b3df0da8 RD |
444 | /** |
445 | * phy_stop_machine - stop the PHY state machine tracking | |
446 | * @phydev: target phy_device struct | |
00db8189 | 447 | * |
b3df0da8 | 448 | * Description: Stops the state machine timer, sets the state to UP |
817acf5e | 449 | * (unless it wasn't up yet). This function must be called BEFORE |
00db8189 AF |
450 | * phy_detach. |
451 | */ | |
452 | void phy_stop_machine(struct phy_device *phydev) | |
453 | { | |
a390d1f3 | 454 | cancel_delayed_work_sync(&phydev->state_queue); |
00db8189 | 455 | |
35b5f6b1 | 456 | mutex_lock(&phydev->lock); |
00db8189 AF |
457 | if (phydev->state > PHY_UP) |
458 | phydev->state = PHY_UP; | |
35b5f6b1 | 459 | mutex_unlock(&phydev->lock); |
00db8189 | 460 | |
00db8189 AF |
461 | phydev->adjust_state = NULL; |
462 | } | |
463 | ||
b3df0da8 RD |
464 | /** |
465 | * phy_force_reduction - reduce PHY speed/duplex settings by one step | |
466 | * @phydev: target phy_device struct | |
e1393456 | 467 | * |
b3df0da8 RD |
468 | * Description: Reduces the speed/duplex settings by one notch, |
469 | * in this order-- | |
470 | * 1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. | |
471 | * The function bottoms out at 10/HALF. | |
e1393456 AF |
472 | */ |
473 | static void phy_force_reduction(struct phy_device *phydev) | |
474 | { | |
475 | int idx; | |
476 | ||
477 | idx = phy_find_setting(phydev->speed, phydev->duplex); | |
478 | ||
479 | idx++; | |
480 | ||
481 | idx = phy_find_valid(idx, phydev->supported); | |
482 | ||
483 | phydev->speed = settings[idx].speed; | |
484 | phydev->duplex = settings[idx].duplex; | |
485 | ||
8d242488 JP |
486 | pr_info("Trying %d/%s\n", |
487 | phydev->speed, DUPLEX_FULL == phydev->duplex ? "FULL" : "HALF"); | |
e1393456 AF |
488 | } |
489 | ||
490 | ||
b3df0da8 RD |
491 | /** |
492 | * phy_error - enter HALTED state for this PHY device | |
493 | * @phydev: target phy_device struct | |
00db8189 AF |
494 | * |
495 | * Moves the PHY to the HALTED state in response to a read | |
496 | * or write error, and tells the controller the link is down. | |
497 | * Must not be called from interrupt context, or while the | |
498 | * phydev->lock is held. | |
499 | */ | |
9b9a8bfc | 500 | static void phy_error(struct phy_device *phydev) |
00db8189 | 501 | { |
35b5f6b1 | 502 | mutex_lock(&phydev->lock); |
00db8189 | 503 | phydev->state = PHY_HALTED; |
35b5f6b1 | 504 | mutex_unlock(&phydev->lock); |
00db8189 AF |
505 | } |
506 | ||
b3df0da8 RD |
507 | /** |
508 | * phy_interrupt - PHY interrupt handler | |
509 | * @irq: interrupt line | |
510 | * @phy_dat: phy_device pointer | |
e1393456 | 511 | * |
b3df0da8 | 512 | * Description: When a PHY interrupt occurs, the handler disables |
e1393456 AF |
513 | * interrupts, and schedules a work task to clear the interrupt. |
514 | */ | |
7d12e780 | 515 | static irqreturn_t phy_interrupt(int irq, void *phy_dat) |
e1393456 AF |
516 | { |
517 | struct phy_device *phydev = phy_dat; | |
518 | ||
3c3070d7 MR |
519 | if (PHY_HALTED == phydev->state) |
520 | return IRQ_NONE; /* It can't be ours. */ | |
521 | ||
e1393456 AF |
522 | /* The MDIO bus is not allowed to be written in interrupt |
523 | * context, so we need to disable the irq here. A work | |
524 | * queue will write the PHY to disable and clear the | |
525 | * interrupt, and then reenable the irq line. */ | |
526 | disable_irq_nosync(irq); | |
0ac49527 | 527 | atomic_inc(&phydev->irq_disable); |
e1393456 AF |
528 | |
529 | schedule_work(&phydev->phy_queue); | |
530 | ||
531 | return IRQ_HANDLED; | |
532 | } | |
533 | ||
b3df0da8 RD |
534 | /** |
535 | * phy_enable_interrupts - Enable the interrupts from the PHY side | |
536 | * @phydev: target phy_device struct | |
537 | */ | |
89ff05ec | 538 | static int phy_enable_interrupts(struct phy_device *phydev) |
00db8189 AF |
539 | { |
540 | int err; | |
541 | ||
e1393456 | 542 | err = phy_clear_interrupt(phydev); |
00db8189 | 543 | |
e1393456 AF |
544 | if (err < 0) |
545 | return err; | |
00db8189 | 546 | |
e1393456 | 547 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); |
00db8189 AF |
548 | |
549 | return err; | |
550 | } | |
00db8189 | 551 | |
b3df0da8 RD |
552 | /** |
553 | * phy_disable_interrupts - Disable the PHY interrupts from the PHY side | |
554 | * @phydev: target phy_device struct | |
555 | */ | |
89ff05ec | 556 | static int phy_disable_interrupts(struct phy_device *phydev) |
00db8189 AF |
557 | { |
558 | int err; | |
559 | ||
560 | /* Disable PHY interrupts */ | |
561 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
562 | ||
563 | if (err) | |
564 | goto phy_err; | |
565 | ||
566 | /* Clear the interrupt */ | |
567 | err = phy_clear_interrupt(phydev); | |
568 | ||
569 | if (err) | |
570 | goto phy_err; | |
571 | ||
572 | return 0; | |
573 | ||
574 | phy_err: | |
575 | phy_error(phydev); | |
576 | ||
577 | return err; | |
578 | } | |
e1393456 | 579 | |
b3df0da8 RD |
580 | /** |
581 | * phy_start_interrupts - request and enable interrupts for a PHY device | |
582 | * @phydev: target phy_device struct | |
e1393456 | 583 | * |
b3df0da8 RD |
584 | * Description: Request the interrupt for the given PHY. |
585 | * If this fails, then we set irq to PHY_POLL. | |
e1393456 | 586 | * Otherwise, we enable the interrupts in the PHY. |
e1393456 | 587 | * This should only be called with a valid IRQ number. |
b3df0da8 | 588 | * Returns 0 on success or < 0 on error. |
e1393456 AF |
589 | */ |
590 | int phy_start_interrupts(struct phy_device *phydev) | |
591 | { | |
592 | int err = 0; | |
593 | ||
c4028958 | 594 | INIT_WORK(&phydev->phy_queue, phy_change); |
e1393456 | 595 | |
0ac49527 | 596 | atomic_set(&phydev->irq_disable, 0); |
e1393456 | 597 | if (request_irq(phydev->irq, phy_interrupt, |
1fb9df5d | 598 | IRQF_SHARED, |
e1393456 AF |
599 | "phy_interrupt", |
600 | phydev) < 0) { | |
8d242488 JP |
601 | pr_warn("%s: Can't get IRQ %d (PHY)\n", |
602 | phydev->bus->name, phydev->irq); | |
e1393456 AF |
603 | phydev->irq = PHY_POLL; |
604 | return 0; | |
605 | } | |
606 | ||
607 | err = phy_enable_interrupts(phydev); | |
608 | ||
609 | return err; | |
610 | } | |
611 | EXPORT_SYMBOL(phy_start_interrupts); | |
612 | ||
b3df0da8 RD |
613 | /** |
614 | * phy_stop_interrupts - disable interrupts from a PHY device | |
615 | * @phydev: target phy_device struct | |
616 | */ | |
e1393456 AF |
617 | int phy_stop_interrupts(struct phy_device *phydev) |
618 | { | |
619 | int err; | |
620 | ||
621 | err = phy_disable_interrupts(phydev); | |
622 | ||
623 | if (err) | |
624 | phy_error(phydev); | |
625 | ||
0ac49527 MR |
626 | free_irq(phydev->irq, phydev); |
627 | ||
3c3070d7 | 628 | /* |
0ac49527 MR |
629 | * Cannot call flush_scheduled_work() here as desired because |
630 | * of rtnl_lock(), but we do not really care about what would | |
631 | * be done, except from enable_irq(), so cancel any work | |
632 | * possibly pending and take care of the matter below. | |
3c3070d7 | 633 | */ |
28e53bdd | 634 | cancel_work_sync(&phydev->phy_queue); |
0ac49527 MR |
635 | /* |
636 | * If work indeed has been cancelled, disable_irq() will have | |
637 | * been left unbalanced from phy_interrupt() and enable_irq() | |
638 | * has to be called so that other devices on the line work. | |
639 | */ | |
640 | while (atomic_dec_return(&phydev->irq_disable) >= 0) | |
641 | enable_irq(phydev->irq); | |
e1393456 AF |
642 | |
643 | return err; | |
644 | } | |
645 | EXPORT_SYMBOL(phy_stop_interrupts); | |
646 | ||
647 | ||
b3df0da8 RD |
648 | /** |
649 | * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes | |
650 | * @work: work_struct that describes the work to be done | |
651 | */ | |
c4028958 | 652 | static void phy_change(struct work_struct *work) |
e1393456 AF |
653 | { |
654 | int err; | |
c4028958 DH |
655 | struct phy_device *phydev = |
656 | container_of(work, struct phy_device, phy_queue); | |
e1393456 | 657 | |
a8729eb3 AG |
658 | if (phydev->drv->did_interrupt && |
659 | !phydev->drv->did_interrupt(phydev)) | |
660 | goto ignore; | |
661 | ||
e1393456 AF |
662 | err = phy_disable_interrupts(phydev); |
663 | ||
664 | if (err) | |
665 | goto phy_err; | |
666 | ||
35b5f6b1 | 667 | mutex_lock(&phydev->lock); |
e1393456 AF |
668 | if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state)) |
669 | phydev->state = PHY_CHANGELINK; | |
35b5f6b1 | 670 | mutex_unlock(&phydev->lock); |
e1393456 | 671 | |
0ac49527 | 672 | atomic_dec(&phydev->irq_disable); |
e1393456 AF |
673 | enable_irq(phydev->irq); |
674 | ||
675 | /* Reenable interrupts */ | |
3c3070d7 MR |
676 | if (PHY_HALTED != phydev->state) |
677 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); | |
e1393456 AF |
678 | |
679 | if (err) | |
680 | goto irq_enable_err; | |
681 | ||
a390d1f3 MS |
682 | /* reschedule state queue work to run as soon as possible */ |
683 | cancel_delayed_work_sync(&phydev->state_queue); | |
684 | schedule_delayed_work(&phydev->state_queue, 0); | |
0acb2839 | 685 | |
e1393456 AF |
686 | return; |
687 | ||
a8729eb3 AG |
688 | ignore: |
689 | atomic_dec(&phydev->irq_disable); | |
690 | enable_irq(phydev->irq); | |
691 | return; | |
692 | ||
e1393456 AF |
693 | irq_enable_err: |
694 | disable_irq(phydev->irq); | |
0ac49527 | 695 | atomic_inc(&phydev->irq_disable); |
e1393456 AF |
696 | phy_err: |
697 | phy_error(phydev); | |
698 | } | |
699 | ||
b3df0da8 RD |
700 | /** |
701 | * phy_stop - Bring down the PHY link, and stop checking the status | |
702 | * @phydev: target phy_device struct | |
703 | */ | |
e1393456 AF |
704 | void phy_stop(struct phy_device *phydev) |
705 | { | |
35b5f6b1 | 706 | mutex_lock(&phydev->lock); |
e1393456 AF |
707 | |
708 | if (PHY_HALTED == phydev->state) | |
709 | goto out_unlock; | |
710 | ||
3c3070d7 | 711 | if (phydev->irq != PHY_POLL) { |
e1393456 AF |
712 | /* Disable PHY Interrupts */ |
713 | phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
e1393456 | 714 | |
3c3070d7 MR |
715 | /* Clear any pending interrupts */ |
716 | phy_clear_interrupt(phydev); | |
717 | } | |
e1393456 | 718 | |
6daf6531 MR |
719 | phydev->state = PHY_HALTED; |
720 | ||
e1393456 | 721 | out_unlock: |
35b5f6b1 | 722 | mutex_unlock(&phydev->lock); |
3c3070d7 MR |
723 | |
724 | /* | |
725 | * Cannot call flush_scheduled_work() here as desired because | |
726 | * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change() | |
727 | * will not reenable interrupts. | |
728 | */ | |
e1393456 AF |
729 | } |
730 | ||
731 | ||
b3df0da8 RD |
732 | /** |
733 | * phy_start - start or restart a PHY device | |
734 | * @phydev: target phy_device struct | |
e1393456 | 735 | * |
b3df0da8 | 736 | * Description: Indicates the attached device's readiness to |
e1393456 AF |
737 | * handle PHY-related work. Used during startup to start the |
738 | * PHY, and after a call to phy_stop() to resume operation. | |
739 | * Also used to indicate the MDIO bus has cleared an error | |
740 | * condition. | |
741 | */ | |
742 | void phy_start(struct phy_device *phydev) | |
743 | { | |
35b5f6b1 | 744 | mutex_lock(&phydev->lock); |
e1393456 AF |
745 | |
746 | switch (phydev->state) { | |
747 | case PHY_STARTING: | |
748 | phydev->state = PHY_PENDING; | |
749 | break; | |
750 | case PHY_READY: | |
751 | phydev->state = PHY_UP; | |
752 | break; | |
753 | case PHY_HALTED: | |
754 | phydev->state = PHY_RESUMING; | |
755 | default: | |
756 | break; | |
757 | } | |
35b5f6b1 | 758 | mutex_unlock(&phydev->lock); |
e1393456 AF |
759 | } |
760 | EXPORT_SYMBOL(phy_stop); | |
761 | EXPORT_SYMBOL(phy_start); | |
67c4f3fa | 762 | |
35b5f6b1 NC |
763 | /** |
764 | * phy_state_machine - Handle the state machine | |
765 | * @work: work_struct that describes the work to be done | |
35b5f6b1 | 766 | */ |
4f9c85a1 | 767 | void phy_state_machine(struct work_struct *work) |
00db8189 | 768 | { |
bf6aede7 | 769 | struct delayed_work *dwork = to_delayed_work(work); |
35b5f6b1 | 770 | struct phy_device *phydev = |
a390d1f3 | 771 | container_of(dwork, struct phy_device, state_queue); |
00db8189 AF |
772 | int needs_aneg = 0; |
773 | int err = 0; | |
774 | ||
35b5f6b1 | 775 | mutex_lock(&phydev->lock); |
00db8189 AF |
776 | |
777 | if (phydev->adjust_state) | |
778 | phydev->adjust_state(phydev->attached_dev); | |
779 | ||
780 | switch(phydev->state) { | |
781 | case PHY_DOWN: | |
782 | case PHY_STARTING: | |
783 | case PHY_READY: | |
784 | case PHY_PENDING: | |
785 | break; | |
786 | case PHY_UP: | |
787 | needs_aneg = 1; | |
788 | ||
789 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
790 | ||
791 | break; | |
792 | case PHY_AN: | |
6b655529 AF |
793 | err = phy_read_status(phydev); |
794 | ||
795 | if (err < 0) | |
796 | break; | |
797 | ||
798 | /* If the link is down, give up on | |
799 | * negotiation for now */ | |
800 | if (!phydev->link) { | |
801 | phydev->state = PHY_NOLINK; | |
802 | netif_carrier_off(phydev->attached_dev); | |
803 | phydev->adjust_link(phydev->attached_dev); | |
804 | break; | |
805 | } | |
806 | ||
00db8189 AF |
807 | /* Check if negotiation is done. Break |
808 | * if there's an error */ | |
809 | err = phy_aneg_done(phydev); | |
810 | if (err < 0) | |
811 | break; | |
812 | ||
6b655529 | 813 | /* If AN is done, we're running */ |
00db8189 | 814 | if (err > 0) { |
6b655529 AF |
815 | phydev->state = PHY_RUNNING; |
816 | netif_carrier_on(phydev->attached_dev); | |
817 | phydev->adjust_link(phydev->attached_dev); | |
00db8189 | 818 | |
6b655529 AF |
819 | } else if (0 == phydev->link_timeout--) { |
820 | int idx; | |
00db8189 | 821 | |
6b655529 AF |
822 | needs_aneg = 1; |
823 | /* If we have the magic_aneg bit, | |
824 | * we try again */ | |
825 | if (phydev->drv->flags & PHY_HAS_MAGICANEG) | |
00db8189 AF |
826 | break; |
827 | ||
6b655529 AF |
828 | /* The timer expired, and we still |
829 | * don't have a setting, so we try | |
830 | * forcing it until we find one that | |
831 | * works, starting from the fastest speed, | |
832 | * and working our way down */ | |
833 | idx = phy_find_valid(0, phydev->supported); | |
00db8189 | 834 | |
6b655529 AF |
835 | phydev->speed = settings[idx].speed; |
836 | phydev->duplex = settings[idx].duplex; | |
00db8189 | 837 | |
6b655529 | 838 | phydev->autoneg = AUTONEG_DISABLE; |
00db8189 | 839 | |
8d242488 JP |
840 | pr_info("Trying %d/%s\n", |
841 | phydev->speed, | |
842 | DUPLEX_FULL == phydev->duplex ? | |
843 | "FULL" : "HALF"); | |
00db8189 AF |
844 | } |
845 | break; | |
846 | case PHY_NOLINK: | |
847 | err = phy_read_status(phydev); | |
848 | ||
849 | if (err) | |
850 | break; | |
851 | ||
852 | if (phydev->link) { | |
853 | phydev->state = PHY_RUNNING; | |
854 | netif_carrier_on(phydev->attached_dev); | |
855 | phydev->adjust_link(phydev->attached_dev); | |
856 | } | |
857 | break; | |
858 | case PHY_FORCING: | |
6b655529 | 859 | err = genphy_update_link(phydev); |
00db8189 AF |
860 | |
861 | if (err) | |
862 | break; | |
863 | ||
864 | if (phydev->link) { | |
865 | phydev->state = PHY_RUNNING; | |
866 | netif_carrier_on(phydev->attached_dev); | |
867 | } else { | |
868 | if (0 == phydev->link_timeout--) { | |
869 | phy_force_reduction(phydev); | |
870 | needs_aneg = 1; | |
871 | } | |
872 | } | |
873 | ||
874 | phydev->adjust_link(phydev->attached_dev); | |
875 | break; | |
876 | case PHY_RUNNING: | |
877 | /* Only register a CHANGE if we are | |
878 | * polling */ | |
879 | if (PHY_POLL == phydev->irq) | |
880 | phydev->state = PHY_CHANGELINK; | |
881 | break; | |
882 | case PHY_CHANGELINK: | |
883 | err = phy_read_status(phydev); | |
884 | ||
885 | if (err) | |
886 | break; | |
887 | ||
888 | if (phydev->link) { | |
889 | phydev->state = PHY_RUNNING; | |
890 | netif_carrier_on(phydev->attached_dev); | |
891 | } else { | |
892 | phydev->state = PHY_NOLINK; | |
893 | netif_carrier_off(phydev->attached_dev); | |
894 | } | |
895 | ||
896 | phydev->adjust_link(phydev->attached_dev); | |
897 | ||
898 | if (PHY_POLL != phydev->irq) | |
899 | err = phy_config_interrupt(phydev, | |
900 | PHY_INTERRUPT_ENABLED); | |
901 | break; | |
902 | case PHY_HALTED: | |
903 | if (phydev->link) { | |
904 | phydev->link = 0; | |
905 | netif_carrier_off(phydev->attached_dev); | |
906 | phydev->adjust_link(phydev->attached_dev); | |
907 | } | |
908 | break; | |
909 | case PHY_RESUMING: | |
910 | ||
911 | err = phy_clear_interrupt(phydev); | |
912 | ||
913 | if (err) | |
914 | break; | |
915 | ||
916 | err = phy_config_interrupt(phydev, | |
917 | PHY_INTERRUPT_ENABLED); | |
918 | ||
919 | if (err) | |
920 | break; | |
921 | ||
922 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
923 | err = phy_aneg_done(phydev); | |
924 | if (err < 0) | |
925 | break; | |
926 | ||
927 | /* err > 0 if AN is done. | |
928 | * Otherwise, it's 0, and we're | |
929 | * still waiting for AN */ | |
930 | if (err > 0) { | |
42caa074 WF |
931 | err = phy_read_status(phydev); |
932 | if (err) | |
933 | break; | |
934 | ||
935 | if (phydev->link) { | |
936 | phydev->state = PHY_RUNNING; | |
937 | netif_carrier_on(phydev->attached_dev); | |
938 | } else | |
939 | phydev->state = PHY_NOLINK; | |
940 | phydev->adjust_link(phydev->attached_dev); | |
00db8189 AF |
941 | } else { |
942 | phydev->state = PHY_AN; | |
943 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
944 | } | |
42caa074 WF |
945 | } else { |
946 | err = phy_read_status(phydev); | |
947 | if (err) | |
948 | break; | |
949 | ||
950 | if (phydev->link) { | |
951 | phydev->state = PHY_RUNNING; | |
952 | netif_carrier_on(phydev->attached_dev); | |
953 | } else | |
954 | phydev->state = PHY_NOLINK; | |
955 | phydev->adjust_link(phydev->attached_dev); | |
956 | } | |
00db8189 AF |
957 | break; |
958 | } | |
959 | ||
35b5f6b1 | 960 | mutex_unlock(&phydev->lock); |
00db8189 AF |
961 | |
962 | if (needs_aneg) | |
963 | err = phy_start_aneg(phydev); | |
964 | ||
965 | if (err < 0) | |
966 | phy_error(phydev); | |
967 | ||
3664090e | 968 | schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ); |
35b5f6b1 | 969 | } |