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 | */ | |
00db8189 | 18 | #include <linux/kernel.h> |
00db8189 AF |
19 | #include <linux/string.h> |
20 | #include <linux/errno.h> | |
21 | #include <linux/unistd.h> | |
00db8189 AF |
22 | #include <linux/interrupt.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/skbuff.h> | |
00db8189 AF |
28 | #include <linux/mm.h> |
29 | #include <linux/module.h> | |
00db8189 AF |
30 | #include <linux/mii.h> |
31 | #include <linux/ethtool.h> | |
32 | #include <linux/phy.h> | |
3c3070d7 MR |
33 | #include <linux/timer.h> |
34 | #include <linux/workqueue.h> | |
00db8189 | 35 | |
0ac49527 | 36 | #include <asm/atomic.h> |
00db8189 AF |
37 | #include <asm/io.h> |
38 | #include <asm/irq.h> | |
39 | #include <asm/uaccess.h> | |
40 | ||
b3df0da8 RD |
41 | /** |
42 | * phy_print_status - Convenience function to print out the current phy status | |
43 | * @phydev: the phy_device struct | |
e1393456 AF |
44 | */ |
45 | void phy_print_status(struct phy_device *phydev) | |
46 | { | |
fb28ad35 | 47 | pr_info("PHY: %s - Link is %s", dev_name(&phydev->dev), |
e1393456 AF |
48 | phydev->link ? "Up" : "Down"); |
49 | if (phydev->link) | |
a40c9f88 | 50 | printk(KERN_CONT " - %d/%s", phydev->speed, |
e1393456 AF |
51 | DUPLEX_FULL == phydev->duplex ? |
52 | "Full" : "Half"); | |
53 | ||
a40c9f88 | 54 | printk(KERN_CONT "\n"); |
e1393456 AF |
55 | } |
56 | EXPORT_SYMBOL(phy_print_status); | |
00db8189 AF |
57 | |
58 | ||
b3df0da8 RD |
59 | /** |
60 | * phy_clear_interrupt - Ack the phy device's interrupt | |
61 | * @phydev: the phy_device struct | |
62 | * | |
63 | * If the @phydev driver has an ack_interrupt function, call it to | |
64 | * ack and clear the phy device's interrupt. | |
65 | * | |
66 | * Returns 0 on success on < 0 on error. | |
67 | */ | |
89ff05ec | 68 | static int phy_clear_interrupt(struct phy_device *phydev) |
00db8189 AF |
69 | { |
70 | int err = 0; | |
71 | ||
72 | if (phydev->drv->ack_interrupt) | |
73 | err = phydev->drv->ack_interrupt(phydev); | |
74 | ||
75 | return err; | |
76 | } | |
77 | ||
b3df0da8 RD |
78 | /** |
79 | * phy_config_interrupt - configure the PHY device for the requested interrupts | |
80 | * @phydev: the phy_device struct | |
81 | * @interrupts: interrupt flags to configure for this @phydev | |
82 | * | |
83 | * Returns 0 on success on < 0 on error. | |
84 | */ | |
89ff05ec | 85 | static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts) |
00db8189 AF |
86 | { |
87 | int err = 0; | |
88 | ||
89 | phydev->interrupts = interrupts; | |
90 | if (phydev->drv->config_intr) | |
91 | err = phydev->drv->config_intr(phydev); | |
92 | ||
93 | return err; | |
94 | } | |
95 | ||
96 | ||
b3df0da8 RD |
97 | /** |
98 | * phy_aneg_done - return auto-negotiation status | |
99 | * @phydev: target phy_device struct | |
00db8189 | 100 | * |
b3df0da8 | 101 | * Description: Reads the status register and returns 0 either if |
00db8189 AF |
102 | * auto-negotiation is incomplete, or if there was an error. |
103 | * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. | |
104 | */ | |
105 | static inline int phy_aneg_done(struct phy_device *phydev) | |
106 | { | |
107 | int retval; | |
108 | ||
109 | retval = phy_read(phydev, MII_BMSR); | |
110 | ||
111 | return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); | |
112 | } | |
113 | ||
00db8189 AF |
114 | /* A structure for mapping a particular speed and duplex |
115 | * combination to a particular SUPPORTED and ADVERTISED value */ | |
116 | struct phy_setting { | |
117 | int speed; | |
118 | int duplex; | |
119 | u32 setting; | |
120 | }; | |
121 | ||
122 | /* A mapping of all SUPPORTED settings to speed/duplex */ | |
f71e1309 | 123 | static const struct phy_setting settings[] = { |
00db8189 AF |
124 | { |
125 | .speed = 10000, | |
126 | .duplex = DUPLEX_FULL, | |
127 | .setting = SUPPORTED_10000baseT_Full, | |
128 | }, | |
129 | { | |
130 | .speed = SPEED_1000, | |
131 | .duplex = DUPLEX_FULL, | |
132 | .setting = SUPPORTED_1000baseT_Full, | |
133 | }, | |
134 | { | |
135 | .speed = SPEED_1000, | |
136 | .duplex = DUPLEX_HALF, | |
137 | .setting = SUPPORTED_1000baseT_Half, | |
138 | }, | |
139 | { | |
140 | .speed = SPEED_100, | |
141 | .duplex = DUPLEX_FULL, | |
142 | .setting = SUPPORTED_100baseT_Full, | |
143 | }, | |
144 | { | |
145 | .speed = SPEED_100, | |
146 | .duplex = DUPLEX_HALF, | |
147 | .setting = SUPPORTED_100baseT_Half, | |
148 | }, | |
149 | { | |
150 | .speed = SPEED_10, | |
151 | .duplex = DUPLEX_FULL, | |
152 | .setting = SUPPORTED_10baseT_Full, | |
153 | }, | |
154 | { | |
155 | .speed = SPEED_10, | |
156 | .duplex = DUPLEX_HALF, | |
157 | .setting = SUPPORTED_10baseT_Half, | |
158 | }, | |
159 | }; | |
160 | ||
ff8ac609 | 161 | #define MAX_NUM_SETTINGS ARRAY_SIZE(settings) |
00db8189 | 162 | |
b3df0da8 RD |
163 | /** |
164 | * phy_find_setting - find a PHY settings array entry that matches speed & duplex | |
165 | * @speed: speed to match | |
166 | * @duplex: duplex to match | |
00db8189 | 167 | * |
b3df0da8 | 168 | * Description: Searches the settings array for the setting which |
00db8189 AF |
169 | * matches the desired speed and duplex, and returns the index |
170 | * of that setting. Returns the index of the last setting if | |
171 | * none of the others match. | |
172 | */ | |
173 | static inline int phy_find_setting(int speed, int duplex) | |
174 | { | |
175 | int idx = 0; | |
176 | ||
177 | while (idx < ARRAY_SIZE(settings) && | |
178 | (settings[idx].speed != speed || | |
179 | settings[idx].duplex != duplex)) | |
180 | idx++; | |
181 | ||
182 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; | |
183 | } | |
184 | ||
b3df0da8 RD |
185 | /** |
186 | * phy_find_valid - find a PHY setting that matches the requested features mask | |
187 | * @idx: The first index in settings[] to search | |
188 | * @features: A mask of the valid settings | |
00db8189 | 189 | * |
b3df0da8 | 190 | * Description: Returns the index of the first valid setting less |
00db8189 AF |
191 | * than or equal to the one pointed to by idx, as determined by |
192 | * the mask in features. Returns the index of the last setting | |
193 | * if nothing else matches. | |
194 | */ | |
195 | static inline int phy_find_valid(int idx, u32 features) | |
196 | { | |
197 | while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features)) | |
198 | idx++; | |
199 | ||
200 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; | |
201 | } | |
202 | ||
b3df0da8 RD |
203 | /** |
204 | * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex | |
205 | * @phydev: the target phy_device struct | |
00db8189 | 206 | * |
b3df0da8 | 207 | * Description: Make sure the PHY is set to supported speeds and |
00db8189 | 208 | * duplexes. Drop down by one in this order: 1000/FULL, |
b3df0da8 | 209 | * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. |
00db8189 | 210 | */ |
89ff05ec | 211 | static void phy_sanitize_settings(struct phy_device *phydev) |
00db8189 AF |
212 | { |
213 | u32 features = phydev->supported; | |
214 | int idx; | |
215 | ||
216 | /* Sanitize settings based on PHY capabilities */ | |
217 | if ((features & SUPPORTED_Autoneg) == 0) | |
163642a2 | 218 | phydev->autoneg = AUTONEG_DISABLE; |
00db8189 AF |
219 | |
220 | idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex), | |
221 | features); | |
222 | ||
223 | phydev->speed = settings[idx].speed; | |
224 | phydev->duplex = settings[idx].duplex; | |
225 | } | |
00db8189 | 226 | |
b3df0da8 RD |
227 | /** |
228 | * phy_ethtool_sset - generic ethtool sset function, handles all the details | |
229 | * @phydev: target phy_device struct | |
230 | * @cmd: ethtool_cmd | |
00db8189 AF |
231 | * |
232 | * A few notes about parameter checking: | |
233 | * - We don't set port or transceiver, so we don't care what they | |
234 | * were set to. | |
235 | * - phy_start_aneg() will make sure forced settings are sane, and | |
236 | * choose the next best ones from the ones selected, so we don't | |
b3df0da8 | 237 | * care if ethtool tries to give us bad values. |
00db8189 AF |
238 | */ |
239 | int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
240 | { | |
241 | if (cmd->phy_address != phydev->addr) | |
242 | return -EINVAL; | |
243 | ||
244 | /* We make sure that we don't pass unsupported | |
245 | * values in to the PHY */ | |
246 | cmd->advertising &= phydev->supported; | |
247 | ||
248 | /* Verify the settings we care about. */ | |
249 | if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) | |
250 | return -EINVAL; | |
251 | ||
252 | if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) | |
253 | return -EINVAL; | |
254 | ||
8e95a202 JP |
255 | if (cmd->autoneg == AUTONEG_DISABLE && |
256 | ((cmd->speed != SPEED_1000 && | |
257 | cmd->speed != SPEED_100 && | |
258 | cmd->speed != SPEED_10) || | |
259 | (cmd->duplex != DUPLEX_HALF && | |
260 | cmd->duplex != DUPLEX_FULL))) | |
00db8189 AF |
261 | return -EINVAL; |
262 | ||
263 | phydev->autoneg = cmd->autoneg; | |
264 | ||
265 | phydev->speed = cmd->speed; | |
266 | ||
267 | phydev->advertising = cmd->advertising; | |
268 | ||
269 | if (AUTONEG_ENABLE == cmd->autoneg) | |
270 | phydev->advertising |= ADVERTISED_Autoneg; | |
271 | else | |
272 | phydev->advertising &= ~ADVERTISED_Autoneg; | |
273 | ||
274 | phydev->duplex = cmd->duplex; | |
275 | ||
276 | /* Restart the PHY */ | |
277 | phy_start_aneg(phydev); | |
278 | ||
279 | return 0; | |
280 | } | |
9f6d55d0 | 281 | EXPORT_SYMBOL(phy_ethtool_sset); |
00db8189 AF |
282 | |
283 | int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
284 | { | |
285 | cmd->supported = phydev->supported; | |
286 | ||
287 | cmd->advertising = phydev->advertising; | |
288 | ||
289 | cmd->speed = phydev->speed; | |
290 | cmd->duplex = phydev->duplex; | |
291 | cmd->port = PORT_MII; | |
292 | cmd->phy_address = phydev->addr; | |
293 | cmd->transceiver = XCVR_EXTERNAL; | |
294 | cmd->autoneg = phydev->autoneg; | |
295 | ||
296 | return 0; | |
297 | } | |
9f6d55d0 | 298 | EXPORT_SYMBOL(phy_ethtool_gset); |
00db8189 | 299 | |
b3df0da8 RD |
300 | /** |
301 | * phy_mii_ioctl - generic PHY MII ioctl interface | |
302 | * @phydev: the phy_device struct | |
00c7d920 | 303 | * @ifr: &struct ifreq for socket ioctl's |
b3df0da8 RD |
304 | * @cmd: ioctl cmd to execute |
305 | * | |
306 | * Note that this function is currently incompatible with the | |
00db8189 | 307 | * PHYCONTROL layer. It changes registers without regard to |
b3df0da8 | 308 | * current state. Use at own risk. |
00db8189 AF |
309 | */ |
310 | int phy_mii_ioctl(struct phy_device *phydev, | |
28b04113 | 311 | struct ifreq *ifr, int cmd) |
00db8189 | 312 | { |
28b04113 | 313 | struct mii_ioctl_data *mii_data = if_mii(ifr); |
00db8189 AF |
314 | u16 val = mii_data->val_in; |
315 | ||
316 | switch (cmd) { | |
317 | case SIOCGMIIPHY: | |
318 | mii_data->phy_id = phydev->addr; | |
c6d6a511 LB |
319 | /* fall through */ |
320 | ||
00db8189 | 321 | case SIOCGMIIREG: |
af1dc13e PK |
322 | mii_data->val_out = mdiobus_read(phydev->bus, mii_data->phy_id, |
323 | mii_data->reg_num); | |
00db8189 AF |
324 | break; |
325 | ||
326 | case SIOCSMIIREG: | |
00db8189 AF |
327 | if (mii_data->phy_id == phydev->addr) { |
328 | switch(mii_data->reg_num) { | |
329 | case MII_BMCR: | |
163642a2 | 330 | if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0) |
00db8189 AF |
331 | phydev->autoneg = AUTONEG_DISABLE; |
332 | else | |
333 | phydev->autoneg = AUTONEG_ENABLE; | |
334 | if ((!phydev->autoneg) && (val & BMCR_FULLDPLX)) | |
335 | phydev->duplex = DUPLEX_FULL; | |
336 | else | |
337 | phydev->duplex = DUPLEX_HALF; | |
024a0a3c SL |
338 | if ((!phydev->autoneg) && |
339 | (val & BMCR_SPEED1000)) | |
340 | phydev->speed = SPEED_1000; | |
341 | else if ((!phydev->autoneg) && | |
342 | (val & BMCR_SPEED100)) | |
343 | phydev->speed = SPEED_100; | |
00db8189 AF |
344 | break; |
345 | case MII_ADVERTISE: | |
346 | phydev->advertising = val; | |
347 | break; | |
348 | default: | |
349 | /* do nothing */ | |
350 | break; | |
351 | } | |
352 | } | |
353 | ||
af1dc13e PK |
354 | mdiobus_write(phydev->bus, mii_data->phy_id, |
355 | mii_data->reg_num, val); | |
356 | ||
8e95a202 JP |
357 | if (mii_data->reg_num == MII_BMCR && |
358 | val & BMCR_RESET && | |
359 | phydev->drv->config_init) { | |
f62220d3 | 360 | phy_scan_fixups(phydev); |
00db8189 | 361 | phydev->drv->config_init(phydev); |
f62220d3 | 362 | } |
00db8189 | 363 | break; |
dda93b48 | 364 | |
c1f19b51 RC |
365 | case SIOCSHWTSTAMP: |
366 | if (phydev->drv->hwtstamp) | |
367 | return phydev->drv->hwtstamp(phydev, ifr); | |
368 | /* fall through */ | |
369 | ||
dda93b48 | 370 | default: |
c6d6a511 | 371 | return -EOPNOTSUPP; |
00db8189 AF |
372 | } |
373 | ||
374 | return 0; | |
375 | } | |
680e9fe9 | 376 | EXPORT_SYMBOL(phy_mii_ioctl); |
00db8189 | 377 | |
b3df0da8 RD |
378 | /** |
379 | * phy_start_aneg - start auto-negotiation for this PHY device | |
380 | * @phydev: the phy_device struct | |
e1393456 | 381 | * |
b3df0da8 RD |
382 | * Description: Sanitizes the settings (if we're not autonegotiating |
383 | * them), and then calls the driver's config_aneg function. | |
384 | * If the PHYCONTROL Layer is operating, we change the state to | |
385 | * reflect the beginning of Auto-negotiation or forcing. | |
e1393456 AF |
386 | */ |
387 | int phy_start_aneg(struct phy_device *phydev) | |
388 | { | |
389 | int err; | |
390 | ||
35b5f6b1 | 391 | mutex_lock(&phydev->lock); |
e1393456 AF |
392 | |
393 | if (AUTONEG_DISABLE == phydev->autoneg) | |
394 | phy_sanitize_settings(phydev); | |
395 | ||
396 | err = phydev->drv->config_aneg(phydev); | |
397 | ||
e1393456 AF |
398 | if (err < 0) |
399 | goto out_unlock; | |
400 | ||
401 | if (phydev->state != PHY_HALTED) { | |
402 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
403 | phydev->state = PHY_AN; | |
404 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
405 | } else { | |
406 | phydev->state = PHY_FORCING; | |
407 | phydev->link_timeout = PHY_FORCE_TIMEOUT; | |
408 | } | |
409 | } | |
410 | ||
411 | out_unlock: | |
35b5f6b1 | 412 | mutex_unlock(&phydev->lock); |
e1393456 AF |
413 | return err; |
414 | } | |
415 | EXPORT_SYMBOL(phy_start_aneg); | |
416 | ||
417 | ||
c4028958 | 418 | static void phy_change(struct work_struct *work); |
e1393456 | 419 | |
b3df0da8 RD |
420 | /** |
421 | * phy_start_machine - start PHY state machine tracking | |
422 | * @phydev: the phy_device struct | |
423 | * @handler: callback function for state change notifications | |
00db8189 | 424 | * |
b3df0da8 | 425 | * Description: The PHY infrastructure can run a state machine |
00db8189 AF |
426 | * which tracks whether the PHY is starting up, negotiating, |
427 | * etc. This function starts the timer which tracks the state | |
b3df0da8 RD |
428 | * of the PHY. If you want to be notified when the state changes, |
429 | * pass in the callback @handler, otherwise, pass NULL. If you | |
00db8189 | 430 | * want to maintain your own state machine, do not call this |
b3df0da8 RD |
431 | * function. |
432 | */ | |
00db8189 AF |
433 | void phy_start_machine(struct phy_device *phydev, |
434 | void (*handler)(struct net_device *)) | |
435 | { | |
436 | phydev->adjust_state = handler; | |
437 | ||
3664090e | 438 | schedule_delayed_work(&phydev->state_queue, HZ); |
00db8189 AF |
439 | } |
440 | ||
b3df0da8 RD |
441 | /** |
442 | * phy_stop_machine - stop the PHY state machine tracking | |
443 | * @phydev: target phy_device struct | |
00db8189 | 444 | * |
b3df0da8 | 445 | * Description: Stops the state machine timer, sets the state to UP |
817acf5e | 446 | * (unless it wasn't up yet). This function must be called BEFORE |
00db8189 AF |
447 | * phy_detach. |
448 | */ | |
449 | void phy_stop_machine(struct phy_device *phydev) | |
450 | { | |
a390d1f3 | 451 | cancel_delayed_work_sync(&phydev->state_queue); |
00db8189 | 452 | |
35b5f6b1 | 453 | mutex_lock(&phydev->lock); |
00db8189 AF |
454 | if (phydev->state > PHY_UP) |
455 | phydev->state = PHY_UP; | |
35b5f6b1 | 456 | mutex_unlock(&phydev->lock); |
00db8189 | 457 | |
00db8189 AF |
458 | phydev->adjust_state = NULL; |
459 | } | |
460 | ||
b3df0da8 RD |
461 | /** |
462 | * phy_force_reduction - reduce PHY speed/duplex settings by one step | |
463 | * @phydev: target phy_device struct | |
e1393456 | 464 | * |
b3df0da8 RD |
465 | * Description: Reduces the speed/duplex settings by one notch, |
466 | * in this order-- | |
467 | * 1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. | |
468 | * The function bottoms out at 10/HALF. | |
e1393456 AF |
469 | */ |
470 | static void phy_force_reduction(struct phy_device *phydev) | |
471 | { | |
472 | int idx; | |
473 | ||
474 | idx = phy_find_setting(phydev->speed, phydev->duplex); | |
475 | ||
476 | idx++; | |
477 | ||
478 | idx = phy_find_valid(idx, phydev->supported); | |
479 | ||
480 | phydev->speed = settings[idx].speed; | |
481 | phydev->duplex = settings[idx].duplex; | |
482 | ||
483 | pr_info("Trying %d/%s\n", phydev->speed, | |
484 | DUPLEX_FULL == phydev->duplex ? | |
485 | "FULL" : "HALF"); | |
486 | } | |
487 | ||
488 | ||
b3df0da8 RD |
489 | /** |
490 | * phy_error - enter HALTED state for this PHY device | |
491 | * @phydev: target phy_device struct | |
00db8189 AF |
492 | * |
493 | * Moves the PHY to the HALTED state in response to a read | |
494 | * or write error, and tells the controller the link is down. | |
495 | * Must not be called from interrupt context, or while the | |
496 | * phydev->lock is held. | |
497 | */ | |
9b9a8bfc | 498 | static void phy_error(struct phy_device *phydev) |
00db8189 | 499 | { |
35b5f6b1 | 500 | mutex_lock(&phydev->lock); |
00db8189 | 501 | phydev->state = PHY_HALTED; |
35b5f6b1 | 502 | mutex_unlock(&phydev->lock); |
00db8189 AF |
503 | } |
504 | ||
b3df0da8 RD |
505 | /** |
506 | * phy_interrupt - PHY interrupt handler | |
507 | * @irq: interrupt line | |
508 | * @phy_dat: phy_device pointer | |
e1393456 | 509 | * |
b3df0da8 | 510 | * Description: When a PHY interrupt occurs, the handler disables |
e1393456 AF |
511 | * interrupts, and schedules a work task to clear the interrupt. |
512 | */ | |
7d12e780 | 513 | static irqreturn_t phy_interrupt(int irq, void *phy_dat) |
e1393456 AF |
514 | { |
515 | struct phy_device *phydev = phy_dat; | |
516 | ||
3c3070d7 MR |
517 | if (PHY_HALTED == phydev->state) |
518 | return IRQ_NONE; /* It can't be ours. */ | |
519 | ||
e1393456 AF |
520 | /* The MDIO bus is not allowed to be written in interrupt |
521 | * context, so we need to disable the irq here. A work | |
522 | * queue will write the PHY to disable and clear the | |
523 | * interrupt, and then reenable the irq line. */ | |
524 | disable_irq_nosync(irq); | |
0ac49527 | 525 | atomic_inc(&phydev->irq_disable); |
e1393456 AF |
526 | |
527 | schedule_work(&phydev->phy_queue); | |
528 | ||
529 | return IRQ_HANDLED; | |
530 | } | |
531 | ||
b3df0da8 RD |
532 | /** |
533 | * phy_enable_interrupts - Enable the interrupts from the PHY side | |
534 | * @phydev: target phy_device struct | |
535 | */ | |
89ff05ec | 536 | static int phy_enable_interrupts(struct phy_device *phydev) |
00db8189 AF |
537 | { |
538 | int err; | |
539 | ||
e1393456 | 540 | err = phy_clear_interrupt(phydev); |
00db8189 | 541 | |
e1393456 AF |
542 | if (err < 0) |
543 | return err; | |
00db8189 | 544 | |
e1393456 | 545 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); |
00db8189 AF |
546 | |
547 | return err; | |
548 | } | |
00db8189 | 549 | |
b3df0da8 RD |
550 | /** |
551 | * phy_disable_interrupts - Disable the PHY interrupts from the PHY side | |
552 | * @phydev: target phy_device struct | |
553 | */ | |
89ff05ec | 554 | static int phy_disable_interrupts(struct phy_device *phydev) |
00db8189 AF |
555 | { |
556 | int err; | |
557 | ||
558 | /* Disable PHY interrupts */ | |
559 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
560 | ||
561 | if (err) | |
562 | goto phy_err; | |
563 | ||
564 | /* Clear the interrupt */ | |
565 | err = phy_clear_interrupt(phydev); | |
566 | ||
567 | if (err) | |
568 | goto phy_err; | |
569 | ||
570 | return 0; | |
571 | ||
572 | phy_err: | |
573 | phy_error(phydev); | |
574 | ||
575 | return err; | |
576 | } | |
e1393456 | 577 | |
b3df0da8 RD |
578 | /** |
579 | * phy_start_interrupts - request and enable interrupts for a PHY device | |
580 | * @phydev: target phy_device struct | |
e1393456 | 581 | * |
b3df0da8 RD |
582 | * Description: Request the interrupt for the given PHY. |
583 | * If this fails, then we set irq to PHY_POLL. | |
e1393456 | 584 | * Otherwise, we enable the interrupts in the PHY. |
e1393456 | 585 | * This should only be called with a valid IRQ number. |
b3df0da8 | 586 | * Returns 0 on success or < 0 on error. |
e1393456 AF |
587 | */ |
588 | int phy_start_interrupts(struct phy_device *phydev) | |
589 | { | |
590 | int err = 0; | |
591 | ||
c4028958 | 592 | INIT_WORK(&phydev->phy_queue, phy_change); |
e1393456 | 593 | |
0ac49527 | 594 | atomic_set(&phydev->irq_disable, 0); |
e1393456 | 595 | if (request_irq(phydev->irq, phy_interrupt, |
1fb9df5d | 596 | IRQF_SHARED, |
e1393456 AF |
597 | "phy_interrupt", |
598 | phydev) < 0) { | |
599 | printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n", | |
600 | phydev->bus->name, | |
601 | phydev->irq); | |
602 | phydev->irq = PHY_POLL; | |
603 | return 0; | |
604 | } | |
605 | ||
606 | err = phy_enable_interrupts(phydev); | |
607 | ||
608 | return err; | |
609 | } | |
610 | EXPORT_SYMBOL(phy_start_interrupts); | |
611 | ||
b3df0da8 RD |
612 | /** |
613 | * phy_stop_interrupts - disable interrupts from a PHY device | |
614 | * @phydev: target phy_device struct | |
615 | */ | |
e1393456 AF |
616 | int phy_stop_interrupts(struct phy_device *phydev) |
617 | { | |
618 | int err; | |
619 | ||
620 | err = phy_disable_interrupts(phydev); | |
621 | ||
622 | if (err) | |
623 | phy_error(phydev); | |
624 | ||
0ac49527 MR |
625 | free_irq(phydev->irq, phydev); |
626 | ||
3c3070d7 | 627 | /* |
0ac49527 MR |
628 | * Cannot call flush_scheduled_work() here as desired because |
629 | * of rtnl_lock(), but we do not really care about what would | |
630 | * be done, except from enable_irq(), so cancel any work | |
631 | * possibly pending and take care of the matter below. | |
3c3070d7 | 632 | */ |
28e53bdd | 633 | cancel_work_sync(&phydev->phy_queue); |
0ac49527 MR |
634 | /* |
635 | * If work indeed has been cancelled, disable_irq() will have | |
636 | * been left unbalanced from phy_interrupt() and enable_irq() | |
637 | * has to be called so that other devices on the line work. | |
638 | */ | |
639 | while (atomic_dec_return(&phydev->irq_disable) >= 0) | |
640 | enable_irq(phydev->irq); | |
e1393456 AF |
641 | |
642 | return err; | |
643 | } | |
644 | EXPORT_SYMBOL(phy_stop_interrupts); | |
645 | ||
646 | ||
b3df0da8 RD |
647 | /** |
648 | * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes | |
649 | * @work: work_struct that describes the work to be done | |
650 | */ | |
c4028958 | 651 | static void phy_change(struct work_struct *work) |
e1393456 AF |
652 | { |
653 | int err; | |
c4028958 DH |
654 | struct phy_device *phydev = |
655 | container_of(work, struct phy_device, phy_queue); | |
e1393456 | 656 | |
a8729eb3 AG |
657 | if (phydev->drv->did_interrupt && |
658 | !phydev->drv->did_interrupt(phydev)) | |
659 | goto ignore; | |
660 | ||
e1393456 AF |
661 | err = phy_disable_interrupts(phydev); |
662 | ||
663 | if (err) | |
664 | goto phy_err; | |
665 | ||
35b5f6b1 | 666 | mutex_lock(&phydev->lock); |
e1393456 AF |
667 | if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state)) |
668 | phydev->state = PHY_CHANGELINK; | |
35b5f6b1 | 669 | mutex_unlock(&phydev->lock); |
e1393456 | 670 | |
0ac49527 | 671 | atomic_dec(&phydev->irq_disable); |
e1393456 AF |
672 | enable_irq(phydev->irq); |
673 | ||
674 | /* Reenable interrupts */ | |
3c3070d7 MR |
675 | if (PHY_HALTED != phydev->state) |
676 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); | |
e1393456 AF |
677 | |
678 | if (err) | |
679 | goto irq_enable_err; | |
680 | ||
a390d1f3 MS |
681 | /* reschedule state queue work to run as soon as possible */ |
682 | cancel_delayed_work_sync(&phydev->state_queue); | |
683 | schedule_delayed_work(&phydev->state_queue, 0); | |
0acb2839 | 684 | |
e1393456 AF |
685 | return; |
686 | ||
a8729eb3 AG |
687 | ignore: |
688 | atomic_dec(&phydev->irq_disable); | |
689 | enable_irq(phydev->irq); | |
690 | return; | |
691 | ||
e1393456 AF |
692 | irq_enable_err: |
693 | disable_irq(phydev->irq); | |
0ac49527 | 694 | atomic_inc(&phydev->irq_disable); |
e1393456 AF |
695 | phy_err: |
696 | phy_error(phydev); | |
697 | } | |
698 | ||
b3df0da8 RD |
699 | /** |
700 | * phy_stop - Bring down the PHY link, and stop checking the status | |
701 | * @phydev: target phy_device struct | |
702 | */ | |
e1393456 AF |
703 | void phy_stop(struct phy_device *phydev) |
704 | { | |
35b5f6b1 | 705 | mutex_lock(&phydev->lock); |
e1393456 AF |
706 | |
707 | if (PHY_HALTED == phydev->state) | |
708 | goto out_unlock; | |
709 | ||
3c3070d7 | 710 | if (phydev->irq != PHY_POLL) { |
e1393456 AF |
711 | /* Disable PHY Interrupts */ |
712 | phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
e1393456 | 713 | |
3c3070d7 MR |
714 | /* Clear any pending interrupts */ |
715 | phy_clear_interrupt(phydev); | |
716 | } | |
e1393456 | 717 | |
6daf6531 MR |
718 | phydev->state = PHY_HALTED; |
719 | ||
e1393456 | 720 | out_unlock: |
35b5f6b1 | 721 | mutex_unlock(&phydev->lock); |
3c3070d7 MR |
722 | |
723 | /* | |
724 | * Cannot call flush_scheduled_work() here as desired because | |
725 | * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change() | |
726 | * will not reenable interrupts. | |
727 | */ | |
e1393456 AF |
728 | } |
729 | ||
730 | ||
b3df0da8 RD |
731 | /** |
732 | * phy_start - start or restart a PHY device | |
733 | * @phydev: target phy_device struct | |
e1393456 | 734 | * |
b3df0da8 | 735 | * Description: Indicates the attached device's readiness to |
e1393456 AF |
736 | * handle PHY-related work. Used during startup to start the |
737 | * PHY, and after a call to phy_stop() to resume operation. | |
738 | * Also used to indicate the MDIO bus has cleared an error | |
739 | * condition. | |
740 | */ | |
741 | void phy_start(struct phy_device *phydev) | |
742 | { | |
35b5f6b1 | 743 | mutex_lock(&phydev->lock); |
e1393456 AF |
744 | |
745 | switch (phydev->state) { | |
746 | case PHY_STARTING: | |
747 | phydev->state = PHY_PENDING; | |
748 | break; | |
749 | case PHY_READY: | |
750 | phydev->state = PHY_UP; | |
751 | break; | |
752 | case PHY_HALTED: | |
753 | phydev->state = PHY_RESUMING; | |
754 | default: | |
755 | break; | |
756 | } | |
35b5f6b1 | 757 | mutex_unlock(&phydev->lock); |
e1393456 AF |
758 | } |
759 | EXPORT_SYMBOL(phy_stop); | |
760 | EXPORT_SYMBOL(phy_start); | |
67c4f3fa | 761 | |
35b5f6b1 NC |
762 | /** |
763 | * phy_state_machine - Handle the state machine | |
764 | * @work: work_struct that describes the work to be done | |
35b5f6b1 | 765 | */ |
4f9c85a1 | 766 | void phy_state_machine(struct work_struct *work) |
00db8189 | 767 | { |
bf6aede7 | 768 | struct delayed_work *dwork = to_delayed_work(work); |
35b5f6b1 | 769 | struct phy_device *phydev = |
a390d1f3 | 770 | container_of(dwork, struct phy_device, state_queue); |
00db8189 AF |
771 | int needs_aneg = 0; |
772 | int err = 0; | |
773 | ||
35b5f6b1 | 774 | mutex_lock(&phydev->lock); |
00db8189 AF |
775 | |
776 | if (phydev->adjust_state) | |
777 | phydev->adjust_state(phydev->attached_dev); | |
778 | ||
779 | switch(phydev->state) { | |
780 | case PHY_DOWN: | |
781 | case PHY_STARTING: | |
782 | case PHY_READY: | |
783 | case PHY_PENDING: | |
784 | break; | |
785 | case PHY_UP: | |
786 | needs_aneg = 1; | |
787 | ||
788 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
789 | ||
790 | break; | |
791 | case PHY_AN: | |
6b655529 AF |
792 | err = phy_read_status(phydev); |
793 | ||
794 | if (err < 0) | |
795 | break; | |
796 | ||
797 | /* If the link is down, give up on | |
798 | * negotiation for now */ | |
799 | if (!phydev->link) { | |
800 | phydev->state = PHY_NOLINK; | |
801 | netif_carrier_off(phydev->attached_dev); | |
802 | phydev->adjust_link(phydev->attached_dev); | |
803 | break; | |
804 | } | |
805 | ||
00db8189 AF |
806 | /* Check if negotiation is done. Break |
807 | * if there's an error */ | |
808 | err = phy_aneg_done(phydev); | |
809 | if (err < 0) | |
810 | break; | |
811 | ||
6b655529 | 812 | /* If AN is done, we're running */ |
00db8189 | 813 | if (err > 0) { |
6b655529 AF |
814 | phydev->state = PHY_RUNNING; |
815 | netif_carrier_on(phydev->attached_dev); | |
816 | phydev->adjust_link(phydev->attached_dev); | |
00db8189 | 817 | |
6b655529 AF |
818 | } else if (0 == phydev->link_timeout--) { |
819 | int idx; | |
00db8189 | 820 | |
6b655529 AF |
821 | needs_aneg = 1; |
822 | /* If we have the magic_aneg bit, | |
823 | * we try again */ | |
824 | if (phydev->drv->flags & PHY_HAS_MAGICANEG) | |
00db8189 AF |
825 | break; |
826 | ||
6b655529 AF |
827 | /* The timer expired, and we still |
828 | * don't have a setting, so we try | |
829 | * forcing it until we find one that | |
830 | * works, starting from the fastest speed, | |
831 | * and working our way down */ | |
832 | idx = phy_find_valid(0, phydev->supported); | |
00db8189 | 833 | |
6b655529 AF |
834 | phydev->speed = settings[idx].speed; |
835 | phydev->duplex = settings[idx].duplex; | |
00db8189 | 836 | |
6b655529 | 837 | phydev->autoneg = AUTONEG_DISABLE; |
00db8189 | 838 | |
6b655529 AF |
839 | pr_info("Trying %d/%s\n", phydev->speed, |
840 | DUPLEX_FULL == | |
841 | phydev->duplex ? | |
842 | "FULL" : "HALF"); | |
00db8189 AF |
843 | } |
844 | break; | |
845 | case PHY_NOLINK: | |
846 | err = phy_read_status(phydev); | |
847 | ||
848 | if (err) | |
849 | break; | |
850 | ||
851 | if (phydev->link) { | |
852 | phydev->state = PHY_RUNNING; | |
853 | netif_carrier_on(phydev->attached_dev); | |
854 | phydev->adjust_link(phydev->attached_dev); | |
855 | } | |
856 | break; | |
857 | case PHY_FORCING: | |
6b655529 | 858 | err = genphy_update_link(phydev); |
00db8189 AF |
859 | |
860 | if (err) | |
861 | break; | |
862 | ||
863 | if (phydev->link) { | |
864 | phydev->state = PHY_RUNNING; | |
865 | netif_carrier_on(phydev->attached_dev); | |
866 | } else { | |
867 | if (0 == phydev->link_timeout--) { | |
868 | phy_force_reduction(phydev); | |
869 | needs_aneg = 1; | |
870 | } | |
871 | } | |
872 | ||
873 | phydev->adjust_link(phydev->attached_dev); | |
874 | break; | |
875 | case PHY_RUNNING: | |
876 | /* Only register a CHANGE if we are | |
877 | * polling */ | |
878 | if (PHY_POLL == phydev->irq) | |
879 | phydev->state = PHY_CHANGELINK; | |
880 | break; | |
881 | case PHY_CHANGELINK: | |
882 | err = phy_read_status(phydev); | |
883 | ||
884 | if (err) | |
885 | break; | |
886 | ||
887 | if (phydev->link) { | |
888 | phydev->state = PHY_RUNNING; | |
889 | netif_carrier_on(phydev->attached_dev); | |
890 | } else { | |
891 | phydev->state = PHY_NOLINK; | |
892 | netif_carrier_off(phydev->attached_dev); | |
893 | } | |
894 | ||
895 | phydev->adjust_link(phydev->attached_dev); | |
896 | ||
897 | if (PHY_POLL != phydev->irq) | |
898 | err = phy_config_interrupt(phydev, | |
899 | PHY_INTERRUPT_ENABLED); | |
900 | break; | |
901 | case PHY_HALTED: | |
902 | if (phydev->link) { | |
903 | phydev->link = 0; | |
904 | netif_carrier_off(phydev->attached_dev); | |
905 | phydev->adjust_link(phydev->attached_dev); | |
906 | } | |
907 | break; | |
908 | case PHY_RESUMING: | |
909 | ||
910 | err = phy_clear_interrupt(phydev); | |
911 | ||
912 | if (err) | |
913 | break; | |
914 | ||
915 | err = phy_config_interrupt(phydev, | |
916 | PHY_INTERRUPT_ENABLED); | |
917 | ||
918 | if (err) | |
919 | break; | |
920 | ||
921 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
922 | err = phy_aneg_done(phydev); | |
923 | if (err < 0) | |
924 | break; | |
925 | ||
926 | /* err > 0 if AN is done. | |
927 | * Otherwise, it's 0, and we're | |
928 | * still waiting for AN */ | |
929 | if (err > 0) { | |
42caa074 WF |
930 | err = phy_read_status(phydev); |
931 | if (err) | |
932 | break; | |
933 | ||
934 | if (phydev->link) { | |
935 | phydev->state = PHY_RUNNING; | |
936 | netif_carrier_on(phydev->attached_dev); | |
937 | } else | |
938 | phydev->state = PHY_NOLINK; | |
939 | phydev->adjust_link(phydev->attached_dev); | |
00db8189 AF |
940 | } else { |
941 | phydev->state = PHY_AN; | |
942 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
943 | } | |
42caa074 WF |
944 | } else { |
945 | err = phy_read_status(phydev); | |
946 | if (err) | |
947 | break; | |
948 | ||
949 | if (phydev->link) { | |
950 | phydev->state = PHY_RUNNING; | |
951 | netif_carrier_on(phydev->attached_dev); | |
952 | } else | |
953 | phydev->state = PHY_NOLINK; | |
954 | phydev->adjust_link(phydev->attached_dev); | |
955 | } | |
00db8189 AF |
956 | break; |
957 | } | |
958 | ||
35b5f6b1 | 959 | mutex_unlock(&phydev->lock); |
00db8189 AF |
960 | |
961 | if (needs_aneg) | |
962 | err = phy_start_aneg(phydev); | |
963 | ||
964 | if (err < 0) | |
965 | phy_error(phydev); | |
966 | ||
3664090e | 967 | schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ); |
35b5f6b1 | 968 | } |