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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) | |
50 | printk(" - %d/%s", phydev->speed, | |
51 | DUPLEX_FULL == phydev->duplex ? | |
52 | "Full" : "Half"); | |
53 | ||
54 | printk("\n"); | |
55 | } | |
56 | EXPORT_SYMBOL(phy_print_status); | |
00db8189 AF |
57 | |
58 | ||
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 | */ | |
00db8189 AF |
68 | int phy_clear_interrupt(struct phy_device *phydev) |
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 | */ | |
00db8189 AF |
85 | int phy_config_interrupt(struct phy_device *phydev, u32 interrupts) |
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 | */ |
e1393456 | 211 | 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 | } | |
e1393456 | 226 | EXPORT_SYMBOL(phy_sanitize_settings); |
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 | { | |
242 | if (cmd->phy_address != phydev->addr) | |
243 | return -EINVAL; | |
244 | ||
245 | /* We make sure that we don't pass unsupported | |
246 | * values in to the PHY */ | |
247 | cmd->advertising &= phydev->supported; | |
248 | ||
249 | /* Verify the settings we care about. */ | |
250 | if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) | |
251 | return -EINVAL; | |
252 | ||
253 | if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) | |
254 | return -EINVAL; | |
255 | ||
8e95a202 JP |
256 | if (cmd->autoneg == AUTONEG_DISABLE && |
257 | ((cmd->speed != SPEED_1000 && | |
258 | cmd->speed != SPEED_100 && | |
259 | cmd->speed != SPEED_10) || | |
260 | (cmd->duplex != DUPLEX_HALF && | |
261 | cmd->duplex != DUPLEX_FULL))) | |
00db8189 AF |
262 | return -EINVAL; |
263 | ||
264 | phydev->autoneg = cmd->autoneg; | |
265 | ||
266 | phydev->speed = cmd->speed; | |
267 | ||
268 | phydev->advertising = cmd->advertising; | |
269 | ||
270 | if (AUTONEG_ENABLE == cmd->autoneg) | |
271 | phydev->advertising |= ADVERTISED_Autoneg; | |
272 | else | |
273 | phydev->advertising &= ~ADVERTISED_Autoneg; | |
274 | ||
275 | phydev->duplex = cmd->duplex; | |
276 | ||
277 | /* Restart the PHY */ | |
278 | phy_start_aneg(phydev); | |
279 | ||
280 | return 0; | |
281 | } | |
9f6d55d0 | 282 | EXPORT_SYMBOL(phy_ethtool_sset); |
00db8189 AF |
283 | |
284 | int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
285 | { | |
286 | cmd->supported = phydev->supported; | |
287 | ||
288 | cmd->advertising = phydev->advertising; | |
289 | ||
290 | cmd->speed = phydev->speed; | |
291 | cmd->duplex = phydev->duplex; | |
292 | cmd->port = PORT_MII; | |
293 | cmd->phy_address = phydev->addr; | |
294 | cmd->transceiver = XCVR_EXTERNAL; | |
295 | cmd->autoneg = phydev->autoneg; | |
296 | ||
297 | return 0; | |
298 | } | |
9f6d55d0 | 299 | EXPORT_SYMBOL(phy_ethtool_gset); |
00db8189 | 300 | |
b3df0da8 RD |
301 | /** |
302 | * phy_mii_ioctl - generic PHY MII ioctl interface | |
303 | * @phydev: the phy_device struct | |
304 | * @mii_data: MII ioctl data | |
305 | * @cmd: ioctl cmd to execute | |
306 | * | |
307 | * Note that this function is currently incompatible with the | |
00db8189 | 308 | * PHYCONTROL layer. It changes registers without regard to |
b3df0da8 | 309 | * current state. Use at own risk. |
00db8189 AF |
310 | */ |
311 | int phy_mii_ioctl(struct phy_device *phydev, | |
312 | struct mii_ioctl_data *mii_data, int cmd) | |
313 | { | |
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 AF |
321 | case SIOCGMIIREG: |
322 | mii_data->val_out = phy_read(phydev, mii_data->reg_num); | |
323 | break; | |
324 | ||
325 | case SIOCSMIIREG: | |
00db8189 AF |
326 | if (mii_data->phy_id == phydev->addr) { |
327 | switch(mii_data->reg_num) { | |
328 | case MII_BMCR: | |
163642a2 | 329 | if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0) |
00db8189 AF |
330 | phydev->autoneg = AUTONEG_DISABLE; |
331 | else | |
332 | phydev->autoneg = AUTONEG_ENABLE; | |
333 | if ((!phydev->autoneg) && (val & BMCR_FULLDPLX)) | |
334 | phydev->duplex = DUPLEX_FULL; | |
335 | else | |
336 | phydev->duplex = DUPLEX_HALF; | |
024a0a3c SL |
337 | if ((!phydev->autoneg) && |
338 | (val & BMCR_SPEED1000)) | |
339 | phydev->speed = SPEED_1000; | |
340 | else if ((!phydev->autoneg) && | |
341 | (val & BMCR_SPEED100)) | |
342 | phydev->speed = SPEED_100; | |
00db8189 AF |
343 | break; |
344 | case MII_ADVERTISE: | |
345 | phydev->advertising = val; | |
346 | break; | |
347 | default: | |
348 | /* do nothing */ | |
349 | break; | |
350 | } | |
351 | } | |
352 | ||
353 | phy_write(phydev, mii_data->reg_num, val); | |
354 | ||
8e95a202 JP |
355 | if (mii_data->reg_num == MII_BMCR && |
356 | val & BMCR_RESET && | |
357 | phydev->drv->config_init) { | |
f62220d3 | 358 | phy_scan_fixups(phydev); |
00db8189 | 359 | phydev->drv->config_init(phydev); |
f62220d3 | 360 | } |
00db8189 | 361 | break; |
dda93b48 DW |
362 | |
363 | default: | |
c6d6a511 | 364 | return -EOPNOTSUPP; |
00db8189 AF |
365 | } |
366 | ||
367 | return 0; | |
368 | } | |
680e9fe9 | 369 | EXPORT_SYMBOL(phy_mii_ioctl); |
00db8189 | 370 | |
b3df0da8 RD |
371 | /** |
372 | * phy_start_aneg - start auto-negotiation for this PHY device | |
373 | * @phydev: the phy_device struct | |
e1393456 | 374 | * |
b3df0da8 RD |
375 | * Description: Sanitizes the settings (if we're not autonegotiating |
376 | * them), and then calls the driver's config_aneg function. | |
377 | * If the PHYCONTROL Layer is operating, we change the state to | |
378 | * reflect the beginning of Auto-negotiation or forcing. | |
e1393456 AF |
379 | */ |
380 | int phy_start_aneg(struct phy_device *phydev) | |
381 | { | |
382 | int err; | |
383 | ||
35b5f6b1 | 384 | mutex_lock(&phydev->lock); |
e1393456 AF |
385 | |
386 | if (AUTONEG_DISABLE == phydev->autoneg) | |
387 | phy_sanitize_settings(phydev); | |
388 | ||
389 | err = phydev->drv->config_aneg(phydev); | |
390 | ||
e1393456 AF |
391 | if (err < 0) |
392 | goto out_unlock; | |
393 | ||
394 | if (phydev->state != PHY_HALTED) { | |
395 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
396 | phydev->state = PHY_AN; | |
397 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
398 | } else { | |
399 | phydev->state = PHY_FORCING; | |
400 | phydev->link_timeout = PHY_FORCE_TIMEOUT; | |
401 | } | |
402 | } | |
403 | ||
404 | out_unlock: | |
35b5f6b1 | 405 | mutex_unlock(&phydev->lock); |
e1393456 AF |
406 | return err; |
407 | } | |
408 | EXPORT_SYMBOL(phy_start_aneg); | |
409 | ||
410 | ||
c4028958 | 411 | static void phy_change(struct work_struct *work); |
e1393456 | 412 | |
b3df0da8 RD |
413 | /** |
414 | * phy_start_machine - start PHY state machine tracking | |
415 | * @phydev: the phy_device struct | |
416 | * @handler: callback function for state change notifications | |
00db8189 | 417 | * |
b3df0da8 | 418 | * Description: The PHY infrastructure can run a state machine |
00db8189 AF |
419 | * which tracks whether the PHY is starting up, negotiating, |
420 | * etc. This function starts the timer which tracks the state | |
b3df0da8 RD |
421 | * of the PHY. If you want to be notified when the state changes, |
422 | * pass in the callback @handler, otherwise, pass NULL. If you | |
00db8189 | 423 | * want to maintain your own state machine, do not call this |
b3df0da8 RD |
424 | * function. |
425 | */ | |
00db8189 AF |
426 | void phy_start_machine(struct phy_device *phydev, |
427 | void (*handler)(struct net_device *)) | |
428 | { | |
429 | phydev->adjust_state = handler; | |
430 | ||
3664090e | 431 | schedule_delayed_work(&phydev->state_queue, HZ); |
00db8189 AF |
432 | } |
433 | ||
b3df0da8 RD |
434 | /** |
435 | * phy_stop_machine - stop the PHY state machine tracking | |
436 | * @phydev: target phy_device struct | |
00db8189 | 437 | * |
b3df0da8 | 438 | * Description: Stops the state machine timer, sets the state to UP |
817acf5e | 439 | * (unless it wasn't up yet). This function must be called BEFORE |
00db8189 AF |
440 | * phy_detach. |
441 | */ | |
442 | void phy_stop_machine(struct phy_device *phydev) | |
443 | { | |
a390d1f3 | 444 | cancel_delayed_work_sync(&phydev->state_queue); |
00db8189 | 445 | |
35b5f6b1 | 446 | mutex_lock(&phydev->lock); |
00db8189 AF |
447 | if (phydev->state > PHY_UP) |
448 | phydev->state = PHY_UP; | |
35b5f6b1 | 449 | mutex_unlock(&phydev->lock); |
00db8189 | 450 | |
00db8189 AF |
451 | phydev->adjust_state = NULL; |
452 | } | |
453 | ||
b3df0da8 RD |
454 | /** |
455 | * phy_force_reduction - reduce PHY speed/duplex settings by one step | |
456 | * @phydev: target phy_device struct | |
e1393456 | 457 | * |
b3df0da8 RD |
458 | * Description: Reduces the speed/duplex settings by one notch, |
459 | * in this order-- | |
460 | * 1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. | |
461 | * The function bottoms out at 10/HALF. | |
e1393456 AF |
462 | */ |
463 | static void phy_force_reduction(struct phy_device *phydev) | |
464 | { | |
465 | int idx; | |
466 | ||
467 | idx = phy_find_setting(phydev->speed, phydev->duplex); | |
468 | ||
469 | idx++; | |
470 | ||
471 | idx = phy_find_valid(idx, phydev->supported); | |
472 | ||
473 | phydev->speed = settings[idx].speed; | |
474 | phydev->duplex = settings[idx].duplex; | |
475 | ||
476 | pr_info("Trying %d/%s\n", phydev->speed, | |
477 | DUPLEX_FULL == phydev->duplex ? | |
478 | "FULL" : "HALF"); | |
479 | } | |
480 | ||
481 | ||
b3df0da8 RD |
482 | /** |
483 | * phy_error - enter HALTED state for this PHY device | |
484 | * @phydev: target phy_device struct | |
00db8189 AF |
485 | * |
486 | * Moves the PHY to the HALTED state in response to a read | |
487 | * or write error, and tells the controller the link is down. | |
488 | * Must not be called from interrupt context, or while the | |
489 | * phydev->lock is held. | |
490 | */ | |
9b9a8bfc | 491 | static void phy_error(struct phy_device *phydev) |
00db8189 | 492 | { |
35b5f6b1 | 493 | mutex_lock(&phydev->lock); |
00db8189 | 494 | phydev->state = PHY_HALTED; |
35b5f6b1 | 495 | mutex_unlock(&phydev->lock); |
00db8189 AF |
496 | } |
497 | ||
b3df0da8 RD |
498 | /** |
499 | * phy_interrupt - PHY interrupt handler | |
500 | * @irq: interrupt line | |
501 | * @phy_dat: phy_device pointer | |
e1393456 | 502 | * |
b3df0da8 | 503 | * Description: When a PHY interrupt occurs, the handler disables |
e1393456 AF |
504 | * interrupts, and schedules a work task to clear the interrupt. |
505 | */ | |
7d12e780 | 506 | static irqreturn_t phy_interrupt(int irq, void *phy_dat) |
e1393456 AF |
507 | { |
508 | struct phy_device *phydev = phy_dat; | |
509 | ||
3c3070d7 MR |
510 | if (PHY_HALTED == phydev->state) |
511 | return IRQ_NONE; /* It can't be ours. */ | |
512 | ||
e1393456 AF |
513 | /* The MDIO bus is not allowed to be written in interrupt |
514 | * context, so we need to disable the irq here. A work | |
515 | * queue will write the PHY to disable and clear the | |
516 | * interrupt, and then reenable the irq line. */ | |
517 | disable_irq_nosync(irq); | |
0ac49527 | 518 | atomic_inc(&phydev->irq_disable); |
e1393456 AF |
519 | |
520 | schedule_work(&phydev->phy_queue); | |
521 | ||
522 | return IRQ_HANDLED; | |
523 | } | |
524 | ||
b3df0da8 RD |
525 | /** |
526 | * phy_enable_interrupts - Enable the interrupts from the PHY side | |
527 | * @phydev: target phy_device struct | |
528 | */ | |
e1393456 | 529 | int phy_enable_interrupts(struct phy_device *phydev) |
00db8189 AF |
530 | { |
531 | int err; | |
532 | ||
e1393456 | 533 | err = phy_clear_interrupt(phydev); |
00db8189 | 534 | |
e1393456 AF |
535 | if (err < 0) |
536 | return err; | |
00db8189 | 537 | |
e1393456 | 538 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); |
00db8189 AF |
539 | |
540 | return err; | |
541 | } | |
e1393456 | 542 | EXPORT_SYMBOL(phy_enable_interrupts); |
00db8189 | 543 | |
b3df0da8 RD |
544 | /** |
545 | * phy_disable_interrupts - Disable the PHY interrupts from the PHY side | |
546 | * @phydev: target phy_device struct | |
547 | */ | |
e1393456 | 548 | int phy_disable_interrupts(struct phy_device *phydev) |
00db8189 AF |
549 | { |
550 | int err; | |
551 | ||
552 | /* Disable PHY interrupts */ | |
553 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
554 | ||
555 | if (err) | |
556 | goto phy_err; | |
557 | ||
558 | /* Clear the interrupt */ | |
559 | err = phy_clear_interrupt(phydev); | |
560 | ||
561 | if (err) | |
562 | goto phy_err; | |
563 | ||
564 | return 0; | |
565 | ||
566 | phy_err: | |
567 | phy_error(phydev); | |
568 | ||
569 | return err; | |
570 | } | |
e1393456 AF |
571 | EXPORT_SYMBOL(phy_disable_interrupts); |
572 | ||
b3df0da8 RD |
573 | /** |
574 | * phy_start_interrupts - request and enable interrupts for a PHY device | |
575 | * @phydev: target phy_device struct | |
e1393456 | 576 | * |
b3df0da8 RD |
577 | * Description: Request the interrupt for the given PHY. |
578 | * If this fails, then we set irq to PHY_POLL. | |
e1393456 | 579 | * Otherwise, we enable the interrupts in the PHY. |
e1393456 | 580 | * This should only be called with a valid IRQ number. |
b3df0da8 | 581 | * Returns 0 on success or < 0 on error. |
e1393456 AF |
582 | */ |
583 | int phy_start_interrupts(struct phy_device *phydev) | |
584 | { | |
585 | int err = 0; | |
586 | ||
c4028958 | 587 | INIT_WORK(&phydev->phy_queue, phy_change); |
e1393456 | 588 | |
0ac49527 | 589 | atomic_set(&phydev->irq_disable, 0); |
e1393456 | 590 | if (request_irq(phydev->irq, phy_interrupt, |
1fb9df5d | 591 | IRQF_SHARED, |
e1393456 AF |
592 | "phy_interrupt", |
593 | phydev) < 0) { | |
594 | printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n", | |
595 | phydev->bus->name, | |
596 | phydev->irq); | |
597 | phydev->irq = PHY_POLL; | |
598 | return 0; | |
599 | } | |
600 | ||
601 | err = phy_enable_interrupts(phydev); | |
602 | ||
603 | return err; | |
604 | } | |
605 | EXPORT_SYMBOL(phy_start_interrupts); | |
606 | ||
b3df0da8 RD |
607 | /** |
608 | * phy_stop_interrupts - disable interrupts from a PHY device | |
609 | * @phydev: target phy_device struct | |
610 | */ | |
e1393456 AF |
611 | int phy_stop_interrupts(struct phy_device *phydev) |
612 | { | |
613 | int err; | |
614 | ||
615 | err = phy_disable_interrupts(phydev); | |
616 | ||
617 | if (err) | |
618 | phy_error(phydev); | |
619 | ||
0ac49527 MR |
620 | free_irq(phydev->irq, phydev); |
621 | ||
3c3070d7 | 622 | /* |
0ac49527 MR |
623 | * Cannot call flush_scheduled_work() here as desired because |
624 | * of rtnl_lock(), but we do not really care about what would | |
625 | * be done, except from enable_irq(), so cancel any work | |
626 | * possibly pending and take care of the matter below. | |
3c3070d7 | 627 | */ |
28e53bdd | 628 | cancel_work_sync(&phydev->phy_queue); |
0ac49527 MR |
629 | /* |
630 | * If work indeed has been cancelled, disable_irq() will have | |
631 | * been left unbalanced from phy_interrupt() and enable_irq() | |
632 | * has to be called so that other devices on the line work. | |
633 | */ | |
634 | while (atomic_dec_return(&phydev->irq_disable) >= 0) | |
635 | enable_irq(phydev->irq); | |
e1393456 AF |
636 | |
637 | return err; | |
638 | } | |
639 | EXPORT_SYMBOL(phy_stop_interrupts); | |
640 | ||
641 | ||
b3df0da8 RD |
642 | /** |
643 | * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes | |
644 | * @work: work_struct that describes the work to be done | |
645 | */ | |
c4028958 | 646 | static void phy_change(struct work_struct *work) |
e1393456 AF |
647 | { |
648 | int err; | |
c4028958 DH |
649 | struct phy_device *phydev = |
650 | container_of(work, struct phy_device, phy_queue); | |
e1393456 | 651 | |
a8729eb3 AG |
652 | if (phydev->drv->did_interrupt && |
653 | !phydev->drv->did_interrupt(phydev)) | |
654 | goto ignore; | |
655 | ||
e1393456 AF |
656 | err = phy_disable_interrupts(phydev); |
657 | ||
658 | if (err) | |
659 | goto phy_err; | |
660 | ||
35b5f6b1 | 661 | mutex_lock(&phydev->lock); |
e1393456 AF |
662 | if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state)) |
663 | phydev->state = PHY_CHANGELINK; | |
35b5f6b1 | 664 | mutex_unlock(&phydev->lock); |
e1393456 | 665 | |
0ac49527 | 666 | atomic_dec(&phydev->irq_disable); |
e1393456 AF |
667 | enable_irq(phydev->irq); |
668 | ||
669 | /* Reenable interrupts */ | |
3c3070d7 MR |
670 | if (PHY_HALTED != phydev->state) |
671 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); | |
e1393456 AF |
672 | |
673 | if (err) | |
674 | goto irq_enable_err; | |
675 | ||
a390d1f3 MS |
676 | /* reschedule state queue work to run as soon as possible */ |
677 | cancel_delayed_work_sync(&phydev->state_queue); | |
678 | schedule_delayed_work(&phydev->state_queue, 0); | |
0acb2839 | 679 | |
e1393456 AF |
680 | return; |
681 | ||
a8729eb3 AG |
682 | ignore: |
683 | atomic_dec(&phydev->irq_disable); | |
684 | enable_irq(phydev->irq); | |
685 | return; | |
686 | ||
e1393456 AF |
687 | irq_enable_err: |
688 | disable_irq(phydev->irq); | |
0ac49527 | 689 | atomic_inc(&phydev->irq_disable); |
e1393456 AF |
690 | phy_err: |
691 | phy_error(phydev); | |
692 | } | |
693 | ||
b3df0da8 RD |
694 | /** |
695 | * phy_stop - Bring down the PHY link, and stop checking the status | |
696 | * @phydev: target phy_device struct | |
697 | */ | |
e1393456 AF |
698 | void phy_stop(struct phy_device *phydev) |
699 | { | |
35b5f6b1 | 700 | mutex_lock(&phydev->lock); |
e1393456 AF |
701 | |
702 | if (PHY_HALTED == phydev->state) | |
703 | goto out_unlock; | |
704 | ||
3c3070d7 | 705 | if (phydev->irq != PHY_POLL) { |
e1393456 AF |
706 | /* Disable PHY Interrupts */ |
707 | phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
e1393456 | 708 | |
3c3070d7 MR |
709 | /* Clear any pending interrupts */ |
710 | phy_clear_interrupt(phydev); | |
711 | } | |
e1393456 | 712 | |
6daf6531 MR |
713 | phydev->state = PHY_HALTED; |
714 | ||
e1393456 | 715 | out_unlock: |
35b5f6b1 | 716 | mutex_unlock(&phydev->lock); |
3c3070d7 MR |
717 | |
718 | /* | |
719 | * Cannot call flush_scheduled_work() here as desired because | |
720 | * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change() | |
721 | * will not reenable interrupts. | |
722 | */ | |
e1393456 AF |
723 | } |
724 | ||
725 | ||
b3df0da8 RD |
726 | /** |
727 | * phy_start - start or restart a PHY device | |
728 | * @phydev: target phy_device struct | |
e1393456 | 729 | * |
b3df0da8 | 730 | * Description: Indicates the attached device's readiness to |
e1393456 AF |
731 | * handle PHY-related work. Used during startup to start the |
732 | * PHY, and after a call to phy_stop() to resume operation. | |
733 | * Also used to indicate the MDIO bus has cleared an error | |
734 | * condition. | |
735 | */ | |
736 | void phy_start(struct phy_device *phydev) | |
737 | { | |
35b5f6b1 | 738 | mutex_lock(&phydev->lock); |
e1393456 AF |
739 | |
740 | switch (phydev->state) { | |
741 | case PHY_STARTING: | |
742 | phydev->state = PHY_PENDING; | |
743 | break; | |
744 | case PHY_READY: | |
745 | phydev->state = PHY_UP; | |
746 | break; | |
747 | case PHY_HALTED: | |
748 | phydev->state = PHY_RESUMING; | |
749 | default: | |
750 | break; | |
751 | } | |
35b5f6b1 | 752 | mutex_unlock(&phydev->lock); |
e1393456 AF |
753 | } |
754 | EXPORT_SYMBOL(phy_stop); | |
755 | EXPORT_SYMBOL(phy_start); | |
67c4f3fa | 756 | |
35b5f6b1 NC |
757 | /** |
758 | * phy_state_machine - Handle the state machine | |
759 | * @work: work_struct that describes the work to be done | |
35b5f6b1 | 760 | */ |
4f9c85a1 | 761 | void phy_state_machine(struct work_struct *work) |
00db8189 | 762 | { |
bf6aede7 | 763 | struct delayed_work *dwork = to_delayed_work(work); |
35b5f6b1 | 764 | struct phy_device *phydev = |
a390d1f3 | 765 | container_of(dwork, struct phy_device, state_queue); |
00db8189 AF |
766 | int needs_aneg = 0; |
767 | int err = 0; | |
768 | ||
35b5f6b1 | 769 | mutex_lock(&phydev->lock); |
00db8189 AF |
770 | |
771 | if (phydev->adjust_state) | |
772 | phydev->adjust_state(phydev->attached_dev); | |
773 | ||
774 | switch(phydev->state) { | |
775 | case PHY_DOWN: | |
776 | case PHY_STARTING: | |
777 | case PHY_READY: | |
778 | case PHY_PENDING: | |
779 | break; | |
780 | case PHY_UP: | |
781 | needs_aneg = 1; | |
782 | ||
783 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
784 | ||
785 | break; | |
786 | case PHY_AN: | |
6b655529 AF |
787 | err = phy_read_status(phydev); |
788 | ||
789 | if (err < 0) | |
790 | break; | |
791 | ||
792 | /* If the link is down, give up on | |
793 | * negotiation for now */ | |
794 | if (!phydev->link) { | |
795 | phydev->state = PHY_NOLINK; | |
796 | netif_carrier_off(phydev->attached_dev); | |
797 | phydev->adjust_link(phydev->attached_dev); | |
798 | break; | |
799 | } | |
800 | ||
00db8189 AF |
801 | /* Check if negotiation is done. Break |
802 | * if there's an error */ | |
803 | err = phy_aneg_done(phydev); | |
804 | if (err < 0) | |
805 | break; | |
806 | ||
6b655529 | 807 | /* If AN is done, we're running */ |
00db8189 | 808 | if (err > 0) { |
6b655529 AF |
809 | phydev->state = PHY_RUNNING; |
810 | netif_carrier_on(phydev->attached_dev); | |
811 | phydev->adjust_link(phydev->attached_dev); | |
00db8189 | 812 | |
6b655529 AF |
813 | } else if (0 == phydev->link_timeout--) { |
814 | int idx; | |
00db8189 | 815 | |
6b655529 AF |
816 | needs_aneg = 1; |
817 | /* If we have the magic_aneg bit, | |
818 | * we try again */ | |
819 | if (phydev->drv->flags & PHY_HAS_MAGICANEG) | |
00db8189 AF |
820 | break; |
821 | ||
6b655529 AF |
822 | /* The timer expired, and we still |
823 | * don't have a setting, so we try | |
824 | * forcing it until we find one that | |
825 | * works, starting from the fastest speed, | |
826 | * and working our way down */ | |
827 | idx = phy_find_valid(0, phydev->supported); | |
00db8189 | 828 | |
6b655529 AF |
829 | phydev->speed = settings[idx].speed; |
830 | phydev->duplex = settings[idx].duplex; | |
00db8189 | 831 | |
6b655529 | 832 | phydev->autoneg = AUTONEG_DISABLE; |
00db8189 | 833 | |
6b655529 AF |
834 | pr_info("Trying %d/%s\n", phydev->speed, |
835 | DUPLEX_FULL == | |
836 | phydev->duplex ? | |
837 | "FULL" : "HALF"); | |
00db8189 AF |
838 | } |
839 | break; | |
840 | case PHY_NOLINK: | |
841 | err = phy_read_status(phydev); | |
842 | ||
843 | if (err) | |
844 | break; | |
845 | ||
846 | if (phydev->link) { | |
847 | phydev->state = PHY_RUNNING; | |
848 | netif_carrier_on(phydev->attached_dev); | |
849 | phydev->adjust_link(phydev->attached_dev); | |
850 | } | |
851 | break; | |
852 | case PHY_FORCING: | |
6b655529 | 853 | err = genphy_update_link(phydev); |
00db8189 AF |
854 | |
855 | if (err) | |
856 | break; | |
857 | ||
858 | if (phydev->link) { | |
859 | phydev->state = PHY_RUNNING; | |
860 | netif_carrier_on(phydev->attached_dev); | |
861 | } else { | |
862 | if (0 == phydev->link_timeout--) { | |
863 | phy_force_reduction(phydev); | |
864 | needs_aneg = 1; | |
865 | } | |
866 | } | |
867 | ||
868 | phydev->adjust_link(phydev->attached_dev); | |
869 | break; | |
870 | case PHY_RUNNING: | |
871 | /* Only register a CHANGE if we are | |
872 | * polling */ | |
873 | if (PHY_POLL == phydev->irq) | |
874 | phydev->state = PHY_CHANGELINK; | |
875 | break; | |
876 | case PHY_CHANGELINK: | |
877 | err = phy_read_status(phydev); | |
878 | ||
879 | if (err) | |
880 | break; | |
881 | ||
882 | if (phydev->link) { | |
883 | phydev->state = PHY_RUNNING; | |
884 | netif_carrier_on(phydev->attached_dev); | |
885 | } else { | |
886 | phydev->state = PHY_NOLINK; | |
887 | netif_carrier_off(phydev->attached_dev); | |
888 | } | |
889 | ||
890 | phydev->adjust_link(phydev->attached_dev); | |
891 | ||
892 | if (PHY_POLL != phydev->irq) | |
893 | err = phy_config_interrupt(phydev, | |
894 | PHY_INTERRUPT_ENABLED); | |
895 | break; | |
896 | case PHY_HALTED: | |
897 | if (phydev->link) { | |
898 | phydev->link = 0; | |
899 | netif_carrier_off(phydev->attached_dev); | |
900 | phydev->adjust_link(phydev->attached_dev); | |
901 | } | |
902 | break; | |
903 | case PHY_RESUMING: | |
904 | ||
905 | err = phy_clear_interrupt(phydev); | |
906 | ||
907 | if (err) | |
908 | break; | |
909 | ||
910 | err = phy_config_interrupt(phydev, | |
911 | PHY_INTERRUPT_ENABLED); | |
912 | ||
913 | if (err) | |
914 | break; | |
915 | ||
916 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
917 | err = phy_aneg_done(phydev); | |
918 | if (err < 0) | |
919 | break; | |
920 | ||
921 | /* err > 0 if AN is done. | |
922 | * Otherwise, it's 0, and we're | |
923 | * still waiting for AN */ | |
924 | if (err > 0) { | |
42caa074 WF |
925 | err = phy_read_status(phydev); |
926 | if (err) | |
927 | break; | |
928 | ||
929 | if (phydev->link) { | |
930 | phydev->state = PHY_RUNNING; | |
931 | netif_carrier_on(phydev->attached_dev); | |
932 | } else | |
933 | phydev->state = PHY_NOLINK; | |
934 | phydev->adjust_link(phydev->attached_dev); | |
00db8189 AF |
935 | } else { |
936 | phydev->state = PHY_AN; | |
937 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
938 | } | |
42caa074 WF |
939 | } else { |
940 | err = phy_read_status(phydev); | |
941 | if (err) | |
942 | break; | |
943 | ||
944 | if (phydev->link) { | |
945 | phydev->state = PHY_RUNNING; | |
946 | netif_carrier_on(phydev->attached_dev); | |
947 | } else | |
948 | phydev->state = PHY_NOLINK; | |
949 | phydev->adjust_link(phydev->attached_dev); | |
950 | } | |
00db8189 AF |
951 | break; |
952 | } | |
953 | ||
35b5f6b1 | 954 | mutex_unlock(&phydev->lock); |
00db8189 AF |
955 | |
956 | if (needs_aneg) | |
957 | err = phy_start_aneg(phydev); | |
958 | ||
959 | if (err < 0) | |
960 | phy_error(phydev); | |
961 | ||
3664090e | 962 | schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ); |
35b5f6b1 | 963 | } |