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> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/etherdevice.h> | |
28 | #include <linux/skbuff.h> | |
00db8189 AF |
29 | #include <linux/mm.h> |
30 | #include <linux/module.h> | |
00db8189 AF |
31 | #include <linux/mii.h> |
32 | #include <linux/ethtool.h> | |
33 | #include <linux/phy.h> | |
3c3070d7 MR |
34 | #include <linux/timer.h> |
35 | #include <linux/workqueue.h> | |
00db8189 | 36 | |
0ac49527 | 37 | #include <asm/atomic.h> |
00db8189 AF |
38 | #include <asm/io.h> |
39 | #include <asm/irq.h> | |
40 | #include <asm/uaccess.h> | |
41 | ||
b3df0da8 RD |
42 | /** |
43 | * phy_print_status - Convenience function to print out the current phy status | |
44 | * @phydev: the phy_device struct | |
e1393456 AF |
45 | */ |
46 | void phy_print_status(struct phy_device *phydev) | |
47 | { | |
fb28ad35 | 48 | pr_info("PHY: %s - Link is %s", dev_name(&phydev->dev), |
e1393456 AF |
49 | phydev->link ? "Up" : "Down"); |
50 | if (phydev->link) | |
51 | printk(" - %d/%s", phydev->speed, | |
52 | DUPLEX_FULL == phydev->duplex ? | |
53 | "Full" : "Half"); | |
54 | ||
55 | printk("\n"); | |
56 | } | |
57 | EXPORT_SYMBOL(phy_print_status); | |
00db8189 AF |
58 | |
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 | */ | |
00db8189 AF |
69 | int phy_clear_interrupt(struct phy_device *phydev) |
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 | */ | |
00db8189 AF |
86 | int phy_config_interrupt(struct phy_device *phydev, u32 interrupts) |
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 | */ |
e1393456 | 212 | 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 | } | |
e1393456 | 227 | EXPORT_SYMBOL(phy_sanitize_settings); |
00db8189 | 228 | |
b3df0da8 RD |
229 | /** |
230 | * phy_ethtool_sset - generic ethtool sset function, handles all the details | |
231 | * @phydev: target phy_device struct | |
232 | * @cmd: ethtool_cmd | |
00db8189 AF |
233 | * |
234 | * A few notes about parameter checking: | |
235 | * - We don't set port or transceiver, so we don't care what they | |
236 | * were set to. | |
237 | * - phy_start_aneg() will make sure forced settings are sane, and | |
238 | * choose the next best ones from the ones selected, so we don't | |
b3df0da8 | 239 | * care if ethtool tries to give us bad values. |
00db8189 AF |
240 | */ |
241 | int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
242 | { | |
243 | if (cmd->phy_address != phydev->addr) | |
244 | return -EINVAL; | |
245 | ||
246 | /* We make sure that we don't pass unsupported | |
247 | * values in to the PHY */ | |
248 | cmd->advertising &= phydev->supported; | |
249 | ||
250 | /* Verify the settings we care about. */ | |
251 | if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) | |
252 | return -EINVAL; | |
253 | ||
254 | if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) | |
255 | return -EINVAL; | |
256 | ||
257 | if (cmd->autoneg == AUTONEG_DISABLE | |
258 | && ((cmd->speed != SPEED_1000 | |
259 | && cmd->speed != SPEED_100 | |
260 | && cmd->speed != SPEED_10) | |
261 | || (cmd->duplex != DUPLEX_HALF | |
262 | && cmd->duplex != DUPLEX_FULL))) | |
263 | return -EINVAL; | |
264 | ||
265 | phydev->autoneg = cmd->autoneg; | |
266 | ||
267 | phydev->speed = cmd->speed; | |
268 | ||
269 | phydev->advertising = cmd->advertising; | |
270 | ||
271 | if (AUTONEG_ENABLE == cmd->autoneg) | |
272 | phydev->advertising |= ADVERTISED_Autoneg; | |
273 | else | |
274 | phydev->advertising &= ~ADVERTISED_Autoneg; | |
275 | ||
276 | phydev->duplex = cmd->duplex; | |
277 | ||
278 | /* Restart the PHY */ | |
279 | phy_start_aneg(phydev); | |
280 | ||
281 | return 0; | |
282 | } | |
9f6d55d0 | 283 | EXPORT_SYMBOL(phy_ethtool_sset); |
00db8189 AF |
284 | |
285 | int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
286 | { | |
287 | cmd->supported = phydev->supported; | |
288 | ||
289 | cmd->advertising = phydev->advertising; | |
290 | ||
291 | cmd->speed = phydev->speed; | |
292 | cmd->duplex = phydev->duplex; | |
293 | cmd->port = PORT_MII; | |
294 | cmd->phy_address = phydev->addr; | |
295 | cmd->transceiver = XCVR_EXTERNAL; | |
296 | cmd->autoneg = phydev->autoneg; | |
297 | ||
298 | return 0; | |
299 | } | |
9f6d55d0 | 300 | EXPORT_SYMBOL(phy_ethtool_gset); |
00db8189 | 301 | |
b3df0da8 RD |
302 | /** |
303 | * phy_mii_ioctl - generic PHY MII ioctl interface | |
304 | * @phydev: the phy_device struct | |
305 | * @mii_data: MII ioctl data | |
306 | * @cmd: ioctl cmd to execute | |
307 | * | |
308 | * Note that this function is currently incompatible with the | |
00db8189 | 309 | * PHYCONTROL layer. It changes registers without regard to |
b3df0da8 | 310 | * current state. Use at own risk. |
00db8189 AF |
311 | */ |
312 | int phy_mii_ioctl(struct phy_device *phydev, | |
313 | struct mii_ioctl_data *mii_data, int cmd) | |
314 | { | |
315 | u16 val = mii_data->val_in; | |
316 | ||
317 | switch (cmd) { | |
318 | case SIOCGMIIPHY: | |
319 | mii_data->phy_id = phydev->addr; | |
c6d6a511 LB |
320 | /* fall through */ |
321 | ||
00db8189 AF |
322 | case SIOCGMIIREG: |
323 | mii_data->val_out = phy_read(phydev, mii_data->reg_num); | |
324 | break; | |
325 | ||
326 | case SIOCSMIIREG: | |
327 | if (!capable(CAP_NET_ADMIN)) | |
328 | return -EPERM; | |
329 | ||
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 | ||
357 | phy_write(phydev, mii_data->reg_num, val); | |
358 | ||
359 | if (mii_data->reg_num == MII_BMCR | |
360 | && val & BMCR_RESET | |
f62220d3 AF |
361 | && phydev->drv->config_init) { |
362 | phy_scan_fixups(phydev); | |
00db8189 | 363 | phydev->drv->config_init(phydev); |
f62220d3 | 364 | } |
00db8189 | 365 | break; |
dda93b48 DW |
366 | |
367 | default: | |
c6d6a511 | 368 | return -EOPNOTSUPP; |
00db8189 AF |
369 | } |
370 | ||
371 | return 0; | |
372 | } | |
680e9fe9 | 373 | EXPORT_SYMBOL(phy_mii_ioctl); |
00db8189 | 374 | |
b3df0da8 RD |
375 | /** |
376 | * phy_start_aneg - start auto-negotiation for this PHY device | |
377 | * @phydev: the phy_device struct | |
e1393456 | 378 | * |
b3df0da8 RD |
379 | * Description: Sanitizes the settings (if we're not autonegotiating |
380 | * them), and then calls the driver's config_aneg function. | |
381 | * If the PHYCONTROL Layer is operating, we change the state to | |
382 | * reflect the beginning of Auto-negotiation or forcing. | |
e1393456 AF |
383 | */ |
384 | int phy_start_aneg(struct phy_device *phydev) | |
385 | { | |
386 | int err; | |
387 | ||
35b5f6b1 | 388 | mutex_lock(&phydev->lock); |
e1393456 AF |
389 | |
390 | if (AUTONEG_DISABLE == phydev->autoneg) | |
391 | phy_sanitize_settings(phydev); | |
392 | ||
393 | err = phydev->drv->config_aneg(phydev); | |
394 | ||
e1393456 AF |
395 | if (err < 0) |
396 | goto out_unlock; | |
397 | ||
398 | if (phydev->state != PHY_HALTED) { | |
399 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
400 | phydev->state = PHY_AN; | |
401 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
402 | } else { | |
403 | phydev->state = PHY_FORCING; | |
404 | phydev->link_timeout = PHY_FORCE_TIMEOUT; | |
405 | } | |
406 | } | |
407 | ||
408 | out_unlock: | |
35b5f6b1 | 409 | mutex_unlock(&phydev->lock); |
e1393456 AF |
410 | return err; |
411 | } | |
412 | EXPORT_SYMBOL(phy_start_aneg); | |
413 | ||
414 | ||
c4028958 | 415 | static void phy_change(struct work_struct *work); |
35b5f6b1 | 416 | static void phy_state_machine(struct work_struct *work); |
e1393456 AF |
417 | static void phy_timer(unsigned long data); |
418 | ||
b3df0da8 RD |
419 | /** |
420 | * phy_start_machine - start PHY state machine tracking | |
421 | * @phydev: the phy_device struct | |
422 | * @handler: callback function for state change notifications | |
00db8189 | 423 | * |
b3df0da8 | 424 | * Description: The PHY infrastructure can run a state machine |
00db8189 AF |
425 | * which tracks whether the PHY is starting up, negotiating, |
426 | * etc. This function starts the timer which tracks the state | |
b3df0da8 RD |
427 | * of the PHY. If you want to be notified when the state changes, |
428 | * pass in the callback @handler, otherwise, pass NULL. If you | |
00db8189 | 429 | * want to maintain your own state machine, do not call this |
b3df0da8 RD |
430 | * function. |
431 | */ | |
00db8189 AF |
432 | void phy_start_machine(struct phy_device *phydev, |
433 | void (*handler)(struct net_device *)) | |
434 | { | |
435 | phydev->adjust_state = handler; | |
436 | ||
35b5f6b1 | 437 | INIT_WORK(&phydev->state_queue, phy_state_machine); |
00db8189 AF |
438 | init_timer(&phydev->phy_timer); |
439 | phydev->phy_timer.function = &phy_timer; | |
440 | phydev->phy_timer.data = (unsigned long) phydev; | |
441 | mod_timer(&phydev->phy_timer, jiffies + HZ); | |
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 | { | |
454 | del_timer_sync(&phydev->phy_timer); | |
35b5f6b1 | 455 | cancel_work_sync(&phydev->state_queue); |
00db8189 | 456 | |
35b5f6b1 | 457 | mutex_lock(&phydev->lock); |
00db8189 AF |
458 | if (phydev->state > PHY_UP) |
459 | phydev->state = PHY_UP; | |
35b5f6b1 | 460 | mutex_unlock(&phydev->lock); |
00db8189 | 461 | |
00db8189 AF |
462 | phydev->adjust_state = NULL; |
463 | } | |
464 | ||
b3df0da8 RD |
465 | /** |
466 | * phy_force_reduction - reduce PHY speed/duplex settings by one step | |
467 | * @phydev: target phy_device struct | |
e1393456 | 468 | * |
b3df0da8 RD |
469 | * Description: Reduces the speed/duplex settings by one notch, |
470 | * in this order-- | |
471 | * 1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. | |
472 | * The function bottoms out at 10/HALF. | |
e1393456 AF |
473 | */ |
474 | static void phy_force_reduction(struct phy_device *phydev) | |
475 | { | |
476 | int idx; | |
477 | ||
478 | idx = phy_find_setting(phydev->speed, phydev->duplex); | |
479 | ||
480 | idx++; | |
481 | ||
482 | idx = phy_find_valid(idx, phydev->supported); | |
483 | ||
484 | phydev->speed = settings[idx].speed; | |
485 | phydev->duplex = settings[idx].duplex; | |
486 | ||
487 | pr_info("Trying %d/%s\n", phydev->speed, | |
488 | DUPLEX_FULL == phydev->duplex ? | |
489 | "FULL" : "HALF"); | |
490 | } | |
491 | ||
492 | ||
b3df0da8 RD |
493 | /** |
494 | * phy_error - enter HALTED state for this PHY device | |
495 | * @phydev: target phy_device struct | |
00db8189 AF |
496 | * |
497 | * Moves the PHY to the HALTED state in response to a read | |
498 | * or write error, and tells the controller the link is down. | |
499 | * Must not be called from interrupt context, or while the | |
500 | * phydev->lock is held. | |
501 | */ | |
9b9a8bfc | 502 | static void phy_error(struct phy_device *phydev) |
00db8189 | 503 | { |
35b5f6b1 | 504 | mutex_lock(&phydev->lock); |
00db8189 | 505 | phydev->state = PHY_HALTED; |
35b5f6b1 | 506 | mutex_unlock(&phydev->lock); |
00db8189 AF |
507 | } |
508 | ||
b3df0da8 RD |
509 | /** |
510 | * phy_interrupt - PHY interrupt handler | |
511 | * @irq: interrupt line | |
512 | * @phy_dat: phy_device pointer | |
e1393456 | 513 | * |
b3df0da8 | 514 | * Description: When a PHY interrupt occurs, the handler disables |
e1393456 AF |
515 | * interrupts, and schedules a work task to clear the interrupt. |
516 | */ | |
7d12e780 | 517 | static irqreturn_t phy_interrupt(int irq, void *phy_dat) |
e1393456 AF |
518 | { |
519 | struct phy_device *phydev = phy_dat; | |
520 | ||
3c3070d7 MR |
521 | if (PHY_HALTED == phydev->state) |
522 | return IRQ_NONE; /* It can't be ours. */ | |
523 | ||
e1393456 AF |
524 | /* The MDIO bus is not allowed to be written in interrupt |
525 | * context, so we need to disable the irq here. A work | |
526 | * queue will write the PHY to disable and clear the | |
527 | * interrupt, and then reenable the irq line. */ | |
528 | disable_irq_nosync(irq); | |
0ac49527 | 529 | atomic_inc(&phydev->irq_disable); |
e1393456 AF |
530 | |
531 | schedule_work(&phydev->phy_queue); | |
532 | ||
533 | return IRQ_HANDLED; | |
534 | } | |
535 | ||
b3df0da8 RD |
536 | /** |
537 | * phy_enable_interrupts - Enable the interrupts from the PHY side | |
538 | * @phydev: target phy_device struct | |
539 | */ | |
e1393456 | 540 | int phy_enable_interrupts(struct phy_device *phydev) |
00db8189 AF |
541 | { |
542 | int err; | |
543 | ||
e1393456 | 544 | err = phy_clear_interrupt(phydev); |
00db8189 | 545 | |
e1393456 AF |
546 | if (err < 0) |
547 | return err; | |
00db8189 | 548 | |
e1393456 | 549 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); |
00db8189 AF |
550 | |
551 | return err; | |
552 | } | |
e1393456 | 553 | EXPORT_SYMBOL(phy_enable_interrupts); |
00db8189 | 554 | |
b3df0da8 RD |
555 | /** |
556 | * phy_disable_interrupts - Disable the PHY interrupts from the PHY side | |
557 | * @phydev: target phy_device struct | |
558 | */ | |
e1393456 | 559 | int phy_disable_interrupts(struct phy_device *phydev) |
00db8189 AF |
560 | { |
561 | int err; | |
562 | ||
563 | /* Disable PHY interrupts */ | |
564 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
565 | ||
566 | if (err) | |
567 | goto phy_err; | |
568 | ||
569 | /* Clear the interrupt */ | |
570 | err = phy_clear_interrupt(phydev); | |
571 | ||
572 | if (err) | |
573 | goto phy_err; | |
574 | ||
575 | return 0; | |
576 | ||
577 | phy_err: | |
578 | phy_error(phydev); | |
579 | ||
580 | return err; | |
581 | } | |
e1393456 AF |
582 | EXPORT_SYMBOL(phy_disable_interrupts); |
583 | ||
b3df0da8 RD |
584 | /** |
585 | * phy_start_interrupts - request and enable interrupts for a PHY device | |
586 | * @phydev: target phy_device struct | |
e1393456 | 587 | * |
b3df0da8 RD |
588 | * Description: Request the interrupt for the given PHY. |
589 | * If this fails, then we set irq to PHY_POLL. | |
e1393456 | 590 | * Otherwise, we enable the interrupts in the PHY. |
e1393456 | 591 | * This should only be called with a valid IRQ number. |
b3df0da8 | 592 | * Returns 0 on success or < 0 on error. |
e1393456 AF |
593 | */ |
594 | int phy_start_interrupts(struct phy_device *phydev) | |
595 | { | |
596 | int err = 0; | |
597 | ||
c4028958 | 598 | INIT_WORK(&phydev->phy_queue, phy_change); |
e1393456 | 599 | |
0ac49527 | 600 | atomic_set(&phydev->irq_disable, 0); |
e1393456 | 601 | if (request_irq(phydev->irq, phy_interrupt, |
1fb9df5d | 602 | IRQF_SHARED, |
e1393456 AF |
603 | "phy_interrupt", |
604 | phydev) < 0) { | |
605 | printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n", | |
606 | phydev->bus->name, | |
607 | phydev->irq); | |
608 | phydev->irq = PHY_POLL; | |
609 | return 0; | |
610 | } | |
611 | ||
612 | err = phy_enable_interrupts(phydev); | |
613 | ||
614 | return err; | |
615 | } | |
616 | EXPORT_SYMBOL(phy_start_interrupts); | |
617 | ||
b3df0da8 RD |
618 | /** |
619 | * phy_stop_interrupts - disable interrupts from a PHY device | |
620 | * @phydev: target phy_device struct | |
621 | */ | |
e1393456 AF |
622 | int phy_stop_interrupts(struct phy_device *phydev) |
623 | { | |
624 | int err; | |
625 | ||
626 | err = phy_disable_interrupts(phydev); | |
627 | ||
628 | if (err) | |
629 | phy_error(phydev); | |
630 | ||
0ac49527 MR |
631 | free_irq(phydev->irq, phydev); |
632 | ||
3c3070d7 | 633 | /* |
0ac49527 MR |
634 | * Cannot call flush_scheduled_work() here as desired because |
635 | * of rtnl_lock(), but we do not really care about what would | |
636 | * be done, except from enable_irq(), so cancel any work | |
637 | * possibly pending and take care of the matter below. | |
3c3070d7 | 638 | */ |
28e53bdd | 639 | cancel_work_sync(&phydev->phy_queue); |
0ac49527 MR |
640 | /* |
641 | * If work indeed has been cancelled, disable_irq() will have | |
642 | * been left unbalanced from phy_interrupt() and enable_irq() | |
643 | * has to be called so that other devices on the line work. | |
644 | */ | |
645 | while (atomic_dec_return(&phydev->irq_disable) >= 0) | |
646 | enable_irq(phydev->irq); | |
e1393456 AF |
647 | |
648 | return err; | |
649 | } | |
650 | EXPORT_SYMBOL(phy_stop_interrupts); | |
651 | ||
652 | ||
b3df0da8 RD |
653 | /** |
654 | * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes | |
655 | * @work: work_struct that describes the work to be done | |
656 | */ | |
c4028958 | 657 | static void phy_change(struct work_struct *work) |
e1393456 AF |
658 | { |
659 | int err; | |
c4028958 DH |
660 | struct phy_device *phydev = |
661 | container_of(work, struct phy_device, phy_queue); | |
e1393456 AF |
662 | |
663 | err = phy_disable_interrupts(phydev); | |
664 | ||
665 | if (err) | |
666 | goto phy_err; | |
667 | ||
35b5f6b1 | 668 | mutex_lock(&phydev->lock); |
e1393456 AF |
669 | if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state)) |
670 | phydev->state = PHY_CHANGELINK; | |
35b5f6b1 | 671 | mutex_unlock(&phydev->lock); |
e1393456 | 672 | |
0ac49527 | 673 | atomic_dec(&phydev->irq_disable); |
e1393456 AF |
674 | enable_irq(phydev->irq); |
675 | ||
676 | /* Reenable interrupts */ | |
3c3070d7 MR |
677 | if (PHY_HALTED != phydev->state) |
678 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); | |
e1393456 AF |
679 | |
680 | if (err) | |
681 | goto irq_enable_err; | |
682 | ||
0acb2839 TP |
683 | /* Stop timer and run the state queue now. The work function for |
684 | * state_queue will start the timer up again. | |
685 | */ | |
686 | del_timer(&phydev->phy_timer); | |
687 | schedule_work(&phydev->state_queue); | |
688 | ||
e1393456 AF |
689 | return; |
690 | ||
691 | irq_enable_err: | |
692 | disable_irq(phydev->irq); | |
0ac49527 | 693 | atomic_inc(&phydev->irq_disable); |
e1393456 AF |
694 | phy_err: |
695 | phy_error(phydev); | |
696 | } | |
697 | ||
b3df0da8 RD |
698 | /** |
699 | * phy_stop - Bring down the PHY link, and stop checking the status | |
700 | * @phydev: target phy_device struct | |
701 | */ | |
e1393456 AF |
702 | void phy_stop(struct phy_device *phydev) |
703 | { | |
35b5f6b1 | 704 | mutex_lock(&phydev->lock); |
e1393456 AF |
705 | |
706 | if (PHY_HALTED == phydev->state) | |
707 | goto out_unlock; | |
708 | ||
3c3070d7 | 709 | if (phydev->irq != PHY_POLL) { |
e1393456 AF |
710 | /* Disable PHY Interrupts */ |
711 | phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
e1393456 | 712 | |
3c3070d7 MR |
713 | /* Clear any pending interrupts */ |
714 | phy_clear_interrupt(phydev); | |
715 | } | |
e1393456 | 716 | |
6daf6531 MR |
717 | phydev->state = PHY_HALTED; |
718 | ||
e1393456 | 719 | out_unlock: |
35b5f6b1 | 720 | mutex_unlock(&phydev->lock); |
3c3070d7 MR |
721 | |
722 | /* | |
723 | * Cannot call flush_scheduled_work() here as desired because | |
724 | * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change() | |
725 | * will not reenable interrupts. | |
726 | */ | |
e1393456 AF |
727 | } |
728 | ||
729 | ||
b3df0da8 RD |
730 | /** |
731 | * phy_start - start or restart a PHY device | |
732 | * @phydev: target phy_device struct | |
e1393456 | 733 | * |
b3df0da8 | 734 | * Description: Indicates the attached device's readiness to |
e1393456 AF |
735 | * handle PHY-related work. Used during startup to start the |
736 | * PHY, and after a call to phy_stop() to resume operation. | |
737 | * Also used to indicate the MDIO bus has cleared an error | |
738 | * condition. | |
739 | */ | |
740 | void phy_start(struct phy_device *phydev) | |
741 | { | |
35b5f6b1 | 742 | mutex_lock(&phydev->lock); |
e1393456 AF |
743 | |
744 | switch (phydev->state) { | |
745 | case PHY_STARTING: | |
746 | phydev->state = PHY_PENDING; | |
747 | break; | |
748 | case PHY_READY: | |
749 | phydev->state = PHY_UP; | |
750 | break; | |
751 | case PHY_HALTED: | |
752 | phydev->state = PHY_RESUMING; | |
753 | default: | |
754 | break; | |
755 | } | |
35b5f6b1 | 756 | mutex_unlock(&phydev->lock); |
e1393456 AF |
757 | } |
758 | EXPORT_SYMBOL(phy_stop); | |
759 | EXPORT_SYMBOL(phy_start); | |
67c4f3fa | 760 | |
35b5f6b1 NC |
761 | /** |
762 | * phy_state_machine - Handle the state machine | |
763 | * @work: work_struct that describes the work to be done | |
764 | * | |
765 | * Description: Scheduled by the state_queue workqueue each time | |
766 | * phy_timer is triggered. | |
767 | */ | |
768 | static void phy_state_machine(struct work_struct *work) | |
00db8189 | 769 | { |
35b5f6b1 NC |
770 | struct phy_device *phydev = |
771 | container_of(work, 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 | |
6b655529 AF |
840 | pr_info("Trying %d/%s\n", phydev->speed, |
841 | DUPLEX_FULL == | |
842 | 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) { | |
931 | phydev->state = PHY_RUNNING; | |
932 | } else { | |
933 | phydev->state = PHY_AN; | |
934 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
935 | } | |
936 | } else | |
937 | phydev->state = PHY_RUNNING; | |
938 | break; | |
939 | } | |
940 | ||
35b5f6b1 | 941 | mutex_unlock(&phydev->lock); |
00db8189 AF |
942 | |
943 | if (needs_aneg) | |
944 | err = phy_start_aneg(phydev); | |
945 | ||
946 | if (err < 0) | |
947 | phy_error(phydev); | |
948 | ||
949 | mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ); | |
950 | } | |
951 | ||
35b5f6b1 NC |
952 | /* PHY timer which schedules the state machine work */ |
953 | static void phy_timer(unsigned long data) | |
954 | { | |
955 | struct phy_device *phydev = (struct phy_device *)data; | |
956 | ||
957 | /* | |
958 | * PHY I/O operations can potentially sleep so we ensure that | |
959 | * it's done from a process context | |
960 | */ | |
961 | schedule_work(&phydev->state_queue); | |
962 | } |