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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. | |
3c3070d7 | 10 | * Copyright (c) 2006 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> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/module.h> | |
00db8189 AF |
32 | #include <linux/mii.h> |
33 | #include <linux/ethtool.h> | |
34 | #include <linux/phy.h> | |
3c3070d7 MR |
35 | #include <linux/timer.h> |
36 | #include <linux/workqueue.h> | |
00db8189 AF |
37 | |
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 | { | |
a4d00f17 | 48 | pr_info("PHY: %s - Link is %s", phydev->dev.bus_id, |
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_read - Convenience function for reading a given PHY register | |
62 | * @phydev: the phy_device struct | |
63 | * @regnum: register number to read | |
64 | * | |
65 | * NOTE: MUST NOT be called from interrupt context, | |
00db8189 | 66 | * because the bus read/write functions may wait for an interrupt |
b3df0da8 RD |
67 | * to conclude the operation. |
68 | */ | |
00db8189 AF |
69 | int phy_read(struct phy_device *phydev, u16 regnum) |
70 | { | |
71 | int retval; | |
72 | struct mii_bus *bus = phydev->bus; | |
73 | ||
74 | spin_lock_bh(&bus->mdio_lock); | |
75 | retval = bus->read(bus, phydev->addr, regnum); | |
76 | spin_unlock_bh(&bus->mdio_lock); | |
77 | ||
78 | return retval; | |
79 | } | |
80 | EXPORT_SYMBOL(phy_read); | |
81 | ||
b3df0da8 RD |
82 | /** |
83 | * phy_write - Convenience function for writing a given PHY register | |
84 | * @phydev: the phy_device struct | |
85 | * @regnum: register number to write | |
86 | * @val: value to write to @regnum | |
87 | * | |
88 | * NOTE: MUST NOT be called from interrupt context, | |
89 | * because the bus read/write functions may wait for an interrupt | |
90 | * to conclude the operation. | |
91 | */ | |
00db8189 AF |
92 | int phy_write(struct phy_device *phydev, u16 regnum, u16 val) |
93 | { | |
94 | int err; | |
95 | struct mii_bus *bus = phydev->bus; | |
96 | ||
97 | spin_lock_bh(&bus->mdio_lock); | |
98 | err = bus->write(bus, phydev->addr, regnum, val); | |
99 | spin_unlock_bh(&bus->mdio_lock); | |
100 | ||
101 | return err; | |
102 | } | |
103 | EXPORT_SYMBOL(phy_write); | |
104 | ||
b3df0da8 RD |
105 | /** |
106 | * phy_clear_interrupt - Ack the phy device's interrupt | |
107 | * @phydev: the phy_device struct | |
108 | * | |
109 | * If the @phydev driver has an ack_interrupt function, call it to | |
110 | * ack and clear the phy device's interrupt. | |
111 | * | |
112 | * Returns 0 on success on < 0 on error. | |
113 | */ | |
00db8189 AF |
114 | int phy_clear_interrupt(struct phy_device *phydev) |
115 | { | |
116 | int err = 0; | |
117 | ||
118 | if (phydev->drv->ack_interrupt) | |
119 | err = phydev->drv->ack_interrupt(phydev); | |
120 | ||
121 | return err; | |
122 | } | |
123 | ||
b3df0da8 RD |
124 | /** |
125 | * phy_config_interrupt - configure the PHY device for the requested interrupts | |
126 | * @phydev: the phy_device struct | |
127 | * @interrupts: interrupt flags to configure for this @phydev | |
128 | * | |
129 | * Returns 0 on success on < 0 on error. | |
130 | */ | |
00db8189 AF |
131 | int phy_config_interrupt(struct phy_device *phydev, u32 interrupts) |
132 | { | |
133 | int err = 0; | |
134 | ||
135 | phydev->interrupts = interrupts; | |
136 | if (phydev->drv->config_intr) | |
137 | err = phydev->drv->config_intr(phydev); | |
138 | ||
139 | return err; | |
140 | } | |
141 | ||
142 | ||
b3df0da8 RD |
143 | /** |
144 | * phy_aneg_done - return auto-negotiation status | |
145 | * @phydev: target phy_device struct | |
00db8189 | 146 | * |
b3df0da8 | 147 | * Description: Reads the status register and returns 0 either if |
00db8189 AF |
148 | * auto-negotiation is incomplete, or if there was an error. |
149 | * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. | |
150 | */ | |
151 | static inline int phy_aneg_done(struct phy_device *phydev) | |
152 | { | |
153 | int retval; | |
154 | ||
155 | retval = phy_read(phydev, MII_BMSR); | |
156 | ||
157 | return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); | |
158 | } | |
159 | ||
00db8189 AF |
160 | /* A structure for mapping a particular speed and duplex |
161 | * combination to a particular SUPPORTED and ADVERTISED value */ | |
162 | struct phy_setting { | |
163 | int speed; | |
164 | int duplex; | |
165 | u32 setting; | |
166 | }; | |
167 | ||
168 | /* A mapping of all SUPPORTED settings to speed/duplex */ | |
f71e1309 | 169 | static const struct phy_setting settings[] = { |
00db8189 AF |
170 | { |
171 | .speed = 10000, | |
172 | .duplex = DUPLEX_FULL, | |
173 | .setting = SUPPORTED_10000baseT_Full, | |
174 | }, | |
175 | { | |
176 | .speed = SPEED_1000, | |
177 | .duplex = DUPLEX_FULL, | |
178 | .setting = SUPPORTED_1000baseT_Full, | |
179 | }, | |
180 | { | |
181 | .speed = SPEED_1000, | |
182 | .duplex = DUPLEX_HALF, | |
183 | .setting = SUPPORTED_1000baseT_Half, | |
184 | }, | |
185 | { | |
186 | .speed = SPEED_100, | |
187 | .duplex = DUPLEX_FULL, | |
188 | .setting = SUPPORTED_100baseT_Full, | |
189 | }, | |
190 | { | |
191 | .speed = SPEED_100, | |
192 | .duplex = DUPLEX_HALF, | |
193 | .setting = SUPPORTED_100baseT_Half, | |
194 | }, | |
195 | { | |
196 | .speed = SPEED_10, | |
197 | .duplex = DUPLEX_FULL, | |
198 | .setting = SUPPORTED_10baseT_Full, | |
199 | }, | |
200 | { | |
201 | .speed = SPEED_10, | |
202 | .duplex = DUPLEX_HALF, | |
203 | .setting = SUPPORTED_10baseT_Half, | |
204 | }, | |
205 | }; | |
206 | ||
ff8ac609 | 207 | #define MAX_NUM_SETTINGS ARRAY_SIZE(settings) |
00db8189 | 208 | |
b3df0da8 RD |
209 | /** |
210 | * phy_find_setting - find a PHY settings array entry that matches speed & duplex | |
211 | * @speed: speed to match | |
212 | * @duplex: duplex to match | |
00db8189 | 213 | * |
b3df0da8 | 214 | * Description: Searches the settings array for the setting which |
00db8189 AF |
215 | * matches the desired speed and duplex, and returns the index |
216 | * of that setting. Returns the index of the last setting if | |
217 | * none of the others match. | |
218 | */ | |
219 | static inline int phy_find_setting(int speed, int duplex) | |
220 | { | |
221 | int idx = 0; | |
222 | ||
223 | while (idx < ARRAY_SIZE(settings) && | |
224 | (settings[idx].speed != speed || | |
225 | settings[idx].duplex != duplex)) | |
226 | idx++; | |
227 | ||
228 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; | |
229 | } | |
230 | ||
b3df0da8 RD |
231 | /** |
232 | * phy_find_valid - find a PHY setting that matches the requested features mask | |
233 | * @idx: The first index in settings[] to search | |
234 | * @features: A mask of the valid settings | |
00db8189 | 235 | * |
b3df0da8 | 236 | * Description: Returns the index of the first valid setting less |
00db8189 AF |
237 | * than or equal to the one pointed to by idx, as determined by |
238 | * the mask in features. Returns the index of the last setting | |
239 | * if nothing else matches. | |
240 | */ | |
241 | static inline int phy_find_valid(int idx, u32 features) | |
242 | { | |
243 | while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features)) | |
244 | idx++; | |
245 | ||
246 | return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; | |
247 | } | |
248 | ||
b3df0da8 RD |
249 | /** |
250 | * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex | |
251 | * @phydev: the target phy_device struct | |
00db8189 | 252 | * |
b3df0da8 | 253 | * Description: Make sure the PHY is set to supported speeds and |
00db8189 | 254 | * duplexes. Drop down by one in this order: 1000/FULL, |
b3df0da8 | 255 | * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. |
00db8189 | 256 | */ |
e1393456 | 257 | void phy_sanitize_settings(struct phy_device *phydev) |
00db8189 AF |
258 | { |
259 | u32 features = phydev->supported; | |
260 | int idx; | |
261 | ||
262 | /* Sanitize settings based on PHY capabilities */ | |
263 | if ((features & SUPPORTED_Autoneg) == 0) | |
163642a2 | 264 | phydev->autoneg = AUTONEG_DISABLE; |
00db8189 AF |
265 | |
266 | idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex), | |
267 | features); | |
268 | ||
269 | phydev->speed = settings[idx].speed; | |
270 | phydev->duplex = settings[idx].duplex; | |
271 | } | |
e1393456 | 272 | EXPORT_SYMBOL(phy_sanitize_settings); |
00db8189 | 273 | |
b3df0da8 RD |
274 | /** |
275 | * phy_ethtool_sset - generic ethtool sset function, handles all the details | |
276 | * @phydev: target phy_device struct | |
277 | * @cmd: ethtool_cmd | |
00db8189 AF |
278 | * |
279 | * A few notes about parameter checking: | |
280 | * - We don't set port or transceiver, so we don't care what they | |
281 | * were set to. | |
282 | * - phy_start_aneg() will make sure forced settings are sane, and | |
283 | * choose the next best ones from the ones selected, so we don't | |
b3df0da8 | 284 | * care if ethtool tries to give us bad values. |
00db8189 AF |
285 | */ |
286 | int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
287 | { | |
288 | if (cmd->phy_address != phydev->addr) | |
289 | return -EINVAL; | |
290 | ||
291 | /* We make sure that we don't pass unsupported | |
292 | * values in to the PHY */ | |
293 | cmd->advertising &= phydev->supported; | |
294 | ||
295 | /* Verify the settings we care about. */ | |
296 | if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) | |
297 | return -EINVAL; | |
298 | ||
299 | if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) | |
300 | return -EINVAL; | |
301 | ||
302 | if (cmd->autoneg == AUTONEG_DISABLE | |
303 | && ((cmd->speed != SPEED_1000 | |
304 | && cmd->speed != SPEED_100 | |
305 | && cmd->speed != SPEED_10) | |
306 | || (cmd->duplex != DUPLEX_HALF | |
307 | && cmd->duplex != DUPLEX_FULL))) | |
308 | return -EINVAL; | |
309 | ||
310 | phydev->autoneg = cmd->autoneg; | |
311 | ||
312 | phydev->speed = cmd->speed; | |
313 | ||
314 | phydev->advertising = cmd->advertising; | |
315 | ||
316 | if (AUTONEG_ENABLE == cmd->autoneg) | |
317 | phydev->advertising |= ADVERTISED_Autoneg; | |
318 | else | |
319 | phydev->advertising &= ~ADVERTISED_Autoneg; | |
320 | ||
321 | phydev->duplex = cmd->duplex; | |
322 | ||
323 | /* Restart the PHY */ | |
324 | phy_start_aneg(phydev); | |
325 | ||
326 | return 0; | |
327 | } | |
9f6d55d0 | 328 | EXPORT_SYMBOL(phy_ethtool_sset); |
00db8189 AF |
329 | |
330 | int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd) | |
331 | { | |
332 | cmd->supported = phydev->supported; | |
333 | ||
334 | cmd->advertising = phydev->advertising; | |
335 | ||
336 | cmd->speed = phydev->speed; | |
337 | cmd->duplex = phydev->duplex; | |
338 | cmd->port = PORT_MII; | |
339 | cmd->phy_address = phydev->addr; | |
340 | cmd->transceiver = XCVR_EXTERNAL; | |
341 | cmd->autoneg = phydev->autoneg; | |
342 | ||
343 | return 0; | |
344 | } | |
9f6d55d0 | 345 | EXPORT_SYMBOL(phy_ethtool_gset); |
00db8189 | 346 | |
b3df0da8 RD |
347 | /** |
348 | * phy_mii_ioctl - generic PHY MII ioctl interface | |
349 | * @phydev: the phy_device struct | |
350 | * @mii_data: MII ioctl data | |
351 | * @cmd: ioctl cmd to execute | |
352 | * | |
353 | * Note that this function is currently incompatible with the | |
00db8189 | 354 | * PHYCONTROL layer. It changes registers without regard to |
b3df0da8 | 355 | * current state. Use at own risk. |
00db8189 AF |
356 | */ |
357 | int phy_mii_ioctl(struct phy_device *phydev, | |
358 | struct mii_ioctl_data *mii_data, int cmd) | |
359 | { | |
360 | u16 val = mii_data->val_in; | |
361 | ||
362 | switch (cmd) { | |
363 | case SIOCGMIIPHY: | |
364 | mii_data->phy_id = phydev->addr; | |
365 | break; | |
366 | case SIOCGMIIREG: | |
367 | mii_data->val_out = phy_read(phydev, mii_data->reg_num); | |
368 | break; | |
369 | ||
370 | case SIOCSMIIREG: | |
371 | if (!capable(CAP_NET_ADMIN)) | |
372 | return -EPERM; | |
373 | ||
374 | if (mii_data->phy_id == phydev->addr) { | |
375 | switch(mii_data->reg_num) { | |
376 | case MII_BMCR: | |
163642a2 | 377 | if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0) |
00db8189 AF |
378 | phydev->autoneg = AUTONEG_DISABLE; |
379 | else | |
380 | phydev->autoneg = AUTONEG_ENABLE; | |
381 | if ((!phydev->autoneg) && (val & BMCR_FULLDPLX)) | |
382 | phydev->duplex = DUPLEX_FULL; | |
383 | else | |
384 | phydev->duplex = DUPLEX_HALF; | |
024a0a3c SL |
385 | if ((!phydev->autoneg) && |
386 | (val & BMCR_SPEED1000)) | |
387 | phydev->speed = SPEED_1000; | |
388 | else if ((!phydev->autoneg) && | |
389 | (val & BMCR_SPEED100)) | |
390 | phydev->speed = SPEED_100; | |
00db8189 AF |
391 | break; |
392 | case MII_ADVERTISE: | |
393 | phydev->advertising = val; | |
394 | break; | |
395 | default: | |
396 | /* do nothing */ | |
397 | break; | |
398 | } | |
399 | } | |
400 | ||
401 | phy_write(phydev, mii_data->reg_num, val); | |
402 | ||
403 | if (mii_data->reg_num == MII_BMCR | |
404 | && val & BMCR_RESET | |
405 | && phydev->drv->config_init) | |
406 | phydev->drv->config_init(phydev); | |
407 | break; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
680e9fe9 | 412 | EXPORT_SYMBOL(phy_mii_ioctl); |
00db8189 | 413 | |
b3df0da8 RD |
414 | /** |
415 | * phy_start_aneg - start auto-negotiation for this PHY device | |
416 | * @phydev: the phy_device struct | |
e1393456 | 417 | * |
b3df0da8 RD |
418 | * Description: Sanitizes the settings (if we're not autonegotiating |
419 | * them), and then calls the driver's config_aneg function. | |
420 | * If the PHYCONTROL Layer is operating, we change the state to | |
421 | * reflect the beginning of Auto-negotiation or forcing. | |
e1393456 AF |
422 | */ |
423 | int phy_start_aneg(struct phy_device *phydev) | |
424 | { | |
425 | int err; | |
426 | ||
9ff8c68b | 427 | spin_lock_bh(&phydev->lock); |
e1393456 AF |
428 | |
429 | if (AUTONEG_DISABLE == phydev->autoneg) | |
430 | phy_sanitize_settings(phydev); | |
431 | ||
432 | err = phydev->drv->config_aneg(phydev); | |
433 | ||
e1393456 AF |
434 | if (err < 0) |
435 | goto out_unlock; | |
436 | ||
437 | if (phydev->state != PHY_HALTED) { | |
438 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
439 | phydev->state = PHY_AN; | |
440 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
441 | } else { | |
442 | phydev->state = PHY_FORCING; | |
443 | phydev->link_timeout = PHY_FORCE_TIMEOUT; | |
444 | } | |
445 | } | |
446 | ||
447 | out_unlock: | |
9ff8c68b | 448 | spin_unlock_bh(&phydev->lock); |
e1393456 AF |
449 | return err; |
450 | } | |
451 | EXPORT_SYMBOL(phy_start_aneg); | |
452 | ||
453 | ||
c4028958 | 454 | static void phy_change(struct work_struct *work); |
e1393456 AF |
455 | static void phy_timer(unsigned long data); |
456 | ||
b3df0da8 RD |
457 | /** |
458 | * phy_start_machine - start PHY state machine tracking | |
459 | * @phydev: the phy_device struct | |
460 | * @handler: callback function for state change notifications | |
00db8189 | 461 | * |
b3df0da8 | 462 | * Description: The PHY infrastructure can run a state machine |
00db8189 AF |
463 | * which tracks whether the PHY is starting up, negotiating, |
464 | * etc. This function starts the timer which tracks the state | |
b3df0da8 RD |
465 | * of the PHY. If you want to be notified when the state changes, |
466 | * pass in the callback @handler, otherwise, pass NULL. If you | |
00db8189 | 467 | * want to maintain your own state machine, do not call this |
b3df0da8 RD |
468 | * function. |
469 | */ | |
00db8189 AF |
470 | void phy_start_machine(struct phy_device *phydev, |
471 | void (*handler)(struct net_device *)) | |
472 | { | |
473 | phydev->adjust_state = handler; | |
474 | ||
475 | init_timer(&phydev->phy_timer); | |
476 | phydev->phy_timer.function = &phy_timer; | |
477 | phydev->phy_timer.data = (unsigned long) phydev; | |
478 | mod_timer(&phydev->phy_timer, jiffies + HZ); | |
479 | } | |
480 | ||
b3df0da8 RD |
481 | /** |
482 | * phy_stop_machine - stop the PHY state machine tracking | |
483 | * @phydev: target phy_device struct | |
00db8189 | 484 | * |
b3df0da8 | 485 | * Description: Stops the state machine timer, sets the state to UP |
817acf5e | 486 | * (unless it wasn't up yet). This function must be called BEFORE |
00db8189 AF |
487 | * phy_detach. |
488 | */ | |
489 | void phy_stop_machine(struct phy_device *phydev) | |
490 | { | |
491 | del_timer_sync(&phydev->phy_timer); | |
492 | ||
9ff8c68b | 493 | spin_lock_bh(&phydev->lock); |
00db8189 AF |
494 | if (phydev->state > PHY_UP) |
495 | phydev->state = PHY_UP; | |
9ff8c68b | 496 | spin_unlock_bh(&phydev->lock); |
00db8189 | 497 | |
00db8189 AF |
498 | phydev->adjust_state = NULL; |
499 | } | |
500 | ||
b3df0da8 RD |
501 | /** |
502 | * phy_force_reduction - reduce PHY speed/duplex settings by one step | |
503 | * @phydev: target phy_device struct | |
e1393456 | 504 | * |
b3df0da8 RD |
505 | * Description: Reduces the speed/duplex settings by one notch, |
506 | * in this order-- | |
507 | * 1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. | |
508 | * The function bottoms out at 10/HALF. | |
e1393456 AF |
509 | */ |
510 | static void phy_force_reduction(struct phy_device *phydev) | |
511 | { | |
512 | int idx; | |
513 | ||
514 | idx = phy_find_setting(phydev->speed, phydev->duplex); | |
515 | ||
516 | idx++; | |
517 | ||
518 | idx = phy_find_valid(idx, phydev->supported); | |
519 | ||
520 | phydev->speed = settings[idx].speed; | |
521 | phydev->duplex = settings[idx].duplex; | |
522 | ||
523 | pr_info("Trying %d/%s\n", phydev->speed, | |
524 | DUPLEX_FULL == phydev->duplex ? | |
525 | "FULL" : "HALF"); | |
526 | } | |
527 | ||
528 | ||
b3df0da8 RD |
529 | /** |
530 | * phy_error - enter HALTED state for this PHY device | |
531 | * @phydev: target phy_device struct | |
00db8189 AF |
532 | * |
533 | * Moves the PHY to the HALTED state in response to a read | |
534 | * or write error, and tells the controller the link is down. | |
535 | * Must not be called from interrupt context, or while the | |
536 | * phydev->lock is held. | |
537 | */ | |
538 | void phy_error(struct phy_device *phydev) | |
539 | { | |
9ff8c68b | 540 | spin_lock_bh(&phydev->lock); |
00db8189 | 541 | phydev->state = PHY_HALTED; |
9ff8c68b | 542 | spin_unlock_bh(&phydev->lock); |
00db8189 AF |
543 | } |
544 | ||
b3df0da8 RD |
545 | /** |
546 | * phy_interrupt - PHY interrupt handler | |
547 | * @irq: interrupt line | |
548 | * @phy_dat: phy_device pointer | |
e1393456 | 549 | * |
b3df0da8 | 550 | * Description: When a PHY interrupt occurs, the handler disables |
e1393456 AF |
551 | * interrupts, and schedules a work task to clear the interrupt. |
552 | */ | |
7d12e780 | 553 | static irqreturn_t phy_interrupt(int irq, void *phy_dat) |
e1393456 AF |
554 | { |
555 | struct phy_device *phydev = phy_dat; | |
556 | ||
3c3070d7 MR |
557 | if (PHY_HALTED == phydev->state) |
558 | return IRQ_NONE; /* It can't be ours. */ | |
559 | ||
e1393456 AF |
560 | /* The MDIO bus is not allowed to be written in interrupt |
561 | * context, so we need to disable the irq here. A work | |
562 | * queue will write the PHY to disable and clear the | |
563 | * interrupt, and then reenable the irq line. */ | |
564 | disable_irq_nosync(irq); | |
565 | ||
566 | schedule_work(&phydev->phy_queue); | |
567 | ||
568 | return IRQ_HANDLED; | |
569 | } | |
570 | ||
b3df0da8 RD |
571 | /** |
572 | * phy_enable_interrupts - Enable the interrupts from the PHY side | |
573 | * @phydev: target phy_device struct | |
574 | */ | |
e1393456 | 575 | int phy_enable_interrupts(struct phy_device *phydev) |
00db8189 AF |
576 | { |
577 | int err; | |
578 | ||
e1393456 | 579 | err = phy_clear_interrupt(phydev); |
00db8189 | 580 | |
e1393456 AF |
581 | if (err < 0) |
582 | return err; | |
00db8189 | 583 | |
e1393456 | 584 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); |
00db8189 AF |
585 | |
586 | return err; | |
587 | } | |
e1393456 | 588 | EXPORT_SYMBOL(phy_enable_interrupts); |
00db8189 | 589 | |
b3df0da8 RD |
590 | /** |
591 | * phy_disable_interrupts - Disable the PHY interrupts from the PHY side | |
592 | * @phydev: target phy_device struct | |
593 | */ | |
e1393456 | 594 | int phy_disable_interrupts(struct phy_device *phydev) |
00db8189 AF |
595 | { |
596 | int err; | |
597 | ||
598 | /* Disable PHY interrupts */ | |
599 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
600 | ||
601 | if (err) | |
602 | goto phy_err; | |
603 | ||
604 | /* Clear the interrupt */ | |
605 | err = phy_clear_interrupt(phydev); | |
606 | ||
607 | if (err) | |
608 | goto phy_err; | |
609 | ||
610 | return 0; | |
611 | ||
612 | phy_err: | |
613 | phy_error(phydev); | |
614 | ||
615 | return err; | |
616 | } | |
e1393456 AF |
617 | EXPORT_SYMBOL(phy_disable_interrupts); |
618 | ||
b3df0da8 RD |
619 | /** |
620 | * phy_start_interrupts - request and enable interrupts for a PHY device | |
621 | * @phydev: target phy_device struct | |
e1393456 | 622 | * |
b3df0da8 RD |
623 | * Description: Request the interrupt for the given PHY. |
624 | * If this fails, then we set irq to PHY_POLL. | |
e1393456 | 625 | * Otherwise, we enable the interrupts in the PHY. |
e1393456 | 626 | * This should only be called with a valid IRQ number. |
b3df0da8 | 627 | * Returns 0 on success or < 0 on error. |
e1393456 AF |
628 | */ |
629 | int phy_start_interrupts(struct phy_device *phydev) | |
630 | { | |
631 | int err = 0; | |
632 | ||
c4028958 | 633 | INIT_WORK(&phydev->phy_queue, phy_change); |
e1393456 AF |
634 | |
635 | if (request_irq(phydev->irq, phy_interrupt, | |
1fb9df5d | 636 | IRQF_SHARED, |
e1393456 AF |
637 | "phy_interrupt", |
638 | phydev) < 0) { | |
639 | printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n", | |
640 | phydev->bus->name, | |
641 | phydev->irq); | |
642 | phydev->irq = PHY_POLL; | |
643 | return 0; | |
644 | } | |
645 | ||
646 | err = phy_enable_interrupts(phydev); | |
647 | ||
648 | return err; | |
649 | } | |
650 | EXPORT_SYMBOL(phy_start_interrupts); | |
651 | ||
b3df0da8 RD |
652 | /** |
653 | * phy_stop_interrupts - disable interrupts from a PHY device | |
654 | * @phydev: target phy_device struct | |
655 | */ | |
e1393456 AF |
656 | int phy_stop_interrupts(struct phy_device *phydev) |
657 | { | |
658 | int err; | |
659 | ||
660 | err = phy_disable_interrupts(phydev); | |
661 | ||
662 | if (err) | |
663 | phy_error(phydev); | |
664 | ||
3c3070d7 | 665 | /* |
d0758bc3 | 666 | * Finish any pending work; we might have been scheduled to be called |
28e53bdd | 667 | * from keventd ourselves, but cancel_work_sync() handles that. |
3c3070d7 | 668 | */ |
28e53bdd | 669 | cancel_work_sync(&phydev->phy_queue); |
3c3070d7 | 670 | |
e1393456 AF |
671 | free_irq(phydev->irq, phydev); |
672 | ||
673 | return err; | |
674 | } | |
675 | EXPORT_SYMBOL(phy_stop_interrupts); | |
676 | ||
677 | ||
b3df0da8 RD |
678 | /** |
679 | * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes | |
680 | * @work: work_struct that describes the work to be done | |
681 | */ | |
c4028958 | 682 | static void phy_change(struct work_struct *work) |
e1393456 AF |
683 | { |
684 | int err; | |
c4028958 DH |
685 | struct phy_device *phydev = |
686 | container_of(work, struct phy_device, phy_queue); | |
e1393456 AF |
687 | |
688 | err = phy_disable_interrupts(phydev); | |
689 | ||
690 | if (err) | |
691 | goto phy_err; | |
692 | ||
9ff8c68b | 693 | spin_lock_bh(&phydev->lock); |
e1393456 AF |
694 | if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state)) |
695 | phydev->state = PHY_CHANGELINK; | |
9ff8c68b | 696 | spin_unlock_bh(&phydev->lock); |
e1393456 AF |
697 | |
698 | enable_irq(phydev->irq); | |
699 | ||
700 | /* Reenable interrupts */ | |
3c3070d7 MR |
701 | if (PHY_HALTED != phydev->state) |
702 | err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); | |
e1393456 AF |
703 | |
704 | if (err) | |
705 | goto irq_enable_err; | |
706 | ||
707 | return; | |
708 | ||
709 | irq_enable_err: | |
710 | disable_irq(phydev->irq); | |
711 | phy_err: | |
712 | phy_error(phydev); | |
713 | } | |
714 | ||
b3df0da8 RD |
715 | /** |
716 | * phy_stop - Bring down the PHY link, and stop checking the status | |
717 | * @phydev: target phy_device struct | |
718 | */ | |
e1393456 AF |
719 | void phy_stop(struct phy_device *phydev) |
720 | { | |
9ff8c68b | 721 | spin_lock_bh(&phydev->lock); |
e1393456 AF |
722 | |
723 | if (PHY_HALTED == phydev->state) | |
724 | goto out_unlock; | |
725 | ||
3c3070d7 | 726 | phydev->state = PHY_HALTED; |
e1393456 | 727 | |
3c3070d7 | 728 | if (phydev->irq != PHY_POLL) { |
e1393456 AF |
729 | /* Disable PHY Interrupts */ |
730 | phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); | |
e1393456 | 731 | |
3c3070d7 MR |
732 | /* Clear any pending interrupts */ |
733 | phy_clear_interrupt(phydev); | |
734 | } | |
e1393456 AF |
735 | |
736 | out_unlock: | |
9ff8c68b | 737 | spin_unlock_bh(&phydev->lock); |
3c3070d7 MR |
738 | |
739 | /* | |
740 | * Cannot call flush_scheduled_work() here as desired because | |
741 | * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change() | |
742 | * will not reenable interrupts. | |
743 | */ | |
e1393456 AF |
744 | } |
745 | ||
746 | ||
b3df0da8 RD |
747 | /** |
748 | * phy_start - start or restart a PHY device | |
749 | * @phydev: target phy_device struct | |
e1393456 | 750 | * |
b3df0da8 | 751 | * Description: Indicates the attached device's readiness to |
e1393456 AF |
752 | * handle PHY-related work. Used during startup to start the |
753 | * PHY, and after a call to phy_stop() to resume operation. | |
754 | * Also used to indicate the MDIO bus has cleared an error | |
755 | * condition. | |
756 | */ | |
757 | void phy_start(struct phy_device *phydev) | |
758 | { | |
026d7917 | 759 | spin_lock_bh(&phydev->lock); |
e1393456 AF |
760 | |
761 | switch (phydev->state) { | |
762 | case PHY_STARTING: | |
763 | phydev->state = PHY_PENDING; | |
764 | break; | |
765 | case PHY_READY: | |
766 | phydev->state = PHY_UP; | |
767 | break; | |
768 | case PHY_HALTED: | |
769 | phydev->state = PHY_RESUMING; | |
770 | default: | |
771 | break; | |
772 | } | |
026d7917 | 773 | spin_unlock_bh(&phydev->lock); |
e1393456 AF |
774 | } |
775 | EXPORT_SYMBOL(phy_stop); | |
776 | EXPORT_SYMBOL(phy_start); | |
67c4f3fa | 777 | |
00db8189 AF |
778 | /* PHY timer which handles the state machine */ |
779 | static void phy_timer(unsigned long data) | |
780 | { | |
781 | struct phy_device *phydev = (struct phy_device *)data; | |
782 | int needs_aneg = 0; | |
783 | int err = 0; | |
784 | ||
9ff8c68b | 785 | spin_lock_bh(&phydev->lock); |
00db8189 AF |
786 | |
787 | if (phydev->adjust_state) | |
788 | phydev->adjust_state(phydev->attached_dev); | |
789 | ||
790 | switch(phydev->state) { | |
791 | case PHY_DOWN: | |
792 | case PHY_STARTING: | |
793 | case PHY_READY: | |
794 | case PHY_PENDING: | |
795 | break; | |
796 | case PHY_UP: | |
797 | needs_aneg = 1; | |
798 | ||
799 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
800 | ||
801 | break; | |
802 | case PHY_AN: | |
6b655529 AF |
803 | err = phy_read_status(phydev); |
804 | ||
805 | if (err < 0) | |
806 | break; | |
807 | ||
808 | /* If the link is down, give up on | |
809 | * negotiation for now */ | |
810 | if (!phydev->link) { | |
811 | phydev->state = PHY_NOLINK; | |
812 | netif_carrier_off(phydev->attached_dev); | |
813 | phydev->adjust_link(phydev->attached_dev); | |
814 | break; | |
815 | } | |
816 | ||
00db8189 AF |
817 | /* Check if negotiation is done. Break |
818 | * if there's an error */ | |
819 | err = phy_aneg_done(phydev); | |
820 | if (err < 0) | |
821 | break; | |
822 | ||
6b655529 | 823 | /* If AN is done, we're running */ |
00db8189 | 824 | if (err > 0) { |
6b655529 AF |
825 | phydev->state = PHY_RUNNING; |
826 | netif_carrier_on(phydev->attached_dev); | |
827 | phydev->adjust_link(phydev->attached_dev); | |
00db8189 | 828 | |
6b655529 AF |
829 | } else if (0 == phydev->link_timeout--) { |
830 | int idx; | |
00db8189 | 831 | |
6b655529 AF |
832 | needs_aneg = 1; |
833 | /* If we have the magic_aneg bit, | |
834 | * we try again */ | |
835 | if (phydev->drv->flags & PHY_HAS_MAGICANEG) | |
00db8189 AF |
836 | break; |
837 | ||
6b655529 AF |
838 | /* The timer expired, and we still |
839 | * don't have a setting, so we try | |
840 | * forcing it until we find one that | |
841 | * works, starting from the fastest speed, | |
842 | * and working our way down */ | |
843 | idx = phy_find_valid(0, phydev->supported); | |
00db8189 | 844 | |
6b655529 AF |
845 | phydev->speed = settings[idx].speed; |
846 | phydev->duplex = settings[idx].duplex; | |
00db8189 | 847 | |
6b655529 | 848 | phydev->autoneg = AUTONEG_DISABLE; |
00db8189 | 849 | |
6b655529 AF |
850 | pr_info("Trying %d/%s\n", phydev->speed, |
851 | DUPLEX_FULL == | |
852 | phydev->duplex ? | |
853 | "FULL" : "HALF"); | |
00db8189 AF |
854 | } |
855 | break; | |
856 | case PHY_NOLINK: | |
857 | err = phy_read_status(phydev); | |
858 | ||
859 | if (err) | |
860 | break; | |
861 | ||
862 | if (phydev->link) { | |
863 | phydev->state = PHY_RUNNING; | |
864 | netif_carrier_on(phydev->attached_dev); | |
865 | phydev->adjust_link(phydev->attached_dev); | |
866 | } | |
867 | break; | |
868 | case PHY_FORCING: | |
6b655529 | 869 | err = genphy_update_link(phydev); |
00db8189 AF |
870 | |
871 | if (err) | |
872 | break; | |
873 | ||
874 | if (phydev->link) { | |
875 | phydev->state = PHY_RUNNING; | |
876 | netif_carrier_on(phydev->attached_dev); | |
877 | } else { | |
878 | if (0 == phydev->link_timeout--) { | |
879 | phy_force_reduction(phydev); | |
880 | needs_aneg = 1; | |
881 | } | |
882 | } | |
883 | ||
884 | phydev->adjust_link(phydev->attached_dev); | |
885 | break; | |
886 | case PHY_RUNNING: | |
887 | /* Only register a CHANGE if we are | |
888 | * polling */ | |
889 | if (PHY_POLL == phydev->irq) | |
890 | phydev->state = PHY_CHANGELINK; | |
891 | break; | |
892 | case PHY_CHANGELINK: | |
893 | err = phy_read_status(phydev); | |
894 | ||
895 | if (err) | |
896 | break; | |
897 | ||
898 | if (phydev->link) { | |
899 | phydev->state = PHY_RUNNING; | |
900 | netif_carrier_on(phydev->attached_dev); | |
901 | } else { | |
902 | phydev->state = PHY_NOLINK; | |
903 | netif_carrier_off(phydev->attached_dev); | |
904 | } | |
905 | ||
906 | phydev->adjust_link(phydev->attached_dev); | |
907 | ||
908 | if (PHY_POLL != phydev->irq) | |
909 | err = phy_config_interrupt(phydev, | |
910 | PHY_INTERRUPT_ENABLED); | |
911 | break; | |
912 | case PHY_HALTED: | |
913 | if (phydev->link) { | |
914 | phydev->link = 0; | |
915 | netif_carrier_off(phydev->attached_dev); | |
916 | phydev->adjust_link(phydev->attached_dev); | |
917 | } | |
918 | break; | |
919 | case PHY_RESUMING: | |
920 | ||
921 | err = phy_clear_interrupt(phydev); | |
922 | ||
923 | if (err) | |
924 | break; | |
925 | ||
926 | err = phy_config_interrupt(phydev, | |
927 | PHY_INTERRUPT_ENABLED); | |
928 | ||
929 | if (err) | |
930 | break; | |
931 | ||
932 | if (AUTONEG_ENABLE == phydev->autoneg) { | |
933 | err = phy_aneg_done(phydev); | |
934 | if (err < 0) | |
935 | break; | |
936 | ||
937 | /* err > 0 if AN is done. | |
938 | * Otherwise, it's 0, and we're | |
939 | * still waiting for AN */ | |
940 | if (err > 0) { | |
941 | phydev->state = PHY_RUNNING; | |
942 | } else { | |
943 | phydev->state = PHY_AN; | |
944 | phydev->link_timeout = PHY_AN_TIMEOUT; | |
945 | } | |
946 | } else | |
947 | phydev->state = PHY_RUNNING; | |
948 | break; | |
949 | } | |
950 | ||
9ff8c68b | 951 | spin_unlock_bh(&phydev->lock); |
00db8189 AF |
952 | |
953 | if (needs_aneg) | |
954 | err = phy_start_aneg(phydev); | |
955 | ||
956 | if (err < 0) | |
957 | phy_error(phydev); | |
958 | ||
959 | mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ); | |
960 | } | |
961 |