1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Core PHY library, taken from phy.c
4 */
5 #include <linux/export.h>
6 #include <linux/phy.h>
7 #include <linux/of.h>
8
9 /**
10 * phy_speed_to_str - Return a string representing the PHY link speed
11 *
12 * @speed: Speed of the link
13 */
phy_speed_to_str(int speed)14 const char *phy_speed_to_str(int speed)
15 {
16 BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 92,
17 "Enum ethtool_link_mode_bit_indices and phylib are out of sync. "
18 "If a speed or mode has been added please update phy_speed_to_str "
19 "and the PHY settings array.\n");
20
21 switch (speed) {
22 case SPEED_10:
23 return "10Mbps";
24 case SPEED_100:
25 return "100Mbps";
26 case SPEED_1000:
27 return "1Gbps";
28 case SPEED_2500:
29 return "2.5Gbps";
30 case SPEED_5000:
31 return "5Gbps";
32 case SPEED_10000:
33 return "10Gbps";
34 case SPEED_14000:
35 return "14Gbps";
36 case SPEED_20000:
37 return "20Gbps";
38 case SPEED_25000:
39 return "25Gbps";
40 case SPEED_40000:
41 return "40Gbps";
42 case SPEED_50000:
43 return "50Gbps";
44 case SPEED_56000:
45 return "56Gbps";
46 case SPEED_100000:
47 return "100Gbps";
48 case SPEED_200000:
49 return "200Gbps";
50 case SPEED_400000:
51 return "400Gbps";
52 case SPEED_UNKNOWN:
53 return "Unknown";
54 default:
55 return "Unsupported (update phy-core.c)";
56 }
57 }
58 EXPORT_SYMBOL_GPL(phy_speed_to_str);
59
60 /**
61 * phy_duplex_to_str - Return string describing the duplex
62 *
63 * @duplex: Duplex setting to describe
64 */
phy_duplex_to_str(unsigned int duplex)65 const char *phy_duplex_to_str(unsigned int duplex)
66 {
67 if (duplex == DUPLEX_HALF)
68 return "Half";
69 if (duplex == DUPLEX_FULL)
70 return "Full";
71 if (duplex == DUPLEX_UNKNOWN)
72 return "Unknown";
73 return "Unsupported (update phy-core.c)";
74 }
75 EXPORT_SYMBOL_GPL(phy_duplex_to_str);
76
77 /* A mapping of all SUPPORTED settings to speed/duplex. This table
78 * must be grouped by speed and sorted in descending match priority
79 * - iow, descending speed.
80 */
81
82 #define PHY_SETTING(s, d, b) { .speed = SPEED_ ## s, .duplex = DUPLEX_ ## d, \
83 .bit = ETHTOOL_LINK_MODE_ ## b ## _BIT}
84
85 static const struct phy_setting settings[] = {
86 /* 400G */
87 PHY_SETTING( 400000, FULL, 400000baseCR8_Full ),
88 PHY_SETTING( 400000, FULL, 400000baseKR8_Full ),
89 PHY_SETTING( 400000, FULL, 400000baseLR8_ER8_FR8_Full ),
90 PHY_SETTING( 400000, FULL, 400000baseDR8_Full ),
91 PHY_SETTING( 400000, FULL, 400000baseSR8_Full ),
92 PHY_SETTING( 400000, FULL, 400000baseCR4_Full ),
93 PHY_SETTING( 400000, FULL, 400000baseKR4_Full ),
94 PHY_SETTING( 400000, FULL, 400000baseLR4_ER4_FR4_Full ),
95 PHY_SETTING( 400000, FULL, 400000baseDR4_Full ),
96 PHY_SETTING( 400000, FULL, 400000baseSR4_Full ),
97 /* 200G */
98 PHY_SETTING( 200000, FULL, 200000baseCR4_Full ),
99 PHY_SETTING( 200000, FULL, 200000baseKR4_Full ),
100 PHY_SETTING( 200000, FULL, 200000baseLR4_ER4_FR4_Full ),
101 PHY_SETTING( 200000, FULL, 200000baseDR4_Full ),
102 PHY_SETTING( 200000, FULL, 200000baseSR4_Full ),
103 PHY_SETTING( 200000, FULL, 200000baseCR2_Full ),
104 PHY_SETTING( 200000, FULL, 200000baseKR2_Full ),
105 PHY_SETTING( 200000, FULL, 200000baseLR2_ER2_FR2_Full ),
106 PHY_SETTING( 200000, FULL, 200000baseDR2_Full ),
107 PHY_SETTING( 200000, FULL, 200000baseSR2_Full ),
108 /* 100G */
109 PHY_SETTING( 100000, FULL, 100000baseCR4_Full ),
110 PHY_SETTING( 100000, FULL, 100000baseKR4_Full ),
111 PHY_SETTING( 100000, FULL, 100000baseLR4_ER4_Full ),
112 PHY_SETTING( 100000, FULL, 100000baseSR4_Full ),
113 PHY_SETTING( 100000, FULL, 100000baseCR2_Full ),
114 PHY_SETTING( 100000, FULL, 100000baseKR2_Full ),
115 PHY_SETTING( 100000, FULL, 100000baseLR2_ER2_FR2_Full ),
116 PHY_SETTING( 100000, FULL, 100000baseDR2_Full ),
117 PHY_SETTING( 100000, FULL, 100000baseSR2_Full ),
118 PHY_SETTING( 100000, FULL, 100000baseCR_Full ),
119 PHY_SETTING( 100000, FULL, 100000baseKR_Full ),
120 PHY_SETTING( 100000, FULL, 100000baseLR_ER_FR_Full ),
121 PHY_SETTING( 100000, FULL, 100000baseDR_Full ),
122 PHY_SETTING( 100000, FULL, 100000baseSR_Full ),
123 /* 56G */
124 PHY_SETTING( 56000, FULL, 56000baseCR4_Full ),
125 PHY_SETTING( 56000, FULL, 56000baseKR4_Full ),
126 PHY_SETTING( 56000, FULL, 56000baseLR4_Full ),
127 PHY_SETTING( 56000, FULL, 56000baseSR4_Full ),
128 /* 50G */
129 PHY_SETTING( 50000, FULL, 50000baseCR2_Full ),
130 PHY_SETTING( 50000, FULL, 50000baseKR2_Full ),
131 PHY_SETTING( 50000, FULL, 50000baseSR2_Full ),
132 PHY_SETTING( 50000, FULL, 50000baseCR_Full ),
133 PHY_SETTING( 50000, FULL, 50000baseKR_Full ),
134 PHY_SETTING( 50000, FULL, 50000baseLR_ER_FR_Full ),
135 PHY_SETTING( 50000, FULL, 50000baseDR_Full ),
136 PHY_SETTING( 50000, FULL, 50000baseSR_Full ),
137 /* 40G */
138 PHY_SETTING( 40000, FULL, 40000baseCR4_Full ),
139 PHY_SETTING( 40000, FULL, 40000baseKR4_Full ),
140 PHY_SETTING( 40000, FULL, 40000baseLR4_Full ),
141 PHY_SETTING( 40000, FULL, 40000baseSR4_Full ),
142 /* 25G */
143 PHY_SETTING( 25000, FULL, 25000baseCR_Full ),
144 PHY_SETTING( 25000, FULL, 25000baseKR_Full ),
145 PHY_SETTING( 25000, FULL, 25000baseSR_Full ),
146 /* 20G */
147 PHY_SETTING( 20000, FULL, 20000baseKR2_Full ),
148 PHY_SETTING( 20000, FULL, 20000baseMLD2_Full ),
149 /* 10G */
150 PHY_SETTING( 10000, FULL, 10000baseCR_Full ),
151 PHY_SETTING( 10000, FULL, 10000baseER_Full ),
152 PHY_SETTING( 10000, FULL, 10000baseKR_Full ),
153 PHY_SETTING( 10000, FULL, 10000baseKX4_Full ),
154 PHY_SETTING( 10000, FULL, 10000baseLR_Full ),
155 PHY_SETTING( 10000, FULL, 10000baseLRM_Full ),
156 PHY_SETTING( 10000, FULL, 10000baseR_FEC ),
157 PHY_SETTING( 10000, FULL, 10000baseSR_Full ),
158 PHY_SETTING( 10000, FULL, 10000baseT_Full ),
159 /* 5G */
160 PHY_SETTING( 5000, FULL, 5000baseT_Full ),
161 /* 2.5G */
162 PHY_SETTING( 2500, FULL, 2500baseT_Full ),
163 PHY_SETTING( 2500, FULL, 2500baseX_Full ),
164 /* 1G */
165 PHY_SETTING( 1000, FULL, 1000baseKX_Full ),
166 PHY_SETTING( 1000, FULL, 1000baseT_Full ),
167 PHY_SETTING( 1000, HALF, 1000baseT_Half ),
168 PHY_SETTING( 1000, FULL, 1000baseT1_Full ),
169 PHY_SETTING( 1000, FULL, 1000baseX_Full ),
170 /* 100M */
171 PHY_SETTING( 100, FULL, 100baseT_Full ),
172 PHY_SETTING( 100, FULL, 100baseT1_Full ),
173 PHY_SETTING( 100, HALF, 100baseT_Half ),
174 PHY_SETTING( 100, HALF, 100baseFX_Half ),
175 PHY_SETTING( 100, FULL, 100baseFX_Full ),
176 /* 10M */
177 PHY_SETTING( 10, FULL, 10baseT_Full ),
178 PHY_SETTING( 10, HALF, 10baseT_Half ),
179 };
180 #undef PHY_SETTING
181
182 /**
183 * phy_lookup_setting - lookup a PHY setting
184 * @speed: speed to match
185 * @duplex: duplex to match
186 * @mask: allowed link modes
187 * @exact: an exact match is required
188 *
189 * Search the settings array for a setting that matches the speed and
190 * duplex, and which is supported.
191 *
192 * If @exact is unset, either an exact match or %NULL for no match will
193 * be returned.
194 *
195 * If @exact is set, an exact match, the fastest supported setting at
196 * or below the specified speed, the slowest supported setting, or if
197 * they all fail, %NULL will be returned.
198 */
199 const struct phy_setting *
phy_lookup_setting(int speed,int duplex,const unsigned long * mask,bool exact)200 phy_lookup_setting(int speed, int duplex, const unsigned long *mask, bool exact)
201 {
202 const struct phy_setting *p, *match = NULL, *last = NULL;
203 int i;
204
205 for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
206 if (p->bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
207 test_bit(p->bit, mask)) {
208 last = p;
209 if (p->speed == speed && p->duplex == duplex) {
210 /* Exact match for speed and duplex */
211 match = p;
212 break;
213 } else if (!exact) {
214 if (!match && p->speed <= speed)
215 /* Candidate */
216 match = p;
217
218 if (p->speed < speed)
219 break;
220 }
221 }
222 }
223
224 if (!match && !exact)
225 match = last;
226
227 return match;
228 }
229 EXPORT_SYMBOL_GPL(phy_lookup_setting);
230
phy_speeds(unsigned int * speeds,size_t size,unsigned long * mask)231 size_t phy_speeds(unsigned int *speeds, size_t size,
232 unsigned long *mask)
233 {
234 size_t count;
235 int i;
236
237 for (i = 0, count = 0; i < ARRAY_SIZE(settings) && count < size; i++)
238 if (settings[i].bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
239 test_bit(settings[i].bit, mask) &&
240 (count == 0 || speeds[count - 1] != settings[i].speed))
241 speeds[count++] = settings[i].speed;
242
243 return count;
244 }
245
__set_linkmode_max_speed(u32 max_speed,unsigned long * addr)246 static int __set_linkmode_max_speed(u32 max_speed, unsigned long *addr)
247 {
248 const struct phy_setting *p;
249 int i;
250
251 for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
252 if (p->speed > max_speed)
253 linkmode_clear_bit(p->bit, addr);
254 else
255 break;
256 }
257
258 return 0;
259 }
260
__set_phy_supported(struct phy_device * phydev,u32 max_speed)261 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed)
262 {
263 return __set_linkmode_max_speed(max_speed, phydev->supported);
264 }
265
266 /**
267 * phy_set_max_speed - Set the maximum speed the PHY should support
268 *
269 * @phydev: The phy_device struct
270 * @max_speed: Maximum speed
271 *
272 * The PHY might be more capable than the MAC. For example a Fast Ethernet
273 * is connected to a 1G PHY. This function allows the MAC to indicate its
274 * maximum speed, and so limit what the PHY will advertise.
275 */
phy_set_max_speed(struct phy_device * phydev,u32 max_speed)276 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed)
277 {
278 int err;
279
280 err = __set_phy_supported(phydev, max_speed);
281 if (err)
282 return err;
283
284 phy_advertise_supported(phydev);
285
286 return 0;
287 }
288 EXPORT_SYMBOL(phy_set_max_speed);
289
of_set_phy_supported(struct phy_device * phydev)290 void of_set_phy_supported(struct phy_device *phydev)
291 {
292 struct device_node *node = phydev->mdio.dev.of_node;
293 u32 max_speed;
294
295 if (!IS_ENABLED(CONFIG_OF_MDIO))
296 return;
297
298 if (!node)
299 return;
300
301 if (!of_property_read_u32(node, "max-speed", &max_speed))
302 __set_phy_supported(phydev, max_speed);
303 }
304
of_set_phy_eee_broken(struct phy_device * phydev)305 void of_set_phy_eee_broken(struct phy_device *phydev)
306 {
307 struct device_node *node = phydev->mdio.dev.of_node;
308 u32 broken = 0;
309
310 if (!IS_ENABLED(CONFIG_OF_MDIO))
311 return;
312
313 if (!node)
314 return;
315
316 if (of_property_read_bool(node, "eee-broken-100tx"))
317 broken |= MDIO_EEE_100TX;
318 if (of_property_read_bool(node, "eee-broken-1000t"))
319 broken |= MDIO_EEE_1000T;
320 if (of_property_read_bool(node, "eee-broken-10gt"))
321 broken |= MDIO_EEE_10GT;
322 if (of_property_read_bool(node, "eee-broken-1000kx"))
323 broken |= MDIO_EEE_1000KX;
324 if (of_property_read_bool(node, "eee-broken-10gkx4"))
325 broken |= MDIO_EEE_10GKX4;
326 if (of_property_read_bool(node, "eee-broken-10gkr"))
327 broken |= MDIO_EEE_10GKR;
328
329 phydev->eee_broken_modes = broken;
330 }
331
332 /**
333 * phy_resolve_aneg_pause - Determine pause autoneg results
334 *
335 * @phydev: The phy_device struct
336 *
337 * Once autoneg has completed the local pause settings can be
338 * resolved. Determine if pause and asymmetric pause should be used
339 * by the MAC.
340 */
341
phy_resolve_aneg_pause(struct phy_device * phydev)342 void phy_resolve_aneg_pause(struct phy_device *phydev)
343 {
344 if (phydev->duplex == DUPLEX_FULL) {
345 phydev->pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
346 phydev->lp_advertising);
347 phydev->asym_pause = linkmode_test_bit(
348 ETHTOOL_LINK_MODE_Asym_Pause_BIT,
349 phydev->lp_advertising);
350 }
351 }
352 EXPORT_SYMBOL_GPL(phy_resolve_aneg_pause);
353
354 /**
355 * phy_resolve_aneg_linkmode - resolve the advertisements into PHY settings
356 * @phydev: The phy_device struct
357 *
358 * Resolve our and the link partner advertisements into their corresponding
359 * speed and duplex. If full duplex was negotiated, extract the pause mode
360 * from the link partner mask.
361 */
phy_resolve_aneg_linkmode(struct phy_device * phydev)362 void phy_resolve_aneg_linkmode(struct phy_device *phydev)
363 {
364 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
365 int i;
366
367 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
368
369 for (i = 0; i < ARRAY_SIZE(settings); i++)
370 if (test_bit(settings[i].bit, common)) {
371 phydev->speed = settings[i].speed;
372 phydev->duplex = settings[i].duplex;
373 break;
374 }
375
376 phy_resolve_aneg_pause(phydev);
377 }
378 EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode);
379
380 /**
381 * phy_check_downshift - check whether downshift occurred
382 * @phydev: The phy_device struct
383 *
384 * Check whether a downshift to a lower speed occurred. If this should be the
385 * case warn the user.
386 * Prerequisite for detecting downshift is that PHY driver implements the
387 * read_status callback and sets phydev->speed to the actual link speed.
388 */
phy_check_downshift(struct phy_device * phydev)389 void phy_check_downshift(struct phy_device *phydev)
390 {
391 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
392 int i, speed = SPEED_UNKNOWN;
393
394 phydev->downshifted_rate = 0;
395
396 if (phydev->autoneg == AUTONEG_DISABLE ||
397 phydev->speed == SPEED_UNKNOWN)
398 return;
399
400 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
401
402 for (i = 0; i < ARRAY_SIZE(settings); i++)
403 if (test_bit(settings[i].bit, common)) {
404 speed = settings[i].speed;
405 break;
406 }
407
408 if (speed == SPEED_UNKNOWN || phydev->speed >= speed)
409 return;
410
411 phydev_warn(phydev, "Downshift occurred from negotiated speed %s to actual speed %s, check cabling!\n",
412 phy_speed_to_str(speed), phy_speed_to_str(phydev->speed));
413
414 phydev->downshifted_rate = 1;
415 }
416 EXPORT_SYMBOL_GPL(phy_check_downshift);
417
phy_resolve_min_speed(struct phy_device * phydev,bool fdx_only)418 static int phy_resolve_min_speed(struct phy_device *phydev, bool fdx_only)
419 {
420 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
421 int i = ARRAY_SIZE(settings);
422
423 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
424
425 while (--i >= 0) {
426 if (test_bit(settings[i].bit, common)) {
427 if (fdx_only && settings[i].duplex != DUPLEX_FULL)
428 continue;
429 return settings[i].speed;
430 }
431 }
432
433 return SPEED_UNKNOWN;
434 }
435
phy_speed_down_core(struct phy_device * phydev)436 int phy_speed_down_core(struct phy_device *phydev)
437 {
438 int min_common_speed = phy_resolve_min_speed(phydev, true);
439
440 if (min_common_speed == SPEED_UNKNOWN)
441 return -EINVAL;
442
443 return __set_linkmode_max_speed(min_common_speed, phydev->advertising);
444 }
445
mmd_phy_indirect(struct mii_bus * bus,int phy_addr,int devad,u16 regnum)446 static void mmd_phy_indirect(struct mii_bus *bus, int phy_addr, int devad,
447 u16 regnum)
448 {
449 /* Write the desired MMD Devad */
450 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL, devad);
451
452 /* Write the desired MMD register address */
453 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, regnum);
454
455 /* Select the Function : DATA with no post increment */
456 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL,
457 devad | MII_MMD_CTRL_NOINCR);
458 }
459
460 /**
461 * __phy_read_mmd - Convenience function for reading a register
462 * from an MMD on a given PHY.
463 * @phydev: The phy_device struct
464 * @devad: The MMD to read from (0..31)
465 * @regnum: The register on the MMD to read (0..65535)
466 *
467 * Same rules as for __phy_read();
468 */
__phy_read_mmd(struct phy_device * phydev,int devad,u32 regnum)469 int __phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
470 {
471 int val;
472
473 if (regnum > (u16)~0 || devad > 32)
474 return -EINVAL;
475
476 if (phydev->drv && phydev->drv->read_mmd) {
477 val = phydev->drv->read_mmd(phydev, devad, regnum);
478 } else if (phydev->is_c45) {
479 val = __mdiobus_c45_read(phydev->mdio.bus, phydev->mdio.addr,
480 devad, regnum);
481 } else {
482 struct mii_bus *bus = phydev->mdio.bus;
483 int phy_addr = phydev->mdio.addr;
484
485 mmd_phy_indirect(bus, phy_addr, devad, regnum);
486
487 /* Read the content of the MMD's selected register */
488 val = __mdiobus_read(bus, phy_addr, MII_MMD_DATA);
489 }
490 return val;
491 }
492 EXPORT_SYMBOL(__phy_read_mmd);
493
494 /**
495 * phy_read_mmd - Convenience function for reading a register
496 * from an MMD on a given PHY.
497 * @phydev: The phy_device struct
498 * @devad: The MMD to read from
499 * @regnum: The register on the MMD to read
500 *
501 * Same rules as for phy_read();
502 */
phy_read_mmd(struct phy_device * phydev,int devad,u32 regnum)503 int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
504 {
505 int ret;
506
507 phy_lock_mdio_bus(phydev);
508 ret = __phy_read_mmd(phydev, devad, regnum);
509 phy_unlock_mdio_bus(phydev);
510
511 return ret;
512 }
513 EXPORT_SYMBOL(phy_read_mmd);
514
515 /**
516 * __phy_write_mmd - Convenience function for writing a register
517 * on an MMD on a given PHY.
518 * @phydev: The phy_device struct
519 * @devad: The MMD to read from
520 * @regnum: The register on the MMD to read
521 * @val: value to write to @regnum
522 *
523 * Same rules as for __phy_write();
524 */
__phy_write_mmd(struct phy_device * phydev,int devad,u32 regnum,u16 val)525 int __phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
526 {
527 int ret;
528
529 if (regnum > (u16)~0 || devad > 32)
530 return -EINVAL;
531
532 if (phydev->drv && phydev->drv->write_mmd) {
533 ret = phydev->drv->write_mmd(phydev, devad, regnum, val);
534 } else if (phydev->is_c45) {
535 ret = __mdiobus_c45_write(phydev->mdio.bus, phydev->mdio.addr,
536 devad, regnum, val);
537 } else {
538 struct mii_bus *bus = phydev->mdio.bus;
539 int phy_addr = phydev->mdio.addr;
540
541 mmd_phy_indirect(bus, phy_addr, devad, regnum);
542
543 /* Write the data into MMD's selected register */
544 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, val);
545
546 ret = 0;
547 }
548 return ret;
549 }
550 EXPORT_SYMBOL(__phy_write_mmd);
551
552 /**
553 * phy_write_mmd - Convenience function for writing a register
554 * on an MMD on a given PHY.
555 * @phydev: The phy_device struct
556 * @devad: The MMD to read from
557 * @regnum: The register on the MMD to read
558 * @val: value to write to @regnum
559 *
560 * Same rules as for phy_write();
561 */
phy_write_mmd(struct phy_device * phydev,int devad,u32 regnum,u16 val)562 int phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
563 {
564 int ret;
565
566 phy_lock_mdio_bus(phydev);
567 ret = __phy_write_mmd(phydev, devad, regnum, val);
568 phy_unlock_mdio_bus(phydev);
569
570 return ret;
571 }
572 EXPORT_SYMBOL(phy_write_mmd);
573
574 /**
575 * phy_modify_changed - Function for modifying a PHY register
576 * @phydev: the phy_device struct
577 * @regnum: register number to modify
578 * @mask: bit mask of bits to clear
579 * @set: new value of bits set in mask to write to @regnum
580 *
581 * NOTE: MUST NOT be called from interrupt context,
582 * because the bus read/write functions may wait for an interrupt
583 * to conclude the operation.
584 *
585 * Returns negative errno, 0 if there was no change, and 1 in case of change
586 */
phy_modify_changed(struct phy_device * phydev,u32 regnum,u16 mask,u16 set)587 int phy_modify_changed(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
588 {
589 int ret;
590
591 phy_lock_mdio_bus(phydev);
592 ret = __phy_modify_changed(phydev, regnum, mask, set);
593 phy_unlock_mdio_bus(phydev);
594
595 return ret;
596 }
597 EXPORT_SYMBOL_GPL(phy_modify_changed);
598
599 /**
600 * __phy_modify - Convenience function for modifying a PHY register
601 * @phydev: the phy_device struct
602 * @regnum: register number to modify
603 * @mask: bit mask of bits to clear
604 * @set: new value of bits set in mask to write to @regnum
605 *
606 * NOTE: MUST NOT be called from interrupt context,
607 * because the bus read/write functions may wait for an interrupt
608 * to conclude the operation.
609 */
__phy_modify(struct phy_device * phydev,u32 regnum,u16 mask,u16 set)610 int __phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
611 {
612 int ret;
613
614 ret = __phy_modify_changed(phydev, regnum, mask, set);
615
616 return ret < 0 ? ret : 0;
617 }
618 EXPORT_SYMBOL_GPL(__phy_modify);
619
620 /**
621 * phy_modify - Convenience function for modifying a given PHY register
622 * @phydev: the phy_device struct
623 * @regnum: register number to write
624 * @mask: bit mask of bits to clear
625 * @set: new value of bits set in mask to write to @regnum
626 *
627 * NOTE: MUST NOT be called from interrupt context,
628 * because the bus read/write functions may wait for an interrupt
629 * to conclude the operation.
630 */
phy_modify(struct phy_device * phydev,u32 regnum,u16 mask,u16 set)631 int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
632 {
633 int ret;
634
635 phy_lock_mdio_bus(phydev);
636 ret = __phy_modify(phydev, regnum, mask, set);
637 phy_unlock_mdio_bus(phydev);
638
639 return ret;
640 }
641 EXPORT_SYMBOL_GPL(phy_modify);
642
643 /**
644 * __phy_modify_mmd_changed - Function for modifying a register on MMD
645 * @phydev: the phy_device struct
646 * @devad: the MMD containing register to modify
647 * @regnum: register number to modify
648 * @mask: bit mask of bits to clear
649 * @set: new value of bits set in mask to write to @regnum
650 *
651 * Unlocked helper function which allows a MMD register to be modified as
652 * new register value = (old register value & ~mask) | set
653 *
654 * Returns negative errno, 0 if there was no change, and 1 in case of change
655 */
__phy_modify_mmd_changed(struct phy_device * phydev,int devad,u32 regnum,u16 mask,u16 set)656 int __phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum,
657 u16 mask, u16 set)
658 {
659 int new, ret;
660
661 ret = __phy_read_mmd(phydev, devad, regnum);
662 if (ret < 0)
663 return ret;
664
665 new = (ret & ~mask) | set;
666 if (new == ret)
667 return 0;
668
669 ret = __phy_write_mmd(phydev, devad, regnum, new);
670
671 return ret < 0 ? ret : 1;
672 }
673 EXPORT_SYMBOL_GPL(__phy_modify_mmd_changed);
674
675 /**
676 * phy_modify_mmd_changed - Function for modifying a register on MMD
677 * @phydev: the phy_device struct
678 * @devad: the MMD containing register to modify
679 * @regnum: register number to modify
680 * @mask: bit mask of bits to clear
681 * @set: new value of bits set in mask to write to @regnum
682 *
683 * NOTE: MUST NOT be called from interrupt context,
684 * because the bus read/write functions may wait for an interrupt
685 * to conclude the operation.
686 *
687 * Returns negative errno, 0 if there was no change, and 1 in case of change
688 */
phy_modify_mmd_changed(struct phy_device * phydev,int devad,u32 regnum,u16 mask,u16 set)689 int phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum,
690 u16 mask, u16 set)
691 {
692 int ret;
693
694 phy_lock_mdio_bus(phydev);
695 ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set);
696 phy_unlock_mdio_bus(phydev);
697
698 return ret;
699 }
700 EXPORT_SYMBOL_GPL(phy_modify_mmd_changed);
701
702 /**
703 * __phy_modify_mmd - Convenience function for modifying a register on MMD
704 * @phydev: the phy_device struct
705 * @devad: the MMD containing register to modify
706 * @regnum: register number to modify
707 * @mask: bit mask of bits to clear
708 * @set: new value of bits set in mask to write to @regnum
709 *
710 * NOTE: MUST NOT be called from interrupt context,
711 * because the bus read/write functions may wait for an interrupt
712 * to conclude the operation.
713 */
__phy_modify_mmd(struct phy_device * phydev,int devad,u32 regnum,u16 mask,u16 set)714 int __phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum,
715 u16 mask, u16 set)
716 {
717 int ret;
718
719 ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set);
720
721 return ret < 0 ? ret : 0;
722 }
723 EXPORT_SYMBOL_GPL(__phy_modify_mmd);
724
725 /**
726 * phy_modify_mmd - Convenience function for modifying a register on MMD
727 * @phydev: the phy_device struct
728 * @devad: the MMD containing register to modify
729 * @regnum: register number to modify
730 * @mask: bit mask of bits to clear
731 * @set: new value of bits set in mask to write to @regnum
732 *
733 * NOTE: MUST NOT be called from interrupt context,
734 * because the bus read/write functions may wait for an interrupt
735 * to conclude the operation.
736 */
phy_modify_mmd(struct phy_device * phydev,int devad,u32 regnum,u16 mask,u16 set)737 int phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum,
738 u16 mask, u16 set)
739 {
740 int ret;
741
742 phy_lock_mdio_bus(phydev);
743 ret = __phy_modify_mmd(phydev, devad, regnum, mask, set);
744 phy_unlock_mdio_bus(phydev);
745
746 return ret;
747 }
748 EXPORT_SYMBOL_GPL(phy_modify_mmd);
749
__phy_read_page(struct phy_device * phydev)750 static int __phy_read_page(struct phy_device *phydev)
751 {
752 if (WARN_ONCE(!phydev->drv->read_page, "read_page callback not available, PHY driver not loaded?\n"))
753 return -EOPNOTSUPP;
754
755 return phydev->drv->read_page(phydev);
756 }
757
__phy_write_page(struct phy_device * phydev,int page)758 static int __phy_write_page(struct phy_device *phydev, int page)
759 {
760 if (WARN_ONCE(!phydev->drv->write_page, "write_page callback not available, PHY driver not loaded?\n"))
761 return -EOPNOTSUPP;
762
763 return phydev->drv->write_page(phydev, page);
764 }
765
766 /**
767 * phy_save_page() - take the bus lock and save the current page
768 * @phydev: a pointer to a &struct phy_device
769 *
770 * Take the MDIO bus lock, and return the current page number. On error,
771 * returns a negative errno. phy_restore_page() must always be called
772 * after this, irrespective of success or failure of this call.
773 */
phy_save_page(struct phy_device * phydev)774 int phy_save_page(struct phy_device *phydev)
775 {
776 phy_lock_mdio_bus(phydev);
777 return __phy_read_page(phydev);
778 }
779 EXPORT_SYMBOL_GPL(phy_save_page);
780
781 /**
782 * phy_select_page() - take the bus lock, save the current page, and set a page
783 * @phydev: a pointer to a &struct phy_device
784 * @page: desired page
785 *
786 * Take the MDIO bus lock to protect against concurrent access, save the
787 * current PHY page, and set the current page. On error, returns a
788 * negative errno, otherwise returns the previous page number.
789 * phy_restore_page() must always be called after this, irrespective
790 * of success or failure of this call.
791 */
phy_select_page(struct phy_device * phydev,int page)792 int phy_select_page(struct phy_device *phydev, int page)
793 {
794 int ret, oldpage;
795
796 oldpage = ret = phy_save_page(phydev);
797 if (ret < 0)
798 return ret;
799
800 if (oldpage != page) {
801 ret = __phy_write_page(phydev, page);
802 if (ret < 0)
803 return ret;
804 }
805
806 return oldpage;
807 }
808 EXPORT_SYMBOL_GPL(phy_select_page);
809
810 /**
811 * phy_restore_page() - restore the page register and release the bus lock
812 * @phydev: a pointer to a &struct phy_device
813 * @oldpage: the old page, return value from phy_save_page() or phy_select_page()
814 * @ret: operation's return code
815 *
816 * Release the MDIO bus lock, restoring @oldpage if it is a valid page.
817 * This function propagates the earliest error code from the group of
818 * operations.
819 *
820 * Returns:
821 * @oldpage if it was a negative value, otherwise
822 * @ret if it was a negative errno value, otherwise
823 * phy_write_page()'s negative value if it were in error, otherwise
824 * @ret.
825 */
phy_restore_page(struct phy_device * phydev,int oldpage,int ret)826 int phy_restore_page(struct phy_device *phydev, int oldpage, int ret)
827 {
828 int r;
829
830 if (oldpage >= 0) {
831 r = __phy_write_page(phydev, oldpage);
832
833 /* Propagate the operation return code if the page write
834 * was successful.
835 */
836 if (ret >= 0 && r < 0)
837 ret = r;
838 } else {
839 /* Propagate the phy page selection error code */
840 ret = oldpage;
841 }
842
843 phy_unlock_mdio_bus(phydev);
844
845 return ret;
846 }
847 EXPORT_SYMBOL_GPL(phy_restore_page);
848
849 /**
850 * phy_read_paged() - Convenience function for reading a paged register
851 * @phydev: a pointer to a &struct phy_device
852 * @page: the page for the phy
853 * @regnum: register number
854 *
855 * Same rules as for phy_read().
856 */
phy_read_paged(struct phy_device * phydev,int page,u32 regnum)857 int phy_read_paged(struct phy_device *phydev, int page, u32 regnum)
858 {
859 int ret = 0, oldpage;
860
861 oldpage = phy_select_page(phydev, page);
862 if (oldpage >= 0)
863 ret = __phy_read(phydev, regnum);
864
865 return phy_restore_page(phydev, oldpage, ret);
866 }
867 EXPORT_SYMBOL(phy_read_paged);
868
869 /**
870 * phy_write_paged() - Convenience function for writing a paged register
871 * @phydev: a pointer to a &struct phy_device
872 * @page: the page for the phy
873 * @regnum: register number
874 * @val: value to write
875 *
876 * Same rules as for phy_write().
877 */
phy_write_paged(struct phy_device * phydev,int page,u32 regnum,u16 val)878 int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val)
879 {
880 int ret = 0, oldpage;
881
882 oldpage = phy_select_page(phydev, page);
883 if (oldpage >= 0)
884 ret = __phy_write(phydev, regnum, val);
885
886 return phy_restore_page(phydev, oldpage, ret);
887 }
888 EXPORT_SYMBOL(phy_write_paged);
889
890 /**
891 * phy_modify_paged_changed() - Function for modifying a paged register
892 * @phydev: a pointer to a &struct phy_device
893 * @page: the page for the phy
894 * @regnum: register number
895 * @mask: bit mask of bits to clear
896 * @set: bit mask of bits to set
897 *
898 * Returns negative errno, 0 if there was no change, and 1 in case of change
899 */
phy_modify_paged_changed(struct phy_device * phydev,int page,u32 regnum,u16 mask,u16 set)900 int phy_modify_paged_changed(struct phy_device *phydev, int page, u32 regnum,
901 u16 mask, u16 set)
902 {
903 int ret = 0, oldpage;
904
905 oldpage = phy_select_page(phydev, page);
906 if (oldpage >= 0)
907 ret = __phy_modify_changed(phydev, regnum, mask, set);
908
909 return phy_restore_page(phydev, oldpage, ret);
910 }
911 EXPORT_SYMBOL(phy_modify_paged_changed);
912
913 /**
914 * phy_modify_paged() - Convenience function for modifying a paged register
915 * @phydev: a pointer to a &struct phy_device
916 * @page: the page for the phy
917 * @regnum: register number
918 * @mask: bit mask of bits to clear
919 * @set: bit mask of bits to set
920 *
921 * Same rules as for phy_read() and phy_write().
922 */
phy_modify_paged(struct phy_device * phydev,int page,u32 regnum,u16 mask,u16 set)923 int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
924 u16 mask, u16 set)
925 {
926 int ret = phy_modify_paged_changed(phydev, page, regnum, mask, set);
927
928 return ret < 0 ? ret : 0;
929 }
930 EXPORT_SYMBOL(phy_modify_paged);
931
