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 != 102,
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_800000:
53 return "800Gbps";
54 case SPEED_UNKNOWN:
55 return "Unknown";
56 default:
57 return "Unsupported (update phy-core.c)";
58 }
59 }
60 EXPORT_SYMBOL_GPL(phy_speed_to_str);
61
62 /**
63 * phy_duplex_to_str - Return string describing the duplex
64 *
65 * @duplex: Duplex setting to describe
66 */
phy_duplex_to_str(unsigned int duplex)67 const char *phy_duplex_to_str(unsigned int duplex)
68 {
69 if (duplex == DUPLEX_HALF)
70 return "Half";
71 if (duplex == DUPLEX_FULL)
72 return "Full";
73 if (duplex == DUPLEX_UNKNOWN)
74 return "Unknown";
75 return "Unsupported (update phy-core.c)";
76 }
77 EXPORT_SYMBOL_GPL(phy_duplex_to_str);
78
79 /**
80 * phy_rate_matching_to_str - Return a string describing the rate matching
81 *
82 * @rate_matching: Type of rate matching to describe
83 */
phy_rate_matching_to_str(int rate_matching)84 const char *phy_rate_matching_to_str(int rate_matching)
85 {
86 switch (rate_matching) {
87 case RATE_MATCH_NONE:
88 return "none";
89 case RATE_MATCH_PAUSE:
90 return "pause";
91 case RATE_MATCH_CRS:
92 return "crs";
93 case RATE_MATCH_OPEN_LOOP:
94 return "open-loop";
95 }
96 return "Unsupported (update phy-core.c)";
97 }
98 EXPORT_SYMBOL_GPL(phy_rate_matching_to_str);
99
100 /**
101 * phy_interface_num_ports - Return the number of links that can be carried by
102 * a given MAC-PHY physical link. Returns 0 if this is
103 * unknown, the number of links else.
104 *
105 * @interface: The interface mode we want to get the number of ports
106 */
phy_interface_num_ports(phy_interface_t interface)107 int phy_interface_num_ports(phy_interface_t interface)
108 {
109 switch (interface) {
110 case PHY_INTERFACE_MODE_NA:
111 return 0;
112 case PHY_INTERFACE_MODE_INTERNAL:
113 case PHY_INTERFACE_MODE_MII:
114 case PHY_INTERFACE_MODE_GMII:
115 case PHY_INTERFACE_MODE_TBI:
116 case PHY_INTERFACE_MODE_REVMII:
117 case PHY_INTERFACE_MODE_RMII:
118 case PHY_INTERFACE_MODE_REVRMII:
119 case PHY_INTERFACE_MODE_RGMII:
120 case PHY_INTERFACE_MODE_RGMII_ID:
121 case PHY_INTERFACE_MODE_RGMII_RXID:
122 case PHY_INTERFACE_MODE_RGMII_TXID:
123 case PHY_INTERFACE_MODE_RTBI:
124 case PHY_INTERFACE_MODE_XGMII:
125 case PHY_INTERFACE_MODE_XLGMII:
126 case PHY_INTERFACE_MODE_MOCA:
127 case PHY_INTERFACE_MODE_TRGMII:
128 case PHY_INTERFACE_MODE_USXGMII:
129 case PHY_INTERFACE_MODE_SGMII:
130 case PHY_INTERFACE_MODE_SMII:
131 case PHY_INTERFACE_MODE_1000BASEX:
132 case PHY_INTERFACE_MODE_2500BASEX:
133 case PHY_INTERFACE_MODE_5GBASER:
134 case PHY_INTERFACE_MODE_10GBASER:
135 case PHY_INTERFACE_MODE_25GBASER:
136 case PHY_INTERFACE_MODE_10GKR:
137 case PHY_INTERFACE_MODE_100BASEX:
138 case PHY_INTERFACE_MODE_RXAUI:
139 case PHY_INTERFACE_MODE_XAUI:
140 case PHY_INTERFACE_MODE_1000BASEKX:
141 return 1;
142 case PHY_INTERFACE_MODE_QSGMII:
143 case PHY_INTERFACE_MODE_QUSGMII:
144 return 4;
145 case PHY_INTERFACE_MODE_PSGMII:
146 return 5;
147 case PHY_INTERFACE_MODE_MAX:
148 WARN_ONCE(1, "PHY_INTERFACE_MODE_MAX isn't a valid interface mode");
149 return 0;
150 }
151 return 0;
152 }
153 EXPORT_SYMBOL_GPL(phy_interface_num_ports);
154
155 /* A mapping of all SUPPORTED settings to speed/duplex. This table
156 * must be grouped by speed and sorted in descending match priority
157 * - iow, descending speed.
158 */
159
160 #define PHY_SETTING(s, d, b) { .speed = SPEED_ ## s, .duplex = DUPLEX_ ## d, \
161 .bit = ETHTOOL_LINK_MODE_ ## b ## _BIT}
162
163 static const struct phy_setting settings[] = {
164 /* 800G */
165 PHY_SETTING( 800000, FULL, 800000baseCR8_Full ),
166 PHY_SETTING( 800000, FULL, 800000baseKR8_Full ),
167 PHY_SETTING( 800000, FULL, 800000baseDR8_Full ),
168 PHY_SETTING( 800000, FULL, 800000baseDR8_2_Full ),
169 PHY_SETTING( 800000, FULL, 800000baseSR8_Full ),
170 PHY_SETTING( 800000, FULL, 800000baseVR8_Full ),
171 /* 400G */
172 PHY_SETTING( 400000, FULL, 400000baseCR8_Full ),
173 PHY_SETTING( 400000, FULL, 400000baseKR8_Full ),
174 PHY_SETTING( 400000, FULL, 400000baseLR8_ER8_FR8_Full ),
175 PHY_SETTING( 400000, FULL, 400000baseDR8_Full ),
176 PHY_SETTING( 400000, FULL, 400000baseSR8_Full ),
177 PHY_SETTING( 400000, FULL, 400000baseCR4_Full ),
178 PHY_SETTING( 400000, FULL, 400000baseKR4_Full ),
179 PHY_SETTING( 400000, FULL, 400000baseLR4_ER4_FR4_Full ),
180 PHY_SETTING( 400000, FULL, 400000baseDR4_Full ),
181 PHY_SETTING( 400000, FULL, 400000baseSR4_Full ),
182 /* 200G */
183 PHY_SETTING( 200000, FULL, 200000baseCR4_Full ),
184 PHY_SETTING( 200000, FULL, 200000baseKR4_Full ),
185 PHY_SETTING( 200000, FULL, 200000baseLR4_ER4_FR4_Full ),
186 PHY_SETTING( 200000, FULL, 200000baseDR4_Full ),
187 PHY_SETTING( 200000, FULL, 200000baseSR4_Full ),
188 PHY_SETTING( 200000, FULL, 200000baseCR2_Full ),
189 PHY_SETTING( 200000, FULL, 200000baseKR2_Full ),
190 PHY_SETTING( 200000, FULL, 200000baseLR2_ER2_FR2_Full ),
191 PHY_SETTING( 200000, FULL, 200000baseDR2_Full ),
192 PHY_SETTING( 200000, FULL, 200000baseSR2_Full ),
193 /* 100G */
194 PHY_SETTING( 100000, FULL, 100000baseCR4_Full ),
195 PHY_SETTING( 100000, FULL, 100000baseKR4_Full ),
196 PHY_SETTING( 100000, FULL, 100000baseLR4_ER4_Full ),
197 PHY_SETTING( 100000, FULL, 100000baseSR4_Full ),
198 PHY_SETTING( 100000, FULL, 100000baseCR2_Full ),
199 PHY_SETTING( 100000, FULL, 100000baseKR2_Full ),
200 PHY_SETTING( 100000, FULL, 100000baseLR2_ER2_FR2_Full ),
201 PHY_SETTING( 100000, FULL, 100000baseDR2_Full ),
202 PHY_SETTING( 100000, FULL, 100000baseSR2_Full ),
203 PHY_SETTING( 100000, FULL, 100000baseCR_Full ),
204 PHY_SETTING( 100000, FULL, 100000baseKR_Full ),
205 PHY_SETTING( 100000, FULL, 100000baseLR_ER_FR_Full ),
206 PHY_SETTING( 100000, FULL, 100000baseDR_Full ),
207 PHY_SETTING( 100000, FULL, 100000baseSR_Full ),
208 /* 56G */
209 PHY_SETTING( 56000, FULL, 56000baseCR4_Full ),
210 PHY_SETTING( 56000, FULL, 56000baseKR4_Full ),
211 PHY_SETTING( 56000, FULL, 56000baseLR4_Full ),
212 PHY_SETTING( 56000, FULL, 56000baseSR4_Full ),
213 /* 50G */
214 PHY_SETTING( 50000, FULL, 50000baseCR2_Full ),
215 PHY_SETTING( 50000, FULL, 50000baseKR2_Full ),
216 PHY_SETTING( 50000, FULL, 50000baseSR2_Full ),
217 PHY_SETTING( 50000, FULL, 50000baseCR_Full ),
218 PHY_SETTING( 50000, FULL, 50000baseKR_Full ),
219 PHY_SETTING( 50000, FULL, 50000baseLR_ER_FR_Full ),
220 PHY_SETTING( 50000, FULL, 50000baseDR_Full ),
221 PHY_SETTING( 50000, FULL, 50000baseSR_Full ),
222 /* 40G */
223 PHY_SETTING( 40000, FULL, 40000baseCR4_Full ),
224 PHY_SETTING( 40000, FULL, 40000baseKR4_Full ),
225 PHY_SETTING( 40000, FULL, 40000baseLR4_Full ),
226 PHY_SETTING( 40000, FULL, 40000baseSR4_Full ),
227 /* 25G */
228 PHY_SETTING( 25000, FULL, 25000baseCR_Full ),
229 PHY_SETTING( 25000, FULL, 25000baseKR_Full ),
230 PHY_SETTING( 25000, FULL, 25000baseSR_Full ),
231 /* 20G */
232 PHY_SETTING( 20000, FULL, 20000baseKR2_Full ),
233 PHY_SETTING( 20000, FULL, 20000baseMLD2_Full ),
234 /* 10G */
235 PHY_SETTING( 10000, FULL, 10000baseCR_Full ),
236 PHY_SETTING( 10000, FULL, 10000baseER_Full ),
237 PHY_SETTING( 10000, FULL, 10000baseKR_Full ),
238 PHY_SETTING( 10000, FULL, 10000baseKX4_Full ),
239 PHY_SETTING( 10000, FULL, 10000baseLR_Full ),
240 PHY_SETTING( 10000, FULL, 10000baseLRM_Full ),
241 PHY_SETTING( 10000, FULL, 10000baseR_FEC ),
242 PHY_SETTING( 10000, FULL, 10000baseSR_Full ),
243 PHY_SETTING( 10000, FULL, 10000baseT_Full ),
244 /* 5G */
245 PHY_SETTING( 5000, FULL, 5000baseT_Full ),
246 /* 2.5G */
247 PHY_SETTING( 2500, FULL, 2500baseT_Full ),
248 PHY_SETTING( 2500, FULL, 2500baseX_Full ),
249 /* 1G */
250 PHY_SETTING( 1000, FULL, 1000baseT_Full ),
251 PHY_SETTING( 1000, HALF, 1000baseT_Half ),
252 PHY_SETTING( 1000, FULL, 1000baseT1_Full ),
253 PHY_SETTING( 1000, FULL, 1000baseX_Full ),
254 PHY_SETTING( 1000, FULL, 1000baseKX_Full ),
255 /* 100M */
256 PHY_SETTING( 100, FULL, 100baseT_Full ),
257 PHY_SETTING( 100, FULL, 100baseT1_Full ),
258 PHY_SETTING( 100, HALF, 100baseT_Half ),
259 PHY_SETTING( 100, HALF, 100baseFX_Half ),
260 PHY_SETTING( 100, FULL, 100baseFX_Full ),
261 /* 10M */
262 PHY_SETTING( 10, FULL, 10baseT_Full ),
263 PHY_SETTING( 10, HALF, 10baseT_Half ),
264 PHY_SETTING( 10, FULL, 10baseT1L_Full ),
265 PHY_SETTING( 10, FULL, 10baseT1S_Full ),
266 PHY_SETTING( 10, HALF, 10baseT1S_Half ),
267 PHY_SETTING( 10, HALF, 10baseT1S_P2MP_Half ),
268 };
269 #undef PHY_SETTING
270
271 /**
272 * phy_lookup_setting - lookup a PHY setting
273 * @speed: speed to match
274 * @duplex: duplex to match
275 * @mask: allowed link modes
276 * @exact: an exact match is required
277 *
278 * Search the settings array for a setting that matches the speed and
279 * duplex, and which is supported.
280 *
281 * If @exact is unset, either an exact match or %NULL for no match will
282 * be returned.
283 *
284 * If @exact is set, an exact match, the fastest supported setting at
285 * or below the specified speed, the slowest supported setting, or if
286 * they all fail, %NULL will be returned.
287 */
288 const struct phy_setting *
phy_lookup_setting(int speed,int duplex,const unsigned long * mask,bool exact)289 phy_lookup_setting(int speed, int duplex, const unsigned long *mask, bool exact)
290 {
291 const struct phy_setting *p, *match = NULL, *last = NULL;
292 int i;
293
294 for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
295 if (p->bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
296 test_bit(p->bit, mask)) {
297 last = p;
298 if (p->speed == speed && p->duplex == duplex) {
299 /* Exact match for speed and duplex */
300 match = p;
301 break;
302 } else if (!exact) {
303 if (!match && p->speed <= speed)
304 /* Candidate */
305 match = p;
306
307 if (p->speed < speed)
308 break;
309 }
310 }
311 }
312
313 if (!match && !exact)
314 match = last;
315
316 return match;
317 }
318 EXPORT_SYMBOL_GPL(phy_lookup_setting);
319
phy_speeds(unsigned int * speeds,size_t size,unsigned long * mask)320 size_t phy_speeds(unsigned int *speeds, size_t size,
321 unsigned long *mask)
322 {
323 size_t count;
324 int i;
325
326 for (i = 0, count = 0; i < ARRAY_SIZE(settings) && count < size; i++)
327 if (settings[i].bit < __ETHTOOL_LINK_MODE_MASK_NBITS &&
328 test_bit(settings[i].bit, mask) &&
329 (count == 0 || speeds[count - 1] != settings[i].speed))
330 speeds[count++] = settings[i].speed;
331
332 return count;
333 }
334
__set_linkmode_max_speed(u32 max_speed,unsigned long * addr)335 static void __set_linkmode_max_speed(u32 max_speed, unsigned long *addr)
336 {
337 const struct phy_setting *p;
338 int i;
339
340 for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
341 if (p->speed > max_speed)
342 linkmode_clear_bit(p->bit, addr);
343 else
344 break;
345 }
346 }
347
__set_phy_supported(struct phy_device * phydev,u32 max_speed)348 static void __set_phy_supported(struct phy_device *phydev, u32 max_speed)
349 {
350 __set_linkmode_max_speed(max_speed, phydev->supported);
351 }
352
353 /**
354 * phy_set_max_speed - Set the maximum speed the PHY should support
355 *
356 * @phydev: The phy_device struct
357 * @max_speed: Maximum speed
358 *
359 * The PHY might be more capable than the MAC. For example a Fast Ethernet
360 * is connected to a 1G PHY. This function allows the MAC to indicate its
361 * maximum speed, and so limit what the PHY will advertise.
362 */
phy_set_max_speed(struct phy_device * phydev,u32 max_speed)363 void phy_set_max_speed(struct phy_device *phydev, u32 max_speed)
364 {
365 __set_phy_supported(phydev, max_speed);
366
367 phy_advertise_supported(phydev);
368 }
369 EXPORT_SYMBOL(phy_set_max_speed);
370
of_set_phy_supported(struct phy_device * phydev)371 void of_set_phy_supported(struct phy_device *phydev)
372 {
373 struct device_node *node = phydev->mdio.dev.of_node;
374 u32 max_speed;
375
376 if (!IS_ENABLED(CONFIG_OF_MDIO))
377 return;
378
379 if (!node)
380 return;
381
382 if (!of_property_read_u32(node, "max-speed", &max_speed))
383 __set_phy_supported(phydev, max_speed);
384 }
385
of_set_phy_eee_broken(struct phy_device * phydev)386 void of_set_phy_eee_broken(struct phy_device *phydev)
387 {
388 struct device_node *node = phydev->mdio.dev.of_node;
389 u32 broken = 0;
390
391 if (!IS_ENABLED(CONFIG_OF_MDIO))
392 return;
393
394 if (!node)
395 return;
396
397 if (of_property_read_bool(node, "eee-broken-100tx"))
398 broken |= MDIO_EEE_100TX;
399 if (of_property_read_bool(node, "eee-broken-1000t"))
400 broken |= MDIO_EEE_1000T;
401 if (of_property_read_bool(node, "eee-broken-10gt"))
402 broken |= MDIO_EEE_10GT;
403 if (of_property_read_bool(node, "eee-broken-1000kx"))
404 broken |= MDIO_EEE_1000KX;
405 if (of_property_read_bool(node, "eee-broken-10gkx4"))
406 broken |= MDIO_EEE_10GKX4;
407 if (of_property_read_bool(node, "eee-broken-10gkr"))
408 broken |= MDIO_EEE_10GKR;
409
410 phydev->eee_broken_modes = broken;
411 }
412
413 /**
414 * phy_resolve_aneg_pause - Determine pause autoneg results
415 *
416 * @phydev: The phy_device struct
417 *
418 * Once autoneg has completed the local pause settings can be
419 * resolved. Determine if pause and asymmetric pause should be used
420 * by the MAC.
421 */
422
phy_resolve_aneg_pause(struct phy_device * phydev)423 void phy_resolve_aneg_pause(struct phy_device *phydev)
424 {
425 if (phydev->duplex == DUPLEX_FULL) {
426 phydev->pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
427 phydev->lp_advertising);
428 phydev->asym_pause = linkmode_test_bit(
429 ETHTOOL_LINK_MODE_Asym_Pause_BIT,
430 phydev->lp_advertising);
431 }
432 }
433 EXPORT_SYMBOL_GPL(phy_resolve_aneg_pause);
434
435 /**
436 * phy_resolve_aneg_linkmode - resolve the advertisements into PHY settings
437 * @phydev: The phy_device struct
438 *
439 * Resolve our and the link partner advertisements into their corresponding
440 * speed and duplex. If full duplex was negotiated, extract the pause mode
441 * from the link partner mask.
442 */
phy_resolve_aneg_linkmode(struct phy_device * phydev)443 void phy_resolve_aneg_linkmode(struct phy_device *phydev)
444 {
445 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
446 int i;
447
448 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
449
450 for (i = 0; i < ARRAY_SIZE(settings); i++)
451 if (test_bit(settings[i].bit, common)) {
452 phydev->speed = settings[i].speed;
453 phydev->duplex = settings[i].duplex;
454 break;
455 }
456
457 phy_resolve_aneg_pause(phydev);
458 }
459 EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode);
460
461 /**
462 * phy_check_downshift - check whether downshift occurred
463 * @phydev: The phy_device struct
464 *
465 * Check whether a downshift to a lower speed occurred. If this should be the
466 * case warn the user.
467 * Prerequisite for detecting downshift is that PHY driver implements the
468 * read_status callback and sets phydev->speed to the actual link speed.
469 */
phy_check_downshift(struct phy_device * phydev)470 void phy_check_downshift(struct phy_device *phydev)
471 {
472 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
473 int i, speed = SPEED_UNKNOWN;
474
475 phydev->downshifted_rate = 0;
476
477 if (phydev->autoneg == AUTONEG_DISABLE ||
478 phydev->speed == SPEED_UNKNOWN)
479 return;
480
481 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
482
483 for (i = 0; i < ARRAY_SIZE(settings); i++)
484 if (test_bit(settings[i].bit, common)) {
485 speed = settings[i].speed;
486 break;
487 }
488
489 if (speed == SPEED_UNKNOWN || phydev->speed >= speed)
490 return;
491
492 phydev_warn(phydev, "Downshift occurred from negotiated speed %s to actual speed %s, check cabling!\n",
493 phy_speed_to_str(speed), phy_speed_to_str(phydev->speed));
494
495 phydev->downshifted_rate = 1;
496 }
497 EXPORT_SYMBOL_GPL(phy_check_downshift);
498
phy_resolve_min_speed(struct phy_device * phydev,bool fdx_only)499 static int phy_resolve_min_speed(struct phy_device *phydev, bool fdx_only)
500 {
501 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
502 int i = ARRAY_SIZE(settings);
503
504 linkmode_and(common, phydev->lp_advertising, phydev->advertising);
505
506 while (--i >= 0) {
507 if (test_bit(settings[i].bit, common)) {
508 if (fdx_only && settings[i].duplex != DUPLEX_FULL)
509 continue;
510 return settings[i].speed;
511 }
512 }
513
514 return SPEED_UNKNOWN;
515 }
516
phy_speed_down_core(struct phy_device * phydev)517 int phy_speed_down_core(struct phy_device *phydev)
518 {
519 int min_common_speed = phy_resolve_min_speed(phydev, true);
520
521 if (min_common_speed == SPEED_UNKNOWN)
522 return -EINVAL;
523
524 __set_linkmode_max_speed(min_common_speed, phydev->advertising);
525
526 return 0;
527 }
528
mmd_phy_indirect(struct mii_bus * bus,int phy_addr,int devad,u16 regnum)529 static void mmd_phy_indirect(struct mii_bus *bus, int phy_addr, int devad,
530 u16 regnum)
531 {
532 /* Write the desired MMD Devad */
533 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL, devad);
534
535 /* Write the desired MMD register address */
536 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, regnum);
537
538 /* Select the Function : DATA with no post increment */
539 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL,
540 devad | MII_MMD_CTRL_NOINCR);
541 }
542
543 /**
544 * __phy_read_mmd - Convenience function for reading a register
545 * from an MMD on a given PHY.
546 * @phydev: The phy_device struct
547 * @devad: The MMD to read from (0..31)
548 * @regnum: The register on the MMD to read (0..65535)
549 *
550 * Same rules as for __phy_read();
551 */
__phy_read_mmd(struct phy_device * phydev,int devad,u32 regnum)552 int __phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
553 {
554 int val;
555
556 if (regnum > (u16)~0 || devad > 32)
557 return -EINVAL;
558
559 if (phydev->drv && phydev->drv->read_mmd) {
560 val = phydev->drv->read_mmd(phydev, devad, regnum);
561 } else if (phydev->is_c45) {
562 val = __mdiobus_c45_read(phydev->mdio.bus, phydev->mdio.addr,
563 devad, regnum);
564 } else {
565 struct mii_bus *bus = phydev->mdio.bus;
566 int phy_addr = phydev->mdio.addr;
567
568 mmd_phy_indirect(bus, phy_addr, devad, regnum);
569
570 /* Read the content of the MMD's selected register */
571 val = __mdiobus_read(bus, phy_addr, MII_MMD_DATA);
572 }
573 return val;
574 }
575 EXPORT_SYMBOL(__phy_read_mmd);
576
577 /**
578 * phy_read_mmd - Convenience function for reading a register
579 * from an MMD on a given PHY.
580 * @phydev: The phy_device struct
581 * @devad: The MMD to read from
582 * @regnum: The register on the MMD to read
583 *
584 * Same rules as for phy_read();
585 */
phy_read_mmd(struct phy_device * phydev,int devad,u32 regnum)586 int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
587 {
588 int ret;
589
590 phy_lock_mdio_bus(phydev);
591 ret = __phy_read_mmd(phydev, devad, regnum);
592 phy_unlock_mdio_bus(phydev);
593
594 return ret;
595 }
596 EXPORT_SYMBOL(phy_read_mmd);
597
598 /**
599 * __phy_write_mmd - Convenience function for writing a register
600 * on an MMD on a given PHY.
601 * @phydev: The phy_device struct
602 * @devad: The MMD to read from
603 * @regnum: The register on the MMD to read
604 * @val: value to write to @regnum
605 *
606 * Same rules as for __phy_write();
607 */
__phy_write_mmd(struct phy_device * phydev,int devad,u32 regnum,u16 val)608 int __phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
609 {
610 int ret;
611
612 if (regnum > (u16)~0 || devad > 32)
613 return -EINVAL;
614
615 if (phydev->drv && phydev->drv->write_mmd) {
616 ret = phydev->drv->write_mmd(phydev, devad, regnum, val);
617 } else if (phydev->is_c45) {
618 ret = __mdiobus_c45_write(phydev->mdio.bus, phydev->mdio.addr,
619 devad, regnum, val);
620 } else {
621 struct mii_bus *bus = phydev->mdio.bus;
622 int phy_addr = phydev->mdio.addr;
623
624 mmd_phy_indirect(bus, phy_addr, devad, regnum);
625
626 /* Write the data into MMD's selected register */
627 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, val);
628
629 ret = 0;
630 }
631 return ret;
632 }
633 EXPORT_SYMBOL(__phy_write_mmd);
634
635 /**
636 * phy_write_mmd - Convenience function for writing a register
637 * on an MMD on a given PHY.
638 * @phydev: The phy_device struct
639 * @devad: The MMD to read from
640 * @regnum: The register on the MMD to read
641 * @val: value to write to @regnum
642 *
643 * Same rules as for phy_write();
644 */
phy_write_mmd(struct phy_device * phydev,int devad,u32 regnum,u16 val)645 int phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
646 {
647 int ret;
648
649 phy_lock_mdio_bus(phydev);
650 ret = __phy_write_mmd(phydev, devad, regnum, val);
651 phy_unlock_mdio_bus(phydev);
652
653 return ret;
654 }
655 EXPORT_SYMBOL(phy_write_mmd);
656
657 /**
658 * phy_modify_changed - Function for modifying a PHY register
659 * @phydev: the phy_device struct
660 * @regnum: register number to modify
661 * @mask: bit mask of bits to clear
662 * @set: new value of bits set in mask to write to @regnum
663 *
664 * NOTE: MUST NOT be called from interrupt context,
665 * because the bus read/write functions may wait for an interrupt
666 * to conclude the operation.
667 *
668 * Returns negative errno, 0 if there was no change, and 1 in case of change
669 */
phy_modify_changed(struct phy_device * phydev,u32 regnum,u16 mask,u16 set)670 int phy_modify_changed(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
671 {
672 int ret;
673
674 phy_lock_mdio_bus(phydev);
675 ret = __phy_modify_changed(phydev, regnum, mask, set);
676 phy_unlock_mdio_bus(phydev);
677
678 return ret;
679 }
680 EXPORT_SYMBOL_GPL(phy_modify_changed);
681
682 /**
683 * __phy_modify - Convenience function for modifying a PHY register
684 * @phydev: the phy_device struct
685 * @regnum: register number to modify
686 * @mask: bit mask of bits to clear
687 * @set: new value of bits set in mask to write to @regnum
688 *
689 * NOTE: MUST NOT be called from interrupt context,
690 * because the bus read/write functions may wait for an interrupt
691 * to conclude the operation.
692 */
__phy_modify(struct phy_device * phydev,u32 regnum,u16 mask,u16 set)693 int __phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
694 {
695 int ret;
696
697 ret = __phy_modify_changed(phydev, regnum, mask, set);
698
699 return ret < 0 ? ret : 0;
700 }
701 EXPORT_SYMBOL_GPL(__phy_modify);
702
703 /**
704 * phy_modify - Convenience function for modifying a given PHY register
705 * @phydev: the phy_device struct
706 * @regnum: register number to write
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(struct phy_device * phydev,u32 regnum,u16 mask,u16 set)714 int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
715 {
716 int ret;
717
718 phy_lock_mdio_bus(phydev);
719 ret = __phy_modify(phydev, regnum, mask, set);
720 phy_unlock_mdio_bus(phydev);
721
722 return ret;
723 }
724 EXPORT_SYMBOL_GPL(phy_modify);
725
726 /**
727 * __phy_modify_mmd_changed - Function for modifying a register on MMD
728 * @phydev: the phy_device struct
729 * @devad: the MMD containing register to modify
730 * @regnum: register number to modify
731 * @mask: bit mask of bits to clear
732 * @set: new value of bits set in mask to write to @regnum
733 *
734 * Unlocked helper function which allows a MMD register to be modified as
735 * new register value = (old register value & ~mask) | set
736 *
737 * Returns negative errno, 0 if there was no change, and 1 in case of change
738 */
__phy_modify_mmd_changed(struct phy_device * phydev,int devad,u32 regnum,u16 mask,u16 set)739 int __phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum,
740 u16 mask, u16 set)
741 {
742 int new, ret;
743
744 ret = __phy_read_mmd(phydev, devad, regnum);
745 if (ret < 0)
746 return ret;
747
748 new = (ret & ~mask) | set;
749 if (new == ret)
750 return 0;
751
752 ret = __phy_write_mmd(phydev, devad, regnum, new);
753
754 return ret < 0 ? ret : 1;
755 }
756 EXPORT_SYMBOL_GPL(__phy_modify_mmd_changed);
757
758 /**
759 * phy_modify_mmd_changed - Function for modifying a register on MMD
760 * @phydev: the phy_device struct
761 * @devad: the MMD containing register to modify
762 * @regnum: register number to modify
763 * @mask: bit mask of bits to clear
764 * @set: new value of bits set in mask to write to @regnum
765 *
766 * NOTE: MUST NOT be called from interrupt context,
767 * because the bus read/write functions may wait for an interrupt
768 * to conclude the operation.
769 *
770 * Returns negative errno, 0 if there was no change, and 1 in case of change
771 */
phy_modify_mmd_changed(struct phy_device * phydev,int devad,u32 regnum,u16 mask,u16 set)772 int phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum,
773 u16 mask, u16 set)
774 {
775 int ret;
776
777 phy_lock_mdio_bus(phydev);
778 ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set);
779 phy_unlock_mdio_bus(phydev);
780
781 return ret;
782 }
783 EXPORT_SYMBOL_GPL(phy_modify_mmd_changed);
784
785 /**
786 * __phy_modify_mmd - Convenience function for modifying a register on MMD
787 * @phydev: the phy_device struct
788 * @devad: the MMD containing register to modify
789 * @regnum: register number to modify
790 * @mask: bit mask of bits to clear
791 * @set: new value of bits set in mask to write to @regnum
792 *
793 * NOTE: MUST NOT be called from interrupt context,
794 * because the bus read/write functions may wait for an interrupt
795 * to conclude the operation.
796 */
__phy_modify_mmd(struct phy_device * phydev,int devad,u32 regnum,u16 mask,u16 set)797 int __phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum,
798 u16 mask, u16 set)
799 {
800 int ret;
801
802 ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set);
803
804 return ret < 0 ? ret : 0;
805 }
806 EXPORT_SYMBOL_GPL(__phy_modify_mmd);
807
808 /**
809 * phy_modify_mmd - Convenience function for modifying a register on MMD
810 * @phydev: the phy_device struct
811 * @devad: the MMD containing register to modify
812 * @regnum: register number to modify
813 * @mask: bit mask of bits to clear
814 * @set: new value of bits set in mask to write to @regnum
815 *
816 * NOTE: MUST NOT be called from interrupt context,
817 * because the bus read/write functions may wait for an interrupt
818 * to conclude the operation.
819 */
phy_modify_mmd(struct phy_device * phydev,int devad,u32 regnum,u16 mask,u16 set)820 int phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum,
821 u16 mask, u16 set)
822 {
823 int ret;
824
825 phy_lock_mdio_bus(phydev);
826 ret = __phy_modify_mmd(phydev, devad, regnum, mask, set);
827 phy_unlock_mdio_bus(phydev);
828
829 return ret;
830 }
831 EXPORT_SYMBOL_GPL(phy_modify_mmd);
832
__phy_read_page(struct phy_device * phydev)833 static int __phy_read_page(struct phy_device *phydev)
834 {
835 if (WARN_ONCE(!phydev->drv->read_page, "read_page callback not available, PHY driver not loaded?\n"))
836 return -EOPNOTSUPP;
837
838 return phydev->drv->read_page(phydev);
839 }
840
__phy_write_page(struct phy_device * phydev,int page)841 static int __phy_write_page(struct phy_device *phydev, int page)
842 {
843 if (WARN_ONCE(!phydev->drv->write_page, "write_page callback not available, PHY driver not loaded?\n"))
844 return -EOPNOTSUPP;
845
846 return phydev->drv->write_page(phydev, page);
847 }
848
849 /**
850 * phy_save_page() - take the bus lock and save the current page
851 * @phydev: a pointer to a &struct phy_device
852 *
853 * Take the MDIO bus lock, and return the current page number. On error,
854 * returns a negative errno. phy_restore_page() must always be called
855 * after this, irrespective of success or failure of this call.
856 */
phy_save_page(struct phy_device * phydev)857 int phy_save_page(struct phy_device *phydev)
858 {
859 phy_lock_mdio_bus(phydev);
860 return __phy_read_page(phydev);
861 }
862 EXPORT_SYMBOL_GPL(phy_save_page);
863
864 /**
865 * phy_select_page() - take the bus lock, save the current page, and set a page
866 * @phydev: a pointer to a &struct phy_device
867 * @page: desired page
868 *
869 * Take the MDIO bus lock to protect against concurrent access, save the
870 * current PHY page, and set the current page. On error, returns a
871 * negative errno, otherwise returns the previous page number.
872 * phy_restore_page() must always be called after this, irrespective
873 * of success or failure of this call.
874 */
phy_select_page(struct phy_device * phydev,int page)875 int phy_select_page(struct phy_device *phydev, int page)
876 {
877 int ret, oldpage;
878
879 oldpage = ret = phy_save_page(phydev);
880 if (ret < 0)
881 return ret;
882
883 if (oldpage != page) {
884 ret = __phy_write_page(phydev, page);
885 if (ret < 0)
886 return ret;
887 }
888
889 return oldpage;
890 }
891 EXPORT_SYMBOL_GPL(phy_select_page);
892
893 /**
894 * phy_restore_page() - restore the page register and release the bus lock
895 * @phydev: a pointer to a &struct phy_device
896 * @oldpage: the old page, return value from phy_save_page() or phy_select_page()
897 * @ret: operation's return code
898 *
899 * Release the MDIO bus lock, restoring @oldpage if it is a valid page.
900 * This function propagates the earliest error code from the group of
901 * operations.
902 *
903 * Returns:
904 * @oldpage if it was a negative value, otherwise
905 * @ret if it was a negative errno value, otherwise
906 * phy_write_page()'s negative value if it were in error, otherwise
907 * @ret.
908 */
phy_restore_page(struct phy_device * phydev,int oldpage,int ret)909 int phy_restore_page(struct phy_device *phydev, int oldpage, int ret)
910 {
911 int r;
912
913 if (oldpage >= 0) {
914 r = __phy_write_page(phydev, oldpage);
915
916 /* Propagate the operation return code if the page write
917 * was successful.
918 */
919 if (ret >= 0 && r < 0)
920 ret = r;
921 } else {
922 /* Propagate the phy page selection error code */
923 ret = oldpage;
924 }
925
926 phy_unlock_mdio_bus(phydev);
927
928 return ret;
929 }
930 EXPORT_SYMBOL_GPL(phy_restore_page);
931
932 /**
933 * phy_read_paged() - Convenience function for reading a paged register
934 * @phydev: a pointer to a &struct phy_device
935 * @page: the page for the phy
936 * @regnum: register number
937 *
938 * Same rules as for phy_read().
939 */
phy_read_paged(struct phy_device * phydev,int page,u32 regnum)940 int phy_read_paged(struct phy_device *phydev, int page, u32 regnum)
941 {
942 int ret = 0, oldpage;
943
944 oldpage = phy_select_page(phydev, page);
945 if (oldpage >= 0)
946 ret = __phy_read(phydev, regnum);
947
948 return phy_restore_page(phydev, oldpage, ret);
949 }
950 EXPORT_SYMBOL(phy_read_paged);
951
952 /**
953 * phy_write_paged() - Convenience function for writing a paged register
954 * @phydev: a pointer to a &struct phy_device
955 * @page: the page for the phy
956 * @regnum: register number
957 * @val: value to write
958 *
959 * Same rules as for phy_write().
960 */
phy_write_paged(struct phy_device * phydev,int page,u32 regnum,u16 val)961 int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val)
962 {
963 int ret = 0, oldpage;
964
965 oldpage = phy_select_page(phydev, page);
966 if (oldpage >= 0)
967 ret = __phy_write(phydev, regnum, val);
968
969 return phy_restore_page(phydev, oldpage, ret);
970 }
971 EXPORT_SYMBOL(phy_write_paged);
972
973 /**
974 * phy_modify_paged_changed() - Function for modifying a paged register
975 * @phydev: a pointer to a &struct phy_device
976 * @page: the page for the phy
977 * @regnum: register number
978 * @mask: bit mask of bits to clear
979 * @set: bit mask of bits to set
980 *
981 * Returns negative errno, 0 if there was no change, and 1 in case of change
982 */
phy_modify_paged_changed(struct phy_device * phydev,int page,u32 regnum,u16 mask,u16 set)983 int phy_modify_paged_changed(struct phy_device *phydev, int page, u32 regnum,
984 u16 mask, u16 set)
985 {
986 int ret = 0, oldpage;
987
988 oldpage = phy_select_page(phydev, page);
989 if (oldpage >= 0)
990 ret = __phy_modify_changed(phydev, regnum, mask, set);
991
992 return phy_restore_page(phydev, oldpage, ret);
993 }
994 EXPORT_SYMBOL(phy_modify_paged_changed);
995
996 /**
997 * phy_modify_paged() - Convenience function for modifying a paged register
998 * @phydev: a pointer to a &struct phy_device
999 * @page: the page for the phy
1000 * @regnum: register number
1001 * @mask: bit mask of bits to clear
1002 * @set: bit mask of bits to set
1003 *
1004 * Same rules as for phy_read() and phy_write().
1005 */
phy_modify_paged(struct phy_device * phydev,int page,u32 regnum,u16 mask,u16 set)1006 int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
1007 u16 mask, u16 set)
1008 {
1009 int ret = phy_modify_paged_changed(phydev, page, regnum, mask, set);
1010
1011 return ret < 0 ? ret : 0;
1012 }
1013 EXPORT_SYMBOL(phy_modify_paged);
1014