1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * mdio.c: Generic support for MDIO-compatible transceivers
4 * Copyright 2006-2009 Solarflare Communications Inc.
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/capability.h>
9 #include <linux/errno.h>
10 #include <linux/ethtool.h>
11 #include <linux/mdio.h>
12 #include <linux/module.h>
13
14 MODULE_DESCRIPTION("Generic support for MDIO-compatible transceivers");
15 MODULE_AUTHOR("Copyright 2006-2009 Solarflare Communications Inc.");
16 MODULE_LICENSE("GPL");
17
18 /**
19 * mdio45_probe - probe for an MDIO (clause 45) device
20 * @mdio: MDIO interface
21 * @prtad: Expected PHY address
22 *
23 * This sets @prtad and @mmds in the MDIO interface if successful.
24 * Returns 0 on success, negative on error.
25 */
mdio45_probe(struct mdio_if_info * mdio,int prtad)26 int mdio45_probe(struct mdio_if_info *mdio, int prtad)
27 {
28 int mmd, stat2, devs1, devs2;
29
30 /* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
31 * XS or DTE XS; give up if none is present. */
32 for (mmd = 1; mmd <= 5; mmd++) {
33 /* Is this MMD present? */
34 stat2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_STAT2);
35 if (stat2 < 0 ||
36 (stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
37 continue;
38
39 /* It should tell us about all the other MMDs */
40 devs1 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS1);
41 devs2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS2);
42 if (devs1 < 0 || devs2 < 0)
43 continue;
44
45 mdio->prtad = prtad;
46 mdio->mmds = devs1 | (devs2 << 16);
47 return 0;
48 }
49
50 return -ENODEV;
51 }
52 EXPORT_SYMBOL(mdio45_probe);
53
54 /**
55 * mdio_set_flag - set or clear flag in an MDIO register
56 * @mdio: MDIO interface
57 * @prtad: PHY address
58 * @devad: MMD address
59 * @addr: Register address
60 * @mask: Mask for flag (single bit set)
61 * @sense: New value of flag
62 *
63 * This debounces changes: it does not write the register if the flag
64 * already has the proper value. Returns 0 on success, negative on error.
65 */
mdio_set_flag(const struct mdio_if_info * mdio,int prtad,int devad,u16 addr,int mask,bool sense)66 int mdio_set_flag(const struct mdio_if_info *mdio,
67 int prtad, int devad, u16 addr, int mask,
68 bool sense)
69 {
70 int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
71 int new_val;
72
73 if (old_val < 0)
74 return old_val;
75 if (sense)
76 new_val = old_val | mask;
77 else
78 new_val = old_val & ~mask;
79 if (old_val == new_val)
80 return 0;
81 return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
82 }
83 EXPORT_SYMBOL(mdio_set_flag);
84
85 /**
86 * mdio_link_ok - is link status up/OK
87 * @mdio: MDIO interface
88 * @mmd_mask: Mask for MMDs to check
89 *
90 * Returns 1 if the PHY reports link status up/OK, 0 otherwise.
91 * @mmd_mask is normally @mdio->mmds, but if loopback is enabled
92 * the MMDs being bypassed should be excluded from the mask.
93 */
mdio45_links_ok(const struct mdio_if_info * mdio,u32 mmd_mask)94 int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmd_mask)
95 {
96 int devad, reg;
97
98 if (!mmd_mask) {
99 /* Use absence of XGMII faults in lieu of link state */
100 reg = mdio->mdio_read(mdio->dev, mdio->prtad,
101 MDIO_MMD_PHYXS, MDIO_STAT2);
102 return reg >= 0 && !(reg & MDIO_STAT2_RXFAULT);
103 }
104
105 for (devad = 0; mmd_mask; devad++) {
106 if (mmd_mask & (1 << devad)) {
107 mmd_mask &= ~(1 << devad);
108
109 /* Reset the latched status and fault flags */
110 mdio->mdio_read(mdio->dev, mdio->prtad,
111 devad, MDIO_STAT1);
112 if (devad == MDIO_MMD_PMAPMD || devad == MDIO_MMD_PCS ||
113 devad == MDIO_MMD_PHYXS || devad == MDIO_MMD_DTEXS)
114 mdio->mdio_read(mdio->dev, mdio->prtad,
115 devad, MDIO_STAT2);
116
117 /* Check the current status and fault flags */
118 reg = mdio->mdio_read(mdio->dev, mdio->prtad,
119 devad, MDIO_STAT1);
120 if (reg < 0 ||
121 (reg & (MDIO_STAT1_FAULT | MDIO_STAT1_LSTATUS)) !=
122 MDIO_STAT1_LSTATUS)
123 return false;
124 }
125 }
126
127 return true;
128 }
129 EXPORT_SYMBOL(mdio45_links_ok);
130
131 /**
132 * mdio45_nway_restart - restart auto-negotiation for this interface
133 * @mdio: MDIO interface
134 *
135 * Returns 0 on success, negative on error.
136 */
mdio45_nway_restart(const struct mdio_if_info * mdio)137 int mdio45_nway_restart(const struct mdio_if_info *mdio)
138 {
139 if (!(mdio->mmds & MDIO_DEVS_AN))
140 return -EOPNOTSUPP;
141
142 mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
143 MDIO_AN_CTRL1_RESTART, true);
144 return 0;
145 }
146 EXPORT_SYMBOL(mdio45_nway_restart);
147
mdio45_get_an(const struct mdio_if_info * mdio,u16 addr)148 static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
149 {
150 u32 result = 0;
151 int reg;
152
153 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
154 if (reg & ADVERTISE_10HALF)
155 result |= ADVERTISED_10baseT_Half;
156 if (reg & ADVERTISE_10FULL)
157 result |= ADVERTISED_10baseT_Full;
158 if (reg & ADVERTISE_100HALF)
159 result |= ADVERTISED_100baseT_Half;
160 if (reg & ADVERTISE_100FULL)
161 result |= ADVERTISED_100baseT_Full;
162 if (reg & ADVERTISE_PAUSE_CAP)
163 result |= ADVERTISED_Pause;
164 if (reg & ADVERTISE_PAUSE_ASYM)
165 result |= ADVERTISED_Asym_Pause;
166 return result;
167 }
168
169 /**
170 * mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
171 * @mdio: MDIO interface
172 * @ecmd: Ethtool request structure
173 * @npage_adv: Modes currently advertised on next pages
174 * @npage_lpa: Modes advertised by link partner on next pages
175 *
176 * The @ecmd parameter is expected to have been cleared before calling
177 * mdio45_ethtool_gset_npage().
178 *
179 * Since the CSRs for auto-negotiation using next pages are not fully
180 * standardised, this function does not attempt to decode them. The
181 * caller must pass them in.
182 */
mdio45_ethtool_gset_npage(const struct mdio_if_info * mdio,struct ethtool_cmd * ecmd,u32 npage_adv,u32 npage_lpa)183 void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
184 struct ethtool_cmd *ecmd,
185 u32 npage_adv, u32 npage_lpa)
186 {
187 int reg;
188 u32 speed;
189
190 BUILD_BUG_ON(MDIO_SUPPORTS_C22 != ETH_MDIO_SUPPORTS_C22);
191 BUILD_BUG_ON(MDIO_SUPPORTS_C45 != ETH_MDIO_SUPPORTS_C45);
192
193 ecmd->transceiver = XCVR_INTERNAL;
194 ecmd->phy_address = mdio->prtad;
195 ecmd->mdio_support =
196 mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
197
198 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
199 MDIO_CTRL2);
200 switch (reg & MDIO_PMA_CTRL2_TYPE) {
201 case MDIO_PMA_CTRL2_10GBT:
202 case MDIO_PMA_CTRL2_1000BT:
203 case MDIO_PMA_CTRL2_100BTX:
204 case MDIO_PMA_CTRL2_10BT:
205 ecmd->port = PORT_TP;
206 ecmd->supported = SUPPORTED_TP;
207 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
208 MDIO_SPEED);
209 if (reg & MDIO_SPEED_10G)
210 ecmd->supported |= SUPPORTED_10000baseT_Full;
211 if (reg & MDIO_PMA_SPEED_1000)
212 ecmd->supported |= (SUPPORTED_1000baseT_Full |
213 SUPPORTED_1000baseT_Half);
214 if (reg & MDIO_PMA_SPEED_100)
215 ecmd->supported |= (SUPPORTED_100baseT_Full |
216 SUPPORTED_100baseT_Half);
217 if (reg & MDIO_PMA_SPEED_10)
218 ecmd->supported |= (SUPPORTED_10baseT_Full |
219 SUPPORTED_10baseT_Half);
220 ecmd->advertising = ADVERTISED_TP;
221 break;
222
223 case MDIO_PMA_CTRL2_10GBCX4:
224 ecmd->port = PORT_OTHER;
225 ecmd->supported = 0;
226 ecmd->advertising = 0;
227 break;
228
229 case MDIO_PMA_CTRL2_10GBKX4:
230 case MDIO_PMA_CTRL2_10GBKR:
231 case MDIO_PMA_CTRL2_1000BKX:
232 ecmd->port = PORT_OTHER;
233 ecmd->supported = SUPPORTED_Backplane;
234 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
235 MDIO_PMA_EXTABLE);
236 if (reg & MDIO_PMA_EXTABLE_10GBKX4)
237 ecmd->supported |= SUPPORTED_10000baseKX4_Full;
238 if (reg & MDIO_PMA_EXTABLE_10GBKR)
239 ecmd->supported |= SUPPORTED_10000baseKR_Full;
240 if (reg & MDIO_PMA_EXTABLE_1000BKX)
241 ecmd->supported |= SUPPORTED_1000baseKX_Full;
242 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
243 MDIO_PMA_10GBR_FECABLE);
244 if (reg & MDIO_PMA_10GBR_FECABLE_ABLE)
245 ecmd->supported |= SUPPORTED_10000baseR_FEC;
246 ecmd->advertising = ADVERTISED_Backplane;
247 break;
248
249 /* All the other defined modes are flavours of optical */
250 default:
251 ecmd->port = PORT_FIBRE;
252 ecmd->supported = SUPPORTED_FIBRE;
253 ecmd->advertising = ADVERTISED_FIBRE;
254 break;
255 }
256
257 if (mdio->mmds & MDIO_DEVS_AN) {
258 ecmd->supported |= SUPPORTED_Autoneg;
259 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
260 MDIO_CTRL1);
261 if (reg & MDIO_AN_CTRL1_ENABLE) {
262 ecmd->autoneg = AUTONEG_ENABLE;
263 ecmd->advertising |=
264 ADVERTISED_Autoneg |
265 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
266 npage_adv;
267 } else {
268 ecmd->autoneg = AUTONEG_DISABLE;
269 }
270 } else {
271 ecmd->autoneg = AUTONEG_DISABLE;
272 }
273
274 if (ecmd->autoneg) {
275 u32 modes = 0;
276 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
277 MDIO_MMD_AN, MDIO_STAT1);
278
279 /* If AN is complete and successful, report best common
280 * mode, otherwise report best advertised mode. */
281 if (an_stat & MDIO_AN_STAT1_COMPLETE) {
282 ecmd->lp_advertising =
283 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
284 if (an_stat & MDIO_AN_STAT1_LPABLE)
285 ecmd->lp_advertising |= ADVERTISED_Autoneg;
286 modes = ecmd->advertising & ecmd->lp_advertising;
287 }
288 if ((modes & ~ADVERTISED_Autoneg) == 0)
289 modes = ecmd->advertising;
290
291 if (modes & (ADVERTISED_10000baseT_Full |
292 ADVERTISED_10000baseKX4_Full |
293 ADVERTISED_10000baseKR_Full)) {
294 speed = SPEED_10000;
295 ecmd->duplex = DUPLEX_FULL;
296 } else if (modes & (ADVERTISED_1000baseT_Full |
297 ADVERTISED_1000baseT_Half |
298 ADVERTISED_1000baseKX_Full)) {
299 speed = SPEED_1000;
300 ecmd->duplex = !(modes & ADVERTISED_1000baseT_Half);
301 } else if (modes & (ADVERTISED_100baseT_Full |
302 ADVERTISED_100baseT_Half)) {
303 speed = SPEED_100;
304 ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full);
305 } else {
306 speed = SPEED_10;
307 ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
308 }
309 } else {
310 /* Report forced settings */
311 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
312 MDIO_CTRL1);
313 speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1)
314 * ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
315 ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX ||
316 speed == SPEED_10000);
317 }
318
319 ethtool_cmd_speed_set(ecmd, speed);
320
321 /* 10GBASE-T MDI/MDI-X */
322 if (ecmd->port == PORT_TP
323 && (ethtool_cmd_speed(ecmd) == SPEED_10000)) {
324 switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
325 MDIO_PMA_10GBT_SWAPPOL)) {
326 case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
327 ecmd->eth_tp_mdix = ETH_TP_MDI;
328 break;
329 case 0:
330 ecmd->eth_tp_mdix = ETH_TP_MDI_X;
331 break;
332 default:
333 /* It's complicated... */
334 ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
335 break;
336 }
337 }
338 }
339 EXPORT_SYMBOL(mdio45_ethtool_gset_npage);
340
341 /**
342 * mdio45_ethtool_ksettings_get_npage - get settings for ETHTOOL_GLINKSETTINGS
343 * @mdio: MDIO interface
344 * @cmd: Ethtool request structure
345 * @npage_adv: Modes currently advertised on next pages
346 * @npage_lpa: Modes advertised by link partner on next pages
347 *
348 * The @cmd parameter is expected to have been cleared before calling
349 * mdio45_ethtool_ksettings_get_npage().
350 *
351 * Since the CSRs for auto-negotiation using next pages are not fully
352 * standardised, this function does not attempt to decode them. The
353 * caller must pass them in.
354 */
mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info * mdio,struct ethtool_link_ksettings * cmd,u32 npage_adv,u32 npage_lpa)355 void mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
356 struct ethtool_link_ksettings *cmd,
357 u32 npage_adv, u32 npage_lpa)
358 {
359 int reg;
360 u32 speed, supported = 0, advertising = 0, lp_advertising = 0;
361
362 BUILD_BUG_ON(MDIO_SUPPORTS_C22 != ETH_MDIO_SUPPORTS_C22);
363 BUILD_BUG_ON(MDIO_SUPPORTS_C45 != ETH_MDIO_SUPPORTS_C45);
364
365 cmd->base.phy_address = mdio->prtad;
366 cmd->base.mdio_support =
367 mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
368
369 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
370 MDIO_CTRL2);
371 switch (reg & MDIO_PMA_CTRL2_TYPE) {
372 case MDIO_PMA_CTRL2_10GBT:
373 case MDIO_PMA_CTRL2_1000BT:
374 case MDIO_PMA_CTRL2_100BTX:
375 case MDIO_PMA_CTRL2_10BT:
376 cmd->base.port = PORT_TP;
377 supported = SUPPORTED_TP;
378 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
379 MDIO_SPEED);
380 if (reg & MDIO_SPEED_10G)
381 supported |= SUPPORTED_10000baseT_Full;
382 if (reg & MDIO_PMA_SPEED_1000)
383 supported |= (SUPPORTED_1000baseT_Full |
384 SUPPORTED_1000baseT_Half);
385 if (reg & MDIO_PMA_SPEED_100)
386 supported |= (SUPPORTED_100baseT_Full |
387 SUPPORTED_100baseT_Half);
388 if (reg & MDIO_PMA_SPEED_10)
389 supported |= (SUPPORTED_10baseT_Full |
390 SUPPORTED_10baseT_Half);
391 advertising = ADVERTISED_TP;
392 break;
393
394 case MDIO_PMA_CTRL2_10GBCX4:
395 cmd->base.port = PORT_OTHER;
396 supported = 0;
397 advertising = 0;
398 break;
399
400 case MDIO_PMA_CTRL2_10GBKX4:
401 case MDIO_PMA_CTRL2_10GBKR:
402 case MDIO_PMA_CTRL2_1000BKX:
403 cmd->base.port = PORT_OTHER;
404 supported = SUPPORTED_Backplane;
405 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
406 MDIO_PMA_EXTABLE);
407 if (reg & MDIO_PMA_EXTABLE_10GBKX4)
408 supported |= SUPPORTED_10000baseKX4_Full;
409 if (reg & MDIO_PMA_EXTABLE_10GBKR)
410 supported |= SUPPORTED_10000baseKR_Full;
411 if (reg & MDIO_PMA_EXTABLE_1000BKX)
412 supported |= SUPPORTED_1000baseKX_Full;
413 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
414 MDIO_PMA_10GBR_FECABLE);
415 if (reg & MDIO_PMA_10GBR_FECABLE_ABLE)
416 supported |= SUPPORTED_10000baseR_FEC;
417 advertising = ADVERTISED_Backplane;
418 break;
419
420 /* All the other defined modes are flavours of optical */
421 default:
422 cmd->base.port = PORT_FIBRE;
423 supported = SUPPORTED_FIBRE;
424 advertising = ADVERTISED_FIBRE;
425 break;
426 }
427
428 if (mdio->mmds & MDIO_DEVS_AN) {
429 supported |= SUPPORTED_Autoneg;
430 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
431 MDIO_CTRL1);
432 if (reg & MDIO_AN_CTRL1_ENABLE) {
433 cmd->base.autoneg = AUTONEG_ENABLE;
434 advertising |=
435 ADVERTISED_Autoneg |
436 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
437 npage_adv;
438 } else {
439 cmd->base.autoneg = AUTONEG_DISABLE;
440 }
441 } else {
442 cmd->base.autoneg = AUTONEG_DISABLE;
443 }
444
445 if (cmd->base.autoneg) {
446 u32 modes = 0;
447 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
448 MDIO_MMD_AN, MDIO_STAT1);
449
450 /* If AN is complete and successful, report best common
451 * mode, otherwise report best advertised mode.
452 */
453 if (an_stat & MDIO_AN_STAT1_COMPLETE) {
454 lp_advertising =
455 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
456 if (an_stat & MDIO_AN_STAT1_LPABLE)
457 lp_advertising |= ADVERTISED_Autoneg;
458 modes = advertising & lp_advertising;
459 }
460 if ((modes & ~ADVERTISED_Autoneg) == 0)
461 modes = advertising;
462
463 if (modes & (ADVERTISED_10000baseT_Full |
464 ADVERTISED_10000baseKX4_Full |
465 ADVERTISED_10000baseKR_Full)) {
466 speed = SPEED_10000;
467 cmd->base.duplex = DUPLEX_FULL;
468 } else if (modes & (ADVERTISED_1000baseT_Full |
469 ADVERTISED_1000baseT_Half |
470 ADVERTISED_1000baseKX_Full)) {
471 speed = SPEED_1000;
472 cmd->base.duplex = !(modes & ADVERTISED_1000baseT_Half);
473 } else if (modes & (ADVERTISED_100baseT_Full |
474 ADVERTISED_100baseT_Half)) {
475 speed = SPEED_100;
476 cmd->base.duplex = !!(modes & ADVERTISED_100baseT_Full);
477 } else {
478 speed = SPEED_10;
479 cmd->base.duplex = !!(modes & ADVERTISED_10baseT_Full);
480 }
481 } else {
482 /* Report forced settings */
483 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
484 MDIO_CTRL1);
485 speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1)
486 * ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
487 cmd->base.duplex = (reg & MDIO_CTRL1_FULLDPLX ||
488 speed == SPEED_10000);
489 }
490
491 cmd->base.speed = speed;
492
493 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
494 supported);
495 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
496 advertising);
497 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
498 lp_advertising);
499
500 /* 10GBASE-T MDI/MDI-X */
501 if (cmd->base.port == PORT_TP && (cmd->base.speed == SPEED_10000)) {
502 switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
503 MDIO_PMA_10GBT_SWAPPOL)) {
504 case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
505 cmd->base.eth_tp_mdix = ETH_TP_MDI;
506 break;
507 case 0:
508 cmd->base.eth_tp_mdix = ETH_TP_MDI_X;
509 break;
510 default:
511 /* It's complicated... */
512 cmd->base.eth_tp_mdix = ETH_TP_MDI_INVALID;
513 break;
514 }
515 }
516 }
517 EXPORT_SYMBOL(mdio45_ethtool_ksettings_get_npage);
518
519 /**
520 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
521 * @mdio: MDIO interface
522 * @mii_data: MII ioctl data structure
523 * @cmd: MII ioctl command
524 *
525 * Returns 0 on success, negative on error.
526 */
mdio_mii_ioctl(const struct mdio_if_info * mdio,struct mii_ioctl_data * mii_data,int cmd)527 int mdio_mii_ioctl(const struct mdio_if_info *mdio,
528 struct mii_ioctl_data *mii_data, int cmd)
529 {
530 int prtad, devad;
531 u16 addr = mii_data->reg_num;
532
533 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */
534 switch (cmd) {
535 case SIOCGMIIPHY:
536 if (mdio->prtad == MDIO_PRTAD_NONE)
537 return -EOPNOTSUPP;
538 mii_data->phy_id = mdio->prtad;
539 cmd = SIOCGMIIREG;
540 break;
541 case SIOCGMIIREG:
542 case SIOCSMIIREG:
543 break;
544 default:
545 return -EOPNOTSUPP;
546 }
547
548 /* Validate/convert phy_id */
549 if ((mdio->mode_support & MDIO_SUPPORTS_C45) &&
550 mdio_phy_id_is_c45(mii_data->phy_id)) {
551 prtad = mdio_phy_id_prtad(mii_data->phy_id);
552 devad = mdio_phy_id_devad(mii_data->phy_id);
553 } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) &&
554 mii_data->phy_id < 0x20) {
555 prtad = mii_data->phy_id;
556 devad = MDIO_DEVAD_NONE;
557 addr &= 0x1f;
558 } else if ((mdio->mode_support & MDIO_EMULATE_C22) &&
559 mdio->prtad != MDIO_PRTAD_NONE &&
560 mii_data->phy_id == mdio->prtad) {
561 /* Remap commonly-used MII registers. */
562 prtad = mdio->prtad;
563 switch (addr) {
564 case MII_BMCR:
565 case MII_BMSR:
566 case MII_PHYSID1:
567 case MII_PHYSID2:
568 devad = __ffs(mdio->mmds);
569 break;
570 case MII_ADVERTISE:
571 case MII_LPA:
572 if (!(mdio->mmds & MDIO_DEVS_AN))
573 return -EINVAL;
574 devad = MDIO_MMD_AN;
575 if (addr == MII_ADVERTISE)
576 addr = MDIO_AN_ADVERTISE;
577 else
578 addr = MDIO_AN_LPA;
579 break;
580 default:
581 return -EINVAL;
582 }
583 } else {
584 return -EINVAL;
585 }
586
587 if (cmd == SIOCGMIIREG) {
588 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
589 if (rc < 0)
590 return rc;
591 mii_data->val_out = rc;
592 return 0;
593 } else {
594 return mdio->mdio_write(mdio->dev, prtad, devad, addr,
595 mii_data->val_in);
596 }
597 }
598 EXPORT_SYMBOL(mdio_mii_ioctl);
599
