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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
14MODULE_DESCRIPTION("Generic support for MDIO-compatible transceivers");
15MODULE_AUTHOR("Copyright 2006-2009 Solarflare Communications Inc.");
16MODULE_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 */
26int 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}
52EXPORT_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 */
66int 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}
83EXPORT_SYMBOL(mdio_set_flag);
84
85/**
86 * mdio45_links_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 */
94int 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}
129EXPORT_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 */
137int 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}
146EXPORT_SYMBOL(mdio45_nway_restart);
147
148static 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_ksettings_get_npage - get settings for ETHTOOL_GLINKSETTINGS
171 * @mdio: MDIO interface
172 * @cmd: 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 @cmd parameter is expected to have been cleared before calling
177 * mdio45_ethtool_ksettings_get_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 */
183void mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
184 struct ethtool_link_ksettings *cmd,
185 u32 npage_adv, u32 npage_lpa)
186{
187 int reg;
188 u32 speed, supported = 0, advertising = 0, lp_advertising = 0;
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 cmd->base.phy_address = mdio->prtad;
194 cmd->base.mdio_support =
195 mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
196
197 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
198 MDIO_CTRL2);
199 switch (reg & MDIO_PMA_CTRL2_TYPE) {
200 case MDIO_PMA_CTRL2_10GBT:
201 case MDIO_PMA_CTRL2_1000BT:
202 case MDIO_PMA_CTRL2_100BTX:
203 case MDIO_PMA_CTRL2_10BT:
204 cmd->base.port = PORT_TP;
205 supported = SUPPORTED_TP;
206 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
207 MDIO_SPEED);
208 if (reg & MDIO_SPEED_10G)
209 supported |= SUPPORTED_10000baseT_Full;
210 if (reg & MDIO_PMA_SPEED_1000)
211 supported |= (SUPPORTED_1000baseT_Full |
212 SUPPORTED_1000baseT_Half);
213 if (reg & MDIO_PMA_SPEED_100)
214 supported |= (SUPPORTED_100baseT_Full |
215 SUPPORTED_100baseT_Half);
216 if (reg & MDIO_PMA_SPEED_10)
217 supported |= (SUPPORTED_10baseT_Full |
218 SUPPORTED_10baseT_Half);
219 advertising = ADVERTISED_TP;
220 break;
221
222 case MDIO_PMA_CTRL2_10GBCX4:
223 cmd->base.port = PORT_OTHER;
224 supported = 0;
225 advertising = 0;
226 break;
227
228 case MDIO_PMA_CTRL2_10GBKX4:
229 case MDIO_PMA_CTRL2_10GBKR:
230 case MDIO_PMA_CTRL2_1000BKX:
231 cmd->base.port = PORT_OTHER;
232 supported = SUPPORTED_Backplane;
233 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
234 MDIO_PMA_EXTABLE);
235 if (reg & MDIO_PMA_EXTABLE_10GBKX4)
236 supported |= SUPPORTED_10000baseKX4_Full;
237 if (reg & MDIO_PMA_EXTABLE_10GBKR)
238 supported |= SUPPORTED_10000baseKR_Full;
239 if (reg & MDIO_PMA_EXTABLE_1000BKX)
240 supported |= SUPPORTED_1000baseKX_Full;
241 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
242 MDIO_PMA_10GBR_FECABLE);
243 if (reg & MDIO_PMA_10GBR_FECABLE_ABLE)
244 supported |= SUPPORTED_10000baseR_FEC;
245 advertising = ADVERTISED_Backplane;
246 break;
247
248 /* All the other defined modes are flavours of optical */
249 default:
250 cmd->base.port = PORT_FIBRE;
251 supported = SUPPORTED_FIBRE;
252 advertising = ADVERTISED_FIBRE;
253 break;
254 }
255
256 if (mdio->mmds & MDIO_DEVS_AN) {
257 supported |= SUPPORTED_Autoneg;
258 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
259 MDIO_CTRL1);
260 if (reg & MDIO_AN_CTRL1_ENABLE) {
261 cmd->base.autoneg = AUTONEG_ENABLE;
262 advertising |=
263 ADVERTISED_Autoneg |
264 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
265 npage_adv;
266 } else {
267 cmd->base.autoneg = AUTONEG_DISABLE;
268 }
269 } else {
270 cmd->base.autoneg = AUTONEG_DISABLE;
271 }
272
273 if (cmd->base.autoneg) {
274 u32 modes = 0;
275 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
276 MDIO_MMD_AN, MDIO_STAT1);
277
278 /* If AN is complete and successful, report best common
279 * mode, otherwise report best advertised mode.
280 */
281 if (an_stat & MDIO_AN_STAT1_COMPLETE) {
282 lp_advertising =
283 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
284 if (an_stat & MDIO_AN_STAT1_LPABLE)
285 lp_advertising |= ADVERTISED_Autoneg;
286 modes = advertising & lp_advertising;
287 }
288 if ((modes & ~ADVERTISED_Autoneg) == 0)
289 modes = advertising;
290
291 if (modes & (ADVERTISED_10000baseT_Full |
292 ADVERTISED_10000baseKX4_Full |
293 ADVERTISED_10000baseKR_Full)) {
294 speed = SPEED_10000;
295 cmd->base.duplex = DUPLEX_FULL;
296 } else if (modes & (ADVERTISED_1000baseT_Full |
297 ADVERTISED_1000baseT_Half |
298 ADVERTISED_1000baseKX_Full)) {
299 speed = SPEED_1000;
300 cmd->base.duplex = !(modes & ADVERTISED_1000baseT_Half);
301 } else if (modes & (ADVERTISED_100baseT_Full |
302 ADVERTISED_100baseT_Half)) {
303 speed = SPEED_100;
304 cmd->base.duplex = !!(modes & ADVERTISED_100baseT_Full);
305 } else {
306 speed = SPEED_10;
307 cmd->base.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 cmd->base.duplex = (reg & MDIO_CTRL1_FULLDPLX ||
316 speed == SPEED_10000);
317 }
318
319 cmd->base.speed = speed;
320
321 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
322 supported);
323 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
324 advertising);
325 ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
326 lp_advertising);
327
328 /* 10GBASE-T MDI/MDI-X */
329 if (cmd->base.port == PORT_TP && (cmd->base.speed == SPEED_10000)) {
330 switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
331 MDIO_PMA_10GBT_SWAPPOL)) {
332 case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
333 cmd->base.eth_tp_mdix = ETH_TP_MDI;
334 break;
335 case 0:
336 cmd->base.eth_tp_mdix = ETH_TP_MDI_X;
337 break;
338 default:
339 /* It's complicated... */
340 cmd->base.eth_tp_mdix = ETH_TP_MDI_INVALID;
341 break;
342 }
343 }
344}
345EXPORT_SYMBOL(mdio45_ethtool_ksettings_get_npage);
346
347/**
348 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
349 * @mdio: MDIO interface
350 * @mii_data: MII ioctl data structure
351 * @cmd: MII ioctl command
352 *
353 * Returns 0 on success, negative on error.
354 */
355int mdio_mii_ioctl(const struct mdio_if_info *mdio,
356 struct mii_ioctl_data *mii_data, int cmd)
357{
358 int prtad, devad;
359 u16 addr = mii_data->reg_num;
360
361 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */
362 switch (cmd) {
363 case SIOCGMIIPHY:
364 if (mdio->prtad == MDIO_PRTAD_NONE)
365 return -EOPNOTSUPP;
366 mii_data->phy_id = mdio->prtad;
367 cmd = SIOCGMIIREG;
368 break;
369 case SIOCGMIIREG:
370 case SIOCSMIIREG:
371 break;
372 default:
373 return -EOPNOTSUPP;
374 }
375
376 /* Validate/convert phy_id */
377 if ((mdio->mode_support & MDIO_SUPPORTS_C45) &&
378 mdio_phy_id_is_c45(mii_data->phy_id)) {
379 prtad = mdio_phy_id_prtad(mii_data->phy_id);
380 devad = mdio_phy_id_devad(mii_data->phy_id);
381 } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) &&
382 mii_data->phy_id < 0x20) {
383 prtad = mii_data->phy_id;
384 devad = MDIO_DEVAD_NONE;
385 addr &= 0x1f;
386 } else if ((mdio->mode_support & MDIO_EMULATE_C22) &&
387 mdio->prtad != MDIO_PRTAD_NONE &&
388 mii_data->phy_id == mdio->prtad) {
389 /* Remap commonly-used MII registers. */
390 prtad = mdio->prtad;
391 switch (addr) {
392 case MII_BMCR:
393 case MII_BMSR:
394 case MII_PHYSID1:
395 case MII_PHYSID2:
396 devad = __ffs(mdio->mmds);
397 break;
398 case MII_ADVERTISE:
399 case MII_LPA:
400 if (!(mdio->mmds & MDIO_DEVS_AN))
401 return -EINVAL;
402 devad = MDIO_MMD_AN;
403 if (addr == MII_ADVERTISE)
404 addr = MDIO_AN_ADVERTISE;
405 else
406 addr = MDIO_AN_LPA;
407 break;
408 default:
409 return -EINVAL;
410 }
411 } else {
412 return -EINVAL;
413 }
414
415 if (cmd == SIOCGMIIREG) {
416 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
417 if (rc < 0)
418 return rc;
419 mii_data->val_out = rc;
420 return 0;
421 } else {
422 return mdio->mdio_write(mdio->dev, prtad, devad, addr,
423 mii_data->val_in);
424 }
425}
426EXPORT_SYMBOL(mdio_mii_ioctl);