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-rw-r--r--drivers/net/mdio.c431
1 files changed, 431 insertions, 0 deletions
diff --git a/drivers/net/mdio.c b/drivers/net/mdio.c
new file mode 100644
index 000000000000..dc45e9856c35
--- /dev/null
+++ b/drivers/net/mdio.c
@@ -0,0 +1,431 @@
1/*
2 * mdio.c: Generic support for MDIO-compatible transceivers
3 * Copyright 2006-2009 Solarflare Communications Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation, incorporated herein by reference.
8 */
9
10#include <linux/kernel.h>
11#include <linux/capability.h>
12#include <linux/errno.h>
13#include <linux/ethtool.h>
14#include <linux/mdio.h>
15#include <linux/module.h>
16
17/**
18 * mdio45_probe - probe for an MDIO (clause 45) device
19 * @mdio: MDIO interface
20 * @prtad: Expected PHY address
21 *
22 * This sets @prtad and @mmds in the MDIO interface if successful.
23 * Returns 0 on success, negative on error.
24 */
25int mdio45_probe(struct mdio_if_info *mdio, int prtad)
26{
27 int mmd, stat2, devs1, devs2;
28
29 /* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
30 * XS or DTE XS; give up if none is present. */
31 for (mmd = 1; mmd <= 5; mmd++) {
32 /* Is this MMD present? */
33 stat2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_STAT2);
34 if (stat2 < 0 ||
35 (stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
36 continue;
37
38 /* It should tell us about all the other MMDs */
39 devs1 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS1);
40 devs2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS2);
41 if (devs1 < 0 || devs2 < 0)
42 continue;
43
44 mdio->prtad = prtad;
45 mdio->mmds = devs1 | (devs2 << 16);
46 return 0;
47 }
48
49 return -ENODEV;
50}
51EXPORT_SYMBOL(mdio45_probe);
52
53/**
54 * mdio_set_flag - set or clear flag in an MDIO register
55 * @mdio: MDIO interface
56 * @prtad: PHY address
57 * @devad: MMD address
58 * @addr: Register address
59 * @mask: Mask for flag (single bit set)
60 * @sense: New value of flag
61 *
62 * This debounces changes: it does not write the register if the flag
63 * already has the proper value. Returns 0 on success, negative on error.
64 */
65int mdio_set_flag(const struct mdio_if_info *mdio,
66 int prtad, int devad, u16 addr, int mask,
67 bool sense)
68{
69 int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
70 int new_val;
71
72 if (old_val < 0)
73 return old_val;
74 if (sense)
75 new_val = old_val | mask;
76 else
77 new_val = old_val & ~mask;
78 if (old_val == new_val)
79 return 0;
80 return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
81}
82EXPORT_SYMBOL(mdio_set_flag);
83
84/**
85 * mdio_link_ok - is link status up/OK
86 * @mdio: MDIO interface
87 * @mmd_mask: Mask for MMDs to check
88 *
89 * Returns 1 if the PHY reports link status up/OK, 0 otherwise.
90 * @mmd_mask is normally @mdio->mmds, but if loopback is enabled
91 * the MMDs being bypassed should be excluded from the mask.
92 */
93int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmd_mask)
94{
95 int devad, reg;
96
97 if (!mmd_mask) {
98 /* Use absence of XGMII faults in lieu of link state */
99 reg = mdio->mdio_read(mdio->dev, mdio->prtad,
100 MDIO_MMD_PHYXS, MDIO_STAT2);
101 return reg >= 0 && !(reg & MDIO_STAT2_RXFAULT);
102 }
103
104 for (devad = 0; mmd_mask; devad++) {
105 if (mmd_mask & (1 << devad)) {
106 mmd_mask &= ~(1 << devad);
107
108 /* Read twice because link state is latched and a
109 * read moves the current state into the register */
110 mdio->mdio_read(mdio->dev, mdio->prtad,
111 devad, MDIO_STAT1);
112 reg = mdio->mdio_read(mdio->dev, mdio->prtad,
113 devad, MDIO_STAT1);
114 if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
115 return false;
116 }
117 }
118
119 return true;
120}
121EXPORT_SYMBOL(mdio45_links_ok);
122
123/**
124 * mdio45_nway_restart - restart auto-negotiation for this interface
125 * @mdio: MDIO interface
126 *
127 * Returns 0 on success, negative on error.
128 */
129int mdio45_nway_restart(const struct mdio_if_info *mdio)
130{
131 if (!(mdio->mmds & MDIO_DEVS_AN))
132 return -EOPNOTSUPP;
133
134 mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
135 MDIO_AN_CTRL1_RESTART, true);
136 return 0;
137}
138EXPORT_SYMBOL(mdio45_nway_restart);
139
140static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
141{
142 u32 result = 0;
143 int reg;
144
145 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
146 if (reg & ADVERTISE_10HALF)
147 result |= ADVERTISED_10baseT_Half;
148 if (reg & ADVERTISE_10FULL)
149 result |= ADVERTISED_10baseT_Full;
150 if (reg & ADVERTISE_100HALF)
151 result |= ADVERTISED_100baseT_Half;
152 if (reg & ADVERTISE_100FULL)
153 result |= ADVERTISED_100baseT_Full;
154 return result;
155}
156
157/**
158 * mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
159 * @mdio: MDIO interface
160 * @ecmd: Ethtool request structure
161 * @npage_adv: Modes currently advertised on next pages
162 * @npage_lpa: Modes advertised by link partner on next pages
163 *
164 * Since the CSRs for auto-negotiation using next pages are not fully
165 * standardised, this function does not attempt to decode them. The
166 * caller must pass them in.
167 */
168void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
169 struct ethtool_cmd *ecmd,
170 u32 npage_adv, u32 npage_lpa)
171{
172 int reg;
173
174 ecmd->transceiver = XCVR_INTERNAL;
175 ecmd->phy_address = mdio->prtad;
176 ecmd->mdio_support =
177 mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
178
179 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
180 MDIO_CTRL2);
181 switch (reg & MDIO_PMA_CTRL2_TYPE) {
182 case MDIO_PMA_CTRL2_10GBT:
183 case MDIO_PMA_CTRL2_1000BT:
184 case MDIO_PMA_CTRL2_100BTX:
185 case MDIO_PMA_CTRL2_10BT:
186 ecmd->port = PORT_TP;
187 ecmd->supported = SUPPORTED_TP;
188 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
189 MDIO_SPEED);
190 if (reg & MDIO_SPEED_10G)
191 ecmd->supported |= SUPPORTED_10000baseT_Full;
192 if (reg & MDIO_PMA_SPEED_1000)
193 ecmd->supported |= (SUPPORTED_1000baseT_Full |
194 SUPPORTED_1000baseT_Half);
195 if (reg & MDIO_PMA_SPEED_100)
196 ecmd->supported |= (SUPPORTED_100baseT_Full |
197 SUPPORTED_100baseT_Half);
198 if (reg & MDIO_PMA_SPEED_10)
199 ecmd->supported |= (SUPPORTED_10baseT_Full |
200 SUPPORTED_10baseT_Half);
201 ecmd->advertising = ADVERTISED_TP;
202 break;
203
204 case MDIO_PMA_CTRL2_10GBCX4:
205 ecmd->port = PORT_OTHER;
206 ecmd->supported = 0;
207 ecmd->advertising = 0;
208 break;
209
210 case MDIO_PMA_CTRL2_10GBKX4:
211 case MDIO_PMA_CTRL2_10GBKR:
212 case MDIO_PMA_CTRL2_1000BKX:
213 ecmd->port = PORT_OTHER;
214 ecmd->supported = SUPPORTED_Backplane;
215 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
216 MDIO_PMA_EXTABLE);
217 if (reg & MDIO_PMA_EXTABLE_10GBKX4)
218 ecmd->supported |= SUPPORTED_10000baseKX4_Full;
219 if (reg & MDIO_PMA_EXTABLE_10GBKR)
220 ecmd->supported |= SUPPORTED_10000baseKR_Full;
221 if (reg & MDIO_PMA_EXTABLE_1000BKX)
222 ecmd->supported |= SUPPORTED_1000baseKX_Full;
223 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
224 MDIO_PMA_10GBR_FECABLE);
225 if (reg & MDIO_PMA_10GBR_FECABLE_ABLE)
226 ecmd->supported |= SUPPORTED_10000baseR_FEC;
227 ecmd->advertising = ADVERTISED_Backplane;
228 break;
229
230 /* All the other defined modes are flavours of optical */
231 default:
232 ecmd->port = PORT_FIBRE;
233 ecmd->supported = SUPPORTED_FIBRE;
234 ecmd->advertising = ADVERTISED_FIBRE;
235 break;
236 }
237
238 if (mdio->mmds & MDIO_DEVS_AN) {
239 ecmd->supported |= SUPPORTED_Autoneg;
240 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
241 MDIO_CTRL1);
242 if (reg & MDIO_AN_CTRL1_ENABLE) {
243 ecmd->autoneg = AUTONEG_ENABLE;
244 ecmd->advertising |=
245 ADVERTISED_Autoneg |
246 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
247 npage_adv;
248 } else {
249 ecmd->autoneg = AUTONEG_DISABLE;
250 }
251 } else {
252 ecmd->autoneg = AUTONEG_DISABLE;
253 }
254
255 if (ecmd->autoneg) {
256 u32 modes = 0;
257 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
258 MDIO_MMD_AN, MDIO_STAT1);
259
260 /* If AN is complete and successful, report best common
261 * mode, otherwise report best advertised mode. */
262 if (an_stat & MDIO_AN_STAT1_COMPLETE) {
263 ecmd->lp_advertising =
264 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
265 if (an_stat & MDIO_AN_STAT1_LPABLE)
266 ecmd->lp_advertising |= ADVERTISED_Autoneg;
267 modes = ecmd->advertising & ecmd->lp_advertising;
268 }
269 if ((modes & ~ADVERTISED_Autoneg) == 0)
270 modes = ecmd->advertising;
271
272 if (modes & (ADVERTISED_10000baseT_Full |
273 ADVERTISED_10000baseKX4_Full |
274 ADVERTISED_10000baseKR_Full)) {
275 ecmd->speed = SPEED_10000;
276 ecmd->duplex = DUPLEX_FULL;
277 } else if (modes & (ADVERTISED_1000baseT_Full |
278 ADVERTISED_1000baseT_Half |
279 ADVERTISED_1000baseKX_Full)) {
280 ecmd->speed = SPEED_1000;
281 ecmd->duplex = !(modes & ADVERTISED_1000baseT_Half);
282 } else if (modes & (ADVERTISED_100baseT_Full |
283 ADVERTISED_100baseT_Half)) {
284 ecmd->speed = SPEED_100;
285 ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full);
286 } else {
287 ecmd->speed = SPEED_10;
288 ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
289 }
290 } else {
291 /* Report forced settings */
292 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
293 MDIO_CTRL1);
294 ecmd->speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) *
295 ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
296 ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX ||
297 ecmd->speed == SPEED_10000);
298 }
299
300 /* 10GBASE-T MDI/MDI-X */
301 if (ecmd->port == PORT_TP && ecmd->speed == SPEED_10000) {
302 switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
303 MDIO_PMA_10GBT_SWAPPOL)) {
304 case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
305 ecmd->eth_tp_mdix = ETH_TP_MDI;
306 break;
307 case 0:
308 ecmd->eth_tp_mdix = ETH_TP_MDI_X;
309 break;
310 default:
311 /* It's complicated... */
312 ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
313 break;
314 }
315 }
316}
317EXPORT_SYMBOL(mdio45_ethtool_gset_npage);
318
319/**
320 * mdio45_ethtool_spauseparam_an - set auto-negotiated pause parameters
321 * @mdio: MDIO interface
322 * @ecmd: Ethtool request structure
323 *
324 * This function assumes that the PHY has an auto-negotiation MMD. It
325 * will enable and disable advertising of flow control as appropriate.
326 */
327void mdio45_ethtool_spauseparam_an(const struct mdio_if_info *mdio,
328 const struct ethtool_pauseparam *ecmd)
329{
330 int adv, old_adv;
331
332 WARN_ON(!(mdio->mmds & MDIO_DEVS_AN));
333
334 old_adv = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
335 MDIO_AN_ADVERTISE);
336 adv = old_adv & ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM);
337 if (ecmd->autoneg)
338 adv |= mii_advertise_flowctrl(
339 (ecmd->rx_pause ? FLOW_CTRL_RX : 0) |
340 (ecmd->tx_pause ? FLOW_CTRL_TX : 0));
341 if (adv != old_adv) {
342 mdio->mdio_write(mdio->dev, mdio->prtad, MDIO_MMD_AN,
343 MDIO_AN_ADVERTISE, adv);
344 mdio45_nway_restart(mdio);
345 }
346}
347EXPORT_SYMBOL(mdio45_ethtool_spauseparam_an);
348
349/**
350 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
351 * @mdio: MDIO interface
352 * @mii_data: MII ioctl data structure
353 * @cmd: MII ioctl command
354 *
355 * Returns 0 on success, negative on error.
356 */
357int mdio_mii_ioctl(const struct mdio_if_info *mdio,
358 struct mii_ioctl_data *mii_data, int cmd)
359{
360 int prtad, devad;
361 u16 addr = mii_data->reg_num;
362
363 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */
364 switch (cmd) {
365 case SIOCGMIIPHY:
366 if (mdio->prtad == MDIO_PRTAD_NONE)
367 return -EOPNOTSUPP;
368 mii_data->phy_id = mdio->prtad;
369 cmd = SIOCGMIIREG;
370 break;
371 case SIOCGMIIREG:
372 break;
373 case SIOCSMIIREG:
374 if (!capable(CAP_NET_ADMIN))
375 return -EPERM;
376 break;
377 default:
378 return -EOPNOTSUPP;
379 }
380
381 /* Validate/convert phy_id */
382 if ((mdio->mode_support & MDIO_SUPPORTS_C45) &&
383 mdio_phy_id_is_c45(mii_data->phy_id)) {
384 prtad = mdio_phy_id_prtad(mii_data->phy_id);
385 devad = mdio_phy_id_devad(mii_data->phy_id);
386 } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) &&
387 mii_data->phy_id < 0x20) {
388 prtad = mii_data->phy_id;
389 devad = MDIO_DEVAD_NONE;
390 addr &= 0x1f;
391 } else if ((mdio->mode_support & MDIO_EMULATE_C22) &&
392 mdio->prtad != MDIO_PRTAD_NONE &&
393 mii_data->phy_id == mdio->prtad) {
394 /* Remap commonly-used MII registers. */
395 prtad = mdio->prtad;
396 switch (addr) {
397 case MII_BMCR:
398 case MII_BMSR:
399 case MII_PHYSID1:
400 case MII_PHYSID2:
401 devad = __ffs(mdio->mmds);
402 break;
403 case MII_ADVERTISE:
404 case MII_LPA:
405 if (!(mdio->mmds & MDIO_DEVS_AN))
406 return -EINVAL;
407 devad = MDIO_MMD_AN;
408 if (addr == MII_ADVERTISE)
409 addr = MDIO_AN_ADVERTISE;
410 else
411 addr = MDIO_AN_LPA;
412 break;
413 default:
414 return -EINVAL;
415 }
416 } else {
417 return -EINVAL;
418 }
419
420 if (cmd == SIOCGMIIREG) {
421 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
422 if (rc < 0)
423 return rc;
424 mii_data->val_out = rc;
425 return 0;
426 } else {
427 return mdio->mdio_write(mdio->dev, prtad, devad, addr,
428 mii_data->val_in);
429 }
430}
431EXPORT_SYMBOL(mdio_mii_ioctl);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-24 04:45:27 -0500