2 * mdio.c: Generic support for MDIO-compatible transceivers
3 * Copyright 2006-2009 Solarflare Communications Inc.
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.
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>
18 * mdio45_probe - probe for an MDIO (clause 45) device
19 * @mdio: MDIO interface
20 * @prtad: Expected PHY address
22 * This sets @prtad and @mmds in the MDIO interface if successful.
23 * Returns 0 on success, negative on error.
25 int mdio45_probe(struct mdio_if_info *mdio, int prtad)
27 int mmd, stat2, devs1, devs2;
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);
35 (stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
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)
45 mdio->mmds = devs1 | (devs2 << 16);
51 EXPORT_SYMBOL(mdio45_probe);
54 * mdio_set_flag - set or clear flag in an MDIO register
55 * @mdio: MDIO interface
58 * @addr: Register address
59 * @mask: Mask for flag (single bit set)
60 * @sense: New value of flag
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.
65 int mdio_set_flag(const struct mdio_if_info *mdio,
66 int prtad, int devad, u16 addr, int mask,
69 int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
75 new_val = old_val | mask;
77 new_val = old_val & ~mask;
78 if (old_val == new_val)
80 return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
82 EXPORT_SYMBOL(mdio_set_flag);
85 * mdio_link_ok - is link status up/OK
86 * @mdio: MDIO interface
87 * @mmd_mask: Mask for MMDs to check
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.
93 int mdio45_links_ok(const struct mdio_if_info *mdio, u32 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);
104 for (devad = 0; mmd_mask; devad++) {
105 if (mmd_mask & (1 << devad)) {
106 mmd_mask &= ~(1 << devad);
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,
112 reg = mdio->mdio_read(mdio->dev, mdio->prtad,
114 if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
121 EXPORT_SYMBOL(mdio45_links_ok);
124 * mdio45_nway_restart - restart auto-negotiation for this interface
125 * @mdio: MDIO interface
127 * Returns 0 on success, negative on error.
129 int mdio45_nway_restart(const struct mdio_if_info *mdio)
131 if (!(mdio->mmds & MDIO_DEVS_AN))
134 mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
135 MDIO_AN_CTRL1_RESTART, true);
138 EXPORT_SYMBOL(mdio45_nway_restart);
140 static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
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;
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
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.
168 void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
169 struct ethtool_cmd *ecmd,
170 u32 npage_adv, u32 npage_lpa)
174 ecmd->transceiver = XCVR_INTERNAL;
175 ecmd->phy_address = mdio->prtad;
177 mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
179 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
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,
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;
204 case MDIO_PMA_CTRL2_10GBCX4:
205 ecmd->port = PORT_OTHER;
207 ecmd->advertising = 0;
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,
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;
230 /* All the other defined modes are flavours of optical */
232 ecmd->port = PORT_FIBRE;
233 ecmd->supported = SUPPORTED_FIBRE;
234 ecmd->advertising = ADVERTISED_FIBRE;
238 if (mdio->mmds & MDIO_DEVS_AN) {
239 ecmd->supported |= SUPPORTED_Autoneg;
240 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
242 if (reg & MDIO_AN_CTRL1_ENABLE) {
243 ecmd->autoneg = AUTONEG_ENABLE;
246 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
249 ecmd->autoneg = AUTONEG_DISABLE;
252 ecmd->autoneg = AUTONEG_DISABLE;
257 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
258 MDIO_MMD_AN, MDIO_STAT1);
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;
269 if ((modes & ~ADVERTISED_Autoneg) == 0)
270 modes = ecmd->advertising;
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);
287 ecmd->speed = SPEED_10;
288 ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
291 /* Report forced settings */
292 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
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);
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;
308 ecmd->eth_tp_mdix = ETH_TP_MDI_X;
311 /* It's complicated... */
312 ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
317 EXPORT_SYMBOL(mdio45_ethtool_gset_npage);
320 * mdio45_ethtool_spauseparam_an - set auto-negotiated pause parameters
321 * @mdio: MDIO interface
322 * @ecmd: Ethtool request structure
324 * This function assumes that the PHY has an auto-negotiation MMD. It
325 * will enable and disable advertising of flow control as appropriate.
327 void mdio45_ethtool_spauseparam_an(const struct mdio_if_info *mdio,
328 const struct ethtool_pauseparam *ecmd)
332 WARN_ON(!(mdio->mmds & MDIO_DEVS_AN));
334 old_adv = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
336 adv = old_adv & ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM);
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);
347 EXPORT_SYMBOL(mdio45_ethtool_spauseparam_an);
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
355 * Returns 0 on success, negative on error.
357 int mdio_mii_ioctl(const struct mdio_if_info *mdio,
358 struct mii_ioctl_data *mii_data, int cmd)
361 u16 addr = mii_data->reg_num;
363 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */
366 if (mdio->prtad == MDIO_PRTAD_NONE)
368 mii_data->phy_id = mdio->prtad;
374 if (!capable(CAP_NET_ADMIN))
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;
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. */
401 devad = __ffs(mdio->mmds);
405 if (!(mdio->mmds & MDIO_DEVS_AN))
408 if (addr == MII_ADVERTISE)
409 addr = MDIO_AN_ADVERTISE;
420 if (cmd == SIOCGMIIREG) {
421 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
424 mii_data->val_out = rc;
427 return mdio->mdio_write(mdio->dev, prtad, devad, addr,
431 EXPORT_SYMBOL(mdio_mii_ioctl);