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>
17 MODULE_DESCRIPTION("Generic support for MDIO-compatible transceivers");
18 MODULE_AUTHOR("Copyright 2006-2009 Solarflare Communications Inc.");
19 MODULE_LICENSE("GPL");
22 * mdio45_probe - probe for an MDIO (clause 45) device
23 * @mdio: MDIO interface
24 * @prtad: Expected PHY address
26 * This sets @prtad and @mmds in the MDIO interface if successful.
27 * Returns 0 on success, negative on error.
29 int mdio45_probe(struct mdio_if_info *mdio, int prtad)
31 int mmd, stat2, devs1, devs2;
33 /* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
34 * XS or DTE XS; give up if none is present. */
35 for (mmd = 1; mmd <= 5; mmd++) {
36 /* Is this MMD present? */
37 stat2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_STAT2);
39 (stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
42 /* It should tell us about all the other MMDs */
43 devs1 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS1);
44 devs2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS2);
45 if (devs1 < 0 || devs2 < 0)
49 mdio->mmds = devs1 | (devs2 << 16);
55 EXPORT_SYMBOL(mdio45_probe);
58 * mdio_set_flag - set or clear flag in an MDIO register
59 * @mdio: MDIO interface
62 * @addr: Register address
63 * @mask: Mask for flag (single bit set)
64 * @sense: New value of flag
66 * This debounces changes: it does not write the register if the flag
67 * already has the proper value. Returns 0 on success, negative on error.
69 int mdio_set_flag(const struct mdio_if_info *mdio,
70 int prtad, int devad, u16 addr, int mask,
73 int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
79 new_val = old_val | mask;
81 new_val = old_val & ~mask;
82 if (old_val == new_val)
84 return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
86 EXPORT_SYMBOL(mdio_set_flag);
89 * mdio_link_ok - is link status up/OK
90 * @mdio: MDIO interface
91 * @mmd_mask: Mask for MMDs to check
93 * Returns 1 if the PHY reports link status up/OK, 0 otherwise.
94 * @mmd_mask is normally @mdio->mmds, but if loopback is enabled
95 * the MMDs being bypassed should be excluded from the mask.
97 int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmd_mask)
102 /* Use absence of XGMII faults in lieu of link state */
103 reg = mdio->mdio_read(mdio->dev, mdio->prtad,
104 MDIO_MMD_PHYXS, MDIO_STAT2);
105 return reg >= 0 && !(reg & MDIO_STAT2_RXFAULT);
108 for (devad = 0; mmd_mask; devad++) {
109 if (mmd_mask & (1 << devad)) {
110 mmd_mask &= ~(1 << devad);
112 /* Reset the latched status and fault flags */
113 mdio->mdio_read(mdio->dev, mdio->prtad,
115 if (devad == MDIO_MMD_PMAPMD || devad == MDIO_MMD_PCS ||
116 devad == MDIO_MMD_PHYXS || devad == MDIO_MMD_DTEXS)
117 mdio->mdio_read(mdio->dev, mdio->prtad,
120 /* Check the current status and fault flags */
121 reg = mdio->mdio_read(mdio->dev, mdio->prtad,
124 (reg & (MDIO_STAT1_FAULT | MDIO_STAT1_LSTATUS)) !=
132 EXPORT_SYMBOL(mdio45_links_ok);
135 * mdio45_nway_restart - restart auto-negotiation for this interface
136 * @mdio: MDIO interface
138 * Returns 0 on success, negative on error.
140 int mdio45_nway_restart(const struct mdio_if_info *mdio)
142 if (!(mdio->mmds & MDIO_DEVS_AN))
145 mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
146 MDIO_AN_CTRL1_RESTART, true);
149 EXPORT_SYMBOL(mdio45_nway_restart);
151 static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
156 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
157 if (reg & ADVERTISE_10HALF)
158 result |= ADVERTISED_10baseT_Half;
159 if (reg & ADVERTISE_10FULL)
160 result |= ADVERTISED_10baseT_Full;
161 if (reg & ADVERTISE_100HALF)
162 result |= ADVERTISED_100baseT_Half;
163 if (reg & ADVERTISE_100FULL)
164 result |= ADVERTISED_100baseT_Full;
165 if (reg & ADVERTISE_PAUSE_CAP)
166 result |= ADVERTISED_Pause;
167 if (reg & ADVERTISE_PAUSE_ASYM)
168 result |= ADVERTISED_Asym_Pause;
173 * mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
174 * @mdio: MDIO interface
175 * @ecmd: Ethtool request structure
176 * @npage_adv: Modes currently advertised on next pages
177 * @npage_lpa: Modes advertised by link partner on next pages
179 * The @ecmd parameter is expected to have been cleared before calling
180 * mdio45_ethtool_gset_npage().
182 * Since the CSRs for auto-negotiation using next pages are not fully
183 * standardised, this function does not attempt to decode them. The
184 * caller must pass them in.
186 void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
187 struct ethtool_cmd *ecmd,
188 u32 npage_adv, u32 npage_lpa)
192 ecmd->transceiver = XCVR_INTERNAL;
193 ecmd->phy_address = mdio->prtad;
195 mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
197 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
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 ecmd->port = PORT_TP;
205 ecmd->supported = SUPPORTED_TP;
206 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
208 if (reg & MDIO_SPEED_10G)
209 ecmd->supported |= SUPPORTED_10000baseT_Full;
210 if (reg & MDIO_PMA_SPEED_1000)
211 ecmd->supported |= (SUPPORTED_1000baseT_Full |
212 SUPPORTED_1000baseT_Half);
213 if (reg & MDIO_PMA_SPEED_100)
214 ecmd->supported |= (SUPPORTED_100baseT_Full |
215 SUPPORTED_100baseT_Half);
216 if (reg & MDIO_PMA_SPEED_10)
217 ecmd->supported |= (SUPPORTED_10baseT_Full |
218 SUPPORTED_10baseT_Half);
219 ecmd->advertising = ADVERTISED_TP;
222 case MDIO_PMA_CTRL2_10GBCX4:
223 ecmd->port = PORT_OTHER;
225 ecmd->advertising = 0;
228 case MDIO_PMA_CTRL2_10GBKX4:
229 case MDIO_PMA_CTRL2_10GBKR:
230 case MDIO_PMA_CTRL2_1000BKX:
231 ecmd->port = PORT_OTHER;
232 ecmd->supported = SUPPORTED_Backplane;
233 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
235 if (reg & MDIO_PMA_EXTABLE_10GBKX4)
236 ecmd->supported |= SUPPORTED_10000baseKX4_Full;
237 if (reg & MDIO_PMA_EXTABLE_10GBKR)
238 ecmd->supported |= SUPPORTED_10000baseKR_Full;
239 if (reg & MDIO_PMA_EXTABLE_1000BKX)
240 ecmd->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 ecmd->supported |= SUPPORTED_10000baseR_FEC;
245 ecmd->advertising = ADVERTISED_Backplane;
248 /* All the other defined modes are flavours of optical */
250 ecmd->port = PORT_FIBRE;
251 ecmd->supported = SUPPORTED_FIBRE;
252 ecmd->advertising = ADVERTISED_FIBRE;
256 if (mdio->mmds & MDIO_DEVS_AN) {
257 ecmd->supported |= SUPPORTED_Autoneg;
258 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
260 if (reg & MDIO_AN_CTRL1_ENABLE) {
261 ecmd->autoneg = AUTONEG_ENABLE;
264 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
267 ecmd->autoneg = AUTONEG_DISABLE;
270 ecmd->autoneg = AUTONEG_DISABLE;
275 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
276 MDIO_MMD_AN, MDIO_STAT1);
278 /* If AN is complete and successful, report best common
279 * mode, otherwise report best advertised mode. */
280 if (an_stat & MDIO_AN_STAT1_COMPLETE) {
281 ecmd->lp_advertising =
282 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
283 if (an_stat & MDIO_AN_STAT1_LPABLE)
284 ecmd->lp_advertising |= ADVERTISED_Autoneg;
285 modes = ecmd->advertising & ecmd->lp_advertising;
287 if ((modes & ~ADVERTISED_Autoneg) == 0)
288 modes = ecmd->advertising;
290 if (modes & (ADVERTISED_10000baseT_Full |
291 ADVERTISED_10000baseKX4_Full |
292 ADVERTISED_10000baseKR_Full)) {
293 ecmd->speed = SPEED_10000;
294 ecmd->duplex = DUPLEX_FULL;
295 } else if (modes & (ADVERTISED_1000baseT_Full |
296 ADVERTISED_1000baseT_Half |
297 ADVERTISED_1000baseKX_Full)) {
298 ecmd->speed = SPEED_1000;
299 ecmd->duplex = !(modes & ADVERTISED_1000baseT_Half);
300 } else if (modes & (ADVERTISED_100baseT_Full |
301 ADVERTISED_100baseT_Half)) {
302 ecmd->speed = SPEED_100;
303 ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full);
305 ecmd->speed = SPEED_10;
306 ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
309 /* Report forced settings */
310 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
312 ecmd->speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) *
313 ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
314 ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX ||
315 ecmd->speed == SPEED_10000);
318 /* 10GBASE-T MDI/MDI-X */
319 if (ecmd->port == PORT_TP && ecmd->speed == SPEED_10000) {
320 switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
321 MDIO_PMA_10GBT_SWAPPOL)) {
322 case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
323 ecmd->eth_tp_mdix = ETH_TP_MDI;
326 ecmd->eth_tp_mdix = ETH_TP_MDI_X;
329 /* It's complicated... */
330 ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
335 EXPORT_SYMBOL(mdio45_ethtool_gset_npage);
338 * mdio45_ethtool_spauseparam_an - set auto-negotiated pause parameters
339 * @mdio: MDIO interface
340 * @ecmd: Ethtool request structure
342 * This function assumes that the PHY has an auto-negotiation MMD. It
343 * will enable and disable advertising of flow control as appropriate.
345 void mdio45_ethtool_spauseparam_an(const struct mdio_if_info *mdio,
346 const struct ethtool_pauseparam *ecmd)
350 WARN_ON(!(mdio->mmds & MDIO_DEVS_AN));
352 old_adv = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
354 adv = ((old_adv & ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM)) |
355 mii_advertise_flowctrl((ecmd->rx_pause ? FLOW_CTRL_RX : 0) |
356 (ecmd->tx_pause ? FLOW_CTRL_TX : 0)));
357 if (adv != old_adv) {
358 mdio->mdio_write(mdio->dev, mdio->prtad, MDIO_MMD_AN,
359 MDIO_AN_ADVERTISE, adv);
360 mdio45_nway_restart(mdio);
363 EXPORT_SYMBOL(mdio45_ethtool_spauseparam_an);
366 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
367 * @mdio: MDIO interface
368 * @mii_data: MII ioctl data structure
369 * @cmd: MII ioctl command
371 * Returns 0 on success, negative on error.
373 int mdio_mii_ioctl(const struct mdio_if_info *mdio,
374 struct mii_ioctl_data *mii_data, int cmd)
377 u16 addr = mii_data->reg_num;
379 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */
382 if (mdio->prtad == MDIO_PRTAD_NONE)
384 mii_data->phy_id = mdio->prtad;
394 /* Validate/convert phy_id */
395 if ((mdio->mode_support & MDIO_SUPPORTS_C45) &&
396 mdio_phy_id_is_c45(mii_data->phy_id)) {
397 prtad = mdio_phy_id_prtad(mii_data->phy_id);
398 devad = mdio_phy_id_devad(mii_data->phy_id);
399 } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) &&
400 mii_data->phy_id < 0x20) {
401 prtad = mii_data->phy_id;
402 devad = MDIO_DEVAD_NONE;
404 } else if ((mdio->mode_support & MDIO_EMULATE_C22) &&
405 mdio->prtad != MDIO_PRTAD_NONE &&
406 mii_data->phy_id == mdio->prtad) {
407 /* Remap commonly-used MII registers. */
414 devad = __ffs(mdio->mmds);
418 if (!(mdio->mmds & MDIO_DEVS_AN))
421 if (addr == MII_ADVERTISE)
422 addr = MDIO_AN_ADVERTISE;
433 if (cmd == SIOCGMIIREG) {
434 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
437 mii_data->val_out = rc;
440 return mdio->mdio_write(mdio->dev, prtad, devad, addr,
444 EXPORT_SYMBOL(mdio_mii_ioctl);