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
;
169 * mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
170 * @mdio: MDIO interface
171 * @ecmd: Ethtool request structure
172 * @npage_adv: Modes currently advertised on next pages
173 * @npage_lpa: Modes advertised by link partner on next pages
175 * Since the CSRs for auto-negotiation using next pages are not fully
176 * standardised, this function does not attempt to decode them. The
177 * caller must pass them in.
179 void mdio45_ethtool_gset_npage(const struct mdio_if_info
*mdio
,
180 struct ethtool_cmd
*ecmd
,
181 u32 npage_adv
, u32 npage_lpa
)
185 ecmd
->transceiver
= XCVR_INTERNAL
;
186 ecmd
->phy_address
= mdio
->prtad
;
188 mdio
->mode_support
& (MDIO_SUPPORTS_C45
| MDIO_SUPPORTS_C22
);
190 reg
= mdio
->mdio_read(mdio
->dev
, mdio
->prtad
, MDIO_MMD_PMAPMD
,
192 switch (reg
& MDIO_PMA_CTRL2_TYPE
) {
193 case MDIO_PMA_CTRL2_10GBT
:
194 case MDIO_PMA_CTRL2_1000BT
:
195 case MDIO_PMA_CTRL2_100BTX
:
196 case MDIO_PMA_CTRL2_10BT
:
197 ecmd
->port
= PORT_TP
;
198 ecmd
->supported
= SUPPORTED_TP
;
199 reg
= mdio
->mdio_read(mdio
->dev
, mdio
->prtad
, MDIO_MMD_PMAPMD
,
201 if (reg
& MDIO_SPEED_10G
)
202 ecmd
->supported
|= SUPPORTED_10000baseT_Full
;
203 if (reg
& MDIO_PMA_SPEED_1000
)
204 ecmd
->supported
|= (SUPPORTED_1000baseT_Full
|
205 SUPPORTED_1000baseT_Half
);
206 if (reg
& MDIO_PMA_SPEED_100
)
207 ecmd
->supported
|= (SUPPORTED_100baseT_Full
|
208 SUPPORTED_100baseT_Half
);
209 if (reg
& MDIO_PMA_SPEED_10
)
210 ecmd
->supported
|= (SUPPORTED_10baseT_Full
|
211 SUPPORTED_10baseT_Half
);
212 ecmd
->advertising
= ADVERTISED_TP
;
215 case MDIO_PMA_CTRL2_10GBCX4
:
216 ecmd
->port
= PORT_OTHER
;
218 ecmd
->advertising
= 0;
221 case MDIO_PMA_CTRL2_10GBKX4
:
222 case MDIO_PMA_CTRL2_10GBKR
:
223 case MDIO_PMA_CTRL2_1000BKX
:
224 ecmd
->port
= PORT_OTHER
;
225 ecmd
->supported
= SUPPORTED_Backplane
;
226 reg
= mdio
->mdio_read(mdio
->dev
, mdio
->prtad
, MDIO_MMD_PMAPMD
,
228 if (reg
& MDIO_PMA_EXTABLE_10GBKX4
)
229 ecmd
->supported
|= SUPPORTED_10000baseKX4_Full
;
230 if (reg
& MDIO_PMA_EXTABLE_10GBKR
)
231 ecmd
->supported
|= SUPPORTED_10000baseKR_Full
;
232 if (reg
& MDIO_PMA_EXTABLE_1000BKX
)
233 ecmd
->supported
|= SUPPORTED_1000baseKX_Full
;
234 reg
= mdio
->mdio_read(mdio
->dev
, mdio
->prtad
, MDIO_MMD_PMAPMD
,
235 MDIO_PMA_10GBR_FECABLE
);
236 if (reg
& MDIO_PMA_10GBR_FECABLE_ABLE
)
237 ecmd
->supported
|= SUPPORTED_10000baseR_FEC
;
238 ecmd
->advertising
= ADVERTISED_Backplane
;
241 /* All the other defined modes are flavours of optical */
243 ecmd
->port
= PORT_FIBRE
;
244 ecmd
->supported
= SUPPORTED_FIBRE
;
245 ecmd
->advertising
= ADVERTISED_FIBRE
;
249 if (mdio
->mmds
& MDIO_DEVS_AN
) {
250 ecmd
->supported
|= SUPPORTED_Autoneg
;
251 reg
= mdio
->mdio_read(mdio
->dev
, mdio
->prtad
, MDIO_MMD_AN
,
253 if (reg
& MDIO_AN_CTRL1_ENABLE
) {
254 ecmd
->autoneg
= AUTONEG_ENABLE
;
257 mdio45_get_an(mdio
, MDIO_AN_ADVERTISE
) |
260 ecmd
->autoneg
= AUTONEG_DISABLE
;
263 ecmd
->autoneg
= AUTONEG_DISABLE
;
268 int an_stat
= mdio
->mdio_read(mdio
->dev
, mdio
->prtad
,
269 MDIO_MMD_AN
, MDIO_STAT1
);
271 /* If AN is complete and successful, report best common
272 * mode, otherwise report best advertised mode. */
273 if (an_stat
& MDIO_AN_STAT1_COMPLETE
) {
274 ecmd
->lp_advertising
=
275 mdio45_get_an(mdio
, MDIO_AN_LPA
) | npage_lpa
;
276 if (an_stat
& MDIO_AN_STAT1_LPABLE
)
277 ecmd
->lp_advertising
|= ADVERTISED_Autoneg
;
278 modes
= ecmd
->advertising
& ecmd
->lp_advertising
;
280 if ((modes
& ~ADVERTISED_Autoneg
) == 0)
281 modes
= ecmd
->advertising
;
283 if (modes
& (ADVERTISED_10000baseT_Full
|
284 ADVERTISED_10000baseKX4_Full
|
285 ADVERTISED_10000baseKR_Full
)) {
286 ecmd
->speed
= SPEED_10000
;
287 ecmd
->duplex
= DUPLEX_FULL
;
288 } else if (modes
& (ADVERTISED_1000baseT_Full
|
289 ADVERTISED_1000baseT_Half
|
290 ADVERTISED_1000baseKX_Full
)) {
291 ecmd
->speed
= SPEED_1000
;
292 ecmd
->duplex
= !(modes
& ADVERTISED_1000baseT_Half
);
293 } else if (modes
& (ADVERTISED_100baseT_Full
|
294 ADVERTISED_100baseT_Half
)) {
295 ecmd
->speed
= SPEED_100
;
296 ecmd
->duplex
= !!(modes
& ADVERTISED_100baseT_Full
);
298 ecmd
->speed
= SPEED_10
;
299 ecmd
->duplex
= !!(modes
& ADVERTISED_10baseT_Full
);
302 /* Report forced settings */
303 reg
= mdio
->mdio_read(mdio
->dev
, mdio
->prtad
, MDIO_MMD_PMAPMD
,
305 ecmd
->speed
= (((reg
& MDIO_PMA_CTRL1_SPEED1000
) ? 100 : 1) *
306 ((reg
& MDIO_PMA_CTRL1_SPEED100
) ? 100 : 10));
307 ecmd
->duplex
= (reg
& MDIO_CTRL1_FULLDPLX
||
308 ecmd
->speed
== SPEED_10000
);
311 /* 10GBASE-T MDI/MDI-X */
312 if (ecmd
->port
== PORT_TP
&& ecmd
->speed
== SPEED_10000
) {
313 switch (mdio
->mdio_read(mdio
->dev
, mdio
->prtad
, MDIO_MMD_PMAPMD
,
314 MDIO_PMA_10GBT_SWAPPOL
)) {
315 case MDIO_PMA_10GBT_SWAPPOL_ABNX
| MDIO_PMA_10GBT_SWAPPOL_CDNX
:
316 ecmd
->eth_tp_mdix
= ETH_TP_MDI
;
319 ecmd
->eth_tp_mdix
= ETH_TP_MDI_X
;
322 /* It's complicated... */
323 ecmd
->eth_tp_mdix
= ETH_TP_MDI_INVALID
;
328 EXPORT_SYMBOL(mdio45_ethtool_gset_npage
);
331 * mdio45_ethtool_spauseparam_an - set auto-negotiated pause parameters
332 * @mdio: MDIO interface
333 * @ecmd: Ethtool request structure
335 * This function assumes that the PHY has an auto-negotiation MMD. It
336 * will enable and disable advertising of flow control as appropriate.
338 void mdio45_ethtool_spauseparam_an(const struct mdio_if_info
*mdio
,
339 const struct ethtool_pauseparam
*ecmd
)
343 WARN_ON(!(mdio
->mmds
& MDIO_DEVS_AN
));
345 old_adv
= mdio
->mdio_read(mdio
->dev
, mdio
->prtad
, MDIO_MMD_AN
,
347 adv
= old_adv
& ~(ADVERTISE_PAUSE_CAP
| ADVERTISE_PAUSE_ASYM
);
349 adv
|= mii_advertise_flowctrl(
350 (ecmd
->rx_pause
? FLOW_CTRL_RX
: 0) |
351 (ecmd
->tx_pause
? FLOW_CTRL_TX
: 0));
352 if (adv
!= old_adv
) {
353 mdio
->mdio_write(mdio
->dev
, mdio
->prtad
, MDIO_MMD_AN
,
354 MDIO_AN_ADVERTISE
, adv
);
355 mdio45_nway_restart(mdio
);
358 EXPORT_SYMBOL(mdio45_ethtool_spauseparam_an
);
361 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
362 * @mdio: MDIO interface
363 * @mii_data: MII ioctl data structure
364 * @cmd: MII ioctl command
366 * Returns 0 on success, negative on error.
368 int mdio_mii_ioctl(const struct mdio_if_info
*mdio
,
369 struct mii_ioctl_data
*mii_data
, int cmd
)
372 u16 addr
= mii_data
->reg_num
;
374 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */
377 if (mdio
->prtad
== MDIO_PRTAD_NONE
)
379 mii_data
->phy_id
= mdio
->prtad
;
385 if (!capable(CAP_NET_ADMIN
))
392 /* Validate/convert phy_id */
393 if ((mdio
->mode_support
& MDIO_SUPPORTS_C45
) &&
394 mdio_phy_id_is_c45(mii_data
->phy_id
)) {
395 prtad
= mdio_phy_id_prtad(mii_data
->phy_id
);
396 devad
= mdio_phy_id_devad(mii_data
->phy_id
);
397 } else if ((mdio
->mode_support
& MDIO_SUPPORTS_C22
) &&
398 mii_data
->phy_id
< 0x20) {
399 prtad
= mii_data
->phy_id
;
400 devad
= MDIO_DEVAD_NONE
;
402 } else if ((mdio
->mode_support
& MDIO_EMULATE_C22
) &&
403 mdio
->prtad
!= MDIO_PRTAD_NONE
&&
404 mii_data
->phy_id
== mdio
->prtad
) {
405 /* Remap commonly-used MII registers. */
412 devad
= __ffs(mdio
->mmds
);
416 if (!(mdio
->mmds
& MDIO_DEVS_AN
))
419 if (addr
== MII_ADVERTISE
)
420 addr
= MDIO_AN_ADVERTISE
;
431 if (cmd
== SIOCGMIIREG
) {
432 int rc
= mdio
->mdio_read(mdio
->dev
, prtad
, devad
, addr
);
435 mii_data
->val_out
= rc
;
438 return mdio
->mdio_write(mdio
->dev
, prtad
, devad
, addr
,
442 EXPORT_SYMBOL(mdio_mii_ioctl
);