1 /****************************************************************************
2 * Driver for Solarflare Solarstorm network controllers and boards
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 * Useful functions for working with MDIO clause 45 PHYs
12 #include <linux/types.h>
13 #include <linux/ethtool.h>
14 #include <linux/delay.h>
15 #include "net_driver.h"
17 #include "workarounds.h"
19 unsigned efx_mdio_id_oui(u32 id
)
24 /* The bits of the OUI are designated a..x, with a=0 and b variable.
25 * In the id register c is the MSB but the OUI is conventionally
26 * written as bytes h..a, p..i, x..q. Reorder the bits accordingly. */
27 for (i
= 0; i
< 22; ++i
)
28 if (id
& (1 << (i
+ 10)))
34 int efx_mdio_reset_mmd(struct efx_nic
*port
, int mmd
,
35 int spins
, int spintime
)
39 /* Catch callers passing values in the wrong units (or just silly) */
40 EFX_BUG_ON_PARANOID(spins
* spintime
>= 5000);
42 efx_mdio_write(port
, mmd
, MDIO_CTRL1
, MDIO_CTRL1_RESET
);
43 /* Wait for the reset bit to clear. */
46 ctrl
= efx_mdio_read(port
, mmd
, MDIO_CTRL1
);
49 } while (spins
&& (ctrl
& MDIO_CTRL1_RESET
));
51 return spins
? spins
: -ETIMEDOUT
;
54 static int efx_mdio_check_mmd(struct efx_nic
*efx
, int mmd
, int fault_fatal
)
58 if (LOOPBACK_INTERNAL(efx
))
61 if (mmd
!= MDIO_MMD_AN
) {
62 /* Read MMD STATUS2 to check it is responding. */
63 status
= efx_mdio_read(efx
, mmd
, MDIO_STAT2
);
64 if ((status
& MDIO_STAT2_DEVPRST
) != MDIO_STAT2_DEVPRST_VAL
) {
65 netif_err(efx
, hw
, efx
->net_dev
,
66 "PHY MMD %d not responding.\n", mmd
);
71 /* Read MMD STATUS 1 to check for fault. */
72 status
= efx_mdio_read(efx
, mmd
, MDIO_STAT1
);
73 if (status
& MDIO_STAT1_FAULT
) {
75 netif_err(efx
, hw
, efx
->net_dev
,
76 "PHY MMD %d reporting fatal"
77 " fault: status %x\n", mmd
, status
);
80 netif_dbg(efx
, hw
, efx
->net_dev
,
81 "PHY MMD %d reporting status"
82 " %x (expected)\n", mmd
, status
);
88 /* This ought to be ridiculous overkill. We expect it to fail rarely */
89 #define MDIO45_RESET_TIME 1000 /* ms */
90 #define MDIO45_RESET_ITERS 100
92 int efx_mdio_wait_reset_mmds(struct efx_nic
*efx
, unsigned int mmd_mask
)
94 const int spintime
= MDIO45_RESET_TIME
/ MDIO45_RESET_ITERS
;
95 int tries
= MDIO45_RESET_ITERS
;
106 stat
= efx_mdio_read(efx
, mmd
, MDIO_CTRL1
);
108 netif_err(efx
, hw
, efx
->net_dev
,
109 "failed to read status of"
113 if (stat
& MDIO_CTRL1_RESET
)
114 in_reset
|= (1 << mmd
);
125 netif_err(efx
, hw
, efx
->net_dev
,
126 "not all MMDs came out of reset in time."
127 " MMDs still in reset: %x\n", in_reset
);
133 int efx_mdio_check_mmds(struct efx_nic
*efx
,
134 unsigned int mmd_mask
, unsigned int fatal_mask
)
136 int mmd
= 0, probe_mmd
, devs1
, devs2
;
139 /* Historically we have probed the PHYXS to find out what devices are
140 * present,but that doesn't work so well if the PHYXS isn't expected
141 * to exist, if so just find the first item in the list supplied. */
142 probe_mmd
= (mmd_mask
& MDIO_DEVS_PHYXS
) ? MDIO_MMD_PHYXS
:
145 /* Check all the expected MMDs are present */
146 devs1
= efx_mdio_read(efx
, probe_mmd
, MDIO_DEVS1
);
147 devs2
= efx_mdio_read(efx
, probe_mmd
, MDIO_DEVS2
);
148 if (devs1
< 0 || devs2
< 0) {
149 netif_err(efx
, hw
, efx
->net_dev
,
150 "failed to read devices present\n");
153 devices
= devs1
| (devs2
<< 16);
154 if ((devices
& mmd_mask
) != mmd_mask
) {
155 netif_err(efx
, hw
, efx
->net_dev
,
156 "required MMDs not present: got %x, wanted %x\n",
160 netif_vdbg(efx
, hw
, efx
->net_dev
, "Devices present: %x\n", devices
);
162 /* Check all required MMDs are responding and happy. */
165 int fault_fatal
= fatal_mask
& 1;
166 if (efx_mdio_check_mmd(efx
, mmd
, fault_fatal
))
169 mmd_mask
= mmd_mask
>> 1;
170 fatal_mask
= fatal_mask
>> 1;
177 bool efx_mdio_links_ok(struct efx_nic
*efx
, unsigned int mmd_mask
)
179 /* If the port is in loopback, then we should only consider a subset
181 if (LOOPBACK_INTERNAL(efx
))
183 else if (LOOPBACK_MASK(efx
) & LOOPBACKS_WS
)
185 else if (efx_phy_mode_disabled(efx
->phy_mode
))
187 else if (efx
->loopback_mode
== LOOPBACK_PHYXS
)
188 mmd_mask
&= ~(MDIO_DEVS_PHYXS
|
192 else if (efx
->loopback_mode
== LOOPBACK_PCS
)
193 mmd_mask
&= ~(MDIO_DEVS_PCS
|
196 else if (efx
->loopback_mode
== LOOPBACK_PMAPMD
)
197 mmd_mask
&= ~(MDIO_DEVS_PMAPMD
|
200 return mdio45_links_ok(&efx
->mdio
, mmd_mask
);
203 void efx_mdio_transmit_disable(struct efx_nic
*efx
)
205 efx_mdio_set_flag(efx
, MDIO_MMD_PMAPMD
,
206 MDIO_PMA_TXDIS
, MDIO_PMD_TXDIS_GLOBAL
,
207 efx
->phy_mode
& PHY_MODE_TX_DISABLED
);
210 void efx_mdio_phy_reconfigure(struct efx_nic
*efx
)
212 efx_mdio_set_flag(efx
, MDIO_MMD_PMAPMD
,
213 MDIO_CTRL1
, MDIO_PMA_CTRL1_LOOPBACK
,
214 efx
->loopback_mode
== LOOPBACK_PMAPMD
);
215 efx_mdio_set_flag(efx
, MDIO_MMD_PCS
,
216 MDIO_CTRL1
, MDIO_PCS_CTRL1_LOOPBACK
,
217 efx
->loopback_mode
== LOOPBACK_PCS
);
218 efx_mdio_set_flag(efx
, MDIO_MMD_PHYXS
,
219 MDIO_CTRL1
, MDIO_PHYXS_CTRL1_LOOPBACK
,
220 efx
->loopback_mode
== LOOPBACK_PHYXS_WS
);
223 static void efx_mdio_set_mmd_lpower(struct efx_nic
*efx
,
226 int stat
= efx_mdio_read(efx
, mmd
, MDIO_STAT1
);
228 netif_vdbg(efx
, drv
, efx
->net_dev
, "Setting low power mode for MMD %d to %d\n",
231 if (stat
& MDIO_STAT1_LPOWERABLE
) {
232 efx_mdio_set_flag(efx
, mmd
, MDIO_CTRL1
,
233 MDIO_CTRL1_LPOWER
, lpower
);
237 void efx_mdio_set_mmds_lpower(struct efx_nic
*efx
,
238 int low_power
, unsigned int mmd_mask
)
241 mmd_mask
&= ~MDIO_DEVS_AN
;
244 efx_mdio_set_mmd_lpower(efx
, low_power
, mmd
);
245 mmd_mask
= (mmd_mask
>> 1);
251 * efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
253 * @ecmd: New settings
255 int efx_mdio_set_settings(struct efx_nic
*efx
, struct ethtool_cmd
*ecmd
)
257 struct ethtool_cmd prev
;
259 efx
->phy_op
->get_settings(efx
, &prev
);
261 if (ecmd
->advertising
== prev
.advertising
&&
262 ecmd
->speed
== prev
.speed
&&
263 ecmd
->duplex
== prev
.duplex
&&
264 ecmd
->port
== prev
.port
&&
265 ecmd
->autoneg
== prev
.autoneg
)
268 /* We can only change these settings for -T PHYs */
269 if (prev
.port
!= PORT_TP
|| ecmd
->port
!= PORT_TP
)
272 /* Check that PHY supports these settings */
273 if (!ecmd
->autoneg
||
274 (ecmd
->advertising
| SUPPORTED_Autoneg
) & ~prev
.supported
)
277 efx_link_set_advertising(efx
, ecmd
->advertising
| ADVERTISED_Autoneg
);
278 efx_mdio_an_reconfigure(efx
);
283 * efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
286 void efx_mdio_an_reconfigure(struct efx_nic
*efx
)
290 WARN_ON(!(efx
->mdio
.mmds
& MDIO_DEVS_AN
));
292 /* Set up the base page */
293 reg
= ADVERTISE_CSMA
| ADVERTISE_RESV
;
294 if (efx
->link_advertising
& ADVERTISED_Pause
)
295 reg
|= ADVERTISE_PAUSE_CAP
;
296 if (efx
->link_advertising
& ADVERTISED_Asym_Pause
)
297 reg
|= ADVERTISE_PAUSE_ASYM
;
298 efx_mdio_write(efx
, MDIO_MMD_AN
, MDIO_AN_ADVERTISE
, reg
);
300 /* Set up the (extended) next page */
301 efx
->phy_op
->set_npage_adv(efx
, efx
->link_advertising
);
303 /* Enable and restart AN */
304 reg
= efx_mdio_read(efx
, MDIO_MMD_AN
, MDIO_CTRL1
);
305 reg
|= MDIO_AN_CTRL1_ENABLE
| MDIO_AN_CTRL1_RESTART
| MDIO_AN_CTRL1_XNP
;
306 efx_mdio_write(efx
, MDIO_MMD_AN
, MDIO_CTRL1
, reg
);
309 enum efx_fc_type
efx_mdio_get_pause(struct efx_nic
*efx
)
311 BUILD_BUG_ON(EFX_FC_AUTO
& (EFX_FC_RX
| EFX_FC_TX
));
313 if (!(efx
->wanted_fc
& EFX_FC_AUTO
))
314 return efx
->wanted_fc
;
316 WARN_ON(!(efx
->mdio
.mmds
& MDIO_DEVS_AN
));
318 return mii_resolve_flowctrl_fdx(
319 mii_advertise_flowctrl(efx
->wanted_fc
),
320 efx_mdio_read(efx
, MDIO_MMD_AN
, MDIO_AN_LPA
));
323 int efx_mdio_test_alive(struct efx_nic
*efx
)
326 int devad
= __ffs(efx
->mdio
.mmds
);
327 u16 physid1
, physid2
;
329 mutex_lock(&efx
->mac_lock
);
331 physid1
= efx_mdio_read(efx
, devad
, MDIO_DEVID1
);
332 physid2
= efx_mdio_read(efx
, devad
, MDIO_DEVID2
);
334 if ((physid1
== 0x0000) || (physid1
== 0xffff) ||
335 (physid2
== 0x0000) || (physid2
== 0xffff)) {
336 netif_err(efx
, hw
, efx
->net_dev
,
337 "no MDIO PHY present with ID %d\n", efx
->mdio
.prtad
);
340 rc
= efx_mdio_check_mmds(efx
, efx
->mdio
.mmds
, 0);
343 mutex_unlock(&efx
->mac_lock
);