1
/****************************************************************************
2
* Driver for Solarflare Solarstorm network controllers and boards
3
* Copyright 2006-2011 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)
58
if (mmd != MDIO_MMD_AN) {
59
/* Read MMD STATUS2 to check it is responding. */
60
status = efx_mdio_read(efx, mmd, MDIO_STAT2);
61
if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
62
netif_err(efx, hw, efx->net_dev,
63
"PHY MMD %d not responding.\n", mmd);
71
/* This ought to be ridiculous overkill. We expect it to fail rarely */
72
#define MDIO45_RESET_TIME 1000 /* ms */
73
#define MDIO45_RESET_ITERS 100
75
int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
77
const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
78
int tries = MDIO45_RESET_ITERS;
89
stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
91
netif_err(efx, hw, efx->net_dev,
92
"failed to read status of"
96
if (stat & MDIO_CTRL1_RESET)
97
in_reset |= (1 << mmd);
108
netif_err(efx, hw, efx->net_dev,
109
"not all MMDs came out of reset in time."
110
" MMDs still in reset: %x\n", in_reset);
116
int efx_mdio_check_mmds(struct efx_nic *efx, unsigned int mmd_mask)
118
int mmd = 0, probe_mmd, devs1, devs2;
121
/* Historically we have probed the PHYXS to find out what devices are
122
* present,but that doesn't work so well if the PHYXS isn't expected
123
* to exist, if so just find the first item in the list supplied. */
124
probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
127
/* Check all the expected MMDs are present */
128
devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
129
devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
130
if (devs1 < 0 || devs2 < 0) {
131
netif_err(efx, hw, efx->net_dev,
132
"failed to read devices present\n");
135
devices = devs1 | (devs2 << 16);
136
if ((devices & mmd_mask) != mmd_mask) {
137
netif_err(efx, hw, efx->net_dev,
138
"required MMDs not present: got %x, wanted %x\n",
142
netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
144
/* Check all required MMDs are responding and happy. */
146
if ((mmd_mask & 1) && efx_mdio_check_mmd(efx, mmd))
148
mmd_mask = mmd_mask >> 1;
155
bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
157
/* If the port is in loopback, then we should only consider a subset
159
if (LOOPBACK_INTERNAL(efx))
161
else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
163
else if (efx_phy_mode_disabled(efx->phy_mode))
165
else if (efx->loopback_mode == LOOPBACK_PHYXS)
166
mmd_mask &= ~(MDIO_DEVS_PHYXS |
170
else if (efx->loopback_mode == LOOPBACK_PCS)
171
mmd_mask &= ~(MDIO_DEVS_PCS |
174
else if (efx->loopback_mode == LOOPBACK_PMAPMD)
175
mmd_mask &= ~(MDIO_DEVS_PMAPMD |
178
return mdio45_links_ok(&efx->mdio, mmd_mask);
181
void efx_mdio_transmit_disable(struct efx_nic *efx)
183
efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
184
MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
185
efx->phy_mode & PHY_MODE_TX_DISABLED);
188
void efx_mdio_phy_reconfigure(struct efx_nic *efx)
190
efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
191
MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
192
efx->loopback_mode == LOOPBACK_PMAPMD);
193
efx_mdio_set_flag(efx, MDIO_MMD_PCS,
194
MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
195
efx->loopback_mode == LOOPBACK_PCS);
196
efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
197
MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
198
efx->loopback_mode == LOOPBACK_PHYXS_WS);
201
static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
204
int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
206
netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
209
if (stat & MDIO_STAT1_LPOWERABLE) {
210
efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
211
MDIO_CTRL1_LPOWER, lpower);
215
void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
216
int low_power, unsigned int mmd_mask)
219
mmd_mask &= ~MDIO_DEVS_AN;
222
efx_mdio_set_mmd_lpower(efx, low_power, mmd);
223
mmd_mask = (mmd_mask >> 1);
229
* efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
231
* @ecmd: New settings
233
int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
235
struct ethtool_cmd prev = { .cmd = ETHTOOL_GSET };
237
efx->phy_op->get_settings(efx, &prev);
239
if (ecmd->advertising == prev.advertising &&
240
ethtool_cmd_speed(ecmd) == ethtool_cmd_speed(&prev) &&
241
ecmd->duplex == prev.duplex &&
242
ecmd->port == prev.port &&
243
ecmd->autoneg == prev.autoneg)
246
/* We can only change these settings for -T PHYs */
247
if (prev.port != PORT_TP || ecmd->port != PORT_TP)
250
/* Check that PHY supports these settings */
251
if (!ecmd->autoneg ||
252
(ecmd->advertising | SUPPORTED_Autoneg) & ~prev.supported)
255
efx_link_set_advertising(efx, ecmd->advertising | ADVERTISED_Autoneg);
256
efx_mdio_an_reconfigure(efx);
261
* efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
264
void efx_mdio_an_reconfigure(struct efx_nic *efx)
268
WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
270
/* Set up the base page */
271
reg = ADVERTISE_CSMA | ADVERTISE_RESV;
272
if (efx->link_advertising & ADVERTISED_Pause)
273
reg |= ADVERTISE_PAUSE_CAP;
274
if (efx->link_advertising & ADVERTISED_Asym_Pause)
275
reg |= ADVERTISE_PAUSE_ASYM;
276
efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
278
/* Set up the (extended) next page */
279
efx->phy_op->set_npage_adv(efx, efx->link_advertising);
281
/* Enable and restart AN */
282
reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
283
reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
284
efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
287
u8 efx_mdio_get_pause(struct efx_nic *efx)
289
BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));
291
if (!(efx->wanted_fc & EFX_FC_AUTO))
292
return efx->wanted_fc;
294
WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
296
return mii_resolve_flowctrl_fdx(
297
mii_advertise_flowctrl(efx->wanted_fc),
298
efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
301
int efx_mdio_test_alive(struct efx_nic *efx)
304
int devad = __ffs(efx->mdio.mmds);
305
u16 physid1, physid2;
307
mutex_lock(&efx->mac_lock);
309
physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
310
physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
312
if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
313
(physid2 == 0x0000) || (physid2 == 0xffff)) {
314
netif_err(efx, hw, efx->net_dev,
315
"no MDIO PHY present with ID %d\n", efx->mdio.prtad);
318
rc = efx_mdio_check_mmds(efx, efx->mdio.mmds);
321
mutex_unlock(&efx->mac_lock);