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linux/drivers/net/sfc/mdio_10g.c
Ben Hutchings d3245b28ef sfc: Refactor link configuration 
Refactor PHY, MAC and NIC configuration operations so that the
existing link configuration can be re-pushed with:

	efx->phy_op->reconfigure(efx);
	efx->mac_op->reconfigure(efx);

and a new configuration with:

	efx->nic_op->reconfigure_port(efx);

(plus locking and error-checking).

We have not held the link settings in software (aside from flow
control), and have relied on asking the hardware what they are.  This
is a problem because in some cases the hardware may no longer be in a
state to tell us.  In particular, if an entire multi-port board is
reset through one port, the driver bindings to other ports have no
chance to save settings before recovering.

We only actually need to keep track of the autonegotiation settings,
so add an ethtool advertising mask to struct efx_nic, initialise it
in PHY init and update it as necessary.

Remove now-unneeded uses of efx_phy_op::{get,set}_settings() and
struct ethtool_cmd.

Much of this was done by Steve Hodgson <shodgson@solarflare.com>.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-11-29 16:46:28 -08:00

338 lines
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/****************************************************************************
* Driver for Solarflare Solarstorm network controllers and boards
* Copyright 2006-2008 Solarflare Communications Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
/*
* Useful functions for working with MDIO clause 45 PHYs
*/
#include <linux/types.h>
#include <linux/ethtool.h>
#include <linux/delay.h>
#include "net_driver.h"
#include "mdio_10g.h"
#include "workarounds.h"
unsigned efx_mdio_id_oui(u32 id)
{
unsigned oui = 0;
int i;
/* The bits of the OUI are designated a..x, with a=0 and b variable.
* In the id register c is the MSB but the OUI is conventionally
* written as bytes h..a, p..i, x..q. Reorder the bits accordingly. */
for (i = 0; i < 22; ++i)
if (id & (1 << (i + 10)))
oui |= 1 << (i ^ 7);
return oui;
}
int efx_mdio_reset_mmd(struct efx_nic *port, int mmd,
int spins, int spintime)
{
u32 ctrl;
/* Catch callers passing values in the wrong units (or just silly) */
EFX_BUG_ON_PARANOID(spins * spintime >= 5000);
efx_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
/* Wait for the reset bit to clear. */
do {
msleep(spintime);
ctrl = efx_mdio_read(port, mmd, MDIO_CTRL1);
spins--;
} while (spins && (ctrl & MDIO_CTRL1_RESET));
return spins ? spins : -ETIMEDOUT;
}
static int efx_mdio_check_mmd(struct efx_nic *efx, int mmd, int fault_fatal)
{
int status;
if (LOOPBACK_INTERNAL(efx))
return 0;
if (mmd != MDIO_MMD_AN) {
/* Read MMD STATUS2 to check it is responding. */
status = efx_mdio_read(efx, mmd, MDIO_STAT2);
if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
EFX_ERR(efx, "PHY MMD %d not responding.\n", mmd);
return -EIO;
}
}
/* Read MMD STATUS 1 to check for fault. */
status = efx_mdio_read(efx, mmd, MDIO_STAT1);
if (status & MDIO_STAT1_FAULT) {
if (fault_fatal) {
EFX_ERR(efx, "PHY MMD %d reporting fatal"
" fault: status %x\n", mmd, status);
return -EIO;
} else {
EFX_LOG(efx, "PHY MMD %d reporting status"
" %x (expected)\n", mmd, status);
}
}
return 0;
}
/* This ought to be ridiculous overkill. We expect it to fail rarely */
#define MDIO45_RESET_TIME 1000 /* ms */
#define MDIO45_RESET_ITERS 100
int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
{
const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
int tries = MDIO45_RESET_ITERS;
int rc = 0;
int in_reset;
while (tries) {
int mask = mmd_mask;
int mmd = 0;
int stat;
in_reset = 0;
while (mask) {
if (mask & 1) {
stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
if (stat < 0) {
EFX_ERR(efx, "failed to read status of"
" MMD %d\n", mmd);
return -EIO;
}
if (stat & MDIO_CTRL1_RESET)
in_reset |= (1 << mmd);
}
mask = mask >> 1;
mmd++;
}
if (!in_reset)
break;
tries--;
msleep(spintime);
}
if (in_reset != 0) {
EFX_ERR(efx, "not all MMDs came out of reset in time."
" MMDs still in reset: %x\n", in_reset);
rc = -ETIMEDOUT;
}
return rc;
}
int efx_mdio_check_mmds(struct efx_nic *efx,
unsigned int mmd_mask, unsigned int fatal_mask)
{
int mmd = 0, probe_mmd, devs1, devs2;
u32 devices;
/* Historically we have probed the PHYXS to find out what devices are
* present,but that doesn't work so well if the PHYXS isn't expected
* to exist, if so just find the first item in the list supplied. */
probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
__ffs(mmd_mask);
/* Check all the expected MMDs are present */
devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
if (devs1 < 0 || devs2 < 0) {
EFX_ERR(efx, "failed to read devices present\n");
return -EIO;
}
devices = devs1 | (devs2 << 16);
if ((devices & mmd_mask) != mmd_mask) {
EFX_ERR(efx, "required MMDs not present: got %x, "
"wanted %x\n", devices, mmd_mask);
return -ENODEV;
}
EFX_TRACE(efx, "Devices present: %x\n", devices);
/* Check all required MMDs are responding and happy. */
while (mmd_mask) {
if (mmd_mask & 1) {
int fault_fatal = fatal_mask & 1;
if (efx_mdio_check_mmd(efx, mmd, fault_fatal))
return -EIO;
}
mmd_mask = mmd_mask >> 1;
fatal_mask = fatal_mask >> 1;
mmd++;
}
return 0;
}
bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
{
/* If the port is in loopback, then we should only consider a subset
* of mmd's */
if (LOOPBACK_INTERNAL(efx))
return true;
else if (efx->loopback_mode == LOOPBACK_NETWORK)
return false;
else if (efx_phy_mode_disabled(efx->phy_mode))
return false;
else if (efx->loopback_mode == LOOPBACK_PHYXS)
mmd_mask &= ~(MDIO_DEVS_PHYXS |
MDIO_DEVS_PCS |
MDIO_DEVS_PMAPMD |
MDIO_DEVS_AN);
else if (efx->loopback_mode == LOOPBACK_PCS)
mmd_mask &= ~(MDIO_DEVS_PCS |
MDIO_DEVS_PMAPMD |
MDIO_DEVS_AN);
else if (efx->loopback_mode == LOOPBACK_PMAPMD)
mmd_mask &= ~(MDIO_DEVS_PMAPMD |
MDIO_DEVS_AN);
return mdio45_links_ok(&efx->mdio, mmd_mask);
}
void efx_mdio_transmit_disable(struct efx_nic *efx)
{
efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
efx->phy_mode & PHY_MODE_TX_DISABLED);
}
void efx_mdio_phy_reconfigure(struct efx_nic *efx)
{
efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
efx->loopback_mode == LOOPBACK_PMAPMD);
efx_mdio_set_flag(efx, MDIO_MMD_PCS,
MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
efx->loopback_mode == LOOPBACK_PCS);
efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
efx->loopback_mode == LOOPBACK_NETWORK);
}
static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
int lpower, int mmd)
{
int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
EFX_TRACE(efx, "Setting low power mode for MMD %d to %d\n",
mmd, lpower);
if (stat & MDIO_STAT1_LPOWERABLE) {
efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
MDIO_CTRL1_LPOWER, lpower);
}
}
void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
int low_power, unsigned int mmd_mask)
{
int mmd = 0;
mmd_mask &= ~MDIO_DEVS_AN;
while (mmd_mask) {
if (mmd_mask & 1)
efx_mdio_set_mmd_lpower(efx, low_power, mmd);
mmd_mask = (mmd_mask >> 1);
mmd++;
}
}
/**
* efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
* @efx: Efx NIC
* @ecmd: New settings
*/
int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
{
struct ethtool_cmd prev;
efx->phy_op->get_settings(efx, &prev);
if (ecmd->advertising == prev.advertising &&
ecmd->speed == prev.speed &&
ecmd->duplex == prev.duplex &&
ecmd->port == prev.port &&
ecmd->autoneg == prev.autoneg)
return 0;
/* We can only change these settings for -T PHYs */
if (prev.port != PORT_TP || ecmd->port != PORT_TP)
return -EINVAL;
/* Check that PHY supports these settings */
if (!ecmd->autoneg ||
(ecmd->advertising | SUPPORTED_Autoneg) & ~prev.supported)
return -EINVAL;
efx_link_set_advertising(efx, ecmd->advertising | ADVERTISED_Autoneg);
efx_mdio_an_reconfigure(efx);
return 0;
}
/**
* efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
* @efx: Efx NIC
*/
void efx_mdio_an_reconfigure(struct efx_nic *efx)
{
bool xnp = (efx->link_advertising & ADVERTISED_10000baseT_Full
|| EFX_WORKAROUND_13204(efx));
int reg;
WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
/* Set up the base page */
reg = ADVERTISE_CSMA;
if (efx->link_advertising & ADVERTISED_10baseT_Half)
reg |= ADVERTISE_10HALF;
if (efx->link_advertising & ADVERTISED_10baseT_Full)
reg |= ADVERTISE_10FULL;
if (efx->link_advertising & ADVERTISED_100baseT_Half)
reg |= ADVERTISE_100HALF;
if (efx->link_advertising & ADVERTISED_100baseT_Full)
reg |= ADVERTISE_100FULL;
if (xnp)
reg |= ADVERTISE_RESV;
else if (efx->link_advertising & (ADVERTISED_1000baseT_Half |
ADVERTISED_1000baseT_Full))
reg |= ADVERTISE_NPAGE;
if (efx->link_advertising & ADVERTISED_Pause)
reg |= ADVERTISE_PAUSE_CAP;
if (efx->link_advertising & ADVERTISED_Asym_Pause)
reg |= ADVERTISE_PAUSE_ASYM;
efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
/* Set up the (extended) next page if necessary */
if (efx->phy_op->set_npage_adv)
efx->phy_op->set_npage_adv(efx, efx->link_advertising);
/* Enable and restart AN */
reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
reg |= MDIO_AN_CTRL1_ENABLE;
if (!(EFX_WORKAROUND_15195(efx) &&
LOOPBACK_MASK(efx) & efx->phy_op->loopbacks))
reg |= MDIO_AN_CTRL1_RESTART;
if (xnp)
reg |= MDIO_AN_CTRL1_XNP;
else
reg &= ~MDIO_AN_CTRL1_XNP;
efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
}
enum efx_fc_type efx_mdio_get_pause(struct efx_nic *efx)
{
BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));
if (!(efx->wanted_fc & EFX_FC_AUTO))
return efx->wanted_fc;
WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
return mii_resolve_flowctrl_fdx(
mii_advertise_flowctrl(efx->wanted_fc),
efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
}
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