/****************************************************************************
* 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 "boards.h"
int mdio_clause45_reset_mmd(struct efx_nic *port, int mmd,
int spins, int spintime)
{
u32 ctrl;
int phy_id = port->mii.phy_id;
/* Catch callers passing values in the wrong units (or just silly) */
EFX_BUG_ON_PARANOID(spins * spintime >= 5000);
mdio_clause45_write(port, phy_id, mmd, MDIO_MMDREG_CTRL1,
(1 << MDIO_MMDREG_CTRL1_RESET_LBN));
/* Wait for the reset bit to clear. */
do {
msleep(spintime);
ctrl = mdio_clause45_read(port, phy_id, mmd, MDIO_MMDREG_CTRL1);
spins--;
} while (spins && (ctrl & (1 << MDIO_MMDREG_CTRL1_RESET_LBN)));
return spins ? spins : -ETIMEDOUT;
}
static int mdio_clause45_check_mmd(struct efx_nic *efx, int mmd,
int fault_fatal)
{
int status;
int phy_id = efx->mii.phy_id;
/* Read MMD STATUS2 to check it is responding. */
status = mdio_clause45_read(efx, phy_id, mmd, MDIO_MMDREG_STAT2);
if (((status >> MDIO_MMDREG_STAT2_PRESENT_LBN) &
((1 << MDIO_MMDREG_STAT2_PRESENT_WIDTH) - 1)) !=
MDIO_MMDREG_STAT2_PRESENT_VAL) {
EFX_ERR(efx, "PHY MMD %d not responding.\n", mmd);
return -EIO;
}
/* Read MMD STATUS 1 to check for fault. */
status = mdio_clause45_read(efx, phy_id, mmd, MDIO_MMDREG_STAT1);
if ((status & (1 << MDIO_MMDREG_STAT1_FAULT_LBN)) != 0) {
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 mdio_clause45_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 = mdio_clause45_read(efx,
efx->mii.phy_id,
mmd,
MDIO_MMDREG_CTRL1);
if (stat < 0) {
EFX_ERR(efx, "failed to read status of"
" MMD %d\n", mmd);
return -EIO;
}
if (stat & (1 << MDIO_MMDREG_CTRL1_RESET_LBN))
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 mdio_clause45_check_mmds(struct efx_nic *efx,
unsigned int mmd_mask, unsigned int fatal_mask)
{
int devices, mmd = 0;
int probe_mmd;
/* 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_MMDREG_DEVS0_PHYXS) ? MDIO_MMD_PHYXS :
__ffs(mmd_mask);
devices = mdio_clause45_read(efx, efx->mii.phy_id,
probe_mmd, MDIO_MMDREG_DEVS0);
/* Check all the expected MMDs are present */
if (devices < 0) {
EFX_ERR(efx, "failed to read devices present\n");
return -EIO;
}
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 (mdio_clause45_check_mmd(efx, mmd, fault_fatal))
return -EIO;
}
mmd_mask = mmd_mask >> 1;
fatal_mask = fatal_mask >> 1;
mmd++;
}
return 0;
}
int mdio_clause45_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
{
int phy_id = efx->mii.phy_id;
int status;
int ok = 1;
int mmd = 0;
int good;
while (mmd_mask) {
if (mmd_mask & 1) {
/* Double reads because link state is latched, and a
* read moves the current state into the register */
status = mdio_clause45_read(efx, phy_id,
mmd, MDIO_MMDREG_STAT1);
status = mdio_clause45_read(efx, phy_id,
mmd, MDIO_MMDREG_STAT1);
good = status & (1 << MDIO_MMDREG_STAT1_LINK_LBN);
ok = ok && good;
}
mmd_mask = (mmd_mask >> 1);
mmd++;
}
return ok;
}
/**
* mdio_clause45_get_settings - Read (some of) the PHY settings over MDIO.
* @efx: Efx NIC
* @ecmd: Buffer for settings
*
* On return the 'port', 'speed', 'supported' and 'advertising' fields of
* ecmd have been filled out based on the PMA type.
*/
void mdio_clause45_get_settings(struct efx_nic *efx,
struct ethtool_cmd *ecmd)
{
int pma_type;
/* If no PMA is present we are presumably talking something XAUI-ish
* like CX4. Which we report as FIBRE (see below) */
if ((efx->phy_op->mmds & DEV_PRESENT_BIT(MDIO_MMD_PMAPMD)) == 0) {
ecmd->speed = SPEED_10000;
ecmd->port = PORT_FIBRE;
ecmd->supported = SUPPORTED_FIBRE;
ecmd->advertising = ADVERTISED_FIBRE;
return;
}
pma_type = mdio_clause45_read(efx, efx->mii.phy_id,
MDIO_MMD_PMAPMD, MDIO_MMDREG_CTRL2);
pma_type &= MDIO_PMAPMD_CTRL2_TYPE_MASK;
switch (pma_type) {
/* We represent CX4 as fibre in the absence of anything
better. */
case MDIO_PMAPMD_CTRL2_10G_CX4:
ecmd->speed = SPEED_10000;
ecmd->port = PORT_FIBRE;
ecmd->supported = SUPPORTED_FIBRE;
ecmd->advertising = ADVERTISED_FIBRE;
break;
/* 10G Base-T */
case MDIO_PMAPMD_CTRL2_10G_BT:
ecmd->speed = SPEED_10000;
ecmd->port = PORT_TP;
ecmd->supported = SUPPORTED_TP | SUPPORTED_10000baseT_Full;
ecmd->advertising = (ADVERTISED_FIBRE
| ADVERTISED_10000baseT_Full);
break;
case MDIO_PMAPMD_CTRL2_1G_BT:
ecmd->speed = SPEED_1000;
ecmd->port = PORT_TP;
ecmd->supported = SUPPORTED_TP | SUPPORTED_1000baseT_Full;
ecmd->advertising = (ADVERTISED_FIBRE
| ADVERTISED_1000baseT_Full);
break;
case MDIO_PMAPMD_CTRL2_100_BT:
ecmd->speed = SPEED_100;
ecmd->port = PORT_TP;
ecmd->supported = SUPPORTED_TP | SUPPORTED_100baseT_Full;
ecmd->advertising = (ADVERTISED_FIBRE
| ADVERTISED_100baseT_Full);
break;
case MDIO_PMAPMD_CTRL2_10_BT:
ecmd->speed = SPEED_10;
ecmd->port = PORT_TP;
ecmd->supported = SUPPORTED_TP | SUPPORTED_10baseT_Full;
ecmd->advertising = ADVERTISED_FIBRE | ADVERTISED_10baseT_Full;
break;
/* All the other defined modes are flavours of
* 10G optical */
default:
ecmd->speed = SPEED_10000;
ecmd->port = PORT_FIBRE;
ecmd->supported = SUPPORTED_FIBRE;
ecmd->advertising = ADVERTISED_FIBRE;
break;
}
}
/**
* mdio_clause45_set_settings - Set (some of) the PHY settings over MDIO.
* @efx: Efx NIC
* @ecmd: New settings
*
* Currently this just enforces that we are _not_ changing the
* 'port', 'speed', 'supported' or 'advertising' settings as these
* cannot be changed on any currently supported PHY.
*/
int mdio_clause45_set_settings(struct efx_nic *efx,
struct ethtool_cmd *ecmd)
{
struct ethtool_cmd tmpcmd;
mdio_clause45_get_settings(efx, &tmpcmd);
/* None of the current PHYs support more than one mode
* of operation (and only 10GBT ever will), so keep things
* simple for now */
if ((ecmd->speed == tmpcmd.speed) && (ecmd->port == tmpcmd.port) &&
(ecmd->supported == tmpcmd.supported) &&
(ecmd->advertising == tmpcmd.advertising))
return 0;
return -EOPNOTSUPP;
}
