// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2006-2011 Solarflare Communications Inc.
*/
/*
* 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 ef4_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 ef4_mdio_reset_mmd(struct ef4_nic *port, int mmd,
int spins, int spintime)
{
u32 ctrl;
/* Catch callers passing values in the wrong units (or just silly) */
EF4_BUG_ON_PARANOID(spins * spintime >= 5000);
ef4_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
/* Wait for the reset bit to clear. */
do {
msleep(spintime);
ctrl = ef4_mdio_read(port, mmd, MDIO_CTRL1);
spins--;
} while (spins && (ctrl & MDIO_CTRL1_RESET));
return spins ? spins : -ETIMEDOUT;
}
static int ef4_mdio_check_mmd(struct ef4_nic *efx, int mmd)
{
int status;
if (mmd != MDIO_MMD_AN) {
/* Read MMD STATUS2 to check it is responding. */
status = ef4_mdio_read(efx, mmd, MDIO_STAT2);
if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
netif_err(efx, hw, efx->net_dev,
"PHY MMD %d not responding.\n", mmd);
return -EIO;
}
}
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 ef4_mdio_wait_reset_mmds(struct ef4_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 = ef4_mdio_read(efx, mmd, MDIO_CTRL1);
if (stat < 0) {
netif_err(efx, hw, efx->net_dev,
"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) {
netif_err(efx, hw, efx->net_dev,
"not all MMDs came out of reset in time."
" MMDs still in reset: %x\n", in_reset);
rc = -ETIMEDOUT;
}
return rc;
}
int ef4_mdio_check_mmds(struct ef4_nic *efx, unsigned int mmd_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 = ef4_mdio_read(efx, probe_mmd, MDIO_DEVS1);
devs2 = ef4_mdio_read(efx, probe_mmd, MDIO_DEVS2);
if (devs1 < 0 || devs2 < 0) {
netif_err(efx, hw, efx->net_dev,
"failed to read devices present\n");
return -EIO;
}
devices = devs1 | (devs2 << 16);
if ((devices & mmd_mask) != mmd_mask) {
netif_err(efx, hw, efx->net_dev,
"required MMDs not present: got %x, wanted %x\n",
devices, mmd_mask);
return -ENODEV;
}
netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
/* Check all required MMDs are responding and happy. */
while (mmd_mask) {
if ((mmd_mask & 1) && ef4_mdio_check_mmd(efx, mmd))
return -EIO;
mmd_mask = mmd_mask >> 1;
mmd++;
}
return 0;
}
bool ef4_mdio_links_ok(struct ef4_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 (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
return false;
else if (ef4_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 ef4_mdio_transmit_disable(struct ef4_nic *efx)
{
ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
efx->phy_mode & PHY_MODE_TX_DISABLED);
}
void ef4_mdio_phy_reconfigure(struct ef4_nic *efx)
{
ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
efx->loopback_mode == LOOPBACK_PMAPMD);
ef4_mdio_set_flag(efx, MDIO_MMD_PCS,
MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
efx->loopback_mode == LOOPBACK_PCS);
ef4_mdio_set_flag(efx, MDIO_MMD_PHYXS,
MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
efx->loopback_mode == LOOPBACK_PHYXS_WS);
}
static void ef4_mdio_set_mmd_lpower(struct ef4_nic *efx,
int lpower, int mmd)
{
int stat = ef4_mdio_read(efx, mmd, MDIO_STAT1);
netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
mmd, lpower);
if (stat & MDIO_STAT1_LPOWERABLE) {
ef4_mdio_set_flag(efx, mmd, MDIO_CTRL1,
MDIO_CTRL1_LPOWER, lpower);
}
}
void ef4_mdio_set_mmds_lpower(struct ef4_nic *efx,
int low_power, unsigned int mmd_mask)
{
int mmd = 0;
mmd_mask &= ~MDIO_DEVS_AN;
while (mmd_mask) {
if (mmd_mask & 1)
ef4_mdio_set_mmd_lpower(efx, low_power, mmd);
mmd_mask = (mmd_mask >> 1);
mmd++;
}
}
/**
* ef4_mdio_set_link_ksettings - Set (some of) the PHY settings over MDIO.
* @efx: Efx NIC
* @cmd: New settings
*/
int ef4_mdio_set_link_ksettings(struct ef4_nic *efx,
const struct ethtool_link_ksettings *cmd)
{
struct ethtool_link_ksettings prev = {
.base.cmd = ETHTOOL_GLINKSETTINGS
};
u32 prev_advertising, advertising;
u32 prev_supported;
efx->phy_op->get_link_ksettings(efx, &prev);
ethtool_convert_link_mode_to_legacy_u32(&advertising,
cmd->link_modes.advertising);
ethtool_convert_link_mode_to_legacy_u32(&prev_advertising,
prev.link_modes.advertising);
ethtool_convert_link_mode_to_legacy_u32(&prev_supported,
prev.link_modes.supported);
if (advertising == prev_advertising &&
cmd->base.speed == prev.base.speed &&
cmd->base.duplex == prev.base.duplex &&
cmd->base.port == prev.base.port &&
cmd->base.autoneg == prev.base.autoneg)
return 0;
/* We can only change these settings for -T PHYs */
if (prev.base.port != PORT_TP || cmd->base.port != PORT_TP)
return -EINVAL;
/* Check that PHY supports these settings */
if (!cmd->base.autoneg ||
(advertising | SUPPORTED_Autoneg) & ~prev_supported)
return -EINVAL;
ef4_link_set_advertising(efx, advertising | ADVERTISED_Autoneg);
ef4_mdio_an_reconfigure(efx);
return 0;
}
/**
* ef4_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
* @efx: Efx NIC
*/
void ef4_mdio_an_reconfigure(struct ef4_nic *efx)
{
int reg;
WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
/* Set up the base page */
reg = ADVERTISE_CSMA | ADVERTISE_RESV;
if (efx->link_advertising & ADVERTISED_Pause)
reg |= ADVERTISE_PAUSE_CAP;
if (efx->link_advertising & ADVERTISED_Asym_Pause)
reg |= ADVERTISE_PAUSE_ASYM;
ef4_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
/* Set up the (extended) next page */
efx->phy_op->set_npage_adv(efx, efx->link_advertising);
/* Enable and restart AN */
reg = ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
ef4_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
}
u8 ef4_mdio_get_pause(struct ef4_nic *efx)
{
BUILD_BUG_ON(EF4_FC_AUTO & (EF4_FC_RX | EF4_FC_TX));
if (!(efx->wanted_fc & EF4_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),
ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
}
int ef4_mdio_test_alive(struct ef4_nic *efx)
{
int rc;
int devad = __ffs(efx->mdio.mmds);
u16 physid1, physid2;
mutex_lock(&efx->mac_lock);
physid1 = ef4_mdio_read(efx, devad, MDIO_DEVID1);
physid2 = ef4_mdio_read(efx, devad, MDIO_DEVID2);
if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
(physid2 == 0x0000) || (physid2 == 0xffff)) {
netif_err(efx, hw, efx->net_dev,
"no MDIO PHY present with ID %d\n", efx->mdio.prtad);
rc = -EINVAL;
} else {
rc = ef4_mdio_check_mmds(efx, efx->mdio.mmds);
}
mutex_unlock(&efx->mac_lock);
return rc;
}
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