mdio_10g.c

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/****************************************************************************
 * Driver for Solarflare Solarstorm network controllers and boards
 * Copyright 2006-2011 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 status;

    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) {
            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 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) {
                    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 efx_mdio_check_mmds(struct efx_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 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
    devs2 = efx_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) && efx_mdio_check_mmd(efx, mmd))
            return -EIO;
        mmd_mask = mmd_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 (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
        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_PHYXS_WS);
}

static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
                    int lpower, int mmd)
{
    int stat = efx_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) {
        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++;
    }
}

int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
{
    struct ethtool_cmd prev = { .cmd = ETHTOOL_GSET };

    efx->phy_op->get_settings(efx, &prev);

    if (ecmd->advertising == prev.advertising &&
        ethtool_cmd_speed(ecmd) == ethtool_cmd_speed(&prev) &&
        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;
}

void efx_mdio_an_reconfigure(struct efx_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;
    efx_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 = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
    reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
    efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
}

u8 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));
}

int efx_mdio_test_alive(struct efx_nic *efx)
{
    int rc;
    int devad = __ffs(efx->mdio.mmds);
    u16 physid1, physid2;

    mutex_lock(&efx->mac_lock);

    physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
    physid2 = efx_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 = efx_mdio_check_mmds(efx, efx->mdio.mmds);
    }

    mutex_unlock(&efx->mac_lock);
    return rc;
}