333 lines
8.7 KiB
C
333 lines
8.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/****************************************************************************
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* Driver for Solarflare network controllers and boards
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* Copyright 2006-2011 Solarflare Communications Inc.
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*/
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/*
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* Useful functions for working with MDIO clause 45 PHYs
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*/
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#include <linux/types.h>
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#include <linux/ethtool.h>
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#include <linux/delay.h>
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#include "net_driver.h"
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#include "mdio_10g.h"
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#include "workarounds.h"
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unsigned ef4_mdio_id_oui(u32 id)
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{
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unsigned oui = 0;
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int i;
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/* The bits of the OUI are designated a..x, with a=0 and b variable.
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* In the id register c is the MSB but the OUI is conventionally
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* written as bytes h..a, p..i, x..q. Reorder the bits accordingly. */
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for (i = 0; i < 22; ++i)
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if (id & (1 << (i + 10)))
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oui |= 1 << (i ^ 7);
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return oui;
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}
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int ef4_mdio_reset_mmd(struct ef4_nic *port, int mmd,
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int spins, int spintime)
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{
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u32 ctrl;
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/* Catch callers passing values in the wrong units (or just silly) */
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EF4_BUG_ON_PARANOID(spins * spintime >= 5000);
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ef4_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
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/* Wait for the reset bit to clear. */
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do {
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msleep(spintime);
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ctrl = ef4_mdio_read(port, mmd, MDIO_CTRL1);
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spins--;
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} while (spins && (ctrl & MDIO_CTRL1_RESET));
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return spins ? spins : -ETIMEDOUT;
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}
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static int ef4_mdio_check_mmd(struct ef4_nic *efx, int mmd)
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{
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int status;
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if (mmd != MDIO_MMD_AN) {
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/* Read MMD STATUS2 to check it is responding. */
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status = ef4_mdio_read(efx, mmd, MDIO_STAT2);
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if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
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netif_err(efx, hw, efx->net_dev,
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"PHY MMD %d not responding.\n", mmd);
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return -EIO;
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}
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}
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return 0;
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}
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/* This ought to be ridiculous overkill. We expect it to fail rarely */
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#define MDIO45_RESET_TIME 1000 /* ms */
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#define MDIO45_RESET_ITERS 100
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int ef4_mdio_wait_reset_mmds(struct ef4_nic *efx, unsigned int mmd_mask)
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{
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const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
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int tries = MDIO45_RESET_ITERS;
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int rc = 0;
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int in_reset;
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while (tries) {
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int mask = mmd_mask;
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int mmd = 0;
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int stat;
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in_reset = 0;
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while (mask) {
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if (mask & 1) {
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stat = ef4_mdio_read(efx, mmd, MDIO_CTRL1);
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if (stat < 0) {
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netif_err(efx, hw, efx->net_dev,
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"failed to read status of"
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" MMD %d\n", mmd);
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return -EIO;
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}
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if (stat & MDIO_CTRL1_RESET)
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in_reset |= (1 << mmd);
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}
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mask = mask >> 1;
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mmd++;
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}
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if (!in_reset)
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break;
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tries--;
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msleep(spintime);
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}
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if (in_reset != 0) {
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netif_err(efx, hw, efx->net_dev,
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"not all MMDs came out of reset in time."
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" MMDs still in reset: %x\n", in_reset);
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rc = -ETIMEDOUT;
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}
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return rc;
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}
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int ef4_mdio_check_mmds(struct ef4_nic *efx, unsigned int mmd_mask)
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{
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int mmd = 0, probe_mmd, devs1, devs2;
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u32 devices;
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/* Historically we have probed the PHYXS to find out what devices are
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* present,but that doesn't work so well if the PHYXS isn't expected
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* to exist, if so just find the first item in the list supplied. */
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probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
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__ffs(mmd_mask);
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/* Check all the expected MMDs are present */
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devs1 = ef4_mdio_read(efx, probe_mmd, MDIO_DEVS1);
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devs2 = ef4_mdio_read(efx, probe_mmd, MDIO_DEVS2);
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if (devs1 < 0 || devs2 < 0) {
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netif_err(efx, hw, efx->net_dev,
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"failed to read devices present\n");
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return -EIO;
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}
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devices = devs1 | (devs2 << 16);
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if ((devices & mmd_mask) != mmd_mask) {
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netif_err(efx, hw, efx->net_dev,
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"required MMDs not present: got %x, wanted %x\n",
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devices, mmd_mask);
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return -ENODEV;
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}
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netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
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/* Check all required MMDs are responding and happy. */
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while (mmd_mask) {
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if ((mmd_mask & 1) && ef4_mdio_check_mmd(efx, mmd))
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return -EIO;
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mmd_mask = mmd_mask >> 1;
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mmd++;
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}
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return 0;
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}
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bool ef4_mdio_links_ok(struct ef4_nic *efx, unsigned int mmd_mask)
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{
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/* If the port is in loopback, then we should only consider a subset
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* of mmd's */
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if (LOOPBACK_INTERNAL(efx))
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return true;
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else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
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return false;
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else if (ef4_phy_mode_disabled(efx->phy_mode))
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return false;
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else if (efx->loopback_mode == LOOPBACK_PHYXS)
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mmd_mask &= ~(MDIO_DEVS_PHYXS |
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MDIO_DEVS_PCS |
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MDIO_DEVS_PMAPMD |
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MDIO_DEVS_AN);
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else if (efx->loopback_mode == LOOPBACK_PCS)
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mmd_mask &= ~(MDIO_DEVS_PCS |
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MDIO_DEVS_PMAPMD |
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MDIO_DEVS_AN);
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else if (efx->loopback_mode == LOOPBACK_PMAPMD)
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mmd_mask &= ~(MDIO_DEVS_PMAPMD |
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MDIO_DEVS_AN);
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return mdio45_links_ok(&efx->mdio, mmd_mask);
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}
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void ef4_mdio_transmit_disable(struct ef4_nic *efx)
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{
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ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
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MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
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efx->phy_mode & PHY_MODE_TX_DISABLED);
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}
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void ef4_mdio_phy_reconfigure(struct ef4_nic *efx)
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{
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ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
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MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
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efx->loopback_mode == LOOPBACK_PMAPMD);
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ef4_mdio_set_flag(efx, MDIO_MMD_PCS,
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MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
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efx->loopback_mode == LOOPBACK_PCS);
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ef4_mdio_set_flag(efx, MDIO_MMD_PHYXS,
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MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
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efx->loopback_mode == LOOPBACK_PHYXS_WS);
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}
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static void ef4_mdio_set_mmd_lpower(struct ef4_nic *efx,
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int lpower, int mmd)
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{
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int stat = ef4_mdio_read(efx, mmd, MDIO_STAT1);
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netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
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mmd, lpower);
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if (stat & MDIO_STAT1_LPOWERABLE) {
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ef4_mdio_set_flag(efx, mmd, MDIO_CTRL1,
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MDIO_CTRL1_LPOWER, lpower);
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}
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}
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void ef4_mdio_set_mmds_lpower(struct ef4_nic *efx,
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int low_power, unsigned int mmd_mask)
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{
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int mmd = 0;
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mmd_mask &= ~MDIO_DEVS_AN;
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while (mmd_mask) {
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if (mmd_mask & 1)
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ef4_mdio_set_mmd_lpower(efx, low_power, mmd);
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mmd_mask = (mmd_mask >> 1);
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mmd++;
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}
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}
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/**
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* ef4_mdio_set_link_ksettings - Set (some of) the PHY settings over MDIO.
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* @efx: Efx NIC
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* @cmd: New settings
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*/
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int ef4_mdio_set_link_ksettings(struct ef4_nic *efx,
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const struct ethtool_link_ksettings *cmd)
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{
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struct ethtool_link_ksettings prev = {
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.base.cmd = ETHTOOL_GLINKSETTINGS
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};
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u32 prev_advertising, advertising;
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u32 prev_supported;
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efx->phy_op->get_link_ksettings(efx, &prev);
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ethtool_convert_link_mode_to_legacy_u32(&advertising,
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cmd->link_modes.advertising);
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ethtool_convert_link_mode_to_legacy_u32(&prev_advertising,
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prev.link_modes.advertising);
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ethtool_convert_link_mode_to_legacy_u32(&prev_supported,
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prev.link_modes.supported);
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if (advertising == prev_advertising &&
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cmd->base.speed == prev.base.speed &&
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cmd->base.duplex == prev.base.duplex &&
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cmd->base.port == prev.base.port &&
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cmd->base.autoneg == prev.base.autoneg)
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return 0;
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/* We can only change these settings for -T PHYs */
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if (prev.base.port != PORT_TP || cmd->base.port != PORT_TP)
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return -EINVAL;
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/* Check that PHY supports these settings */
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if (!cmd->base.autoneg ||
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(advertising | SUPPORTED_Autoneg) & ~prev_supported)
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return -EINVAL;
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ef4_link_set_advertising(efx, advertising | ADVERTISED_Autoneg);
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ef4_mdio_an_reconfigure(efx);
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return 0;
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}
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/**
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* ef4_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
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* @efx: Efx NIC
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*/
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void ef4_mdio_an_reconfigure(struct ef4_nic *efx)
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{
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int reg;
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WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
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/* Set up the base page */
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reg = ADVERTISE_CSMA | ADVERTISE_RESV;
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if (efx->link_advertising & ADVERTISED_Pause)
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reg |= ADVERTISE_PAUSE_CAP;
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if (efx->link_advertising & ADVERTISED_Asym_Pause)
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reg |= ADVERTISE_PAUSE_ASYM;
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ef4_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
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/* Set up the (extended) next page */
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efx->phy_op->set_npage_adv(efx, efx->link_advertising);
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/* Enable and restart AN */
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reg = ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
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reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
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ef4_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
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}
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u8 ef4_mdio_get_pause(struct ef4_nic *efx)
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{
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BUILD_BUG_ON(EF4_FC_AUTO & (EF4_FC_RX | EF4_FC_TX));
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if (!(efx->wanted_fc & EF4_FC_AUTO))
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return efx->wanted_fc;
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WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
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return mii_resolve_flowctrl_fdx(
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mii_advertise_flowctrl(efx->wanted_fc),
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ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
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}
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int ef4_mdio_test_alive(struct ef4_nic *efx)
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{
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int rc;
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int devad = __ffs(efx->mdio.mmds);
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u16 physid1, physid2;
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mutex_lock(&efx->mac_lock);
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physid1 = ef4_mdio_read(efx, devad, MDIO_DEVID1);
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physid2 = ef4_mdio_read(efx, devad, MDIO_DEVID2);
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if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
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(physid2 == 0x0000) || (physid2 == 0xffff)) {
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netif_err(efx, hw, efx->net_dev,
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"no MDIO PHY present with ID %d\n", efx->mdio.prtad);
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rc = -EINVAL;
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} else {
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rc = ef4_mdio_check_mmds(efx, efx->mdio.mmds);
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}
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mutex_unlock(&efx->mac_lock);
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return rc;
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}
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