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1// SPDX-License-Identifier: GPL-2.0-only2/****************************************************************************3 * Driver for Solarflare network controllers and boards4 * Copyright 2006-2011 Solarflare Communications Inc.5 */6/*7 * Useful functions for working with MDIO clause 45 PHYs8 */9#include <linux/types.h>10#include <linux/ethtool.h>11#include <linux/delay.h>12#include "net_driver.h"13#include "mdio_10g.h"14#include "workarounds.h"15 16unsigned ef4_mdio_id_oui(u32 id)17{18 unsigned oui = 0;19 int i;20 21 /* The bits of the OUI are designated a..x, with a=0 and b variable.22 * In the id register c is the MSB but the OUI is conventionally23 * written as bytes h..a, p..i, x..q. Reorder the bits accordingly. */24 for (i = 0; i < 22; ++i)25 if (id & (1 << (i + 10)))26 oui |= 1 << (i ^ 7);27 28 return oui;29}30 31int ef4_mdio_reset_mmd(struct ef4_nic *port, int mmd,32 int spins, int spintime)33{34 u32 ctrl;35 36 /* Catch callers passing values in the wrong units (or just silly) */37 EF4_BUG_ON_PARANOID(spins * spintime >= 5000);38 39 ef4_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);40 /* Wait for the reset bit to clear. */41 do {42 msleep(spintime);43 ctrl = ef4_mdio_read(port, mmd, MDIO_CTRL1);44 spins--;45 46 } while (spins && (ctrl & MDIO_CTRL1_RESET));47 48 return spins ? spins : -ETIMEDOUT;49}50 51static int ef4_mdio_check_mmd(struct ef4_nic *efx, int mmd)52{53 int status;54 55 if (mmd != MDIO_MMD_AN) {56 /* Read MMD STATUS2 to check it is responding. */57 status = ef4_mdio_read(efx, mmd, MDIO_STAT2);58 if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {59 netif_err(efx, hw, efx->net_dev,60 "PHY MMD %d not responding.\n", mmd);61 return -EIO;62 }63 }64 65 return 0;66}67 68/* This ought to be ridiculous overkill. We expect it to fail rarely */69#define MDIO45_RESET_TIME 1000 /* ms */70#define MDIO45_RESET_ITERS 10071 72int ef4_mdio_wait_reset_mmds(struct ef4_nic *efx, unsigned int mmd_mask)73{74 const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;75 int tries = MDIO45_RESET_ITERS;76 int rc = 0;77 int in_reset;78 79 while (tries) {80 int mask = mmd_mask;81 int mmd = 0;82 int stat;83 in_reset = 0;84 while (mask) {85 if (mask & 1) {86 stat = ef4_mdio_read(efx, mmd, MDIO_CTRL1);87 if (stat < 0) {88 netif_err(efx, hw, efx->net_dev,89 "failed to read status of"90 " MMD %d\n", mmd);91 return -EIO;92 }93 if (stat & MDIO_CTRL1_RESET)94 in_reset |= (1 << mmd);95 }96 mask = mask >> 1;97 mmd++;98 }99 if (!in_reset)100 break;101 tries--;102 msleep(spintime);103 }104 if (in_reset != 0) {105 netif_err(efx, hw, efx->net_dev,106 "not all MMDs came out of reset in time."107 " MMDs still in reset: %x\n", in_reset);108 rc = -ETIMEDOUT;109 }110 return rc;111}112 113int ef4_mdio_check_mmds(struct ef4_nic *efx, unsigned int mmd_mask)114{115 int mmd = 0, probe_mmd, devs1, devs2;116 u32 devices;117 118 /* Historically we have probed the PHYXS to find out what devices are119 * present,but that doesn't work so well if the PHYXS isn't expected120 * to exist, if so just find the first item in the list supplied. */121 probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :122 __ffs(mmd_mask);123 124 /* Check all the expected MMDs are present */125 devs1 = ef4_mdio_read(efx, probe_mmd, MDIO_DEVS1);126 devs2 = ef4_mdio_read(efx, probe_mmd, MDIO_DEVS2);127 if (devs1 < 0 || devs2 < 0) {128 netif_err(efx, hw, efx->net_dev,129 "failed to read devices present\n");130 return -EIO;131 }132 devices = devs1 | (devs2 << 16);133 if ((devices & mmd_mask) != mmd_mask) {134 netif_err(efx, hw, efx->net_dev,135 "required MMDs not present: got %x, wanted %x\n",136 devices, mmd_mask);137 return -ENODEV;138 }139 netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);140 141 /* Check all required MMDs are responding and happy. */142 while (mmd_mask) {143 if ((mmd_mask & 1) && ef4_mdio_check_mmd(efx, mmd))144 return -EIO;145 mmd_mask = mmd_mask >> 1;146 mmd++;147 }148 149 return 0;150}151 152bool ef4_mdio_links_ok(struct ef4_nic *efx, unsigned int mmd_mask)153{154 /* If the port is in loopback, then we should only consider a subset155 * of mmd's */156 if (LOOPBACK_INTERNAL(efx))157 return true;158 else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)159 return false;160 else if (ef4_phy_mode_disabled(efx->phy_mode))161 return false;162 else if (efx->loopback_mode == LOOPBACK_PHYXS)163 mmd_mask &= ~(MDIO_DEVS_PHYXS |164 MDIO_DEVS_PCS |165 MDIO_DEVS_PMAPMD |166 MDIO_DEVS_AN);167 else if (efx->loopback_mode == LOOPBACK_PCS)168 mmd_mask &= ~(MDIO_DEVS_PCS |169 MDIO_DEVS_PMAPMD |170 MDIO_DEVS_AN);171 else if (efx->loopback_mode == LOOPBACK_PMAPMD)172 mmd_mask &= ~(MDIO_DEVS_PMAPMD |173 MDIO_DEVS_AN);174 175 return mdio45_links_ok(&efx->mdio, mmd_mask);176}177 178void ef4_mdio_transmit_disable(struct ef4_nic *efx)179{180 ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD,181 MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,182 efx->phy_mode & PHY_MODE_TX_DISABLED);183}184 185void ef4_mdio_phy_reconfigure(struct ef4_nic *efx)186{187 ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD,188 MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,189 efx->loopback_mode == LOOPBACK_PMAPMD);190 ef4_mdio_set_flag(efx, MDIO_MMD_PCS,191 MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,192 efx->loopback_mode == LOOPBACK_PCS);193 ef4_mdio_set_flag(efx, MDIO_MMD_PHYXS,194 MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,195 efx->loopback_mode == LOOPBACK_PHYXS_WS);196}197 198static void ef4_mdio_set_mmd_lpower(struct ef4_nic *efx,199 int lpower, int mmd)200{201 int stat = ef4_mdio_read(efx, mmd, MDIO_STAT1);202 203 netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",204 mmd, lpower);205 206 if (stat & MDIO_STAT1_LPOWERABLE) {207 ef4_mdio_set_flag(efx, mmd, MDIO_CTRL1,208 MDIO_CTRL1_LPOWER, lpower);209 }210}211 212void ef4_mdio_set_mmds_lpower(struct ef4_nic *efx,213 int low_power, unsigned int mmd_mask)214{215 int mmd = 0;216 mmd_mask &= ~MDIO_DEVS_AN;217 while (mmd_mask) {218 if (mmd_mask & 1)219 ef4_mdio_set_mmd_lpower(efx, low_power, mmd);220 mmd_mask = (mmd_mask >> 1);221 mmd++;222 }223}224 225/**226 * ef4_mdio_set_link_ksettings - Set (some of) the PHY settings over MDIO.227 * @efx: Efx NIC228 * @cmd: New settings229 */230int ef4_mdio_set_link_ksettings(struct ef4_nic *efx,231 const struct ethtool_link_ksettings *cmd)232{233 struct ethtool_link_ksettings prev = {234 .base.cmd = ETHTOOL_GLINKSETTINGS235 };236 u32 prev_advertising, advertising;237 u32 prev_supported;238 239 efx->phy_op->get_link_ksettings(efx, &prev);240 241 ethtool_convert_link_mode_to_legacy_u32(&advertising,242 cmd->link_modes.advertising);243 ethtool_convert_link_mode_to_legacy_u32(&prev_advertising,244 prev.link_modes.advertising);245 ethtool_convert_link_mode_to_legacy_u32(&prev_supported,246 prev.link_modes.supported);247 248 if (advertising == prev_advertising &&249 cmd->base.speed == prev.base.speed &&250 cmd->base.duplex == prev.base.duplex &&251 cmd->base.port == prev.base.port &&252 cmd->base.autoneg == prev.base.autoneg)253 return 0;254 255 /* We can only change these settings for -T PHYs */256 if (prev.base.port != PORT_TP || cmd->base.port != PORT_TP)257 return -EINVAL;258 259 /* Check that PHY supports these settings */260 if (!cmd->base.autoneg ||261 (advertising | SUPPORTED_Autoneg) & ~prev_supported)262 return -EINVAL;263 264 ef4_link_set_advertising(efx, advertising | ADVERTISED_Autoneg);265 ef4_mdio_an_reconfigure(efx);266 return 0;267}268 269/**270 * ef4_mdio_an_reconfigure - Push advertising flags and restart autonegotiation271 * @efx: Efx NIC272 */273void ef4_mdio_an_reconfigure(struct ef4_nic *efx)274{275 int reg;276 277 WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));278 279 /* Set up the base page */280 reg = ADVERTISE_CSMA | ADVERTISE_RESV;281 if (efx->link_advertising & ADVERTISED_Pause)282 reg |= ADVERTISE_PAUSE_CAP;283 if (efx->link_advertising & ADVERTISED_Asym_Pause)284 reg |= ADVERTISE_PAUSE_ASYM;285 ef4_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);286 287 /* Set up the (extended) next page */288 efx->phy_op->set_npage_adv(efx, efx->link_advertising);289 290 /* Enable and restart AN */291 reg = ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);292 reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;293 ef4_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);294}295 296u8 ef4_mdio_get_pause(struct ef4_nic *efx)297{298 BUILD_BUG_ON(EF4_FC_AUTO & (EF4_FC_RX | EF4_FC_TX));299 300 if (!(efx->wanted_fc & EF4_FC_AUTO))301 return efx->wanted_fc;302 303 WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));304 305 return mii_resolve_flowctrl_fdx(306 mii_advertise_flowctrl(efx->wanted_fc),307 ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));308}309 310int ef4_mdio_test_alive(struct ef4_nic *efx)311{312 int rc;313 int devad = __ffs(efx->mdio.mmds);314 u16 physid1, physid2;315 316 mutex_lock(&efx->mac_lock);317 318 physid1 = ef4_mdio_read(efx, devad, MDIO_DEVID1);319 physid2 = ef4_mdio_read(efx, devad, MDIO_DEVID2);320 321 if ((physid1 == 0x0000) || (physid1 == 0xffff) ||322 (physid2 == 0x0000) || (physid2 == 0xffff)) {323 netif_err(efx, hw, efx->net_dev,324 "no MDIO PHY present with ID %d\n", efx->mdio.prtad);325 rc = -EINVAL;326 } else {327 rc = ef4_mdio_check_mmds(efx, efx->mdio.mmds);328 }329 330 mutex_unlock(&efx->mac_lock);331 return rc;332}333