LXR linux/drivers/net/ethernet/sfc/falcon/mdio

   1// SPDX-License-Identifier: GPL-2.0-only
   2/****************************************************************************
   3 * Driver for Solarflare network controllers and boards
   4 * Copyright 2006-2011 Solarflare Communications Inc.
   5 */
   6/*
   7 * Useful functions for working with MDIO clause 45 PHYs
   8 */
   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 conventionally
  23         * 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      100
  71
  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 are
 119         * present,but that doesn't work so well if the PHYXS isn't expected
 120         * 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 subset
 155         * 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 NIC
 228 * @cmd:                New settings
 229 */
 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_GLINKSETTINGS
 235        };
 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 autonegotiation
 271 * @efx:                Efx NIC
 272 */
 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