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

   1/****************************************************************************
   2 * Driver for Solarflare network controllers and boards
   3 * Copyright 2006-2011 Solarflare Communications Inc.
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms of the GNU General Public License version 2 as published
   7 * by the Free Software Foundation, incorporated herein by reference.
   8 */
   9/*
  10 * Useful functions for working with MDIO clause 45 PHYs
  11 */
  12#include <linux/types.h>
  13#include <linux/ethtool.h>
  14#include <linux/delay.h>
  15#include "net_driver.h"
  16#include "mdio_10g.h"
  17#include "workarounds.h"
  18
  19unsigned efx_mdio_id_oui(u32 id)
  20{
  21        unsigned oui = 0;
  22        int i;
  23
  24        /* The bits of the OUI are designated a..x, with a=0 and b variable.
  25         * In the id register c is the MSB but the OUI is conventionally
  26         * written as bytes h..a, p..i, x..q.  Reorder the bits accordingly. */
  27        for (i = 0; i < 22; ++i)
  28                if (id & (1 << (i + 10)))
  29                        oui |= 1 << (i ^ 7);
  30
  31        return oui;
  32}
  33
  34int efx_mdio_reset_mmd(struct efx_nic *port, int mmd,
  35                            int spins, int spintime)
  36{
  37        u32 ctrl;
  38
  39        /* Catch callers passing values in the wrong units (or just silly) */
  40        EFX_BUG_ON_PARANOID(spins * spintime >= 5000);
  41
  42        efx_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
  43        /* Wait for the reset bit to clear. */
  44        do {
  45                msleep(spintime);
  46                ctrl = efx_mdio_read(port, mmd, MDIO_CTRL1);
  47                spins--;
  48
  49        } while (spins && (ctrl & MDIO_CTRL1_RESET));
  50
  51        return spins ? spins : -ETIMEDOUT;
  52}
  53
  54static int efx_mdio_check_mmd(struct efx_nic *efx, int mmd)
  55{
  56        int status;
  57
  58        if (mmd != MDIO_MMD_AN) {
  59                /* Read MMD STATUS2 to check it is responding. */
  60                status = efx_mdio_read(efx, mmd, MDIO_STAT2);
  61                if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
  62                        netif_err(efx, hw, efx->net_dev,
  63                                  "PHY MMD %d not responding.\n", mmd);
  64                        return -EIO;
  65                }
  66        }
  67
  68        return 0;
  69}
  70
  71/* This ought to be ridiculous overkill. We expect it to fail rarely */
  72#define MDIO45_RESET_TIME       1000 /* ms */
  73#define MDIO45_RESET_ITERS      100
  74
  75int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
  76{
  77        const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
  78        int tries = MDIO45_RESET_ITERS;
  79        int rc = 0;
  80        int in_reset;
  81
  82        while (tries) {
  83                int mask = mmd_mask;
  84                int mmd = 0;
  85                int stat;
  86                in_reset = 0;
  87                while (mask) {
  88                        if (mask & 1) {
  89                                stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
  90                                if (stat < 0) {
  91                                        netif_err(efx, hw, efx->net_dev,
  92                                                  "failed to read status of"
  93                                                  " MMD %d\n", mmd);
  94                                        return -EIO;
  95                                }
  96                                if (stat & MDIO_CTRL1_RESET)
  97                                        in_reset |= (1 << mmd);
  98                        }
  99                        mask = mask >> 1;
 100                        mmd++;
 101                }
 102                if (!in_reset)
 103                        break;
 104                tries--;
 105                msleep(spintime);
 106        }
 107        if (in_reset != 0) {
 108                netif_err(efx, hw, efx->net_dev,
 109                          "not all MMDs came out of reset in time."
 110                          " MMDs still in reset: %x\n", in_reset);
 111                rc = -ETIMEDOUT;
 112        }
 113        return rc;
 114}
 115
 116int efx_mdio_check_mmds(struct efx_nic *efx, unsigned int mmd_mask)
 117{
 118        int mmd = 0, probe_mmd, devs1, devs2;
 119        u32 devices;
 120
 121        /* Historically we have probed the PHYXS to find out what devices are
 122         * present,but that doesn't work so well if the PHYXS isn't expected
 123         * to exist, if so just find the first item in the list supplied. */
 124        probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
 125            __ffs(mmd_mask);
 126
 127        /* Check all the expected MMDs are present */
 128        devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
 129        devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
 130        if (devs1 < 0 || devs2 < 0) {
 131                netif_err(efx, hw, efx->net_dev,
 132                          "failed to read devices present\n");
 133                return -EIO;
 134        }
 135        devices = devs1 | (devs2 << 16);
 136        if ((devices & mmd_mask) != mmd_mask) {
 137                netif_err(efx, hw, efx->net_dev,
 138                          "required MMDs not present: got %x, wanted %x\n",
 139                          devices, mmd_mask);
 140                return -ENODEV;
 141        }
 142        netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
 143
 144        /* Check all required MMDs are responding and happy. */
 145        while (mmd_mask) {
 146                if ((mmd_mask & 1) && efx_mdio_check_mmd(efx, mmd))
 147                        return -EIO;
 148                mmd_mask = mmd_mask >> 1;
 149                mmd++;
 150        }
 151
 152        return 0;
 153}
 154
 155bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
 156{
 157        /* If the port is in loopback, then we should only consider a subset
 158         * of mmd's */
 159        if (LOOPBACK_INTERNAL(efx))
 160                return true;
 161        else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
 162                return false;
 163        else if (efx_phy_mode_disabled(efx->phy_mode))
 164                return false;
 165        else if (efx->loopback_mode == LOOPBACK_PHYXS)
 166                mmd_mask &= ~(MDIO_DEVS_PHYXS |
 167                              MDIO_DEVS_PCS |
 168                              MDIO_DEVS_PMAPMD |
 169                              MDIO_DEVS_AN);
 170        else if (efx->loopback_mode == LOOPBACK_PCS)
 171                mmd_mask &= ~(MDIO_DEVS_PCS |
 172                              MDIO_DEVS_PMAPMD |
 173                              MDIO_DEVS_AN);
 174        else if (efx->loopback_mode == LOOPBACK_PMAPMD)
 175                mmd_mask &= ~(MDIO_DEVS_PMAPMD |
 176                              MDIO_DEVS_AN);
 177
 178        return mdio45_links_ok(&efx->mdio, mmd_mask);
 179}
 180
 181void efx_mdio_transmit_disable(struct efx_nic *efx)
 182{
 183        efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
 184                          MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
 185                          efx->phy_mode & PHY_MODE_TX_DISABLED);
 186}
 187
 188void efx_mdio_phy_reconfigure(struct efx_nic *efx)
 189{
 190        efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
 191                          MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
 192                          efx->loopback_mode == LOOPBACK_PMAPMD);
 193        efx_mdio_set_flag(efx, MDIO_MMD_PCS,
 194                          MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
 195                          efx->loopback_mode == LOOPBACK_PCS);
 196        efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
 197                          MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
 198                          efx->loopback_mode == LOOPBACK_PHYXS_WS);
 199}
 200
 201static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
 202                                    int lpower, int mmd)
 203{
 204        int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
 205
 206        netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
 207                  mmd, lpower);
 208
 209        if (stat & MDIO_STAT1_LPOWERABLE) {
 210                efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
 211                                  MDIO_CTRL1_LPOWER, lpower);
 212        }
 213}
 214
 215void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
 216                              int low_power, unsigned int mmd_mask)
 217{
 218        int mmd = 0;
 219        mmd_mask &= ~MDIO_DEVS_AN;
 220        while (mmd_mask) {
 221                if (mmd_mask & 1)
 222                        efx_mdio_set_mmd_lpower(efx, low_power, mmd);
 223                mmd_mask = (mmd_mask >> 1);
 224                mmd++;
 225        }
 226}
 227
 228/**
 229 * efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
 230 * @efx:                Efx NIC
 231 * @ecmd:               New settings
 232 */
 233int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
 234{
 235        struct ethtool_cmd prev = { .cmd = ETHTOOL_GSET };
 236
 237        efx->phy_op->get_settings(efx, &prev);
 238
 239        if (ecmd->advertising == prev.advertising &&
 240            ethtool_cmd_speed(ecmd) == ethtool_cmd_speed(&prev) &&
 241            ecmd->duplex == prev.duplex &&
 242            ecmd->port == prev.port &&
 243            ecmd->autoneg == prev.autoneg)
 244                return 0;
 245
 246        /* We can only change these settings for -T PHYs */
 247        if (prev.port != PORT_TP || ecmd->port != PORT_TP)
 248                return -EINVAL;
 249
 250        /* Check that PHY supports these settings */
 251        if (!ecmd->autoneg ||
 252            (ecmd->advertising | SUPPORTED_Autoneg) & ~prev.supported)
 253                return -EINVAL;
 254
 255        efx_link_set_advertising(efx, ecmd->advertising | ADVERTISED_Autoneg);
 256        efx_mdio_an_reconfigure(efx);
 257        return 0;
 258}
 259
 260/**
 261 * efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
 262 * @efx:                Efx NIC
 263 */
 264void efx_mdio_an_reconfigure(struct efx_nic *efx)
 265{
 266        int reg;
 267
 268        WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
 269
 270        /* Set up the base page */
 271        reg = ADVERTISE_CSMA | ADVERTISE_RESV;
 272        if (efx->link_advertising & ADVERTISED_Pause)
 273                reg |= ADVERTISE_PAUSE_CAP;
 274        if (efx->link_advertising & ADVERTISED_Asym_Pause)
 275                reg |= ADVERTISE_PAUSE_ASYM;
 276        efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
 277
 278        /* Set up the (extended) next page */
 279        efx->phy_op->set_npage_adv(efx, efx->link_advertising);
 280
 281        /* Enable and restart AN */
 282        reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
 283        reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
 284        efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
 285}
 286
 287u8 efx_mdio_get_pause(struct efx_nic *efx)
 288{
 289        BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));
 290
 291        if (!(efx->wanted_fc & EFX_FC_AUTO))
 292                return efx->wanted_fc;
 293
 294        WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
 295
 296        return mii_resolve_flowctrl_fdx(
 297                mii_advertise_flowctrl(efx->wanted_fc),
 298                efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
 299}
 300
 301int efx_mdio_test_alive(struct efx_nic *efx)
 302{
 303        int rc;
 304        int devad = __ffs(efx->mdio.mmds);
 305        u16 physid1, physid2;
 306
 307        mutex_lock(&efx->mac_lock);
 308
 309        physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
 310        physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
 311
 312        if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
 313            (physid2 == 0x0000) || (physid2 == 0xffff)) {
 314                netif_err(efx, hw, efx->net_dev,
 315                          "no MDIO PHY present with ID %d\n", efx->mdio.prtad);
 316                rc = -EINVAL;
 317        } else {
 318                rc = efx_mdio_check_mmds(efx, efx->mdio.mmds);
 319        }
 320
 321        mutex_unlock(&efx->mac_lock);
 322        return rc;
 323}
 324