drivers/net/sfc/mdio_10g.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2006-2008 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
  19 unsigned 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
  34 int 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
  54 static int efx_mdio_check_mmd(struct efx_nic *efx, int mmd, int fault_fatal)
  55 {
  56         int status;
  57
  58         if (LOOPBACK_INTERNAL(efx))
  59                 return 0;
  60
  61         if (mmd != MDIO_MMD_AN) {
  62                 /* Read MMD STATUS2 to check it is responding. */
  63                 status = efx_mdio_read(efx, mmd, MDIO_STAT2);
  64                 if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
  65                         EFX_ERR(efx, "PHY MMD %d not responding.\n", mmd);
  66                         return -EIO;
  67                 }
  68         }
  69
  70         /* Read MMD STATUS 1 to check for fault. */
  71         status = efx_mdio_read(efx, mmd, MDIO_STAT1);
  72         if (status & MDIO_STAT1_FAULT) {
  73                 if (fault_fatal) {
  74                         EFX_ERR(efx, "PHY MMD %d reporting fatal"
  75                                 " fault: status %x\n", mmd, status);
  76                         return -EIO;
  77                 } else {
  78                         EFX_LOG(efx, "PHY MMD %d reporting status"
  79                                 " %x (expected)\n", mmd, status);
  80                 }
  81         }
  82         return 0;
  83 }
  84
  85 /* This ought to be ridiculous overkill. We expect it to fail rarely */
  86 #define MDIO45_RESET_TIME       1000 /* ms */
  87 #define MDIO45_RESET_ITERS      100
  88
  89 int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
  90 {
  91         const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
  92         int tries = MDIO45_RESET_ITERS;
  93         int rc = 0;
  94         int in_reset;
  95
  96         while (tries) {
  97                 int mask = mmd_mask;
  98                 int mmd = 0;
  99                 int stat;
 100                 in_reset = 0;
 101                 while (mask) {
 102                         if (mask & 1) {
 103                                 stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
 104                                 if (stat < 0) {
 105                                         EFX_ERR(efx, "failed to read status of"
 106                                                 " MMD %d\n", mmd);
 107                                         return -EIO;
 108                                 }
 109                                 if (stat & MDIO_CTRL1_RESET)
 110                                         in_reset |= (1 << mmd);
 111                         }
 112                         mask = mask >> 1;
 113                         mmd++;
 114                 }
 115                 if (!in_reset)
 116                         break;
 117                 tries--;
 118                 msleep(spintime);
 119         }
 120         if (in_reset != 0) {
 121                 EFX_ERR(efx, "not all MMDs came out of reset in time."
 122                         " MMDs still in reset: %x\n", in_reset);
 123                 rc = -ETIMEDOUT;
 124         }
 125         return rc;
 126 }
 127
 128 int efx_mdio_check_mmds(struct efx_nic *efx,
 129                         unsigned int mmd_mask, unsigned int fatal_mask)
 130 {
 131         int mmd = 0, probe_mmd, devs1, devs2;
 132         u32 devices;
 133
 134         /* Historically we have probed the PHYXS to find out what devices are
 135          * present,but that doesn't work so well if the PHYXS isn't expected
 136          * to exist, if so just find the first item in the list supplied. */
 137         probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
 138             __ffs(mmd_mask);
 139
 140         /* Check all the expected MMDs are present */
 141         devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
 142         devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
 143         if (devs1 < 0 || devs2 < 0) {
 144                 EFX_ERR(efx, "failed to read devices present\n");
 145                 return -EIO;
 146         }
 147         devices = devs1 | (devs2 << 16);
 148         if ((devices & mmd_mask) != mmd_mask) {
 149                 EFX_ERR(efx, "required MMDs not present: got %x, "
 150                         "wanted %x\n", devices, mmd_mask);
 151                 return -ENODEV;
 152         }
 153         EFX_TRACE(efx, "Devices present: %x\n", devices);
 154
 155         /* Check all required MMDs are responding and happy. */
 156         while (mmd_mask) {
 157                 if (mmd_mask & 1) {
 158                         int fault_fatal = fatal_mask & 1;
 159                         if (efx_mdio_check_mmd(efx, mmd, fault_fatal))
 160                                 return -EIO;
 161                 }
 162                 mmd_mask = mmd_mask >> 1;
 163                 fatal_mask = fatal_mask >> 1;
 164                 mmd++;
 165         }
 166
 167         return 0;
 168 }
 169
 170 bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
 171 {
 172         /* If the port is in loopback, then we should only consider a subset
 173          * of mmd's */
 174         if (LOOPBACK_INTERNAL(efx))
 175                 return true;
 176         else if (efx->loopback_mode == LOOPBACK_NETWORK)
 177                 return false;
 178         else if (efx_phy_mode_disabled(efx->phy_mode))
 179                 return false;
 180         else if (efx->loopback_mode == LOOPBACK_PHYXS)
 181                 mmd_mask &= ~(MDIO_DEVS_PHYXS |
 182                               MDIO_DEVS_PCS |
 183                               MDIO_DEVS_PMAPMD |
 184                               MDIO_DEVS_AN);
 185         else if (efx->loopback_mode == LOOPBACK_PCS)
 186                 mmd_mask &= ~(MDIO_DEVS_PCS |
 187                               MDIO_DEVS_PMAPMD |
 188                               MDIO_DEVS_AN);
 189         else if (efx->loopback_mode == LOOPBACK_PMAPMD)
 190                 mmd_mask &= ~(MDIO_DEVS_PMAPMD |
 191                               MDIO_DEVS_AN);
 192
 193         return mdio45_links_ok(&efx->mdio, mmd_mask);
 194 }
 195
 196 void efx_mdio_transmit_disable(struct efx_nic *efx)
 197 {
 198         efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
 199                           MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
 200                           efx->phy_mode & PHY_MODE_TX_DISABLED);
 201 }
 202
 203 void efx_mdio_phy_reconfigure(struct efx_nic *efx)
 204 {
 205         efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
 206                           MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
 207                           efx->loopback_mode == LOOPBACK_PMAPMD);
 208         efx_mdio_set_flag(efx, MDIO_MMD_PCS,
 209                           MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
 210                           efx->loopback_mode == LOOPBACK_PCS);
 211         efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
 212                           MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
 213                           efx->loopback_mode == LOOPBACK_NETWORK);
 214 }
 215
 216 static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
 217                                     int lpower, int mmd)
 218 {
 219         int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
 220
 221         EFX_TRACE(efx, "Setting low power mode for MMD %d to %d\n",
 222                   mmd, lpower);
 223
 224         if (stat & MDIO_STAT1_LPOWERABLE) {
 225                 efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
 226                                   MDIO_CTRL1_LPOWER, lpower);
 227         }
 228 }
 229
 230 void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
 231                               int low_power, unsigned int mmd_mask)
 232 {
 233         int mmd = 0;
 234         mmd_mask &= ~MDIO_DEVS_AN;
 235         while (mmd_mask) {
 236                 if (mmd_mask & 1)
 237                         efx_mdio_set_mmd_lpower(efx, low_power, mmd);
 238                 mmd_mask = (mmd_mask >> 1);
 239                 mmd++;
 240         }
 241 }
 242
 243 /**
 244  * efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
 245  * @efx:                Efx NIC
 246  * @ecmd:               New settings
 247  */
 248 int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
 249 {
 250         struct ethtool_cmd prev;
 251
 252         efx->phy_op->get_settings(efx, &prev);
 253
 254         if (ecmd->advertising == prev.advertising &&
 255             ecmd->speed == prev.speed &&
 256             ecmd->duplex == prev.duplex &&
 257             ecmd->port == prev.port &&
 258             ecmd->autoneg == prev.autoneg)
 259                 return 0;
 260
 261         /* We can only change these settings for -T PHYs */
 262         if (prev.port != PORT_TP || ecmd->port != PORT_TP)
 263                 return -EINVAL;
 264
 265         /* Check that PHY supports these settings */
 266         if (!ecmd->autoneg ||
 267             (ecmd->advertising | SUPPORTED_Autoneg) & ~prev.supported)
 268                 return -EINVAL;
 269
 270         efx_link_set_advertising(efx, ecmd->advertising | ADVERTISED_Autoneg);
 271         efx_mdio_an_reconfigure(efx);
 272         return 0;
 273 }
 274
 275 /**
 276  * efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
 277  * @efx:                Efx NIC
 278  */
 279 void efx_mdio_an_reconfigure(struct efx_nic *efx)
 280 {
 281         bool xnp = (efx->link_advertising & ADVERTISED_10000baseT_Full
 282                     || EFX_WORKAROUND_13204(efx));
 283         int reg;
 284
 285         WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
 286
 287         /* Set up the base page */
 288         reg = ADVERTISE_CSMA;
 289         if (efx->link_advertising & ADVERTISED_10baseT_Half)
 290                 reg |= ADVERTISE_10HALF;
 291         if (efx->link_advertising & ADVERTISED_10baseT_Full)
 292                 reg |= ADVERTISE_10FULL;
 293         if (efx->link_advertising & ADVERTISED_100baseT_Half)
 294                 reg |= ADVERTISE_100HALF;
 295         if (efx->link_advertising & ADVERTISED_100baseT_Full)
 296                 reg |= ADVERTISE_100FULL;
 297         if (xnp)
 298                 reg |= ADVERTISE_RESV;
 299         else if (efx->link_advertising & (ADVERTISED_1000baseT_Half |
 300                                           ADVERTISED_1000baseT_Full))
 301                 reg |= ADVERTISE_NPAGE;
 302         if (efx->link_advertising & ADVERTISED_Pause)
 303                 reg |= ADVERTISE_PAUSE_CAP;
 304         if (efx->link_advertising & ADVERTISED_Asym_Pause)
 305                 reg |= ADVERTISE_PAUSE_ASYM;
 306         efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
 307
 308         /* Set up the (extended) next page if necessary */
 309         if (efx->phy_op->set_npage_adv)
 310                 efx->phy_op->set_npage_adv(efx, efx->link_advertising);
 311
 312         /* Enable and restart AN */
 313         reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
 314         reg |= MDIO_AN_CTRL1_ENABLE;
 315         if (!(EFX_WORKAROUND_15195(efx) &&
 316               LOOPBACK_MASK(efx) & efx->phy_op->loopbacks))
 317                 reg |= MDIO_AN_CTRL1_RESTART;
 318         if (xnp)
 319                 reg |= MDIO_AN_CTRL1_XNP;
 320         else
 321                 reg &= ~MDIO_AN_CTRL1_XNP;
 322         efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
 323 }
 324
 325 enum efx_fc_type efx_mdio_get_pause(struct efx_nic *efx)
 326 {
 327         BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));
 328
 329         if (!(efx->wanted_fc & EFX_FC_AUTO))
 330                 return efx->wanted_fc;
 331
 332         WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
 333
 334         return mii_resolve_flowctrl_fdx(
 335                 mii_advertise_flowctrl(efx->wanted_fc),
 336                 efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
 337 }