drivers/net/sfc/mdio_10g.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2006-2009 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 #include "nic.h"
  19
  20 unsigned efx_mdio_id_oui(u32 id)
  21 {
  22         unsigned oui = 0;
  23         int i;
  24
  25         /* The bits of the OUI are designated a..x, with a=0 and b variable.
  26          * In the id register c is the MSB but the OUI is conventionally
  27          * written as bytes h..a, p..i, x..q.  Reorder the bits accordingly. */
  28         for (i = 0; i < 22; ++i)
  29                 if (id & (1 << (i + 10)))
  30                         oui |= 1 << (i ^ 7);
  31
  32         return oui;
  33 }
  34
  35 int efx_mdio_reset_mmd(struct efx_nic *port, int mmd,
  36                             int spins, int spintime)
  37 {
  38         u32 ctrl;
  39
  40         /* Catch callers passing values in the wrong units (or just silly) */
  41         EFX_BUG_ON_PARANOID(spins * spintime >= 5000);
  42
  43         efx_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
  44         /* Wait for the reset bit to clear. */
  45         do {
  46                 msleep(spintime);
  47                 ctrl = efx_mdio_read(port, mmd, MDIO_CTRL1);
  48                 spins--;
  49
  50         } while (spins && (ctrl & MDIO_CTRL1_RESET));
  51
  52         return spins ? spins : -ETIMEDOUT;
  53 }
  54
  55 static int efx_mdio_check_mmd(struct efx_nic *efx, int mmd, int fault_fatal)
  56 {
  57         int status;
  58
  59         if (LOOPBACK_INTERNAL(efx))
  60                 return 0;
  61
  62         if (mmd != MDIO_MMD_AN) {
  63                 /* Read MMD STATUS2 to check it is responding. */
  64                 status = efx_mdio_read(efx, mmd, MDIO_STAT2);
  65                 if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
  66                         netif_err(efx, hw, efx->net_dev,
  67                                   "PHY MMD %d not responding.\n", mmd);
  68                         return -EIO;
  69                 }
  70         }
  71
  72         /* Read MMD STATUS 1 to check for fault. */
  73         status = efx_mdio_read(efx, mmd, MDIO_STAT1);
  74         if (status & MDIO_STAT1_FAULT) {
  75                 if (fault_fatal) {
  76                         netif_err(efx, hw, efx->net_dev,
  77                                   "PHY MMD %d reporting fatal"
  78                                   " fault: status %x\n", mmd, status);
  79                         return -EIO;
  80                 } else {
  81                         netif_dbg(efx, hw, efx->net_dev,
  82                                   "PHY MMD %d reporting status"
  83                                   " %x (expected)\n", mmd, status);
  84                 }
  85         }
  86         return 0;
  87 }
  88
  89 /* This ought to be ridiculous overkill. We expect it to fail rarely */
  90 #define MDIO45_RESET_TIME       1000 /* ms */
  91 #define MDIO45_RESET_ITERS      100
  92
  93 int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
  94 {
  95         const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
  96         int tries = MDIO45_RESET_ITERS;
  97         int rc = 0;
  98         int in_reset;
  99
 100         while (tries) {
 101                 int mask = mmd_mask;
 102                 int mmd = 0;
 103                 int stat;
 104                 in_reset = 0;
 105                 while (mask) {
 106                         if (mask & 1) {
 107                                 stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
 108                                 if (stat < 0) {
 109                                         netif_err(efx, hw, efx->net_dev,
 110                                                   "failed to read status of"
 111                                                   " MMD %d\n", mmd);
 112                                         return -EIO;
 113                                 }
 114                                 if (stat & MDIO_CTRL1_RESET)
 115                                         in_reset |= (1 << mmd);
 116                         }
 117                         mask = mask >> 1;
 118                         mmd++;
 119                 }
 120                 if (!in_reset)
 121                         break;
 122                 tries--;
 123                 msleep(spintime);
 124         }
 125         if (in_reset != 0) {
 126                 netif_err(efx, hw, efx->net_dev,
 127                           "not all MMDs came out of reset in time."
 128                           " MMDs still in reset: %x\n", in_reset);
 129                 rc = -ETIMEDOUT;
 130         }
 131         return rc;
 132 }
 133
 134 int efx_mdio_check_mmds(struct efx_nic *efx,
 135                         unsigned int mmd_mask, unsigned int fatal_mask)
 136 {
 137         int mmd = 0, probe_mmd, devs1, devs2;
 138         u32 devices;
 139
 140         /* Historically we have probed the PHYXS to find out what devices are
 141          * present,but that doesn't work so well if the PHYXS isn't expected
 142          * to exist, if so just find the first item in the list supplied. */
 143         probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
 144             __ffs(mmd_mask);
 145
 146         /* Check all the expected MMDs are present */
 147         devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
 148         devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
 149         if (devs1 < 0 || devs2 < 0) {
 150                 netif_err(efx, hw, efx->net_dev,
 151                           "failed to read devices present\n");
 152                 return -EIO;
 153         }
 154         devices = devs1 | (devs2 << 16);
 155         if ((devices & mmd_mask) != mmd_mask) {
 156                 netif_err(efx, hw, efx->net_dev,
 157                           "required MMDs not present: got %x, wanted %x\n",
 158                           devices, mmd_mask);
 159                 return -ENODEV;
 160         }
 161         netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
 162
 163         /* Check all required MMDs are responding and happy. */
 164         while (mmd_mask) {
 165                 if (mmd_mask & 1) {
 166                         int fault_fatal = fatal_mask & 1;
 167                         if (efx_mdio_check_mmd(efx, mmd, fault_fatal))
 168                                 return -EIO;
 169                 }
 170                 mmd_mask = mmd_mask >> 1;
 171                 fatal_mask = fatal_mask >> 1;
 172                 mmd++;
 173         }
 174
 175         return 0;
 176 }
 177
 178 bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
 179 {
 180         /* If the port is in loopback, then we should only consider a subset
 181          * of mmd's */
 182         if (LOOPBACK_INTERNAL(efx))
 183                 return true;
 184         else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
 185                 return false;
 186         else if (efx_phy_mode_disabled(efx->phy_mode))
 187                 return false;
 188         else if (efx->loopback_mode == LOOPBACK_PHYXS)
 189                 mmd_mask &= ~(MDIO_DEVS_PHYXS |
 190                               MDIO_DEVS_PCS |
 191                               MDIO_DEVS_PMAPMD |
 192                               MDIO_DEVS_AN);
 193         else if (efx->loopback_mode == LOOPBACK_PCS)
 194                 mmd_mask &= ~(MDIO_DEVS_PCS |
 195                               MDIO_DEVS_PMAPMD |
 196                               MDIO_DEVS_AN);
 197         else if (efx->loopback_mode == LOOPBACK_PMAPMD)
 198                 mmd_mask &= ~(MDIO_DEVS_PMAPMD |
 199                               MDIO_DEVS_AN);
 200
 201         return mdio45_links_ok(&efx->mdio, mmd_mask);
 202 }
 203
 204 void efx_mdio_transmit_disable(struct efx_nic *efx)
 205 {
 206         efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
 207                           MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
 208                           efx->phy_mode & PHY_MODE_TX_DISABLED);
 209 }
 210
 211 void efx_mdio_phy_reconfigure(struct efx_nic *efx)
 212 {
 213         efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
 214                           MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
 215                           efx->loopback_mode == LOOPBACK_PMAPMD);
 216         efx_mdio_set_flag(efx, MDIO_MMD_PCS,
 217                           MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
 218                           efx->loopback_mode == LOOPBACK_PCS);
 219         efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
 220                           MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
 221                           efx->loopback_mode == LOOPBACK_PHYXS_WS);
 222 }
 223
 224 static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
 225                                     int lpower, int mmd)
 226 {
 227         int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
 228
 229         netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
 230                   mmd, lpower);
 231
 232         if (stat & MDIO_STAT1_LPOWERABLE) {
 233                 efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
 234                                   MDIO_CTRL1_LPOWER, lpower);
 235         }
 236 }
 237
 238 void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
 239                               int low_power, unsigned int mmd_mask)
 240 {
 241         int mmd = 0;
 242         mmd_mask &= ~MDIO_DEVS_AN;
 243         while (mmd_mask) {
 244                 if (mmd_mask & 1)
 245                         efx_mdio_set_mmd_lpower(efx, low_power, mmd);
 246                 mmd_mask = (mmd_mask >> 1);
 247                 mmd++;
 248         }
 249 }
 250
 251 /**
 252  * efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
 253  * @efx:                Efx NIC
 254  * @ecmd:               New settings
 255  */
 256 int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
 257 {
 258         struct ethtool_cmd prev;
 259
 260         efx->phy_op->get_settings(efx, &prev);
 261
 262         if (ecmd->advertising == prev.advertising &&
 263             ecmd->speed == prev.speed &&
 264             ecmd->duplex == prev.duplex &&
 265             ecmd->port == prev.port &&
 266             ecmd->autoneg == prev.autoneg)
 267                 return 0;
 268
 269         /* We can only change these settings for -T PHYs */
 270         if (prev.port != PORT_TP || ecmd->port != PORT_TP)
 271                 return -EINVAL;
 272
 273         /* Check that PHY supports these settings */
 274         if (!ecmd->autoneg ||
 275             (ecmd->advertising | SUPPORTED_Autoneg) & ~prev.supported)
 276                 return -EINVAL;
 277
 278         efx_link_set_advertising(efx, ecmd->advertising | ADVERTISED_Autoneg);
 279         efx_mdio_an_reconfigure(efx);
 280         return 0;
 281 }
 282
 283 /**
 284  * efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
 285  * @efx:                Efx NIC
 286  */
 287 void efx_mdio_an_reconfigure(struct efx_nic *efx)
 288 {
 289         int reg;
 290
 291         WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
 292
 293         /* Set up the base page */
 294         reg = ADVERTISE_CSMA | ADVERTISE_RESV;
 295         if (efx->link_advertising & ADVERTISED_Pause)
 296                 reg |= ADVERTISE_PAUSE_CAP;
 297         if (efx->link_advertising & ADVERTISED_Asym_Pause)
 298                 reg |= ADVERTISE_PAUSE_ASYM;
 299         efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
 300
 301         /* Set up the (extended) next page */
 302         efx->phy_op->set_npage_adv(efx, efx->link_advertising);
 303
 304         /* Enable and restart AN */
 305         reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
 306         reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
 307         efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
 308 }
 309
 310 enum efx_fc_type efx_mdio_get_pause(struct efx_nic *efx)
 311 {
 312         BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));
 313
 314         if (!(efx->wanted_fc & EFX_FC_AUTO))
 315                 return efx->wanted_fc;
 316
 317         WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
 318
 319         return mii_resolve_flowctrl_fdx(
 320                 mii_advertise_flowctrl(efx->wanted_fc),
 321                 efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
 322 }
 323
 324 int efx_mdio_test_alive(struct efx_nic *efx)
 325 {
 326         int rc;
 327         int devad = __ffs(efx->mdio.mmds);
 328         u16 physid1, physid2;
 329
 330         mutex_lock(&efx->mac_lock);
 331
 332         physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
 333         physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
 334
 335         if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
 336             (physid2 == 0x0000) || (physid2 == 0xffff)) {
 337                 netif_err(efx, hw, efx->net_dev,
 338                           "no MDIO PHY present with ID %d\n", efx->mdio.prtad);
 339                 rc = -EINVAL;
 340         } else {
 341                 rc = efx_mdio_check_mmds(efx, efx->mdio.mmds, 0);
 342         }
 343
 344         mutex_unlock(&efx->mac_lock);
 345         return rc;
 346 }