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