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