drivers/net/ethernet/sfc/mdio_10g.c

   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
  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)
  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
  75 int 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
 116 int 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
 155 bool 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
 181 void 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
 188 void 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
 201 static 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
 215 void 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  */
 233 int 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  */
 264 void 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
 287 u8 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
 301 int 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 }