drivers/net/sfc/falcon_xmac.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2005-2006 Fen Systems Ltd.
   4  * Copyright 2006-2008 Solarflare Communications Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation, incorporated herein by reference.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include "net_driver.h"
  13 #include "efx.h"
  14 #include "falcon.h"
  15 #include "regs.h"
  16 #include "io.h"
  17 #include "mac.h"
  18 #include "mdio_10g.h"
  19 #include "phy.h"
  20 #include "workarounds.h"
  21
  22 /**************************************************************************
  23  *
  24  * MAC operations
  25  *
  26  *************************************************************************/
  27
  28 /* Configure the XAUI driver that is an output from Falcon */
  29 static void falcon_setup_xaui(struct efx_nic *efx)
  30 {
  31         efx_oword_t sdctl, txdrv;
  32
  33         /* Move the XAUI into low power, unless there is no PHY, in
  34          * which case the XAUI will have to drive a cable. */
  35         if (efx->phy_type == PHY_TYPE_NONE)
  36                 return;
  37
  38         efx_reado(efx, &sdctl, FR_AB_XX_SD_CTL);
  39         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVD, FFE_AB_XX_SD_CTL_DRV_DEF);
  40         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVD, FFE_AB_XX_SD_CTL_DRV_DEF);
  41         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVC, FFE_AB_XX_SD_CTL_DRV_DEF);
  42         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVC, FFE_AB_XX_SD_CTL_DRV_DEF);
  43         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVB, FFE_AB_XX_SD_CTL_DRV_DEF);
  44         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVB, FFE_AB_XX_SD_CTL_DRV_DEF);
  45         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVA, FFE_AB_XX_SD_CTL_DRV_DEF);
  46         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVA, FFE_AB_XX_SD_CTL_DRV_DEF);
  47         efx_writeo(efx, &sdctl, FR_AB_XX_SD_CTL);
  48
  49         EFX_POPULATE_OWORD_8(txdrv,
  50                              FRF_AB_XX_DEQD, FFE_AB_XX_TXDRV_DEQ_DEF,
  51                              FRF_AB_XX_DEQC, FFE_AB_XX_TXDRV_DEQ_DEF,
  52                              FRF_AB_XX_DEQB, FFE_AB_XX_TXDRV_DEQ_DEF,
  53                              FRF_AB_XX_DEQA, FFE_AB_XX_TXDRV_DEQ_DEF,
  54                              FRF_AB_XX_DTXD, FFE_AB_XX_TXDRV_DTX_DEF,
  55                              FRF_AB_XX_DTXC, FFE_AB_XX_TXDRV_DTX_DEF,
  56                              FRF_AB_XX_DTXB, FFE_AB_XX_TXDRV_DTX_DEF,
  57                              FRF_AB_XX_DTXA, FFE_AB_XX_TXDRV_DTX_DEF);
  58         efx_writeo(efx, &txdrv, FR_AB_XX_TXDRV_CTL);
  59 }
  60
  61 int falcon_reset_xaui(struct efx_nic *efx)
  62 {
  63         efx_oword_t reg;
  64         int count;
  65
  66         /* Start reset sequence */
  67         EFX_POPULATE_DWORD_1(reg, FRF_AB_XX_RST_XX_EN, 1);
  68         efx_writeo(efx, &reg, FR_AB_XX_PWR_RST);
  69
  70         /* Wait up to 10 ms for completion, then reinitialise */
  71         for (count = 0; count < 1000; count++) {
  72                 efx_reado(efx, &reg, FR_AB_XX_PWR_RST);
  73                 if (EFX_OWORD_FIELD(reg, FRF_AB_XX_RST_XX_EN) == 0 &&
  74                     EFX_OWORD_FIELD(reg, FRF_AB_XX_SD_RST_ACT) == 0) {
  75                         falcon_setup_xaui(efx);
  76                         return 0;
  77                 }
  78                 udelay(10);
  79         }
  80         EFX_ERR(efx, "timed out waiting for XAUI/XGXS reset\n");
  81         return -ETIMEDOUT;
  82 }
  83
  84 static void falcon_mask_status_intr(struct efx_nic *efx, bool enable)
  85 {
  86         efx_oword_t reg;
  87
  88         if ((falcon_rev(efx) != FALCON_REV_B0) || LOOPBACK_INTERNAL(efx))
  89                 return;
  90
  91         /* We expect xgmii faults if the wireside link is up */
  92         if (!EFX_WORKAROUND_5147(efx) || !efx->link_up)
  93                 return;
  94
  95         /* We can only use this interrupt to signal the negative edge of
  96          * xaui_align [we have to poll the positive edge]. */
  97         if (!efx->mac_up)
  98                 return;
  99
 100         /* Flush the ISR */
 101         if (enable)
 102                 efx_reado(efx, &reg, FR_AB_XM_MGT_INT_MSK);
 103
 104         EFX_POPULATE_OWORD_2(reg,
 105                              FRF_AB_XM_MSK_RMTFLT, !enable,
 106                              FRF_AB_XM_MSK_LCLFLT, !enable);
 107         efx_writeo(efx, &reg, FR_AB_XM_MGT_INT_MASK);
 108 }
 109
 110 /* Get status of XAUI link */
 111 bool falcon_xaui_link_ok(struct efx_nic *efx)
 112 {
 113         efx_oword_t reg;
 114         bool align_done, link_ok = false;
 115         int sync_status;
 116
 117         if (LOOPBACK_INTERNAL(efx))
 118                 return true;
 119
 120         /* Read link status */
 121         efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
 122
 123         align_done = EFX_OWORD_FIELD(reg, FRF_AB_XX_ALIGN_DONE);
 124         sync_status = EFX_OWORD_FIELD(reg, FRF_AB_XX_SYNC_STAT);
 125         if (align_done && (sync_status == FFE_AB_XX_STAT_ALL_LANES))
 126                 link_ok = true;
 127
 128         /* Clear link status ready for next read */
 129         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_COMMA_DET, FFE_AB_XX_STAT_ALL_LANES);
 130         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_CHAR_ERR, FFE_AB_XX_STAT_ALL_LANES);
 131         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_DISPERR, FFE_AB_XX_STAT_ALL_LANES);
 132         efx_writeo(efx, &reg, FR_AB_XX_CORE_STAT);
 133
 134         /* If the link is up, then check the phy side of the xaui link */
 135         if (efx->link_up && link_ok)
 136                 if (efx->phy_op->mmds & (1 << MDIO_MMD_PHYXS))
 137                         link_ok = efx_mdio_phyxgxs_lane_sync(efx);
 138
 139         return link_ok;
 140 }
 141
 142 static void falcon_reconfigure_xmac_core(struct efx_nic *efx)
 143 {
 144         unsigned int max_frame_len;
 145         efx_oword_t reg;
 146         bool rx_fc = !!(efx->link_fc & EFX_FC_RX);
 147
 148         /* Configure MAC  - cut-thru mode is hard wired on */
 149         EFX_POPULATE_DWORD_3(reg,
 150                              FRF_AB_XM_RX_JUMBO_MODE, 1,
 151                              FRF_AB_XM_TX_STAT_EN, 1,
 152                              FRF_AB_XM_RX_STAT_EN, 1);
 153         efx_writeo(efx, &reg, FR_AB_XM_GLB_CFG);
 154
 155         /* Configure TX */
 156         EFX_POPULATE_DWORD_6(reg,
 157                              FRF_AB_XM_TXEN, 1,
 158                              FRF_AB_XM_TX_PRMBL, 1,
 159                              FRF_AB_XM_AUTO_PAD, 1,
 160                              FRF_AB_XM_TXCRC, 1,
 161                              FRF_AB_XM_FCNTL, 1,
 162                              FRF_AB_XM_IPG, 0x3);
 163         efx_writeo(efx, &reg, FR_AB_XM_TX_CFG);
 164
 165         /* Configure RX */
 166         EFX_POPULATE_DWORD_5(reg,
 167                              FRF_AB_XM_RXEN, 1,
 168                              FRF_AB_XM_AUTO_DEPAD, 0,
 169                              FRF_AB_XM_ACPT_ALL_MCAST, 1,
 170                              FRF_AB_XM_ACPT_ALL_UCAST, efx->promiscuous,
 171                              FRF_AB_XM_PASS_CRC_ERR, 1);
 172         efx_writeo(efx, &reg, FR_AB_XM_RX_CFG);
 173
 174         /* Set frame length */
 175         max_frame_len = EFX_MAX_FRAME_LEN(efx->net_dev->mtu);
 176         EFX_POPULATE_DWORD_1(reg, FRF_AB_XM_MAX_RX_FRM_SIZE, max_frame_len);
 177         efx_writeo(efx, &reg, FR_AB_XM_RX_PARAM);
 178         EFX_POPULATE_DWORD_2(reg,
 179                              FRF_AB_XM_MAX_TX_FRM_SIZE, max_frame_len,
 180                              FRF_AB_XM_TX_JUMBO_MODE, 1);
 181         efx_writeo(efx, &reg, FR_AB_XM_TX_PARAM);
 182
 183         EFX_POPULATE_DWORD_2(reg,
 184                              FRF_AB_XM_PAUSE_TIME, 0xfffe, /* MAX PAUSE TIME */
 185                              FRF_AB_XM_DIS_FCNTL, !rx_fc);
 186         efx_writeo(efx, &reg, FR_AB_XM_FC);
 187
 188         /* Set MAC address */
 189         memcpy(&reg, &efx->net_dev->dev_addr[0], 4);
 190         efx_writeo(efx, &reg, FR_AB_XM_ADR_LO);
 191         memcpy(&reg, &efx->net_dev->dev_addr[4], 2);
 192         efx_writeo(efx, &reg, FR_AB_XM_ADR_HI);
 193 }
 194
 195 static void falcon_reconfigure_xgxs_core(struct efx_nic *efx)
 196 {
 197         efx_oword_t reg;
 198         bool xgxs_loopback = (efx->loopback_mode == LOOPBACK_XGXS);
 199         bool xaui_loopback = (efx->loopback_mode == LOOPBACK_XAUI);
 200         bool xgmii_loopback = (efx->loopback_mode == LOOPBACK_XGMII);
 201
 202         /* XGXS block is flaky and will need to be reset if moving
 203          * into our out of XGMII, XGXS or XAUI loopbacks. */
 204         if (EFX_WORKAROUND_5147(efx)) {
 205                 bool old_xgmii_loopback, old_xgxs_loopback, old_xaui_loopback;
 206                 bool reset_xgxs;
 207
 208                 efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
 209                 old_xgxs_loopback = EFX_OWORD_FIELD(reg, FRF_AB_XX_XGXS_LB_EN);
 210                 old_xgmii_loopback =
 211                         EFX_OWORD_FIELD(reg, FRF_AB_XX_XGMII_LB_EN);
 212
 213                 efx_reado(efx, &reg, FR_AB_XX_SD_CTL);
 214                 old_xaui_loopback = EFX_OWORD_FIELD(reg, FRF_AB_XX_LPBKA);
 215
 216                 /* The PHY driver may have turned XAUI off */
 217                 reset_xgxs = ((xgxs_loopback != old_xgxs_loopback) ||
 218                               (xaui_loopback != old_xaui_loopback) ||
 219                               (xgmii_loopback != old_xgmii_loopback));
 220
 221                 if (reset_xgxs)
 222                         falcon_reset_xaui(efx);
 223         }
 224
 225         efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
 226         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_FORCE_SIG,
 227                             (xgxs_loopback || xaui_loopback) ?
 228                             FFE_AB_XX_FORCE_SIG_ALL_LANES : 0);
 229         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_XGXS_LB_EN, xgxs_loopback);
 230         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_XGMII_LB_EN, xgmii_loopback);
 231         efx_writeo(efx, &reg, FR_AB_XX_CORE_STAT);
 232
 233         efx_reado(efx, &reg, FR_AB_XX_SD_CTL);
 234         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKD, xaui_loopback);
 235         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKC, xaui_loopback);
 236         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKB, xaui_loopback);
 237         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKA, xaui_loopback);
 238         efx_writeo(efx, &reg, FR_AB_XX_SD_CTL);
 239 }
 240
 241
 242 /* Try and bring the Falcon side of the Falcon-Phy XAUI link fails
 243  * to come back up. Bash it until it comes back up */
 244 static void falcon_check_xaui_link_up(struct efx_nic *efx, int tries)
 245 {
 246         efx->mac_up = falcon_xaui_link_ok(efx);
 247
 248         if ((efx->loopback_mode == LOOPBACK_NETWORK) ||
 249             efx_phy_mode_disabled(efx->phy_mode))
 250                 /* XAUI link is expected to be down */
 251                 return;
 252
 253         while (!efx->mac_up && tries) {
 254                 EFX_LOG(efx, "bashing xaui\n");
 255                 falcon_reset_xaui(efx);
 256                 udelay(200);
 257
 258                 efx->mac_up = falcon_xaui_link_ok(efx);
 259                 --tries;
 260         }
 261 }
 262
 263 static void falcon_reconfigure_xmac(struct efx_nic *efx)
 264 {
 265         falcon_mask_status_intr(efx, false);
 266
 267         falcon_reconfigure_xgxs_core(efx);
 268         falcon_reconfigure_xmac_core(efx);
 269
 270         falcon_reconfigure_mac_wrapper(efx);
 271
 272         falcon_check_xaui_link_up(efx, 5);
 273         falcon_mask_status_intr(efx, true);
 274 }
 275
 276 static void falcon_update_stats_xmac(struct efx_nic *efx)
 277 {
 278         struct efx_mac_stats *mac_stats = &efx->mac_stats;
 279         int rc;
 280
 281         rc = falcon_dma_stats(efx, XgDmaDone_offset);
 282         if (rc)
 283                 return;
 284
 285         /* Update MAC stats from DMAed values */
 286         FALCON_STAT(efx, XgRxOctets, rx_bytes);
 287         FALCON_STAT(efx, XgRxOctetsOK, rx_good_bytes);
 288         FALCON_STAT(efx, XgRxPkts, rx_packets);
 289         FALCON_STAT(efx, XgRxPktsOK, rx_good);
 290         FALCON_STAT(efx, XgRxBroadcastPkts, rx_broadcast);
 291         FALCON_STAT(efx, XgRxMulticastPkts, rx_multicast);
 292         FALCON_STAT(efx, XgRxUnicastPkts, rx_unicast);
 293         FALCON_STAT(efx, XgRxUndersizePkts, rx_lt64);
 294         FALCON_STAT(efx, XgRxOversizePkts, rx_gtjumbo);
 295         FALCON_STAT(efx, XgRxJabberPkts, rx_bad_gtjumbo);
 296         FALCON_STAT(efx, XgRxUndersizeFCSerrorPkts, rx_bad_lt64);
 297         FALCON_STAT(efx, XgRxDropEvents, rx_overflow);
 298         FALCON_STAT(efx, XgRxFCSerrorPkts, rx_bad);
 299         FALCON_STAT(efx, XgRxAlignError, rx_align_error);
 300         FALCON_STAT(efx, XgRxSymbolError, rx_symbol_error);
 301         FALCON_STAT(efx, XgRxInternalMACError, rx_internal_error);
 302         FALCON_STAT(efx, XgRxControlPkts, rx_control);
 303         FALCON_STAT(efx, XgRxPausePkts, rx_pause);
 304         FALCON_STAT(efx, XgRxPkts64Octets, rx_64);
 305         FALCON_STAT(efx, XgRxPkts65to127Octets, rx_65_to_127);
 306         FALCON_STAT(efx, XgRxPkts128to255Octets, rx_128_to_255);
 307         FALCON_STAT(efx, XgRxPkts256to511Octets, rx_256_to_511);
 308         FALCON_STAT(efx, XgRxPkts512to1023Octets, rx_512_to_1023);
 309         FALCON_STAT(efx, XgRxPkts1024to15xxOctets, rx_1024_to_15xx);
 310         FALCON_STAT(efx, XgRxPkts15xxtoMaxOctets, rx_15xx_to_jumbo);
 311         FALCON_STAT(efx, XgRxLengthError, rx_length_error);
 312         FALCON_STAT(efx, XgTxPkts, tx_packets);
 313         FALCON_STAT(efx, XgTxOctets, tx_bytes);
 314         FALCON_STAT(efx, XgTxMulticastPkts, tx_multicast);
 315         FALCON_STAT(efx, XgTxBroadcastPkts, tx_broadcast);
 316         FALCON_STAT(efx, XgTxUnicastPkts, tx_unicast);
 317         FALCON_STAT(efx, XgTxControlPkts, tx_control);
 318         FALCON_STAT(efx, XgTxPausePkts, tx_pause);
 319         FALCON_STAT(efx, XgTxPkts64Octets, tx_64);
 320         FALCON_STAT(efx, XgTxPkts65to127Octets, tx_65_to_127);
 321         FALCON_STAT(efx, XgTxPkts128to255Octets, tx_128_to_255);
 322         FALCON_STAT(efx, XgTxPkts256to511Octets, tx_256_to_511);
 323         FALCON_STAT(efx, XgTxPkts512to1023Octets, tx_512_to_1023);
 324         FALCON_STAT(efx, XgTxPkts1024to15xxOctets, tx_1024_to_15xx);
 325         FALCON_STAT(efx, XgTxPkts1519toMaxOctets, tx_15xx_to_jumbo);
 326         FALCON_STAT(efx, XgTxUndersizePkts, tx_lt64);
 327         FALCON_STAT(efx, XgTxOversizePkts, tx_gtjumbo);
 328         FALCON_STAT(efx, XgTxNonTcpUdpPkt, tx_non_tcpudp);
 329         FALCON_STAT(efx, XgTxMacSrcErrPkt, tx_mac_src_error);
 330         FALCON_STAT(efx, XgTxIpSrcErrPkt, tx_ip_src_error);
 331
 332         /* Update derived statistics */
 333         mac_stats->tx_good_bytes =
 334                 (mac_stats->tx_bytes - mac_stats->tx_bad_bytes -
 335                  mac_stats->tx_control * 64);
 336         mac_stats->rx_bad_bytes =
 337                 (mac_stats->rx_bytes - mac_stats->rx_good_bytes -
 338                  mac_stats->rx_control * 64);
 339 }
 340
 341 static void falcon_xmac_irq(struct efx_nic *efx)
 342 {
 343         /* The XGMII link has a transient fault, which indicates either:
 344          *   - there's a transient xgmii fault
 345          *   - falcon's end of the xaui link may need a kick
 346          *   - the wire-side link may have gone down, but the lasi/poll()
 347          *     hasn't noticed yet.
 348          *
 349          * We only want to even bother polling XAUI if we're confident it's
 350          * not (1) or (3). In both cases, the only reliable way to spot this
 351          * is to wait a bit. We do this here by forcing the mac link state
 352          * to down, and waiting for the mac poll to come round and check
 353          */
 354         efx->mac_up = false;
 355 }
 356
 357 static void falcon_poll_xmac(struct efx_nic *efx)
 358 {
 359         if (!EFX_WORKAROUND_5147(efx) || !efx->link_up || efx->mac_up)
 360                 return;
 361
 362         falcon_mask_status_intr(efx, false);
 363         falcon_check_xaui_link_up(efx, 1);
 364         falcon_mask_status_intr(efx, true);
 365 }
 366
 367 struct efx_mac_operations falcon_xmac_operations = {
 368         .reconfigure    = falcon_reconfigure_xmac,
 369         .update_stats   = falcon_update_stats_xmac,
 370         .irq            = falcon_xmac_irq,
 371         .poll           = falcon_poll_xmac,
 372 };