drivers/net/ethernet/sfc/falcon_xmac.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2005-2006 Fen Systems Ltd.
   4  * Copyright 2006-2010 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 "nic.h"
  15 #include "regs.h"
  16 #include "io.h"
  17 #include "mac.h"
  18 #include "mdio_10g.h"
  19 #include "workarounds.h"
  20
  21 /**************************************************************************
  22  *
  23  * MAC operations
  24  *
  25  *************************************************************************/
  26
  27 /* Configure the XAUI driver that is an output from Falcon */
  28 void falcon_setup_xaui(struct efx_nic *efx)
  29 {
  30         efx_oword_t sdctl, txdrv;
  31
  32         /* Move the XAUI into low power, unless there is no PHY, in
  33          * which case the XAUI will have to drive a cable. */
  34         if (efx->phy_type == PHY_TYPE_NONE)
  35                 return;
  36
  37         efx_reado(efx, &sdctl, FR_AB_XX_SD_CTL);
  38         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVD, FFE_AB_XX_SD_CTL_DRV_DEF);
  39         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVD, FFE_AB_XX_SD_CTL_DRV_DEF);
  40         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVC, FFE_AB_XX_SD_CTL_DRV_DEF);
  41         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVC, FFE_AB_XX_SD_CTL_DRV_DEF);
  42         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVB, FFE_AB_XX_SD_CTL_DRV_DEF);
  43         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVB, FFE_AB_XX_SD_CTL_DRV_DEF);
  44         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVA, FFE_AB_XX_SD_CTL_DRV_DEF);
  45         EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVA, FFE_AB_XX_SD_CTL_DRV_DEF);
  46         efx_writeo(efx, &sdctl, FR_AB_XX_SD_CTL);
  47
  48         EFX_POPULATE_OWORD_8(txdrv,
  49                              FRF_AB_XX_DEQD, FFE_AB_XX_TXDRV_DEQ_DEF,
  50                              FRF_AB_XX_DEQC, FFE_AB_XX_TXDRV_DEQ_DEF,
  51                              FRF_AB_XX_DEQB, FFE_AB_XX_TXDRV_DEQ_DEF,
  52                              FRF_AB_XX_DEQA, FFE_AB_XX_TXDRV_DEQ_DEF,
  53                              FRF_AB_XX_DTXD, FFE_AB_XX_TXDRV_DTX_DEF,
  54                              FRF_AB_XX_DTXC, FFE_AB_XX_TXDRV_DTX_DEF,
  55                              FRF_AB_XX_DTXB, FFE_AB_XX_TXDRV_DTX_DEF,
  56                              FRF_AB_XX_DTXA, FFE_AB_XX_TXDRV_DTX_DEF);
  57         efx_writeo(efx, &txdrv, FR_AB_XX_TXDRV_CTL);
  58 }
  59
  60 int falcon_reset_xaui(struct efx_nic *efx)
  61 {
  62         struct falcon_nic_data *nic_data = efx->nic_data;
  63         efx_oword_t reg;
  64         int count;
  65
  66         /* Don't fetch MAC statistics over an XMAC reset */
  67         WARN_ON(nic_data->stats_disable_count == 0);
  68
  69         /* Start reset sequence */
  70         EFX_POPULATE_OWORD_1(reg, FRF_AB_XX_RST_XX_EN, 1);
  71         efx_writeo(efx, &reg, FR_AB_XX_PWR_RST);
  72
  73         /* Wait up to 10 ms for completion, then reinitialise */
  74         for (count = 0; count < 1000; count++) {
  75                 efx_reado(efx, &reg, FR_AB_XX_PWR_RST);
  76                 if (EFX_OWORD_FIELD(reg, FRF_AB_XX_RST_XX_EN) == 0 &&
  77                     EFX_OWORD_FIELD(reg, FRF_AB_XX_SD_RST_ACT) == 0) {
  78                         falcon_setup_xaui(efx);
  79                         return 0;
  80                 }
  81                 udelay(10);
  82         }
  83         netif_err(efx, hw, efx->net_dev,
  84                   "timed out waiting for XAUI/XGXS reset\n");
  85         return -ETIMEDOUT;
  86 }
  87
  88 static void falcon_ack_status_intr(struct efx_nic *efx)
  89 {
  90         struct falcon_nic_data *nic_data = efx->nic_data;
  91         efx_oword_t reg;
  92
  93         if ((efx_nic_rev(efx) != EFX_REV_FALCON_B0) || LOOPBACK_INTERNAL(efx))
  94                 return;
  95
  96         /* We expect xgmii faults if the wireside link is down */
  97         if (!EFX_WORKAROUND_5147(efx) || !efx->link_state.up)
  98                 return;
  99
 100         /* We can only use this interrupt to signal the negative edge of
 101          * xaui_align [we have to poll the positive edge]. */
 102         if (nic_data->xmac_poll_required)
 103                 return;
 104
 105         efx_reado(efx, &reg, FR_AB_XM_MGT_INT_MSK);
 106 }
 107
 108 static bool falcon_xgxs_link_ok(struct efx_nic *efx)
 109 {
 110         efx_oword_t reg;
 111         bool align_done, link_ok = false;
 112         int sync_status;
 113
 114         /* Read link status */
 115         efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
 116
 117         align_done = EFX_OWORD_FIELD(reg, FRF_AB_XX_ALIGN_DONE);
 118         sync_status = EFX_OWORD_FIELD(reg, FRF_AB_XX_SYNC_STAT);
 119         if (align_done && (sync_status == FFE_AB_XX_STAT_ALL_LANES))
 120                 link_ok = true;
 121
 122         /* Clear link status ready for next read */
 123         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_COMMA_DET, FFE_AB_XX_STAT_ALL_LANES);
 124         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_CHAR_ERR, FFE_AB_XX_STAT_ALL_LANES);
 125         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_DISPERR, FFE_AB_XX_STAT_ALL_LANES);
 126         efx_writeo(efx, &reg, FR_AB_XX_CORE_STAT);
 127
 128         return link_ok;
 129 }
 130
 131 static bool falcon_xmac_link_ok(struct efx_nic *efx)
 132 {
 133         /*
 134          * Check MAC's XGXS link status except when using XGMII loopback
 135          * which bypasses the XGXS block.
 136          * If possible, check PHY's XGXS link status except when using
 137          * MAC loopback.
 138          */
 139         return (efx->loopback_mode == LOOPBACK_XGMII ||
 140                 falcon_xgxs_link_ok(efx)) &&
 141                 (!(efx->mdio.mmds & (1 << MDIO_MMD_PHYXS)) ||
 142                  LOOPBACK_INTERNAL(efx) ||
 143                  efx_mdio_phyxgxs_lane_sync(efx));
 144 }
 145
 146 static void falcon_reconfigure_xmac_core(struct efx_nic *efx)
 147 {
 148         unsigned int max_frame_len;
 149         efx_oword_t reg;
 150         bool rx_fc = !!(efx->link_state.fc & EFX_FC_RX);
 151         bool tx_fc = !!(efx->link_state.fc & EFX_FC_TX);
 152
 153         /* Configure MAC  - cut-thru mode is hard wired on */
 154         EFX_POPULATE_OWORD_3(reg,
 155                              FRF_AB_XM_RX_JUMBO_MODE, 1,
 156                              FRF_AB_XM_TX_STAT_EN, 1,
 157                              FRF_AB_XM_RX_STAT_EN, 1);
 158         efx_writeo(efx, &reg, FR_AB_XM_GLB_CFG);
 159
 160         /* Configure TX */
 161         EFX_POPULATE_OWORD_6(reg,
 162                              FRF_AB_XM_TXEN, 1,
 163                              FRF_AB_XM_TX_PRMBL, 1,
 164                              FRF_AB_XM_AUTO_PAD, 1,
 165                              FRF_AB_XM_TXCRC, 1,
 166                              FRF_AB_XM_FCNTL, tx_fc,
 167                              FRF_AB_XM_IPG, 0x3);
 168         efx_writeo(efx, &reg, FR_AB_XM_TX_CFG);
 169
 170         /* Configure RX */
 171         EFX_POPULATE_OWORD_5(reg,
 172                              FRF_AB_XM_RXEN, 1,
 173                              FRF_AB_XM_AUTO_DEPAD, 0,
 174                              FRF_AB_XM_ACPT_ALL_MCAST, 1,
 175                              FRF_AB_XM_ACPT_ALL_UCAST, efx->promiscuous,
 176                              FRF_AB_XM_PASS_CRC_ERR, 1);
 177         efx_writeo(efx, &reg, FR_AB_XM_RX_CFG);
 178
 179         /* Set frame length */
 180         max_frame_len = EFX_MAX_FRAME_LEN(efx->net_dev->mtu);
 181         EFX_POPULATE_OWORD_1(reg, FRF_AB_XM_MAX_RX_FRM_SIZE, max_frame_len);
 182         efx_writeo(efx, &reg, FR_AB_XM_RX_PARAM);
 183         EFX_POPULATE_OWORD_2(reg,
 184                              FRF_AB_XM_MAX_TX_FRM_SIZE, max_frame_len,
 185                              FRF_AB_XM_TX_JUMBO_MODE, 1);
 186         efx_writeo(efx, &reg, FR_AB_XM_TX_PARAM);
 187
 188         EFX_POPULATE_OWORD_2(reg,
 189                              FRF_AB_XM_PAUSE_TIME, 0xfffe, /* MAX PAUSE TIME */
 190                              FRF_AB_XM_DIS_FCNTL, !rx_fc);
 191         efx_writeo(efx, &reg, FR_AB_XM_FC);
 192
 193         /* Set MAC address */
 194         memcpy(&reg, &efx->net_dev->dev_addr[0], 4);
 195         efx_writeo(efx, &reg, FR_AB_XM_ADR_LO);
 196         memcpy(&reg, &efx->net_dev->dev_addr[4], 2);
 197         efx_writeo(efx, &reg, FR_AB_XM_ADR_HI);
 198 }
 199
 200 static void falcon_reconfigure_xgxs_core(struct efx_nic *efx)
 201 {
 202         efx_oword_t reg;
 203         bool xgxs_loopback = (efx->loopback_mode == LOOPBACK_XGXS);
 204         bool xaui_loopback = (efx->loopback_mode == LOOPBACK_XAUI);
 205         bool xgmii_loopback = (efx->loopback_mode == LOOPBACK_XGMII);
 206
 207         /* XGXS block is flaky and will need to be reset if moving
 208          * into our out of XGMII, XGXS or XAUI loopbacks. */
 209         if (EFX_WORKAROUND_5147(efx)) {
 210                 bool old_xgmii_loopback, old_xgxs_loopback, old_xaui_loopback;
 211                 bool reset_xgxs;
 212
 213                 efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
 214                 old_xgxs_loopback = EFX_OWORD_FIELD(reg, FRF_AB_XX_XGXS_LB_EN);
 215                 old_xgmii_loopback =
 216                         EFX_OWORD_FIELD(reg, FRF_AB_XX_XGMII_LB_EN);
 217
 218                 efx_reado(efx, &reg, FR_AB_XX_SD_CTL);
 219                 old_xaui_loopback = EFX_OWORD_FIELD(reg, FRF_AB_XX_LPBKA);
 220
 221                 /* The PHY driver may have turned XAUI off */
 222                 reset_xgxs = ((xgxs_loopback != old_xgxs_loopback) ||
 223                               (xaui_loopback != old_xaui_loopback) ||
 224                               (xgmii_loopback != old_xgmii_loopback));
 225
 226                 if (reset_xgxs)
 227                         falcon_reset_xaui(efx);
 228         }
 229
 230         efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
 231         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_FORCE_SIG,
 232                             (xgxs_loopback || xaui_loopback) ?
 233                             FFE_AB_XX_FORCE_SIG_ALL_LANES : 0);
 234         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_XGXS_LB_EN, xgxs_loopback);
 235         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_XGMII_LB_EN, xgmii_loopback);
 236         efx_writeo(efx, &reg, FR_AB_XX_CORE_STAT);
 237
 238         efx_reado(efx, &reg, FR_AB_XX_SD_CTL);
 239         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKD, xaui_loopback);
 240         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKC, xaui_loopback);
 241         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKB, xaui_loopback);
 242         EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKA, xaui_loopback);
 243         efx_writeo(efx, &reg, FR_AB_XX_SD_CTL);
 244 }
 245
 246
 247 /* Try to bring up the Falcon side of the Falcon-Phy XAUI link */
 248 static bool falcon_xmac_link_ok_retry(struct efx_nic *efx, int tries)
 249 {
 250         bool mac_up = falcon_xmac_link_ok(efx);
 251
 252         if (LOOPBACK_MASK(efx) & LOOPBACKS_EXTERNAL(efx) & LOOPBACKS_WS ||
 253             efx_phy_mode_disabled(efx->phy_mode))
 254                 /* XAUI link is expected to be down */
 255                 return mac_up;
 256
 257         falcon_stop_nic_stats(efx);
 258
 259         while (!mac_up && tries) {
 260                 netif_dbg(efx, hw, efx->net_dev, "bashing xaui\n");
 261                 falcon_reset_xaui(efx);
 262                 udelay(200);
 263
 264                 mac_up = falcon_xmac_link_ok(efx);
 265                 --tries;
 266         }
 267
 268         falcon_start_nic_stats(efx);
 269
 270         return mac_up;
 271 }
 272
 273 static bool falcon_xmac_check_fault(struct efx_nic *efx)
 274 {
 275         return !falcon_xmac_link_ok_retry(efx, 5);
 276 }
 277
 278 static int falcon_reconfigure_xmac(struct efx_nic *efx)
 279 {
 280         struct falcon_nic_data *nic_data = efx->nic_data;
 281
 282         falcon_reconfigure_xgxs_core(efx);
 283         falcon_reconfigure_xmac_core(efx);
 284
 285         falcon_reconfigure_mac_wrapper(efx);
 286
 287         nic_data->xmac_poll_required = !falcon_xmac_link_ok_retry(efx, 5);
 288         falcon_ack_status_intr(efx);
 289
 290         return 0;
 291 }
 292
 293 static void falcon_update_stats_xmac(struct efx_nic *efx)
 294 {
 295         struct efx_mac_stats *mac_stats = &efx->mac_stats;
 296
 297         /* Update MAC stats from DMAed values */
 298         FALCON_STAT(efx, XgRxOctets, rx_bytes);
 299         FALCON_STAT(efx, XgRxOctetsOK, rx_good_bytes);
 300         FALCON_STAT(efx, XgRxPkts, rx_packets);
 301         FALCON_STAT(efx, XgRxPktsOK, rx_good);
 302         FALCON_STAT(efx, XgRxBroadcastPkts, rx_broadcast);
 303         FALCON_STAT(efx, XgRxMulticastPkts, rx_multicast);
 304         FALCON_STAT(efx, XgRxUnicastPkts, rx_unicast);
 305         FALCON_STAT(efx, XgRxUndersizePkts, rx_lt64);
 306         FALCON_STAT(efx, XgRxOversizePkts, rx_gtjumbo);
 307         FALCON_STAT(efx, XgRxJabberPkts, rx_bad_gtjumbo);
 308         FALCON_STAT(efx, XgRxUndersizeFCSerrorPkts, rx_bad_lt64);
 309         FALCON_STAT(efx, XgRxDropEvents, rx_overflow);
 310         FALCON_STAT(efx, XgRxFCSerrorPkts, rx_bad);
 311         FALCON_STAT(efx, XgRxAlignError, rx_align_error);
 312         FALCON_STAT(efx, XgRxSymbolError, rx_symbol_error);
 313         FALCON_STAT(efx, XgRxInternalMACError, rx_internal_error);
 314         FALCON_STAT(efx, XgRxControlPkts, rx_control);
 315         FALCON_STAT(efx, XgRxPausePkts, rx_pause);
 316         FALCON_STAT(efx, XgRxPkts64Octets, rx_64);
 317         FALCON_STAT(efx, XgRxPkts65to127Octets, rx_65_to_127);
 318         FALCON_STAT(efx, XgRxPkts128to255Octets, rx_128_to_255);
 319         FALCON_STAT(efx, XgRxPkts256to511Octets, rx_256_to_511);
 320         FALCON_STAT(efx, XgRxPkts512to1023Octets, rx_512_to_1023);
 321         FALCON_STAT(efx, XgRxPkts1024to15xxOctets, rx_1024_to_15xx);
 322         FALCON_STAT(efx, XgRxPkts15xxtoMaxOctets, rx_15xx_to_jumbo);
 323         FALCON_STAT(efx, XgRxLengthError, rx_length_error);
 324         FALCON_STAT(efx, XgTxPkts, tx_packets);
 325         FALCON_STAT(efx, XgTxOctets, tx_bytes);
 326         FALCON_STAT(efx, XgTxMulticastPkts, tx_multicast);
 327         FALCON_STAT(efx, XgTxBroadcastPkts, tx_broadcast);
 328         FALCON_STAT(efx, XgTxUnicastPkts, tx_unicast);
 329         FALCON_STAT(efx, XgTxControlPkts, tx_control);
 330         FALCON_STAT(efx, XgTxPausePkts, tx_pause);
 331         FALCON_STAT(efx, XgTxPkts64Octets, tx_64);
 332         FALCON_STAT(efx, XgTxPkts65to127Octets, tx_65_to_127);
 333         FALCON_STAT(efx, XgTxPkts128to255Octets, tx_128_to_255);
 334         FALCON_STAT(efx, XgTxPkts256to511Octets, tx_256_to_511);
 335         FALCON_STAT(efx, XgTxPkts512to1023Octets, tx_512_to_1023);
 336         FALCON_STAT(efx, XgTxPkts1024to15xxOctets, tx_1024_to_15xx);
 337         FALCON_STAT(efx, XgTxPkts1519toMaxOctets, tx_15xx_to_jumbo);
 338         FALCON_STAT(efx, XgTxUndersizePkts, tx_lt64);
 339         FALCON_STAT(efx, XgTxOversizePkts, tx_gtjumbo);
 340         FALCON_STAT(efx, XgTxNonTcpUdpPkt, tx_non_tcpudp);
 341         FALCON_STAT(efx, XgTxMacSrcErrPkt, tx_mac_src_error);
 342         FALCON_STAT(efx, XgTxIpSrcErrPkt, tx_ip_src_error);
 343
 344         /* Update derived statistics */
 345         mac_stats->tx_good_bytes =
 346                 (mac_stats->tx_bytes - mac_stats->tx_bad_bytes -
 347                  mac_stats->tx_control * 64);
 348         mac_stats->rx_bad_bytes =
 349                 (mac_stats->rx_bytes - mac_stats->rx_good_bytes -
 350                  mac_stats->rx_control * 64);
 351 }
 352
 353 void falcon_poll_xmac(struct efx_nic *efx)
 354 {
 355         struct falcon_nic_data *nic_data = efx->nic_data;
 356
 357         if (!EFX_WORKAROUND_5147(efx) || !efx->link_state.up ||
 358             !nic_data->xmac_poll_required)
 359                 return;
 360
 361         nic_data->xmac_poll_required = !falcon_xmac_link_ok_retry(efx, 1);
 362         falcon_ack_status_intr(efx);
 363 }
 364
 365 const struct efx_mac_operations falcon_xmac_operations = {
 366         .reconfigure    = falcon_reconfigure_xmac,
 367         .update_stats   = falcon_update_stats_xmac,
 368         .check_fault    = falcon_xmac_check_fault,
 369 };