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 "falcon_hwdefs.h"
  16 #include "falcon_io.h"
  17 #include "mac.h"
  18 #include "mdio_10g.h"
  19 #include "phy.h"
  20 #include "boards.h"
  21 #include "workarounds.h"
  22
  23 /**************************************************************************
  24  *
  25  * MAC operations
  26  *
  27  *************************************************************************/
  28
  29 /* Configure the XAUI driver that is an output from Falcon */
  30 static void falcon_setup_xaui(struct efx_nic *efx)
  31 {
  32         efx_oword_t sdctl, txdrv;
  33
  34         /* Move the XAUI into low power, unless there is no PHY, in
  35          * which case the XAUI will have to drive a cable. */
  36         if (efx->phy_type == PHY_TYPE_NONE)
  37                 return;
  38
  39         falcon_read(efx, &sdctl, XX_SD_CTL_REG);
  40         EFX_SET_OWORD_FIELD(sdctl, XX_HIDRVD, XX_SD_CTL_DRV_DEFAULT);
  41         EFX_SET_OWORD_FIELD(sdctl, XX_LODRVD, XX_SD_CTL_DRV_DEFAULT);
  42         EFX_SET_OWORD_FIELD(sdctl, XX_HIDRVC, XX_SD_CTL_DRV_DEFAULT);
  43         EFX_SET_OWORD_FIELD(sdctl, XX_LODRVC, XX_SD_CTL_DRV_DEFAULT);
  44         EFX_SET_OWORD_FIELD(sdctl, XX_HIDRVB, XX_SD_CTL_DRV_DEFAULT);
  45         EFX_SET_OWORD_FIELD(sdctl, XX_LODRVB, XX_SD_CTL_DRV_DEFAULT);
  46         EFX_SET_OWORD_FIELD(sdctl, XX_HIDRVA, XX_SD_CTL_DRV_DEFAULT);
  47         EFX_SET_OWORD_FIELD(sdctl, XX_LODRVA, XX_SD_CTL_DRV_DEFAULT);
  48         falcon_write(efx, &sdctl, XX_SD_CTL_REG);
  49
  50         EFX_POPULATE_OWORD_8(txdrv,
  51                              XX_DEQD, XX_TXDRV_DEQ_DEFAULT,
  52                              XX_DEQC, XX_TXDRV_DEQ_DEFAULT,
  53                              XX_DEQB, XX_TXDRV_DEQ_DEFAULT,
  54                              XX_DEQA, XX_TXDRV_DEQ_DEFAULT,
  55                              XX_DTXD, XX_TXDRV_DTX_DEFAULT,
  56                              XX_DTXC, XX_TXDRV_DTX_DEFAULT,
  57                              XX_DTXB, XX_TXDRV_DTX_DEFAULT,
  58                              XX_DTXA, XX_TXDRV_DTX_DEFAULT);
  59         falcon_write(efx, &txdrv, XX_TXDRV_CTL_REG);
  60 }
  61
  62 int falcon_reset_xaui(struct efx_nic *efx)
  63 {
  64         efx_oword_t reg;
  65         int count;
  66
  67         EFX_POPULATE_DWORD_1(reg, XX_RST_XX_EN, 1);
  68         falcon_write(efx, &reg, XX_PWR_RST_REG);
  69
  70         /* Give some time for the link to establish */
  71         for (count = 0; count < 1000; count++) { /* wait upto 10ms */
  72                 falcon_read(efx, &reg, XX_PWR_RST_REG);
  73                 if (EFX_OWORD_FIELD(reg, XX_RST_XX_EN) == 0) {
  74                         falcon_setup_xaui(efx);
  75                         return 0;
  76                 }
  77                 udelay(10);
  78         }
  79         EFX_ERR(efx, "timed out waiting for XAUI/XGXS reset\n");
  80         return -ETIMEDOUT;
  81 }
  82
  83 static void falcon_mask_status_intr(struct efx_nic *efx, bool enable)
  84 {
  85         efx_oword_t reg;
  86
  87         if ((falcon_rev(efx) != FALCON_REV_B0) || LOOPBACK_INTERNAL(efx))
  88                 return;
  89
  90         /* We expect xgmii faults if the wireside link is up */
  91         if (!EFX_WORKAROUND_5147(efx) || !efx->link_up)
  92                 return;
  93
  94         /* We can only use this interrupt to signal the negative edge of
  95          * xaui_align [we have to poll the positive edge]. */
  96         if (!efx->mac_up)
  97                 return;
  98
  99         /* Flush the ISR */
 100         if (enable)
 101                 falcon_read(efx, &reg, XM_MGT_INT_REG_B0);
 102
 103         EFX_POPULATE_OWORD_2(reg,
 104                              XM_MSK_RMTFLT, !enable,
 105                              XM_MSK_LCLFLT, !enable);
 106         falcon_write(efx, &reg, XM_MGT_INT_MSK_REG_B0);
 107 }
 108
 109 /* Get status of XAUI link */
 110 bool falcon_xaui_link_ok(struct efx_nic *efx)
 111 {
 112         efx_oword_t reg;
 113         bool align_done, link_ok = false;
 114         int sync_status;
 115
 116         if (LOOPBACK_INTERNAL(efx))
 117                 return true;
 118
 119         /* Read link status */
 120         falcon_read(efx, &reg, XX_CORE_STAT_REG);
 121
 122         align_done = EFX_OWORD_FIELD(reg, XX_ALIGN_DONE);
 123         sync_status = EFX_OWORD_FIELD(reg, XX_SYNC_STAT);
 124         if (align_done && (sync_status == XX_SYNC_STAT_DECODE_SYNCED))
 125                 link_ok = true;
 126
 127         /* Clear link status ready for next read */
 128         EFX_SET_OWORD_FIELD(reg, XX_COMMA_DET, XX_COMMA_DET_RESET);
 129         EFX_SET_OWORD_FIELD(reg, XX_CHARERR, XX_CHARERR_RESET);
 130         EFX_SET_OWORD_FIELD(reg, XX_DISPERR, XX_DISPERR_RESET);
 131         falcon_write(efx, &reg, XX_CORE_STAT_REG);
 132
 133         /* If the link is up, then check the phy side of the xaui link */
 134         if (efx->link_up && link_ok)
 135                 if (efx->phy_op->mmds & (1 << MDIO_MMD_PHYXS))
 136                         link_ok = mdio_clause45_phyxgxs_lane_sync(efx);
 137
 138         return link_ok;
 139 }
 140
 141 static void falcon_reconfigure_xmac_core(struct efx_nic *efx)
 142 {
 143         unsigned int max_frame_len;
 144         efx_oword_t reg;
 145         bool rx_fc = !!(efx->link_fc & EFX_FC_RX);
 146
 147         /* Configure MAC  - cut-thru mode is hard wired on */
 148         EFX_POPULATE_DWORD_3(reg,
 149                              XM_RX_JUMBO_MODE, 1,
 150                              XM_TX_STAT_EN, 1,
 151                              XM_RX_STAT_EN, 1);
 152         falcon_write(efx, &reg, XM_GLB_CFG_REG);
 153
 154         /* Configure TX */
 155         EFX_POPULATE_DWORD_6(reg,
 156                              XM_TXEN, 1,
 157                              XM_TX_PRMBL, 1,
 158                              XM_AUTO_PAD, 1,
 159                              XM_TXCRC, 1,
 160                              XM_FCNTL, 1,
 161                              XM_IPG, 0x3);
 162         falcon_write(efx, &reg, XM_TX_CFG_REG);
 163
 164         /* Configure RX */
 165         EFX_POPULATE_DWORD_5(reg,
 166                              XM_RXEN, 1,
 167                              XM_AUTO_DEPAD, 0,
 168                              XM_ACPT_ALL_MCAST, 1,
 169                              XM_ACPT_ALL_UCAST, efx->promiscuous,
 170                              XM_PASS_CRC_ERR, 1);
 171         falcon_write(efx, &reg, XM_RX_CFG_REG);
 172
 173         /* Set frame length */
 174         max_frame_len = EFX_MAX_FRAME_LEN(efx->net_dev->mtu);
 175         EFX_POPULATE_DWORD_1(reg, XM_MAX_RX_FRM_SIZE, max_frame_len);
 176         falcon_write(efx, &reg, XM_RX_PARAM_REG);
 177         EFX_POPULATE_DWORD_2(reg,
 178                              XM_MAX_TX_FRM_SIZE, max_frame_len,
 179                              XM_TX_JUMBO_MODE, 1);
 180         falcon_write(efx, &reg, XM_TX_PARAM_REG);
 181
 182         EFX_POPULATE_DWORD_2(reg,
 183                              XM_PAUSE_TIME, 0xfffe, /* MAX PAUSE TIME */
 184                              XM_DIS_FCNTL, !rx_fc);
 185         falcon_write(efx, &reg, XM_FC_REG);
 186
 187         /* Set MAC address */
 188         EFX_POPULATE_DWORD_4(reg,
 189                              XM_ADR_0, efx->net_dev->dev_addr[0],
 190                              XM_ADR_1, efx->net_dev->dev_addr[1],
 191                              XM_ADR_2, efx->net_dev->dev_addr[2],
 192                              XM_ADR_3, efx->net_dev->dev_addr[3]);
 193         falcon_write(efx, &reg, XM_ADR_LO_REG);
 194         EFX_POPULATE_DWORD_2(reg,
 195                              XM_ADR_4, efx->net_dev->dev_addr[4],
 196                              XM_ADR_5, efx->net_dev->dev_addr[5]);
 197         falcon_write(efx, &reg, XM_ADR_HI_REG);
 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                 falcon_read(efx, &reg, XX_CORE_STAT_REG);
 214                 old_xgxs_loopback = EFX_OWORD_FIELD(reg, XX_XGXS_LB_EN);
 215                 old_xgmii_loopback = EFX_OWORD_FIELD(reg, XX_XGMII_LB_EN);
 216
 217                 falcon_read(efx, &reg, XX_SD_CTL_REG);
 218                 old_xaui_loopback = EFX_OWORD_FIELD(reg, XX_LPBKA);
 219
 220                 /* The PHY driver may have turned XAUI off */
 221                 reset_xgxs = ((xgxs_loopback != old_xgxs_loopback) ||
 222                               (xaui_loopback != old_xaui_loopback) ||
 223                               (xgmii_loopback != old_xgmii_loopback));
 224
 225                 if (reset_xgxs)
 226                         falcon_reset_xaui(efx);
 227         }
 228
 229         falcon_read(efx, &reg, XX_CORE_STAT_REG);
 230         EFX_SET_OWORD_FIELD(reg, XX_FORCE_SIG,
 231                             (xgxs_loopback || xaui_loopback) ?
 232                             XX_FORCE_SIG_DECODE_FORCED : 0);
 233         EFX_SET_OWORD_FIELD(reg, XX_XGXS_LB_EN, xgxs_loopback);
 234         EFX_SET_OWORD_FIELD(reg, XX_XGMII_LB_EN, xgmii_loopback);
 235         falcon_write(efx, &reg, XX_CORE_STAT_REG);
 236
 237         falcon_read(efx, &reg, XX_SD_CTL_REG);
 238         EFX_SET_OWORD_FIELD(reg, XX_LPBKD, xaui_loopback);
 239         EFX_SET_OWORD_FIELD(reg, XX_LPBKC, xaui_loopback);
 240         EFX_SET_OWORD_FIELD(reg, XX_LPBKB, xaui_loopback);
 241         EFX_SET_OWORD_FIELD(reg, XX_LPBKA, xaui_loopback);
 242         falcon_write(efx, &reg, XX_SD_CTL_REG);
 243 }
 244
 245
 246 /* Try and bring the Falcon side of the Falcon-Phy XAUI link fails
 247  * to come back up. Bash it until it comes back up */
 248 static void falcon_check_xaui_link_up(struct efx_nic *efx, int tries)
 249 {
 250         efx->mac_up = falcon_xaui_link_ok(efx);
 251
 252         if ((efx->loopback_mode == LOOPBACK_NETWORK) ||
 253             efx_phy_mode_disabled(efx->phy_mode))
 254                 /* XAUI link is expected to be down */
 255                 return;
 256
 257         while (!efx->mac_up && tries) {
 258                 EFX_LOG(efx, "bashing xaui\n");
 259                 falcon_reset_xaui(efx);
 260                 udelay(200);
 261
 262                 efx->mac_up = falcon_xaui_link_ok(efx);
 263                 --tries;
 264         }
 265 }
 266
 267 static void falcon_reconfigure_xmac(struct efx_nic *efx)
 268 {
 269         falcon_mask_status_intr(efx, false);
 270
 271         falcon_reconfigure_xgxs_core(efx);
 272         falcon_reconfigure_xmac_core(efx);
 273
 274         falcon_reconfigure_mac_wrapper(efx);
 275
 276         falcon_check_xaui_link_up(efx, 5);
 277         falcon_mask_status_intr(efx, true);
 278 }
 279
 280 static void falcon_update_stats_xmac(struct efx_nic *efx)
 281 {
 282         struct efx_mac_stats *mac_stats = &efx->mac_stats;
 283         int rc;
 284
 285         rc = falcon_dma_stats(efx, XgDmaDone_offset);
 286         if (rc)
 287                 return;
 288
 289         /* Update MAC stats from DMAed values */
 290         FALCON_STAT(efx, XgRxOctets, rx_bytes);
 291         FALCON_STAT(efx, XgRxOctetsOK, rx_good_bytes);
 292         FALCON_STAT(efx, XgRxPkts, rx_packets);
 293         FALCON_STAT(efx, XgRxPktsOK, rx_good);
 294         FALCON_STAT(efx, XgRxBroadcastPkts, rx_broadcast);
 295         FALCON_STAT(efx, XgRxMulticastPkts, rx_multicast);
 296         FALCON_STAT(efx, XgRxUnicastPkts, rx_unicast);
 297         FALCON_STAT(efx, XgRxUndersizePkts, rx_lt64);
 298         FALCON_STAT(efx, XgRxOversizePkts, rx_gtjumbo);
 299         FALCON_STAT(efx, XgRxJabberPkts, rx_bad_gtjumbo);
 300         FALCON_STAT(efx, XgRxUndersizeFCSerrorPkts, rx_bad_lt64);
 301         FALCON_STAT(efx, XgRxDropEvents, rx_overflow);
 302         FALCON_STAT(efx, XgRxFCSerrorPkts, rx_bad);
 303         FALCON_STAT(efx, XgRxAlignError, rx_align_error);
 304         FALCON_STAT(efx, XgRxSymbolError, rx_symbol_error);
 305         FALCON_STAT(efx, XgRxInternalMACError, rx_internal_error);
 306         FALCON_STAT(efx, XgRxControlPkts, rx_control);
 307         FALCON_STAT(efx, XgRxPausePkts, rx_pause);
 308         FALCON_STAT(efx, XgRxPkts64Octets, rx_64);
 309         FALCON_STAT(efx, XgRxPkts65to127Octets, rx_65_to_127);
 310         FALCON_STAT(efx, XgRxPkts128to255Octets, rx_128_to_255);
 311         FALCON_STAT(efx, XgRxPkts256to511Octets, rx_256_to_511);
 312         FALCON_STAT(efx, XgRxPkts512to1023Octets, rx_512_to_1023);
 313         FALCON_STAT(efx, XgRxPkts1024to15xxOctets, rx_1024_to_15xx);
 314         FALCON_STAT(efx, XgRxPkts15xxtoMaxOctets, rx_15xx_to_jumbo);
 315         FALCON_STAT(efx, XgRxLengthError, rx_length_error);
 316         FALCON_STAT(efx, XgTxPkts, tx_packets);
 317         FALCON_STAT(efx, XgTxOctets, tx_bytes);
 318         FALCON_STAT(efx, XgTxMulticastPkts, tx_multicast);
 319         FALCON_STAT(efx, XgTxBroadcastPkts, tx_broadcast);
 320         FALCON_STAT(efx, XgTxUnicastPkts, tx_unicast);
 321         FALCON_STAT(efx, XgTxControlPkts, tx_control);
 322         FALCON_STAT(efx, XgTxPausePkts, tx_pause);
 323         FALCON_STAT(efx, XgTxPkts64Octets, tx_64);
 324         FALCON_STAT(efx, XgTxPkts65to127Octets, tx_65_to_127);
 325         FALCON_STAT(efx, XgTxPkts128to255Octets, tx_128_to_255);
 326         FALCON_STAT(efx, XgTxPkts256to511Octets, tx_256_to_511);
 327         FALCON_STAT(efx, XgTxPkts512to1023Octets, tx_512_to_1023);
 328         FALCON_STAT(efx, XgTxPkts1024to15xxOctets, tx_1024_to_15xx);
 329         FALCON_STAT(efx, XgTxPkts1519toMaxOctets, tx_15xx_to_jumbo);
 330         FALCON_STAT(efx, XgTxUndersizePkts, tx_lt64);
 331         FALCON_STAT(efx, XgTxOversizePkts, tx_gtjumbo);
 332         FALCON_STAT(efx, XgTxNonTcpUdpPkt, tx_non_tcpudp);
 333         FALCON_STAT(efx, XgTxMacSrcErrPkt, tx_mac_src_error);
 334         FALCON_STAT(efx, XgTxIpSrcErrPkt, tx_ip_src_error);
 335
 336         /* Update derived statistics */
 337         mac_stats->tx_good_bytes =
 338                 (mac_stats->tx_bytes - mac_stats->tx_bad_bytes -
 339                  mac_stats->tx_control * 64);
 340         mac_stats->rx_bad_bytes =
 341                 (mac_stats->rx_bytes - mac_stats->rx_good_bytes -
 342                  mac_stats->rx_control * 64);
 343 }
 344
 345 static void falcon_xmac_irq(struct efx_nic *efx)
 346 {
 347         /* The XGMII link has a transient fault, which indicates either:
 348          *   - there's a transient xgmii fault
 349          *   - falcon's end of the xaui link may need a kick
 350          *   - the wire-side link may have gone down, but the lasi/poll()
 351          *     hasn't noticed yet.
 352          *
 353          * We only want to even bother polling XAUI if we're confident it's
 354          * not (1) or (3). In both cases, the only reliable way to spot this
 355          * is to wait a bit. We do this here by forcing the mac link state
 356          * to down, and waiting for the mac poll to come round and check
 357          */
 358         efx->mac_up = false;
 359 }
 360
 361 static void falcon_poll_xmac(struct efx_nic *efx)
 362 {
 363         if (!EFX_WORKAROUND_5147(efx) || !efx->link_up || efx->mac_up)
 364                 return;
 365
 366         falcon_mask_status_intr(efx, false);
 367         falcon_check_xaui_link_up(efx, 1);
 368         falcon_mask_status_intr(efx, true);
 369 }
 370
 371 struct efx_mac_operations falcon_xmac_operations = {
 372         .reconfigure    = falcon_reconfigure_xmac,
 373         .update_stats   = falcon_update_stats_xmac,
 374         .irq            = falcon_xmac_irq,
 375         .poll           = falcon_poll_xmac,
 376 };