[netdrvr] sfc: sfc: Add self-test support

Add a set of self-tests accessible thorugh ethtool.
Add hardware loopback and TX disable control code to support them.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/drivers/net/sfc/tenxpress.c b/drivers/net/sfc/tenxpress.c
index d8df031c711d..b1cd6deec01f 100644
--- a/drivers/net/sfc/tenxpress.c
+++ b/drivers/net/sfc/tenxpress.c
@@ -24,6 +24,11 @@
                                  MDIO_MMDREG_DEVS0_PCS    | \
                                  MDIO_MMDREG_DEVS0_PHYXS)
 
+#define TENXPRESS_LOOPBACKS ((1 << LOOPBACK_PHYXS) |    \
+                             (1 << LOOPBACK_PCS) |      \
+                             (1 << LOOPBACK_PMAPMD) |   \
+                             (1 << LOOPBACK_NETWORK))
+
 /* We complain if we fail to see the link partner as 10G capable this many
  * times in a row (must be > 1 as sampling the autoneg. registers is racy)
  */
@@ -72,6 +77,10 @@
 #define PMA_PMD_BIST_RXD_LBN    (1)
 #define PMA_PMD_BIST_AFE_LBN    (0)
 
+/* Special Software reset register */
+#define PMA_PMD_EXT_CTRL_REG 49152
+#define PMA_PMD_EXT_SSR_LBN 15
+
 #define BIST_MAX_DELAY  (1000)
 #define BIST_POLL_DELAY (10)
 
@@ -86,6 +95,11 @@
 #define PCS_TEST_SELECT_REG 0xd807      /* PRM 10.5.8 */
 #define CLK312_EN_LBN 3
 
+/* PHYXS registers */
+#define PHYXS_TEST1         (49162)
+#define LOOPBACK_NEAR_LBN   (8)
+#define LOOPBACK_NEAR_WIDTH (1)
+
 /* Boot status register */
 #define PCS_BOOT_STATUS_REG     (0xd000)
 #define PCS_BOOT_FATAL_ERR_LBN  (0)
@@ -106,7 +120,9 @@ MODULE_PARM_DESC(crc_error_reset_threshold,
 
 struct tenxpress_phy_data {
         enum tenxpress_state state;
+        enum efx_loopback_mode loopback_mode;
         atomic_t bad_crc_count;
+        int tx_disabled;
         int bad_lp_tries;
 };
 
@@ -227,6 +243,35 @@ static int tenxpress_phy_init(struct efx_nic *efx)
         return rc;
 }
 
+static int tenxpress_special_reset(struct efx_nic *efx)
+{
+        int rc, reg;
+
+        EFX_TRACE(efx, "%s\n", __func__);
+
+        /* Initiate reset */
+        reg = mdio_clause45_read(efx, efx->mii.phy_id,
+                                 MDIO_MMD_PMAPMD, PMA_PMD_EXT_CTRL_REG);
+        reg |= (1 << PMA_PMD_EXT_SSR_LBN);
+        mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
+                            PMA_PMD_EXT_CTRL_REG, reg);
+
+        msleep(200);
+
+        /* Wait for the blocks to come out of reset */
+        rc = mdio_clause45_wait_reset_mmds(efx,
+                                           TENXPRESS_REQUIRED_DEVS);
+        if (rc < 0)
+                return rc;
+
+        /* Try and reconfigure the device */
+        rc = tenxpress_init(efx);
+        if (rc < 0)
+                return rc;
+
+        return 0;
+}
+
 static void tenxpress_set_bad_lp(struct efx_nic *efx, int bad_lp)
 {
         struct tenxpress_phy_data *pd = efx->phy_data;
@@ -301,11 +346,46 @@ static int tenxpress_link_ok(struct efx_nic *efx, int check_lp)
         return ok;
 }
 
+static void tenxpress_phyxs_loopback(struct efx_nic *efx)
+{
+        int phy_id = efx->mii.phy_id;
+        int ctrl1, ctrl2;
+
+        ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PHYXS,
+                                           PHYXS_TEST1);
+        if (efx->loopback_mode == LOOPBACK_PHYXS)
+                ctrl2 |= (1 << LOOPBACK_NEAR_LBN);
+        else
+                ctrl2 &= ~(1 << LOOPBACK_NEAR_LBN);
+        if (ctrl1 != ctrl2)
+                mdio_clause45_write(efx, phy_id, MDIO_MMD_PHYXS,
+                                    PHYXS_TEST1, ctrl2);
+}
+
 static void tenxpress_phy_reconfigure(struct efx_nic *efx)
 {
+        struct tenxpress_phy_data *phy_data = efx->phy_data;
+        int loop_change = LOOPBACK_OUT_OF(phy_data, efx,
+                                          TENXPRESS_LOOPBACKS);
+
         if (!tenxpress_state_is(efx, TENXPRESS_STATUS_NORMAL))
                 return;
 
+        /* When coming out of transmit disable, coming out of low power
+         * mode, or moving out of any PHY internal loopback mode,
+         * perform a special software reset */
+        if ((phy_data->tx_disabled && !efx->tx_disabled) ||
+            loop_change) {
+                (void) tenxpress_special_reset(efx);
+                falcon_reset_xaui(efx);
+        }
+
+        mdio_clause45_transmit_disable(efx);
+        mdio_clause45_phy_reconfigure(efx);
+        tenxpress_phyxs_loopback(efx);
+
+        phy_data->tx_disabled = efx->tx_disabled;
+        phy_data->loopback_mode = efx->loopback_mode;
         efx->link_up = tenxpress_link_ok(efx, 0);
         efx->link_options = GM_LPA_10000FULL;
 }
@@ -433,4 +513,5 @@ struct efx_phy_operations falcon_tenxpress_phy_ops = {
         .clear_interrupt  = tenxpress_phy_clear_interrupt,
         .reset_xaui       = tenxpress_reset_xaui,
         .mmds             = TENXPRESS_REQUIRED_DEVS,
+        .loopbacks        = TENXPRESS_LOOPBACKS,
 };