cxgb3: add support for the Aquantia 10G-BT phy

Add support for the Aquantia AQ1002 10G-BaseT phy.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 355 insertions, 0 deletions

diff --git a/drivers/net/cxgb3/aq100x.c b/drivers/net/cxgb3/aq100x.c
new file mode 100644
index 000000000000..c51e50d925d0
--- /dev/null
+++ b/drivers/net/cxgb3/aq100x.c
@@ -0,0 +1,355 @@
+/*
+ * Copyright (c) 2005-2008 Chelsio, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "common.h"
+#include "regs.h"
+
+enum {
+        /* MDIO_DEV_PMA_PMD registers */
+        AQ_LINK_STAT    = 0xe800,
+        AQ_IMASK_PMA    = 0xf000,
+
+        /* MDIO_DEV_XGXS registers */
+        AQ_XAUI_RX_CFG  = 0xc400,
+        AQ_XAUI_TX_CFG  = 0xe400,
+
+        /* MDIO_DEV_ANEG registers */
+        AQ_100M_CTRL    = 0x0010,
+        AQ_10G_CTRL     = 0x0020,
+        AQ_1G_CTRL      = 0xc400,
+        AQ_ANEG_STAT    = 0xc800,
+
+        /* MDIO_DEV_VEND1 registers */
+        AQ_FW_VERSION   = 0x0020,
+        AQ_IFLAG_GLOBAL = 0xfc00,
+        AQ_IMASK_GLOBAL = 0xff00,
+};
+
+#define AQBIT(x)        (1 << (x))
+#define IMASK_PMA       AQBIT(0x2)
+#define IMASK_GLOBAL    AQBIT(0xf)
+#define ADV_1G_FULL     AQBIT(0xf)
+#define ADV_1G_HALF     AQBIT(0xe)
+#define ADV_10G_FULL    AQBIT(0xc)
+#define AQ_RESET        (AQBIT(0xe) | AQBIT(0xf))
+#define AQ_LOWPOWER     AQBIT(0xb)
+
+static int aq100x_reset(struct cphy *phy, int wait)
+{
+        /*
+         * Ignore the caller specified wait time; always wait for the reset to
+         * complete. Can take up to 3s.
+         */
+        int err = t3_phy_reset(phy, MDIO_MMD_VEND1, 3000);
+
+        if (err)
+                CH_WARN(phy->adapter, "PHY%d: reset failed (0x%x).\n",
+                        phy->mdio.prtad, err);
+
+        return err;
+}
+
+static int aq100x_intr_enable(struct cphy *phy)
+{
+        int err = t3_mdio_write(phy, MDIO_MMD_PMAPMD, AQ_IMASK_PMA, IMASK_PMA);
+        if (err)
+                return err;
+
+        err = t3_mdio_write(phy, MDIO_MMD_VEND1, AQ_IMASK_GLOBAL, IMASK_GLOBAL);
+        return err;
+}
+
+static int aq100x_intr_disable(struct cphy *phy)
+{
+        return t3_mdio_write(phy, MDIO_MMD_VEND1, AQ_IMASK_GLOBAL, 0);
+}
+
+static int aq100x_intr_clear(struct cphy *phy)
+{
+        unsigned int v;
+
+        t3_mdio_read(phy, MDIO_MMD_VEND1, AQ_IFLAG_GLOBAL, &v);
+        t3_mdio_read(phy, MDIO_MMD_PMAPMD, MDIO_STAT1, &v);
+
+        return 0;
+}
+
+static int aq100x_intr_handler(struct cphy *phy)
+{
+        int err;
+        unsigned int cause, v;
+
+        err = t3_mdio_read(phy, MDIO_MMD_VEND1, AQ_IFLAG_GLOBAL, &cause);
+        if (err)
+                return err;
+
+        /* Read (and reset) the latching version of the status */
+        t3_mdio_read(phy, MDIO_MMD_PMAPMD, MDIO_STAT1, &v);
+
+        return cphy_cause_link_change;
+}
+
+static int aq100x_power_down(struct cphy *phy, int off)
+{
+        return mdio_set_flag(&phy->mdio, phy->mdio.prtad,
+                             MDIO_MMD_PMAPMD, MDIO_CTRL1,
+                             MDIO_CTRL1_LPOWER, off);
+}
+
+static int aq100x_autoneg_enable(struct cphy *phy)
+{
+        int err;
+
+        err = aq100x_power_down(phy, 0);
+        if (!err)
+                err = mdio_set_flag(&phy->mdio, phy->mdio.prtad,
+                                    MDIO_MMD_AN, MDIO_CTRL1,
+                                    BMCR_ANENABLE | BMCR_ANRESTART, 1);
+
+        return err;
+}
+
+static int aq100x_autoneg_restart(struct cphy *phy)
+{
+        int err;
+
+        err = aq100x_power_down(phy, 0);
+        if (!err)
+                err = mdio_set_flag(&phy->mdio, phy->mdio.prtad,
+                                    MDIO_MMD_AN, MDIO_CTRL1,
+                                    BMCR_ANENABLE | BMCR_ANRESTART, 1);
+
+        return err;
+}
+
+static int aq100x_advertise(struct cphy *phy, unsigned int advertise_map)
+{
+        unsigned int adv;
+        int err;
+
+        /* 10G advertisement */
+        adv = 0;
+        if (advertise_map & ADVERTISED_10000baseT_Full)
+                adv |= ADV_10G_FULL;
+        err = t3_mdio_change_bits(phy, MDIO_MMD_AN, AQ_10G_CTRL,
+                                  ADV_10G_FULL, adv);
+        if (err)
+                return err;
+
+        /* 1G advertisement */
+        adv = 0;
+        if (advertise_map & ADVERTISED_1000baseT_Full)
+                adv |= ADV_1G_FULL;
+        if (advertise_map & ADVERTISED_1000baseT_Half)
+                adv |= ADV_1G_HALF;
+        err = t3_mdio_change_bits(phy, MDIO_MMD_AN, AQ_1G_CTRL,
+                                  ADV_1G_FULL | ADV_1G_HALF, adv);
+        if (err)
+                return err;
+
+        /* 100M, pause advertisement */
+        adv = 0;
+        if (advertise_map & ADVERTISED_100baseT_Half)
+                adv |= ADVERTISE_100HALF;
+        if (advertise_map & ADVERTISED_100baseT_Full)
+                adv |= ADVERTISE_100FULL;
+        if (advertise_map & ADVERTISED_Pause)
+                adv |= ADVERTISE_PAUSE_CAP;
+        if (advertise_map & ADVERTISED_Asym_Pause)
+                adv |= ADVERTISE_PAUSE_ASYM;
+        err = t3_mdio_change_bits(phy, MDIO_MMD_AN, AQ_100M_CTRL, 0xfe0, adv);
+
+        return err;
+}
+
+static int aq100x_set_loopback(struct cphy *phy, int mmd, int dir, int enable)
+{
+        return mdio_set_flag(&phy->mdio, phy->mdio.prtad,
+                             MDIO_MMD_PMAPMD, MDIO_CTRL1,
+                             BMCR_LOOPBACK, enable);
+}
+
+static int aq100x_set_speed_duplex(struct cphy *phy, int speed, int duplex)
+{
+        /* no can do */
+        return -1;
+}
+
+static int aq100x_get_link_status(struct cphy *phy, int *link_ok,
+                                  int *speed, int *duplex, int *fc)
+{
+        int err;
+        unsigned int v;
+
+        if (link_ok) {
+                err = t3_mdio_read(phy, MDIO_MMD_PMAPMD, AQ_LINK_STAT, &v);
+                if (err)
+                        return err;
+
+                *link_ok = v & 1;
+                if (!*link_ok)
+                        return 0;
+        }
+
+        err = t3_mdio_read(phy, MDIO_MMD_AN, AQ_ANEG_STAT, &v);
+        if (err)
+                return err;
+
+        if (speed) {
+                switch (v & 0x6) {
+                case 0x6:
+                        *speed = SPEED_10000;
+                        break;
+                case 0x4:
+                        *speed = SPEED_1000;
+                        break;
+                case 0x2:
+                        *speed = SPEED_100;
+                        break;
+                case 0x0:
+                        *speed = SPEED_10;
+                        break;
+                }
+        }
+
+        if (duplex)
+                *duplex = v & 1 ? DUPLEX_FULL : DUPLEX_HALF;
+
+        return 0;
+}
+
+static struct cphy_ops aq100x_ops = {
+        .reset             = aq100x_reset,
+        .intr_enable       = aq100x_intr_enable,
+        .intr_disable      = aq100x_intr_disable,
+        .intr_clear        = aq100x_intr_clear,
+        .intr_handler      = aq100x_intr_handler,
+        .autoneg_enable    = aq100x_autoneg_enable,
+        .autoneg_restart   = aq100x_autoneg_restart,
+        .advertise         = aq100x_advertise,
+        .set_loopback      = aq100x_set_loopback,
+        .set_speed_duplex  = aq100x_set_speed_duplex,
+        .get_link_status   = aq100x_get_link_status,
+        .power_down        = aq100x_power_down,
+        .mmds              = MDIO_DEVS_PMAPMD | MDIO_DEVS_PCS | MDIO_DEVS_PHYXS,
+};
+
+int t3_aq100x_phy_prep(struct cphy *phy, struct adapter *adapter, int phy_addr,
+                       const struct mdio_ops *mdio_ops)
+{
+        unsigned int v, v2, gpio, wait;
+        int err;
+
+        cphy_init(phy, adapter, phy_addr, &aq100x_ops, mdio_ops,
+                  SUPPORTED_1000baseT_Full | SUPPORTED_10000baseT_Full |
+                  SUPPORTED_Autoneg | SUPPORTED_AUI, "1000/10GBASE-T");
+
+        /*
+         * The PHY has been out of reset ever since the system powered up.  So
+         * we do a hard reset over here.
+         */
+        gpio = phy_addr ? F_GPIO10_OUT_VAL : F_GPIO6_OUT_VAL;
+        t3_set_reg_field(adapter, A_T3DBG_GPIO_EN, gpio, 0);
+        msleep(1);
+        t3_set_reg_field(adapter, A_T3DBG_GPIO_EN, gpio, gpio);
+
+        /*
+         * Give it enough time to load the firmware and get ready for mdio.
+         */
+        msleep(1000);
+        wait = 500; /* in 10ms increments */
+        do {
+                err = t3_mdio_read(phy, MDIO_MMD_VEND1, MDIO_CTRL1, &v);
+                if (err || v == 0xffff) {
+
+                        /* Allow prep_adapter to succeed when ffff is read */
+
+                        CH_WARN(adapter, "PHY%d: reset failed (0x%x, 0x%x).\n",
+                                phy_addr, err, v);
+                        goto done;
+                }
+
+                v &= AQ_RESET;
+                if (v)
+                        msleep(10);
+        } while (v && --wait);
+        if (v) {
+                CH_WARN(adapter, "PHY%d: reset timed out (0x%x).\n",
+                        phy_addr, v);
+
+                goto done; /* let prep_adapter succeed */
+        }
+
+        /* Datasheet says 3s max but this has been observed */
+        wait = (500 - wait) * 10 + 1000;
+        if (wait > 3000)
+                CH_WARN(adapter, "PHY%d: reset took %ums\n", phy_addr, wait);
+
+        /* Firmware version check. */
+        t3_mdio_read(phy, MDIO_MMD_VEND1, AQ_FW_VERSION, &v);
+        if (v != 30) {
+                CH_WARN(adapter, "PHY%d: unsupported firmware %d\n",
+                        phy_addr, v);
+                return 0; /* allow t3_prep_adapter to succeed */
+        }
+
+        /*
+         * The PHY should start in really-low-power mode.  Prepare it for normal
+         * operations.
+         */
+        err = t3_mdio_read(phy, MDIO_MMD_VEND1, MDIO_CTRL1, &v);
+        if (err)
+                return err;
+        if (v & AQ_LOWPOWER) {
+                err = t3_mdio_change_bits(phy, MDIO_MMD_VEND1, MDIO_CTRL1,
+                                          AQ_LOWPOWER, 0);
+                if (err)
+                        return err;
+                msleep(10);
+        } else
+                CH_WARN(adapter, "PHY%d does not start in low power mode.\n",
+                        phy_addr);
+
+        /*
+         * Verify XAUI settings, but let prep succeed no matter what.
+         */
+        v = v2 = 0;
+        t3_mdio_read(phy, MDIO_MMD_PHYXS, AQ_XAUI_RX_CFG, &v);
+        t3_mdio_read(phy, MDIO_MMD_PHYXS, AQ_XAUI_TX_CFG, &v2);
+        if (v != 0x1b || v2 != 0x1b)
+                CH_WARN(adapter,
+                        "PHY%d: incorrect XAUI settings (0x%x, 0x%x).\n",
+                        phy_addr, v, v2);
+
+done:
+        return err;
+}