net: phy: add driver for aquantia phy

This patch added driver to support Aquantia PHYs AQ1202, AQ2104, AQR105,
AQR405, which accessed through clause 45.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 158 insertions, 0 deletions

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 8ef819144220..c07030dbe748 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -14,6 +14,11 @@ if PHYLIB
 
 comment "MII PHY device drivers"
 
+config AQUANTIA_PHY
+        tristate "Drivers for the Aquantia PHYs"
+        ---help---
+          Currently supports the Aquantia AQ1202, AQ2104, AQR105, AQR405
+
 config AT803X_PHY
         tristate "Drivers for Atheros AT803X PHYs"
         ---help---
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 16aac1c3e703..9bb103358c74 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -3,6 +3,7 @@
 libphy-objs                     := phy.o phy_device.o mdio_bus.o
 
 obj-$(CONFIG_PHYLIB)            += libphy.o
+obj-$(CONFIG_AQUANTIA_PHY)      += aquantia.o
 obj-$(CONFIG_MARVELL_PHY)       += marvell.o
 obj-$(CONFIG_DAVICOM_PHY)       += davicom.o
 obj-$(CONFIG_CICADA_PHY)        += cicada.o
diff --git a/drivers/net/phy/aquantia.c b/drivers/net/phy/aquantia.c
new file mode 100644
index 000000000000..73d347d7cb04
--- /dev/null
+++ b/drivers/net/phy/aquantia.c
@@ -0,0 +1,152 @@
+/*
+ * Driver for Aquantia PHY
+ *
+ * Author: Shaohui Xie <Shaohui.Xie@freescale.com>
+ *
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/phy.h>
+#include <linux/mdio.h>
+
+#define PHY_ID_AQ1202   0x03a1b445
+#define PHY_ID_AQ2104   0x03a1b460
+#define PHY_ID_AQR105   0x03a1b4a2
+#define PHY_ID_AQR405   0x03a1b4b0
+
+#define PHY_AQUANTIA_FEATURES   (SUPPORTED_10000baseT_Full | \
+                                 SUPPORTED_1000baseT_Full | \
+                                 SUPPORTED_100baseT_Full | \
+                                 PHY_DEFAULT_FEATURES)
+
+static int aquantia_config_aneg(struct phy_device *phydev)
+{
+        phydev->supported = PHY_AQUANTIA_FEATURES;
+        phydev->advertising = phydev->supported;
+
+        return 0;
+}
+
+static int aquantia_aneg_done(struct phy_device *phydev)
+{
+        int reg;
+
+        reg = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
+        return (reg < 0) ? reg : (reg & BMSR_ANEGCOMPLETE);
+}
+
+static int aquantia_read_status(struct phy_device *phydev)
+{
+        int reg;
+
+        reg = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
+        reg = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
+        if (reg & MDIO_STAT1_LSTATUS)
+                phydev->link = 1;
+        else
+                phydev->link = 0;
+
+        reg = phy_read_mmd(phydev, MDIO_MMD_AN, 0xc800);
+        mdelay(10);
+        reg = phy_read_mmd(phydev, MDIO_MMD_AN, 0xc800);
+
+        switch (reg) {
+        case 0x9:
+                phydev->speed = SPEED_2500;
+                break;
+        case 0x5:
+                phydev->speed = SPEED_1000;
+                break;
+        case 0x3:
+                phydev->speed = SPEED_100;
+                break;
+        case 0x7:
+        default:
+                phydev->speed = SPEED_10000;
+                break;
+        }
+        phydev->duplex = DUPLEX_FULL;
+
+        return 0;
+}
+
+static struct phy_driver aquantia_driver[] = {
+{
+        .phy_id         = PHY_ID_AQ1202,
+        .phy_id_mask    = 0xfffffff0,
+        .name           = "Aquantia AQ1202",
+        .features       = PHY_AQUANTIA_FEATURES,
+        .aneg_done      = aquantia_aneg_done,
+        .config_aneg    = aquantia_config_aneg,
+        .read_status    = aquantia_read_status,
+        .driver         = { .owner = THIS_MODULE,},
+},
+{
+        .phy_id         = PHY_ID_AQ2104,
+        .phy_id_mask    = 0xfffffff0,
+        .name           = "Aquantia AQ2104",
+        .features       = PHY_AQUANTIA_FEATURES,
+        .aneg_done      = aquantia_aneg_done,
+        .config_aneg    = aquantia_config_aneg,
+        .read_status    = aquantia_read_status,
+        .driver         = { .owner = THIS_MODULE,},
+},
+{
+        .phy_id         = PHY_ID_AQR105,
+        .phy_id_mask    = 0xfffffff0,
+        .name           = "Aquantia AQR105",
+        .features       = PHY_AQUANTIA_FEATURES,
+        .aneg_done      = aquantia_aneg_done,
+        .config_aneg    = aquantia_config_aneg,
+        .read_status    = aquantia_read_status,
+        .driver         = { .owner = THIS_MODULE,},
+},
+{
+        .phy_id         = PHY_ID_AQR405,
+        .phy_id_mask    = 0xfffffff0,
+        .name           = "Aquantia AQR405",
+        .features       = PHY_AQUANTIA_FEATURES,
+        .aneg_done      = aquantia_aneg_done,
+        .config_aneg    = aquantia_config_aneg,
+        .read_status    = aquantia_read_status,
+        .driver         = { .owner = THIS_MODULE,},
+},
+};
+
+static int __init aquantia_init(void)
+{
+        return phy_drivers_register(aquantia_driver,
+                                    ARRAY_SIZE(aquantia_driver));
+}
+
+static void __exit aquantia_exit(void)
+{
+        return phy_drivers_unregister(aquantia_driver,
+                                      ARRAY_SIZE(aquantia_driver));
+}
+
+module_init(aquantia_init);
+module_exit(aquantia_exit);
+
+static struct mdio_device_id __maybe_unused aquantia_tbl[] = {
+        { PHY_ID_AQ1202, 0xfffffff0 },
+        { PHY_ID_AQ2104, 0xfffffff0 },
+        { PHY_ID_AQR105, 0xfffffff0 },
+        { PHY_ID_AQR405, 0xfffffff0 },
+        { }
+};
+
+MODULE_DEVICE_TABLE(mdio, aquantia_tbl);
+
+MODULE_DESCRIPTION("Aquantia PHY driver");
+MODULE_AUTHOR("Shaohui Xie <Shaohui.Xie@freescale.com>");
+MODULE_LICENSE("GPL v2");