phylib: Add Realtek 821x eth PHY support

this PHY present on the MPC8315E and MPC837xE RDB boards.

Signed-off-by: Johnson Leung <r58129@freescale.com>
Signed-off-by: Kevin Lam <r43770@freescale.com>
Signed-off-by: Joe D'Abbraccio <ljd015@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 86 insertions, 0 deletions

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 7fe03ce774b1..f4ca0591231d 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -60,6 +60,11 @@ config ICPLUS_PHY
         ---help---
           Currently supports the IP175C PHY.
 
+config REALTEK_PHY
+        tristate "Drivers for Realtek PHYs"
+        ---help---
+          Supports the Realtek 821x PHY.
+
 config FIXED_PHY
         bool "Driver for MDIO Bus/PHY emulation with fixed speed/link PHYs"
         ---help---
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 3d6cc7b67a80..5997d6ef702b 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -12,5 +12,6 @@ obj-$(CONFIG_SMSC_PHY)		+= smsc.o
 obj-$(CONFIG_VITESSE_PHY)       += vitesse.o
 obj-$(CONFIG_BROADCOM_PHY)      += broadcom.o
 obj-$(CONFIG_ICPLUS_PHY)        += icplus.o
+obj-$(CONFIG_REALTEK_PHY)       += realtek.o
 obj-$(CONFIG_FIXED_PHY)         += fixed.o
 obj-$(CONFIG_MDIO_BITBANG)      += mdio-bitbang.o
diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
new file mode 100644
index 000000000000..a052a6744a51
--- /dev/null
+++ b/drivers/net/phy/realtek.c
@@ -0,0 +1,80 @@
+/*
+ * drivers/net/phy/realtek.c
+ *
+ * Driver for Realtek PHYs
+ *
+ * Author: Johnson Leung <r58129@freescale.com>
+ *
+ * Copyright (c) 2004 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+#include <linux/phy.h>
+
+#define RTL821x_PHYSR           0x11
+#define RTL821x_PHYSR_DUPLEX    0x2000
+#define RTL821x_PHYSR_SPEED     0xc000
+#define RTL821x_INER            0x12
+#define RTL821x_INER_INIT       0x6400
+#define RTL821x_INSR            0x13
+
+MODULE_DESCRIPTION("Realtek PHY driver");
+MODULE_AUTHOR("Johnson Leung");
+MODULE_LICENSE("GPL");
+
+static int rtl821x_ack_interrupt(struct phy_device *phydev)
+{
+        int err;
+
+        err = phy_read(phydev, RTL821x_INSR);
+
+        return (err < 0) ? err : 0;
+}
+
+static int rtl821x_config_intr(struct phy_device *phydev)
+{
+        int err;
+
+        if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
+                err = phy_write(phydev, RTL821x_INER,
+                                RTL821x_INER_INIT);
+        else
+                err = phy_write(phydev, RTL821x_INER, 0);
+
+        return err;
+}
+
+/* RTL8211B */
+static struct phy_driver rtl821x_driver = {
+        .phy_id         = 0x001cc912,
+        .name           = "RTL821x Gigabit Ethernet",
+        .phy_id_mask    = 0x001fffff,
+        .features       = PHY_GBIT_FEATURES,
+        .flags          = PHY_HAS_INTERRUPT,
+        .config_aneg    = &genphy_config_aneg,
+        .read_status    = &genphy_read_status,
+        .ack_interrupt  = &rtl821x_ack_interrupt,
+        .config_intr    = &rtl821x_config_intr,
+        .driver         = { .owner = THIS_MODULE,},
+};
+
+static int __init realtek_init(void)
+{
+        int ret;
+
+        ret = phy_driver_register(&rtl821x_driver);
+
+        return ret;
+}
+
+static void __exit realtek_exit(void)
+{
+        phy_driver_unregister(&rtl821x_driver);
+}
+
+module_init(realtek_init);
+module_exit(realtek_exit);