net: phy: Add Amlogic Meson GXL Internal PHY support

The Amlogic Meson GXL/GXM families embeds an internal RMII Ethernet PHY.

The PHY acts as a generic PHY but needs a slight configuration right
before it's configuration.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

drivers/net/phy/Kconfig

@@ -55,6 +55,9 @@ config PHY_LXT
 config PHY_MARVELL
 	bool "Marvell Ethernet PHYs support"
 
+config PHY_MESON_GXL
+	bool "Amlogic Meson GXL Internal PHY support"
+
 config PHY_MICREL
 	bool "Micrel Ethernet PHYs support"
 	help

drivers/net/phy/Makefile

@@ -21,6 +21,7 @@ obj-$(CONFIG_PHY_LXT) += lxt.o
 obj-$(CONFIG_PHY_MARVELL) += marvell.o
 obj-$(CONFIG_PHY_MICREL_KSZ8XXX) += micrel_ksz8xxx.o
 obj-$(CONFIG_PHY_MICREL_KSZ90X1) += micrel_ksz90x1.o
+obj-$(CONFIG_PHY_MESON_GXL) += meson-gxl.o
 obj-$(CONFIG_PHY_NATSEMI) += natsemi.o
 obj-$(CONFIG_PHY_REALTEK) += realtek.o
 obj-$(CONFIG_PHY_SMSC) += smsc.o

drivers/net/phy/meson-gxl.c

@@ -0,0 +1,57 @@
+/*
+ * Meson GXL Internal PHY Driver
+ *
+ * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
+ * Copyright (C) 2016 BayLibre, SAS. All rights reserved.
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <config.h>
+#include <common.h>
+#include <linux/bitops.h>
+#include <phy.h>
+
+static int meson_gxl_phy_config(struct phy_device *phydev)
+{
+	/* Enable Analog and DSP register Bank access by */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0000);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0400);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0000);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x0400);
+
+	/* Write Analog register 23 */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0x8E0D);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x4417);
+
+	/* Enable fractional PLL */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0x0005);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x5C1B);
+
+	/* Program fraction FR_PLL_DIV1 */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0x029A);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x5C1D);
+
+	/* Program fraction FR_PLL_DIV1 */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x17, 0xAAAA);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x14, 0x5C1C);
+
+	return genphy_config(phydev);
+}
+
+static struct phy_driver meson_gxl_phy_driver = {
+	.name = "Meson GXL Internal PHY",
+	.uid = 0x01814400,
+	.mask = 0xfffffff0,
+	.features = PHY_BASIC_FEATURES,
+	.config = &meson_gxl_phy_config,
+	.startup = &genphy_startup,
+	.shutdown = &genphy_shutdown,
+};
+
+int phy_meson_gxl_init(void)
+{
+	phy_register(&meson_gxl_phy_driver);
+
+	return 0;
+}

drivers/net/phy/phy.c

@@ -494,6 +494,9 @@ int phy_init(void)
 #ifdef CONFIG_PHY_MICREL_KSZ90X1
 	phy_micrel_ksz90x1_init();
 #endif
+#ifdef CONFIG_PHY_MESON_GXL
+	phy_meson_gxl_init();
+#endif
 #ifdef CONFIG_PHY_NATSEMI
 	phy_natsemi_init();
 #endif

include/phy.h

@@ -268,6 +268,7 @@ int phy_lxt_init(void);
 int phy_marvell_init(void);
 int phy_micrel_ksz8xxx_init(void);
 int phy_micrel_ksz90x1_init(void);
+int phy_meson_gxl_init(void);
 int phy_natsemi_init(void);
 int phy_realtek_init(void);
 int phy_smsc_init(void);