--- /dev/null
+From af0bd4e9ba809391f275d0c094ac0bfbfbb3f430 Mon Sep 17 00:00:00 2001
+From: Chen-Yu Tsai <wens@csie.org>
+Date: Fri, 17 Jan 2014 21:24:47 +0800
+Subject: [PATCH] net: stmmac: sunxi platform extensions for GMAC in Allwinner
+ A20 SoC's
+
+The Allwinner A20 has an ethernet controller that seems to be
+an early version of Synopsys DesignWare MAC 10/100/1000 Universal,
+which is supported by the stmmac driver.
+
+Allwinner's GMAC requires setting additional registers in the SoC's
+clock control unit.
+
+The exact version of the DWMAC IP that Allwinner uses is unknown,
+thus the exact feature set is unknown.
+
+Signed-off-by: Chen-Yu Tsai <wens@csie.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ .../bindings/net/allwinner,sun7i-a20-gmac.txt | 27 ++++
+ drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 ++
+ drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
+ drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c | 140 +++++++++++++++++++++
+ drivers/net/ethernet/stmicro/stmmac/stmmac.h | 3 +
+ .../net/ethernet/stmicro/stmmac/stmmac_platform.c | 3 +
+ 6 files changed, 185 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt
+ create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
+
+diff --git a/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt b/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt
+new file mode 100644
+index 0000000..ea4d752
+--- /dev/null
++++ b/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt
+@@ -0,0 +1,27 @@
++* Allwinner GMAC ethernet controller
++
++This device is a platform glue layer for stmmac.
++Please see stmmac.txt for the other unchanged properties.
++
++Required properties:
++ - compatible: Should be "allwinner,sun7i-a20-gmac"
++ - clocks: Should contain the GMAC main clock, and tx clock
++ The tx clock type should be "allwinner,sun7i-a20-gmac-clk"
++ - clock-names: Should contain the clock names "stmmaceth",
++ and "allwinner_gmac_tx"
++
++Optional properties:
++- phy-supply: phandle to a regulator if the PHY needs one
++
++Examples:
++
++ gmac: ethernet@01c50000 {
++ compatible = "allwinner,sun7i-a20-gmac";
++ reg = <0x01c50000 0x10000>,
++ <0x01c20164 0x4>;
++ interrupts = <0 85 1>;
++ interrupt-names = "macirq";
++ clocks = <&ahb_gates 49>, <&gmac_tx>;
++ clock-names = "stmmaceth", "allwinner_gmac_tx";
++ phy-mode = "mii";
++ };
+diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
+index b59d1ef..e2f202e 100644
+--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
++++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
+@@ -26,6 +26,17 @@ config STMMAC_PLATFORM
+
+ If unsure, say N.
+
++config DWMAC_SUNXI
++ bool "Allwinner GMAC support"
++ depends on STMMAC_PLATFORM && ARCH_SUNXI
++ default y
++ ---help---
++ Support for Allwinner A20/A31 GMAC ethernet controllers.
++
++ This selects Allwinner SoC glue layer support for the
++ stmmac device driver. This driver is used for A20/A31
++ GMAC ethernet controller.
++
+ config STMMAC_PCI
+ bool "STMMAC PCI bus support"
+ depends on STMMAC_ETH && PCI
+diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
+index 356a9dd..ecadece 100644
+--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
++++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
+@@ -1,6 +1,7 @@
+ obj-$(CONFIG_STMMAC_ETH) += stmmac.o
+ stmmac-$(CONFIG_STMMAC_PLATFORM) += stmmac_platform.o
+ stmmac-$(CONFIG_STMMAC_PCI) += stmmac_pci.o
++stmmac-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
+ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o \
+ chain_mode.o dwmac_lib.o dwmac1000_core.o dwmac1000_dma.o \
+ dwmac100_core.o dwmac100_dma.o enh_desc.o norm_desc.o \
+diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
+new file mode 100644
+index 0000000..771cd15f
+--- /dev/null
++++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
+@@ -0,0 +1,140 @@
++/**
++ * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
++ *
++ * Copyright (C) 2013 Chen-Yu Tsai
++ *
++ * Chen-Yu Tsai <wens@csie.org>
++ *
++ * 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.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ */
++
++#include <linux/stmmac.h>
++#include <linux/clk.h>
++#include <linux/phy.h>
++#include <linux/of_net.h>
++#include <linux/regulator/consumer.h>
++
++struct sunxi_priv_data {
++ int interface;
++ int clk_enabled;
++ struct clk *tx_clk;
++ struct regulator *regulator;
++};
++
++static void *sun7i_gmac_setup(struct platform_device *pdev)
++{
++ struct sunxi_priv_data *gmac;
++ struct device *dev = &pdev->dev;
++
++ gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
++ if (!gmac)
++ return ERR_PTR(-ENOMEM);
++
++ gmac->interface = of_get_phy_mode(dev->of_node);
++
++ gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
++ if (IS_ERR(gmac->tx_clk)) {
++ dev_err(dev, "could not get tx clock\n");
++ return gmac->tx_clk;
++ }
++
++ /* Optional regulator for PHY */
++ gmac->regulator = devm_regulator_get_optional(dev, "phy");
++ if (IS_ERR(gmac->regulator)) {
++ if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER)
++ return ERR_PTR(-EPROBE_DEFER);
++ dev_info(dev, "no regulator found\n");
++ gmac->regulator = NULL;
++ }
++
++ return gmac;
++}
++
++#define SUN7I_GMAC_GMII_RGMII_RATE 125000000
++#define SUN7I_GMAC_MII_RATE 25000000
++
++static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
++{
++ struct sunxi_priv_data *gmac = priv;
++ int ret;
++
++ if (gmac->regulator) {
++ ret = regulator_enable(gmac->regulator);
++ if (ret)
++ return ret;
++ }
++
++ /* Set GMAC interface port mode
++ *
++ * The GMAC TX clock lines are configured by setting the clock
++ * rate, which then uses the auto-reparenting feature of the
++ * clock driver, and enabling/disabling the clock.
++ */
++ if (gmac->interface == PHY_INTERFACE_MODE_RGMII) {
++ clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
++ clk_prepare_enable(gmac->tx_clk);
++ gmac->clk_enabled = 1;
++ } else {
++ clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
++ clk_prepare(gmac->tx_clk);
++ }
++
++ return 0;
++}
++
++static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
++{
++ struct sunxi_priv_data *gmac = priv;
++
++ if (gmac->clk_enabled) {
++ clk_disable(gmac->tx_clk);
++ gmac->clk_enabled = 0;
++ }
++ clk_unprepare(gmac->tx_clk);
++
++ if (gmac->regulator)
++ regulator_disable(gmac->regulator);
++}
++
++static void sun7i_fix_speed(void *priv, unsigned int speed)
++{
++ struct sunxi_priv_data *gmac = priv;
++
++ /* only GMII mode requires us to reconfigure the clock lines */
++ if (gmac->interface != PHY_INTERFACE_MODE_GMII)
++ return;
++
++ if (gmac->clk_enabled) {
++ clk_disable(gmac->tx_clk);
++ gmac->clk_enabled = 0;
++ }
++ clk_unprepare(gmac->tx_clk);
++
++ if (speed == 1000) {
++ clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
++ clk_prepare_enable(gmac->tx_clk);
++ gmac->clk_enabled = 1;
++ } else {
++ clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
++ clk_prepare(gmac->tx_clk);
++ }
++}
++
++/* of_data specifying hardware features and callbacks.
++ * hardware features were copied from Allwinner drivers. */
++const struct stmmac_of_data sun7i_gmac_data = {
++ .has_gmac = 1,
++ .tx_coe = 1,
++ .fix_mac_speed = sun7i_fix_speed,
++ .setup = sun7i_gmac_setup,
++ .init = sun7i_gmac_init,
++ .exit = sun7i_gmac_exit,
++};
+diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+index c1c141f..d9af26e 100644
+--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
++++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+@@ -130,6 +130,9 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
+ bool stmmac_eee_init(struct stmmac_priv *priv);
+
+ #ifdef CONFIG_STMMAC_PLATFORM
++#ifdef CONFIG_DWMAC_SUNXI
++extern const struct stmmac_of_data sun7i_gmac_data;
++#endif
+ extern struct platform_driver stmmac_pltfr_driver;
+ static inline int stmmac_register_platform(void)
+ {
+diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+index bf119db..9d4baa8 100644
+--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
++++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+@@ -30,6 +30,9 @@
+ #include "stmmac.h"
+
+ static const struct of_device_id stmmac_dt_ids[] = {
++#ifdef CONFIG_DWMAC_SUNXI
++ { .compatible = "allwinner,sun7i-a20-gmac", .data = &sun7i_gmac_data},
++#endif
+ /* SoC specific glue layers should come before generic bindings */
+ { .compatible = "st,spear600-gmac"},
+ { .compatible = "snps,dwmac-3.610"},
+--
+1.8.5.5
+
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