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273 lines
8.8 KiB
273 lines
8.8 KiB
From af0bd4e9ba809391f275d0c094ac0bfbfbb3f430 Mon Sep 17 00:00:00 2001
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From: Chen-Yu Tsai <wens@csie.org>
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Date: Fri, 17 Jan 2014 21:24:47 +0800
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Subject: [PATCH] net: stmmac: sunxi platform extensions for GMAC in Allwinner
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A20 SoC's
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The Allwinner A20 has an ethernet controller that seems to be
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an early version of Synopsys DesignWare MAC 10/100/1000 Universal,
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which is supported by the stmmac driver.
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Allwinner's GMAC requires setting additional registers in the SoC's
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clock control unit.
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The exact version of the DWMAC IP that Allwinner uses is unknown,
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thus the exact feature set is unknown.
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Signed-off-by: Chen-Yu Tsai <wens@csie.org>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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.../bindings/net/allwinner,sun7i-a20-gmac.txt | 27 ++++
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drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 ++
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drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
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drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c | 140 +++++++++++++++++++++
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drivers/net/ethernet/stmicro/stmmac/stmmac.h | 3 +
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.../net/ethernet/stmicro/stmmac/stmmac_platform.c | 3 +
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6 files changed, 185 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt
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create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
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diff --git a/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt b/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt
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new file mode 100644
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index 0000000..ea4d752
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt
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@@ -0,0 +1,27 @@
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+* Allwinner GMAC ethernet controller
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+
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+This device is a platform glue layer for stmmac.
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+Please see stmmac.txt for the other unchanged properties.
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+
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+Required properties:
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+ - compatible: Should be "allwinner,sun7i-a20-gmac"
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+ - clocks: Should contain the GMAC main clock, and tx clock
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+ The tx clock type should be "allwinner,sun7i-a20-gmac-clk"
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+ - clock-names: Should contain the clock names "stmmaceth",
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+ and "allwinner_gmac_tx"
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+
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+Optional properties:
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+- phy-supply: phandle to a regulator if the PHY needs one
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+
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+Examples:
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+
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+ gmac: ethernet@01c50000 {
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+ compatible = "allwinner,sun7i-a20-gmac";
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+ reg = <0x01c50000 0x10000>,
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+ <0x01c20164 0x4>;
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+ interrupts = <0 85 1>;
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+ interrupt-names = "macirq";
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+ clocks = <&ahb_gates 49>, <&gmac_tx>;
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+ clock-names = "stmmaceth", "allwinner_gmac_tx";
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+ phy-mode = "mii";
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+ };
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diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
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index b59d1ef..e2f202e 100644
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--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
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+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
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@@ -26,6 +26,17 @@ config STMMAC_PLATFORM
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If unsure, say N.
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+config DWMAC_SUNXI
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+ bool "Allwinner GMAC support"
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+ depends on STMMAC_PLATFORM && ARCH_SUNXI
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+ default y
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+ ---help---
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+ Support for Allwinner A20/A31 GMAC ethernet controllers.
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+
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+ This selects Allwinner SoC glue layer support for the
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+ stmmac device driver. This driver is used for A20/A31
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+ GMAC ethernet controller.
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+
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config STMMAC_PCI
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bool "STMMAC PCI bus support"
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depends on STMMAC_ETH && PCI
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diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
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index 356a9dd..ecadece 100644
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--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
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+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
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@@ -1,6 +1,7 @@
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obj-$(CONFIG_STMMAC_ETH) += stmmac.o
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stmmac-$(CONFIG_STMMAC_PLATFORM) += stmmac_platform.o
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stmmac-$(CONFIG_STMMAC_PCI) += stmmac_pci.o
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+stmmac-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
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stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o \
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chain_mode.o dwmac_lib.o dwmac1000_core.o dwmac1000_dma.o \
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dwmac100_core.o dwmac100_dma.o enh_desc.o norm_desc.o \
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diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
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new file mode 100644
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index 0000000..771cd15f
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--- /dev/null
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+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
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@@ -0,0 +1,140 @@
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+/**
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+ * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
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+ *
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+ * Copyright (C) 2013 Chen-Yu Tsai
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+ *
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+ * Chen-Yu Tsai <wens@csie.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/stmmac.h>
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+#include <linux/clk.h>
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+#include <linux/phy.h>
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+#include <linux/of_net.h>
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+#include <linux/regulator/consumer.h>
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+
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+struct sunxi_priv_data {
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+ int interface;
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+ int clk_enabled;
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+ struct clk *tx_clk;
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+ struct regulator *regulator;
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+};
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+
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+static void *sun7i_gmac_setup(struct platform_device *pdev)
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+{
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+ struct sunxi_priv_data *gmac;
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+ struct device *dev = &pdev->dev;
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+
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+ gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
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+ if (!gmac)
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+ return ERR_PTR(-ENOMEM);
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+
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+ gmac->interface = of_get_phy_mode(dev->of_node);
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+
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+ gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
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+ if (IS_ERR(gmac->tx_clk)) {
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+ dev_err(dev, "could not get tx clock\n");
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+ return gmac->tx_clk;
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+ }
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+
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+ /* Optional regulator for PHY */
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+ gmac->regulator = devm_regulator_get_optional(dev, "phy");
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+ if (IS_ERR(gmac->regulator)) {
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+ if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER)
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+ return ERR_PTR(-EPROBE_DEFER);
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+ dev_info(dev, "no regulator found\n");
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+ gmac->regulator = NULL;
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+ }
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+
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+ return gmac;
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+}
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+
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+#define SUN7I_GMAC_GMII_RGMII_RATE 125000000
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+#define SUN7I_GMAC_MII_RATE 25000000
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+
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+static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
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+{
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+ struct sunxi_priv_data *gmac = priv;
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+ int ret;
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+
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+ if (gmac->regulator) {
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+ ret = regulator_enable(gmac->regulator);
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+ if (ret)
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+ return ret;
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+ }
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+
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+ /* Set GMAC interface port mode
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+ *
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+ * The GMAC TX clock lines are configured by setting the clock
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+ * rate, which then uses the auto-reparenting feature of the
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+ * clock driver, and enabling/disabling the clock.
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+ */
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+ if (gmac->interface == PHY_INTERFACE_MODE_RGMII) {
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+ clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
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+ clk_prepare_enable(gmac->tx_clk);
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+ gmac->clk_enabled = 1;
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+ } else {
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+ clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
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+ clk_prepare(gmac->tx_clk);
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+ }
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+
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+ return 0;
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+}
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+
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+static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
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+{
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+ struct sunxi_priv_data *gmac = priv;
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+
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+ if (gmac->clk_enabled) {
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+ clk_disable(gmac->tx_clk);
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+ gmac->clk_enabled = 0;
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+ }
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+ clk_unprepare(gmac->tx_clk);
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+
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+ if (gmac->regulator)
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+ regulator_disable(gmac->regulator);
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+}
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+
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+static void sun7i_fix_speed(void *priv, unsigned int speed)
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+{
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+ struct sunxi_priv_data *gmac = priv;
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+
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+ /* only GMII mode requires us to reconfigure the clock lines */
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+ if (gmac->interface != PHY_INTERFACE_MODE_GMII)
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+ return;
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+
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+ if (gmac->clk_enabled) {
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+ clk_disable(gmac->tx_clk);
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+ gmac->clk_enabled = 0;
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+ }
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+ clk_unprepare(gmac->tx_clk);
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+
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+ if (speed == 1000) {
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+ clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
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+ clk_prepare_enable(gmac->tx_clk);
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+ gmac->clk_enabled = 1;
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+ } else {
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+ clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
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+ clk_prepare(gmac->tx_clk);
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+ }
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+}
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+
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+/* of_data specifying hardware features and callbacks.
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+ * hardware features were copied from Allwinner drivers. */
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+const struct stmmac_of_data sun7i_gmac_data = {
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+ .has_gmac = 1,
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+ .tx_coe = 1,
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+ .fix_mac_speed = sun7i_fix_speed,
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+ .setup = sun7i_gmac_setup,
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+ .init = sun7i_gmac_init,
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+ .exit = sun7i_gmac_exit,
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+};
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diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
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index c1c141f..d9af26e 100644
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--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
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+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
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@@ -130,6 +130,9 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
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bool stmmac_eee_init(struct stmmac_priv *priv);
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#ifdef CONFIG_STMMAC_PLATFORM
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+#ifdef CONFIG_DWMAC_SUNXI
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+extern const struct stmmac_of_data sun7i_gmac_data;
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+#endif
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extern struct platform_driver stmmac_pltfr_driver;
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static inline int stmmac_register_platform(void)
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{
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diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
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index bf119db..9d4baa8 100644
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--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
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+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
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@@ -30,6 +30,9 @@
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#include "stmmac.h"
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static const struct of_device_id stmmac_dt_ids[] = {
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+#ifdef CONFIG_DWMAC_SUNXI
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+ { .compatible = "allwinner,sun7i-a20-gmac", .data = &sun7i_gmac_data},
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+#endif
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/* SoC specific glue layers should come before generic bindings */
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{ .compatible = "st,spear600-gmac"},
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{ .compatible = "snps,dwmac-3.610"},
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--
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1.8.5.5
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