Merge branch 'stmmac'

Beniamino Galvani says:

====================
net: stmmac glue layer for Amlogic Meson SoCs

the Ethernet controller available in Amlogic Meson6 and Meson8 SoCs is
a Synopsys DesignWare MAC IP core, already supported by the stmmac
driver.

These patches add a glue layer to the driver for the platform-specific
settings required by the Amlogic variant.

This has been tested on a Amlogic S802 device with the initial Meson
support submitted by Carlo Caione [1].

[1] http://lwn.net/Articles/612000/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 109 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/net/meson-dwmac.txt b/Documentation/devicetree/bindings/net/meson-dwmac.txt
new file mode 100644
index 000000000000..ec633d74a8a8
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/meson-dwmac.txt
@@ -0,0 +1,25 @@
+* Amlogic Meson DWMAC Ethernet controller
+
+The device inherits all the properties of the dwmac/stmmac devices
+described in the file net/stmmac.txt with the following changes.
+
+Required properties:
+
+- compatible: should be "amlogic,meson6-dwmac" along with "snps,dwmac"
+              and any applicable more detailed version number
+              described in net/stmmac.txt
+
+- reg: should contain a register range for the dwmac controller and
+       another one for the Amlogic specific configuration
+
+Example:
+
+        ethmac: ethernet@c9410000 {
+                compatible = "amlogic,meson6-dwmac", "snps,dwmac";
+                reg = <0xc9410000 0x10000
+                       0xc1108108 0x4>;
+                interrupts = <0 8 1>;
+                interrupt-names = "macirq";
+                clocks = <&clk81>;
+                clock-names = "stmmaceth";
+        }
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 2d09c116cbc8..b02d4a3ffa37 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -26,6 +26,16 @@ config STMMAC_PLATFORM
 
           If unsure, say N.
 
+config DWMAC_MESON
+        bool "Amlogic Meson dwmac support"
+        depends on STMMAC_PLATFORM && ARCH_MESON
+        help
+          Support for Ethernet controller on Amlogic Meson SoCs.
+
+          This selects the Amlogic Meson SoC glue layer support for
+          the stmmac device driver. This driver is used for Meson6 and
+          Meson8 SoCs.
+
 config DWMAC_SOCFPGA
         bool "SOCFPGA dwmac support"
         depends on STMMAC_PLATFORM && MFD_SYSCON && (ARCH_SOCFPGA || COMPILE_TEST)
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 18695ebef7e4..0533d0ba783d 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_MESON) += dwmac-meson.o
 stmmac-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
 stmmac-$(CONFIG_DWMAC_STI) += dwmac-sti.o
 stmmac-$(CONFIG_DWMAC_SOCFPGA) += dwmac-socfpga.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c
new file mode 100644
index 000000000000..d225a603e604
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c
@@ -0,0 +1,67 @@
+/*
+ * Amlogic Meson DWMAC glue layer
+ *
+ * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/ethtool.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/stmmac.h>
+
+#define ETHMAC_SPEED_100        BIT(1)
+
+struct meson_dwmac {
+        struct device   *dev;
+        void __iomem    *reg;
+};
+
+static void meson6_dwmac_fix_mac_speed(void *priv, unsigned int speed)
+{
+        struct meson_dwmac *dwmac = priv;
+        unsigned int val;
+
+        val = readl(dwmac->reg);
+
+        switch (speed) {
+        case SPEED_10:
+                val &= ~ETHMAC_SPEED_100;
+                break;
+        case SPEED_100:
+                val |= ETHMAC_SPEED_100;
+                break;
+        }
+
+        writel(val, dwmac->reg);
+}
+
+static void *meson6_dwmac_setup(struct platform_device *pdev)
+{
+        struct meson_dwmac *dwmac;
+        struct resource *res;
+
+        dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+        if (!dwmac)
+                return ERR_PTR(-ENOMEM);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        dwmac->reg = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(dwmac->reg))
+                return dwmac->reg;
+
+        return dwmac;
+}
+
+const struct stmmac_of_data meson6_dwmac_data = {
+        .setup          = meson6_dwmac_setup,
+        .fix_mac_speed  = meson6_dwmac_fix_mac_speed,
+};
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 58097c0e2ad5..44528896355d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -137,6 +137,9 @@ void stmmac_disable_eee_mode(struct stmmac_priv *priv);
 bool stmmac_eee_init(struct stmmac_priv *priv);
 
 #ifdef CONFIG_STMMAC_PLATFORM
+#ifdef CONFIG_DWMAC_MESON
+extern const struct stmmac_of_data meson6_dwmac_data;
+#endif
 #ifdef CONFIG_DWMAC_SUNXI
 extern const struct stmmac_of_data sun7i_gmac_data;
 #endif
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index bb524a932be4..652171706258 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_MESON
+        { .compatible = "amlogic,meson6-dwmac", .data = &meson6_dwmac_data},
+#endif
 #ifdef CONFIG_DWMAC_SUNXI
         { .compatible = "allwinner,sun7i-a20-gmac", .data = &sun7i_gmac_data},
 #endif