These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

10 files changed, 296 insertions, 411 deletions

diff --git a/kernel/arch/mips/ath79/Kconfig b/kernel/arch/mips/ath79/Kconfig
index dfc60209d..13c04cf54 100644
--- a/kernel/arch/mips/ath79/Kconfig
+++ b/kernel/arch/mips/ath79/Kconfig
@@ -71,6 +71,18 @@ config ATH79_MACH_UBNT_XM
 	  Say 'Y' here if you want your kernel to support the
 	  Ubiquiti Networks XM (rev 1.0) board.
 
+choice
+	prompt "Build a DTB in the kernel"
+	optional
+	help
+	  Select a devicetree that should be built into the kernel.
+
+	config DTB_TL_WR1043ND_V1
+		bool "TL-WR1043ND Version 1"
+		select BUILTIN_DTB
+		select SOC_AR913X
+endchoice
+
 endmenu
 
 config SOC_AR71XX
diff --git a/kernel/arch/mips/ath79/Makefile b/kernel/arch/mips/ath79/Makefile
index 5c9ff692f..fcc382cfc 100644
--- a/kernel/arch/mips/ath79/Makefile
+++ b/kernel/arch/mips/ath79/Makefile
@@ -8,7 +8,7 @@
 # under the terms of the GNU General Public License version 2 as published
 # by the Free Software Foundation.
 
-obj-y	:= prom.o setup.o irq.o common.o clock.o gpio.o
+obj-y	:= prom.o setup.o irq.o common.o clock.o
 
 obj-$(CONFIG_EARLY_PRINTK)		+= early_printk.o
 obj-$(CONFIG_PCI)			+= pci.o
diff --git a/kernel/arch/mips/ath79/clock.c b/kernel/arch/mips/ath79/clock.c
index 26479f437..eb5117ced 100644
--- a/kernel/arch/mips/ath79/clock.c
+++ b/kernel/arch/mips/ath79/clock.c
@@ -17,6 +17,7 @@
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/clkdev.h>
+#include <linux/clk-provider.h>
 
 #include <asm/div64.h>
 
@@ -28,24 +29,27 @@
 #define AR724X_BASE_FREQ	5000000
 #define AR913X_BASE_FREQ	5000000
 
-struct clk {
-	unsigned long rate;
+static struct clk *clks[3];
+static struct clk_onecell_data clk_data = {
+	.clks = clks,
+	.clk_num = ARRAY_SIZE(clks),
 };
 
-static void __init ath79_add_sys_clkdev(const char *id, unsigned long rate)
+static struct clk *__init ath79_add_sys_clkdev(
+	const char *id, unsigned long rate)
 {
 	struct clk *clk;
 	int err;
 
-	clk = kzalloc(sizeof(*clk), GFP_KERNEL);
+	clk = clk_register_fixed_rate(NULL, id, NULL, CLK_IS_ROOT, rate);
 	if (!clk)
 		panic("failed to allocate %s clock structure", id);
 
-	clk->rate = rate;
-
 	err = clk_register_clkdev(clk, id, NULL);
 	if (err)
 		panic("unable to register %s clock device", id);
+
+	return clk;
 }
 
 static void __init ar71xx_clocks_init(void)
@@ -62,7 +66,7 @@ static void __init ar71xx_clocks_init(void)
 
 	pll = ath79_pll_rr(AR71XX_PLL_REG_CPU_CONFIG);
 
-	div = ((pll >> AR71XX_PLL_DIV_SHIFT) & AR71XX_PLL_DIV_MASK) + 1;
+	div = ((pll >> AR71XX_PLL_FB_SHIFT) & AR71XX_PLL_FB_MASK) + 1;
 	freq = div * ref_rate;
 
 	div = ((pll >> AR71XX_CPU_DIV_SHIFT) & AR71XX_CPU_DIV_MASK) + 1;
@@ -75,9 +79,9 @@ static void __init ar71xx_clocks_init(void)
 	ahb_rate = cpu_rate / div;
 
 	ath79_add_sys_clkdev("ref", ref_rate);
-	ath79_add_sys_clkdev("cpu", cpu_rate);
-	ath79_add_sys_clkdev("ddr", ddr_rate);
-	ath79_add_sys_clkdev("ahb", ahb_rate);
+	clks[0] = ath79_add_sys_clkdev("cpu", cpu_rate);
+	clks[1] = ath79_add_sys_clkdev("ddr", ddr_rate);
+	clks[2] = ath79_add_sys_clkdev("ahb", ahb_rate);
 
 	clk_add_alias("wdt", NULL, "ahb", NULL);
 	clk_add_alias("uart", NULL, "ahb", NULL);
@@ -96,7 +100,7 @@ static void __init ar724x_clocks_init(void)
 	ref_rate = AR724X_BASE_FREQ;
 	pll = ath79_pll_rr(AR724X_PLL_REG_CPU_CONFIG);
 
-	div = ((pll >> AR724X_PLL_DIV_SHIFT) & AR724X_PLL_DIV_MASK);
+	div = ((pll >> AR724X_PLL_FB_SHIFT) & AR724X_PLL_FB_MASK);
 	freq = div * ref_rate;
 
 	div = ((pll >> AR724X_PLL_REF_DIV_SHIFT) & AR724X_PLL_REF_DIV_MASK);
@@ -111,9 +115,9 @@ static void __init ar724x_clocks_init(void)
 	ahb_rate = cpu_rate / div;
 
 	ath79_add_sys_clkdev("ref", ref_rate);
-	ath79_add_sys_clkdev("cpu", cpu_rate);
-	ath79_add_sys_clkdev("ddr", ddr_rate);
-	ath79_add_sys_clkdev("ahb", ahb_rate);
+	clks[0] = ath79_add_sys_clkdev("cpu", cpu_rate);
+	clks[1] = ath79_add_sys_clkdev("ddr", ddr_rate);
+	clks[2] = ath79_add_sys_clkdev("ahb", ahb_rate);
 
 	clk_add_alias("wdt", NULL, "ahb", NULL);
 	clk_add_alias("uart", NULL, "ahb", NULL);
@@ -132,7 +136,7 @@ static void __init ar913x_clocks_init(void)
 	ref_rate = AR913X_BASE_FREQ;
 	pll = ath79_pll_rr(AR913X_PLL_REG_CPU_CONFIG);
 
-	div = ((pll >> AR913X_PLL_DIV_SHIFT) & AR913X_PLL_DIV_MASK);
+	div = ((pll >> AR913X_PLL_FB_SHIFT) & AR913X_PLL_FB_MASK);
 	freq = div * ref_rate;
 
 	cpu_rate = freq;
@@ -144,9 +148,9 @@ static void __init ar913x_clocks_init(void)
 	ahb_rate = cpu_rate / div;
 
 	ath79_add_sys_clkdev("ref", ref_rate);
-	ath79_add_sys_clkdev("cpu", cpu_rate);
-	ath79_add_sys_clkdev("ddr", ddr_rate);
-	ath79_add_sys_clkdev("ahb", ahb_rate);
+	clks[0] = ath79_add_sys_clkdev("cpu", cpu_rate);
+	clks[1] = ath79_add_sys_clkdev("ddr", ddr_rate);
+	clks[2] = ath79_add_sys_clkdev("ahb", ahb_rate);
 
 	clk_add_alias("wdt", NULL, "ahb", NULL);
 	clk_add_alias("uart", NULL, "ahb", NULL);
@@ -206,9 +210,9 @@ static void __init ar933x_clocks_init(void)
 	}
 
 	ath79_add_sys_clkdev("ref", ref_rate);
-	ath79_add_sys_clkdev("cpu", cpu_rate);
-	ath79_add_sys_clkdev("ddr", ddr_rate);
-	ath79_add_sys_clkdev("ahb", ahb_rate);
+	clks[0] = ath79_add_sys_clkdev("cpu", cpu_rate);
+	clks[1] = ath79_add_sys_clkdev("ddr", ddr_rate);
+	clks[2] = ath79_add_sys_clkdev("ahb", ahb_rate);
 
 	clk_add_alias("wdt", NULL, "ahb", NULL);
 	clk_add_alias("uart", NULL, "ref", NULL);
@@ -340,9 +344,9 @@ static void __init ar934x_clocks_init(void)
 		ahb_rate = cpu_pll / (postdiv + 1);
 
 	ath79_add_sys_clkdev("ref", ref_rate);
-	ath79_add_sys_clkdev("cpu", cpu_rate);
-	ath79_add_sys_clkdev("ddr", ddr_rate);
-	ath79_add_sys_clkdev("ahb", ahb_rate);
+	clks[0] = ath79_add_sys_clkdev("cpu", cpu_rate);
+	clks[1] = ath79_add_sys_clkdev("ddr", ddr_rate);
+	clks[2] = ath79_add_sys_clkdev("ahb", ahb_rate);
 
 	clk_add_alias("wdt", NULL, "ref", NULL);
 	clk_add_alias("uart", NULL, "ref", NULL);
@@ -427,9 +431,9 @@ static void __init qca955x_clocks_init(void)
 		ahb_rate = cpu_pll / (postdiv + 1);
 
 	ath79_add_sys_clkdev("ref", ref_rate);
-	ath79_add_sys_clkdev("cpu", cpu_rate);
-	ath79_add_sys_clkdev("ddr", ddr_rate);
-	ath79_add_sys_clkdev("ahb", ahb_rate);
+	clks[0] = ath79_add_sys_clkdev("cpu", cpu_rate);
+	clks[1] = ath79_add_sys_clkdev("ddr", ddr_rate);
+	clks[2] = ath79_add_sys_clkdev("ahb", ahb_rate);
 
 	clk_add_alias("wdt", NULL, "ref", NULL);
 	clk_add_alias("uart", NULL, "ref", NULL);
@@ -451,6 +455,8 @@ void __init ath79_clocks_init(void)
 		qca955x_clocks_init();
 	else
 		BUG();
+
+	of_clk_init(NULL);
 }
 
 unsigned long __init
@@ -469,22 +475,16 @@ ath79_get_sys_clk_rate(const char *id)
 	return rate;
 }
 
-/*
- * Linux clock API
- */
-int clk_enable(struct clk *clk)
+#ifdef CONFIG_OF
+static void __init ath79_clocks_init_dt(struct device_node *np)
 {
-	return 0;
+	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
 }
-EXPORT_SYMBOL(clk_enable);
 
-void clk_disable(struct clk *clk)
-{
-}
-EXPORT_SYMBOL(clk_disable);
-
-unsigned long clk_get_rate(struct clk *clk)
-{
-	return clk->rate;
-}
-EXPORT_SYMBOL(clk_get_rate);
+CLK_OF_DECLARE(ar7100, "qca,ar7100-pll", ath79_clocks_init_dt);
+CLK_OF_DECLARE(ar7240, "qca,ar7240-pll", ath79_clocks_init_dt);
+CLK_OF_DECLARE(ar9130, "qca,ar9130-pll", ath79_clocks_init_dt);
+CLK_OF_DECLARE(ar9330, "qca,ar9330-pll", ath79_clocks_init_dt);
+CLK_OF_DECLARE(ar9340, "qca,ar9340-pll", ath79_clocks_init_dt);
+CLK_OF_DECLARE(ar9550, "qca,qca9550-pll", ath79_clocks_init_dt);
+#endif
diff --git a/kernel/arch/mips/ath79/common.c b/kernel/arch/mips/ath79/common.c
index eb3966cd8..3cedd1f95 100644
--- a/kernel/arch/mips/ath79/common.c
+++ b/kernel/arch/mips/ath79/common.c
@@ -38,11 +38,27 @@ unsigned int ath79_soc_rev;
 void __iomem *ath79_pll_base;
 void __iomem *ath79_reset_base;
 EXPORT_SYMBOL_GPL(ath79_reset_base);
-void __iomem *ath79_ddr_base;
+static void __iomem *ath79_ddr_base;
+static void __iomem *ath79_ddr_wb_flush_base;
+static void __iomem *ath79_ddr_pci_win_base;
+
+void ath79_ddr_ctrl_init(void)
+{
+	ath79_ddr_base = ioremap_nocache(AR71XX_DDR_CTRL_BASE,
+					 AR71XX_DDR_CTRL_SIZE);
+	if (soc_is_ar71xx() || soc_is_ar934x()) {
+		ath79_ddr_wb_flush_base = ath79_ddr_base + 0x9c;
+		ath79_ddr_pci_win_base = ath79_ddr_base + 0x7c;
+	} else {
+		ath79_ddr_wb_flush_base = ath79_ddr_base + 0x7c;
+		ath79_ddr_pci_win_base = 0;
+	}
+}
+EXPORT_SYMBOL_GPL(ath79_ddr_ctrl_init);
 
 void ath79_ddr_wb_flush(u32 reg)
 {
-	void __iomem *flush_reg = ath79_ddr_base + reg;
+	void __iomem *flush_reg = ath79_ddr_wb_flush_base + reg;
 
 	/* Flush the DDR write buffer. */
 	__raw_writel(0x1, flush_reg);
@@ -56,6 +72,21 @@ void ath79_ddr_wb_flush(u32 reg)
 }
 EXPORT_SYMBOL_GPL(ath79_ddr_wb_flush);
 
+void ath79_ddr_set_pci_windows(void)
+{
+	BUG_ON(!ath79_ddr_pci_win_base);
+
+	__raw_writel(AR71XX_PCI_WIN0_OFFS, ath79_ddr_pci_win_base + 0);
+	__raw_writel(AR71XX_PCI_WIN1_OFFS, ath79_ddr_pci_win_base + 1);
+	__raw_writel(AR71XX_PCI_WIN2_OFFS, ath79_ddr_pci_win_base + 2);
+	__raw_writel(AR71XX_PCI_WIN3_OFFS, ath79_ddr_pci_win_base + 3);
+	__raw_writel(AR71XX_PCI_WIN4_OFFS, ath79_ddr_pci_win_base + 4);
+	__raw_writel(AR71XX_PCI_WIN5_OFFS, ath79_ddr_pci_win_base + 5);
+	__raw_writel(AR71XX_PCI_WIN6_OFFS, ath79_ddr_pci_win_base + 6);
+	__raw_writel(AR71XX_PCI_WIN7_OFFS, ath79_ddr_pci_win_base + 7);
+}
+EXPORT_SYMBOL_GPL(ath79_ddr_set_pci_windows);
+
 void ath79_device_reset_set(u32 mask)
 {
 	unsigned long flags;
diff --git a/kernel/arch/mips/ath79/common.h b/kernel/arch/mips/ath79/common.h
index c39de61f9..ca7cc19ad 100644
--- a/kernel/arch/mips/ath79/common.h
+++ b/kernel/arch/mips/ath79/common.h
@@ -22,11 +22,9 @@
 void ath79_clocks_init(void);
 unsigned long ath79_get_sys_clk_rate(const char *id);
 
+void ath79_ddr_ctrl_init(void);
 void ath79_ddr_wb_flush(unsigned int reg);
 
-void ath79_gpio_function_enable(u32 mask);
-void ath79_gpio_function_disable(u32 mask);
-void ath79_gpio_function_setup(u32 set, u32 clear);
 void ath79_gpio_init(void);
 
 #endif /* __ATH79_COMMON_H */
diff --git a/kernel/arch/mips/ath79/dev-common.c b/kernel/arch/mips/ath79/dev-common.c
index 516225d20..9d0172a4d 100644
--- a/kernel/arch/mips/ath79/dev-common.c
+++ b/kernel/arch/mips/ath79/dev-common.c
@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
+#include <linux/platform_data/gpio-ath79.h>
 #include <linux/serial_8250.h>
 #include <linux/clk.h>
 #include <linux/err.h>
@@ -106,3 +107,53 @@ void __init ath79_register_wdt(void)
 
 	platform_device_register_simple("ath79-wdt", -1, &res, 1);
 }
+
+static struct ath79_gpio_platform_data ath79_gpio_pdata;
+
+static struct resource ath79_gpio_resources[] = {
+	{
+		.flags = IORESOURCE_MEM,
+		.start = AR71XX_GPIO_BASE,
+		.end = AR71XX_GPIO_BASE + AR71XX_GPIO_SIZE - 1,
+	},
+	{
+		.start	= ATH79_MISC_IRQ(2),
+		.end	= ATH79_MISC_IRQ(2),
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device ath79_gpio_device = {
+	.name		= "ath79-gpio",
+	.id		= -1,
+	.resource	= ath79_gpio_resources,
+	.num_resources	= ARRAY_SIZE(ath79_gpio_resources),
+	.dev = {
+		.platform_data	= &ath79_gpio_pdata
+	},
+};
+
+void __init ath79_gpio_init(void)
+{
+	if (soc_is_ar71xx()) {
+		ath79_gpio_pdata.ngpios = AR71XX_GPIO_COUNT;
+	} else if (soc_is_ar7240()) {
+		ath79_gpio_pdata.ngpios = AR7240_GPIO_COUNT;
+	} else if (soc_is_ar7241() || soc_is_ar7242()) {
+		ath79_gpio_pdata.ngpios = AR7241_GPIO_COUNT;
+	} else if (soc_is_ar913x()) {
+		ath79_gpio_pdata.ngpios = AR913X_GPIO_COUNT;
+	} else if (soc_is_ar933x()) {
+		ath79_gpio_pdata.ngpios = AR933X_GPIO_COUNT;
+	} else if (soc_is_ar934x()) {
+		ath79_gpio_pdata.ngpios = AR934X_GPIO_COUNT;
+		ath79_gpio_pdata.oe_inverted = 1;
+	} else if (soc_is_qca955x()) {
+		ath79_gpio_pdata.ngpios = QCA955X_GPIO_COUNT;
+		ath79_gpio_pdata.oe_inverted = 1;
+	} else {
+		BUG();
+	}
+
+	platform_device_register(&ath79_gpio_device);
+}
diff --git a/kernel/arch/mips/ath79/gpio.c b/kernel/arch/mips/ath79/gpio.c
deleted file mode 100644
index 8d025b028..000000000
--- a/kernel/arch/mips/ath79/gpio.c
+++ /dev/null
@@ -1,244 +0,0 @@
-/*
- *  Atheros AR71XX/AR724X/AR913X GPIO API support
- *
- *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
- *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
- *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
- *
- *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
- *
- *  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.
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/spinlock.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
-#include <linux/gpio.h>
-
-#include <asm/mach-ath79/ar71xx_regs.h>
-#include <asm/mach-ath79/ath79.h>
-#include "common.h"
-
-static void __iomem *ath79_gpio_base;
-static unsigned long ath79_gpio_count;
-static DEFINE_SPINLOCK(ath79_gpio_lock);
-
-static void __ath79_gpio_set_value(unsigned gpio, int value)
-{
-	void __iomem *base = ath79_gpio_base;
-
-	if (value)
-		__raw_writel(1 << gpio, base + AR71XX_GPIO_REG_SET);
-	else
-		__raw_writel(1 << gpio, base + AR71XX_GPIO_REG_CLEAR);
-}
-
-static int __ath79_gpio_get_value(unsigned gpio)
-{
-	return (__raw_readl(ath79_gpio_base + AR71XX_GPIO_REG_IN) >> gpio) & 1;
-}
-
-static int ath79_gpio_get_value(struct gpio_chip *chip, unsigned offset)
-{
-	return __ath79_gpio_get_value(offset);
-}
-
-static void ath79_gpio_set_value(struct gpio_chip *chip,
-				  unsigned offset, int value)
-{
-	__ath79_gpio_set_value(offset, value);
-}
-
-static int ath79_gpio_direction_input(struct gpio_chip *chip,
-				       unsigned offset)
-{
-	void __iomem *base = ath79_gpio_base;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ath79_gpio_lock, flags);
-
-	__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
-		     base + AR71XX_GPIO_REG_OE);
-
-	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
-
-	return 0;
-}
-
-static int ath79_gpio_direction_output(struct gpio_chip *chip,
-					unsigned offset, int value)
-{
-	void __iomem *base = ath79_gpio_base;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ath79_gpio_lock, flags);
-
-	if (value)
-		__raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET);
-	else
-		__raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR);
-
-	__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset),
-		     base + AR71XX_GPIO_REG_OE);
-
-	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
-
-	return 0;
-}
-
-static int ar934x_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
-	void __iomem *base = ath79_gpio_base;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ath79_gpio_lock, flags);
-
-	__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset),
-		     base + AR71XX_GPIO_REG_OE);
-
-	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
-
-	return 0;
-}
-
-static int ar934x_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
-					int value)
-{
-	void __iomem *base = ath79_gpio_base;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ath79_gpio_lock, flags);
-
-	if (value)
-		__raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET);
-	else
-		__raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR);
-
-	__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
-		     base + AR71XX_GPIO_REG_OE);
-
-	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
-
-	return 0;
-}
-
-static struct gpio_chip ath79_gpio_chip = {
-	.label			= "ath79",
-	.get			= ath79_gpio_get_value,
-	.set			= ath79_gpio_set_value,
-	.direction_input	= ath79_gpio_direction_input,
-	.direction_output	= ath79_gpio_direction_output,
-	.base			= 0,
-};
-
-static void __iomem *ath79_gpio_get_function_reg(void)
-{
-	u32 reg = 0;
-
-	if (soc_is_ar71xx() ||
-	    soc_is_ar724x() ||
-	    soc_is_ar913x() ||
-	    soc_is_ar933x())
-		reg = AR71XX_GPIO_REG_FUNC;
-	else if (soc_is_ar934x())
-		reg = AR934X_GPIO_REG_FUNC;
-	else
-		BUG();
-
-	return ath79_gpio_base + reg;
-}
-
-void ath79_gpio_function_setup(u32 set, u32 clear)
-{
-	void __iomem *reg = ath79_gpio_get_function_reg();
-	unsigned long flags;
-
-	spin_lock_irqsave(&ath79_gpio_lock, flags);
-
-	__raw_writel((__raw_readl(reg) & ~clear) | set, reg);
-	/* flush write */
-	__raw_readl(reg);
-
-	spin_unlock_irqrestore(&ath79_gpio_lock, flags);
-}
-
-void ath79_gpio_function_enable(u32 mask)
-{
-	ath79_gpio_function_setup(mask, 0);
-}
-
-void ath79_gpio_function_disable(u32 mask)
-{
-	ath79_gpio_function_setup(0, mask);
-}
-
-void __init ath79_gpio_init(void)
-{
-	int err;
-
-	if (soc_is_ar71xx())
-		ath79_gpio_count = AR71XX_GPIO_COUNT;
-	else if (soc_is_ar7240())
-		ath79_gpio_count = AR7240_GPIO_COUNT;
-	else if (soc_is_ar7241() || soc_is_ar7242())
-		ath79_gpio_count = AR7241_GPIO_COUNT;
-	else if (soc_is_ar913x())
-		ath79_gpio_count = AR913X_GPIO_COUNT;
-	else if (soc_is_ar933x())
-		ath79_gpio_count = AR933X_GPIO_COUNT;
-	else if (soc_is_ar934x())
-		ath79_gpio_count = AR934X_GPIO_COUNT;
-	else if (soc_is_qca955x())
-		ath79_gpio_count = QCA955X_GPIO_COUNT;
-	else
-		BUG();
-
-	ath79_gpio_base = ioremap_nocache(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE);
-	ath79_gpio_chip.ngpio = ath79_gpio_count;
-	if (soc_is_ar934x() || soc_is_qca955x()) {
-		ath79_gpio_chip.direction_input = ar934x_gpio_direction_input;
-		ath79_gpio_chip.direction_output = ar934x_gpio_direction_output;
-	}
-
-	err = gpiochip_add(&ath79_gpio_chip);
-	if (err)
-		panic("cannot add AR71xx GPIO chip, error=%d", err);
-}
-
-int gpio_get_value(unsigned gpio)
-{
-	if (gpio < ath79_gpio_count)
-		return __ath79_gpio_get_value(gpio);
-
-	return __gpio_get_value(gpio);
-}
-EXPORT_SYMBOL(gpio_get_value);
-
-void gpio_set_value(unsigned gpio, int value)
-{
-	if (gpio < ath79_gpio_count)
-		__ath79_gpio_set_value(gpio, value);
-	else
-		__gpio_set_value(gpio, value);
-}
-EXPORT_SYMBOL(gpio_set_value);
-
-int gpio_to_irq(unsigned gpio)
-{
-	/* FIXME */
-	return -EINVAL;
-}
-EXPORT_SYMBOL(gpio_to_irq);
-
-int irq_to_gpio(unsigned irq)
-{
-	/* FIXME */
-	return -EINVAL;
-}
-EXPORT_SYMBOL(irq_to_gpio);
diff --git a/kernel/arch/mips/ath79/irq.c b/kernel/arch/mips/ath79/irq.c
index 6adae366f..eeb3953ed 100644
--- a/kernel/arch/mips/ath79/irq.c
+++ b/kernel/arch/mips/ath79/irq.c
@@ -15,7 +15,8 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
-#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/of_irq.h>
 
 #include <asm/irq_cpu.h>
 #include <asm/mipsregs.h>
@@ -23,11 +24,9 @@
 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/ar71xx_regs.h>
 #include "common.h"
+#include "machtypes.h"
 
-static void (*ath79_ip2_handler)(void);
-static void (*ath79_ip3_handler)(void);
-
-static void ath79_misc_irq_handler(unsigned int irq, struct irq_desc *desc)
+static void ath79_misc_irq_handler(struct irq_desc *desc)
 {
 	void __iomem *base = ath79_reset_base;
 	u32 pending;
@@ -120,25 +119,21 @@ static void __init ath79_misc_irq_init(void)
 	irq_set_chained_handler(ATH79_CPU_IRQ(6), ath79_misc_irq_handler);
 }
 
-static void ar934x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc)
+static void ar934x_ip2_irq_dispatch(struct irq_desc *desc)
 {
 	u32 status;
 
-	disable_irq_nosync(irq);
-
 	status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);
 
 	if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
-		ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_PCIE);
+		ath79_ddr_wb_flush(3);
 		generic_handle_irq(ATH79_IP2_IRQ(0));
 	} else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
-		ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_WMAC);
+		ath79_ddr_wb_flush(4);
 		generic_handle_irq(ATH79_IP2_IRQ(1));
 	} else {
 		spurious_interrupt();
 	}
-
-	enable_irq(irq);
 }
 
 static void ar934x_ip2_irq_init(void)
@@ -153,18 +148,16 @@ static void ar934x_ip2_irq_init(void)
 	irq_set_chained_handler(ATH79_CPU_IRQ(2), ar934x_ip2_irq_dispatch);
 }
 
-static void qca955x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc)
+static void qca955x_ip2_irq_dispatch(struct irq_desc *desc)
 {
 	u32 status;
 
-	disable_irq_nosync(irq);
-
 	status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
 	status &= QCA955X_EXT_INT_PCIE_RC1_ALL | QCA955X_EXT_INT_WMAC_ALL;
 
 	if (status == 0) {
 		spurious_interrupt();
-		goto enable;
+		return;
 	}
 
 	if (status & QCA955X_EXT_INT_PCIE_RC1_ALL) {
@@ -176,17 +169,12 @@ static void qca955x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc)
 		/* TODO: flush DDR? */
 		generic_handle_irq(ATH79_IP2_IRQ(1));
 	}
-
-enable:
-	enable_irq(irq);
 }
 
-static void qca955x_ip3_irq_dispatch(unsigned int irq, struct irq_desc *desc)
+static void qca955x_ip3_irq_dispatch(struct irq_desc *desc)
 {
 	u32 status;
 
-	disable_irq_nosync(irq);
-
 	status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
 	status &= QCA955X_EXT_INT_PCIE_RC2_ALL |
 		  QCA955X_EXT_INT_USB1 |
@@ -194,7 +182,7 @@ static void qca955x_ip3_irq_dispatch(unsigned int irq, struct irq_desc *desc)
 
 	if (status == 0) {
 		spurious_interrupt();
-		goto enable;
+		return;
 	}
 
 	if (status & QCA955X_EXT_INT_USB1) {
@@ -211,9 +199,6 @@ static void qca955x_ip3_irq_dispatch(unsigned int irq, struct irq_desc *desc)
 		/* TODO: flush DDR? */
 		generic_handle_irq(ATH79_IP3_IRQ(2));
 	}
-
-enable:
-	enable_irq(irq);
 }
 
 static void qca955x_irq_init(void)
@@ -235,128 +220,150 @@ static void qca955x_irq_init(void)
 	irq_set_chained_handler(ATH79_CPU_IRQ(3), qca955x_ip3_irq_dispatch);
 }
 
-asmlinkage void plat_irq_dispatch(void)
-{
-	unsigned long pending;
-
-	pending = read_c0_status() & read_c0_cause() & ST0_IM;
-
-	if (pending & STATUSF_IP7)
-		do_IRQ(ATH79_CPU_IRQ(7));
-
-	else if (pending & STATUSF_IP2)
-		ath79_ip2_handler();
-
-	else if (pending & STATUSF_IP4)
-		do_IRQ(ATH79_CPU_IRQ(4));
-
-	else if (pending & STATUSF_IP5)
-		do_IRQ(ATH79_CPU_IRQ(5));
-
-	else if (pending & STATUSF_IP3)
-		ath79_ip3_handler();
-
-	else if (pending & STATUSF_IP6)
-		do_IRQ(ATH79_CPU_IRQ(6));
-
-	else
-		spurious_interrupt();
-}
-
 /*
  * The IP2/IP3 lines are tied to a PCI/WMAC/USB device. Drivers for
  * these devices typically allocate coherent DMA memory, however the
  * DMA controller may still have some unsynchronized data in the FIFO.
  * Issue a flush in the handlers to ensure that the driver sees
  * the update.
+ *
+ * This array map the interrupt lines to the DDR write buffer channels.
  */
 
-static void ath79_default_ip2_handler(void)
-{
-	do_IRQ(ATH79_CPU_IRQ(2));
-}
+static unsigned irq_wb_chan[8] = {
+	-1, -1, -1, -1, -1, -1, -1, -1,
+};
 
-static void ath79_default_ip3_handler(void)
+asmlinkage void plat_irq_dispatch(void)
 {
-	do_IRQ(ATH79_CPU_IRQ(3));
-}
+	unsigned long pending;
+	int irq;
 
-static void ar71xx_ip2_handler(void)
-{
-	ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_PCI);
-	do_IRQ(ATH79_CPU_IRQ(2));
-}
+	pending = read_c0_status() & read_c0_cause() & ST0_IM;
 
-static void ar724x_ip2_handler(void)
-{
-	ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_PCIE);
-	do_IRQ(ATH79_CPU_IRQ(2));
-}
+	if (!pending) {
+		spurious_interrupt();
+		return;
+	}
 
-static void ar913x_ip2_handler(void)
-{
-	ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_WMAC);
-	do_IRQ(ATH79_CPU_IRQ(2));
+	pending >>= CAUSEB_IP;
+	while (pending) {
+		irq = fls(pending) - 1;
+		if (irq < ARRAY_SIZE(irq_wb_chan) && irq_wb_chan[irq] != -1)
+			ath79_ddr_wb_flush(irq_wb_chan[irq]);
+		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
+		pending &= ~BIT(irq);
+	}
 }
 
-static void ar933x_ip2_handler(void)
+#ifdef CONFIG_IRQCHIP
+static int misc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
 {
-	ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_WMAC);
-	do_IRQ(ATH79_CPU_IRQ(2));
+	irq_set_chip_and_handler(irq, &ath79_misc_irq_chip, handle_level_irq);
+	return 0;
 }
 
-static void ar71xx_ip3_handler(void)
-{
-	ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_USB);
-	do_IRQ(ATH79_CPU_IRQ(3));
-}
+static const struct irq_domain_ops misc_irq_domain_ops = {
+	.xlate = irq_domain_xlate_onecell,
+	.map = misc_map,
+};
 
-static void ar724x_ip3_handler(void)
+static int __init ath79_misc_intc_of_init(
+	struct device_node *node, struct device_node *parent)
 {
-	ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_USB);
-	do_IRQ(ATH79_CPU_IRQ(3));
+	void __iomem *base = ath79_reset_base;
+	struct irq_domain *domain;
+	int irq;
+
+	irq = irq_of_parse_and_map(node, 0);
+	if (!irq)
+		panic("Failed to get MISC IRQ");
+
+	domain = irq_domain_add_legacy(node, ATH79_MISC_IRQ_COUNT,
+			ATH79_MISC_IRQ_BASE, 0, &misc_irq_domain_ops, NULL);
+	if (!domain)
+		panic("Failed to add MISC irqdomain");
+
+	/* Disable and clear all interrupts */
+	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
+	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);
+
+
+	irq_set_chained_handler(irq, ath79_misc_irq_handler);
+
+	return 0;
 }
 
-static void ar913x_ip3_handler(void)
+static int __init ar7100_misc_intc_of_init(
+	struct device_node *node, struct device_node *parent)
 {
-	ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_USB);
-	do_IRQ(ATH79_CPU_IRQ(3));
+	ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
+	return ath79_misc_intc_of_init(node, parent);
 }
 
-static void ar933x_ip3_handler(void)
+IRQCHIP_DECLARE(ar7100_misc_intc, "qca,ar7100-misc-intc",
+		ar7100_misc_intc_of_init);
+
+static int __init ar7240_misc_intc_of_init(
+	struct device_node *node, struct device_node *parent)
 {
-	ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_USB);
-	do_IRQ(ATH79_CPU_IRQ(3));
+	ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
+	return ath79_misc_intc_of_init(node, parent);
 }
 
-static void ar934x_ip3_handler(void)
+IRQCHIP_DECLARE(ar7240_misc_intc, "qca,ar7240-misc-intc",
+		ar7240_misc_intc_of_init);
+
+static int __init ar79_cpu_intc_of_init(
+	struct device_node *node, struct device_node *parent)
 {
-	ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_USB);
-	do_IRQ(ATH79_CPU_IRQ(3));
+	int err, i, count;
+
+	/* Fill the irq_wb_chan table */
+	count = of_count_phandle_with_args(
+		node, "qca,ddr-wb-channels", "#qca,ddr-wb-channel-cells");
+
+	for (i = 0; i < count; i++) {
+		struct of_phandle_args args;
+		u32 irq = i;
+
+		of_property_read_u32_index(
+			node, "qca,ddr-wb-channel-interrupts", i, &irq);
+		if (irq >= ARRAY_SIZE(irq_wb_chan))
+			continue;
+
+		err = of_parse_phandle_with_args(
+			node, "qca,ddr-wb-channels",
+			"#qca,ddr-wb-channel-cells",
+			i, &args);
+		if (err)
+			return err;
+
+		irq_wb_chan[irq] = args.args[0];
+		pr_info("IRQ: Set flush channel of IRQ%d to %d\n",
+			irq, args.args[0]);
+	}
+
+	return mips_cpu_irq_of_init(node, parent);
 }
+IRQCHIP_DECLARE(ar79_cpu_intc, "qca,ar7100-cpu-intc",
+		ar79_cpu_intc_of_init);
+
+#endif
 
 void __init arch_init_irq(void)
 {
-	if (soc_is_ar71xx()) {
-		ath79_ip2_handler = ar71xx_ip2_handler;
-		ath79_ip3_handler = ar71xx_ip3_handler;
-	} else if (soc_is_ar724x()) {
-		ath79_ip2_handler = ar724x_ip2_handler;
-		ath79_ip3_handler = ar724x_ip3_handler;
-	} else if (soc_is_ar913x()) {
-		ath79_ip2_handler = ar913x_ip2_handler;
-		ath79_ip3_handler = ar913x_ip3_handler;
-	} else if (soc_is_ar933x()) {
-		ath79_ip2_handler = ar933x_ip2_handler;
-		ath79_ip3_handler = ar933x_ip3_handler;
+	if (mips_machtype == ATH79_MACH_GENERIC_OF) {
+		irqchip_init();
+		return;
+	}
+
+	if (soc_is_ar71xx() || soc_is_ar724x() ||
+	    soc_is_ar913x() || soc_is_ar933x()) {
+		irq_wb_chan[2] = 3;
+		irq_wb_chan[3] = 2;
 	} else if (soc_is_ar934x()) {
-		ath79_ip2_handler = ath79_default_ip2_handler;
-		ath79_ip3_handler = ar934x_ip3_handler;
-	} else if (soc_is_qca955x()) {
-		ath79_ip2_handler = ath79_default_ip2_handler;
-		ath79_ip3_handler = ath79_default_ip3_handler;
-	} else {
-		BUG();
+		irq_wb_chan[3] = 2;
 	}
 
 	mips_cpu_irq_init();
diff --git a/kernel/arch/mips/ath79/machtypes.h b/kernel/arch/mips/ath79/machtypes.h
index 26254058c..a13db3d15 100644
--- a/kernel/arch/mips/ath79/machtypes.h
+++ b/kernel/arch/mips/ath79/machtypes.h
@@ -15,6 +15,7 @@
 #include <asm/mips_machine.h>
 
 enum ath79_mach_type {
+	ATH79_MACH_GENERIC_OF = -1,	/* Device tree board */
 	ATH79_MACH_GENERIC = 0,
 	ATH79_MACH_AP121,		/* Atheros AP121 reference board */
 	ATH79_MACH_AP136_010,		/* Atheros AP136-010 reference board */
diff --git a/kernel/arch/mips/ath79/setup.c b/kernel/arch/mips/ath79/setup.c
index fd2a36a79..8755d618e 100644
--- a/kernel/arch/mips/ath79/setup.c
+++ b/kernel/arch/mips/ath79/setup.c
@@ -17,12 +17,16 @@
 #include <linux/bootmem.h>
 #include <linux/err.h>
 #include <linux/clk.h>
+#include <linux/of_platform.h>
+#include <linux/of_fdt.h>
 
 #include <asm/bootinfo.h>
 #include <asm/idle.h>
 #include <asm/time.h>		/* for mips_hpt_frequency */
 #include <asm/reboot.h>		/* for _machine_{restart,halt} */
 #include <asm/mips_machine.h>
+#include <asm/prom.h>
+#include <asm/fw/fw.h>
 
 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/ar71xx_regs.h>
@@ -195,17 +199,28 @@ unsigned int get_c0_compare_int(void)
 
 void __init plat_mem_setup(void)
 {
+	unsigned long fdt_start;
+
 	set_io_port_base(KSEG1);
 
+	/* Get the position of the FDT passed by the bootloader */
+	fdt_start = fw_getenvl("fdt_start");
+	if (fdt_start)
+		__dt_setup_arch((void *)KSEG0ADDR(fdt_start));
+#ifdef CONFIG_BUILTIN_DTB
+	else
+		__dt_setup_arch(__dtb_start);
+#endif
+
 	ath79_reset_base = ioremap_nocache(AR71XX_RESET_BASE,
 					   AR71XX_RESET_SIZE);
 	ath79_pll_base = ioremap_nocache(AR71XX_PLL_BASE,
 					 AR71XX_PLL_SIZE);
-	ath79_ddr_base = ioremap_nocache(AR71XX_DDR_CTRL_BASE,
-					 AR71XX_DDR_CTRL_SIZE);
-
 	ath79_detect_sys_type();
-	detect_memory_region(0, ATH79_MEM_SIZE_MIN, ATH79_MEM_SIZE_MAX);
+	ath79_ddr_ctrl_init();
+
+	if (mips_machtype != ATH79_MACH_GENERIC_OF)
+		detect_memory_region(0, ATH79_MEM_SIZE_MIN, ATH79_MEM_SIZE_MAX);
 
 	_machine_restart = ath79_restart;
 	_machine_halt = ath79_halt;
@@ -237,6 +252,10 @@ void __init plat_time_init(void)
 
 static int __init ath79_setup(void)
 {
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+	if  (mips_machtype == ATH79_MACH_GENERIC_OF)
+		return 0;
+
 	ath79_gpio_init();
 	ath79_register_uart();
 	ath79_register_wdt();
@@ -248,6 +267,11 @@ static int __init ath79_setup(void)
 
 arch_initcall(ath79_setup);
 
+void __init device_tree_init(void)
+{
+	unflatten_and_copy_device_tree();
+}
+
 static void __init ath79_generic_init(void)
 {
 	/* Nothing to do */
@@ -257,3 +281,8 @@ MIPS_MACHINE(ATH79_MACH_GENERIC,
 	     "Generic",
 	     "Generic AR71XX/AR724X/AR913X based board",
 	     ath79_generic_init);
+
+MIPS_MACHINE(ATH79_MACH_GENERIC_OF,
+	     "DTB",
+	     "Generic AR71XX/AR724X/AR913X based board (DT)",
+	     NULL);