Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

18 files changed, 2355 insertions, 0 deletions

diff --git a/kernel/arch/mips/ralink/Kconfig b/kernel/arch/mips/ralink/Kconfig
new file mode 100644
index 000000000..e9bc8c961
--- /dev/null
+++ b/kernel/arch/mips/ralink/Kconfig
@@ -0,0 +1,70 @@
+if RALINK
+
+config CLKEVT_RT3352
+	bool
+	depends on SOC_RT305X || SOC_MT7620
+	default y
+	select CLKSRC_OF
+	select CLKSRC_MMIO
+
+config RALINK_ILL_ACC
+	bool
+	depends on SOC_RT305X
+	default y
+
+choice
+	prompt "Ralink SoC selection"
+	default SOC_RT305X
+	help
+	  Select Ralink MIPS SoC type.
+
+	config SOC_RT288X
+		bool "RT288x"
+		select MIPS_L1_CACHE_SHIFT_4
+		select HW_HAS_PCI
+
+	config SOC_RT305X
+		bool "RT305x"
+		select USB_ARCH_HAS_HCD
+
+	config SOC_RT3883
+		bool "RT3883"
+		select HW_HAS_PCI
+
+	config SOC_MT7620
+		bool "MT7620/8"
+
+endchoice
+
+choice
+	prompt "Devicetree selection"
+	default DTB_RT_NONE
+	help
+	  Select the devicetree.
+
+	config DTB_RT_NONE
+		bool "None"
+
+	config DTB_RT2880_EVAL
+		bool "RT2880 eval kit"
+		depends on SOC_RT288X
+		select BUILTIN_DTB
+
+	config DTB_RT305X_EVAL
+		bool "RT305x eval kit"
+		depends on SOC_RT305X
+		select BUILTIN_DTB
+
+	config DTB_RT3883_EVAL
+		bool "RT3883 eval kit"
+		depends on SOC_RT3883
+		select BUILTIN_DTB
+
+	config DTB_MT7620A_EVAL
+		bool "MT7620A eval kit"
+		depends on SOC_MT7620
+		select BUILTIN_DTB
+
+endchoice
+
+endif
diff --git a/kernel/arch/mips/ralink/Makefile b/kernel/arch/mips/ralink/Makefile
new file mode 100644
index 000000000..a6c9d0061
--- /dev/null
+++ b/kernel/arch/mips/ralink/Makefile
@@ -0,0 +1,22 @@
+# 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.#
+# Makefile for the Ralink common stuff
+#
+# Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
+# Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+
+obj-y := prom.o of.o reset.o clk.o irq.o timer.o
+
+obj-$(CONFIG_CLKEVT_RT3352) += cevt-rt3352.o
+
+obj-$(CONFIG_RALINK_ILL_ACC) += ill_acc.o
+
+obj-$(CONFIG_SOC_RT288X) += rt288x.o
+obj-$(CONFIG_SOC_RT305X) += rt305x.o
+obj-$(CONFIG_SOC_RT3883) += rt3883.o
+obj-$(CONFIG_SOC_MT7620) += mt7620.o
+
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+
+obj-$(CONFIG_DEBUG_FS) += bootrom.o
diff --git a/kernel/arch/mips/ralink/Platform b/kernel/arch/mips/ralink/Platform
new file mode 100644
index 000000000..6d9c8c499
--- /dev/null
+++ b/kernel/arch/mips/ralink/Platform
@@ -0,0 +1,29 @@
+#
+# Ralink SoC common stuff
+#
+core-$(CONFIG_RALINK)		+= arch/mips/ralink/
+cflags-$(CONFIG_RALINK)		+= -I$(srctree)/arch/mips/include/asm/mach-ralink
+
+#
+# Ralink RT288x
+#
+load-$(CONFIG_SOC_RT288X)	+= 0xffffffff88000000
+cflags-$(CONFIG_SOC_RT288X)	+= -I$(srctree)/arch/mips/include/asm/mach-ralink/rt288x
+
+#
+# Ralink RT305x
+#
+load-$(CONFIG_SOC_RT305X)	+= 0xffffffff80000000
+cflags-$(CONFIG_SOC_RT305X)	+= -I$(srctree)/arch/mips/include/asm/mach-ralink/rt305x
+
+#
+# Ralink RT3883
+#
+load-$(CONFIG_SOC_RT3883)	+= 0xffffffff80000000
+cflags-$(CONFIG_SOC_RT3883)	+= -I$(srctree)/arch/mips/include/asm/mach-ralink/rt3883
+
+#
+# Ralink MT7620
+#
+load-$(CONFIG_SOC_MT7620)	+= 0xffffffff80000000
+cflags-$(CONFIG_SOC_MT7620)	+= -I$(srctree)/arch/mips/include/asm/mach-ralink/mt7620
diff --git a/kernel/arch/mips/ralink/bootrom.c b/kernel/arch/mips/ralink/bootrom.c
new file mode 100644
index 000000000..540346839
--- /dev/null
+++ b/kernel/arch/mips/ralink/bootrom.c
@@ -0,0 +1,48 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#define BOOTROM_OFFSET	0x10118000
+#define BOOTROM_SIZE	0x8000
+
+static void __iomem *membase = (void __iomem *) KSEG1ADDR(BOOTROM_OFFSET);
+
+static int bootrom_show(struct seq_file *s, void *unused)
+{
+	seq_write(s, membase, BOOTROM_SIZE);
+
+	return 0;
+}
+
+static int bootrom_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, bootrom_show, NULL);
+}
+
+static const struct file_operations bootrom_file_ops = {
+	.open		= bootrom_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int bootrom_setup(void)
+{
+	if (!debugfs_create_file("bootrom", 0444,
+			NULL, NULL, &bootrom_file_ops)) {
+		pr_err("Failed to create bootrom debugfs file\n");
+
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+postcore_initcall(bootrom_setup);
diff --git a/kernel/arch/mips/ralink/cevt-rt3352.c b/kernel/arch/mips/ralink/cevt-rt3352.c
new file mode 100644
index 000000000..24bf057a3
--- /dev/null
+++ b/kernel/arch/mips/ralink/cevt-rt3352.c
@@ -0,0 +1,145 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2013 by John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/interrupt.h>
+#include <linux/reset.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+#define SYSTICK_FREQ		(50 * 1000)
+
+#define SYSTICK_CONFIG		0x00
+#define SYSTICK_COMPARE		0x04
+#define SYSTICK_COUNT		0x08
+
+/* route systick irq to mips irq 7 instead of the r4k-timer */
+#define CFG_EXT_STK_EN		0x2
+/* enable the counter */
+#define CFG_CNT_EN		0x1
+
+struct systick_device {
+	void __iomem *membase;
+	struct clock_event_device dev;
+	int irq_requested;
+	int freq_scale;
+};
+
+static void systick_set_clock_mode(enum clock_event_mode mode,
+				struct clock_event_device *evt);
+
+static int systick_next_event(unsigned long delta,
+				struct clock_event_device *evt)
+{
+	struct systick_device *sdev;
+	u32 count;
+
+	sdev = container_of(evt, struct systick_device, dev);
+	count = ioread32(sdev->membase + SYSTICK_COUNT);
+	count = (count + delta) % SYSTICK_FREQ;
+	iowrite32(count + delta, sdev->membase + SYSTICK_COMPARE);
+
+	return 0;
+}
+
+static void systick_event_handler(struct clock_event_device *dev)
+{
+	/* noting to do here */
+}
+
+static irqreturn_t systick_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *dev = (struct clock_event_device *) dev_id;
+
+	dev->event_handler(dev);
+
+	return IRQ_HANDLED;
+}
+
+static struct systick_device systick = {
+	.dev = {
+		/*
+		 * cevt-r4k uses 300, make sure systick
+		 * gets used if available
+		 */
+		.rating		= 310,
+		.features	= CLOCK_EVT_FEAT_ONESHOT,
+		.set_next_event	= systick_next_event,
+		.set_mode	= systick_set_clock_mode,
+		.event_handler	= systick_event_handler,
+	},
+};
+
+static struct irqaction systick_irqaction = {
+	.handler = systick_interrupt,
+	.flags = IRQF_PERCPU | IRQF_TIMER,
+	.dev_id = &systick.dev,
+};
+
+static void systick_set_clock_mode(enum clock_event_mode mode,
+				struct clock_event_device *evt)
+{
+	struct systick_device *sdev;
+
+	sdev = container_of(evt, struct systick_device, dev);
+
+	switch (mode) {
+	case CLOCK_EVT_MODE_ONESHOT:
+		if (!sdev->irq_requested)
+			setup_irq(systick.dev.irq, &systick_irqaction);
+		sdev->irq_requested = 1;
+		iowrite32(CFG_EXT_STK_EN | CFG_CNT_EN,
+				systick.membase + SYSTICK_CONFIG);
+		break;
+
+	case CLOCK_EVT_MODE_SHUTDOWN:
+		if (sdev->irq_requested)
+			free_irq(systick.dev.irq, &systick_irqaction);
+		sdev->irq_requested = 0;
+		iowrite32(0, systick.membase + SYSTICK_CONFIG);
+		break;
+
+	default:
+		pr_err("%s: Unhandeled mips clock_mode\n", systick.dev.name);
+		break;
+	}
+}
+
+static void __init ralink_systick_init(struct device_node *np)
+{
+	systick.membase = of_iomap(np, 0);
+	if (!systick.membase)
+		return;
+
+	systick_irqaction.name = np->name;
+	systick.dev.name = np->name;
+	clockevents_calc_mult_shift(&systick.dev, SYSTICK_FREQ, 60);
+	systick.dev.max_delta_ns = clockevent_delta2ns(0x7fff, &systick.dev);
+	systick.dev.min_delta_ns = clockevent_delta2ns(0x3, &systick.dev);
+	systick.dev.irq = irq_of_parse_and_map(np, 0);
+	if (!systick.dev.irq) {
+		pr_err("%s: request_irq failed", np->name);
+		return;
+	}
+
+	clocksource_mmio_init(systick.membase + SYSTICK_COUNT, np->name,
+			SYSTICK_FREQ, 301, 16, clocksource_mmio_readl_up);
+
+	clockevents_register_device(&systick.dev);
+
+	pr_info("%s: running - mult: %d, shift: %d\n",
+			np->name, systick.dev.mult, systick.dev.shift);
+}
+
+CLOCKSOURCE_OF_DECLARE(systick, "ralink,cevt-systick", ralink_systick_init);
diff --git a/kernel/arch/mips/ralink/clk.c b/kernel/arch/mips/ralink/clk.c
new file mode 100644
index 000000000..feb5a9bf9
--- /dev/null
+++ b/kernel/arch/mips/ralink/clk.c
@@ -0,0 +1,79 @@
+/*
+ *  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.
+ *
+ *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/clkdev.h>
+#include <linux/clk.h>
+
+#include <asm/time.h>
+
+#include "common.h"
+
+struct clk {
+	struct clk_lookup cl;
+	unsigned long rate;
+};
+
+void ralink_clk_add(const char *dev, unsigned long rate)
+{
+	struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
+
+	if (!clk)
+		panic("failed to add clock");
+
+	clk->cl.dev_id = dev;
+	clk->cl.clk = clk;
+
+	clk->rate = rate;
+
+	clkdev_add(&clk->cl);
+}
+
+/*
+ * Linux clock API
+ */
+int clk_enable(struct clk *clk)
+{
+	return 0;
+}
+EXPORT_SYMBOL_GPL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+}
+EXPORT_SYMBOL_GPL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	return clk->rate;
+}
+EXPORT_SYMBOL_GPL(clk_get_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	return -1;
+}
+EXPORT_SYMBOL_GPL(clk_set_rate);
+
+void __init plat_time_init(void)
+{
+	struct clk *clk;
+
+	ralink_of_remap();
+
+	ralink_clk_init();
+	clk = clk_get_sys("cpu", NULL);
+	if (IS_ERR(clk))
+		panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
+	pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
+	mips_hpt_frequency = clk_get_rate(clk) / 2;
+	clk_put(clk);
+	clocksource_of_init();
+}
diff --git a/kernel/arch/mips/ralink/common.h b/kernel/arch/mips/ralink/common.h
new file mode 100644
index 000000000..8e7d8e618
--- /dev/null
+++ b/kernel/arch/mips/ralink/common.h
@@ -0,0 +1,36 @@
+/*
+ *  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.
+ *
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#ifndef _RALINK_COMMON_H__
+#define _RALINK_COMMON_H__
+
+#define RAMIPS_SYS_TYPE_LEN	32
+
+struct ralink_soc_info {
+	unsigned char sys_type[RAMIPS_SYS_TYPE_LEN];
+	unsigned char *compatible;
+
+	unsigned long mem_base;
+	unsigned long mem_size;
+	unsigned long mem_size_min;
+	unsigned long mem_size_max;
+};
+extern struct ralink_soc_info soc_info;
+
+extern void ralink_of_remap(void);
+
+extern void ralink_clk_init(void);
+extern void ralink_clk_add(const char *dev, unsigned long rate);
+
+extern void ralink_rst_init(void);
+
+extern void prom_soc_init(struct ralink_soc_info *soc_info);
+
+__iomem void *plat_of_remap_node(const char *node);
+
+#endif /* _RALINK_COMMON_H__ */
diff --git a/kernel/arch/mips/ralink/early_printk.c b/kernel/arch/mips/ralink/early_printk.c
new file mode 100644
index 000000000..255d695ec
--- /dev/null
+++ b/kernel/arch/mips/ralink/early_printk.c
@@ -0,0 +1,63 @@
+/*
+ *  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.
+ *
+ *  Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
+ */
+
+#include <linux/io.h>
+#include <linux/serial_reg.h>
+
+#include <asm/addrspace.h>
+
+#ifdef CONFIG_SOC_RT288X
+#define EARLY_UART_BASE		0x300c00
+#define CHIPID_BASE		0x300004
+#elif defined(CONFIG_SOC_MT7621)
+#define EARLY_UART_BASE		0x1E000c00
+#define CHIPID_BASE		0x1E000004
+#else
+#define EARLY_UART_BASE		0x10000c00
+#define CHIPID_BASE		0x10000004
+#endif
+
+#define MT7628_CHIP_NAME1	0x20203832
+
+#define UART_REG_TX		0x04
+#define UART_REG_LSR		0x14
+#define UART_REG_LSR_RT2880	0x1c
+
+static __iomem void *uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE);
+static __iomem void *chipid_membase = (__iomem void *) KSEG1ADDR(CHIPID_BASE);
+
+static inline void uart_w32(u32 val, unsigned reg)
+{
+	__raw_writel(val, uart_membase + reg);
+}
+
+static inline u32 uart_r32(unsigned reg)
+{
+	return __raw_readl(uart_membase + reg);
+}
+
+static inline int soc_is_mt7628(void)
+{
+	return IS_ENABLED(CONFIG_SOC_MT7620) &&
+		(__raw_readl(chipid_membase) == MT7628_CHIP_NAME1);
+}
+
+void prom_putchar(unsigned char ch)
+{
+	if (IS_ENABLED(CONFIG_SOC_MT7621) || soc_is_mt7628()) {
+		uart_w32(ch, UART_TX);
+		while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
+			;
+	} else {
+		while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)
+			;
+		uart_w32(ch, UART_REG_TX);
+		while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)
+			;
+	}
+}
diff --git a/kernel/arch/mips/ralink/ill_acc.c b/kernel/arch/mips/ralink/ill_acc.c
new file mode 100644
index 000000000..e10d10b9e
--- /dev/null
+++ b/kernel/arch/mips/ralink/ill_acc.c
@@ -0,0 +1,87 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/interrupt.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+#define REG_ILL_ACC_ADDR	0x10
+#define REG_ILL_ACC_TYPE	0x14
+
+#define ILL_INT_STATUS		BIT(31)
+#define ILL_ACC_WRITE		BIT(30)
+#define ILL_ACC_LEN_M		0xff
+#define ILL_ACC_OFF_M		0xf
+#define ILL_ACC_OFF_S		16
+#define ILL_ACC_ID_M		0x7
+#define ILL_ACC_ID_S		8
+
+#define	DRV_NAME		"ill_acc"
+
+static const char * const ill_acc_ids[] = {
+	"cpu", "dma", "ppe", "pdma rx", "pdma tx", "pci/e", "wmac", "usb",
+};
+
+static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
+{
+	struct device *dev = (struct device *) _priv;
+	u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
+	u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
+
+	dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
+		(type & ILL_ACC_WRITE) ? ("write") : ("read"),
+		ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
+		addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
+		type & ILL_ACC_LEN_M);
+
+	rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
+
+	return IRQ_HANDLED;
+}
+
+static int __init ill_acc_of_setup(void)
+{
+	struct platform_device *pdev;
+	struct device_node *np;
+	int irq;
+
+	/* somehow this driver breaks on RT5350 */
+	if (of_machine_is_compatible("ralink,rt5350-soc"))
+		return -EINVAL;
+
+	np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
+	if (!np)
+		return -EINVAL;
+
+	pdev = of_find_device_by_node(np);
+	if (!pdev) {
+		pr_err("%s: failed to lookup pdev\n", np->name);
+		return -EINVAL;
+	}
+
+	irq = irq_of_parse_and_map(np, 0);
+	if (!irq) {
+		dev_err(&pdev->dev, "failed to get irq\n");
+		return -EINVAL;
+	}
+
+	if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
+		dev_err(&pdev->dev, "failed to request irq\n");
+		return -EINVAL;
+	}
+
+	rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
+
+	dev_info(&pdev->dev, "irq registered\n");
+
+	return 0;
+}
+
+arch_initcall(ill_acc_of_setup);
diff --git a/kernel/arch/mips/ralink/irq.c b/kernel/arch/mips/ralink/irq.c
new file mode 100644
index 000000000..7cf91b92e
--- /dev/null
+++ b/kernel/arch/mips/ralink/irq.c
@@ -0,0 +1,206 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/io.h>
+#include <linux/bitops.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/interrupt.h>
+
+#include <asm/irq_cpu.h>
+#include <asm/mipsregs.h>
+
+#include "common.h"
+
+#define INTC_INT_GLOBAL		BIT(31)
+
+#define RALINK_CPU_IRQ_INTC	(MIPS_CPU_IRQ_BASE + 2)
+#define RALINK_CPU_IRQ_PCI	(MIPS_CPU_IRQ_BASE + 4)
+#define RALINK_CPU_IRQ_FE	(MIPS_CPU_IRQ_BASE + 5)
+#define RALINK_CPU_IRQ_WIFI	(MIPS_CPU_IRQ_BASE + 6)
+#define RALINK_CPU_IRQ_COUNTER	(MIPS_CPU_IRQ_BASE + 7)
+
+/* we have a cascade of 8 irqs */
+#define RALINK_INTC_IRQ_BASE	8
+
+/* we have 32 SoC irqs */
+#define RALINK_INTC_IRQ_COUNT	32
+
+#define RALINK_INTC_IRQ_PERFC   (RALINK_INTC_IRQ_BASE + 9)
+
+enum rt_intc_regs_enum {
+	INTC_REG_STATUS0 = 0,
+	INTC_REG_STATUS1,
+	INTC_REG_TYPE,
+	INTC_REG_RAW_STATUS,
+	INTC_REG_ENABLE,
+	INTC_REG_DISABLE,
+};
+
+static u32 rt_intc_regs[] = {
+	[INTC_REG_STATUS0] = 0x00,
+	[INTC_REG_STATUS1] = 0x04,
+	[INTC_REG_TYPE] = 0x20,
+	[INTC_REG_RAW_STATUS] = 0x30,
+	[INTC_REG_ENABLE] = 0x34,
+	[INTC_REG_DISABLE] = 0x38,
+};
+
+static void __iomem *rt_intc_membase;
+
+static int rt_perfcount_irq;
+
+static inline void rt_intc_w32(u32 val, unsigned reg)
+{
+	__raw_writel(val, rt_intc_membase + rt_intc_regs[reg]);
+}
+
+static inline u32 rt_intc_r32(unsigned reg)
+{
+	return __raw_readl(rt_intc_membase + rt_intc_regs[reg]);
+}
+
+static void ralink_intc_irq_unmask(struct irq_data *d)
+{
+	rt_intc_w32(BIT(d->hwirq), INTC_REG_ENABLE);
+}
+
+static void ralink_intc_irq_mask(struct irq_data *d)
+{
+	rt_intc_w32(BIT(d->hwirq), INTC_REG_DISABLE);
+}
+
+static struct irq_chip ralink_intc_irq_chip = {
+	.name		= "INTC",
+	.irq_unmask	= ralink_intc_irq_unmask,
+	.irq_mask	= ralink_intc_irq_mask,
+	.irq_mask_ack	= ralink_intc_irq_mask,
+};
+
+int get_c0_perfcount_int(void)
+{
+	return rt_perfcount_irq;
+}
+
+unsigned int get_c0_compare_int(void)
+{
+	return CP0_LEGACY_COMPARE_IRQ;
+}
+
+static void ralink_intc_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	u32 pending = rt_intc_r32(INTC_REG_STATUS0);
+
+	if (pending) {
+		struct irq_domain *domain = irq_get_handler_data(irq);
+		generic_handle_irq(irq_find_mapping(domain, __ffs(pending)));
+	} else {
+		spurious_interrupt();
+	}
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+	unsigned long pending;
+
+	pending = read_c0_status() & read_c0_cause() & ST0_IM;
+
+	if (pending & STATUSF_IP7)
+		do_IRQ(RALINK_CPU_IRQ_COUNTER);
+
+	else if (pending & STATUSF_IP5)
+		do_IRQ(RALINK_CPU_IRQ_FE);
+
+	else if (pending & STATUSF_IP6)
+		do_IRQ(RALINK_CPU_IRQ_WIFI);
+
+	else if (pending & STATUSF_IP4)
+		do_IRQ(RALINK_CPU_IRQ_PCI);
+
+	else if (pending & STATUSF_IP2)
+		do_IRQ(RALINK_CPU_IRQ_INTC);
+
+	else
+		spurious_interrupt();
+}
+
+static int intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+{
+	irq_set_chip_and_handler(irq, &ralink_intc_irq_chip, handle_level_irq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops irq_domain_ops = {
+	.xlate = irq_domain_xlate_onecell,
+	.map = intc_map,
+};
+
+static int __init intc_of_init(struct device_node *node,
+			       struct device_node *parent)
+{
+	struct resource res;
+	struct irq_domain *domain;
+	int irq;
+
+	if (!of_property_read_u32_array(node, "ralink,intc-registers",
+					rt_intc_regs, 6))
+		pr_info("intc: using register map from devicetree\n");
+
+	irq = irq_of_parse_and_map(node, 0);
+	if (!irq)
+		panic("Failed to get INTC IRQ");
+
+	if (of_address_to_resource(node, 0, &res))
+		panic("Failed to get intc memory range");
+
+	if (request_mem_region(res.start, resource_size(&res),
+				res.name) < 0)
+		pr_err("Failed to request intc memory");
+
+	rt_intc_membase = ioremap_nocache(res.start,
+					resource_size(&res));
+	if (!rt_intc_membase)
+		panic("Failed to remap intc memory");
+
+	/* disable all interrupts */
+	rt_intc_w32(~0, INTC_REG_DISABLE);
+
+	/* route all INTC interrupts to MIPS HW0 interrupt */
+	rt_intc_w32(0, INTC_REG_TYPE);
+
+	domain = irq_domain_add_legacy(node, RALINK_INTC_IRQ_COUNT,
+			RALINK_INTC_IRQ_BASE, 0, &irq_domain_ops, NULL);
+	if (!domain)
+		panic("Failed to add irqdomain");
+
+	rt_intc_w32(INTC_INT_GLOBAL, INTC_REG_ENABLE);
+
+	irq_set_chained_handler(irq, ralink_intc_irq_handler);
+	irq_set_handler_data(irq, domain);
+
+	/* tell the kernel which irq is used for performance monitoring */
+	rt_perfcount_irq = irq_create_mapping(domain, 9);
+
+	return 0;
+}
+
+static struct of_device_id __initdata of_irq_ids[] = {
+	{ .compatible = "mti,cpu-interrupt-controller", .data = mips_cpu_irq_of_init },
+	{ .compatible = "ralink,rt2880-intc", .data = intc_of_init },
+	{},
+};
+
+void __init arch_init_irq(void)
+{
+	of_irq_init(of_irq_ids);
+}
+
diff --git a/kernel/arch/mips/ralink/mt7620.c b/kernel/arch/mips/ralink/mt7620.c
new file mode 100644
index 000000000..2ea5ff6dc
--- /dev/null
+++ b/kernel/arch/mips/ralink/mt7620.c
@@ -0,0 +1,548 @@
+/*
+ * 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.
+ *
+ * Parts of this file are based on Ralink's 2.6.21 BSP
+ *
+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/mipsregs.h>
+#include <asm/mach-ralink/ralink_regs.h>
+#include <asm/mach-ralink/mt7620.h>
+#include <asm/mach-ralink/pinmux.h>
+
+#include "common.h"
+
+/* analog */
+#define PMU0_CFG		0x88
+#define PMU_SW_SET		BIT(28)
+#define A_DCDC_EN		BIT(24)
+#define A_SSC_PERI		BIT(19)
+#define A_SSC_GEN		BIT(18)
+#define A_SSC_M			0x3
+#define A_SSC_S			16
+#define A_DLY_M			0x7
+#define A_DLY_S			8
+#define A_VTUNE_M		0xff
+
+/* digital */
+#define PMU1_CFG		0x8C
+#define DIG_SW_SEL		BIT(25)
+
+/* is this a MT7620 or a MT7628 */
+enum mt762x_soc_type mt762x_soc;
+
+/* does the board have sdram or ddram */
+static int dram_type;
+
+static struct rt2880_pmx_func i2c_grp[] =  { FUNC("i2c", 0, 1, 2) };
+static struct rt2880_pmx_func spi_grp[] = { FUNC("spi", 0, 3, 4) };
+static struct rt2880_pmx_func uartlite_grp[] = { FUNC("uartlite", 0, 15, 2) };
+static struct rt2880_pmx_func mdio_grp[] = { FUNC("mdio", 0, 22, 2) };
+static struct rt2880_pmx_func rgmii1_grp[] = { FUNC("rgmii1", 0, 24, 12) };
+static struct rt2880_pmx_func refclk_grp[] = { FUNC("spi refclk", 0, 37, 3) };
+static struct rt2880_pmx_func ephy_grp[] = { FUNC("ephy", 0, 40, 5) };
+static struct rt2880_pmx_func rgmii2_grp[] = { FUNC("rgmii2", 0, 60, 12) };
+static struct rt2880_pmx_func wled_grp[] = { FUNC("wled", 0, 72, 1) };
+static struct rt2880_pmx_func pa_grp[] = { FUNC("pa", 0, 18, 4) };
+static struct rt2880_pmx_func uartf_grp[] = {
+	FUNC("uartf", MT7620_GPIO_MODE_UARTF, 7, 8),
+	FUNC("pcm uartf", MT7620_GPIO_MODE_PCM_UARTF, 7, 8),
+	FUNC("pcm i2s", MT7620_GPIO_MODE_PCM_I2S, 7, 8),
+	FUNC("i2s uartf", MT7620_GPIO_MODE_I2S_UARTF, 7, 8),
+	FUNC("pcm gpio", MT7620_GPIO_MODE_PCM_GPIO, 11, 4),
+	FUNC("gpio uartf", MT7620_GPIO_MODE_GPIO_UARTF, 7, 4),
+	FUNC("gpio i2s", MT7620_GPIO_MODE_GPIO_I2S, 7, 4),
+};
+static struct rt2880_pmx_func wdt_grp[] = {
+	FUNC("wdt rst", 0, 17, 1),
+	FUNC("wdt refclk", 0, 17, 1),
+	};
+static struct rt2880_pmx_func pcie_rst_grp[] = {
+	FUNC("pcie rst", MT7620_GPIO_MODE_PCIE_RST, 36, 1),
+	FUNC("pcie refclk", MT7620_GPIO_MODE_PCIE_REF, 36, 1)
+};
+static struct rt2880_pmx_func nd_sd_grp[] = {
+	FUNC("nand", MT7620_GPIO_MODE_NAND, 45, 15),
+	FUNC("sd", MT7620_GPIO_MODE_SD, 45, 15)
+};
+
+static struct rt2880_pmx_group mt7620a_pinmux_data[] = {
+	GRP("i2c", i2c_grp, 1, MT7620_GPIO_MODE_I2C),
+	GRP("uartf", uartf_grp, MT7620_GPIO_MODE_UART0_MASK,
+		MT7620_GPIO_MODE_UART0_SHIFT),
+	GRP("spi", spi_grp, 1, MT7620_GPIO_MODE_SPI),
+	GRP("uartlite", uartlite_grp, 1, MT7620_GPIO_MODE_UART1),
+	GRP_G("wdt", wdt_grp, MT7620_GPIO_MODE_WDT_MASK,
+		MT7620_GPIO_MODE_WDT_GPIO, MT7620_GPIO_MODE_WDT_SHIFT),
+	GRP("mdio", mdio_grp, 1, MT7620_GPIO_MODE_MDIO),
+	GRP("rgmii1", rgmii1_grp, 1, MT7620_GPIO_MODE_RGMII1),
+	GRP("spi refclk", refclk_grp, 1, MT7620_GPIO_MODE_SPI_REF_CLK),
+	GRP_G("pcie", pcie_rst_grp, MT7620_GPIO_MODE_PCIE_MASK,
+		MT7620_GPIO_MODE_PCIE_GPIO, MT7620_GPIO_MODE_PCIE_SHIFT),
+	GRP_G("nd_sd", nd_sd_grp, MT7620_GPIO_MODE_ND_SD_MASK,
+		MT7620_GPIO_MODE_ND_SD_GPIO, MT7620_GPIO_MODE_ND_SD_SHIFT),
+	GRP("rgmii2", rgmii2_grp, 1, MT7620_GPIO_MODE_RGMII2),
+	GRP("wled", wled_grp, 1, MT7620_GPIO_MODE_WLED),
+	GRP("ephy", ephy_grp, 1, MT7620_GPIO_MODE_EPHY),
+	GRP("pa", pa_grp, 1, MT7620_GPIO_MODE_PA),
+	{ 0 }
+};
+
+static struct rt2880_pmx_func pwm1_grp_mt7628[] = {
+	FUNC("sdcx", 3, 19, 1),
+	FUNC("utif", 2, 19, 1),
+	FUNC("gpio", 1, 19, 1),
+	FUNC("pwm", 0, 19, 1),
+};
+
+static struct rt2880_pmx_func pwm0_grp_mt7628[] = {
+	FUNC("sdcx", 3, 18, 1),
+	FUNC("utif", 2, 18, 1),
+	FUNC("gpio", 1, 18, 1),
+	FUNC("pwm", 0, 18, 1),
+};
+
+static struct rt2880_pmx_func uart2_grp_mt7628[] = {
+	FUNC("sdcx", 3, 20, 2),
+	FUNC("pwm", 2, 20, 2),
+	FUNC("gpio", 1, 20, 2),
+	FUNC("uart", 0, 20, 2),
+};
+
+static struct rt2880_pmx_func uart1_grp_mt7628[] = {
+	FUNC("sdcx", 3, 45, 2),
+	FUNC("pwm", 2, 45, 2),
+	FUNC("gpio", 1, 45, 2),
+	FUNC("uart", 0, 45, 2),
+};
+
+static struct rt2880_pmx_func i2c_grp_mt7628[] = {
+	FUNC("-", 3, 4, 2),
+	FUNC("debug", 2, 4, 2),
+	FUNC("gpio", 1, 4, 2),
+	FUNC("i2c", 0, 4, 2),
+};
+
+static struct rt2880_pmx_func refclk_grp_mt7628[] = { FUNC("reclk", 0, 36, 1) };
+static struct rt2880_pmx_func perst_grp_mt7628[] = { FUNC("perst", 0, 37, 1) };
+static struct rt2880_pmx_func wdt_grp_mt7628[] = { FUNC("wdt", 0, 15, 38) };
+static struct rt2880_pmx_func spi_grp_mt7628[] = { FUNC("spi", 0, 7, 4) };
+
+static struct rt2880_pmx_func sd_mode_grp_mt7628[] = {
+	FUNC("jtag", 3, 22, 8),
+	FUNC("utif", 2, 22, 8),
+	FUNC("gpio", 1, 22, 8),
+	FUNC("sdcx", 0, 22, 8),
+};
+
+static struct rt2880_pmx_func uart0_grp_mt7628[] = {
+	FUNC("-", 3, 12, 2),
+	FUNC("-", 2, 12, 2),
+	FUNC("gpio", 1, 12, 2),
+	FUNC("uart", 0, 12, 2),
+};
+
+static struct rt2880_pmx_func i2s_grp_mt7628[] = {
+	FUNC("antenna", 3, 0, 4),
+	FUNC("pcm", 2, 0, 4),
+	FUNC("gpio", 1, 0, 4),
+	FUNC("i2s", 0, 0, 4),
+};
+
+static struct rt2880_pmx_func spi_cs1_grp_mt7628[] = {
+	FUNC("-", 3, 6, 1),
+	FUNC("refclk", 2, 6, 1),
+	FUNC("gpio", 1, 6, 1),
+	FUNC("spi", 0, 6, 1),
+};
+
+static struct rt2880_pmx_func spis_grp_mt7628[] = {
+	FUNC("pwm", 3, 14, 4),
+	FUNC("util", 2, 14, 4),
+	FUNC("gpio", 1, 14, 4),
+	FUNC("spis", 0, 14, 4),
+};
+
+static struct rt2880_pmx_func gpio_grp_mt7628[] = {
+	FUNC("pcie", 3, 11, 1),
+	FUNC("refclk", 2, 11, 1),
+	FUNC("gpio", 1, 11, 1),
+	FUNC("gpio", 0, 11, 1),
+};
+
+#define MT7628_GPIO_MODE_MASK	0x3
+
+#define MT7628_GPIO_MODE_PWM1	30
+#define MT7628_GPIO_MODE_PWM0	28
+#define MT7628_GPIO_MODE_UART2	26
+#define MT7628_GPIO_MODE_UART1	24
+#define MT7628_GPIO_MODE_I2C	20
+#define MT7628_GPIO_MODE_REFCLK	18
+#define MT7628_GPIO_MODE_PERST	16
+#define MT7628_GPIO_MODE_WDT	14
+#define MT7628_GPIO_MODE_SPI	12
+#define MT7628_GPIO_MODE_SDMODE	10
+#define MT7628_GPIO_MODE_UART0	8
+#define MT7628_GPIO_MODE_I2S	6
+#define MT7628_GPIO_MODE_CS1	4
+#define MT7628_GPIO_MODE_SPIS	2
+#define MT7628_GPIO_MODE_GPIO	0
+
+static struct rt2880_pmx_group mt7628an_pinmux_data[] = {
+	GRP_G("pmw1", pwm1_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_PWM1),
+	GRP_G("pmw1", pwm0_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_PWM0),
+	GRP_G("uart2", uart2_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_UART2),
+	GRP_G("uart1", uart1_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_UART1),
+	GRP_G("i2c", i2c_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_I2C),
+	GRP("refclk", refclk_grp_mt7628, 1, MT7628_GPIO_MODE_REFCLK),
+	GRP("perst", perst_grp_mt7628, 1, MT7628_GPIO_MODE_PERST),
+	GRP("wdt", wdt_grp_mt7628, 1, MT7628_GPIO_MODE_WDT),
+	GRP("spi", spi_grp_mt7628, 1, MT7628_GPIO_MODE_SPI),
+	GRP_G("sdmode", sd_mode_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_SDMODE),
+	GRP_G("uart0", uart0_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_UART0),
+	GRP_G("i2s", i2s_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_I2S),
+	GRP_G("spi cs1", spi_cs1_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_CS1),
+	GRP_G("spis", spis_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_SPIS),
+	GRP_G("gpio", gpio_grp_mt7628, MT7628_GPIO_MODE_MASK,
+				1, MT7628_GPIO_MODE_GPIO),
+	{ 0 }
+};
+
+static __init u32
+mt7620_calc_rate(u32 ref_rate, u32 mul, u32 div)
+{
+	u64 t;
+
+	t = ref_rate;
+	t *= mul;
+	do_div(t, div);
+
+	return t;
+}
+
+#define MHZ(x)		((x) * 1000 * 1000)
+
+static __init unsigned long
+mt7620_get_xtal_rate(void)
+{
+	u32 reg;
+
+	reg = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG0);
+	if (reg & SYSCFG0_XTAL_FREQ_SEL)
+		return MHZ(40);
+
+	return MHZ(20);
+}
+
+static __init unsigned long
+mt7620_get_periph_rate(unsigned long xtal_rate)
+{
+	u32 reg;
+
+	reg = rt_sysc_r32(SYSC_REG_CLKCFG0);
+	if (reg & CLKCFG0_PERI_CLK_SEL)
+		return xtal_rate;
+
+	return MHZ(40);
+}
+
+static const u32 mt7620_clk_divider[] __initconst = { 2, 3, 4, 8 };
+
+static __init unsigned long
+mt7620_get_cpu_pll_rate(unsigned long xtal_rate)
+{
+	u32 reg;
+	u32 mul;
+	u32 div;
+
+	reg = rt_sysc_r32(SYSC_REG_CPLL_CONFIG0);
+	if (reg & CPLL_CFG0_BYPASS_REF_CLK)
+		return xtal_rate;
+
+	if ((reg & CPLL_CFG0_SW_CFG) == 0)
+		return MHZ(600);
+
+	mul = (reg >> CPLL_CFG0_PLL_MULT_RATIO_SHIFT) &
+	      CPLL_CFG0_PLL_MULT_RATIO_MASK;
+	mul += 24;
+	if (reg & CPLL_CFG0_LC_CURFCK)
+		mul *= 2;
+
+	div = (reg >> CPLL_CFG0_PLL_DIV_RATIO_SHIFT) &
+	      CPLL_CFG0_PLL_DIV_RATIO_MASK;
+
+	WARN_ON(div >= ARRAY_SIZE(mt7620_clk_divider));
+
+	return mt7620_calc_rate(xtal_rate, mul, mt7620_clk_divider[div]);
+}
+
+static __init unsigned long
+mt7620_get_pll_rate(unsigned long xtal_rate, unsigned long cpu_pll_rate)
+{
+	u32 reg;
+
+	reg = rt_sysc_r32(SYSC_REG_CPLL_CONFIG1);
+	if (reg & CPLL_CFG1_CPU_AUX1)
+		return xtal_rate;
+
+	if (reg & CPLL_CFG1_CPU_AUX0)
+		return MHZ(480);
+
+	return cpu_pll_rate;
+}
+
+static __init unsigned long
+mt7620_get_cpu_rate(unsigned long pll_rate)
+{
+	u32 reg;
+	u32 mul;
+	u32 div;
+
+	reg = rt_sysc_r32(SYSC_REG_CPU_SYS_CLKCFG);
+
+	mul = reg & CPU_SYS_CLKCFG_CPU_FFRAC_MASK;
+	div = (reg >> CPU_SYS_CLKCFG_CPU_FDIV_SHIFT) &
+	      CPU_SYS_CLKCFG_CPU_FDIV_MASK;
+
+	return mt7620_calc_rate(pll_rate, mul, div);
+}
+
+static const u32 mt7620_ocp_dividers[16] __initconst = {
+	[CPU_SYS_CLKCFG_OCP_RATIO_2] = 2,
+	[CPU_SYS_CLKCFG_OCP_RATIO_3] = 3,
+	[CPU_SYS_CLKCFG_OCP_RATIO_4] = 4,
+	[CPU_SYS_CLKCFG_OCP_RATIO_5] = 5,
+	[CPU_SYS_CLKCFG_OCP_RATIO_10] = 10,
+};
+
+static __init unsigned long
+mt7620_get_dram_rate(unsigned long pll_rate)
+{
+	if (dram_type == SYSCFG0_DRAM_TYPE_SDRAM)
+		return pll_rate / 4;
+
+	return pll_rate / 3;
+}
+
+static __init unsigned long
+mt7620_get_sys_rate(unsigned long cpu_rate)
+{
+	u32 reg;
+	u32 ocp_ratio;
+	u32 div;
+
+	reg = rt_sysc_r32(SYSC_REG_CPU_SYS_CLKCFG);
+
+	ocp_ratio = (reg >> CPU_SYS_CLKCFG_OCP_RATIO_SHIFT) &
+		    CPU_SYS_CLKCFG_OCP_RATIO_MASK;
+
+	if (WARN_ON(ocp_ratio >= ARRAY_SIZE(mt7620_ocp_dividers)))
+		return cpu_rate;
+
+	div = mt7620_ocp_dividers[ocp_ratio];
+	if (WARN(!div, "invalid divider for OCP ratio %u", ocp_ratio))
+		return cpu_rate;
+
+	return cpu_rate / div;
+}
+
+void __init ralink_clk_init(void)
+{
+	unsigned long xtal_rate;
+	unsigned long cpu_pll_rate;
+	unsigned long pll_rate;
+	unsigned long cpu_rate;
+	unsigned long sys_rate;
+	unsigned long dram_rate;
+	unsigned long periph_rate;
+
+	xtal_rate = mt7620_get_xtal_rate();
+
+#define RFMT(label)	label ":%lu.%03luMHz "
+#define RINT(x)		((x) / 1000000)
+#define RFRAC(x)	(((x) / 1000) % 1000)
+
+	if (mt762x_soc == MT762X_SOC_MT7628AN) {
+		if (xtal_rate == MHZ(40))
+			cpu_rate = MHZ(580);
+		else
+			cpu_rate = MHZ(575);
+		dram_rate = sys_rate = cpu_rate / 3;
+		periph_rate = MHZ(40);
+
+		ralink_clk_add("10000d00.uartlite", periph_rate);
+		ralink_clk_add("10000e00.uartlite", periph_rate);
+	} else {
+		cpu_pll_rate = mt7620_get_cpu_pll_rate(xtal_rate);
+		pll_rate = mt7620_get_pll_rate(xtal_rate, cpu_pll_rate);
+
+		cpu_rate = mt7620_get_cpu_rate(pll_rate);
+		dram_rate = mt7620_get_dram_rate(pll_rate);
+		sys_rate = mt7620_get_sys_rate(cpu_rate);
+		periph_rate = mt7620_get_periph_rate(xtal_rate);
+
+		pr_debug(RFMT("XTAL") RFMT("CPU_PLL") RFMT("PLL"),
+			 RINT(xtal_rate), RFRAC(xtal_rate),
+			 RINT(cpu_pll_rate), RFRAC(cpu_pll_rate),
+			 RINT(pll_rate), RFRAC(pll_rate));
+
+		ralink_clk_add("10000500.uart", periph_rate);
+	}
+
+	pr_debug(RFMT("CPU") RFMT("DRAM") RFMT("SYS") RFMT("PERIPH"),
+		 RINT(cpu_rate), RFRAC(cpu_rate),
+		 RINT(dram_rate), RFRAC(dram_rate),
+		 RINT(sys_rate), RFRAC(sys_rate),
+		 RINT(periph_rate), RFRAC(periph_rate));
+#undef RFRAC
+#undef RINT
+#undef RFMT
+
+	ralink_clk_add("cpu", cpu_rate);
+	ralink_clk_add("10000100.timer", periph_rate);
+	ralink_clk_add("10000120.watchdog", periph_rate);
+	ralink_clk_add("10000b00.spi", sys_rate);
+	ralink_clk_add("10000c00.uartlite", periph_rate);
+	ralink_clk_add("10180000.wmac", xtal_rate);
+}
+
+void __init ralink_of_remap(void)
+{
+	rt_sysc_membase = plat_of_remap_node("ralink,mt7620a-sysc");
+	rt_memc_membase = plat_of_remap_node("ralink,mt7620a-memc");
+
+	if (!rt_sysc_membase || !rt_memc_membase)
+		panic("Failed to remap core resources");
+}
+
+static __init void
+mt7620_dram_init(struct ralink_soc_info *soc_info)
+{
+	switch (dram_type) {
+	case SYSCFG0_DRAM_TYPE_SDRAM:
+		pr_info("Board has SDRAM\n");
+		soc_info->mem_size_min = MT7620_SDRAM_SIZE_MIN;
+		soc_info->mem_size_max = MT7620_SDRAM_SIZE_MAX;
+		break;
+
+	case SYSCFG0_DRAM_TYPE_DDR1:
+		pr_info("Board has DDR1\n");
+		soc_info->mem_size_min = MT7620_DDR1_SIZE_MIN;
+		soc_info->mem_size_max = MT7620_DDR1_SIZE_MAX;
+		break;
+
+	case SYSCFG0_DRAM_TYPE_DDR2:
+		pr_info("Board has DDR2\n");
+		soc_info->mem_size_min = MT7620_DDR2_SIZE_MIN;
+		soc_info->mem_size_max = MT7620_DDR2_SIZE_MAX;
+		break;
+	default:
+		BUG();
+	}
+}
+
+static __init void
+mt7628_dram_init(struct ralink_soc_info *soc_info)
+{
+	switch (dram_type) {
+	case SYSCFG0_DRAM_TYPE_DDR1_MT7628:
+		pr_info("Board has DDR1\n");
+		soc_info->mem_size_min = MT7620_DDR1_SIZE_MIN;
+		soc_info->mem_size_max = MT7620_DDR1_SIZE_MAX;
+		break;
+
+	case SYSCFG0_DRAM_TYPE_DDR2_MT7628:
+		pr_info("Board has DDR2\n");
+		soc_info->mem_size_min = MT7620_DDR2_SIZE_MIN;
+		soc_info->mem_size_max = MT7620_DDR2_SIZE_MAX;
+		break;
+	default:
+		BUG();
+	}
+}
+
+void prom_soc_init(struct ralink_soc_info *soc_info)
+{
+	void __iomem *sysc = (void __iomem *) KSEG1ADDR(MT7620_SYSC_BASE);
+	unsigned char *name = NULL;
+	u32 n0;
+	u32 n1;
+	u32 rev;
+	u32 cfg0;
+	u32 pmu0;
+	u32 pmu1;
+	u32 bga;
+
+	n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
+	n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
+	rev = __raw_readl(sysc + SYSC_REG_CHIP_REV);
+	bga = (rev >> CHIP_REV_PKG_SHIFT) & CHIP_REV_PKG_MASK;
+
+	if (n0 == MT7620_CHIP_NAME0 && n1 == MT7620_CHIP_NAME1) {
+		if (bga) {
+			mt762x_soc = MT762X_SOC_MT7620A;
+			name = "MT7620A";
+			soc_info->compatible = "ralink,mt7620a-soc";
+		} else {
+			mt762x_soc = MT762X_SOC_MT7620N;
+			name = "MT7620N";
+			soc_info->compatible = "ralink,mt7620n-soc";
+#ifdef CONFIG_PCI
+			panic("mt7620n is only supported for non pci kernels");
+#endif
+		}
+	} else if (n0 == MT7620_CHIP_NAME0 && n1 == MT7628_CHIP_NAME1) {
+		mt762x_soc = MT762X_SOC_MT7628AN;
+		name = "MT7628AN";
+		soc_info->compatible = "ralink,mt7628an-soc";
+	} else {
+		panic("mt762x: unknown SoC, n0:%08x n1:%08x\n", n0, n1);
+	}
+
+	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
+		"Ralink %s ver:%u eco:%u",
+		name,
+		(rev >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK,
+		(rev & CHIP_REV_ECO_MASK));
+
+	cfg0 = __raw_readl(sysc + SYSC_REG_SYSTEM_CONFIG0);
+	dram_type = (cfg0 >> SYSCFG0_DRAM_TYPE_SHIFT) & SYSCFG0_DRAM_TYPE_MASK;
+
+	soc_info->mem_base = MT7620_DRAM_BASE;
+	if (mt762x_soc == MT762X_SOC_MT7628AN)
+		mt7628_dram_init(soc_info);
+	else
+		mt7620_dram_init(soc_info);
+
+	pmu0 = __raw_readl(sysc + PMU0_CFG);
+	pmu1 = __raw_readl(sysc + PMU1_CFG);
+
+	pr_info("Analog PMU set to %s control\n",
+		(pmu0 & PMU_SW_SET) ? ("sw") : ("hw"));
+	pr_info("Digital PMU set to %s control\n",
+		(pmu1 & DIG_SW_SEL) ? ("sw") : ("hw"));
+
+	if (mt762x_soc == MT762X_SOC_MT7628AN)
+		rt2880_pinmux_data = mt7628an_pinmux_data;
+	else
+		rt2880_pinmux_data = mt7620a_pinmux_data;
+}
diff --git a/kernel/arch/mips/ralink/of.c b/kernel/arch/mips/ralink/of.c
new file mode 100644
index 000000000..0d30dcd63
--- /dev/null
+++ b/kernel/arch/mips/ralink/of.c
@@ -0,0 +1,101 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/sizes.h>
+#include <linux/of_fdt.h>
+#include <linux/kernel.h>
+#include <linux/bootmem.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+
+#include <asm/reboot.h>
+#include <asm/bootinfo.h>
+#include <asm/addrspace.h>
+#include <asm/prom.h>
+
+#include "common.h"
+
+__iomem void *rt_sysc_membase;
+__iomem void *rt_memc_membase;
+
+__iomem void *plat_of_remap_node(const char *node)
+{
+	struct resource res;
+	struct device_node *np;
+
+	np = of_find_compatible_node(NULL, NULL, node);
+	if (!np)
+		panic("Failed to find %s node", node);
+
+	if (of_address_to_resource(np, 0, &res))
+		panic("Failed to get resource for %s", node);
+
+	if ((request_mem_region(res.start,
+				resource_size(&res),
+				res.name) < 0))
+		panic("Failed to request resources for %s", node);
+
+	return ioremap_nocache(res.start, resource_size(&res));
+}
+
+void __init device_tree_init(void)
+{
+	unflatten_and_copy_device_tree();
+}
+
+static int memory_dtb;
+
+static int __init early_init_dt_find_memory(unsigned long node,
+				const char *uname, int depth, void *data)
+{
+	if (depth == 1 && !strcmp(uname, "memory@0"))
+		memory_dtb = 1;
+
+	return 0;
+}
+
+void __init plat_mem_setup(void)
+{
+	set_io_port_base(KSEG1);
+
+	/*
+	 * Load the builtin devicetree. This causes the chosen node to be
+	 * parsed resulting in our memory appearing
+	 */
+	__dt_setup_arch(__dtb_start);
+
+	strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+
+	of_scan_flat_dt(early_init_dt_find_memory, NULL);
+	if (memory_dtb)
+		of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+	else if (soc_info.mem_size)
+		add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
+				  BOOT_MEM_RAM);
+	else
+		detect_memory_region(soc_info.mem_base,
+				     soc_info.mem_size_min * SZ_1M,
+				     soc_info.mem_size_max * SZ_1M);
+}
+
+static int __init plat_of_setup(void)
+{
+	__dt_register_buses(soc_info.compatible, "palmbus");
+
+	/* make sure that the reset controller is setup early */
+	ralink_rst_init();
+
+	return 0;
+}
+
+arch_initcall(plat_of_setup);
diff --git a/kernel/arch/mips/ralink/prom.c b/kernel/arch/mips/ralink/prom.c
new file mode 100644
index 000000000..09419f67d
--- /dev/null
+++ b/kernel/arch/mips/ralink/prom.c
@@ -0,0 +1,70 @@
+/*
+ *  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.
+ *
+ *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2010 Joonas Lahtinen <joonas.lahtinen@gmail.com>
+ *  Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/string.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+
+#include <asm/bootinfo.h>
+#include <asm/addrspace.h>
+
+#include "common.h"
+
+struct ralink_soc_info soc_info;
+struct rt2880_pmx_group *rt2880_pinmux_data = NULL;
+
+const char *get_system_type(void)
+{
+	return soc_info.sys_type;
+}
+
+static __init void prom_init_cmdline(int argc, char **argv)
+{
+	int i;
+
+	pr_debug("prom: fw_arg0=%08x fw_arg1=%08x fw_arg2=%08x fw_arg3=%08x\n",
+	       (unsigned int)fw_arg0, (unsigned int)fw_arg1,
+	       (unsigned int)fw_arg2, (unsigned int)fw_arg3);
+
+	argc = fw_arg0;
+	argv = (char **) KSEG1ADDR(fw_arg1);
+
+	if (!argv) {
+		pr_debug("argv=%p is invalid, skipping\n",
+		       argv);
+		return;
+	}
+
+	for (i = 0; i < argc; i++) {
+		char *p = (char *) KSEG1ADDR(argv[i]);
+
+		if (CPHYSADDR(p) && *p) {
+			pr_debug("argv[%d]: %s\n", i, p);
+			strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
+			strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
+		}
+	}
+}
+
+void __init prom_init(void)
+{
+	int argc;
+	char **argv;
+
+	prom_soc_init(&soc_info);
+
+	pr_info("SoC Type: %s\n", get_system_type());
+
+	prom_init_cmdline(argc, argv);
+}
+
+void __init prom_free_prom_memory(void)
+{
+}
diff --git a/kernel/arch/mips/ralink/reset.c b/kernel/arch/mips/ralink/reset.c
new file mode 100644
index 000000000..55c7ec59d
--- /dev/null
+++ b/kernel/arch/mips/ralink/reset.c
@@ -0,0 +1,106 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/pm.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/reset-controller.h>
+
+#include <asm/reboot.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+/* Reset Control */
+#define SYSC_REG_RESET_CTRL     0x034
+#define RSTCTL_RESET_SYSTEM     BIT(0)
+
+static int ralink_assert_device(struct reset_controller_dev *rcdev,
+				unsigned long id)
+{
+	u32 val;
+
+	if (id < 8)
+		return -1;
+
+	val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
+	val |= BIT(id);
+	rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
+
+	return 0;
+}
+
+static int ralink_deassert_device(struct reset_controller_dev *rcdev,
+				  unsigned long id)
+{
+	u32 val;
+
+	if (id < 8)
+		return -1;
+
+	val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
+	val &= ~BIT(id);
+	rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
+
+	return 0;
+}
+
+static int ralink_reset_device(struct reset_controller_dev *rcdev,
+			       unsigned long id)
+{
+	ralink_assert_device(rcdev, id);
+	return ralink_deassert_device(rcdev, id);
+}
+
+static struct reset_control_ops reset_ops = {
+	.reset = ralink_reset_device,
+	.assert = ralink_assert_device,
+	.deassert = ralink_deassert_device,
+};
+
+static struct reset_controller_dev reset_dev = {
+	.ops			= &reset_ops,
+	.owner			= THIS_MODULE,
+	.nr_resets		= 32,
+	.of_reset_n_cells	= 1,
+};
+
+void ralink_rst_init(void)
+{
+	reset_dev.of_node = of_find_compatible_node(NULL, NULL,
+						"ralink,rt2880-reset");
+	if (!reset_dev.of_node)
+		pr_err("Failed to find reset controller node");
+	else
+		reset_controller_register(&reset_dev);
+}
+
+static void ralink_restart(char *command)
+{
+	local_irq_disable();
+	rt_sysc_w32(RSTCTL_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
+	unreachable();
+}
+
+static void ralink_halt(void)
+{
+	local_irq_disable();
+	unreachable();
+}
+
+static int __init mips_reboot_setup(void)
+{
+	_machine_restart = ralink_restart;
+	_machine_halt = ralink_halt;
+	pm_power_off = ralink_halt;
+
+	return 0;
+}
+
+arch_initcall(mips_reboot_setup);
diff --git a/kernel/arch/mips/ralink/rt288x.c b/kernel/arch/mips/ralink/rt288x.c
new file mode 100644
index 000000000..738cec865
--- /dev/null
+++ b/kernel/arch/mips/ralink/rt288x.c
@@ -0,0 +1,122 @@
+/*
+ * 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.
+ *
+ * Parts of this file are based on Ralink's 2.6.21 BSP
+ *
+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/mipsregs.h>
+#include <asm/mach-ralink/ralink_regs.h>
+#include <asm/mach-ralink/rt288x.h>
+#include <asm/mach-ralink/pinmux.h>
+
+#include "common.h"
+
+static struct rt2880_pmx_func i2c_func[] = { FUNC("i2c", 0, 1, 2) };
+static struct rt2880_pmx_func spi_func[] = { FUNC("spi", 0, 3, 4) };
+static struct rt2880_pmx_func uartlite_func[] = { FUNC("uartlite", 0, 7, 8) };
+static struct rt2880_pmx_func jtag_func[] = { FUNC("jtag", 0, 17, 5) };
+static struct rt2880_pmx_func mdio_func[] = { FUNC("mdio", 0, 22, 2) };
+static struct rt2880_pmx_func sdram_func[] = { FUNC("sdram", 0, 24, 16) };
+static struct rt2880_pmx_func pci_func[] = { FUNC("pci", 0, 40, 32) };
+
+static struct rt2880_pmx_group rt2880_pinmux_data_act[] = {
+	GRP("i2c", i2c_func, 1, RT2880_GPIO_MODE_I2C),
+	GRP("spi", spi_func, 1, RT2880_GPIO_MODE_SPI),
+	GRP("uartlite", uartlite_func, 1, RT2880_GPIO_MODE_UART0),
+	GRP("jtag", jtag_func, 1, RT2880_GPIO_MODE_JTAG),
+	GRP("mdio", mdio_func, 1, RT2880_GPIO_MODE_MDIO),
+	GRP("sdram", sdram_func, 1, RT2880_GPIO_MODE_SDRAM),
+	GRP("pci", pci_func, 1, RT2880_GPIO_MODE_PCI),
+	{ 0 }
+};
+
+static void rt288x_wdt_reset(void)
+{
+	u32 t;
+
+	/* enable WDT reset output on pin SRAM_CS_N */
+	t = rt_sysc_r32(SYSC_REG_CLKCFG);
+	t |= CLKCFG_SRAM_CS_N_WDT;
+	rt_sysc_w32(t, SYSC_REG_CLKCFG);
+}
+
+void __init ralink_clk_init(void)
+{
+	unsigned long cpu_rate, wmac_rate = 40000000;
+	u32 t = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG);
+	t = ((t >> SYSTEM_CONFIG_CPUCLK_SHIFT) & SYSTEM_CONFIG_CPUCLK_MASK);
+
+	switch (t) {
+	case SYSTEM_CONFIG_CPUCLK_250:
+		cpu_rate = 250000000;
+		break;
+	case SYSTEM_CONFIG_CPUCLK_266:
+		cpu_rate = 266666667;
+		break;
+	case SYSTEM_CONFIG_CPUCLK_280:
+		cpu_rate = 280000000;
+		break;
+	case SYSTEM_CONFIG_CPUCLK_300:
+		cpu_rate = 300000000;
+		break;
+	}
+
+	ralink_clk_add("cpu", cpu_rate);
+	ralink_clk_add("300100.timer", cpu_rate / 2);
+	ralink_clk_add("300120.watchdog", cpu_rate / 2);
+	ralink_clk_add("300500.uart", cpu_rate / 2);
+	ralink_clk_add("300c00.uartlite", cpu_rate / 2);
+	ralink_clk_add("400000.ethernet", cpu_rate / 2);
+	ralink_clk_add("480000.wmac", wmac_rate);
+}
+
+void __init ralink_of_remap(void)
+{
+	rt_sysc_membase = plat_of_remap_node("ralink,rt2880-sysc");
+	rt_memc_membase = plat_of_remap_node("ralink,rt2880-memc");
+
+	if (!rt_sysc_membase || !rt_memc_membase)
+		panic("Failed to remap core resources");
+}
+
+void prom_soc_init(struct ralink_soc_info *soc_info)
+{
+	void __iomem *sysc = (void __iomem *) KSEG1ADDR(RT2880_SYSC_BASE);
+	const char *name;
+	u32 n0;
+	u32 n1;
+	u32 id;
+
+	n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
+	n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
+	id = __raw_readl(sysc + SYSC_REG_CHIP_ID);
+
+	if (n0 == RT2880_CHIP_NAME0 && n1 == RT2880_CHIP_NAME1) {
+		soc_info->compatible = "ralink,r2880-soc";
+		name = "RT2880";
+	} else {
+		panic("rt288x: unknown SoC, n0:%08x n1:%08x", n0, n1);
+	}
+
+	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
+		"Ralink %s id:%u rev:%u",
+		name,
+		(id >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK,
+		(id & CHIP_ID_REV_MASK));
+
+	soc_info->mem_base = RT2880_SDRAM_BASE;
+	soc_info->mem_size_min = RT2880_MEM_SIZE_MIN;
+	soc_info->mem_size_max = RT2880_MEM_SIZE_MAX;
+
+	rt2880_pinmux_data = rt2880_pinmux_data_act;
+}
diff --git a/kernel/arch/mips/ralink/rt305x.c b/kernel/arch/mips/ralink/rt305x.c
new file mode 100644
index 000000000..c40776ab6
--- /dev/null
+++ b/kernel/arch/mips/ralink/rt305x.c
@@ -0,0 +1,283 @@
+/*
+ * 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.
+ *
+ * Parts of this file are based on Ralink's 2.6.21 BSP
+ *
+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/mipsregs.h>
+#include <asm/mach-ralink/ralink_regs.h>
+#include <asm/mach-ralink/rt305x.h>
+#include <asm/mach-ralink/pinmux.h>
+
+#include "common.h"
+
+enum rt305x_soc_type rt305x_soc;
+
+static struct rt2880_pmx_func i2c_func[] =  { FUNC("i2c", 0, 1, 2) };
+static struct rt2880_pmx_func spi_func[] = { FUNC("spi", 0, 3, 4) };
+static struct rt2880_pmx_func uartf_func[] = {
+	FUNC("uartf", RT305X_GPIO_MODE_UARTF, 7, 8),
+	FUNC("pcm uartf", RT305X_GPIO_MODE_PCM_UARTF, 7, 8),
+	FUNC("pcm i2s", RT305X_GPIO_MODE_PCM_I2S, 7, 8),
+	FUNC("i2s uartf", RT305X_GPIO_MODE_I2S_UARTF, 7, 8),
+	FUNC("pcm gpio", RT305X_GPIO_MODE_PCM_GPIO, 11, 4),
+	FUNC("gpio uartf", RT305X_GPIO_MODE_GPIO_UARTF, 7, 4),
+	FUNC("gpio i2s", RT305X_GPIO_MODE_GPIO_I2S, 7, 4),
+};
+static struct rt2880_pmx_func uartlite_func[] = { FUNC("uartlite", 0, 15, 2) };
+static struct rt2880_pmx_func jtag_func[] = { FUNC("jtag", 0, 17, 5) };
+static struct rt2880_pmx_func mdio_func[] = { FUNC("mdio", 0, 22, 2) };
+static struct rt2880_pmx_func rt5350_led_func[] = { FUNC("led", 0, 22, 5) };
+static struct rt2880_pmx_func rt5350_cs1_func[] = {
+	FUNC("spi_cs1", 0, 27, 1),
+	FUNC("wdg_cs1", 1, 27, 1),
+};
+static struct rt2880_pmx_func sdram_func[] = { FUNC("sdram", 0, 24, 16) };
+static struct rt2880_pmx_func rt3352_rgmii_func[] = {
+	FUNC("rgmii", 0, 24, 12)
+};
+static struct rt2880_pmx_func rgmii_func[] = { FUNC("rgmii", 0, 40, 12) };
+static struct rt2880_pmx_func rt3352_lna_func[] = { FUNC("lna", 0, 36, 2) };
+static struct rt2880_pmx_func rt3352_pa_func[] = { FUNC("pa", 0, 38, 2) };
+static struct rt2880_pmx_func rt3352_led_func[] = { FUNC("led", 0, 40, 5) };
+
+static struct rt2880_pmx_group rt3050_pinmux_data[] = {
+	GRP("i2c", i2c_func, 1, RT305X_GPIO_MODE_I2C),
+	GRP("spi", spi_func, 1, RT305X_GPIO_MODE_SPI),
+	GRP("uartf", uartf_func, RT305X_GPIO_MODE_UART0_MASK,
+		RT305X_GPIO_MODE_UART0_SHIFT),
+	GRP("uartlite", uartlite_func, 1, RT305X_GPIO_MODE_UART1),
+	GRP("jtag", jtag_func, 1, RT305X_GPIO_MODE_JTAG),
+	GRP("mdio", mdio_func, 1, RT305X_GPIO_MODE_MDIO),
+	GRP("rgmii", rgmii_func, 1, RT305X_GPIO_MODE_RGMII),
+	GRP("sdram", sdram_func, 1, RT305X_GPIO_MODE_SDRAM),
+	{ 0 }
+};
+
+static struct rt2880_pmx_group rt3352_pinmux_data[] = {
+	GRP("i2c", i2c_func, 1, RT305X_GPIO_MODE_I2C),
+	GRP("spi", spi_func, 1, RT305X_GPIO_MODE_SPI),
+	GRP("uartf", uartf_func, RT305X_GPIO_MODE_UART0_MASK,
+		RT305X_GPIO_MODE_UART0_SHIFT),
+	GRP("uartlite", uartlite_func, 1, RT305X_GPIO_MODE_UART1),
+	GRP("jtag", jtag_func, 1, RT305X_GPIO_MODE_JTAG),
+	GRP("mdio", mdio_func, 1, RT305X_GPIO_MODE_MDIO),
+	GRP("rgmii", rt3352_rgmii_func, 1, RT305X_GPIO_MODE_RGMII),
+	GRP("lna", rt3352_lna_func, 1, RT3352_GPIO_MODE_LNA),
+	GRP("pa", rt3352_pa_func, 1, RT3352_GPIO_MODE_PA),
+	GRP("led", rt3352_led_func, 1, RT5350_GPIO_MODE_PHY_LED),
+	{ 0 }
+};
+
+static struct rt2880_pmx_group rt5350_pinmux_data[] = {
+	GRP("i2c", i2c_func, 1, RT305X_GPIO_MODE_I2C),
+	GRP("spi", spi_func, 1, RT305X_GPIO_MODE_SPI),
+	GRP("uartf", uartf_func, RT305X_GPIO_MODE_UART0_MASK,
+		RT305X_GPIO_MODE_UART0_SHIFT),
+	GRP("uartlite", uartlite_func, 1, RT305X_GPIO_MODE_UART1),
+	GRP("jtag", jtag_func, 1, RT305X_GPIO_MODE_JTAG),
+	GRP("led", rt5350_led_func, 1, RT5350_GPIO_MODE_PHY_LED),
+	GRP("spi_cs1", rt5350_cs1_func, 2, RT5350_GPIO_MODE_SPI_CS1),
+	{ 0 }
+};
+
+static void rt305x_wdt_reset(void)
+{
+	u32 t;
+
+	/* enable WDT reset output on pin SRAM_CS_N */
+	t = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG);
+	t |= RT305X_SYSCFG_SRAM_CS0_MODE_WDT <<
+		RT305X_SYSCFG_SRAM_CS0_MODE_SHIFT;
+	rt_sysc_w32(t, SYSC_REG_SYSTEM_CONFIG);
+}
+
+static unsigned long rt5350_get_mem_size(void)
+{
+	void __iomem *sysc = (void __iomem *) KSEG1ADDR(RT305X_SYSC_BASE);
+	unsigned long ret;
+	u32 t;
+
+	t = __raw_readl(sysc + SYSC_REG_SYSTEM_CONFIG);
+	t = (t >> RT5350_SYSCFG0_DRAM_SIZE_SHIFT) &
+		RT5350_SYSCFG0_DRAM_SIZE_MASK;
+
+	switch (t) {
+	case RT5350_SYSCFG0_DRAM_SIZE_2M:
+		ret = 2;
+		break;
+	case RT5350_SYSCFG0_DRAM_SIZE_8M:
+		ret = 8;
+		break;
+	case RT5350_SYSCFG0_DRAM_SIZE_16M:
+		ret = 16;
+		break;
+	case RT5350_SYSCFG0_DRAM_SIZE_32M:
+		ret = 32;
+		break;
+	case RT5350_SYSCFG0_DRAM_SIZE_64M:
+		ret = 64;
+		break;
+	default:
+		panic("rt5350: invalid DRAM size: %u", t);
+		break;
+	}
+
+	return ret;
+}
+
+void __init ralink_clk_init(void)
+{
+	unsigned long cpu_rate, sys_rate, wdt_rate, uart_rate;
+	unsigned long wmac_rate = 40000000;
+
+	u32 t = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG);
+
+	if (soc_is_rt305x() || soc_is_rt3350()) {
+		t = (t >> RT305X_SYSCFG_CPUCLK_SHIFT) &
+		     RT305X_SYSCFG_CPUCLK_MASK;
+		switch (t) {
+		case RT305X_SYSCFG_CPUCLK_LOW:
+			cpu_rate = 320000000;
+			break;
+		case RT305X_SYSCFG_CPUCLK_HIGH:
+			cpu_rate = 384000000;
+			break;
+		}
+		sys_rate = uart_rate = wdt_rate = cpu_rate / 3;
+	} else if (soc_is_rt3352()) {
+		t = (t >> RT3352_SYSCFG0_CPUCLK_SHIFT) &
+		     RT3352_SYSCFG0_CPUCLK_MASK;
+		switch (t) {
+		case RT3352_SYSCFG0_CPUCLK_LOW:
+			cpu_rate = 384000000;
+			break;
+		case RT3352_SYSCFG0_CPUCLK_HIGH:
+			cpu_rate = 400000000;
+			break;
+		}
+		sys_rate = wdt_rate = cpu_rate / 3;
+		uart_rate = 40000000;
+	} else if (soc_is_rt5350()) {
+		t = (t >> RT5350_SYSCFG0_CPUCLK_SHIFT) &
+		     RT5350_SYSCFG0_CPUCLK_MASK;
+		switch (t) {
+		case RT5350_SYSCFG0_CPUCLK_360:
+			cpu_rate = 360000000;
+			sys_rate = cpu_rate / 3;
+			break;
+		case RT5350_SYSCFG0_CPUCLK_320:
+			cpu_rate = 320000000;
+			sys_rate = cpu_rate / 4;
+			break;
+		case RT5350_SYSCFG0_CPUCLK_300:
+			cpu_rate = 300000000;
+			sys_rate = cpu_rate / 3;
+			break;
+		default:
+			BUG();
+		}
+		uart_rate = 40000000;
+		wdt_rate = sys_rate;
+	} else {
+		BUG();
+	}
+
+	if (soc_is_rt3352() || soc_is_rt5350()) {
+		u32 val = rt_sysc_r32(RT3352_SYSC_REG_SYSCFG0);
+
+		if (!(val & RT3352_CLKCFG0_XTAL_SEL))
+			wmac_rate = 20000000;
+	}
+
+	ralink_clk_add("cpu", cpu_rate);
+	ralink_clk_add("10000b00.spi", sys_rate);
+	ralink_clk_add("10000100.timer", wdt_rate);
+	ralink_clk_add("10000120.watchdog", wdt_rate);
+	ralink_clk_add("10000500.uart", uart_rate);
+	ralink_clk_add("10000c00.uartlite", uart_rate);
+	ralink_clk_add("10100000.ethernet", sys_rate);
+	ralink_clk_add("10180000.wmac", wmac_rate);
+}
+
+void __init ralink_of_remap(void)
+{
+	rt_sysc_membase = plat_of_remap_node("ralink,rt3050-sysc");
+	rt_memc_membase = plat_of_remap_node("ralink,rt3050-memc");
+
+	if (!rt_sysc_membase || !rt_memc_membase)
+		panic("Failed to remap core resources");
+}
+
+void prom_soc_init(struct ralink_soc_info *soc_info)
+{
+	void __iomem *sysc = (void __iomem *) KSEG1ADDR(RT305X_SYSC_BASE);
+	unsigned char *name;
+	u32 n0;
+	u32 n1;
+	u32 id;
+
+	n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
+	n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
+
+	if (n0 == RT3052_CHIP_NAME0 && n1 == RT3052_CHIP_NAME1) {
+		unsigned long icache_sets;
+
+		icache_sets = (read_c0_config1() >> 22) & 7;
+		if (icache_sets == 1) {
+			rt305x_soc = RT305X_SOC_RT3050;
+			name = "RT3050";
+			soc_info->compatible = "ralink,rt3050-soc";
+		} else {
+			rt305x_soc = RT305X_SOC_RT3052;
+			name = "RT3052";
+			soc_info->compatible = "ralink,rt3052-soc";
+		}
+	} else if (n0 == RT3350_CHIP_NAME0 && n1 == RT3350_CHIP_NAME1) {
+		rt305x_soc = RT305X_SOC_RT3350;
+		name = "RT3350";
+		soc_info->compatible = "ralink,rt3350-soc";
+	} else if (n0 == RT3352_CHIP_NAME0 && n1 == RT3352_CHIP_NAME1) {
+		rt305x_soc = RT305X_SOC_RT3352;
+		name = "RT3352";
+		soc_info->compatible = "ralink,rt3352-soc";
+	} else if (n0 == RT5350_CHIP_NAME0 && n1 == RT5350_CHIP_NAME1) {
+		rt305x_soc = RT305X_SOC_RT5350;
+		name = "RT5350";
+		soc_info->compatible = "ralink,rt5350-soc";
+	} else {
+		panic("rt305x: unknown SoC, n0:%08x n1:%08x", n0, n1);
+	}
+
+	id = __raw_readl(sysc + SYSC_REG_CHIP_ID);
+
+	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
+		"Ralink %s id:%u rev:%u",
+		name,
+		(id >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK,
+		(id & CHIP_ID_REV_MASK));
+
+	soc_info->mem_base = RT305X_SDRAM_BASE;
+	if (soc_is_rt5350()) {
+		soc_info->mem_size = rt5350_get_mem_size();
+		rt2880_pinmux_data = rt5350_pinmux_data;
+	} else if (soc_is_rt305x() || soc_is_rt3350()) {
+		soc_info->mem_size_min = RT305X_MEM_SIZE_MIN;
+		soc_info->mem_size_max = RT305X_MEM_SIZE_MAX;
+		rt2880_pinmux_data = rt3050_pinmux_data;
+	} else if (soc_is_rt3352()) {
+		soc_info->mem_size_min = RT3352_MEM_SIZE_MIN;
+		soc_info->mem_size_max = RT3352_MEM_SIZE_MAX;
+		rt2880_pinmux_data = rt3352_pinmux_data;
+	}
+}
diff --git a/kernel/arch/mips/ralink/rt3883.c b/kernel/arch/mips/ralink/rt3883.c
new file mode 100644
index 000000000..86a535c77
--- /dev/null
+++ b/kernel/arch/mips/ralink/rt3883.c
@@ -0,0 +1,156 @@
+/*
+ * 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.
+ *
+ * Parts of this file are based on Ralink's 2.6.21 BSP
+ *
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/mipsregs.h>
+#include <asm/mach-ralink/ralink_regs.h>
+#include <asm/mach-ralink/rt3883.h>
+#include <asm/mach-ralink/pinmux.h>
+
+#include "common.h"
+
+static struct rt2880_pmx_func i2c_func[] =  { FUNC("i2c", 0, 1, 2) };
+static struct rt2880_pmx_func spi_func[] = { FUNC("spi", 0, 3, 4) };
+static struct rt2880_pmx_func uartf_func[] = {
+	FUNC("uartf", RT3883_GPIO_MODE_UARTF, 7, 8),
+	FUNC("pcm uartf", RT3883_GPIO_MODE_PCM_UARTF, 7, 8),
+	FUNC("pcm i2s", RT3883_GPIO_MODE_PCM_I2S, 7, 8),
+	FUNC("i2s uartf", RT3883_GPIO_MODE_I2S_UARTF, 7, 8),
+	FUNC("pcm gpio", RT3883_GPIO_MODE_PCM_GPIO, 11, 4),
+	FUNC("gpio uartf", RT3883_GPIO_MODE_GPIO_UARTF, 7, 4),
+	FUNC("gpio i2s", RT3883_GPIO_MODE_GPIO_I2S, 7, 4),
+};
+static struct rt2880_pmx_func uartlite_func[] = { FUNC("uartlite", 0, 15, 2) };
+static struct rt2880_pmx_func jtag_func[] = { FUNC("jtag", 0, 17, 5) };
+static struct rt2880_pmx_func mdio_func[] = { FUNC("mdio", 0, 22, 2) };
+static struct rt2880_pmx_func lna_a_func[] = { FUNC("lna a", 0, 32, 3) };
+static struct rt2880_pmx_func lna_g_func[] = { FUNC("lna a", 0, 35, 3) };
+static struct rt2880_pmx_func pci_func[] = {
+	FUNC("pci-dev", 0, 40, 32),
+	FUNC("pci-host2", 1, 40, 32),
+	FUNC("pci-host1", 2, 40, 32),
+	FUNC("pci-fnc", 3, 40, 32)
+};
+static struct rt2880_pmx_func ge1_func[] = { FUNC("ge1", 0, 72, 12) };
+static struct rt2880_pmx_func ge2_func[] = { FUNC("ge1", 0, 84, 12) };
+
+static struct rt2880_pmx_group rt3883_pinmux_data[] = {
+	GRP("i2c", i2c_func, 1, RT3883_GPIO_MODE_I2C),
+	GRP("spi", spi_func, 1, RT3883_GPIO_MODE_SPI),
+	GRP("uartf", uartf_func, RT3883_GPIO_MODE_UART0_MASK,
+		RT3883_GPIO_MODE_UART0_SHIFT),
+	GRP("uartlite", uartlite_func, 1, RT3883_GPIO_MODE_UART1),
+	GRP("jtag", jtag_func, 1, RT3883_GPIO_MODE_JTAG),
+	GRP("mdio", mdio_func, 1, RT3883_GPIO_MODE_MDIO),
+	GRP("lna a", lna_a_func, 1, RT3883_GPIO_MODE_LNA_A),
+	GRP("lna g", lna_g_func, 1, RT3883_GPIO_MODE_LNA_G),
+	GRP("pci", pci_func, RT3883_GPIO_MODE_PCI_MASK,
+		RT3883_GPIO_MODE_PCI_SHIFT),
+	GRP("ge1", ge1_func, 1, RT3883_GPIO_MODE_GE1),
+	GRP("ge2", ge2_func, 1, RT3883_GPIO_MODE_GE2),
+	{ 0 }
+};
+
+static void rt3883_wdt_reset(void)
+{
+	u32 t;
+
+	/* enable WDT reset output on GPIO 2 */
+	t = rt_sysc_r32(RT3883_SYSC_REG_SYSCFG1);
+	t |= RT3883_SYSCFG1_GPIO2_AS_WDT_OUT;
+	rt_sysc_w32(t, RT3883_SYSC_REG_SYSCFG1);
+}
+
+void __init ralink_clk_init(void)
+{
+	unsigned long cpu_rate, sys_rate;
+	u32 syscfg0;
+	u32 clksel;
+	u32 ddr2;
+
+	syscfg0 = rt_sysc_r32(RT3883_SYSC_REG_SYSCFG0);
+	clksel = ((syscfg0 >> RT3883_SYSCFG0_CPUCLK_SHIFT) &
+		RT3883_SYSCFG0_CPUCLK_MASK);
+	ddr2 = syscfg0 & RT3883_SYSCFG0_DRAM_TYPE_DDR2;
+
+	switch (clksel) {
+	case RT3883_SYSCFG0_CPUCLK_250:
+		cpu_rate = 250000000;
+		sys_rate = (ddr2) ? 125000000 : 83000000;
+		break;
+	case RT3883_SYSCFG0_CPUCLK_384:
+		cpu_rate = 384000000;
+		sys_rate = (ddr2) ? 128000000 : 96000000;
+		break;
+	case RT3883_SYSCFG0_CPUCLK_480:
+		cpu_rate = 480000000;
+		sys_rate = (ddr2) ? 160000000 : 120000000;
+		break;
+	case RT3883_SYSCFG0_CPUCLK_500:
+		cpu_rate = 500000000;
+		sys_rate = (ddr2) ? 166000000 : 125000000;
+		break;
+	}
+
+	ralink_clk_add("cpu", cpu_rate);
+	ralink_clk_add("10000100.timer", sys_rate);
+	ralink_clk_add("10000120.watchdog", sys_rate);
+	ralink_clk_add("10000500.uart", 40000000);
+	ralink_clk_add("10000b00.spi", sys_rate);
+	ralink_clk_add("10000c00.uartlite", 40000000);
+	ralink_clk_add("10100000.ethernet", sys_rate);
+	ralink_clk_add("10180000.wmac", 40000000);
+}
+
+void __init ralink_of_remap(void)
+{
+	rt_sysc_membase = plat_of_remap_node("ralink,rt3883-sysc");
+	rt_memc_membase = plat_of_remap_node("ralink,rt3883-memc");
+
+	if (!rt_sysc_membase || !rt_memc_membase)
+		panic("Failed to remap core resources");
+}
+
+void prom_soc_init(struct ralink_soc_info *soc_info)
+{
+	void __iomem *sysc = (void __iomem *) KSEG1ADDR(RT3883_SYSC_BASE);
+	const char *name;
+	u32 n0;
+	u32 n1;
+	u32 id;
+
+	n0 = __raw_readl(sysc + RT3883_SYSC_REG_CHIPID0_3);
+	n1 = __raw_readl(sysc + RT3883_SYSC_REG_CHIPID4_7);
+	id = __raw_readl(sysc + RT3883_SYSC_REG_REVID);
+
+	if (n0 == RT3883_CHIP_NAME0 && n1 == RT3883_CHIP_NAME1) {
+		soc_info->compatible = "ralink,rt3883-soc";
+		name = "RT3883";
+	} else {
+		panic("rt3883: unknown SoC, n0:%08x n1:%08x", n0, n1);
+	}
+
+	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
+		"Ralink %s ver:%u eco:%u",
+		name,
+		(id >> RT3883_REVID_VER_ID_SHIFT) & RT3883_REVID_VER_ID_MASK,
+		(id & RT3883_REVID_ECO_ID_MASK));
+
+	soc_info->mem_base = RT3883_SDRAM_BASE;
+	soc_info->mem_size_min = RT3883_MEM_SIZE_MIN;
+	soc_info->mem_size_max = RT3883_MEM_SIZE_MAX;
+
+	rt2880_pinmux_data = rt3883_pinmux_data;
+}
diff --git a/kernel/arch/mips/ralink/timer.c b/kernel/arch/mips/ralink/timer.c
new file mode 100644
index 000000000..82c72a15b
--- /dev/null
+++ b/kernel/arch/mips/ralink/timer.c
@@ -0,0 +1,184 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+*/
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/timer.h>
+#include <linux/of_gpio.h>
+#include <linux/clk.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+#define TIMER_REG_TMRSTAT		0x00
+#define TIMER_REG_TMR0LOAD		0x10
+#define TIMER_REG_TMR0CTL		0x18
+
+#define TMRSTAT_TMR0INT			BIT(0)
+
+#define TMR0CTL_ENABLE			BIT(7)
+#define TMR0CTL_MODE_PERIODIC		BIT(4)
+#define TMR0CTL_PRESCALER		1
+#define TMR0CTL_PRESCALE_VAL		(0xf - TMR0CTL_PRESCALER)
+#define TMR0CTL_PRESCALE_DIV		(65536 / BIT(TMR0CTL_PRESCALER))
+
+struct rt_timer {
+	struct device	*dev;
+	void __iomem	*membase;
+	int		irq;
+	unsigned long	timer_freq;
+	unsigned long	timer_div;
+};
+
+static inline void rt_timer_w32(struct rt_timer *rt, u8 reg, u32 val)
+{
+	__raw_writel(val, rt->membase + reg);
+}
+
+static inline u32 rt_timer_r32(struct rt_timer *rt, u8 reg)
+{
+	return __raw_readl(rt->membase + reg);
+}
+
+static irqreturn_t rt_timer_irq(int irq, void *_rt)
+{
+	struct rt_timer *rt =  (struct rt_timer *) _rt;
+
+	rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);
+	rt_timer_w32(rt, TIMER_REG_TMRSTAT, TMRSTAT_TMR0INT);
+
+	return IRQ_HANDLED;
+}
+
+
+static int rt_timer_request(struct rt_timer *rt)
+{
+	int err = request_irq(rt->irq, rt_timer_irq, 0,
+						dev_name(rt->dev), rt);
+	if (err) {
+		dev_err(rt->dev, "failed to request irq\n");
+	} else {
+		u32 t = TMR0CTL_MODE_PERIODIC | TMR0CTL_PRESCALE_VAL;
+		rt_timer_w32(rt, TIMER_REG_TMR0CTL, t);
+	}
+	return err;
+}
+
+static void rt_timer_free(struct rt_timer *rt)
+{
+	free_irq(rt->irq, rt);
+}
+
+static int rt_timer_config(struct rt_timer *rt, unsigned long divisor)
+{
+	if (rt->timer_freq < divisor)
+		rt->timer_div = rt->timer_freq;
+	else
+		rt->timer_div = divisor;
+
+	rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);
+
+	return 0;
+}
+
+static int rt_timer_enable(struct rt_timer *rt)
+{
+	u32 t;
+
+	rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);
+
+	t = rt_timer_r32(rt, TIMER_REG_TMR0CTL);
+	t |= TMR0CTL_ENABLE;
+	rt_timer_w32(rt, TIMER_REG_TMR0CTL, t);
+
+	return 0;
+}
+
+static void rt_timer_disable(struct rt_timer *rt)
+{
+	u32 t;
+
+	t = rt_timer_r32(rt, TIMER_REG_TMR0CTL);
+	t &= ~TMR0CTL_ENABLE;
+	rt_timer_w32(rt, TIMER_REG_TMR0CTL, t);
+}
+
+static int rt_timer_probe(struct platform_device *pdev)
+{
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct rt_timer *rt;
+	struct clk *clk;
+
+	rt = devm_kzalloc(&pdev->dev, sizeof(*rt), GFP_KERNEL);
+	if (!rt) {
+		dev_err(&pdev->dev, "failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	rt->irq = platform_get_irq(pdev, 0);
+	if (!rt->irq) {
+		dev_err(&pdev->dev, "failed to load irq\n");
+		return -ENOENT;
+	}
+
+	rt->membase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(rt->membase))
+		return PTR_ERR(rt->membase);
+
+	clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk)) {
+		dev_err(&pdev->dev, "failed get clock rate\n");
+		return PTR_ERR(clk);
+	}
+
+	rt->timer_freq = clk_get_rate(clk) / TMR0CTL_PRESCALE_DIV;
+	if (!rt->timer_freq)
+		return -EINVAL;
+
+	rt->dev = &pdev->dev;
+	platform_set_drvdata(pdev, rt);
+
+	rt_timer_request(rt);
+	rt_timer_config(rt, 2);
+	rt_timer_enable(rt);
+
+	dev_info(&pdev->dev, "maximum frequency is %luHz\n", rt->timer_freq);
+
+	return 0;
+}
+
+static int rt_timer_remove(struct platform_device *pdev)
+{
+	struct rt_timer *rt = platform_get_drvdata(pdev);
+
+	rt_timer_disable(rt);
+	rt_timer_free(rt);
+
+	return 0;
+}
+
+static const struct of_device_id rt_timer_match[] = {
+	{ .compatible = "ralink,rt2880-timer" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, rt_timer_match);
+
+static struct platform_driver rt_timer_driver = {
+	.probe = rt_timer_probe,
+	.remove = rt_timer_remove,
+	.driver = {
+		.name		= "rt-timer",
+		.of_match_table	= rt_timer_match
+	},
+};
+
+module_platform_driver(rt_timer_driver);
+
+MODULE_DESCRIPTION("Ralink RT2880 timer");
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org");
+MODULE_LICENSE("GPL");