ralink: add mt7621 support

there are still various missing pieces for full support.

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 39040

1 files changed, 235 insertions, 0 deletions

diff --git a/target/linux/ramips/patches-3.10/0505-watchdog-add-MT7621-support.patch b/target/linux/ramips/patches-3.10/0505-watchdog-add-MT7621-support.patch
new file mode 100644
index 0000000..af02f92
--- /dev/null
+++ b/target/linux/ramips/patches-3.10/0505-watchdog-add-MT7621-support.patch
@@ -0,0 +1,235 @@
+From eb50d97682d78af68388d24956a74de4ab751cf7 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Mon, 2 Dec 2013 16:18:36 +0100
+Subject: [PATCH 505/507] watchdog: add MT7621 support
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ drivers/watchdog/Kconfig      |    7 ++
+ drivers/watchdog/Makefile     |    1 +
+ drivers/watchdog/mt7621_wdt.c |  185 +++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 193 insertions(+)
+ create mode 100644 drivers/watchdog/mt7621_wdt.c
+
+Index: linux-3.10.21/drivers/watchdog/Kconfig
+===================================================================
+--- linux-3.10.21.orig/drivers/watchdog/Kconfig	2013-12-09 19:56:09.360682007 +0100
++++ linux-3.10.21/drivers/watchdog/Kconfig	2013-12-09 19:59:20.636686594 +0100
+@@ -1116,7 +1116,14 @@
+ config RALINK_WDT
+ 	tristate "Ralink SoC watchdog"
+ 	select WATCHDOG_CORE
+-	depends on RALINK
++	depends on RALINK && !SOC_MT7621
++	help
++	  Hardware driver for the Ralink SoC Watchdog Timer.
++
++config MT7621_WDT
++	tristate "Mediatek SoC watchdog"
++	select WATCHDOG_CORE
++	depends on RALINK && SOC_MT7621
+ 	help
+ 	  Hardware driver for the Ralink SoC Watchdog Timer.
+ 
+Index: linux-3.10.21/drivers/watchdog/Makefile
+===================================================================
+--- linux-3.10.21.orig/drivers/watchdog/Makefile	2013-12-09 19:56:09.360682007 +0100
++++ linux-3.10.21/drivers/watchdog/Makefile	2013-12-09 19:56:09.752682016 +0100
+@@ -136,6 +136,7 @@
+ octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
+ obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
+ obj-$(CONFIG_RALINK_WDT) += rt2880_wdt.o
++obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
+ 
+ # PARISC Architecture
+ 
+Index: linux-3.10.21/drivers/watchdog/mt7621_wdt.c
+===================================================================
+--- /dev/null	1970-01-01 00:00:00.000000000 +0000
++++ linux-3.10.21/drivers/watchdog/mt7621_wdt.c	2013-12-09 19:56:09.752682016 +0100
+@@ -0,0 +1,185 @@
++/*
++ * Ralink RT288x/RT3xxx/MT76xx built-in hardware watchdog timer
++ *
++ * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
++ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
++ *
++ * This driver was based on: drivers/watchdog/softdog.c
++ *
++ * 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/clk.h>
++#include <linux/reset.h>
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/watchdog.h>
++#include <linux/miscdevice.h>
++#include <linux/moduleparam.h>
++#include <linux/platform_device.h>
++
++#include <asm/mach-ralink/ralink_regs.h>
++
++#define SYSC_RSTSTAT			0x38
++#define WDT_RST_CAUSE			BIT(1)
++
++#define RALINK_WDT_TIMEOUT		30
++
++#define TIMER_REG_TMRSTAT		0x00
++#define TIMER_REG_TMR1LOAD		0x24
++#define TIMER_REG_TMR1CTL		0x20
++
++#define TMR1CTL_ENABLE			BIT(7)
++#define TMR1CTL_RESTART			BIT(9)
++
++static void __iomem *mt762x_wdt_base;
++
++static bool nowayout = WATCHDOG_NOWAYOUT;
++module_param(nowayout, bool, 0);
++MODULE_PARM_DESC(nowayout,
++		"Watchdog cannot be stopped once started (default="
++		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
++
++static inline void rt_wdt_w32(unsigned reg, u32 val)
++{
++	iowrite32(val, mt762x_wdt_base + reg);
++}
++
++static inline u32 rt_wdt_r32(unsigned reg)
++{
++	return ioread32(mt762x_wdt_base + reg);
++}
++
++static int mt762x_wdt_ping(struct watchdog_device *w)
++{
++	rt_wdt_w32(TIMER_REG_TMRSTAT, TMR1CTL_RESTART);
++
++	return 0;
++}
++
++static int mt762x_wdt_set_timeout(struct watchdog_device *w, unsigned int t)
++{
++	w->timeout = t;
++	rt_wdt_w32(TIMER_REG_TMR1LOAD, t * 1000);
++	mt762x_wdt_ping(w);
++
++	return 0;
++}
++
++static int mt762x_wdt_start(struct watchdog_device *w)
++{
++	u32 t;
++
++	rt_wdt_w32(TIMER_REG_TMR1CTL, 1000 << 16);
++	mt762x_wdt_set_timeout(w, w->timeout);
++
++	t = rt_wdt_r32(TIMER_REG_TMR1CTL);
++	t |= TMR1CTL_ENABLE;
++	rt_wdt_w32(TIMER_REG_TMR1CTL, t);
++
++	return 0;
++}
++
++static int mt762x_wdt_stop(struct watchdog_device *w)
++{
++	u32 t;
++
++	mt762x_wdt_ping(w);
++
++	t = rt_wdt_r32(TIMER_REG_TMR1CTL);
++	t &= ~TMR1CTL_ENABLE;
++	rt_wdt_w32(TIMER_REG_TMR1CTL, t);
++
++	return 0;
++}
++
++static int mt762x_wdt_bootcause(void)
++{
++	if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
++		return WDIOF_CARDRESET;
++
++	return 0;
++}
++
++static struct watchdog_info mt762x_wdt_info = {
++	.identity = "Mediatek Watchdog",
++	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
++};
++
++static struct watchdog_ops mt762x_wdt_ops = {
++	.owner = THIS_MODULE,
++	.start = mt762x_wdt_start,
++	.stop = mt762x_wdt_stop,
++	.ping = mt762x_wdt_ping,
++	.set_timeout = mt762x_wdt_set_timeout,
++};
++
++static struct watchdog_device mt762x_wdt_dev = {
++	.info = &mt762x_wdt_info,
++	.ops = &mt762x_wdt_ops,
++	.min_timeout = 1,
++};
++
++static int mt762x_wdt_probe(struct platform_device *pdev)
++{
++	struct resource *res;
++	int ret;
++
++	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	mt762x_wdt_base = devm_request_and_ioremap(&pdev->dev, res);
++	if (IS_ERR(mt762x_wdt_base))
++		return PTR_ERR(mt762x_wdt_base);
++
++	device_reset(&pdev->dev);
++
++	mt762x_wdt_dev.dev = &pdev->dev;
++	mt762x_wdt_dev.bootstatus = mt762x_wdt_bootcause();
++	mt762x_wdt_dev.max_timeout = (0xfffful / 1000);
++	mt762x_wdt_dev.timeout = mt762x_wdt_dev.max_timeout;
++
++	watchdog_set_nowayout(&mt762x_wdt_dev, nowayout);
++
++	ret = watchdog_register_device(&mt762x_wdt_dev);
++	if (!ret)
++		dev_info(&pdev->dev, "Initialized\n");
++
++	return 0;
++}
++
++static int mt762x_wdt_remove(struct platform_device *pdev)
++{
++	watchdog_unregister_device(&mt762x_wdt_dev);
++
++	return 0;
++}
++
++static void mt762x_wdt_shutdown(struct platform_device *pdev)
++{
++	mt762x_wdt_stop(&mt762x_wdt_dev);
++}
++
++static const struct of_device_id mt762x_wdt_match[] = {
++	{ .compatible = "mtk,mt7621-wdt" },
++	{},
++};
++MODULE_DEVICE_TABLE(of, mt762x_wdt_match);
++
++static struct platform_driver mt762x_wdt_driver = {
++	.probe		= mt762x_wdt_probe,
++	.remove		= mt762x_wdt_remove,
++	.shutdown	= mt762x_wdt_shutdown,
++	.driver		= {
++		.name		= KBUILD_MODNAME,
++		.owner		= THIS_MODULE,
++		.of_match_table	= mt762x_wdt_match,
++	},
++};
++
++module_platform_driver(mt762x_wdt_driver);
++
++MODULE_DESCRIPTION("MediaTek MT762x hardware watchdog driver");
++MODULE_AUTHOR("John Crispin <blogic@openwrt.org");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);