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-rw-r--r--target/linux/ramips/patches-3.8/0137-watchdog-adds-ralink-wdt.patch395
1 files changed, 395 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.8/0137-watchdog-adds-ralink-wdt.patch b/target/linux/ramips/patches-3.8/0137-watchdog-adds-ralink-wdt.patch
new file mode 100644
index 000000000..3b7246ffd
--- /dev/null
+++ b/target/linux/ramips/patches-3.8/0137-watchdog-adds-ralink-wdt.patch
@@ -0,0 +1,395 @@
+From 14c1b064274d28cf88113a685c58374a515f3018 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Mon, 22 Apr 2013 23:23:07 +0200
+Subject: [PATCH 137/137] watchdog: adds ralink wdt
+
+Adds the watchdog driver for ralink SoC.
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ drivers/watchdog/Kconfig | 6 +
+ drivers/watchdog/Makefile | 1 +
+ drivers/watchdog/ralink_wdt.c | 352 +++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 359 insertions(+)
+ create mode 100644 drivers/watchdog/ralink_wdt.c
+
+--- a/drivers/watchdog/Kconfig
++++ b/drivers/watchdog/Kconfig
+@@ -1077,6 +1077,12 @@ config LANTIQ_WDT
+ help
+ Hardware driver for the Lantiq SoC Watchdog Timer.
+
++config RALINK_WDT
++ tristate "Ralink SoC watchdog"
++ depends on RALINK
++ help
++ Hardware driver for the Ralink SoC Watchdog Timer.
++
+ # PARISC Architecture
+
+ # POWERPC Architecture
+--- a/drivers/watchdog/Makefile
++++ b/drivers/watchdog/Makefile
+@@ -132,6 +132,7 @@ obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
+ obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
+ octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
+ obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
++obj-$(CONFIG_RALINK_WDT) += ralink_wdt.o
+
+ # PARISC Architecture
+
+--- /dev/null
++++ b/drivers/watchdog/ralink_wdt.c
+@@ -0,0 +1,352 @@
++/*
++ * Ralink RT288X/RT305X built-in hardware watchdog timer
++ *
++ * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
++ *
++ * This driver was based on: drivers/watchdog/ixp4xx_wdt.c
++ * Author: Deepak Saxena <dsaxena@plexity.net>
++ * Copyright 2004 (c) MontaVista, Software, Inc.
++ *
++ * which again was based on sa1100 driver,
++ * Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
++ *
++ * parts of the driver are based on Ralink's 2.6.21 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/bitops.h>
++#include <linux/errno.h>
++#include <linux/fs.h>
++#include <linux/init.h>
++#include <linux/kernel.h>
++#include <linux/miscdevice.h>
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/platform_device.h>
++#include <linux/types.h>
++#include <linux/watchdog.h>
++#include <linux/clk.h>
++#include <linux/err.h>
++
++#define DRIVER_NAME "ralink-wdt"
++
++#define RALINK_WDT_TIMEOUT 30 /* seconds */
++#define RALINK_WDT_PRESCALE 65536
++
++#define TIMER_REG_TMR1LOAD 0x00
++#define TIMER_REG_TMR1CTL 0x08
++
++#define TMRSTAT_TMR1RST BIT(5)
++
++#define TMR1CTL_ENABLE BIT(7)
++#define TMR1CTL_MODE_SHIFT 4
++#define TMR1CTL_MODE_MASK 0x3
++#define TMR1CTL_MODE_FREE_RUNNING 0x0
++#define TMR1CTL_MODE_PERIODIC 0x1
++#define TMR1CTL_MODE_TIMEOUT 0x2
++#define TMR1CTL_MODE_WDT 0x3
++#define TMR1CTL_PRESCALE_MASK 0xf
++#define TMR1CTL_PRESCALE_65536 0xf
++
++static int nowayout = WATCHDOG_NOWAYOUT;
++module_param(nowayout, int, 0);
++MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
++ "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
++
++static int ralink_wdt_timeout = RALINK_WDT_TIMEOUT;
++module_param_named(timeout, ralink_wdt_timeout, int, 0);
++MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, 0 means use maximum "
++ "(default=" __MODULE_STRING(RALINK_WDT_TIMEOUT) "s)");
++
++static unsigned long ralink_wdt_flags;
++
++#define WDT_FLAGS_BUSY 0
++#define WDT_FLAGS_EXPECT_CLOSE 1
++
++static struct clk *ralink_wdt_clk;
++static unsigned long ralink_wdt_freq;
++static int ralink_wdt_max_timeout;
++static void __iomem *ralink_wdt_base;
++
++static inline void rt_wdt_w32(unsigned reg, u32 val)
++{
++ __raw_writel(val, ralink_wdt_base + reg);
++}
++
++static inline u32 rt_wdt_r32(unsigned reg)
++{
++ return __raw_readl(ralink_wdt_base + reg);
++}
++
++static inline void ralink_wdt_keepalive(void)
++{
++ rt_wdt_w32(TIMER_REG_TMR1LOAD, ralink_wdt_timeout * ralink_wdt_freq);
++}
++
++static inline void ralink_wdt_enable(void)
++{
++ u32 t;
++
++ ralink_wdt_keepalive();
++
++ t = rt_wdt_r32(TIMER_REG_TMR1CTL);
++ t |= TMR1CTL_ENABLE;
++ rt_wdt_w32(TIMER_REG_TMR1CTL, t);
++}
++
++static inline void ralink_wdt_disable(void)
++{
++ u32 t;
++
++ ralink_wdt_keepalive();
++
++ t = rt_wdt_r32(TIMER_REG_TMR1CTL);
++ t &= ~TMR1CTL_ENABLE;
++ rt_wdt_w32(TIMER_REG_TMR1CTL, t);
++}
++
++static int ralink_wdt_set_timeout(int val)
++{
++ if (val < 1 || val > ralink_wdt_max_timeout) {
++ pr_warn(DRIVER_NAME
++ ": timeout value %d must be 0 < timeout <= %d, using %d\n",
++ val, ralink_wdt_max_timeout, ralink_wdt_timeout);
++ return -EINVAL;
++ }
++
++ ralink_wdt_timeout = val;
++ ralink_wdt_keepalive();
++
++ return 0;
++}
++
++static int ralink_wdt_open(struct inode *inode, struct file *file)
++{
++ u32 t;
++
++ if (test_and_set_bit(WDT_FLAGS_BUSY, &ralink_wdt_flags))
++ return -EBUSY;
++
++ clear_bit(WDT_FLAGS_EXPECT_CLOSE, &ralink_wdt_flags);
++
++ t = rt_wdt_r32(TIMER_REG_TMR1CTL);
++ t &= ~(TMR1CTL_MODE_MASK << TMR1CTL_MODE_SHIFT |
++ TMR1CTL_PRESCALE_MASK);
++ t |= (TMR1CTL_MODE_WDT << TMR1CTL_MODE_SHIFT |
++ TMR1CTL_PRESCALE_65536);
++ rt_wdt_w32(TIMER_REG_TMR1CTL, t);
++
++ ralink_wdt_enable();
++
++ return nonseekable_open(inode, file);
++}
++
++static int ralink_wdt_release(struct inode *inode, struct file *file)
++{
++ if (test_bit(WDT_FLAGS_EXPECT_CLOSE, &ralink_wdt_flags))
++ ralink_wdt_disable();
++ else {
++ pr_crit(DRIVER_NAME ": device closed unexpectedly, "
++ "watchdog timer will not stop!\n");
++ ralink_wdt_keepalive();
++ }
++
++ clear_bit(WDT_FLAGS_BUSY, &ralink_wdt_flags);
++ clear_bit(WDT_FLAGS_EXPECT_CLOSE, &ralink_wdt_flags);
++
++ return 0;
++}
++
++static ssize_t rt_wdt_w32ite(struct file *file, const char *data,
++ size_t len, loff_t *ppos)
++{
++ if (len) {
++ if (!nowayout) {
++ size_t i;
++
++ clear_bit(WDT_FLAGS_EXPECT_CLOSE, &ralink_wdt_flags);
++
++ for (i = 0; i != len; i++) {
++ char c;
++
++ if (get_user(c, data + i))
++ return -EFAULT;
++
++ if (c == 'V')
++ set_bit(WDT_FLAGS_EXPECT_CLOSE,
++ &ralink_wdt_flags);
++ }
++ }
++
++ ralink_wdt_keepalive();
++ }
++
++ return len;
++}
++
++static const struct watchdog_info ralink_wdt_info = {
++ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
++ WDIOF_MAGICCLOSE,
++ .firmware_version = 0,
++ .identity = "RALINK watchdog",
++};
++
++static long ralink_wdt_ioctl(struct file *file, unsigned int cmd,
++ unsigned long arg)
++{
++ void __user *argp = (void __user *)arg;
++ int __user *p = argp;
++ int err;
++ int t;
++
++ switch (cmd) {
++ case WDIOC_GETSUPPORT:
++ err = copy_to_user(argp, &ralink_wdt_info,
++ sizeof(ralink_wdt_info)) ? -EFAULT : 0;
++ break;
++
++ case WDIOC_GETSTATUS:
++ err = put_user(0, p);
++ break;
++
++ case WDIOC_KEEPALIVE:
++ ralink_wdt_keepalive();
++ err = 0;
++ break;
++
++ case WDIOC_SETTIMEOUT:
++ err = get_user(t, p);
++ if (err)
++ break;
++
++ err = ralink_wdt_set_timeout(t);
++ if (err)
++ break;
++
++ /* fallthrough */
++ case WDIOC_GETTIMEOUT:
++ err = put_user(ralink_wdt_timeout, p);
++ break;
++
++ default:
++ err = -ENOTTY;
++ break;
++ }
++
++ return err;
++}
++
++static const struct file_operations ralink_wdt_fops = {
++ .owner = THIS_MODULE,
++ .llseek = no_llseek,
++ .write = rt_wdt_w32ite,
++ .unlocked_ioctl = ralink_wdt_ioctl,
++ .open = ralink_wdt_open,
++ .release = ralink_wdt_release,
++};
++
++static struct miscdevice ralink_wdt_miscdev = {
++ .minor = WATCHDOG_MINOR,
++ .name = "watchdog",
++ .fops = &ralink_wdt_fops,
++};
++
++static int ralink_wdt_probe(struct platform_device *pdev)
++{
++ struct resource *res;
++ int err;
++
++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (!res) {
++ dev_err(&pdev->dev, "no memory resource found\n");
++ return -EINVAL;
++ }
++
++ ralink_wdt_base = ioremap(res->start, resource_size(res));
++ if (!ralink_wdt_base)
++ return -ENOMEM;
++
++ ralink_wdt_clk = clk_get(&pdev->dev, NULL);
++ if (IS_ERR(ralink_wdt_clk)) {
++ err = PTR_ERR(ralink_wdt_clk);
++ goto err_unmap;
++ }
++
++ err = clk_enable(ralink_wdt_clk);
++ if (err)
++ goto err_clk_put;
++
++ ralink_wdt_freq = clk_get_rate(ralink_wdt_clk) / RALINK_WDT_PRESCALE;
++ if (!ralink_wdt_freq) {
++ err = -EINVAL;
++ goto err_clk_disable;
++ }
++
++ ralink_wdt_max_timeout = (0xfffful / ralink_wdt_freq);
++ if (ralink_wdt_timeout < 1 ||
++ ralink_wdt_timeout > ralink_wdt_max_timeout) {
++ ralink_wdt_timeout = ralink_wdt_max_timeout;
++ dev_info(&pdev->dev,
++ "timeout value must be 0 < timeout <= %d, using %d\n",
++ ralink_wdt_max_timeout, ralink_wdt_timeout);
++ }
++
++ err = misc_register(&ralink_wdt_miscdev);
++ if (err) {
++ dev_err(&pdev->dev,
++ "unable to register misc device, err=%d\n", err);
++ goto err_clk_disable;
++ }
++
++ return 0;
++
++err_clk_disable:
++ clk_disable(ralink_wdt_clk);
++err_clk_put:
++ clk_put(ralink_wdt_clk);
++err_unmap:
++ iounmap(ralink_wdt_base);
++ return err;
++}
++
++static int ralink_wdt_remove(struct platform_device *pdev)
++{
++ misc_deregister(&ralink_wdt_miscdev);
++ clk_disable(ralink_wdt_clk);
++ clk_put(ralink_wdt_clk);
++ iounmap(ralink_wdt_base);
++ return 0;
++}
++
++static void ralink_wdt_shutdown(struct platform_device *pdev)
++{
++ ralink_wdt_disable();
++}
++
++static const struct of_device_id ralink_wdt_match[] = {
++ { .compatible = "ralink,rt2880-wdt" },
++ {},
++};
++MODULE_DEVICE_TABLE(of, ralink_wdt_match);
++
++static struct platform_driver ralink_wdt_driver = {
++ .probe = ralink_wdt_probe,
++ .remove = ralink_wdt_remove,
++ .shutdown = ralink_wdt_shutdown,
++ .driver = {
++ .name = DRIVER_NAME,
++ .owner = THIS_MODULE,
++ .of_match_table = ralink_wdt_match,
++ },
++};
++
++module_platform_driver(ralink_wdt_driver);
++
++MODULE_DESCRIPTION("MediaTek/Ralink RT288X/RT305X hardware watchdog driver");
++MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS("platform:" DRIVER_NAME);
++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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