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author | John Crispin <john@openwrt.org> | 2013-04-25 19:02:42 +0000 |
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committer | John Crispin <john@openwrt.org> | 2013-04-25 19:02:42 +0000 |
commit | deb36359236e3d815aac8c2d062eca87d9cbd639 (patch) | |
tree | ea16c522c6d68a46b73e859a6e7c0a71591fdc75 /target/linux/ramips/patches-3.8/0137-watchdog-adds-ralink-wdt.patch | |
parent | 831c7ea04faf74a1f30c3b03a11b3ac48bbfae48 (diff) | |
download | mtk-20170518-deb36359236e3d815aac8c2d062eca87d9cbd639.zip mtk-20170518-deb36359236e3d815aac8c2d062eca87d9cbd639.tar.gz mtk-20170518-deb36359236e3d815aac8c2d062eca87d9cbd639.tar.bz2 |
ramips: sync kernel patches with the mips-next tree
Signed-off-by: John Crispin <blogic@openwrt.org>
SVN-Revision: 36431
Diffstat (limited to 'target/linux/ramips/patches-3.8/0137-watchdog-adds-ralink-wdt.patch')
-rw-r--r-- | target/linux/ramips/patches-3.8/0137-watchdog-adds-ralink-wdt.patch | 395 |
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 0000000..3b7246f --- /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); |