diff options
Diffstat (limited to 'drivers/watchdog/rt2880_wdt.c')
| -rw-r--r-- | drivers/watchdog/rt2880_wdt.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/drivers/watchdog/rt2880_wdt.c b/drivers/watchdog/rt2880_wdt.c deleted file mode 100644 index 53d37fe..0000000 --- a/drivers/watchdog/rt2880_wdt.c +++ /dev/null @@ -1,207 +0,0 @@ -/* - * 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 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 struct clk *rt288x_wdt_clk; -static unsigned long rt288x_wdt_freq; -static void __iomem *rt288x_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, rt288x_wdt_base + reg); -} - -static inline u32 rt_wdt_r32(unsigned reg) -{ - return ioread32(rt288x_wdt_base + reg); -} - -static int rt288x_wdt_ping(struct watchdog_device *w) -{ - rt_wdt_w32(TIMER_REG_TMR1LOAD, w->timeout * rt288x_wdt_freq); - - return 0; -} - -static int rt288x_wdt_start(struct watchdog_device *w) -{ - u32 t; - - 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); - - rt288x_wdt_ping(w); - - t = rt_wdt_r32(TIMER_REG_TMR1CTL); - t |= TMR1CTL_ENABLE; - rt_wdt_w32(TIMER_REG_TMR1CTL, t); - - return 0; -} - -static int rt288x_wdt_stop(struct watchdog_device *w) -{ - u32 t; - - rt288x_wdt_ping(w); - - t = rt_wdt_r32(TIMER_REG_TMR1CTL); - t &= ~TMR1CTL_ENABLE; - rt_wdt_w32(TIMER_REG_TMR1CTL, t); - - return 0; -} - -static int rt288x_wdt_set_timeout(struct watchdog_device *w, unsigned int t) -{ - w->timeout = t; - rt288x_wdt_ping(w); - - return 0; -} - -static int rt288x_wdt_bootcause(void) -{ - if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE) - return WDIOF_CARDRESET; - - return 0; -} - -static struct watchdog_info rt288x_wdt_info = { - .identity = "Ralink Watchdog", - .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, -}; - -static struct watchdog_ops rt288x_wdt_ops = { - .owner = THIS_MODULE, - .start = rt288x_wdt_start, - .stop = rt288x_wdt_stop, - .ping = rt288x_wdt_ping, - .set_timeout = rt288x_wdt_set_timeout, -}; - -static struct watchdog_device rt288x_wdt_dev = { - .info = &rt288x_wdt_info, - .ops = &rt288x_wdt_ops, - .min_timeout = 1, -}; - -static int rt288x_wdt_probe(struct platform_device *pdev) -{ - struct resource *res; - int ret; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - rt288x_wdt_base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(rt288x_wdt_base)) - return PTR_ERR(rt288x_wdt_base); - - rt288x_wdt_clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(rt288x_wdt_clk)) - return PTR_ERR(rt288x_wdt_clk); - - device_reset(&pdev->dev); - - rt288x_wdt_freq = clk_get_rate(rt288x_wdt_clk) / RALINK_WDT_PRESCALE; - - rt288x_wdt_dev.dev = &pdev->dev; - rt288x_wdt_dev.bootstatus = rt288x_wdt_bootcause(); - - rt288x_wdt_dev.max_timeout = (0xfffful / rt288x_wdt_freq); - rt288x_wdt_dev.timeout = rt288x_wdt_dev.max_timeout; - - watchdog_set_nowayout(&rt288x_wdt_dev, nowayout); - - ret = watchdog_register_device(&rt288x_wdt_dev); - if (!ret) - dev_info(&pdev->dev, "Initialized\n"); - - return 0; -} - -static int rt288x_wdt_remove(struct platform_device *pdev) -{ - watchdog_unregister_device(&rt288x_wdt_dev); - - return 0; -} - -static void rt288x_wdt_shutdown(struct platform_device *pdev) -{ - rt288x_wdt_stop(&rt288x_wdt_dev); -} - -static const struct of_device_id rt288x_wdt_match[] = { - { .compatible = "ralink,rt2880-wdt" }, - {}, -}; -MODULE_DEVICE_TABLE(of, rt288x_wdt_match); - -static struct platform_driver rt288x_wdt_driver = { - .probe = rt288x_wdt_probe, - .remove = rt288x_wdt_remove, - .shutdown = rt288x_wdt_shutdown, - .driver = { - .name = KBUILD_MODNAME, - .owner = THIS_MODULE, - .of_match_table = rt288x_wdt_match, - }, -}; - -module_platform_driver(rt288x_wdt_driver); - -MODULE_DESCRIPTION("MediaTek/Ralink RT288x/RT3xxx hardware watchdog driver"); -MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org"); -MODULE_LICENSE("GPL v2"); |