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Release 4.10 drivers/watchdog/digicolor_wdt.c

Directory: drivers/watchdog
/*
 * Watchdog driver for Conexant Digicolor
 *
 * Copyright (C) 2015 Paradox Innovation Ltd.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>


#define TIMER_A_CONTROL		0

#define TIMER_A_COUNT		4


#define TIMER_A_ENABLE_COUNT	BIT(0)

#define TIMER_A_ENABLE_WATCHDOG	BIT(1)


struct dc_wdt {
	
void __iomem		*base;
	
struct clk		*clk;
	
spinlock_t		lock;
};


static unsigned timeout;
module_param(timeout, uint, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");


static void dc_wdt_set(struct dc_wdt *wdt, u32 ticks) { unsigned long flags; spin_lock_irqsave(&wdt->lock, flags); writel_relaxed(0, wdt->base + TIMER_A_CONTROL); writel_relaxed(ticks, wdt->base + TIMER_A_COUNT); writel_relaxed(TIMER_A_ENABLE_COUNT | TIMER_A_ENABLE_WATCHDOG, wdt->base + TIMER_A_CONTROL); spin_unlock_irqrestore(&wdt->lock, flags); }

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static int dc_wdt_restart(struct watchdog_device *wdog, unsigned long action, void *data) { struct dc_wdt *wdt = watchdog_get_drvdata(wdog); dc_wdt_set(wdt, 1); /* wait for reset to assert... */ mdelay(500); return 0; }

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static int dc_wdt_start(struct watchdog_device *wdog) { struct dc_wdt *wdt = watchdog_get_drvdata(wdog); dc_wdt_set(wdt, wdog->timeout * clk_get_rate(wdt->clk)); return 0; }

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static int dc_wdt_stop(struct watchdog_device *wdog) { struct dc_wdt *wdt = watchdog_get_drvdata(wdog); writel_relaxed(0, wdt->base + TIMER_A_CONTROL); return 0; }

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static int dc_wdt_set_timeout(struct watchdog_device *wdog, unsigned int t) { struct dc_wdt *wdt = watchdog_get_drvdata(wdog); dc_wdt_set(wdt, t * clk_get_rate(wdt->clk)); wdog->timeout = t; return 0; }

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static unsigned int dc_wdt_get_timeleft(struct watchdog_device *wdog) { struct dc_wdt *wdt = watchdog_get_drvdata(wdog); uint32_t count = readl_relaxed(wdt->base + TIMER_A_COUNT); return count / clk_get_rate(wdt->clk); }

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static struct watchdog_ops dc_wdt_ops = { .owner = THIS_MODULE, .start = dc_wdt_start, .stop = dc_wdt_stop, .set_timeout = dc_wdt_set_timeout, .get_timeleft = dc_wdt_get_timeleft, .restart = dc_wdt_restart, }; static struct watchdog_info dc_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .identity = "Conexant Digicolor Watchdog", }; static struct watchdog_device dc_wdt_wdd = { .info = &dc_wdt_info, .ops = &dc_wdt_ops, .min_timeout = 1, };
static int dc_wdt_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct dc_wdt *wdt; int ret; wdt = devm_kzalloc(dev, sizeof(struct dc_wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; platform_set_drvdata(pdev, wdt); wdt->base = of_iomap(np, 0); if (!wdt->base) { dev_err(dev, "Failed to remap watchdog regs"); return -ENODEV; } wdt->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(wdt->clk)) { ret = PTR_ERR(wdt->clk); goto err_iounmap; } dc_wdt_wdd.max_timeout = U32_MAX / clk_get_rate(wdt->clk); dc_wdt_wdd.timeout = dc_wdt_wdd.max_timeout; dc_wdt_wdd.parent = &pdev->dev; spin_lock_init(&wdt->lock); watchdog_set_drvdata(&dc_wdt_wdd, wdt); watchdog_set_restart_priority(&dc_wdt_wdd, 128); watchdog_init_timeout(&dc_wdt_wdd, timeout, dev); ret = watchdog_register_device(&dc_wdt_wdd); if (ret) { dev_err(dev, "Failed to register watchdog device"); goto err_iounmap; } return 0; err_iounmap: iounmap(wdt->base); return ret; }

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static int dc_wdt_remove(struct platform_device *pdev) { struct dc_wdt *wdt = platform_get_drvdata(pdev); watchdog_unregister_device(&dc_wdt_wdd); iounmap(wdt->base); return 0; }

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static void dc_wdt_shutdown(struct platform_device *pdev) { dc_wdt_stop(&dc_wdt_wdd); }

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static const struct of_device_id dc_wdt_of_match[] = { { .compatible = "cnxt,cx92755-wdt", }, {}, }; MODULE_DEVICE_TABLE(of, dc_wdt_of_match); static struct platform_driver dc_wdt_driver = { .probe = dc_wdt_probe, .remove = dc_wdt_remove, .shutdown = dc_wdt_shutdown, .driver = { .name = "digicolor-wdt", .of_match_table = dc_wdt_of_match, }, }; module_platform_driver(dc_wdt_driver); MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); MODULE_DESCRIPTION("Driver for Conexant Digicolor watchdog timer"); MODULE_LICENSE("GPL");

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Directory: drivers/watchdog
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