diff options
Diffstat (limited to 'drivers/watchdog/moxart_wdt.c')
| -rw-r--r-- | drivers/watchdog/moxart_wdt.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/drivers/watchdog/moxart_wdt.c b/drivers/watchdog/moxart_wdt.c deleted file mode 100644 index 4166e4d..0000000 --- a/drivers/watchdog/moxart_wdt.c +++ /dev/null @@ -1,165 +0,0 @@ -/* - * MOXA ART SoCs watchdog driver. - * - * Copyright (C) 2013 Jonas Jensen - * - * Jonas Jensen <jonas.jensen@gmail.com> - * - * This file is licensed under the terms of the GNU General Public - * License version 2. This program is licensed "as is" without any - * warranty of any kind, whether express or implied. - */ - -#include <linux/clk.h> -#include <linux/io.h> -#include <linux/module.h> -#include <linux/err.h> -#include <linux/kernel.h> -#include <linux/platform_device.h> -#include <linux/watchdog.h> -#include <linux/moduleparam.h> - -#define REG_COUNT 0x4 -#define REG_MODE 0x8 -#define REG_ENABLE 0xC - -struct moxart_wdt_dev { - struct watchdog_device dev; - void __iomem *base; - unsigned int clock_frequency; -}; - -static int heartbeat; - -static int moxart_wdt_stop(struct watchdog_device *wdt_dev) -{ - struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(wdt_dev); - - writel(0, moxart_wdt->base + REG_ENABLE); - - return 0; -} - -static int moxart_wdt_start(struct watchdog_device *wdt_dev) -{ - struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(wdt_dev); - - writel(moxart_wdt->clock_frequency * wdt_dev->timeout, - moxart_wdt->base + REG_COUNT); - writel(0x5ab9, moxart_wdt->base + REG_MODE); - writel(0x03, moxart_wdt->base + REG_ENABLE); - - return 0; -} - -static int moxart_wdt_set_timeout(struct watchdog_device *wdt_dev, - unsigned int timeout) -{ - wdt_dev->timeout = timeout; - - return 0; -} - -static const struct watchdog_info moxart_wdt_info = { - .identity = "moxart-wdt", - .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | - WDIOF_MAGICCLOSE, -}; - -static const struct watchdog_ops moxart_wdt_ops = { - .owner = THIS_MODULE, - .start = moxart_wdt_start, - .stop = moxart_wdt_stop, - .set_timeout = moxart_wdt_set_timeout, -}; - -static int moxart_wdt_probe(struct platform_device *pdev) -{ - struct moxart_wdt_dev *moxart_wdt; - struct device *dev = &pdev->dev; - struct device_node *node = dev->of_node; - struct resource *res; - struct clk *clk; - int err; - unsigned int max_timeout; - bool nowayout = WATCHDOG_NOWAYOUT; - - moxart_wdt = devm_kzalloc(dev, sizeof(*moxart_wdt), GFP_KERNEL); - if (!moxart_wdt) - return -ENOMEM; - - platform_set_drvdata(pdev, moxart_wdt); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - moxart_wdt->base = devm_ioremap_resource(dev, res); - if (IS_ERR(moxart_wdt->base)) - return PTR_ERR(moxart_wdt->base); - - clk = of_clk_get(node, 0); - if (IS_ERR(clk)) { - pr_err("%s: of_clk_get failed\n", __func__); - return PTR_ERR(clk); - } - - moxart_wdt->clock_frequency = clk_get_rate(clk); - if (moxart_wdt->clock_frequency == 0) { - pr_err("%s: incorrect clock frequency\n", __func__); - return -EINVAL; - } - - max_timeout = UINT_MAX / moxart_wdt->clock_frequency; - - moxart_wdt->dev.info = &moxart_wdt_info; - moxart_wdt->dev.ops = &moxart_wdt_ops; - moxart_wdt->dev.timeout = max_timeout; - moxart_wdt->dev.min_timeout = 1; - moxart_wdt->dev.max_timeout = max_timeout; - moxart_wdt->dev.parent = dev; - - watchdog_init_timeout(&moxart_wdt->dev, heartbeat, dev); - watchdog_set_nowayout(&moxart_wdt->dev, nowayout); - - watchdog_set_drvdata(&moxart_wdt->dev, moxart_wdt); - - err = watchdog_register_device(&moxart_wdt->dev); - if (err) - return err; - - dev_dbg(dev, "Watchdog enabled (heartbeat=%d sec, nowayout=%d)\n", - moxart_wdt->dev.timeout, nowayout); - - return 0; -} - -static int moxart_wdt_remove(struct platform_device *pdev) -{ - struct moxart_wdt_dev *moxart_wdt = platform_get_drvdata(pdev); - - moxart_wdt_stop(&moxart_wdt->dev); - watchdog_unregister_device(&moxart_wdt->dev); - - return 0; -} - -static const struct of_device_id moxart_watchdog_match[] = { - { .compatible = "moxa,moxart-watchdog" }, - { }, -}; - -static struct platform_driver moxart_wdt_driver = { - .probe = moxart_wdt_probe, - .remove = moxart_wdt_remove, - .driver = { - .name = "moxart-watchdog", - .owner = THIS_MODULE, - .of_match_table = moxart_watchdog_match, - }, -}; -module_platform_driver(moxart_wdt_driver); - -module_param(heartbeat, int, 0); -MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds"); - -MODULE_DESCRIPTION("MOXART watchdog driver"); -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); |