From 9ea6404691a520f734b819cbbd4757b0ea5f99c6 Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Thu, 10 May 2012 15:46:48 +0900 Subject: watchdog: shwdt: Basic clock framework support. This plugs in basic clock framework support for the watchdog. As it's an optional MSTP bit, we don't particularly care if a platform has provided it or not, though a valid clock will need to be available for the more complex overflow period calculations found on newer parts -- this will be addressed later. Signed-off-by: Paul Mundt --- drivers/watchdog/shwdt.c | 50 +++++++++++++++++++++++++----------------------- 1 file changed, 26 insertions(+), 24 deletions(-) (limited to 'drivers/watchdog/shwdt.c') diff --git a/drivers/watchdog/shwdt.c b/drivers/watchdog/shwdt.c index de3630d6bd4..380ada4e5d6 100644 --- a/drivers/watchdog/shwdt.c +++ b/drivers/watchdog/shwdt.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #define DRV_NAME "sh-wdt" @@ -74,6 +75,7 @@ static unsigned long next_heartbeat; struct sh_wdt { void __iomem *base; struct device *dev; + struct clk *clk; spinlock_t lock; struct timer_list timer; @@ -225,27 +227,32 @@ static int __devinit sh_wdt_probe(struct platform_device *pdev) if (unlikely(!res)) return -EINVAL; - if (!devm_request_mem_region(&pdev->dev, res->start, - resource_size(res), DRV_NAME)) - return -EBUSY; - wdt = devm_kzalloc(&pdev->dev, sizeof(struct sh_wdt), GFP_KERNEL); - if (unlikely(!wdt)) { - rc = -ENOMEM; - goto out_release; - } + if (unlikely(!wdt)) + return -ENOMEM; wdt->dev = &pdev->dev; - watchdog_set_nowayout(&sh_wdt_dev, nowayout); - watchdog_set_drvdata(&sh_wdt_dev, wdt); + wdt->clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(wdt->clk)) { + /* + * Clock framework support is optional, continue on + * anyways if we don't find a matching clock. + */ + wdt->clk = NULL; + } - wdt->base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + clk_enable(wdt->clk); + + wdt->base = devm_request_and_ioremap(wdt->dev, res); if (unlikely(!wdt->base)) { - rc = -ENXIO; - goto out_err; + rc = -EADDRNOTAVAIL; + goto out_disable; } + watchdog_set_nowayout(&sh_wdt_dev, nowayout); + watchdog_set_drvdata(&sh_wdt_dev, wdt); + spin_lock_init(&wdt->lock); rc = sh_wdt_set_heartbeat(&sh_wdt_dev, heartbeat); @@ -264,7 +271,7 @@ static int __devinit sh_wdt_probe(struct platform_device *pdev) rc = watchdog_register_device(&sh_wdt_dev); if (unlikely(rc)) { dev_err(&pdev->dev, "Can't register watchdog (err=%d)\n", rc); - goto out_unmap; + goto out_disable; } init_timer(&wdt->timer); @@ -278,12 +285,9 @@ static int __devinit sh_wdt_probe(struct platform_device *pdev) return 0; -out_unmap: - devm_iounmap(&pdev->dev, wdt->base); -out_err: - devm_kfree(&pdev->dev, wdt); -out_release: - devm_release_mem_region(&pdev->dev, res->start, resource_size(res)); +out_disable: + clk_disable(wdt->clk); + clk_put(wdt->clk); return rc; } @@ -291,15 +295,13 @@ out_release: static int __devexit sh_wdt_remove(struct platform_device *pdev) { struct sh_wdt *wdt = platform_get_drvdata(pdev); - struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); platform_set_drvdata(pdev, NULL); watchdog_unregister_device(&sh_wdt_dev); - devm_release_mem_region(&pdev->dev, res->start, resource_size(res)); - devm_iounmap(&pdev->dev, wdt->base); - devm_kfree(&pdev->dev, wdt); + clk_disable(wdt->clk); + clk_put(wdt->clk); return 0; } -- cgit v1.2.3-70-g09d2