From a7977003293ed0c13e62d95fc8cd1d20e22b7282 Mon Sep 17 00:00:00 2001 From: Xiubo Li Date: Fri, 4 Apr 2014 09:33:25 +0800 Subject: watchdog: imx2_wdt: convert to use regmap API. This watchdog driver will be working on IMX2+, Vybrid, LS1, LS2+ platforms, and will be in different endianness mode in those SoCs: SoCs CPU endian mode WDT endian mode ------------------------------------------------ IMX2+ LE LE Vybird LE LE LS1 LE BE LS2 LE LE Other possible SoCs: SoCs CPU endian mode WDT endian mode ------------------------------------------------ Soc1 BE BE Soc2 BE LE And also the watchdog's registers will be 32-bits for some versions, and though it is 16-bits in IMX2+, Vybird and LS+. Using the regmap APIs, could be more easy to support different endianness and also more easy to support 32-bits version... Signed-off-by: Xiubo Li Reviewed-by: Guenter Roeck Acked-by: Shawn Guo Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/Kconfig | 1 + drivers/watchdog/imx2_wdt.c | 50 +++++++++++++++++++++++++++++---------------- 2 files changed, 33 insertions(+), 18 deletions(-) diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 2b4c1fc87653..65ef91e3e497 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -378,6 +378,7 @@ config MAX63XX_WATCHDOG config IMX2_WDT tristate "IMX2+ Watchdog" depends on ARCH_MXC + select REGMAP_MMIO help This is the driver for the hardware watchdog on the Freescale IMX2 and later processors. diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c index 179592288c9b..76fa724930ca 100644 --- a/drivers/watchdog/imx2_wdt.c +++ b/drivers/watchdog/imx2_wdt.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include #include @@ -61,7 +62,7 @@ static struct { struct clk *clk; - void __iomem *base; + struct regmap *regmap; unsigned timeout; unsigned long status; struct timer_list timer; /* Pings the watchdog when closed */ @@ -87,7 +88,9 @@ static const struct watchdog_info imx2_wdt_info = { static inline void imx2_wdt_setup(void) { - u16 val = __raw_readw(imx2_wdt.base + IMX2_WDT_WCR); + u32 val; + + regmap_read(imx2_wdt.regmap, IMX2_WDT_WCR, &val); /* Suspend timer in low power mode, write once-only */ val |= IMX2_WDT_WCR_WDZST; @@ -100,17 +103,17 @@ static inline void imx2_wdt_setup(void) /* Set the watchdog's Time-Out value */ val |= WDOG_SEC_TO_COUNT(imx2_wdt.timeout); - __raw_writew(val, imx2_wdt.base + IMX2_WDT_WCR); + regmap_write(imx2_wdt.regmap, IMX2_WDT_WCR, val); /* enable the watchdog */ val |= IMX2_WDT_WCR_WDE; - __raw_writew(val, imx2_wdt.base + IMX2_WDT_WCR); + regmap_write(imx2_wdt.regmap, IMX2_WDT_WCR, val); } static inline void imx2_wdt_ping(void) { - __raw_writew(IMX2_WDT_SEQ1, imx2_wdt.base + IMX2_WDT_WSR); - __raw_writew(IMX2_WDT_SEQ2, imx2_wdt.base + IMX2_WDT_WSR); + regmap_write(imx2_wdt.regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ1); + regmap_write(imx2_wdt.regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ2); } static void imx2_wdt_timer_ping(unsigned long arg) @@ -143,12 +146,8 @@ static void imx2_wdt_stop(void) static void imx2_wdt_set_timeout(int new_timeout) { - u16 val = __raw_readw(imx2_wdt.base + IMX2_WDT_WCR); - - /* set the new timeout value in the WSR */ - val &= ~IMX2_WDT_WCR_WT; - val |= WDOG_SEC_TO_COUNT(new_timeout); - __raw_writew(val, imx2_wdt.base + IMX2_WDT_WCR); + regmap_update_bits(imx2_wdt.regmap, IMX2_WDT_WCR, IMX2_WDT_WCR_WT, + WDOG_SEC_TO_COUNT(new_timeout)); } static int imx2_wdt_open(struct inode *inode, struct file *file) @@ -181,7 +180,7 @@ static long imx2_wdt_ioctl(struct file *file, unsigned int cmd, void __user *argp = (void __user *)arg; int __user *p = argp; int new_value; - u16 val; + u32 val; switch (cmd) { case WDIOC_GETSUPPORT: @@ -192,7 +191,7 @@ static long imx2_wdt_ioctl(struct file *file, unsigned int cmd, return put_user(0, p); case WDIOC_GETBOOTSTATUS: - val = __raw_readw(imx2_wdt.base + IMX2_WDT_WRSR); + regmap_read(imx2_wdt.regmap, IMX2_WDT_WRSR, &val); new_value = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0; return put_user(new_value, p); @@ -255,15 +254,30 @@ static struct miscdevice imx2_wdt_miscdev = { .fops = &imx2_wdt_fops, }; +static struct regmap_config imx2_wdt_regmap_config = { + .reg_bits = 16, + .reg_stride = 2, + .val_bits = 16, + .max_register = 0x8, +}; + static int __init imx2_wdt_probe(struct platform_device *pdev) { - int ret; struct resource *res; + void __iomem *base; + int ret; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - imx2_wdt.base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(imx2_wdt.base)) - return PTR_ERR(imx2_wdt.base); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + imx2_wdt.regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base, + &imx2_wdt_regmap_config); + if (IS_ERR(imx2_wdt.regmap)) { + dev_err(&pdev->dev, "regmap init failed\n"); + return PTR_ERR(imx2_wdt.regmap); + } imx2_wdt.clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(imx2_wdt.clk)) { -- cgit v1.2.1