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author | Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> | 2016-10-07 12:41:39 (GMT) |
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committer | Wim Van Sebroeck <wim@iguana.be> | 2016-10-08 08:27:30 (GMT) |
commit | 39487f6688a557ebfc69816d7e02f210bf8fb2a3 (patch) | |
tree | 225817aa47888bd3d16a2d54012eac326b1fb1ba | |
parent | 2accf320786210db92f36866cc71fa894f510a4a (diff) | |
download | linux-39487f6688a557ebfc69816d7e02f210bf8fb2a3.tar.xz |
watchdog: imx2_wdt: add pretimeout function support
The change adds watchdog pretimeout notification handling to imx2_wdt
driver, if device data contains information about a valid interrupt.
It is unlikely but still possible (e.g. through a software limitation)
that only a subset of watchdogs on SoC has interrupt lines, hence
functionally the devices from these two groups have different
capabilities, and this is reflected in different watchdog_info
structs assigned to the devices.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
-rw-r--r-- | drivers/watchdog/imx2_wdt.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c index d17643e..4874b0f 100644 --- a/drivers/watchdog/imx2_wdt.c +++ b/drivers/watchdog/imx2_wdt.c @@ -24,6 +24,7 @@ #include <linux/clk.h> #include <linux/delay.h> #include <linux/init.h> +#include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> @@ -50,6 +51,11 @@ #define IMX2_WDT_WRSR 0x04 /* Reset Status Register */ #define IMX2_WDT_WRSR_TOUT BIT(1) /* -> Reset due to Timeout */ +#define IMX2_WDT_WICR 0x06 /* Interrupt Control Register */ +#define IMX2_WDT_WICR_WIE BIT(15) /* -> Interrupt Enable */ +#define IMX2_WDT_WICR_WTIS BIT(14) /* -> Interrupt Status */ +#define IMX2_WDT_WICR_WICT 0xFF /* -> Interrupt Count Timeout */ + #define IMX2_WDT_WMCR 0x08 /* Misc Register */ #define IMX2_WDT_MAX_TIME 128 @@ -80,6 +86,12 @@ static const struct watchdog_info imx2_wdt_info = { .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, }; +static const struct watchdog_info imx2_wdt_pretimeout_info = { + .identity = "imx2+ watchdog", + .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | + WDIOF_PRETIMEOUT, +}; + static int imx2_wdt_restart(struct watchdog_device *wdog, unsigned long action, void *data) { @@ -169,6 +181,35 @@ static int imx2_wdt_set_timeout(struct watchdog_device *wdog, return 0; } +static int imx2_wdt_set_pretimeout(struct watchdog_device *wdog, + unsigned int new_pretimeout) +{ + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); + + if (new_pretimeout >= IMX2_WDT_MAX_TIME) + return -EINVAL; + + wdog->pretimeout = new_pretimeout; + + regmap_update_bits(wdev->regmap, IMX2_WDT_WICR, + IMX2_WDT_WICR_WIE | IMX2_WDT_WICR_WICT, + IMX2_WDT_WICR_WIE | (new_pretimeout << 1)); + return 0; +} + +static irqreturn_t imx2_wdt_isr(int irq, void *wdog_arg) +{ + struct watchdog_device *wdog = wdog_arg; + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); + + regmap_write_bits(wdev->regmap, IMX2_WDT_WICR, + IMX2_WDT_WICR_WTIS, IMX2_WDT_WICR_WTIS); + + watchdog_notify_pretimeout(wdog); + + return IRQ_HANDLED; +} + static int imx2_wdt_start(struct watchdog_device *wdog) { struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); @@ -188,6 +229,7 @@ static const struct watchdog_ops imx2_wdt_ops = { .start = imx2_wdt_start, .ping = imx2_wdt_ping, .set_timeout = imx2_wdt_set_timeout, + .set_pretimeout = imx2_wdt_set_pretimeout, .restart = imx2_wdt_restart, }; @@ -236,6 +278,12 @@ static int __init imx2_wdt_probe(struct platform_device *pdev) wdog->max_hw_heartbeat_ms = IMX2_WDT_MAX_TIME * 1000; wdog->parent = &pdev->dev; + ret = platform_get_irq(pdev, 0); + if (ret > 0) + if (!devm_request_irq(&pdev->dev, ret, imx2_wdt_isr, 0, + dev_name(&pdev->dev), wdog)) + wdog->info = &imx2_wdt_pretimeout_info; + ret = clk_prepare_enable(wdev->clk); if (ret) return ret; |