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>
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Родитель
2accf32078
Коммит
39487f6688
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@ -24,6 +24,7 @@
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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@ -50,6 +51,11 @@
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#define IMX2_WDT_WRSR 0x04 /* Reset Status Register */
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#define IMX2_WDT_WRSR_TOUT BIT(1) /* -> Reset due to Timeout */
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#define IMX2_WDT_WICR 0x06 /* Interrupt Control Register */
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#define IMX2_WDT_WICR_WIE BIT(15) /* -> Interrupt Enable */
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#define IMX2_WDT_WICR_WTIS BIT(14) /* -> Interrupt Status */
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#define IMX2_WDT_WICR_WICT 0xFF /* -> Interrupt Count Timeout */
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#define IMX2_WDT_WMCR 0x08 /* Misc Register */
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#define IMX2_WDT_MAX_TIME 128
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@ -80,6 +86,12 @@ static const struct watchdog_info imx2_wdt_info = {
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
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};
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static const struct watchdog_info imx2_wdt_pretimeout_info = {
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.identity = "imx2+ watchdog",
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE |
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WDIOF_PRETIMEOUT,
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};
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static int imx2_wdt_restart(struct watchdog_device *wdog, unsigned long action,
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void *data)
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{
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@ -169,6 +181,35 @@ static int imx2_wdt_set_timeout(struct watchdog_device *wdog,
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return 0;
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}
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static int imx2_wdt_set_pretimeout(struct watchdog_device *wdog,
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unsigned int new_pretimeout)
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{
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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if (new_pretimeout >= IMX2_WDT_MAX_TIME)
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return -EINVAL;
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wdog->pretimeout = new_pretimeout;
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regmap_update_bits(wdev->regmap, IMX2_WDT_WICR,
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IMX2_WDT_WICR_WIE | IMX2_WDT_WICR_WICT,
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IMX2_WDT_WICR_WIE | (new_pretimeout << 1));
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return 0;
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}
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static irqreturn_t imx2_wdt_isr(int irq, void *wdog_arg)
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{
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struct watchdog_device *wdog = wdog_arg;
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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regmap_write_bits(wdev->regmap, IMX2_WDT_WICR,
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IMX2_WDT_WICR_WTIS, IMX2_WDT_WICR_WTIS);
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watchdog_notify_pretimeout(wdog);
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return IRQ_HANDLED;
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}
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static int imx2_wdt_start(struct watchdog_device *wdog)
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{
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struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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@ -188,6 +229,7 @@ static const struct watchdog_ops imx2_wdt_ops = {
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.start = imx2_wdt_start,
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.ping = imx2_wdt_ping,
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.set_timeout = imx2_wdt_set_timeout,
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.set_pretimeout = imx2_wdt_set_pretimeout,
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.restart = imx2_wdt_restart,
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};
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@ -236,6 +278,12 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
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wdog->max_hw_heartbeat_ms = IMX2_WDT_MAX_TIME * 1000;
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wdog->parent = &pdev->dev;
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ret = platform_get_irq(pdev, 0);
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if (ret > 0)
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if (!devm_request_irq(&pdev->dev, ret, imx2_wdt_isr, 0,
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dev_name(&pdev->dev), wdog))
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wdog->info = &imx2_wdt_pretimeout_info;
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ret = clk_prepare_enable(wdev->clk);
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if (ret)
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return ret;
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