watchdog: Add pm8916 watchdog driver
The PM816 module is a versatile PMIC with many diverse functions integrated, including, a watchdog. This watchdog is subcomponent of the PON (Power On) peripheral, in the same way as pwrkey/resin buttons. It works with two timers (2-stages), the first one generates an IRQ to the main SoC (APQ8016/MSM8916), the second one performs the reset. This driver expects the following device hierarchy: [pm8916]->[pm8916-pon]->[pm8916-wdt] It uses the pm8916 regmap to access PM8916 registers. Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>hifive-unleashed-5.1
Loic Poulain
Wim Van Sebroeck
parent
4d9c6e9016
commit
969c0acc03
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@ -847,6 +847,14 @@ config SPRD_WATCHDOG
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Say Y here to include watchdog timer supported
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by Spreadtrum system.
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config PM8916_WATCHDOG
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tristate "QCOM PM8916 pmic watchdog"
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depends on OF && MFD_SPMI_PMIC
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select WATCHDOG_CORE
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help
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Say Y here to include support watchdog timer embedded into the
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pm8916 module.
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# X86 (i386 + ia64 + x86_64) Architecture
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config ACQUIRE_WDT
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@ -92,6 +92,7 @@ obj-$(CONFIG_STM32_WATCHDOG) += stm32_iwdg.o
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obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o
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obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o
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obj-$(CONFIG_SPRD_WATCHDOG) += sprd_wdt.o
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obj-$(CONFIG_PM8916_WATCHDOG) += pm8916_wdt.o
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# X86 (i386 + ia64 + x86_64) Architecture
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obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
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@ -0,0 +1,211 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/bitops.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/property.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/watchdog.h>
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#define PON_INT_RT_STS 0x10
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#define PMIC_WD_BARK_STS_BIT BIT(6)
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#define PON_PMIC_WD_RESET_S1_TIMER 0x54
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#define PON_PMIC_WD_RESET_S2_TIMER 0x55
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#define PON_PMIC_WD_RESET_S2_CTL 0x56
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#define RESET_TYPE_WARM 0x01
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#define RESET_TYPE_SHUTDOWN 0x04
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#define RESET_TYPE_HARD 0x07
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#define PON_PMIC_WD_RESET_S2_CTL2 0x57
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#define S2_RESET_EN_BIT BIT(7)
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#define PON_PMIC_WD_RESET_PET 0x58
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#define WATCHDOG_PET_BIT BIT(0)
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#define PM8916_WDT_DEFAULT_TIMEOUT 32
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#define PM8916_WDT_MIN_TIMEOUT 1
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#define PM8916_WDT_MAX_TIMEOUT 127
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struct pm8916_wdt {
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struct regmap *regmap;
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struct watchdog_device wdev;
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u32 baseaddr;
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};
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static int pm8916_wdt_start(struct watchdog_device *wdev)
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{
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struct pm8916_wdt *wdt = watchdog_get_drvdata(wdev);
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return regmap_update_bits(wdt->regmap,
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wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL2,
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S2_RESET_EN_BIT, S2_RESET_EN_BIT);
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}
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static int pm8916_wdt_stop(struct watchdog_device *wdev)
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{
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struct pm8916_wdt *wdt = watchdog_get_drvdata(wdev);
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return regmap_update_bits(wdt->regmap,
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wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL2,
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S2_RESET_EN_BIT, 0);
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}
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static int pm8916_wdt_ping(struct watchdog_device *wdev)
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{
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struct pm8916_wdt *wdt = watchdog_get_drvdata(wdev);
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return regmap_update_bits(wdt->regmap,
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wdt->baseaddr + PON_PMIC_WD_RESET_PET,
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WATCHDOG_PET_BIT, WATCHDOG_PET_BIT);
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}
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static int pm8916_wdt_configure_timers(struct watchdog_device *wdev)
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{
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struct pm8916_wdt *wdt = watchdog_get_drvdata(wdev);
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int err;
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err = regmap_write(wdt->regmap,
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wdt->baseaddr + PON_PMIC_WD_RESET_S1_TIMER,
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wdev->timeout - wdev->pretimeout);
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if (err)
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return err;
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return regmap_write(wdt->regmap,
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wdt->baseaddr + PON_PMIC_WD_RESET_S2_TIMER,
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wdev->pretimeout);
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}
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static int pm8916_wdt_set_timeout(struct watchdog_device *wdev,
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unsigned int timeout)
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{
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wdev->timeout = timeout;
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return pm8916_wdt_configure_timers(wdev);
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}
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static int pm8916_wdt_set_pretimeout(struct watchdog_device *wdev,
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unsigned int pretimeout)
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{
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wdev->pretimeout = pretimeout;
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return pm8916_wdt_configure_timers(wdev);
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}
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static irqreturn_t pm8916_wdt_isr(int irq, void *arg)
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{
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struct pm8916_wdt *wdt = arg;
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int err, sts;
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err = regmap_read(wdt->regmap, wdt->baseaddr + PON_INT_RT_STS, &sts);
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if (err)
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return IRQ_HANDLED;
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if (sts & PMIC_WD_BARK_STS_BIT)
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watchdog_notify_pretimeout(&wdt->wdev);
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return IRQ_HANDLED;
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}
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static const struct watchdog_info pm8916_wdt_ident = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "QCOM PM8916 PON WDT",
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};
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static const struct watchdog_info pm8916_wdt_pt_ident = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE |
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WDIOF_PRETIMEOUT,
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.identity = "QCOM PM8916 PON WDT",
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};
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static const struct watchdog_ops pm8916_wdt_ops = {
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.owner = THIS_MODULE,
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.start = pm8916_wdt_start,
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.stop = pm8916_wdt_stop,
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.ping = pm8916_wdt_ping,
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.set_timeout = pm8916_wdt_set_timeout,
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.set_pretimeout = pm8916_wdt_set_pretimeout,
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};
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static int pm8916_wdt_probe(struct platform_device *pdev)
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{
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struct pm8916_wdt *wdt;
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struct device *parent;
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int err, irq;
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wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
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if (!wdt)
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return -ENOMEM;
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parent = pdev->dev.parent;
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/*
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* The pm8916-pon-wdt is a child of the pon device, which is a child
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* of the pm8916 mfd device. We want access to the pm8916 registers.
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* Retrieve regmap from pm8916 (parent->parent) and base address
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* from pm8916-pon (pon).
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*/
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wdt->regmap = dev_get_regmap(parent->parent, NULL);
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if (!wdt->regmap) {
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dev_err(&pdev->dev, "failed to locate regmap\n");
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return -ENODEV;
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}
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err = device_property_read_u32(parent, "reg", &wdt->baseaddr);
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if (err) {
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dev_err(&pdev->dev, "failed to get pm8916-pon address\n");
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return err;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq > 0) {
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if (devm_request_irq(&pdev->dev, irq, pm8916_wdt_isr, 0,
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"pm8916_wdt", wdt))
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irq = 0;
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}
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/* Configure watchdog to hard-reset mode */
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err = regmap_write(wdt->regmap,
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wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL,
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RESET_TYPE_HARD);
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if (err) {
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dev_err(&pdev->dev, "failed configure watchdog\n");
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return err;
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}
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wdt->wdev.info = (irq > 0) ? &pm8916_wdt_pt_ident : &pm8916_wdt_ident,
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wdt->wdev.ops = &pm8916_wdt_ops,
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wdt->wdev.parent = &pdev->dev;
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wdt->wdev.min_timeout = PM8916_WDT_MIN_TIMEOUT;
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wdt->wdev.max_timeout = PM8916_WDT_MAX_TIMEOUT;
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wdt->wdev.timeout = PM8916_WDT_DEFAULT_TIMEOUT;
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wdt->wdev.pretimeout = 0;
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watchdog_set_drvdata(&wdt->wdev, wdt);
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watchdog_init_timeout(&wdt->wdev, 0, &pdev->dev);
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pm8916_wdt_configure_timers(&wdt->wdev);
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return devm_watchdog_register_device(&pdev->dev, &wdt->wdev);
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}
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static const struct of_device_id pm8916_wdt_id_table[] = {
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{ .compatible = "qcom,pm8916-wdt" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, pm8916_wdt_id_table);
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static struct platform_driver pm8916_wdt_driver = {
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.probe = pm8916_wdt_probe,
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.driver = {
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.name = "pm8916-wdt",
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.of_match_table = of_match_ptr(pm8916_wdt_id_table),
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},
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};
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module_platform_driver(pm8916_wdt_driver);
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MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro.org>");
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MODULE_DESCRIPTION("Qualcomm pm8916 watchdog driver");
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MODULE_LICENSE("GPL v2");
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