From: Guenter Roeck <linux@roeck-us.net>
To: Loic Poulain <loic.poulain@linaro.org>,
wim@linux-watchdog.org, robh+dt@kernel.org
Cc: linux-arm-msm@vger.kernel.org, linux-watchdog@vger.kernel.org,
devicetree@vger.kernel.org, andy.gross@linaro.org
Subject: Re: [PATCH v3 1/3] watchdog: Add pm8916 watchdog driver
Date: Fri, 23 Nov 2018 08:36:57 -0800 [thread overview]
Message-ID: <e57ef0c9-5b9e-06a9-f168-8ad83129f23e@roeck-us.net> (raw)
In-Reply-To: <1542962678-13697-1-git-send-email-loic.poulain@linaro.org>
On 11/23/18 12:44 AM, Loic Poulain wrote:
> 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>
> ---
> v2: SPDX license
> headers ordering
> coding styles / tabs / multi-line comments
> pretimeout / bark interrupt
> WDIOF_MAGICCLOSE flag
> timeout init via fdt
> devm usage
> v3: Remove unused dev/irq variables from pm8916 wdt struct
>
> drivers/watchdog/Kconfig | 8 ++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/pm8916_wdt.c | 211 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 220 insertions(+)
> create mode 100644 drivers/watchdog/pm8916_wdt.c
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 2d64333..ef2c2b5 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -847,6 +847,14 @@ config SPRD_WATCHDOG
> Say Y here to include watchdog timer supported
> by Spreadtrum system.
>
> +config PM8916_WATCHDOG
> + tristate "QCOM PM8916 pmic watchdog"
> + depends on OF && MFD_SPMI_PMIC
> + select WATCHDOG_CORE
> + help
> + Say Y here to include support watchdog timer embedded into the
> + pm8916 module.
> +
> # X86 (i386 + ia64 + x86_64) Architecture
>
> config ACQUIRE_WDT
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index f69cdff..cc90e72 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -92,6 +92,7 @@ obj-$(CONFIG_STM32_WATCHDOG) += stm32_iwdg.o
> obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o
> obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o
> obj-$(CONFIG_SPRD_WATCHDOG) += sprd_wdt.o
> +obj-$(CONFIG_PM8916_WATCHDOG) += pm8916_wdt.o
>
> # X86 (i386 + ia64 + x86_64) Architecture
> obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
> diff --git a/drivers/watchdog/pm8916_wdt.c b/drivers/watchdog/pm8916_wdt.c
> new file mode 100644
> index 0000000..7f10041
> --- /dev/null
> +++ b/drivers/watchdog/pm8916_wdt.c
> @@ -0,0 +1,211 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <linux/bitops.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/property.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/watchdog.h>
> +
> +#define PON_INT_RT_STS 0x10
> +#define PMIC_WD_BARK_STS_BIT BIT(6)
> +
> +#define PON_PMIC_WD_RESET_S1_TIMER 0x54
> +#define PON_PMIC_WD_RESET_S2_TIMER 0x55
> +
> +#define PON_PMIC_WD_RESET_S2_CTL 0x56
> +#define RESET_TYPE_WARM 0x01
> +#define RESET_TYPE_SHUTDOWN 0x04
> +#define RESET_TYPE_HARD 0x07
> +
> +#define PON_PMIC_WD_RESET_S2_CTL2 0x57
> +#define S2_RESET_EN_BIT BIT(7)
> +
> +#define PON_PMIC_WD_RESET_PET 0x58
> +#define WATCHDOG_PET_BIT BIT(0)
> +
> +#define PM8916_WDT_DEFAULT_TIMEOUT 32
> +#define PM8916_WDT_MIN_TIMEOUT 1
> +#define PM8916_WDT_MAX_TIMEOUT 127
> +
> +struct pm8916_wdt {
> + struct regmap *regmap;
> + struct watchdog_device wdev;
> + u32 baseaddr;
> +};
> +
> +static int pm8916_wdt_start(struct watchdog_device *wdev)
> +{
> + struct pm8916_wdt *wdt = watchdog_get_drvdata(wdev);
> +
> + return regmap_update_bits(wdt->regmap,
> + wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL2,
> + S2_RESET_EN_BIT, S2_RESET_EN_BIT);
> +}
> +
> +static int pm8916_wdt_stop(struct watchdog_device *wdev)
> +{
> + struct pm8916_wdt *wdt = watchdog_get_drvdata(wdev);
> +
> + return regmap_update_bits(wdt->regmap,
> + wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL2,
> + S2_RESET_EN_BIT, 0);
> +}
> +
> +static int pm8916_wdt_ping(struct watchdog_device *wdev)
> +{
> + struct pm8916_wdt *wdt = watchdog_get_drvdata(wdev);
> +
> + return regmap_update_bits(wdt->regmap,
> + wdt->baseaddr + PON_PMIC_WD_RESET_PET,
> + WATCHDOG_PET_BIT, WATCHDOG_PET_BIT);
> +}
> +
> +static int pm8916_wdt_configure_timers(struct watchdog_device *wdev)
> +{
> + struct pm8916_wdt *wdt = watchdog_get_drvdata(wdev);
> + int err;
> +
> + err = regmap_write(wdt->regmap,
> + wdt->baseaddr + PON_PMIC_WD_RESET_S1_TIMER,
> + wdev->timeout - wdev->pretimeout);
> + if (err)
> + return err;
> +
> + return regmap_write(wdt->regmap,
> + wdt->baseaddr + PON_PMIC_WD_RESET_S2_TIMER,
> + wdev->pretimeout);
> +}
> +
> +static int pm8916_wdt_set_timeout(struct watchdog_device *wdev,
> + unsigned int timeout)
> +{
> + wdev->timeout = timeout;
> +
> + return pm8916_wdt_configure_timers(wdev);
> +}
> +
> +static int pm8916_wdt_set_pretimeout(struct watchdog_device *wdev,
> + unsigned int pretimeout)
> +{
> + wdev->pretimeout = pretimeout;
> +
> + return pm8916_wdt_configure_timers(wdev);
> +}
> +
> +static irqreturn_t pm8916_wdt_isr(int irq, void *arg)
> +{
> + struct pm8916_wdt *wdt = arg;
> + int err, sts;
> +
> + err = regmap_read(wdt->regmap, wdt->baseaddr + PON_INT_RT_STS, &sts);
> + if (err)
> + return IRQ_HANDLED;
> +
> + if (sts & PMIC_WD_BARK_STS_BIT)
> + watchdog_notify_pretimeout(&wdt->wdev);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static const struct watchdog_info pm8916_wdt_ident = {
> + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
> + .identity = "QCOM PM8916 PON WDT",
> +};
> +
> +static const struct watchdog_info pm8916_wdt_pt_ident = {
> + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE |
> + WDIOF_PRETIMEOUT,
> + .identity = "QCOM PM8916 PON WDT",
> +};
> +
> +static const struct watchdog_ops pm8916_wdt_ops = {
> + .owner = THIS_MODULE,
> + .start = pm8916_wdt_start,
> + .stop = pm8916_wdt_stop,
> + .ping = pm8916_wdt_ping,
> + .set_timeout = pm8916_wdt_set_timeout,
> + .set_pretimeout = pm8916_wdt_set_pretimeout,
> +};
> +
> +static int pm8916_wdt_probe(struct platform_device *pdev)
> +{
> + struct pm8916_wdt *wdt;
> + struct device *parent;
> + int err, irq;
> +
> + wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
> + if (!wdt)
> + return -ENOMEM;
> +
> + parent = pdev->dev.parent;
> +
> + /*
> + * The pm8916-pon-wdt is a child of the pon device, which is a child
> + * of the pm8916 mfd device. We want access to the pm8916 registers.
> + * Retrieve regmap from pm8916 (parent->parent) and base address
> + * from pm8916-pon (pon).
> + */
> + wdt->regmap = dev_get_regmap(parent->parent, NULL);
> + if (!wdt->regmap) {
> + dev_err(&pdev->dev, "failed to locate regmap\n");
> + return -ENODEV;
> + }
> +
> + err = device_property_read_u32(parent, "reg", &wdt->baseaddr);
> + if (err) {
> + dev_err(&pdev->dev, "failed to get pm8916-pon address\n");
> + return err;
> + }
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq > 0) {
> + if (devm_request_irq(&pdev->dev, irq, pm8916_wdt_isr, 0,
> + "pm8916_wdt", wdt))
> + irq = 0;
> + }
> +
> + /* Configure watchdog to hard-reset mode */
> + err = regmap_write(wdt->regmap,
> + wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL,
> + RESET_TYPE_HARD);
> + if (err) {
> + dev_err(&pdev->dev, "failed configure watchdog\n");
> + return err;
> + }
> +
> + wdt->wdev.info = (irq > 0) ? &pm8916_wdt_pt_ident : &pm8916_wdt_ident,
> + wdt->wdev.ops = &pm8916_wdt_ops,
> + wdt->wdev.parent = &pdev->dev;
> + wdt->wdev.min_timeout = PM8916_WDT_MIN_TIMEOUT;
> + wdt->wdev.max_timeout = PM8916_WDT_MAX_TIMEOUT;
> + wdt->wdev.timeout = PM8916_WDT_DEFAULT_TIMEOUT;
> + wdt->wdev.pretimeout = 0;
> + watchdog_set_drvdata(&wdt->wdev, wdt);
> +
> + watchdog_init_timeout(&wdt->wdev, 0, &pdev->dev);
> + pm8916_wdt_configure_timers(&wdt->wdev);
> +
> + return devm_watchdog_register_device(&pdev->dev, &wdt->wdev);
> +}
> +
> +static const struct of_device_id pm8916_wdt_id_table[] = {
> + { .compatible = "qcom,pm8916-wdt" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, pm8916_wdt_id_table);
> +
> +static struct platform_driver pm8916_wdt_driver = {
> + .probe = pm8916_wdt_probe,
> + .driver = {
> + .name = "pm8916-wdt",
> + .of_match_table = of_match_ptr(pm8916_wdt_id_table),
> + },
> +};
> +module_platform_driver(pm8916_wdt_driver);
> +
> +MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro.org>");
> +MODULE_DESCRIPTION("Qualcomm pm8916 watchdog driver");
> +MODULE_LICENSE("GPL v2");
>
prev parent reply other threads:[~2018-11-24 3:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-23 8:44 [PATCH v3 1/3] watchdog: Add pm8916 watchdog driver Loic Poulain
2018-11-23 8:44 ` [PATCH v3 2/3] dt-bindings: watchdog: Add Qualcomm PM8916 watchdog Loic Poulain
2018-11-27 1:49 ` Rob Herring
2018-12-15 16:26 ` [v3,2/3] " Guenter Roeck
2018-11-23 8:44 ` [PATCH v3 3/3] arm64: dts: qcom: pm8916: Add PON watchdog node Loic Poulain
2018-12-15 16:27 ` [v3,3/3] " Guenter Roeck
2018-11-23 16:36 ` Guenter Roeck [this message]
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