From: Guenter Roeck <linux@roeck-us.net>
To: Anson Huang <anson.huang@nxp.com>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
"will.deacon@arm.com" <will.deacon@arm.com>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
"festevam@gmail.com" <festevam@gmail.com>,
"wim@linux-watchdog.org" <wim@linux-watchdog.org>,
Andy Gross <andy.gross@linaro.org>,
"heiko@sntech.de" <heiko@sntech.de>,
"horms+renesas@verge.net.au" <horms+renesas@verge.net.au>,
"arnd@arndb.de" <arnd@arndb.de>,
"maxime.ripard@bootlin.com" <maxime.ripard@bootlin.com>,
"jagan@amarulasolutions.com" <jagan@amarulasolutions.com>,
"bjorn.andersson@linaro.org" <bjorn.andersson@linaro.org>,
"enric.balletbo@collabora.com" <enric.balletbo@collabora.com>,
"marc.w.gonzalez@free.fr" <marc.w.gonzalez@free.fr>,
"olof@lixom.net" <olof@lixom.net>,
Aisheng Dong <aisheng.dong@nxp.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-watchdog@vger.kernel.org" <linux-watchdog@vger.kernel.org>
Cc: dl-linux-imx <linux-imx@nxp.com>
Subject: Re: [PATCH V7 1/3] watchdog: imx_sc: Add i.MX system controller watchdog support
Date: Wed, 6 Mar 2019 08:06:07 -0800 [thread overview]
Message-ID: <9b850967-d90a-5bd8-6ecf-99819f95805e@roeck-us.net> (raw)
In-Reply-To: <1551834095-19950-1-git-send-email-Anson.Huang@nxp.com>
On 3/5/19 5:06 PM, Anson Huang wrote:
> i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
> inside, the system controller is in charge of controlling power,
> clock and watchdog etc..
>
> This patch adds i.MX system controller watchdog driver support,
> watchdog operation needs to be done in secure EL3 mode via
> ARM-Trusted-Firmware, using SMC call, CPU will trap into
> ARM-Trusted-Firmware and then it will request system controller
> to do watchdog operation via IPC.
>
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Guenter Roeck <linux@roekc-us.net>
> ---
> Changes since V6:
> - use module_platform_driver() instead of module_init/exit to make code simple.
> ---
> drivers/watchdog/Kconfig | 14 ++++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/imx_sc_wdt.c | 174 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 189 insertions(+)
> create mode 100644 drivers/watchdog/imx_sc_wdt.c
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 242eea8..33a6523 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -641,6 +641,20 @@ config IMX2_WDT
> To compile this driver as a module, choose M here: the
> module will be called imx2_wdt.
>
> +config IMX_SC_WDT
> + tristate "IMX SC Watchdog"
> + depends on IMX_SCU
> + depends on HAVE_ARM_SMCCC
> + select WATCHDOG_CORE
> + help
> + This is the driver for the system controller watchdog
> + on the NXP i.MX SoCs with system controller inside.
> + If you have one of these processors and wish to have
> + watchdog support enabled, say Y, otherwise say N.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called imx_sc_wdt.
> +
> config UX500_WATCHDOG
> tristate "ST-Ericsson Ux500 watchdog"
> depends on MFD_DB8500_PRCMU
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index ba930e4..136d9f0 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -68,6 +68,7 @@ obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
> obj-$(CONFIG_TS4800_WATCHDOG) += ts4800_wdt.o
> obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
> obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
> +obj-$(CONFIG_IMX_SC_WDT) += imx_sc_wdt.o
> obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
> obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
> obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o
> diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c
> new file mode 100644
> index 0000000..ee48709
> --- /dev/null
> +++ b/drivers/watchdog/imx_sc_wdt.c
> @@ -0,0 +1,174 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2018-2019 NXP.
> + */
> +
> +#include <linux/arm-smccc.h>
> +#include <linux/io.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +#include <linux/platform_device.h>
> +#include <linux/reboot.h>
> +#include <linux/watchdog.h>
> +
> +#define DEFAULT_TIMEOUT 60
> +/*
> + * Software timer tick implemented in scfw side, support 10ms to 0xffffffff ms
> + * in theory, but for normal case, 1s~128s is enough, you can change this max
> + * value in case it's not enough.
> + */
> +#define MAX_TIMEOUT 128
> +
> +#define IMX_SIP_TIMER 0xC2000002
> +#define IMX_SIP_TIMER_START_WDOG 0x01
> +#define IMX_SIP_TIMER_STOP_WDOG 0x02
> +#define IMX_SIP_TIMER_SET_WDOG_ACT 0x03
> +#define IMX_SIP_TIMER_PING_WDOG 0x04
> +#define IMX_SIP_TIMER_SET_TIMEOUT_WDOG 0x05
> +#define IMX_SIP_TIMER_GET_WDOG_STAT 0x06
> +#define IMX_SIP_TIMER_SET_PRETIME_WDOG 0x07
> +
> +#define SC_TIMER_WDOG_ACTION_PARTITION 0
> +
> +static bool nowayout = WATCHDOG_NOWAYOUT;
> +module_param(nowayout, bool, 0000);
> +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
> + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> +
> +static unsigned int timeout = DEFAULT_TIMEOUT;
> +module_param(timeout, uint, 0000);
> +MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
> + __MODULE_STRING(DEFAULT_TIMEOUT) ")");
> +
> +static int imx_sc_wdt_ping(struct watchdog_device *wdog)
> +{
> + struct arm_smccc_res res;
> +
> + arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_PING_WDOG,
> + 0, 0, 0, 0, 0, 0, &res);
> +
> + return 0;
> +}
> +
> +static int imx_sc_wdt_start(struct watchdog_device *wdog)
> +{
> + struct arm_smccc_res res;
> +
> + arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_START_WDOG,
> + 0, 0, 0, 0, 0, 0, &res);
> + if (res.a0)
> + return -EACCES;
> +
> + arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_WDOG_ACT,
> + SC_TIMER_WDOG_ACTION_PARTITION,
> + 0, 0, 0, 0, 0, &res);
> + return res.a0 ? -EACCES : 0;
> +}
> +
> +static int imx_sc_wdt_stop(struct watchdog_device *wdog)
> +{
> + struct arm_smccc_res res;
> +
> + arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_STOP_WDOG,
> + 0, 0, 0, 0, 0, 0, &res);
> +
> + return res.a0 ? -EACCES : 0;
> +}
> +
> +static int imx_sc_wdt_set_timeout(struct watchdog_device *wdog,
> + unsigned int timeout)
> +{
> + struct arm_smccc_res res;
> +
> + wdog->timeout = timeout;
> + arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_TIMEOUT_WDOG,
> + timeout * 1000, 0, 0, 0, 0, 0, &res);
> +
> + return res.a0 ? -EACCES : 0;
> +}
> +
> +static const struct watchdog_ops imx_sc_wdt_ops = {
> + .owner = THIS_MODULE,
> + .start = imx_sc_wdt_start,
> + .stop = imx_sc_wdt_stop,
> + .ping = imx_sc_wdt_ping,
> + .set_timeout = imx_sc_wdt_set_timeout,
> +};
> +
> +static const struct watchdog_info imx_sc_wdt_info = {
> + .identity = "i.MX SC watchdog timer",
> + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
> + WDIOF_MAGICCLOSE | WDIOF_PRETIMEOUT,
> +};
> +
> +static int imx_sc_wdt_probe(struct platform_device *pdev)
> +{
> + struct watchdog_device *imx_sc_wdd;
> + int ret;
> +
> + imx_sc_wdd = devm_kzalloc(&pdev->dev, sizeof(*imx_sc_wdd), GFP_KERNEL);
> + if (!imx_sc_wdd)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, imx_sc_wdd);
> +
> + imx_sc_wdd->info = &imx_sc_wdt_info;
> + imx_sc_wdd->ops = &imx_sc_wdt_ops;
> + imx_sc_wdd->min_timeout = 1;
> + imx_sc_wdd->max_timeout = MAX_TIMEOUT;
> + imx_sc_wdd->parent = &pdev->dev;
> + imx_sc_wdd->timeout = DEFAULT_TIMEOUT;
> +
> + ret = watchdog_init_timeout(imx_sc_wdd, timeout, &pdev->dev);
> + if (ret)
> + dev_warn(&pdev->dev, "Failed to set timeout value, using default\n");
> +
> + watchdog_stop_on_reboot(imx_sc_wdd);
> + watchdog_stop_on_unregister(imx_sc_wdd);
> +
> + ret = devm_watchdog_register_device(&pdev->dev, imx_sc_wdd);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to register watchdog device\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int __maybe_unused imx_sc_wdt_suspend(struct device *dev)
> +{
> + struct watchdog_device *imx_sc_wdd = dev_get_drvdata(dev);
> +
> + if (watchdog_active(imx_sc_wdd))
> + imx_sc_wdt_stop(imx_sc_wdd);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused imx_sc_wdt_resume(struct device *dev)
> +{
> + struct watchdog_device *imx_sc_wdd = dev_get_drvdata(dev);
> +
> + if (watchdog_active(imx_sc_wdd))
> + imx_sc_wdt_start(imx_sc_wdd);
> +
> + return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(imx_sc_wdt_pm_ops,
> + imx_sc_wdt_suspend, imx_sc_wdt_resume);
> +
> +static struct platform_driver imx_sc_wdt_driver = {
> + .probe = imx_sc_wdt_probe,
> + .driver = {
> + .name = "imx-sc-wdt",
> + .pm = &imx_sc_wdt_pm_ops,
> + },
> +};
> +module_platform_driver(imx_sc_wdt_driver);
> +
> +MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
> +MODULE_DESCRIPTION("NXP i.MX system controller watchdog driver");
> +MODULE_LICENSE("GPL v2");
>
next prev parent reply other threads:[~2019-03-06 16:06 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-06 1:06 [PATCH V7 1/3] watchdog: imx_sc: Add i.MX system controller watchdog support Anson Huang
2019-03-06 1:06 ` [PATCH V7 2/3] arm64: defconfig: add support for i.MX system controller watchdog Anson Huang
2019-03-06 16:06 ` Guenter Roeck
2019-03-06 1:06 ` [PATCH V7 3/3] firmware: imx: imx-scu: register build-in child devices Anson Huang
2019-03-06 16:05 ` Guenter Roeck
2019-03-07 0:46 ` Anson Huang
2019-03-07 12:26 ` Aisheng Dong
2019-03-06 16:06 ` Guenter Roeck [this message]
2019-03-07 13:33 ` [PATCH V7 1/3] watchdog: imx_sc: Add i.MX system controller watchdog support Aisheng Dong
2019-03-07 13:56 ` Anson Huang
2019-03-07 13:59 ` Aisheng Dong
2019-03-07 14:13 ` Anson Huang
2019-03-08 2:25 ` Aisheng Dong
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