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/*
* Copyright (C) 2017 NXP.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*/
#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>
#include <soc/imx/fsl_sip.h>
#include <soc/imx8/sc/sci.h>
#include <soc/imx8/sc/svc/irq/api.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
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 struct watchdog_device imx8_wdd;
static int imx8_wdt_notify(struct notifier_block *nb,
unsigned long event, void *group)
{
/* ignore other irqs */
if (!(event & SC_IRQ_WDOG &&
(*(sc_irq_group_t *)group == SC_IRQ_GROUP_WDOG)))
return 0;
watchdog_notify_pretimeout(&imx8_wdd);
return 0;
}
static int imx8_wdt_ping(struct watchdog_device *wdog)
{
struct arm_smccc_res res;
arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_PING_WDOG, 0, 0, 0, 0, 0, 0,
&res);
return res.a0;
}
static int imx8_wdt_start(struct watchdog_device *wdog)
{
struct arm_smccc_res res;
/* no block */
arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_START_WDOG, 0, 0, 0, 0, 0, 0,
&res);
if (res.a0)
return res.a0;
/* TODO: change to SC_TIMER_WDOG_ACTION_PARTITION after SCFW support */
arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_WDOG_ACT,
SC_TIMER_WDOG_ACTION_BOARD, 0, 0, 0, 0, 0, &res);
return res.a0;
}
static int imx8_wdt_stop(struct watchdog_device *wdog)
{
struct arm_smccc_res res;
arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_STOP_WDOG, 0, 0, 0, 0, 0, 0,
&res);
return res.a0;
}
static int imx8_wdt_set_timeout(struct watchdog_device *wdog,
unsigned int timeout)
{
struct arm_smccc_res res;
wdog->timeout = timeout;
arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_TIMEOUT_WDOG,
timeout * 1000, 0, 0, 0, 0, 0, &res);
return res.a0;
}
static int imx8_wdt_set_pretimeout(struct watchdog_device *wdog,
unsigned int new_pretimeout)
{
struct arm_smccc_res res;
arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_PRETIME_WDOG,
new_pretimeout * 1000, 0, 0, 0, 0, 0,
&res);
return res.a0;
}
static const struct watchdog_ops imx8_wdt_ops = {
.owner = THIS_MODULE,
.start = imx8_wdt_start,
.stop = imx8_wdt_stop,
.ping = imx8_wdt_ping,
.set_timeout = imx8_wdt_set_timeout,
.set_pretimeout = imx8_wdt_set_pretimeout,
};
static const struct watchdog_info imx8_wdt_info = {
.identity = "i.MX8 watchdog timer",
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE | WDIOF_PRETIMEOUT,
};
static struct notifier_block imx8_wdt_notifier = {
.notifier_call = imx8_wdt_notify,
};
#ifdef CONFIG_PM_SLEEP
static int imx8_wdt_suspend(struct device *dev)
{
if (test_bit(WDOG_ACTIVE, &imx8_wdd.status))
imx8_wdt_stop(&imx8_wdd);
return 0;
}
static int imx8_wdt_resume(struct device *dev)
{
if (test_bit(WDOG_ACTIVE, &imx8_wdd.status))
imx8_wdt_start(&imx8_wdd);
return 0;
}
static const struct dev_pm_ops imx8_wdt_pm_ops = {
.suspend = imx8_wdt_suspend,
.resume = imx8_wdt_resume,
};
#define IMX8_WDT_PM_OPS (&imx8_wdt_pm_ops)
#else
#define IMX8_WDT_PM_OPS NULL
#endif
static int imx8_wdt_probe(struct platform_device *pdev)
{
struct watchdog_device *wdt = &imx8_wdd;
int err;
platform_set_drvdata(pdev, wdt);
/* init the wdd */
wdt->info = &imx8_wdt_info;
wdt->ops = &imx8_wdt_ops;
wdt->min_timeout = 1;
wdt->max_timeout = MAX_TIMEOUT;
wdt->parent = &pdev->dev;
watchdog_set_drvdata(wdt, NULL);
err = watchdog_init_timeout(wdt, DEFAULT_TIMEOUT, &pdev->dev);
if (err) {
dev_err(&pdev->dev, "Failed to init the wdog timeout:%d\n",
err);
return err;
}
err = watchdog_register_device(wdt);
if (err) {
dev_err(&pdev->dev, "Failed to register watchdog device\n");
return err;
}
return register_scu_notifier(&imx8_wdt_notifier);
}
static int imx8_wdt_remove(struct platform_device *pdev)
{
struct watchdog_device *wdt = platform_get_drvdata(pdev);
imx8_wdt_stop(wdt);
watchdog_unregister_device(wdt);
return 0;
}
static void imx8_wdt_shutdown(struct platform_device *pdev)
{
struct watchdog_device *wdt = platform_get_drvdata(pdev);
if (watchdog_active(wdt))
imx8_wdt_stop(wdt);
}
static const struct of_device_id imx8_wdt_dt_ids[] = {
{ .compatible = "fsl,imx8-wdt", },
{ /*sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx8_wdt_dt_ids);
static struct platform_driver imx8_wdt_driver = {
.probe = imx8_wdt_probe,
.remove = imx8_wdt_remove,
.shutdown = imx8_wdt_shutdown,
.driver = {
.name = "imx8-wdt",
.of_match_table = imx8_wdt_dt_ids,
.pm = IMX8_WDT_PM_OPS,
},
};
module_platform_driver(imx8_wdt_driver);
MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
MODULE_DESCRIPTION("NXP i.MX8 watchdog driver");
MODULE_LICENSE("GPL v2");
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