mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 13:22:23 +00:00
2c50a6b825
SCU firmware calculates pretimeout based on current time stamp
instead of watchdog timeout stamp, need to convert the pretimeout
to SCU firmware's timeout value.
Fixes: 15f7d7fc55 ("watchdog: imx_sc: Add pretimeout support")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
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>
258 lines
6.3 KiB
C
258 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright 2018-2019 NXP.
|
|
*/
|
|
|
|
#include <linux/arm-smccc.h>
|
|
#include <linux/firmware/imx/sci.h>
|
|
#include <linux/io.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/of.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
|
|
|
|
#define SC_IRQ_WDOG 1
|
|
#define SC_IRQ_GROUP_WDOG 1
|
|
|
|
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) ")");
|
|
|
|
struct imx_sc_wdt_device {
|
|
struct watchdog_device wdd;
|
|
struct notifier_block wdt_notifier;
|
|
};
|
|
|
|
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 int imx_sc_wdt_set_pretimeout(struct watchdog_device *wdog,
|
|
unsigned int pretimeout)
|
|
{
|
|
struct arm_smccc_res res;
|
|
|
|
/*
|
|
* SCU firmware calculates pretimeout based on current time
|
|
* stamp instead of watchdog timeout stamp, need to convert
|
|
* the pretimeout to SCU firmware's timeout value.
|
|
*/
|
|
arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_PRETIME_WDOG,
|
|
(wdog->timeout - pretimeout) * 1000, 0, 0, 0,
|
|
0, 0, &res);
|
|
if (res.a0)
|
|
return -EACCES;
|
|
|
|
wdog->pretimeout = pretimeout;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx_sc_wdt_notify(struct notifier_block *nb,
|
|
unsigned long event, void *group)
|
|
{
|
|
struct imx_sc_wdt_device *imx_sc_wdd =
|
|
container_of(nb,
|
|
struct imx_sc_wdt_device,
|
|
wdt_notifier);
|
|
|
|
if (event & SC_IRQ_WDOG &&
|
|
*(u8 *)group == SC_IRQ_GROUP_WDOG)
|
|
watchdog_notify_pretimeout(&imx_sc_wdd->wdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void imx_sc_wdt_action(void *data)
|
|
{
|
|
struct notifier_block *wdt_notifier = data;
|
|
|
|
imx_scu_irq_unregister_notifier(wdt_notifier);
|
|
imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
|
|
SC_IRQ_WDOG,
|
|
false);
|
|
}
|
|
|
|
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,
|
|
.set_pretimeout = imx_sc_wdt_set_pretimeout,
|
|
};
|
|
|
|
static struct watchdog_info imx_sc_wdt_info = {
|
|
.identity = "i.MX SC watchdog timer",
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
|
|
WDIOF_MAGICCLOSE,
|
|
};
|
|
|
|
static int imx_sc_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
struct imx_sc_wdt_device *imx_sc_wdd;
|
|
struct watchdog_device *wdog;
|
|
struct device *dev = &pdev->dev;
|
|
int ret;
|
|
|
|
imx_sc_wdd = devm_kzalloc(dev, sizeof(*imx_sc_wdd), GFP_KERNEL);
|
|
if (!imx_sc_wdd)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, imx_sc_wdd);
|
|
|
|
wdog = &imx_sc_wdd->wdd;
|
|
wdog->info = &imx_sc_wdt_info;
|
|
wdog->ops = &imx_sc_wdt_ops;
|
|
wdog->min_timeout = 1;
|
|
wdog->max_timeout = MAX_TIMEOUT;
|
|
wdog->parent = dev;
|
|
wdog->timeout = DEFAULT_TIMEOUT;
|
|
|
|
watchdog_init_timeout(wdog, 0, dev);
|
|
watchdog_stop_on_reboot(wdog);
|
|
watchdog_stop_on_unregister(wdog);
|
|
|
|
ret = devm_watchdog_register_device(dev, wdog);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
|
|
SC_IRQ_WDOG,
|
|
true);
|
|
if (ret) {
|
|
dev_warn(dev, "Enable irq failed, pretimeout NOT supported\n");
|
|
return 0;
|
|
}
|
|
|
|
imx_sc_wdd->wdt_notifier.notifier_call = imx_sc_wdt_notify;
|
|
ret = imx_scu_irq_register_notifier(&imx_sc_wdd->wdt_notifier);
|
|
if (ret) {
|
|
imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
|
|
SC_IRQ_WDOG,
|
|
false);
|
|
dev_warn(dev,
|
|
"Register irq notifier failed, pretimeout NOT supported\n");
|
|
return 0;
|
|
}
|
|
|
|
ret = devm_add_action_or_reset(dev, imx_sc_wdt_action,
|
|
&imx_sc_wdd->wdt_notifier);
|
|
if (!ret)
|
|
imx_sc_wdt_info.options |= WDIOF_PRETIMEOUT;
|
|
else
|
|
dev_warn(dev, "Add action failed, pretimeout NOT supported\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused imx_sc_wdt_suspend(struct device *dev)
|
|
{
|
|
struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
|
|
|
|
if (watchdog_active(&imx_sc_wdd->wdd))
|
|
imx_sc_wdt_stop(&imx_sc_wdd->wdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused imx_sc_wdt_resume(struct device *dev)
|
|
{
|
|
struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
|
|
|
|
if (watchdog_active(&imx_sc_wdd->wdd))
|
|
imx_sc_wdt_start(&imx_sc_wdd->wdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(imx_sc_wdt_pm_ops,
|
|
imx_sc_wdt_suspend, imx_sc_wdt_resume);
|
|
|
|
static const struct of_device_id imx_sc_wdt_dt_ids[] = {
|
|
{ .compatible = "fsl,imx-sc-wdt", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, imx_sc_wdt_dt_ids);
|
|
|
|
static struct platform_driver imx_sc_wdt_driver = {
|
|
.probe = imx_sc_wdt_probe,
|
|
.driver = {
|
|
.name = "imx-sc-wdt",
|
|
.of_match_table = imx_sc_wdt_dt_ids,
|
|
.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");
|