mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
b1413e6edc
Add suspend and resume pm operations. Tested on dragonboard-410c. Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/1581435483-6796-1-git-send-email-loic.poulain@linaro.org Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
245 lines
6.0 KiB
C
245 lines
6.0 KiB
C
// 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 device *dev = &pdev->dev;
|
|
struct pm8916_wdt *wdt;
|
|
struct device *parent;
|
|
int err, irq;
|
|
|
|
wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
|
|
if (!wdt)
|
|
return -ENOMEM;
|
|
|
|
parent = 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(dev, "failed to locate regmap\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
err = device_property_read_u32(parent, "reg", &wdt->baseaddr);
|
|
if (err) {
|
|
dev_err(dev, "failed to get pm8916-pon address\n");
|
|
return err;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq > 0) {
|
|
err = devm_request_irq(dev, irq, pm8916_wdt_isr, 0,
|
|
"pm8916_wdt", wdt);
|
|
if (err)
|
|
return err;
|
|
|
|
wdt->wdev.info = &pm8916_wdt_pt_ident;
|
|
} else {
|
|
if (irq == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
|
|
wdt->wdev.info = &pm8916_wdt_ident;
|
|
}
|
|
|
|
/* 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(dev, "failed configure watchdog\n");
|
|
return err;
|
|
}
|
|
|
|
wdt->wdev.ops = &pm8916_wdt_ops,
|
|
wdt->wdev.parent = 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);
|
|
platform_set_drvdata(pdev, wdt);
|
|
|
|
watchdog_init_timeout(&wdt->wdev, 0, dev);
|
|
pm8916_wdt_configure_timers(&wdt->wdev);
|
|
|
|
return devm_watchdog_register_device(dev, &wdt->wdev);
|
|
}
|
|
|
|
static int __maybe_unused pm8916_wdt_suspend(struct device *dev)
|
|
{
|
|
struct pm8916_wdt *wdt = dev_get_drvdata(dev);
|
|
|
|
if (watchdog_active(&wdt->wdev))
|
|
return pm8916_wdt_stop(&wdt->wdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused pm8916_wdt_resume(struct device *dev)
|
|
{
|
|
struct pm8916_wdt *wdt = dev_get_drvdata(dev);
|
|
|
|
if (watchdog_active(&wdt->wdev))
|
|
return pm8916_wdt_start(&wdt->wdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(pm8916_wdt_pm_ops, pm8916_wdt_suspend,
|
|
pm8916_wdt_resume);
|
|
|
|
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),
|
|
.pm = &pm8916_wdt_pm_ops,
|
|
},
|
|
};
|
|
module_platform_driver(pm8916_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro.org>");
|
|
MODULE_DESCRIPTION("Qualcomm pm8916 watchdog driver");
|
|
MODULE_LICENSE("GPL v2");
|