mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
2e62c4988b
- Add SPDX identifier - Remove boiler plate license text - If MODULE_LICENSE and boiler plate does not match, go for boiler plate license Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com> Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Acked-by: Baruch Siach <baruch@tkos.co.il> Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com> Acked-by: Keiji Hayashibara <hayashibara.keiji@socionext.com> Acked-by: Johannes Thumshirn <jth@kernel.org> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Mans Rullgard <mans@mansr.com> Acked-by: Matthias Brugger <matthias.bgg@gmail.com> Acked-by: Michal Simek <michal.simek@xilinx.com> Acked-by: Neil Armstrong <narmstrong@baylibre.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Acked-by: Thierry Reding <treding@nvidia.com> Acked-by: Tomas Winkler <tomas.winkler@intel.com> Acked-by: Patrice Chotard <patrice.chotard@st.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
294 lines
6.9 KiB
C
294 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Watchdog driver for the wm831x PMICs
|
|
*
|
|
* Copyright (C) 2009 Wolfson Microelectronics
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#include <linux/mfd/wm831x/core.h>
|
|
#include <linux/mfd/wm831x/pdata.h>
|
|
#include <linux/mfd/wm831x/watchdog.h>
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout,
|
|
"Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
struct wm831x_wdt_drvdata {
|
|
struct watchdog_device wdt;
|
|
struct wm831x *wm831x;
|
|
struct mutex lock;
|
|
int update_gpio;
|
|
int update_state;
|
|
};
|
|
|
|
/* We can't use the sub-second values here but they're included
|
|
* for completeness. */
|
|
static struct {
|
|
unsigned int time; /* Seconds */
|
|
u16 val; /* WDOG_TO value */
|
|
} wm831x_wdt_cfgs[] = {
|
|
{ 1, 2 },
|
|
{ 2, 3 },
|
|
{ 4, 4 },
|
|
{ 8, 5 },
|
|
{ 16, 6 },
|
|
{ 32, 7 },
|
|
{ 33, 7 }, /* Actually 32.768s so include both, others round down */
|
|
};
|
|
|
|
static int wm831x_wdt_start(struct watchdog_device *wdt_dev)
|
|
{
|
|
struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev);
|
|
struct wm831x *wm831x = driver_data->wm831x;
|
|
int ret;
|
|
|
|
mutex_lock(&driver_data->lock);
|
|
|
|
ret = wm831x_reg_unlock(wm831x);
|
|
if (ret == 0) {
|
|
ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
|
|
WM831X_WDOG_ENA, WM831X_WDOG_ENA);
|
|
wm831x_reg_lock(wm831x);
|
|
} else {
|
|
dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
|
|
ret);
|
|
}
|
|
|
|
mutex_unlock(&driver_data->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int wm831x_wdt_stop(struct watchdog_device *wdt_dev)
|
|
{
|
|
struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev);
|
|
struct wm831x *wm831x = driver_data->wm831x;
|
|
int ret;
|
|
|
|
mutex_lock(&driver_data->lock);
|
|
|
|
ret = wm831x_reg_unlock(wm831x);
|
|
if (ret == 0) {
|
|
ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
|
|
WM831X_WDOG_ENA, 0);
|
|
wm831x_reg_lock(wm831x);
|
|
} else {
|
|
dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
|
|
ret);
|
|
}
|
|
|
|
mutex_unlock(&driver_data->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int wm831x_wdt_ping(struct watchdog_device *wdt_dev)
|
|
{
|
|
struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev);
|
|
struct wm831x *wm831x = driver_data->wm831x;
|
|
int ret;
|
|
u16 reg;
|
|
|
|
mutex_lock(&driver_data->lock);
|
|
|
|
if (driver_data->update_gpio) {
|
|
gpio_set_value_cansleep(driver_data->update_gpio,
|
|
driver_data->update_state);
|
|
driver_data->update_state = !driver_data->update_state;
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG);
|
|
|
|
if (!(reg & WM831X_WDOG_RST_SRC)) {
|
|
dev_err(wm831x->dev, "Hardware watchdog update unsupported\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
reg |= WM831X_WDOG_RESET;
|
|
|
|
ret = wm831x_reg_unlock(wm831x);
|
|
if (ret == 0) {
|
|
ret = wm831x_reg_write(wm831x, WM831X_WATCHDOG, reg);
|
|
wm831x_reg_lock(wm831x);
|
|
} else {
|
|
dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
|
|
ret);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&driver_data->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int wm831x_wdt_set_timeout(struct watchdog_device *wdt_dev,
|
|
unsigned int timeout)
|
|
{
|
|
struct wm831x_wdt_drvdata *driver_data = watchdog_get_drvdata(wdt_dev);
|
|
struct wm831x *wm831x = driver_data->wm831x;
|
|
int ret, i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++)
|
|
if (wm831x_wdt_cfgs[i].time == timeout)
|
|
break;
|
|
if (i == ARRAY_SIZE(wm831x_wdt_cfgs))
|
|
return -EINVAL;
|
|
|
|
ret = wm831x_reg_unlock(wm831x);
|
|
if (ret == 0) {
|
|
ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
|
|
WM831X_WDOG_TO_MASK,
|
|
wm831x_wdt_cfgs[i].val);
|
|
wm831x_reg_lock(wm831x);
|
|
} else {
|
|
dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
|
|
ret);
|
|
}
|
|
|
|
wdt_dev->timeout = timeout;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct watchdog_info wm831x_wdt_info = {
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
|
.identity = "WM831x Watchdog",
|
|
};
|
|
|
|
static const struct watchdog_ops wm831x_wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = wm831x_wdt_start,
|
|
.stop = wm831x_wdt_stop,
|
|
.ping = wm831x_wdt_ping,
|
|
.set_timeout = wm831x_wdt_set_timeout,
|
|
};
|
|
|
|
static int wm831x_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
|
|
struct wm831x_pdata *chip_pdata = dev_get_platdata(pdev->dev.parent);
|
|
struct wm831x_watchdog_pdata *pdata;
|
|
struct wm831x_wdt_drvdata *driver_data;
|
|
struct watchdog_device *wm831x_wdt;
|
|
int reg, ret, i;
|
|
|
|
ret = wm831x_reg_read(wm831x, WM831X_WATCHDOG);
|
|
if (ret < 0) {
|
|
dev_err(wm831x->dev, "Failed to read watchdog status: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
reg = ret;
|
|
|
|
if (reg & WM831X_WDOG_DEBUG)
|
|
dev_warn(wm831x->dev, "Watchdog is paused\n");
|
|
|
|
driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
|
|
GFP_KERNEL);
|
|
if (!driver_data)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&driver_data->lock);
|
|
driver_data->wm831x = wm831x;
|
|
|
|
wm831x_wdt = &driver_data->wdt;
|
|
|
|
wm831x_wdt->info = &wm831x_wdt_info;
|
|
wm831x_wdt->ops = &wm831x_wdt_ops;
|
|
wm831x_wdt->parent = &pdev->dev;
|
|
watchdog_set_nowayout(wm831x_wdt, nowayout);
|
|
watchdog_set_drvdata(wm831x_wdt, driver_data);
|
|
|
|
reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG);
|
|
reg &= WM831X_WDOG_TO_MASK;
|
|
for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++)
|
|
if (wm831x_wdt_cfgs[i].val == reg)
|
|
break;
|
|
if (i == ARRAY_SIZE(wm831x_wdt_cfgs))
|
|
dev_warn(wm831x->dev,
|
|
"Unknown watchdog timeout: %x\n", reg);
|
|
else
|
|
wm831x_wdt->timeout = wm831x_wdt_cfgs[i].time;
|
|
|
|
/* Apply any configuration */
|
|
if (chip_pdata)
|
|
pdata = chip_pdata->watchdog;
|
|
else
|
|
pdata = NULL;
|
|
|
|
if (pdata) {
|
|
reg &= ~(WM831X_WDOG_SECACT_MASK | WM831X_WDOG_PRIMACT_MASK |
|
|
WM831X_WDOG_RST_SRC);
|
|
|
|
reg |= pdata->primary << WM831X_WDOG_PRIMACT_SHIFT;
|
|
reg |= pdata->secondary << WM831X_WDOG_SECACT_SHIFT;
|
|
reg |= pdata->software << WM831X_WDOG_RST_SRC_SHIFT;
|
|
|
|
if (pdata->update_gpio) {
|
|
ret = devm_gpio_request_one(&pdev->dev,
|
|
pdata->update_gpio,
|
|
GPIOF_OUT_INIT_LOW,
|
|
"Watchdog update");
|
|
if (ret < 0) {
|
|
dev_err(wm831x->dev,
|
|
"Failed to request update GPIO: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
driver_data->update_gpio = pdata->update_gpio;
|
|
|
|
/* Make sure the watchdog takes hardware updates */
|
|
reg |= WM831X_WDOG_RST_SRC;
|
|
}
|
|
|
|
ret = wm831x_reg_unlock(wm831x);
|
|
if (ret == 0) {
|
|
ret = wm831x_reg_write(wm831x, WM831X_WATCHDOG, reg);
|
|
wm831x_reg_lock(wm831x);
|
|
} else {
|
|
dev_err(wm831x->dev,
|
|
"Failed to unlock security key: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ret = devm_watchdog_register_device(&pdev->dev, &driver_data->wdt);
|
|
if (ret != 0) {
|
|
dev_err(wm831x->dev, "watchdog_register_device() failed: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver wm831x_wdt_driver = {
|
|
.probe = wm831x_wdt_probe,
|
|
.driver = {
|
|
.name = "wm831x-watchdog",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(wm831x_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Mark Brown");
|
|
MODULE_DESCRIPTION("WM831x Watchdog");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:wm831x-watchdog");
|