* warranty of any kind, whether express or implied.
*/
-#include <linux/fs.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/miscdevice.h>
-#include <linux/mutex.h>
#include <linux/platform_device.h>
-#include <linux/slab.h>
+#include <linux/module.h>
#include <linux/watchdog.h>
-#include <linux/uaccess.h>
+#include <linux/io.h>
-#define TS72XX_WDT_FEED_VAL 0x05
-#define TS72XX_WDT_DEFAULT_TIMEOUT 8
+#define TS72XX_WDT_DEFAULT_TIMEOUT 30
-static int timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
+static int timeout;
module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. "
- "(1 <= timeout <= 8, default="
- __MODULE_STRING(TS72XX_WDT_DEFAULT_TIMEOUT)
- ")");
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds.");
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
-/**
- * struct ts72xx_wdt - watchdog control structure
- * @lock: lock that protects this structure
- * @regval: watchdog timeout value suitable for control register
- * @flags: flags controlling watchdog device state
- * @control_reg: watchdog control register
- * @feed_reg: watchdog feed register
- * @pdev: back pointer to platform dev
- */
-struct ts72xx_wdt {
- struct mutex lock;
- int regval;
-
-#define TS72XX_WDT_BUSY_FLAG 1
-#define TS72XX_WDT_EXPECT_CLOSE_FLAG 2
- int flags;
+/* priv->control_reg */
+#define TS72XX_WDT_CTRL_DISABLE 0x00
+#define TS72XX_WDT_CTRL_250MS 0x01
+#define TS72XX_WDT_CTRL_500MS 0x02
+#define TS72XX_WDT_CTRL_1SEC 0x03
+#define TS72XX_WDT_CTRL_RESERVED 0x04
+#define TS72XX_WDT_CTRL_2SEC 0x05
+#define TS72XX_WDT_CTRL_4SEC 0x06
+#define TS72XX_WDT_CTRL_8SEC 0x07
+
+/* priv->feed_reg */
+#define TS72XX_WDT_FEED_VAL 0x05
+struct ts72xx_wdt_priv {
void __iomem *control_reg;
void __iomem *feed_reg;
-
- struct platform_device *pdev;
+ struct watchdog_device wdd;
+ unsigned char regval;
};
-static struct platform_device *ts72xx_wdt_pdev;
-
-/*
- * TS-72xx Watchdog supports following timeouts (value written
- * to control register):
- * value description
- * -------------------------
- * 0x00 watchdog disabled
- * 0x01 250ms
- * 0x02 500ms
- * 0x03 1s
- * 0x04 reserved
- * 0x05 2s
- * 0x06 4s
- * 0x07 8s
- *
- * Timeouts below 1s are not very usable so we don't
- * allow them at all.
- *
- * We provide two functions that convert between these:
- * timeout_to_regval() and regval_to_timeout().
- */
-static const struct {
- int timeout;
- int regval;
-} ts72xx_wdt_map[] = {
- { 1, 3 },
- { 2, 5 },
- { 4, 6 },
- { 8, 7 },
-};
-
-/**
- * timeout_to_regval() - converts given timeout to control register value
- * @new_timeout: timeout in seconds to be converted
- *
- * Function converts given @new_timeout into valid value that can
- * be programmed into watchdog control register. When conversion is
- * not possible, function returns %-EINVAL.
- */
-static int timeout_to_regval(int new_timeout)
-{
- int i;
-
- /* first limit it to 1 - 8 seconds */
- new_timeout = clamp_val(new_timeout, 1, 8);
-
- for (i = 0; i < ARRAY_SIZE(ts72xx_wdt_map); i++) {
- if (ts72xx_wdt_map[i].timeout >= new_timeout)
- return ts72xx_wdt_map[i].regval;
- }
-
- return -EINVAL;
-}
-
-/**
- * regval_to_timeout() - converts control register value to timeout
- * @regval: control register value to be converted
- *
- * Function converts given @regval to timeout in seconds (1, 2, 4 or 8).
- * If @regval cannot be converted, function returns %-EINVAL.
- */
-static int regval_to_timeout(int regval)
+static int ts72xx_wdt_start(struct watchdog_device *wdd)
{
- int i;
+ struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
- for (i = 0; i < ARRAY_SIZE(ts72xx_wdt_map); i++) {
- if (ts72xx_wdt_map[i].regval == regval)
- return ts72xx_wdt_map[i].timeout;
- }
+ writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
+ writeb(priv->regval, priv->control_reg);
- return -EINVAL;
+ return 0;
}
-/**
- * ts72xx_wdt_kick() - kick the watchdog
- * @wdt: watchdog to be kicked
- *
- * Called with @wdt->lock held.
- */
-static inline void ts72xx_wdt_kick(struct ts72xx_wdt *wdt)
+static int ts72xx_wdt_stop(struct watchdog_device *wdd)
{
- __raw_writeb(TS72XX_WDT_FEED_VAL, wdt->feed_reg);
-}
+ struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
-/**
- * ts72xx_wdt_start() - starts the watchdog timer
- * @wdt: watchdog to be started
- *
- * This function programs timeout to watchdog timer
- * and starts it.
- *
- * Called with @wdt->lock held.
- */
-static void ts72xx_wdt_start(struct ts72xx_wdt *wdt)
-{
- /*
- * To program the wdt, it first must be "fed" and
- * only after that (within 30 usecs) the configuration
- * can be changed.
- */
- ts72xx_wdt_kick(wdt);
- __raw_writeb((u8)wdt->regval, wdt->control_reg);
-}
+ writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
+ writeb(TS72XX_WDT_CTRL_DISABLE, priv->control_reg);
-/**
- * ts72xx_wdt_stop() - stops the watchdog timer
- * @wdt: watchdog to be stopped
- *
- * Called with @wdt->lock held.
- */
-static void ts72xx_wdt_stop(struct ts72xx_wdt *wdt)
-{
- ts72xx_wdt_kick(wdt);
- __raw_writeb(0, wdt->control_reg);
+ return 0;
}
-static int ts72xx_wdt_open(struct inode *inode, struct file *file)
+static int ts72xx_wdt_ping(struct watchdog_device *wdd)
{
- struct ts72xx_wdt *wdt = platform_get_drvdata(ts72xx_wdt_pdev);
- int regval;
-
- /*
- * Try to convert default timeout to valid register
- * value first.
- */
- regval = timeout_to_regval(timeout);
- if (regval < 0) {
- dev_err(&wdt->pdev->dev,
- "failed to convert timeout (%d) to register value\n",
- timeout);
- return regval;
- }
-
- if (mutex_lock_interruptible(&wdt->lock))
- return -ERESTARTSYS;
+ struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
- if ((wdt->flags & TS72XX_WDT_BUSY_FLAG) != 0) {
- mutex_unlock(&wdt->lock);
- return -EBUSY;
- }
-
- wdt->flags = TS72XX_WDT_BUSY_FLAG;
- wdt->regval = regval;
- file->private_data = wdt;
-
- ts72xx_wdt_start(wdt);
+ writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
- mutex_unlock(&wdt->lock);
- return nonseekable_open(inode, file);
+ return 0;
}
-static int ts72xx_wdt_release(struct inode *inode, struct file *file)
+static int ts72xx_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
{
- struct ts72xx_wdt *wdt = file->private_data;
-
- if (mutex_lock_interruptible(&wdt->lock))
- return -ERESTARTSYS;
-
- if ((wdt->flags & TS72XX_WDT_EXPECT_CLOSE_FLAG) != 0) {
- ts72xx_wdt_stop(wdt);
+ struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+ if (to == 1) {
+ priv->regval = TS72XX_WDT_CTRL_1SEC;
+ } else if (to == 2) {
+ priv->regval = TS72XX_WDT_CTRL_2SEC;
+ } else if (to <= 4) {
+ priv->regval = TS72XX_WDT_CTRL_4SEC;
+ to = 4;
} else {
- dev_warn(&wdt->pdev->dev,
- "TS-72XX WDT device closed unexpectly. "
- "Watchdog timer will not stop!\n");
- /*
- * Kick it one more time, to give userland some time
- * to recover (for example, respawning the kicker
- * daemon).
- */
- ts72xx_wdt_kick(wdt);
+ priv->regval = TS72XX_WDT_CTRL_8SEC;
+ if (to <= 8)
+ to = 8;
}
- wdt->flags = 0;
+ wdd->timeout = to;
- mutex_unlock(&wdt->lock);
- return 0;
-}
-
-static ssize_t ts72xx_wdt_write(struct file *file,
- const char __user *data,
- size_t len,
- loff_t *ppos)
-{
- struct ts72xx_wdt *wdt = file->private_data;
-
- if (!len)
- return 0;
-
- if (mutex_lock_interruptible(&wdt->lock))
- return -ERESTARTSYS;
-
- ts72xx_wdt_kick(wdt);
-
- /*
- * Support for magic character closing. User process
- * writes 'V' into the device, just before it is closed.
- * This means that we know that the wdt timer can be
- * stopped after user closes the device.
- */
- if (!nowayout) {
- int i;
-
- for (i = 0; i < len; i++) {
- char c;
-
- /* In case it was set long ago */
- wdt->flags &= ~TS72XX_WDT_EXPECT_CLOSE_FLAG;
-
- if (get_user(c, data + i)) {
- mutex_unlock(&wdt->lock);
- return -EFAULT;
- }
- if (c == 'V') {
- wdt->flags |= TS72XX_WDT_EXPECT_CLOSE_FLAG;
- break;
- }
- }
+ if (watchdog_active(wdd)) {
+ ts72xx_wdt_stop(wdd);
+ ts72xx_wdt_start(wdd);
}
- mutex_unlock(&wdt->lock);
- return len;
+ return 0;
}
-static const struct watchdog_info winfo = {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
+static const struct watchdog_info ts72xx_wdt_ident = {
+ .options = WDIOF_KEEPALIVEPING |
+ WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "TS-72XX WDT",
};
-static long ts72xx_wdt_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- struct ts72xx_wdt *wdt = file->private_data;
- void __user *argp = (void __user *)arg;
- int __user *p = (int __user *)argp;
- int error = 0;
-
- if (mutex_lock_interruptible(&wdt->lock))
- return -ERESTARTSYS;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- if (copy_to_user(argp, &winfo, sizeof(winfo)))
- error = -EFAULT;
- break;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- error = put_user(0, p);
- break;
-
- case WDIOC_KEEPALIVE:
- ts72xx_wdt_kick(wdt);
- break;
-
- case WDIOC_SETOPTIONS: {
- int options;
-
- error = get_user(options, p);
- if (error)
- break;
-
- error = -EINVAL;
-
- if ((options & WDIOS_DISABLECARD) != 0) {
- ts72xx_wdt_stop(wdt);
- error = 0;
- }
- if ((options & WDIOS_ENABLECARD) != 0) {
- ts72xx_wdt_start(wdt);
- error = 0;
- }
-
- break;
- }
-
- case WDIOC_SETTIMEOUT: {
- int new_timeout;
- int regval;
-
- error = get_user(new_timeout, p);
- if (error)
- break;
-
- regval = timeout_to_regval(new_timeout);
- if (regval < 0) {
- error = regval;
- break;
- }
- ts72xx_wdt_stop(wdt);
- wdt->regval = regval;
- ts72xx_wdt_start(wdt);
-
- /*FALLTHROUGH*/
- }
-
- case WDIOC_GETTIMEOUT:
- error = put_user(regval_to_timeout(wdt->regval), p);
- break;
-
- default:
- error = -ENOTTY;
- break;
- }
-
- mutex_unlock(&wdt->lock);
- return error;
-}
-
-static const struct file_operations ts72xx_wdt_fops = {
+static struct watchdog_ops ts72xx_wdt_ops = {
.owner = THIS_MODULE,
- .llseek = no_llseek,
- .open = ts72xx_wdt_open,
- .release = ts72xx_wdt_release,
- .write = ts72xx_wdt_write,
- .unlocked_ioctl = ts72xx_wdt_ioctl,
-};
-
-static struct miscdevice ts72xx_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &ts72xx_wdt_fops,
+ .start = ts72xx_wdt_start,
+ .stop = ts72xx_wdt_stop,
+ .ping = ts72xx_wdt_ping,
+ .set_timeout = ts72xx_wdt_settimeout,
};
static int ts72xx_wdt_probe(struct platform_device *pdev)
{
- struct ts72xx_wdt *wdt;
- struct resource *r1, *r2;
- int error = 0;
+ struct ts72xx_wdt_priv *priv;
+ struct watchdog_device *wdd;
+ struct resource *res;
+ int ret;
- wdt = devm_kzalloc(&pdev->dev, sizeof(struct ts72xx_wdt), GFP_KERNEL);
- if (!wdt)
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
return -ENOMEM;
- r1 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- wdt->control_reg = devm_ioremap_resource(&pdev->dev, r1);
- if (IS_ERR(wdt->control_reg))
- return PTR_ERR(wdt->control_reg);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->control_reg = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->control_reg))
+ return PTR_ERR(priv->control_reg);
- r2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- wdt->feed_reg = devm_ioremap_resource(&pdev->dev, r2);
- if (IS_ERR(wdt->feed_reg))
- return PTR_ERR(wdt->feed_reg);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ priv->feed_reg = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->feed_reg))
+ return PTR_ERR(priv->feed_reg);
- platform_set_drvdata(pdev, wdt);
- ts72xx_wdt_pdev = pdev;
- wdt->pdev = pdev;
- mutex_init(&wdt->lock);
+ wdd = &priv->wdd;
+ wdd->info = &ts72xx_wdt_ident;
+ wdd->ops = &ts72xx_wdt_ops;
+ wdd->min_timeout = 1;
+ wdd->max_hw_heartbeat_ms = 8000;
+ wdd->parent = &pdev->dev;
- /* make sure that the watchdog is disabled */
- ts72xx_wdt_stop(wdt);
+ watchdog_set_nowayout(wdd, nowayout);
- error = misc_register(&ts72xx_wdt_miscdev);
- if (error) {
- dev_err(&pdev->dev, "failed to register miscdev\n");
- return error;
- }
+ wdd->timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
+ watchdog_init_timeout(wdd, timeout, &pdev->dev);
- dev_info(&pdev->dev, "TS-72xx Watchdog driver\n");
+ watchdog_set_drvdata(wdd, priv);
- return 0;
-}
+ ret = devm_watchdog_register_device(&pdev->dev, wdd);
+ if (ret)
+ return ret;
+
+ dev_info(&pdev->dev, "TS-72xx Watchdog driver\n");
-static int ts72xx_wdt_remove(struct platform_device *pdev)
-{
- misc_deregister(&ts72xx_wdt_miscdev);
return 0;
}
static struct platform_driver ts72xx_wdt_driver = {
.probe = ts72xx_wdt_probe,
- .remove = ts72xx_wdt_remove,
.driver = {
.name = "ts72xx-wdt",
},
projects / platform / kernel / linux-exynos.git / commitdiff