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-rw-r--r--drivers/watchdog/i6300esb.c232
1 files changed, 47 insertions, 185 deletions
diff --git a/drivers/watchdog/i6300esb.c b/drivers/watchdog/i6300esb.c
index d7befd58b391..4f4287d83c21 100644
--- a/drivers/watchdog/i6300esb.c
+++ b/drivers/watchdog/i6300esb.c
@@ -21,6 +21,8 @@
* Version 0.02
* 20050210 David Härdeman <david@2gen.com>
* Ported driver to kernel 2.6
+ * 20171016 Radu Rendec <rrendec@arista.com>
+ * Change driver to use the watchdog subsystem
*/
/*
@@ -44,7 +46,6 @@
/* Module and version information */
#define ESB_VERSION "0.05"
#define ESB_MODULE_NAME "i6300ESB timer"
-#define ESB_DRIVER_NAME ESB_MODULE_NAME ", v" ESB_VERSION
/* PCI configuration registers */
#define ESB_CONFIG_REG 0x60 /* Config register */
@@ -76,11 +77,7 @@
/* internal variables */
static void __iomem *BASEADDR;
-static DEFINE_SPINLOCK(esb_lock); /* Guards the hardware */
-static unsigned long timer_alive;
static struct pci_dev *esb_pci;
-static unsigned short triggered; /* The status of the watchdog upon boot */
-static char esb_expect_close;
/* We can only use 1 card due to the /dev/watchdog restriction */
static int cards_found;
@@ -88,7 +85,7 @@ static int cards_found;
/* module parameters */
/* 30 sec default heartbeat (1 < heartbeat < 2*1023) */
#define WATCHDOG_HEARTBEAT 30
-static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
+static int heartbeat; /* in seconds */
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat,
"Watchdog heartbeat in seconds. (1<heartbeat<2046, default="
@@ -116,55 +113,47 @@ static inline void esb_unlock_registers(void)
writew(ESB_UNLOCK2, ESB_RELOAD_REG);
}
-static int esb_timer_start(void)
+static int esb_timer_start(struct watchdog_device *wdd)
{
+ int _wdd_nowayout = test_bit(WDOG_NO_WAY_OUT, &wdd->status);
u8 val;
- spin_lock(&esb_lock);
esb_unlock_registers();
writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
/* Enable or Enable + Lock? */
- val = ESB_WDT_ENABLE | (nowayout ? ESB_WDT_LOCK : 0x00);
+ val = ESB_WDT_ENABLE | (_wdd_nowayout ? ESB_WDT_LOCK : 0x00);
pci_write_config_byte(esb_pci, ESB_LOCK_REG, val);
- spin_unlock(&esb_lock);
return 0;
}
-static int esb_timer_stop(void)
+static int esb_timer_stop(struct watchdog_device *wdd)
{
u8 val;
- spin_lock(&esb_lock);
/* First, reset timers as suggested by the docs */
esb_unlock_registers();
writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
/* Then disable the WDT */
pci_write_config_byte(esb_pci, ESB_LOCK_REG, 0x0);
pci_read_config_byte(esb_pci, ESB_LOCK_REG, &val);
- spin_unlock(&esb_lock);
/* Returns 0 if the timer was disabled, non-zero otherwise */
return val & ESB_WDT_ENABLE;
}
-static void esb_timer_keepalive(void)
+static int esb_timer_keepalive(struct watchdog_device *wdd)
{
- spin_lock(&esb_lock);
esb_unlock_registers();
writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
/* FIXME: Do we need to flush anything here? */
- spin_unlock(&esb_lock);
+ return 0;
}
-static int esb_timer_set_heartbeat(int time)
+static int esb_timer_set_heartbeat(struct watchdog_device *wdd,
+ unsigned int time)
{
u32 val;
- if (time < 0x1 || time > (2 * 0x03ff))
- return -EINVAL;
-
- spin_lock(&esb_lock);
-
/* We shift by 9, so if we are passed a value of 1 sec,
* val will be 1 << 9 = 512, then write that to two
* timers => 2 * 512 = 1024 (which is decremented at 1KHz)
@@ -186,148 +175,33 @@ static int esb_timer_set_heartbeat(int time)
/* FIXME: Do we need to flush everything out? */
/* Done */
- heartbeat = time;
- spin_unlock(&esb_lock);
+ wdd->timeout = time;
return 0;
}
/*
- * /dev/watchdog handling
+ * Watchdog Subsystem Interfaces
*/
-static int esb_open(struct inode *inode, struct file *file)
-{
- /* /dev/watchdog can only be opened once */
- if (test_and_set_bit(0, &timer_alive))
- return -EBUSY;
-
- /* Reload and activate timer */
- esb_timer_start();
-
- return nonseekable_open(inode, file);
-}
-
-static int esb_release(struct inode *inode, struct file *file)
-{
- /* Shut off the timer. */
- if (esb_expect_close == 42)
- esb_timer_stop();
- else {
- pr_crit("Unexpected close, not stopping watchdog!\n");
- esb_timer_keepalive();
- }
- clear_bit(0, &timer_alive);
- esb_expect_close = 0;
- return 0;
-}
-
-static ssize_t esb_write(struct file *file, const char __user *data,
- size_t len, loff_t *ppos)
-{
- /* See if we got the magic character 'V' and reload the timer */
- if (len) {
- if (!nowayout) {
- size_t i;
-
- /* note: just in case someone wrote the magic character
- * five months ago... */
- esb_expect_close = 0;
-
- /* scan to see whether or not we got the
- * magic character */
- for (i = 0; i != len; i++) {
- char c;
- if (get_user(c, data + i))
- return -EFAULT;
- if (c == 'V')
- esb_expect_close = 42;
- }
- }
-
- /* someone wrote to us, we should reload the timer */
- esb_timer_keepalive();
- }
- return len;
-}
-
-static long esb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- int new_options, retval = -EINVAL;
- int new_heartbeat;
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- static const struct watchdog_info ident = {
- .options = WDIOF_SETTIMEOUT |
- WDIOF_KEEPALIVEPING |
- WDIOF_MAGICCLOSE,
- .firmware_version = 0,
- .identity = ESB_MODULE_NAME,
- };
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident,
- sizeof(ident)) ? -EFAULT : 0;
-
- case WDIOC_GETSTATUS:
- return put_user(0, p);
-
- case WDIOC_GETBOOTSTATUS:
- return put_user(triggered, p);
-
- case WDIOC_SETOPTIONS:
- {
- if (get_user(new_options, p))
- return -EFAULT;
-
- if (new_options & WDIOS_DISABLECARD) {
- esb_timer_stop();
- retval = 0;
- }
-
- if (new_options & WDIOS_ENABLECARD) {
- esb_timer_start();
- retval = 0;
- }
- return retval;
- }
- case WDIOC_KEEPALIVE:
- esb_timer_keepalive();
- return 0;
-
- case WDIOC_SETTIMEOUT:
- {
- if (get_user(new_heartbeat, p))
- return -EFAULT;
- if (esb_timer_set_heartbeat(new_heartbeat))
- return -EINVAL;
- esb_timer_keepalive();
- /* Fall */
- }
- case WDIOC_GETTIMEOUT:
- return put_user(heartbeat, p);
- default:
- return -ENOTTY;
- }
-}
-
-/*
- * Kernel Interfaces
- */
+static struct watchdog_info esb_info = {
+ .identity = ESB_MODULE_NAME,
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+};
-static const struct file_operations esb_fops = {
+static const struct watchdog_ops esb_ops = {
.owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = esb_write,
- .unlocked_ioctl = esb_ioctl,
- .open = esb_open,
- .release = esb_release,
+ .start = esb_timer_start,
+ .stop = esb_timer_stop,
+ .set_timeout = esb_timer_set_heartbeat,
+ .ping = esb_timer_keepalive,
};
-static struct miscdevice esb_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &esb_fops,
+static struct watchdog_device esb_dev = {
+ .info = &esb_info,
+ .ops = &esb_ops,
+ .min_timeout = 1,
+ .max_timeout = 2 * 0x03ff,
+ .timeout = WATCHDOG_HEARTBEAT,
};
/*
@@ -346,19 +220,19 @@ MODULE_DEVICE_TABLE(pci, esb_pci_tbl);
static unsigned char esb_getdevice(struct pci_dev *pdev)
{
if (pci_enable_device(pdev)) {
- pr_err("failed to enable device\n");
+ dev_err(&pdev->dev, "failed to enable device\n");
goto err_devput;
}
if (pci_request_region(pdev, 0, ESB_MODULE_NAME)) {
- pr_err("failed to request region\n");
+ dev_err(&pdev->dev, "failed to request region\n");
goto err_disable;
}
BASEADDR = pci_ioremap_bar(pdev, 0);
if (BASEADDR == NULL) {
/* Something's wrong here, BASEADDR has to be set */
- pr_err("failed to get BASEADDR\n");
+ dev_err(&pdev->dev, "failed to get BASEADDR\n");
goto err_release;
}
@@ -396,7 +270,7 @@ static void esb_initdevice(void)
/* Check that the WDT isn't already locked */
pci_read_config_byte(esb_pci, ESB_LOCK_REG, &val1);
if (val1 & ESB_WDT_LOCK)
- pr_warn("nowayout already set\n");
+ dev_warn(&esb_pci->dev, "nowayout already set\n");
/* Set the timer to watchdog mode and disable it for now */
pci_write_config_byte(esb_pci, ESB_LOCK_REG, 0x00);
@@ -405,14 +279,14 @@ static void esb_initdevice(void)
esb_unlock_registers();
val2 = readw(ESB_RELOAD_REG);
if (val2 & ESB_WDT_TIMEOUT)
- triggered = WDIOF_CARDRESET;
+ esb_dev.bootstatus = WDIOF_CARDRESET;
/* Reset WDT_TIMEOUT flag and timers */
esb_unlock_registers();
writew((ESB_WDT_TIMEOUT | ESB_WDT_RELOAD), ESB_RELOAD_REG);
/* And set the correct timeout value */
- esb_timer_set_heartbeat(heartbeat);
+ esb_timer_set_heartbeat(&esb_dev, esb_dev.timeout);
}
static int esb_probe(struct pci_dev *pdev,
@@ -434,26 +308,25 @@ static int esb_probe(struct pci_dev *pdev,
if (!esb_getdevice(pdev) || esb_pci == NULL)
return -ENODEV;
- /* Check that the heartbeat value is within it's range;
- if not reset to the default */
- if (heartbeat < 0x1 || heartbeat > 2 * 0x03ff) {
- heartbeat = WATCHDOG_HEARTBEAT;
- pr_info("heartbeat value must be 1<heartbeat<2046, using %d\n",
- heartbeat);
- }
-
/* Initialize the watchdog and make sure it does not run */
+ if (watchdog_init_timeout(&esb_dev, heartbeat, NULL))
+ pr_info("heartbeat value must be 1<heartbeat<2046, using %u\n",
+ esb_dev.timeout);
+ watchdog_set_nowayout(&esb_dev, nowayout);
+ watchdog_stop_on_reboot(&esb_dev);
+ watchdog_stop_on_unregister(&esb_dev);
esb_initdevice();
/* Register the watchdog so that userspace has access to it */
- ret = misc_register(&esb_miscdev);
+ ret = watchdog_register_device(&esb_dev);
if (ret != 0) {
- pr_err("cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
+ dev_err(&pdev->dev,
+ "cannot register watchdog device (err=%d)\n", ret);
goto err_unmap;
}
- pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
- BASEADDR, heartbeat, nowayout);
+ dev_info(&pdev->dev,
+ "initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
+ BASEADDR, esb_dev.timeout, nowayout);
return 0;
err_unmap:
@@ -466,29 +339,18 @@ err_unmap:
static void esb_remove(struct pci_dev *pdev)
{
- /* Stop the timer before we leave */
- if (!nowayout)
- esb_timer_stop();
-
- /* Deregister */
- misc_deregister(&esb_miscdev);
+ watchdog_unregister_device(&esb_dev);
iounmap(BASEADDR);
pci_release_region(esb_pci, 0);
pci_disable_device(esb_pci);
esb_pci = NULL;
}
-static void esb_shutdown(struct pci_dev *pdev)
-{
- esb_timer_stop();
-}
-
static struct pci_driver esb_driver = {
.name = ESB_MODULE_NAME,
.id_table = esb_pci_tbl,
.probe = esb_probe,
.remove = esb_remove,
- .shutdown = esb_shutdown,
};
module_pci_driver(esb_driver);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.