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path: root/drivers/watchdog/it87_wdt.c
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Diffstat (limited to 'drivers/watchdog/it87_wdt.c')
-rw-r--r--drivers/watchdog/it87_wdt.c364
1 files changed, 217 insertions, 147 deletions
diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c
index cc133c531d0..0b93739c010 100644
--- a/drivers/watchdog/it87_wdt.c
+++ b/drivers/watchdog/it87_wdt.c
@@ -12,7 +12,8 @@
* http://www.ite.com.tw/
*
* Support of the watchdog timers, which are available on
- * IT8716, IT8718, IT8726 and IT8712 (J,K version).
+ * IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726
+ * and IT8728.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -29,6 +30,8 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
@@ -43,18 +46,17 @@
#include <linux/uaccess.h>
#include <linux/io.h>
-#include <asm/system.h>
-#define WATCHDOG_VERSION "1.12"
+#define WATCHDOG_VERSION "1.14"
#define WATCHDOG_NAME "IT87 WDT"
-#define PFX WATCHDOG_NAME ": "
#define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n"
#define WD_MAGIC 'V'
/* Defaults for Module Parameter */
#define DEFAULT_NOGAMEPORT 0
+#define DEFAULT_NOCIR 0
#define DEFAULT_EXCLUSIVE 1
-#define DEFAULT_TIMEOUT 60
+#define DEFAULT_TIMEOUT 60
#define DEFAULT_TESTMODE 0
#define DEFAULT_NOWAYOUT WATCHDOG_NOWAYOUT
@@ -70,20 +72,24 @@
/* Configuration Registers and Functions */
#define LDNREG 0x07
#define CHIPID 0x20
-#define CHIPREV 0x22
+#define CHIPREV 0x22
#define ACTREG 0x30
-#define BASEREG 0x60
+#define BASEREG 0x60
/* Chip Id numbers */
#define NO_DEV_ID 0xffff
+#define IT8702_ID 0x8702
#define IT8705_ID 0x8705
#define IT8712_ID 0x8712
#define IT8716_ID 0x8716
#define IT8718_ID 0x8718
+#define IT8720_ID 0x8720
+#define IT8721_ID 0x8721
#define IT8726_ID 0x8726 /* the data sheet suggest wrongly 0x8716 */
+#define IT8728_ID 0x8728
/* GPIO Configuration Registers LDN=0x07 */
-#define WDTCTRL 0x71
+#define WDTCTRL 0x71
#define WDTCFG 0x72
#define WDTVALLSB 0x73
#define WDTVALMSB 0x74
@@ -92,7 +98,7 @@
#define WDT_CIRINT 0x80
#define WDT_MOUSEINT 0x40
#define WDT_KYBINT 0x20
-#define WDT_GAMEPORT 0x10 /* not it8718 */
+#define WDT_GAMEPORT 0x10 /* not in it8718, it8720, it8721, it8728 */
#define WDT_FORCE 0x02
#define WDT_ZERO 0x01
@@ -100,11 +106,11 @@
#define WDT_TOV1 0x80
#define WDT_KRST 0x40
#define WDT_TOVE 0x20
-#define WDT_PWROK 0x10
+#define WDT_PWROK 0x10 /* not in it8721 */
#define WDT_INT_MASK 0x0f
/* CIR Configuration Register LDN=0x0a */
-#define CIR_ILS 0x70
+#define CIR_ILS 0x70
/* The default Base address is not always available, we use this */
#define CIR_BASE 0x0208
@@ -131,20 +137,24 @@
#define WDTS_LOCKED 3
#define WDTS_USE_GP 4
#define WDTS_EXPECTED 5
+#define WDTS_USE_CIR 6
-static unsigned int base, gpact, ciract;
+static unsigned int base, gpact, ciract, max_units, chip_type;
static unsigned long wdt_status;
-static DEFINE_SPINLOCK(spinlock);
static int nogameport = DEFAULT_NOGAMEPORT;
+static int nocir = DEFAULT_NOCIR;
static int exclusive = DEFAULT_EXCLUSIVE;
static int timeout = DEFAULT_TIMEOUT;
static int testmode = DEFAULT_TESTMODE;
-static int nowayout = DEFAULT_NOWAYOUT;
+static bool nowayout = DEFAULT_NOWAYOUT;
module_param(nogameport, int, 0);
MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default="
__MODULE_STRING(DEFAULT_NOGAMEPORT));
+module_param(nocir, int, 0);
+MODULE_PARM_DESC(nocir, "Forbid the use of Consumer IR interrupts to reset timer, default="
+ __MODULE_STRING(DEFAULT_NOCIR));
module_param(exclusive, int, 0);
MODULE_PARM_DESC(exclusive, "Watchdog exclusive device open, default="
__MODULE_STRING(DEFAULT_EXCLUSIVE));
@@ -154,24 +164,32 @@ MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, default="
module_param(testmode, int, 0);
MODULE_PARM_DESC(testmode, "Watchdog test mode (1 = no reboot), default="
__MODULE_STRING(DEFAULT_TESTMODE));
-module_param(nowayout, int, 0);
+module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started, default="
__MODULE_STRING(WATCHDOG_NOWAYOUT));
/* Superio Chip */
-static inline void superio_enter(void)
+static inline int superio_enter(void)
{
+ /*
+ * Try to reserve REG and REG + 1 for exclusive access.
+ */
+ if (!request_muxed_region(REG, 2, WATCHDOG_NAME))
+ return -EBUSY;
+
outb(0x87, REG);
outb(0x01, REG);
outb(0x55, REG);
outb(0x55, REG);
+ return 0;
}
static inline void superio_exit(void)
{
outb(0x02, REG);
outb(0x02, VAL);
+ release_region(REG, 2);
}
static inline void superio_select(int ldn)
@@ -210,88 +228,120 @@ static inline void superio_outw(int val, int reg)
outb(val, VAL);
}
+/* Internal function, should be called after superio_select(GPIO) */
+static void wdt_update_timeout(void)
+{
+ unsigned char cfg = WDT_KRST;
+ int tm = timeout;
+
+ if (testmode)
+ cfg = 0;
+
+ if (tm <= max_units)
+ cfg |= WDT_TOV1;
+ else
+ tm /= 60;
+
+ if (chip_type != IT8721_ID)
+ cfg |= WDT_PWROK;
+
+ superio_outb(cfg, WDTCFG);
+ superio_outb(tm, WDTVALLSB);
+ if (max_units > 255)
+ superio_outb(tm>>8, WDTVALMSB);
+}
+
+static int wdt_round_time(int t)
+{
+ t += 59;
+ t -= t % 60;
+ return t;
+}
+
/* watchdog timer handling */
static void wdt_keepalive(void)
{
if (test_bit(WDTS_USE_GP, &wdt_status))
inb(base);
- else
+ else if (test_bit(WDTS_USE_CIR, &wdt_status))
/* The timer reloads with around 5 msec delay */
outb(0x55, CIR_DR(base));
+ else {
+ if (superio_enter())
+ return;
+
+ superio_select(GPIO);
+ wdt_update_timeout();
+ superio_exit();
+ }
set_bit(WDTS_KEEPALIVE, &wdt_status);
}
-static void wdt_start(void)
+static int wdt_start(void)
{
- unsigned long flags;
-
- spin_lock_irqsave(&spinlock, flags);
- superio_enter();
+ int ret = superio_enter();
+ if (ret)
+ return ret;
superio_select(GPIO);
if (test_bit(WDTS_USE_GP, &wdt_status))
superio_outb(WDT_GAMEPORT, WDTCTRL);
- else
+ else if (test_bit(WDTS_USE_CIR, &wdt_status))
superio_outb(WDT_CIRINT, WDTCTRL);
- if (!testmode)
- superio_outb(WDT_TOV1 | WDT_KRST | WDT_PWROK, WDTCFG);
- else
- superio_outb(WDT_TOV1, WDTCFG);
- superio_outb(timeout>>8, WDTVALMSB);
- superio_outb(timeout, WDTVALLSB);
+ wdt_update_timeout();
superio_exit();
- spin_unlock_irqrestore(&spinlock, flags);
+
+ return 0;
}
-static void wdt_stop(void)
+static int wdt_stop(void)
{
- unsigned long flags;
-
- spin_lock_irqsave(&spinlock, flags);
- superio_enter();
+ int ret = superio_enter();
+ if (ret)
+ return ret;
superio_select(GPIO);
superio_outb(0x00, WDTCTRL);
superio_outb(WDT_TOV1, WDTCFG);
- superio_outb(0x00, WDTVALMSB);
superio_outb(0x00, WDTVALLSB);
+ if (max_units > 255)
+ superio_outb(0x00, WDTVALMSB);
superio_exit();
- spin_unlock_irqrestore(&spinlock, flags);
+ return 0;
}
/**
* wdt_set_timeout - set a new timeout value with watchdog ioctl
* @t: timeout value in seconds
*
- * The hardware device has a 16 bit watchdog timer, thus the
- * timeout time ranges between 1 and 65535 seconds.
+ * The hardware device has a 8 or 16 bit watchdog timer (depends on
+ * chip version) that can be configured to count seconds or minutes.
*
* Used within WDIOC_SETTIMEOUT watchdog device ioctl.
*/
static int wdt_set_timeout(int t)
{
- unsigned long flags;
-
- if (t < 1 || t > 65535)
+ if (t < 1 || t > max_units * 60)
return -EINVAL;
- timeout = t;
+ if (t > max_units)
+ timeout = wdt_round_time(t);
+ else
+ timeout = t;
- spin_lock_irqsave(&spinlock, flags);
if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
- superio_enter();
+ int ret = superio_enter();
+ if (ret)
+ return ret;
superio_select(GPIO);
- superio_outb(t>>8, WDTVALMSB);
- superio_outb(t, WDTVALLSB);
-
+ wdt_update_timeout();
superio_exit();
}
- spin_unlock_irqrestore(&spinlock, flags);
return 0;
}
@@ -310,12 +360,12 @@ static int wdt_set_timeout(int t)
static int wdt_get_status(int *status)
{
- unsigned long flags;
-
*status = 0;
if (testmode) {
- spin_lock_irqsave(&spinlock, flags);
- superio_enter();
+ int ret = superio_enter();
+ if (ret)
+ return ret;
+
superio_select(GPIO);
if (superio_inb(WDTCTRL) & WDT_ZERO) {
superio_outb(0x00, WDTCTRL);
@@ -324,7 +374,6 @@ static int wdt_get_status(int *status)
}
superio_exit();
- spin_unlock_irqrestore(&spinlock, flags);
}
if (test_and_clear_bit(WDTS_KEEPALIVE, &wdt_status))
*status |= WDIOF_KEEPALIVEPING;
@@ -350,9 +399,17 @@ static int wdt_open(struct inode *inode, struct file *file)
if (exclusive && test_and_set_bit(WDTS_DEV_OPEN, &wdt_status))
return -EBUSY;
if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) {
+ int ret;
if (nowayout && !test_and_set_bit(WDTS_LOCKED, &wdt_status))
__module_get(THIS_MODULE);
- wdt_start();
+
+ ret = wdt_start();
+ if (ret) {
+ clear_bit(WDTS_LOCKED, &wdt_status);
+ clear_bit(WDTS_TIMER_RUN, &wdt_status);
+ clear_bit(WDTS_DEV_OPEN, &wdt_status);
+ return ret;
+ }
}
return nonseekable_open(inode, file);
}
@@ -374,12 +431,20 @@ static int wdt_release(struct inode *inode, struct file *file)
{
if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
if (test_and_clear_bit(WDTS_EXPECTED, &wdt_status)) {
- wdt_stop();
+ int ret = wdt_stop();
+ if (ret) {
+ /*
+ * Stop failed. Just keep the watchdog alive
+ * and hope nothing bad happens.
+ */
+ set_bit(WDTS_EXPECTED, &wdt_status);
+ wdt_keepalive();
+ return ret;
+ }
clear_bit(WDTS_TIMER_RUN, &wdt_status);
} else {
wdt_keepalive();
- printk(KERN_CRIT PFX
- "unexpected close, not stopping watchdog!\n");
+ pr_crit("unexpected close, not stopping watchdog!\n");
}
}
clear_bit(WDTS_DEV_OPEN, &wdt_status);
@@ -421,7 +486,7 @@ static ssize_t wdt_write(struct file *file, const char __user *buf,
return count;
}
-static struct watchdog_info ident = {
+static const struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
.firmware_version = 1,
.identity = WATCHDOG_NAME,
@@ -455,7 +520,9 @@ static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
&ident, sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
- wdt_get_status(&status);
+ rc = wdt_get_status(&status);
+ if (rc)
+ return rc;
return put_user(status, uarg.i);
case WDIOC_GETBOOTSTATUS:
@@ -471,14 +538,22 @@ static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
switch (new_options) {
case WDIOS_DISABLECARD:
- if (test_bit(WDTS_TIMER_RUN, &wdt_status))
- wdt_stop();
+ if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
+ rc = wdt_stop();
+ if (rc)
+ return rc;
+ }
clear_bit(WDTS_TIMER_RUN, &wdt_status);
return 0;
case WDIOS_ENABLECARD:
- if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status))
- wdt_start();
+ if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) {
+ rc = wdt_start();
+ if (rc) {
+ clear_bit(WDTS_TIMER_RUN, &wdt_status);
+ return rc;
+ }
+ }
return 0;
default:
@@ -529,49 +604,61 @@ static struct notifier_block wdt_notifier = {
static int __init it87_wdt_init(void)
{
int rc = 0;
- u16 chip_type;
+ int try_gameport = !nogameport;
u8 chip_rev;
- unsigned long flags;
+ int gp_rreq_fail = 0;
+
+ wdt_status = 0;
+
+ rc = superio_enter();
+ if (rc)
+ return rc;
- spin_lock_irqsave(&spinlock, flags);
- superio_enter();
chip_type = superio_inw(CHIPID);
chip_rev = superio_inb(CHIPREV) & 0x0f;
superio_exit();
- spin_unlock_irqrestore(&spinlock, flags);
switch (chip_type) {
+ case IT8702_ID:
+ max_units = 255;
+ break;
+ case IT8712_ID:
+ max_units = (chip_rev < 8) ? 255 : 65535;
+ break;
case IT8716_ID:
- case IT8718_ID:
case IT8726_ID:
+ max_units = 65535;
+ break;
+ case IT8718_ID:
+ case IT8720_ID:
+ case IT8721_ID:
+ case IT8728_ID:
+ max_units = 65535;
+ try_gameport = 0;
break;
- case IT8712_ID:
- if (chip_rev > 7)
- break;
case IT8705_ID:
- printk(KERN_ERR PFX
- "Unsupported Chip found, Chip %04x Revision %02x\n",
+ pr_err("Unsupported Chip found, Chip %04x Revision %02x\n",
chip_type, chip_rev);
return -ENODEV;
case NO_DEV_ID:
- printk(KERN_ERR PFX "no device\n");
+ pr_err("no device\n");
return -ENODEV;
default:
- printk(KERN_ERR PFX
- "Unknown Chip found, Chip %04x Revision %04x\n",
+ pr_err("Unknown Chip found, Chip %04x Revision %04x\n",
chip_type, chip_rev);
return -ENODEV;
}
- spin_lock_irqsave(&spinlock, flags);
- superio_enter();
+ rc = superio_enter();
+ if (rc)
+ return rc;
superio_select(GPIO);
superio_outb(WDT_TOV1, WDTCFG);
superio_outb(0x00, WDTCTRL);
/* First try to get Gameport support */
- if (chip_type != IT8718_ID && !nogameport) {
+ if (try_gameport) {
superio_select(GAMEPORT);
base = superio_inw(BASEREG);
if (!base) {
@@ -580,73 +667,62 @@ static int __init it87_wdt_init(void)
}
gpact = superio_inb(ACTREG);
superio_outb(0x01, ACTREG);
- superio_exit();
- spin_unlock_irqrestore(&spinlock, flags);
if (request_region(base, 1, WATCHDOG_NAME))
set_bit(WDTS_USE_GP, &wdt_status);
else
- rc = -EIO;
- } else {
- superio_exit();
- spin_unlock_irqrestore(&spinlock, flags);
+ gp_rreq_fail = 1;
}
/* If we haven't Gameport support, try to get CIR support */
- if (!test_bit(WDTS_USE_GP, &wdt_status)) {
+ if (!nocir && !test_bit(WDTS_USE_GP, &wdt_status)) {
if (!request_region(CIR_BASE, 8, WATCHDOG_NAME)) {
- if (rc == -EIO)
- printk(KERN_ERR PFX
- "I/O Address 0x%04x and 0x%04x"
- " already in use\n", base, CIR_BASE);
+ if (gp_rreq_fail)
+ pr_err("I/O Address 0x%04x and 0x%04x already in use\n",
+ base, CIR_BASE);
else
- printk(KERN_ERR PFX
- "I/O Address 0x%04x already in use\n",
- CIR_BASE);
+ pr_err("I/O Address 0x%04x already in use\n",
+ CIR_BASE);
rc = -EIO;
goto err_out;
}
base = CIR_BASE;
- spin_lock_irqsave(&spinlock, flags);
- superio_enter();
superio_select(CIR);
superio_outw(base, BASEREG);
superio_outb(0x00, CIR_ILS);
ciract = superio_inb(ACTREG);
superio_outb(0x01, ACTREG);
- if (rc == -EIO) {
+ if (gp_rreq_fail) {
superio_select(GAMEPORT);
superio_outb(gpact, ACTREG);
}
-
- superio_exit();
- spin_unlock_irqrestore(&spinlock, flags);
+ set_bit(WDTS_USE_CIR, &wdt_status);
}
- if (timeout < 1 || timeout > 65535) {
+ if (timeout < 1 || timeout > max_units * 60) {
timeout = DEFAULT_TIMEOUT;
- printk(KERN_WARNING PFX
- "Timeout value out of range, use default %d sec\n",
- DEFAULT_TIMEOUT);
+ pr_warn("Timeout value out of range, use default %d sec\n",
+ DEFAULT_TIMEOUT);
}
+ if (timeout > max_units)
+ timeout = wdt_round_time(timeout);
+
rc = register_reboot_notifier(&wdt_notifier);
if (rc) {
- printk(KERN_ERR PFX
- "Cannot register reboot notifier (err=%d)\n", rc);
+ pr_err("Cannot register reboot notifier (err=%d)\n", rc);
goto err_out_region;
}
rc = misc_register(&wdt_miscdev);
if (rc) {
- printk(KERN_ERR PFX
- "Cannot register miscdev on minor=%d (err=%d)\n",
- wdt_miscdev.minor, rc);
+ pr_err("Cannot register miscdev on minor=%d (err=%d)\n",
+ wdt_miscdev.minor, rc);
goto err_out_reboot;
}
/* Initialize CIR to use it as keepalive source */
- if (!test_bit(WDTS_USE_GP, &wdt_status)) {
+ if (test_bit(WDTS_USE_CIR, &wdt_status)) {
outb(0x00, CIR_RCR(base));
outb(0xc0, CIR_TCR1(base));
outb(0x5c, CIR_TCR2(base));
@@ -656,64 +732,59 @@ static int __init it87_wdt_init(void)
outb(0x09, CIR_IER(base));
}
- printk(KERN_INFO PFX "Chip it%04x revision %d initialized. "
- "timeout=%d sec (nowayout=%d testmode=%d exclusive=%d "
- "nogameport=%d)\n", chip_type, chip_rev, timeout,
- nowayout, testmode, exclusive, nogameport);
+ pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d exclusive=%d nogameport=%d nocir=%d)\n",
+ chip_type, chip_rev, timeout,
+ nowayout, testmode, exclusive, nogameport, nocir);
+ superio_exit();
return 0;
err_out_reboot:
unregister_reboot_notifier(&wdt_notifier);
err_out_region:
- release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8);
- if (!test_bit(WDTS_USE_GP, &wdt_status)) {
- spin_lock_irqsave(&spinlock, flags);
- superio_enter();
+ if (test_bit(WDTS_USE_GP, &wdt_status))
+ release_region(base, 1);
+ else if (test_bit(WDTS_USE_CIR, &wdt_status)) {
+ release_region(base, 8);
superio_select(CIR);
superio_outb(ciract, ACTREG);
- superio_exit();
- spin_unlock_irqrestore(&spinlock, flags);
}
err_out:
- if (chip_type != IT8718_ID && !nogameport) {
- spin_lock_irqsave(&spinlock, flags);
- superio_enter();
+ if (try_gameport) {
superio_select(GAMEPORT);
superio_outb(gpact, ACTREG);
- superio_exit();
- spin_unlock_irqrestore(&spinlock, flags);
}
+ superio_exit();
return rc;
}
static void __exit it87_wdt_exit(void)
{
- unsigned long flags;
- int nolock;
-
- nolock = !spin_trylock_irqsave(&spinlock, flags);
- superio_enter();
- superio_select(GPIO);
- superio_outb(0x00, WDTCTRL);
- superio_outb(0x00, WDTCFG);
- superio_outb(0x00, WDTVALMSB);
- superio_outb(0x00, WDTVALLSB);
- if (test_bit(WDTS_USE_GP, &wdt_status)) {
- superio_select(GAMEPORT);
- superio_outb(gpact, ACTREG);
- } else {
- superio_select(CIR);
- superio_outb(ciract, ACTREG);
+ if (superio_enter() == 0) {
+ superio_select(GPIO);
+ superio_outb(0x00, WDTCTRL);
+ superio_outb(0x00, WDTCFG);
+ superio_outb(0x00, WDTVALLSB);
+ if (max_units > 255)
+ superio_outb(0x00, WDTVALMSB);
+ if (test_bit(WDTS_USE_GP, &wdt_status)) {
+ superio_select(GAMEPORT);
+ superio_outb(gpact, ACTREG);
+ } else if (test_bit(WDTS_USE_CIR, &wdt_status)) {
+ superio_select(CIR);
+ superio_outb(ciract, ACTREG);
+ }
+ superio_exit();
}
- superio_exit();
- if (!nolock)
- spin_unlock_irqrestore(&spinlock, flags);
misc_deregister(&wdt_miscdev);
unregister_reboot_notifier(&wdt_notifier);
- release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8);
+
+ if (test_bit(WDTS_USE_GP, &wdt_status))
+ release_region(base, 1);
+ else if (test_bit(WDTS_USE_CIR, &wdt_status))
+ release_region(base, 8);
}
module_init(it87_wdt_init);
@@ -722,4 +793,3 @@ module_exit(it87_wdt_exit);
MODULE_AUTHOR("Oliver Schuster");
MODULE_DESCRIPTION("Hardware Watchdog Device Driver for IT87xx EC-LPC I/O");
MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 22:16:01 +0000