watchdog: it87_wdt: Work around non-working CIR interrupts

On some hardware platforms, the it87_wdt watchdog resets the machine
despite the watchdog daemon running and writing to /dev/watchdog.

This is due to Consumer IR buffer underrun interrupts being used as
triggers to reset the timer.  On some buggy hardware implementations
such as the iEi AFL-12A-N270 single-board computer, this method does
not work.

However, resetting the timer by writing its original timeout value in
its configuration register over and over again suppresses the unwanted
reboots.

Add a module option (nocir), 0 by default in order not to break existing
setups.  Setting it to 1 enables the workaround.

Fixes bug #42801 <https://bugzilla.kernel.org/show_bug.cgi?id=42801>.
Tested primarily on Linux 3.5.7, applies cleanly on Linux 3.13.5.

Signed-off-by: Marc van der Wal <x0r+kernel@x0r.fr>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

2 files changed, 33 insertions, 10 deletions

diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
index b39f35596ba2..692791cc674c 100644
--- a/Documentation/watchdog/watchdog-parameters.txt
+++ b/Documentation/watchdog/watchdog-parameters.txt
@@ -150,6 +150,8 @@ nowayout: Disable watchdog shutdown on close
 -------------------------------------------------
 it87_wdt:
 nogameport: Forbid the activation of game port, default=0
+nocir: Forbid the use of CIR (workaround for some buggy setups); set to 1 if
+system resets despite watchdog daemon running, default=0
 exclusive: Watchdog exclusive device open, default=1
 timeout: Watchdog timeout in seconds, default=60
 testmode: Watchdog test mode (1 = no reboot), default=0
diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c
index e2bba68ae71e..0b93739c0106 100644
--- a/drivers/watchdog/it87_wdt.c
+++ b/drivers/watchdog/it87_wdt.c
@@ -54,6 +54,7 @@
 
 /* Defaults for Module Parameter */
 #define DEFAULT_NOGAMEPORT      0
+#define DEFAULT_NOCIR           0
 #define DEFAULT_EXCLUSIVE       1
 #define DEFAULT_TIMEOUT         60
 #define DEFAULT_TESTMODE        0
@@ -136,11 +137,13 @@
 #define WDTS_LOCKED     3
 #define WDTS_USE_GP     4
 #define WDTS_EXPECTED   5
+#define WDTS_USE_CIR    6
 
 static  unsigned int base, gpact, ciract, max_units, chip_type;
 static  unsigned long wdt_status;
 
 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;
@@ -149,6 +152,9 @@ 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));
@@ -258,9 +264,17 @@ 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);
 }
 
@@ -273,7 +287,7 @@ static int wdt_start(void)
         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);
         wdt_update_timeout();
 
@@ -660,7 +674,7 @@ static int __init it87_wdt_init(void)
         }
 
         /* 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 (gp_rreq_fail)
                                 pr_err("I/O Address 0x%04x and 0x%04x already in use\n",
@@ -682,6 +696,7 @@ static int __init it87_wdt_init(void)
                         superio_select(GAMEPORT);
                         superio_outb(gpact, ACTREG);
                 }
+                set_bit(WDTS_USE_CIR, &wdt_status);
         }
 
         if (timeout < 1 || timeout > max_units * 60) {
@@ -707,7 +722,7 @@ static int __init it87_wdt_init(void)
         }
 
         /* 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));
@@ -717,9 +732,9 @@ static int __init it87_wdt_init(void)
                 outb(0x09, CIR_IER(base));
         }
 
-        pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d exclusive=%d nogameport=%d)\n",
+        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);
+                nowayout, testmode, exclusive, nogameport, nocir);
 
         superio_exit();
         return 0;
@@ -727,8 +742,10 @@ static int __init it87_wdt_init(void)
 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)) {
+        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);
         }
@@ -754,7 +771,7 @@ static void __exit it87_wdt_exit(void)
                 if (test_bit(WDTS_USE_GP, &wdt_status)) {
                         superio_select(GAMEPORT);
                         superio_outb(gpact, ACTREG);
-                } else {
+                } else if (test_bit(WDTS_USE_CIR, &wdt_status)) {
                         superio_select(CIR);
                         superio_outb(ciract, ACTREG);
                 }
@@ -763,7 +780,11 @@ static void __exit it87_wdt_exit(void)
 
         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);