[WATCHDOG] SA1100 watchdog maximum timeout

This patch replaces the hardcoded 255 seconds limit for a real limit based on 
oscr_freq. 

Also, the 'firmware_version' field is changed to '1' to allow the user 
space application to easily detect that this driver supports a higher 
maximum timeout.

Signed-off-by: Raphael Assenat <raph@8D.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/watchdog/sa1100_wdt.c b/drivers/watchdog/sa1100_wdt.c
index ee1caae4d33b..016245419fad 100644
--- a/drivers/watchdog/sa1100_wdt.c
+++ b/drivers/watchdog/sa1100_wdt.c
@@ -38,7 +38,7 @@
 
 static unsigned long oscr_freq;
 static unsigned long sa1100wdt_users;
-static int pre_margin;
+static unsigned int pre_margin;
 static int boot_status;
 
 /*
@@ -84,6 +84,7 @@ static const struct watchdog_info ident = {
         .options        = WDIOF_CARDRESET | WDIOF_SETTIMEOUT
                                 | WDIOF_KEEPALIVEPING,
         .identity       = "SA1100/PXA255 Watchdog",
+        .firmware_version       = 1,
 };
 
 static long sa1100dog_ioctl(struct file *file, unsigned int cmd,
@@ -118,7 +119,7 @@ static long sa1100dog_ioctl(struct file *file, unsigned int cmd,
                 if (ret)
                         break;
 
-                if (time <= 0 || time > 255) {
+                if (time <= 0 || (oscr_freq * (long long)time >= 0xffffffff)) {
                         ret = -EINVAL;
                         break;
                 }