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authorAlexandros C. Couloumbis <alex@ozo.com>2010-10-12 15:59:35 +0000
committerAlexandros C. Couloumbis <alex@ozo.com>2010-10-12 15:59:35 +0000
commit6485e6534db8489325a1a7848f675b0f51f40d34 (patch)
treeb96f9ef7e69fe658339c1d3816fcf29ed74676b8 /target/linux/generic/patches-2.6.36
parent5fe6b2b4825fa9e90ba201e5f0adad63141aaad8 (diff)
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target/linux: Add support for cores with slow WDT clock like bcm5354. (thank you Aleksandar Radovanovic)
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23415 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/generic/patches-2.6.36')
-rw-r--r--target/linux/generic/patches-2.6.36/900-bcm47xx_wdt-noprescale.patch89
1 files changed, 89 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.36/900-bcm47xx_wdt-noprescale.patch b/target/linux/generic/patches-2.6.36/900-bcm47xx_wdt-noprescale.patch
new file mode 100644
index 0000000000..6bc2b12eb0
--- /dev/null
+++ b/target/linux/generic/patches-2.6.36/900-bcm47xx_wdt-noprescale.patch
@@ -0,0 +1,89 @@
+--- a/drivers/watchdog/bcm47xx_wdt.c
++++ b/drivers/watchdog/bcm47xx_wdt.c
+@@ -31,6 +31,7 @@
+
+ #define WDT_DEFAULT_TIME 30 /* seconds */
+ #define WDT_MAX_TIME 255 /* seconds */
++#define WDT_SHIFT 15 /* 32.768 KHz on cores with slow WDT clock */
+
+ static int wdt_time = WDT_DEFAULT_TIME;
+ static int nowayout = WATCHDOG_NOWAYOUT;
+@@ -50,11 +51,11 @@ static unsigned long bcm47xx_wdt_busy;
+ static char expect_release;
+ static struct timer_list wdt_timer;
+ static atomic_t ticks;
++static int needs_sw_scale;
+
+-static inline void bcm47xx_wdt_hw_start(void)
++static inline void bcm47xx_wdt_hw_start(u32 ticks)
+ {
+- /* this is 2,5s on 100Mhz clock and 2s on 133 Mhz */
+- ssb_watchdog_timer_set(&ssb_bcm47xx, 0xfffffff);
++ ssb_watchdog_timer_set(&ssb_bcm47xx, ticks);
+ }
+
+ static inline int bcm47xx_wdt_hw_stop(void)
+@@ -65,33 +66,34 @@ static inline int bcm47xx_wdt_hw_stop(vo
+ static void bcm47xx_timer_tick(unsigned long unused)
+ {
+ if (!atomic_dec_and_test(&ticks)) {
+- bcm47xx_wdt_hw_start();
++ /* This is 2,5s on 100Mhz clock and 2s on 133 Mhz */
++ bcm47xx_wdt_hw_start(0xfffffff);
+ mod_timer(&wdt_timer, jiffies + HZ);
+ } else {
+- printk(KERN_CRIT DRV_NAME "Watchdog will fire soon!!!\n");
++ printk(KERN_CRIT DRV_NAME ": Watchdog will fire soon!!!\n");
+ }
+ }
+
+-static inline void bcm47xx_wdt_pet(void)
++static void bcm47xx_wdt_pet(void)
+ {
+- atomic_set(&ticks, wdt_time);
++ if(needs_sw_scale)
++ atomic_set(&ticks, wdt_time);
++ else
++ bcm47xx_wdt_hw_start(wdt_time << WDT_SHIFT);
+ }
+
+ static void bcm47xx_wdt_start(void)
+ {
+ bcm47xx_wdt_pet();
+- bcm47xx_timer_tick(0);
+-}
+-
+-static void bcm47xx_wdt_pause(void)
+-{
+- del_timer_sync(&wdt_timer);
+- bcm47xx_wdt_hw_stop();
++ if(needs_sw_scale)
++ bcm47xx_timer_tick(0);
+ }
+
+ static void bcm47xx_wdt_stop(void)
+ {
+- bcm47xx_wdt_pause();
++ if(needs_sw_scale)
++ del_timer_sync(&wdt_timer);
++ bcm47xx_wdt_hw_stop();
+ }
+
+ static int bcm47xx_wdt_settimeout(int new_time)
+@@ -243,7 +245,15 @@ static int __init bcm47xx_wdt_init(void)
+ if (bcm47xx_wdt_hw_stop() < 0)
+ return -ENODEV;
+
+- setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
++ /* FIXME Other cores */
++ if(ssb_bcm47xx.chip_id == 0x5354) {
++ /* Slow WDT clock, no pre-scaling */
++ needs_sw_scale = 0;
++ } else {
++ /* Fast WDT clock, needs software pre-scaling */
++ needs_sw_scale = 1;
++ setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
++ }
+
+ if (bcm47xx_wdt_settimeout(wdt_time)) {
+ bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);