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authorFlorian Fainelli <florian@openwrt.org>2010-10-18 19:49:48 +0000
committerFlorian Fainelli <florian@openwrt.org>2010-10-18 19:49:48 +0000
commitc8c0d4d8e69535d201d16772dbf2c4cc1867220f (patch)
treeeb0c6750eb040487a052c000ab86dae7db5567a2 /target/linux/brcm47xx/patches-2.6.35
parent8a6ee777b029d89d6dbd89ea786d699072731c2f (diff)
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Add support for cores with slow WDT clock (bcm5354)
Signed-off-by: Aleksandar Radovanovic <biblbroks@sezampro.rs> SVN-Revision: 23516
Diffstat (limited to 'target/linux/brcm47xx/patches-2.6.35')
-rw-r--r--target/linux/brcm47xx/patches-2.6.35/900-bcm47xx_wdt-noprescale.patch89
1 files changed, 89 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-2.6.35/900-bcm47xx_wdt-noprescale.patch b/target/linux/brcm47xx/patches-2.6.35/900-bcm47xx_wdt-noprescale.patch
new file mode 100644
index 0000000000..6bc2b12eb0
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.35/900-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);