diff options
Diffstat (limited to 'target/linux/brcm47xx/patches-2.6.36')
| -rw-r--r-- | target/linux/brcm47xx/patches-2.6.36/900-bcm47xx_wdt-noprescale.patch | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-2.6.36/900-bcm47xx_wdt-noprescale.patch b/target/linux/brcm47xx/patches-2.6.36/900-bcm47xx_wdt-noprescale.patch new file mode 100644 index 0000000000..6bc2b12eb0 --- /dev/null +++ b/target/linux/brcm47xx/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); |