brcm47xx: add support for kernel 3.6

This is based on the patch by Peter Wagner.

SVN-Revision: 34252

1 files changed, 103 insertions, 0 deletions

diff --git a/target/linux/brcm47xx/patches-3.6/900-bcm47xx_wdt-noprescale.patch b/target/linux/brcm47xx/patches-3.6/900-bcm47xx_wdt-noprescale.patch
new file mode 100644
index 0000000000..bf0a192684
--- /dev/null
+++ b/target/linux/brcm47xx/patches-3.6/900-bcm47xx_wdt-noprescale.patch
@@ -0,0 +1,103 @@
+--- a/drivers/watchdog/bcm47xx_wdt.c
++++ b/drivers/watchdog/bcm47xx_wdt.c
+@@ -33,6 +33,7 @@
+ 
+ #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 bool nowayout = WATCHDOG_NOWAYOUT;
+@@ -52,20 +53,20 @@ 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 */
+ 	switch (bcm47xx_bus_type) {
+ #ifdef CONFIG_BCM47XX_SSB
+ 	case BCM47XX_BUS_TYPE_SSB:
+-		ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0xfffffff);
++		ssb_watchdog_timer_set(&bcm47xx_bus.ssb, ticks);
+ 		break;
+ #endif
+ #ifdef CONFIG_BCM47XX_BCMA
+ 	case BCM47XX_BUS_TYPE_BCMA:
+ 		bcma_chipco_watchdog_timer_set(&bcm47xx_bus.bcma.bus.drv_cc,
+-					       0xfffffff);
++					       ticks);
+ 		break;
+ #endif
+ 	}
+@@ -90,33 +91,34 @@ 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 {
+ 		pr_crit("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)
+@@ -267,7 +269,20 @@ 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 */
++#ifdef BCM47XX_BUS_TYPE_BCMA
++	if(bcm47xx_bus_type == BCM47XX_BUS_TYPE_BCMA &&
++	   bcm47xx_bus.ssb.chip_id == 0x5354) {
++		/* Slow WDT clock, no pre-scaling */
++		needs_sw_scale = 0;
++	} else {
++#endif
++		/* Fast WDT clock, needs software pre-scaling */
++		needs_sw_scale = 1;
++		setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
++#ifdef BCM47XX_BUS_TYPE_BCMA
++	}
++#endif
+ 
+ 	if (bcm47xx_wdt_settimeout(wdt_time)) {
+ 		bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);