diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/lib/Kconfig | 9 | ||||
| -rw-r--r-- | arch/powerpc/lib/cache.c | 17 | ||||
| -rw-r--r-- | arch/powerpc/lib/interrupts.c | 2 |
4 files changed, 24 insertions, 5 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 6a2e88fed25..133447648cc 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -49,5 +49,6 @@ source "arch/powerpc/cpu/mpc83xx/Kconfig" source "arch/powerpc/cpu/mpc85xx/Kconfig" source "arch/powerpc/cpu/mpc86xx/Kconfig" source "arch/powerpc/cpu/mpc8xx/Kconfig" +source "arch/powerpc/lib/Kconfig" endmenu diff --git a/arch/powerpc/lib/Kconfig b/arch/powerpc/lib/Kconfig new file mode 100644 index 00000000000..b30b5edf7cf --- /dev/null +++ b/arch/powerpc/lib/Kconfig @@ -0,0 +1,9 @@ +config CACHE_FLUSH_WATCHDOG_THRESHOLD + int "Bytes to flush between WATCHDOG_RESET calls" + default 0 + help + The flush_cache() function periodically, and by default for + every cache line, calls WATCHDOG_RESET(). When flushing a + large area, that may add a significant amount of + overhead. This option allows you to set a threshold for how + many bytes to flush between each WATCHDOG_RESET call. diff --git a/arch/powerpc/lib/cache.c b/arch/powerpc/lib/cache.c index 3c3c470bbbd..19162511cea 100644 --- a/arch/powerpc/lib/cache.c +++ b/arch/powerpc/lib/cache.c @@ -9,10 +9,20 @@ #include <asm/cache.h> #include <watchdog.h> +static ulong maybe_watchdog_reset(ulong flushed) +{ + flushed += CONFIG_SYS_CACHELINE_SIZE; + if (flushed >= CONFIG_CACHE_FLUSH_WATCHDOG_THRESHOLD) { + WATCHDOG_RESET(); + flushed = 0; + } + return flushed; +} + void flush_cache(ulong start_addr, ulong size) { -#ifndef CONFIG_5xx ulong addr, start, end; + ulong flushed = 0; start = start_addr & ~(CONFIG_SYS_CACHELINE_SIZE - 1); end = start_addr + size - 1; @@ -20,7 +30,7 @@ void flush_cache(ulong start_addr, ulong size) for (addr = start; (addr <= end) && (addr >= start); addr += CONFIG_SYS_CACHELINE_SIZE) { asm volatile("dcbst 0,%0" : : "r" (addr) : "memory"); - WATCHDOG_RESET(); + flushed = maybe_watchdog_reset(flushed); } /* wait for all dcbst to complete on bus */ asm volatile("sync" : : : "memory"); @@ -28,10 +38,9 @@ void flush_cache(ulong start_addr, ulong size) for (addr = start; (addr <= end) && (addr >= start); addr += CONFIG_SYS_CACHELINE_SIZE) { asm volatile("icbi 0,%0" : : "r" (addr) : "memory"); - WATCHDOG_RESET(); + flushed = maybe_watchdog_reset(flushed); } asm volatile("sync" : : : "memory"); /* flush prefetch queue */ asm volatile("isync" : : : "memory"); -#endif } diff --git a/arch/powerpc/lib/interrupts.c b/arch/powerpc/lib/interrupts.c index 73f270002cf..5ba4cd0c13a 100644 --- a/arch/powerpc/lib/interrupts.c +++ b/arch/powerpc/lib/interrupts.c @@ -80,7 +80,7 @@ void timer_interrupt(struct pt_regs *regs) timestamp++; #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG) - if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) + if (CONFIG_SYS_WATCHDOG_FREQ && (timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) WATCHDOG_RESET (); #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */ |