diff options
Diffstat (limited to 'arch/powerpc/lib')
| -rw-r--r-- | arch/powerpc/lib/Kconfig | 9 | ||||
| -rw-r--r-- | arch/powerpc/lib/cache.c | 15 |
2 files changed, 22 insertions, 2 deletions
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 3e487f50fe3..19162511cea 100644 --- a/arch/powerpc/lib/cache.c +++ b/arch/powerpc/lib/cache.c @@ -9,9 +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) { ulong addr, start, end; + ulong flushed = 0; start = start_addr & ~(CONFIG_SYS_CACHELINE_SIZE - 1); end = start_addr + size - 1; @@ -19,7 +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"); @@ -27,7 +38,7 @@ 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 */ |