MIPS: Probe cache line sizes once during boot
Rather than probing the cache line sizes on every call of any cache
maintenance function, probe them once during boot & store the values in
the global data structure for later use. This will reduce the overhead
of the cache maintenance functions, which isn't a big deal yet but
becomes more important once L2 caches which may expose their properties
via coprocessor 2 or the CM are supported.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
diff --git a/arch/mips/lib/cache.c b/arch/mips/lib/cache.c
index db81953..d8baf08 100644
--- a/arch/mips/lib/cache.c
+++ b/arch/mips/lib/cache.c
@@ -9,32 +9,39 @@
#include <asm/cacheops.h>
#include <asm/mipsregs.h>
-static inline unsigned long icache_line_size(void)
-{
- unsigned long conf1, il;
+DECLARE_GLOBAL_DATA_PTR;
- if (!config_enabled(CONFIG_SYS_CACHE_SIZE_AUTO))
- return CONFIG_SYS_ICACHE_LINE_SIZE;
+void mips_cache_probe(void)
+{
+#ifdef CONFIG_SYS_CACHE_SIZE_AUTO
+ unsigned long conf1, il, dl;
conf1 = read_c0_config1();
+
il = (conf1 & MIPS_CONF1_IL) >> MIPS_CONF1_IL_SHF;
- if (!il)
- return 0;
- return 2 << il;
+ dl = (conf1 & MIPS_CONF1_DL) >> MIPS_CONF1_DL_SHF;
+
+ gd->arch.l1i_line_size = il ? (2 << il) : 0;
+ gd->arch.l1d_line_size = dl ? (2 << dl) : 0;
+#endif
+}
+
+static inline unsigned long icache_line_size(void)
+{
+#ifdef CONFIG_SYS_CACHE_SIZE_AUTO
+ return gd->arch.l1i_line_size;
+#else
+ return CONFIG_SYS_ICACHE_LINE_SIZE;
+#endif
}
static inline unsigned long dcache_line_size(void)
{
- unsigned long conf1, dl;
-
- if (!config_enabled(CONFIG_SYS_CACHE_SIZE_AUTO))
- return CONFIG_SYS_DCACHE_LINE_SIZE;
-
- conf1 = read_c0_config1();
- dl = (conf1 & MIPS_CONF1_DL) >> MIPS_CONF1_DL_SHF;
- if (!dl)
- return 0;
- return 2 << dl;
+#ifdef CONFIG_SYS_CACHE_SIZE_AUTO
+ return gd->arch.l1d_line_size;
+#else
+ return CONFIG_SYS_DCACHE_LINE_SIZE;
+#endif
}
#define cache_loop(start, end, lsize, ops...) do { \