3 files changed, 32 insertions, 4 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index a929452..a79224e 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -246,6 +246,34 @@ config SWAP_IO_SPACE
 config SYS_MIPS_CACHE_INIT_RAM_LOAD
 	bool
 
+config SYS_DCACHE_SIZE
+	int
+	default 0
+	help
+	  The total size of the L1 Dcache, if known at compile time.
+
+config SYS_ICACHE_SIZE
+	int
+	default 0
+	help
+	  The total size of the L1 ICache, if known at compile time.
+
+config SYS_CACHELINE_SIZE
+	int
+	default 0
+	help
+	  The size of L1 cache lines, if known at compile time.
+
+config SYS_CACHE_SIZE_AUTO
+	def_bool y if SYS_DCACHE_SIZE = 0 && SYS_ICACHE_SIZE = 0 && \
+		SYS_CACHELINE_SIZE = 0
+	help
+	  Select this (or let it be auto-selected by not defining any cache
+	  sizes) in order to allow U-Boot to automatically detect the sizes
+	  of caches at runtime. This has a small cost in code size & runtime
+	  so if you know the cache configuration for your system at compile
+	  time it would be beneficial to configure it.
+
 config MIPS_L1_CACHE_SHIFT_4
 	bool
 
diff --git a/arch/mips/lib/cache.c b/arch/mips/lib/cache.c
index 7482005..fbaafee 100644
--- a/arch/mips/lib/cache.c
+++ b/arch/mips/lib/cache.c
@@ -9,7 +9,7 @@
 #include <asm/cacheops.h>
 #include <asm/mipsregs.h>
 
-#ifdef CONFIG_SYS_CACHELINE_SIZE
+#ifndef CONFIG_SYS_CACHE_SIZE_AUTO
 
 static inline unsigned long icache_line_size(void)
 {
diff --git a/arch/mips/lib/cache_init.S b/arch/mips/lib/cache_init.S
index 08b7c3a..4bb9a17 100644
--- a/arch/mips/lib/cache_init.S
+++ b/arch/mips/lib/cache_init.S
@@ -99,14 +99,14 @@
  *
  */
 LEAF(mips_cache_reset)
-#ifdef CONFIG_SYS_ICACHE_SIZE
+#ifndef CONFIG_SYS_CACHE_SIZE_AUTO
 	li	t2, CONFIG_SYS_ICACHE_SIZE
 	li	t8, CONFIG_SYS_CACHELINE_SIZE
 #else
 	l1_info	t2, t8, MIPS_CONF1_IA_SHF
 #endif
 
-#ifdef CONFIG_SYS_DCACHE_SIZE
+#ifndef CONFIG_SYS_CACHE_SIZE_AUTO
 	li	t3, CONFIG_SYS_DCACHE_SIZE
 	li	t9, CONFIG_SYS_CACHELINE_SIZE
 #else
@@ -116,7 +116,7 @@ LEAF(mips_cache_reset)
 #ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
 
 	/* Determine the largest L1 cache size */
-#if defined(CONFIG_SYS_ICACHE_SIZE) && defined(CONFIG_SYS_DCACHE_SIZE)
+#ifndef CONFIG_SYS_CACHE_SIZE_AUTO
 #if CONFIG_SYS_ICACHE_SIZE > CONFIG_SYS_DCACHE_SIZE
 	li	v0, CONFIG_SYS_ICACHE_SIZE
 #else