MIPS: Split I & D cache line size config

Allow L1 Icache & L1 Dcache line size to be specified separately, since
there's no architectural mandate that they be the same. The
[id]cache_line_size functions are tidied up to take advantage of the
fact that the Kconfig entries are always present to simply check them
for zero rather than needing to #ifdef on their presence.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
[removed CONFIG_SYS_CACHELINE_SIZE in include/configs/pic32mzdask.h]
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

4 files changed, 25 insertions, 20 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index a79224e525..5c30ae981d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -252,21 +252,27 @@ config SYS_DCACHE_SIZE
 	help
 	  The total size of the L1 Dcache, if known at compile time.
 
+config SYS_DCACHE_LINE_SIZE
+	hex
+	default 0
+	help
+	  The size of L1 Dcache lines, 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
+config SYS_ICACHE_LINE_SIZE
 	int
 	default 0
 	help
-	  The size of L1 cache lines, if known at compile time.
+	  The size of L1 Icache 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
+		SYS_DCACHE_LINE_SIZE = 0 && SYS_ICACHE_LINE_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
diff --git a/arch/mips/include/asm/cache.h b/arch/mips/include/asm/cache.h
index 806bd26ba9..0cea581e5d 100644
--- a/arch/mips/include/asm/cache.h
+++ b/arch/mips/include/asm/cache.h
@@ -12,4 +12,11 @@
 
 #define ARCH_DMA_MINALIGN	(L1_CACHE_BYTES)
 
+/*
+ * CONFIG_SYS_CACHELINE_SIZE is still used in various drivers primarily for
+ * DMA buffer alignment. Satisfy those drivers by providing it as a synonym
+ * of ARCH_DMA_MINALIGN for now.
+ */
+#define CONFIG_SYS_CACHELINE_SIZE ARCH_DMA_MINALIGN
+
 #endif /* __MIPS_CACHE_H__ */
diff --git a/arch/mips/lib/cache.c b/arch/mips/lib/cache.c
index fbaafee8cd..19a42ff831 100644
--- a/arch/mips/lib/cache.c
+++ b/arch/mips/lib/cache.c
@@ -9,23 +9,13 @@
 #include <asm/cacheops.h>
 #include <asm/mipsregs.h>
 
-#ifndef CONFIG_SYS_CACHE_SIZE_AUTO
-
 static inline unsigned long icache_line_size(void)
 {
-	return CONFIG_SYS_CACHELINE_SIZE;
-}
-
-static inline unsigned long dcache_line_size(void)
-{
-	return CONFIG_SYS_CACHELINE_SIZE;
-}
+	unsigned long conf1, il;
 
-#else /* !CONFIG_SYS_CACHELINE_SIZE */
+	if (!config_enabled(CONFIG_SYS_CACHE_SIZE_AUTO))
+		return CONFIG_SYS_ICACHE_LINE_SIZE;
 
-static inline unsigned long icache_line_size(void)
-{
-	unsigned long conf1, il;
 	conf1 = read_c0_config1();
 	il = (conf1 & MIPS_CONF1_IL) >> MIPS_CONF1_IL_SHF;
 	if (!il)
@@ -36,6 +26,10 @@ static inline unsigned long icache_line_size(void)
 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)
@@ -43,8 +37,6 @@ static inline unsigned long dcache_line_size(void)
 	return 2 << dl;
 }
 
-#endif /* !CONFIG_SYS_CACHELINE_SIZE */
-
 void flush_cache(ulong start_addr, ulong size)
 {
 	unsigned long ilsize = icache_line_size();
diff --git a/arch/mips/lib/cache_init.S b/arch/mips/lib/cache_init.S
index 4bb9a17e74..bc8ab27b58 100644
--- a/arch/mips/lib/cache_init.S
+++ b/arch/mips/lib/cache_init.S
@@ -101,14 +101,14 @@
 LEAF(mips_cache_reset)
 #ifndef CONFIG_SYS_CACHE_SIZE_AUTO
 	li	t2, CONFIG_SYS_ICACHE_SIZE
-	li	t8, CONFIG_SYS_CACHELINE_SIZE
+	li	t8, CONFIG_SYS_ICACHE_LINE_SIZE
 #else
 	l1_info	t2, t8, MIPS_CONF1_IA_SHF
 #endif
 
 #ifndef CONFIG_SYS_CACHE_SIZE_AUTO
 	li	t3, CONFIG_SYS_DCACHE_SIZE
-	li	t9, CONFIG_SYS_CACHELINE_SIZE
+	li	t9, CONFIG_SYS_DCACHE_LINE_SIZE
 #else
 	l1_info	t3, t9, MIPS_CONF1_DA_SHF
 #endif