ARM: cache: add an empty stub function for invalidate/flush dcache

Since some driver like ohci, lcd used dcache functions. But some ARM
cpu don't implement the invalidate_dcache_range()/flush_dcache_range()
functions.

To avoid compiling errors this patch adds an weak empty stub function
for all ARM cpu in arch/arm/lib/cache.c.
And ARM cpu still can implemnt its own cache functions on the cpu folder.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Reviewed-by: York Sun <yorksun@freescale.com>

diff --git a/arch/arm/cpu/arm11/cpu.c b/arch/arm/cpu/arm11/cpu.c
index 5d4b3c2a02ba94ff51d82b1e565e85b762214ed3..06dee0fc1b9c7b0073be63e0d89f6e79a4d0e2d7 100644 (file)
--- a/arch/arm/cpu/arm11/cpu.c
+++ b/arch/arm/cpu/arm11/cpu.c
@@ -124,14 +124,6 @@ void flush_dcache_all(void)
 {
 }
 
-void invalidate_dcache_range(unsigned long start, unsigned long stop)
-{
-}
-
-void flush_dcache_range(unsigned long start, unsigned long stop)
-{
-}
-
 void flush_cache(unsigned long start, unsigned long size)
 {
 }

diff --git a/arch/arm/cpu/arm926ejs/cache.c b/arch/arm/cpu/arm926ejs/cache.c
index 8d7873c9af332fc48a2dd511f0df7f7bfcf8e4be..99d1a139b0dc4e5b8b6e1bb5494bcce29bd8ba0b 100644 (file)
--- a/arch/arm/cpu/arm926ejs/cache.c
+++ b/arch/arm/cpu/arm926ejs/cache.c
@@ -83,14 +83,6 @@ void flush_dcache_all(void)
 {
 }
 
-void invalidate_dcache_range(unsigned long start, unsigned long stop)
-{
-}
-
-void flush_dcache_range(unsigned long start, unsigned long stop)
-{
-}
-
 void flush_cache(unsigned long start, unsigned long size)
 {
 }

diff --git a/arch/arm/cpu/armv7/cache_v7.c b/arch/arm/cpu/armv7/cache_v7.c
index e8ee875981f587ac8b32f537f80b76b92c660eef..4f0e4062a2d4de8988c2736319c14e23d2cd708a 100644 (file)
--- a/arch/arm/cpu/armv7/cache_v7.c
+++ b/arch/arm/cpu/armv7/cache_v7.c
@@ -304,14 +304,6 @@ void flush_dcache_all(void)
 {
 }
 
-void invalidate_dcache_range(unsigned long start, unsigned long stop)
-{
-}
-
-void flush_dcache_range(unsigned long start, unsigned long stop)
-{
-}
-
 void arm_init_before_mmu(void)
 {
 }

diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
index c22f7b6a51e6c6b8209a08a8998c1e3eb314cfec..cd160c4b633b94ef33efc2221bd1411497a9bac2 100644 (file)
--- a/arch/arm/cpu/armv8/cache_v8.c
+++ b/arch/arm/cpu/armv8/cache_v8.c
@@ -180,14 +180,6 @@ void flush_dcache_all(void)
 {
 }
 
-void invalidate_dcache_range(unsigned long start, unsigned long stop)
-{
-}
-
-void flush_dcache_range(unsigned long start, unsigned long stop)
-{
-}
-
 void dcache_enable(void)
 {
 }

diff --git a/arch/arm/lib/cache.c b/arch/arm/lib/cache.c
index 74cfde637c1c433f3f834cdfbdac48b05ff78b6a..bc48f53f4c55cf810c53e7c81551a98731a98011 100644 (file)
--- a/arch/arm/lib/cache.c
+++ b/arch/arm/lib/cache.c
@@ -53,6 +53,15 @@ __weak void enable_caches(void)
        puts("WARNING: Caches not enabled\n");
 }
 
+__weak void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+       /* An empty stub, real implementation should be in platform code */
+}
+__weak void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+       /* An empty stub, real implementation should be in platform code */
+}
+
 #ifdef CONFIG_SYS_NONCACHED_MEMORY
 /*
  * Reserve one MMU section worth of address space below the malloc() area that