This commit adds support for reading the D cache line size for armv7
architecture.
The get_dcache_line_size() function is supposed to work in conjunction
with memalign call to provide D cache aligned DMA buffers.
Signed-off-by: Lukasz Majewski <l.majew...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
CC: Aneesh V <ane...@ti.com>
CC: Albert ARIBAUD <albert.u.b...@aribaud.net>
---
arch/arm/cpu/armv7/cache_v7.c | 25 +++++++++++++++++++++++++
include/common.h | 1 +
2 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/armv7/cache_v7.c b/arch/arm/cpu/armv7/cache_v7.c
index 3e1e1bf..bd0b1a8 100644
--- a/arch/arm/cpu/armv7/cache_v7.c
+++ b/arch/arm/cpu/armv7/cache_v7.c
@@ -246,6 +246,21 @@ static void v7_inval_tlb(void)
CP15ISB;
}
+/* Read the cache line size (bytes) */
+static int v7_dcache_line_size(void)
+{
+ u32 ccsidr, log2_line_len;
+
+ ccsidr = get_ccsidr();
+
+ log2_line_len = ((ccsidr & CCSIDR_LINE_SIZE_MASK) >>
+ CCSIDR_LINE_SIZE_OFFSET) + 2;
+ /* Converting from words to bytes */
+ log2_line_len += 2;
+
+ return 1 << log2_line_len;
+}
+
void invalidate_dcache_all(void)
{
v7_maint_dcache_all(ARMV7_DCACHE_INVAL_ALL);
@@ -303,6 +318,11 @@ void flush_cache(unsigned long start, unsigned long size)
{
flush_dcache_range(start, start + size);
}
+
+int get_dcache_line_size(void)
+{
+ return v7_dcache_line_size();
+}
#else /* #ifndef CONFIG_SYS_DCACHE_OFF */
void invalidate_dcache_all(void)
{
@@ -327,6 +347,11 @@ void arm_init_before_mmu(void)
void flush_cache(unsigned long start, unsigned long size)
{
}
+
+int get_dcache_line_size(void)
+{
+ return 0;
+}
#endif /* #ifndef CONFIG_SYS_DCACHE_OFF */
#ifndef CONFIG_SYS_ICACHE_OFF
diff --git a/include/common.h b/include/common.h
index 12a1074..b535300 100644
--- a/include/common.h
+++ b/include/common.h
@@ -622,6 +622,7 @@ void flush_dcache_range(unsigned long start,
unsigned long stop);
void invalidate_dcache_range(unsigned long start, unsigned long stop);
void invalidate_dcache_all(void);
void invalidate_icache_all(void);
+int get_dcache_line_size(void);
/* arch/$(ARCH)/lib/ticks.S */
unsigned long long get_ticks(void);
--
1.7.2.3
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
