ARM926EJS: Implement cache operations
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/cpu/arm926ejs/cache.c b/arch/arm/cpu/arm926ejs/cache.c
index 504f604..5b23e3a 100644
--- a/arch/arm/cpu/arm926ejs/cache.c
+++ b/arch/arm/cpu/arm926ejs/cache.c
@@ -23,29 +23,71 @@
#include <common.h>
#ifndef CONFIG_SYS_DCACHE_OFF
-static inline void dcache_noop(void)
+
+#ifndef CONFIG_SYS_CACHELINE_SIZE
+#define CONFIG_SYS_CACHELINE_SIZE 32
+#endif
+
+void invalidate_dcache_all(void)
{
- if (dcache_status()) {
- puts("WARNING: cache operations are not implemented!\n"
- "WARNING: disabling D-Cache now, you can re-enable it"
- "later with 'dcache on' command\n");
- dcache_disable();
- }
+ asm volatile("mcr p15, 0, %0, c7, c6, 0\n"::"r"(0));
}
-void invalidate_dcache_all(void)
+void flush_dcache_all(void)
{
- dcache_noop();
+ asm volatile(
+ "0:"
+ "mrc p15, 0, r15, c7, c14, 3\n"
+ "bne 0b\n"
+ "mcr p15, 0, %0, c7, c10, 4\n"
+ ::"r"(0):"memory"
+ );
}
+static int check_cache_range(unsigned long start, unsigned long stop)
+{
+ int ok = 1;
+
+ if (start & (CONFIG_SYS_CACHELINE_SIZE - 1))
+ ok = 0;
+
+ if (stop & (CONFIG_SYS_CACHELINE_SIZE - 1))
+ ok = 0;
+
+ if (!ok)
+ printf("CACHE: Misaligned operation at range [%08lx, %08lx]\n",
+ start, stop);
+
+ return ok;
+}
+
void invalidate_dcache_range(unsigned long start, unsigned long stop)
{
- dcache_noop();
+ if (!check_cache_range(start, stop))
+ return;
+
+ while (start < stop) {
+ asm volatile("mcr p15, 0, %0, c7, c6, 1\n"::"r"(start));
+ start += CONFIG_SYS_CACHELINE_SIZE;
+ }
}
void flush_dcache_range(unsigned long start, unsigned long stop)
{
+ if (!check_cache_range(start, stop))
+ return;
+
+ while (start < stop) {
+ asm volatile("mcr p15, 0, %0, c7, c14, 1\n"::"r"(start));
+ start += CONFIG_SYS_CACHELINE_SIZE;
+ }
+
+ asm("mcr p15, 0, %0, c7, c10, 4\n"::"r"(0));
+}
+
+void flush_cache(unsigned long start, unsigned long size)
+{
- dcache_noop();
+ flush_dcache_range(start, start + size);
}
#else /* #ifndef CONFIG_SYS_DCACHE_OFF */
void invalidate_dcache_all(void)
@@ -64,7 +106,7 @@
{
}
-void flush_cache(unsigned long start, unsigned long size)
+void flush_cache(unsigned long start, unsigned long size)
{
}
#endif /* #ifndef CONFIG_SYS_DCACHE_OFF */