[U-Boot] [PATCH v4 6/8] riscv: cache: Flush L2 cache before jump to linux

[Andes]

From: Rick Chen <r...@andestech.com>

Flush and disable L2 cache in dcache_disable()
which will be called in cleanup_before_linux()
before jump to linux.

The sequence will be preferred as below:
L1 flush -> L1 disable -> L2 flush -> L2 disable

Signed-off-by: Rick Chen <r...@andestech.com>
Cc: KC Lin <kc...@andestech.com>
Reviewed-by: Bin Meng <bmeng...@gmail.com>
---
 arch/riscv/cpu/ax25/cache.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/riscv/cpu/ax25/cache.c b/arch/riscv/cpu/ax25/cache.c
index cd95058..8f5455e 100644
--- a/arch/riscv/cpu/ax25/cache.c
+++ b/arch/riscv/cpu/ax25/cache.c
@@ -5,6 +5,9 @@
  */
 
 #include <common.h>
+#include <dm.h>
+#include <dm/uclass-internal.h>
+#include <cache.h>
 
 void flush_dcache_all(void)
 {
@@ -59,11 +62,18 @@ void dcache_enable(void)
 {
 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
 #ifdef CONFIG_RISCV_NDS_CACHE
+       struct udevice *dev = NULL;
+
        asm volatile (
                "csrr t1, mcache_ctl\n\t"
                "ori t0, t1, 0x2\n\t"
                "csrw mcache_ctl, t0\n\t"
        );
+
+       uclass_find_first_device(UCLASS_CACHE, &dev);
+
+       if (dev)
+               cache_enable(dev);
 #endif
 #endif
 }
@@ -72,12 +82,19 @@ void dcache_disable(void)
 {
 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
 #ifdef CONFIG_RISCV_NDS_CACHE
+       struct udevice *dev = NULL;
+
        asm volatile (
                "fence\n\t"
                "csrr t1, mcache_ctl\n\t"
                "andi t0, t1, ~0x2\n\t"
                "csrw mcache_ctl, t0\n\t"
        );
+
+       uclass_find_first_device(UCLASS_CACHE, &dev);
+
+       if (dev)
+               cache_disable(dev);
 #endif
 #endif
 }
-- 
2.7.4

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