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authorRonald G. Minnich <rminnich@google.com>2013-06-19 15:46:25 -0700
committerStefan Reinauer <stefan.reinauer@coreboot.org>2013-07-10 22:44:21 +0200
commit005151047ed5ab875905a5b3ee3942d09039b945 (patch)
tree58e1c031b589e9fc98c8f3b1d4cc61663c3fec3b
parent6b0bab916a59c6270a1f0fd53002e568052f2b45 (diff)
Exynos5420: add code to make sure resume will work on DRAM.
Found during a perusal of u-boot changes. It looks important. For more info: http://git.chromium.org/gitweb/?p=chromiumos/third_party/u-boot.git;a=commit;h=56eab63922d2b2380518238ae03e8d69e99af4fe Change-Id: Ida2fe2a98be008a4bdfe594cf00d01a33b511b4f Signed-off-by: Ronald G. Minnich <rminnich@google.com> Signed-off-by: Gabe Black <gabeblack@chromium.org> Reviewed-on: http://review.coreboot.org/3693 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
-rw-r--r--src/cpu/samsung/exynos5420/bootblock.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/cpu/samsung/exynos5420/bootblock.c b/src/cpu/samsung/exynos5420/bootblock.c
index d3d737e035..5cc9ef6af2 100644
--- a/src/cpu/samsung/exynos5420/bootblock.c
+++ b/src/cpu/samsung/exynos5420/bootblock.c
@@ -19,10 +19,28 @@
#include "clk.h"
#include "wakeup.h"
+#include "cpu.h"
void bootblock_cpu_init(void);
void bootblock_cpu_init(void)
{
+ u32 ret;
+ /*
+ * During Suspend-Resume & S/W-Reset, as soon as PMU releases
+ * pad retention, CKE goes high. This causes memory contents
+ * not to be retained during DRAM initialization. Therfore,
+ * there is a new control register(0x100431e8[28]) which lets us
+ * release pad retention and retain the memory content until the
+ * initialization is complete.
+ */
+ if (read32(((void *)INF_REG_BASE + INF_REG1_OFFSET)) == S5P_CHECK_SLEEP) {
+ write32(PAD_RETENTION_DRAM_COREBLK_VAL,
+ (void *)PAD_RETENTION_DRAM_COREBLK_OPTION);
+ do {
+ ret = read32((void *)PAD_RETENTION_DRAM_STATUS);
+ } while (ret != 0x1);
+ }
+
/* kick off the multi-core timer.
* We want to do this as early as we can.
*/