New patch to review for coreboot: 45dfe23 Exynos5420: add code to make sure resume will work on DRAM.

[Gabe Black]

Gabe Black ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3693

-gerrit

commit 45dfe231642ca2b5069a9e2018106266d50621f3
Author: Ronald G. Minnich 
Date:   Wed Jun 19 15:46:25 2013 -0700

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...

Change-Id: Ida2fe2a98be008a4bdfe594cf00d01a33b511b4f
    Signed-off-by: Ronald G. Minnich 
    Signed-off-by: Gabe Black 
---
 src/cpu/samsung/exynos5420/bootblock.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/cpu/samsung/exynos5420/bootblock.c b/src/cpu/samsung/exynos5420/bootblock.c
index d3d737e..5cc9ef6 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.
     */