diff options
| -rw-r--r-- | src/cpu/samsung/exynos5420/bootblock.c | 18 |
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. */ |