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mec1322: Add support for VBAT backed RAM

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This will be used for saving data across reboots.

BUG=chrome-os-partner:24107
TEST=Enable scratchpad command and check value is preserved across
watchdog reboot.
BRANCH=None

Change-Id: Ifd68541a3f842c466b6ff49bcc654c92df48aac6
Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/178276
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Vic (Chun-Ju) Yang
2013-11-28 12:07:32 +08:00
committed by chrome-internal-fetch
parent 8d2fc77326
commit 0e0bc8bbbd
2 changed files with 17 additions and 0 deletions
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1
chip/mec1322/registers.h
View File

@@ -121,6 +121,7 @@ static inline uintptr_t gpio_port_base(int port_id)
#define MEC1322_VBAT_BASE 0x4000a400
#define MEC1322_VBAT_STS REG32(MEC1322_VBAT_BASE + 0x0)
#define MEC1322_VBAT_CE REG32(MEC1322_VBAT_BASE + 0x8)
#define MEC1322_VBAT_RAM(x) REG32(MEC1322_VBAT_BASE + 0x400 + 4 * (x))
/* LPC */

16
chip/mec1322/system.c
View File

@@ -16,6 +16,11 @@
#include "timer.h"
#include "util.h"
/* Indices for hibernate data registers (RAM backed by VBAT) */
enum hibdata_index {
HIBDATA_INDEX_SCRATCHPAD = 0, /* General-purpose scratchpad */
HIBDATA_INDEX_SAVED_RESET_FLAGS /* Saved reset flags */
};
@@ -78,6 +83,17 @@ int system_set_vbnvcontext(const uint8_t *block)
return EC_ERROR_UNIMPLEMENTED;
}
int system_set_scratchpad(uint32_t value)
{
MEC1322_VBAT_RAM(HIBDATA_INDEX_SCRATCHPAD) = value;
return EC_SUCCESS;
}
uint32_t system_get_scratchpad(void)
{
return MEC1322_VBAT_RAM(HIBDATA_INDEX_SCRATCHPAD);
}
void system_hibernate(uint32_t seconds, uint32_t microseconds)
{
/* TODO(crosbug.com/p/24107): Implement this */