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ec/google: Add support for the EC 'get time' function 

Some platforms have an RTC provided by the Chrome OS EC. Allow the EC to
implement rtc_get() so that this can be plumbed in.

BUG=chrome-os-partner:52220
BRANCH=none
TEST=(partial) with future commits, boot on gru and see output:
Date: 1970-01-17 (Saturday)  Time:  1:42:44

Then reboot ~10 seconds later and see output:
Date: 1970-01-17 (Saturday)  Time:  1:42:53

Change-Id: I3b38f23b259837cdd4bd99167961b7bd245683b3
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: 4a4a26da37323c9ac33030c8f1510efae5ac2505
Original-Change-Id: Icaa381d32517dfed8d3b7927495b67a027d5ceea
Original-Signed-off-by: Simon Glass <sjg@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/351780
Original-Commit-Ready: Vadim Bendebury <vbendeb@chromium.org>
Original-Tested-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://review.coreboot.org/15302
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Simon Glass 2016-06-10 20:58:24 -06:00 committed by Martin Roth
parent 2cf99e1655
commit 7865932481
2 changed files with 28 additions and 0 deletions
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7
src/ec/google/chromeec/Kconfig
View File

@ -98,3 +98,10 @@ config EC_GOOGLE_CHROMEEC_PD_BOARDNAME
The board name used in the Chrome EC code base to build
the PD firmware. If set, the coreboot build with also
build the EC firmware and add it to the image.
config EC_GOOGLE_CHROMEEC_RTC
depends on EC_GOOGLE_CHROMEEC
bool "Enable Chrome OS EC RTC"
help
Enable support for the real-time clock on the Chrome OS EC. This
uses the EC_CMD_RTC_GET_VALUE command to read the current time.

21
src/ec/google/chromeec/ec.c
View File

@ -22,6 +22,7 @@
#include <halt.h>
#include <reset.h>
#include <elog.h>
#include <rtc.h>
#include <stdlib.h>
#include "chip.h"
@ -142,6 +143,26 @@ int google_chromeec_check_feature(int feature)
return r.flags[feature / 32] & EC_FEATURE_MASK_0(feature);
}
#if IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC_RTC)
int rtc_get(struct rtc_time *time)
{
struct chromeec_command cmd;
struct ec_response_rtc r;
cmd.cmd_code = EC_CMD_RTC_GET_VALUE;
cmd.cmd_version = 0;
cmd.cmd_size_in = 0;
cmd.cmd_data_out = &r;
cmd.cmd_size_out = sizeof(r);
cmd.cmd_dev_index = 0;
if (google_chromeec_command(&cmd) != 0)
return -1;
return rtc_to_tm(r.time, time);
}
#endif
#ifndef __SMM__
#ifdef __PRE_RAM__
void google_chromeec_check_ec_image(int expected_type)