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reboot-mode: read the boot mode from RTC memory

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RTC devices could provide battery-backed memory that can be used for
storing the reboot mode magic value.

Add a new reboot-mode back-end that uses RTC to store the reboot-mode
magic value. The driver also supports both endianness modes.

Signed-off-by: Nandor Han <nandor.han@vaisala.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Nandor Han
2021-06-10 16:56:45 +03:00
committed by Tom Rini
parent f9db2f16cb
commit c74675bd90
8 changed files with 215 additions and 0 deletions
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29
test/dm/reboot-mode.c
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@@ -9,10 +9,13 @@
#include <env.h>
#include <log.h>
#include <asm/gpio.h>
#include <asm/rtc.h>
#include <asm/test.h>
#include <dm/test.h>
#include <test/test.h>
#include <test/ut.h>
#include <rtc.h>
#include <linux/byteorder/generic.h>
static int dm_test_reboot_mode_gpio(struct unit_test_state *uts)
{
@@ -40,3 +43,29 @@ static int dm_test_reboot_mode_gpio(struct unit_test_state *uts)
DM_TEST(dm_test_reboot_mode_gpio,
UT_TESTF_PROBE_TEST | UT_TESTF_SCAN_FDT | UT_TESTF_FLAT_TREE);
static int dm_test_reboot_mode_rtc(struct unit_test_state *uts)
{
struct udevice *rtc_dev;
struct udevice *rm_dev;
u32 read_val;
u32 test_magic_val = cpu_to_be32(0x21969147);
uclass_get_device_by_name(UCLASS_RTC, "rtc@43",
&rtc_dev);
dm_rtc_write(rtc_dev, REG_AUX0, (u8 *)&test_magic_val, 4);
ut_assertok(uclass_get_device_by_name(UCLASS_REBOOT_MODE,
"reboot-mode@14", &rm_dev));
ut_assertok(dm_reboot_mode_update(rm_dev));
ut_asserteq_str("test", env_get("bootstatus"));
dm_rtc_read(rtc_dev, REG_AUX0, (u8 *)&read_val, 4);
ut_asserteq(read_val, 0);
return 0;
}
DM_TEST(dm_test_reboot_mode_rtc,
UT_TESTF_PROBE_TEST | UT_TESTF_SCAN_FDT | UT_TESTF_FLAT_TREE);