cr50: return the time since user_pres was asserted

Add a vendor command that returns the time since user_pres_l was
asserted. This is only used for testing.

Tracking user_pres_l needs to be enabled with a vendor command since
DIOM4 may not be pulled up and may be pulled down on old boards.
Enabling the vendor command survives deep sleep reset. It gets cleared
after cr50 reset.

Cr50 clears the user_pres_l status if tracking is disabled.

BUG=b:219981194,b:208504127
TEST=manual
	# Verify it survives deep sleep
	sudo gsctool -y enable

	sudo gsctool -y
	...
	user pres enabled

	# enter deep sleep

	sudo gsctool -y
	...
	user pres enabled

	# Verify it doesn't survive cr50 reboot
	sudo gsctool -y enable

	sudo gsctool -y
	...
	user pres enabled

	cr50 > reboot

	sudo gsctool -y
	...
	user pres disabled

	# Check gsctool output after triggering DIOM4 pulse
	sudo gsctool -y enable

	# Trigger pulse and wait 5 seconds

	sudo gsctool -y
	...
	user pres enabled
	last press: 5064331

Change-Id: Ib37980a5cd8d3378bf718e8e32a7d4152435a816
Signed-off-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3495863
Reviewed-by: Vadim Sukhomlinov <sukhomlinov@chromium.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/board/cr50/board.c b/board/cr50/board.c
index 567ef45d27..b47bb4f611 100644
--- a/board/cr50/board.c
+++ b/board/cr50/board.c
@@ -189,6 +189,25 @@ int board_get_ccd_rec_lid_pin(void)
 	return board_properties & BOARD_CCD_REC_LID_PIN_MASK;
 }
 
+int board_use_diom4(void)
+{
+	return !!(board_properties & BOARD_USE_DIOM4);
+}
+
+void board_write_prop(uint32_t flag, uint8_t enable)
+{
+	GWRITE_FIELD(PMU, LONG_LIFE_SCRATCH_WR_EN, REG1, 1);
+	/* Update board_properties and long life scratch. */
+	if (enable) {
+		board_properties |= flag;
+		GREG32(PMU, LONG_LIFE_SCRATCH1) |= flag;
+	} else {
+		board_properties &= ~flag;
+		GREG32(PMU, LONG_LIFE_SCRATCH1) &= ~flag;
+	}
+	/* Disable access to LONG_LIFE_SCRATCH1 reg */
+	GWRITE_FIELD(PMU, LONG_LIFE_SCRATCH_WR_EN, REG1, 0);
+}
 
 /* Get header address of the backup RW copy. */
 const struct SignedHeader *get_other_rw_addr(void)