ec/google/wilco: Add power related mailbox commands

Add EC mailbox commands that are related to the power and state of the
system.  These commands include:

- read the power status registers from the EC
- read & clear the power status registers
- helper function to read the current lid state
- tell the EC why the host is about to power off
- tell the EC that the host is about to enter a sleep state

Change-Id: Iaa7051b4006e3c1687933e0384d962516220621f
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/29116
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 99 insertions, 0 deletions

diff --git a/src/ec/google/wilco/commands.c b/src/ec/google/wilco/commands.c
index 9ea8936e10..1767a01aee 100644
--- a/src/ec/google/wilco/commands.c
+++ b/src/ec/google/wilco/commands.c
@@ -50,3 +50,102 @@ void wilco_ec_print_all_info(void)
 	if (!wilco_ec_get_info(GET_EC_BUILD_DATE, info))
 		printk(BIOS_INFO, "EC Build Date : %s\n", info);
 }
+
+static int wilco_ec_get_power_smi(struct ec_pm_event_state *pm)
+{
+	struct ec_response_power_smi {
+		uint8_t pm_event_1;
+		uint8_t pm_state_1;
+		uint8_t hotkey;
+		uint8_t pm_state_2;
+		uint8_t pm_state_3;
+		uint8_t pm_state_4;
+		uint8_t pm_state_5;
+		uint8_t pm_event_2;
+		uint8_t pm_state_6;
+	} __packed rsp;
+
+	if (!pm)
+		return -1;
+	if (wilco_ec_sendrecv_noargs(KB_POWER_SMI, &rsp, sizeof(rsp)) < 0)
+		return -1;
+
+	pm->event[0] = rsp.pm_event_1;
+	pm->event[1] = rsp.pm_event_2;
+	pm->state[0] = rsp.pm_state_1;
+	pm->state[1] = rsp.pm_state_2;
+	pm->state[2] = rsp.pm_state_3;
+	pm->state[3] = rsp.pm_state_4;
+	pm->state[4] = rsp.pm_state_5;
+	pm->state[5] = rsp.pm_state_6;
+	pm->hotkey = rsp.hotkey;
+
+	return 0;
+}
+
+static int wilco_ec_get_power_status(struct ec_pm_event_state *pm)
+{
+	struct ec_response_power_status {
+		uint8_t pm_state_1;
+		uint8_t pm_state_2;
+		uint8_t pm_state_3;
+		uint8_t pm_state_4;
+		uint8_t pm_state_5;
+		uint8_t ac_type_lsb;
+		uint8_t pm_state_6;
+		uint8_t pm_event_2;
+		uint8_t ac_type_msb;
+	} __packed rsp;
+
+	if (!pm)
+		return -1;
+	if (wilco_ec_sendrecv_noargs(KB_POWER_STATUS, &rsp, sizeof(rsp)) < 0)
+		return -1;
+
+	pm->hotkey = 0;
+	pm->event[0] = 0;
+	pm->event[1] = rsp.pm_event_2;
+	pm->state[0] = rsp.pm_state_1;
+	pm->state[1] = rsp.pm_state_2;
+	pm->state[2] = rsp.pm_state_3;
+	pm->state[3] = rsp.pm_state_4;
+	pm->state[4] = rsp.pm_state_5;
+	pm->state[5] = rsp.pm_state_6;
+	pm->ac_type = rsp.ac_type_msb << 8 | rsp.ac_type_lsb;
+
+	return 0;
+}
+
+int wilco_ec_get_pm(struct ec_pm_event_state *pm, bool clear)
+{
+	if (clear)
+		return wilco_ec_get_power_smi(pm);
+	else
+		return wilco_ec_get_power_status(pm);
+}
+
+int wilco_ec_get_lid_state(void)
+{
+	struct ec_pm_event_state pm;
+
+	if (wilco_ec_get_power_status(&pm) < 0)
+		return -1;
+
+	return !!(pm.state[0] & EC_PM1_LID_OPEN);
+}
+
+void wilco_ec_slp_en(void)
+{
+	/* EC does not respond to this command */
+	if (wilco_ec_mailbox(WILCO_EC_MSG_NO_RESPONSE,
+			     KB_SLP_EN, NULL, 0, NULL, 0) < 0)
+		printk(BIOS_ERR, "%s: command failed\n", __func__);
+}
+
+void wilco_ec_power_off(enum ec_power_off_reason reason)
+{
+	/* EC does not respond to this command */
+	if (wilco_ec_mailbox(WILCO_EC_MSG_NO_RESPONSE,
+			     KB_POWER_OFF, &reason, 1, NULL, 0) < 0)
+		printk(BIOS_ERR, "%s: command failed\n", __func__);
+}