zephyr: Configure tcpci gpio alerts in test

Add GPIOs to overlay.dts.

Setup GPIO interrupts in gpio_map.h.

Implement tcpc_alert_event. This should probably be in a zephyr stub
instead, but today, this is board specific.

Add init hook to enable the usbc interrupts.

Interrupts have to be enabled by a driver or board, and these are
normally enabled by the board.

BRANCH=None
BUG=b:201314530
TEST=Observed in gdb.

Signed-off-by: Jeremy Bettis <jbettis@google.com>
Change-Id: I23bb328ffd5402e923abf8464395ca1dd2dd86de
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3269060
Tested-by: Jeremy Bettis <jbettis@chromium.org>
Auto-Submit: Jeremy Bettis <jbettis@chromium.org>
Commit-Queue: Keith Short <keithshort@chromium.org>
Reviewed-by: Keith Short <keithshort@chromium.org>

3 files changed, 88 insertions, 3 deletions

diff --git a/zephyr/test/drivers/include/gpio_map.h b/zephyr/test/drivers/include/gpio_map.h
index 1f67138bd2..5253b0155a 100644
--- a/zephyr/test/drivers/include/gpio_map.h
+++ b/zephyr/test/drivers/include/gpio_map.h
@@ -20,6 +20,10 @@
 #define CONFIG_TEMP_SENSOR_POWER_GPIO GPIO_PG_EC_DSW_PWROK
 
 #define EC_CROS_GPIO_INTERRUPTS                                           \
-	GPIO_INT(GPIO_AC_PRESENT, GPIO_INT_EDGE_BOTH, extpower_interrupt)
+	GPIO_INT(GPIO_AC_PRESENT, GPIO_INT_EDGE_BOTH, extpower_interrupt) \
+	GPIO_INT(GPIO_USB_C0_TCPC_INT_ODL, GPIO_INT_EDGE_FALLING,	  \
+		 tcpc_alert_event)					  \
+	GPIO_INT(GPIO_USB_C1_TCPC_INT_ODL, GPIO_INT_EDGE_FALLING,	  \
+		 tcpc_alert_event)
 
 #endif /* __ZEPHYR_GPIO_MAP_H */
diff --git a/zephyr/test/drivers/overlay.dts b/zephyr/test/drivers/overlay.dts
index c247caab05..fc0ddc0a6e 100644
--- a/zephyr/test/drivers/overlay.dts
+++ b/zephyr/test/drivers/overlay.dts
@@ -64,6 +64,26 @@
 			enum-name = "GPIO_USB_C1_FRS_EN";
 			label = "USB_C1_FRS_EN";
 		};
+		usb_c0_tcpc_int_odl: usb_c0_tcpc_int_odl {
+			gpios = <&gpio0 9 GPIO_INPUT>;
+			enum-name = "GPIO_USB_C0_TCPC_INT_ODL";
+			label = "USB_C0_TCPC_INT_ODL";
+		};
+		usb_c1_tcpc_int_odl: usb_c1_tcpc_int_odl {
+			gpios = <&gpio0 10 GPIO_INPUT>;
+			enum-name = "GPIO_USB_C1_TCPC_INT_ODL";
+			label = "USB_C1_TCPC_INT_ODL";
+		};
+		usb_c0_tcpc_rst_l {
+			gpios = <&gpio0 11 (GPIO_OUT_HIGH | GPIO_INPUT)>;
+			enum-name = "GPIO_USB_C0_TCPC_RST_L";
+			label = "USB_C0_TCPC_RST_L";
+		};
+		usb_c1_tcpc_rst_l {
+			gpios = <&gpio0 12 (GPIO_OUT_HIGH | GPIO_INPUT)>;
+			enum-name = "GPIO_USB_C1_TCPC_RST_L";
+			label = "USB_C1_TCPC_RST_L";
+		};
 	};
 	named-i2c-ports {
 		compatible = "named-i2c-ports";
@@ -454,6 +474,7 @@
 			status = "okay";
 			reg = <0xb>;
 			label = "TCPCI_PS8XXX_EMUL";
+			alert_gpio = <&usb_c1_tcpc_int_odl>;
 		};
 
 		ps8xxx_emul: ps8xxx_emul {
@@ -518,7 +539,7 @@
 };
 
 &gpio0 {
-	ngpios = <9>;
+	ngpios = <13>;
 };
 
 &i2c0 {
@@ -607,6 +628,7 @@
 		status = "okay";
 		reg = <0x82>;
 		label = "TCPCI_EMUL";
+		alert_gpio = <&usb_c0_tcpc_int_odl>;
 	};
 };
 
diff --git a/zephyr/test/drivers/src/stubs.c b/zephyr/test/drivers/src/stubs.c
index 523c8a5011..68aab8ba12 100644
--- a/zephyr/test/drivers/src/stubs.c
+++ b/zephyr/test/drivers/src/stubs.c
@@ -11,6 +11,7 @@
 #include "charger/isl923x_public.h"
 #include "charger/isl9241_public.h"
 #include "config.h"
+#include "hooks.h"
 #include "i2c/i2c.h"
 #include "power.h"
 #include "ppc/sn5s330_public.h"
@@ -240,7 +241,23 @@ void system_hibernate(uint32_t seconds, uint32_t microseconds)
 
 uint16_t tcpc_get_alert_status(void)
 {
-	return 0;
+	uint16_t status = 0;
+
+	/*
+	 * Check which port has the ALERT line set and ignore if that TCPC has
+	 * its reset line active.
+	 */
+	if (!gpio_get_level(GPIO_USB_C0_TCPC_INT_ODL)) {
+		if (gpio_get_level(GPIO_USB_C0_TCPC_RST_L) != 0)
+			status |= PD_STATUS_TCPC_ALERT_0;
+	}
+
+	if (!gpio_get_level(GPIO_USB_C1_TCPC_INT_ODL)) {
+		if (gpio_get_level(GPIO_USB_C1_TCPC_RST_L) != 0)
+			status |= PD_STATUS_TCPC_ALERT_1;
+	}
+
+	return status;
 }
 
 enum power_state power_chipset_init(void)
@@ -271,3 +288,45 @@ void chipset_force_shutdown(enum chipset_shutdown_reason reason)
 
 /* Power signals list. Must match order of enum power_signal. */
 const struct power_signal_info power_signal_list[] = {};
+
+void tcpc_alert_event(enum gpio_signal signal)
+{
+	int port;
+
+	switch (signal) {
+	case GPIO_USB_C0_TCPC_INT_ODL:
+		port = 0;
+		break;
+	case GPIO_USB_C1_TCPC_INT_ODL:
+		port = 1;
+		break;
+	default:
+		return;
+	}
+
+	schedule_deferred_pd_interrupt(port);
+}
+
+/* TODO: This code should really be generic, and run based on something in
+ * the dts.
+ */
+static void usbc_interrupt_init(void)
+{
+	/* Enable TCPC interrupts. */
+	gpio_enable_interrupt(GPIO_USB_C0_TCPC_INT_ODL);
+	gpio_enable_interrupt(GPIO_USB_C1_TCPC_INT_ODL);
+
+	cprints(CC_USB, "Resetting TCPCs...");
+	cflush();
+
+	/* Reset generic TCPCI on port 0. */
+	gpio_set_level(GPIO_USB_C0_TCPC_RST_L, 0);
+	msleep(1);
+	gpio_set_level(GPIO_USB_C0_TCPC_RST_L, 1);
+
+	/* Reset PS8XXX on port 1. */
+	gpio_set_level(GPIO_USB_C1_TCPC_RST_L, 0);
+	msleep(PS8XXX_RESET_DELAY_MS);
+	gpio_set_level(GPIO_USB_C1_TCPC_RST_L, 1);
+}
+DECLARE_HOOK(HOOK_INIT, usbc_interrupt_init, HOOK_PRIO_INIT_I2C + 1);