honeybuns: Add USB-PD for port C1 (user facing ALT-DP)

This CL adds support for honeybuns C1, which is the user facing usbc
port that also support ALT-DP mode. This CL adds support for both
gingergread and quiche.

Note that gingerbread is being checked in with a TODO for specifying
the PPC driver for C1. This is necessary to allow gingerbread to still
build while the solution for asymmetric port hardware is finalized.

BUG=b:183289386
BRANCH=None
TEST=Verified port C1 attaches to display adapters, usbpd hubs, and
type-c monitors

Signed-off-by: Scott Collyer <scollyer@google.com>
Change-Id: Iafbd5a38917601fc5055857662dd0e893d503948
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2699456
Tested-by: Scott Collyer <scollyer@chromium.org>
Reviewed-by: Diana Z <dzigterman@chromium.org>
Commit-Queue: Scott Collyer <scollyer@chromium.org>

4 files changed, 85 insertions, 8 deletions

diff --git a/board/gingerbread/board.c b/board/gingerbread/board.c
index 82f02da6d3..d20b09b067 100644
--- a/board/gingerbread/board.c
+++ b/board/gingerbread/board.c
@@ -44,6 +44,7 @@
 #ifdef SECTION_IS_RW
 static int pd_dual_role_init[CONFIG_USB_PD_PORT_MAX_COUNT] = {
 	PD_DRP_TOGGLE_ON,
+	PD_DRP_FORCE_SOURCE,
 };
 
 static void ppc_interrupt(enum gpio_signal signal)
@@ -58,6 +59,21 @@ static void ppc_interrupt(enum gpio_signal signal)
 	}
 }
 
+static void tcpc_alert_event(enum gpio_signal s)
+{
+	int port = -1;
+
+	switch (s) {
+	case GPIO_USBC_DP_MUX_ALERT_ODL:
+		port = USB_PD_PORT_DP;
+		break;
+	default:
+		return;
+	}
+
+	schedule_deferred_pd_interrupt(port);
+}
+
 void hpd_interrupt(enum gpio_signal signal)
 {
 	usb_pd_hpd_edge_event(signal);
@@ -123,11 +139,24 @@ struct ppc_config_t ppc_chips[] = {
 #endif
 
 #ifdef SECTION_IS_RW
+/*
+ * TCPCs: 2 USBC/PD ports
+ *     port 0 -> host port              -> STM32G4 UCPD
+ *     port 1 -> user data/display port -> PS8805
+ */
 const struct tcpc_config_t tcpc_config[CONFIG_USB_PD_PORT_MAX_COUNT] = {
 	{
 		.bus_type = EC_BUS_TYPE_EMBEDDED,
 		.drv = &stm32gx_tcpm_drv,
 	},
+	{
+		.bus_type = EC_BUS_TYPE_I2C,
+		.i2c_info = {
+			.port = I2C_PORT_I2C3,
+			.addr_flags = PS8751_I2C_ADDR2_FLAGS,
+		},
+		.drv = &ps8xxx_tcpm_drv,
+	},
 };
 
 const struct usb_mux usb_muxes[CONFIG_USB_PD_PORT_MAX_COUNT] = {
@@ -137,15 +166,30 @@ const struct usb_mux usb_muxes[CONFIG_USB_PD_PORT_MAX_COUNT] = {
 		.i2c_addr_flags = TUSB1064_I2C_ADDR0_FLAGS,
 		.driver = &tusb1064_usb_mux_driver,
 	},
+	[USB_PD_PORT_DP] = {
+		.usb_port = USB_PD_PORT_DP,
+		.i2c_port = I2C_PORT_I2C3,
+		.i2c_addr_flags = PS8751_I2C_ADDR2_FLAGS,
+		.driver = &tcpci_tcpm_usb_mux_driver,
+		.hpd_update = &ps8xxx_tcpc_update_hpd_status,
+	},
 };
 
 /* USB-C PPC Configuration */
 struct ppc_config_t ppc_chips[CONFIG_USB_PD_PORT_MAX_COUNT] = {
 	[USB_PD_PORT_HOST] = {
-		.i2c_port = 2,
+		.i2c_port = I2C_PORT_I2C3,
 		.i2c_addr_flags = SN5S330_ADDR0_FLAGS,
 		.drv = &sn5s330_drv
 	},
+	/*
+	 * TODO(b/159330563): The stub driver has not yet landed (and may not
+	 * land) in TOT. Need to comment this out for now, until the correct
+	 * solution for asymmetrical port hardware exists.
+	 */
+	[USB_PD_PORT_DP] = {
+		/* .drv = &ppc_stub_drv */
+	},
 };
 unsigned int ppc_cnt = ARRAY_SIZE(ppc_chips);
 
@@ -156,7 +200,20 @@ const struct hpd_to_pd_config_t hpd_config = {
 
 void board_reset_pd_mcu(void)
 {
-
+	cprints(CC_SYSTEM, "Resetting TCPCs...");
+	cflush();
+	/*
+	 * Reset all TCPCs.
+	 *   C0 -> ucpd (on chip TCPC)
+	 *   C1 -> PS8805 TCPC -> USBC_DP_PD_RST_L
+	 *   C2 -> PS8803 TCPC -> USBC_UF_RESET_L
+	 */
+	gpio_set_level(GPIO_USBC_DP_PD_RST_L, 0);
+	gpio_set_level(GPIO_USBC_UF_RESET_L, 0);
+	msleep(PS8805_FW_INIT_DELAY_MS);
+	gpio_set_level(GPIO_USBC_DP_PD_RST_L, 1);
+	gpio_set_level(GPIO_USBC_UF_RESET_L, 1);
+	msleep(PS8805_FW_INIT_DELAY_MS);
 }
 
 
@@ -168,6 +225,9 @@ void board_tcpc_init(void)
 	/* Enable PPC interrupts. */
 	gpio_enable_interrupt(GPIO_HOST_USBC_PPC_INT_ODL);
 
+	/* Enable TCPC interrupts. */
+	gpio_enable_interrupt(GPIO_USBC_DP_MUX_ALERT_ODL);
+
 	/* Enable HPD interrupt */
 	gpio_enable_interrupt(GPIO_DDI_MST_IN_HPD);
 
@@ -187,6 +247,17 @@ int ppc_get_alert_status(int port)
 	return 0;
 }
 
+uint16_t tcpc_get_alert_status(void)
+{
+	uint16_t status = 0;
+
+	if (!gpio_get_level(GPIO_USBC_DP_MUX_ALERT_ODL) &&
+	    gpio_get_level(GPIO_USBC_DP_PD_RST_L))
+		status |= PD_STATUS_TCPC_ALERT_1;
+
+	return status;
+}
+
 void board_overcurrent_event(int port, int is_overcurrented)
 {
 	/* TODO: b/ - check correct operation for honeybuns */
diff --git a/board/gingerbread/board.h b/board/gingerbread/board.h
index 1c5983cf68..21883367d0 100644
--- a/board/gingerbread/board.h
+++ b/board/gingerbread/board.h
@@ -14,15 +14,21 @@
 /* Optional features */
 #define CONFIG_SYSTEM_UNLOCKED /* Allow dangerous commands while in dev. */
 
-#undef CONFIG_UART_TX_BUF_SIZE
-#define CONFIG_UART_TX_BUF_SIZE 4096
+#define CONFIG_WP_ACTIVE_HIGH
+
+/* Console */
+#define CONFIG_UART_CONSOLE 3
+#define CONFIG_UART_TX_DMA_CH STM32_DMAC_USART3_TX
+#define CONFIG_UART_TX_DMA_PH DMAMUX_REQ_USART3_TX
 
 /* USB Type C and USB PD defines */
 #define USB_PD_PORT_HOST   0
 #define USB_PD_PORT_DP   1
 
-#define CONFIG_USB_PD_PORT_MAX_COUNT 1
+#define CONFIG_USB_PD_PORT_MAX_COUNT 2
 #define CONFIG_USB_MUX_TUSB1064
+#define CONFIG_USBC_PPC_STUB
+#define CONFIG_USB_PD_VBUS_ALERT_TCPC
 
 #define CONFIG_USB_PID 0x5049
 #define CONFIG_USB_BCD_DEV 0x0001 /* v 0.01 */
diff --git a/board/gingerbread/ec.tasklist b/board/gingerbread/ec.tasklist
index f884f8df16..a7c0eb9b2c 100644
--- a/board/gingerbread/ec.tasklist
+++ b/board/gingerbread/ec.tasklist
@@ -12,4 +12,6 @@
 	TASK_ALWAYS(HOOKS, hook_task, NULL, LARGER_TASK_STACK_SIZE) \
 	TASK_ALWAYS(CONSOLE, console_task, NULL, VENTI_TASK_STACK_SIZE) \
 	TASK_ALWAYS_RW(PD_C0, pd_task, NULL, VENTI_TASK_STACK_SIZE) \
+	TASK_ALWAYS_RW(PD_C1, pd_task, NULL, VENTI_TASK_STACK_SIZE) \
+	TASK_ALWAYS_RW(PD_INT_C1, pd_interrupt_handler_task, 1, LARGER_TASK_STACK_SIZE) \
 	TASK_ALWAYS_RW(UCPD, ucpd_task, 0, LARGER_TASK_STACK_SIZE)
diff --git a/board/gingerbread/gpio.inc b/board/gingerbread/gpio.inc
index 532903a98b..0c54a9800d 100644
--- a/board/gingerbread/gpio.inc
+++ b/board/gingerbread/gpio.inc
@@ -10,9 +10,7 @@
 
 #ifdef SECTION_IS_RW
 GPIO_INT(HOST_USBC_PPC_INT_ODL,  PIN(C, 1),       GPIO_INT_FALLING | GPIO_PULL_UP,  ppc_interrupt)
-/* TODO (b/183289386): These singals are required for C1 operation.
- * GPIO_INT(USBC_DP_MUX_ALERT_ODL,  PIN(C, 12),       GPIO_INT_FALLING | GPIO_PULL_UP,   tcpc_alert_event)
- */
+GPIO_INT(USBC_DP_MUX_ALERT_ODL,  PIN(C, 12),       GPIO_INT_FALLING | GPIO_PULL_UP,   tcpc_alert_event)
 GPIO_INT(DDI_MST_IN_HPD,         PIN(C, 14),      GPIO_INT_BOTH, hpd_interrupt)
 #endif