1 files changed, 221 insertions, 0 deletions
diff --git a/baseboard/asurada/usb_pd_policy.c b/baseboard/asurada/usb_pd_policy.c
new file mode 100644
index 0000000000..9e90eb95a3
--- /dev/null
+++ b/baseboard/asurada/usb_pd_policy.c
@@ -0,0 +1,221 @@
+/* Copyright 2020 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "charge_manager.h"
+#include "chipset.h"
+#include "timer.h"
+#include "usb_dp_alt_mode.h"
+#include "usb_mux.h"
+#include "usb_pd.h"
+#include "usbc_ppc.h"
+
+#if CONFIG_USB_PD_3A_PORTS != 1
+#error Asurada reference must have at least one 3.0 A port
+#endif
+
+#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
+#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
+
+/* The port that the aux channel is on. */
+static enum {
+	AUX_PORT_NONE = -1,
+	AUX_PORT_C0 = 0,
+	AUX_PORT_C1HDMI = 1,
+} aux_port = AUX_PORT_NONE;
+
+int svdm_get_hpd_gpio(int port)
+{
+	/* HPD is low active, inverse the result */
+	return !gpio_get_level(GPIO_EC_DPBRDG_HPD_ODL);
+}
+
+void svdm_set_hpd_gpio(int port, int en)
+{
+	/*
+	 * HPD is low active, inverse the en
+	 * TODO: C0&C1 shares the same HPD, implement FCFS policy.
+	 */
+	gpio_set_level(GPIO_EC_DPBRDG_HPD_ODL, !en);
+}
+
+static void aux_switch_port(int port)
+{
+	if (port != AUX_PORT_NONE)
+		gpio_set_level_verbose(CC_USBPD, GPIO_DP_AUX_PATH_SEL, port);
+	aux_port = port;
+}
+
+static void aux_display_disconnected(int port)
+{
+	/* Gets the other port. C0 -> C1, C1 -> C0. */
+	int other_port = !port;
+
+	/* If the current port is not the aux port, nothing needs to be done. */
+	if (aux_port != port)
+		return;
+
+	/* If the other port is connected to a external display, switch aux. */
+	if (dp_status[other_port] & DP_FLAGS_DP_ON)
+		aux_switch_port(other_port);
+	else
+		aux_switch_port(AUX_PORT_NONE);
+}
+
+__override int svdm_dp_attention(int port, uint32_t *payload)
+{
+	int lvl = PD_VDO_DPSTS_HPD_LVL(payload[1]);
+	int irq = PD_VDO_DPSTS_HPD_IRQ(payload[1]);
+#ifdef CONFIG_USB_PD_DP_HPD_GPIO
+	int cur_lvl = svdm_get_hpd_gpio(port);
+#endif /* CONFIG_USB_PD_DP_HPD_GPIO */
+
+	dp_status[port] = payload[1];
+
+	if (chipset_in_state(CHIPSET_STATE_ANY_SUSPEND) &&
+	    (irq || lvl))
+		/*
+		 * Wake up the AP.  IRQ or level high indicates a DP sink is now
+		 * present.
+		 */
+		if (IS_ENABLED(CONFIG_MKBP_EVENT))
+			pd_notify_dp_alt_mode_entry(port);
+
+	/* Its initial DP status message prior to config */
+	if (!(dp_flags[port] & DP_FLAGS_DP_ON)) {
+		if (lvl)
+			dp_flags[port] |= DP_FLAGS_HPD_HI_PENDING;
+		return 1;
+	}
+
+#ifdef CONFIG_USB_PD_DP_HPD_GPIO
+	if (irq && !lvl) {
+		/*
+		 * IRQ can only be generated when the level is high, because
+		 * the IRQ is signaled by a short low pulse from the high level.
+		 */
+		CPRINTF("ERR:HPD:IRQ&LOW\n");
+		return 0; /* nak */
+	}
+
+	if (irq && cur_lvl) {
+		uint64_t now = get_time().val;
+		/* wait for the minimum spacing between IRQ_HPD if needed */
+		if (now < svdm_hpd_deadline[port])
+			usleep(svdm_hpd_deadline[port] - now);
+
+		/* generate IRQ_HPD pulse */
+		svdm_set_hpd_gpio(port, 0);
+		/*
+		 * b/171172053#comment14: since the HPD_DSTREAM_DEBOUNCE_IRQ is
+		 * very short (500us), we can use udelay instead of usleep for
+		 * more stable pulse period.
+		 */
+		udelay(HPD_DSTREAM_DEBOUNCE_IRQ);
+		svdm_set_hpd_gpio(port, 1);
+	} else {
+		svdm_set_hpd_gpio(port, lvl);
+	}
+
+	/*
+	 * Asurada can only output to 1 display port at a time.
+	 * This implements FCFS policy by changing the aux channel. If a
+	 * display is connected to the either port (says A), and the port A
+	 * will be served until the display is disconnected from port A.
+	 * It won't output to the other display which connects to port B.
+	 */
+	if (lvl && aux_port == AUX_PORT_NONE)
+		/*
+		 * A display is connected, and no display was plugged on either
+		 * port.
+		 */
+		aux_switch_port(port);
+	else if (!lvl)
+		aux_display_disconnected(port);
+
+
+	/* set the minimum time delay (2ms) for the next HPD IRQ */
+	svdm_hpd_deadline[port] = get_time().val + HPD_USTREAM_DEBOUNCE_LVL;
+#endif /* CONFIG_USB_PD_DP_HPD_GPIO */
+
+	usb_mux_hpd_update(port, lvl, irq);
+
+#ifdef USB_PD_PORT_TCPC_MST
+	if (port == USB_PD_PORT_TCPC_MST)
+		baseboard_mst_enable_control(port, lvl);
+#endif
+
+	/* ack */
+	return 1;
+}
+
+__override void svdm_exit_dp_mode(int port)
+{
+#ifdef CONFIG_USB_PD_DP_HPD_GPIO
+	svdm_set_hpd_gpio(port, 0);
+#endif /* CONFIG_USB_PD_DP_HPD_GPIO */
+	usb_mux_hpd_update(port, 0, 0);
+
+	aux_display_disconnected(port);
+
+#ifdef USB_PD_PORT_TCPC_MST
+	if (port == USB_PD_PORT_TCPC_MST)
+		baseboard_mst_enable_control(port, 0);
+#endif
+}
+
+int pd_snk_is_vbus_provided(int port)
+{
+	return ppc_is_vbus_present(port);
+}
+
+void pd_power_supply_reset(int port)
+{
+	int prev_en;
+
+	prev_en = ppc_is_sourcing_vbus(port);
+
+	/* Disable VBUS. */
+	ppc_vbus_source_enable(port, 0);
+
+	/* Enable discharge if we were previously sourcing 5V */
+	if (prev_en)
+		pd_set_vbus_discharge(port, 1);
+
+	/* Notify host of power info change. */
+	pd_send_host_event(PD_EVENT_POWER_CHANGE);
+}
+
+int pd_check_vconn_swap(int port)
+{
+	/* Allow Vconn swap if AP is on. */
+	return chipset_in_state(CHIPSET_STATE_SUSPEND | CHIPSET_STATE_ON);
+}
+
+int pd_set_power_supply_ready(int port)
+{
+	int rv;
+
+	/* Disable charging. */
+	rv = ppc_vbus_sink_enable(port, 0);
+	if (rv)
+		return rv;
+
+	pd_set_vbus_discharge(port, 0);
+
+	/* Provide Vbus. */
+	rv = ppc_vbus_source_enable(port, 1);
+	if (rv)
+		return rv;
+
+	/* Notify host of power info change. */
+	pd_send_host_event(PD_EVENT_POWER_CHANGE);
+
+	return EC_SUCCESS;
+}
+
+int board_vbus_source_enabled(int port)
+{
+	return ppc_is_sourcing_vbus(port);
+}
+