1 files changed, 81 insertions, 0 deletions
diff --git a/baseboard/mtscp-rv32i/mdp.c b/baseboard/mtscp-rv32i/mdp.c
new file mode 100644
index 0000000000..44b7df714e
--- /dev/null
+++ b/baseboard/mtscp-rv32i/mdp.c
@@ -0,0 +1,81 @@
+/* Copyright 2021 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 "console.h"
+#include "ipi_chip.h"
+#include "mdp.h"
+#include "queue_policies.h"
+#include "registers.h"
+#include "task.h"
+#include "util.h"
+
+#define CPRINTF(format, args...) cprintf(CC_IPI, format, ##args)
+#define CPRINTS(format, args...) cprints(CC_IPI, format, ##args)
+
+static void event_mdp_written(struct consumer const *consumer, size_t count)
+{
+	task_wake(TASK_ID_MDP_SERVICE);
+}
+static struct consumer const event_mdp_consumer;
+static struct queue const event_mdp_queue = QUEUE_DIRECT(4,
+	struct mdp_msg_service, null_producer, event_mdp_consumer);
+static struct consumer const event_mdp_consumer = {
+	.queue = &event_mdp_queue,
+	.ops = &((struct consumer_ops const) {
+		.written = event_mdp_written,
+	}),
+};
+
+/* Stub functions only provided by private overlays. */
+#ifndef HAVE_PRIVATE_MT8192
+void mdp_common_init(void) {}
+void mdp_ipi_task_handler(void *pvParameters) {}
+#endif
+
+static void mdp_ipi_handler(int id, void *data, unsigned int len)
+{
+	struct mdp_msg_service rsv_msg;
+
+	if (!len) {
+		CPRINTS("len is zero.");
+		return;
+	}
+
+	rsv_msg.id = id;
+	memcpy(rsv_msg.msg, data, MIN(len, sizeof(rsv_msg.msg)));
+
+	/*
+	 * If there is no other IPI handler touch this queue, we don't need to
+	 * interrupt_disable() or task_disable_irq().
+	 */
+	if (!queue_add_unit(&event_mdp_queue, &rsv_msg))
+		CPRINTS("Could not send mdp id: %d to the queue.", id);
+}
+DECLARE_IPI(SCP_IPI_MDP_INIT, mdp_ipi_handler, 0);
+DECLARE_IPI(SCP_IPI_MDP_FRAME, mdp_ipi_handler, 0);
+DECLARE_IPI(SCP_IPI_MDP_DEINIT, mdp_ipi_handler, 0);
+
+void mdp_service_task(void *u)
+{
+	struct mdp_msg_service rsv_msg;
+	size_t size;
+
+	mdp_common_init();
+
+	while (1) {
+		/*
+		 * Queue unit is added in IPI handler, which is in ISR context.
+		 * Disable IRQ to prevent a clobbered queue.
+		 */
+		ipi_disable_irq();
+		size = queue_remove_unit(&event_mdp_queue, &rsv_msg);
+		ipi_enable_irq();
+
+		if (!size)
+			task_wait_event(-1);
+		else
+			mdp_ipi_task_handler(&rsv_msg);
+	}
+}