1 files changed, 83 insertions, 0 deletions
diff --git a/board/kukui_scp/fd.c b/board/kukui_scp/fd.c
new file mode 100644
index 0000000000..11f27cf945
--- /dev/null
+++ b/board/kukui_scp/fd.c
@@ -0,0 +1,83 @@
+/* Copyright 2018 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 "chip/mt_scp/ipi_chip.h"
+#include "chip/mt_scp/registers.h"
+#include "console.h"
+#include "hooks.h"
+#include "task.h"
+#include "util.h"
+#include "fd.h"
+#include "queue.h"
+#include "queue_policies.h"
+
+#define CPRINTF(format, args...) cprintf(CC_IPI, format, ##args)
+#define CPRINTS(format, args...) cprints(CC_IPI, format, ##args)
+
+/* Forwad declaration. */
+static struct consumer const event_fd_consumer;
+static void event_fd_written(struct consumer const *consumer, size_t count);
+
+static struct queue const fd_queue = QUEUE_DIRECT(4, struct fd_msg,
+						  null_producer,
+						  event_fd_consumer);
+static struct consumer const event_fd_consumer = {
+	.queue = &fd_queue,
+	.ops = &((struct consumer_ops const) {
+		.written = event_fd_written,
+	}),
+};
+
+/* Stub functions only provided by private overlays. */
+// Jerry TODO implement private part and remove this
+#ifndef HAVE_PRIVATE_MT8183
+void fd_ipi_msg_handler(void *data) {}
+#endif
+
+static void event_fd_written(struct consumer const *consumer, size_t count)
+{
+	task_wake(TASK_ID_FD_SERVICE);
+}
+
+static void fd_ipi_handler(int id, void *data, uint32_t len)
+{
+	struct fd_msg rsv_msg;
+
+	if (!len)
+		return;
+
+	rsv_msg.type = IPI_FD_CMD;
+	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(&fd_queue, &rsv_msg))
+		CPRINTS("Could not send fd %d to the queue.", rsv_msg.type);
+}
+DECLARE_IPI(IPI_FD_CMD, fd_ipi_handler, 0);
+
+/* This function renames from fd_service_entry. */
+void fd_service_task(void *u)
+{
+	struct fd_msg rsv_msg;
+	size_t size;
+
+	while (1) {
+		/*
+		 * Queue unit is added in IPI handler, which is in ISR context.
+		 * Disable IRQ to prevent a clobbered queue.
+		 */
+		ipi_disable_irq(SCP_IRQ_IPC0);
+		size = queue_remove_unit(&fd_queue, &rsv_msg);
+		ipi_enable_irq(SCP_IRQ_IPC0);
+
+		if (!size)
+			task_wait_event(-1);
+		else
+			fd_ipi_msg_handler(rsv_msg.msg);
+	}
+}