mailbox: add PolarFire SoC mailbox driver

This driver adds support for the single mailbox channel of the MSS
system controller on the Microchip PolarFire SoC.

Signed-off-by: Jamie Gibbons <[email protected]>
Acked-by: Leo Yu-Chi Liang <[email protected]>

1 files changed, 66 insertions, 0 deletions

diff --git a/include/mpfs-mailbox.h b/include/mpfs-mailbox.h
new file mode 100644
index 00000000000..c0ff327a4ce
--- /dev/null
+++ b/include/mpfs-mailbox.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *
+ * Microchip PolarFire SoC (MPFS)
+ *
+ * Copyright (c) 2020 Microchip Corporation. All rights reserved.
+ *
+ *
+ */
+
+#ifndef _MPFS_MAILBOX_H__
+#define _MPFS_MAILBOX_H__
+
+#include <linux/types.h>
+
+#define BYTES_4 4
+
+struct udevice;
+
+/**
+ * struct mpfs_mss_msg - PolarFire SoC message structure
+ * @cmd_opcode:	Command opcode
+ * @cmd_data_size:	Size of the command data.
+ * @response:	Pointer to the response data.
+ * @cmd_data:	Pointer to the command data.
+ * @mbox_offset:	Mailbox offset
+ * @resp_offset:	Response offset
+ *
+ */
+struct mpfs_mss_msg {
+	u8 cmd_opcode;
+	u16 cmd_data_size;
+	struct mpfs_mss_response *response;
+	u8 *cmd_data;
+	u16 mbox_offset;
+	u16 resp_offset;
+};
+
+/**
+ * struct mpfs_mss_response - PolarFire SoC response structure
+ * @resp_status:	Response status
+ * @resp_msg:	Pointer to response message.
+ * @resp_size:	Size of the response message.
+ *
+ */
+struct mpfs_mss_response {
+	u32 resp_status;
+	u32 *resp_msg;
+	u16 resp_size;
+};
+
+struct mpfs_syscontroller_priv;
+
+struct mpfs_sys_serv {
+	struct udevice *dev;
+	struct mpfs_syscontroller_priv *sys_controller;
+	struct mpfs_mss_msg *msg;
+};
+
+int mpfs_syscontroller_run_service(struct mpfs_syscontroller_priv *sys_controller, struct mpfs_mss_msg *msg);
+int mpfs_syscontroller_read_sernum(struct mpfs_sys_serv *sys_serv_priv, u8 *device_serial_number);
+void mpfs_syscontroller_process_dtbo(struct mpfs_sys_serv *sys_serv_priv);
+struct mpfs_syscontroller_priv *mpfs_syscontroller_get(struct udevice *dev);
+
+#endif /* __MPFS_MAILBOX_H__ */
+