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/* SPDX-License-Identifier: GPL-2.0 */
/*
* GXP MicroController Unit firmware management.
*
* Copyright (C) 2022 Google LLC
*/
#ifndef __GXP_MCU_FIRMWARE_H__
#define __GXP_MCU_FIRMWARE_H__
#include <linux/mutex.h>
#include <gcip/gcip-firmware.h>
#include <gcip/gcip-image-config.h>
#include "gxp-internal.h"
#define MCU_SIGNATURE_SIZE 0x1000
#define MCU_SIGNATURE_HEADER_OFFSET 0x400
/* The offset from top of the signed MCU firmware to the image config data. */
#define MCU_IMAGE_CONFIG_OFFSET 0x560
struct gxp_mcu_firmware {
struct gxp_dev *gxp;
/* resource for MCU firmware image */
struct gxp_mapped_resource image_buf;
struct mutex lock; /* lock to protect fields below */
enum gcip_fw_status status;
struct gcip_fw_info fw_info;
struct gcip_image_config_parser cfg_parser;
const char *name; /* the firmware name last loaded */
bool is_signed;
};
/*
* Initializes @mcu_fw.
*
* Returns 0 on success, a negative errno on failure.
*/
int gxp_mcu_firmware_init(struct gxp_dev *gxp, struct gxp_mcu_firmware *mcu_fw);
/* cleans up resources in @mcu_fw */
void gxp_mcu_firmware_exit(struct gxp_mcu_firmware *mcu_fw);
/*
* Loads and runs the MCU firmware. The firmware is ready to serve when this
* call succeeds.
*
* Returns 0 on success, a negative errno on failure.
*/
int gxp_mcu_firmware_run(struct gxp_mcu_firmware *mcu_fw);
/*
* Stops the running MCU firmware.
*/
void gxp_mcu_firmware_stop(struct gxp_mcu_firmware *mcu_fw);
/*
* Returns the pointer of MCU firmware associated with the GXP device object.
*
* This function is NOT implemented in gxp-mcu-firmware.c. Instead, it shall be
* implemented in *-platform.c as a chip-dependent implementation.
*
* It's okay to not implement this function for chips without MCU support,
* because in this case this function will never be used.
*/
struct gxp_mcu_firmware *gxp_mcu_firmware_of(struct gxp_dev *gxp);
#endif /* __GXP_MCU_FIRMWARE_H__ */
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