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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __PSP_PLATFORM_ACCESS_H
#define __PSP_PLATFORM_ACCESS_H
#include <linux/psp.h>
enum psp_platform_access_msg {
PSP_CMD_NONE = 0x0,
PSP_I2C_REQ_BUS_CMD = 0x64,
PSP_DYNAMIC_BOOST_GET_NONCE,
};
struct psp_req_buffer_hdr {
u32 payload_size;
u32 status;
} __packed;
struct psp_request {
struct psp_req_buffer_hdr header;
void *buf;
} __packed;
/**
* psp_send_platform_access_msg() - Send a message to control platform features
*
* This function is intended to be used by drivers outside of ccp to communicate
* with the platform.
*
* Returns:
* 0: success
* -%EBUSY: mailbox in recovery or in use
* -%ENODEV: driver not bound with PSP device
* -%ETIMEDOUT: request timed out
* -%EIO: unknown error (see kernel log)
*/
int psp_send_platform_access_msg(enum psp_platform_access_msg, struct psp_request *req);
/**
* psp_ring_platform_doorbell() - Ring platform doorbell
*
* This function is intended to be used by drivers outside of ccp to ring the
* platform doorbell with a message.
*
* Returns:
* 0: success
* -%EBUSY: mailbox in recovery or in use
* -%ENODEV: driver not bound with PSP device
* -%ETIMEDOUT: request timed out
* -%EIO: error will be stored in result argument
*/
int psp_ring_platform_doorbell(int msg, u32 *result);
/**
* psp_check_platform_access_status() - Checks whether platform features is ready
*
* This function is intended to be used by drivers outside of ccp to determine
* if platform features has initialized.
*
* Returns:
* 0 platform features is ready
* -%ENODEV platform features is not ready or present
*/
int psp_check_platform_access_status(void);
#endif /* __PSP_PLATFORM_ACCESS_H */
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