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