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Currently the PSP semaphore communication base address is discovered by using an MSR that is not architecturally guaranteed for future platforms. Also the mailbox that is utilized for communication with the PSP may have other consumers in the kernel, so it's better to make all communication go through a single driver. Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Reviewed-by: Mark Hasemeyer <markhas@chromium.org> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Tested-by: Mark Hasemeyer <markhas@chromium.org> Acked-by: Wolfram Sang <wsa@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/* 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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