include/linux/psp-platform-access.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef __PSP_PLATFORM_ACCESS_H
   4 #define __PSP_PLATFORM_ACCESS_H
   5
   6 #include <linux/psp.h>
   7
   8 enum psp_platform_access_msg {
   9         PSP_CMD_NONE                    = 0x0,
  10         PSP_CMD_HSTI_QUERY              = 0x14,
  11         PSP_I2C_REQ_BUS_CMD             = 0x64,
  12         PSP_DYNAMIC_BOOST_GET_NONCE,
  13         PSP_DYNAMIC_BOOST_SET_UID,
  14         PSP_DYNAMIC_BOOST_GET_PARAMETER,
  15         PSP_DYNAMIC_BOOST_SET_PARAMETER,
  16 };
  17
  18 struct psp_req_buffer_hdr {
  19         u32 payload_size;
  20         u32 status;
  21 } __packed;
  22
  23 struct psp_request {
  24         struct psp_req_buffer_hdr header;
  25         void *buf;
  26 } __packed;
  27
  28 /**
  29  * psp_send_platform_access_msg() - Send a message to control platform features
  30  *
  31  * This function is intended to be used by drivers outside of ccp to communicate
  32  * with the platform.
  33  *
  34  * Returns:
  35  *  0:           success
  36  *  -%EBUSY:     mailbox in recovery or in use
  37  *  -%ENODEV:    driver not bound with PSP device
  38  *  -%ETIMEDOUT: request timed out
  39  *  -%EIO:       unknown error (see kernel log)
  40  */
  41 int psp_send_platform_access_msg(enum psp_platform_access_msg, struct psp_request *req);
  42
  43 /**
  44  * psp_ring_platform_doorbell() - Ring platform doorbell
  45  *
  46  * This function is intended to be used by drivers outside of ccp to ring the
  47  * platform doorbell with a message.
  48  *
  49  * Returns:
  50  *  0:           success
  51  *  -%EBUSY:     mailbox in recovery or in use
  52  *  -%ENODEV:    driver not bound with PSP device
  53  *  -%ETIMEDOUT: request timed out
  54  *  -%EIO:       error will be stored in result argument
  55  */
  56 int psp_ring_platform_doorbell(int msg, u32 *result);
  57
  58 /**
  59  * psp_check_platform_access_status() - Checks whether platform features is ready
  60  *
  61  * This function is intended to be used by drivers outside of ccp to determine
  62  * if platform features has initialized.
  63  *
  64  * Returns:
  65  * 0          platform features is ready
  66  * -%ENODEV   platform features is not ready or present
  67  */
  68 int psp_check_platform_access_status(void);
  69
  70 #endif /* __PSP_PLATFORM_ACCESS_H */