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crypto: ccp - Add support for extended PSP mailbox commands

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The PSP mailbox supports a number of extended sub-commands.  These
subcommands are placed in the header of the buffer sent to the mailbox.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mario Limonciello 2023-09-07 13:48:43 -05:00 committed by Herbert Xu
parent 949a0c8dd3
commit 6e17375c47
2 changed files with 45 additions and 0 deletions
drivers/crypto/ccp
psp-dev.cpsp-dev.h

24
drivers/crypto/ccp/psp-dev.c

@ -78,6 +78,30 @@ unlock:
return ret;
}
int psp_extended_mailbox_cmd(struct psp_device *psp, unsigned int timeout_msecs,
struct psp_ext_request *req)
{
unsigned int reg;
int ret;
print_hex_dump_debug("->psp ", DUMP_PREFIX_OFFSET, 16, 2, req,
req->header.payload_size, false);
ret = psp_mailbox_command(psp, PSP_CMD_TEE_EXTENDED_CMD, (void *)req,
timeout_msecs, &reg);
if (ret) {
return ret;
} else if (FIELD_GET(PSP_CMDRESP_STS, reg)) {
req->header.status = FIELD_GET(PSP_CMDRESP_STS, reg);
return -EIO;
}
print_hex_dump_debug("<-psp ", DUMP_PREFIX_OFFSET, 16, 2, req,
req->header.payload_size, false);
return 0;
}
static struct psp_device *psp_alloc_struct(struct sp_device *sp)
{
struct device *dev = sp->dev;

21
drivers/crypto/ccp/psp-dev.h

@ -78,15 +78,36 @@ struct psp_device *psp_get_master_device(void);
* enum psp_cmd - PSP mailbox commands
* @PSP_CMD_TEE_RING_INIT: Initialize TEE ring buffer
* @PSP_CMD_TEE_RING_DESTROY: Destroy TEE ring buffer
* @PSP_CMD_TEE_EXTENDED_CMD: Extended command
* @PSP_CMD_MAX: Maximum command id
*/
enum psp_cmd {
PSP_CMD_TEE_RING_INIT = 1,
PSP_CMD_TEE_RING_DESTROY = 2,
PSP_CMD_TEE_EXTENDED_CMD = 14,
PSP_CMD_MAX = 15,
};
int psp_mailbox_command(struct psp_device *psp, enum psp_cmd cmd, void *cmdbuff,
unsigned int timeout_msecs, unsigned int *cmdresp);
/**
* struct psp_ext_req_buffer_hdr - Structure of the extended command header
* @payload_size: total payload size
* @sub_cmd_id: extended command ID
* @status: status of command execution (out)
*/
struct psp_ext_req_buffer_hdr {
u32 payload_size;
u32 sub_cmd_id;
u32 status;
} __packed;
struct psp_ext_request {
struct psp_ext_req_buffer_hdr header;
void *buf;
} __packed;
int psp_extended_mailbox_cmd(struct psp_device *psp, unsigned int timeout_msecs,
struct psp_ext_request *req);
#endif /* __PSP_DEV_H */