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/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef __CSS_SCMI_PRIVATE_H__
#define __CSS_SCMI_PRIVATE_H__
/*
* SCMI power domain management protocol message and response lengths. It is
* calculated as sum of length in bytes of the message header (4) and payload
* area (the number of bytes of parameters or return values in the payload).
*/
#define SCMI_PROTO_VERSION_MSG_LEN 4
#define SCMI_PROTO_VERSION_RESP_LEN 12
#define SCMI_PROTO_MSG_ATTR_MSG_LEN 8
#define SCMI_PROTO_MSG_ATTR_RESP_LEN 12
#define SCMI_PWR_STATE_SET_MSG_LEN 16
#define SCMI_PWR_STATE_SET_RESP_LEN 8
#define SCMI_PWR_STATE_GET_MSG_LEN 8
#define SCMI_PWR_STATE_GET_RESP_LEN 12
#define SCMI_SYS_PWR_STATE_SET_MSG_LEN 12
#define SCMI_SYS_PWR_STATE_SET_RESP_LEN 8
#define SCMI_SYS_PWR_STATE_GET_MSG_LEN 4
#define SCMI_SYS_PWR_STATE_GET_RESP_LEN 12
/* SCMI message header format bit field */
#define SCMI_MSG_ID_SHIFT 0
#define SCMI_MSG_ID_WIDTH 8
#define SCMI_MSG_ID_MASK ((1 << SCMI_MSG_ID_WIDTH) - 1)
#define SCMI_MSG_TYPE_SHIFT 8
#define SCMI_MSG_TYPE_WIDTH 2
#define SCMI_MSG_TYPE_MASK ((1 << SCMI_MSG_TYPE_WIDTH) - 1)
#define SCMI_MSG_PROTO_ID_SHIFT 10
#define SCMI_MSG_PROTO_ID_WIDTH 8
#define SCMI_MSG_PROTO_ID_MASK ((1 << SCMI_MSG_PROTO_ID_WIDTH) - 1)
#define SCMI_MSG_TOKEN_SHIFT 18
#define SCMI_MSG_TOKEN_WIDTH 10
#define SCMI_MSG_TOKEN_MASK ((1 << SCMI_MSG_TOKEN_WIDTH) - 1)
/* SCMI mailbox flags */
#define SCMI_FLAG_RESP_POLL 0
#define SCMI_FLAG_RESP_INT 1
/* SCMI power domain protocol `POWER_STATE_SET` message flags */
#define SCMI_PWR_STATE_SET_FLAG_SYNC 0
#define SCMI_PWR_STATE_SET_FLAG_ASYNC 1
/*
* Helper macro to create an SCMI message header given protocol, message id
* and token.
*/
#define SCMI_MSG_CREATE(protocol, msg_id, token) \
((((protocol) & SCMI_MSG_PROTO_ID_MASK) << SCMI_MSG_PROTO_ID_SHIFT) | \
(((msg_id) & SCMI_MSG_ID_MASK) << SCMI_MSG_ID_SHIFT) | \
(((token) & SCMI_MSG_TOKEN_MASK) << SCMI_MSG_TOKEN_SHIFT))
/* Helper macro to get the token from a SCMI message header */
#define SCMI_MSG_GET_TOKEN(msg) \
(((msg) >> SCMI_MSG_TOKEN_SHIFT) & SCMI_MSG_TOKEN_MASK)
/* SCMI Channel Status bit fields */
#define SCMI_CH_STATUS_RES0_MASK 0xFFFFFFFE
#define SCMI_CH_STATUS_FREE_SHIFT 0
#define SCMI_CH_STATUS_FREE_WIDTH 1
#define SCMI_CH_STATUS_FREE_MASK ((1 << SCMI_CH_STATUS_FREE_WIDTH) - 1)
/* Helper macros to check and write the channel status */
#define SCMI_IS_CHANNEL_FREE(status) \
(!!(((status) >> SCMI_CH_STATUS_FREE_SHIFT) & SCMI_CH_STATUS_FREE_MASK))
#define SCMI_MARK_CHANNEL_BUSY(status) do { \
assert(SCMI_IS_CHANNEL_FREE(status)); \
(status) &= ~(SCMI_CH_STATUS_FREE_MASK << \
SCMI_CH_STATUS_FREE_SHIFT); \
} while (0)
/* Helper macros to copy arguments to the mailbox payload */
#define SCMI_PAYLOAD_ARG1(payld_arr, arg1) \
mmio_write_32((uintptr_t)&payld_arr[0], arg1)
#define SCMI_PAYLOAD_ARG2(payld_arr, arg1, arg2) do { \
SCMI_PAYLOAD_ARG1(payld_arr, arg1); \
mmio_write_32((uintptr_t)&payld_arr[1], arg2); \
} while (0)
#define SCMI_PAYLOAD_ARG3(payld_arr, arg1, arg2, arg3) do { \
SCMI_PAYLOAD_ARG2(payld_arr, arg1, arg2); \
mmio_write_32((uintptr_t)&payld_arr[2], arg3); \
} while (0)
/* Helper macros to read return values from the mailbox payload */
#define SCMI_PAYLOAD_RET_VAL1(payld_arr, val1) \
(val1) = mmio_read_32((uintptr_t)&payld_arr[0])
#define SCMI_PAYLOAD_RET_VAL2(payld_arr, val1, val2) do { \
SCMI_PAYLOAD_RET_VAL1(payld_arr, val1); \
(val2) = mmio_read_32((uintptr_t)&payld_arr[1]); \
} while (0)
#define SCMI_PAYLOAD_RET_VAL3(payld_arr, val1, val2, val3) do { \
SCMI_PAYLOAD_RET_VAL2(payld_arr, val1, val2); \
(val3) = mmio_read_32((uintptr_t)&payld_arr[2]); \
} while (0)
/* Helper macro to ring doorbell */
#define SCMI_RING_DOORBELL(addr, modify_mask, preserve_mask) do { \
uint32_t db = mmio_read_32(addr) & (preserve_mask); \
mmio_write_32(addr, db | (modify_mask)); \
} while (0)
/*
* Private data structure for representing the mailbox memory layout. Refer
* the SCMI specification for more details.
*/
typedef struct mailbox_mem {
uint32_t res_a; /* Reserved */
volatile uint32_t status;
uint64_t res_b; /* Reserved */
uint32_t flags;
volatile uint32_t len;
uint32_t msg_header;
uint32_t payload[];
} mailbox_mem_t;
/* Private APIs for use within SCMI driver */
void scmi_get_channel(scmi_channel_t *ch);
void scmi_send_sync_command(scmi_channel_t *ch);
void scmi_put_channel(scmi_channel_t *ch);
static inline void validate_scmi_channel(scmi_channel_t *ch)
{
assert(ch && ch->is_initialized);
assert(ch->info && ch->info->scmi_mbx_mem);
}
#endif /* __CSS_SCMI_PRIVATE_H__ */
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