87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved.
|
|
* Copyright (C) 2019-2020 Linaro Limited.
|
|
*/
|
|
#ifndef SCMI_SMT_H
|
|
#define SCMI_SMT_H
|
|
|
|
#include <asm/types.h>
|
|
|
|
/**
|
|
* struct scmi_smt_header - Description of the shared memory message buffer
|
|
*
|
|
* SMT stands for Shared Memory based Transport.
|
|
* SMT uses 28 byte header prior message payload to handle the state of
|
|
* the communication channel realized by the shared memory area and
|
|
* to define SCMI protocol information the payload relates to.
|
|
*/
|
|
struct scmi_smt_header {
|
|
__le32 reserved;
|
|
__le32 channel_status;
|
|
#define SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR BIT(1)
|
|
#define SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE BIT(0)
|
|
__le32 reserved1[2];
|
|
__le32 flags;
|
|
#define SCMI_SHMEM_FLAG_INTR_ENABLED BIT(0)
|
|
__le32 length;
|
|
__le32 msg_header;
|
|
u8 msg_payload[0];
|
|
};
|
|
|
|
#define SMT_HEADER_TOKEN(token) (((token) << 18) & GENMASK(31, 18))
|
|
#define SMT_HEADER_PROTOCOL_ID(proto) (((proto) << 10) & GENMASK(17, 10))
|
|
#define SMT_HEADER_MESSAGE_TYPE(type) (((type) << 18) & GENMASK(9, 8))
|
|
#define SMT_HEADER_MESSAGE_ID(id) ((id) & GENMASK(7, 0))
|
|
|
|
/**
|
|
* struct scmi_smt - Description of a SMT memory buffer
|
|
* @buf: Shared memory base address
|
|
* @size: Shared memory byte size
|
|
*/
|
|
struct scmi_smt {
|
|
u8 *buf;
|
|
size_t size;
|
|
};
|
|
|
|
static inline bool scmi_smt_channel_is_free(struct scmi_smt *smt)
|
|
{
|
|
struct scmi_smt_header *hdr = (void *)smt->buf;
|
|
|
|
return hdr->channel_status & SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE;
|
|
}
|
|
|
|
static inline bool scmi_smt_channel_reports_error(struct scmi_smt *smt)
|
|
{
|
|
struct scmi_smt_header *hdr = (void *)smt->buf;
|
|
|
|
return hdr->channel_status & SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR;
|
|
}
|
|
|
|
static inline void scmi_smt_get_channel(struct scmi_smt *smt)
|
|
{
|
|
struct scmi_smt_header *hdr = (void *)smt->buf;
|
|
|
|
hdr->channel_status &= ~SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE;
|
|
}
|
|
|
|
static inline void scmi_smt_put_channel(struct scmi_smt *smt)
|
|
{
|
|
struct scmi_smt_header *hdr = (void *)smt->buf;
|
|
|
|
hdr->channel_status |= SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE;
|
|
hdr->channel_status &= ~SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR;
|
|
}
|
|
|
|
int scmi_dt_get_smt_buffer(struct udevice *dev, struct scmi_smt *smt);
|
|
|
|
int scmi_write_msg_to_smt(struct udevice *dev, struct scmi_smt *smt,
|
|
struct scmi_msg *msg);
|
|
|
|
int scmi_read_resp_from_smt(struct udevice *dev, struct scmi_smt *smt,
|
|
struct scmi_msg *msg);
|
|
|
|
void scmi_clear_smt_channel(struct scmi_smt *smt);
|
|
|
|
#endif /* SCMI_SMT_H */
|