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240720e905
This change implements a mailbox transport using SMT format for SCMI exchanges. This implementation follows the Linux kernel and SCP-firmware [1] as references implementation for SCMI message processing using SMT format for communication channel meta-data. Use of mailboxes in SCMI FDT bindings are defined in the Linux kernel DT bindings since v4.17. Links: [1] https://github.com/ARM-software/SCP-firmware Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org> Cc: Simon Glass <sjg@chromium.org> Cc: Peng Fan <peng.fan@nxp.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Reviewed-by: Simon Glass <sjg@chromium.org>
87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved.
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* Copyright (C) 2019-2020 Linaro Limited.
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*/
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#ifndef SCMI_SMT_H
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#define SCMI_SMT_H
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#include <asm/types.h>
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/**
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* struct scmi_smt_header - Description of the shared memory message buffer
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*
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* SMT stands for Shared Memory based Transport.
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* SMT uses 28 byte header prior message payload to handle the state of
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* the communication channel realized by the shared memory area and
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* to define SCMI protocol information the payload relates to.
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*/
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struct scmi_smt_header {
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__le32 reserved;
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__le32 channel_status;
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#define SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR BIT(1)
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#define SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE BIT(0)
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__le32 reserved1[2];
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__le32 flags;
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#define SCMI_SHMEM_FLAG_INTR_ENABLED BIT(0)
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__le32 length;
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__le32 msg_header;
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u8 msg_payload[0];
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};
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#define SMT_HEADER_TOKEN(token) (((token) << 18) & GENMASK(31, 18))
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#define SMT_HEADER_PROTOCOL_ID(proto) (((proto) << 10) & GENMASK(17, 10))
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#define SMT_HEADER_MESSAGE_TYPE(type) (((type) << 18) & GENMASK(9, 8))
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#define SMT_HEADER_MESSAGE_ID(id) ((id) & GENMASK(7, 0))
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/**
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* struct scmi_smt - Description of a SMT memory buffer
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* @buf: Shared memory base address
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* @size: Shared memory byte size
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*/
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struct scmi_smt {
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u8 *buf;
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size_t size;
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};
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static inline bool scmi_smt_channel_is_free(struct scmi_smt *smt)
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{
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struct scmi_smt_header *hdr = (void *)smt->buf;
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return hdr->channel_status & SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE;
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}
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static inline bool scmi_smt_channel_reports_error(struct scmi_smt *smt)
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{
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struct scmi_smt_header *hdr = (void *)smt->buf;
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return hdr->channel_status & SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR;
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}
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static inline void scmi_smt_get_channel(struct scmi_smt *smt)
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{
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struct scmi_smt_header *hdr = (void *)smt->buf;
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hdr->channel_status &= ~SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE;
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}
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static inline void scmi_smt_put_channel(struct scmi_smt *smt)
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{
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struct scmi_smt_header *hdr = (void *)smt->buf;
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hdr->channel_status |= SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE;
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hdr->channel_status &= ~SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR;
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}
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int scmi_dt_get_smt_buffer(struct udevice *dev, struct scmi_smt *smt);
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int scmi_write_msg_to_smt(struct udevice *dev, struct scmi_smt *smt,
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struct scmi_msg *msg);
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int scmi_read_resp_from_smt(struct udevice *dev, struct scmi_smt *smt,
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struct scmi_msg *msg);
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void scmi_clear_smt_channel(struct scmi_smt *smt);
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#endif /* SCMI_SMT_H */
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