/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2022 Rockchip Electronics Co., Ltd.
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*/
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#ifndef ROCKCHIP_RPMSG_H
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#define ROCKCHIP_RPMSG_H
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/* rpmsg flag bit definition
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* bit 0: Set 1 to indicate remote processor is ready
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* bit 1: Set 1 to use reserved memory region as shared DMA pool
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* bit 2: Set 1 to use cached share memory as vring buffer
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*/
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#define RPMSG_REMOTE_IS_READY BIT(0)
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#define RPMSG_SHARED_DMA_POOL BIT(1)
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#define RPMSG_CACHED_VRING BIT(2)
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#define RPMSG_VIRTIO_RPMSG_F_NS BIT(0)
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#define RPMSG_BUF_PAYLOAD_SIZE (496UL)
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/* rpmsg buffer size is formed by payload size and struct rpmsg_hdr */
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#define RPMSG_BUF_SIZE (RPMSG_BUF_PAYLOAD_SIZE + 16UL)
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/* rpmsg buffer count for each direction */
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#define RPMSG_BUF_COUNT (64UL)
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/* rpmsg endpoint size is equal to rpmsg buffer size */
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#define RPMSG_EPT_SIZE RPMSG_BUF_SIZE
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#define RPMSG_MAX_INSTANCE_NUM (12U)
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#define RPMSG_MAX_LINK_ID (0xFFU)
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#define RPMSG_MBOX_MAGIC (0x524D5347U)
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/* Linux requires the ALIGN to 0x1000(4KB) */
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#define RPMSG_VRING_ALIGN (0x1000UL)
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/* contains pool of descriptors and two circular buffers */
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#define RPMSG_VRING_SIZE (0x8000UL)
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/* size of 2 * RPMSG_VRING_SIZE */
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#define RPMSG_VRING_OVERHEAD (2UL * RPMSG_VRING_SIZE)
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/* link_id: 4 bit master cpu_id and 4 bit remote_id */
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#define RPMSG_GET_M_CPU_ID(link_id) (((link_id) & 0xF0U) >> 4U)
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#define RPMSG_GET_R_CPU_ID(link_id) ((link_id) & 0xFU)
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#endif /* ROCKCHIP_RPMSG_H */
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