/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
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/*
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* Copyright (c) 2019 Fuzhou Rockchip Electronics Co., Ltd
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*
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* author:
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* Alpha Lin, alpha.lin@rock-chips.com
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* Randy Li, randy.li@rock-chips.com
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* Ding Wei, leo.ding@rock-chips.com
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*
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*/
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#ifndef __ROCKCHIP_MPP_IOMMU_H__
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#define __ROCKCHIP_MPP_IOMMU_H__
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#include <linux/iommu.h>
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#include <linux/dma-mapping.h>
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struct mpp_dma_buffer {
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/* link to dma session buffer list */
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struct list_head link;
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/* dma session belong */
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struct mpp_dma_session *dma;
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/* DMABUF information */
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struct dma_buf *dmabuf;
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struct dma_buf_attachment *attach;
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struct sg_table *sgt;
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struct sg_table *copy_sgt;
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enum dma_data_direction dir;
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dma_addr_t iova;
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unsigned long size;
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void *vaddr;
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struct kref ref;
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ktime_t last_used;
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/* alloc by device */
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struct device *dev;
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};
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#define MPP_SESSION_MAX_BUFFERS 60
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struct mpp_dma_session {
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/* the buffer used in session */
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struct list_head unused_list;
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struct list_head used_list;
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struct mpp_dma_buffer dma_bufs[MPP_SESSION_MAX_BUFFERS];
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/* the mutex for the above buffer list */
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struct mutex list_mutex;
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/* the max buffer num for the buffer list */
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u32 max_buffers;
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/* the count for the buffer list */
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int buffer_count;
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struct device *dev;
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};
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struct mpp_rk_iommu {
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struct list_head link;
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u32 grf_val;
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int mmu_num;
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u32 base_addr[2];
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void __iomem *bases[2];
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u32 dte_addr;
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u32 is_paged;
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};
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struct mpp_iommu_info {
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struct rw_semaphore rw_sem;
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struct device *dev;
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struct platform_device *pdev;
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struct iommu_domain *domain;
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struct iommu_group *group;
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struct mpp_rk_iommu *iommu;
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iommu_fault_handler_t hdl;
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};
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struct mpp_dma_session *
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mpp_dma_session_create(struct device *dev, u32 max_buffers);
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int mpp_dma_session_destroy(struct mpp_dma_session *dma);
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struct mpp_dma_buffer *
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mpp_dma_alloc(struct device *dev, size_t size);
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int mpp_dma_free(struct mpp_dma_buffer *buffer);
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struct mpp_dma_buffer *
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mpp_dma_import_fd(struct mpp_iommu_info *iommu_info,
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struct mpp_dma_session *dma, int fd);
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int mpp_dma_release(struct mpp_dma_session *dma,
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struct mpp_dma_buffer *buffer);
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int mpp_dma_release_fd(struct mpp_dma_session *dma, int fd);
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int mpp_dma_unmap_kernel(struct mpp_dma_session *dma,
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struct mpp_dma_buffer *buffer);
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int mpp_dma_map_kernel(struct mpp_dma_session *dma,
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struct mpp_dma_buffer *buffer);
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struct mpp_iommu_info *
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mpp_iommu_probe(struct device *dev);
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int mpp_iommu_remove(struct mpp_iommu_info *info);
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int mpp_iommu_attach(struct mpp_iommu_info *info);
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int mpp_iommu_detach(struct mpp_iommu_info *info);
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int mpp_iommu_refresh(struct mpp_iommu_info *info, struct device *dev);
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int mpp_iommu_flush_tlb(struct mpp_iommu_info *info);
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static inline int mpp_iommu_down_read(struct mpp_iommu_info *info)
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{
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if (info)
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down_read(&info->rw_sem);
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return 0;
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}
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static inline int mpp_iommu_up_read(struct mpp_iommu_info *info)
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{
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if (info)
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up_read(&info->rw_sem);
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return 0;
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}
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static inline int mpp_iommu_down_write(struct mpp_iommu_info *info)
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{
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if (info)
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down_write(&info->rw_sem);
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return 0;
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}
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static inline int mpp_iommu_up_write(struct mpp_iommu_info *info)
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{
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if (info)
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up_write(&info->rw_sem);
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return 0;
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}
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#endif
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