62 строки
1.4 KiB
C
62 строки
1.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright 2018-2020 Broadcom.
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*/
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#ifndef BCM_VK_SG_H
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#define BCM_VK_SG_H
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#include <linux/dma-mapping.h>
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struct bcm_vk_dma {
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/* for userland buffer */
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struct page **pages;
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int nr_pages;
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/* common */
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dma_addr_t handle;
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/*
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* sglist is of the following LE format
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* [U32] num_sg = number of sg addresses (N)
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* [U32] totalsize = totalsize of data being transferred in sglist
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* [U32] size[0] = size of data in address0
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* [U32] addr_l[0] = lower 32-bits of address0
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* [U32] addr_h[0] = higher 32-bits of address0
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* ..
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* [U32] size[N-1] = size of data in addressN-1
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* [U32] addr_l[N-1] = lower 32-bits of addressN-1
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* [U32] addr_h[N-1] = higher 32-bits of addressN-1
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*/
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u32 *sglist;
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#define SGLIST_NUM_SG 0
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#define SGLIST_TOTALSIZE 1
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#define SGLIST_VKDATA_START 2
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int sglen; /* Length (bytes) of sglist */
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int direction;
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};
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struct _vk_data {
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u32 size; /* data size in bytes */
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u64 address; /* Pointer to data */
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} __packed;
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/*
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* Scatter-gather DMA buffer API.
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*
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* These functions provide a simple way to create a page list and a
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* scatter-gather list from userspace address and map the memory
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* for DMA operation.
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*/
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int bcm_vk_sg_alloc(struct device *dev,
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struct bcm_vk_dma *dma,
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int dir,
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struct _vk_data *vkdata,
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int num);
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int bcm_vk_sg_free(struct device *dev, struct bcm_vk_dma *dma, int num,
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int *proc_cnt);
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#endif
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