Linux kernel mirror (for testing)
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linux
1/*
2 * Driver for the Synopsys DesignWare DMA Controller
3 *
4 * Copyright (C) 2007 Atmel Corporation
5 * Copyright (C) 2010-2011 ST Microelectronics
6 * Copyright (C) 2014 Intel Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#ifndef _DMA_DW_H
13#define _DMA_DW_H
14
15#include <linux/clk.h>
16#include <linux/device.h>
17#include <linux/dmaengine.h>
18
19#include <linux/platform_data/dma-dw.h>
20
21struct dw_dma;
22
23/**
24 * struct dw_dma_chip - representation of DesignWare DMA controller hardware
25 * @dev: struct device of the DMA controller
26 * @id: instance ID
27 * @irq: irq line
28 * @regs: memory mapped I/O space
29 * @clk: hclk clock
30 * @dw: struct dw_dma that is filed by dw_dma_probe()
31 * @pdata: pointer to platform data
32 */
33struct dw_dma_chip {
34 struct device *dev;
35 int id;
36 int irq;
37 void __iomem *regs;
38 struct clk *clk;
39 struct dw_dma *dw;
40
41 const struct dw_dma_platform_data *pdata;
42};
43
44/* Export to the platform drivers */
45#if IS_ENABLED(CONFIG_DW_DMAC_CORE)
46int dw_dma_probe(struct dw_dma_chip *chip);
47int dw_dma_remove(struct dw_dma_chip *chip);
48#else
49static inline int dw_dma_probe(struct dw_dma_chip *chip) { return -ENODEV; }
50static inline int dw_dma_remove(struct dw_dma_chip *chip) { return 0; }
51#endif /* CONFIG_DW_DMAC_CORE */
52
53/* DMA API extensions */
54struct dw_desc;
55
56struct dw_cyclic_desc {
57 struct dw_desc **desc;
58 unsigned long periods;
59 void (*period_callback)(void *param);
60 void *period_callback_param;
61};
62
63struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
64 dma_addr_t buf_addr, size_t buf_len, size_t period_len,
65 enum dma_transfer_direction direction);
66void dw_dma_cyclic_free(struct dma_chan *chan);
67int dw_dma_cyclic_start(struct dma_chan *chan);
68void dw_dma_cyclic_stop(struct dma_chan *chan);
69
70dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
71
72dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
73
74#endif /* _DMA_DW_H */