2 * Driver for the Synopsys DesignWare DMA Controller
4 * Copyright (C) 2007 Atmel Corporation
5 * Copyright (C) 2010-2011 ST Microelectronics
6 * Copyright (C) 2014 Intel Corporation
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.
15 #include <linux/clk.h>
16 #include <linux/device.h>
17 #include <linux/dmaengine.h>
19 #include <linux/platform_data/dma-dw.h>
24 * struct dw_dma_chip - representation of DesignWare DMA controller hardware
25 * @dev: struct device of the DMA controller
27 * @regs: memory mapped I/O space
29 * @dw: struct dw_dma that is filed by dw_dma_probe()
30 * @pdata: pointer to platform data
39 const struct dw_dma_platform_data *pdata;
42 /* Export to the platform drivers */
43 #if IS_ENABLED(CONFIG_DW_DMAC_CORE)
44 int dw_dma_probe(struct dw_dma_chip *chip);
45 int dw_dma_remove(struct dw_dma_chip *chip);
47 static inline int dw_dma_probe(struct dw_dma_chip *chip) { return -ENODEV; }
48 static inline int dw_dma_remove(struct dw_dma_chip *chip) { return 0; }
49 #endif /* CONFIG_DW_DMAC_CORE */
51 /* DMA API extensions */
54 struct dw_cyclic_desc {
55 struct dw_desc **desc;
56 unsigned long periods;
57 void (*period_callback)(void *param);
58 void *period_callback_param;
61 struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
62 dma_addr_t buf_addr, size_t buf_len, size_t period_len,
63 enum dma_transfer_direction direction);
64 void dw_dma_cyclic_free(struct dma_chan *chan);
65 int dw_dma_cyclic_start(struct dma_chan *chan);
66 void dw_dma_cyclic_stop(struct dma_chan *chan);
68 dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
70 dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
72 #endif /* _DMA_DW_H */