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 21 struct dw_dma; 22 23 /** 24 * struct dw_dma_chip - representation of DesignWare DMA controller hardware 25 * @dev: struct device of the DMA controller 26 * @irq: irq line 27 * @regs: memory mapped I/O space 28 * @clk: hclk clock 29 * @dw: struct dw_dma that is filed by dw_dma_probe() 30 */ 31 struct dw_dma_chip { 32 struct device *dev; 33 int irq; 34 void __iomem *regs; 35 struct clk *clk; 36 struct dw_dma *dw; 37 }; 38 39 /* Export to the platform drivers */ 40 int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata); 41 int dw_dma_remove(struct dw_dma_chip *chip); 42 43 /* DMA API extensions */ 44 struct dw_desc; 45 46 struct dw_cyclic_desc { 47 struct dw_desc **desc; 48 unsigned long periods; 49 void (*period_callback)(void *param); 50 void *period_callback_param; 51 }; 52 53 struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan, 54 dma_addr_t buf_addr, size_t buf_len, size_t period_len, 55 enum dma_transfer_direction direction); 56 void dw_dma_cyclic_free(struct dma_chan *chan); 57 int dw_dma_cyclic_start(struct dma_chan *chan); 58 void dw_dma_cyclic_stop(struct dma_chan *chan); 59 60 dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan); 61 62 dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan); 63 64 #endif /* _DMA_DW_H */ 65