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 * @pdata: pointer to platform data 31 */ 32 struct dw_dma_chip { 33 struct device *dev; 34 int irq; 35 void __iomem *regs; 36 struct clk *clk; 37 struct dw_dma *dw; 38 39 const struct dw_dma_platform_data *pdata; 40 }; 41 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); 46 #else 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 */ 50 51 /* DMA API extensions */ 52 struct dw_desc; 53 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; 59 }; 60 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); 67 68 dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan); 69 70 dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan); 71 72 #endif /* _DMA_DW_H */ 73