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 * @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 */ 33 struct 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) 46 int dw_dma_probe(struct dw_dma_chip *chip); 47 int dw_dma_remove(struct dw_dma_chip *chip); 48 #else 49 static inline int dw_dma_probe(struct dw_dma_chip *chip) { return -ENODEV; } 50 static inline int dw_dma_remove(struct dw_dma_chip *chip) { return 0; } 51 #endif /* CONFIG_DW_DMAC_CORE */ 52 53 /* DMA API extensions */ 54 struct dw_desc; 55 56 struct 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 63 struct 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); 66 void dw_dma_cyclic_free(struct dma_chan *chan); 67 int dw_dma_cyclic_start(struct dma_chan *chan); 68 void dw_dma_cyclic_stop(struct dma_chan *chan); 69 70 dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan); 71 72 dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan); 73 74 #endif /* _DMA_DW_H */ 75