/* * Driver for the Synopsys DesignWare DMA Controller * * Copyright (C) 2007 Atmel Corporation * Copyright (C) 2010-2011 ST Microelectronics * Copyright (C) 2014 Intel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef _DMA_DW_H #define _DMA_DW_H #include <linux/clk.h> #include <linux/device.h> #include <linux/dmaengine.h> #include <linux/platform_data/dma-dw.h> struct dw_dma; /** * struct dw_dma_chip - representation of DesignWare DMA controller hardware * @dev: struct device of the DMA controller * @irq: irq line * @regs: memory mapped I/O space * @clk: hclk clock * @dw: struct dw_dma that is filed by dw_dma_probe() * @pdata: pointer to platform data */ struct dw_dma_chip { struct device *dev; int irq; void __iomem *regs; struct clk *clk; struct dw_dma *dw; const struct dw_dma_platform_data *pdata; }; /* Export to the platform drivers */ #if IS_ENABLED([31mCONFIG_DW_DMAC_CORE[0m) int dw_dma_probe(struct dw_dma_chip *chip); int dw_dma_remove(struct dw_dma_chip *chip); #else static inline int dw_dma_probe(struct dw_dma_chip *chip) { return -ENODEV; } static inline int dw_dma_remove(struct dw_dma_chip *chip) { return 0; } #endif /* CONFIG_DW_DMAC_CORE */ /* DMA API extensions */ struct dw_desc; struct dw_cyclic_desc { struct dw_desc **desc; unsigned long periods; void (*period_callback)(void *param); void *period_callback_param; }; struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, size_t period_len, enum dma_transfer_direction direction); void dw_dma_cyclic_free(struct dma_chan *chan); int dw_dma_cyclic_start(struct dma_chan *chan); void dw_dma_cyclic_stop(struct dma_chan *chan); dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan); dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan); #endif /* _DMA_DW_H */ |