2a52f6e49e
The driver library functions can be used directly by the compound devices such as ADSP or serial driver where DesignWare DMA IP is privately attached to the main hardware. Instead of creating a new platform device leaf they may call dw_dma_probe() with given struct dw_dma_chip directly and make sure that the main device is DMA capable. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
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* Driver for the Synopsys DesignWare DMA Controller
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*
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* Copyright (C) 2007 Atmel Corporation
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* Copyright (C) 2010-2011 ST Microelectronics
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* Copyright (C) 2014 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _DMA_DW_H
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#define _DMA_DW_H
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/dmaengine.h>
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#include <linux/platform_data/dma-dw.h>
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struct dw_dma;
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/**
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* struct dw_dma_chip - representation of DesignWare DMA controller hardware
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* @dev: struct device of the DMA controller
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* @irq: irq line
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* @regs: memory mapped I/O space
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* @clk: hclk clock
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* @dw: struct dw_dma that is filed by dw_dma_probe()
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*/
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struct dw_dma_chip {
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struct device *dev;
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int irq;
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void __iomem *regs;
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struct clk *clk;
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struct dw_dma *dw;
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};
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/* Export to the platform drivers */
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int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata);
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int dw_dma_remove(struct dw_dma_chip *chip);
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/* DMA API extensions */
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struct dw_desc;
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struct dw_cyclic_desc {
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struct dw_desc **desc;
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unsigned long periods;
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void (*period_callback)(void *param);
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void *period_callback_param;
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};
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struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
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dma_addr_t buf_addr, size_t buf_len, size_t period_len,
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enum dma_transfer_direction direction);
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void dw_dma_cyclic_free(struct dma_chan *chan);
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int dw_dma_cyclic_start(struct dma_chan *chan);
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void dw_dma_cyclic_stop(struct dma_chan *chan);
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dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
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dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
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#endif /* _DMA_DW_H */
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