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114 lines
2.8 KiB
114 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* |
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* COMEDI ISA DMA support functions |
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* Copyright (c) 2014 H Hartley Sweeten <[email protected]> |
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*/ |
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#ifndef _COMEDI_ISADMA_H |
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#define _COMEDI_ISADMA_H |
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#include <linux/types.h> |
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struct comedi_device; |
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struct device; |
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/* |
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* These are used to avoid issues when <asm/dma.h> and the DMA_MODE_ |
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* defines are not available. |
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*/ |
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#define COMEDI_ISADMA_READ 0 |
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#define COMEDI_ISADMA_WRITE 1 |
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/** |
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* struct comedi_isadma_desc - cookie for ISA DMA |
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* @virt_addr: virtual address of buffer |
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* @hw_addr: hardware (bus) address of buffer |
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* @chan: DMA channel |
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* @maxsize: allocated size of buffer (in bytes) |
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* @size: transfer size (in bytes) |
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* @mode: DMA_MODE_READ or DMA_MODE_WRITE |
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*/ |
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struct comedi_isadma_desc { |
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void *virt_addr; |
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dma_addr_t hw_addr; |
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unsigned int chan; |
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unsigned int maxsize; |
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unsigned int size; |
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char mode; |
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}; |
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/** |
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* struct comedi_isadma - ISA DMA data |
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* @dev: device to allocate non-coherent memory for |
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* @desc: cookie for each DMA buffer |
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* @n_desc: the number of cookies |
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* @cur_dma: the current cookie in use |
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* @chan: the first DMA channel requested |
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* @chan2: the second DMA channel requested |
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*/ |
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struct comedi_isadma { |
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struct device *dev; |
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struct comedi_isadma_desc *desc; |
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int n_desc; |
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int cur_dma; |
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unsigned int chan; |
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unsigned int chan2; |
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}; |
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#if IS_ENABLED(CONFIG_ISA_DMA_API) |
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void comedi_isadma_program(struct comedi_isadma_desc *desc); |
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unsigned int comedi_isadma_disable(unsigned int dma_chan); |
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unsigned int comedi_isadma_disable_on_sample(unsigned int dma_chan, |
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unsigned int size); |
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unsigned int comedi_isadma_poll(struct comedi_isadma *dma); |
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void comedi_isadma_set_mode(struct comedi_isadma_desc *desc, char dma_dir); |
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struct comedi_isadma *comedi_isadma_alloc(struct comedi_device *dev, |
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int n_desc, unsigned int dma_chan1, |
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unsigned int dma_chan2, |
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unsigned int maxsize, char dma_dir); |
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void comedi_isadma_free(struct comedi_isadma *dma); |
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#else /* !IS_ENABLED(CONFIG_ISA_DMA_API) */ |
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static inline void comedi_isadma_program(struct comedi_isadma_desc *desc) |
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{ |
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} |
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static inline unsigned int comedi_isadma_disable(unsigned int dma_chan) |
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{ |
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return 0; |
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} |
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static inline unsigned int |
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comedi_isadma_disable_on_sample(unsigned int dma_chan, unsigned int size) |
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{ |
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return 0; |
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} |
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static inline unsigned int comedi_isadma_poll(struct comedi_isadma *dma) |
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{ |
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return 0; |
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} |
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static inline void comedi_isadma_set_mode(struct comedi_isadma_desc *desc, |
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char dma_dir) |
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{ |
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} |
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static inline struct comedi_isadma * |
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comedi_isadma_alloc(struct comedi_device *dev, int n_desc, |
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unsigned int dma_chan1, unsigned int dma_chan2, |
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unsigned int maxsize, char dma_dir) |
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{ |
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return NULL; |
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} |
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static inline void comedi_isadma_free(struct comedi_isadma *dma) |
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{ |
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} |
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#endif /* !IS_ENABLED(CONFIG_ISA_DMA_API) */ |
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#endif /* #ifndef _COMEDI_ISADMA_H */
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