115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/* 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 <hsweeten@visionengravers.com>
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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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