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