mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Ian Abbott](/assets/img/avatar_default.png)
Some of the header files in "drivers/comedi/drivers/" are common enough to be useful to out-of-tree comedi driver modules. Using them for out-of-tree module builds is hampered by the headers being outside the "include/" directory so it is desirable to move them. There are about a half a dozen or so Comedi device drivers that use the "comedi_isadma" module to add ISA DMA support. The macros and declarations to use that module are in the "comedi_isadma.h" header file in the comedi "drivers" directory. Move it into "include/linux/comedi/". Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20211117120604.117740-6-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
114 lines
2.8 KiB
C
114 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 */
|