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comedi_isadma.h

/* 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 */

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docroot: /var/www/469ed2f6-4d4b-4a8a-9f5e-ee4ef04d3bc8/public_html

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curdir: /usr/src/linux-headers-6.8.0-117/include/linux/comedi

	.		4096
	..		69632
X	comedi_8254.h		5201
X	comedi_8255.h		1416
X	comedi_isadma.h		2835
X	comedi_pci.h		1850
X	comedi_pcmcia.h		1675
X	comedi_usb.h		1476
X	comedidev.h		42202
X	comedilib.h		932