1 // SPDX-License-Identifier: GPL-2.0+
3 * COMEDI ISA DMA support functions
4 * Copyright (c) 2014 H Hartley Sweeten <hsweeten@visionengravers.com>
7 #ifndef _COMEDI_ISADMA_H
8 #define _COMEDI_ISADMA_H
10 #include <linux/types.h>
15 * These are used to avoid issues when <asm/dma.h> and the DMA_MODE_
16 * defines are not available.
18 #define COMEDI_ISADMA_READ 0
19 #define COMEDI_ISADMA_WRITE 1
22 * struct comedi_isadma_desc - cookie for ISA DMA
23 * @virt_addr: virtual address of buffer
24 * @hw_addr: hardware (bus) address of buffer
26 * @maxsize: allocated size of buffer (in bytes)
27 * @size: transfer size (in bytes)
28 * @mode: DMA_MODE_READ or DMA_MODE_WRITE
30 struct comedi_isadma_desc {
40 * struct comedi_isadma - ISA DMA data
41 * @desc: cookie for each DMA buffer
42 * @n_desc: the number of cookies
43 * @cur_dma: the current cookie in use
44 * @chan: the first DMA channel requested
45 * @chan2: the second DMA channel requested
47 struct comedi_isadma {
48 struct comedi_isadma_desc *desc;
55 #if IS_ENABLED(CONFIG_ISA_DMA_API)
57 void comedi_isadma_program(struct comedi_isadma_desc *desc);
58 unsigned int comedi_isadma_disable(unsigned int dma_chan);
59 unsigned int comedi_isadma_disable_on_sample(unsigned int dma_chan,
61 unsigned int comedi_isadma_poll(struct comedi_isadma *dma);
62 void comedi_isadma_set_mode(struct comedi_isadma_desc *desc, char dma_dir);
64 struct comedi_isadma *comedi_isadma_alloc(struct comedi_device *dev,
65 int n_desc, unsigned int dma_chan1,
66 unsigned int dma_chan2,
67 unsigned int maxsize, char dma_dir);
68 void comedi_isadma_free(struct comedi_isadma *dma);
70 #else /* !IS_ENABLED(CONFIG_ISA_DMA_API) */
72 static inline void comedi_isadma_program(struct comedi_isadma_desc *desc)
76 static inline unsigned int comedi_isadma_disable(unsigned int dma_chan)
81 static inline unsigned int
82 comedi_isadma_disable_on_sample(unsigned int dma_chan, unsigned int size)
87 static inline unsigned int comedi_isadma_poll(struct comedi_isadma *dma)
92 static inline void comedi_isadma_set_mode(struct comedi_isadma_desc *desc,
97 static inline struct comedi_isadma *
98 comedi_isadma_alloc(struct comedi_device *dev, int n_desc,
99 unsigned int dma_chan1, unsigned int dma_chan2,
100 unsigned int maxsize, char dma_dir)
105 static inline void comedi_isadma_free(struct comedi_isadma *dma)
109 #endif /* !IS_ENABLED(CONFIG_ISA_DMA_API) */
111 #endif /* #ifndef _COMEDI_ISADMA_H */