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/* SPDX-License-Identifier: GPL-2.0
* include/asm-sh/dma.h
* Copyright (C) 2003, 2004 Paul Mundt
#ifndef __ASM_SH_DMA_H
#define __ASM_SH_DMA_H
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/device.h>
#include <asm-generic/dma.h>
* Read and write modes can mean drastically different things depending on the
* channel configuration. Consult your DMAC documentation and module
* implementation for further clues.
#define DMA_MODE_READ 0x00
#define DMA_MODE_WRITE 0x01
#define DMA_MODE_MASK 0x01
#define DMA_AUTOINIT 0x10
* DMAC (dma_info) flags
enum {
DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */
* DMA channel capabilities / flags
enum {
* Transfer end interrupt, inherited from DMAC.
* wait_queue used in dma_wait_for_completion.
extern spinlock_t dma_spin_lock;
struct dma_channel;
struct dma_ops {
int (*request)(struct dma_channel *chan);
void (*free)(struct dma_channel *chan);
int (*get_residue)(struct dma_channel *chan);
int (*xfer)(struct dma_channel *chan);
int (*configure)(struct dma_channel *chan, unsigned long flags);
int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
struct dma_channel {
char dev_id[16]; /* unique name per DMAC of channel */
unsigned int chan; /* DMAC channel number */
unsigned int vchan; /* Virtual channel number */
unsigned int mode;
unsigned int count;
unsigned long sar;
unsigned long dar;
const char **caps;
unsigned long flags;
atomic_t busy;
wait_queue_head_t wait_queue;
struct device dev;
void *priv_data;
struct dma_info {
struct platform_device *pdev;
const char *name;
unsigned int nr_channels;
unsigned long flags;
struct dma_ops *ops;
struct dma_channel *channels;
struct list_head list;
int first_channel_nr;
int first_vchannel_nr;
struct dma_chan_caps {
int ch_num;
const char **caplist;
#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
/* arch/sh/drivers/dma/dma-api.c */
extern int dma_xfer(unsigned int chan, unsigned long from,
unsigned long to, size_t size, unsigned int mode);
#define dma_write(chan, from, to, size) \
dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
#define dma_write_page(chan, from, to) \
dma_write(chan, from, to, PAGE_SIZE)
#define dma_read(chan, from, to, size) \
dma_xfer(chan, from, to, size, DMA_MODE_READ)
#define dma_read_page(chan, from, to) \
dma_read(chan, from, to, PAGE_SIZE)
extern int request_dma_bycap(const char **dmac, const char **caps,
const char *dev_id);
extern int get_dma_residue(unsigned int chan);
extern struct dma_info *get_dma_info(unsigned int chan);
extern struct dma_channel *get_dma_channel(unsigned int chan);
extern void dma_wait_for_completion(unsigned int chan);
extern void dma_configure_channel(unsigned int chan, unsigned long flags);
extern int register_dmac(struct dma_info *info);
extern void unregister_dmac(struct dma_info *info);
extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
extern int dma_extend(unsigned int chan, unsigned long op, void *param);
extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
/* arch/sh/drivers/dma/dma-sysfs.c */
extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
extern int isa_dma_bridge_buggy;
#define isa_dma_bridge_buggy (0)
#endif /* __ASM_SH_DMA_H */