mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 09:41:44 +00:00
151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/*
|
|
* include/asm-sh/dma.h
|
|
*
|
|
* Copyright (C) 2003, 2004 Paul Mundt
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#ifndef __ASM_SH_DMA_H
|
|
#define __ASM_SH_DMA_H
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/sysdev.h>
|
|
#include <linux/device.h>
|
|
#include <asm/cpu/dma.h>
|
|
#include <asm/semaphore.h>
|
|
|
|
/* The maximum address that we can perform a DMA transfer to on this platform */
|
|
/* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
|
|
occurrence should be flagged as an error. */
|
|
/* But... */
|
|
/* XXX: This is not applicable to SuperH, just needed for alloc_bootmem */
|
|
#define MAX_DMA_ADDRESS (PAGE_OFFSET+0x10000000)
|
|
|
|
#ifdef CONFIG_NR_DMA_CHANNELS
|
|
# define MAX_DMA_CHANNELS (CONFIG_NR_DMA_CHANNELS)
|
|
#else
|
|
# define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS)
|
|
#endif
|
|
|
|
/*
|
|
* 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_CONFIGURED = 0x00,
|
|
DMAC_CHANNELS_TEI_CAPABLE = 0x01,
|
|
};
|
|
|
|
/*
|
|
* DMA channel capabilities / flags
|
|
*/
|
|
enum {
|
|
DMA_TEI_CAPABLE = 0x01,
|
|
DMA_CONFIGURED = 0x02,
|
|
};
|
|
|
|
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);
|
|
void (*configure)(struct dma_channel *chan, unsigned long flags);
|
|
};
|
|
|
|
struct dma_channel {
|
|
char dev_id[16];
|
|
|
|
unsigned int chan; /* Physical channel number */
|
|
unsigned int vchan; /* Virtual channel number */
|
|
unsigned int mode;
|
|
unsigned int count;
|
|
|
|
unsigned long sar;
|
|
unsigned long dar;
|
|
|
|
unsigned long flags;
|
|
atomic_t busy;
|
|
|
|
struct semaphore sem;
|
|
wait_queue_head_t wait_queue;
|
|
|
|
struct sys_device dev;
|
|
};
|
|
|
|
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;
|
|
};
|
|
|
|
#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(unsigned int chan, const char *dev_id);
|
|
extern void free_dma(unsigned int chan);
|
|
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);
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
/* 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 *);
|
|
#else
|
|
#define dma_create_sysfs_file(channel, info) do { } while (0)
|
|
#define dma_remove_sysfs_file(channel, info) do { } while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_PCI
|
|
extern int isa_dma_bridge_buggy;
|
|
#else
|
|
#define isa_dma_bridge_buggy (0)
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_SH_DMA_H */
|