linux/include/asm-sh/dma.h
Adrian McMenamin eb695dbf00 sh: Fix Dreamcast DMA issues.
The current SH DMA API is somewhat broken, not correctly matching
virtual channel to the correct SH DMAC. This wasn't noticeable when
using g2 DMA for the sound driver - one channel 0 is as good as any
other! - but caused the pvr2 driver to fail.

This patch fixes the pvr2 problem and consequently fixes the sound
driver to ensure it continues to function.

Signed-off by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-07-24 13:30:55 +09:00

171 lines
4.5 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/sched.h>
#include <linux/sysdev.h>
#include <asm/cpu/dma.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 = 0x01,
DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */
};
/*
* DMA channel capabilities / flags
*/
enum {
DMA_CONFIGURED = 0x01,
/*
* Transfer end interrupt, inherited from DMAC.
* wait_queue used in dma_wait_for_completion.
*/
DMA_TEI_CAPABLE = 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);
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 sys_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 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);
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);
#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 */