LXR linux/arch/sh/include/asm/dma.h

   1/*
   2 * include/asm-sh/dma.h
   3 *
   4 * Copyright (C) 2003, 2004  Paul Mundt
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10#ifndef __ASM_SH_DMA_H
  11#define __ASM_SH_DMA_H
  12#ifdef __KERNEL__
  13
  14#include <linux/spinlock.h>
  15#include <linux/wait.h>
  16#include <linux/sched.h>
  17#include <linux/sysdev.h>
  18#include <cpu/dma.h>
  19#include <asm-generic/dma.h>
  20
  21#ifdef CONFIG_NR_DMA_CHANNELS
  22#  define MAX_DMA_CHANNELS      (CONFIG_NR_DMA_CHANNELS)
  23#elif defined(CONFIG_NR_ONCHIP_DMA_CHANNELS)
  24#  define MAX_DMA_CHANNELS      (CONFIG_NR_ONCHIP_DMA_CHANNELS)
  25#else
  26#  define MAX_DMA_CHANNELS      0
  27#endif
  28
  29/*
  30 * Read and write modes can mean drastically different things depending on the
  31 * channel configuration. Consult your DMAC documentation and module
  32 * implementation for further clues.
  33 */
  34#define DMA_MODE_READ           0x00
  35#define DMA_MODE_WRITE          0x01
  36#define DMA_MODE_MASK           0x01
  37
  38#define DMA_AUTOINIT            0x10
  39
  40/*
  41 * DMAC (dma_info) flags
  42 */
  43enum {
  44        DMAC_CHANNELS_CONFIGURED        = 0x01,
  45        DMAC_CHANNELS_TEI_CAPABLE       = 0x02, /* Transfer end interrupt */
  46};
  47
  48/*
  49 * DMA channel capabilities / flags
  50 */
  51enum {
  52        DMA_CONFIGURED                  = 0x01,
  53
  54        /*
  55         * Transfer end interrupt, inherited from DMAC.
  56         * wait_queue used in dma_wait_for_completion.
  57         */
  58        DMA_TEI_CAPABLE                 = 0x02,
  59};
  60
  61extern spinlock_t dma_spin_lock;
  62
  63struct dma_channel;
  64
  65struct dma_ops {
  66        int (*request)(struct dma_channel *chan);
  67        void (*free)(struct dma_channel *chan);
  68
  69        int (*get_residue)(struct dma_channel *chan);
  70        int (*xfer)(struct dma_channel *chan);
  71        int (*configure)(struct dma_channel *chan, unsigned long flags);
  72        int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
  73};
  74
  75struct dma_channel {
  76        char dev_id[16];                /* unique name per DMAC of channel */
  77
  78        unsigned int chan;              /* DMAC channel number */
  79        unsigned int vchan;             /* Virtual channel number */
  80
  81        unsigned int mode;
  82        unsigned int count;
  83
  84        unsigned long sar;
  85        unsigned long dar;
  86
  87        const char **caps;
  88
  89        unsigned long flags;
  90        atomic_t busy;
  91
  92        wait_queue_head_t wait_queue;
  93
  94        struct sys_device dev;
  95        void *priv_data;
  96};
  97
  98struct dma_info {
  99        struct platform_device *pdev;
 100
 101        const char *name;
 102        unsigned int nr_channels;
 103        unsigned long flags;
 104
 105        struct dma_ops *ops;
 106        struct dma_channel *channels;
 107
 108        struct list_head list;
 109        int first_channel_nr;
 110        int first_vchannel_nr;
 111};
 112
 113struct dma_chan_caps {
 114        int ch_num;
 115        const char **caplist;
 116};
 117
 118#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
 119
 120/* arch/sh/drivers/dma/dma-api.c */
 121extern int dma_xfer(unsigned int chan, unsigned long from,
 122                    unsigned long to, size_t size, unsigned int mode);
 123
 124#define dma_write(chan, from, to, size) \
 125        dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
 126#define dma_write_page(chan, from, to)  \
 127        dma_write(chan, from, to, PAGE_SIZE)
 128
 129#define dma_read(chan, from, to, size)  \
 130        dma_xfer(chan, from, to, size, DMA_MODE_READ)
 131#define dma_read_page(chan, from, to)   \
 132        dma_read(chan, from, to, PAGE_SIZE)
 133
 134extern int request_dma_bycap(const char **dmac, const char **caps,
 135                             const char *dev_id);
 136extern int get_dma_residue(unsigned int chan);
 137extern struct dma_info *get_dma_info(unsigned int chan);
 138extern struct dma_channel *get_dma_channel(unsigned int chan);
 139extern void dma_wait_for_completion(unsigned int chan);
 140extern void dma_configure_channel(unsigned int chan, unsigned long flags);
 141
 142extern int register_dmac(struct dma_info *info);
 143extern void unregister_dmac(struct dma_info *info);
 144extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
 145
 146extern int dma_extend(unsigned int chan, unsigned long op, void *param);
 147extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
 148
 149/* arch/sh/drivers/dma/dma-sysfs.c */
 150extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
 151extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
 152
 153#ifdef CONFIG_PCI
 154extern int isa_dma_bridge_buggy;
 155#else
 156#define isa_dma_bridge_buggy    (0)
 157#endif
 158
 159#endif /* __KERNEL__ */
 160#endif /* __ASM_SH_DMA_H */
 161