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