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  */
  41 enum {
  42         DMAC_CHANNELS_CONFIGURED        = 0x01,
  43         DMAC_CHANNELS_TEI_CAPABLE       = 0x02, /* Transfer end interrupt */
  44 };
  45
  46 /*
  47  * DMA channel capabilities / flags
  48  */
  49 enum {
  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
  59 extern spinlock_t dma_spin_lock;
  60
  61 struct dma_channel;
  62
  63 struct 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
  73 struct 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
  96 struct 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
 111 struct 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 */
 119 extern 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
 132 extern int request_dma_bycap(const char **dmac, const char **caps,
 133                              const char *dev_id);
 134 extern int get_dma_residue(unsigned int chan);
 135 extern struct dma_info *get_dma_info(unsigned int chan);
 136 extern struct dma_channel *get_dma_channel(unsigned int chan);
 137 extern void dma_wait_for_completion(unsigned int chan);
 138 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
 139
 140 extern int register_dmac(struct dma_info *info);
 141 extern void unregister_dmac(struct dma_info *info);
 142 extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
 143
 144 extern int dma_extend(unsigned int chan, unsigned long op, void *param);
 145 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
 146
 147 /* arch/sh/drivers/dma/dma-sysfs.c */
 148 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
 149 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
 150
 151 #ifdef CONFIG_PCI
 152 extern 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 */