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  */
  43 enum {
  44         DMAC_CHANNELS_CONFIGURED        = 0x01,
  45         DMAC_CHANNELS_TEI_CAPABLE       = 0x02, /* Transfer end interrupt */
  46 };
  47
  48 /*
  49  * DMA channel capabilities / flags
  50  */
  51 enum {
  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
  61 extern spinlock_t dma_spin_lock;
  62
  63 struct dma_channel;
  64
  65 struct 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
  75 struct 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
  98 struct 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
 113 struct 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 */
 121 extern 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
 134 extern int request_dma_bycap(const char **dmac, const char **caps,
 135                              const char *dev_id);
 136 extern int get_dma_residue(unsigned int chan);
 137 extern struct dma_info *get_dma_info(unsigned int chan);
 138 extern struct dma_channel *get_dma_channel(unsigned int chan);
 139 extern void dma_wait_for_completion(unsigned int chan);
 140 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
 141
 142 extern int register_dmac(struct dma_info *info);
 143 extern void unregister_dmac(struct dma_info *info);
 144 extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
 145
 146 extern int dma_extend(unsigned int chan, unsigned long op, void *param);
 147 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
 148
 149 /* arch/sh/drivers/dma/dma-sysfs.c */
 150 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
 151 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
 152
 153 #ifdef CONFIG_PCI
 154 extern 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 */