include/asm-sh/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/config.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/wait.h>
  17 #include <linux/sysdev.h>
  18 #include <linux/device.h>
  19 #include <asm/cpu/dma.h>
  20 #include <asm/semaphore.h>
  21
  22 /* The maximum address that we can perform a DMA transfer to on this platform */
  23 /* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
  24    occurrence should be flagged as an error.  */
  25 /* But... */
  26 /* XXX: This is not applicable to SuperH, just needed for alloc_bootmem */
  27 #define MAX_DMA_ADDRESS         (PAGE_OFFSET+0x10000000)
  28
  29 #ifdef CONFIG_NR_DMA_CHANNELS
  30 #  define MAX_DMA_CHANNELS      (CONFIG_NR_DMA_CHANNELS)
  31 #else
  32 #  define MAX_DMA_CHANNELS      (CONFIG_NR_ONCHIP_DMA_CHANNELS)
  33 #endif
  34
  35 /*
  36  * Read and write modes can mean drastically different things depending on the
  37  * channel configuration. Consult your DMAC documentation and module
  38  * implementation for further clues.
  39  */
  40 #define DMA_MODE_READ           0x00
  41 #define DMA_MODE_WRITE          0x01
  42 #define DMA_MODE_MASK           0x01
  43
  44 #define DMA_AUTOINIT            0x10
  45
  46 /*
  47  * DMAC (dma_info) flags
  48  */
  49 enum {
  50         DMAC_CHANNELS_CONFIGURED        = 0x00,
  51         DMAC_CHANNELS_TEI_CAPABLE       = 0x01,
  52 };
  53
  54 /*
  55  * DMA channel capabilities / flags
  56  */
  57 enum {
  58         DMA_TEI_CAPABLE                 = 0x01,
  59         DMA_CONFIGURED                  = 0x02,
  60 };
  61
  62 extern spinlock_t dma_spin_lock;
  63
  64 struct dma_channel;
  65
  66 struct dma_ops {
  67         int (*request)(struct dma_channel *chan);
  68         void (*free)(struct dma_channel *chan);
  69
  70         int (*get_residue)(struct dma_channel *chan);
  71         int (*xfer)(struct dma_channel *chan);
  72         void (*configure)(struct dma_channel *chan, unsigned long flags);
  73 };
  74
  75 struct dma_channel {
  76         char dev_id[16];
  77
  78         unsigned int chan;              /* Physical channel number */
  79         unsigned int vchan;             /* Virtual channel number */
  80         unsigned int mode;
  81         unsigned int count;
  82
  83         unsigned long sar;
  84         unsigned long dar;
  85
  86         unsigned long flags;
  87         atomic_t busy;
  88
  89         struct semaphore sem;
  90         wait_queue_head_t wait_queue;
  91
  92         struct sys_device dev;
  93 };
  94
  95 struct dma_info {
  96         struct platform_device *pdev;
  97
  98         const char *name;
  99         unsigned int nr_channels;
 100         unsigned long flags;
 101
 102         struct dma_ops *ops;
 103         struct dma_channel *channels;
 104
 105         struct list_head list;
 106 };
 107
 108 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
 109
 110 /* arch/sh/drivers/dma/dma-api.c */
 111 extern int dma_xfer(unsigned int chan, unsigned long from,
 112                     unsigned long to, size_t size, unsigned int mode);
 113
 114 #define dma_write(chan, from, to, size) \
 115         dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
 116 #define dma_write_page(chan, from, to)  \
 117         dma_write(chan, from, to, PAGE_SIZE)
 118
 119 #define dma_read(chan, from, to, size)  \
 120         dma_xfer(chan, from, to, size, DMA_MODE_READ)
 121 #define dma_read_page(chan, from, to)   \
 122         dma_read(chan, from, to, PAGE_SIZE)
 123
 124 extern int request_dma(unsigned int chan, const char *dev_id);
 125 extern void free_dma(unsigned int chan);
 126 extern int get_dma_residue(unsigned int chan);
 127 extern struct dma_info *get_dma_info(unsigned int chan);
 128 extern struct dma_channel *get_dma_channel(unsigned int chan);
 129 extern void dma_wait_for_completion(unsigned int chan);
 130 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
 131
 132 extern int register_dmac(struct dma_info *info);
 133 extern void unregister_dmac(struct dma_info *info);
 134
 135 #ifdef CONFIG_SYSFS
 136 /* arch/sh/drivers/dma/dma-sysfs.c */
 137 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
 138 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
 139 #else
 140 #define dma_create_sysfs_file(channel, info)            do { } while (0)
 141 #define dma_remove_sysfs_file(channel, info)            do { } while (0)
 142 #endif
 143
 144 #ifdef CONFIG_PCI
 145 extern int isa_dma_bridge_buggy;
 146 #else
 147 #define isa_dma_bridge_buggy    (0)
 148 #endif
 149
 150 #endif /* __KERNEL__ */
 151 #endif /* __ASM_SH_DMA_H */