arch/sh/include/asm/dma.h

   1 /* SPDX-License-Identifier: GPL-2.0
   2  *
   3  * include/asm-sh/dma.h
   4  *
   5  * Copyright (C) 2003, 2004  Paul Mundt
   6  */
   7 #ifndef __ASM_SH_DMA_H
   8 #define __ASM_SH_DMA_H
   9
  10 #include <linux/spinlock.h>
  11 #include <linux/wait.h>
  12 #include <linux/sched.h>
  13 #include <linux/device.h>
  14 #include <asm-generic/dma.h>
  15
  16 /*
  17  * Read and write modes can mean drastically different things depending on the
  18  * channel configuration. Consult your DMAC documentation and module
  19  * implementation for further clues.
  20  */
  21 #define DMA_MODE_READ           0x00
  22 #define DMA_MODE_WRITE          0x01
  23 #define DMA_MODE_MASK           0x01
  24
  25 #define DMA_AUTOINIT            0x10
  26
  27 /*
  28  * DMAC (dma_info) flags
  29  */
  30 enum {
  31         DMAC_CHANNELS_CONFIGURED        = 0x01,
  32         DMAC_CHANNELS_TEI_CAPABLE       = 0x02, /* Transfer end interrupt */
  33 };
  34
  35 /*
  36  * DMA channel capabilities / flags
  37  */
  38 enum {
  39         DMA_CONFIGURED                  = 0x01,
  40
  41         /*
  42          * Transfer end interrupt, inherited from DMAC.
  43          * wait_queue used in dma_wait_for_completion.
  44          */
  45         DMA_TEI_CAPABLE                 = 0x02,
  46 };
  47
  48 extern spinlock_t dma_spin_lock;
  49
  50 struct dma_channel;
  51
  52 struct dma_ops {
  53         int (*request)(struct dma_channel *chan);
  54         void (*free)(struct dma_channel *chan);
  55
  56         int (*get_residue)(struct dma_channel *chan);
  57         int (*xfer)(struct dma_channel *chan);
  58         int (*configure)(struct dma_channel *chan, unsigned long flags);
  59 };
  60
  61 struct dma_channel {
  62         char dev_id[16];                /* unique name per DMAC of channel */
  63
  64         unsigned int chan;              /* DMAC channel number */
  65         unsigned int vchan;             /* Virtual channel number */
  66
  67         unsigned int mode;
  68         unsigned int count;
  69
  70         unsigned long sar;
  71         unsigned long dar;
  72
  73         const char **caps;
  74
  75         unsigned long flags;
  76         atomic_t busy;
  77
  78         wait_queue_head_t wait_queue;
  79
  80         struct device dev;
  81         void *priv_data;
  82 };
  83
  84 struct dma_info {
  85         struct platform_device *pdev;
  86
  87         const char *name;
  88         unsigned int nr_channels;
  89         unsigned long flags;
  90
  91         struct dma_ops *ops;
  92         struct dma_channel *channels;
  93
  94         struct list_head list;
  95         int first_channel_nr;
  96         int first_vchannel_nr;
  97 };
  98
  99 struct dma_chan_caps {
 100         int ch_num;
 101         const char **caplist;
 102 };
 103
 104 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
 105
 106 /* arch/sh/drivers/dma/dma-api.c */
 107 extern int dma_xfer(unsigned int chan, unsigned long from,
 108                     unsigned long to, size_t size, unsigned int mode);
 109
 110 #define dma_write(chan, from, to, size) \
 111         dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
 112 #define dma_write_page(chan, from, to)  \
 113         dma_write(chan, from, to, PAGE_SIZE)
 114
 115 #define dma_read(chan, from, to, size)  \
 116         dma_xfer(chan, from, to, size, DMA_MODE_READ)
 117 #define dma_read_page(chan, from, to)   \
 118         dma_read(chan, from, to, PAGE_SIZE)
 119
 120 extern int get_dma_residue(unsigned int chan);
 121 extern struct dma_info *get_dma_info(unsigned int chan);
 122 extern struct dma_channel *get_dma_channel(unsigned int chan);
 123 extern void dma_wait_for_completion(unsigned int chan);
 124 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
 125
 126 extern int register_dmac(struct dma_info *info);
 127 extern void unregister_dmac(struct dma_info *info);
 128
 129 /* arch/sh/drivers/dma/dma-sysfs.c */
 130 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
 131 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
 132
 133 #endif /* __ASM_SH_DMA_H */