root/arch/sh/include/asm/dma.h

INCLUDED FROM

   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 #ifdef __KERNEL__
  10 
  11 #include <linux/spinlock.h>
  12 #include <linux/wait.h>
  13 #include <linux/sched.h>
  14 #include <linux/device.h>
  15 #include <asm-generic/dma.h>
  16 
  17 /*
  18  * Read and write modes can mean drastically different things depending on the
  19  * channel configuration. Consult your DMAC documentation and module
  20  * implementation for further clues.
  21  */
  22 #define DMA_MODE_READ           0x00
  23 #define DMA_MODE_WRITE          0x01
  24 #define DMA_MODE_MASK           0x01
  25 
  26 #define DMA_AUTOINIT            0x10
  27 
  28 /*
  29  * DMAC (dma_info) flags
  30  */
  31 enum {
  32         DMAC_CHANNELS_CONFIGURED        = 0x01,
  33         DMAC_CHANNELS_TEI_CAPABLE       = 0x02, /* Transfer end interrupt */
  34 };
  35 
  36 /*
  37  * DMA channel capabilities / flags
  38  */
  39 enum {
  40         DMA_CONFIGURED                  = 0x01,
  41 
  42         /*
  43          * Transfer end interrupt, inherited from DMAC.
  44          * wait_queue used in dma_wait_for_completion.
  45          */
  46         DMA_TEI_CAPABLE                 = 0x02,
  47 };
  48 
  49 extern spinlock_t dma_spin_lock;
  50 
  51 struct dma_channel;
  52 
  53 struct dma_ops {
  54         int (*request)(struct dma_channel *chan);
  55         void (*free)(struct dma_channel *chan);
  56 
  57         int (*get_residue)(struct dma_channel *chan);
  58         int (*xfer)(struct dma_channel *chan);
  59         int (*configure)(struct dma_channel *chan, unsigned long flags);
  60         int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
  61 };
  62 
  63 struct dma_channel {
  64         char dev_id[16];                /* unique name per DMAC of channel */
  65 
  66         unsigned int chan;              /* DMAC channel number */
  67         unsigned int vchan;             /* Virtual channel number */
  68 
  69         unsigned int mode;
  70         unsigned int count;
  71 
  72         unsigned long sar;
  73         unsigned long dar;
  74 
  75         const char **caps;
  76 
  77         unsigned long flags;
  78         atomic_t busy;
  79 
  80         wait_queue_head_t wait_queue;
  81 
  82         struct device dev;
  83         void *priv_data;
  84 };
  85 
  86 struct dma_info {
  87         struct platform_device *pdev;
  88 
  89         const char *name;
  90         unsigned int nr_channels;
  91         unsigned long flags;
  92 
  93         struct dma_ops *ops;
  94         struct dma_channel *channels;
  95 
  96         struct list_head list;
  97         int first_channel_nr;
  98         int first_vchannel_nr;
  99 };
 100 
 101 struct dma_chan_caps {
 102         int ch_num;
 103         const char **caplist;
 104 };
 105 
 106 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
 107 
 108 /* arch/sh/drivers/dma/dma-api.c */
 109 extern int dma_xfer(unsigned int chan, unsigned long from,
 110                     unsigned long to, size_t size, unsigned int mode);
 111 
 112 #define dma_write(chan, from, to, size) \
 113         dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
 114 #define dma_write_page(chan, from, to)  \
 115         dma_write(chan, from, to, PAGE_SIZE)
 116 
 117 #define dma_read(chan, from, to, size)  \
 118         dma_xfer(chan, from, to, size, DMA_MODE_READ)
 119 #define dma_read_page(chan, from, to)   \
 120         dma_read(chan, from, to, PAGE_SIZE)
 121 
 122 extern int request_dma_bycap(const char **dmac, const char **caps,
 123                              const char *dev_id);
 124 extern int get_dma_residue(unsigned int chan);
 125 extern struct dma_info *get_dma_info(unsigned int chan);
 126 extern struct dma_channel *get_dma_channel(unsigned int chan);
 127 extern void dma_wait_for_completion(unsigned int chan);
 128 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
 129 
 130 extern int register_dmac(struct dma_info *info);
 131 extern void unregister_dmac(struct dma_info *info);
 132 extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
 133 
 134 extern int dma_extend(unsigned int chan, unsigned long op, void *param);
 135 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
 136 
 137 /* arch/sh/drivers/dma/dma-sysfs.c */
 138 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
 139 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
 140 
 141 #ifdef CONFIG_PCI
 142 extern int isa_dma_bridge_buggy;
 143 #else
 144 #define isa_dma_bridge_buggy    (0)
 145 #endif
 146 
 147 #endif /* __KERNEL__ */
 148 #endif /* __ASM_SH_DMA_H */