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

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  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 */
149 

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