1 /* SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2003, 2004 Paul Mundt
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>
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.
21 #define DMA_MODE_READ 0x00
22 #define DMA_MODE_WRITE 0x01
23 #define DMA_MODE_MASK 0x01
25 #define DMA_AUTOINIT 0x10
28 * DMAC (dma_info) flags
31 DMAC_CHANNELS_CONFIGURED = 0x01,
32 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */
36 * DMA channel capabilities / flags
39 DMA_CONFIGURED = 0x01,
42 * Transfer end interrupt, inherited from DMAC.
43 * wait_queue used in dma_wait_for_completion.
45 DMA_TEI_CAPABLE = 0x02,
48 extern spinlock_t dma_spin_lock;
53 int (*request)(struct dma_channel *chan);
54 void (*free)(struct dma_channel *chan);
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 int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
63 char dev_id[16]; /* unique name per DMAC of channel */
65 unsigned int chan; /* DMAC channel number */
66 unsigned int vchan; /* Virtual channel number */
79 wait_queue_head_t wait_queue;
86 struct platform_device *pdev;
89 unsigned int nr_channels;
93 struct dma_channel *channels;
95 struct list_head list;
97 int first_vchannel_nr;
100 struct dma_chan_caps {
102 const char **caplist;
105 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
107 /* arch/sh/drivers/dma/dma-api.c */
108 extern int dma_xfer(unsigned int chan, unsigned long from,
109 unsigned long to, size_t size, unsigned int mode);
111 #define dma_write(chan, from, to, size) \
112 dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
113 #define dma_write_page(chan, from, to) \
114 dma_write(chan, from, to, PAGE_SIZE)
116 #define dma_read(chan, from, to, size) \
117 dma_xfer(chan, from, to, size, DMA_MODE_READ)
118 #define dma_read_page(chan, from, to) \
119 dma_read(chan, from, to, PAGE_SIZE)
121 extern int request_dma_bycap(const char **dmac, const char **caps,
123 extern int get_dma_residue(unsigned int chan);
124 extern struct dma_info *get_dma_info(unsigned int chan);
125 extern struct dma_channel *get_dma_channel(unsigned int chan);
126 extern void dma_wait_for_completion(unsigned int chan);
127 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
129 extern int register_dmac(struct dma_info *info);
130 extern void unregister_dmac(struct dma_info *info);
131 extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
133 extern int dma_extend(unsigned int chan, unsigned long op, void *param);
134 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
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 *);
141 extern int isa_dma_bridge_buggy;
143 #define isa_dma_bridge_buggy (0)
146 #endif /* __ASM_SH_DMA_H */