4 * Copyright (C) 2003, 2004 Paul Mundt
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
10 #ifndef __ASM_SH_DMA_H
11 #define __ASM_SH_DMA_H
14 #include <linux/spinlock.h>
15 #include <linux/wait.h>
16 #include <linux/sched.h>
17 #include <linux/sysdev.h>
19 #include <asm-generic/dma.h>
21 #ifdef CONFIG_NR_DMA_CHANNELS
22 # define MAX_DMA_CHANNELS (CONFIG_NR_DMA_CHANNELS)
24 # define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS)
28 * Read and write modes can mean drastically different things depending on the
29 * channel configuration. Consult your DMAC documentation and module
30 * implementation for further clues.
32 #define DMA_MODE_READ 0x00
33 #define DMA_MODE_WRITE 0x01
34 #define DMA_MODE_MASK 0x01
36 #define DMA_AUTOINIT 0x10
39 * DMAC (dma_info) flags
42 DMAC_CHANNELS_CONFIGURED = 0x01,
43 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */
47 * DMA channel capabilities / flags
50 DMA_CONFIGURED = 0x01,
53 * Transfer end interrupt, inherited from DMAC.
54 * wait_queue used in dma_wait_for_completion.
56 DMA_TEI_CAPABLE = 0x02,
59 extern spinlock_t dma_spin_lock;
64 int (*request)(struct dma_channel *chan);
65 void (*free)(struct dma_channel *chan);
67 int (*get_residue)(struct dma_channel *chan);
68 int (*xfer)(struct dma_channel *chan);
69 int (*configure)(struct dma_channel *chan, unsigned long flags);
70 int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
74 char dev_id[16]; /* unique name per DMAC of channel */
76 unsigned int chan; /* DMAC channel number */
77 unsigned int vchan; /* Virtual channel number */
90 wait_queue_head_t wait_queue;
92 struct sys_device dev;
97 struct platform_device *pdev;
100 unsigned int nr_channels;
104 struct dma_channel *channels;
106 struct list_head list;
107 int first_channel_nr;
108 int first_vchannel_nr;
111 struct dma_chan_caps {
113 const char **caplist;
116 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
118 /* arch/sh/drivers/dma/dma-api.c */
119 extern int dma_xfer(unsigned int chan, unsigned long from,
120 unsigned long to, size_t size, unsigned int mode);
122 #define dma_write(chan, from, to, size) \
123 dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
124 #define dma_write_page(chan, from, to) \
125 dma_write(chan, from, to, PAGE_SIZE)
127 #define dma_read(chan, from, to, size) \
128 dma_xfer(chan, from, to, size, DMA_MODE_READ)
129 #define dma_read_page(chan, from, to) \
130 dma_read(chan, from, to, PAGE_SIZE)
132 extern int request_dma_bycap(const char **dmac, const char **caps,
134 extern int get_dma_residue(unsigned int chan);
135 extern struct dma_info *get_dma_info(unsigned int chan);
136 extern struct dma_channel *get_dma_channel(unsigned int chan);
137 extern void dma_wait_for_completion(unsigned int chan);
138 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
140 extern int register_dmac(struct dma_info *info);
141 extern void unregister_dmac(struct dma_info *info);
142 extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
144 extern int dma_extend(unsigned int chan, unsigned long op, void *param);
145 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
147 /* arch/sh/drivers/dma/dma-sysfs.c */
148 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
149 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
152 extern int isa_dma_bridge_buggy;
154 #define isa_dma_bridge_buggy (0)
157 #endif /* __KERNEL__ */
158 #endif /* __ASM_SH_DMA_H */