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
13 #include <linux/config.h>
14 #include <linux/spinlock.h>
15 #include <linux/wait.h>
16 #include <linux/sysdev.h>
17 #include <asm/cpu/dma.h>
18 #include <asm/semaphore.h>
20 /* The maximum address that we can perform a DMA transfer to on this platform */
21 /* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
22 occurrence should be flagged as an error. */
24 /* XXX: This is not applicable to SuperH, just needed for alloc_bootmem */
25 #define MAX_DMA_ADDRESS (PAGE_OFFSET+0x10000000)
27 #ifdef CONFIG_NR_DMA_CHANNELS
28 # define MAX_DMA_CHANNELS (CONFIG_NR_DMA_CHANNELS)
30 # define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS)
34 * Read and write modes can mean drastically different things depending on the
35 * channel configuration. Consult your DMAC documentation and module
36 * implementation for further clues.
38 #define DMA_MODE_READ 0x00
39 #define DMA_MODE_WRITE 0x01
40 #define DMA_MODE_MASK 0x01
42 #define DMA_AUTOINIT 0x10
45 * DMAC (dma_info) flags
48 DMAC_CHANNELS_CONFIGURED = 0x00,
49 DMAC_CHANNELS_TEI_CAPABLE = 0x01,
53 * DMA channel capabilities / flags
56 DMA_CONFIGURED = 0x00,
57 DMA_TEI_CAPABLE = 0x01,
60 extern spinlock_t dma_spin_lock;
65 int (*request)(struct dma_channel *chan);
66 void (*free)(struct dma_channel *chan);
68 int (*get_residue)(struct dma_channel *chan);
69 int (*xfer)(struct dma_channel *chan);
70 void (*configure)(struct dma_channel *chan, unsigned long flags);
87 wait_queue_head_t wait_queue;
89 struct sys_device dev;
94 unsigned int nr_channels;
98 struct dma_channel *channels;
100 struct list_head list;
103 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
105 /* arch/sh/drivers/dma/dma-api.c */
106 extern int dma_xfer(unsigned int chan, unsigned long from,
107 unsigned long to, size_t size, unsigned int mode);
109 #define dma_write(chan, from, to, size) \
110 dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
111 #define dma_write_page(chan, from, to) \
112 dma_write(chan, from, to, PAGE_SIZE)
114 #define dma_read(chan, from, to, size) \
115 dma_xfer(chan, from, to, size, DMA_MODE_READ)
116 #define dma_read_page(chan, from, to) \
117 dma_read(chan, from, to, PAGE_SIZE)
119 extern int request_dma(unsigned int chan, const char *dev_id);
120 extern void free_dma(unsigned int chan);
121 extern int get_dma_residue(unsigned int chan);
122 extern struct dma_info *get_dma_info(unsigned int chan);
123 extern struct dma_channel *get_dma_channel(unsigned int chan);
124 extern void dma_wait_for_completion(unsigned int chan);
125 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
127 extern int register_dmac(struct dma_info *info);
128 extern void unregister_dmac(struct dma_info *info);
131 /* arch/sh/drivers/dma/dma-sysfs.c */
132 extern int dma_create_sysfs_files(struct dma_channel *);
136 extern int isa_dma_bridge_buggy;
138 #define isa_dma_bridge_buggy (0)
141 #endif /* __ASM_SH_DMA_H */