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/sysdev.h>
17 #include <linux/device.h>
18 #include <asm/cpu/dma.h>
19 #include <asm/semaphore.h>
21 /* The maximum address that we can perform a DMA transfer to on this platform */
22 /* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
23 occurrence should be flagged as an error. */
25 /* XXX: This is not applicable to SuperH, just needed for alloc_bootmem */
26 #define MAX_DMA_ADDRESS (PAGE_OFFSET+0x10000000)
28 #ifdef CONFIG_NR_DMA_CHANNELS
29 # define MAX_DMA_CHANNELS (CONFIG_NR_DMA_CHANNELS)
31 # define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS)
35 * Read and write modes can mean drastically different things depending on the
36 * channel configuration. Consult your DMAC documentation and module
37 * implementation for further clues.
39 #define DMA_MODE_READ 0x00
40 #define DMA_MODE_WRITE 0x01
41 #define DMA_MODE_MASK 0x01
43 #define DMA_AUTOINIT 0x10
46 * DMAC (dma_info) flags
49 DMAC_CHANNELS_CONFIGURED = 0x00,
50 DMAC_CHANNELS_TEI_CAPABLE = 0x01,
54 * DMA channel capabilities / flags
57 DMA_TEI_CAPABLE = 0x01,
58 DMA_CONFIGURED = 0x02,
61 extern spinlock_t dma_spin_lock;
66 int (*request)(struct dma_channel *chan);
67 void (*free)(struct dma_channel *chan);
69 int (*get_residue)(struct dma_channel *chan);
70 int (*xfer)(struct dma_channel *chan);
71 void (*configure)(struct dma_channel *chan, unsigned long flags);
77 unsigned int chan; /* Physical channel number */
78 unsigned int vchan; /* Virtual channel number */
89 wait_queue_head_t wait_queue;
91 struct sys_device dev;
95 struct platform_device *pdev;
98 unsigned int nr_channels;
102 struct dma_channel *channels;
104 struct list_head list;
107 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
109 /* arch/sh/drivers/dma/dma-api.c */
110 extern int dma_xfer(unsigned int chan, unsigned long from,
111 unsigned long to, size_t size, unsigned int mode);
113 #define dma_write(chan, from, to, size) \
114 dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
115 #define dma_write_page(chan, from, to) \
116 dma_write(chan, from, to, PAGE_SIZE)
118 #define dma_read(chan, from, to, size) \
119 dma_xfer(chan, from, to, size, DMA_MODE_READ)
120 #define dma_read_page(chan, from, to) \
121 dma_read(chan, from, to, PAGE_SIZE)
123 extern int request_dma(unsigned int chan, const char *dev_id);
124 extern void free_dma(unsigned int chan);
125 extern int get_dma_residue(unsigned int chan);
126 extern struct dma_info *get_dma_info(unsigned int chan);
127 extern struct dma_channel *get_dma_channel(unsigned int chan);
128 extern void dma_wait_for_completion(unsigned int chan);
129 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
131 extern int register_dmac(struct dma_info *info);
132 extern void unregister_dmac(struct dma_info *info);
135 /* arch/sh/drivers/dma/dma-sysfs.c */
136 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
137 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
139 #define dma_create_sysfs_file(channel, info) do { } while (0)
140 #define dma_remove_sysfs_file(channel, info) do { } while (0)
144 extern int isa_dma_bridge_buggy;
146 #define isa_dma_bridge_buggy (0)
149 #endif /* __KERNEL__ */
150 #endif /* __ASM_SH_DMA_H */