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 <asm/cpu/dma.h>
19 /* The maximum address that we can perform a DMA transfer to on this platform */
20 /* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
21 occurrence should be flagged as an error. */
23 /* XXX: This is not applicable to SuperH, just needed for alloc_bootmem */
24 #define MAX_DMA_ADDRESS (PAGE_OFFSET+0x10000000)
26 #ifdef CONFIG_NR_DMA_CHANNELS
27 # define MAX_DMA_CHANNELS (CONFIG_NR_DMA_CHANNELS)
29 # define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS)
33 * Read and write modes can mean drastically different things depending on the
34 * channel configuration. Consult your DMAC documentation and module
35 * implementation for further clues.
37 #define DMA_MODE_READ 0x00
38 #define DMA_MODE_WRITE 0x01
39 #define DMA_MODE_MASK 0x01
41 #define DMA_AUTOINIT 0x10
44 * DMAC (dma_info) flags
47 DMAC_CHANNELS_CONFIGURED = 0x01,
48 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */
52 * DMA channel capabilities / flags
55 DMA_CONFIGURED = 0x01,
58 * Transfer end interrupt, inherited from DMAC.
59 * wait_queue used in dma_wait_for_completion.
61 DMA_TEI_CAPABLE = 0x02,
64 extern spinlock_t dma_spin_lock;
69 int (*request)(struct dma_channel *chan);
70 void (*free)(struct dma_channel *chan);
72 int (*get_residue)(struct dma_channel *chan);
73 int (*xfer)(struct dma_channel *chan);
74 int (*configure)(struct dma_channel *chan, unsigned long flags);
75 int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
79 char dev_id[16]; /* unique name per DMAC of channel */
81 unsigned int chan; /* DMAC channel number */
82 unsigned int vchan; /* Virtual channel number */
95 wait_queue_head_t wait_queue;
97 struct sys_device dev;
102 struct platform_device *pdev;
105 unsigned int nr_channels;
109 struct dma_channel *channels;
111 struct list_head list;
112 int first_channel_nr;
115 struct dma_chan_caps {
117 const char **caplist;
120 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
122 /* arch/sh/drivers/dma/dma-api.c */
123 extern int dma_xfer(unsigned int chan, unsigned long from,
124 unsigned long to, size_t size, unsigned int mode);
126 #define dma_write(chan, from, to, size) \
127 dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
128 #define dma_write_page(chan, from, to) \
129 dma_write(chan, from, to, PAGE_SIZE)
131 #define dma_read(chan, from, to, size) \
132 dma_xfer(chan, from, to, size, DMA_MODE_READ)
133 #define dma_read_page(chan, from, to) \
134 dma_read(chan, from, to, PAGE_SIZE)
136 extern int request_dma_bycap(const char **dmac, const char **caps,
138 extern int request_dma(unsigned int chan, const char *dev_id);
139 extern void free_dma(unsigned int chan);
140 extern int get_dma_residue(unsigned int chan);
141 extern struct dma_info *get_dma_info(unsigned int chan);
142 extern struct dma_channel *get_dma_channel(unsigned int chan);
143 extern void dma_wait_for_completion(unsigned int chan);
144 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
146 extern int register_dmac(struct dma_info *info);
147 extern void unregister_dmac(struct dma_info *info);
148 extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
150 extern int dma_extend(unsigned int chan, unsigned long op, void *param);
151 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
154 /* arch/sh/drivers/dma/dma-sysfs.c */
155 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
156 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
158 #define dma_create_sysfs_file(channel, info) do { } while (0)
159 #define dma_remove_sysfs_file(channel, info) do { } while (0)
163 extern int isa_dma_bridge_buggy;
165 #define isa_dma_bridge_buggy (0)
168 #endif /* __KERNEL__ */
169 #endif /* __ASM_SH_DMA_H */