fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-sh / dma.h
bloba65b02fd186ef4ec2bf2976846c4bdcd6b9f2201
1 /*
2 * include/asm-sh/dma.h
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
8 * for more details.
9 */
10 #ifndef __ASM_SH_DMA_H
11 #define __ASM_SH_DMA_H
12 #ifdef __KERNEL__
14 #include <linux/spinlock.h>
15 #include <linux/wait.h>
16 #include <linux/sched.h>
17 #include <linux/sysdev.h>
18 #include <asm/cpu/dma.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. */
23 /* But... */
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)
29 #else
30 # define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS)
31 #endif
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
47 enum {
48 DMAC_CHANNELS_CONFIGURED = 0x01,
49 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */
53 * DMA channel capabilities / flags
55 enum {
56 DMA_CONFIGURED = 0x01,
59 * Transfer end interrupt, inherited from DMAC.
60 * wait_queue used in dma_wait_for_completion.
62 DMA_TEI_CAPABLE = 0x02,
65 extern spinlock_t dma_spin_lock;
67 struct dma_channel;
69 struct dma_ops {
70 int (*request)(struct dma_channel *chan);
71 void (*free)(struct dma_channel *chan);
73 int (*get_residue)(struct dma_channel *chan);
74 int (*xfer)(struct dma_channel *chan);
75 int (*configure)(struct dma_channel *chan, unsigned long flags);
76 int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
79 struct dma_channel {
80 char dev_id[16]; /* unique name per DMAC of channel */
82 unsigned int chan; /* DMAC channel number */
83 unsigned int vchan; /* Virtual channel number */
85 unsigned int mode;
86 unsigned int count;
88 unsigned long sar;
89 unsigned long dar;
91 const char **caps;
93 unsigned long flags;
94 atomic_t busy;
96 wait_queue_head_t wait_queue;
98 struct sys_device dev;
99 void *priv_data;
102 struct dma_info {
103 struct platform_device *pdev;
105 const char *name;
106 unsigned int nr_channels;
107 unsigned long flags;
109 struct dma_ops *ops;
110 struct dma_channel *channels;
112 struct list_head list;
113 int first_channel_nr;
114 int first_vchannel_nr;
117 struct dma_chan_caps {
118 int ch_num;
119 const char **caplist;
122 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
124 /* arch/sh/drivers/dma/dma-api.c */
125 extern int dma_xfer(unsigned int chan, unsigned long from,
126 unsigned long to, size_t size, unsigned int mode);
128 #define dma_write(chan, from, to, size) \
129 dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
130 #define dma_write_page(chan, from, to) \
131 dma_write(chan, from, to, PAGE_SIZE)
133 #define dma_read(chan, from, to, size) \
134 dma_xfer(chan, from, to, size, DMA_MODE_READ)
135 #define dma_read_page(chan, from, to) \
136 dma_read(chan, from, to, PAGE_SIZE)
138 extern int request_dma_bycap(const char **dmac, const char **caps,
139 const char *dev_id);
140 extern int request_dma(unsigned int chan, const char *dev_id);
141 extern void free_dma(unsigned int chan);
142 extern int get_dma_residue(unsigned int chan);
143 extern struct dma_info *get_dma_info(unsigned int chan);
144 extern struct dma_channel *get_dma_channel(unsigned int chan);
145 extern void dma_wait_for_completion(unsigned int chan);
146 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
148 extern int register_dmac(struct dma_info *info);
149 extern void unregister_dmac(struct dma_info *info);
150 extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
152 extern int dma_extend(unsigned int chan, unsigned long op, void *param);
153 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
155 /* arch/sh/drivers/dma/dma-sysfs.c */
156 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
157 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
159 #ifdef CONFIG_PCI
160 extern int isa_dma_bridge_buggy;
161 #else
162 #define isa_dma_bridge_buggy (0)
163 #endif
165 #endif /* __KERNEL__ */
166 #endif /* __ASM_SH_DMA_H */