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Linux/arch/sh/include/asm/dma.h

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  1 /*
  2  * include/asm-sh/dma.h
  3  *
  4  * Copyright (C) 2003, 2004  Paul Mundt
  5  *
  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__
 13 
 14 #include <linux/spinlock.h>
 15 #include <linux/wait.h>
 16 #include <linux/sched.h>
 17 #include <linux/device.h>
 18 #include <asm-generic/dma.h>
 19 
 20 /*
 21  * Read and write modes can mean drastically different things depending on the
 22  * channel configuration. Consult your DMAC documentation and module
 23  * implementation for further clues.
 24  */
 25 #define DMA_MODE_READ           0x00
 26 #define DMA_MODE_WRITE          0x01
 27 #define DMA_MODE_MASK           0x01
 28 
 29 #define DMA_AUTOINIT            0x10
 30 
 31 /*
 32  * DMAC (dma_info) flags
 33  */
 34 enum {
 35         DMAC_CHANNELS_CONFIGURED        = 0x01,
 36         DMAC_CHANNELS_TEI_CAPABLE       = 0x02, /* Transfer end interrupt */
 37 };
 38 
 39 /*
 40  * DMA channel capabilities / flags
 41  */
 42 enum {
 43         DMA_CONFIGURED                  = 0x01,
 44 
 45         /*
 46          * Transfer end interrupt, inherited from DMAC.
 47          * wait_queue used in dma_wait_for_completion.
 48          */
 49         DMA_TEI_CAPABLE                 = 0x02,
 50 };
 51 
 52 extern spinlock_t dma_spin_lock;
 53 
 54 struct dma_channel;
 55 
 56 struct dma_ops {
 57         int (*request)(struct dma_channel *chan);
 58         void (*free)(struct dma_channel *chan);
 59 
 60         int (*get_residue)(struct dma_channel *chan);
 61         int (*xfer)(struct dma_channel *chan);
 62         int (*configure)(struct dma_channel *chan, unsigned long flags);
 63         int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
 64 };
 65 
 66 struct dma_channel {
 67         char dev_id[16];                /* unique name per DMAC of channel */
 68 
 69         unsigned int chan;              /* DMAC channel number */
 70         unsigned int vchan;             /* Virtual channel number */
 71 
 72         unsigned int mode;
 73         unsigned int count;
 74 
 75         unsigned long sar;
 76         unsigned long dar;
 77 
 78         const char **caps;
 79 
 80         unsigned long flags;
 81         atomic_t busy;
 82 
 83         wait_queue_head_t wait_queue;
 84 
 85         struct device dev;
 86         void *priv_data;
 87 };
 88 
 89 struct dma_info {
 90         struct platform_device *pdev;
 91 
 92         const char *name;
 93         unsigned int nr_channels;
 94         unsigned long flags;
 95 
 96         struct dma_ops *ops;
 97         struct dma_channel *channels;
 98 
 99         struct list_head list;
100         int first_channel_nr;
101         int first_vchannel_nr;
102 };
103 
104 struct dma_chan_caps {
105         int ch_num;
106         const char **caplist;
107 };
108 
109 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
110 
111 /* arch/sh/drivers/dma/dma-api.c */
112 extern int dma_xfer(unsigned int chan, unsigned long from,
113                     unsigned long to, size_t size, unsigned int mode);
114 
115 #define dma_write(chan, from, to, size) \
116         dma_xfer(chan, from, to, size, DMA_MODE_WRITE)
117 #define dma_write_page(chan, from, to)  \
118         dma_write(chan, from, to, PAGE_SIZE)
119 
120 #define dma_read(chan, from, to, size)  \
121         dma_xfer(chan, from, to, size, DMA_MODE_READ)
122 #define dma_read_page(chan, from, to)   \
123         dma_read(chan, from, to, PAGE_SIZE)
124 
125 extern int request_dma_bycap(const char **dmac, const char **caps,
126                              const char *dev_id);
127 extern int get_dma_residue(unsigned int chan);
128 extern struct dma_info *get_dma_info(unsigned int chan);
129 extern struct dma_channel *get_dma_channel(unsigned int chan);
130 extern void dma_wait_for_completion(unsigned int chan);
131 extern void dma_configure_channel(unsigned int chan, unsigned long flags);
132 
133 extern int register_dmac(struct dma_info *info);
134 extern void unregister_dmac(struct dma_info *info);
135 extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
136 
137 extern int dma_extend(unsigned int chan, unsigned long op, void *param);
138 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
139 
140 /* arch/sh/drivers/dma/dma-sysfs.c */
141 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
142 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
143 
144 #ifdef CONFIG_PCI
145 extern int isa_dma_bridge_buggy;
146 #else
147 #define isa_dma_bridge_buggy    (0)
148 #endif
149 
150 #endif /* __KERNEL__ */
151 #endif /* __ASM_SH_DMA_H */
152 

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