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