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/sysdev.h> 18 #include <cpu/dma.h> 19 #include <asm-generic/dma.h> 20 21 #ifdef CONFIG_NR_DMA_CHANNELS 22 # define MAX_DMA_CHANNELS (CONFIG_NR_DMA_CHANNELS) 23 #elif defined(CONFIG_NR_ONCHIP_DMA_CHANNELS) 24 # define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS) 25 #else 26 # define MAX_DMA_CHANNELS 0 27 #endif 28 29 /* 30 * Read and write modes can mean drastically different things depending on the 31 * channel configuration. Consult your DMAC documentation and module 32 * implementation for further clues. 33 */ 34 #define DMA_MODE_READ 0x00 35 #define DMA_MODE_WRITE 0x01 36 #define DMA_MODE_MASK 0x01 37 38 #define DMA_AUTOINIT 0x10 39 40 /* 41 * DMAC (dma_info) flags 42 */ 43 enum { 44 DMAC_CHANNELS_CONFIGURED = 0x01, 45 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */ 46 }; 47 48 /* 49 * DMA channel capabilities / flags 50 */ 51 enum { 52 DMA_CONFIGURED = 0x01, 53 54 /* 55 * Transfer end interrupt, inherited from DMAC. 56 * wait_queue used in dma_wait_for_completion. 57 */ 58 DMA_TEI_CAPABLE = 0x02, 59 }; 60 61 extern spinlock_t dma_spin_lock; 62 63 struct dma_channel; 64 65 struct dma_ops { 66 int (*request)(struct dma_channel *chan); 67 void (*free)(struct dma_channel *chan); 68 69 int (*get_residue)(struct dma_channel *chan); 70 int (*xfer)(struct dma_channel *chan); 71 int (*configure)(struct dma_channel *chan, unsigned long flags); 72 int (*extend)(struct dma_channel *chan, unsigned long op, void *param); 73 }; 74 75 struct dma_channel { 76 char dev_id[16]; /* unique name per DMAC of channel */ 77 78 unsigned int chan; /* DMAC channel number */ 79 unsigned int vchan; /* Virtual channel number */ 80 81 unsigned int mode; 82 unsigned int count; 83 84 unsigned long sar; 85 unsigned long dar; 86 87 const char **caps; 88 89 unsigned long flags; 90 atomic_t busy; 91 92 wait_queue_head_t wait_queue; 93 94 struct sys_device dev; 95 void *priv_data; 96 }; 97 98 struct dma_info { 99 struct platform_device *pdev; 100 101 const char *name; 102 unsigned int nr_channels; 103 unsigned long flags; 104 105 struct dma_ops *ops; 106 struct dma_channel *channels; 107 108 struct list_head list; 109 int first_channel_nr; 110 int first_vchannel_nr; 111 }; 112 113 struct dma_chan_caps { 114 int ch_num; 115 const char **caplist; 116 }; 117 118 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev) 119 120 /* arch/sh/drivers/dma/dma-api.c */ 121 extern int dma_xfer(unsigned int chan, unsigned long from, 122 unsigned long to, size_t size, unsigned int mode); 123 124 #define dma_write(chan, from, to, size) \ 125 dma_xfer(chan, from, to, size, DMA_MODE_WRITE) 126 #define dma_write_page(chan, from, to) \ 127 dma_write(chan, from, to, PAGE_SIZE) 128 129 #define dma_read(chan, from, to, size) \ 130 dma_xfer(chan, from, to, size, DMA_MODE_READ) 131 #define dma_read_page(chan, from, to) \ 132 dma_read(chan, from, to, PAGE_SIZE) 133 134 extern int request_dma_bycap(const char **dmac, const char **caps, 135 const char *dev_id); 136 extern int get_dma_residue(unsigned int chan); 137 extern struct dma_info *get_dma_info(unsigned int chan); 138 extern struct dma_channel *get_dma_channel(unsigned int chan); 139 extern void dma_wait_for_completion(unsigned int chan); 140 extern void dma_configure_channel(unsigned int chan, unsigned long flags); 141 142 extern int register_dmac(struct dma_info *info); 143 extern void unregister_dmac(struct dma_info *info); 144 extern struct dma_info *get_dma_info_by_name(const char *dmac_name); 145 146 extern int dma_extend(unsigned int chan, unsigned long op, void *param); 147 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist); 148 149 /* arch/sh/drivers/dma/dma-sysfs.c */ 150 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *); 151 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *); 152 153 #ifdef CONFIG_PCI 154 extern int isa_dma_bridge_buggy; 155 #else 156 #define isa_dma_bridge_buggy (0) 157 #endif 158 159 #endif /* __KERNEL__ */ 160 #endif /* __ASM_SH_DMA_H */ 161