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 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) 26 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 32 33 /* 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. 37 */ 38 #define DMA_MODE_READ 0x00 39 #define DMA_MODE_WRITE 0x01 40 #define DMA_MODE_MASK 0x01 41 42 #define DMA_AUTOINIT 0x10 43 44 /* 45 * DMAC (dma_info) flags 46 */ 47 enum { 48 DMAC_CHANNELS_CONFIGURED = 0x01, 49 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */ 50 }; 51 52 /* 53 * DMA channel capabilities / flags 54 */ 55 enum { 56 DMA_CONFIGURED = 0x01, 57 58 /* 59 * Transfer end interrupt, inherited from DMAC. 60 * wait_queue used in dma_wait_for_completion. 61 */ 62 DMA_TEI_CAPABLE = 0x02, 63 }; 64 65 extern spinlock_t dma_spin_lock; 66 67 struct dma_channel; 68 69 struct dma_ops { 70 int (*request)(struct dma_channel *chan); 71 void (*free)(struct dma_channel *chan); 72 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); 77 }; 78 79 struct dma_channel { 80 char dev_id[16]; /* unique name per DMAC of channel */ 81 82 unsigned int chan; /* DMAC channel number */ 83 unsigned int vchan; /* Virtual channel number */ 84 85 unsigned int mode; 86 unsigned int count; 87 88 unsigned long sar; 89 unsigned long dar; 90 91 const char **caps; 92 93 unsigned long flags; 94 atomic_t busy; 95 96 wait_queue_head_t wait_queue; 97 98 struct sys_device dev; 99 void *priv_data; 100 }; 101 102 struct dma_info { 103 struct platform_device *pdev; 104 105 const char *name; 106 unsigned int nr_channels; 107 unsigned long flags; 108 109 struct dma_ops *ops; 110 struct dma_channel *channels; 111 112 struct list_head list; 113 int first_channel_nr; 114 int first_vchannel_nr; 115 }; 116 117 struct dma_chan_caps { 118 int ch_num; 119 const char **caplist; 120 }; 121 122 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev) 123 124 /* 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); 127 128 #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) 132 133 #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) 137 138 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); 147 148 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); 151 152 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); 154 155 /* 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 *); 158 159 #ifdef CONFIG_PCI 160 extern int isa_dma_bridge_buggy; 161 #else 162 #define isa_dma_bridge_buggy (0) 163 #endif 164 165 #endif /* __KERNEL__ */ 166 #endif /* __ASM_SH_DMA_H */ 167