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 <asm/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#define MAX_DMA_ADDRESS (PAGE_OFFSET+0x10000000) 25 26#ifdef CONFIG_NR_DMA_CHANNELS 27# define MAX_DMA_CHANNELS (CONFIG_NR_DMA_CHANNELS) 28#else 29# define MAX_DMA_CHANNELS (CONFIG_NR_ONCHIP_DMA_CHANNELS) 30#endif 31 32/* 33 * Read and write modes can mean drastically different things depending on the 34 * channel configuration. Consult your DMAC documentation and module 35 * implementation for further clues. 36 */ 37#define DMA_MODE_READ 0x00 38#define DMA_MODE_WRITE 0x01 39#define DMA_MODE_MASK 0x01 40 41#define DMA_AUTOINIT 0x10 42 43/* 44 * DMAC (dma_info) flags 45 */ 46enum { 47 DMAC_CHANNELS_CONFIGURED = 0x01, 48 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */ 49}; 50 51/* 52 * DMA channel capabilities / flags 53 */ 54enum { 55 DMA_CONFIGURED = 0x01, 56 57 /* 58 * Transfer end interrupt, inherited from DMAC. 59 * wait_queue used in dma_wait_for_completion. 60 */ 61 DMA_TEI_CAPABLE = 0x02, 62}; 63 64extern spinlock_t dma_spin_lock; 65 66struct dma_channel; 67 68struct dma_ops { 69 int (*request)(struct dma_channel *chan); 70 void (*free)(struct dma_channel *chan); 71 72 int (*get_residue)(struct dma_channel *chan); 73 int (*xfer)(struct dma_channel *chan); 74 int (*configure)(struct dma_channel *chan, unsigned long flags); 75 int (*extend)(struct dma_channel *chan, unsigned long op, void *param); 76}; 77 78struct dma_channel { 79 char dev_id[16]; /* unique name per DMAC of channel */ 80 81 unsigned int chan; /* DMAC channel number */ 82 unsigned int vchan; /* Virtual channel number */ 83 84 unsigned int mode; 85 unsigned int count; 86 87 unsigned long sar; 88 unsigned long dar; 89 90 const char **caps; 91 92 unsigned long flags; 93 atomic_t busy; 94 95 wait_queue_head_t wait_queue; 96 97 struct sys_device dev; 98 void *priv_data; 99}; 100 101struct dma_info { 102 struct platform_device *pdev; 103 104 const char *name; 105 unsigned int nr_channels; 106 unsigned long flags; 107 108 struct dma_ops *ops; 109 struct dma_channel *channels; 110 111 struct list_head list; 112 int first_channel_nr; 113}; 114 115struct dma_chan_caps { 116 int ch_num; 117 const char **caplist; 118}; 119 120#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev) 121 122/* arch/sh/drivers/dma/dma-api.c */ 123extern int dma_xfer(unsigned int chan, unsigned long from, 124 unsigned long to, size_t size, unsigned int mode); 125 126#define dma_write(chan, from, to, size) \ 127 dma_xfer(chan, from, to, size, DMA_MODE_WRITE) 128#define dma_write_page(chan, from, to) \ 129 dma_write(chan, from, to, PAGE_SIZE) 130 131#define dma_read(chan, from, to, size) \ 132 dma_xfer(chan, from, to, size, DMA_MODE_READ) 133#define dma_read_page(chan, from, to) \ 134 dma_read(chan, from, to, PAGE_SIZE) 135 136extern int request_dma_bycap(const char **dmac, const char **caps, 137 const char *dev_id); 138extern int request_dma(unsigned int chan, const char *dev_id); 139extern void free_dma(unsigned int chan); 140extern int get_dma_residue(unsigned int chan); 141extern struct dma_info *get_dma_info(unsigned int chan); 142extern struct dma_channel *get_dma_channel(unsigned int chan); 143extern void dma_wait_for_completion(unsigned int chan); 144extern void dma_configure_channel(unsigned int chan, unsigned long flags); 145 146extern int register_dmac(struct dma_info *info); 147extern void unregister_dmac(struct dma_info *info); 148extern struct dma_info *get_dma_info_by_name(const char *dmac_name); 149 150extern int dma_extend(unsigned int chan, unsigned long op, void *param); 151extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist); 152 153#ifdef CONFIG_SYSFS 154/* arch/sh/drivers/dma/dma-sysfs.c */ 155extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *); 156extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *); 157#else 158#define dma_create_sysfs_file(channel, info) do { } while (0) 159#define dma_remove_sysfs_file(channel, info) do { } while (0) 160#endif 161 162#ifdef CONFIG_PCI 163extern int isa_dma_bridge_buggy; 164#else 165#define isa_dma_bridge_buggy (0) 166#endif 167 168#endif /* __KERNEL__ */ 169#endif /* __ASM_SH_DMA_H */ 170