1 /* SPDX-License-Identifier: GPL-2.0 2 * 3 * include/asm-sh/dma.h 4 * 5 * Copyright (C) 2003, 2004 Paul Mundt 6 */ 7 #ifndef __ASM_SH_DMA_H 8 #define __ASM_SH_DMA_H 9 #ifdef __KERNEL__ 10 11 #include <linux/spinlock.h> 12 #include <linux/wait.h> 13 #include <linux/sched.h> 14 #include <linux/device.h> 15 #include <asm-generic/dma.h> 16 17 /* 18 * Read and write modes can mean drastically different things depending on the 19 * channel configuration. Consult your DMAC documentation and module 20 * implementation for further clues. 21 */ 22 #define DMA_MODE_READ 0x00 23 #define DMA_MODE_WRITE 0x01 24 #define DMA_MODE_MASK 0x01 25 26 #define DMA_AUTOINIT 0x10 27 28 /* 29 * DMAC (dma_info) flags 30 */ 31 enum { 32 DMAC_CHANNELS_CONFIGURED = 0x01, 33 DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */ 34 }; 35 36 /* 37 * DMA channel capabilities / flags 38 */ 39 enum { 40 DMA_CONFIGURED = 0x01, 41 42 /* 43 * Transfer end interrupt, inherited from DMAC. 44 * wait_queue used in dma_wait_for_completion. 45 */ 46 DMA_TEI_CAPABLE = 0x02, 47 }; 48 49 extern spinlock_t dma_spin_lock; 50 51 struct dma_channel; 52 53 struct dma_ops { 54 int (*request)(struct dma_channel *chan); 55 void (*free)(struct dma_channel *chan); 56 57 int (*get_residue)(struct dma_channel *chan); 58 int (*xfer)(struct dma_channel *chan); 59 int (*configure)(struct dma_channel *chan, unsigned long flags); 60 int (*extend)(struct dma_channel *chan, unsigned long op, void *param); 61 }; 62 63 struct dma_channel { 64 char dev_id[16]; /* unique name per DMAC of channel */ 65 66 unsigned int chan; /* DMAC channel number */ 67 unsigned int vchan; /* Virtual channel number */ 68 69 unsigned int mode; 70 unsigned int count; 71 72 unsigned long sar; 73 unsigned long dar; 74 75 const char **caps; 76 77 unsigned long flags; 78 atomic_t busy; 79 80 wait_queue_head_t wait_queue; 81 82 struct device dev; 83 void *priv_data; 84 }; 85 86 struct dma_info { 87 struct platform_device *pdev; 88 89 const char *name; 90 unsigned int nr_channels; 91 unsigned long flags; 92 93 struct dma_ops *ops; 94 struct dma_channel *channels; 95 96 struct list_head list; 97 int first_channel_nr; 98 int first_vchannel_nr; 99 }; 100 101 struct dma_chan_caps { 102 int ch_num; 103 const char **caplist; 104 }; 105 106 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev) 107 108 /* arch/sh/drivers/dma/dma-api.c */ 109 extern int dma_xfer(unsigned int chan, unsigned long from, 110 unsigned long to, size_t size, unsigned int mode); 111 112 #define dma_write(chan, from, to, size) \ 113 dma_xfer(chan, from, to, size, DMA_MODE_WRITE) 114 #define dma_write_page(chan, from, to) \ 115 dma_write(chan, from, to, PAGE_SIZE) 116 117 #define dma_read(chan, from, to, size) \ 118 dma_xfer(chan, from, to, size, DMA_MODE_READ) 119 #define dma_read_page(chan, from, to) \ 120 dma_read(chan, from, to, PAGE_SIZE) 121 122 extern int request_dma_bycap(const char **dmac, const char **caps, 123 const char *dev_id); 124 extern int get_dma_residue(unsigned int chan); 125 extern struct dma_info *get_dma_info(unsigned int chan); 126 extern struct dma_channel *get_dma_channel(unsigned int chan); 127 extern void dma_wait_for_completion(unsigned int chan); 128 extern void dma_configure_channel(unsigned int chan, unsigned long flags); 129 130 extern int register_dmac(struct dma_info *info); 131 extern void unregister_dmac(struct dma_info *info); 132 extern struct dma_info *get_dma_info_by_name(const char *dmac_name); 133 134 extern int dma_extend(unsigned int chan, unsigned long op, void *param); 135 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist); 136 137 /* arch/sh/drivers/dma/dma-sysfs.c */ 138 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *); 139 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *); 140 141 #ifdef CONFIG_PCI 142 extern int isa_dma_bridge_buggy; 143 #else 144 #define isa_dma_bridge_buggy (0) 145 #endif 146 147 #endif /* __KERNEL__ */ 148 #endif /* __ASM_SH_DMA_H */ 149
