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