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 int (*extend)(struct dma_channel *chan, unsigned long op, void *param); 60 }; 61 62 struct dma_channel { 63 char dev_id[16]; /* unique name per DMAC of channel */ 64 65 unsigned int chan; /* DMAC channel number */ 66 unsigned int vchan; /* Virtual channel number */ 67 68 unsigned int mode; 69 unsigned int count; 70 71 unsigned long sar; 72 unsigned long dar; 73 74 const char **caps; 75 76 unsigned long flags; 77 atomic_t busy; 78 79 wait_queue_head_t wait_queue; 80 81 struct device dev; 82 void *priv_data; 83 }; 84 85 struct dma_info { 86 struct platform_device *pdev; 87 88 const char *name; 89 unsigned int nr_channels; 90 unsigned long flags; 91 92 struct dma_ops *ops; 93 struct dma_channel *channels; 94 95 struct list_head list; 96 int first_channel_nr; 97 int first_vchannel_nr; 98 }; 99 100 struct dma_chan_caps { 101 int ch_num; 102 const char **caplist; 103 }; 104 105 #define to_dma_channel(channel) container_of(channel, struct dma_channel, dev) 106 107 /* arch/sh/drivers/dma/dma-api.c */ 108 extern int dma_xfer(unsigned int chan, unsigned long from, 109 unsigned long to, size_t size, unsigned int mode); 110 111 #define dma_write(chan, from, to, size) \ 112 dma_xfer(chan, from, to, size, DMA_MODE_WRITE) 113 #define dma_write_page(chan, from, to) \ 114 dma_write(chan, from, to, PAGE_SIZE) 115 116 #define dma_read(chan, from, to, size) \ 117 dma_xfer(chan, from, to, size, DMA_MODE_READ) 118 #define dma_read_page(chan, from, to) \ 119 dma_read(chan, from, to, PAGE_SIZE) 120 121 extern int request_dma_bycap(const char **dmac, const char **caps, 122 const char *dev_id); 123 extern int get_dma_residue(unsigned int chan); 124 extern struct dma_info *get_dma_info(unsigned int chan); 125 extern struct dma_channel *get_dma_channel(unsigned int chan); 126 extern void dma_wait_for_completion(unsigned int chan); 127 extern void dma_configure_channel(unsigned int chan, unsigned long flags); 128 129 extern int register_dmac(struct dma_info *info); 130 extern void unregister_dmac(struct dma_info *info); 131 extern struct dma_info *get_dma_info_by_name(const char *dmac_name); 132 133 extern int dma_extend(unsigned int chan, unsigned long op, void *param); 134 extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist); 135 136 /* arch/sh/drivers/dma/dma-sysfs.c */ 137 extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *); 138 extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *); 139 140 #endif /* __ASM_SH_DMA_H */ 141