/arch/sh/include/asm/dma.h

http://github.com/mirrors/linux · C Header · 148 lines · 92 code · 33 blank · 23 comment · 0 complexity · 4bb4176780c411f6dab4aa044ae9b451 MD5 · raw file

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