linux/drivers/dma/coh901318.h
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   1/*
   2 * Copyright (C) 2007-2013 ST-Ericsson
   3 * License terms: GNU General Public License (GPL) version 2
   4 * DMA driver for COH 901 318
   5 * Author: Per Friden <per.friden@stericsson.com>
   6 */
   7
   8#ifndef COH901318_H
   9#define COH901318_H
  10
  11#define MAX_DMA_PACKET_SIZE_SHIFT 11
  12#define MAX_DMA_PACKET_SIZE (1 << MAX_DMA_PACKET_SIZE_SHIFT)
  13
  14struct device;
  15
  16struct coh901318_pool {
  17        spinlock_t lock;
  18        struct dma_pool *dmapool;
  19        struct device *dev;
  20
  21#ifdef CONFIG_DEBUG_FS
  22        int debugfs_pool_counter;
  23#endif
  24};
  25
  26/**
  27 * struct coh901318_lli - linked list item for DMAC
  28 * @control: control settings for DMAC
  29 * @src_addr: transfer source address
  30 * @dst_addr: transfer destination address
  31 * @link_addr:  physical address to next lli
  32 * @virt_link_addr: virtual address of next lli (only used by pool_free)
  33 * @phy_this: physical address of current lli (only used by pool_free)
  34 */
  35struct coh901318_lli {
  36        u32 control;
  37        dma_addr_t src_addr;
  38        dma_addr_t dst_addr;
  39        dma_addr_t link_addr;
  40
  41        void *virt_link_addr;
  42        dma_addr_t phy_this;
  43};
  44
  45/**
  46 * coh901318_pool_create() - Creates an dma pool for lli:s
  47 * @pool: pool handle
  48 * @dev: dma device
  49 * @lli_nbr: number of lli:s in the pool
  50 * @algin: address alignemtn of lli:s
  51 * returns 0 on success otherwise none zero
  52 */
  53int coh901318_pool_create(struct coh901318_pool *pool,
  54                          struct device *dev,
  55                          size_t lli_nbr, size_t align);
  56
  57/**
  58 * coh901318_pool_destroy() - Destroys the dma pool
  59 * @pool: pool handle
  60 * returns 0 on success otherwise none zero
  61 */
  62int coh901318_pool_destroy(struct coh901318_pool *pool);
  63
  64/**
  65 * coh901318_lli_alloc() - Allocates a linked list
  66 *
  67 * @pool: pool handle
  68 * @len: length to list
  69 * return: none NULL if success otherwise NULL
  70 */
  71struct coh901318_lli *
  72coh901318_lli_alloc(struct coh901318_pool *pool,
  73                    unsigned int len);
  74
  75/**
  76 * coh901318_lli_free() - Returns the linked list items to the pool
  77 * @pool: pool handle
  78 * @lli: reference to lli pointer to be freed
  79 */
  80void coh901318_lli_free(struct coh901318_pool *pool,
  81                        struct coh901318_lli **lli);
  82
  83/**
  84 * coh901318_lli_fill_memcpy() - Prepares the lli:s for dma memcpy
  85 * @pool: pool handle
  86 * @lli: allocated lli
  87 * @src: src address
  88 * @size: transfer size
  89 * @dst: destination address
  90 * @ctrl_chained: ctrl for chained lli
  91 * @ctrl_last: ctrl for the last lli
  92 * returns number of CPU interrupts for the lli, negative on error.
  93 */
  94int
  95coh901318_lli_fill_memcpy(struct coh901318_pool *pool,
  96                          struct coh901318_lli *lli,
  97                          dma_addr_t src, unsigned int size,
  98                          dma_addr_t dst, u32 ctrl_chained, u32 ctrl_last);
  99
 100/**
 101 * coh901318_lli_fill_single() - Prepares the lli:s for dma single transfer
 102 * @pool: pool handle
 103 * @lli: allocated lli
 104 * @buf: transfer buffer
 105 * @size: transfer size
 106 * @dev_addr: address of periphal
 107 * @ctrl_chained: ctrl for chained lli
 108 * @ctrl_last: ctrl for the last lli
 109 * @dir: direction of transfer (to or from device)
 110 * returns number of CPU interrupts for the lli, negative on error.
 111 */
 112int
 113coh901318_lli_fill_single(struct coh901318_pool *pool,
 114                          struct coh901318_lli *lli,
 115                          dma_addr_t buf, unsigned int size,
 116                          dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl_last,
 117                          enum dma_transfer_direction dir);
 118
 119/**
 120 * coh901318_lli_fill_single() - Prepares the lli:s for dma scatter list transfer
 121 * @pool: pool handle
 122 * @lli: allocated lli
 123 * @sg: scatter gather list
 124 * @nents: number of entries in sg
 125 * @dev_addr: address of periphal
 126 * @ctrl_chained: ctrl for chained lli
 127 * @ctrl: ctrl of middle lli
 128 * @ctrl_last: ctrl for the last lli
 129 * @dir: direction of transfer (to or from device)
 130 * @ctrl_irq_mask: ctrl mask for CPU interrupt
 131 * returns number of CPU interrupts for the lli, negative on error.
 132 */
 133int
 134coh901318_lli_fill_sg(struct coh901318_pool *pool,
 135                      struct coh901318_lli *lli,
 136                      struct scatterlist *sg, unsigned int nents,
 137                      dma_addr_t dev_addr, u32 ctrl_chained,
 138                      u32 ctrl, u32 ctrl_last,
 139                      enum dma_transfer_direction dir, u32 ctrl_irq_mask);
 140
 141#endif /* COH901318_H */
 142
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