drivers/dma/coh901318_lli.h

   1 /*
   2  * driver/dma/coh901318_lli.h
   3  *
   4  * Copyright (C) 2007-2009 ST-Ericsson
   5  * License terms: GNU General Public License (GPL) version 2
   6  * Support functions for handling lli for coh901318
   7  * Author: Per Friden <per.friden@stericsson.com>
   8  */
   9
  10 #ifndef COH901318_LLI_H
  11 #define COH901318_LLI_H
  12
  13 #include <mach/coh901318.h>
  14
  15 struct device;
  16
  17 struct coh901318_pool {
  18         spinlock_t lock;
  19         struct dma_pool *dmapool;
  20         struct device *dev;
  21
  22 #ifdef CONFIG_DEBUG_FS
  23         int debugfs_pool_counter;
  24 #endif
  25 };
  26
  27 struct device;
  28 /**
  29  * coh901318_pool_create() - Creates an dma pool for lli:s
  30  * @pool: pool handle
  31  * @dev: dma device
  32  * @lli_nbr: number of lli:s in the pool
  33  * @algin: address alignemtn of lli:s
  34  * returns 0 on success otherwise none zero
  35  */
  36 int coh901318_pool_create(struct coh901318_pool *pool,
  37                           struct device *dev,
  38                           size_t lli_nbr, size_t align);
  39
  40 /**
  41  * coh901318_pool_destroy() - Destroys the dma pool
  42  * @pool: pool handle
  43  * returns 0 on success otherwise none zero
  44  */
  45 int coh901318_pool_destroy(struct coh901318_pool *pool);
  46
  47 /**
  48  * coh901318_lli_alloc() - Allocates a linked list
  49  *
  50  * @pool: pool handle
  51  * @len: length to list
  52  * return: none NULL if success otherwise NULL
  53  */
  54 struct coh901318_lli *
  55 coh901318_lli_alloc(struct coh901318_pool *pool,
  56                     unsigned int len);
  57
  58 /**
  59  * coh901318_lli_free() - Returns the linked list items to the pool
  60  * @pool: pool handle
  61  * @lli: reference to lli pointer to be freed
  62  */
  63 void coh901318_lli_free(struct coh901318_pool *pool,
  64                         struct coh901318_lli **lli);
  65
  66 /**
  67  * coh901318_lli_fill_memcpy() - Prepares the lli:s for dma memcpy
  68  * @pool: pool handle
  69  * @lli: allocated lli
  70  * @src: src address
  71  * @size: transfer size
  72  * @dst: destination address
  73  * @ctrl_chained: ctrl for chained lli
  74  * @ctrl_last: ctrl for the last lli
  75  * returns number of CPU interrupts for the lli, negative on error.
  76  */
  77 int
  78 coh901318_lli_fill_memcpy(struct coh901318_pool *pool,
  79                           struct coh901318_lli *lli,
  80                           dma_addr_t src, unsigned int size,
  81                           dma_addr_t dst, u32 ctrl_chained, u32 ctrl_last);
  82
  83 /**
  84  * coh901318_lli_fill_single() - Prepares the lli:s for dma single transfer
  85  * @pool: pool handle
  86  * @lli: allocated lli
  87  * @buf: transfer buffer
  88  * @size: transfer size
  89  * @dev_addr: address of periphal
  90  * @ctrl_chained: ctrl for chained lli
  91  * @ctrl_last: ctrl for the last lli
  92  * @dir: direction of transfer (to or from device)
  93  * returns number of CPU interrupts for the lli, negative on error.
  94  */
  95 int
  96 coh901318_lli_fill_single(struct coh901318_pool *pool,
  97                           struct coh901318_lli *lli,
  98                           dma_addr_t buf, unsigned int size,
  99                           dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl_last,
 100                           enum dma_transfer_direction dir);
 101
 102 /**
 103  * coh901318_lli_fill_single() - Prepares the lli:s for dma scatter list transfer
 104  * @pool: pool handle
 105  * @lli: allocated lli
 106  * @sg: scatter gather list
 107  * @nents: number of entries in sg
 108  * @dev_addr: address of periphal
 109  * @ctrl_chained: ctrl for chained lli
 110  * @ctrl: ctrl of middle lli
 111  * @ctrl_last: ctrl for the last lli
 112  * @dir: direction of transfer (to or from device)
 113  * @ctrl_irq_mask: ctrl mask for CPU interrupt
 114  * returns number of CPU interrupts for the lli, negative on error.
 115  */
 116 int
 117 coh901318_lli_fill_sg(struct coh901318_pool *pool,
 118                       struct coh901318_lli *lli,
 119                       struct scatterlist *sg, unsigned int nents,
 120                       dma_addr_t dev_addr, u32 ctrl_chained,
 121                       u32 ctrl, u32 ctrl_last,
 122                       enum dma_transfer_direction dir, u32 ctrl_irq_mask);
 123
 124 #endif /* COH901318_LLI_H */