include/asm-arm/arch-imx/imx-dma.h

   1 /*
   2  *  linux/include/asm-arm/imxads/dma.h
   3  *
   4  *  Copyright (C) 1997,1998 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <asm/dma.h>
  22
  23 #ifndef __ASM_ARCH_IMX_DMA_H
  24 #define __ASM_ARCH_IMX_DMA_H
  25
  26 #define IMX_DMA_CHANNELS  11
  27
  28 /*
  29  * struct imx_dma_channel - i.MX specific DMA extension
  30  * @name: name specified by DMA client
  31  * @irq_handler: client callback for end of transfer
  32  * @err_handler: client callback for error condition
  33  * @data: clients context data for callbacks
  34  * @dma_mode: direction of the transfer %DMA_MODE_READ or %DMA_MODE_WRITE
  35  * @sg: pointer to the actual read/written chunk for scatter-gather emulation
  36  * @sgbc: counter of processed bytes in the actual read/written chunk
  37  * @resbytes: total residual number of bytes to transfer
  38  *            (it can be lower or same as sum of SG mapped chunk sizes)
  39  * @sgcount: number of chunks to be read/written
  40  *
  41  * Structure is used for IMX DMA processing. It would be probably good
  42  * @struct dma_struct in the future for external interfacing and use
  43  * @struct imx_dma_channel only as extension to it.
  44  */
  45
  46 struct imx_dma_channel {
  47         const char *name;
  48         void (*irq_handler) (int, void *);
  49         void (*err_handler) (int, void *, int errcode);
  50         void *data;
  51         dmamode_t  dma_mode;
  52         struct scatterlist *sg;
  53         unsigned int sgbc;
  54         unsigned int sgcount;
  55         unsigned int resbytes;
  56         int dma_num;
  57 };
  58
  59 extern struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS];
  60
  61 #define IMX_DMA_ERR_BURST     1
  62 #define IMX_DMA_ERR_REQUEST   2
  63 #define IMX_DMA_ERR_TRANSFER  4
  64 #define IMX_DMA_ERR_BUFFER    8
  65
  66 /* The type to distinguish channel numbers parameter from ordinal int type */
  67 typedef int imx_dmach_t;
  68
  69 int
  70 imx_dma_setup_single(imx_dmach_t dma_ch, dma_addr_t dma_address,
  71                 unsigned int dma_length, unsigned int dev_addr, dmamode_t dmamode);
  72
  73 int
  74 imx_dma_setup_sg(imx_dmach_t dma_ch,
  75                  struct scatterlist *sg, unsigned int sgcount, unsigned int dma_length,
  76                  unsigned int dev_addr, dmamode_t dmamode);
  77
  78 int
  79 imx_dma_setup_handlers(imx_dmach_t dma_ch,
  80                 void (*irq_handler) (int, void *),
  81                 void (*err_handler) (int, void *, int), void *data);
  82
  83 void imx_dma_enable(imx_dmach_t dma_ch);
  84
  85 void imx_dma_disable(imx_dmach_t dma_ch);
  86
  87 int imx_dma_request(imx_dmach_t dma_ch, const char *name);
  88
  89 void imx_dma_free(imx_dmach_t dma_ch);
  90
  91 int imx_dma_request_by_prio(imx_dmach_t *pdma_ch, const char *name, imx_dma_prio prio);
  92
  93
  94 #endif  /* _ASM_ARCH_IMX_DMA_H */