95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
/*
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* linux/include/asm-arm/imxads/dma.h
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*
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* Copyright (C) 1997,1998 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <asm/dma.h>
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#ifndef __ASM_ARCH_IMX_DMA_H
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#define __ASM_ARCH_IMX_DMA_H
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#define IMX_DMA_CHANNELS 11
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/*
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* struct imx_dma_channel - i.MX specific DMA extension
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* @name: name specified by DMA client
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* @irq_handler: client callback for end of transfer
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* @err_handler: client callback for error condition
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* @data: clients context data for callbacks
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* @dma_mode: direction of the transfer %DMA_MODE_READ or %DMA_MODE_WRITE
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* @sg: pointer to the actual read/written chunk for scatter-gather emulation
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* @sgbc: counter of processed bytes in the actual read/written chunk
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* @resbytes: total residual number of bytes to transfer
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* (it can be lower or same as sum of SG mapped chunk sizes)
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* @sgcount: number of chunks to be read/written
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*
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* Structure is used for IMX DMA processing. It would be probably good
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* @struct dma_struct in the future for external interfacing and use
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* @struct imx_dma_channel only as extension to it.
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*/
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struct imx_dma_channel {
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const char *name;
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void (*irq_handler) (int, void *);
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void (*err_handler) (int, void *, int errcode);
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void *data;
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dmamode_t dma_mode;
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struct scatterlist *sg;
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unsigned int sgbc;
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unsigned int sgcount;
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unsigned int resbytes;
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int dma_num;
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};
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extern struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS];
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#define IMX_DMA_ERR_BURST 1
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#define IMX_DMA_ERR_REQUEST 2
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#define IMX_DMA_ERR_TRANSFER 4
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#define IMX_DMA_ERR_BUFFER 8
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/* The type to distinguish channel numbers parameter from ordinal int type */
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typedef int imx_dmach_t;
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int
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imx_dma_setup_single(imx_dmach_t dma_ch, dma_addr_t dma_address,
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unsigned int dma_length, unsigned int dev_addr, dmamode_t dmamode);
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int
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imx_dma_setup_sg(imx_dmach_t dma_ch,
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struct scatterlist *sg, unsigned int sgcount, unsigned int dma_length,
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unsigned int dev_addr, dmamode_t dmamode);
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int
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imx_dma_setup_handlers(imx_dmach_t dma_ch,
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void (*irq_handler) (int, void *),
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void (*err_handler) (int, void *, int), void *data);
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void imx_dma_enable(imx_dmach_t dma_ch);
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void imx_dma_disable(imx_dmach_t dma_ch);
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int imx_dma_request(imx_dmach_t dma_ch, const char *name);
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void imx_dma_free(imx_dmach_t dma_ch);
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int imx_dma_request_by_prio(imx_dmach_t *pdma_ch, const char *name, imx_dma_prio prio);
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#endif /* _ASM_ARCH_IMX_DMA_H */
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