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 46struct 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 59extern 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 */ 67typedef int imx_dmach_t; 68 69int 70imx_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 73int 74imx_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 78int 79imx_dma_setup_handlers(imx_dmach_t dma_ch, 80 void (*irq_handler) (int, void *), 81 void (*err_handler) (int, void *, int), void *data); 82 83void imx_dma_enable(imx_dmach_t dma_ch); 84 85void imx_dma_disable(imx_dmach_t dma_ch); 86 87int imx_dma_request(imx_dmach_t dma_ch, const char *name); 88 89void imx_dma_free(imx_dmach_t dma_ch); 90 91int 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 */ 95