[linux-block.git] / arch / arm / mach-imx / include / mach / imx-dma.h

/*
 *  linux/include/asm-arm/imxads/dma.h
 *
 *  Copyright (C) 1997,1998 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <mach/dma.h>

#ifndef __ASM_ARCH_IMX_DMA_H
#define __ASM_ARCH_IMX_DMA_H

#define IMX_DMA_CHANNELS  11

/*
 * struct imx_dma_channel - i.MX specific DMA extension
 * @name: name specified by DMA client
 * @irq_handler: client callback for end of transfer
 * @err_handler: client callback for error condition
 * @data: clients context data for callbacks
 * @dma_mode: direction of the transfer %DMA_MODE_READ or %DMA_MODE_WRITE
 * @sg: pointer to the actual read/written chunk for scatter-gather emulation
 * @sgbc: counter of processed bytes in the actual read/written chunk
 * @resbytes: total residual number of bytes to transfer
 *            (it can be lower or same as sum of SG mapped chunk sizes)
 * @sgcount: number of chunks to be read/written
 *
 * Structure is used for IMX DMA processing. It would be probably good
 * @struct dma_struct in the future for external interfacing and use
 * @struct imx_dma_channel only as extension to it.
 */

struct imx_dma_channel {
	const char *name;
	void (*irq_handler) (int, void *);
	void (*err_handler) (int, void *, int errcode);
	void *data;
	unsigned int  dma_mode;
	struct scatterlist *sg;
	unsigned int sgbc;
	unsigned int sgcount;
	unsigned int resbytes;
	int dma_num;
};

extern struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS];

#define IMX_DMA_ERR_BURST     1
#define IMX_DMA_ERR_REQUEST   2
#define IMX_DMA_ERR_TRANSFER  4
#define IMX_DMA_ERR_BUFFER    8

/* The type to distinguish channel numbers parameter from ordinal int type */
typedef int imx_dmach_t;

#define DMA_MODE_READ		0
#define DMA_MODE_WRITE		1
#define DMA_MODE_MASK		1

int
imx_dma_setup_single(imx_dmach_t dma_ch, dma_addr_t dma_address,
		unsigned int dma_length, unsigned int dev_addr, unsigned int dmamode);

int
imx_dma_setup_sg(imx_dmach_t dma_ch,
		 struct scatterlist *sg, unsigned int sgcount, unsigned int dma_length,
		 unsigned int dev_addr, unsigned int dmamode);

int
imx_dma_setup_handlers(imx_dmach_t dma_ch,
		void (*irq_handler) (int, void *),
		void (*err_handler) (int, void *, int), void *data);

void imx_dma_enable(imx_dmach_t dma_ch);

void imx_dma_disable(imx_dmach_t dma_ch);

int imx_dma_request(imx_dmach_t dma_ch, const char *name);

void imx_dma_free(imx_dmach_t dma_ch);

imx_dmach_t imx_dma_request_by_prio(const char *name, imx_dma_prio prio);


#endif	/* _ASM_ARCH_IMX_DMA_H */
Commit	Line	Data
999331af PP	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
dcea83ad	21	#include <mach/dma.h>
999331af PP	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;
0cd61b68 LT	48	void (irq_handler) (int, void );
0cd61b68 LT	49	void (err_handler) (int, void , int errcode);
999331af	50	void *data;
dcea83ad	51	unsigned int dma_mode;
999331af PP	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
fa3e686a PP	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
999331af PP	65
	66	/* The type to distinguish channel numbers parameter from ordinal int type */
	67	typedef int imx_dmach_t;
	68
dcea83ad RK	69	#define DMA_MODE_READ 0
	70	#define DMA_MODE_WRITE 1
	71	#define DMA_MODE_MASK 1
	72
999331af PP	73	int
999331af PP	74	imx_dma_setup_single(imx_dmach_t dma_ch, dma_addr_t dma_address,
dcea83ad	75	unsigned int dma_length, unsigned int dev_addr, unsigned int dmamode);
999331af PP	76
	77	int
	78	imx_dma_setup_sg(imx_dmach_t dma_ch,
	79	struct scatterlist *sg, unsigned int sgcount, unsigned int dma_length,
dcea83ad	80	unsigned int dev_addr, unsigned int dmamode);
999331af PP	81
	82	int
	83	imx_dma_setup_handlers(imx_dmach_t dma_ch,
0cd61b68 LT	84	void (irq_handler) (int, void ),
0cd61b68 LT	85	void (err_handler) (int, void , int), void *data);
999331af PP	86
	87	void imx_dma_enable(imx_dmach_t dma_ch);
	88
	89	void imx_dma_disable(imx_dmach_t dma_ch);
	90
	91	int imx_dma_request(imx_dmach_t dma_ch, const char *name);
	92
	93	void imx_dma_free(imx_dmach_t dma_ch);
	94
f7def13e	95	imx_dmach_t imx_dma_request_by_prio(const char *name, imx_dma_prio prio);
999331af PP	96
	97
	98	#endif /* _ASM_ARCH_IMX_DMA_H */