2 * linux/include/asm-arm/imxads/dma.h
4 * Copyright (C) 1997,1998 Russell King
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.
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.
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
23 #ifndef __ASM_ARCH_IMX_DMA_H
24 #define __ASM_ARCH_IMX_DMA_H
26 #define IMX_DMA_CHANNELS 11
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
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.
46 struct imx_dma_channel
{
48 void (*irq_handler
) (int, void *, struct pt_regs
*);
49 void (*err_handler
) (int, void *, struct pt_regs
*);
52 struct scatterlist
*sg
;
55 unsigned int resbytes
;
59 extern struct imx_dma_channel imx_dma_channels
[IMX_DMA_CHANNELS
];
62 /* The type to distinguish channel numbers parameter from ordinal int type */
63 typedef int imx_dmach_t
;
66 imx_dma_setup_single(imx_dmach_t dma_ch
, dma_addr_t dma_address
,
67 unsigned int dma_length
, unsigned int dev_addr
, dmamode_t dmamode
);
70 imx_dma_setup_sg(imx_dmach_t dma_ch
,
71 struct scatterlist
*sg
, unsigned int sgcount
, unsigned int dma_length
,
72 unsigned int dev_addr
, dmamode_t dmamode
);
75 imx_dma_setup_handlers(imx_dmach_t dma_ch
,
76 void (*irq_handler
) (int, void *, struct pt_regs
*),
77 void (*err_handler
) (int, void *, struct pt_regs
*), void *data
);
79 void imx_dma_enable(imx_dmach_t dma_ch
);
81 void imx_dma_disable(imx_dmach_t dma_ch
);
83 int imx_dma_request(imx_dmach_t dma_ch
, const char *name
);
85 void imx_dma_free(imx_dmach_t dma_ch
);
87 int imx_dma_request_by_prio(imx_dmach_t
*pdma_ch
, const char *name
, imx_dma_prio prio
);
90 #endif /* _ASM_ARCH_IMX_DMA_H */