diff options
author | Ben Dooks <ben-linux@fluff.org> | 2008-08-08 21:10:12 +0100 |
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committer | Ben Dooks <ben-linux@fluff.org> | 2008-08-08 21:10:12 +0100 |
commit | af7a535688a758d15f06a98833e6a143b29af9de (patch) | |
tree | bac5ab210bbbbe276f0e44ed84194d7c8bb16aae /arch/arm/mach-imx/include/mach/imx-dma.h | |
parent | 0c17e4ceedd35c78b1c7413dbd16279a350be6bc (diff) | |
parent | c41107c2d4fd31924533f4dbc4c3428acc2b5894 (diff) |
Merge http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm into for-rmk
Diffstat (limited to 'arch/arm/mach-imx/include/mach/imx-dma.h')
-rw-r--r-- | arch/arm/mach-imx/include/mach/imx-dma.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/include/mach/imx-dma.h b/arch/arm/mach-imx/include/mach/imx-dma.h new file mode 100644 index 00000000000..44d89c35539 --- /dev/null +++ b/arch/arm/mach-imx/include/mach/imx-dma.h @@ -0,0 +1,94 @@ +/* + * 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 <asm/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; + dmamode_t 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; + +int +imx_dma_setup_single(imx_dmach_t dma_ch, dma_addr_t dma_address, + unsigned int dma_length, unsigned int dev_addr, dmamode_t 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, dmamode_t 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 */ |