| Pavel Pisa | 999331a | 2006-04-02 16:58:37 +0100 | [diff] [blame] | 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 | |
| 46 | struct imx_dma_channel { |
| 47 | const char *name; |
| 48 | void (*irq_handler) (int, void *, struct pt_regs *); |
| 49 | void (*err_handler) (int, void *, struct pt_regs *); |
| 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 | |
| 59 | extern struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS]; |
| 60 | |
| 61 | |
| 62 | /* The type to distinguish channel numbers parameter from ordinal int type */ |
| 63 | typedef int imx_dmach_t; |
| 64 | |
| 65 | int |
| 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); |
| 68 | |
| 69 | int |
| 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); |
| 73 | |
| 74 | int |
| 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); |
| 78 | |
| 79 | void imx_dma_enable(imx_dmach_t dma_ch); |
| 80 | |
| 81 | void imx_dma_disable(imx_dmach_t dma_ch); |
| 82 | |
| 83 | int imx_dma_request(imx_dmach_t dma_ch, const char *name); |
| 84 | |
| 85 | void imx_dma_free(imx_dmach_t dma_ch); |
| 86 | |
| 87 | int imx_dma_request_by_prio(imx_dmach_t *pdma_ch, const char *name, imx_dma_prio prio); |
| 88 | |
| 89 | |
| 90 | #endif /* _ASM_ARCH_IMX_DMA_H */ |