| 1 | /* |
| 2 | * Renesas SuperH DMA Engine support |
| 3 | * |
| 4 | * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> |
| 5 | * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. |
| 6 | * |
| 7 | * This is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | */ |
| 13 | #ifndef __DMA_SHDMA_H |
| 14 | #define __DMA_SHDMA_H |
| 15 | |
| 16 | #include <linux/sh_dma.h> |
| 17 | #include <linux/shdma-base.h> |
| 18 | #include <linux/dmaengine.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/list.h> |
| 21 | |
| 22 | #define SH_DMAE_MAX_CHANNELS 20 |
| 23 | #define SH_DMAE_TCR_MAX 0x00FFFFFF /* 16MB */ |
| 24 | |
| 25 | struct device; |
| 26 | |
| 27 | struct sh_dmae_chan { |
| 28 | struct shdma_chan shdma_chan; |
| 29 | const struct sh_dmae_slave_config *config; /* Slave DMA configuration */ |
| 30 | int xmit_shift; /* log_2(bytes_per_xfer) */ |
| 31 | void __iomem *base; |
| 32 | char dev_id[16]; /* unique name per DMAC of channel */ |
| 33 | int pm_error; |
| 34 | dma_addr_t slave_addr; |
| 35 | }; |
| 36 | |
| 37 | struct sh_dmae_device { |
| 38 | struct shdma_dev shdma_dev; |
| 39 | struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS]; |
| 40 | const struct sh_dmae_pdata *pdata; |
| 41 | struct list_head node; |
| 42 | void __iomem *chan_reg; |
| 43 | void __iomem *dmars; |
| 44 | unsigned int chcr_offset; |
| 45 | u32 chcr_ie_bit; |
| 46 | }; |
| 47 | |
| 48 | struct sh_dmae_regs { |
| 49 | u32 sar; /* SAR / source address */ |
| 50 | u32 dar; /* DAR / destination address */ |
| 51 | u32 tcr; /* TCR / transfer count */ |
| 52 | }; |
| 53 | |
| 54 | struct sh_dmae_desc { |
| 55 | struct sh_dmae_regs hw; |
| 56 | struct shdma_desc shdma_desc; |
| 57 | }; |
| 58 | |
| 59 | #define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan) |
| 60 | #define to_sh_desc(lh) container_of(lh, struct sh_desc, node) |
| 61 | #define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx) |
| 62 | #define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\ |
| 63 | struct sh_dmae_device, shdma_dev.dma_dev) |
| 64 | |
| 65 | #ifdef CONFIG_SH_DMAE_R8A73A4 |
| 66 | extern const struct sh_dmae_pdata r8a73a4_dma_pdata; |
| 67 | #define r8a73a4_shdma_devid (&r8a73a4_dma_pdata) |
| 68 | #else |
| 69 | #define r8a73a4_shdma_devid NULL |
| 70 | #endif |
| 71 | |
| 72 | #endif /* __DMA_SHDMA_H */ |