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_SHDMA_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 */ 73