| /* |
| * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * vineetg: Feb 2009 |
| * -For AA4 board, kernel to DMA address APIs |
| */ |
| |
| /* |
| * kernel addresses are 0x800_000 based, while Bus addr are 0 based |
| */ |
| |
| #ifndef __PLAT_DMA_ADDR_H |
| #define __PLAT_DMA_ADDR_H |
| |
| #include <linux/device.h> |
| |
| static inline unsigned long plat_dma_addr_to_kernel(struct device *dev, |
| dma_addr_t dma_addr) |
| { |
| return dma_addr + PAGE_OFFSET; |
| } |
| |
| static inline dma_addr_t plat_kernel_addr_to_dma(struct device *dev, void *ptr) |
| { |
| unsigned long addr = (unsigned long)ptr; |
| /* |
| * To Catch buggy drivers which can call DMA map API with kernel vaddr |
| * i.e. for buffers alloc via vmalloc or ioremap which are not |
| * gaurnateed to be PHY contiguous and hence unfit for DMA anyways. |
| * On ARC kernel virtual address is 0x7000_0000 to 0x7FFF_FFFF, so |
| * ideally we want to check this range here, but our implementation is |
| * better as it checks for even worse user virtual address as well. |
| */ |
| if (likely(addr >= PAGE_OFFSET)) |
| return addr - PAGE_OFFSET; |
| |
| BUG(); |
| return addr; |
| } |
| |
| #endif |
