x86: i8259A: remove redundant irq_descinitialization
[wrt350n-kernel.git] / include / asm-mips / mach-ip32 / dma-coherence.h
bloba5511ebb2d5323d62cfb6df084dd77bfc5f1a70f
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
6 * Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
8 */
9 #ifndef __ASM_MACH_IP32_DMA_COHERENCE_H
10 #define __ASM_MACH_IP32_DMA_COHERENCE_H
12 #include <asm/ip32/crime.h>
14 struct device;
17 * Few notes.
18 * 1. CPU sees memory as two chunks: 0-256M@0x0, and the rest @0x40000000+256M
19 * 2. PCI sees memory as one big chunk @0x0 (or we could use 0x40000000 for
20 * native-endian)
21 * 3. All other devices see memory as one big chunk at 0x40000000
22 * 4. Non-PCI devices will pass NULL as struct device*
24 * Thus we translate differently, depending on device.
27 #define RAM_OFFSET_MASK 0x3fffffffUL
29 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
30 size_t size)
32 dma_addr_t pa = virt_to_phys(addr) & RAM_OFFSET_MASK;
34 if (dev == NULL)
35 pa += CRIME_HI_MEM_BASE;
37 return pa;
40 static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
42 dma_addr_t pa;
44 pa = page_to_phys(page) & RAM_OFFSET_MASK;
46 if (dev == NULL)
47 pa += CRIME_HI_MEM_BASE;
49 return pa;
52 /* This is almost certainly wrong but it's what dma-ip32.c used to use */
53 static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
55 unsigned long addr = dma_addr & RAM_OFFSET_MASK;
57 if (dma_addr >= 256*1024*1024)
58 addr += CRIME_HI_MEM_BASE;
60 return addr;
63 static inline void plat_unmap_dma_mem(dma_addr_t dma_addr)
67 static inline int plat_device_is_coherent(struct device *dev)
69 return 0; /* IP32 is non-cohernet */
72 #endif /* __ASM_MACH_IP32_DMA_COHERENCE_H */