git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 9a88cbb5 RB |
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. | |
| 5 | * | |
| 6 | * Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org> | |
| 7 | * | |
| 8 | */ | |
| 9 | #ifndef __ASM_MACH_IP35_DMA_COHERENCE_H | |
| 10 | #define __ASM_MACH_IP35_DMA_COHERENCE_H | |
| 11 | ||
| 12 | #include <asm/ip32/crime.h> | |
| 13 | ||
| 14 | struct device; | |
| 15 | ||
| 16 | /* | |
| 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* | |
| 23 | * | |
| 24 | * Thus we translate differently, depending on device. | |
| 25 | */ | |
| 26 | ||
| 27 | #define RAM_OFFSET_MASK 0x3fffffffUL | |
| 28 | ||
| 29 | static dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size) | |
| 30 | { | |
| 31 | dma_addr_t pa = virt_to_phys(addr) & RAM_OFFSET_MASK; | |
| 32 | ||
| 33 | if (dev == NULL) | |
| 34 | pa += CRIME_HI_MEM_BASE; | |
| 35 | ||
| 36 | return pa; | |
| 37 | } | |
| 38 | ||
| 39 | static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page) | |
| 40 | { | |
| 41 | dma_addr_t pa; | |
| 42 | ||
| 43 | pa = page_to_phys(page) & RAM_OFFSET_MASK; | |
| 44 | ||
| 45 | if (dev == NULL) | |
| 46 | pa += CRIME_HI_MEM_BASE; | |
| 47 | ||
| 48 | return pa; | |
| 49 | } | |
| 50 | ||
| 51 | /* This is almost certainly wrong but it's what dma-ip32.c used to use */ | |
| 52 | static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr) | |
| 53 | { | |
| 54 | unsigned long addr = dma_addr & RAM_OFFSET_MASK; | |
| 55 | ||
| 56 | if (dma_addr >= 256*1024*1024) | |
| 57 | addr += CRIME_HI_MEM_BASE; | |
| 58 | ||
| 59 | return addr; | |
| 60 | } | |
| 61 | ||
| 62 | static void plat_unmap_dma_mem(dma_addr_t dma_addr) | |
| 63 | { | |
| 64 | } | |
| 65 | ||
| 66 | static inline int plat_device_is_coherent(struct device *dev) | |
| 67 | { | |
| 68 | return 0; /* IP32 is non-cohernet */ | |
| 69 | } | |
| 70 | ||
| 71 | #endif /* __ASM_MACH_IP35_DMA_COHERENCE_H */ |