| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org> |
| * |
| */ |
| #ifndef __ASM_MACH_IP32_DMA_COHERENCE_H |
| #define __ASM_MACH_IP32_DMA_COHERENCE_H |
| |
| #include <asm/ip32/crime.h> |
| |
| struct device; |
| |
| /* |
| * Few notes. |
| * 1. CPU sees memory as two chunks: 0-256M@0x0, and the rest @0x40000000+256M |
| * 2. PCI sees memory as one big chunk @0x0 (or we could use 0x40000000 for |
| * native-endian) |
| * 3. All other devices see memory as one big chunk at 0x40000000 |
| * 4. Non-PCI devices will pass NULL as struct device* |
| * |
| * Thus we translate differently, depending on device. |
| */ |
| |
| #define RAM_OFFSET_MASK 0x3fffffffUL |
| |
| static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, |
| size_t size) |
| { |
| dma_addr_t pa = virt_to_phys(addr) & RAM_OFFSET_MASK; |
| |
| if (dev == NULL) |
| pa += CRIME_HI_MEM_BASE; |
| |
| return pa; |
| } |
| |
| static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page) |
| { |
| dma_addr_t pa; |
| |
| pa = page_to_phys(page) & RAM_OFFSET_MASK; |
| |
| if (dev == NULL) |
| pa += CRIME_HI_MEM_BASE; |
| |
| return pa; |
| } |
| |
| /* This is almost certainly wrong but it's what dma-ip32.c used to use */ |
| static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr) |
| { |
| unsigned long addr = dma_addr & RAM_OFFSET_MASK; |
| |
| if (dma_addr >= 256*1024*1024) |
| addr += CRIME_HI_MEM_BASE; |
| |
| return addr; |
| } |
| |
| static inline void plat_unmap_dma_mem(dma_addr_t dma_addr) |
| { |
| } |
| |
| static inline int plat_device_is_coherent(struct device *dev) |
| { |
| return 0; /* IP32 is non-cohernet */ |
| } |
| |
| #endif /* __ASM_MACH_IP32_DMA_COHERENCE_H */ |