1/* include/asm-arm/arch-lh7a40x/memory.h 2 * 3 * Copyright (C) 2004 Coastal Environmental Systems 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License 7 * version 2 as published by the Free Software Foundation. 8 * 9 * 10 * Refer to <file:Documentation/arm/Sharp-LH/SDRAM> for more information. 11 * 12 */ 13 14#ifndef __ASM_ARCH_MEMORY_H 15#define __ASM_ARCH_MEMORY_H 16 17/* 18 * Physical DRAM offset. 19 */ 20#define PHYS_OFFSET UL(0xc0000000) 21 22/* 23 * Virtual view <-> DMA view memory address translations 24 * virt_to_bus: Used to translate the virtual address to an 25 * address suitable to be passed to set_dma_addr 26 * bus_to_virt: Used to convert an address for DMA operations 27 * to an address that the kernel can use. 28 */ 29#define __virt_to_bus(x) __virt_to_phys(x) 30#define __bus_to_virt(x) __phys_to_virt(x) 31 32#ifdef CONFIG_DISCONTIGMEM 33 34/* 35 * Given a kernel address, find the home node of the underlying memory. 36 */ 37 38# ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE 39# define KVADDR_TO_NID(addr) \ 40 ( ((((unsigned long) (addr) - PAGE_OFFSET) >> 24) & 1)\ 41 | ((((unsigned long) (addr) - PAGE_OFFSET) >> 25) & ~1)) 42# else /* 2 banks per node */ 43# define KVADDR_TO_NID(addr) \ 44 (((unsigned long) (addr) - PAGE_OFFSET) >> 26) 45# endif 46 47/* 48 * Given a page frame number, convert it to a node id. 49 */ 50 51# ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE 52# define PFN_TO_NID(pfn) \ 53 (((((pfn) - PHYS_PFN_OFFSET) >> (24 - PAGE_SHIFT)) & 1)\ 54 | ((((pfn) - PHYS_PFN_OFFSET) >> (25 - PAGE_SHIFT)) & ~1)) 55# else /* 2 banks per node */ 56# define PFN_TO_NID(pfn) \ 57 (((pfn) - PHYS_PFN_OFFSET) >> (26 - PAGE_SHIFT)) 58#endif 59 60/* 61 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory 62 * and returns the index corresponding to the appropriate page in the 63 * node's mem_map. 64 */ 65 66# ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE 67# define LOCAL_MAP_NR(addr) \ 68 (((unsigned long)(addr) & 0x003fffff) >> PAGE_SHIFT) 69# else /* 2 banks per node */ 70# define LOCAL_MAP_NR(addr) \ 71 (((unsigned long)(addr) & 0x01ffffff) >> PAGE_SHIFT) 72# endif 73 74#endif 75 76#endif 77