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/* include/asm-arm/arch-lh7a40x/memory.h
*
* Copyright (C) 2004 Coastal Environmental Systems
*
* 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.
*
*
* Refer to <file:Documentation/arm/Sharp-LH/SDRAM> for more information.
*
*/
#ifndef __ASM_ARCH_MEMORY_H
#define __ASM_ARCH_MEMORY_H
/*
* Physical DRAM offset.
*/
#define PHYS_OFFSET (0xc0000000UL)
/*
* Virtual view <-> DMA view memory address translations
* virt_to_bus: Used to translate the virtual address to an
* address suitable to be passed to set_dma_addr
* bus_to_virt: Used to convert an address for DMA operations
* to an address that the kernel can use.
*/
#define __virt_to_bus(x) __virt_to_phys(x)
#define __bus_to_virt(x) __phys_to_virt(x)
#ifdef CONFIG_DISCONTIGMEM
#define NODES_SHIFT 4 /* Up to 16 nodes */
/*
* Given a kernel address, find the home node of the underlying memory.
*/
# ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
# define KVADDR_TO_NID(addr) \
( ((((unsigned long) (addr) - PAGE_OFFSET) >> 24) & 1)\
| ((((unsigned long) (addr) - PAGE_OFFSET) >> 25) & ~1))
# else /* 2 banks per node */
# define KVADDR_TO_NID(addr) \
(((unsigned long) (addr) - PAGE_OFFSET) >> 26)
# endif
/*
* Given a page frame number, convert it to a node id.
*/
# ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
# define PFN_TO_NID(pfn) \
(((((pfn) - PHYS_PFN_OFFSET) >> (24 - PAGE_SHIFT)) & 1)\
| ((((pfn) - PHYS_PFN_OFFSET) >> (25 - PAGE_SHIFT)) & ~1))
# else /* 2 banks per node */
# define PFN_TO_NID(pfn) \
(((pfn) - PHYS_PFN_OFFSET) >> (26 - PAGE_SHIFT))
#endif
/*
* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
* and return the mem_map of that node.
*/
# define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
/*
* Given a page frame number, find the owning node of the memory
* and return the mem_map of that node.
*/
# define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
/*
* Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
* and returns the index corresponding to the appropriate page in the
* node's mem_map.
*/
# ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
# define LOCAL_MAP_NR(addr) \
(((unsigned long)(addr) & 0x003fffff) >> PAGE_SHIFT)
# else /* 2 banks per node */
# define LOCAL_MAP_NR(addr) \
(((unsigned long)(addr) & 0x01ffffff) >> PAGE_SHIFT)
# endif
#else
# define PFN_TO_NID(addr) (0)
#endif
#endif
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