include/asm-arm/arch-lh7a40x/memory.h

   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     (0xc0000000UL)
  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, ADDR_TO_MAPBASE finds the owning node of the memory
  62  * and return the mem_map of that node.
  63  */
  64 # define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
  65
  66 /*
  67  * Given a page frame number, find the owning node of the memory
  68  * and return the mem_map of that node.
  69  */
  70 # define PFN_TO_MAPBASE(pfn)    NODE_MEM_MAP(PFN_TO_NID(pfn))
  71
  72 /*
  73  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  74  * and returns the index corresponding to the appropriate page in the
  75  * node's mem_map.
  76  */
  77
  78 # ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
  79 #  define LOCAL_MAP_NR(addr) \
  80        (((unsigned long)(addr) & 0x003fffff) >> PAGE_SHIFT)
  81 # else  /* 2 banks per node */
  82 #  define LOCAL_MAP_NR(addr) \
  83        (((unsigned long)(addr) & 0x01ffffff) >> PAGE_SHIFT)
  84 # endif
  85
  86 #else
  87
  88 # define PFN_TO_NID(addr)       (0)
  89
  90 #endif
  91
  92 #endif