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

   1 /* arch/arm/mach-lh7a40x/include/mach/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 #ifdef CONFIG_DISCONTIGMEM
  23
  24 /*
  25  * Given a kernel address, find the home node of the underlying memory.
  26  */
  27
  28 # ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
  29 #  define KVADDR_TO_NID(addr) \
  30   (  ((((unsigned long) (addr) - PAGE_OFFSET) >> 24) &  1)\
  31    | ((((unsigned long) (addr) - PAGE_OFFSET) >> 25) & ~1))
  32 # else  /* 2 banks per node */
  33 #  define KVADDR_TO_NID(addr) \
  34       (((unsigned long) (addr) - PAGE_OFFSET) >> 26)
  35 # endif
  36
  37 /*
  38  * Given a page frame number, convert it to a node id.
  39  */
  40
  41 # ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
  42 #  define PFN_TO_NID(pfn) \
  43   (((((pfn) - PHYS_PFN_OFFSET) >> (24 - PAGE_SHIFT)) &  1)\
  44  | ((((pfn) - PHYS_PFN_OFFSET) >> (25 - PAGE_SHIFT)) & ~1))
  45 # else  /* 2 banks per node */
  46 #  define PFN_TO_NID(pfn) \
  47     (((pfn) - PHYS_PFN_OFFSET) >> (26 - PAGE_SHIFT))
  48 #endif
  49
  50 /*
  51  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  52  * and returns the index corresponding to the appropriate page in the
  53  * node's mem_map.
  54  */
  55
  56 # ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
  57 #  define LOCAL_MAP_NR(addr) \
  58        (((unsigned long)(addr) & 0x003fffff) >> PAGE_SHIFT)
  59 # else  /* 2 banks per node */
  60 #  define LOCAL_MAP_NR(addr) \
  61        (((unsigned long)(addr) & 0x01ffffff) >> PAGE_SHIFT)
  62 # endif
  63
  64 #endif
  65
  66 /*
  67  * Sparsemem version of the above
  68  */
  69 #define MAX_PHYSMEM_BITS        32
  70 #define SECTION_SIZE_BITS       24
  71
  72 #endif