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 #define NODES_SHIFT     4       /* Up to 16 nodes */
  35
  36 /*
  37  * Given a kernel address, find the home node of the underlying memory.
  38  */
  39
  40 # ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
  41 #  define KVADDR_TO_NID(addr) \
  42   (  ((((unsigned long) (addr) - PAGE_OFFSET) >> 24) &  1)\
  43    | ((((unsigned long) (addr) - PAGE_OFFSET) >> 25) & ~1))
  44 # else  /* 2 banks per node */
  45 #  define KVADDR_TO_NID(addr) \
  46       (((unsigned long) (addr) - PAGE_OFFSET) >> 26)
  47 # endif
  48
  49 /*
  50  * Given a page frame number, convert it to a node id.
  51  */
  52
  53 # ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
  54 #  define PFN_TO_NID(pfn) \
  55   (((((pfn) - PHYS_PFN_OFFSET) >> (24 - PAGE_SHIFT)) &  1)\
  56  | ((((pfn) - PHYS_PFN_OFFSET) >> (25 - PAGE_SHIFT)) & ~1))
  57 # else  /* 2 banks per node */
  58 #  define PFN_TO_NID(pfn) \
  59     (((pfn) - PHYS_PFN_OFFSET) >> (26 - PAGE_SHIFT))
  60 #endif
  61
  62 /*
  63  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  64  * and return the mem_map of that node.
  65  */
  66 # define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
  67
  68 /*
  69  * Given a page frame number, find the owning node of the memory
  70  * and return the mem_map of that node.
  71  */
  72 # define PFN_TO_MAPBASE(pfn)    NODE_MEM_MAP(PFN_TO_NID(pfn))
  73
  74 /*
  75  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  76  * and returns the index corresponding to the appropriate page in the
  77  * node's mem_map.
  78  */
  79
  80 # ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
  81 #  define LOCAL_MAP_NR(addr) \
  82        (((unsigned long)(addr) & 0x003fffff) >> PAGE_SHIFT)
  83 # else  /* 2 banks per node */
  84 #  define LOCAL_MAP_NR(addr) \
  85        (((unsigned long)(addr) & 0x01ffffff) >> PAGE_SHIFT)
  86 # endif
  87
  88 #else
  89
  90 # define PFN_TO_NID(addr)       (0)
  91
  92 #endif
  93
  94 #endif