include/asm-arm/arch-sa1100/memory.h

   1 /*
   2  * linux/include/asm-arm/arch-sa1100/memory.h
   3  *
   4  * Copyright (C) 1999-2000 Nicolas Pitre <nico@cam.org>
   5  */
   6
   7 #ifndef __ASM_ARCH_MEMORY_H
   8 #define __ASM_ARCH_MEMORY_H
   9
  10 #include <linux/config.h>
  11 #include <asm/sizes.h>
  12
  13 /*
  14  * Physical DRAM offset is 0xc0000000 on the SA1100
  15  */
  16 #define PHYS_OFFSET     UL(0xc0000000)
  17
  18 #ifndef __ASSEMBLY__
  19
  20 #ifdef CONFIG_SA1111
  21 void sa1111_adjust_zones(int node, unsigned long *size, unsigned long *holes);
  22
  23 #define arch_adjust_zones(node, size, holes) \
  24         sa1111_adjust_zones(node, size, holes)
  25
  26 #define ISA_DMA_THRESHOLD       (PHYS_OFFSET + SZ_1M - 1)
  27
  28 #endif
  29 #endif
  30
  31 /*
  32  * Virtual view <-> DMA view memory address translations
  33  * virt_to_bus: Used to translate the virtual address to an
  34  *              address suitable to be passed to set_dma_addr
  35  * bus_to_virt: Used to convert an address for DMA operations
  36  *              to an address that the kernel can use.
  37  *
  38  * On the SA1100, bus addresses are equivalent to physical addresses.
  39  */
  40 #define __virt_to_bus(x)         __virt_to_phys(x)
  41 #define __bus_to_virt(x)         __phys_to_virt(x)
  42
  43 #ifdef CONFIG_DISCONTIGMEM
  44 /*
  45  * Because of the wide memory address space between physical RAM banks on the
  46  * SA1100, it's much convenient to use Linux's NUMA support to implement our
  47  * memory map representation.  Assuming all memory nodes have equal access
  48  * characteristics, we then have generic discontiguous memory support.
  49  *
  50  * Of course, all this isn't mandatory for SA1100 implementations with only
  51  * one used memory bank.  For those, simply undefine CONFIG_DISCONTIGMEM.
  52  *
  53  * The nodes are matched with the physical memory bank addresses which are
  54  * incidentally the same as virtual addresses.
  55  *
  56  *      node 0:  0xc0000000 - 0xc7ffffff
  57  *      node 1:  0xc8000000 - 0xcfffffff
  58  *      node 2:  0xd0000000 - 0xd7ffffff
  59  *      node 3:  0xd8000000 - 0xdfffffff
  60  */
  61
  62 /*
  63  * Given a kernel address, find the home node of the underlying memory.
  64  */
  65 #define KVADDR_TO_NID(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> 27)
  66
  67 /*
  68  * Given a page frame number, convert it to a node id.
  69  */
  70 #define PFN_TO_NID(pfn)         (((pfn) - PHYS_PFN_OFFSET) >> (27 - PAGE_SHIFT))
  71
  72 /*
  73  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  74  * and return the mem_map of that node.
  75  */
  76 #define ADDR_TO_MAPBASE(kaddr)  NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
  77
  78 /*
  79  * Given a page frame number, find the owning node of the memory
  80  * and return the mem_map of that node.
  81  */
  82 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
  83
  84 /*
  85  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  86  * and returns the index corresponding to the appropriate page in the
  87  * node's mem_map.
  88  */
  89 #define LOCAL_MAP_NR(addr) \
  90         (((unsigned long)(addr) & 0x07ffffff) >> PAGE_SHIFT)
  91
  92 #endif
  93
  94 #endif