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 <asm/sizes.h>
  11
  12 /*
  13  * Physical DRAM offset is 0xc0000000 on the SA1100
  14  */
  15 #define PHYS_OFFSET     UL(0xc0000000)
  16
  17 #ifndef __ASSEMBLY__
  18
  19 #ifdef CONFIG_SA1111
  20 void sa1111_adjust_zones(int node, unsigned long *size, unsigned long *holes);
  21
  22 #define arch_adjust_zones(node, size, holes) \
  23         sa1111_adjust_zones(node, size, holes)
  24
  25 #define ISA_DMA_THRESHOLD       (PHYS_OFFSET + SZ_1M - 1)
  26
  27 #endif
  28 #endif
  29
  30 /*
  31  * Virtual view <-> DMA view memory address translations
  32  * virt_to_bus: Used to translate the virtual address to an
  33  *              address suitable to be passed to set_dma_addr
  34  * bus_to_virt: Used to convert an address for DMA operations
  35  *              to an address that the kernel can use.
  36  *
  37  * On the SA1100, bus addresses are equivalent to physical addresses.
  38  */
  39 #define __virt_to_bus(x)         __virt_to_phys(x)
  40 #define __bus_to_virt(x)         __phys_to_virt(x)
  41
  42 #ifdef CONFIG_DISCONTIGMEM
  43 /*
  44  * Because of the wide memory address space between physical RAM banks on the
  45  * SA1100, it's much convenient to use Linux's NUMA support to implement our
  46  * memory map representation.  Assuming all memory nodes have equal access
  47  * characteristics, we then have generic discontiguous memory support.
  48  *
  49  * Of course, all this isn't mandatory for SA1100 implementations with only
  50  * one used memory bank.  For those, simply undefine CONFIG_DISCONTIGMEM.
  51  *
  52  * The nodes are matched with the physical memory bank addresses which are
  53  * incidentally the same as virtual addresses.
  54  *
  55  *      node 0:  0xc0000000 - 0xc7ffffff
  56  *      node 1:  0xc8000000 - 0xcfffffff
  57  *      node 2:  0xd0000000 - 0xd7ffffff
  58  *      node 3:  0xd8000000 - 0xdfffffff
  59  */
  60
  61 /*
  62  * Given a kernel address, find the home node of the underlying memory.
  63  */
  64 #define KVADDR_TO_NID(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> 27)
  65
  66 /*
  67  * Given a page frame number, convert it to a node id.
  68  */
  69 #define PFN_TO_NID(pfn)         (((pfn) - PHYS_PFN_OFFSET) >> (27 - PAGE_SHIFT))
  70
  71 /*
  72  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  73  * and return the mem_map of that node.
  74  */
  75 #define ADDR_TO_MAPBASE(kaddr)  NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
  76
  77 /*
  78  * Given a page frame number, find the owning node of the memory
  79  * and return the mem_map of that node.
  80  */
  81 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
  82
  83 /*
  84  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  85  * and returns the index corresponding to the appropriate page in the
  86  * node's mem_map.
  87  */
  88 #define LOCAL_MAP_NR(addr) \
  89         (((unsigned long)(addr) & 0x07ffffff) >> PAGE_SHIFT)
  90
  91 #endif
  92
  93 /*
  94  * Cache flushing area - SA1100 zero bank
  95  */
  96 #define FLUSH_BASE_PHYS         0xe0000000
  97 #define FLUSH_BASE              0xf5000000
  98 #define FLUSH_BASE_MINICACHE    0xf5100000
  99
 100 #endif