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

   1 /*
   2  *  linux/include/asm-arm/arch-pxa/memory.h
   3  *
   4  * Author:      Nicolas Pitre
   5  * Copyright:   (C) 2001 MontaVista Software Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef __ASM_ARCH_MEMORY_H
  13 #define __ASM_ARCH_MEMORY_H
  14
  15 /*
  16  * Physical DRAM offset.
  17  */
  18 #define PHYS_OFFSET     (0xa0000000UL)
  19
  20 /*
  21  * Virtual view <-> DMA view memory address translations
  22  * virt_to_bus: Used to translate the virtual address to an
  23  *              address suitable to be passed to set_dma_addr
  24  * bus_to_virt: Used to convert an address for DMA operations
  25  *              to an address that the kernel can use.
  26  */
  27 #define __virt_to_bus(x)         __virt_to_phys(x)
  28 #define __bus_to_virt(x)         __phys_to_virt(x)
  29
  30 #ifdef CONFIG_DISCONTIGMEM
  31 /*
  32  * The nodes are matched with the physical SDRAM banks as follows:
  33  *
  34  *      node 0:  0xa0000000-0xa3ffffff  -->  0xc0000000-0xc3ffffff
  35  *      node 1:  0xa4000000-0xa7ffffff  -->  0xc4000000-0xc7ffffff
  36  *      node 2:  0xa8000000-0xabffffff  -->  0xc8000000-0xcbffffff
  37  *      node 3:  0xac000000-0xafffffff  -->  0xcc000000-0xcfffffff
  38  */
  39
  40 /*
  41  * Given a kernel address, find the home node of the underlying memory.
  42  */
  43 #define KVADDR_TO_NID(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> 26)
  44
  45 /*
  46  * Given a page frame number, convert it to a node id.
  47  */
  48 #define PFN_TO_NID(pfn)         (((pfn) - PHYS_PFN_OFFSET) >> (26 - PAGE_SHIFT))
  49
  50 /*
  51  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  52  * and returns the mem_map of that node.
  53  */
  54 #define ADDR_TO_MAPBASE(kaddr)  NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
  55
  56 /*
  57  * Given a page frame number, find the owning node of the memory
  58  * and returns the mem_map of that node.
  59  */
  60 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
  61
  62 /*
  63  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  64  * and returns the index corresponding to the appropriate page in the
  65  * node's mem_map.
  66  */
  67 #define LOCAL_MAP_NR(addr) \
  68         (((unsigned long)(addr) & 0x03ffffff) >> PAGE_SHIFT)
  69
  70 #else
  71
  72 #define PFN_TO_NID(addr)        (0)
  73
  74 #endif
  75
  76 #endif