128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/*
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* linux/include/asm-arm/arch-clps711x/memory.h
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*
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* Copyright (C) 1999 ARM Limited
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __ASM_ARCH_MEMORY_H
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#define __ASM_ARCH_MEMORY_H
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/*
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* Physical DRAM offset.
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*/
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#define PHYS_OFFSET UL(0xc0000000)
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/*
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* Virtual view <-> DMA view memory address translations
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* virt_to_bus: Used to translate the virtual address to an
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* address suitable to be passed to set_dma_addr
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* bus_to_virt: Used to convert an address for DMA operations
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* to an address that the kernel can use.
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*/
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#if defined(CONFIG_ARCH_CDB89712)
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#define __virt_to_bus(x) (x)
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#define __bus_to_virt(x) (x)
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#elif defined (CONFIG_ARCH_AUTCPU12)
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#define __virt_to_bus(x) (x)
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#define __bus_to_virt(x) (x)
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#else
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#define __virt_to_bus(x) ((x) - PAGE_OFFSET)
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#define __bus_to_virt(x) ((x) + PAGE_OFFSET)
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#endif
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/*
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* Like the SA1100, the EDB7211 has a large gap between physical RAM
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* banks. In 2.2, the Psion (CL-PS7110) port added custom support for
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* discontiguous physical memory. In 2.4, we can use the standard
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* Linux NUMA support.
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*
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* This is not necessary for EP7211 implementations with only one used
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* memory bank. For those systems, simply undefine CONFIG_DISCONTIGMEM.
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*/
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#ifdef CONFIG_DISCONTIGMEM
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/*
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* Because of the wide memory address space between physical RAM banks on the
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* SA1100, it's much more convenient to use Linux's NUMA support to implement
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* our memory map representation. Assuming all memory nodes have equal access
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* characteristics, we then have generic discontiguous memory support.
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*
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* Of course, all this isn't mandatory for SA1100 implementations with only
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* one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
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*
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* The nodes are matched with the physical memory bank addresses which are
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* incidentally the same as virtual addresses.
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*
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* node 0: 0xc0000000 - 0xc7ffffff
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* node 1: 0xc8000000 - 0xcfffffff
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* node 2: 0xd0000000 - 0xd7ffffff
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* node 3: 0xd8000000 - 0xdfffffff
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*/
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/*
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* Given a kernel address, find the home node of the underlying memory.
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*/
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#define KVADDR_TO_NID(addr) \
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(((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)
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/*
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* Given a page frame number, convert it to a node id.
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*/
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#define PFN_TO_NID(pfn) \
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(((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT))
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/*
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* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
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* and returns the mem_map of that node.
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*/
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#define ADDR_TO_MAPBASE(kaddr) \
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NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
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#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
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/*
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* Given a kaddr, LOCAL_MAR_NR finds the owning node of the memory
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* and returns the index corresponding to the appropriate page in the
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* node's mem_map.
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*/
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#define LOCAL_MAP_NR(addr) \
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(((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)
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/*
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* The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211
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* uses only one of the two banks (bank #1). However, even within
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* bank #1, memory is discontiguous.
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*
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* The EDB7211 has two 8MB DRAM areas with 8MB of empty space between
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* them, so we use 24 for the node max shift to get 16MB node sizes.
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*/
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#define NODE_MAX_MEM_SHIFT 24
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#define NODE_MAX_MEM_SIZE (1<<NODE_MAX_MEM_SHIFT)
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#endif /* CONFIG_DISCONTIGMEM */
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#endif
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