f09b997999
Patch from Nicolas Pitre This patch allows for assorted type of cleanups by letting assembly code use the same set of defines for constant values and avoid duplicated definitions that might not always be in sync, or that might simply be confusing due to the different names for the same thing. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
129 lines
3.9 KiB
C
129 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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#include <linux/config.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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