b5ee900258
Let's provide an overridable default instead of having every machine class define __virt_to_bus and __bus_to_virt to the same thing. What most platforms are using is bus_addr == phys_addr so such is the default. One exception is ebsa110 which has no DMA what so ever, so the actual definition is not important except only for proper compilation. Also added a comment about the special footbridge bus translation. Let's also remove comments alluding to set_dma_addr which is not (and should not) be commonly used. Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/*
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* arch/arm/mach-clps711x/include/mach/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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#if !defined(CONFIG_ARCH_CDB89712) && !defined (CONFIG_ARCH_AUTCPU12)
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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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/*
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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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/*
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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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#define NODE_MEM_SIZE_BITS 24
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#define SECTION_SIZE_BITS 24
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#define MAX_PHYSMEM_BITS 32
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#endif
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