c97c5aa83c
The RealView PBX board has two 512MB blocks of memory - one at 0x70000000 (with 256MB mirror at 0) and another at 0x20000000. Only the block at 0x70000000 (or the mirror at 0) may be used for DMA (e.g. framebuffer). This patch adds the sparsemem definitions to allow the use of all the memory split as follows: 256MB @ 0x00000000 (ZONE_DMA) 512MB @ 0x20000000 (ZONE_NORMAL) 256MB @ 0x80000000 (ZONE_NORMAL) Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
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* arch/arm/mach-realview/include/mach/memory.h
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*
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* Copyright (C) 2003 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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#ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
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#define PHYS_OFFSET UL(0x70000000)
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#else
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#define PHYS_OFFSET UL(0x00000000)
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#endif
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#if !defined(__ASSEMBLY__) && defined(CONFIG_ZONE_DMA)
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extern void realview_adjust_zones(int node, unsigned long *size,
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unsigned long *hole);
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#define arch_adjust_zones(node, size, hole) \
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realview_adjust_zones(node, size, hole)
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#define ISA_DMA_THRESHOLD (PHYS_OFFSET + SZ_256M - 1)
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#define MAX_DMA_ADDRESS (PAGE_OFFSET + SZ_256M)
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#endif
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#ifdef CONFIG_SPARSEMEM
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/*
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* Sparsemem definitions for RealView PBX.
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*
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* The RealView PBX board has another block of 512MB of RAM at 0x20000000,
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* however only the block at 0x70000000 (or the 256MB mirror at 0x00000000)
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* may be used for DMA.
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*
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* The macros below define a section size of 256MB and a non-linear virtual to
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* physical mapping:
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*
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* 256MB @ 0x00000000 -> PAGE_OFFSET
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* 512MB @ 0x20000000 -> PAGE_OFFSET + 0x10000000
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* 256MB @ 0x80000000 -> PAGE_OFFSET + 0x30000000
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*/
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#ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
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#error "SPARSEMEM not available with REALVIEW_HIGH_PHYS_OFFSET"
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#endif
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#define MAX_PHYSMEM_BITS 32
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#define SECTION_SIZE_BITS 28
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/* bank page offsets */
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#define PAGE_OFFSET1 (PAGE_OFFSET + 0x10000000)
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#define PAGE_OFFSET2 (PAGE_OFFSET + 0x30000000)
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#define __phys_to_virt(phys) \
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((phys) >= 0x80000000 ? (phys) - 0x80000000 + PAGE_OFFSET2 : \
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(phys) >= 0x20000000 ? (phys) - 0x20000000 + PAGE_OFFSET1 : \
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(phys) + PAGE_OFFSET)
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#define __virt_to_phys(virt) \
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((virt) >= PAGE_OFFSET2 ? (virt) - PAGE_OFFSET2 + 0x80000000 : \
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(virt) >= PAGE_OFFSET1 ? (virt) - PAGE_OFFSET1 + 0x20000000 : \
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(virt) - PAGE_OFFSET)
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#endif /* CONFIG_SPARSEMEM */
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#endif
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