/*
* linux/include/asm-arm/arch-clps711x/memory.h
*
* Copyright (C) 1999 ARM Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __ASM_ARCH_MEMORY_H
#define __ASM_ARCH_MEMORY_H
#include <linux/config.h>
/*
* Physical DRAM offset.
*/
#define PHYS_OFFSET (0xc0000000UL)
/*
* Virtual view <-> DMA view memory address translations
* virt_to_bus: Used to translate the virtual address to an
* address suitable to be passed to set_dma_addr
* bus_to_virt: Used to convert an address for DMA operations
* to an address that the kernel can use.
*/
#if defined(CONFIG_ARCH_CDB89712)
#define __virt_to_bus(x) (x)
#define __bus_to_virt(x) (x)
#elif defined (CONFIG_ARCH_AUTCPU12)
#define __virt_to_bus(x) (x)
#define __bus_to_virt(x) (x)
#else
#define __virt_to_bus(x) ((x) - PAGE_OFFSET)
#define __bus_to_virt(x) ((x) + PAGE_OFFSET)
#endif
/*
* Like the SA1100, the EDB7211 has a large gap between physical RAM
* banks. In 2.2, the Psion (CL-PS7110) port added custom support for
* discontiguous physical memory. In 2.4, we can use the standard
* Linux NUMA support.
*
* This is not necessary for EP7211 implementations with only one used
* memory bank. For those systems, simply undefine CONFIG_DISCONTIGMEM.
*/
#ifdef CONFIG_DISCONTIGMEM
/*
* Because of the wide memory address space between physical RAM banks on the
* SA1100, it's much more convenient to use Linux's NUMA support to implement
* our memory map representation. Assuming all memory nodes have equal access
* characteristics, we then have generic discontiguous memory support.
*
* Of course, all this isn't mandatory for SA1100 implementations with only
* one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
*
* The nodes are matched with the physical memory bank addresses which are
* incidentally the same as virtual addresses.
*
* node 0: 0xc0000000 - 0xc7ffffff
* node 1: 0xc8000000 - 0xcfffffff
* node 2: 0xd0000000 - 0xd7ffffff
* node 3: 0xd8000000 - 0xdfffffff
*/
/*
* Given a kernel address, find the home node of the underlying memory.
*/
#define KVADDR_TO_NID(addr) \
(((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)
/*
* Given a page frame number, convert it to a node id.
*/
#define PFN_TO_NID(pfn) \
(((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT))
/*
* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
* and returns the mem_map of that node.
*/
#define ADDR_TO_MAPBASE(kaddr) \
NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
/*
* Given a kaddr, LOCAL_MAR_NR finds the owning node of the memory
* and returns the index corresponding to the appropriate page in the
* node's mem_map.
*/
#define LOCAL_MAP_NR(addr) \
(((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)
/*
* The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211
* uses only one of the two banks (bank #1). However, even within
* bank #1, memory is discontiguous.
*
* The EDB7211 has two 8MB DRAM areas with 8MB of empty space between
* them, so we use 24 for the node max shift to get 16MB node sizes.
*/
#define NODE_MAX_MEM_SHIFT 24
#define NODE_MAX_MEM_SIZE (1<<NODE_MAX_MEM_SHIFT)
#endif /* CONFIG_DISCONTIGMEM */
#endif
