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Diffstat (limited to 'include/asm-arm/arch-clps711x/memory.h')
| -rw-r--r-- | include/asm-arm/arch-clps711x/memory.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/include/asm-arm/arch-clps711x/memory.h b/include/asm-arm/arch-clps711x/memory.h new file mode 100644 index 000000000000..bd978947db42 --- /dev/null +++ b/include/asm-arm/arch-clps711x/memory.h @@ -0,0 +1,128 @@ +/* + * 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 + |