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Diffstat (limited to 'include/asm-arm/arch-arm920t')
| -rw-r--r-- | include/asm-arm/arch-arm920t/memory.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/include/asm-arm/arch-arm920t/memory.h b/include/asm-arm/arch-arm920t/memory.h new file mode 100644 index 0000000..8a4e3f8 --- /dev/null +++ b/include/asm-arm/arch-arm920t/memory.h @@ -0,0 +1,162 @@ +/* + * linux/include/asm-arm/arch-s3c2400/memory.h by gj@denx.de + * based on + * linux/include/asm-arm/arch-sa1100/memory.h + * + * Copyright (c) 1999 Nicolas Pitre <nico@visuaide.com> + */ + +#ifndef __ASM_ARCH_MEMORY_H +#define __ASM_ARCH_MEMORY_H + + +/* + * Task size: 3GB + */ +#define TASK_SIZE (0xc0000000UL) +#define TASK_SIZE_26 (0x04000000UL) + +/* + * This decides where the kernel will search for a free chunk of vm + * space during mmap's. + */ +#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) + +/* + * Page offset: 3GB + */ +#define PAGE_OFFSET (0xc0000000UL) + +/* + * Physical DRAM offset is 0x0c000000 on the S3C2400 + */ +#define PHYS_OFFSET (0x0c000000UL) + +#include <linux/config.h> + + +/* Modified for S3C2400, by chc, 20010509 */ +#define RAM_IN_BANK_0 32*1024*1024 +#define RAM_IN_BANK_1 0 +#define RAM_IN_BANK_2 0 +#define RAM_IN_BANK_3 0 + +#define MEM_SIZE (RAM_IN_BANK_0+RAM_IN_BANK_1+RAM_IN_BANK_2+RAM_IN_BANK_3) + + +/* translation macros */ +#define __virt_to_phys__is_a_macro +#define __phys_to_virt__is_a_macro + +#if (RAM_IN_BANK_1 + RAM_IN_BANK_2 + RAM_IN_BANK_3 == 0) + +#define __virt_to_phys(x) ( (x) - PAGE_OFFSET + 0x0c000000 ) +#define __phys_to_virt(x) ( (x) - 0x0c000000 + PAGE_OFFSET ) + +#elif (RAM_IN_BANK_0 == RAM_IN_BANK_1) && \ + (RAM_IN_BANK_2 + RAM_IN_BANK_3 == 0) + +/* Two identical banks */ +#define __virt_to_phys(x) \ + ( ((x) < PAGE_OFFSET+RAM_IN_BANK_0) ? \ + ((x) - PAGE_OFFSET + _DRAMBnk0) : \ + ((x) - PAGE_OFFSET - RAM_IN_BANK_0 + _DRAMBnk1) ) +#define __phys_to_virt(x) \ + ( ((x)&0x07ffffff) + \ + (((x)&0x08000000) ? PAGE_OFFSET+RAM_IN_BANK_0 : PAGE_OFFSET) ) +#else + +/* It's more efficient for all other cases to use the function call */ +#undef __virt_to_phys__is_a_macro +#undef __phys_to_virt__is_a_macro +extern unsigned long __virt_to_phys(unsigned long vpage); +extern unsigned long __phys_to_virt(unsigned long ppage); + +#endif + +/* + * 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. + * + * On the SA1100, bus addresses are equivalent to physical addresses. + */ +#define __virt_to_bus__is_a_macro +#define __virt_to_bus(x) __virt_to_phys(x) +#define __bus_to_virt__is_a_macro +#define __bus_to_virt(x) __phys_to_virt(x) + + +#ifdef CONFIG_DISCONTIGMEM +#error "CONFIG_DISCONTIGMEM will not work on S3C2400" +/* + * 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 + */ + +#define NR_NODES 4 + +/* + * Given a kernel address, find the home node of the underlying memory. + */ +#define KVADDR_TO_NID(addr) \ + (((unsigned long)(addr) - 0xc0000000) >> 27) + +/* + * Given a physical address, convert it to a node id. + */ +#define PHYS_TO_NID(addr) KVADDR_TO_NID(__phys_to_virt(addr)) + +/* + * 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))) + +/* + * Given a kaddr, LOCAL_MEM_MAP 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(kvaddr) \ + (((unsigned long)(kvaddr) & 0x07ffffff) >> PAGE_SHIFT) + +/* + * Given a kaddr, virt_to_page returns a pointer to the corresponding + * mem_map entry. + */ +#define virt_to_page(kaddr) \ + (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) + +/* + * VALID_PAGE returns a non-zero value if given page pointer is valid. + * This assumes all node's mem_maps are stored within the node they refer to. + */ +#define VALID_PAGE(page) \ +({ unsigned int node = KVADDR_TO_NID(page); \ + ( (node < NR_NODES) && \ + ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size) ); \ +}) + +#else + +#define PHYS_TO_NID(addr) (0) + +#endif +#endif /* __ASM_ARCH_MEMORY_H */ |