1/* 2 * linux/arch/arm/mm/arm740.S: utility functions for ARM740 3 * 4 * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com) 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 */ 11#include <linux/linkage.h> 12#include <linux/init.h> 13#include <asm/assembler.h> 14#include <asm/asm-offsets.h> 15#include <asm/hwcap.h> 16#include <asm/pgtable-hwdef.h> 17#include <asm/pgtable.h> 18#include <asm/ptrace.h> 19 20 .text 21/* 22 * cpu_arm740_proc_init() 23 * cpu_arm740_do_idle() 24 * cpu_arm740_dcache_clean_area() 25 * cpu_arm740_switch_mm() 26 * 27 * These are not required. 28 */ 29ENTRY(cpu_arm740_proc_init) 30ENTRY(cpu_arm740_do_idle) 31ENTRY(cpu_arm740_dcache_clean_area) 32ENTRY(cpu_arm740_switch_mm) 33 mov pc, lr 34 35/* 36 * cpu_arm740_proc_fin() 37 */ 38ENTRY(cpu_arm740_proc_fin) 39 mrc p15, 0, r0, c1, c0, 0 40 bic r0, r0, #0x3f000000 @ bank/f/lock/s 41 bic r0, r0, #0x0000000c @ w-buffer/cache 42 mcr p15, 0, r0, c1, c0, 0 @ disable caches 43 mov pc, lr 44 45/* 46 * cpu_arm740_reset(loc) 47 * Params : r0 = address to jump to 48 * Notes : This sets up everything for a reset 49 */ 50ENTRY(cpu_arm740_reset) 51 mov ip, #0 52 mcr p15, 0, ip, c7, c0, 0 @ invalidate cache 53 mrc p15, 0, ip, c1, c0, 0 @ get ctrl register 54 bic ip, ip, #0x0000000c @ ............wc.. 55 mcr p15, 0, ip, c1, c0, 0 @ ctrl register 56 mov pc, r0 57 58 __INIT 59 60 .type __arm740_setup, #function 61__arm740_setup: 62 mov r0, #0 63 mcr p15, 0, r0, c7, c0, 0 @ invalidate caches 64 65 mcr p15, 0, r0, c6, c3 @ disable area 3~7 66 mcr p15, 0, r0, c6, c4 67 mcr p15, 0, r0, c6, c5 68 mcr p15, 0, r0, c6, c6 69 mcr p15, 0, r0, c6, c7 70 71 mov r0, #0x0000003F @ base = 0, size = 4GB 72 mcr p15, 0, r0, c6, c0 @ set area 0, default 73 74 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM 75 ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB) 76 mov r2, #10 @ 11 is the minimum (4KB) 771: add r2, r2, #1 @ area size *= 2 78 mov r1, r1, lsr #1 79 bne 1b @ count not zero r-shift 80 orr r0, r0, r2, lsl #1 @ the area register value 81 orr r0, r0, #1 @ set enable bit 82 mcr p15, 0, r0, c6, c1 @ set area 1, RAM 83 84 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH 85 ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB) 86 mov r2, #10 @ 11 is the minimum (4KB) 871: add r2, r2, #1 @ area size *= 2 88 mov r1, r1, lsr #1 89 bne 1b @ count not zero r-shift 90 orr r0, r0, r2, lsl #1 @ the area register value 91 orr r0, r0, #1 @ set enable bit 92 mcr p15, 0, r0, c6, c2 @ set area 2, ROM/FLASH 93 94 mov r0, #0x06 95 mcr p15, 0, r0, c2, c0 @ Region 1&2 cacheable 96#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 97 mov r0, #0x00 @ disable whole write buffer 98#else 99 mov r0, #0x02 @ Region 1 write bufferred 100#endif 101 mcr p15, 0, r0, c3, c0 102 103 mov r0, #0x10000 104 sub r0, r0, #1 @ r0 = 0xffff 105 mcr p15, 0, r0, c5, c0 @ all read/write access 106 107 mrc p15, 0, r0, c1, c0 @ get control register 108 bic r0, r0, #0x3F000000 @ set to standard caching mode 109 @ need some benchmark 110 orr r0, r0, #0x0000000d @ MPU/Cache/WB 111 112 mov pc, lr 113 114 .size __arm740_setup, . - __arm740_setup 115 116 __INITDATA 117 118/* 119 * Purpose : Function pointers used to access above functions - all calls 120 * come through these 121 */ 122 .type arm740_processor_functions, #object 123ENTRY(arm740_processor_functions) 124 .word v4t_late_abort 125 .word legacy_pabort 126 .word cpu_arm740_proc_init 127 .word cpu_arm740_proc_fin 128 .word cpu_arm740_reset 129 .word cpu_arm740_do_idle 130 .word cpu_arm740_dcache_clean_area 131 .word cpu_arm740_switch_mm 132 .word 0 @ cpu_*_set_pte 133 .size arm740_processor_functions, . - arm740_processor_functions 134 135 .section ".rodata" 136 137 .type cpu_arch_name, #object 138cpu_arch_name: 139 .asciz "armv4" 140 .size cpu_arch_name, . - cpu_arch_name 141 142 .type cpu_elf_name, #object 143cpu_elf_name: 144 .asciz "v4" 145 .size cpu_elf_name, . - cpu_elf_name 146 147 .type cpu_arm740_name, #object 148cpu_arm740_name: 149 .ascii "ARM740T" 150 .size cpu_arm740_name, . - cpu_arm740_name 151 152 .align 153 154 .section ".proc.info.init", #alloc, #execinstr 155 .type __arm740_proc_info,#object 156__arm740_proc_info: 157 .long 0x41807400 158 .long 0xfffffff0 159 .long 0 160 b __arm740_setup 161 .long cpu_arch_name 162 .long cpu_elf_name 163 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT 164 .long cpu_arm740_name 165 .long arm740_processor_functions 166 .long 0 167 .long 0 168 .long v3_cache_fns @ cache model 169 .size __arm740_proc_info, . - __arm740_proc_info 170