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#include "proc-macros.S" 21 22 .text 23/* 24 * cpu_arm740_proc_init() 25 * cpu_arm740_do_idle() 26 * cpu_arm740_dcache_clean_area() 27 * cpu_arm740_switch_mm() 28 * 29 * These are not required. 30 */ 31ENTRY(cpu_arm740_proc_init) 32ENTRY(cpu_arm740_do_idle) 33ENTRY(cpu_arm740_dcache_clean_area) 34ENTRY(cpu_arm740_switch_mm) 35 ret lr 36 37/* 38 * cpu_arm740_proc_fin() 39 */ 40ENTRY(cpu_arm740_proc_fin) 41 mrc p15, 0, r0, c1, c0, 0 42 bic r0, r0, #0x3f000000 @ bank/f/lock/s 43 bic r0, r0, #0x0000000c @ w-buffer/cache 44 mcr p15, 0, r0, c1, c0, 0 @ disable caches 45 ret lr 46 47/* 48 * cpu_arm740_reset(loc) 49 * Params : r0 = address to jump to 50 * Notes : This sets up everything for a reset 51 */ 52 .pushsection .idmap.text, "ax" 53ENTRY(cpu_arm740_reset) 54 mov ip, #0 55 mcr p15, 0, ip, c7, c0, 0 @ invalidate cache 56 mrc p15, 0, ip, c1, c0, 0 @ get ctrl register 57 bic ip, ip, #0x0000000c @ ............wc.. 58 mcr p15, 0, ip, c1, c0, 0 @ ctrl register 59 ret r0 60ENDPROC(cpu_arm740_reset) 61 .popsection 62 63 .type __arm740_setup, #function 64__arm740_setup: 65 mov r0, #0 66 mcr p15, 0, r0, c7, c0, 0 @ invalidate caches 67 68 mcr p15, 0, r0, c6, c3 @ disable area 3~7 69 mcr p15, 0, r0, c6, c4 70 mcr p15, 0, r0, c6, c5 71 mcr p15, 0, r0, c6, c6 72 mcr p15, 0, r0, c6, c7 73 74 mov r0, #0x0000003F @ base = 0, size = 4GB 75 mcr p15, 0, r0, c6, c0 @ set area 0, default 76 77 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM 78 ldr r3, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB) 79 mov r4, #10 @ 11 is the minimum (4KB) 801: add r4, r4, #1 @ area size *= 2 81 movs r3, r3, lsr #1 82 bne 1b @ count not zero r-shift 83 orr r0, r0, r4, lsl #1 @ the area register value 84 orr r0, r0, #1 @ set enable bit 85 mcr p15, 0, r0, c6, c1 @ set area 1, RAM 86 87 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH 88 ldr r3, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB) 89 cmp r3, #0 90 moveq r0, #0 91 beq 2f 92 mov r4, #10 @ 11 is the minimum (4KB) 931: add r4, r4, #1 @ area size *= 2 94 movs r3, r3, lsr #1 95 bne 1b @ count not zero r-shift 96 orr r0, r0, r4, lsl #1 @ the area register value 97 orr r0, r0, #1 @ set enable bit 982: mcr p15, 0, r0, c6, c2 @ set area 2, ROM/FLASH 99 100 mov r0, #0x06 101 mcr p15, 0, r0, c2, c0 @ Region 1&2 cacheable 102#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 103 mov r0, #0x00 @ disable whole write buffer 104#else 105 mov r0, #0x02 @ Region 1 write bufferred 106#endif 107 mcr p15, 0, r0, c3, c0 108 109 mov r0, #0x10000 110 sub r0, r0, #1 @ r0 = 0xffff 111 mcr p15, 0, r0, c5, c0 @ all read/write access 112 113 mrc p15, 0, r0, c1, c0 @ get control register 114 bic r0, r0, #0x3F000000 @ set to standard caching mode 115 @ need some benchmark 116 orr r0, r0, #0x0000000d @ MPU/Cache/WB 117 118 ret lr 119 120 .size __arm740_setup, . - __arm740_setup 121 122 __INITDATA 123 124 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) 125 define_processor_functions arm740, dabort=v4t_late_abort, pabort=legacy_pabort, nommu=1 126 127 .section ".rodata" 128 129 string cpu_arch_name, "armv4" 130 string cpu_elf_name, "v4" 131 string cpu_arm740_name, "ARM740T" 132 133 .align 134 135 .section ".proc.info.init", #alloc, #execinstr 136 .type __arm740_proc_info,#object 137__arm740_proc_info: 138 .long 0x41807400 139 .long 0xfffffff0 140 .long 0 141 .long 0 142 b __arm740_setup 143 .long cpu_arch_name 144 .long cpu_elf_name 145 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_26BIT 146 .long cpu_arm740_name 147 .long arm740_processor_functions 148 .long 0 149 .long 0 150 .long v4_cache_fns @ cache model 151 .size __arm740_proc_info, . - __arm740_proc_info 152