Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | /* SPDX-License-Identifier: GPL-2.0-only */ /* * linux/arch/arm/mm/arm740.S: utility functions for ARM740 * * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com) */ #include <linux/linkage.h> #include <linux/init.h> #include <linux/pgtable.h> #include <asm/assembler.h> #include <asm/asm-offsets.h> #include <asm/hwcap.h> #include <asm/pgtable-hwdef.h> #include <asm/ptrace.h> #include "proc-macros.S" .text /* * cpu_arm740_proc_init() * cpu_arm740_do_idle() * cpu_arm740_dcache_clean_area() * cpu_arm740_switch_mm() * * These are not required. */ ENTRY(cpu_arm740_proc_init) ENTRY(cpu_arm740_do_idle) ENTRY(cpu_arm740_dcache_clean_area) ENTRY(cpu_arm740_switch_mm) ret lr /* * cpu_arm740_proc_fin() */ ENTRY(cpu_arm740_proc_fin) mrc p15, 0, r0, c1, c0, 0 bic r0, r0, #0x3f000000 @ bank/f/lock/s bic r0, r0, #0x0000000c @ w-buffer/cache mcr p15, 0, r0, c1, c0, 0 @ disable caches ret lr /* * cpu_arm740_reset(loc) * Params : r0 = address to jump to * Notes : This sets up everything for a reset */ .pushsection .idmap.text, "ax" ENTRY(cpu_arm740_reset) mov ip, #0 mcr p15, 0, ip, c7, c0, 0 @ invalidate cache mrc p15, 0, ip, c1, c0, 0 @ get ctrl register bic ip, ip, #0x0000000c @ ............wc.. mcr p15, 0, ip, c1, c0, 0 @ ctrl register ret r0 ENDPROC(cpu_arm740_reset) .popsection .type __arm740_setup, #function __arm740_setup: mov r0, #0 mcr p15, 0, r0, c7, c0, 0 @ invalidate caches mcr p15, 0, r0, c6, c3 @ disable area 3~7 mcr p15, 0, r0, c6, c4 mcr p15, 0, r0, c6, c5 mcr p15, 0, r0, c6, c6 mcr p15, 0, r0, c6, c7 mov r0, #0x0000003F @ base = 0, size = 4GB mcr p15, 0, r0, c6, c0 @ set area 0, default ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM ldr r3, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB) mov r4, #10 @ 11 is the minimum (4KB) 1: add r4, r4, #1 @ area size *= 2 movs r3, r3, lsr #1 bne 1b @ count not zero r-shift orr r0, r0, r4, lsl #1 @ the area register value orr r0, r0, #1 @ set enable bit mcr p15, 0, r0, c6, c1 @ set area 1, RAM ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH ldr r3, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB) cmp r3, #0 moveq r0, #0 beq 2f mov r4, #10 @ 11 is the minimum (4KB) 1: add r4, r4, #1 @ area size *= 2 movs r3, r3, lsr #1 bne 1b @ count not zero r-shift orr r0, r0, r4, lsl #1 @ the area register value orr r0, r0, #1 @ set enable bit 2: mcr p15, 0, r0, c6, c2 @ set area 2, ROM/FLASH mov r0, #0x06 mcr p15, 0, r0, c2, c0 @ Region 1&2 cacheable #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH mov r0, #0x00 @ disable whole write buffer #else mov r0, #0x02 @ Region 1 write bufferred #endif mcr p15, 0, r0, c3, c0 mov r0, #0x10000 sub r0, r0, #1 @ r0 = 0xffff mcr p15, 0, r0, c5, c0 @ all read/write access mrc p15, 0, r0, c1, c0 @ get control register bic r0, r0, #0x3F000000 @ set to standard caching mode @ need some benchmark orr r0, r0, #0x0000000d @ MPU/Cache/WB ret lr .size __arm740_setup, . - __arm740_setup __INITDATA @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) define_processor_functions arm740, dabort=v4t_late_abort, pabort=legacy_pabort, nommu=1 .section ".rodata" string cpu_arch_name, "armv4" string cpu_elf_name, "v4" string cpu_arm740_name, "ARM740T" .align .section ".proc.info.init", "a" .type __arm740_proc_info,#object __arm740_proc_info: .long 0x41807400 .long 0xfffffff0 .long 0 .long 0 initfn __arm740_setup, __arm740_proc_info .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_26BIT .long cpu_arm740_name .long arm740_processor_functions .long 0 .long 0 .long v4_cache_fns @ cache model .size __arm740_proc_info, . - __arm740_proc_info |