mirror of https://gitee.com/openkylin/linux.git
148 lines
3.7 KiB
ArmAsm
148 lines
3.7 KiB
ArmAsm
/* 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 <asm/assembler.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/hwcap.h>
|
|
#include <asm/pgtable-hwdef.h>
|
|
#include <asm/pgtable.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", #alloc
|
|
.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
|