mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
371 lines
9.3 KiB
ArmAsm
371 lines
9.3 KiB
ArmAsm
/*
|
|
* linux/arch/arm/mm/arm940.S: utility functions for ARM940T
|
|
*
|
|
* Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/hwcap.h>
|
|
#include <asm/pgtable-hwdef.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/ptrace.h>
|
|
#include "proc-macros.S"
|
|
|
|
/* ARM940T has a 4KB DCache comprising 256 lines of 4 words */
|
|
#define CACHE_DLINESIZE 16
|
|
#define CACHE_DSEGMENTS 4
|
|
#define CACHE_DENTRIES 64
|
|
|
|
.text
|
|
/*
|
|
* cpu_arm940_proc_init()
|
|
* cpu_arm940_switch_mm()
|
|
*
|
|
* These are not required.
|
|
*/
|
|
ENTRY(cpu_arm940_proc_init)
|
|
ENTRY(cpu_arm940_switch_mm)
|
|
mov pc, lr
|
|
|
|
/*
|
|
* cpu_arm940_proc_fin()
|
|
*/
|
|
ENTRY(cpu_arm940_proc_fin)
|
|
mrc p15, 0, r0, c1, c0, 0 @ ctrl register
|
|
bic r0, r0, #0x00001000 @ i-cache
|
|
bic r0, r0, #0x00000004 @ d-cache
|
|
mcr p15, 0, r0, c1, c0, 0 @ disable caches
|
|
mov pc, lr
|
|
|
|
/*
|
|
* cpu_arm940_reset(loc)
|
|
* Params : r0 = address to jump to
|
|
* Notes : This sets up everything for a reset
|
|
*/
|
|
ENTRY(cpu_arm940_reset)
|
|
mov ip, #0
|
|
mcr p15, 0, ip, c7, c5, 0 @ flush I cache
|
|
mcr p15, 0, ip, c7, c6, 0 @ flush D cache
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
|
mrc p15, 0, ip, c1, c0, 0 @ ctrl register
|
|
bic ip, ip, #0x00000005 @ .............c.p
|
|
bic ip, ip, #0x00001000 @ i-cache
|
|
mcr p15, 0, ip, c1, c0, 0 @ ctrl register
|
|
mov pc, r0
|
|
|
|
/*
|
|
* cpu_arm940_do_idle()
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_arm940_do_idle)
|
|
mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
|
|
mov pc, lr
|
|
|
|
/*
|
|
* flush_icache_all()
|
|
*
|
|
* Unconditionally clean and invalidate the entire icache.
|
|
*/
|
|
ENTRY(arm940_flush_icache_all)
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
mov pc, lr
|
|
ENDPROC(arm940_flush_icache_all)
|
|
|
|
/*
|
|
* flush_user_cache_all()
|
|
*/
|
|
ENTRY(arm940_flush_user_cache_all)
|
|
/* FALLTHROUGH */
|
|
|
|
/*
|
|
* flush_kern_cache_all()
|
|
*
|
|
* Clean and invalidate the entire cache.
|
|
*/
|
|
ENTRY(arm940_flush_kern_cache_all)
|
|
mov r2, #VM_EXEC
|
|
/* FALLTHROUGH */
|
|
|
|
/*
|
|
* flush_user_cache_range(start, end, flags)
|
|
*
|
|
* There is no efficient way to flush a range of cache entries
|
|
* in the specified address range. Thus, flushes all.
|
|
*
|
|
* - start - start address (inclusive)
|
|
* - end - end address (exclusive)
|
|
* - flags - vm_flags describing address space
|
|
*/
|
|
ENTRY(arm940_flush_user_cache_range)
|
|
mov ip, #0
|
|
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
mcr p15, 0, ip, c7, c6, 0 @ flush D cache
|
|
#else
|
|
mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
|
|
1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
|
|
2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
|
|
subs r3, r3, #1 << 26
|
|
bcs 2b @ entries 63 to 0
|
|
subs r1, r1, #1 << 4
|
|
bcs 1b @ segments 3 to 0
|
|
#endif
|
|
tst r2, #VM_EXEC
|
|
mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
mcrne p15, 0, ip, c7, c10, 4 @ drain WB
|
|
mov pc, lr
|
|
|
|
/*
|
|
* coherent_kern_range(start, end)
|
|
*
|
|
* Ensure coherency between the Icache and the Dcache in the
|
|
* region described by start, end. If you have non-snooping
|
|
* Harvard caches, you need to implement this function.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
ENTRY(arm940_coherent_kern_range)
|
|
/* FALLTHROUGH */
|
|
|
|
/*
|
|
* coherent_user_range(start, end)
|
|
*
|
|
* Ensure coherency between the Icache and the Dcache in the
|
|
* region described by start, end. If you have non-snooping
|
|
* Harvard caches, you need to implement this function.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
ENTRY(arm940_coherent_user_range)
|
|
/* FALLTHROUGH */
|
|
|
|
/*
|
|
* flush_kern_dcache_area(void *addr, size_t size)
|
|
*
|
|
* Ensure no D cache aliasing occurs, either with itself or
|
|
* the I cache
|
|
*
|
|
* - addr - kernel address
|
|
* - size - region size
|
|
*/
|
|
ENTRY(arm940_flush_kern_dcache_area)
|
|
mov ip, #0
|
|
mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
|
|
1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
|
|
2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
|
|
subs r3, r3, #1 << 26
|
|
bcs 2b @ entries 63 to 0
|
|
subs r1, r1, #1 << 4
|
|
bcs 1b @ segments 7 to 0
|
|
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
|
mov pc, lr
|
|
|
|
/*
|
|
* dma_inv_range(start, end)
|
|
*
|
|
* There is no efficient way to invalidate a specifid virtual
|
|
* address range. Thus, invalidates all.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
arm940_dma_inv_range:
|
|
mov ip, #0
|
|
mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
|
|
1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
|
|
2: mcr p15, 0, r3, c7, c6, 2 @ flush D entry
|
|
subs r3, r3, #1 << 26
|
|
bcs 2b @ entries 63 to 0
|
|
subs r1, r1, #1 << 4
|
|
bcs 1b @ segments 7 to 0
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
|
mov pc, lr
|
|
|
|
/*
|
|
* dma_clean_range(start, end)
|
|
*
|
|
* There is no efficient way to clean a specifid virtual
|
|
* address range. Thus, cleans all.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
arm940_dma_clean_range:
|
|
ENTRY(cpu_arm940_dcache_clean_area)
|
|
mov ip, #0
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
|
|
1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
|
|
2: mcr p15, 0, r3, c7, c10, 2 @ clean D entry
|
|
subs r3, r3, #1 << 26
|
|
bcs 2b @ entries 63 to 0
|
|
subs r1, r1, #1 << 4
|
|
bcs 1b @ segments 7 to 0
|
|
#endif
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
|
mov pc, lr
|
|
|
|
/*
|
|
* dma_flush_range(start, end)
|
|
*
|
|
* There is no efficient way to clean and invalidate a specifid
|
|
* virtual address range.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*/
|
|
ENTRY(arm940_dma_flush_range)
|
|
mov ip, #0
|
|
mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
|
|
1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
|
|
2:
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
mcr p15, 0, r3, c7, c14, 2 @ clean/flush D entry
|
|
#else
|
|
mcr p15, 0, r3, c7, c6, 2 @ invalidate D entry
|
|
#endif
|
|
subs r3, r3, #1 << 26
|
|
bcs 2b @ entries 63 to 0
|
|
subs r1, r1, #1 << 4
|
|
bcs 1b @ segments 7 to 0
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
|
mov pc, lr
|
|
|
|
/*
|
|
* dma_map_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
ENTRY(arm940_dma_map_area)
|
|
add r1, r1, r0
|
|
cmp r2, #DMA_TO_DEVICE
|
|
beq arm940_dma_clean_range
|
|
bcs arm940_dma_inv_range
|
|
b arm940_dma_flush_range
|
|
ENDPROC(arm940_dma_map_area)
|
|
|
|
/*
|
|
* dma_unmap_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
ENTRY(arm940_dma_unmap_area)
|
|
mov pc, lr
|
|
ENDPROC(arm940_dma_unmap_area)
|
|
|
|
@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
|
|
define_cache_functions arm940
|
|
|
|
__CPUINIT
|
|
|
|
.type __arm940_setup, #function
|
|
__arm940_setup:
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
|
|
mcr p15, 0, r0, c6, c3, 0 @ disable data area 3~7
|
|
mcr p15, 0, r0, c6, c4, 0
|
|
mcr p15, 0, r0, c6, c5, 0
|
|
mcr p15, 0, r0, c6, c6, 0
|
|
mcr p15, 0, r0, c6, c7, 0
|
|
|
|
mcr p15, 0, r0, c6, c3, 1 @ disable instruction area 3~7
|
|
mcr p15, 0, r0, c6, c4, 1
|
|
mcr p15, 0, r0, c6, c5, 1
|
|
mcr p15, 0, r0, c6, c6, 1
|
|
mcr p15, 0, r0, c6, c7, 1
|
|
|
|
mov r0, #0x0000003F @ base = 0, size = 4GB
|
|
mcr p15, 0, r0, c6, c0, 0 @ set area 0, default
|
|
mcr p15, 0, r0, c6, c0, 1
|
|
|
|
ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
|
|
ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
|
|
mov r2, #10 @ 11 is the minimum (4KB)
|
|
1: add r2, r2, #1 @ area size *= 2
|
|
mov r1, r1, lsr #1
|
|
bne 1b @ count not zero r-shift
|
|
orr r0, r0, r2, lsl #1 @ the area register value
|
|
orr r0, r0, #1 @ set enable bit
|
|
mcr p15, 0, r0, c6, c1, 0 @ set area 1, RAM
|
|
mcr p15, 0, r0, c6, c1, 1
|
|
|
|
ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
|
|
ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
|
|
mov r2, #10 @ 11 is the minimum (4KB)
|
|
1: add r2, r2, #1 @ area size *= 2
|
|
mov r1, r1, lsr #1
|
|
bne 1b @ count not zero r-shift
|
|
orr r0, r0, r2, lsl #1 @ the area register value
|
|
orr r0, r0, #1 @ set enable bit
|
|
mcr p15, 0, r0, c6, c2, 0 @ set area 2, ROM/FLASH
|
|
mcr p15, 0, r0, c6, c2, 1
|
|
|
|
mov r0, #0x06
|
|
mcr p15, 0, r0, c2, c0, 0 @ Region 1&2 cacheable
|
|
mcr p15, 0, r0, c2, c0, 1
|
|
#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, 0
|
|
|
|
mov r0, #0x10000
|
|
sub r0, r0, #1 @ r0 = 0xffff
|
|
mcr p15, 0, r0, c5, c0, 0 @ all read/write access
|
|
mcr p15, 0, r0, c5, c0, 1
|
|
|
|
mrc p15, 0, r0, c1, c0 @ get control register
|
|
orr r0, r0, #0x00001000 @ I-cache
|
|
orr r0, r0, #0x00000005 @ MPU/D-cache
|
|
|
|
mov pc, lr
|
|
|
|
.size __arm940_setup, . - __arm940_setup
|
|
|
|
__INITDATA
|
|
|
|
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
|
|
define_processor_functions arm940, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1
|
|
|
|
.section ".rodata"
|
|
|
|
string cpu_arch_name, "armv4t"
|
|
string cpu_elf_name, "v4"
|
|
string cpu_arm940_name, "ARM940T"
|
|
|
|
.align
|
|
|
|
.section ".proc.info.init", #alloc, #execinstr
|
|
|
|
.type __arm940_proc_info,#object
|
|
__arm940_proc_info:
|
|
.long 0x41009400
|
|
.long 0xff00fff0
|
|
.long 0
|
|
b __arm940_setup
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
|
|
.long cpu_arm940_name
|
|
.long arm940_processor_functions
|
|
.long 0
|
|
.long 0
|
|
.long arm940_cache_fns
|
|
.size __arm940_proc_info, . - __arm940_proc_info
|
|
|