420 lines
10 KiB
ArmAsm
420 lines
10 KiB
ArmAsm
/*
|
|
* linux/arch/arm/mm/arm946.S: utility functions for ARM946E-S
|
|
*
|
|
* Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
|
|
*
|
|
* (Many of cache codes are from proc-arm926.S)
|
|
*
|
|
* 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"
|
|
|
|
/*
|
|
* ARM946E-S is synthesizable to have 0KB to 1MB sized D-Cache,
|
|
* comprising 256 lines of 32 bytes (8 words).
|
|
*/
|
|
#define CACHE_DSIZE (CONFIG_CPU_DCACHE_SIZE) /* typically 8KB. */
|
|
#define CACHE_DLINESIZE 32 /* fixed */
|
|
#define CACHE_DSEGMENTS 4 /* fixed */
|
|
#define CACHE_DENTRIES (CACHE_DSIZE / CACHE_DSEGMENTS / CACHE_DLINESIZE)
|
|
#define CACHE_DLIMIT (CACHE_DSIZE * 4) /* benchmark needed */
|
|
|
|
.text
|
|
/*
|
|
* cpu_arm946_proc_init()
|
|
* cpu_arm946_switch_mm()
|
|
*
|
|
* These are not required.
|
|
*/
|
|
ENTRY(cpu_arm946_proc_init)
|
|
ENTRY(cpu_arm946_switch_mm)
|
|
ret lr
|
|
|
|
/*
|
|
* cpu_arm946_proc_fin()
|
|
*/
|
|
ENTRY(cpu_arm946_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
|
|
ret lr
|
|
|
|
/*
|
|
* cpu_arm946_reset(loc)
|
|
* Params : r0 = address to jump to
|
|
* Notes : This sets up everything for a reset
|
|
*/
|
|
.pushsection .idmap.text, "ax"
|
|
ENTRY(cpu_arm946_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
|
|
ret r0
|
|
ENDPROC(cpu_arm946_reset)
|
|
.popsection
|
|
|
|
/*
|
|
* cpu_arm946_do_idle()
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_arm946_do_idle)
|
|
mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
|
|
ret lr
|
|
|
|
/*
|
|
* flush_icache_all()
|
|
*
|
|
* Unconditionally clean and invalidate the entire icache.
|
|
*/
|
|
ENTRY(arm946_flush_icache_all)
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
ret lr
|
|
ENDPROC(arm946_flush_icache_all)
|
|
|
|
/*
|
|
* flush_user_cache_all()
|
|
*/
|
|
ENTRY(arm946_flush_user_cache_all)
|
|
/* FALLTHROUGH */
|
|
|
|
/*
|
|
* flush_kern_cache_all()
|
|
*
|
|
* Clean and invalidate the entire cache.
|
|
*/
|
|
ENTRY(arm946_flush_kern_cache_all)
|
|
mov r2, #VM_EXEC
|
|
mov ip, #0
|
|
__flush_whole_cache:
|
|
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
mcr p15, 0, ip, c7, c6, 0 @ flush D cache
|
|
#else
|
|
mov r1, #(CACHE_DSEGMENTS - 1) << 29 @ 4 segments
|
|
1: orr r3, r1, #(CACHE_DENTRIES - 1) << 4 @ n entries
|
|
2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
|
|
subs r3, r3, #1 << 4
|
|
bcs 2b @ entries n to 0
|
|
subs r1, r1, #1 << 29
|
|
bcs 1b @ segments 3 to 0
|
|
#endif
|
|
tst r2, #VM_EXEC
|
|
mcrne p15, 0, ip, c7, c5, 0 @ flush I cache
|
|
mcrne p15, 0, ip, c7, c10, 4 @ drain WB
|
|
ret lr
|
|
|
|
/*
|
|
* flush_user_cache_range(start, end, flags)
|
|
*
|
|
* Clean and invalidate a range of cache entries in the
|
|
* specified address range.
|
|
*
|
|
* - start - start address (inclusive)
|
|
* - end - end address (exclusive)
|
|
* - flags - vm_flags describing address space
|
|
* (same as arm926)
|
|
*/
|
|
ENTRY(arm946_flush_user_cache_range)
|
|
mov ip, #0
|
|
sub r3, r1, r0 @ calculate total size
|
|
cmp r3, #CACHE_DLIMIT
|
|
bhs __flush_whole_cache
|
|
|
|
1: tst r2, #VM_EXEC
|
|
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
|
mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
|
mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
#else
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
|
|
mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
|
|
mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
#endif
|
|
cmp r0, r1
|
|
blo 1b
|
|
tst r2, #VM_EXEC
|
|
mcrne p15, 0, ip, c7, c10, 4 @ drain WB
|
|
ret 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(arm946_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
|
|
* (same as arm926)
|
|
*/
|
|
ENTRY(arm946_coherent_user_range)
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
mov r0, #0
|
|
ret lr
|
|
|
|
/*
|
|
* 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
|
|
* (same as arm926)
|
|
*/
|
|
ENTRY(arm946_flush_kern_dcache_area)
|
|
add r1, r0, r1
|
|
1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
ret lr
|
|
|
|
/*
|
|
* dma_inv_range(start, end)
|
|
*
|
|
* Invalidate (discard) the specified virtual address range.
|
|
* May not write back any entries. If 'start' or 'end'
|
|
* are not cache line aligned, those lines must be written
|
|
* back.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
* (same as arm926)
|
|
*/
|
|
arm946_dma_inv_range:
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
tst r0, #CACHE_DLINESIZE - 1
|
|
mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
tst r1, #CACHE_DLINESIZE - 1
|
|
mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
|
|
#endif
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
|
1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
ret lr
|
|
|
|
/*
|
|
* dma_clean_range(start, end)
|
|
*
|
|
* Clean the specified virtual address range.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*
|
|
* (same as arm926)
|
|
*/
|
|
arm946_dma_clean_range:
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
#endif
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
ret lr
|
|
|
|
/*
|
|
* dma_flush_range(start, end)
|
|
*
|
|
* Clean and invalidate the specified virtual address range.
|
|
*
|
|
* - start - virtual start address
|
|
* - end - virtual end address
|
|
*
|
|
* (same as arm926)
|
|
*/
|
|
ENTRY(arm946_dma_flush_range)
|
|
bic r0, r0, #CACHE_DLINESIZE - 1
|
|
1:
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
|
|
#else
|
|
mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
|
|
#endif
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
cmp r0, r1
|
|
blo 1b
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
ret lr
|
|
|
|
/*
|
|
* dma_map_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
ENTRY(arm946_dma_map_area)
|
|
add r1, r1, r0
|
|
cmp r2, #DMA_TO_DEVICE
|
|
beq arm946_dma_clean_range
|
|
bcs arm946_dma_inv_range
|
|
b arm946_dma_flush_range
|
|
ENDPROC(arm946_dma_map_area)
|
|
|
|
/*
|
|
* dma_unmap_area(start, size, dir)
|
|
* - start - kernel virtual start address
|
|
* - size - size of region
|
|
* - dir - DMA direction
|
|
*/
|
|
ENTRY(arm946_dma_unmap_area)
|
|
ret lr
|
|
ENDPROC(arm946_dma_unmap_area)
|
|
|
|
.globl arm946_flush_kern_cache_louis
|
|
.equ arm946_flush_kern_cache_louis, arm946_flush_kern_cache_all
|
|
|
|
@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
|
|
define_cache_functions arm946
|
|
|
|
ENTRY(cpu_arm946_dcache_clean_area)
|
|
#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
subs r1, r1, #CACHE_DLINESIZE
|
|
bhi 1b
|
|
#endif
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
ret lr
|
|
|
|
.type __arm946_setup, #function
|
|
__arm946_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 memory region 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
|
|
|
|
mov r0, #0x0000003F @ base = 0, size = 4GB
|
|
mcr p15, 0, r0, c6, c0, 0 @ set region 0, default
|
|
|
|
ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
|
|
ldr r7, =CONFIG_DRAM_SIZE @ size of RAM (must be >= 4KB)
|
|
pr_val r3, r0, r7, #1
|
|
mcr p15, 0, r3, c6, c1, 0
|
|
|
|
ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
|
|
ldr r7, =CONFIG_FLASH_SIZE @ size of FLASH (must be >= 4KB)
|
|
pr_val r3, r0, r7, #1
|
|
mcr p15, 0, r3, c6, c2, 0
|
|
|
|
mov r0, #0x06
|
|
mcr p15, 0, r0, c2, c0, 0 @ region 1,2 d-cacheable
|
|
mcr p15, 0, r0, c2, c0, 1 @ region 1,2 i-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, 0
|
|
|
|
/*
|
|
* Access Permission Settings for future permission control by PU.
|
|
*
|
|
* priv. user
|
|
* region 0 (whole) rw -- : b0001
|
|
* region 1 (RAM) rw rw : b0011
|
|
* region 2 (FLASH) rw r- : b0010
|
|
* region 3~7 (none) -- -- : b0000
|
|
*/
|
|
mov r0, #0x00000031
|
|
orr r0, r0, #0x00000200
|
|
mcr p15, 0, r0, c5, c0, 2 @ set data access permission
|
|
mcr p15, 0, r0, c5, c0, 3 @ set inst. access permission
|
|
|
|
mrc p15, 0, r0, c1, c0 @ get control register
|
|
orr r0, r0, #0x00001000 @ I-cache
|
|
orr r0, r0, #0x00000005 @ MPU/D-cache
|
|
#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
|
|
orr r0, r0, #0x00004000 @ .1.. .... .... ....
|
|
#endif
|
|
ret lr
|
|
|
|
.size __arm946_setup, . - __arm946_setup
|
|
|
|
__INITDATA
|
|
|
|
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
|
|
define_processor_functions arm946, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1
|
|
|
|
.section ".rodata"
|
|
|
|
string cpu_arch_name, "armv5te"
|
|
string cpu_elf_name, "v5t"
|
|
string cpu_arm946_name, "ARM946E-S"
|
|
|
|
.align
|
|
|
|
.section ".proc.info.init", #alloc
|
|
.type __arm946_proc_info,#object
|
|
__arm946_proc_info:
|
|
.long 0x41009460
|
|
.long 0xff00fff0
|
|
.long 0
|
|
.long 0
|
|
initfn __arm946_setup, __arm946_proc_info
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
|
|
.long cpu_arm946_name
|
|
.long arm946_processor_functions
|
|
.long 0
|
|
.long 0
|
|
.long arm946_cache_fns
|
|
.size __arm946_proc_info, . - __arm946_proc_info
|
|
|