214 lines
4.9 KiB
ArmAsm
214 lines
4.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* linux/arch/arm/mm/proc-fa526.S: MMU functions for FA526
|
|
*
|
|
* Written by : Luke Lee
|
|
* Copyright (C) 2005 Faraday Corp.
|
|
* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
|
|
*
|
|
* These are the low level assembler for performing cache and TLB
|
|
* functions on the fa526.
|
|
*/
|
|
#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/page.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
#include "proc-macros.S"
|
|
|
|
#define CACHE_DLINESIZE 16
|
|
|
|
.text
|
|
/*
|
|
* cpu_fa526_proc_init()
|
|
*/
|
|
ENTRY(cpu_fa526_proc_init)
|
|
ret lr
|
|
|
|
/*
|
|
* cpu_fa526_proc_fin()
|
|
*/
|
|
ENTRY(cpu_fa526_proc_fin)
|
|
mrc p15, 0, r0, c1, c0, 0 @ ctrl register
|
|
bic r0, r0, #0x1000 @ ...i............
|
|
bic r0, r0, #0x000e @ ............wca.
|
|
mcr p15, 0, r0, c1, c0, 0 @ disable caches
|
|
nop
|
|
nop
|
|
ret lr
|
|
|
|
/*
|
|
* cpu_fa526_reset(loc)
|
|
*
|
|
* Perform a soft reset of the system. Put the CPU into the
|
|
* same state as it would be if it had been reset, and branch
|
|
* to what would be the reset vector.
|
|
*
|
|
* loc: location to jump to for soft reset
|
|
*/
|
|
.align 4
|
|
.pushsection .idmap.text, "ax"
|
|
ENTRY(cpu_fa526_reset)
|
|
/* TODO: Use CP8 if possible... */
|
|
mov ip, #0
|
|
mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
|
#ifdef CONFIG_MMU
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
|
|
#endif
|
|
mrc p15, 0, ip, c1, c0, 0 @ ctrl register
|
|
bic ip, ip, #0x000f @ ............wcam
|
|
bic ip, ip, #0x1100 @ ...i...s........
|
|
bic ip, ip, #0x0800 @ BTB off
|
|
mcr p15, 0, ip, c1, c0, 0 @ ctrl register
|
|
nop
|
|
nop
|
|
ret r0
|
|
ENDPROC(cpu_fa526_reset)
|
|
.popsection
|
|
|
|
/*
|
|
* cpu_fa526_do_idle()
|
|
*/
|
|
.align 4
|
|
ENTRY(cpu_fa526_do_idle)
|
|
ret lr
|
|
|
|
|
|
ENTRY(cpu_fa526_dcache_clean_area)
|
|
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
add r0, r0, #CACHE_DLINESIZE
|
|
subs r1, r1, #CACHE_DLINESIZE
|
|
bhi 1b
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
ret lr
|
|
|
|
/* =============================== PageTable ============================== */
|
|
|
|
/*
|
|
* cpu_fa526_switch_mm(pgd)
|
|
*
|
|
* Set the translation base pointer to be as described by pgd.
|
|
*
|
|
* pgd: new page tables
|
|
*/
|
|
.align 4
|
|
ENTRY(cpu_fa526_switch_mm)
|
|
#ifdef CONFIG_MMU
|
|
mov ip, #0
|
|
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
|
|
mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
|
|
#else
|
|
mcr p15, 0, ip, c7, c14, 0 @ clean and invalidate whole D cache
|
|
#endif
|
|
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, ip, c7, c5, 6 @ invalidate BTB since mm changed
|
|
mcr p15, 0, ip, c7, c10, 4 @ data write barrier
|
|
mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
|
|
mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate UTLB
|
|
#endif
|
|
ret lr
|
|
|
|
/*
|
|
* cpu_fa526_set_pte_ext(ptep, pte, ext)
|
|
*
|
|
* Set a PTE and flush it out
|
|
*/
|
|
.align 4
|
|
ENTRY(cpu_fa526_set_pte_ext)
|
|
#ifdef CONFIG_MMU
|
|
armv3_set_pte_ext
|
|
mov r0, r0
|
|
mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
#endif
|
|
ret lr
|
|
|
|
.type __fa526_setup, #function
|
|
__fa526_setup:
|
|
/* On return of this routine, r0 must carry correct flags for CFG register */
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
|
|
#ifdef CONFIG_MMU
|
|
mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
|
|
#endif
|
|
mcr p15, 0, r0, c7, c5, 5 @ invalidate IScratchpad RAM
|
|
|
|
mov r0, #1
|
|
mcr p15, 0, r0, c1, c1, 0 @ turn-on ECR
|
|
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB All
|
|
mcr p15, 0, r0, c7, c10, 4 @ data write barrier
|
|
mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
|
|
|
|
mov r0, #0x1f @ Domains 0, 1 = manager, 2 = client
|
|
mcr p15, 0, r0, c3, c0 @ load domain access register
|
|
|
|
mrc p15, 0, r0, c1, c0 @ get control register v4
|
|
ldr r5, fa526_cr1_clear
|
|
bic r0, r0, r5
|
|
ldr r5, fa526_cr1_set
|
|
orr r0, r0, r5
|
|
ret lr
|
|
.size __fa526_setup, . - __fa526_setup
|
|
|
|
/*
|
|
* .RVI ZFRS BLDP WCAM
|
|
* ..11 1001 .111 1101
|
|
*
|
|
*/
|
|
.type fa526_cr1_clear, #object
|
|
.type fa526_cr1_set, #object
|
|
fa526_cr1_clear:
|
|
.word 0x3f3f
|
|
fa526_cr1_set:
|
|
.word 0x397D
|
|
|
|
__INITDATA
|
|
|
|
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
|
|
define_processor_functions fa526, dabort=v4_early_abort, pabort=legacy_pabort
|
|
|
|
.section ".rodata"
|
|
|
|
string cpu_arch_name, "armv4"
|
|
string cpu_elf_name, "v4"
|
|
string cpu_fa526_name, "FA526"
|
|
|
|
.align
|
|
|
|
.section ".proc.info.init", #alloc
|
|
|
|
.type __fa526_proc_info,#object
|
|
__fa526_proc_info:
|
|
.long 0x66015261
|
|
.long 0xff01fff1
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_BUFFERABLE | \
|
|
PMD_SECT_CACHEABLE | \
|
|
PMD_BIT4 | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_BIT4 | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
initfn __fa526_setup, __fa526_proc_info
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP | HWCAP_HALF
|
|
.long cpu_fa526_name
|
|
.long fa526_processor_functions
|
|
.long fa_tlb_fns
|
|
.long fa_user_fns
|
|
.long fa_cache_fns
|
|
.size __fa526_proc_info, . - __fa526_proc_info
|