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linux-loongson/arch/arm/mm/proc-sa1100.S
Russell King 9ca03a21e3 ARM: Factor out common code from cpu_proc_fin() 
All implementations of cpu_proc_fin() start by disabling interrupts
and then flush caches.  Rather than have every processors proc_fin()
implementation do this, move it out into generic code - and move the
cache flush past setup_mm_for_reboot() (so it can benefit from having
caches still enabled.)

This allows cpu_proc_fin() to become independent of the L1/L2 cache
types, and eventually move the L2 cache flushing into the L2 support
code.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-07-27 10:48:42 +01:00

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/*
* linux/arch/arm/mm/proc-sa1100.S
*
* Copyright (C) 1997-2002 Russell King
* hacked for non-paged-MM by Hyok S. Choi, 2003.
*
* 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.
*
* MMU functions for SA110
*
* These are the low level assembler for performing cache and TLB
* functions on the StrongARM-1100 and StrongARM-1110.
*
* Note that SA1100 and SA1110 share everything but their name and CPU ID.
*
* 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
* Flush the read buffer at context switches
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/hwcap.h>
#include <mach/hardware.h>
#include <asm/pgtable-hwdef.h>
#include <asm/pgtable.h>
#include "proc-macros.S"
/*
* the cache line size of the I and D cache
*/
#define DCACHELINESIZE 32
__INIT
/*
* cpu_sa1100_proc_init()
*/
ENTRY(cpu_sa1100_proc_init)
mov r0, #0
mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland
mov pc, lr
.section .text
/*
* cpu_sa1100_proc_fin()
*
* Prepare the CPU for reset:
* - Disable interrupts
* - Clean and turn off caches.
*/
ENTRY(cpu_sa1100_proc_fin)
mcr p15, 0, ip, c15, c2, 2 @ Disable clock switching
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
mov pc, lr
/*
* cpu_sa1100_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 5
ENTRY(cpu_sa1100_reset)
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........
mcr p15, 0, ip, c1, c0, 0 @ ctrl register
mov pc, r0
/*
* cpu_sa1100_do_idle(type)
*
* Cause the processor to idle
*
* type: call type:
* 0 = slow idle
* 1 = fast idle
* 2 = switch to slow processor clock
* 3 = switch to fast processor clock
*/
.align 5
ENTRY(cpu_sa1100_do_idle)
mov r0, r0 @ 4 nop padding
mov r0, r0
mov r0, r0
mov r0, r0 @ 4 nop padding
mov r0, r0
mov r0, r0
mov r0, #0
ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address
@ --- aligned to a cache line
mcr p15, 0, r0, c15, c2, 2 @ disable clock switching
ldr r1, [r1, #0] @ force switch to MCLK
mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt
mov r0, r0 @ safety
mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
mov pc, lr
/* ================================= CACHE ================================ */
/*
* cpu_sa1100_dcache_clean_area(addr,sz)
*
* Clean the specified entry of any caches such that the MMU
* translation fetches will obtain correct data.
*
* addr: cache-unaligned virtual address
*/
.align 5
ENTRY(cpu_sa1100_dcache_clean_area)
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
add r0, r0, #DCACHELINESIZE
subs r1, r1, #DCACHELINESIZE
bhi 1b
mov pc, lr
/* =============================== PageTable ============================== */
/*
* cpu_sa1100_switch_mm(pgd)
*
* Set the translation base pointer to be as described by pgd.
*
* pgd: new page tables
*/
.align 5
ENTRY(cpu_sa1100_switch_mm)
#ifdef CONFIG_MMU
str lr, [sp, #-4]!
bl v4wb_flush_kern_cache_all @ clears IP
mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
ldr pc, [sp], #4
#else
mov pc, lr
#endif
/*
* cpu_sa1100_set_pte_ext(ptep, pte, ext)
*
* Set a PTE and flush it out
*/
.align 5
ENTRY(cpu_sa1100_set_pte_ext)
#ifdef CONFIG_MMU
armv3_set_pte_ext wc_disable=0
mov r0, r0
mcr p15, 0, r0, c7, c10, 1 @ clean D entry
mcr p15, 0, r0, c7, c10, 4 @ drain WB
#endif
mov pc, lr
__INIT
.type __sa1100_setup, #function
__sa1100_setup:
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
adr r5, sa1100_crval
ldmia r5, {r5, r6}
mrc p15, 0, r0, c1, c0 @ get control register v4
bic r0, r0, r5
orr r0, r0, r6
mov pc, lr
.size __sa1100_setup, . - __sa1100_setup
/*
* R
* .RVI ZFRS BLDP WCAM
* ..11 0001 ..11 1101
*
*/
.type sa1100_crval, #object
sa1100_crval:
crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
__INITDATA
/*
* Purpose : Function pointers used to access above functions - all calls
* come through these
*/
/*
* SA1100 and SA1110 share the same function calls
*/
.type sa1100_processor_functions, #object
ENTRY(sa1100_processor_functions)
.word v4_early_abort
.word legacy_pabort
.word cpu_sa1100_proc_init
.word cpu_sa1100_proc_fin
.word cpu_sa1100_reset
.word cpu_sa1100_do_idle
.word cpu_sa1100_dcache_clean_area
.word cpu_sa1100_switch_mm
.word cpu_sa1100_set_pte_ext
.size sa1100_processor_functions, . - sa1100_processor_functions
.section ".rodata"
.type cpu_arch_name, #object
cpu_arch_name:
.asciz "armv4"
.size cpu_arch_name, . - cpu_arch_name
.type cpu_elf_name, #object
cpu_elf_name:
.asciz "v4"
.size cpu_elf_name, . - cpu_elf_name
.type cpu_sa1100_name, #object
cpu_sa1100_name:
.asciz "StrongARM-1100"
.size cpu_sa1100_name, . - cpu_sa1100_name
.type cpu_sa1110_name, #object
cpu_sa1110_name:
.asciz "StrongARM-1110"
.size cpu_sa1110_name, . - cpu_sa1110_name
.align
.section ".proc.info.init", #alloc, #execinstr
.type __sa1100_proc_info,#object
__sa1100_proc_info:
.long 0x4401a110
.long 0xfffffff0
.long PMD_TYPE_SECT | \
PMD_SECT_BUFFERABLE | \
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __sa1100_setup
.long cpu_arch_name
.long cpu_elf_name
.long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
.long cpu_sa1100_name
.long sa1100_processor_functions
.long v4wb_tlb_fns
.long v4_mc_user_fns
.long v4wb_cache_fns
.size __sa1100_proc_info, . - __sa1100_proc_info
.type __sa1110_proc_info,#object
__sa1110_proc_info:
.long 0x6901b110
.long 0xfffffff0
.long PMD_TYPE_SECT | \
PMD_SECT_BUFFERABLE | \
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __sa1100_setup
.long cpu_arch_name
.long cpu_elf_name
.long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
.long cpu_sa1110_name
.long sa1100_processor_functions
.long v4wb_tlb_fns
.long v4_mc_user_fns
.long v4wb_cache_fns
.size __sa1110_proc_info, . - __sa1110_proc_info
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