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linux/arch/arm/mm/proc-sa1100.S
Russell King 6f354e5f40 ARM: pm: CPU specific code should not overwrite r1 (v:p offset) 
r1 stores the v:p offset from the CPU invariant resume code, and is
expected to be preserved by the CPU specific code.  Overwriting it is
not a good idea.

We've managed to get away with it on sa1100 platforms because most
happen to have PHYS_OFFSET == PAGE_OFFSET, but that may not be the
case depending on kernel configuration.  So fix this latent bug.

This fixes xsc3 as well which was saving and restoring this register
independently.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-08-28 10:39:53 +01:00

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7.0 KiB
ArmAsm
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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
.section .text
/*
* 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
/*
* 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
.globl cpu_sa1100_suspend_size
.equ cpu_sa1100_suspend_size, 4*4
#ifdef CONFIG_PM_SLEEP
ENTRY(cpu_sa1100_do_suspend)
stmfd sp!, {r4 - r7, lr}
mrc p15, 0, r4, c3, c0, 0 @ domain ID
mrc p15, 0, r5, c2, c0, 0 @ translation table base addr
mrc p15, 0, r6, c13, c0, 0 @ PID
mrc p15, 0, r7, c1, c0, 0 @ control reg
stmia r0, {r4 - r7} @ store cp regs
ldmfd sp!, {r4 - r7, pc}
ENDPROC(cpu_sa1100_do_suspend)
ENTRY(cpu_sa1100_do_resume)
ldmia r0, {r4 - r7} @ load cp regs
mov ip, #0
mcr p15, 0, ip, c8, c7, 0 @ flush I+D TLBs
mcr p15, 0, ip, c7, c7, 0 @ flush I&D cache
mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
mcr p15, 0, ip, c9, c0, 5 @ allow user space to use RB
mcr p15, 0, r4, c3, c0, 0 @ domain ID
mcr p15, 0, r5, c2, c0, 0 @ translation table base addr
mcr p15, 0, r6, c13, c0, 0 @ PID
mov r0, r7 @ control register
mov r2, r5, lsr #14 @ get TTB0 base
mov r2, r2, lsl #14
ldr r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
PMD_SECT_CACHEABLE | PMD_SECT_AP_WRITE
b cpu_resume_mmu
ENDPROC(cpu_sa1100_do_resume)
#endif
__CPUINIT
.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
/*
* SA1100 and SA1110 share the same function calls
*/
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
define_processor_functions sa1100, dabort=v4_early_abort, pabort=legacy_pabort, suspend=1
.section ".rodata"
string cpu_arch_name, "armv4"
string cpu_elf_name, "v4"
string cpu_sa1100_name, "StrongARM-1100"
string cpu_sa1110_name, "StrongARM-1110"
.align
.section ".proc.info.init", #alloc, #execinstr
.macro sa1100_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req
.type __\name\()_proc_info,#object
__\name\()_proc_info:
.long \cpu_val
.long \cpu_mask
.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_name
.long sa1100_processor_functions
.long v4wb_tlb_fns
.long v4_mc_user_fns
.long v4wb_cache_fns
.size __\name\()_proc_info, . - __\name\()_proc_info
.endm
sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name
sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name
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