/* sleep.S: power saving mode entry
*
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Woodhouse (dwmw2@infradead.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/errno.h>
#include <asm/cache.h>
#include <asm/spr-regs.h>
#define __addr_MASK 0xfeff9820 /* interrupt controller mask */
#define __addr_FR55X_DRCN 0xfeff0218 /* Address of DRCN register */
#define FR55X_DSTS_OFFSET -4 /* Offset from DRCN to DSTS */
#define FR55X_SDRAMC_DSTS_SSI 0x00000002 /* indicates that the SDRAM is in self-refresh mode */
#define __addr_FR4XX_DRCN 0xfe000430 /* Address of DRCN register */
#define FR4XX_DSTS_OFFSET -8 /* Offset from DRCN to DSTS */
#define FR4XX_SDRAMC_DSTS_SSI 0x00000001 /* indicates that the SDRAM is in self-refresh mode */
#define SDRAMC_DRCN_SR 0x00000001 /* transition SDRAM into self-refresh mode */
.section .bss
.balign 8
.globl __sleep_save_area
__sleep_save_area:
.space 16
.text
.balign 4
.macro li v r
sethi.p %hi(\v),\r
setlo %lo(\v),\r
.endm
#ifdef CONFIG_PM
###############################################################################
#
# CPU suspension routine
# - void frv_cpu_suspend(unsigned long pdm_mode)
#
###############################################################################
.globl frv_cpu_suspend
.type frv_cpu_suspend,@function
frv_cpu_suspend:
#----------------------------------------------------
# save hsr0, psr, isr, and lr for resume code
#----------------------------------------------------
li __sleep_save_area,gr11
movsg hsr0,gr4
movsg psr,gr5
movsg isr,gr6
movsg lr,gr7
stdi gr4,@(gr11,#0)
stdi gr6,@(gr11,#8)
# store the return address from sleep in GR14, and its complement in GR13 as a check
li __ramboot_resume,gr14
#ifdef CONFIG_MMU
# Resume via RAMBOOT# will turn MMU off, so bootloader needs a physical address.
sethi.p %hi(__page_offset),gr13
setlo %lo(__page_offset),gr13
sub gr14,gr13,gr14
#endif
not gr14,gr13
#----------------------------------------------------
# preload and lock into icache that code which may have to run
# when dram is in self-refresh state.
#----------------------------------------------------
movsg hsr0, gr3
li HSR0_ICE,gr4
or gr3,gr4,gr3
movgs gr3,hsr0
or gr3,gr8,gr7 // add the sleep bits for later
li #__icache_lock_start,gr3
li #__icache_lock_end,gr4
1: icpl gr3,gr0,#1
addi gr3,#L1_CACHE_BYTES,gr3
cmp gr4,gr3,icc0
bhi icc0,#0,1b
# disable exceptions
movsg psr,gr8
andi.p gr8,#~PSR_PIL,gr8
andi gr8,~PSR_ET,gr8
movgs gr8,psr
ori gr8,#PSR_ET,gr8
srli gr8,#28,gr4
subicc gr4,#3,gr0,icc0
beq icc0,#0,1f
# FR4xx
li __addr_FR4XX_DRCN,gr4
li FR4XX_SDRAMC_DSTS_SSI,gr5
li FR4XX_DSTS_OFFSET,gr6
bra __icache_lock_start
1:
# FR5xx
li __addr_FR55X_DRCN,gr4
li FR55X_SDRAMC_DSTS_SSI,gr5
li FR55X_DSTS_OFFSET,gr6
bra __icache_lock_start
.size frv_cpu_suspend, .-frv_cpu_suspend
#
# the final part of the sleep sequence...
# - we want it to be be cacheline aligned so we can lock it into the icache easily
# On entry: gr7 holds desired hsr0 sleep value
# gr8 holds desired psr sleep value
#
.balign L1_CACHE_BYTES
.type __icache_lock_start,@function
__icache_lock_start:
#----------------------------------------------------
# put SDRAM in self-refresh mode
#----------------------------------------------------
# Flush all data in the cache using the DCEF instruction.
dcef @(gr0,gr0),#1
# Stop DMAC transfer
# Execute dummy load from SDRAM
ldi @(gr11,#0),gr11
# put the SDRAM into self-refresh mode
ld @(gr4,gr0),gr11
ori gr11,#SDRAMC_DRCN_SR,gr11
st gr11,@(gr4,gr0)
membar
# wait for SDRAM to reach self-refresh mode
1: ld @(gr4,gr6),gr11
andcc gr11,gr5,gr11,icc0
beq icc0,#0,1b
# Set the GPIO register so that the IRQ[3:0] pins become valid, as required.
# Set the clock mode (CLKC register) as required.
# - At this time, also set the CLKC register P0 bit.
# Set the HSR0 register PDM field.
movgs gr7,hsr0
# Execute NOP 32 times.
.rept 32
nop
.endr
#if 0 // Fujitsu recommend to skip this and will update docs.
# Release the interrupt mask setting of the MASK register of the
# interrupt controller if necessary.
sti gr10,@(gr9,#0)
membar
#endif
# Set the PSR register ET bit to 1 to enable interrupts.
movgs gr8,psr
###################################################
# this is only reached if waking up via interrupt
###################################################
# Execute NOP 32 times.
.rept 32
nop
.endr
#----------------------------------------------------
# wake SDRAM from self-refresh mode
#----------------------------------------------------
ld @(gr4,gr0),gr11
andi gr11,#~SDRAMC_DRCN_SR,gr11
st gr11,@(gr4,gr0)
membar
2:
ld @(gr4,gr6),gr11 // Wait for it to come back...
andcc gr11,gr5,gr0,icc0
bne icc0,0,2b
# wait for the SDRAM to stabilise
li 0x0100000,gr3
3: subicc gr3,#1,gr3,icc0
bne icc0,#0,3b
# now that DRAM is back, this is the end of the code which gets
# locked in icache.
__icache_lock_end:
.size __icache_lock_start, .-__icache_lock_start
# Fall-through to the RAMBOOT# wakeup path
###############################################################################
#
# resume from suspend re-entry point reached via RAMBOOT# and bootloader
#
###############################################################################
__ramboot_resume:
#----------------------------------------------------
# restore hsr0, psr, isr, and leave saved lr in gr7
#----------------------------------------------------
li __sleep_save_area,gr11
#ifdef CONFIG_MMU
movsg hsr0,gr4
sethi.p %hi(HSR0_EXMMU),gr3
setlo %lo(HSR0_EXMMU),gr3
andcc gr3,gr4,gr0,icc0
bne icc0,#0,2f
# need to use physical address
sethi.p %hi(__page_offset),gr3
setlo %lo(__page_offset),gr3
sub gr11,gr3,gr11
# flush all tlb entries
setlos #64,gr4
setlos.p #PAGE_SIZE,gr5
setlos #0,gr6
1:
tlbpr gr6,gr0,#6,#0
subicc.p gr4,#1,gr4,icc0
add gr6,gr5,gr6
bne icc0,#2,1b
# need a temporary mapping for the current physical address we are
# using between time MMU is enabled and jump to virtual address is
# made.
sethi.p %hi(0x00000000),gr4
setlo %lo(0x00000000),gr4 ; physical address
setlos #xAMPRx_L|xAMPRx_M|xAMPRx_SS_256Mb|xAMPRx_S_KERNEL|xAMPRx_V,gr5
or gr4,gr5,gr5
movsg cxnr,gr13
or gr4,gr13,gr4
movgs gr4,iamlr1 ; mapped from real address 0
movgs gr5,iampr1 ; cached kernel memory at 0x00000000
2:
#endif
lddi @(gr11,#0),gr4 ; hsr0, psr
lddi @(gr11,#8),gr6 ; isr, lr
movgs gr4,hsr0
bar
#ifdef CONFIG_MMU
sethi.p %hi(1f),gr11
setlo %lo(1f),gr11
jmpl @(gr11,gr0)
1:
movgs gr0,iampr1 ; get rid of temporary mapping
#endif
movgs gr5,psr
movgs gr6,isr
#----------------------------------------------------
# unlock the icache which was locked before going to sleep
#----------------------------------------------------
li __icache_lock_start,gr3
li __icache_lock_end,gr4
1: icul gr3
addi gr3,#L1_CACHE_BYTES,gr3
cmp gr4,gr3,icc0
bhi icc0,#0,1b
#----------------------------------------------------
# back to business as usual
#----------------------------------------------------
jmpl @(gr7,gr0) ;
#endif /* CONFIG_PM */
###############################################################################
#
# CPU core sleep mode routine
#
###############################################################################
.globl frv_cpu_core_sleep
.type frv_cpu_core_sleep,@function
frv_cpu_core_sleep:
# Preload into icache.
li #__core_sleep_icache_lock_start,gr3
li #__core_sleep_icache_lock_end,gr4
1: icpl gr3,gr0,#1
addi gr3,#L1_CACHE_BYTES,gr3
cmp gr4,gr3,icc0
bhi icc0,#0,1b
bra __core_sleep_icache_lock_start
.balign L1_CACHE_BYTES
__core_sleep_icache_lock_start:
# (1) Set the PSR register ET bit to 0 to disable interrupts.
movsg psr,gr8
andi.p gr8,#~(PSR_PIL),gr8
andi gr8,#~(PSR_ET),gr4
movgs gr4,psr
#if 0 // Fujitsu recommend to skip this and will update docs.
# (2) Set '1' to all bits in the MASK register of the interrupt
# controller and mask interrupts.
sethi.p %hi(__addr_MASK),gr9
setlo %lo(__addr_MASK),gr9
sethi.p %hi(0xffff0000),gr4
setlo %lo(0xffff0000),gr4
ldi @(gr9,#0),gr10
sti gr4,@(gr9,#0)
#endif
# (3) Flush all data in the cache using the DCEF instruction.
dcef @(gr0,gr0),#1
# (4) Execute the memory barrier instruction
membar
# (5) Set the GPIO register so that the IRQ[3:0] pins become valid, as required.
# (6) Set the clock mode (CLKC register) as required.
# - At this time, also set the CLKC register P0 bit.
# (7) Set the HSR0 register PDM field to 001 .
movsg hsr0,gr4
ori gr4,HSR0_PDM_CORE_SLEEP,gr4
movgs gr4,hsr0
# (8) Execute NOP 32 times.
.rept 32
nop
.endr
#if 0 // Fujitsu recommend to skip this and will update docs.
# (9) Release the interrupt mask setting of the MASK register of the
# interrupt controller if necessary.
sti gr10,@(gr9,#0)
membar
#endif
# (10) Set the PSR register ET bit to 1 to enable interrupts.
movgs gr8,psr
__core_sleep_icache_lock_end:
# Unlock from icache
li __core_sleep_icache_lock_start,gr3
li __core_sleep_icache_lock_end,gr4
1: icul gr3
addi gr3,#L1_CACHE_BYTES,gr3
cmp gr4,gr3,icc0
bhi icc0,#0,1b
bralr
.size frv_cpu_core_sleep, .-frv_cpu_core_sleep
