mirror of
https://github.com/adulau/aha.git
synced 2024-12-28 03:36:19 +00:00
bd117bd161
Add the initial support for the S3C64XX based systems to use suspend-to-RAM to sleep. Includes basic debugging for use with the SMDK6410 usign the LEDs on the baseboard. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
144 lines
4.2 KiB
ArmAsm
144 lines
4.2 KiB
ArmAsm
/* linux/0arch/arm/plat-s3c64xx/sleep.S
|
|
*
|
|
* Copyright 2008 Openmoko, Inc.
|
|
* Copyright 2008 Simtec Electronics
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
* http://armlinux.simtec.co.uk/
|
|
*
|
|
* S3C64XX CPU sleep code
|
|
*
|
|
* 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 <asm/assembler.h>
|
|
#include <mach/map.h>
|
|
|
|
#undef S3C64XX_VA_GPIO
|
|
#define S3C64XX_VA_GPIO (0x0)
|
|
|
|
#include <plat/regs-gpio.h>
|
|
#include <plat/gpio-bank-n.h>
|
|
|
|
#define LL_UART (S3C_PA_UART + (0x400 * CONFIG_S3C_LOWLEVEL_UART_PORT))
|
|
|
|
.text
|
|
|
|
/* s3c_cpu_save
|
|
*
|
|
* Save enough processor state to allow the restart of the pm.c
|
|
* code after resume.
|
|
*
|
|
* entry:
|
|
* r0 = pointer to the save block
|
|
*/
|
|
|
|
ENTRY(s3c_cpu_save)
|
|
stmfd sp!, { r4 - r12, lr }
|
|
|
|
mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID
|
|
mrc p15, 0, r5, c3, c0, 0 @ Domain ID
|
|
mrc p15, 0, r6, c2, c0, 0 @ Translation Table BASE0
|
|
mrc p15, 0, r7, c2, c0, 1 @ Translation Table BASE1
|
|
mrc p15, 0, r8, c2, c0, 2 @ Translation Table Control
|
|
mrc p15, 0, r9, c1, c0, 0 @ Control register
|
|
mrc p15, 0, r10, c1, c0, 1 @ Auxiliary control register
|
|
mrc p15, 0, r11, c1, c0, 2 @ Co-processor access controls
|
|
|
|
stmia r0, { r4 - r13 } @ Save CP registers and SP
|
|
|
|
@@ save our state to ram
|
|
bl s3c_pm_cb_flushcache
|
|
|
|
@@ call final suspend code
|
|
ldr r0, =pm_cpu_sleep
|
|
ldr pc, [r0]
|
|
|
|
@@ return to the caller, after the MMU is turned on.
|
|
@@ restore the last bits of the stack and return.
|
|
resume_with_mmu:
|
|
ldmfd sp!, { r4 - r12, pc } @ return, from sp from s3c_cpu_save
|
|
|
|
.data
|
|
|
|
/* the next bit is code, but it requires easy access to the
|
|
* s3c_sleep_save_phys data before the MMU is switched on, so
|
|
* we store the code that needs this variable in the .data where
|
|
* the value can be written to (the .text segment is RO).
|
|
*/
|
|
|
|
.global s3c_sleep_save_phys
|
|
s3c_sleep_save_phys:
|
|
.word 0
|
|
|
|
/* Sleep magic, the word before the resume entry point so that the
|
|
* bootloader can check for a resumeable image. */
|
|
|
|
.word 0x2bedf00d
|
|
|
|
/* s3c_cpu_reusme
|
|
*
|
|
* This is the entry point, stored by whatever method the bootloader
|
|
* requires to get the kernel runnign again. This code expects to be
|
|
* entered with no caches live and the MMU disabled. It will then
|
|
* restore the MMU and other basic CP registers saved and restart
|
|
* the kernel C code to finish the resume code.
|
|
*/
|
|
|
|
ENTRY(s3c_cpu_resume)
|
|
msr cpsr_c, #PSR_I_BIT | PSR_F_BIT | SVC_MODE
|
|
ldr r2, =LL_UART /* for debug */
|
|
|
|
#ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
|
|
/* Initialise the GPIO state if we are debugging via the SMDK LEDs,
|
|
* as the uboot version supplied resets these to inputs during the
|
|
* resume checks.
|
|
*/
|
|
|
|
ldr r3, =S3C64XX_PA_GPIO
|
|
ldr r0, [ r3, #S3C64XX_GPNCON ]
|
|
bic r0, r0, #(S3C64XX_GPN_CONMASK(12) | S3C64XX_GPN_CONMASK(13) | \
|
|
S3C64XX_GPN_CONMASK(14) | S3C64XX_GPN_CONMASK(15))
|
|
orr r0, r0, #(S3C64XX_GPN_OUTPUT(12) | S3C64XX_GPN_OUTPUT(13) | \
|
|
S3C64XX_GPN_OUTPUT(14) | S3C64XX_GPN_OUTPUT(15))
|
|
str r0, [ r3, #S3C64XX_GPNCON ]
|
|
|
|
ldr r0, [ r3, #S3C64XX_GPNDAT ]
|
|
bic r0, r0, #0xf << 12 @ GPN12..15
|
|
orr r0, r0, #1 << 15 @ GPN15
|
|
str r0, [ r3, #S3C64XX_GPNDAT ]
|
|
#endif
|
|
|
|
/* __v6_setup from arch/arm/mm/proc-v6.S, ensure that the caches
|
|
* are thoroughly cleaned just in case the bootloader didn't do it
|
|
* for us. */
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c14, 0 @ clean+invalidate D cache
|
|
mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
|
|
mcr p15, 0, r0, c7, c15, 0 @ clean+invalidate cache
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
|
|
@@mcr p15, 0, r0, c8, c7, 0 @ invalidate I + D TLBs
|
|
@@mcr p15, 0, r0, c7, c7, 0 @ Invalidate I + D caches
|
|
|
|
ldr r0, s3c_sleep_save_phys
|
|
ldmia r0, { r4 - r13 }
|
|
|
|
mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID
|
|
mcr p15, 0, r5, c3, c0, 0 @ Domain ID
|
|
mcr p15, 0, r6, c2, c0, 0 @ Translation Table BASE0
|
|
mcr p15, 0, r7, c2, c0, 1 @ Translation Table BASE1
|
|
mcr p15, 0, r8, c2, c0, 2 @ Translation Table Control
|
|
mcr p15, 0, r10, c1, c0, 1 @ Auxiliary control register
|
|
|
|
mov r0, #0 @ restore copro access controls
|
|
mcr p15, 0, r11, c1, c0, 2 @ Co-processor access controls
|
|
mcr p15, 0, r0, c7, c5, 4
|
|
|
|
ldr r2, =resume_with_mmu
|
|
mcr p15, 0, r9, c1, c0, 0 /* turn mmu back on */
|
|
nop
|
|
mov pc, r2 /* jump back */
|
|
|
|
.end
|