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- UID
- 1029342
- 性别
- 男
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nop
nop
nop /* wait until upll has the effect */
nop
nop
/* PLL setup */
ldr r1, =_mpllcon
str r1, [r0, #oMPLLCON]
/* configure memory */
bl memset
/* Power Manage Check if this is a wake-up from sleep */
ldr r1, PMST_ADDR
ldr r0, [r1]
@bic r0,r0,#0xfffffffd
tst r0, #(0x02)
bne WakeupStart
WakeupStart:
/* Clear sleep reset bit */
ldr r0, PMST_ADDR
mov r1, #0x0 @PMST_SMR
str r1, [r0]
ldr r0, PMCTL1_ADDR /* Release the SDRAM signal protections */
ldr r1, =0x00010330
str r1, [r0]
ldr r0, =0x48000024
ldr r1, [r0]
bic r1, r1, #0x400000
str r1, [r0]
mov r1, #0x1000
1: subs r1, r1, #1 /* wait until the SelfRefresh is released. */
bne 1b
/* Go... */
ldr r0, =0x560000B8 /* read a return address go to s3c2410_cpu_resume*/
ldr r1, [r0]
mov pc, r1
nop
nop
1: b 1b /* infinite loop */
2、Kernel部分
1. 唤醒程序汇编部分（arch/arm/mach-s3c2410/sleep.s）
resume_with_mmu:
ldmfd sp!, { r4 - r12, pc }
.ltorg
.data
.global s3c2410_sleep_save_phys
s3c2410_sleep_save_phys:
.word 0
ENTRY(s3c2410_cpu_resume)
mov r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE
msr cpsr_c, r0
mov r2, #S3C24XX_PA_UART & 0xff000000
orr r2, r2, #S3C24XX_PA_UART & 0xff000
#if 0
/* SMDK2440 LED set */
mov r14, #S3C24XX_PA_GPIO
ldr r12, [ r14, #0x54 ]
bic r12, r12, #3<<4
orr r12, r12, #1<<7
str r12, [ r14, #0x54 ]
#endif
#ifdef CONFIG_DEBUG_RESUME
mov r3, #'L'
strb r3, [ r2, #S3C2410_UTXH ]
1001:
ldrb r14, [ r3, #S3C2410_UTRSTAT ]
tst r14, #S3C2410_UTRSTAT_TXE
beq 1001b
#endif /* CONFIG_DEBUG_RESUME */
mov r1, #0
mcr p15, 0, r1, c8, c7, 0 @@ invalidate I & D TLBs
mcr p15, 0, r1, c7, c7, 0 @@ invalidate I & D caches
ldr r0, s3c2410_sleep_save_phys @ address of restore block
ldmia r0, { r4 - r13 }
mcr p15, 0, r4, c15, c1, 0 @ CP access register
mcr p15, 0, r5, c13, c0, 0 @ PID
mcr p15, 0, r6, c3, c0, 0 @ Domain ID
mcr p15, 0, r7, c2, c0, 0 @ translation table base
#ifdef CONFIG_DEBUG_RESUME
mov r3, #'R'
strb r3, [ r2, #S3C2410_UTXH ]
#endif
ldr r2, =resume_with_mmu
mcr p15, 0, r8, c1, c0, 0 @ turn on MMU, etc
nop @ second-to-last before mmu
mov pc, r2 @ go back to virtual address
.ltorg
2. 唤醒恢复设置阶段（arch/arm/mach-s3c2410/pm.c）
static int s3c2410_pm_enter(suspend_state_t state) //该函数后半部分引导配置系统
cpu_init(); //CPU初始化
tmp = __raw_readl(S3C2410_GSTATUS2);
tmp &= S3C2410_GSTATUS2_OFFRESET;
__raw_writel(tmp, S3C2410_GSTATUS2); //清除唤醒复位标记
s3c2410_pm_do_restore_core(core_save, ARRAY_SIZE(core_save)); //恢复核心配置
s3c2410_pm_do_restore(gpio_save, ARRAY_SIZE(gpio_save)); //恢复io口配置
s3c2410_pm_do_restore(irq_save, ARRAY_SIZE(irq_save)); //恢复中断配置
s3c2410_pm_do_restore(uart_save, ARRAY_SIZE(uart_save)); //恢复串口配置
s3c2410_pm_debug_init(); //串口调试函数初始化
DBG("post sleep: IRQs 0x%08x, 0x%08x\n",
__raw_readl(S3C2410_SRCPND),
__raw_readl(S3C2410_EINTPEND)); //打印信息
s3c2410_pm_show_resume_irqs(IRQ_EINT0, __raw_readl(S3C2410_SRCPND),
s3c_irqwake_intmask); //查看中断唤醒源信息
s3c2410_pm_show_resume_irqs(IRQ_EINT4-4, __raw_readl(S3C2410_EINTPEND),
s3c_irqwake_eintmask); //查看中断唤醒源信息
DBG("post sleep, preparing to return\n");
s3c2410_pm_check_restore();//如果需要在sleep前检查ram则此函数会运行，否则此函数为空，即如果CONFIG_S3C2410_PM_CHECK被定义。
DBG("S3C2410 PM Resume (post-restore)\n");
return 0;
3. 恢复系统
A.开启外设驱动电源（drivers/base/power/resume.c）
int device_power_up(pm_message_t state) //该函数使所有设备驱动sleep
B.启动系统进程（kernel/power/ console.c）
void pm_restore_console(void) //该函数使所有系统进程休眠或关闭。
4. 内核接口文件（arch/arm/kernel/apm.c）
由原接口退出sleep模式。
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