2440 休眠唤醒的实现过程（作者：wogoyixikexie@gliet）
//-----------------------------------------------------------------------------------------------------------
// 作者：wogoyixikexie@gliet
// 版权：桂林电子科技大学一系科协wogoyixikexie@gliet
// 平台：wince5.0 2440 5.0 BSP
// 发布日期：2009年3月27日 9:29:16
// 最后修改：
// 注意事项：未经作者同意，不得在转载的时候擅自修改、删除文章的任何部分
//-----------------------------------------------------------------------------------------------------------
这周开始看电源管理的知识，发现相当复杂，现在先在电源管理的外围走一圈，看看2440的休眠挂起是如何实现的，然后就会好好研究微软提供的PM代码。
一般情况下，PDA、手机都是通过一个按键来实现休眠唤醒的，现在来看看PB帮助文档。
Suspend State
When a device is asked to suspend, it is being asked to remain powered to the point that RAM is in a self-refresh state where an interrupt can wake the device. The suspend process can occur in three ways:
- The keyboard driver issues a VK_OFF to GWES. This eventually causes GwesPowerOffSystem to be called.
- The OEM can call GwesPowerOffSystem directly.
- The OEM can call SetSystemPowerState.
The GwesPowerOff function performs key operations before a device can suspend.
To suspend a device
- Notify the Taskbar that the device is being suspended.
Post the WM_POWERBROADCAST message with the flag PBT_APMSUSPEND. Only the registered Taskbar will get this message.
- Abort calibration if the calibration screen is up and in one of the following states:
- Waiting at cross hairs.
- If calibration was waiting at confirmation.
- Turn off window message queues, stopping the processing of messages.
- Determine if the Startup UI screen needs to appear on resume.
- Save video RAM to system RAM is necessary to preserve state on resume.
- Call SetSystemPowerState with the arguments (NULL, POWER_STATE_SUSPEND, POWER_FORCE). This calls into the power manager that coordinates the rest of the suspend operation. At this point, GwesPowerOff is not completed until the system resumes.
- Power manager performs the following actions:
- Calls FileSystemPowerFunction(FSNOTIFY_POWER_OFF) to power off file system drivers.
- Calls PowerOffSystem.
- Calls Sleep(0) to allow the kernel scheduler to run and perform the final suspend process.
- The kernel performs the following final steps to suspend:
- Power off GWES process.
- Power off Filesys.exe.
- If this is an SHx microprocessor, call OEMFlushCache.
- Call OEMPowerOff.
我们的键盘是使用IO中断而已，所以我们Call SetSystemPowerState with the arguments (NULL, POWER_STATE_SUSPEND, POWER_FORCE). SetSystemPowerState 函数会调用BSP的OEMPowerOff函数。
现在来看看OALCPUPowerOff这个函数吧。
C:\WINCE500\PLATFORM\SMDK2440A\Src\Kernel\Oal\startup.s(172): LEAF_ENTRY OALCPUPowerOff
LEAF_ENTRY OALCPUPowerOff
; 1. Push SVC state onto our stack
stmdb sp!, {r4-r12}
stmdb sp!, {lr}
; 2. Save MMU & CPU Register to RAM
ldr r3, =SLEEPDATA_BASE_VIRTUAL ; base of Sleep mode storage
ldr r2, =Awake_address ; store Virtual return address
str r2, [r3], #4
mrc p15, 0, r2, c1, c0, 0 ; load r2 with MMU Control
ldr r0, =MMU_CTL_MASK ; mask off the undefined bits
bic r2, r2, r0
str r2, [r3], #4 ; store MMU Control data
mrc p15, 0, r2, c2, c0, 0 ; load r2 with TTB address.
ldr r0, =MMU_TTB_MASK ; mask off the undefined bits
bic r2, r2, r0
str r2, [r3], #4 ; store TTB address
mrc p15, 0, r2, c3, c0, 0 ; load r2 with domain access control.
str r2, [r3], #4 ; store domain access control
str sp, [r3], #4 ; store SVC stack pointer
mrs r2, spsr
str r2, [r3], #4 ; store SVC status register
mov r1, #Mode_FIQ:OR:I_Bit:OR:F_Bit ; Enter FIQ mode, no interrupts
msr cpsr, r1
mrs r2, spsr
stmia r3!, {r2, r8-r12, sp, lr} ; store the FIQ mode registers
mov r1, #Mode_ABT:OR:I_Bit:OR:F_Bit ; Enter ABT mode, no interrupts
msr cpsr, r1
mrs r0, spsr
stmia r3!, {r0, sp, lr} ; store the ABT mode Registers
mov r1, #Mode_IRQ:OR:I_Bit:OR:F_Bit ; Enter IRQ mode, no interrupts
msr cpsr, r1
mrs r0, spsr
stmia r3!, {r0, sp, lr} ; store the IRQ Mode Registers
mov r1, #Mode_UND:OR:I_Bit:OR:F_Bit ; Enter UND mode, no interrupts
msr cpsr, r1
mrs r0, spsr
stmia r3!, {r0, sp, lr} ; store the UND mode Registers
mov r1, #Mode_SYS:OR:I_Bit:OR:F_Bit ; Enter SYS mode, no interrupts
msr cpsr, r1
stmia r3!, {sp, lr} ; store the SYS mode Registers
mov r1, #Mode_SVC:OR:I_Bit:OR:F_Bit ; Back to SVC mode, no interrupts
msr cpsr, r1
; 3. do Checksum on the Sleepdata
ldr r3, =SLEEPDATA_BASE_VIRTUAL ; get pointer to SLEEPDATA
ldr r2, =0x0
ldr r0, =(SLEEPDATA_SIZE-1) ; get size of data structure (in words)
30
ldr r1, [r3], #4
and r1, r1, #0x1
mov r1, r1, ROR #31
add r2, r2, r1
subs r0, r0, #1
bne %b30
ldr r0, =vGPIOBASE
;;;add r2, r2, #1 ; test checksum of the Sleep data error
str r2, [r0, #oGSTATUS3] ; Store in Power Manager Scratch pad register
ldr r0, =vGPIOBASE
ldr r1, =0x550a
str r1, [r0, #oGPFCON]
ldr r1, =0x30
str r1, [r0, #oGPFDAT]
; 4. Interrupt Disable
ldr r0, =vINTBASE
mvn r2, #0
str r2, [r0, #oINTMSK]
str r2, [r0, #oSRCPND]
str r2, [r0, #oINTPND]
;; 5. Cache Flush
bl OALClearUTLB
bl OALFlushICache
ldr r0, = (DCACHE_LINES_PER_SET - 1)
ldr r1, = (DCACHE_NUM_SETS - 1)
ldr r2, = DCACHE_SET_INDEX_BIT
ldr r3, = DCACHE_LINE_SIZE
bl OALFlushDCache
; 6. Setting Wakeup External Interrupt(EINT0,1,2) Mode
ldr r0, =vGPIOBASE
ldr r1, =0x550a
str r1, [r0, #oGPFCON]
; ldr r1, =0x55550100
; str r1, [r0, #oGPGCON]
; 7. Go to Power-Off Mode
ldr r0, =vMISCCR ; hit the TLB
ldr r0, [r0]
ldr r0, =vCLKCON
ldr r0, [r0]
ldr r0, =vREFRESH
ldr r1, [r0] ; r1=rREFRESH
orr r1, r1, #(1 << 22)
ldr r2, =vMISCCR
ldr r3, [r2]
orr r3, r3, #(3<<17) ; Make sure that SCLK0:SCLK->0, SCLK1:SCLK->0, SCKE=L during boot-up
bic r3, r3, #(7<<20)
orr r3, r3, #(6<<20)
ldr r4, =vCLKCON
ldr r5, =0x1ffff8 ; Power Off Mode
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Sometimes it is not working in cache mode. So I modify to jump to ROM area.
;
;;; ldr r6, =0x92000000 ; make address to 0x9200 0020
;;; add r6, r6, #0x20 ;
;;; mov pc, r6 ; jump to Power off code in ROM
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
b SelfRefreshAndPowerOff
ALIGN 32 ; for I-Cache Line(32Byte, 8 Word)
SelfRefreshAndPowerOff ; run with Instruction Cache's code
str r1, [r0] ; Enable SDRAM self-refresh
str r3, [r2] ; MISCCR Setting
str r5, [r4] ; Power Off !!
b .
;;; LTORG
; This point is called from EBOOT's startup code(MMU is enabled)
; in this routine, left information(REGs, INTMSK, INTSUBMSK ...)
Awake_address
; 1. Recover CPU Registers
ldr r3, =SLEEPDATA_BASE_VIRTUAL ; Sleep mode information data structure
add r2, r3, #SleepState_FIQ_SPSR
mov r1, #Mode_FIQ:OR:I_Bit:OR:F_Bit ; Enter FIQ mode, no interrupts - also FIQ
msr cpsr, r1
ldr r0, [r2], #4
msr spsr, r0
ldr r8, [r2], #4
ldr r9, [r2], #4
ldr r10, [r2], #4
ldr r11, [r2], #4
ldr r12, [r2], #4
ldr sp, [r2], #4
ldr lr, [r2], #4
mov r1, #Mode_ABT:OR:I_Bit ; Enter ABT mode, no interrupts
msr cpsr, r1
ldr r0, [r2], #4
msr spsr, r0
ldr sp, [r2], #4
ldr lr, [r2], #4
mov r1, #Mode_IRQ:OR:I_Bit ; Enter IRQ mode, no interrupts
msr cpsr, r1
ldr r0, [r2], #4
msr spsr, r0
ldr sp, [r2], #4
ldr lr, [r2], #4
mov r1, #Mode_UND:OR:I_Bit ; Enter UND mode, no interrupts
msr cpsr, r1
ldr r0, [r2], #4
msr spsr, r0
ldr sp, [r2], #4
ldr lr, [r2], #4
mov r1, #Mode_SYS:OR:I_Bit ; Enter SYS mode, no interrupts
msr cpsr, r1
ldr sp, [r2], #4
ldr lr, [r2]
mov r1, #Mode_SVC:OR:I_Bit ; Enter SVC mode, no interrupts - FIQ is available
msr cpsr, r1
ldr r0, [r3, #SleepState_SVC_SPSR]
msr spsr, r0
; 2. Recover Last mode's REG's, & go back to caller of OALCPUPowerOff()
ldr sp, [r3, #SleepState_SVC_SP]
ldr lr, [sp], #4
ldmia sp!, {r4-r12}
mov pc, lr ; and now back to our sponsors
ENTRY_END
//------------------------------------------------------------------------------
//
// Function: OEMPowerOff
//
// Description: Called when the system is to transition to it's lowest
// power mode (off)
//
void OEMPowerOff()
{
static UINT32 saveArea[51];
S3C2440A_INTR_REG *pIntr = (S3C2440A_INTR_REG*)OALPAtoVA(S3C2440A_BASE_REG_PA_INTR, FALSE);
S3C2440A_IOPORT_REG *pIOPort = (S3C2440A_IOPORT_REG*)OALPAtoVA(S3C2440A_BASE_REG_PA_IOPORT, FALSE);
S3C2440A_LCD_REG *pLCD = (S3C2440A_LCD_REG*)OALPAtoVA(S3C2440A_BASE_REG_PA_LCD, FALSE);
// First do platform specific actions
BSPPowerOff();
// Then save system registers
saveArea[0] = INPORT32(&pIOPort->GPACON);
saveArea[1] = INPORT32(&pIOPort->GPADAT);
saveArea[2] = INPORT32(&pIOPort->GPBCON);
saveArea[3] = INPORT32(&pIOPort->GPBDAT);
saveArea[4] = INPORT32(&pIOPort->GPBUP);
saveArea[5] = INPORT32(&pIOPort->GPCCON);
saveArea[6] = INPORT32(&pIOPort->GPCDAT);
saveArea[7] = INPORT32(&pIOPort->GPCUP);
saveArea[8] = INPORT32(&pIOPort->GPDCON);
saveArea[9] = INPORT32(&pIOPort->GPDDAT);
saveArea[10] = INPORT32(&pIOPort->GPDUP);
saveArea[11] = INPORT32(&pIOPort->GPECON);
saveArea[12] = INPORT32(&pIOPort->GPEDAT);
saveArea[13] = INPORT32(&pIOPort->GPEUP);
saveArea[14] = INPORT32(&pIOPort->GPFCON);
saveArea[15] = INPORT32(&pIOPort->GPFDAT);
saveArea[16] = INPORT32(&pIOPort->GPFUP);
saveArea[17] = INPORT32(&pIOPort->GPGCON);
saveArea[18] = INPORT32(&pIOPort->GPGDAT);
saveArea[19] = INPORT32(&pIOPort->GPGUP);
saveArea[20] = INPORT32(&pIOPort->GPHCON);
saveArea[21] = INPORT32(&pIOPort->GPHDAT);
saveArea[22] = INPORT32(&pIOPort->GPHUP);
saveArea[23] = INPORT32(&pIOPort->MISCCR);
saveArea[24] = INPORT32(&pIOPort->DCLKCON);
saveArea[25] = INPORT32(&pIOPort->EXTINT0);
saveArea[26] = INPORT32(&pIOPort->EXTINT1);
saveArea[27] = INPORT32(&pIOPort->EXTINT2);
saveArea[28] = INPORT32(&pIOPort->EINTFLT0);
saveArea[29] = INPORT32(&pIOPort->EINTFLT1);
saveArea[30] = INPORT32(&pIOPort->EINTFLT2);
saveArea[31] = INPORT32(&pIOPort->EINTFLT3);
saveArea[32] = INPORT32(&pIOPort->EINTMASK);
saveArea[33] = INPORT32(&pIntr->INTMOD);
saveArea[34] = INPORT32(&pIntr->INTMSK);
saveArea[35] = INPORT32(&pIntr->INTSUBMSK);
saveArea[36] = INPORT32(&pLCD->TCONSEL);
saveArea[37] = INPORT32(&pLCD->LCDINTMSK);
saveArea[38] = INPORT32(&pLCD->TPAL);
saveArea[39] = INPORT32(&pLCD->DITHMODE);
saveArea[40] = INPORT32(&pLCD->BLUELUT);
saveArea[41] = INPORT32(&pLCD->GREENLUT);
saveArea[42] = INPORT32(&pLCD->REDLUT);
saveArea[43] = INPORT32(&pLCD->LCDSADDR3);
saveArea[44] = INPORT32(&pLCD->LCDSADDR2);
saveArea[45] = INPORT32(&pLCD->LCDSADDR1);
saveArea[46] = INPORT32(&pLCD->LCDCON5);
saveArea[47] = INPORT32(&pLCD->LCDCON4);
saveArea[48] = INPORT32(&pLCD->LCDCON3);
saveArea[49] = INPORT32(&pLCD->LCDCON2);
saveArea[50] = INPORT32(&pLCD->LCDCON1);
pLCD->LCDCON1 = 0;
pLCD->LCDCON2 = 0;
pLCD->LCDCON3 = 0;
pLCD->LCDCON4 = 0;
pLCD->LCDCON5 = 0;
pLCD->LCDSADDR1 = 0;
pLCD->LCDSADDR2 = 0;
pLCD->LCDSADDR3 = 0;
pLCD->TCONSEL = 0;
pLCD->TPAL = 0;
ConfigStopGPIO();//里面根据电路板的连接情况设置IO，把GPF0配置成中断EINT0
// Switch off power for KITL device
OALKitlPowerOff();
// Go to power off mode
//该函数在startup.s使2440真正进入sleep模式，在里面设置好唤醒中断源，并且最后用B.等待中断，一旦产生中断就进入bootloader
OALCPUPowerOff();
// 奇怪，在OALCPUPowerOff里面有个B.，一旦产生中断还会回来这里执行下面的吗？如果不会执行那很多寄存器都恢复不了？
// Switch on power for KITL device
OALKitlPowerOn();
/* Recover Process, Load CPU Regs */
OUTPORT32(&pIOPort->GPACON, saveArea[0]);
OUTPORT32(&pIOPort->GPADAT, saveArea[1]);
OUTPORT32(&pIOPort->GPBCON, saveArea[2]);
OUTPORT32(&pIOPort->GPBDAT, saveArea[3]);
OUTPORT32(&pIOPort->GPBUP, saveArea[4]);
OUTPORT32(&pIOPort->GPCCON, saveArea[5]);
OUTPORT32(&pIOPort->GPCDAT, saveArea[6]);
OUTPORT32(&pIOPort->GPCUP, saveArea[7]);
OUTPORT32(&pIOPort->GPDCON, saveArea[8]);
OUTPORT32(&pIOPort->GPDDAT, saveArea[9]);
OUTPORT32(&pIOPort->GPDUP, saveArea[10]);
OUTPORT32(&pIOPort->GPECON, saveArea[11]);
OUTPORT32(&pIOPort->GPEDAT, saveArea[12]);
OUTPORT32(&pIOPort->GPEUP, saveArea[13]);
OUTPORT32(&pIOPort->GPFCON, saveArea[14]);
OUTPORT32(&pIOPort->GPFDAT, saveArea[15]);
OUTPORT32(&pIOPort->GPFUP, saveArea[16]);
OUTPORT32(&pIOPort->GPGCON, saveArea[17]);
OUTPORT32(&pIOPort->GPGDAT, saveArea[18]);
OUTPORT32(&pIOPort->GPGUP, saveArea[19]);
OUTPORT32(&pIOPort->GPHCON, saveArea[20]);
OUTPORT32(&pIOPort->GPHDAT, saveArea[21]);
OUTPORT32(&pIOPort->GPHUP, saveArea[22]);
OUTPORT32(&pIOPort->MISCCR, saveArea[23]);
OUTPORT32(&pIOPort->DCLKCON, saveArea[24]);
OUTPORT32(&pIOPort->EXTINT0, saveArea[25]);
OUTPORT32(&pIOPort->EXTINT1, saveArea[26]);
OUTPORT32(&pIOPort->EXTINT2, saveArea[27]);
OUTPORT32(&pIOPort->EINTFLT0, saveArea[28]);
OUTPORT32(&pIOPort->EINTFLT1, saveArea[29]);
OUTPORT32(&pIOPort->EINTFLT2, saveArea[30]);
OUTPORT32(&pIOPort->EINTFLT3, saveArea[31]);
OUTPORT32(&pIOPort->EINTMASK, saveArea[32]);
OUTPORT32(&pIntr->INTMOD, saveArea[33]);
OUTPORT32(&pIntr->INTMSK, saveArea[34]);
OUTPORT32(&pIntr->INTSUBMSK, saveArea[35]);
pLCD->TCONSEL = saveArea[36];
pLCD->LCDINTMSK = saveArea[37];
pLCD->TPAL = saveArea[38];
pLCD->DITHMODE = saveArea[39];
pLCD->BLUELUT = saveArea[40];
pLCD->GREENLUT = saveArea[41];
pLCD->REDLUT = saveArea[42];
pLCD->LCDSADDR3 = saveArea[43];
pLCD->LCDSADDR2 = saveArea[44];
pLCD->LCDSADDR1 = saveArea[45];
pLCD->LCDCON5 = saveArea[46];
pLCD->LCDCON4 = saveArea[47];
pLCD->LCDCON3 = saveArea[48];
pLCD->LCDCON2 = saveArea[49];
pLCD->LCDCON1 = saveArea[50];
/* Interrupt Clear */
OUTPORT32(&pIOPort->EINTPEND, INPORT32(&pIOPort->EINTPEND));
OUTPORT32(&pIntr->SUBSRCPND, INPORT32(&pIntr->SUBSRCPND));
OUTPORT32(&pIntr->SRCPND, INPORT32(&pIntr->SRCPND));
OUTPORT32(&pIntr->INTPND, INPORT32(&pIntr->INTPND));
pLCD->LCDSRCPND = pLCD->LCDSRCPND;
pLCD->LCDINTPND = pLCD->LCDINTPND;
// Do platform dependent power on actions
BSPPowerOn();
}
//------------------------------------------------------------------------------