2440 休眠喚醒的實現(xiàn)過程（作者：wogoyixikexie@gliet）

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// 作者：wogoyixikexie@gliet

// 版權(quán)：桂林電子科技大學一系科協(xié)wogoyixikexie@gliet

// 平臺：wince5.0 2440 5.0 BSP

// 發(fā)布日期：2009年3月27日 9:29:16

// 最后修改：

// 注意事項：未經(jīng)作者同意，不得在轉(zhuǎn)載的時候擅自修改、刪除文章的任何部分

//-----------------------------------------------------------------------------------------------------------

?????這周開始看電源管理的知識，發(fā)現(xiàn)相當復雜，現(xiàn)在先在電源管理的外圍走一圈，看看2440的休眠掛起是如何實現(xiàn)的，然后就會好好研究微軟提供的PM代碼。

?????一般情況下，PDA、手機都是通過一個按鍵來實現(xiàn)休眠喚醒的，現(xiàn)在來看看PB幫助文檔。

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.

?????我們的鍵盤是使用IO中斷而已，所以我們Call SetSystemPowerState with the arguments (NULL, POWER_STATE_SUSPEND, POWER_FORCE). SetSystemPowerState 函數(shù)會調(diào)用BSP的OEMPowerOff函數(shù)。

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??????現(xiàn)在來看看OALCPUPowerOff這個函數(shù)吧。

C:\WINCE500\PLATFORM\SMDK2440A\Src\Kernel\Oal\startup.s(172):?LEAF_ENTRY OALCPUPowerOff

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?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();//里面根據(jù)電路板的連接情況設置IO，把GPF0配置成中斷EINT0

??? // Switch off power for KITL device
??? OALKitlPowerOff();
???
??? // Go to power off mode

?????//該函數(shù)在startup.s使2440真正進入sleep模式，在里面設置好喚醒中斷源，并且最后用B.等待中斷，一旦產(chǎn)生中斷就進入bootloader
??? OALCPUPowerOff();??

?????// 奇怪，在OALCPUPowerOff里面有個B.，一旦產(chǎn)生中斷還會回來這里執(zhí)行下面的嗎？如果不會執(zhí)行那很多寄存器都恢復不了？

? // 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();
}

//------------------------------------------------------------------------------

?

?

轉(zhuǎn)載于:https://www.cnblogs.com/gooogleman/archive/2010/11/05/1869694.html

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