;/*
;************************************************************************************************************
;*				    				     北京精儀達盛科技有限公司
;*                                     	    研    發    部
;*
;*                                 	    http://www.techsine.com
;*
;*--------------------------------------------- 文件信息 ----------------------------------------------------                                      
;*
;* 文件名稱 : 2410INIT.S	
;* 文件功能 : S3C2410 啟動代碼，配置存儲器，ISR，堆棧，初始化C向量地址
;* 補充說明 : 
;*-------------------------------------------- 最新版本信息 -------------------------------------------------
;* 修改作者 : ARM開發小組
;* 修改日期 : 2004/00/00
;* 版本聲明 : V0.1
;*-------------------------------------------- 歷史版本信息 -------------------------------------------------
;* 文件作者 : kwtark(samsung)
;* 創建日期 : 2002/02/25
;* 版本聲明 : ver 0.0
;             2002/03/20: purnnamu: Add some functions for testing STOP,POWER_OFF mode
;             2002/04/10: SJS:sub interrupt disable 0x3ff -> 0x7ff 
;*-----------------------------------------------------------------------------------------------------------
;*************************************************************************************************************
;*/

	GET 2410addr.s
	GET memcfg.s

BIT_SELFREFRESH EQU	(1<<22)

;//Pre-defined constants
USERMODE    EQU 	0x10
FIQMODE     EQU 	0x11
IRQMODE     EQU 	0x12
SVCMODE     EQU 	0x13
ABORTMODE   EQU 	0x17
UNDEFMODE   EQU 	0x1b
MODEMASK    EQU 	0x1f
NOINT       EQU 	0xc0

;//The location of stacks
UserStack	EQU	(_STACK_BASEADDRESS-0x3800)		;//0x33ff4800 ~ 
SVCStack    EQU	(_STACK_BASEADDRESS-0x2800) 	;//0x33ff5800 ~
UndefStack	EQU	(_STACK_BASEADDRESS-0x2400) 	;//0x33ff5c00 ~
AbortStack	EQU	(_STACK_BASEADDRESS-0x2000) 	;//0x33ff6000 ~
IRQStack    EQU	(_STACK_BASEADDRESS-0x1000)		;//0x33ff7000 ~
FIQStack	EQU	(_STACK_BASEADDRESS-0x0)		;//0x33ff8000 ~ 

;//Check if tasm.exe(armasm -16 ...@ADS 1.0) is used.
	GBLL    THUMBCODE
	[ {CONFIG} = 16 
THUMBCODE SETL  {TRUE}
	    CODE32
    	|   
THUMBCODE SETL  {FALSE}
    	]

    	MACRO
	MOV_PC_LR
    	[ THUMBCODE
            bx lr
    	|
            mov	pc,lr
    	]
	MEND

    	MACRO
	MOVEQ_PC_LR
    	[ THUMBCODE
    	    bxeq lr
    	|
            moveq pc,lr
    	]
	MEND

    	MACRO
$HandlerLabel HANDLER $HandleLabel

$HandlerLabel
	sub	sp,sp,#4            ;//decrement sp(to store jump address)
	stmfd	sp!,{r0}        ;//PUSH the work register to stack(lr does't push because it return to original address)
	ldr     r0,=$HandleLabel;//load the address of HandleXXX to r0
	ldr     r0,[r0]         ;//load the contents(service routine start address) of HandleXXX
	str     r0,[sp,#4]      ;//store the contents(ISR) of HandleXXX to stack
	ldmfd   sp!,{r0,pc}     ;//POP the work register and pc(jump to ISR)
	MEND
	

	IMPORT  |Image$$RO$$Limit|  ;// End of ROM code (=start of ROM data)
	IMPORT  |Image$$RW$$Base|   ;// Base of RAM to initialise
	IMPORT  |Image$$ZI$$Base|   ;// Base and limit of area
	IMPORT  |Image$$ZI$$Limit|  ;// to zero initialise
	
	IMPORT  Main    			;// The main entry of mon program 
	
	AREA    Init,CODE,READONLY

	ENTRY 

	;//1)The code, which converts to Big-endian, should be in little endian code.
	;//2)The following little endian code will be compiled in Big-Endian mode. 
	;//  The code byte order should be changed as the memory bus width.
	;//3)The pseudo instruction,DCD can't be used here because the linker generates error.
	ASSERT	:DEF:ENDIAN_CHANGE
	[ ENDIAN_CHANGE
	    ASSERT  :DEF:ENTRY_BUS_WIDTH
	    [ ENTRY_BUS_WIDTH=32
		b	ChangeBigEndian	    ;DCD 0xea000007 
	    ]
	    
	    [ ENTRY_BUS_WIDTH=16
		andeq	r14,r7,r0,lsl #20   ;DCD 0x0007ea00
	    ]
	    
	    [ ENTRY_BUS_WIDTH=8
		streq	r0,[r0,-r10,ror #1] ;DCD 0x070000ea
            ]
	|
	    b	ResetHandler  
    	]
	b	HandlerUndef	;//handler for Undefined mode
	b	HandlerSWI		;//handler for SWI interrupt
	b	HandlerPabort	;//handler for PAbort
	b	HandlerDabort	;//handler for DAbort
	b	.				;//reserved
	b	HandlerIRQ		;//handler for IRQ interrupt 
	b	HandlerFIQ		;//handler for FIQ interrupt

;//@0x20
	b	EnterPWDN
ChangeBigEndian
;//@0x24
	[ ENTRY_BUS_WIDTH=32
	    DCD	0xee110f10	;0xee110f10 => mrc p15,0,r0,c1,c0,0
	    DCD	0xe3800080	;0xe3800080 => orr r0,r0,#0x80;      //Big-endian
	    DCD	0xee010f10	;0xee010f10 => mcr p15,0,r0,c1,c0,0
	]
	[ ENTRY_BUS_WIDTH=16
	    DCD 0x0f10ee11
	    DCD 0x0080e380	
	    DCD 0x0f10ee01	
	]
	[ ENTRY_BUS_WIDTH=8
	    DCD 0x100f11ee	
	    DCD 0x800080e3	
	    DCD 0x100f01ee	
    	]
	DCD 0xffffffff  ;//swinv 0xffffff is similar with NOP and run well in both endian mode. 
	DCD 0xffffffff
	DCD 0xffffffff
	DCD 0xffffffff
	DCD 0xffffffff
	b ResetHandler
	
;//Function for entering power down mode
;// 1. SDRAM should be in self-refresh mode.
;// 2. All interrupt should be maksked for SDRAM/DRAM self-refresh.
;// 3. LCD controller should be disabled for SDRAM/DRAM self-refresh.
;// 4. The I-cache may have to be turned on. 
;// 5. The location of the following code may have not to be changed.

;//void EnterPWDN(int CLKCON); 
EnterPWDN			
	mov r2,r0				;//r2=rCLKCON
	tst r0,#0x8				;//POWER_OFF mode?
	bne ENTER_POWER_OFF

ENTER_STOP	
	ldr r0,=REFRESH		
	ldr r3,[r0]				;//r3=rREFRESH	
	mov r1, r3
	orr r1, r1, #BIT_SELFREFRESH
	str r1, [r0]			;//Enable SDRAM self-refresh

	mov r1,#16	   			;//wait until self-refresh is issued. may not be needed.
0	subs r1,r1,#1
	bne %B0

	ldr r0,=CLKCON			;//enter STOP mode.
	str r2,[r0]    

	mov r1,#32
0	subs r1,r1,#1			;//1) wait until the STOP mode is in effect.
	bne %B0					;//2) Or wait here until the CPU&Peripherals will be turned-off
							;//   Entering POWER_OFF mode, only the reset by wake-up is available.

	ldr r0,=REFRESH 		;//exit from SDRAM self refresh mode.
	str r3,[r0]
	
	MOV_PC_LR

ENTER_POWER_OFF	
	;//NOTE.
	;//1) rGSTATUS3 should have the return address after wake-up from POWER_OFF mode.
	
	ldr r0,=REFRESH		
	ldr r1,[r0]				;//r1=rREFRESH	
	orr r1, r1, #BIT_SELFREFRESH
	str r1, [r0]			;//Enable SDRAM self-refresh

	mov r1,#16	   			;//Wait until self-refresh is issued,which may not be needed.
0	subs r1,r1,#1
	bne %B0

	ldr 	r1,=MISCCR
	ldr	r0,[r1]
	orr	r0,r0,#(7<<17)  	;//Make sure that SCLK0:SCLK->0, SCLK1:SCLK->0, SCKE=L during boot-up 
	str	r0,[r1]

	ldr r0,=CLKCON
	str r2,[r0]    

	b .						;//CPU will die here.
	

WAKEUP_POWER_OFF
	;//Release SCLKn after wake-up from the POWER_OFF mode.
	ldr 	r1,=MISCCR
	ldr	r0,[r1]
	bic	r0,r0,#(7<<17)  	;//SCLK0:0->SCLK, SCLK1:0->SCLK, SCKE:L->H
	str	r0,[r1]
	
							;//Set memory control registers
    ldr	r0,=SMRDATA
	ldr	r1,=BWSCON			;//BWSCON Address
	add	r2, r0, #52			;//End address of SMRDATA
0       
	ldr	r3, [r0], #4    
	str	r3, [r1], #4    
	cmp	r2, r0		
	bne	%B0

	mov r1,#256
0	subs r1,r1,#1			;//1) wait until the SelfRefresh is released.
	bne %B0	

	ldr r1,=GSTATUS3 		;//GSTATUS3 has the start address just after POWER_OFF wake-up
	ldr r0,[r1]
	mov pc,r0
	LTORG
	   
HandlerFIQ      HANDLER HandleFIQ
HandlerIRQ      HANDLER HandleIRQ
HandlerUndef    HANDLER HandleUndef
HandlerSWI      HANDLER HandleSWI
HandlerDabort   HANDLER HandleDabort
HandlerPabort   HANDLER HandlePabort

IsrIRQ  
	sub	sp,sp,#4       		;//reserved for PC
	stmfd	sp!,{r8-r9}   
	
	ldr	r9,=INTOFFSET
	ldr	r9,[r9]
	ldr	r8,=HandleEINT0
	add	r8,r8,r9,lsl #2
	ldr	r8,[r8]
	str	r8,[sp,#8]
	ldmfd	sp!,{r8-r9,pc}

;//================================================================================================
;// ENTRY  
;//=================================================================================================
ResetHandler
	ldr	r0,=WTCON       	;//watch dog disable 
	ldr	r1,=0x0         
	str	r1,[r0]

	ldr	r0,=INTMSK
	ldr	r1,=0xffffffff  	;//all interrupt disable
	str	r1,[r0]

	ldr	r0,=INTSUBMSK
	ldr	r1,=0x7ff			;//all sub interrupt disable, 2002/04/10
	str	r1,[r0]

	[ {FALSE}
        					;// rGPFDAT = (rGPFDAT & ~(0xf<<4)) | ((~data & 0xf)<<4);    
        					;// Led_Display
	ldr	r0,=GPFCON
	ldr	r1,=0x5500		
	str	r1,[r0]
	ldr	r0,=GPFDAT
	ldr	r1,=0x10
	str	r1,[r0]
	]

	;//To reduce PLL lock time, adjust the LOCKTIME register. 
	ldr	r0,=LOCKTIME
	ldr	r1,=0xffffff
	str	r1,[r0]
        
    	[ PLL_ON_START
	;//Configure MPLL
	ldr	r0,=MPLLCON          
	ldr	r1,=((M_MDIV<<12)+(M_PDIV<<4)+M_SDIV)  ;//Fin=12MHz,Fout=50MHz
	str	r1,[r0]
	]

	;//Check if the boot is caused by the wake-up from POWER_OFF mode.
	ldr	r1,=GSTATUS2
	ldr	r0,[r1]
	tst	r0,#0x2
        ;//In case of the wake-up from POWER_OFF mode, go to POWER_OFF_WAKEUP handler. 
	bne	WAKEUP_POWER_OFF

	EXPORT StartPointAfterPowerOffWakeUp
StartPointAfterPowerOffWakeUp

	;//Set memory control registers
   	ldr	r0,=SMRDATA
	ldr	r1,=BWSCON					;//BWSCON Address
	add	r2, r0, #52					;//End address of SMRDATA
0       
	ldr	r3, [r0], #4    
	str	r3, [r1], #4    
	cmp	r2, r0		
	bne	%B0
	
    								;//Initialize stacks
	bl	InitStacks
	
  	;// Setup IRQ handler
	ldr	r0,=HandleIRQ       		;//This routine is needed
	ldr	r1,=IsrIRQ          		;//if there isn't 'subs pc,lr,#4' at 0x18, 0x1c
	str	r1,[r0]

									;//Copy and paste RW data/zero initialized data
	ldr	r0, =|Image$$RO$$Limit| 	; //Get pointer to ROM data
	ldr	r1, =|Image$$RW$$Base|  	; //and RAM copy
	ldr	r3, =|Image$$ZI$$Base|  
	
									;//Zero init base => top of initialised data
	cmp	r0, r1      				;// Check that they are different
	beq	%F2
1       
	cmp	r1, r3      				;// Copy init data
	ldrcc	r2, [r0], #4    		;//--> LDRCC r2, [r0] + ADD r0, r0, #4         
	strcc	r2, [r1], #4    		;//--> STRCC r2, [r1] + ADD r1, r1, #4
	bcc	%B1
2       
	ldr	r1, =|Image$$ZI$$Limit| 	;// Top of zero init segment
	mov	r2, #0
3       
	cmp	r3, r1      ; Zero init
	strcc	r2, [r3], #4
	bcc	%B3

	

    [ :LNOT:THUMBCODE
    	bl	Main        			;//Don't use main() because ......
    	b	.                       
    ]

    [ THUMBCODE         			;//for start-up code for Thumb mode
    	orr	lr,pc,#1
    	bx	lr
    	CODE16
    	bl	Main        			;//Don't use main() because ......
    	b	.
    	CODE32
    ]


;//function initializing stacks
InitStacks
									;//Don't use DRAM,such as stmfd,ldmfd......
									;//SVCstack is initialized before
									;//Under toolkit ver 2.5, 'msr cpsr,r1' can be used instead of 'msr cpsr_cxsf,r1'
	mrs	r0,cpsr
	bic	r0,r0,#MODEMASK
	orr	r1,r0,#UNDEFMODE|NOINT
	msr	cpsr_cxsf,r1				;//UndefMode
	ldr	sp,=UndefStack
	
	orr	r1,r0,#ABORTMODE|NOINT
	msr	cpsr_cxsf,r1				;//AbortMode
	ldr	sp,=AbortStack

	orr	r1,r0,#IRQMODE|NOINT
	msr	cpsr_cxsf,r1				;//IRQMode
	ldr	sp,=IRQStack
    
	orr	r1,r0,#FIQMODE|NOINT
	msr	cpsr_cxsf,r1				;//FIQMode
	ldr	sp,=FIQStack

	bic	r0,r0,#MODEMASK|NOINT
	orr	r1,r0,#SVCMODE
	
	msr	cpsr_cxsf,r1				;//SVCMode
	ldr	sp,=SVCStack
									;//USER mode has not be initialized.
	
	mov	pc,lr 
									;//The LR register won't be valid if the current mode is not SVC mode.
	LTORG

SMRDATA DATA
;// Memory configuration should be optimized for best performance 
;// The following parameter is not optimized.                     
;// Memory access cycle parameter strategy
;// 1) The memory settings is  safe parameters even at HCLK=75Mhz.
;// 2) SDRAM refresh period is for HCLK=75Mhz. 

        DCD (0+(B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28))
    	DCD ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC))   ;GCS0
    	DCD ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC))   ;GCS1 
    	DCD ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC))   ;GCS2
    	DCD ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC))   ;GCS3
    	DCD ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC))   ;GCS4
    	DCD ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC))   ;GCS5
    	DCD ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN))    ;GCS6
    	DCD ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN))    ;GCS7
    	DCD ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT)    



	DCD 0x32            ;SCLK power saving mode, BANKSIZE 128M/128M

    	DCD 0x30            ;MRSR6 CL=3clk
    	DCD 0x30            ;MRSR7
; //   	DCD 0x20            ;MRSR6 CL=2clk
; //   	DCD 0x20            ;MRSR7

    	ALIGN

    	AREA RamData, DATA, READWRITE

        ^   _ISR_STARTADDRESS
HandleReset 	#   4
HandleUndef 	#   4
HandleSWI   	#   4
HandlePabort    #   4
HandleDabort    #   4
HandleReserved  #   4
HandleIRQ   	#   4
HandleFIQ   	#   4

;//Don't use the label 'IntVectorTable',
;//The value of IntVectorTable is different with the address you think it may be.
;//IntVectorTable
HandleEINT0   	#   4
HandleEINT1   	#   4
HandleEINT2   	#   4
HandleEINT3   	#   4
HandleEINT4_7	#   4
HandleEINT8_23	#   4
HandleRSV6		#   4
HandleBATFLT   	#   4
HandleTICK   	#   4
HandleWDT		#   4
HandleTIMER0 	#   4
HandleTIMER1 	#   4
HandleTIMER2 	#   4
HandleTIMER3 	#   4
HandleTIMER4 	#   4
HandleUART2  	#   4
HandleLCD 		#   4
HandleDMA0		#   4
HandleDMA1		#   4
HandleDMA2		#   4
HandleDMA3		#   4
HandleMMC		#   4
HandleSPI0		#   4
HandleUART1		#   4
HandleRSV24		#   4
HandleUSBD		#   4
HandleUSBH		#   4
HandleIIC   	#   4
HandleUART0 	#   4
HandleSPI1 		#   4
HandleRTC 		#   4
HandleADC 		#   4

        END