📄 sysinit.s
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INCLUDE inc\option.inc
INCLUDE inc\memcfg.inc
;****************************************************************************
;存储器空间
;GCS6 64M 16bit(8MB) DRAM/SDRAM(0xc000000-0xc7fffff)
;APP RAM=0xc000000~0xc7effff
;44BMON RAM=0xc7f0000-0xc7fffff
;STACK =0xc7ffa00
;****************************************************************************
;中断控制预定义
INTPND EQU 0x01e00004
INTMOD EQU 0x01e00008
INTMSK EQU 0x01e0000c
I_ISPR EQU 0x01e00020
I_CMST EQU 0x01e0001c
I_ISPC EQU 0x01e00024
;****************************************************************************
;看门狗定时器预定义
WTCON EQU 0x01d30000
;****************************************************************************
;系统时钟预定义
PLLCON EQU 0x01d80000
CLKCON EQU 0x01d80004
LOCKTIME EQU 0x01d8000c
;****************************************************************************
;存储器控制预定义
REFRESH EQU 0x01c80024
;****************************************************************************
;BDMA目的寄存器
BDIDES0 EQU 0x1f80008
BDIDES1 EQU 0x1f80028
;****************************************************************************
;预定义常数（常量）
USERMODE EQU 0x10
FIQMODE EQU 0x11
IRQMODE EQU 0x12
SVCMODE EQU 0x13
ABORTMODE EQU 0x17
UNDEFMODE EQU 0x1b
MODEMASK EQU 0x1f
NOINT EQU 0xc0
;*****************************************************************
AREA InitSystemBlk, CODE, READONLY
;*****************************************************************
;初始化程序开始
EXPORT InitSystem
InitSystem
;禁止看门狗
ldr r0, =WTCON
ldr r1, =0
str r1,[r0]
;禁止所有中断
ldr r0,=INTMSK
ldr r1,=0x07ffffff
str r1,[r0]
;设定时钟控制寄存器
ldr r0, =LOCKTIME
ldr r1, =0xfff
str r1, [r0]
;[ PLLONSTART
ldr r0, =PLLCON ;锁相环倍频设定
ldr r1, =((M_DIV<<12)+(P_DIV<<4)+S_DIV) ;设定系统主时钟频率, 倍频为((P_DIV+2)*(2的S_DIV次方))/(M_DIV+8)
str r1, [r0]
;]
ldr r0, =CLKCON
ldr r1, =0x7ff8 ;所有功能单元块时钟使能
str r1, [r0]
;****************************************************************************
;为BDMA改变BDMACON的复位值
ldr r0, =BDIDES0
ldr r1, =0x40000000 ;BDIDESn reset value should be 0x40000000
str r1, [r0]
ldr r0, =BDIDES1
ldr r1, =0x40000000 ;BDIDESn reset value should be 0x40000000
str r1, [r0]
;****************************************************
;设定存储器控制寄存器
adr r0, InitSystem
ldr r1, =InitSystem
sub r0, r1, r0
ldr r1, =SMRDATA
sub r0, r1, r0
ldmia r0, {r1-r13}
ldr r0, =0x01c80000 ;BWSCON Address
stmia r0, {r1-r13}
;****************************************************
;初始化堆栈
;Don't use DRAM,such as stmfd,ldmfd......
;SVCstack is initialized before
;Under toolkit ver 2.50, '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
orr r1, r0, #SVCMODE|NOINT
msr cpsr_cxsf, r1 ;SVCMode
ldr sp, =SVCStack
;USER mode is not initialized.
;***********************************************
mov pc, lr ;返回
;*****************************************************************
SMRDATA DATA
;*****************************************************************
;存储器最好配置成最优的性能,下面的参数不是最优化的
;*****************************************************************
;*** memory access cycle parameter strategy ***
; 1) Even FP-DRAM, EDO setting has more late fetch point by half-clock
; 2) The memory settings,here, are made the safe parameters even at 66Mhz.
; 3) FP-DRAM Parameters:tRCD=3 for tRAC, tcas=2 for pad delay, tcp=2 for bus load.
; 4) DRAM refresh rate is for 40Mhz.
;bank0 16bit BOOT ROM
;bank1 8bit NandFlash
;bank2 16bit IDE
;bank3 8bit UDB
;bank4 rtl8019
;bank5 ext
;bank6 16bit SDRAM
;bank7 16bit SDRAM
[ BUSWIDTH=16
DCD 0x11110101 ;Bank0=16bit BootRom(AT29C010A*2) :0x0
| ;BUSWIDTH=32
DCD 0x22222220 ;Bank0=OM[1:0], Bank1~Bank7=32bit
]
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
[ BDRAMTYPE="DRAM"
DCD ((B6_MT<<15)+(B6_Trcd<<4)+(B6_Tcas<<3)+(B6_Tcp<<2)+(B6_CAN)) ;GCS6 check the MT value in parameter.a
DCD ((B7_MT<<15)+(B7_Trcd<<4)+(B7_Tcas<<3)+(B7_Tcp<<2)+(B7_CAN)) ;GCS7
| ;"SDRAM"
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) ;REFRESH RFEN=1, TREFMD=0, trp=3clk, trc=5clk, tchr=3clk,count=1019
DCD 0x10 ;SCLK power down mode, BANKSIZE 32M/32M
DCD 0x20 ;MRSR6 CL=2clk
DCD 0x20 ;MRSR7
ALIGN
;****************************************************
;本函数用来进入掉电模式
;****************************************************
;void EnterPWDN(int CLKCON);
EnterPWDN
mov r2,r0 ;r0=CLKCON
ldr r0,=REFRESH
ldr r3,[r0]
mov r1, r3
orr r1, r1, #0x400000 ;self-refresh enable
str r1, [r0]
nop ;Wait until self-refresh is issued. May not be needed.
nop ;If the other bus master holds the bus, ...
nop ; mov r0, r0
nop
nop
nop
nop
;enter POWERDN mode
ldr r0,=CLKCON
str r2,[r0]
;wait until enter SL_IDLE,STOP mode and until wake-up
ldr r0,=0x10
0 subs r0,r0,#1
bne %B0
;exit from DRAM/SDRAM self refresh mode.
ldr r0,=REFRESH
str r3,[r0]
mov pc,lr
;*******************************************************
;***********************************************
AREA RamData, DATA, READWRITE
^ (_ISR_STARTADDRESS-0x8000 )
UserStack # 2048 ;c1(c7)ffa00
SVCStack # 2048 ;c1(c7)ffb00
UndefStack # 0 ;c1(c7)ffc00
AbortStack # 0 ;c1(c7)ffd00
IRQStack # 4096 ;c1(c7)ffe00
FIQStack # 0 ;c1(c7)fff00
;****************************************************************************
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