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remove clk_init and sdram_init 

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@505 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
gary.li.wenchao.4 2010-03-18 02:48:12 +00:00
parent b0e70cbebb
commit 3c6a9775a2
1 changed files with 39 additions and 106 deletions
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145
libcpu/arm/s3c24x0/start_gcc.s
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@ -12,7 +12,6 @@
* 2006-03-13 Bernard first version * 2006-03-13 Bernard first version
* 2006-10-05 Alsor.Z for s3c2440 initialize * 2006-10-05 Alsor.Z for s3c2440 initialize
* 2008-01-29 Yi.Qiu for QEMU emulator * 2008-01-29 Yi.Qiu for QEMU emulator
* 2010-03-15 Gary Lee Modified the structure of startcode
*/ */
#define CONFIG_STACKSIZE 512 #define CONFIG_STACKSIZE 512
@ -38,10 +37,6 @@
#define S_R1 4 #define S_R1 4
#define S_R0 0 #define S_R0 0
#define CLK_CTL_BASE 0x4C000000 /* Gary Lee */
#define MDIV_405 0x7f << 12 /* Gary Lee */
#define PSDIV_405 0x21 /* Gary Lee */
.equ USERMODE, 0x10 .equ USERMODE, 0x10
.equ FIQMODE, 0x11 .equ FIQMODE, 0x11
.equ IRQMODE, 0x12 .equ IRQMODE, 0x12
@ -180,14 +175,46 @@ _load_address:
************************************************************************* *************************************************************************
*/ */
reset: reset:
bl mode_svn32 /* set the cpu to SVC32 mode */
bl watchdog_disable mrs r0, cpsr
bl interrupt_disable bic r0, r0,#MODEMASK
bl sys_clock_setup orr r0, r0,#SVCMODE
bl cpu_crit_init msr cpsr, r0
bl interrupt_vector_setup
/* watch dog disable */
ldr r0, =WTCON
ldr r1, =0x0
str r1, [r0]
/* mask all IRQs by clearing all bits in the INTMRs */
ldr r1, =INTMSK
ldr r0, =0xffffffff
str r0, [r1]
ldr r1, =INTSUBMSK
ldr r0, =0x7fff /*all sub interrupt disable */
str r0, [r1]
/* set interrupt vector */
ldr r0, _load_address /* _load_address = 0x30000000 */
mov r1, #0x0 /* target address */
add r2, r0, #0x20 /* size, 32bytes */
copy_loop:
ldmia r0!, {r3-r10} /* copy from source address [r0] */
stmia r1!, {r3-r10} /* copy to target address [r1] */
cmp r0, r2 /* until source end addreee [r2] */
ble copy_loop
bl stack_setup bl stack_setup
bl bss_clear /* clear .bss */
mov r0,#0 /* get a zero */
ldr r1,=__bss_start /* bss start */
ldr r2,=__bss_end /* bss end */
bss_loop:
cmp r1,r2 /* check if data to clear */
strlo r0,[r1],#4 /* clear 4 bytes */
blo bss_loop /* loop until done */
/* call C++ constructors of global objects */ /* call C++ constructors of global objects */
ldr r0, =__ctors_start__ ldr r0, =__ctors_start__
ldr r1, =__ctors_end__ ldr r1, =__ctors_end__
@ -213,87 +240,6 @@ _rtthread_startup:
* Subroutines * Subroutines
************************************************************************* *************************************************************************
*/ */
/* set the cpu to SVC32 mode */
mode_svn32:
mrs r0, cpsr
bic r0, r0,#MODEMASK
orr r0, r0,#SVCMODE
msr cpsr, r0
mov pc, lr
/* watch dog disable */
watchdog_disable:
ldr r0, =WTCON
ldr r1, =0x0
str r1, [r0]
mov pc, lr
/* mask all IRQs by clearing all bits in the INTMRs */
interrupt_disable:
ldr r1, =INTMSK
ldr r0, =0xffffffff
str r0, [r1]
ldr r1, =INTSUBMSK
ldr r0, =0x7fff /*all sub interrupt disable */
str r0, [r1]
mov pc, lr
sys_clock_setup: /* FCLK:HCLK:PCLK = 1:4:8 */
ldr r0, =CLKDIVN
mov r1, #5
str r1, [r0]
mrc p15, 0, r1, c1, c0, 0 /* switch to asynchronous mode */
orr r1, r1, #0xc0000000
mcr p15, 0, r1, c1, c0, 0
mov r1, #CLK_CTL_BASE
mov r2, #MDIV_405
add r2, r2, #PSDIV_405
str r2, [r1, #0x04] /* MPLLCON Gary Lee */
mov pc, lr
/*==============================================================================*/
cpu_crit_init:
/* flush v4 I/D caches */
mov r0, #0
mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
/* disable MMU stuff and caches */
mrc p15, 0, r0, c1, c0, 0
bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */
bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */
orr r0, r0, #0x00000002 /* set bit 2 (A) Align */
orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */
mcr p15, 0, r0, c1, c0, 0
mov ip, lr
bl lowlevel_init
mov lr, ip
mov pc, lr
/* set interrupt vector */
interrupt_vector_setup:
ldr r0, _load_address /* _load_address = 0x30000000 */
mov r1, #0x0 /* target address */
add r2, r0, #0x20 /* size, 32bytes */
copy_loop:
ldmia r0!, {r3-r10} /* copy from source address [r0] */
stmia r1!, {r3-r10} /* copy to target address [r1] */
cmp r0, r2 /* until source end addreee [r2] */
ble copy_loop
mov pc, lr
stack_setup: stack_setup:
mrs r0, cpsr mrs r0, cpsr
bic r0, r0, #MODEMASK bic r0, r0, #MODEMASK
@ -322,19 +268,6 @@ stack_setup:
/* USER mode is not initialized. */ /* USER mode is not initialized. */
mov pc,lr /* The LR register may be not valid for the mode changes.*/ mov pc,lr /* The LR register may be not valid for the mode changes.*/
/* clear .bss */
bss_clear:
mov r0,#0 /* get a zero */
ldr r1,=__bss_start /* bss start */
ldr r2,=__bss_end /* bss end */
bss_loop:
cmp r1,r2 /* check if data to clear */
strlo r0,[r1],#4 /* clear 4 bytes */
blo bss_loop /* loop until done */
mov pc, lr
/* /*
************************************************************************* *************************************************************************