From e9e205a29c1ca7d4ccdfb1cdb35f1e25fb48b2c5 Mon Sep 17 00:00:00 2001 From: "gary.li.wenchao.4" Date: Tue, 16 Mar 2010 13:42:05 +0000 Subject: [PATCH] modified start_gcc.s, and added lowlevel_init.S to initialize sdram. git-svn-id: https://rt-thread.googlecode.com/svn/trunk@493 bbd45198-f89e-11dd-88c7-29a3b14d5316 --- libcpu/arm/s3c24x0/lowlevel_init.S | 137 ++++++++++++++++ libcpu/arm/s3c24x0/start_gcc.s | 253 ++++++++++++++++++----------- 2 files changed, 297 insertions(+), 93 deletions(-) create mode 100644 libcpu/arm/s3c24x0/lowlevel_init.S diff --git a/libcpu/arm/s3c24x0/lowlevel_init.S b/libcpu/arm/s3c24x0/lowlevel_init.S new file mode 100644 index 000000000..c7d5fd38b --- /dev/null +++ b/libcpu/arm/s3c24x0/lowlevel_init.S @@ -0,0 +1,137 @@ +/* + * File : application.c + * This file is part of RT-Thread RTOS + * COPYRIGHT (C) 2006, RT-Thread Development Team + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rt-thread.org/license/LICENSE + * + * Change Logs: + * Date Author Notes + * 2010-03-16 Gary Lee the first version + */ + +#define BWSCON 0x48000000 + +/* BWSCON */ +#define DW8 (0x0) +#define DW16 (0x1) +#define DW32 (0x2) +#define WAIT (0x1<<2) +#define UBLB (0x1<<3) + +#define B1_BWSCON (DW16) +#define B2_BWSCON (DW16) +#define B3_BWSCON (DW16 + WAIT + UBLB) +#define B4_BWSCON (DW16) +#define B5_BWSCON (DW16) +#define B6_BWSCON (DW32) +#define B7_BWSCON (DW32) + +#define B0_Tacs 0x0 +#define B0_Tcos 0x0 +#define B0_Tacc 0x7 +#define B0_Tcoh 0x0 +#define B0_Tah 0x0 +#define B0_Tacp 0x0 +#define B0_PMC 0x0 + +#define B1_Tacs 0x0 +#define B1_Tcos 0x0 +#define B1_Tacc 0x7 +#define B1_Tcoh 0x0 +#define B1_Tah 0x0 +#define B1_Tacp 0x0 +#define B1_PMC 0x0 + +#define B2_Tacs 0x0 +#define B2_Tcos 0x0 +#define B2_Tacc 0x7 +#define B2_Tcoh 0x0 +#define B2_Tah 0x0 +#define B2_Tacp 0x0 +#define B2_PMC 0x0 + +#define B3_Tacs 0xc +#define B3_Tcos 0x7 +#define B3_Tacc 0xf +#define B3_Tcoh 0x1 +#define B3_Tah 0x0 +#define B3_Tacp 0x0 +#define B3_PMC 0x0 + +#define B4_Tacs 0x0 +#define B4_Tcos 0x0 +#define B4_Tacc 0x7 +#define B4_Tcoh 0x0 +#define B4_Tah 0x0 +#define B4_Tacp 0x0 +#define B4_PMC 0x0 + +#define B5_Tacs 0xc +#define B5_Tcos 0x7 +#define B5_Tacc 0xf +#define B5_Tcoh 0x1 +#define B5_Tah 0x0 +#define B5_Tacp 0x0 +#define B5_PMC 0x0 + +#define B6_MT 0x3 /* SDRAM */ +#define B6_Trcd 0x1 +#define B6_SCAN 0x1 /* 9bit */ + +#define B7_MT 0x3 /* SDRAM */ +#define B7_Trcd 0x1 /* 3clk */ +#define B7_SCAN 0x1 /* 9bit */ + +/* REFRESH parameter */ +#define REFEN 0x1 /* Refresh enable */ +#define TREFMD 0x0 /* CBR(CAS before RAS)/Auto refresh */ +#define Trc 0x3 /* 7clk */ +#define Tchr 0x2 /* 3clk */ + +#define Trp 0x2 /* 4clk */ +#define REFCNT 1012 + +/**************************************/ + +.globl lowlevel_init +lowlevel_init: + /* memory control configuration */ + /* make r0 relative the current location so that it */ + /* reads SMRDATA out of FLASH rather than memory ! */ + ldr r0, =SMRDATA + ldr r1, =lowlevel_init + sub r0, r0, r1 + adr r3, lowlevel_init /* r3 <- current position of code */ + add r0, r0, r3 + ldr r1, =BWSCON /* Bus Width Status Controller */ + add r2, r0, #13*4 +0: + ldr r3, [r0], #4 + str r3, [r1], #4 + cmp r2, r0 + bne 0b + + /* everything is fine now */ + mov pc, lr + + .ltorg +/* the literal pools origin */ + +SMRDATA: + .word (0+(B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28)) + .word ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC)) + .word ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC)) + .word ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC)) + .word ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC)) + .word ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC)) + .word ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC)) + .word ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN)) + .word ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN)) + .word ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT) + .word 0xb2 + .word 0x30 + .word 0x30 + diff --git a/libcpu/arm/s3c24x0/start_gcc.s b/libcpu/arm/s3c24x0/start_gcc.s index 6db7a4895..a754c85f5 100644 --- a/libcpu/arm/s3c24x0/start_gcc.s +++ b/libcpu/arm/s3c24x0/start_gcc.s @@ -12,6 +12,7 @@ * 2006-03-13 Bernard first version * 2006-10-05 Alsor.Z for s3c2440 initialize * 2008-01-29 Yi.Qiu for QEMU emulator + * 2010-03-15 Gary Lee Modified the structure of startcode */ #define CONFIG_STACKSIZE 512 @@ -37,6 +38,10 @@ #define S_R1 4 #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 FIQMODE, 0x11 .equ IRQMODE, 0x12 @@ -88,14 +93,14 @@ .globl _start _start: - b reset - ldr pc, _vector_undef - ldr pc, _vector_swi - ldr pc, _vector_pabt - ldr pc, _vector_dabt - ldr pc, _vector_resv - ldr pc, _vector_irq - ldr pc, _vector_fiq + b reset + ldr pc, _vector_undef + ldr pc, _vector_swi + ldr pc, _vector_pabt + ldr pc, _vector_dabt + ldr pc, _vector_resv + ldr pc, _vector_irq + ldr pc, _vector_fiq _vector_undef: .word vector_undef _vector_swi: .word vector_swi @@ -105,7 +110,7 @@ _vector_resv: .word vector_resv _vector_irq: .word vector_irq _vector_fiq: .word vector_fiq -.balignl 16,0xdeadbeef +.balignl 16, 0xdeadbeef /* ************************************************************************* @@ -116,26 +121,21 @@ _vector_fiq: .word vector_fiq * jump to second stage * ************************************************************************* - */ - -_TEXT_BASE: + */ +_TEXT_BASE: /* TEXT_BASE was defined in rtconfig.py */ .word TEXT_BASE -/* - * rtthread kernel start and end - * which are defined in linker script - */ +/* rtthread kernel start and end which are defined in linker script */ .globl _rtthread_start _rtthread_start: .word _start - + +/* _end was defined in link script */ .globl _rtthread_end _rtthread_end: .word _end -/* - * rtthread bss start and end which are defined in linker script - */ +/* rtthread bss start and end which are defined in linker script */ .globl _bss_start _bss_start: .word __bss_start @@ -165,21 +165,73 @@ ABORT_STACK_START: _STACK_START: .word _svc_stack_start + 4096 -/* ----------------------------------entry------------------------------*/ +.globl _load_address +#if defined (__FLASH_BUILD__) +_load_address: + .word ROM_BASE + _TEXT_BASE +#else +_load_address: + .word RAM_BASE + _TEXT_BASE +#endif + +/* + ************************************************************************* + * Actual start (entry point) + ************************************************************************* + */ reset: + bl mode_svn32 + bl watchdog_disable + bl interrupt_disable + bl sys_clock_setup + bl cpu_crit_init + bl interrupt_vector_setup + bl stack_setup + bl bss_clear + /* call C++ constructors of global objects */ + ldr r0, =__ctors_start__ + ldr r1, =__ctors_end__ - /* set the cpu to SVC32 mode */ - mrs r0,cpsr - bic r0,r0,#MODEMASK - orr r0,r0,#SVCMODE - msr cpsr,r0 - - /* watch dog disable */ - ldr r0,=WTCON - ldr r1,=0x0 - str r1,[r0] +ctor_loop: + cmp r0, r1 + beq kernel_start + ldr r2, [r0], #4 + stmfd sp!, {r0-r1} + mov lr, pc + bx r2 + ldmfd sp!, {r0-r1} + b ctor_loop + +kernel_start: + /* start RT-Thread Kernel */ + ldr pc, _rtthread_startup + +_rtthread_startup: + .word rtthread_startup +/* + ************************************************************************* + * 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] @@ -187,8 +239,50 @@ reset: 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 */ - ldr r0, _load_address +interrupt_vector_setup: + ldr r0, _load_address /* _load_address = 0x30000000 */ mov r1, #0x0 /* target address */ add r2, r0, #0x20 /* size, 32bytes */ @@ -198,10 +292,39 @@ copy_loop: cmp r0, r2 /* until source end addreee [r2] */ ble copy_loop - /* setup stack */ - bl stack_setup + mov pc, lr + +stack_setup: + mrs r0, cpsr + bic r0, r0, #MODEMASK + orr r1, r0, #UNDEFMODE|NOINT + msr cpsr_cxsf, r1 /* undef mode */ + ldr sp, UNDEFINED_STACK_START - /* clear .bss */ + orr r1,r0,#ABORTMODE|NOINT + msr cpsr_cxsf,r1 /* abort mode */ + ldr sp, ABORT_STACK_START + + orr r1,r0,#IRQMODE|NOINT + msr cpsr_cxsf,r1 /* IRQ mode */ + ldr sp, IRQ_STACK_START + + orr r1,r0,#FIQMODE|NOINT + msr cpsr_cxsf,r1 /* FIQ mode */ + ldr sp, FIQ_STACK_START + + bic r0,r0,#MODEMASK + orr r1,r0,#SVCMODE|NOINT + msr cpsr_cxsf,r1 /* SVC mode */ + + ldr sp, _STACK_START + + /* USER mode is not initialized. */ + + 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 */ @@ -209,37 +332,10 @@ copy_loop: bss_loop: cmp r1,r2 /* check if data to clear */ strlo r0,[r1],#4 /* clear 4 bytes */ - blo bss_loop /* loop until done */ + blo bss_loop /* loop until done */ - /* call C++ constructors of global objects */ - ldr r0, =__ctors_start__ - ldr r1, =__ctors_end__ + mov pc, lr -ctor_loop: - cmp r0, r1 - beq ctor_end - ldr r2, [r0], #4 - stmfd sp!, {r0-r1} - mov lr, pc - bx r2 - ldmfd sp!, {r0-r1} - b ctor_loop - -ctor_end: - - /* start RT-Thread Kernel */ - ldr pc, _rtthread_startup - -_rtthread_startup: - .word rtthread_startup -#if defined (__FLASH_BUILD__) -_load_address: - .word ROM_BASE + _TEXT_BASE -#else -_load_address: - .word RAM_BASE + _TEXT_BASE -#endif - /* ************************************************************************* * @@ -358,33 +454,4 @@ _interrupt_thread_switch: ldmfd sp!, {r0-r12,lr,pc} /* pop new task's r0-r12,lr & pc */ -stack_setup: - mrs r0, cpsr - bic r0, r0, #MODEMASK - orr r1, r0, #UNDEFMODE|NOINT - msr cpsr_cxsf, r1 /* undef mode */ - ldr sp, UNDEFINED_STACK_START - - orr r1,r0,#ABORTMODE|NOINT - msr cpsr_cxsf,r1 /* abort mode */ - ldr sp, ABORT_STACK_START - - orr r1,r0,#IRQMODE|NOINT - msr cpsr_cxsf,r1 /* IRQ mode */ - ldr sp, IRQ_STACK_START - - orr r1,r0,#FIQMODE|NOINT - msr cpsr_cxsf,r1 /* FIQ mode */ - ldr sp, FIQ_STACK_START - - bic r0,r0,#MODEMASK - orr r1,r0,#SVCMODE|NOINT - msr cpsr_cxsf,r1 /* SVC mode */ - - ldr sp, _STACK_START - - /* USER mode is not initialized. */ - - mov pc,lr /* The LR register may be not valid for the mode changes.*/ - /*/*}*/