涉及6个文件
head.S,init.c,main.c,makefile,nand.c,out.lds
head.S
.text
.global _start
_start:
b Reset
HandleUndef:
b HandleUndef
HandleSWI:
b HandleSWI
HandlePrefetchAbort:
b HandlePrefetchAbort
HandleDataAbort:
b HandleDataAbort
HandleNotUsed:
b HandleNotUsed
b HandleIRQ
HandleFIQ:
b HandleFIQ
Reset:
ldr r0, =0x53000000
mov r1, #0x0
str r1, [r0] @disable watchdog
msr cpsr_c, #0xd2 @IRQ mode,ARM mode,IRQ disable
ldr sp, =3072
msr cpsr_c, #0xd3 @Supervisor mode,ARM mode,IRQ disable
ldr sp, =1024*4 @set up stack,4K
msr cpsr_c, #0x53 @Supervisor mode,ARM mode,IRQ enable
ldr sp, =4096
bl clock_init
bl memsetup
bl nand_init
ldr r0, =0x30000000 @target address(sdram),nand_read 1parameter
mov r1, #4096 @start address,nand_read 2parameter
mov r2, #2048*2 @size copy to sdram,nand_read 3parameter
bl nand_read
bl create_page_table
bl mmu_init
ldr sp, =0xB4000000 @pstack go to sdram
ldr lr, =halt_loop
ldr pc, =main
halt_loop:
b halt_loop
HandleIRQ:
sub lr, lr, #4
stmdb sp!, {r0-r12,lr}
ldr lr, =int_return
ldr pc, =TIMER_Handle
int_return:
ldmia sp!, { r0-r12,pc }^
init.c
#define BWSCON (*(volatile unsigned long *)0x48000000)
#define BANKCON0 (*(volatile unsigned long *)0x48000004)
#define BANKCON1 (*(volatile unsigned long *)0x48000008)
#define BANKCON2 (*(volatile unsigned long *)0x4800000C)
#define BANKCON3 (*(volatile unsigned long *)0x48000010)
#define BANKCON4 (*(volatile unsigned long *)0x48000014)
#define BANKCON5 (*(volatile unsigned long *)0x48000018)
#define BANKCON6 (*(volatile unsigned long *)0x4800001C)
#define BANKCON7 (*(volatile unsigned long *)0x48000020)
#define REFRESH (*(volatile unsigned long *)0x48000024)
#define BANKSIZE (*(volatile unsigned long *)0x48000028)
#define MRSRB6 (*(volatile unsigned long *)0x4800002C)
#define MRSRB7 (*(volatile unsigned long *)0x48000030)
#define CLKDIVN (*(volatile unsigned long *)0x4C000014)
#define MPLLCON (*(volatile unsigned long *)0x4C000004)
#define S3C2440_MPLL_400MHZ 0x5C011
void memsetup()
{
BWSCON=0x22011110;
BANKCON0=0x00000700;//sram
BANKCON1=0x00000700;//rom
BANKCON2=0x00000700;
BANKCON3=0x00000700;
BANKCON4=0x00000700;
BANKCON5=0x00000700;
BANKCON6=0x00018005;//sdram
BANKCON7=0x00018005;
REFRESH=0x008C04F4;
BANKSIZE=0x000000B1;
MRSRB6=0x00000030;
MRSRB7=0x00000030;
}
void clock_init()
{
CLKDIVN=0x05;
__asm__(
"mrc p15, 0, r1, c1, c0, 0\n"
"orr r1, r1, #0xc0000000\n"
"mcr p15, 0, r1, c1, c0, 0\n"
);
MPLLCON=S3C2440_MPLL_400MHZ;
}
void create_page_table(void)
{
#define MMU_FULL_ACCESS (3 << 10)
#define MMU_DOMAIN (0 << 5)
#define MMU_SPECIAL (1 << 4)
#define MMU_CACHEABLE (1 << 3)
#define MMU_BUFFERABLE (1 << 2)
#define MMU_SECTION (2)
#define MMU_SECDESC (MMU_FULL_ACCESS | MMU_DOMAIN | MMU_SPECIAL | MMU_SECTION)
#define MMU_SECDESC_WB (MMU_FULL_ACCESS | MMU_DOMAIN | MMU_SPECIAL | \
MMU_CACHEABLE | MMU_BUFFERABLE | MMU_SECTION)
#define MMU_SECTION_SIZE 0x00100000
unsigned long virtuladdr, physicaladdr;
unsigned long *mmu_tlb_base = (unsigned long *)0x30000000;
virtuladdr = 0;
physicaladdr = 0;
*(mmu_tlb_base + (virtuladdr >> 20)) = (physicaladdr & 0xFFF00000) | MMU_SECDESC_WB;//0~4096 the same
virtuladdr = 0x56000000;
physicaladdr = 0x56000000;
*(mmu_tlb_base + (virtuladdr >> 20)) = (physicaladdr & 0xFFF00000) | MMU_SECDESC;
virtuladdr = 0x4A000000;
physicaladdr = 0x4A000000;
*(mmu_tlb_base + (virtuladdr >> 20)) = (physicaladdr & 0xFFF00000) | MMU_SECDESC;
virtuladdr = 0x51000000;
physicaladdr = 0x51000000;
*(mmu_tlb_base + (virtuladdr >> 20)) = (physicaladdr & 0xFFF00000) | MMU_SECDESC;
/*SDRAM to 0xB0000000~0xB4000000*/
virtuladdr = 0xB0000000;
physicaladdr = 0x30000000;
while (virtuladdr < 0xB4000000)
{
*(mmu_tlb_base + (virtuladdr >> 20)) = (physicaladdr & 0xFFF00000) | MMU_SECDESC_WB;
virtuladdr += 0x100000;
physicaladdr += 0x100000;
}
}
/*
* 启动MMU
*/
void mmu_init(void)
{
unsigned long ttb = 0x30000000;
__asm__(
"mov r0, #0\n"
"mcr p15, 0, r0, c7, c7, 0\n"
"mcr p15, 0, r0, c7, c10, 4\n"
"mcr p15, 0, r0, c8, c7, 0\n"
"mov r4, %0\n"
"mcr p15, 0, r4, c2, c0, 0\n"
"mvn r0, #0\n"
"mcr p15, 0, r0, c3, c0, 0\n"
"mrc p15, 0, r0, c1, c0, 0\n"
"bic r0, r0, #0x3000\n"
"bic r0, r0, #0x0300\n"
"bic r0, r0, #0x0087\n"
"orr r0, r0, #0x0002\n"
"orr r0, r0, #0x0004\n"
"orr r0, r0, #0x1000\n"
"orr r0, r0, #0x0001\n"
"mcr p15, 0, r0, c1, c0, 0\n"
:
: "r" (ttb) );
}
main.c
/*
led1 f4,led2 f5,led3 f6,int0 f0
*/
#define GPFCON (*(volatile unsigned long *)0x56000050)
#define GPFDAT (*(volatile unsigned long *)0x56000054)
#define GPF4_OUT (1<<(4*2))
#define GPF5_OUT (1<<(5*2))
#define GPF6_OUT (1<<(6*2))
#define GPF4_CON_MSK (3<<(4*2))
#define GPF5_CON_MSK (3<<(5*2))
#define GPF6_CON_MSK (3<<(6*2))
#define GPF4_DAT_MSK (1<<(4))
#define GPF5_DAT_MSK (1<<(5))
#define GPF6_DAT_MSK (1<<(6))
#define TIMER0_MSK (1<<(10))
#define TCFG0 (*(volatile unsigned long *)0x51000000)
#define TCON (*(volatile unsigned long *)0x51000008)
#define TCNTB0 (*(volatile unsigned long *)0x5100000C)
#define INTOFFSET (*(volatile unsigned long *)0x4A000014)
#define SRCPND (*(volatile unsigned long *)0X4A000000)
#define INTMSK (*(volatile unsigned long *)0X4A000008)
#define PRIORITY (*(volatile unsigned long *)0x4A00000C)
#define INTPND (*(volatile unsigned long *)0X4A000010)
void init_timer0()
{
SRCPND=0x0;
INTMSK=~TIMER0_MSK;
TCFG0=0xff;
TCNTB0=0xffff;
TCON=0xa;
TCON=0x9;
}
void led_set_out()
{
GPFCON&=~(GPF4_CON_MSK|GPF5_CON_MSK|GPF6_CON_MSK);
GPFCON|=GPF4_OUT|GPF5_OUT|GPF6_OUT;
GPFDAT&=~(GPF4_DAT_MSK);
GPFDAT&=~(GPF5_DAT_MSK);
GPFDAT&=~(GPF6_DAT_MSK);
GPFDAT|=(1<<4);
GPFDAT|=(1<<5);
GPFDAT|=(1<<6);
}
void led_reset(int ledn)
{
if(ledn==1)
{
GPFDAT|=(1<<4);
}
else if(ledn==2)
{
GPFDAT|=(1<<5);
}
else
{
GPFDAT|=(1<<6);
}
}
void led_set(int ledn)
{
if(ledn==1)
{
GPFDAT&=~(GPF4_DAT_MSK);
}
else if(ledn==2)
{
GPFDAT&=~(GPF5_DAT_MSK);
}
else
{
GPFDAT&=~(GPF6_DAT_MSK);
}
}
void TIMER_Handle()
{
int i;
led_set(1);
for(i=0;i<1000000;i++);
led_reset(1);
SRCPND=1<<INTOFFSET;
INTPND=1<<INTOFFSET;
}
int main()
{
int i;
led_set_out();
init_timer0();
while(1)
{
led_reset(2);
for(i=0;i<10000000;i++);
led_set(2);
for(i=0;i<10000000;i++);
}
return 0;
}
makefile
out.bin : head.S main.c nand.c init.c
arm-linux-gcc -c -o head.o head.S
arm-linux-gcc -c -o main.o main.c
arm-linux-gcc -c -o nand.o nand.c
arm-linux-gcc -c -o init.o init.c
arm-linux-ld -Tout.lds head.o main.o nand.o init.o -o out_elf
arm-linux-objcopy -O binary -S out_elf out.bin
arm-linux-objdump -D -m arm out_elf > out.dis
#rm -f out.dis out_elf *.o
clean:
rm -f out.dis out.bin out_elf *.o
nand.c
#define LARGER_NAND_PAGE
#define GSTATUS1 (*(volatile unsigned int *)0x560000B0)
#define BUSY 1
#define NAND_SECTOR_SIZE 512
#define NAND_BLOCK_MASK (NAND_SECTOR_SIZE - 1)
#define NAND_SECTOR_SIZE_LP 2048
#define NAND_BLOCK_MASK_LP (NAND_SECTOR_SIZE_LP - 1)
typedef unsigned int S3C24X0_REG32;
/* NAND FLASH (see S3C2410 manual chapter 6) */
typedef struct {
S3C24X0_REG32 NFCONF;
S3C24X0_REG32 NFCMD;
S3C24X0_REG32 NFADDR;
S3C24X0_REG32 NFDATA;
S3C24X0_REG32 NFSTAT;
S3C24X0_REG32 NFECC;
} S3C2410_NAND;
/* NAND FLASH (see S3C2440 manual chapter 6, www.100ask.net) */
typedef struct {
S3C24X0_REG32 NFCONF;
S3C24X0_REG32 NFCONT;
S3C24X0_REG32 NFCMD;
S3C24X0_REG32 NFADDR;
S3C24X0_REG32 NFDATA;
S3C24X0_REG32 NFMECCD0;
S3C24X0_REG32 NFMECCD1;
S3C24X0_REG32 NFSECCD;
S3C24X0_REG32 NFSTAT;
S3C24X0_REG32 NFESTAT0;
S3C24X0_REG32 NFESTAT1;
S3C24X0_REG32 NFMECC0;
S3C24X0_REG32 NFMECC1;
S3C24X0_REG32 NFSECC;
S3C24X0_REG32 NFSBLK;
S3C24X0_REG32 NFEBLK;
} S3C2440_NAND;
typedef struct {
void (*nand_reset)(void);
void (*wait_idle)(void);
void (*nand_select_chip)(void);
void (*nand_deselect_chip)(void);
void (*write_cmd)(int cmd);
void (*write_addr)(unsigned int addr);
unsigned char (*read_data)(void);
}t_nand_chip;
static S3C2410_NAND * s3c2410nand = (S3C2410_NAND *)0x4e000000;
static S3C2440_NAND * s3c2440nand = (S3C2440_NAND *)0x4e000000;
static t_nand_chip nand_chip;
/* 供外部调用的函数 */
void nand_init(void);
void nand_read(unsigned char *buf, unsigned long start_addr, int size);
/* NAND Flash操作的总入口, 它们将调用S3C2410或S3C2440的相应函数 */
static void nand_reset(void);
static void wait_idle(void);
static void nand_select_chip(void);
static void nand_deselect_chip(void);
static void write_cmd(int cmd);
static void write_addr(unsigned int addr);
static unsigned char read_data(void);
/* S3C2410的NAND Flash处理函数 */
static void s3c2410_nand_reset(void);
static void s3c2410_wait_idle(void);
static void s3c2410_nand_select_chip(void);
static void s3c2410_nand_deselect_chip(void);
static void s3c2410_write_cmd(int cmd);
static void s3c2410_write_addr(unsigned int addr);
static unsigned char s3c2410_read_data();
/* S3C2440的NAND Flash处理函数 */
static void s3c2440_nand_reset(void);
static void s3c2440_wait_idle(void);
static void s3c2440_nand_select_chip(void);
static void s3c2440_nand_deselect_chip(void);
static void s3c2440_write_cmd(int cmd);
static void s3c2440_write_addr(unsigned int addr);
static unsigned char s3c2440_read_data(void);
/* S3C2410的NAND Flash操作函数 */
/* 复位 */
static void s3c2410_nand_reset(void)
{
s3c2410_nand_select_chip();
s3c2410_write_cmd(0xff); // 复位命令
s3c2410_wait_idle();
s3c2410_nand_deselect_chip();
}
/* 等待NAND Flash就绪 */
static void s3c2410_wait_idle(void)
{
int i;
volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFSTAT;
while(!(*p & BUSY))
for(i=0; i<10; i++);
}
/* 发出片选信号 */
static void s3c2410_nand_select_chip(void)
{
int i;
s3c2410nand->NFCONF &= ~(1<<11);
for(i=0; i<10; i++);
}
/* 取消片选信号 */
static void s3c2410_nand_deselect_chip(void)
{
s3c2410nand->NFCONF |= (1<<11);
}
/* 发出命令 */
static void s3c2410_write_cmd(int cmd)
{
volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFCMD;
*p = cmd;
}
/* 发出地址 */
static void s3c2410_write_addr(unsigned int addr)
{
int i;
volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFADDR;
*p = addr & 0xff;
for(i=0; i<10; i++);
*p = (addr >> 9) & 0xff;
for(i=0; i<10; i++);
*p = (addr >> 17) & 0xff;
for(i=0; i<10; i++);
*p = (addr >> 25) & 0xff;
for(i=0; i<10; i++);
}
/* 读取数据 */
static unsigned char s3c2410_read_data(void)
{
volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFDATA;
return *p;
}
/* S3C2440的NAND Flash操作函数 */
/* 复位 */
static void s3c2440_nand_reset(void)
{
s3c2440_nand_select_chip();
s3c2440_write_cmd(0xff); // 复位命令
s3c2440_wait_idle();
s3c2440_nand_deselect_chip();
}
/* 等待NAND Flash就绪 */
static void s3c2440_wait_idle(void)
{
int i;
volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFSTAT;
while(!(*p & BUSY))
for(i=0; i<10; i++);
}
/* 发出片选信号 */
static void s3c2440_nand_select_chip(void)
{
int i;
s3c2440nand->NFCONT &= ~(1<<1);
for(i=0; i<10; i++);
}
/* 取消片选信号 */
static void s3c2440_nand_deselect_chip(void)
{
s3c2440nand->NFCONT |= (1<<1);
}
/* 发出命令 */
static void s3c2440_write_cmd(int cmd)
{
volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFCMD;
*p = cmd;
}
/* 发出地址 */
static void s3c2440_write_addr(unsigned int addr)
{
int i;
volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFADDR;
*p = addr & 0xff;
for(i=0; i<10; i++);
*p = (addr >> 9) & 0xff;
for(i=0; i<10; i++);
*p = (addr >> 17) & 0xff;
for(i=0; i<10; i++);
*p = (addr >> 25) & 0xff;
for(i=0; i<10; i++);
}
static void s3c2440_write_addr_lp(unsigned int addr)
{
int i;
volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFADDR;
int col, page;
col = addr & NAND_BLOCK_MASK_LP;
page = addr / NAND_SECTOR_SIZE_LP;
*p = col & 0xff; /* Column Address A0~A7 */
for(i=0; i<10; i++);
*p = (col >> 8) & 0x0f; /* Column Address A8~A11 */
for(i=0; i<10; i++);
*p = page & 0xff; /* Row Address A12~A19 */
for(i=0; i<10; i++);
*p = (page >> 8) & 0xff; /* Row Address A20~A27 */
for(i=0; i<10; i++);
*p = (page >> 16) & 0x03; /* Row Address A28~A29 */
for(i=0; i<10; i++);
}
/* 读取数据 */
static unsigned char s3c2440_read_data(void)
{
volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFDATA;
return *p;
}
/* 在第一次使用NAND Flash前,复位一下NAND Flash */
static void nand_reset(void)
{
nand_chip.nand_reset();
}
static void wait_idle(void)
{
nand_chip.wait_idle();
}
static void nand_select_chip(void)
{
int i;
nand_chip.nand_select_chip();
for(i=0; i<10; i++);
}
static void nand_deselect_chip(void)
{
nand_chip.nand_deselect_chip();
}
static void write_cmd(int cmd)
{
nand_chip.write_cmd(cmd);
}
static void write_addr(unsigned int addr)
{
nand_chip.write_addr(addr);
}
static unsigned char read_data(void)
{
return nand_chip.read_data();
}
/* 初始化NAND Flash */
void nand_init(void)
{
#define TACLS 0
#define TWRPH0 3
#define TWRPH1 0
/* 判断是S3C2410还是S3C2440 */
if ((GSTATUS1 == 0x32410000) || (GSTATUS1 == 0x32410002))
{
nand_chip.nand_reset = s3c2410_nand_reset;
nand_chip.wait_idle = s3c2410_wait_idle;
nand_chip.nand_select_chip = s3c2410_nand_select_chip;
nand_chip.nand_deselect_chip = s3c2410_nand_deselect_chip;
nand_chip.write_cmd = s3c2410_write_cmd;
nand_chip.write_addr = s3c2410_write_addr;
nand_chip.read_data = s3c2410_read_data;
/* 使能NAND Flash控制器, 初始化ECC, 禁止片选, 设置时序 */
s3c2410nand->NFCONF = (1<<15)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0);
}
else
{
nand_chip.nand_reset = s3c2440_nand_reset;
nand_chip.wait_idle = s3c2440_wait_idle;
nand_chip.nand_select_chip = s3c2440_nand_select_chip;
nand_chip.nand_deselect_chip = s3c2440_nand_deselect_chip;
nand_chip.write_cmd = s3c2440_write_cmd;
#ifdef LARGER_NAND_PAGE
nand_chip.write_addr = s3c2440_write_addr_lp;
#else
nand_chip.write_addr = s3c2440_write_addr;
#endif
nand_chip.read_data = s3c2440_read_data;
/* 设置时序 */
s3c2440nand->NFCONF = (TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4);
/* 使能NAND Flash控制器, 初始化ECC, 禁止片选 */
s3c2440nand->NFCONT = (1<<4)|(1<<1)|(1<<0);
}
/* 复位NAND Flash */
nand_reset();
}
/* 读函数 */
void nand_read(unsigned char *buf, unsigned long start_addr, int size)
{
int i, j;
#ifdef LARGER_NAND_PAGE
if ((start_addr & NAND_BLOCK_MASK_LP) || (size & NAND_BLOCK_MASK_LP)) {
return ; /* 地址或长度不对齐 */
}
#else
if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) {
return ; /* 地址或长度不对齐 */
}
#endif
/* 选中芯片 */
nand_select_chip();
for(i=start_addr; i < (start_addr + size);) {
/* 发出READ0命令 */
write_cmd(0);
/* Write Address */
write_addr(i);
#ifdef LARGER_NAND_PAGE
write_cmd(0x30);
#endif
wait_idle();
#ifdef LARGER_NAND_PAGE
for(j=0; j < NAND_SECTOR_SIZE_LP; j++, i++) {
#else
for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {
#endif
*buf = read_data();
buf++;
}
}
/* 取消片选信号 */
nand_deselect_chip();
return ;
}
out.lds
SECTIONS {
firtst 0x00000000 : { head.o nand.o init.o}
second 0xB0000000 : AT(4096) { main.o }
}