I want to read the register value for check the USB connect/disconnect state in uboot,here is my codes but I found it can't work it
uboot,I think it was address error. Can you help me to check this codes and tell me how to find the register address in uboot, thanks.
int mx6sl_evk_charger_check(void)
{
u32 vbus;
int i=0;
#define CHARGER_ADDR 0xf40c8000
//#define CHARGER_ADDR 0x20C81D0
printf("%s %s %d \n",__FILE__,__func__,__LINE__);
/* Enable the vdd3p0 curret limiter */
writel(BM_ANADIG_REG_3P0_ENABLE_LINREG |
BM_ANADIG_REG_3P0_ENABLE_ILIMIT,
CHARGER_ADDR + HW_ANADIG_REG_3P0_SET);
/* check if vbus is valid */
if (!(readl(CHARGER_ADDR + HW_ANADIG_USB1_VBUS_DET_STAT) &
BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)) {
printf( "vbus is error\n");
vbus = 0;
return vbus;
}
/* Enable charger detector */
writel(BM_ANADIG_USB1_CHRG_DETECT_EN_B,
CHARGER_ADDR + HW_ANADIG_USB1_CHRG_DETECT_CLR);
/*
* - Do not check whether a charger is connected to the USB port
* - Check whether the USB plug has been in contact with each other
*/
writel(BM_ANADIG_USB1_CHRG_DETECT_CHK_CONTACT
| BM_ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B,
CHARGER_ADDR + HW_ANADIG_USB1_CHRG_DETECT_SET);
udelay(200000);
for (i = 0; i < 1000; i = i + 1) {
if( (readl(CHARGER_ADDR + HW_ANADIG_USB1_CHRG_DET_STAT) &
/*BM_ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED*/
BM_ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT)
||(readl(CHARGER_ADDR + HW_ANADIG_USB1_CHRG_DET_STAT) &
BM_ANADIG_USB1_CHRG_DET_STAT_DP_STATE)
){
printf( "Plug Contact = 1\n");
vbus =1;
break;
}else if(i > 800){
printf( "VBUS is coming from a dedicated power supply.\n");
vbus =0;
return vbus;
}else{
udelay(1000);
}
}
return vbus;
}
BTW,I had tested this codes in kernel,and it works well.
