static s32 balong_i2c_status_check(struct balong_i2c_ctrl *i2c_master)
{
u32 reg_value;
s32 timeout=I2C_STATUS_TIMEOUT;
/*Does bus transfer over */
do
{
reg_value= readl(i2c_master->regs+HI_I2C_SR_OFFSET);
/*判断是否收到ACK中断*/
if(reg_value&HI_I2C_SR_ACKERR){
i2c_print_error("i2c hasn't receive ack!\n");
}
/*判断是否有总线仲裁失败的情况*/
if(reg_value&HI_I2C_SR_ABITR){
i2c_print_error("i2c has abitrage ERROR!\n");
}
}while((!(reg_value &HI_I2C_SR_INTDONE)) && (--timeout > 0));
if(0 == timeout)
{
i2c_print_error("I2C: Timeout! \n");
return I2C_ERROR;
}
balong_i2c_all_mask(i2c_master);
return OK;
}
static void balong_i2c_message_start(struct balong_i2c_ctrl *i2c_master,u8 device_id)
{
/*lint -save -e958*/
u32 addr=0;
u32 tmp=0;
/*lint -restore*/
if(NULL == i2c_master){
i2c_print_error("i2c master is null\n");
return ;
}
/*set high high level cycle*/
balong_i2c_scl_high(i2c_master);
/* set high low level cycle */
balong_i2c_scl_low(i2c_master);
/* clear all interrupt */
balong_i2c_all_mask(i2c_master);
/* set i2c ctrl*/
balong_i2c_enable(i2c_master);
/* set the first message ,and put it in the TXR register*/
addr=(device_id&SLAVE_ID_MASK)<<1;
writel(addr,i2c_master->regs+HI_I2C_TXR_OFFSET);
/* send start command and write command */
tmp=HI_I2C_COM_START|HI_I2C_COM_WRITE;
writel(tmp,i2c_master->regs+HI_I2C_COM_OFFSET);
return ;
}
/*****************************************************************************
fun_name : balong_i2c_status_check
function : get i2c bus transfer status
para_in : no
para_out : no
back_val :
0:success
-1:fail
modify log :
date : 2013-3-14
Modification : create file
*****************************************************************************/
s32 balong_i2c_status_check(struct balong_i2c_ctrl *i2c_master)
{
u32 reg_value;
s32 timeout=I2C_STATUS_TIMEOUT;
/*Does bus transfer over */
do
{
reg_value= readl(i2c_master->regs+HI_I2C_SR_OFFSET);
/*ÅжÏÊÇ·ñÊÕµ½ACKÖжÏ*/
if(reg_value&HI_I2C_SR_ACKERR){
cprintf("i2c hasn't receive ack!status_register is:0x%x\n",reg_value);
}
/*ÅжÏÊÇ·ñÓÐ×ÜÏßÖÙ²Ãʧ°ÜµÄÇé¿ö*/
if(reg_value&HI_I2C_SR_ABITR){
cprintf("i2c has abitrage ERROR!status_register is:0x%x\n",reg_value);
return I2C_ERROR;
}
}while((!(reg_value &HI_I2C_SR_INTDONE)) && (--timeout > 0));
if(0 == timeout)
{
cprintf("I2C: Timeout! \n");
return I2C_ERROR;
}
balong_i2c_all_mask(i2c_master);
return OK;
}
