/*****************************************************************************
函 数 名 : I2C_Enable
功能描述 :
输入参数 : void
输出参数 : 无
返 回 值 :
调用函数 :
被调函数 :
*****************************************************************************/
EFI_STATUS
EFIAPI
I2C_Enable(UINT32 Socket,UINT8 Port)
{
I2C0_ENABLE_U I2cEnableReg;
I2C0_ENABLE_STATUS_U I2cEnableStatusReg;
UINTN Base = PlatformGetI2cBase(Socket, Port);
//打开I2C
I2C_REG_READ(Base + I2C_ENABLE_OFFSET, I2cEnableReg.Val32);
I2cEnableReg.bits.enable = 1;
I2C_REG_WRITE(Base + I2C_ENABLE_OFFSET, I2cEnableReg.Val32);
//检查是否成功
I2C_REG_READ(Base + I2C_ENABLE_STATUS_OFFSET, I2cEnableStatusReg.Val32);
if (1 == I2cEnableStatusReg.bits.ic_en)
{
return EFI_SUCCESS;
}
else
{
return EFI_DEVICE_ERROR;
}
}
/*****************************************************************************
函 数 名 : I2C_GetTxStatus
功能描述 : 获取TX FIFO状态
输入参数 : 无
输出参数 : 无
返 回 值 : void
调用函数 :
被调函数 :
*****************************************************************************/
UINT32 I2C_GetTxStatus(UINT32 Socket,UINT8 Port)
{
I2C0_TXFLR_U ulFifo;
UINTN Base = PlatformGetI2cBase(Socket, Port);
I2C_REG_READ(Base + I2C_TXFLR_OFFSET, ulFifo.Val32);
return ulFifo.bits.txflr;
}
UINT32
I2C_GetRxStatus(UINT32 Socket,UINT8 Port)
{
I2C0_RXFLR_U ulFifo;
UINTN Base = GetI2cBase(Socket, Port);
I2C_REG_READ(Base + I2C_RXFLR_OFFSET, ulFifo.Val32);
return ulFifo.bits.rxflr;
}
/*****************************************************************************
函 数 名 : I2C_SetTarget
功能描述 :
输入参数 : void
输出参数 : 无
返 回 值 :
调用函数 :
被调函数 :
*****************************************************************************/
void I2C_SetTarget(UINT32 Socket,UINT8 Port,UINT32 I2cDeviceAddr)
{
I2C0_TAR_U I2cTargetReg;
UINTN Base = PlatformGetI2cBase(Socket, Port);
//设置slave地址
I2C_REG_READ(Base + I2C_TAR_OFFSET, I2cTargetReg.Val32);
I2cTargetReg.bits.ic_tar = I2cDeviceAddr;
I2C_REG_WRITE(Base + I2C_TAR_OFFSET, I2cTargetReg.Val32);
return;
}
/*****************************************************************************
函 数 名 : I2c_Disable
功能描述 :
输入参数 : void
输出参数 : 无
返 回 值 :
调用函数 :
被调函数 :
*****************************************************************************/
EFI_STATUS
EFIAPI
I2C_Disable(UINT32 Socket,UINT8 Port)
{
UINT32 ulTimeCnt = I2C_READ_TIMEOUT;
I2C0_STATUS_U I2cStatusReg;
I2C0_ENABLE_U I2cEnableReg;
I2C0_ENABLE_STATUS_U I2cEnableStatusReg;
UINTN Base = PlatformGetI2cBase(Socket, Port);
I2C_REG_READ((Base + I2C_STATUS_OFFSET), I2cStatusReg.Val32);
while (I2cStatusReg.bits.activity) /* 表示此时正在进行I2C访问，需要等待 */
{
I2C_Delay(10000); /* 具体时间待定 */
ulTimeCnt--;
I2C_REG_READ(Base + I2C_STATUS_OFFSET, I2cStatusReg.Val32);
if (0 == ulTimeCnt) /* 表示已经超时，此时应该报错 */
{
return EFI_DEVICE_ERROR;
}
}
//关闭I2C
I2C_REG_READ(Base + I2C_ENABLE_OFFSET, I2cEnableReg.Val32);
I2cEnableReg.bits.enable = 0;
I2C_REG_WRITE(Base + I2C_ENABLE_OFFSET,I2cEnableReg.Val32);
//检查是否关闭成功
I2C_REG_READ(Base + I2C_ENABLE_OFFSET,I2cEnableStatusReg.Val32);
if (0 == I2cEnableStatusReg.bits.ic_en)
{
return EFI_SUCCESS;
}
else
{
return EFI_DEVICE_ERROR;
}
}
EFI_STATUS
EFIAPI
I2C_Disable(UINT32 Socket,UINT8 Port)
{
UINT32 ulTimeCnt = I2C_READ_TIMEOUT;
I2C0_STATUS_U I2cStatusReg;
I2C0_ENABLE_U I2cEnableReg;
I2C0_ENABLE_STATUS_U I2cEnableStatusReg;
UINTN Base = GetI2cBase(Socket, Port);
I2C_REG_READ((Base + I2C_STATUS_OFFSET), I2cStatusReg.Val32);
while (I2cStatusReg.bits.activity)
{
I2C_Delay(10000);
ulTimeCnt--;
I2C_REG_READ(Base + I2C_STATUS_OFFSET, I2cStatusReg.Val32);
if (0 == ulTimeCnt)
{
return EFI_DEVICE_ERROR;
}
}
I2C_REG_READ(Base + I2C_ENABLE_OFFSET, I2cEnableReg.Val32);
I2cEnableReg.bits.enable = 0;
I2C_REG_WRITE(Base + I2C_ENABLE_OFFSET,I2cEnableReg.Val32);
I2C_REG_READ(Base + I2C_ENABLE_OFFSET,I2cEnableStatusReg.Val32);
if (0 == I2cEnableStatusReg.bits.ic_en)
{
return EFI_SUCCESS;
}
else
{
return EFI_DEVICE_ERROR;
}
}
/*****************************************************************************
函 数 名 : I2CInit
功能描述 : 初始化，以便读取SPD信息
输入参数 : void
输出参数 : 无
返 回 值 :
调用函数 :
被调函数 :
修改历史 :
*****************************************************************************/
EFI_STATUS
EFIAPI
I2CInit(UINT32 Socket, UINT32 Port, SPEED_MODE SpeedMode)
{
I2C0_CON_U I2cControlReg;
I2C0_SS_SCL_HCNT_U I2cStandardSpeedSclHighCount;
I2C0_SS_SCL_LCNT_U I2cStandardSpeedSclLowCount;
I2C0_RX_TL_U I2cRxFifoReg;
I2C0_TX_TL_U I2cTxFifoReg;
I2C0_INTR_MASK_U I2cIntrMask;
EFI_STATUS Status;
UINTN Base = PlatformGetI2cBase(Socket, Port);
if((Socket >= MAX_SOCKET) || (Port >= I2C_PORT_MAX) || (SpeedMode >= SPEED_MODE_MAX)){
return EFI_INVALID_PARAMETER;
}
//关闭I2C
Status = I2C_Disable(Socket,Port);
if(EFI_ERROR(Status))
{
return EFI_DEVICE_ERROR;
}
//配置传输模式、速率等
I2C_REG_READ(Base + I2C_CON_OFFSET, I2cControlReg.Val32);
I2cControlReg.bits.master = 1; //主模式使能，默认值
I2cControlReg.bits.spedd = 0x1; //标准模式，标准模式下I2C总线的速率为100kb/s
I2cControlReg.bits.restart_en = 1; //主模式下restart指令发送使能
I2cControlReg.bits.slave_disable = 1; //从模式不使能
I2C_REG_WRITE(Base + I2C_CON_OFFSET,I2cControlReg.Val32);
//设置I2C总线时钟周期
if(Normal == SpeedMode)
{
I2C_REG_READ(Base + I2C_SS_SCL_HCNT_OFFSET,I2cStandardSpeedSclHighCount.Val32);
I2cStandardSpeedSclHighCount.bits.ic_ss_scl_hcnt = I2C_SS_SCLHCNT;
I2C_REG_WRITE(Base + I2C_SS_SCL_HCNT_OFFSET, I2cStandardSpeedSclHighCount.Val32);
I2C_REG_READ(Base + I2C_SS_SCL_LCNT_OFFSET, I2cStandardSpeedSclLowCount.Val32);
I2cStandardSpeedSclLowCount.bits.ic_ss_scl_lcnt = I2C_SS_SCLLCNT;
I2C_REG_WRITE(Base + I2C_SS_SCL_LCNT_OFFSET, I2cStandardSpeedSclLowCount.Val32);
}
else
{
I2C_REG_READ(Base + I2C_FS_SCL_HCNT_OFFSET,I2cStandardSpeedSclHighCount.Val32);
I2cStandardSpeedSclHighCount.bits.ic_ss_scl_hcnt = I2C_SS_SCLHCNT;
I2C_REG_WRITE(Base + I2C_FS_SCL_HCNT_OFFSET, I2cStandardSpeedSclHighCount.Val32);
I2C_REG_READ(Base + I2C_FS_SCL_LCNT_OFFSET, I2cStandardSpeedSclLowCount.Val32);
I2cStandardSpeedSclLowCount.bits.ic_ss_scl_lcnt = I2C_SS_SCLLCNT;
I2C_REG_WRITE(Base + I2C_FS_SCL_LCNT_OFFSET, I2cStandardSpeedSclLowCount.Val32);
}
//设置发送、接收FIFO阈值
I2C_REG_READ(Base + I2C_RX_TL_OFFSET, I2cRxFifoReg.Val32);
I2cRxFifoReg.bits.rx_tl = I2C_TXRX_THRESHOLD;
I2C_REG_WRITE(Base + I2C_RX_TL_OFFSET, I2cRxFifoReg.Val32);
I2C_REG_READ(Base + I2C_TX_TL_OFFSET,I2cTxFifoReg.Val32);
I2cTxFifoReg.bits.tx_tl = I2C_TXRX_THRESHOLD;
I2C_REG_WRITE(Base + I2C_TX_TL_OFFSET, I2cTxFifoReg.Val32);
//禁止所有中断
I2C_REG_READ(Base + I2C_INTR_MASK_OFFSET, I2cIntrMask.Val32);
I2cIntrMask.Val32 = 0x0;
I2C_REG_WRITE(Base + I2C_INTR_MASK_OFFSET, I2cIntrMask.Val32);
//使能I2C
Status = I2C_Enable(Socket,Port);
if(EFI_ERROR(Status))
{
return EFI_DEVICE_ERROR;
}
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
I2CInit(UINT32 Socket, UINT32 Port, SPEED_MODE SpeedMode)
{
I2C0_CON_U I2cControlReg;
I2C0_SS_SCL_HCNT_U I2cStandardSpeedSclHighCount;
I2C0_SS_SCL_LCNT_U I2cStandardSpeedSclLowCount;
I2C0_RX_TL_U I2cRxFifoReg;
I2C0_TX_TL_U I2cTxFifoReg;
I2C0_INTR_MASK_U I2cIntrMask;
EFI_STATUS Status;
UINTN Base = GetI2cBase(Socket, Port);
if((Socket >= MAX_SOCKET) || (Port >= I2C_PORT_MAX) || (SpeedMode >= SPEED_MODE_MAX)){
return EFI_INVALID_PARAMETER;
}
Status = I2C_Disable(Socket,Port);
if(EFI_ERROR(Status))
{
return EFI_DEVICE_ERROR;
}
I2C_REG_READ(Base + I2C_CON_OFFSET, I2cControlReg.Val32);
I2cControlReg.bits.master = 1;
I2cControlReg.bits.spedd = 0x1;
I2cControlReg.bits.restart_en = 1;
I2cControlReg.bits.slave_disable = 1;
I2C_REG_WRITE(Base + I2C_CON_OFFSET,I2cControlReg.Val32);
if(Normal == SpeedMode)
{
I2C_REG_READ(Base + I2C_SS_SCL_HCNT_OFFSET,I2cStandardSpeedSclHighCount.Val32);
I2cStandardSpeedSclHighCount.bits.ic_ss_scl_hcnt = I2C_SS_SCLHCNT;
I2C_REG_WRITE(Base + I2C_SS_SCL_HCNT_OFFSET, I2cStandardSpeedSclHighCount.Val32);
I2C_REG_READ(Base + I2C_SS_SCL_LCNT_OFFSET, I2cStandardSpeedSclLowCount.Val32);
I2cStandardSpeedSclLowCount.bits.ic_ss_scl_lcnt = I2C_SS_SCLLCNT;
I2C_REG_WRITE(Base + I2C_SS_SCL_LCNT_OFFSET, I2cStandardSpeedSclLowCount.Val32);
}
else
{
I2C_REG_READ(Base + I2C_FS_SCL_HCNT_OFFSET,I2cStandardSpeedSclHighCount.Val32);
I2cStandardSpeedSclHighCount.bits.ic_ss_scl_hcnt = I2C_SS_SCLHCNT;
I2C_REG_WRITE(Base + I2C_FS_SCL_HCNT_OFFSET, I2cStandardSpeedSclHighCount.Val32);
I2C_REG_READ(Base + I2C_FS_SCL_LCNT_OFFSET, I2cStandardSpeedSclLowCount.Val32);
I2cStandardSpeedSclLowCount.bits.ic_ss_scl_lcnt = I2C_SS_SCLLCNT;
I2C_REG_WRITE(Base + I2C_FS_SCL_LCNT_OFFSET, I2cStandardSpeedSclLowCount.Val32);
}
I2C_REG_READ(Base + I2C_RX_TL_OFFSET, I2cRxFifoReg.Val32);
I2cRxFifoReg.bits.rx_tl = I2C_TXRX_THRESHOLD;
I2C_REG_WRITE(Base + I2C_RX_TL_OFFSET, I2cRxFifoReg.Val32);
I2C_REG_READ(Base + I2C_TX_TL_OFFSET,I2cTxFifoReg.Val32);
I2cTxFifoReg.bits.tx_tl = I2C_TXRX_THRESHOLD;
I2C_REG_WRITE(Base + I2C_TX_TL_OFFSET, I2cTxFifoReg.Val32);
I2C_REG_READ(Base + I2C_INTR_MASK_OFFSET, I2cIntrMask.Val32);
I2cIntrMask.Val32 = 0x0;
I2C_REG_WRITE(Base + I2C_INTR_MASK_OFFSET, I2cIntrMask.Val32);
Status = I2C_Enable(Socket,Port);
if(EFI_ERROR(Status))
{
return EFI_DEVICE_ERROR;
}
return I2cLibRuntimeSetup (Socket, Port);
}
unsigned char i2c_reg_read(unsigned char addr, unsigned char reg)
{
return(I2C_REG_READ(addr, reg));
}
