In 'MdeModulePkg\Bus\I2c\I2cDxe', since the following protocol is not installed:
gEfiI2cMasterProtocolGuid
gEfiI2cEnumerateProtocolGuid
gEfiI2cBusConfigurationManagementProtocolGuid
So I refer to the example of
\edk2-platforms\Silicon\Marvell\Drivers\I2c\MvI2cDxe and add the following
related items
Status = gBS->InstallMultipleProtocolInterfaces(
&I2cMasterContext->Controller,
&gEfiI2cMasterProtocolGuid,
&I2cMasterContext->I2cMaster,
&gEfiI2cEnumerateProtocolGuid,
&I2cMasterContext->I2cEnumerate,
&gEfiI2cBusConfigurationManagementProtocolGuid,
&I2cMasterContext->I2cBusConf,
&gEfiDevicePathProtocolGuid,
(EFI_DEVICE_PATH_PROTOCOL *) DevicePath,
NULL);
In addition, use the following methods to obtain gI2CIO in the app,
Status = gBS->LocateHandleBuffer(
ByProtocol,
&gEfiI2cIoProtocolGuid,
NULL,
&HandleCount,
&I2CIOHandleBuffer
);
for (HandleIndex = 0; HandleIndex < HandleCount; HandleIndex++)
{
Status = gBS->HandleProtocol(
I2CIOHandleBuffer[HandleIndex],
&gEfiI2cIoProtocolGuid,
(VOID**)&gI2CIO);
}
Then use the following methods to perform I2C IO operations.
I2cIo->QueueRequest(I2cIo, 0, NULL, RequestPacket, NULL);
But finally I saw the following message, and measured by LA, I2C IO did not
send data:
MvI2cDxe: wrong I2cStatus (00) after sending START condition
message from
MvI2cLockedStart (
IN I2C_MASTER_CONTEXT *I2cMasterContext,
IN INT32 Mask,
IN UINT8 Slave,
IN UINTN Timeout
)
{
…
I2cStatus = I2C_READ(I2cMasterContext, I2C_STATUS);
if ((INT32)I2cStatus != Mask) {
DEBUG((DEBUG_ERROR, "MvI2cDxe: wrong I2cStatus (%02x) after sending %sSTART
condition\n", I2cStatus, Mask == I2C_STATUS_START ? "" : "repeated "));
return EFI_DEVICE_ERROR;
}
Where I2C_READ is defined as follows:
STATIC
UINT32
I2C_READ(
IN I2C_MASTER_CONTEXT *I2cMasterContext,
IN UINTN off)
{
return MmioRead32 (I2cMasterContext->BaseAddress + off);
}
My environment is as follows
Platform: MinnowBoard max
Code: edk2-platforms\Platform\Intel\Vlv2TbltDevicePkg
My questions are as follows:
* In MinnowBoard, can MmioRead32 (I2cMasterContext->BaseAddress + off) IO
operations be performed directly like MvI2cDxe?
* How to set BaseAddress(host controller address) in MinnowBoard?
* How to set Controller’s input clock frequency?
* Are there other examples of the I2C master protocol for reference?
Any advice is greatly appreciated!
Thanks!
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