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[USBOHCI_NEW] Simplify the MapTransferToTD routine and add some docs

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Victor Perevertkin 2019-06-25 13:02:35 +03:00
parent 3fb5ca3bee
commit 3fe397818a
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1 changed files with 73 additions and 60 deletions
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111
drivers/usb/usbohci_new/usbohci.c
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@ -1141,23 +1141,28 @@ OHCI_InterruptDpc(IN PVOID ohciExtension,
}
}
/**
* @brief Forms the next General Transfer Descriptor for the current transfer
*
* @param[in] OhciExtension The ohci extension
* @param[in] TransferedLen The consolidated length of all previous descriptors' buffers
* @param[in] OhciTransfer The ohci transfer
* @param[out] TD The transfer descriptor we are forming
* @param[in] SGList The scatter/gather list
*
* @return The length of all previous buffers summed with the length of the current buffer
*/
static
ULONG
NTAPI
OHCI_MapTransferToTD(IN POHCI_EXTENSION OhciExtension,
IN ULONG MaxPacketSize,
IN OUT ULONG TransferedLen,
IN ULONG TransferedLen,
IN POHCI_TRANSFER OhciTransfer,
IN POHCI_HCD_TD TD,
OUT POHCI_HCD_TD TD,
IN PUSBPORT_SCATTER_GATHER_LIST SGList)
{
PUSBPORT_SCATTER_GATHER_ELEMENT SgElement;
ULONG SgIdx;
ULONG SgRemain;
ULONG LengthThisTd;
ULONG BufferEnd;
ULONG Offset;
ULONG TransferLength;
ULONG Buffer;
ULONG SgIdx, CurrentTransferLen, BufferEnd, CurrentBuffer;
ULONG TransferDataLeft = OhciTransfer->TransferParameters->TransferBufferLength - TransferedLen;
DPRINT_OHCI("OHCI_MapTransferToTD: TransferedLen - %x\n", TransferedLen);
@ -1177,49 +1182,50 @@ OHCI_MapTransferToTD(IN POHCI_EXTENSION OhciExtension,
SGList->SgElementCount);
ASSERT(SgIdx < SGList->SgElementCount);
ASSERT(TransferedLen == SgElement->SgOffset);
Offset = TransferedLen - SGList->SgElement[SgIdx].SgOffset;
Buffer = SGList->SgElement[SgIdx].SgPhysicalAddress.LowPart + Offset;
/* The buffer for a TD can be 0 to 8192 bytes long,
* and can span within mo more than two 4k pages (see OpenHCI spec 3.3.2)
* CurrentBuffer - the (physical) address of the first byte in the buffer
* BufferEnd - the address of the last byte in the buffer. It can be on a different physical 4k page
* when a controller will reach the end of a page from CurrentBuffer, it will take the first 20 bits
* of the BufferEnd as a next address (OpenHCI spec, 4.3.1.3.1)
*/
SgRemain = SGList->SgElementCount - SgIdx;
CurrentBuffer = SgElement->SgPhysicalAddress.LowPart;
if (SgRemain == 1)
if (TransferDataLeft <= SgElement->SgTransferLength)
{
LengthThisTd = OhciTransfer->TransferParameters->TransferBufferLength -
TransferedLen -
Offset;
BufferEnd = SGList->SgElement[SgIdx].SgPhysicalAddress.LowPart +
LengthThisTd;
}
else if (SgRemain == 2)
{
LengthThisTd = OhciTransfer->TransferParameters->TransferBufferLength -
TransferedLen;
BufferEnd = SGList->SgElement[SgIdx + 1].SgPhysicalAddress.LowPart +
SGList->SgElement[SgIdx + 1].SgTransferLength;
CurrentTransferLen = TransferDataLeft;
BufferEnd = SgElement->SgPhysicalAddress.LowPart + CurrentTransferLen - 1;
}
else
{
TransferLength = SGList->SgElement[SgIdx].SgTransferLength +
SGList->SgElement[SgIdx+1].SgTransferLength -
Offset;
PUSBPORT_SCATTER_GATHER_ELEMENT SgNextElement;
ASSERT(SGList->SgElementCount - SgIdx > 1);
BufferEnd = SGList->SgElement[SgIdx + 1].SgPhysicalAddress.LowPart +
SGList->SgElement[SgIdx + 1].SgTransferLength;
SgNextElement = &SGList->SgElement[SgIdx + 1];
LengthThisTd = MaxPacketSize * (TransferLength / MaxPacketSize);
TransferDataLeft -= SgElement->SgTransferLength;
CurrentTransferLen = SgElement->SgTransferLength;
if (TransferLength > LengthThisTd)
BufferEnd -= (TransferLength - LengthThisTd);
if (TransferDataLeft <= SgNextElement->SgTransferLength)
{
CurrentTransferLen += TransferDataLeft;
BufferEnd = SgNextElement->SgPhysicalAddress.LowPart + TransferDataLeft - 1;
}
else
{
CurrentTransferLen += SgNextElement->SgTransferLength;
BufferEnd = SgNextElement->SgPhysicalAddress.LowPart + SgNextElement->SgTransferLength - 1;
}
}
TD->HwTD.gTD.CurrentBuffer = Buffer;
TD->HwTD.gTD.BufferEnd = BufferEnd - 1;
TD->TransferLen = LengthThisTd;
TD->HwTD.gTD.CurrentBuffer = CurrentBuffer;
TD->HwTD.gTD.BufferEnd = BufferEnd;
TD->TransferLen = CurrentTransferLen;
return TransferedLen + LengthThisTd;
return TransferedLen + CurrentTransferLen;
}
POHCI_HCD_TD
@ -1287,7 +1293,6 @@ OHCI_ControlTransfer(IN POHCI_EXTENSION OhciExtension,
POHCI_HCD_TD NextTD;
ULONG MaxTDs;
ULONG TransferedLen;
ULONG MaxPacketSize;
ULONG BufferEnd;
UCHAR DataToggle;
@ -1357,8 +1362,6 @@ OHCI_ControlTransfer(IN POHCI_EXTENSION OhciExtension,
PrevTD->HwTD.gTD.NextTD = TD2->PhysicalAddress;
PrevTD->NextHcdTD = TD2;
MaxPacketSize = OhciEndpoint->EndpointProperties.TotalMaxPacketSize;
TransferedLen = 0;
DataToggle = OHCI_TD_DATA_TOGGLE_DATA1;
@ -1378,7 +1381,6 @@ OHCI_ControlTransfer(IN POHCI_EXTENSION OhciExtension,
DataToggle = OHCI_TD_DATA_TOGGLE_FROM_ED;
TransferedLen = OHCI_MapTransferToTD(OhciExtension,
MaxPacketSize,
TransferedLen,
OhciTransfer,
TD,
@ -1457,6 +1459,18 @@ OHCI_ControlTransfer(IN POHCI_EXTENSION OhciExtension,
return MP_STATUS_SUCCESS;
}
/**
* @brief Creates the transfer descriptor chain for the given transfer's buffer
* and attaches it to a given endpoint (for bulk or interrupt transfers)
*
* @param[in] OhciExtension The ohci extension
* @param[in] OhciEndpoint The ohci endpoint
* @param[in] TransferParameters The transfer parameters
* @param[in] OhciTransfer The ohci transfer
* @param[in] SGList The scatter/gather list
*
* @return MP_STATUS_SUCCESS or MP_STATUS_FAILURE if there are not enough TDs left
*/
MPSTATUS
NTAPI
OHCI_BulkOrInterruptTransfer(IN POHCI_EXTENSION OhciExtension,
@ -1469,7 +1483,6 @@ OHCI_BulkOrInterruptTransfer(IN POHCI_EXTENSION OhciExtension,
POHCI_HCD_TD PrevTD;
ULONG TransferedLen;
ULONG MaxTDs;
ULONG MaxPacketSize;
DPRINT_OHCI("OHCI_BulkOrInterruptTransfer: ... \n");
@ -1515,10 +1528,7 @@ OHCI_BulkOrInterruptTransfer(IN POHCI_EXTENSION OhciExtension,
if (TransferParameters->TransferBufferLength)
{
MaxPacketSize = OhciEndpoint->EndpointProperties.TotalMaxPacketSize;
TransferedLen = OHCI_MapTransferToTD(OhciExtension,
MaxPacketSize,
TransferedLen,
OhciTransfer,
TD,
@ -1554,6 +1564,9 @@ OHCI_BulkOrInterruptTransfer(IN POHCI_EXTENSION OhciExtension,
PrevTD->HwTD.gTD.NextTD = TD->PhysicalAddress;
PrevTD->NextHcdTD = TD;
/* The last TD in a chain is not used in a transfer. The controller does not access it
* so it will be used for chaining a next transfer to it (OpenHCI spec, 4.6)
*/
TD->HwTD.gTD.NextTD = 0;
TD->NextHcdTD = 0;