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* Patch by Peter Ryser, 20 Feb 2004: Add support for the Xilinx ML300 platform * Patch by Stephan Linz, 17 Feb 2004: Fix watchdog support for NIOS * Patch by Josh Fryman, 16 Feb 2004: Fix byte-swapping for cfi_flash.c for different bus widths * Patch by Jon Diekema, 14 Jeb 2004: Remove duplicate "FPGA Support" notes from the README file
2004-02-23 23:54:43 +00:00
/******************************************************************************
*
* Author: Xilinx, Inc.
*
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*
* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A
* COURTESY TO YOU. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS
* ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION OR STANDARD,
* XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION IS FREE
* FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE FOR OBTAINING
* ANY THIRD PARTY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION.
* XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO
* THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY
* WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM
* CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE.
*
*
* Xilinx hardware products are not intended for use in life support
* appliances, devices, or systems. Use in such applications is
* expressly prohibited.
*
*
* (c) Copyright 2002-2004 Xilinx Inc.
* All rights reserved.
*
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
******************************************************************************/
/*****************************************************************************/
/**
*
* @file xemac.c
*
* The XEmac driver. Functions in this file are the minimum required functions
* for this driver. See xemac.h for a detailed description of the driver.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ---- -------- -------------------------------------------------------
* 1.00a rpm 07/31/01 First release
* 1.00b rpm 02/20/02 Repartitioned files and functions
* 1.00b rpm 07/23/02 Removed the PHY reset from Initialize()
* 1.00b rmm 09/23/02 Removed commented code in Initialize(). Recycled as
* XEmac_mPhyReset macro in xemac_l.h.
* 1.00c rpm 12/05/02 New version includes support for simple DMA
* 1.00c rpm 12/12/02 Changed location of IsStarted assignment in XEmac_Start
* to be sure the flag is set before the device and
* interrupts are enabled.
* 1.00c rpm 02/03/03 SelfTest was not clearing polled mode. Take driver out
* of polled mode in XEmac_Reset() to fix this problem.
* 1.00c rmm 05/13/03 Fixed diab compiler warnings relating to asserts.
* </pre>
******************************************************************************/
/***************************** Include Files *********************************/
#include "xbasic_types.h"
#include "xemac_i.h"
#include "xio.h"
#include "xipif_v1_23_b.h" /* Uses v1.23b of the IPIF */
/************************** Constant Definitions *****************************/
/**************************** Type Definitions *******************************/
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
static XStatus ConfigureDma(XEmac * InstancePtr);
static XStatus ConfigureFifo(XEmac * InstancePtr);
static void StubFifoHandler(void *CallBackRef);
static void StubErrorHandler(void *CallBackRef, XStatus ErrorCode);
static void StubSgHandler(void *CallBackRef, XBufDescriptor * BdPtr,
u32 NumBds);
/************************** Variable Definitions *****************************/
/*****************************************************************************/
/**
*
* Initialize a specific XEmac instance/driver. The initialization entails:
* - Initialize fields of the XEmac structure
* - Clear the Ethernet statistics for this device
* - Initialize the IPIF component with its register base address
* - Configure the FIFO components with their register base addresses.
* - If the device is configured with DMA, configure the DMA channel components
* with their register base addresses. At some later time, memory pools for
* the scatter-gather descriptor lists may be passed to the driver.
* - Reset the Ethernet MAC
*
* @param InstancePtr is a pointer to the XEmac instance to be worked on.
* @param DeviceId is the unique id of the device controlled by this XEmac
* instance. Passing in a device id associates the generic XEmac
* instance to a specific device, as chosen by the caller or application
* developer.
*
* @return
*
* - XST_SUCCESS if initialization was successful
* - XST_DEVICE_IS_STARTED if the device has already been started
* - XST_DEVICE_NOT_FOUND if device configuration information was not found for
* a device with the supplied device ID.
*
* @note
*
* None.
*
******************************************************************************/
XStatus
XEmac_Initialize(XEmac * InstancePtr, u16 DeviceId)
{
XStatus Result;
XEmac_Config *ConfigPtr; /* configuration information */
XASSERT_NONVOID(InstancePtr != NULL);
/*
* If the device is started, disallow the initialize and return a status
* indicating it is started. This allows the user to stop the device
* and reinitialize, but prevents a user from inadvertently initializing
*/
if (InstancePtr->IsStarted == XCOMPONENT_IS_STARTED) {
return XST_DEVICE_IS_STARTED;
}
/*
* Lookup the device configuration in the temporary CROM table. Use this
* configuration info down below when initializing this component.
*/
ConfigPtr = XEmac_LookupConfig(DeviceId);
if (ConfigPtr == NULL) {
return XST_DEVICE_NOT_FOUND;
}
/*
* Set some default values
*/
InstancePtr->IsReady = 0;
InstancePtr->IsStarted = 0;
InstancePtr->IpIfDmaConfig = ConfigPtr->IpIfDmaConfig;
InstancePtr->HasMii = ConfigPtr->HasMii;
InstancePtr->HasMulticastHash = FALSE;
/* Always default polled to false, let user configure this mode */
InstancePtr->IsPolled = FALSE;
InstancePtr->FifoRecvHandler = StubFifoHandler;
InstancePtr->FifoSendHandler = StubFifoHandler;
InstancePtr->ErrorHandler = StubErrorHandler;
InstancePtr->SgRecvHandler = StubSgHandler;
InstancePtr->SgSendHandler = StubSgHandler;
/*
* Clear the statistics for this driver
*/
XEmac_mClearStruct((u8 *) & InstancePtr->Stats, sizeof (XEmac_Stats));
/*
* Initialize the device register base addresses
*/
InstancePtr->BaseAddress = ConfigPtr->BaseAddress;
/*
* Configure the send and receive FIFOs in the MAC
*/
Result = ConfigureFifo(InstancePtr);
if (Result != XST_SUCCESS) {
return Result;
}
/*
* If the device is configured for DMA, configure the send and receive DMA
* channels in the MAC.
*/
if (XEmac_mIsDma(InstancePtr)) {
Result = ConfigureDma(InstancePtr);
if (Result != XST_SUCCESS) {
return Result;
}
}
/*
* Indicate the component is now ready to use. Note that this is done before
* we reset the device and the PHY below, which may seem a bit odd. The
* choice was made to move it here rather than remove the asserts in various
* functions (e.g., Reset() and all functions that it calls). Applications
* that use multiple threads, one to initialize the XEmac driver and one
* waiting on the IsReady condition could have a problem with this sequence.
*/
InstancePtr->IsReady = XCOMPONENT_IS_READY;
/*
* Reset the MAC to get it into its initial state. It is expected that
* device configuration by the user will take place after this
* initialization is done, but before the device is started.
*/
XEmac_Reset(InstancePtr);
return XST_SUCCESS;
}
/*****************************************************************************/
/**
*
* Start the Ethernet controller as follows:
* - If not in polled mode
* - Set the internal interrupt enable registers appropriately
* - Enable interrupts within the device itself. Note that connection of
* the driver's interrupt handler to the interrupt source (typically
* done using the interrupt controller component) is done by the higher
* layer software.
* - If the device is configured with scatter-gather DMA, start the DMA
* channels if the descriptor lists are not empty
* - Enable the transmitter
* - Enable the receiver
*
* The PHY is enabled after driver initialization. We assume the upper layer
* software has configured it and the EMAC appropriately before this function
* is called.
*
* @param InstancePtr is a pointer to the XEmac instance to be worked on.
*
* @return
*
* - XST_SUCCESS if the device was started successfully
* - XST_NO_CALLBACK if a callback function has not yet been registered using
* the SetxxxHandler function. This is required if in interrupt mode.
* - XST_DEVICE_IS_STARTED if the device is already started
* - XST_DMA_SG_NO_LIST if configured for scatter-gather DMA and a descriptor
* list has not yet been created for the send or receive channel.
*
* @note
*
* The driver tries to match the hardware configuration. So if the hardware
* is configured with scatter-gather DMA, the driver expects to start the
* scatter-gather channels and expects that the user has set up the buffer
* descriptor lists already. If the user expects to use the driver in a mode
* different than how the hardware is configured, the user should modify the
* configuration table to reflect the mode to be used. Modifying the config
* table is a workaround for now until we get some experience with how users
* are intending to use the hardware in its different configurations. For
* example, if the hardware is built with scatter-gather DMA but the user is
* intending to use only simple DMA, the user either needs to modify the config
* table as a workaround or rebuild the hardware with only simple DMA.
*
* This function makes use of internal resources that are shared between the
* Start, Stop, and SetOptions functions. So if one task might be setting device
* options while another is trying to start the device, the user is required to
* provide protection of this shared data (typically using a semaphore).
*
******************************************************************************/
XStatus
XEmac_Start(XEmac * InstancePtr)
{
u32 ControlReg;
XStatus Result;
XASSERT_NONVOID(InstancePtr != NULL);
XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
/*
* If it is already started, return a status indicating so
*/
if (InstancePtr->IsStarted == XCOMPONENT_IS_STARTED) {
return XST_DEVICE_IS_STARTED;
}
/*
* If not polled, enable interrupts
*/
if (!InstancePtr->IsPolled) {
/*
* Verify that the callbacks have been registered, then enable
* interrupts
*/
if (XEmac_mIsSgDma(InstancePtr)) {
if ((InstancePtr->SgRecvHandler == StubSgHandler) ||
(InstancePtr->SgSendHandler == StubSgHandler)) {
return XST_NO_CALLBACK;
}
/* Enable IPIF interrupts */
XIIF_V123B_WRITE_DIER(InstancePtr->BaseAddress,
XEM_IPIF_DMA_DFT_MASK |
XIIF_V123B_ERROR_MASK);
XIIF_V123B_WRITE_IIER(InstancePtr->BaseAddress,
XEM_EIR_DFT_SG_MASK);
/* Enable scatter-gather DMA interrupts */
XDmaChannel_SetIntrEnable(&InstancePtr->RecvChannel,
XEM_DMA_SG_INTR_MASK);
XDmaChannel_SetIntrEnable(&InstancePtr->SendChannel,
XEM_DMA_SG_INTR_MASK);
} else {
if ((InstancePtr->FifoRecvHandler == StubFifoHandler) ||
(InstancePtr->FifoSendHandler == StubFifoHandler)) {
return XST_NO_CALLBACK;
}
/* Enable IPIF interrupts (used by simple DMA also) */
XIIF_V123B_WRITE_DIER(InstancePtr->BaseAddress,
XEM_IPIF_FIFO_DFT_MASK |
XIIF_V123B_ERROR_MASK);
XIIF_V123B_WRITE_IIER(InstancePtr->BaseAddress,
XEM_EIR_DFT_FIFO_MASK);
}
/* Enable the global IPIF interrupt output */
XIIF_V123B_GINTR_ENABLE(InstancePtr->BaseAddress);
}
/*
* Indicate that the device is started before we enable the transmitter
* or receiver. This needs to be done before because as soon as the
* receiver is enabled we may get an interrupt, and there are functions
* in the interrupt handling path that rely on the IsStarted flag.
*/
InstancePtr->IsStarted = XCOMPONENT_IS_STARTED;
/*
* Enable the transmitter, and receiver (do a read/modify/write to preserve
* current settings). There is no critical section here since this register
* is not modified during interrupt context.
*/
ControlReg = XIo_In32(InstancePtr->BaseAddress + XEM_ECR_OFFSET);
ControlReg &= ~(XEM_ECR_XMIT_RESET_MASK | XEM_ECR_RECV_RESET_MASK);
ControlReg |= (XEM_ECR_XMIT_ENABLE_MASK | XEM_ECR_RECV_ENABLE_MASK);
XIo_Out32(InstancePtr->BaseAddress + XEM_ECR_OFFSET, ControlReg);
/*
* If configured with scatter-gather DMA and not polled, restart the
* DMA channels in case there are buffers ready to be sent or received into.
* The DMA SgStart function uses data that can be modified during interrupt
* context, so a critical section is required here.
*/
if ((XEmac_mIsSgDma(InstancePtr)) && (!InstancePtr->IsPolled)) {
XIIF_V123B_GINTR_DISABLE(InstancePtr->BaseAddress);
/*
* The only error we care about is if the list has not yet been
* created, or on receive, if no buffer descriptors have been
* added yet (the list is empty). Other errors are benign at this point.
*/
Result = XDmaChannel_SgStart(&InstancePtr->RecvChannel);
if ((Result == XST_DMA_SG_NO_LIST)
|| (Result == XST_DMA_SG_LIST_EMPTY)) {
XIIF_V123B_GINTR_ENABLE(InstancePtr->BaseAddress);
return Result;
}
Result = XDmaChannel_SgStart(&InstancePtr->SendChannel);
if (Result == XST_DMA_SG_NO_LIST) {
XIIF_V123B_GINTR_ENABLE(InstancePtr->BaseAddress);
return Result;
}
XIIF_V123B_GINTR_ENABLE(InstancePtr->BaseAddress);
}
return XST_SUCCESS;
}
/*****************************************************************************/
/**
*
* Stop the Ethernet MAC as follows:
* - If the device is configured with scatter-gather DMA, stop the DMA
* channels (wait for acknowledgment of stop)
* - Disable the transmitter and receiver
* - Disable interrupts if not in polled mode (the higher layer software is
* responsible for disabling interrupts at the interrupt controller)
*
* The PHY is left enabled after a Stop is called.
*
* If the device is configured for scatter-gather DMA, the DMA engine stops at
* the next buffer descriptor in its list. The remaining descriptors in the list
* are not removed, so anything in the list will be transmitted or received when
* the device is restarted. The side effect of doing this is that the last
* buffer descriptor processed by the DMA engine before stopping may not be the
* last descriptor in the Ethernet frame. So when the device is restarted, a
* partial frame (i.e., a bad frame) may be transmitted/received. This is only a
* concern if a frame can span multiple buffer descriptors, which is dependent
* on the size of the network buffers.
*
* @param InstancePtr is a pointer to the XEmac instance to be worked on.
*
* @return
*
* - XST_SUCCESS if the device was stopped successfully
* - XST_DEVICE_IS_STOPPED if the device is already stopped
*
* @note
*
* This function makes use of internal resources that are shared between the
* Start, Stop, and SetOptions functions. So if one task might be setting device
* options while another is trying to start the device, the user is required to
* provide protection of this shared data (typically using a semaphore).
*
******************************************************************************/
XStatus
XEmac_Stop(XEmac * InstancePtr)
{
u32 ControlReg;
XASSERT_NONVOID(InstancePtr != NULL);
XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
/*
* If the device is already stopped, do nothing but return a status
* indicating so
*/
if (InstancePtr->IsStarted != XCOMPONENT_IS_STARTED) {
return XST_DEVICE_IS_STOPPED;
}
/*
* If configured for scatter-gather DMA, stop the DMA channels. Ignore
* the XST_DMA_SG_IS_STOPPED return code. There is a critical section
* here between SgStart and SgStop, and SgStart can be called in interrupt
* context, so disable interrupts while calling SgStop.
*/
if (XEmac_mIsSgDma(InstancePtr)) {
XBufDescriptor *BdTemp; /* temporary descriptor pointer */
XIIF_V123B_GINTR_DISABLE(InstancePtr->BaseAddress);
(void) XDmaChannel_SgStop(&InstancePtr->SendChannel, &BdTemp);
(void) XDmaChannel_SgStop(&InstancePtr->RecvChannel, &BdTemp);
XIIF_V123B_GINTR_ENABLE(InstancePtr->BaseAddress);
}
/*
* Disable the transmitter and receiver. There is no critical section
* here since this register is not modified during interrupt context.
*/
ControlReg = XIo_In32(InstancePtr->BaseAddress + XEM_ECR_OFFSET);
ControlReg &= ~(XEM_ECR_XMIT_ENABLE_MASK | XEM_ECR_RECV_ENABLE_MASK);
XIo_Out32(InstancePtr->BaseAddress + XEM_ECR_OFFSET, ControlReg);
/*
* If not in polled mode, disable interrupts for IPIF (includes MAC and
* DMAs)
*/
if (!InstancePtr->IsPolled) {
XIIF_V123B_GINTR_DISABLE(InstancePtr->BaseAddress);
}
InstancePtr->IsStarted = 0;
return XST_SUCCESS;
}
/*****************************************************************************/
/**
*
* Reset the Ethernet MAC. This is a graceful reset in that the device is stopped
* first. Resets the DMA channels, the FIFOs, the transmitter, and the receiver.
* The PHY is not reset. Any frames in the scatter-gather descriptor lists will
* remain in the lists. The side effect of doing this is that after a reset and
* following a restart of the device, frames that were in the list before the
* reset may be transmitted or received. Reset must only be called after the
* driver has been initialized.
*
* The driver is also taken out of polled mode if polled mode was set. The user
* is responsbile for re-configuring the driver into polled mode after the
* reset if desired.
*
* The configuration after this reset is as follows:
* - Half duplex
* - Disabled transmitter and receiver
* - Enabled PHY (the PHY is not reset)
* - MAC transmitter does pad insertion, FCS insertion, and source address
* overwrite.
* - MAC receiver does not strip padding or FCS
* - Interframe Gap as recommended by IEEE Std. 802.3 (96 bit times)
* - Unicast addressing enabled
* - Broadcast addressing enabled
* - Multicast addressing disabled (addresses are preserved)
* - Promiscuous addressing disabled
* - Default packet threshold and packet wait bound register values for
* scatter-gather DMA operation
* - MAC address of all zeros
* - Non-polled mode
*
* The upper layer software is responsible for re-configuring (if necessary)
* and restarting the MAC after the reset. Note that the PHY is not reset. PHY
* control is left to the upper layer software. Note also that driver statistics
* are not cleared on reset. It is up to the upper layer software to clear the
* statistics if needed.
*
* When a reset is required due to an internal error, the driver notifies the
* upper layer software of this need through the ErrorHandler callback and
* specific status codes. The upper layer software is responsible for calling
* this Reset function and then re-configuring the device.
*
* @param InstancePtr is a pointer to the XEmac instance to be worked on.
*
* @return
*
* None.
*
* @note
*
* None.
*
* @internal
*
* The reset is accomplished by setting the IPIF reset register. This takes
* care of resetting all hardware blocks, including the MAC.
*
******************************************************************************/
void
XEmac_Reset(XEmac * InstancePtr)
{
XASSERT_VOID(InstancePtr != NULL);
XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
/*
* Stop the device first
*/
(void) XEmac_Stop(InstancePtr);
/*
* Take the driver out of polled mode
*/
InstancePtr->IsPolled = FALSE;
/*
* Reset the entire IPIF at once. If we choose someday to reset each
* hardware block separately, the reset should occur in the direction of
* data flow. For example, for the send direction the reset order is DMA
* first, then FIFO, then the MAC transmitter.
*/
XIIF_V123B_RESET(InstancePtr->BaseAddress);
if (XEmac_mIsSgDma(InstancePtr)) {
/*
* After reset, configure the scatter-gather DMA packet threshold and
* packet wait bound registers to default values. Ignore the return
* values of these functions since they only return error if the device
* is not stopped.
*/
(void) XEmac_SetPktThreshold(InstancePtr, XEM_SEND,
XEM_SGDMA_DFT_THRESHOLD);
(void) XEmac_SetPktThreshold(InstancePtr, XEM_RECV,
XEM_SGDMA_DFT_THRESHOLD);
(void) XEmac_SetPktWaitBound(InstancePtr, XEM_SEND,
XEM_SGDMA_DFT_WAITBOUND);
(void) XEmac_SetPktWaitBound(InstancePtr, XEM_RECV,
XEM_SGDMA_DFT_WAITBOUND);
}
}
/*****************************************************************************/
/**
*
* Set the MAC address for this driver/device. The address is a 48-bit value.
* The device must be stopped before calling this function.
*
* @param InstancePtr is a pointer to the XEmac instance to be worked on.
* @param AddressPtr is a pointer to a 6-byte MAC address.
*
* @return
*
* - XST_SUCCESS if the MAC address was set successfully
* - XST_DEVICE_IS_STARTED if the device has not yet been stopped
*
* @note
*
* None.
*
******************************************************************************/
XStatus
XEmac_SetMacAddress(XEmac * InstancePtr, u8 * AddressPtr)
{
u32 MacAddr = 0;
XASSERT_NONVOID(InstancePtr != NULL);
XASSERT_NONVOID(AddressPtr != NULL);
XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
/*
* The device must be stopped before setting the MAC address
*/
if (InstancePtr->IsStarted == XCOMPONENT_IS_STARTED) {
return XST_DEVICE_IS_STARTED;
}
/*
* Set the device station address high and low registers
*/
MacAddr = (AddressPtr[0] << 8) | AddressPtr[1];
XIo_Out32(InstancePtr->BaseAddress + XEM_SAH_OFFSET, MacAddr);
MacAddr = (AddressPtr[2] << 24) | (AddressPtr[3] << 16) |
(AddressPtr[4] << 8) | AddressPtr[5];
XIo_Out32(InstancePtr->BaseAddress + XEM_SAL_OFFSET, MacAddr);
return XST_SUCCESS;
}
/*****************************************************************************/
/**
*
* Get the MAC address for this driver/device.
*
* @param InstancePtr is a pointer to the XEmac instance to be worked on.
* @param BufferPtr is an output parameter, and is a pointer to a buffer into
* which the current MAC address will be copied. The buffer must be at
* least 6 bytes.
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
void
XEmac_GetMacAddress(XEmac * InstancePtr, u8 * BufferPtr)
{
u32 MacAddrHi;
u32 MacAddrLo;
XASSERT_VOID(InstancePtr != NULL);
XASSERT_VOID(BufferPtr != NULL);
XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
MacAddrHi = XIo_In32(InstancePtr->BaseAddress + XEM_SAH_OFFSET);
MacAddrLo = XIo_In32(InstancePtr->BaseAddress + XEM_SAL_OFFSET);
BufferPtr[0] = (u8) (MacAddrHi >> 8);
BufferPtr[1] = (u8) MacAddrHi;
BufferPtr[2] = (u8) (MacAddrLo >> 24);
BufferPtr[3] = (u8) (MacAddrLo >> 16);
BufferPtr[4] = (u8) (MacAddrLo >> 8);
BufferPtr[5] = (u8) MacAddrLo;
}
/******************************************************************************/
/**
*
* Configure DMA capabilities.
*
* @param InstancePtr is a pointer to the XEmac instance to be worked on.
*
* @return
*
* - XST_SUCCESS if successful initialization of DMA
*
* @note
*
* None.
*
******************************************************************************/
static XStatus
ConfigureDma(XEmac * InstancePtr)
{
XStatus Result;
/*
* Initialize the DMA channels with their base addresses. We assume
* scatter-gather DMA is the only possible configuration. Descriptor space
* will need to be set later by the upper layer.
*/
Result = XDmaChannel_Initialize(&InstancePtr->RecvChannel,
InstancePtr->BaseAddress +
XEM_DMA_RECV_OFFSET);
if (Result != XST_SUCCESS) {
return Result;
}
Result = XDmaChannel_Initialize(&InstancePtr->SendChannel,
InstancePtr->BaseAddress +
XEM_DMA_SEND_OFFSET);
return Result;
}
/******************************************************************************/
/**
*
* Configure the send and receive FIFO components with their base addresses
* and interrupt masks. Currently the base addresses are defined constants.
*
* @param InstancePtr is a pointer to the XEmac instance to be worked on.
*
* @return
*
* XST_SUCCESS if successful initialization of the packet FIFOs
*
* @note
*
* None.
*
******************************************************************************/
static XStatus
ConfigureFifo(XEmac * InstancePtr)
{
XStatus Result;
/*
* Return status from the packet FIFOs initialization is ignored since
* they always return success.
*/
Result = XPacketFifoV100b_Initialize(&InstancePtr->RecvFifo,
InstancePtr->BaseAddress +
XEM_PFIFO_RXREG_OFFSET,
InstancePtr->BaseAddress +
XEM_PFIFO_RXDATA_OFFSET);
if (Result != XST_SUCCESS) {
return Result;
}
Result = XPacketFifoV100b_Initialize(&InstancePtr->SendFifo,
InstancePtr->BaseAddress +
XEM_PFIFO_TXREG_OFFSET,
InstancePtr->BaseAddress +
XEM_PFIFO_TXDATA_OFFSET);
return Result;
}
/******************************************************************************/
/**
*
* This is a stub for the scatter-gather send and recv callbacks. The stub
* is here in case the upper layers forget to set the handlers.
*
* @param CallBackRef is a pointer to the upper layer callback reference
* @param BdPtr is a pointer to the first buffer descriptor in a list
* @param NumBds is the number of descriptors in the list.
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
static void
StubSgHandler(void *CallBackRef, XBufDescriptor * BdPtr, u32 NumBds)
{
XASSERT_VOID_ALWAYS();
}
/******************************************************************************/
/**
*
* This is a stub for the non-DMA send and recv callbacks. The stub is here in
* case the upper layers forget to set the handlers.
*
* @param CallBackRef is a pointer to the upper layer callback reference
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
static void
StubFifoHandler(void *CallBackRef)
{
XASSERT_VOID_ALWAYS();
}
/******************************************************************************/
/**
*
* This is a stub for the asynchronous error callback. The stub is here in
* case the upper layers forget to set the handler.
*
* @param CallBackRef is a pointer to the upper layer callback reference
* @param ErrorCode is the Xilinx error code, indicating the cause of the error
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
static void
StubErrorHandler(void *CallBackRef, XStatus ErrorCode)
{
XASSERT_VOID_ALWAYS();
}
/*****************************************************************************/
/**
*
* Lookup the device configuration based on the unique device ID. The table
* EmacConfigTable contains the configuration info for each device in the system.
*
* @param DeviceId is the unique device ID of the device being looked up.
*
* @return
*
* A pointer to the configuration table entry corresponding to the given
* device ID, or NULL if no match is found.
*
* @note
*
* None.
*
******************************************************************************/
XEmac_Config *
XEmac_LookupConfig(u16 DeviceId)
{
XEmac_Config *CfgPtr = NULL;
int i;
for (i = 0; i < XPAR_XEMAC_NUM_INSTANCES; i++) {
if (XEmac_ConfigTable[i].DeviceId == DeviceId) {
CfgPtr = &XEmac_ConfigTable[i];
break;
}
}
return CfgPtr;
}
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