diff options
Diffstat (limited to 'board/xilinx/xilinx_enet/xemac.c')
| -rw-r--r-- | board/xilinx/xilinx_enet/xemac.c | 844 |
1 files changed, 844 insertions, 0 deletions
diff --git a/board/xilinx/xilinx_enet/xemac.c b/board/xilinx/xilinx_enet/xemac.c new file mode 100644 index 0000000..48b4ede --- /dev/null +++ b/board/xilinx/xilinx_enet/xemac.c @@ -0,0 +1,844 @@ +/****************************************************************************** +* +* 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; +} |