/*
* This optional function does a "fast" set of critical region protection to the
* value specified by pval. See the documentation for sys_arch_protect() for
* more information. This function is only required if your port is supporting
* an operating system.
*/
void
sys_arch_unprotect(sys_prot_t lev)
{
#ifdef __arm__
#ifdef PEEP
EmacEnableIntr();
#else
mtcpsr(lev);
#endif
#else
mtmsr(lev);
#endif
}
XStatus init_dma(xemacpsif_s *xemacpsif)
{
NetworkBufferDescriptor_t *pxBuffer;
int iIndex;
UBaseType_t xRxSize;
UBaseType_t xTxSize;
struct xtopology_t *xtopologyp = &xXTopology;
xRxSize = ipconfigNIC_N_RX_DESC * sizeof( xemacpsif->rxSegments[ 0 ] );
xTxSize = ipconfigNIC_N_TX_DESC * sizeof( xemacpsif->txSegments[ 0 ] );
/* Also round-up to 4KB */
xemacpsif->uTxUnitSize = ( ipTOTAL_ETHERNET_FRAME_SIZE + 0x1000ul ) & ~0xffful;
/*
* We allocate 65536 bytes for RX BDs which can accommodate a
* maximum of 8192 BDs which is much more than any application
* will ever need.
*/
xemacpsif->rxSegments = ( struct xBD_TYPE * )( pucGetUncachedMemory ( xRxSize ) );
xemacpsif->txSegments = ( struct xBD_TYPE * )( pucGetUncachedMemory ( xTxSize ) );
xemacpsif->tx_space = ( unsigned char * )( pucGetUncachedMemory ( ipconfigNIC_N_TX_DESC * xemacpsif->uTxUnitSize ) );
/* These variables will be used in XEmacPs_Start (see src/xemacps.c). */
xemacpsif->emacps.RxBdRing.BaseBdAddr = ( uint32_t ) xemacpsif->rxSegments;
xemacpsif->emacps.TxBdRing.BaseBdAddr = ( uint32_t ) xemacpsif->txSegments;
/*
* Allocate RX descriptors, 1 RxBD at a time.
*/
for( iIndex = 0; iIndex < ipconfigNIC_N_RX_DESC; iIndex++ )
{
pxBuffer = pxDMA_rx_buffers[ iIndex ];
if( pxBuffer == NULL )
{
pxBuffer = pxGetNetworkBufferWithDescriptor( ipTOTAL_ETHERNET_FRAME_SIZE, ( TickType_t ) 0 );
if( pxBuffer == NULL )
{
FreeRTOS_printf( ("Unable to allocate a network buffer in recv_handler\n" ) );
return -1;
}
}
xemacpsif->rxSegments[ iIndex ].flags = 0;
xemacpsif->rxSegments[ iIndex ].address = ( ( uint32_t )pxBuffer->pucEthernetBuffer ) & XEMACPS_RXBUF_ADD_MASK;
pxDMA_rx_buffers[ iIndex ] = pxBuffer;
/* Make sure this memory is not in cache for now. */
if( ucIsCachedMemory( pxBuffer->pucEthernetBuffer ) != 0 )
{
Xil_DCacheInvalidateRange( ( ( uint32_t )pxBuffer->pucEthernetBuffer ) - ipconfigPACKET_FILLER_SIZE,
(unsigned)ipTOTAL_ETHERNET_FRAME_SIZE );
}
}
xemacpsif->rxSegments[ ipconfigNIC_N_RX_DESC - 1 ].address |= XEMACPS_RXBUF_WRAP_MASK;
memset( xemacpsif->tx_space, '\0', ipconfigNIC_N_TX_DESC * xemacpsif->uTxUnitSize );
clean_dma_txdescs( xemacpsif );
{
uint32_t value;
value = XEmacPs_ReadReg( xemacpsif->emacps.Config.BaseAddress, XEMACPS_DMACR_OFFSET );
// 1xxxx: Attempt to use INCR16 AHB bursts
value = ( value & ~( XEMACPS_DMACR_BLENGTH_MASK ) ) | XEMACPS_DMACR_INCR16_AHB_BURST;
#if( ipconfigDRIVER_INCLUDED_TX_IP_CHECKSUM != 0 )
value |= XEMACPS_DMACR_TCPCKSUM_MASK;
#else
#warning Are you sure the EMAC should not calculate outgoing checksums?
value &= ~XEMACPS_DMACR_TCPCKSUM_MASK;
#endif
XEmacPs_WriteReg( xemacpsif->emacps.Config.BaseAddress, XEMACPS_DMACR_OFFSET, value );
}
{
uint32_t value;
value = XEmacPs_ReadReg( xemacpsif->emacps.Config.BaseAddress, XEMACPS_NWCFG_OFFSET );
/* Network buffers are 32-bit aligned + 2 bytes (because ipconfigPACKET_FILLER_SIZE = 2 ).
Now tell the EMAC that received messages should be stored at "address + 2". */
value = ( value & ~XEMACPS_NWCFG_RXOFFS_MASK ) | 0x8000;
#if( ipconfigDRIVER_INCLUDED_RX_IP_CHECKSUM != 0 )
value |= XEMACPS_NWCFG_RXCHKSUMEN_MASK;
#else
#warning Are you sure the EMAC should not calculate incoming checksums?
value &= ~XEMACPS_NWCFG_RXCHKSUMEN_MASK;
#endif
XEmacPs_WriteReg( xemacpsif->emacps.Config.BaseAddress, XEMACPS_NWCFG_OFFSET, value );
}
/*
* Connect the device driver handler that will be called when an
* interrupt for the device occurs, the handler defined above performs
* the specific interrupt processing for the device.
*/
XScuGic_RegisterHandler(INTC_BASE_ADDR, xtopologyp->scugic_emac_intr,
(Xil_ExceptionHandler)XEmacPs_IntrHandler,
(void *)&xemacpsif->emacps);
/*
* Enable the interrupt for emacps.
*/
EmacEnableIntr( );
return 0;
}
