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Richard Barry 2012-08-11 21:34:11 +00:00
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FreeRTOS/Demo/SuperH_SH7216_Renesas/RTOSDemo/webserver/EMAC.c Normal file
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/*
FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
***************************************************************************
* *
* FreeRTOS tutorial books are available in pdf and paperback. *
* Complete, revised, and edited pdf reference manuals are also *
* available. *
* *
* Purchasing FreeRTOS documentation will not only help you, by *
* ensuring you get running as quickly as possible and with an *
* in-depth knowledge of how to use FreeRTOS, it will also help *
* the FreeRTOS project to continue with its mission of providing *
* professional grade, cross platform, de facto standard solutions *
* for microcontrollers - completely free of charge! *
* *
* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
* *
* Thank you for using FreeRTOS, and thank you for your support! *
* *
***************************************************************************
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
>>>NOTE<<< The modification to the GPL is included to allow you to
distribute a combined work that includes FreeRTOS without being obliged to
provide the source code for proprietary components outside of the FreeRTOS
kernel. FreeRTOS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details. You should have received a copy of the GNU General Public
License and the FreeRTOS license exception along with FreeRTOS; if not it
can be viewed here: http://www.freertos.org/a00114.html and also obtained
by writing to Richard Barry, contact details for whom are available on the
FreeRTOS WEB site.
1 tab == 4 spaces!
***************************************************************************
* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong? *
* *
* http://www.FreeRTOS.org/FAQHelp.html *
* *
***************************************************************************
http://www.FreeRTOS.org - Documentation, training, latest information,
license and contact details.
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool.
Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
the code with commercial support, indemnification, and middleware, under
the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
provide a safety engineered and independently SIL3 certified version under
the SafeRTOS brand: http://www.SafeRTOS.com.
*/
/* Hardware specific includes. */
#include "iodefine.h"
#include "typedefine.h"
#include "hwEthernet.h"
#include "hwEthernetPhy.h"
/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"
/* uIP includes. */
#include "net/uip.h"
/* The time to wait between attempts to obtain a free buffer. */
#define emacBUFFER_WAIT_DELAY_ms ( 3 / portTICK_RATE_MS )
/* The number of times emacBUFFER_WAIT_DELAY_ms should be waited before giving
up on attempting to obtain a free buffer all together. */
#define emacBUFFER_WAIT_ATTEMPTS ( 30 )
/* The number of Rx descriptors. */
#define emacNUM_RX_DESCRIPTORS 3
/* The number of Tx descriptors. When using uIP there is not point in having
more than two. */
#define emacNUM_TX_BUFFERS 2
/* The total number of EMAC buffers to allocate. */
#define emacNUM_BUFFERS ( emacNUM_RX_DESCRIPTORS + emacNUM_TX_BUFFERS )
/* The time to wait for the Tx descriptor to become free. */
#define emacTX_WAIT_DELAY_ms ( 10 / portTICK_RATE_MS )
/* The total number of times to wait emacTX_WAIT_DELAY_ms for the Tx descriptor to
become free. */
#define emacTX_WAIT_ATTEMPTS ( 5 )
/* Only Rx end and Tx end interrupts are used by this driver. */
#define emacTX_END_INTERRUPT ( 1UL << 21UL )
#define emacRX_END_INTERRUPT ( 1UL << 18UL )
/*-----------------------------------------------------------*/
/* The buffers and descriptors themselves. */
#pragma section RX_DESCR
ethfifo xRxDescriptors[ emacNUM_RX_DESCRIPTORS ];
#pragma section TX_DESCR
ethfifo xTxDescriptors[ emacNUM_TX_BUFFERS ];
#pragma section _ETHERNET_BUFFERS
char xEthernetBuffers[ emacNUM_BUFFERS ][ UIP_BUFSIZE ];
#pragma section
/* Used to indicate which buffers are free and which are in use. If an index
contains 0 then the corresponding buffer in xEthernetBuffers is free, otherwise
the buffer is in use or about to be used. */
static unsigned char ucBufferInUse[ emacNUM_BUFFERS ];
/*-----------------------------------------------------------*/
/*
* Initialise both the Rx and Tx descriptors.
*/
static void prvInitialiseDescriptors( void );
/*
* Return a pointer to a free buffer within xEthernetBuffers.
*/
static unsigned char *prvGetNextBuffer( void );
/*
* Return a buffer to the list of free buffers.
*/
static void prvReturnBuffer( unsigned char *pucBuffer );
/*
* Examine the status of the next Rx FIFO to see if it contains new data.
*/
static unsigned long prvCheckRxFifoStatus( void );
/*
* Setup the microcontroller for communication with the PHY.
*/
static void prvSetupPortPinsAndReset( void );
/*
* Configure the Ethernet interface peripherals.
*/
static void prvConfigureEtherCAndEDMAC( void );
/*
* Something has gone wrong with the descriptor usage. Reset all the buffers
* and descriptors.
*/
static void prvResetEverything( void );
/*-----------------------------------------------------------*/
/* Points to the Rx descriptor currently in use. */
static ethfifo *xCurrentRxDesc = NULL;
/* The buffer used by the uIP stack to both receive and send. This points to
one of the Ethernet buffers when its actually in use. */
unsigned char *uip_buf = NULL;
/*-----------------------------------------------------------*/
void vInitEmac( void )
{
/* Setup the SH hardware for MII communications. */
prvSetupPortPinsAndReset();
/* Set the Rx and Tx descriptors into their initial state. */
prvInitialiseDescriptors();
/* Set the MAC address into the ETHERC */
EtherC.MAHR = ( ( unsigned long ) configMAC_ADDR0 << 24UL ) |
( ( unsigned long ) configMAC_ADDR1 << 16UL ) |
( ( unsigned long ) configMAC_ADDR2 << 8UL ) |
( unsigned long ) configMAC_ADDR3;
EtherC.MALR.BIT.MA = ( ( unsigned long ) configMAC_ADDR4 << 8UL ) |
( unsigned long ) configMAC_ADDR5;
/* Perform rest of interface hardware configuration. */
prvConfigureEtherCAndEDMAC();
/* Nothing received yet, so uip_buf points nowhere. */
uip_buf = NULL;
/* Initialize the PHY */
phyReset();
}
/*-----------------------------------------------------------*/
void vEMACWrite( void )
{
long x;
/* Wait until the second transmission of the last packet has completed. */
for( x = 0; x < emacTX_WAIT_ATTEMPTS; x++ )
{
if( ( xTxDescriptors[ 1 ].status & ACT ) != 0 )
{
/* Descriptor is still active. */
vTaskDelay( emacTX_WAIT_DELAY_ms );
}
else
{
break;
}
}
/* Is the descriptor free after waiting for it? */
if( ( xTxDescriptors[ 1 ].status & ACT ) != 0 )
{
/* Something has gone wrong. */
prvResetEverything();
}
/* Setup both descriptors to transmit the frame. */
xTxDescriptors[ 0 ].buf_p = ( char * ) uip_buf;
xTxDescriptors[ 0 ].bufsize = uip_len;
xTxDescriptors[ 1 ].buf_p = ( char * ) uip_buf;
xTxDescriptors[ 1 ].bufsize = uip_len;
/* uip_buf is being sent by the Tx descriptor. Allocate a new buffer
for use by the stack. */
uip_buf = prvGetNextBuffer();
/* Clear previous settings and go. */
xTxDescriptors[0].status &= ~( FP1 | FP0 );
xTxDescriptors[0].status |= ( FP1 | FP0 | ACT );
xTxDescriptors[1].status &= ~( FP1 | FP0 );
xTxDescriptors[1].status |= ( FP1 | FP0 | ACT );
EDMAC.EDTRR.LONG = 0x00000001;
}
/*-----------------------------------------------------------*/
unsigned long ulEMACRead( void )
{
unsigned long ulBytesReceived;
ulBytesReceived = prvCheckRxFifoStatus();
if( ulBytesReceived > 0 )
{
xCurrentRxDesc->status &= ~( FP1 | FP0 );
xCurrentRxDesc->status |= ACT;
if( EDMAC.EDRRR.LONG == 0x00000000L )
{
/* Restart Ethernet if it has stopped */
EDMAC.EDRRR.LONG = 0x00000001L;
}
/* Mark the pxDescriptor buffer as free as uip_buf is going to be set to
the buffer that contains the received data. */
prvReturnBuffer( uip_buf );
uip_buf = ( void * ) xCurrentRxDesc->buf_p;
/* Move onto the next buffer in the ring. */
xCurrentRxDesc = xCurrentRxDesc->next;
}
return ulBytesReceived;
}
/*-----------------------------------------------------------*/
long lEMACWaitForLink( void )
{
long lReturn;
/* Set the link status. */
switch( phyStatus() )
{
/* Half duplex link */
case PHY_LINK_100H:
case PHY_LINK_10H:
EtherC.ECMR.BIT.DM = 0;
lReturn = pdPASS;
break;
/* Full duplex link */
case PHY_LINK_100F:
case PHY_LINK_10F:
EtherC.ECMR.BIT.DM = 1;
lReturn = pdPASS;
break;
default:
lReturn = pdFAIL;
break;
}
if( lReturn == pdPASS )
{
/* Enable receive and transmit. */
EtherC.ECMR.BIT.RE = 1;
EtherC.ECMR.BIT.TE = 1;
/* Enable EDMAC receive */
EDMAC.EDRRR.LONG = 0x1;
}
return lReturn;
}
/*-----------------------------------------------------------*/
static void prvInitialiseDescriptors( void )
{
ethfifo *pxDescriptor;
long x;
for( x = 0; x < emacNUM_BUFFERS; x++ )
{
/* Ensure none of the buffers are shown as in use at the start. */
ucBufferInUse[ x ] = pdFALSE;
}
/* Initialise the Rx descriptors. */
for( x = 0; x < emacNUM_RX_DESCRIPTORS; x++ )
{
pxDescriptor = &( xRxDescriptors[ x ] );
pxDescriptor->buf_p = &( xEthernetBuffers[ x ][ 0 ] );
pxDescriptor->bufsize = UIP_BUFSIZE;
pxDescriptor->size = 0;
pxDescriptor->status = ACT;
pxDescriptor->next = &xRxDescriptors[ x + 1 ];
/* Mark this buffer as in use. */
ucBufferInUse[ x ] = pdTRUE;
}
/* The last descriptor points back to the start. */
pxDescriptor->status |= DL;
pxDescriptor->next = &xRxDescriptors[ 0 ];
/* Initialise the Tx descriptors. */
for( x = 0; x < emacNUM_TX_BUFFERS; x++ )
{
pxDescriptor = &( xTxDescriptors[ x ] );
/* A buffer is not allocated to the Tx descriptor until a send is
actually required. */
pxDescriptor->buf_p = NULL;
pxDescriptor->bufsize = UIP_BUFSIZE;
pxDescriptor->size = 0;
pxDescriptor->status = 0;
pxDescriptor->next = &xTxDescriptors[ x + 1 ];
}
/* The last descriptor points back to the start. */
pxDescriptor->status |= DL;
pxDescriptor->next = &( xTxDescriptors[ 0 ] );
/* Use the first Rx descriptor to start with. */
xCurrentRxDesc = &( xRxDescriptors[ 0 ] );
}
/*-----------------------------------------------------------*/
static unsigned char *prvGetNextBuffer( void )
{
long x;
unsigned char *pucReturn = NULL;
unsigned long ulAttempts = 0;
while( pucReturn == NULL )
{
/* Look through the buffers to find one that is not in use by
anything else. */
for( x = 0; x < emacNUM_BUFFERS; x++ )
{
if( ucBufferInUse[ x ] == pdFALSE )
{
ucBufferInUse[ x ] = pdTRUE;
pucReturn = ( unsigned char * ) &( xEthernetBuffers[ x ][ 0 ] );
break;
}
}
/* Was a buffer found? */
if( pucReturn == NULL )
{
ulAttempts++;
if( ulAttempts >= emacBUFFER_WAIT_ATTEMPTS )
{
break;
}
/* Wait then look again. */
vTaskDelay( emacBUFFER_WAIT_DELAY_ms );
}
}
return pucReturn;
}
/*-----------------------------------------------------------*/
static void prvReturnBuffer( unsigned char *pucBuffer )
{
unsigned long ul;
/* Return a buffer to the pool of free buffers. */
for( ul = 0; ul < emacNUM_BUFFERS; ul++ )
{
if( &( xEthernetBuffers[ ul ][ 0 ] ) == ( void * ) pucBuffer )
{
ucBufferInUse[ ul ] = pdFALSE;
break;
}
}
}
/*-----------------------------------------------------------*/
static void prvResetEverything( void )
{
/* Temporary code just to see if this gets called. This function has not
been implemented. */
portDISABLE_INTERRUPTS();
for( ;; );
}
/*-----------------------------------------------------------*/
static unsigned long prvCheckRxFifoStatus( void )
{
unsigned long ulReturn = 0;
if( ( xCurrentRxDesc->status & ACT ) != 0 )
{
/* Current descriptor is still active. */
}
else if( ( xCurrentRxDesc->status & FE ) != 0 )
{
/* Frame error. Clear the error. */
xCurrentRxDesc->status &= ~( FP1 | FP0 | FE );
xCurrentRxDesc->status &= ~( RMAF | RRF | RTLF | RTSF | PRE | CERF );
xCurrentRxDesc->status |= ACT;
xCurrentRxDesc = xCurrentRxDesc->next;
if( EDMAC.EDRRR.LONG == 0x00000000UL )
{
/* Restart Ethernet if it has stopped. */
EDMAC.EDRRR.LONG = 0x00000001UL;
}
}
else
{
/* The descriptor contains a frame. Because of the size of the buffers
the frame should always be complete. */
if( (xCurrentRxDesc->status & FP0) == FP0 )
{
ulReturn = xCurrentRxDesc->size;
}
else
{
/* Do not expect to get here. */
prvResetEverything();
}
}
return ulReturn;
}
/*-----------------------------------------------------------*/
static void prvSetupPortPinsAndReset( void )
{
/* Initialisation code taken from Renesas example project. */
PFC.PACRL4.BIT.PA12MD = 0x7; /* Set TX_CLK input (EtherC) */
PFC.PACRL3.BIT.PA11MD = 0x7; /* Set TX_EN output (EtherC) */
PFC.PACRL3.BIT.PA10MD = 0x7; /* Set MII_TXD0 output (EtherC) */
PFC.PACRL3.BIT.PA9MD = 0x7; /* Set MII_TXD1 output (EtherC) */
PFC.PACRL3.BIT.PA8MD = 0x7; /* Set MII_TXD2 output (EtherC) */
PFC.PACRL2.BIT.PA7MD = 0x7; /* Set MII_TXD3 output (EtherC) */
PFC.PACRL2.BIT.PA6MD = 0x7; /* Set TX_ER output (EtherC) */
PFC.PDCRH4.BIT.PD31MD = 0x7; /* Set RX_DV input (EtherC) */
PFC.PDCRH4.BIT.PD30MD = 0x7; /* Set RX_ER input (EtherC) */
PFC.PDCRH4.BIT.PD29MD = 0x7; /* Set MII_RXD3 input (EtherC) */
PFC.PDCRH4.BIT.PD28MD = 0x7; /* Set MII_RXD2 input (EtherC) */
PFC.PDCRH3.BIT.PD27MD = 0x7; /* Set MII_RXD1 input (EtherC) */
PFC.PDCRH3.BIT.PD26MD = 0x7; /* Set MII_RXD0 input (EtherC) */
PFC.PDCRH3.BIT.PD25MD = 0x7; /* Set RX_CLK input (EtherC) */
PFC.PDCRH3.BIT.PD24MD = 0x7; /* Set CRS input (EtherC) */
PFC.PDCRH2.BIT.PD23MD = 0x7; /* Set COL input (EtherC) */
PFC.PDCRH2.BIT.PD22MD = 0x7; /* Set WOL output (EtherC) */
PFC.PDCRH2.BIT.PD21MD = 0x7; /* Set EXOUT output (EtherC) */
PFC.PDCRH2.BIT.PD20MD = 0x7; /* Set MDC output (EtherC) */
PFC.PDCRH1.BIT.PD19MD = 0x7; /* Set LINKSTA input (EtherC) */
PFC.PDCRH1.BIT.PD18MD = 0x7; /* Set MDIO input/output (EtherC) */
STB.CR4.BIT._ETHER = 0x0;
EDMAC.EDMR.BIT.SWR = 1;
/* Crude wait for reset to complete. */
vTaskDelay( 500 / portTICK_RATE_MS );
}
/*-----------------------------------------------------------*/
static void prvConfigureEtherCAndEDMAC( void )
{
/* Initialisation code taken from Renesas example project. */
/* TODO: Check bit 5 */
EtherC.ECSR.LONG = 0x00000037; /* Clear all EtherC statuS BFR, PSRTO, LCHNG, MPD, ICD */
/* TODO: Check bit 5 */
EtherC.ECSIPR.LONG = 0x00000020; /* Disable EtherC status change interrupt */
EtherC.RFLR.LONG = 1518; /* Ether payload is 1500+ CRC */
EtherC.IPGR.LONG = 0x00000014; /* Intergap is 96-bit time */
/* EDMAC */
EDMAC.EESR.LONG = 0x47FF0F9F; /* Clear all EtherC and EDMAC status bits */
EDMAC.RDLAR = ( void * ) xCurrentRxDesc; /* Initialaize Rx Descriptor List Address */
EDMAC.TDLAR = &( xTxDescriptors[ 0 ] ); /* Initialaize Tx Descriptor List Address */
EDMAC.TRSCER.LONG = 0x00000000; /* Copy-back status is RFE & TFE only */
EDMAC.TFTR.LONG = 0x00000000; /* Threshold of Tx_FIFO */
EDMAC.FDR.LONG = 0x00000000; /* Transmit fifo & receive fifo is 256 bytes */
EDMAC.RMCR.LONG = 0x00000003; /* Receive function is normal mode(continued) */
/* Set the EDMAC interrupt priority - the interrupt priority must be
configKERNEL_INTERRUPT_PRIORITY no matter which peripheral is used to
generate the tick interrupt. */
INTC.IPR19.BIT._EDMAC = portKERNEL_INTERRUPT_PRIORITY;
EDMAC.EESIPR.LONG = emacTX_END_INTERRUPT | emacRX_END_INTERRUPT; /* Enable Rx and Tx end interrupts. */
/* Clear the interrupt flag. */
CMT0.CMCSR.BIT.CMF = 0;
}
/*-----------------------------------------------------------*/
void vEMAC_ISR_Handler( void )
{
unsigned long ul = EDMAC.EESR.LONG;
long lHigherPriorityTaskWoken = pdFALSE;
extern xSemaphoreHandle xEMACSemaphore;
static long ulTxEndInts = 0;
/* Has a Tx end occurred? */
if( ul & emacTX_END_INTERRUPT )
{
++ulTxEndInts;
if( ulTxEndInts >= 2 )
{
/* Only return the buffer to the pool once both Txes have completed. */
prvReturnBuffer( ( void * ) xTxDescriptors[ 0 ].buf_p );
ulTxEndInts = 0;
}
EDMAC.EESR.LONG = emacTX_END_INTERRUPT;
}
/* Has an Rx end occurred? */
if( ul & emacRX_END_INTERRUPT )
{
/* Make sure the Ethernet task is not blocked waiting for a packet. */
xSemaphoreGiveFromISR( xEMACSemaphore, &lHigherPriorityTaskWoken );
portYIELD_FROM_ISR( lHigherPriorityTaskWoken );
EDMAC.EESR.LONG = emacRX_END_INTERRUPT;
}
}