2 FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.
\r
4 This file is part of the FreeRTOS distribution.
\r
6 FreeRTOS is free software; you can redistribute it and/or modify it under
\r
7 the terms of the GNU General Public License (version 2) as published by the
\r
8 Free Software Foundation and modified by the FreeRTOS exception.
\r
9 **NOTE** The exception to the GPL is included to allow you to distribute a
\r
10 combined work that includes FreeRTOS without being obliged to provide the
\r
11 source code for proprietary components outside of the FreeRTOS kernel.
\r
12 Alternative commercial license and support terms are also available upon
\r
13 request. See the licensing section of http://www.FreeRTOS.org for full
\r
16 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
\r
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
\r
18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
\r
21 You should have received a copy of the GNU General Public License along
\r
22 with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
\r
23 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
\r
26 ***************************************************************************
\r
28 * The FreeRTOS eBook and reference manual are available to purchase for a *
\r
29 * small fee. Help yourself get started quickly while also helping the *
\r
30 * FreeRTOS project! See http://www.FreeRTOS.org/Documentation for details *
\r
32 ***************************************************************************
\r
36 Please ensure to read the configuration and relevant port sections of the
\r
37 online documentation.
\r
39 http://www.FreeRTOS.org - Documentation, latest information, license and
\r
42 http://www.SafeRTOS.com - A version that is certified for use in safety
\r
45 http://www.OpenRTOS.com - Commercial support, development, porting,
\r
46 licensing and training services.
\r
50 * Interrupt driven driver for the EMAC peripheral. This driver is not
\r
51 * reentrant, re-entrancy is handled by a semaphore at the network interface
\r
59 + Corrected the byte order when writing the MAC address to the MAC.
\r
60 + Support added for MII interfaces. Previously only RMII was supported.
\r
64 + The MII interface is now the default.
\r
65 + Modified the initialisation sequence slightly to allow auto init more
\r
70 + Made the function vClearEMACTxBuffer() more robust by moving the index
\r
71 manipulation into the if() statement. This allows the tx interrupt to
\r
72 execute even when there is no data to handle.
\r
76 + Corrected the Rx frame length mask when obtaining the length from the
\r
81 /* Standard includes. */
\r
84 /* Scheduler includes. */
\r
85 #include "FreeRTOS.h"
\r
89 /* Demo app includes. */
\r
90 #include "SAM7_EMAC.h"
\r
92 /* Hardware specific includes. */
\r
95 #include "AT91SAM7X256.h"
\r
98 /* USE_RMII_INTERFACE must be defined as 1 to use an RMII interface, or 0
\r
99 to use an MII interface. */
\r
100 #define USE_RMII_INTERFACE 0
\r
103 /* The buffer addresses written into the descriptors must be aligned so the
\r
104 last few bits are zero. These bits have special meaning for the EMAC
\r
105 peripheral and cannot be used as part of the address. */
\r
106 #define emacADDRESS_MASK ( ( unsigned long ) 0xFFFFFFFC )
\r
108 /* Bit used within the address stored in the descriptor to mark the last
\r
109 descriptor in the array. */
\r
110 #define emacRX_WRAP_BIT ( ( unsigned long ) 0x02 )
\r
112 /* Bit used within the Tx descriptor status to indicate whether the
\r
113 descriptor is under the control of the EMAC or the software. */
\r
114 #define emacTX_BUF_USED ( ( unsigned long ) 0x80000000 )
\r
116 /* A short delay is used to wait for a buffer to become available, should
\r
117 one not be immediately available when trying to transmit a frame. */
\r
118 #define emacBUFFER_WAIT_DELAY ( 2 )
\r
119 #define emacMAX_WAIT_CYCLES ( ( portBASE_TYPE ) ( configTICK_RATE_HZ / 40 ) )
\r
121 /* The time to block waiting for input. */
\r
122 #define emacBLOCK_TIME_WAITING_FOR_INPUT ( ( portTickType ) 100 )
\r
124 /* Peripheral setup for the EMAC. */
\r
125 #define emacPERIPHERAL_A_SETUP ( ( unsigned long ) AT91C_PB2_ETX0 ) | \
\r
126 ( ( unsigned long ) AT91C_PB12_ETXER ) | \
\r
127 ( ( unsigned long ) AT91C_PB16_ECOL ) | \
\r
128 ( ( unsigned long ) AT91C_PB11_ETX3 ) | \
\r
129 ( ( unsigned long ) AT91C_PB6_ERX1 ) | \
\r
130 ( ( unsigned long ) AT91C_PB15_ERXDV ) | \
\r
131 ( ( unsigned long ) AT91C_PB13_ERX2 ) | \
\r
132 ( ( unsigned long ) AT91C_PB3_ETX1 ) | \
\r
133 ( ( unsigned long ) AT91C_PB8_EMDC ) | \
\r
134 ( ( unsigned long ) AT91C_PB5_ERX0 ) | \
\r
135 ( ( unsigned long ) AT91C_PB14_ERX3 ) | \
\r
136 ( ( unsigned long ) AT91C_PB4_ECRS_ECRSDV ) | \
\r
137 ( ( unsigned long ) AT91C_PB1_ETXEN ) | \
\r
138 ( ( unsigned long ) AT91C_PB10_ETX2 ) | \
\r
139 ( ( unsigned long ) AT91C_PB0_ETXCK_EREFCK ) | \
\r
140 ( ( unsigned long ) AT91C_PB9_EMDIO ) | \
\r
141 ( ( unsigned long ) AT91C_PB7_ERXER ) | \
\r
142 ( ( unsigned long ) AT91C_PB17_ERXCK );
\r
144 /* Misc defines. */
\r
145 #define emacINTERRUPT_LEVEL ( 5 )
\r
146 #define emacNO_DELAY ( 0 )
\r
147 #define emacTOTAL_FRAME_HEADER_SIZE ( 54 )
\r
148 #define emacPHY_INIT_DELAY ( 5000 / portTICK_RATE_MS )
\r
149 #define emacRESET_KEY ( ( unsigned long ) 0xA5000000 )
\r
150 #define emacRESET_LENGTH ( ( unsigned long ) ( 0x01 << 8 ) )
\r
152 /* The Atmel header file only defines the TX frame length mask. */
\r
153 #define emacRX_LENGTH_FRAME ( 0xfff )
\r
155 /*-----------------------------------------------------------*/
\r
157 /* Buffer written to by the EMAC DMA. Must be aligned as described by the
\r
158 comment above the emacADDRESS_MASK definition. */
\r
159 static volatile char pcRxBuffer[ NB_RX_BUFFERS * ETH_RX_BUFFER_SIZE ] __attribute__ ((aligned (8)));
\r
161 /* Buffer read by the EMAC DMA. Must be aligned as described by the comment
\r
162 above the emacADDRESS_MASK definition. */
\r
163 static char pcTxBuffer[ NB_TX_BUFFERS * ETH_TX_BUFFER_SIZE ] __attribute__ ((aligned (8)));
\r
165 /* Descriptors used to communicate between the program and the EMAC peripheral.
\r
166 These descriptors hold the locations and state of the Rx and Tx buffers. */
\r
167 static volatile AT91S_TxTdDescriptor xTxDescriptors[ NB_TX_BUFFERS ];
\r
168 static volatile AT91S_RxTdDescriptor xRxDescriptors[ NB_RX_BUFFERS ];
\r
170 /* The IP and Ethernet addresses are read from the header files. */
\r
171 const char cMACAddress[ 6 ] = { emacETHADDR0, emacETHADDR1, emacETHADDR2, emacETHADDR3, emacETHADDR4, emacETHADDR5 };
\r
172 const unsigned char ucIPAddress[ 4 ] = { emacIPADDR0, emacIPADDR1, emacIPADDR2, emacIPADDR3 };
\r
174 /*-----------------------------------------------------------*/
\r
176 /* See the header file for descriptions of public functions. */
\r
179 * Prototype for the EMAC interrupt function.
\r
181 void vEMACISR_Wrapper( void ) __attribute__ ((naked));
\r
184 * Initialise both the Tx and Rx descriptors used by the EMAC.
\r
186 static void prvSetupDescriptors(void);
\r
189 * Write our MAC address into the EMAC.
\r
191 static void prvSetupMACAddress( void );
\r
194 * Configure the EMAC and AIC for EMAC interrupts.
\r
196 static void prvSetupEMACInterrupt( void );
\r
199 * Some initialisation functions taken from the Atmel EMAC sample code.
\r
201 static void vReadPHY( unsigned char ucPHYAddress, unsigned char ucAddress, unsigned long *pulValue );
\r
202 static portBASE_TYPE xGetLinkSpeed( void );
\r
203 static portBASE_TYPE prvProbePHY( void );
\r
204 #if USE_RMII_INTERFACE != 1
\r
205 static void vWritePHY( unsigned char ucPHYAddress, unsigned char ucAddress, unsigned long ulValue);
\r
209 /* The semaphore used by the EMAC ISR to wake the EMAC task. */
\r
210 static xSemaphoreHandle xSemaphore = NULL;
\r
212 /* Holds the index to the next buffer from which data will be read. */
\r
213 static volatile unsigned long ulNextRxBuffer = 0;
\r
215 /*-----------------------------------------------------------*/
\r
217 /* See the header file for descriptions of public functions. */
\r
218 long lEMACSend( char *pcFrom, unsigned long ulLength, long lEndOfFrame )
\r
220 static unsigned portBASE_TYPE uxTxBufferIndex = 0;
\r
221 portBASE_TYPE xWaitCycles = 0;
\r
222 long lReturn = pdPASS;
\r
224 unsigned long ulLastBuffer, ulDataBuffered = 0, ulDataRemainingToSend, ulLengthToSend;
\r
226 /* If the length of data to be transmitted is greater than each individual
\r
227 transmit buffer then the data will be split into more than one buffer.
\r
228 Loop until the entire length has been buffered. */
\r
229 while( ulDataBuffered < ulLength )
\r
231 /* Is a buffer available? */
\r
232 while( !( xTxDescriptors[ uxTxBufferIndex ].U_Status.status & AT91C_TRANSMIT_OK ) )
\r
234 /* There is no room to write the Tx data to the Tx buffer. Wait a
\r
235 short while, then try again. */
\r
237 if( xWaitCycles > emacMAX_WAIT_CYCLES )
\r
245 vTaskDelay( emacBUFFER_WAIT_DELAY );
\r
249 /* lReturn will only be pdPASS if a buffer is available. */
\r
250 if( lReturn == pdPASS )
\r
252 portENTER_CRITICAL();
\r
254 /* Get the address of the buffer from the descriptor, then copy
\r
255 the data into the buffer. */
\r
256 pcBuffer = ( char * ) xTxDescriptors[ uxTxBufferIndex ].addr;
\r
258 /* How much can we write to the buffer? */
\r
259 ulDataRemainingToSend = ulLength - ulDataBuffered;
\r
260 if( ulDataRemainingToSend <= ETH_TX_BUFFER_SIZE )
\r
262 /* We can write all the remaining bytes. */
\r
263 ulLengthToSend = ulDataRemainingToSend;
\r
267 /* We can not write more than ETH_TX_BUFFER_SIZE in one go. */
\r
268 ulLengthToSend = ETH_TX_BUFFER_SIZE;
\r
271 /* Copy the data into the buffer. */
\r
272 memcpy( ( void * ) pcBuffer, ( void * ) &( pcFrom[ ulDataBuffered ] ), ulLengthToSend );
\r
273 ulDataBuffered += ulLengthToSend;
\r
275 /* Is this the last data for the frame? */
\r
276 if( lEndOfFrame && ( ulDataBuffered >= ulLength ) )
\r
278 /* No more data remains for this frame so we can start the
\r
280 ulLastBuffer = AT91C_LAST_BUFFER;
\r
284 /* More data to come for this frame. */
\r
288 /* Fill out the necessary in the descriptor to get the data sent,
\r
289 then move to the next descriptor, wrapping if necessary. */
\r
290 if( uxTxBufferIndex >= ( NB_TX_BUFFERS - 1 ) )
\r
292 xTxDescriptors[ uxTxBufferIndex ].U_Status.status = ( ulLengthToSend & ( unsigned long ) AT91C_LENGTH_FRAME )
\r
294 | AT91C_TRANSMIT_WRAP;
\r
295 uxTxBufferIndex = 0;
\r
299 xTxDescriptors[ uxTxBufferIndex ].U_Status.status = ( ulLengthToSend & ( unsigned long ) AT91C_LENGTH_FRAME )
\r
304 /* If this is the last buffer to be sent for this frame we can
\r
305 start the transmission. */
\r
308 AT91C_BASE_EMAC->EMAC_NCR |= AT91C_EMAC_TSTART;
\r
311 portEXIT_CRITICAL();
\r
321 /*-----------------------------------------------------------*/
\r
323 /* See the header file for descriptions of public functions. */
\r
324 unsigned long ulEMACInputLength( void )
\r
326 register unsigned long ulIndex, ulLength = 0;
\r
328 /* Skip any fragments. We are looking for the first buffer that contains
\r
329 data and has the SOF (start of frame) bit set. */
\r
330 while( ( xRxDescriptors[ ulNextRxBuffer ].addr & AT91C_OWNERSHIP_BIT ) && !( xRxDescriptors[ ulNextRxBuffer ].U_Status.status & AT91C_SOF ) )
\r
332 /* Ignoring this buffer. Mark it as free again. */
\r
333 xRxDescriptors[ ulNextRxBuffer ].addr &= ~( AT91C_OWNERSHIP_BIT );
\r
335 if( ulNextRxBuffer >= NB_RX_BUFFERS )
\r
337 ulNextRxBuffer = 0;
\r
341 /* We are going to walk through the descriptors that make up this frame,
\r
342 but don't want to alter ulNextRxBuffer as this would prevent vEMACRead()
\r
343 from finding the data. Therefore use a copy of ulNextRxBuffer instead. */
\r
344 ulIndex = ulNextRxBuffer;
\r
346 /* Walk through the descriptors until we find the last buffer for this
\r
347 frame. The last buffer will give us the length of the entire frame. */
\r
348 while( ( xRxDescriptors[ ulIndex ].addr & AT91C_OWNERSHIP_BIT ) && !ulLength )
\r
350 ulLength = xRxDescriptors[ ulIndex ].U_Status.status & emacRX_LENGTH_FRAME;
\r
352 /* Increment to the next buffer, wrapping if necessary. */
\r
354 if( ulIndex >= NB_RX_BUFFERS )
\r
362 /*-----------------------------------------------------------*/
\r
364 /* See the header file for descriptions of public functions. */
\r
365 void vEMACRead( char *pcTo, unsigned long ulSectionLength, unsigned long ulTotalFrameLength )
\r
367 static unsigned long ulSectionBytesReadSoFar = 0, ulBufferPosition = 0, ulFameBytesReadSoFar = 0;
\r
368 static char *pcSource;
\r
369 register unsigned long ulBytesRemainingInBuffer, ulRemainingSectionBytes;
\r
371 /* Read ulSectionLength bytes from the Rx buffers. This is not necessarily any
\r
372 correspondence between the length of our Rx buffers, and the length of the
\r
373 data we are returning or the length of the data being requested. Therefore,
\r
374 between calls we have to remember not only which buffer we are currently
\r
375 processing, but our position within that buffer. This would be greatly
\r
376 simplified if PBUF_POOL_BUFSIZE could be guaranteed to be greater than
\r
377 the size of each Rx buffer, and that memory fragmentation did not occur.
\r
379 This function should only be called after a call to ulEMACInputLength().
\r
380 This will ensure ulNextRxBuffer is set to the correct buffer. */
\r
384 /* vEMACRead is called with pcTo set to NULL to indicate that we are about
\r
385 to read a new frame. Any fragments remaining in the frame we were
\r
386 processing during the last call should be dropped. */
\r
389 /* How many bytes are indicated as being in this buffer? If none then
\r
390 the buffer is completely full and the frame is contained within more
\r
391 than one buffer. */
\r
393 /* Reset our state variables ready for the next read from this buffer. */
\r
394 pcSource = ( char * )( xRxDescriptors[ ulNextRxBuffer ].addr & emacADDRESS_MASK );
\r
395 ulFameBytesReadSoFar = ( unsigned long ) 0;
\r
396 ulBufferPosition = ( unsigned long ) 0;
\r
400 /* Loop until we have obtained the required amount of data. */
\r
401 ulSectionBytesReadSoFar = 0;
\r
402 while( ulSectionBytesReadSoFar < ulSectionLength )
\r
404 /* We may have already read some data from this buffer. How much
\r
405 data remains in the buffer? */
\r
406 ulBytesRemainingInBuffer = ( ETH_RX_BUFFER_SIZE - ulBufferPosition );
\r
408 /* How many more bytes do we need to read before we have the
\r
409 required amount of data? */
\r
410 ulRemainingSectionBytes = ulSectionLength - ulSectionBytesReadSoFar;
\r
412 /* Do we want more data than remains in the buffer? */
\r
413 if( ulRemainingSectionBytes > ulBytesRemainingInBuffer )
\r
415 /* We want more data than remains in the buffer so we can
\r
416 write the remains of the buffer to the destination, then move
\r
417 onto the next buffer to get the rest. */
\r
418 memcpy( &( pcTo[ ulSectionBytesReadSoFar ] ), &( pcSource[ ulBufferPosition ] ), ulBytesRemainingInBuffer );
\r
419 ulSectionBytesReadSoFar += ulBytesRemainingInBuffer;
\r
420 ulFameBytesReadSoFar += ulBytesRemainingInBuffer;
\r
422 /* Mark the buffer as free again. */
\r
423 xRxDescriptors[ ulNextRxBuffer ].addr &= ~( AT91C_OWNERSHIP_BIT );
\r
425 /* Move onto the next buffer. */
\r
427 if( ulNextRxBuffer >= NB_RX_BUFFERS )
\r
429 ulNextRxBuffer = ( unsigned long ) 0;
\r
432 /* Reset the variables for the new buffer. */
\r
433 pcSource = ( char * )( xRxDescriptors[ ulNextRxBuffer ].addr & emacADDRESS_MASK );
\r
434 ulBufferPosition = ( unsigned long ) 0;
\r
438 /* We have enough data in this buffer to send back. Read out
\r
439 enough data and remember how far we read up to. */
\r
440 memcpy( &( pcTo[ ulSectionBytesReadSoFar ] ), &( pcSource[ ulBufferPosition ] ), ulRemainingSectionBytes );
\r
442 /* There may be more data in this buffer yet. Increment our
\r
443 position in this buffer past the data we have just read. */
\r
444 ulBufferPosition += ulRemainingSectionBytes;
\r
445 ulSectionBytesReadSoFar += ulRemainingSectionBytes;
\r
446 ulFameBytesReadSoFar += ulRemainingSectionBytes;
\r
448 /* Have we now finished with this buffer? */
\r
449 if( ( ulBufferPosition >= ETH_RX_BUFFER_SIZE ) || ( ulFameBytesReadSoFar >= ulTotalFrameLength ) )
\r
451 /* Mark the buffer as free again. */
\r
452 xRxDescriptors[ ulNextRxBuffer ].addr &= ~( AT91C_OWNERSHIP_BIT );
\r
454 /* Move onto the next buffer. */
\r
456 if( ulNextRxBuffer >= NB_RX_BUFFERS )
\r
458 ulNextRxBuffer = 0;
\r
461 pcSource = ( char * )( xRxDescriptors[ ulNextRxBuffer ].addr & emacADDRESS_MASK );
\r
462 ulBufferPosition = 0;
\r
468 /*-----------------------------------------------------------*/
\r
470 /* See the header file for descriptions of public functions. */
\r
471 xSemaphoreHandle xEMACInit( void )
\r
473 /* Code supplied by Atmel -------------------------------*/
\r
475 /* Disable pull up on RXDV => PHY normal mode (not in test mode),
\r
476 PHY has internal pull down. */
\r
477 AT91C_BASE_PIOB->PIO_PPUDR = 1 << 15;
\r
479 #if USE_RMII_INTERFACE != 1
\r
480 /* PHY has internal pull down : set MII mode. */
\r
481 AT91C_BASE_PIOB->PIO_PPUDR = 1 << 16;
\r
484 /* Clear PB18 <=> PHY powerdown. */
\r
485 AT91C_BASE_PIOB->PIO_PER = 1 << 18;
\r
486 AT91C_BASE_PIOB->PIO_OER = 1 << 18;
\r
487 AT91C_BASE_PIOB->PIO_CODR = 1 << 18;
\r
489 /* After PHY power up, hardware reset. */
\r
490 AT91C_BASE_RSTC->RSTC_RMR = emacRESET_KEY | emacRESET_LENGTH;
\r
491 AT91C_BASE_RSTC->RSTC_RCR = emacRESET_KEY | AT91C_RSTC_EXTRST;
\r
493 /* Wait for hardware reset end. */
\r
494 while( !( AT91C_BASE_RSTC->RSTC_RSR & AT91C_RSTC_NRSTL ) )
\r
496 __asm volatile ( "NOP" );
\r
498 __asm volatile ( "NOP" );
\r
500 /* Setup the pins. */
\r
501 AT91C_BASE_PIOB->PIO_ASR = emacPERIPHERAL_A_SETUP;
\r
502 AT91C_BASE_PIOB->PIO_PDR = emacPERIPHERAL_A_SETUP;
\r
504 /* Enable com between EMAC PHY.
\r
506 Enable management port. */
\r
507 AT91C_BASE_EMAC->EMAC_NCR |= AT91C_EMAC_MPE;
\r
509 /* MDC = MCK/32. */
\r
510 AT91C_BASE_EMAC->EMAC_NCFGR |= ( 2 ) << 10;
\r
512 /* Wait for PHY auto init end (rather crude delay!). */
\r
513 vTaskDelay( emacPHY_INIT_DELAY );
\r
515 /* PHY configuration. */
\r
516 #if USE_RMII_INTERFACE != 1
\r
518 unsigned long ulControl;
\r
520 /* PHY has internal pull down : disable MII isolate. */
\r
521 vReadPHY( AT91C_PHY_ADDR, MII_BMCR, &ulControl );
\r
522 vReadPHY( AT91C_PHY_ADDR, MII_BMCR, &ulControl );
\r
523 ulControl &= ~BMCR_ISOLATE;
\r
524 vWritePHY( AT91C_PHY_ADDR, MII_BMCR, ulControl );
\r
528 /* Disable management port again. */
\r
529 AT91C_BASE_EMAC->EMAC_NCR &= ~AT91C_EMAC_MPE;
\r
531 #if USE_RMII_INTERFACE != 1
\r
532 /* Enable EMAC in MII mode, enable clock ERXCK and ETXCK. */
\r
533 AT91C_BASE_EMAC->EMAC_USRIO = AT91C_EMAC_CLKEN ;
\r
535 /* Enable EMAC in RMII mode, enable RMII clock (50MHz from oscillator
\r
537 AT91C_BASE_EMAC->EMAC_USRIO = AT91C_EMAC_RMII | AT91C_EMAC_CLKEN ;
\r
540 /* End of code supplied by Atmel ------------------------*/
\r
542 /* Setup the buffers and descriptors. */
\r
543 prvSetupDescriptors();
\r
545 /* Load our MAC address into the EMAC. */
\r
546 prvSetupMACAddress();
\r
548 /* Are we connected? */
\r
549 if( prvProbePHY() )
\r
551 /* Enable the interrupt! */
\r
552 portENTER_CRITICAL();
\r
554 prvSetupEMACInterrupt();
\r
555 vPassEMACSemaphore( xSemaphore );
\r
557 portEXIT_CRITICAL();
\r
562 /*-----------------------------------------------------------*/
\r
564 /* See the header file for descriptions of public functions. */
\r
565 void vClearEMACTxBuffer( void )
\r
567 static unsigned portBASE_TYPE uxNextBufferToClear = 0;
\r
569 /* Called on Tx interrupt events to reset the AT91C_TRANSMIT_OK bit in each
\r
570 Tx buffer within the frame just transmitted. This marks all the buffers
\r
571 as available again.
\r
573 The first buffer in the frame should have the bit set automatically. */
\r
574 if( xTxDescriptors[ uxNextBufferToClear ].U_Status.status & AT91C_TRANSMIT_OK )
\r
576 /* Loop through the other buffers in the frame. */
\r
577 while( !( xTxDescriptors[ uxNextBufferToClear ].U_Status.status & AT91C_LAST_BUFFER ) )
\r
579 uxNextBufferToClear++;
\r
581 if( uxNextBufferToClear >= NB_TX_BUFFERS )
\r
583 uxNextBufferToClear = 0;
\r
586 xTxDescriptors[ uxNextBufferToClear ].U_Status.status |= AT91C_TRANSMIT_OK;
\r
589 /* Start with the next buffer the next time a Tx interrupt is called. */
\r
590 uxNextBufferToClear++;
\r
592 /* Do we need to wrap back to the first buffer? */
\r
593 if( uxNextBufferToClear >= NB_TX_BUFFERS )
\r
595 uxNextBufferToClear = 0;
\r
599 /*-----------------------------------------------------------*/
\r
601 static void prvSetupDescriptors(void)
\r
603 unsigned portBASE_TYPE xIndex;
\r
604 unsigned long ulAddress;
\r
606 /* Initialise xRxDescriptors descriptor. */
\r
607 for( xIndex = 0; xIndex < NB_RX_BUFFERS; ++xIndex )
\r
609 /* Calculate the address of the nth buffer within the array. */
\r
610 ulAddress = ( unsigned long )( pcRxBuffer + ( xIndex * ETH_RX_BUFFER_SIZE ) );
\r
612 /* Write the buffer address into the descriptor. The DMA will place
\r
613 the data at this address when this descriptor is being used. Mask off
\r
614 the bottom bits of the address as these have special meaning. */
\r
615 xRxDescriptors[ xIndex ].addr = ulAddress & emacADDRESS_MASK;
\r
618 /* The last buffer has the wrap bit set so the EMAC knows to wrap back
\r
619 to the first buffer. */
\r
620 xRxDescriptors[ NB_RX_BUFFERS - 1 ].addr |= emacRX_WRAP_BIT;
\r
622 /* Initialise xTxDescriptors. */
\r
623 for( xIndex = 0; xIndex < NB_TX_BUFFERS; ++xIndex )
\r
625 /* Calculate the address of the nth buffer within the array. */
\r
626 ulAddress = ( unsigned long )( pcTxBuffer + ( xIndex * ETH_TX_BUFFER_SIZE ) );
\r
628 /* Write the buffer address into the descriptor. The DMA will read
\r
629 data from here when the descriptor is being used. */
\r
630 xTxDescriptors[ xIndex ].addr = ulAddress & emacADDRESS_MASK;
\r
631 xTxDescriptors[ xIndex ].U_Status.status = AT91C_TRANSMIT_OK;
\r
634 /* The last buffer has the wrap bit set so the EMAC knows to wrap back
\r
635 to the first buffer. */
\r
636 xTxDescriptors[ NB_TX_BUFFERS - 1 ].U_Status.status = AT91C_TRANSMIT_WRAP | AT91C_TRANSMIT_OK;
\r
638 /* Tell the EMAC where to find the descriptors. */
\r
639 AT91C_BASE_EMAC->EMAC_RBQP = ( unsigned long ) xRxDescriptors;
\r
640 AT91C_BASE_EMAC->EMAC_TBQP = ( unsigned long ) xTxDescriptors;
\r
642 /* Clear all the bits in the receive status register. */
\r
643 AT91C_BASE_EMAC->EMAC_RSR = ( AT91C_EMAC_OVR | AT91C_EMAC_REC | AT91C_EMAC_BNA );
\r
645 /* Enable the copy of data into the buffers, ignore broadcasts,
\r
646 and don't copy FCS. */
\r
647 AT91C_BASE_EMAC->EMAC_NCFGR |= ( AT91C_EMAC_CAF | AT91C_EMAC_NBC | AT91C_EMAC_DRFCS);
\r
649 /* Enable Rx and Tx, plus the stats register. */
\r
650 AT91C_BASE_EMAC->EMAC_NCR |= ( AT91C_EMAC_TE | AT91C_EMAC_RE | AT91C_EMAC_WESTAT );
\r
652 /*-----------------------------------------------------------*/
\r
654 static void prvSetupMACAddress( void )
\r
656 /* Must be written SA1L then SA1H. */
\r
657 AT91C_BASE_EMAC->EMAC_SA1L = ( ( unsigned long ) cMACAddress[ 3 ] << 24 ) |
\r
658 ( ( unsigned long ) cMACAddress[ 2 ] << 16 ) |
\r
659 ( ( unsigned long ) cMACAddress[ 1 ] << 8 ) |
\r
662 AT91C_BASE_EMAC->EMAC_SA1H = ( ( unsigned long ) cMACAddress[ 5 ] << 8 ) |
\r
665 /*-----------------------------------------------------------*/
\r
667 static void prvSetupEMACInterrupt( void )
\r
669 /* Create the semaphore used to trigger the EMAC task. */
\r
670 vSemaphoreCreateBinary( xSemaphore );
\r
673 /* We start by 'taking' the semaphore so the ISR can 'give' it when the
\r
674 first interrupt occurs. */
\r
675 xSemaphoreTake( xSemaphore, emacNO_DELAY );
\r
676 portENTER_CRITICAL();
\r
678 /* We want to interrupt on Rx and Tx events. */
\r
679 AT91C_BASE_EMAC->EMAC_IER = AT91C_EMAC_RCOMP | AT91C_EMAC_TCOMP;
\r
681 /* Enable the interrupts in the AIC. */
\r
682 AT91F_AIC_ConfigureIt( AT91C_ID_EMAC, emacINTERRUPT_LEVEL, AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, ( void (*)( void ) ) vEMACISR_Wrapper );
\r
683 AT91C_BASE_AIC->AIC_IECR = 0x1 << AT91C_ID_EMAC;
\r
685 portEXIT_CRITICAL();
\r
694 * The following functions are initialisation functions taken from the Atmel
\r
695 * EMAC sample code.
\r
699 static portBASE_TYPE prvProbePHY( void )
\r
701 unsigned long ulPHYId1, ulPHYId2, ulStatus;
\r
702 portBASE_TYPE xReturn = pdPASS;
\r
704 /* Code supplied by Atmel (reformatted) -----------------*/
\r
706 /* Enable management port */
\r
707 AT91C_BASE_EMAC->EMAC_NCR |= AT91C_EMAC_MPE;
\r
708 AT91C_BASE_EMAC->EMAC_NCFGR |= ( 2 ) << 10;
\r
710 /* Read the PHY ID. */
\r
711 vReadPHY( AT91C_PHY_ADDR, MII_PHYSID1, &ulPHYId1 );
\r
712 vReadPHY(AT91C_PHY_ADDR, MII_PHYSID2, &ulPHYId2 );
\r
717 Bits 3:0 Revision Number Four bit manufacturer?s revision number.
\r
718 0001 stands for Rev. A, etc.
\r
720 if( ( ( ulPHYId1 << 16 ) | ( ulPHYId2 & 0xfff0 ) ) != MII_DM9161_ID )
\r
722 /* Did not expect this ID. */
\r
727 ulStatus = xGetLinkSpeed();
\r
729 if( ulStatus != pdPASS )
\r
735 /* Disable management port */
\r
736 AT91C_BASE_EMAC->EMAC_NCR &= ~AT91C_EMAC_MPE;
\r
738 /* End of code supplied by Atmel ------------------------*/
\r
742 /*-----------------------------------------------------------*/
\r
744 static void vReadPHY( unsigned char ucPHYAddress, unsigned char ucAddress, unsigned long *pulValue )
\r
746 /* Code supplied by Atmel (reformatted) ----------------------*/
\r
748 AT91C_BASE_EMAC->EMAC_MAN = (AT91C_EMAC_SOF & (0x01<<30))
\r
749 | (2 << 16) | (2 << 28)
\r
750 | ((ucPHYAddress & 0x1f) << 23)
\r
751 | (ucAddress << 18);
\r
753 /* Wait until IDLE bit in Network Status register is cleared. */
\r
754 while( !( AT91C_BASE_EMAC->EMAC_NSR & AT91C_EMAC_IDLE ) )
\r
759 *pulValue = ( AT91C_BASE_EMAC->EMAC_MAN & 0x0000ffff );
\r
761 /* End of code supplied by Atmel ------------------------*/
\r
763 /*-----------------------------------------------------------*/
\r
765 #if USE_RMII_INTERFACE != 1
\r
766 static void vWritePHY( unsigned char ucPHYAddress, unsigned char ucAddress, unsigned long ulValue )
\r
768 /* Code supplied by Atmel (reformatted) ----------------------*/
\r
770 AT91C_BASE_EMAC->EMAC_MAN = (( AT91C_EMAC_SOF & (0x01<<30))
\r
771 | (2 << 16) | (1 << 28)
\r
772 | ((ucPHYAddress & 0x1f) << 23)
\r
773 | (ucAddress << 18))
\r
774 | (ulValue & 0xffff);
\r
776 /* Wait until IDLE bit in Network Status register is cleared */
\r
777 while( !( AT91C_BASE_EMAC->EMAC_NSR & AT91C_EMAC_IDLE ) )
\r
782 /* End of code supplied by Atmel ------------------------*/
\r
785 /*-----------------------------------------------------------*/
\r
787 static portBASE_TYPE xGetLinkSpeed( void )
\r
789 unsigned long ulBMSR, ulBMCR, ulLPA, ulMACCfg, ulSpeed, ulDuplex;
\r
791 /* Code supplied by Atmel (reformatted) -----------------*/
\r
793 /* Link status is latched, so read twice to get current value */
\r
794 vReadPHY(AT91C_PHY_ADDR, MII_BMSR, &ulBMSR);
\r
795 vReadPHY(AT91C_PHY_ADDR, MII_BMSR, &ulBMSR);
\r
797 if( !( ulBMSR & BMSR_LSTATUS ) )
\r
803 vReadPHY(AT91C_PHY_ADDR, MII_BMCR, &ulBMCR);
\r
804 if (ulBMCR & BMCR_ANENABLE)
\r
806 /* AutoNegotiation is enabled. */
\r
807 if (!(ulBMSR & BMSR_ANEGCOMPLETE))
\r
809 /* Auto-negotitation in progress. */
\r
813 vReadPHY(AT91C_PHY_ADDR, MII_LPA, &ulLPA);
\r
814 if( ( ulLPA & LPA_100FULL ) || ( ulLPA & LPA_100HALF ) )
\r
816 ulSpeed = SPEED_100;
\r
820 ulSpeed = SPEED_10;
\r
823 if( ( ulLPA & LPA_100FULL ) || ( ulLPA & LPA_10FULL ) )
\r
825 ulDuplex = DUPLEX_FULL;
\r
829 ulDuplex = DUPLEX_HALF;
\r
834 ulSpeed = ( ulBMCR & BMCR_SPEED100 ) ? SPEED_100 : SPEED_10;
\r
835 ulDuplex = ( ulBMCR & BMCR_FULLDPLX ) ? DUPLEX_FULL : DUPLEX_HALF;
\r
838 /* Update the MAC */
\r
839 ulMACCfg = AT91C_BASE_EMAC->EMAC_NCFGR & ~( AT91C_EMAC_SPD | AT91C_EMAC_FD );
\r
840 if( ulSpeed == SPEED_100 )
\r
842 if( ulDuplex == DUPLEX_FULL )
\r
844 /* 100 Full Duplex */
\r
845 AT91C_BASE_EMAC->EMAC_NCFGR = ulMACCfg | AT91C_EMAC_SPD | AT91C_EMAC_FD;
\r
849 /* 100 Half Duplex */
\r
850 AT91C_BASE_EMAC->EMAC_NCFGR = ulMACCfg | AT91C_EMAC_SPD;
\r
855 if (ulDuplex == DUPLEX_FULL)
\r
857 /* 10 Full Duplex */
\r
858 AT91C_BASE_EMAC->EMAC_NCFGR = ulMACCfg | AT91C_EMAC_FD;
\r
861 { /* 10 Half Duplex */
\r
862 AT91C_BASE_EMAC->EMAC_NCFGR = ulMACCfg;
\r
866 /* End of code supplied by Atmel ------------------------*/
\r
870 /*-----------------------------------------------------------*/
\r
872 void vEMACWaitForInput( void )
\r
874 /* Just wait until we are signled from an ISR that data is available, or
\r
875 we simply time out. */
\r
876 xSemaphoreTake( xSemaphore, emacBLOCK_TIME_WAITING_FOR_INPUT );
\r