| /* | |
| * Network buffer code based on the MCF523x examples from Freescale. | |
| * | |
| * Freescale explicitly grants the redistribution and modification | |
| * of these source files. The complete licensing information is | |
| * available in the file LICENSE_FREESCALE.TXT. | |
| * | |
| * Modifications Copyright (c) 2006 Christian Walter <wolti@sil.at> | |
| * | |
| * File: $Id: nbuf.h,v 1.3 2006/09/24 22:50:23 wolti Exp $ | |
| */ | |
| #ifndef _NBUF_H | |
| #define _NBUF_H | |
| /* ------------------------ Defines --------------------------------------- */ | |
| #ifdef __GNUC__ | |
| #define ATTR_FECMEM \ | |
| __attribute__((section(".nbuf"),aligned(16))) | |
| #endif | |
| #define NBUF_RX ( 1 ) | |
| #define NBUF_TX ( 0 ) | |
| /* We set the receiver buffers to the maximum size the FEC supports ( See | |
| * MCF5235 reference manual 19.2.5.1.2 - Driver/DMA Operation with Receive | |
| * BDs). This gives us the benefit that any frame fits into one buffer. A | |
| * maximum size of 2047 is guaranteed by the FEC and 2048 is therefore a | |
| * safe value. | |
| * Note: The value MUST be dividable by 16! | |
| */ | |
| #define RX_BUFFER_SIZE ( 2048 ) | |
| /* Size of the transmit buffers. If you set this value to small all frames | |
| * greater than this size will be dropped. The value 1520 was choosen because | |
| * it is bigger than the FEC MTU (1518) and is dividable by 16. | |
| * Note: The value MUST be dividable by 16! */ | |
| #define TX_BUFFER_SIZE ( 1520 ) | |
| /* Number of Receive and Transmit Buffers and Buffer Descriptors */ | |
| #define NUM_RXBDS ( 2 ) | |
| #define NUM_TXBDS ( 2 ) | |
| /* ------------------------ Defines ( Buffer Descriptor Flags )------------ */ | |
| #define TX_BD_R ( 0x8000 ) | |
| #define TX_BD_INUSE ( 0x4000 ) | |
| #define TX_BD_TO1 ( 0x4000 ) | |
| #define TX_BD_W ( 0x2000 ) | |
| #define TX_BD_TO2 ( 0x1000 ) | |
| #define TX_BD_L ( 0x0800 ) | |
| #define TX_BD_TC ( 0x0400 ) | |
| #define TX_BD_DEF ( 0x0200 ) | |
| #define TX_BD_HB ( 0x0100 ) | |
| #define TX_BD_LC ( 0x0080 ) | |
| #define TX_BD_RL ( 0x0040 ) | |
| #define TX_BD_UN ( 0x0002 ) | |
| #define TX_BD_CSL ( 0x0001 ) | |
| #define RX_BD_E ( 0x8000 ) | |
| #define RX_BD_INUSE ( 0x4000 ) | |
| #define RX_BD_R01 ( 0x4000 ) | |
| #define RX_BD_W ( 0x2000 ) | |
| #define RX_BD_R02 ( 0x1000 ) | |
| #define RX_BD_L ( 0x0800 ) | |
| #define RX_BD_M ( 0x0100 ) | |
| #define RX_BD_BC ( 0x0080 ) | |
| #define RX_BD_MC ( 0x0040 ) | |
| #define RX_BD_LG ( 0x0020 ) | |
| #define RX_BD_NO ( 0x0010 ) | |
| #define RX_BD_SH ( 0x0008 ) | |
| #define RX_BD_CR ( 0x0004 ) | |
| #define RX_BD_OV ( 0x0002 ) | |
| #define RX_BD_TR ( 0x0001 ) | |
| /* ------------------------ Type definitions ------------------------------ */ | |
| typedef struct | |
| { | |
| uint16 status; /* control and status */ | |
| uint16 length; /* transfer length */ | |
| uint8 *data; /* buffer address */ | |
| } nbuf_t; | |
| /* ------------------------ Prototypes ------------------------------------ */ | |
| void nbuf_init( void ); | |
| uint32 nbuf_get_start( uint8 ); | |
| nbuf_t *nbuf_rx_allocate( void ); | |
| nbuf_t *nbuf_tx_allocate( void ); | |
| void nbuf_rx_release( nbuf_t * ); | |
| void nbuf_tx_release( nbuf_t * ); | |
| int nbuf_rx_next_ready( void ); | |
| #endif |