2 * Network buffer code based on the MCF523x examples from Freescale.
4 * Freescale explicitly grants the redistribution and modification
5 * of these source files. The complete licensing information is
6 * available in the file LICENSE_FREESCALE.TXT.
8 * Modifications Copyright (c) 2006 Christian Walter <wolti@sil.at>
10 * File: $Id: nbuf.h,v 1.3 2006/09/24 22:50:23 wolti Exp $
16 /* ------------------------ Defines --------------------------------------- */
20 __attribute__((section(".nbuf"),aligned(16)))
26 /* We set the receiver buffers to the maximum size the FEC supports ( See
27 * MCF5235 reference manual 19.2.5.1.2 - Driver/DMA Operation with Receive
28 * BDs). This gives us the benefit that any frame fits into one buffer. A
29 * maximum size of 2047 is guaranteed by the FEC and 2048 is therefore a
31 * Note: The value MUST be dividable by 16!
33 #define RX_BUFFER_SIZE ( 2048 )
35 /* Size of the transmit buffers. If you set this value to small all frames
36 * greater than this size will be dropped. The value 1520 was choosen because
37 * it is bigger than the FEC MTU (1518) and is dividable by 16.
38 * Note: The value MUST be dividable by 16! */
39 #define TX_BUFFER_SIZE ( 1520 )
41 /* Number of Receive and Transmit Buffers and Buffer Descriptors */
42 #define NUM_RXBDS ( 2 )
43 #define NUM_TXBDS ( 2 )
45 /* ------------------------ Defines ( Buffer Descriptor Flags )------------ */
47 #define TX_BD_R ( 0x8000 )
48 #define TX_BD_INUSE ( 0x4000 )
49 #define TX_BD_TO1 ( 0x4000 )
50 #define TX_BD_W ( 0x2000 )
51 #define TX_BD_TO2 ( 0x1000 )
52 #define TX_BD_L ( 0x0800 )
53 #define TX_BD_TC ( 0x0400 )
54 #define TX_BD_DEF ( 0x0200 )
55 #define TX_BD_HB ( 0x0100 )
56 #define TX_BD_LC ( 0x0080 )
57 #define TX_BD_RL ( 0x0040 )
58 #define TX_BD_UN ( 0x0002 )
59 #define TX_BD_CSL ( 0x0001 )
61 #define RX_BD_E ( 0x8000 )
62 #define RX_BD_INUSE ( 0x4000 )
63 #define RX_BD_R01 ( 0x4000 )
64 #define RX_BD_W ( 0x2000 )
65 #define RX_BD_R02 ( 0x1000 )
66 #define RX_BD_L ( 0x0800 )
67 #define RX_BD_M ( 0x0100 )
68 #define RX_BD_BC ( 0x0080 )
69 #define RX_BD_MC ( 0x0040 )
70 #define RX_BD_LG ( 0x0020 )
71 #define RX_BD_NO ( 0x0010 )
72 #define RX_BD_SH ( 0x0008 )
73 #define RX_BD_CR ( 0x0004 )
74 #define RX_BD_OV ( 0x0002 )
75 #define RX_BD_TR ( 0x0001 )
77 /* ------------------------ Type definitions ------------------------------ */
80 uint16 status; /* control and status */
81 uint16 length; /* transfer length */
82 uint8 *data; /* buffer address */
85 /* ------------------------ Prototypes ------------------------------------ */
87 void nbuf_init( void );
88 uint32 nbuf_get_start( uint8 );
89 nbuf_t *nbuf_rx_allocate( void );
90 nbuf_t *nbuf_tx_allocate( void );
91 void nbuf_rx_release( nbuf_t * );
92 void nbuf_tx_release( nbuf_t * );
93 int nbuf_rx_next_ready( void );