1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
4  *
5  * Copyright (C) 2004, 2005
6  * Cory T. Tusar, Videon Central, Inc., <ctusar@videon-central.com>
7  */
8 
9 #ifndef _EP93XX_ETH_H
10 #define _EP93XX_ETH_H
11 
12 #include <net.h>
13 
14 /**
15  * #define this to dump device status and queue info during initialization and
16  * following errors.
17  */
18 #undef EP93XX_MAC_DEBUG
19 
20 /**
21  * Number of descriptor and status entries in our RX queues.
22  * It must be power of 2 !
23  */
24 #define NUMRXDESC		PKTBUFSRX
25 
26 /**
27  * Number of descriptor and status entries in our TX queues.
28  */
29 #define NUMTXDESC		1
30 
31 /**
32  * 944 = (1024 - 64) - 16, Fifo size - Minframesize - 16 (Chip FACT)
33  */
34 #define TXSTARTMAX		944
35 
36 /**
37  * Receive descriptor queue entry
38  */
39 struct rx_descriptor {
40 	uint32_t word1;
41 	uint32_t word2;
42 };
43 
44 /**
45  * Receive status queue entry
46  */
47 struct rx_status {
48 	uint32_t word1;
49 	uint32_t word2;
50 };
51 
52 #define RX_STATUS_RWE(rx_status) ((rx_status->word1 >> 30) & 0x01)
53 #define RX_STATUS_RFP(rx_status) ((rx_status->word1 >> 31) & 0x01)
54 #define RX_STATUS_FRAME_LEN(rx_status) (rx_status->word2 & 0xFFFF)
55 
56 /**
57  * Transmit descriptor queue entry
58  */
59 struct tx_descriptor {
60 	uint32_t word1;
61 	uint32_t word2;
62 };
63 
64 #define TX_DESC_EOF (1 << 31)
65 
66 /**
67  * Transmit status queue entry
68  */
69 struct tx_status {
70 	uint32_t word1;
71 };
72 
73 #define TX_STATUS_TXWE(tx_status) (((tx_status)->word1 >> 30) & 0x01)
74 #define TX_STATUS_TXFP(tx_status) (((tx_status)->word1 >> 31) & 0x01)
75 
76 /**
77  * Transmit descriptor queue
78  */
79 struct tx_descriptor_queue {
80 	struct tx_descriptor *base;
81 	struct tx_descriptor *current;
82 	struct tx_descriptor *end;
83 };
84 
85 /**
86  * Transmit status queue
87  */
88 struct tx_status_queue {
89 	struct tx_status *base;
90 	volatile struct tx_status *current;
91 	struct tx_status *end;
92 };
93 
94 /**
95  * Receive descriptor queue
96  */
97 struct rx_descriptor_queue {
98 	struct rx_descriptor *base;
99 	struct rx_descriptor *current;
100 	struct rx_descriptor *end;
101 };
102 
103 /**
104  * Receive status queue
105  */
106 struct rx_status_queue {
107 	struct rx_status *base;
108 	volatile struct rx_status *current;
109 	struct rx_status *end;
110 };
111 
112 /**
113  * EP93xx MAC private data structure
114  */
115 struct ep93xx_priv {
116 	struct rx_descriptor_queue	rx_dq;
117 	struct rx_status_queue		rx_sq;
118 	void				*rx_buffer[NUMRXDESC];
119 
120 	struct tx_descriptor_queue	tx_dq;
121 	struct tx_status_queue		tx_sq;
122 
123 	struct mac_regs			*regs;
124 };
125 
126 #endif
127