1 /*
2 * Agere Systems Inc.
3 * 10/100/1000 Base-T Ethernet Driver for the ET1301 and ET131x series MACs
4 *
5 * Copyright © 2005 Agere Systems Inc.
6 * All rights reserved.
7 * http://www.agere.com
8 *
9 *------------------------------------------------------------------------------
10 *
11 * et1310_tx.h - Defines, structs, enums, prototypes, etc. pertaining to data
12 * transmission.
13 *
14 *------------------------------------------------------------------------------
15 *
16 * SOFTWARE LICENSE
17 *
18 * This software is provided subject to the following terms and conditions,
19 * which you should read carefully before using the software. Using this
20 * software indicates your acceptance of these terms and conditions. If you do
21 * not agree with these terms and conditions, do not use the software.
22 *
23 * Copyright © 2005 Agere Systems Inc.
24 * All rights reserved.
25 *
26 * Redistribution and use in source or binary forms, with or without
27 * modifications, are permitted provided that the following conditions are met:
28 *
29 * . Redistributions of source code must retain the above copyright notice, this
30 * list of conditions and the following Disclaimer as comments in the code as
31 * well as in the documentation and/or other materials provided with the
32 * distribution.
33 *
34 * . Redistributions in binary form must reproduce the above copyright notice,
35 * this list of conditions and the following Disclaimer in the documentation
36 * and/or other materials provided with the distribution.
37 *
38 * . Neither the name of Agere Systems Inc. nor the names of the contributors
39 * may be used to endorse or promote products derived from this software
40 * without specific prior written permission.
41 *
42 * Disclaimer
43 *
44 * THIS SOFTWARE IS PROVIDED “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES,
45 * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
46 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. ANY
47 * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
48 * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
49 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
50 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
51 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
52 * ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
54 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
55 * DAMAGE.
56 *
57 */
58
59 #ifndef __ET1310_TX_H__
60 #define __ET1310_TX_H__
61
62
63 /* Typedefs for Tx Descriptor Ring */
64
65 /*
66 * TXDESC_WORD2_t structure holds part of the control bits in the Tx Descriptor
67 * ring for the ET-1310
68 */
69 typedef union _txdesc_word2_t {
70 u32 value;
71 struct {
72 #ifdef _BIT_FIELDS_HTOL
73 u32 vlan_prio:3; // bits 29-31(VLAN priority)
74 u32 vlan_cfi:1; // bit 28(cfi)
75 u32 vlan_tag:12; // bits 16-27(VLAN tag)
76 u32 length_in_bytes:16; // bits 0-15(packet length)
77 #else
78 u32 length_in_bytes:16; // bits 0-15(packet length)
79 u32 vlan_tag:12; // bits 16-27(VLAN tag)
80 u32 vlan_cfi:1; // bit 28(cfi)
81 u32 vlan_prio:3; // bits 29-31(VLAN priority)
82 #endif /* _BIT_FIELDS_HTOL */
83 } bits;
84 } TXDESC_WORD2_t, *PTXDESC_WORD2_t;
85
86 /*
87 * TXDESC_WORD3_t structure holds part of the control bits in the Tx Descriptor
88 * ring for the ET-1310
89 */
90 typedef union _txdesc_word3_t {
91 u32 value;
92 struct {
93 #ifdef _BIT_FIELDS_HTOL
94 u32 unused:17; // bits 15-31
95 u32 udpa:1; // bit 14(UDP checksum assist)
96 u32 tcpa:1; // bit 13(TCP checksum assist)
97 u32 ipa:1; // bit 12(IP checksum assist)
98 u32 vlan:1; // bit 11(append VLAN tag)
99 u32 hp:1; // bit 10(Packet is a Huge packet)
100 u32 pp:1; // bit 9(pad packet)
101 u32 mac:1; // bit 8(MAC override)
102 u32 crc:1; // bit 7(append CRC)
103 u32 e:1; // bit 6(Tx frame has error)
104 u32 pf:1; // bit 5(send pause frame)
105 u32 bp:1; // bit 4(Issue half-duplex backpressure (XON/XOFF)
106 u32 cw:1; // bit 3(Control word - no packet data)
107 u32 ir:1; // bit 2(interrupt the processor when this pkt sent)
108 u32 f:1; // bit 1(first packet in the sequence)
109 u32 l:1; // bit 0(last packet in the sequence)
110 #else
111 u32 l:1; // bit 0(last packet in the sequence)
112 u32 f:1; // bit 1(first packet in the sequence)
113 u32 ir:1; // bit 2(interrupt the processor when this pkt sent)
114 u32 cw:1; // bit 3(Control word - no packet data)
115 u32 bp:1; // bit 4(Issue half-duplex backpressure (XON/XOFF)
116 u32 pf:1; // bit 5(send pause frame)
117 u32 e:1; // bit 6(Tx frame has error)
118 u32 crc:1; // bit 7(append CRC)
119 u32 mac:1; // bit 8(MAC override)
120 u32 pp:1; // bit 9(pad packet)
121 u32 hp:1; // bit 10(Packet is a Huge packet)
122 u32 vlan:1; // bit 11(append VLAN tag)
123 u32 ipa:1; // bit 12(IP checksum assist)
124 u32 tcpa:1; // bit 13(TCP checksum assist)
125 u32 udpa:1; // bit 14(UDP checksum assist)
126 u32 unused:17; // bits 15-31
127 #endif /* _BIT_FIELDS_HTOL */
128 } bits;
129 } TXDESC_WORD3_t, *PTXDESC_WORD3_t;
130
131 /* TX_DESC_ENTRY_t is sructure representing each descriptor on the ring */
132 typedef struct _tx_desc_entry_t {
133 u32 DataBufferPtrHigh;
134 u32 DataBufferPtrLow;
135 TXDESC_WORD2_t word2; // control words how to xmit the
136 TXDESC_WORD3_t word3; // data (detailed above)
137 } TX_DESC_ENTRY_t, *PTX_DESC_ENTRY_t;
138
139
140 /* Typedefs for Tx DMA engine status writeback */
141
142 /*
143 * TX_STATUS_BLOCK_t is sructure representing the status of the Tx DMA engine
144 * it sits in free memory, and is pointed to by 0x101c / 0x1020
145 */
146 typedef union _tx_status_block_t {
147 u32 value;
148 struct {
149 #ifdef _BIT_FIELDS_HTOL
150 u32 unused:21; // bits 11-31
151 u32 serv_cpl_wrap:1; // bit 10
152 u32 serv_cpl:10; // bits 0-9
153 #else
154 u32 serv_cpl:10; // bits 0-9
155 u32 serv_cpl_wrap:1; // bit 10
156 u32 unused:21; // bits 11-31
157 #endif
158 } bits;
159 } TX_STATUS_BLOCK_t, *PTX_STATUS_BLOCK_t;
160
161 /* TCB (Transmit Control Block) */
162 typedef struct _MP_TCB {
163 struct _MP_TCB *Next;
164 u32 Flags;
165 u32 Count;
166 u32 PacketStaleCount;
167 struct sk_buff *Packet;
168 u32 PacketLength;
169 DMA10W_t WrIndex;
170 DMA10W_t WrIndexStart;
171 } MP_TCB, *PMP_TCB;
172
173 /* Structure to hold the skb's in a list */
174 typedef struct tx_skb_list_elem {
175 struct list_head skb_list_elem;
176 struct sk_buff *skb;
177 } TX_SKB_LIST_ELEM, *PTX_SKB_LIST_ELEM;
178
179 /* TX_RING_t is sructure representing our local reference(s) to the ring */
180 typedef struct _tx_ring_t {
181 /* TCB (Transmit Control Block) memory and lists */
182 PMP_TCB MpTcbMem;
183
184 /* List of TCBs that are ready to be used */
185 PMP_TCB TCBReadyQueueHead;
186 PMP_TCB TCBReadyQueueTail;
187
188 /* list of TCBs that are currently being sent. NOTE that access to all
189 * three of these (including nBusySend) are controlled via the
190 * TCBSendQLock. This lock should be secured prior to incementing /
191 * decrementing nBusySend, or any queue manipulation on CurrSendHead /
192 * Tail
193 */
194 PMP_TCB CurrSendHead;
195 PMP_TCB CurrSendTail;
196 int32_t nBusySend;
197
198 /* List of packets (not TCBs) that were queued for lack of resources */
199 struct list_head SendWaitQueue;
200 int32_t nWaitSend;
201
202 /* The actual descriptor ring */
203 PTX_DESC_ENTRY_t pTxDescRingVa;
204 dma_addr_t pTxDescRingPa;
205 uint64_t pTxDescRingAdjustedPa;
206 uint64_t TxDescOffset;
207
208 /* ReadyToSend indicates where we last wrote to in the descriptor ring. */
209 DMA10W_t txDmaReadyToSend;
210
211 /* The location of the write-back status block */
212 PTX_STATUS_BLOCK_t pTxStatusVa;
213 dma_addr_t pTxStatusPa;
214
215 /* A Block of zeroes used to pad packets that are less than 60 bytes */
216 void *pTxDummyBlkVa;
217 dma_addr_t pTxDummyBlkPa;
218
219 TXMAC_ERR_t TxMacErr;
220
221 /* Variables to track the Tx interrupt coalescing features */
222 int32_t TxPacketsSinceLastinterrupt;
223 } TX_RING_t, *PTX_RING_t;
224
225 /* Forward declaration of the frag-list for the following prototypes */
226 typedef struct _MP_FRAG_LIST MP_FRAG_LIST, *PMP_FRAG_LIST;
227
228 /* Forward declaration of the private adapter structure */
229 struct et131x_adapter;
230
231 /* PROTOTYPES for et1310_tx.c */
232 int et131x_tx_dma_memory_alloc(struct et131x_adapter *adapter);
233 void et131x_tx_dma_memory_free(struct et131x_adapter *adapter);
234 void ConfigTxDmaRegs(struct et131x_adapter *pAdapter);
235 void et131x_init_send(struct et131x_adapter *adapter);
236 void et131x_tx_dma_disable(struct et131x_adapter *pAdapter);
237 void et131x_tx_dma_enable(struct et131x_adapter *pAdapter);
238 void et131x_handle_send_interrupt(struct et131x_adapter *pAdapter);
239 void et131x_free_busy_send_packets(struct et131x_adapter *pAdapter);
240 int et131x_send_packets(struct sk_buff *skb, struct net_device *netdev);
241
242 #endif /* __ET1310_TX_H__ */
243
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