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df482650 SL |
1 | /* |
2 | * Xilinx xps_ll_temac ethernet driver for u-boot | |
3 | * | |
4 | * FIFO sub-controller | |
5 | * | |
6 | * Copyright (C) 2011 - 2012 Stephan Linz <linz@li-pro.net> | |
7 | * Copyright (C) 2008 - 2011 Michal Simek <monstr@monstr.eu> | |
8 | * Copyright (C) 2008 - 2011 PetaLogix | |
9 | * | |
10 | * Based on Yoshio Kashiwagi kashiwagi@co-nss.co.jp driver | |
11 | * Copyright (C) 2008 Nissin Systems Co.,Ltd. | |
12 | * March 2008 created | |
13 | * | |
14 | * CREDITS: tsec driver | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify it | |
17 | * under the terms of the GNU General Public License as published by the | |
18 | * Free Software Foundation; either version 2 of the License, or (at your | |
19 | * option) any later version. | |
20 | * | |
21 | * [0]: http://www.xilinx.com/support/documentation | |
22 | * | |
23 | * [F]: [0]/ip_documentation/xps_ll_fifo.pdf | |
24 | * [S]: [0]/ip_documentation/xps_ll_temac.pdf | |
25 | * [A]: [0]/application_notes/xapp1041.pdf | |
26 | */ | |
27 | ||
28 | #include <config.h> | |
29 | #include <common.h> | |
30 | #include <net.h> | |
31 | ||
32 | #include <asm/types.h> | |
33 | #include <asm/io.h> | |
34 | ||
35 | #include "xilinx_ll_temac.h" | |
36 | #include "xilinx_ll_temac_fifo.h" | |
37 | ||
38 | int ll_temac_reset_fifo(struct eth_device *dev) | |
39 | { | |
40 | struct ll_temac *ll_temac = dev->priv; | |
41 | struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; | |
42 | ||
43 | out_be32(&fifo_ctrl->tdfr, LL_FIFO_TDFR_KEY); | |
44 | out_be32(&fifo_ctrl->rdfr, LL_FIFO_RDFR_KEY); | |
45 | out_be32(&fifo_ctrl->isr, ~0UL); | |
46 | out_be32(&fifo_ctrl->ier, 0); | |
47 | ||
48 | return 0; | |
49 | } | |
50 | ||
51 | int ll_temac_recv_fifo(struct eth_device *dev) | |
52 | { | |
53 | int i, length = 0; | |
54 | u32 *buf = (u32 *)NetRxPackets[0]; | |
55 | struct ll_temac *ll_temac = dev->priv; | |
56 | struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; | |
57 | ||
58 | if (in_be32(&fifo_ctrl->isr) & LL_FIFO_ISR_RC) { | |
59 | ||
60 | /* reset isr */ | |
61 | out_be32(&fifo_ctrl->isr, ~0UL); | |
62 | ||
63 | /* | |
64 | * MAYBE here: | |
65 | * while (fifo_ctrl->isr); | |
66 | */ | |
67 | ||
68 | /* | |
69 | * The length is written (into RLR) by the XPS LL FIFO | |
70 | * when the packet is received across the RX LocalLink | |
71 | * interface and the receive data FIFO had enough | |
72 | * locations that all of the packet data has been saved. | |
73 | * The RLR should only be read when a receive packet is | |
74 | * available for processing (the receive occupancy is | |
75 | * not zero). Once the RLR is read, the receive packet | |
76 | * data should be read from the receive data FIFO before | |
77 | * the RLR is read again. | |
78 | * | |
79 | * [F] page 17, Receive Length Register (RLR) | |
80 | */ | |
81 | if (in_be32(&fifo_ctrl->rdfo) & LL_FIFO_RDFO_MASK) { | |
82 | length = in_be32(&fifo_ctrl->rlf) & LL_FIFO_RLF_MASK; | |
83 | } else { | |
84 | printf("%s: Got error, no receive occupancy\n", | |
85 | __func__); | |
86 | return -1; | |
87 | } | |
88 | ||
89 | if (length > PKTSIZE_ALIGN) { | |
90 | printf("%s: Got error, receive package too big (%i)\n", | |
91 | __func__, length); | |
92 | ll_temac_reset_fifo(dev); | |
93 | return -1; | |
94 | } | |
95 | ||
96 | for (i = 0; i < length; i += 4) | |
97 | *buf++ = in_be32(&fifo_ctrl->rdfd); | |
98 | ||
99 | NetReceive(NetRxPackets[0], length); | |
100 | } | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
f22ff1ab | 105 | int ll_temac_send_fifo(struct eth_device *dev, void *packet, int length) |
df482650 SL |
106 | { |
107 | int i; | |
108 | u32 *buf = (u32 *)packet; | |
109 | struct ll_temac *ll_temac = dev->priv; | |
110 | struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; | |
111 | ||
112 | if (length < LL_FIFO_TLF_MIN) { | |
113 | printf("%s: Got error, transmit package too small (%i)\n", | |
114 | __func__, length); | |
115 | return -1; | |
116 | } | |
117 | ||
118 | if (length > LL_FIFO_TLF_MAX) { | |
119 | printf("%s: Got error, transmit package too big (%i)\n", | |
120 | __func__, length); | |
121 | return -1; | |
122 | } | |
123 | ||
124 | for (i = 0; i < length; i += 4) | |
125 | out_be32(&fifo_ctrl->tdfd, *buf++); | |
126 | ||
127 | /* | |
128 | * Once the packet length is written to the TLR it is | |
129 | * automatically moved to the transmit data FIFO with | |
130 | * the packet data freeing up the TLR for another value. | |
131 | * The packet length must be written to the TLR after | |
132 | * the packet data is written to the transmit data FIFO. | |
133 | * It is not valid to write data for multiple packets | |
134 | * to the transmit data FIFO before writing the packet | |
135 | * length values. | |
136 | * | |
137 | * [F] page 17, Transmit Length Register (TLR) | |
138 | */ | |
139 | out_be32(&fifo_ctrl->tlf, length); | |
140 | ||
141 | return 0; | |
142 | } |