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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 | * | |
1a459660 | 16 | * SPDX-License-Identifier: GPL-2.0+ |
df482650 SL |
17 | * |
18 | * [0]: http://www.xilinx.com/support/documentation | |
19 | * | |
20 | * [F]: [0]/ip_documentation/xps_ll_fifo.pdf | |
21 | * [S]: [0]/ip_documentation/xps_ll_temac.pdf | |
22 | * [A]: [0]/application_notes/xapp1041.pdf | |
23 | */ | |
24 | ||
25 | #include <config.h> | |
26 | #include <common.h> | |
27 | #include <net.h> | |
28 | ||
29 | #include <asm/types.h> | |
30 | #include <asm/io.h> | |
31 | ||
32 | #include "xilinx_ll_temac.h" | |
33 | #include "xilinx_ll_temac_fifo.h" | |
34 | ||
35 | int ll_temac_reset_fifo(struct eth_device *dev) | |
36 | { | |
37 | struct ll_temac *ll_temac = dev->priv; | |
38 | struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; | |
39 | ||
40 | out_be32(&fifo_ctrl->tdfr, LL_FIFO_TDFR_KEY); | |
41 | out_be32(&fifo_ctrl->rdfr, LL_FIFO_RDFR_KEY); | |
42 | out_be32(&fifo_ctrl->isr, ~0UL); | |
43 | out_be32(&fifo_ctrl->ier, 0); | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | int ll_temac_recv_fifo(struct eth_device *dev) | |
49 | { | |
50 | int i, length = 0; | |
1fd92db8 | 51 | u32 *buf = (u32 *)net_rx_packets[0]; |
df482650 SL |
52 | struct ll_temac *ll_temac = dev->priv; |
53 | struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; | |
54 | ||
55 | if (in_be32(&fifo_ctrl->isr) & LL_FIFO_ISR_RC) { | |
56 | ||
57 | /* reset isr */ | |
58 | out_be32(&fifo_ctrl->isr, ~0UL); | |
59 | ||
60 | /* | |
61 | * MAYBE here: | |
62 | * while (fifo_ctrl->isr); | |
63 | */ | |
64 | ||
65 | /* | |
66 | * The length is written (into RLR) by the XPS LL FIFO | |
67 | * when the packet is received across the RX LocalLink | |
68 | * interface and the receive data FIFO had enough | |
69 | * locations that all of the packet data has been saved. | |
70 | * The RLR should only be read when a receive packet is | |
71 | * available for processing (the receive occupancy is | |
72 | * not zero). Once the RLR is read, the receive packet | |
73 | * data should be read from the receive data FIFO before | |
74 | * the RLR is read again. | |
75 | * | |
76 | * [F] page 17, Receive Length Register (RLR) | |
77 | */ | |
78 | if (in_be32(&fifo_ctrl->rdfo) & LL_FIFO_RDFO_MASK) { | |
79 | length = in_be32(&fifo_ctrl->rlf) & LL_FIFO_RLF_MASK; | |
80 | } else { | |
81 | printf("%s: Got error, no receive occupancy\n", | |
82 | __func__); | |
83 | return -1; | |
84 | } | |
85 | ||
86 | if (length > PKTSIZE_ALIGN) { | |
87 | printf("%s: Got error, receive package too big (%i)\n", | |
88 | __func__, length); | |
89 | ll_temac_reset_fifo(dev); | |
90 | return -1; | |
91 | } | |
92 | ||
93 | for (i = 0; i < length; i += 4) | |
94 | *buf++ = in_be32(&fifo_ctrl->rdfd); | |
95 | ||
1fd92db8 | 96 | net_process_received_packet(net_rx_packets[0], length); |
df482650 SL |
97 | } |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
f22ff1ab | 102 | int ll_temac_send_fifo(struct eth_device *dev, void *packet, int length) |
df482650 SL |
103 | { |
104 | int i; | |
105 | u32 *buf = (u32 *)packet; | |
106 | struct ll_temac *ll_temac = dev->priv; | |
107 | struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr; | |
108 | ||
109 | if (length < LL_FIFO_TLF_MIN) { | |
110 | printf("%s: Got error, transmit package too small (%i)\n", | |
111 | __func__, length); | |
112 | return -1; | |
113 | } | |
114 | ||
115 | if (length > LL_FIFO_TLF_MAX) { | |
116 | printf("%s: Got error, transmit package too big (%i)\n", | |
117 | __func__, length); | |
118 | return -1; | |
119 | } | |
120 | ||
121 | for (i = 0; i < length; i += 4) | |
122 | out_be32(&fifo_ctrl->tdfd, *buf++); | |
123 | ||
124 | /* | |
125 | * Once the packet length is written to the TLR it is | |
126 | * automatically moved to the transmit data FIFO with | |
127 | * the packet data freeing up the TLR for another value. | |
128 | * The packet length must be written to the TLR after | |
129 | * the packet data is written to the transmit data FIFO. | |
130 | * It is not valid to write data for multiple packets | |
131 | * to the transmit data FIFO before writing the packet | |
132 | * length values. | |
133 | * | |
134 | * [F] page 17, Transmit Length Register (TLR) | |
135 | */ | |
136 | out_be32(&fifo_ctrl->tlf, length); | |
137 | ||
138 | return 0; | |
139 | } |