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 * SPDX-License-Identifier: GPL-2.0+
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
ll_temac_reset_fifo(struct eth_device * dev)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
ll_temac_recv_fifo(struct eth_device * dev)48 int ll_temac_recv_fifo(struct eth_device *dev)
49 {
50 int i, length = 0;
51 u32 *buf = (u32 *)net_rx_packets[0];
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
96 net_process_received_packet(net_rx_packets[0], length);
97 }
98
99 return 0;
100 }
101
ll_temac_send_fifo(struct eth_device * dev,void * packet,int length)102 int ll_temac_send_fifo(struct eth_device *dev, void *packet, int length)
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 }
140