aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/ftmac100.c
blob: 94dc6d99ba6016d4782ccbe4e592cc6f570575f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
/*
 * Faraday FTMAC100 Ethernet
 *
 * (C) Copyright 2009 Faraday Technology
 * Po-Yu Chuang <ratbert@faraday-tech.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <config.h>
#include <common.h>
#include <malloc.h>
#include <net.h>
#include <asm/io.h>

#include "ftmac100.h"

#define ETH_ZLEN	60

struct ftmac100_data {
	struct ftmac100_txdes txdes[1];
	struct ftmac100_rxdes rxdes[PKTBUFSRX];
	int rx_index;
};

/*
 * Reset MAC
 */
static void ftmac100_reset (struct eth_device *dev)
{
	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;

	debug ("%s()\n", __func__);

	writel (FTMAC100_MACCR_SW_RST, &ftmac100->maccr);

	while (readl (&ftmac100->maccr) & FTMAC100_MACCR_SW_RST)
		;
}

/*
 * Set MAC address
 */
static void ftmac100_set_mac (struct eth_device *dev, const unsigned char *mac)
{
	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;
	unsigned int maddr = mac[0] << 8 | mac[1];
	unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];

	debug ("%s(%x %x)\n", __func__, maddr, laddr);

	writel (maddr, &ftmac100->mac_madr);
	writel (laddr, &ftmac100->mac_ladr);
}

static void ftmac100_set_mac_from_env (struct eth_device *dev)
{
	eth_getenv_enetaddr ("ethaddr", dev->enetaddr);

	ftmac100_set_mac (dev, dev->enetaddr);
}

/*
 * disable transmitter, receiver
 */
static void ftmac100_halt (struct eth_device *dev)
{
	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;

	debug ("%s()\n", __func__);

	writel (0, &ftmac100->maccr);
}

static int ftmac100_init (struct eth_device *dev, bd_t *bd)
{
	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;
	struct ftmac100_data *priv = dev->priv;
	struct ftmac100_txdes *txdes = priv->txdes;
	struct ftmac100_rxdes *rxdes = priv->rxdes;
	unsigned int maccr;
	int i;

	debug ("%s()\n", __func__);

	ftmac100_reset (dev);

	/* set the ethernet address */

	ftmac100_set_mac_from_env (dev);

	/* disable all interrupts */

	writel (0, &ftmac100->imr);

	/* initialize descriptors */

	priv->rx_index = 0;

	txdes[0].txdes1			= FTMAC100_TXDES1_EDOTR;
	rxdes[PKTBUFSRX - 1].rxdes1	= FTMAC100_RXDES1_EDORR;

	for (i = 0; i < PKTBUFSRX; i++) {
		/* RXBUF_BADR */
		rxdes[i].rxdes2 = (unsigned int)NetRxPackets[i];
		rxdes[i].rxdes1 |= FTMAC100_RXDES1_RXBUF_SIZE (PKTSIZE_ALIGN);
		rxdes[i].rxdes0 = FTMAC100_RXDES0_RXDMA_OWN;
	}

	/* transmit ring */

	writel ((unsigned int)txdes, &ftmac100->txr_badr);

	/* receive ring */

	writel ((unsigned int)rxdes, &ftmac100->rxr_badr);

	/* poll receive descriptor automatically */

	writel (FTMAC100_APTC_RXPOLL_CNT (1), &ftmac100->aptc);

	/* enable transmitter, receiver */

	maccr = FTMAC100_MACCR_XMT_EN |
		FTMAC100_MACCR_RCV_EN |
		FTMAC100_MACCR_XDMA_EN |
		FTMAC100_MACCR_RDMA_EN |
		FTMAC100_MACCR_CRC_APD |
		FTMAC100_MACCR_ENRX_IN_HALFTX |
		FTMAC100_MACCR_RX_RUNT |
		FTMAC100_MACCR_RX_BROADPKT;

	writel (maccr, &ftmac100->maccr);

	return 0;
}

/*
 * Get a data block via Ethernet
 */
static int ftmac100_recv (struct eth_device *dev)
{
	struct ftmac100_data *priv = dev->priv;
	struct ftmac100_rxdes *curr_des;
	unsigned short rxlen;

	curr_des = &priv->rxdes[priv->rx_index];

	if (curr_des->rxdes0 & FTMAC100_RXDES0_RXDMA_OWN)
		return -1;

	if (curr_des->rxdes0 & (FTMAC100_RXDES0_RX_ERR |
				FTMAC100_RXDES0_CRC_ERR |
				FTMAC100_RXDES0_FTL |
				FTMAC100_RXDES0_RUNT |
				FTMAC100_RXDES0_RX_ODD_NB)) {
		return -1;
	}

	rxlen = FTMAC100_RXDES0_RFL (curr_des->rxdes0);

	debug ("%s(): RX buffer %d, %x received\n",
	       __func__, priv->rx_index, rxlen);

	/* pass the packet up to the protocol layers. */

	NetReceive ((void *)curr_des->rxdes2, rxlen);

	/* release buffer to DMA */

	curr_des->rxdes0 |= FTMAC100_RXDES0_RXDMA_OWN;

	priv->rx_index = (priv->rx_index + 1) % PKTBUFSRX;

	return 0;
}

/*
 * Send a data block via Ethernet
 */
static int
ftmac100_send (struct eth_device *dev, volatile void *packet, int length)
{
	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;
	struct ftmac100_data *priv = dev->priv;
	struct ftmac100_txdes *curr_des = priv->txdes;
	ulong start;

	if (curr_des->txdes0 & FTMAC100_TXDES0_TXDMA_OWN) {
		debug ("%s(): no TX descriptor available\n", __func__);
		return -1;
	}

	debug ("%s(%x, %x)\n", __func__, (int)packet, length);

	length = (length < ETH_ZLEN) ? ETH_ZLEN : length;

	/* initiate a transmit sequence */

	curr_des->txdes2 = (unsigned int)packet;	/* TXBUF_BADR */

	curr_des->txdes1 &= FTMAC100_TXDES1_EDOTR;
	curr_des->txdes1 |= FTMAC100_TXDES1_FTS |
			    FTMAC100_TXDES1_LTS |
			    FTMAC100_TXDES1_TXBUF_SIZE (length);

	curr_des->txdes0 = FTMAC100_TXDES0_TXDMA_OWN;

	/* start transmit */

	writel (1, &ftmac100->txpd);

	/* wait for transfer to succeed */

	start = get_timer(0);
	while (curr_des->txdes0 & FTMAC100_TXDES0_TXDMA_OWN) {
		if (get_timer(start) >= 5) {
			debug ("%s(): timed out\n", __func__);
			return -1;
		}
	}

	debug ("%s(): packet sent\n", __func__);

	return 0;
}

int ftmac100_initialize (bd_t *bd)
{
	struct eth_device *dev;
	struct ftmac100_data *priv;

	dev = malloc (sizeof *dev);
	if (!dev) {
		printf ("%s(): failed to allocate dev\n", __func__);
		goto out;
	}

	/* Transmit and receive descriptors should align to 16 bytes */

	priv = memalign (16, sizeof (struct ftmac100_data));
	if (!priv) {
		printf ("%s(): failed to allocate priv\n", __func__);
		goto free_dev;
	}

	memset (dev, 0, sizeof (*dev));
	memset (priv, 0, sizeof (*priv));

	sprintf (dev->name, "FTMAC100");
	dev->iobase	= CONFIG_FTMAC100_BASE;
	dev->init	= ftmac100_init;
	dev->halt	= ftmac100_halt;
	dev->send	= ftmac100_send;
	dev->recv	= ftmac100_recv;
	dev->priv	= priv;

	eth_register (dev);

	return 1;

free_dev:
	free (dev);
out:
	return 0;
}