xref: /openbmc/u-boot/drivers/net/smc911x.c (revision 8c4445d2)
1 /*
2  * SMSC LAN9[12]1[567] Network driver
3  *
4  * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
5  *
6  * See file CREDITS for list of people who contributed to this
7  * project.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation; either version 2 of
12  * the License, or (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22  * MA 02111-1307 USA
23  */
24 
25 #include <common.h>
26 #include <command.h>
27 #include <malloc.h>
28 #include <net.h>
29 #include <miiphy.h>
30 
31 #include "smc911x.h"
32 
33 u32 pkt_data_pull(struct eth_device *dev, u32 addr) \
34 	__attribute__ ((weak, alias ("smc911x_reg_read")));
35 void pkt_data_push(struct eth_device *dev, u32 addr, u32 val) \
36 	__attribute__ ((weak, alias ("smc911x_reg_write")));
37 
38 static void smc911x_handle_mac_address(struct eth_device *dev)
39 {
40 	unsigned long addrh, addrl;
41 	uchar *m = dev->enetaddr;
42 
43 	addrl = m[0] | (m[1] << 8) | (m[2] << 16) | (m[3] << 24);
44 	addrh = m[4] | (m[5] << 8);
45 	smc911x_set_mac_csr(dev, ADDRL, addrl);
46 	smc911x_set_mac_csr(dev, ADDRH, addrh);
47 
48 	printf(DRIVERNAME ": MAC %pM\n", m);
49 }
50 
51 static int smc911x_eth_phy_read(struct eth_device *dev,
52 				u8 phy, u8 reg, u16 *val)
53 {
54 	while (smc911x_get_mac_csr(dev, MII_ACC) & MII_ACC_MII_BUSY)
55 		;
56 
57 	smc911x_set_mac_csr(dev, MII_ACC, phy << 11 | reg << 6 |
58 				MII_ACC_MII_BUSY);
59 
60 	while (smc911x_get_mac_csr(dev, MII_ACC) & MII_ACC_MII_BUSY)
61 		;
62 
63 	*val = smc911x_get_mac_csr(dev, MII_DATA);
64 
65 	return 0;
66 }
67 
68 static int smc911x_eth_phy_write(struct eth_device *dev,
69 				u8 phy, u8 reg, u16  val)
70 {
71 	while (smc911x_get_mac_csr(dev, MII_ACC) & MII_ACC_MII_BUSY)
72 		;
73 
74 	smc911x_set_mac_csr(dev, MII_DATA, val);
75 	smc911x_set_mac_csr(dev, MII_ACC,
76 		phy << 11 | reg << 6 | MII_ACC_MII_BUSY | MII_ACC_MII_WRITE);
77 
78 	while (smc911x_get_mac_csr(dev, MII_ACC) & MII_ACC_MII_BUSY)
79 		;
80 	return 0;
81 }
82 
83 static int smc911x_phy_reset(struct eth_device *dev)
84 {
85 	u32 reg;
86 
87 	reg = smc911x_reg_read(dev, PMT_CTRL);
88 	reg &= ~0xfffff030;
89 	reg |= PMT_CTRL_PHY_RST;
90 	smc911x_reg_write(dev, PMT_CTRL, reg);
91 
92 	mdelay(100);
93 
94 	return 0;
95 }
96 
97 static void smc911x_phy_configure(struct eth_device *dev)
98 {
99 	int timeout;
100 	u16 status;
101 
102 	smc911x_phy_reset(dev);
103 
104 	smc911x_eth_phy_write(dev, 1, MII_BMCR, BMCR_RESET);
105 	mdelay(1);
106 	smc911x_eth_phy_write(dev, 1, MII_ADVERTISE, 0x01e1);
107 	smc911x_eth_phy_write(dev, 1, MII_BMCR, BMCR_ANENABLE |
108 				BMCR_ANRESTART);
109 
110 	timeout = 5000;
111 	do {
112 		mdelay(1);
113 		if ((timeout--) == 0)
114 			goto err_out;
115 
116 		if (smc911x_eth_phy_read(dev, 1, MII_BMSR, &status) != 0)
117 			goto err_out;
118 	} while (!(status & BMSR_LSTATUS));
119 
120 	printf(DRIVERNAME ": phy initialized\n");
121 
122 	return;
123 
124 err_out:
125 	printf(DRIVERNAME ": autonegotiation timed out\n");
126 }
127 
128 static void smc911x_enable(struct eth_device *dev)
129 {
130 	/* Enable TX */
131 	smc911x_reg_write(dev, HW_CFG, 8 << 16 | HW_CFG_SF);
132 
133 	smc911x_reg_write(dev, GPT_CFG, GPT_CFG_TIMER_EN | 10000);
134 
135 	smc911x_reg_write(dev, TX_CFG, TX_CFG_TX_ON);
136 
137 	/* no padding to start of packets */
138 	smc911x_reg_write(dev, RX_CFG, 0);
139 
140 	smc911x_set_mac_csr(dev, MAC_CR, MAC_CR_TXEN | MAC_CR_RXEN |
141 				MAC_CR_HBDIS);
142 
143 }
144 
145 static int smc911x_init(struct eth_device *dev, bd_t * bd)
146 {
147 	struct chip_id *id = dev->priv;
148 
149 	printf(DRIVERNAME ": detected %s controller\n", id->name);
150 
151 	smc911x_reset(dev);
152 
153 	/* Configure the PHY, initialize the link state */
154 	smc911x_phy_configure(dev);
155 
156 	smc911x_handle_mac_address(dev);
157 
158 	/* Turn on Tx + Rx */
159 	smc911x_enable(dev);
160 
161 	return 0;
162 }
163 
164 static int smc911x_send(struct eth_device *dev, void *packet, int length)
165 {
166 	u32 *data = (u32*)packet;
167 	u32 tmplen;
168 	u32 status;
169 
170 	smc911x_reg_write(dev, TX_DATA_FIFO, TX_CMD_A_INT_FIRST_SEG |
171 				TX_CMD_A_INT_LAST_SEG | length);
172 	smc911x_reg_write(dev, TX_DATA_FIFO, length);
173 
174 	tmplen = (length + 3) / 4;
175 
176 	while (tmplen--)
177 		pkt_data_push(dev, TX_DATA_FIFO, *data++);
178 
179 	/* wait for transmission */
180 	while (!((smc911x_reg_read(dev, TX_FIFO_INF) &
181 					TX_FIFO_INF_TSUSED) >> 16));
182 
183 	/* get status. Ignore 'no carrier' error, it has no meaning for
184 	 * full duplex operation
185 	 */
186 	status = smc911x_reg_read(dev, TX_STATUS_FIFO) &
187 			(TX_STS_LOC | TX_STS_LATE_COLL | TX_STS_MANY_COLL |
188 			TX_STS_MANY_DEFER | TX_STS_UNDERRUN);
189 
190 	if (!status)
191 		return 0;
192 
193 	printf(DRIVERNAME ": failed to send packet: %s%s%s%s%s\n",
194 		status & TX_STS_LOC ? "TX_STS_LOC " : "",
195 		status & TX_STS_LATE_COLL ? "TX_STS_LATE_COLL " : "",
196 		status & TX_STS_MANY_COLL ? "TX_STS_MANY_COLL " : "",
197 		status & TX_STS_MANY_DEFER ? "TX_STS_MANY_DEFER " : "",
198 		status & TX_STS_UNDERRUN ? "TX_STS_UNDERRUN" : "");
199 
200 	return -1;
201 }
202 
203 static void smc911x_halt(struct eth_device *dev)
204 {
205 	smc911x_reset(dev);
206 }
207 
208 static int smc911x_rx(struct eth_device *dev)
209 {
210 	u32 *data = (u32 *)NetRxPackets[0];
211 	u32 pktlen, tmplen;
212 	u32 status;
213 
214 	if ((smc911x_reg_read(dev, RX_FIFO_INF) & RX_FIFO_INF_RXSUSED) >> 16) {
215 		status = smc911x_reg_read(dev, RX_STATUS_FIFO);
216 		pktlen = (status & RX_STS_PKT_LEN) >> 16;
217 
218 		smc911x_reg_write(dev, RX_CFG, 0);
219 
220 		tmplen = (pktlen + 3) / 4;
221 		while (tmplen--)
222 			*data++ = pkt_data_pull(dev, RX_DATA_FIFO);
223 
224 		if (status & RX_STS_ES)
225 			printf(DRIVERNAME
226 				": dropped bad packet. Status: 0x%08x\n",
227 				status);
228 		else
229 			NetReceive(NetRxPackets[0], pktlen);
230 	}
231 
232 	return 0;
233 }
234 
235 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
236 /* wrapper for smc911x_eth_phy_read */
237 static int smc911x_miiphy_read(const char *devname, u8 phy, u8 reg, u16 *val)
238 {
239 	struct eth_device *dev = eth_get_dev_by_name(devname);
240 	if (dev)
241 		return smc911x_eth_phy_read(dev, phy, reg, val);
242 	return -1;
243 }
244 /* wrapper for smc911x_eth_phy_write */
245 static int smc911x_miiphy_write(const char *devname, u8 phy, u8 reg, u16 val)
246 {
247 	struct eth_device *dev = eth_get_dev_by_name(devname);
248 	if (dev)
249 		return smc911x_eth_phy_write(dev, phy, reg, val);
250 	return -1;
251 }
252 #endif
253 
254 int smc911x_initialize(u8 dev_num, int base_addr)
255 {
256 	unsigned long addrl, addrh;
257 	struct eth_device *dev;
258 
259 	dev = malloc(sizeof(*dev));
260 	if (!dev) {
261 		return -1;
262 	}
263 	memset(dev, 0, sizeof(*dev));
264 
265 	dev->iobase = base_addr;
266 
267 	/* Try to detect chip. Will fail if not present. */
268 	if (smc911x_detect_chip(dev)) {
269 		free(dev);
270 		return 0;
271 	}
272 
273 	addrh = smc911x_get_mac_csr(dev, ADDRH);
274 	addrl = smc911x_get_mac_csr(dev, ADDRL);
275 	if (!(addrl == 0xffffffff && addrh == 0x0000ffff)) {
276 		/* address is obtained from optional eeprom */
277 		dev->enetaddr[0] = addrl;
278 		dev->enetaddr[1] = addrl >>  8;
279 		dev->enetaddr[2] = addrl >> 16;
280 		dev->enetaddr[3] = addrl >> 24;
281 		dev->enetaddr[4] = addrh;
282 		dev->enetaddr[5] = addrh >> 8;
283 	}
284 
285 	dev->init = smc911x_init;
286 	dev->halt = smc911x_halt;
287 	dev->send = smc911x_send;
288 	dev->recv = smc911x_rx;
289 	sprintf(dev->name, "%s-%hu", DRIVERNAME, dev_num);
290 
291 	eth_register(dev);
292 
293 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
294 	miiphy_register(dev->name, smc911x_miiphy_read, smc911x_miiphy_write);
295 #endif
296 
297 	return 1;
298 }
299