3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 #include <stdio_dev.h>
29 DECLARE_GLOBAL_DATA_PTR;
31 static char input_buffer[512];
32 static int input_size = 0; /* char count in input buffer */
33 static int input_offset = 0; /* offset to valid chars in input buffer */
34 static int input_recursion = 0;
35 static int output_recursion = 0;
36 static int net_timeout;
37 static uchar nc_ether[6]; /* server enet address */
38 static IPaddr_t nc_ip; /* server ip */
39 static short nc_port; /* source/target port */
40 static const char *output_packet; /* used by first send udp */
41 static int output_packet_len = 0;
43 static void nc_wait_arp_handler(uchar *pkt, unsigned dest,
44 IPaddr_t sip, unsigned src,
47 NetState = NETLOOP_SUCCESS; /* got arp reply - quit net loop */
50 static void nc_handler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
54 NetState = NETLOOP_SUCCESS; /* got input - quit net loop */
57 static void nc_timeout (void)
59 NetState = NETLOOP_SUCCESS;
64 if (!output_packet_len || memcmp (nc_ether, NetEtherNullAddr, 6)) {
65 /* going to check for input packet */
66 NetSetHandler (nc_handler);
67 NetSetTimeout (net_timeout, nc_timeout);
69 /* send arp request */
71 NetSetHandler (nc_wait_arp_handler);
72 pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE;
73 memcpy (pkt, output_packet, output_packet_len);
74 NetSendUDPPacket (nc_ether, nc_ip, nc_port, nc_port, output_packet_len);
78 int nc_input_packet (uchar * pkt, unsigned dest, unsigned src, unsigned len)
82 if (dest != nc_port || !len)
83 return 0; /* not for us */
85 if (input_size == sizeof input_buffer)
86 return 1; /* no space */
87 if (len > sizeof input_buffer - input_size)
88 len = sizeof input_buffer - input_size;
90 end = input_offset + input_size;
91 if (end > sizeof input_buffer)
92 end -= sizeof input_buffer;
95 if (end + len > sizeof input_buffer) {
96 chunk = sizeof input_buffer - end;
97 memcpy(input_buffer, pkt + chunk, len - chunk);
99 memcpy (input_buffer + end, pkt, chunk);
106 static void nc_send_packet (const char *buf, int len)
108 struct eth_device *eth;
114 if ((eth = eth_get_dev ()) == NULL) {
118 if (!memcmp (nc_ether, NetEtherNullAddr, 6)) {
119 if (eth->state == ETH_STATE_ACTIVE)
120 return; /* inside net loop */
122 output_packet_len = len;
123 NetLoop (NETCONS); /* wait for arp reply and send packet */
124 output_packet_len = 0;
128 if (eth->state != ETH_STATE_ACTIVE) {
129 if (eth_init (gd->bd) < 0)
133 pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE;
134 memcpy (pkt, buf, len);
137 NetSendUDPPacket (ether, ip, nc_port, nc_port, len);
143 static int nc_start(void)
147 nc_port = 6666; /* default port */
149 if (getenv ("ncip")) {
152 nc_ip = getenv_IPaddr ("ncip");
154 return -1; /* ncip is 0.0.0.0 */
155 if ((p = strchr (getenv ("ncip"), ':')) != NULL)
156 nc_port = simple_strtoul (p + 1, NULL, 10);
158 nc_ip = ~0; /* ncip is not set */
160 our_ip = getenv_IPaddr ("ipaddr");
161 netmask = getenv_IPaddr ("netmask");
163 if (nc_ip == ~0 || /* 255.255.255.255 */
164 ((netmask & our_ip) == (netmask & nc_ip) && /* on the same net */
165 (netmask | nc_ip) == ~0)) /* broadcast to our net */
166 memset (nc_ether, 0xff, sizeof nc_ether);
168 memset (nc_ether, 0, sizeof nc_ether); /* force arp request */
173 static void nc_putc(char c)
175 if (output_recursion)
177 output_recursion = 1;
179 nc_send_packet (&c, 1);
181 output_recursion = 0;
184 static void nc_puts(const char *s)
188 if (output_recursion)
190 output_recursion = 1;
194 int send_len = min(len, 512);
195 nc_send_packet(s, send_len);
200 output_recursion = 0;
203 static int nc_getc(void)
209 net_timeout = 0; /* no timeout */
215 c = input_buffer[input_offset++];
217 if (input_offset >= sizeof input_buffer)
218 input_offset -= sizeof input_buffer;
224 static int nc_tstc(void)
226 struct eth_device *eth;
234 eth = eth_get_dev ();
235 if (eth && eth->state == ETH_STATE_ACTIVE)
236 return 0; /* inside net loop */
241 NetLoop (NETCONS); /* kind of poll */
245 return input_size != 0;
248 int drv_nc_init (void)
250 struct stdio_dev dev;
253 memset (&dev, 0, sizeof (dev));
255 strcpy (dev.name, "nc");
256 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
257 dev.start = nc_start;
263 rc = stdio_register (&dev);
265 return (rc == 0) ? 1 : rc;