1 /* suncore.c
2 *
3 * Common SUN serial routines. Based entirely
4 * upon drivers/sbus/char/sunserial.c which is:
5 *
6 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
7 *
8 * Adaptation to new UART layer is:
9 *
10 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
11 */
12
13 #include <linux/config.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/console.h>
17 #include <linux/tty.h>
18 #include <linux/errno.h>
19 #include <linux/string.h>
20 #include <linux/init.h>
21
22 #include <asm/oplib.h>
23
24 #include "suncore.h"
25
26 int sunserial_current_minor = 64;
27
28 EXPORT_SYMBOL(sunserial_current_minor);
29
30 void
31 sunserial_console_termios(struct console *con)
32 {
33 char mode[16], buf[16], *s;
34 char *mode_prop = "ttyX-mode";
35 char *cd_prop = "ttyX-ignore-cd";
36 char *dtr_prop = "ttyX-rts-dtr-off";
37 int baud, bits, stop, cflag;
38 char parity;
39 int carrier = 0;
40 int rtsdtr = 1;
41 int topnd, nd;
42
43 if (!serial_console)
44 return;
45
46 if (serial_console == 1) {
47 mode_prop[3] = 'a';
48 cd_prop[3] = 'a';
49 dtr_prop[3] = 'a';
50 } else {
51 mode_prop[3] = 'b';
52 cd_prop[3] = 'b';
53 dtr_prop[3] = 'b';
54 }
55
56 topnd = prom_getchild(prom_root_node);
57 nd = prom_searchsiblings(topnd, "options");
58 if (!nd) {
59 strcpy(mode, "9600,8,n,1,-");
60 goto no_options;
61 }
62
63 if (!prom_node_has_property(nd, mode_prop)) {
64 strcpy(mode, "9600,8,n,1,-");
65 goto no_options;
66 }
67
68 memset(mode, 0, sizeof(mode));
69 prom_getstring(nd, mode_prop, mode, sizeof(mode));
70
71 if (prom_node_has_property(nd, cd_prop)) {
72 memset(buf, 0, sizeof(buf));
73 prom_getstring(nd, cd_prop, buf, sizeof(buf));
74 if (!strcmp(buf, "false"))
75 carrier = 1;
76
77 /* XXX: this is unused below. */
78 }
79
80 if (prom_node_has_property(nd, dtr_prop)) {
81 memset(buf, 0, sizeof(buf));
82 prom_getstring(nd, dtr_prop, buf, sizeof(buf));
83 if (!strcmp(buf, "false"))
84 rtsdtr = 0;
85
86 /* XXX: this is unused below. */
87 }
88
89 no_options:
90 cflag = CREAD | HUPCL | CLOCAL;
91
92 s = mode;
93 baud = simple_strtoul(s, NULL, 0);
94 s = strchr(s, ',');
95 bits = simple_strtoul(++s, NULL, 0);
96 s = strchr(s, ',');
97 parity = *(++s);
98 s = strchr(s, ',');
99 stop = simple_strtoul(++s, NULL, 0);
100 s = strchr(s, ',');
101 /* XXX handshake is not handled here. */
102
103 switch (baud) {
104 case 150: cflag |= B150; break;
105 case 300: cflag |= B300; break;
106 case 600: cflag |= B600; break;
107 case 1200: cflag |= B1200; break;
108 case 2400: cflag |= B2400; break;
109 case 4800: cflag |= B4800; break;
110 case 9600: cflag |= B9600; break;
111 case 19200: cflag |= B19200; break;
112 case 38400: cflag |= B38400; break;
113 default: baud = 9600; cflag |= B9600; break;
114 }
115
116 switch (bits) {
117 case 5: cflag |= CS5; break;
118 case 6: cflag |= CS6; break;
119 case 7: cflag |= CS7; break;
120 case 8: cflag |= CS8; break;
121 default: cflag |= CS8; break;
122 }
123
124 switch (parity) {
125 case 'o': cflag |= (PARENB | PARODD); break;
126 case 'e': cflag |= PARENB; break;
127 case 'n': default: break;
128 }
129
130 switch (stop) {
131 case 2: cflag |= CSTOPB; break;
132 case 1: default: break;
133 }
134
135 con->cflag = cflag;
136 }
137
138 EXPORT_SYMBOL(sunserial_console_termios);
139
140 /* Sun serial MOUSE auto baud rate detection. */
141 static struct mouse_baud_cflag {
142 int baud;
143 unsigned int cflag;
144 } mouse_baud_table[] = {
145 { 1200, B1200 },
146 { 2400, B2400 },
147 { 4800, B4800 },
148 { 9600, B9600 },
149 { -1, ~0 },
150 { -1, ~0 },
151 };
152
153 unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
154 {
155 int i;
156
157 for (i = 0; mouse_baud_table[i].baud != -1; i++)
158 if (mouse_baud_table[i].cflag == (cflag & CBAUD))
159 break;
160
161 i += 1;
162 if (mouse_baud_table[i].baud == -1)
163 i = 0;
164
165 *new_baud = mouse_baud_table[i].baud;
166 return mouse_baud_table[i].cflag;
167 }
168
169 EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
170
171 /* Basically, when the baud rate is wrong the mouse spits out
172 * breaks to us.
173 */
174 int suncore_mouse_baud_detection(unsigned char ch, int is_break)
175 {
176 static int mouse_got_break = 0;
177 static int ctr = 0;
178
179 if (is_break) {
180 /* Let a few normal bytes go by before we jump the gun
181 * and say we need to try another baud rate.
182 */
183 if (mouse_got_break && ctr < 8)
184 return 1;
185
186 /* Ok, we need to try another baud. */
187 ctr = 0;
188 mouse_got_break = 1;
189 return 2;
190 }
191 if (mouse_got_break) {
192 ctr++;
193 if (ch == 0x87) {
194 /* Correct baud rate determined. */
195 mouse_got_break = 0;
196 }
197 return 1;
198 }
199 return 0;
200 }
201
202 EXPORT_SYMBOL(suncore_mouse_baud_detection);
203
204 static int __init suncore_init(void)
205 {
206 return 0;
207 }
208
209 static void __exit suncore_exit(void)
210 {
211 }
212
213 module_init(suncore_init);
214 module_exit(suncore_exit);
215
216 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
217 MODULE_DESCRIPTION("Sun serial common layer");
218 MODULE_LICENSE("GPL");
219
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