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Linux kernel mirror (for testing)
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linux
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/module.h>
14#include <linux/kernel.h>
15#include <linux/console.h>
16#include <linux/tty.h>
17#include <linux/errno.h>
18#include <linux/string.h>
19#include <linux/serial_core.h>
20#include <linux/init.h>
21
22#include <asm/prom.h>
23
24#include "suncore.h"
25
26static int sunserial_current_minor = 64;
27
28int sunserial_register_minors(struct uart_driver *drv, int count)
29{
30 int err = 0;
31
32 drv->minor = sunserial_current_minor;
33 drv->nr += count;
34 /* Register the driver on the first call */
35 if (drv->nr == count)
36 err = uart_register_driver(drv);
37 if (err == 0) {
38 sunserial_current_minor += count;
39 drv->tty_driver->name_base = drv->minor - 64;
40 }
41 return err;
42}
43EXPORT_SYMBOL(sunserial_register_minors);
44
45void sunserial_unregister_minors(struct uart_driver *drv, int count)
46{
47 drv->nr -= count;
48 sunserial_current_minor -= count;
49
50 if (drv->nr == 0)
51 uart_unregister_driver(drv);
52}
53EXPORT_SYMBOL(sunserial_unregister_minors);
54
55int sunserial_console_match(struct console *con, struct device_node *dp,
56 struct uart_driver *drv, int line, bool ignore_line)
57{
58 if (!con || of_console_device != dp)
59 return 0;
60
61 if (!ignore_line) {
62 int off = 0;
63
64 if (of_console_options &&
65 *of_console_options == 'b')
66 off = 1;
67
68 if ((line & 1) != off)
69 return 0;
70 }
71
72 con->index = line;
73 drv->cons = con;
74 add_preferred_console(con->name, line, NULL);
75
76 return 1;
77}
78EXPORT_SYMBOL(sunserial_console_match);
79
80void sunserial_console_termios(struct console *con, struct device_node *uart_dp)
81{
82 const char *mode, *s;
83 char mode_prop[] = "ttyX-mode";
84 int baud, bits, stop, cflag;
85 char parity;
86
87 if (!strcmp(uart_dp->name, "rsc") ||
88 !strcmp(uart_dp->name, "rsc-console") ||
89 !strcmp(uart_dp->name, "rsc-control")) {
90 mode = of_get_property(uart_dp,
91 "ssp-console-modes", NULL);
92 if (!mode)
93 mode = "115200,8,n,1,-";
94 } else if (!strcmp(uart_dp->name, "lom-console")) {
95 mode = "9600,8,n,1,-";
96 } else {
97 struct device_node *dp;
98 char c;
99
100 c = 'a';
101 if (of_console_options)
102 c = *of_console_options;
103
104 mode_prop[3] = c;
105
106 dp = of_find_node_by_path("/options");
107 mode = of_get_property(dp, mode_prop, NULL);
108 if (!mode)
109 mode = "9600,8,n,1,-";
110 }
111
112 cflag = CREAD | HUPCL | CLOCAL;
113
114 s = mode;
115 baud = simple_strtoul(s, NULL, 0);
116 s = strchr(s, ',');
117 bits = simple_strtoul(++s, NULL, 0);
118 s = strchr(s, ',');
119 parity = *(++s);
120 s = strchr(s, ',');
121 stop = simple_strtoul(++s, NULL, 0);
122 s = strchr(s, ',');
123 /* XXX handshake is not handled here. */
124
125 switch (baud) {
126 case 150: cflag |= B150; break;
127 case 300: cflag |= B300; break;
128 case 600: cflag |= B600; break;
129 case 1200: cflag |= B1200; break;
130 case 2400: cflag |= B2400; break;
131 case 4800: cflag |= B4800; break;
132 case 9600: cflag |= B9600; break;
133 case 19200: cflag |= B19200; break;
134 case 38400: cflag |= B38400; break;
135 case 57600: cflag |= B57600; break;
136 case 115200: cflag |= B115200; break;
137 case 230400: cflag |= B230400; break;
138 case 460800: cflag |= B460800; break;
139 default: baud = 9600; cflag |= B9600; break;
140 }
141
142 switch (bits) {
143 case 5: cflag |= CS5; break;
144 case 6: cflag |= CS6; break;
145 case 7: cflag |= CS7; break;
146 case 8: cflag |= CS8; break;
147 default: cflag |= CS8; break;
148 }
149
150 switch (parity) {
151 case 'o': cflag |= (PARENB | PARODD); break;
152 case 'e': cflag |= PARENB; break;
153 case 'n': default: break;
154 }
155
156 switch (stop) {
157 case 2: cflag |= CSTOPB; break;
158 case 1: default: break;
159 }
160
161 con->cflag = cflag;
162}
163
164/* Sun serial MOUSE auto baud rate detection. */
165static struct mouse_baud_cflag {
166 int baud;
167 unsigned int cflag;
168} mouse_baud_table[] = {
169 { 1200, B1200 },
170 { 2400, B2400 },
171 { 4800, B4800 },
172 { 9600, B9600 },
173 { -1, ~0 },
174 { -1, ~0 },
175};
176
177unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
178{
179 int i;
180
181 for (i = 0; mouse_baud_table[i].baud != -1; i++)
182 if (mouse_baud_table[i].cflag == (cflag & CBAUD))
183 break;
184
185 i += 1;
186 if (mouse_baud_table[i].baud == -1)
187 i = 0;
188
189 *new_baud = mouse_baud_table[i].baud;
190 return mouse_baud_table[i].cflag;
191}
192
193EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
194
195/* Basically, when the baud rate is wrong the mouse spits out
196 * breaks to us.
197 */
198int suncore_mouse_baud_detection(unsigned char ch, int is_break)
199{
200 static int mouse_got_break = 0;
201 static int ctr = 0;
202
203 if (is_break) {
204 /* Let a few normal bytes go by before we jump the gun
205 * and say we need to try another baud rate.
206 */
207 if (mouse_got_break && ctr < 8)
208 return 1;
209
210 /* Ok, we need to try another baud. */
211 ctr = 0;
212 mouse_got_break = 1;
213 return 2;
214 }
215 if (mouse_got_break) {
216 ctr++;
217 if (ch == 0x87) {
218 /* Correct baud rate determined. */
219 mouse_got_break = 0;
220 }
221 return 1;
222 }
223 return 0;
224}
225
226EXPORT_SYMBOL(suncore_mouse_baud_detection);
227
228static int __init suncore_init(void)
229{
230 return 0;
231}
232
233static void __exit suncore_exit(void)
234{
235}
236
237module_init(suncore_init);
238module_exit(suncore_exit);
239
240MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
241MODULE_DESCRIPTION("Sun serial common layer");
242MODULE_LICENSE("GPL");