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