1 // SPDX-License-Identifier: GPL-2.0
2 /* suncore.c
3 *
4 * Common SUN serial routines. Based entirely
5 * upon drivers/sbus/char/sunserial.c which is:
6 *
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 *
9 * Adaptation to new UART layer is:
10 *
11 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
12 */
13
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/sunserialcore.h>
21 #include <linux/init.h>
22
23 #include <asm/prom.h>
24
25
26 static int sunserial_current_minor = 64;
27
sunserial_register_minors(struct uart_driver * drv,int count)28 int 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 }
43 EXPORT_SYMBOL(sunserial_register_minors);
44
sunserial_unregister_minors(struct uart_driver * drv,int count)45 void 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 }
53 EXPORT_SYMBOL(sunserial_unregister_minors);
54
sunserial_console_match(struct console * con,struct device_node * dp,struct uart_driver * drv,int line,bool ignore_line)55 int sunserial_console_match(struct console *con, struct device_node *dp,
56 struct uart_driver *drv, int line, bool ignore_line)
57 {
58 if (!con)
59 return 0;
60
61 drv->cons = con;
62
63 if (of_console_device != dp)
64 return 0;
65
66 if (!ignore_line) {
67 int off = 0;
68
69 if (of_console_options &&
70 *of_console_options == 'b')
71 off = 1;
72
73 if ((line & 1) != off)
74 return 0;
75 }
76
77 if (!console_set_on_cmdline) {
78 con->index = line;
79 add_preferred_console(con->name, line, NULL);
80 }
81 return 1;
82 }
83 EXPORT_SYMBOL(sunserial_console_match);
84
sunserial_console_termios(struct console * con,struct device_node * uart_dp)85 void sunserial_console_termios(struct console *con, struct device_node *uart_dp)
86 {
87 const char *mode, *s;
88 char mode_prop[] = "ttyX-mode";
89 int baud, bits, stop, cflag;
90 char parity;
91
92 if (!strcmp(uart_dp->name, "rsc") ||
93 !strcmp(uart_dp->name, "rsc-console") ||
94 !strcmp(uart_dp->name, "rsc-control")) {
95 mode = of_get_property(uart_dp,
96 "ssp-console-modes", NULL);
97 if (!mode)
98 mode = "115200,8,n,1,-";
99 } else if (!strcmp(uart_dp->name, "lom-console")) {
100 mode = "9600,8,n,1,-";
101 } else {
102 struct device_node *dp;
103 char c;
104
105 c = 'a';
106 if (of_console_options)
107 c = *of_console_options;
108
109 mode_prop[3] = c;
110
111 dp = of_find_node_by_path("/options");
112 mode = of_get_property(dp, mode_prop, NULL);
113 if (!mode)
114 mode = "9600,8,n,1,-";
115 }
116
117 cflag = CREAD | HUPCL | CLOCAL;
118
119 s = mode;
120 baud = simple_strtoul(s, NULL, 0);
121 s = strchr(s, ',');
122 bits = simple_strtoul(++s, NULL, 0);
123 s = strchr(s, ',');
124 parity = *(++s);
125 s = strchr(s, ',');
126 stop = simple_strtoul(++s, NULL, 0);
127 s = strchr(s, ',');
128 /* XXX handshake is not handled here. */
129
130 switch (baud) {
131 case 150: cflag |= B150; break;
132 case 300: cflag |= B300; break;
133 case 600: cflag |= B600; break;
134 case 1200: cflag |= B1200; break;
135 case 2400: cflag |= B2400; break;
136 case 4800: cflag |= B4800; break;
137 case 9600: cflag |= B9600; break;
138 case 19200: cflag |= B19200; break;
139 case 38400: cflag |= B38400; break;
140 case 57600: cflag |= B57600; break;
141 case 115200: cflag |= B115200; break;
142 case 230400: cflag |= B230400; break;
143 case 460800: cflag |= B460800; break;
144 default: baud = 9600; cflag |= B9600; break;
145 }
146
147 switch (bits) {
148 case 5: cflag |= CS5; break;
149 case 6: cflag |= CS6; break;
150 case 7: cflag |= CS7; break;
151 case 8: cflag |= CS8; break;
152 default: cflag |= CS8; break;
153 }
154
155 switch (parity) {
156 case 'o': cflag |= (PARENB | PARODD); break;
157 case 'e': cflag |= PARENB; break;
158 case 'n': default: break;
159 }
160
161 switch (stop) {
162 case 2: cflag |= CSTOPB; break;
163 case 1: default: break;
164 }
165
166 con->cflag = cflag;
167 }
168
169 /* Sun serial MOUSE auto baud rate detection. */
170 static struct mouse_baud_cflag {
171 int baud;
172 unsigned int cflag;
173 } mouse_baud_table[] = {
174 { 1200, B1200 },
175 { 2400, B2400 },
176 { 4800, B4800 },
177 { 9600, B9600 },
178 { -1, ~0 },
179 { -1, ~0 },
180 };
181
suncore_mouse_baud_cflag_next(unsigned int cflag,int * new_baud)182 unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
183 {
184 int i;
185
186 for (i = 0; mouse_baud_table[i].baud != -1; i++)
187 if (mouse_baud_table[i].cflag == (cflag & CBAUD))
188 break;
189
190 i += 1;
191 if (mouse_baud_table[i].baud == -1)
192 i = 0;
193
194 *new_baud = mouse_baud_table[i].baud;
195 return mouse_baud_table[i].cflag;
196 }
197
198 EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
199
200 /* Basically, when the baud rate is wrong the mouse spits out
201 * breaks to us.
202 */
suncore_mouse_baud_detection(unsigned char ch,int is_break)203 int suncore_mouse_baud_detection(unsigned char ch, int is_break)
204 {
205 static int mouse_got_break = 0;
206 static int ctr = 0;
207
208 if (is_break) {
209 /* Let a few normal bytes go by before we jump the gun
210 * and say we need to try another baud rate.
211 */
212 if (mouse_got_break && ctr < 8)
213 return 1;
214
215 /* Ok, we need to try another baud. */
216 ctr = 0;
217 mouse_got_break = 1;
218 return 2;
219 }
220 if (mouse_got_break) {
221 ctr++;
222 if (ch == 0x87) {
223 /* Correct baud rate determined. */
224 mouse_got_break = 0;
225 }
226 return 1;
227 }
228 return 0;
229 }
230
231 EXPORT_SYMBOL(suncore_mouse_baud_detection);
232
suncore_init(void)233 static int __init suncore_init(void)
234 {
235 return 0;
236 }
237 device_initcall(suncore_init);
238
239 #if 0 /* ..def MODULE ; never supported as such */
240 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
241 MODULE_DESCRIPTION("Sun serial common layer");
242 MODULE_LICENSE("GPL");
243 #endif
244
