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 | |
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(uart: 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 | |
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(uart: drv); |
52 | } |
53 | EXPORT_SYMBOL(sunserial_unregister_minors); |
54 | |
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(name: con->name, idx: line, NULL); |
80 | } |
81 | return 1; |
82 | } |
83 | EXPORT_SYMBOL(sunserial_console_match); |
84 | |
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 (of_node_name_eq(np: uart_dp, name: "rsc" ) || |
93 | of_node_name_eq(np: uart_dp, name: "rsc-console" ) || |
94 | of_node_name_eq(np: uart_dp, name: "rsc-control" )) { |
95 | mode = of_get_property(node: uart_dp, |
96 | name: "ssp-console-modes" , NULL); |
97 | if (!mode) |
98 | mode = "115200,8,n,1,-" ; |
99 | } else if (of_node_name_eq(np: 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(path: "/options" ); |
112 | mode = of_get_property(node: dp, name: mode_prop, NULL); |
113 | if (!mode) |
114 | mode = "9600,8,n,1,-" ; |
115 | of_node_put(node: dp); |
116 | } |
117 | |
118 | cflag = CREAD | HUPCL | CLOCAL; |
119 | |
120 | s = mode; |
121 | baud = simple_strtoul(s, NULL, 0); |
122 | s = strchr(s, ','); |
123 | bits = simple_strtoul(++s, NULL, 0); |
124 | s = strchr(s, ','); |
125 | parity = *(++s); |
126 | s = strchr(s, ','); |
127 | stop = simple_strtoul(++s, NULL, 0); |
128 | s = strchr(s, ','); |
129 | /* XXX handshake is not handled here. */ |
130 | |
131 | switch (baud) { |
132 | case 150: cflag |= B150; break; |
133 | case 300: cflag |= B300; break; |
134 | case 600: cflag |= B600; break; |
135 | case 1200: cflag |= B1200; break; |
136 | case 2400: cflag |= B2400; break; |
137 | case 4800: cflag |= B4800; break; |
138 | case 9600: cflag |= B9600; break; |
139 | case 19200: cflag |= B19200; break; |
140 | case 38400: cflag |= B38400; break; |
141 | case 57600: cflag |= B57600; break; |
142 | case 115200: cflag |= B115200; break; |
143 | case 230400: cflag |= B230400; break; |
144 | case 460800: cflag |= B460800; break; |
145 | default: baud = 9600; cflag |= B9600; break; |
146 | } |
147 | |
148 | switch (bits) { |
149 | case 5: cflag |= CS5; break; |
150 | case 6: cflag |= CS6; break; |
151 | case 7: cflag |= CS7; break; |
152 | case 8: cflag |= CS8; break; |
153 | default: cflag |= CS8; break; |
154 | } |
155 | |
156 | switch (parity) { |
157 | case 'o': cflag |= (PARENB | PARODD); break; |
158 | case 'e': cflag |= PARENB; break; |
159 | case 'n': default: break; |
160 | } |
161 | |
162 | switch (stop) { |
163 | case 2: cflag |= CSTOPB; break; |
164 | case 1: default: break; |
165 | } |
166 | |
167 | con->cflag = cflag; |
168 | } |
169 | |
170 | /* Sun serial MOUSE auto baud rate detection. */ |
171 | static struct mouse_baud_cflag { |
172 | int baud; |
173 | unsigned int cflag; |
174 | } mouse_baud_table[] = { |
175 | { 1200, B1200 }, |
176 | { 2400, B2400 }, |
177 | { 4800, B4800 }, |
178 | { 9600, B9600 }, |
179 | { -1, ~0 }, |
180 | { -1, ~0 }, |
181 | }; |
182 | |
183 | unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud) |
184 | { |
185 | int i; |
186 | |
187 | for (i = 0; mouse_baud_table[i].baud != -1; i++) |
188 | if (mouse_baud_table[i].cflag == (cflag & CBAUD)) |
189 | break; |
190 | |
191 | i += 1; |
192 | if (mouse_baud_table[i].baud == -1) |
193 | i = 0; |
194 | |
195 | *new_baud = mouse_baud_table[i].baud; |
196 | return mouse_baud_table[i].cflag; |
197 | } |
198 | |
199 | EXPORT_SYMBOL(suncore_mouse_baud_cflag_next); |
200 | |
201 | /* Basically, when the baud rate is wrong the mouse spits out |
202 | * breaks to us. |
203 | */ |
204 | int suncore_mouse_baud_detection(unsigned char ch, int is_break) |
205 | { |
206 | static int mouse_got_break = 0; |
207 | static int ctr = 0; |
208 | |
209 | if (is_break) { |
210 | /* Let a few normal bytes go by before we jump the gun |
211 | * and say we need to try another baud rate. |
212 | */ |
213 | if (mouse_got_break && ctr < 8) |
214 | return 1; |
215 | |
216 | /* Ok, we need to try another baud. */ |
217 | ctr = 0; |
218 | mouse_got_break = 1; |
219 | return 2; |
220 | } |
221 | if (mouse_got_break) { |
222 | ctr++; |
223 | if (ch == 0x87) { |
224 | /* Correct baud rate determined. */ |
225 | mouse_got_break = 0; |
226 | } |
227 | return 1; |
228 | } |
229 | return 0; |
230 | } |
231 | |
232 | EXPORT_SYMBOL(suncore_mouse_baud_detection); |
233 | |
234 | static int __init suncore_init(void) |
235 | { |
236 | return 0; |
237 | } |
238 | device_initcall(suncore_init); |
239 | |
240 | #if 0 /* ..def MODULE ; never supported as such */ |
241 | MODULE_AUTHOR("Eddie C. Dost, David S. Miller" ); |
242 | MODULE_DESCRIPTION("Sun serial common layer" ); |
243 | MODULE_LICENSE("GPL" ); |
244 | #endif |
245 | |