ia64/linux-2.6.18-xen.hg

view drivers/serial/suncore.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
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 */
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/init.h>
21 #include <asm/oplib.h>
23 #include "suncore.h"
25 int sunserial_current_minor = 64;
27 EXPORT_SYMBOL(sunserial_current_minor);
29 void
30 sunserial_console_termios(struct console *con)
31 {
32 char mode[16], buf[16], *s;
33 char *mode_prop = "ttyX-mode";
34 char *cd_prop = "ttyX-ignore-cd";
35 char *dtr_prop = "ttyX-rts-dtr-off";
36 char *ssp_console_modes_prop = "ssp-console-modes";
37 int baud, bits, stop, cflag;
38 char parity;
39 int carrier = 0;
40 int rtsdtr = 1;
41 int topnd, nd;
43 if (!serial_console)
44 return;
46 switch (serial_console) {
47 case PROMDEV_OTTYA:
48 mode_prop[3] = 'a';
49 cd_prop[3] = 'a';
50 dtr_prop[3] = 'a';
51 break;
53 case PROMDEV_OTTYB:
54 mode_prop[3] = 'b';
55 cd_prop[3] = 'b';
56 dtr_prop[3] = 'b';
57 break;
59 case PROMDEV_ORSC:
61 nd = prom_pathtoinode("rsc");
62 if (!nd) {
63 strcpy(mode, "115200,8,n,1,-");
64 goto no_options;
65 }
67 if (!prom_node_has_property(nd, ssp_console_modes_prop)) {
68 strcpy(mode, "115200,8,n,1,-");
69 goto no_options;
70 }
72 memset(mode, 0, sizeof(mode));
73 prom_getstring(nd, ssp_console_modes_prop, mode, sizeof(mode));
74 goto no_options;
76 default:
77 strcpy(mode, "9600,8,n,1,-");
78 goto no_options;
79 }
81 topnd = prom_getchild(prom_root_node);
82 nd = prom_searchsiblings(topnd, "options");
83 if (!nd) {
84 strcpy(mode, "9600,8,n,1,-");
85 goto no_options;
86 }
88 if (!prom_node_has_property(nd, mode_prop)) {
89 strcpy(mode, "9600,8,n,1,-");
90 goto no_options;
91 }
93 memset(mode, 0, sizeof(mode));
94 prom_getstring(nd, mode_prop, mode, sizeof(mode));
96 if (prom_node_has_property(nd, cd_prop)) {
97 memset(buf, 0, sizeof(buf));
98 prom_getstring(nd, cd_prop, buf, sizeof(buf));
99 if (!strcmp(buf, "false"))
100 carrier = 1;
102 /* XXX: this is unused below. */
103 }
105 if (prom_node_has_property(nd, dtr_prop)) {
106 memset(buf, 0, sizeof(buf));
107 prom_getstring(nd, dtr_prop, buf, sizeof(buf));
108 if (!strcmp(buf, "false"))
109 rtsdtr = 0;
111 /* XXX: this is unused below. */
112 }
114 no_options:
115 cflag = CREAD | HUPCL | CLOCAL;
117 s = mode;
118 baud = simple_strtoul(s, NULL, 0);
119 s = strchr(s, ',');
120 bits = simple_strtoul(++s, NULL, 0);
121 s = strchr(s, ',');
122 parity = *(++s);
123 s = strchr(s, ',');
124 stop = simple_strtoul(++s, NULL, 0);
125 s = strchr(s, ',');
126 /* XXX handshake is not handled here. */
128 switch (baud) {
129 case 150: cflag |= B150; break;
130 case 300: cflag |= B300; break;
131 case 600: cflag |= B600; break;
132 case 1200: cflag |= B1200; break;
133 case 2400: cflag |= B2400; break;
134 case 4800: cflag |= B4800; break;
135 case 9600: cflag |= B9600; break;
136 case 19200: cflag |= B19200; break;
137 case 38400: cflag |= B38400; break;
138 case 57600: cflag |= B57600; break;
139 case 115200: cflag |= B115200; break;
140 case 230400: cflag |= B230400; break;
141 case 460800: cflag |= B460800; break;
142 default: baud = 9600; cflag |= B9600; break;
143 }
145 switch (bits) {
146 case 5: cflag |= CS5; break;
147 case 6: cflag |= CS6; break;
148 case 7: cflag |= CS7; break;
149 case 8: cflag |= CS8; break;
150 default: cflag |= CS8; break;
151 }
153 switch (parity) {
154 case 'o': cflag |= (PARENB | PARODD); break;
155 case 'e': cflag |= PARENB; break;
156 case 'n': default: break;
157 }
159 switch (stop) {
160 case 2: cflag |= CSTOPB; break;
161 case 1: default: break;
162 }
164 con->cflag = cflag;
165 }
167 EXPORT_SYMBOL(sunserial_console_termios);
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 };
182 unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
183 {
184 int i;
186 for (i = 0; mouse_baud_table[i].baud != -1; i++)
187 if (mouse_baud_table[i].cflag == (cflag & CBAUD))
188 break;
190 i += 1;
191 if (mouse_baud_table[i].baud == -1)
192 i = 0;
194 *new_baud = mouse_baud_table[i].baud;
195 return mouse_baud_table[i].cflag;
196 }
198 EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
200 /* Basically, when the baud rate is wrong the mouse spits out
201 * breaks to us.
202 */
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;
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;
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 }
231 EXPORT_SYMBOL(suncore_mouse_baud_detection);
233 static int __init suncore_init(void)
234 {
235 return 0;
236 }
238 static void __exit suncore_exit(void)
239 {
240 }
242 module_init(suncore_init);
243 module_exit(suncore_exit);
245 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
246 MODULE_DESCRIPTION("Sun serial common layer");
247 MODULE_LICENSE("GPL");