drivers/serial/suncore.c

   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/config.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/console.h>
  17 #include <linux/tty.h>
  18 #include <linux/errno.h>
  19 #include <linux/string.h>
  20 #include <linux/init.h>
  21
  22 #include <asm/oplib.h>
  23
  24 #include "suncore.h"
  25
  26 int sunserial_current_minor = 64;
  27
  28 EXPORT_SYMBOL(sunserial_current_minor);
  29
  30 void
  31 sunserial_console_termios(struct console *con)
  32 {
  33         char mode[16], buf[16], *s;
  34         char *mode_prop = "ttyX-mode";
  35         char *cd_prop = "ttyX-ignore-cd";
  36         char *dtr_prop = "ttyX-rts-dtr-off";
  37         int baud, bits, stop, cflag;
  38         char parity;
  39         int carrier = 0;
  40         int rtsdtr = 1;
  41         int topnd, nd;
  42
  43         if (!serial_console)
  44                 return;
  45
  46         if (serial_console == 1) {
  47                 mode_prop[3] = 'a';
  48                 cd_prop[3] = 'a';
  49                 dtr_prop[3] = 'a';
  50         } else {
  51                 mode_prop[3] = 'b';
  52                 cd_prop[3] = 'b';
  53                 dtr_prop[3] = 'b';
  54         }
  55
  56         topnd = prom_getchild(prom_root_node);
  57         nd = prom_searchsiblings(topnd, "options");
  58         if (!nd) {
  59                 strcpy(mode, "9600,8,n,1,-");
  60                 goto no_options;
  61         }
  62
  63         if (!prom_node_has_property(nd, mode_prop)) {
  64                 strcpy(mode, "9600,8,n,1,-");
  65                 goto no_options;
  66         }
  67
  68         memset(mode, 0, sizeof(mode));
  69         prom_getstring(nd, mode_prop, mode, sizeof(mode));
  70
  71         if (prom_node_has_property(nd, cd_prop)) {
  72                 memset(buf, 0, sizeof(buf));
  73                 prom_getstring(nd, cd_prop, buf, sizeof(buf));
  74                 if (!strcmp(buf, "false"))
  75                         carrier = 1;
  76
  77                 /* XXX: this is unused below. */
  78         }
  79
  80         if (prom_node_has_property(nd, dtr_prop)) {
  81                 memset(buf, 0, sizeof(buf));
  82                 prom_getstring(nd, dtr_prop, buf, sizeof(buf));
  83                 if (!strcmp(buf, "false"))
  84                         rtsdtr = 0;
  85
  86                 /* XXX: this is unused below. */
  87         }
  88
  89 no_options:
  90         cflag = CREAD | HUPCL | CLOCAL;
  91
  92         s = mode;
  93         baud = simple_strtoul(s, NULL, 0);
  94         s = strchr(s, ',');
  95         bits = simple_strtoul(++s, NULL, 0);
  96         s = strchr(s, ',');
  97         parity = *(++s);
  98         s = strchr(s, ',');
  99         stop = simple_strtoul(++s, NULL, 0);
 100         s = strchr(s, ',');
 101         /* XXX handshake is not handled here. */
 102
 103         switch (baud) {
 104                 case 150: cflag |= B150; break;
 105                 case 300: cflag |= B300; break;
 106                 case 600: cflag |= B600; break;
 107                 case 1200: cflag |= B1200; break;
 108                 case 2400: cflag |= B2400; break;
 109                 case 4800: cflag |= B4800; break;
 110                 case 9600: cflag |= B9600; break;
 111                 case 19200: cflag |= B19200; break;
 112                 case 38400: cflag |= B38400; break;
 113                 default: baud = 9600; cflag |= B9600; break;
 114         }
 115
 116         switch (bits) {
 117                 case 5: cflag |= CS5; break;
 118                 case 6: cflag |= CS6; break;
 119                 case 7: cflag |= CS7; break;
 120                 case 8: cflag |= CS8; break;
 121                 default: cflag |= CS8; break;
 122         }
 123
 124         switch (parity) {
 125                 case 'o': cflag |= (PARENB | PARODD); break;
 126                 case 'e': cflag |= PARENB; break;
 127                 case 'n': default: break;
 128         }
 129
 130         switch (stop) {
 131                 case 2: cflag |= CSTOPB; break;
 132                 case 1: default: break;
 133         }
 134
 135         con->cflag = cflag;
 136 }
 137
 138 EXPORT_SYMBOL(sunserial_console_termios);
 139
 140 /* Sun serial MOUSE auto baud rate detection.  */
 141 static struct mouse_baud_cflag {
 142         int baud;
 143         unsigned int cflag;
 144 } mouse_baud_table[] = {
 145         { 1200, B1200 },
 146         { 2400, B2400 },
 147         { 4800, B4800 },
 148         { 9600, B9600 },
 149         { -1, ~0 },
 150         { -1, ~0 },
 151 };
 152
 153 unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
 154 {
 155         int i;
 156
 157         for (i = 0; mouse_baud_table[i].baud != -1; i++)
 158                 if (mouse_baud_table[i].cflag == (cflag & CBAUD))
 159                         break;
 160
 161         i += 1;
 162         if (mouse_baud_table[i].baud == -1)
 163                 i = 0;
 164
 165         *new_baud = mouse_baud_table[i].baud;
 166         return mouse_baud_table[i].cflag;
 167 }
 168
 169 EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
 170
 171 /* Basically, when the baud rate is wrong the mouse spits out
 172  * breaks to us.
 173  */
 174 int suncore_mouse_baud_detection(unsigned char ch, int is_break)
 175 {
 176         static int mouse_got_break = 0;
 177         static int ctr = 0;
 178
 179         if (is_break) {
 180                 /* Let a few normal bytes go by before we jump the gun
 181                  * and say we need to try another baud rate.
 182                  */
 183                 if (mouse_got_break && ctr < 8)
 184                         return 1;
 185
 186                 /* Ok, we need to try another baud. */
 187                 ctr = 0;
 188                 mouse_got_break = 1;
 189                 return 2;
 190         }
 191         if (mouse_got_break) {
 192                 ctr++;
 193                 if (ch == 0x87) {
 194                         /* Correct baud rate determined. */
 195                         mouse_got_break = 0;
 196                 }
 197                 return 1;
 198         }
 199         return 0;
 200 }
 201
 202 EXPORT_SYMBOL(suncore_mouse_baud_detection);
 203
 204 static int __init suncore_init(void)
 205 {
 206         return 0;
 207 }
 208
 209 static void __exit suncore_exit(void)
 210 {
 211 }
 212
 213 module_init(suncore_init);
 214 module_exit(suncore_exit);
 215
 216 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
 217 MODULE_DESCRIPTION("Sun serial common layer");
 218 MODULE_LICENSE("GPL");