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/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>
  20
  21 #include <asm/oplib.h>
  22
  23 #include "suncore.h"
  24
  25 int sunserial_current_minor = 64;
  26
  27 EXPORT_SYMBOL(sunserial_current_minor);
  28
  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;
  42
  43         if (!serial_console)
  44                 return;
  45
  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;
  52
  53         case PROMDEV_OTTYB:
  54                 mode_prop[3] = 'b';
  55                 cd_prop[3] = 'b';
  56                 dtr_prop[3] = 'b';
  57                 break;
  58
  59         case PROMDEV_ORSC:
  60
  61                 nd = prom_pathtoinode("rsc");
  62                 if (!nd) {
  63                         strcpy(mode, "115200,8,n,1,-");
  64                         goto no_options;
  65                 }
  66
  67                 if (!prom_node_has_property(nd, ssp_console_modes_prop)) {
  68                         strcpy(mode, "115200,8,n,1,-");
  69                         goto no_options;
  70                 }
  71
  72                 memset(mode, 0, sizeof(mode));
  73                 prom_getstring(nd, ssp_console_modes_prop, mode, sizeof(mode));
  74                 goto no_options;
  75
  76         default:
  77                 strcpy(mode, "9600,8,n,1,-");
  78                 goto no_options;
  79         }
  80
  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         }
  87
  88         if (!prom_node_has_property(nd, mode_prop)) {
  89                 strcpy(mode, "9600,8,n,1,-");
  90                 goto no_options;
  91         }
  92
  93         memset(mode, 0, sizeof(mode));
  94         prom_getstring(nd, mode_prop, mode, sizeof(mode));
  95
  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;
 101
 102                 /* XXX: this is unused below. */
 103         }
 104
 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;
 110
 111                 /* XXX: this is unused below. */
 112         }
 113
 114 no_options:
 115         cflag = CREAD | HUPCL | CLOCAL;
 116
 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. */
 127
 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         }
 144
 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         }
 152
 153         switch (parity) {
 154                 case 'o': cflag |= (PARENB | PARODD); break;
 155                 case 'e': cflag |= PARENB; break;
 156                 case 'n': default: break;
 157         }
 158
 159         switch (stop) {
 160                 case 2: cflag |= CSTOPB; break;
 161                 case 1: default: break;
 162         }
 163
 164         con->cflag = cflag;
 165 }
 166
 167 EXPORT_SYMBOL(sunserial_console_termios);
 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
 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  */
 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
 233 static int __init suncore_init(void)
 234 {
 235         return 0;
 236 }
 237
 238 static void __exit suncore_exit(void)
 239 {
 240 }
 241
 242 module_init(suncore_init);
 243 module_exit(suncore_exit);
 244
 245 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
 246 MODULE_DESCRIPTION("Sun serial common layer");
 247 MODULE_LICENSE("GPL");