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         char *ssp_console_modes_prop = "ssp-console-modes";
  38         int baud, bits, stop, cflag;
  39         char parity;
  40         int carrier = 0;
  41         int rtsdtr = 1;
  42         int topnd, nd;
  43
  44         if (!serial_console)
  45                 return;
  46
  47         switch (serial_console) {
  48         case PROMDEV_OTTYA:
  49                 mode_prop[3] = 'a';
  50                 cd_prop[3] = 'a';
  51                 dtr_prop[3] = 'a';
  52                 break;
  53
  54         case PROMDEV_OTTYB:
  55                 mode_prop[3] = 'b';
  56                 cd_prop[3] = 'b';
  57                 dtr_prop[3] = 'b';
  58                 break;
  59
  60         case PROMDEV_ORSC:
  61
  62                 nd = prom_pathtoinode("rsc");
  63                 if (!nd) {
  64                         strcpy(mode, "115200,8,n,1,-");
  65                         goto no_options;
  66                 }
  67
  68                 if (!prom_node_has_property(nd, ssp_console_modes_prop)) {
  69                         strcpy(mode, "115200,8,n,1,-");
  70                         goto no_options;
  71                 }
  72
  73                 memset(mode, 0, sizeof(mode));
  74                 prom_getstring(nd, ssp_console_modes_prop, mode, sizeof(mode));
  75                 goto no_options;
  76
  77         default:
  78                 strcpy(mode, "9600,8,n,1,-");
  79                 goto no_options;
  80         }
  81
  82         topnd = prom_getchild(prom_root_node);
  83         nd = prom_searchsiblings(topnd, "options");
  84         if (!nd) {
  85                 strcpy(mode, "9600,8,n,1,-");
  86                 goto no_options;
  87         }
  88
  89         if (!prom_node_has_property(nd, mode_prop)) {
  90                 strcpy(mode, "9600,8,n,1,-");
  91                 goto no_options;
  92         }
  93
  94         memset(mode, 0, sizeof(mode));
  95         prom_getstring(nd, mode_prop, mode, sizeof(mode));
  96
  97         if (prom_node_has_property(nd, cd_prop)) {
  98                 memset(buf, 0, sizeof(buf));
  99                 prom_getstring(nd, cd_prop, buf, sizeof(buf));
 100                 if (!strcmp(buf, "false"))
 101                         carrier = 1;
 102
 103                 /* XXX: this is unused below. */
 104         }
 105
 106         if (prom_node_has_property(nd, dtr_prop)) {
 107                 memset(buf, 0, sizeof(buf));
 108                 prom_getstring(nd, dtr_prop, buf, sizeof(buf));
 109                 if (!strcmp(buf, "false"))
 110                         rtsdtr = 0;
 111
 112                 /* XXX: this is unused below. */
 113         }
 114
 115 no_options:
 116         cflag = CREAD | HUPCL | CLOCAL;
 117
 118         s = mode;
 119         baud = simple_strtoul(s, NULL, 0);
 120         s = strchr(s, ',');
 121         bits = simple_strtoul(++s, NULL, 0);
 122         s = strchr(s, ',');
 123         parity = *(++s);
 124         s = strchr(s, ',');
 125         stop = simple_strtoul(++s, NULL, 0);
 126         s = strchr(s, ',');
 127         /* XXX handshake is not handled here. */
 128
 129         switch (baud) {
 130                 case 150: cflag |= B150; break;
 131                 case 300: cflag |= B300; break;
 132                 case 600: cflag |= B600; break;
 133                 case 1200: cflag |= B1200; break;
 134                 case 2400: cflag |= B2400; break;
 135                 case 4800: cflag |= B4800; break;
 136                 case 9600: cflag |= B9600; break;
 137                 case 19200: cflag |= B19200; break;
 138                 case 38400: cflag |= B38400; break;
 139                 case 57600: cflag |= B57600; break;
 140                 case 115200: cflag |= B115200; break;
 141                 case 230400: cflag |= B230400; break;
 142                 case 460800: cflag |= B460800; break;
 143                 default: baud = 9600; cflag |= B9600; break;
 144         }
 145
 146         switch (bits) {
 147                 case 5: cflag |= CS5; break;
 148                 case 6: cflag |= CS6; break;
 149                 case 7: cflag |= CS7; break;
 150                 case 8: cflag |= CS8; break;
 151                 default: cflag |= CS8; break;
 152         }
 153
 154         switch (parity) {
 155                 case 'o': cflag |= (PARENB | PARODD); break;
 156                 case 'e': cflag |= PARENB; break;
 157                 case 'n': default: break;
 158         }
 159
 160         switch (stop) {
 161                 case 2: cflag |= CSTOPB; break;
 162                 case 1: default: break;
 163         }
 164
 165         con->cflag = cflag;
 166 }
 167
 168 EXPORT_SYMBOL(sunserial_console_termios);
 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
 239 static void __exit suncore_exit(void)
 240 {
 241 }
 242
 243 module_init(suncore_init);
 244 module_exit(suncore_exit);
 245
 246 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
 247 MODULE_DESCRIPTION("Sun serial common layer");
 248 MODULE_LICENSE("GPL");