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/serial_core.h>
  20 #include <linux/init.h>
  21
  22 #include <asm/prom.h>
  23
  24 #include "suncore.h"
  25
  26 int sunserial_current_minor = 64;
  27
  28 EXPORT_SYMBOL(sunserial_current_minor);
  29
  30 int sunserial_console_match(struct console *con, struct device_node *dp,
  31                             struct uart_driver *drv, int line)
  32 {
  33         int off;
  34
  35         if (!con || of_console_device != dp)
  36                 return 0;
  37
  38         off = 0;
  39         if (of_console_options &&
  40             *of_console_options == 'b')
  41                 off = 1;
  42
  43         if ((line & 1) != off)
  44                 return 0;
  45
  46         con->index = line;
  47         drv->cons = con;
  48         add_preferred_console(con->name, line, NULL);
  49
  50         return 1;
  51 }
  52 EXPORT_SYMBOL(sunserial_console_match);
  53
  54 void
  55 sunserial_console_termios(struct console *con)
  56 {
  57         struct device_node *dp;
  58         const char *od, *mode, *s;
  59         char mode_prop[] = "ttyX-mode";
  60         int baud, bits, stop, cflag;
  61         char parity;
  62
  63         dp = of_find_node_by_path("/options");
  64         od = of_get_property(dp, "output-device", NULL);
  65         if (!strcmp(od, "rsc")) {
  66                 mode = of_get_property(of_console_device,
  67                                        "ssp-console-modes", NULL);
  68                 if (!mode)
  69                         mode = "115200,8,n,1,-";
  70         } else {
  71                 char c;
  72
  73                 c = 'a';
  74                 if (of_console_options)
  75                         c = *of_console_options;
  76
  77                 mode_prop[3] = c;
  78
  79                 mode = of_get_property(dp, mode_prop, NULL);
  80                 if (!mode)
  81                         mode = "9600,8,n,1,-";
  82         }
  83
  84         cflag = CREAD | HUPCL | CLOCAL;
  85
  86         s = mode;
  87         baud = simple_strtoul(s, NULL, 0);
  88         s = strchr(s, ',');
  89         bits = simple_strtoul(++s, NULL, 0);
  90         s = strchr(s, ',');
  91         parity = *(++s);
  92         s = strchr(s, ',');
  93         stop = simple_strtoul(++s, NULL, 0);
  94         s = strchr(s, ',');
  95         /* XXX handshake is not handled here. */
  96
  97         switch (baud) {
  98                 case 150: cflag |= B150; break;
  99                 case 300: cflag |= B300; break;
 100                 case 600: cflag |= B600; break;
 101                 case 1200: cflag |= B1200; break;
 102                 case 2400: cflag |= B2400; break;
 103                 case 4800: cflag |= B4800; break;
 104                 case 9600: cflag |= B9600; break;
 105                 case 19200: cflag |= B19200; break;
 106                 case 38400: cflag |= B38400; break;
 107                 case 57600: cflag |= B57600; break;
 108                 case 115200: cflag |= B115200; break;
 109                 case 230400: cflag |= B230400; break;
 110                 case 460800: cflag |= B460800; break;
 111                 default: baud = 9600; cflag |= B9600; break;
 112         }
 113
 114         switch (bits) {
 115                 case 5: cflag |= CS5; break;
 116                 case 6: cflag |= CS6; break;
 117                 case 7: cflag |= CS7; break;
 118                 case 8: cflag |= CS8; break;
 119                 default: cflag |= CS8; break;
 120         }
 121
 122         switch (parity) {
 123                 case 'o': cflag |= (PARENB | PARODD); break;
 124                 case 'e': cflag |= PARENB; break;
 125                 case 'n': default: break;
 126         }
 127
 128         switch (stop) {
 129                 case 2: cflag |= CSTOPB; break;
 130                 case 1: default: break;
 131         }
 132
 133         con->cflag = cflag;
 134 }
 135
 136 EXPORT_SYMBOL(sunserial_console_termios);
 137
 138 /* Sun serial MOUSE auto baud rate detection.  */
 139 static struct mouse_baud_cflag {
 140         int baud;
 141         unsigned int cflag;
 142 } mouse_baud_table[] = {
 143         { 1200, B1200 },
 144         { 2400, B2400 },
 145         { 4800, B4800 },
 146         { 9600, B9600 },
 147         { -1, ~0 },
 148         { -1, ~0 },
 149 };
 150
 151 unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
 152 {
 153         int i;
 154
 155         for (i = 0; mouse_baud_table[i].baud != -1; i++)
 156                 if (mouse_baud_table[i].cflag == (cflag & CBAUD))
 157                         break;
 158
 159         i += 1;
 160         if (mouse_baud_table[i].baud == -1)
 161                 i = 0;
 162
 163         *new_baud = mouse_baud_table[i].baud;
 164         return mouse_baud_table[i].cflag;
 165 }
 166
 167 EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
 168
 169 /* Basically, when the baud rate is wrong the mouse spits out
 170  * breaks to us.
 171  */
 172 int suncore_mouse_baud_detection(unsigned char ch, int is_break)
 173 {
 174         static int mouse_got_break = 0;
 175         static int ctr = 0;
 176
 177         if (is_break) {
 178                 /* Let a few normal bytes go by before we jump the gun
 179                  * and say we need to try another baud rate.
 180                  */
 181                 if (mouse_got_break && ctr < 8)
 182                         return 1;
 183
 184                 /* Ok, we need to try another baud. */
 185                 ctr = 0;
 186                 mouse_got_break = 1;
 187                 return 2;
 188         }
 189         if (mouse_got_break) {
 190                 ctr++;
 191                 if (ch == 0x87) {
 192                         /* Correct baud rate determined. */
 193                         mouse_got_break = 0;
 194                 }
 195                 return 1;
 196         }
 197         return 0;
 198 }
 199
 200 EXPORT_SYMBOL(suncore_mouse_baud_detection);
 201
 202 static int __init suncore_init(void)
 203 {
 204         return 0;
 205 }
 206
 207 static void __exit suncore_exit(void)
 208 {
 209 }
 210
 211 module_init(suncore_init);
 212 module_exit(suncore_exit);
 213
 214 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
 215 MODULE_DESCRIPTION("Sun serial common layer");
 216 MODULE_LICENSE("GPL");