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 static int sunserial_current_minor = 64;
  27
  28 int sunserial_register_minors(struct uart_driver *drv, int count)
  29 {
  30         int err = 0;
  31
  32         drv->minor = sunserial_current_minor;
  33         drv->nr += count;
  34         /* Register the driver on the first call */
  35         if (drv->nr == count)
  36                 err = uart_register_driver(drv);
  37         if (err == 0) {
  38                 sunserial_current_minor += count;
  39                 drv->tty_driver->name_base = drv->minor - 64;
  40         }
  41         return err;
  42 }
  43 EXPORT_SYMBOL(sunserial_register_minors);
  44
  45 void sunserial_unregister_minors(struct uart_driver *drv, int count)
  46 {
  47         drv->nr -= count;
  48         sunserial_current_minor -= count;
  49
  50         if (drv->nr == 0)
  51                 uart_unregister_driver(drv);
  52 }
  53 EXPORT_SYMBOL(sunserial_unregister_minors);
  54
  55 int sunserial_console_match(struct console *con, struct device_node *dp,
  56                             struct uart_driver *drv, int line)
  57 {
  58         int off;
  59
  60         if (!con || of_console_device != dp)
  61                 return 0;
  62
  63         off = 0;
  64         if (of_console_options &&
  65             *of_console_options == 'b')
  66                 off = 1;
  67
  68         if ((line & 1) != off)
  69                 return 0;
  70
  71         con->index = line;
  72         drv->cons = con;
  73         add_preferred_console(con->name, line, NULL);
  74
  75         return 1;
  76 }
  77 EXPORT_SYMBOL(sunserial_console_match);
  78
  79 void
  80 sunserial_console_termios(struct console *con)
  81 {
  82         struct device_node *dp;
  83         const char *od, *mode, *s;
  84         char mode_prop[] = "ttyX-mode";
  85         int baud, bits, stop, cflag;
  86         char parity;
  87
  88         dp = of_find_node_by_path("/options");
  89         od = of_get_property(dp, "output-device", NULL);
  90         if (!strcmp(od, "rsc")) {
  91                 mode = of_get_property(of_console_device,
  92                                        "ssp-console-modes", NULL);
  93                 if (!mode)
  94                         mode = "115200,8,n,1,-";
  95         } else {
  96                 char c;
  97
  98                 c = 'a';
  99                 if (of_console_options)
 100                         c = *of_console_options;
 101
 102                 mode_prop[3] = c;
 103
 104                 mode = of_get_property(dp, mode_prop, NULL);
 105                 if (!mode)
 106                         mode = "9600,8,n,1,-";
 107         }
 108
 109         cflag = CREAD | HUPCL | CLOCAL;
 110
 111         s = mode;
 112         baud = simple_strtoul(s, NULL, 0);
 113         s = strchr(s, ',');
 114         bits = simple_strtoul(++s, NULL, 0);
 115         s = strchr(s, ',');
 116         parity = *(++s);
 117         s = strchr(s, ',');
 118         stop = simple_strtoul(++s, NULL, 0);
 119         s = strchr(s, ',');
 120         /* XXX handshake is not handled here. */
 121
 122         switch (baud) {
 123                 case 150: cflag |= B150; break;
 124                 case 300: cflag |= B300; break;
 125                 case 600: cflag |= B600; break;
 126                 case 1200: cflag |= B1200; break;
 127                 case 2400: cflag |= B2400; break;
 128                 case 4800: cflag |= B4800; break;
 129                 case 9600: cflag |= B9600; break;
 130                 case 19200: cflag |= B19200; break;
 131                 case 38400: cflag |= B38400; break;
 132                 case 57600: cflag |= B57600; break;
 133                 case 115200: cflag |= B115200; break;
 134                 case 230400: cflag |= B230400; break;
 135                 case 460800: cflag |= B460800; break;
 136                 default: baud = 9600; cflag |= B9600; break;
 137         }
 138
 139         switch (bits) {
 140                 case 5: cflag |= CS5; break;
 141                 case 6: cflag |= CS6; break;
 142                 case 7: cflag |= CS7; break;
 143                 case 8: cflag |= CS8; break;
 144                 default: cflag |= CS8; break;
 145         }
 146
 147         switch (parity) {
 148                 case 'o': cflag |= (PARENB | PARODD); break;
 149                 case 'e': cflag |= PARENB; break;
 150                 case 'n': default: break;
 151         }
 152
 153         switch (stop) {
 154                 case 2: cflag |= CSTOPB; break;
 155                 case 1: default: break;
 156         }
 157
 158         con->cflag = cflag;
 159 }
 160
 161 /* Sun serial MOUSE auto baud rate detection.  */
 162 static struct mouse_baud_cflag {
 163         int baud;
 164         unsigned int cflag;
 165 } mouse_baud_table[] = {
 166         { 1200, B1200 },
 167         { 2400, B2400 },
 168         { 4800, B4800 },
 169         { 9600, B9600 },
 170         { -1, ~0 },
 171         { -1, ~0 },
 172 };
 173
 174 unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
 175 {
 176         int i;
 177
 178         for (i = 0; mouse_baud_table[i].baud != -1; i++)
 179                 if (mouse_baud_table[i].cflag == (cflag & CBAUD))
 180                         break;
 181
 182         i += 1;
 183         if (mouse_baud_table[i].baud == -1)
 184                 i = 0;
 185
 186         *new_baud = mouse_baud_table[i].baud;
 187         return mouse_baud_table[i].cflag;
 188 }
 189
 190 EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
 191
 192 /* Basically, when the baud rate is wrong the mouse spits out
 193  * breaks to us.
 194  */
 195 int suncore_mouse_baud_detection(unsigned char ch, int is_break)
 196 {
 197         static int mouse_got_break = 0;
 198         static int ctr = 0;
 199
 200         if (is_break) {
 201                 /* Let a few normal bytes go by before we jump the gun
 202                  * and say we need to try another baud rate.
 203                  */
 204                 if (mouse_got_break && ctr < 8)
 205                         return 1;
 206
 207                 /* Ok, we need to try another baud. */
 208                 ctr = 0;
 209                 mouse_got_break = 1;
 210                 return 2;
 211         }
 212         if (mouse_got_break) {
 213                 ctr++;
 214                 if (ch == 0x87) {
 215                         /* Correct baud rate determined. */
 216                         mouse_got_break = 0;
 217                 }
 218                 return 1;
 219         }
 220         return 0;
 221 }
 222
 223 EXPORT_SYMBOL(suncore_mouse_baud_detection);
 224
 225 static int __init suncore_init(void)
 226 {
 227         return 0;
 228 }
 229
 230 static void __exit suncore_exit(void)
 231 {
 232 }
 233
 234 module_init(suncore_init);
 235 module_exit(suncore_exit);
 236
 237 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
 238 MODULE_DESCRIPTION("Sun serial common layer");
 239 MODULE_LICENSE("GPL");