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, bool ignore_line)
  57 {
  58         if (!con || of_console_device != dp)
  59                 return 0;
  60
  61         if (!ignore_line) {
  62                 int off = 0;
  63
  64                 if (of_console_options &&
  65                     *of_console_options == 'b')
  66                         off = 1;
  67
  68                 if ((line & 1) != off)
  69                         return 0;
  70         }
  71
  72         con->index = line;
  73         drv->cons = con;
  74
  75         if (!console_set_on_cmdline)
  76                 add_preferred_console(con->name, line, NULL);
  77
  78         return 1;
  79 }
  80 EXPORT_SYMBOL(sunserial_console_match);
  81
  82 void sunserial_console_termios(struct console *con, struct device_node *uart_dp)
  83 {
  84         const char *mode, *s;
  85         char mode_prop[] = "ttyX-mode";
  86         int baud, bits, stop, cflag;
  87         char parity;
  88
  89         if (!strcmp(uart_dp->name, "rsc") ||
  90             !strcmp(uart_dp->name, "rsc-console") ||
  91             !strcmp(uart_dp->name, "rsc-control")) {
  92                 mode = of_get_property(uart_dp,
  93                                        "ssp-console-modes", NULL);
  94                 if (!mode)
  95                         mode = "115200,8,n,1,-";
  96         } else if (!strcmp(uart_dp->name, "lom-console")) {
  97                 mode = "9600,8,n,1,-";
  98         } else {
  99                 struct device_node *dp;
 100                 char c;
 101
 102                 c = 'a';
 103                 if (of_console_options)
 104                         c = *of_console_options;
 105
 106                 mode_prop[3] = c;
 107
 108                 dp = of_find_node_by_path("/options");
 109                 mode = of_get_property(dp, mode_prop, NULL);
 110                 if (!mode)
 111                         mode = "9600,8,n,1,-";
 112         }
 113
 114         cflag = CREAD | HUPCL | CLOCAL;
 115
 116         s = mode;
 117         baud = simple_strtoul(s, NULL, 0);
 118         s = strchr(s, ',');
 119         bits = simple_strtoul(++s, NULL, 0);
 120         s = strchr(s, ',');
 121         parity = *(++s);
 122         s = strchr(s, ',');
 123         stop = simple_strtoul(++s, NULL, 0);
 124         s = strchr(s, ',');
 125         /* XXX handshake is not handled here. */
 126
 127         switch (baud) {
 128                 case 150: cflag |= B150; break;
 129                 case 300: cflag |= B300; break;
 130                 case 600: cflag |= B600; break;
 131                 case 1200: cflag |= B1200; break;
 132                 case 2400: cflag |= B2400; break;
 133                 case 4800: cflag |= B4800; break;
 134                 case 9600: cflag |= B9600; break;
 135                 case 19200: cflag |= B19200; break;
 136                 case 38400: cflag |= B38400; break;
 137                 case 57600: cflag |= B57600; break;
 138                 case 115200: cflag |= B115200; break;
 139                 case 230400: cflag |= B230400; break;
 140                 case 460800: cflag |= B460800; break;
 141                 default: baud = 9600; cflag |= B9600; break;
 142         }
 143
 144         switch (bits) {
 145                 case 5: cflag |= CS5; break;
 146                 case 6: cflag |= CS6; break;
 147                 case 7: cflag |= CS7; break;
 148                 case 8: cflag |= CS8; break;
 149                 default: cflag |= CS8; break;
 150         }
 151
 152         switch (parity) {
 153                 case 'o': cflag |= (PARENB | PARODD); break;
 154                 case 'e': cflag |= PARENB; break;
 155                 case 'n': default: break;
 156         }
 157
 158         switch (stop) {
 159                 case 2: cflag |= CSTOPB; break;
 160                 case 1: default: break;
 161         }
 162
 163         con->cflag = cflag;
 164 }
 165
 166 /* Sun serial MOUSE auto baud rate detection.  */
 167 static struct mouse_baud_cflag {
 168         int baud;
 169         unsigned int cflag;
 170 } mouse_baud_table[] = {
 171         { 1200, B1200 },
 172         { 2400, B2400 },
 173         { 4800, B4800 },
 174         { 9600, B9600 },
 175         { -1, ~0 },
 176         { -1, ~0 },
 177 };
 178
 179 unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
 180 {
 181         int i;
 182
 183         for (i = 0; mouse_baud_table[i].baud != -1; i++)
 184                 if (mouse_baud_table[i].cflag == (cflag & CBAUD))
 185                         break;
 186
 187         i += 1;
 188         if (mouse_baud_table[i].baud == -1)
 189                 i = 0;
 190
 191         *new_baud = mouse_baud_table[i].baud;
 192         return mouse_baud_table[i].cflag;
 193 }
 194
 195 EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
 196
 197 /* Basically, when the baud rate is wrong the mouse spits out
 198  * breaks to us.
 199  */
 200 int suncore_mouse_baud_detection(unsigned char ch, int is_break)
 201 {
 202         static int mouse_got_break = 0;
 203         static int ctr = 0;
 204
 205         if (is_break) {
 206                 /* Let a few normal bytes go by before we jump the gun
 207                  * and say we need to try another baud rate.
 208                  */
 209                 if (mouse_got_break && ctr < 8)
 210                         return 1;
 211
 212                 /* Ok, we need to try another baud. */
 213                 ctr = 0;
 214                 mouse_got_break = 1;
 215                 return 2;
 216         }
 217         if (mouse_got_break) {
 218                 ctr++;
 219                 if (ch == 0x87) {
 220                         /* Correct baud rate determined. */
 221                         mouse_got_break = 0;
 222                 }
 223                 return 1;
 224         }
 225         return 0;
 226 }
 227
 228 EXPORT_SYMBOL(suncore_mouse_baud_detection);
 229
 230 static int __init suncore_init(void)
 231 {
 232         return 0;
 233 }
 234
 235 static void __exit suncore_exit(void)
 236 {
 237 }
 238
 239 module_init(suncore_init);
 240 module_exit(suncore_exit);
 241
 242 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
 243 MODULE_DESCRIPTION("Sun serial common layer");
 244 MODULE_LICENSE("GPL");