drivers/tty/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/kernel.h>
  14 #include <linux/console.h>
  15 #include <linux/tty.h>
  16 #include <linux/errno.h>
  17 #include <linux/string.h>
  18 #include <linux/serial_core.h>
  19 #include <linux/sunserialcore.h>
  20 #include <linux/init.h>
  21
  22 #include <asm/prom.h>
  23
  24
  25 static int sunserial_current_minor = 64;
  26
  27 int sunserial_register_minors(struct uart_driver *drv, int count)
  28 {
  29         int err = 0;
  30
  31         drv->minor = sunserial_current_minor;
  32         drv->nr += count;
  33         /* Register the driver on the first call */
  34         if (drv->nr == count)
  35                 err = uart_register_driver(drv);
  36         if (err == 0) {
  37                 sunserial_current_minor += count;
  38                 drv->tty_driver->name_base = drv->minor - 64;
  39         }
  40         return err;
  41 }
  42 EXPORT_SYMBOL(sunserial_register_minors);
  43
  44 void sunserial_unregister_minors(struct uart_driver *drv, int count)
  45 {
  46         drv->nr -= count;
  47         sunserial_current_minor -= count;
  48
  49         if (drv->nr == 0)
  50                 uart_unregister_driver(drv);
  51 }
  52 EXPORT_SYMBOL(sunserial_unregister_minors);
  53
  54 int sunserial_console_match(struct console *con, struct device_node *dp,
  55                             struct uart_driver *drv, int line, bool ignore_line)
  56 {
  57         if (!con)
  58                 return 0;
  59
  60         drv->cons = con;
  61
  62         if (of_console_device != dp)
  63                 return 0;
  64
  65         if (!ignore_line) {
  66                 int off = 0;
  67
  68                 if (of_console_options &&
  69                     *of_console_options == 'b')
  70                         off = 1;
  71
  72                 if ((line & 1) != off)
  73                         return 0;
  74         }
  75
  76         if (!console_set_on_cmdline) {
  77                 con->index = line;
  78                 add_preferred_console(con->name, line, NULL);
  79         }
  80         return 1;
  81 }
  82 EXPORT_SYMBOL(sunserial_console_match);
  83
  84 void sunserial_console_termios(struct console *con, struct device_node *uart_dp)
  85 {
  86         const char *mode, *s;
  87         char mode_prop[] = "ttyX-mode";
  88         int baud, bits, stop, cflag;
  89         char parity;
  90
  91         if (!strcmp(uart_dp->name, "rsc") ||
  92             !strcmp(uart_dp->name, "rsc-console") ||
  93             !strcmp(uart_dp->name, "rsc-control")) {
  94                 mode = of_get_property(uart_dp,
  95                                        "ssp-console-modes", NULL);
  96                 if (!mode)
  97                         mode = "115200,8,n,1,-";
  98         } else if (!strcmp(uart_dp->name, "lom-console")) {
  99                 mode = "9600,8,n,1,-";
 100         } else {
 101                 struct device_node *dp;
 102                 char c;
 103
 104                 c = 'a';
 105                 if (of_console_options)
 106                         c = *of_console_options;
 107
 108                 mode_prop[3] = c;
 109
 110                 dp = of_find_node_by_path("/options");
 111                 mode = of_get_property(dp, mode_prop, NULL);
 112                 if (!mode)
 113                         mode = "9600,8,n,1,-";
 114         }
 115
 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 /* Sun serial MOUSE auto baud rate detection.  */
 169 static struct mouse_baud_cflag {
 170         int baud;
 171         unsigned int cflag;
 172 } mouse_baud_table[] = {
 173         { 1200, B1200 },
 174         { 2400, B2400 },
 175         { 4800, B4800 },
 176         { 9600, B9600 },
 177         { -1, ~0 },
 178         { -1, ~0 },
 179 };
 180
 181 unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
 182 {
 183         int i;
 184
 185         for (i = 0; mouse_baud_table[i].baud != -1; i++)
 186                 if (mouse_baud_table[i].cflag == (cflag & CBAUD))
 187                         break;
 188
 189         i += 1;
 190         if (mouse_baud_table[i].baud == -1)
 191                 i = 0;
 192
 193         *new_baud = mouse_baud_table[i].baud;
 194         return mouse_baud_table[i].cflag;
 195 }
 196
 197 EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
 198
 199 /* Basically, when the baud rate is wrong the mouse spits out
 200  * breaks to us.
 201  */
 202 int suncore_mouse_baud_detection(unsigned char ch, int is_break)
 203 {
 204         static int mouse_got_break = 0;
 205         static int ctr = 0;
 206
 207         if (is_break) {
 208                 /* Let a few normal bytes go by before we jump the gun
 209                  * and say we need to try another baud rate.
 210                  */
 211                 if (mouse_got_break && ctr < 8)
 212                         return 1;
 213
 214                 /* Ok, we need to try another baud. */
 215                 ctr = 0;
 216                 mouse_got_break = 1;
 217                 return 2;
 218         }
 219         if (mouse_got_break) {
 220                 ctr++;
 221                 if (ch == 0x87) {
 222                         /* Correct baud rate determined. */
 223                         mouse_got_break = 0;
 224                 }
 225                 return 1;
 226         }
 227         return 0;
 228 }
 229
 230 EXPORT_SYMBOL(suncore_mouse_baud_detection);
 231
 232 static int __init suncore_init(void)
 233 {
 234         return 0;
 235 }
 236 device_initcall(suncore_init);
 237
 238 #if 0 /* ..def MODULE ; never supported as such */
 239 MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
 240 MODULE_DESCRIPTION("Sun serial common layer");
 241 MODULE_LICENSE("GPL");
 242 #endif