LXR linux/drivers/tty/serial/suncore.c

   1// SPDX-License-Identifier: GPL-2.0
   2/* suncore.c
   3 *
   4 * Common SUN serial routines.  Based entirely
   5 * upon drivers/sbus/char/sunserial.c which is:
   6 *
   7 * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
   8 *
   9 * Adaptation to new UART layer is:
  10 *
  11 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
  12 */
  13
  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/sunserialcore.h>
  21#include <linux/init.h>
  22
  23#include <asm/prom.h>
  24
  25
  26static int sunserial_current_minor = 64;
  27
  28int 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}
  43EXPORT_SYMBOL(sunserial_register_minors);
  44
  45void 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}
  53EXPORT_SYMBOL(sunserial_unregister_minors);
  54
  55int sunserial_console_match(struct console *con, struct device_node *dp,
  56                            struct uart_driver *drv, int line, bool ignore_line)
  57{
  58        if (!con)
  59                return 0;
  60
  61        drv->cons = con;
  62
  63        if (of_console_device != dp)
  64                return 0;
  65
  66        if (!ignore_line) {
  67                int off = 0;
  68
  69                if (of_console_options &&
  70                    *of_console_options == 'b')
  71                        off = 1;
  72
  73                if ((line & 1) != off)
  74                        return 0;
  75        }
  76
  77        if (!console_set_on_cmdline) {
  78                con->index = line;
  79                add_preferred_console(con->name, line, NULL);
  80        }
  81        return 1;
  82}
  83EXPORT_SYMBOL(sunserial_console_match);
  84
  85void sunserial_console_termios(struct console *con, struct device_node *uart_dp)
  86{
  87        const char *mode, *s;
  88        char mode_prop[] = "ttyX-mode";
  89        int baud, bits, stop, cflag;
  90        char parity;
  91
  92        if (of_node_name_eq(uart_dp, "rsc") ||
  93            of_node_name_eq(uart_dp, "rsc-console") ||
  94            of_node_name_eq(uart_dp, "rsc-control")) {
  95                mode = of_get_property(uart_dp,
  96                                       "ssp-console-modes", NULL);
  97                if (!mode)
  98                        mode = "115200,8,n,1,-";
  99        } else if (of_node_name_eq(uart_dp, "lom-console")) {
 100                mode = "9600,8,n,1,-";
 101        } else {
 102                struct device_node *dp;
 103                char c;
 104
 105                c = 'a';
 106                if (of_console_options)
 107                        c = *of_console_options;
 108
 109                mode_prop[3] = c;
 110
 111                dp = of_find_node_by_path("/options");
 112                mode = of_get_property(dp, mode_prop, NULL);
 113                if (!mode)
 114                        mode = "9600,8,n,1,-";
 115                of_node_put(dp);
 116        }
 117
 118        cflag = CREAD | HUPCL | CLOCAL;
 119
 120        s = mode;
 121        baud = simple_strtoul(s, NULL, 0);
 122        s = strchr(s, ',');
 123        bits = simple_strtoul(++s, NULL, 0);
 124        s = strchr(s, ',');
 125        parity = *(++s);
 126        s = strchr(s, ',');
 127        stop = simple_strtoul(++s, NULL, 0);
 128        s = strchr(s, ',');
 129        /* XXX handshake is not handled here. */
 130
 131        switch (baud) {
 132                case 150: cflag |= B150; break;
 133                case 300: cflag |= B300; break;
 134                case 600: cflag |= B600; break;
 135                case 1200: cflag |= B1200; break;
 136                case 2400: cflag |= B2400; break;
 137                case 4800: cflag |= B4800; break;
 138                case 9600: cflag |= B9600; break;
 139                case 19200: cflag |= B19200; break;
 140                case 38400: cflag |= B38400; break;
 141                case 57600: cflag |= B57600; break;
 142                case 115200: cflag |= B115200; break;
 143                case 230400: cflag |= B230400; break;
 144                case 460800: cflag |= B460800; break;
 145                default: baud = 9600; cflag |= B9600; break;
 146        }
 147
 148        switch (bits) {
 149                case 5: cflag |= CS5; break;
 150                case 6: cflag |= CS6; break;
 151                case 7: cflag |= CS7; break;
 152                case 8: cflag |= CS8; break;
 153                default: cflag |= CS8; break;
 154        }
 155
 156        switch (parity) {
 157                case 'o': cflag |= (PARENB | PARODD); break;
 158                case 'e': cflag |= PARENB; break;
 159                case 'n': default: break;
 160        }
 161
 162        switch (stop) {
 163                case 2: cflag |= CSTOPB; break;
 164                case 1: default: break;
 165        }
 166
 167        con->cflag = cflag;
 168}
 169
 170/* Sun serial MOUSE auto baud rate detection.  */
 171static 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
 183unsigned 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
 199EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
 200
 201/* Basically, when the baud rate is wrong the mouse spits out
 202 * breaks to us.
 203 */
 204int 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
 232EXPORT_SYMBOL(suncore_mouse_baud_detection);
 233
 234static int __init suncore_init(void)
 235{
 236        return 0;
 237}
 238device_initcall(suncore_init);
 239
 240#if 0 /* ..def MODULE ; never supported as such */
 241MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
 242MODULE_DESCRIPTION("Sun serial common layer");
 243MODULE_LICENSE("GPL");
 244#endif
 245