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 (!strcmp(uart_dp->name, "rsc") ||
  93            !strcmp(uart_dp->name, "rsc-console") ||
  94            !strcmp(uart_dp->name, "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 (!strcmp(uart_dp->name, "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        }
 116
 117        cflag = CREAD | HUPCL | CLOCAL;
 118
 119        s = mode;
 120        baud = simple_strtoul(s, NULL, 0);
 121        s = strchr(s, ',');
 122        bits = simple_strtoul(++s, NULL, 0);
 123        s = strchr(s, ',');
 124        parity = *(++s);
 125        s = strchr(s, ',');
 126        stop = simple_strtoul(++s, NULL, 0);
 127        s = strchr(s, ',');
 128        /* XXX handshake is not handled here. */
 129
 130        switch (baud) {
 131                case 150: cflag |= B150; break;
 132                case 300: cflag |= B300; break;
 133                case 600: cflag |= B600; break;
 134                case 1200: cflag |= B1200; break;
 135                case 2400: cflag |= B2400; break;
 136                case 4800: cflag |= B4800; break;
 137                case 9600: cflag |= B9600; break;
 138                case 19200: cflag |= B19200; break;
 139                case 38400: cflag |= B38400; break;
 140                case 57600: cflag |= B57600; break;
 141                case 115200: cflag |= B115200; break;
 142                case 230400: cflag |= B230400; break;
 143                case 460800: cflag |= B460800; break;
 144                default: baud = 9600; cflag |= B9600; break;
 145        }
 146
 147        switch (bits) {
 148                case 5: cflag |= CS5; break;
 149                case 6: cflag |= CS6; break;
 150                case 7: cflag |= CS7; break;
 151                case 8: cflag |= CS8; break;
 152                default: cflag |= CS8; break;
 153        }
 154
 155        switch (parity) {
 156                case 'o': cflag |= (PARENB | PARODD); break;
 157                case 'e': cflag |= PARENB; break;
 158                case 'n': default: break;
 159        }
 160
 161        switch (stop) {
 162                case 2: cflag |= CSTOPB; break;
 163                case 1: default: break;
 164        }
 165
 166        con->cflag = cflag;
 167}
 168
 169/* Sun serial MOUSE auto baud rate detection.  */
 170static struct mouse_baud_cflag {
 171        int baud;
 172        unsigned int cflag;
 173} mouse_baud_table[] = {
 174        { 1200, B1200 },
 175        { 2400, B2400 },
 176        { 4800, B4800 },
 177        { 9600, B9600 },
 178        { -1, ~0 },
 179        { -1, ~0 },
 180};
 181
 182unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
 183{
 184        int i;
 185
 186        for (i = 0; mouse_baud_table[i].baud != -1; i++)
 187                if (mouse_baud_table[i].cflag == (cflag & CBAUD))
 188                        break;
 189
 190        i += 1;
 191        if (mouse_baud_table[i].baud == -1)
 192                i = 0;
 193
 194        *new_baud = mouse_baud_table[i].baud;
 195        return mouse_baud_table[i].cflag;
 196}
 197
 198EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
 199
 200/* Basically, when the baud rate is wrong the mouse spits out
 201 * breaks to us.
 202 */
 203int suncore_mouse_baud_detection(unsigned char ch, int is_break)
 204{
 205        static int mouse_got_break = 0;
 206        static int ctr = 0;
 207
 208        if (is_break) {
 209                /* Let a few normal bytes go by before we jump the gun
 210                 * and say we need to try another baud rate.
 211                 */
 212                if (mouse_got_break && ctr < 8)
 213                        return 1;
 214
 215                /* Ok, we need to try another baud. */
 216                ctr = 0;
 217                mouse_got_break = 1;
 218                return 2;
 219        }
 220        if (mouse_got_break) {
 221                ctr++;
 222                if (ch == 0x87) {
 223                        /* Correct baud rate determined. */
 224                        mouse_got_break = 0;
 225                }
 226                return 1;
 227        }
 228        return 0;
 229}
 230
 231EXPORT_SYMBOL(suncore_mouse_baud_detection);
 232
 233static int __init suncore_init(void)
 234{
 235        return 0;
 236}
 237device_initcall(suncore_init);
 238
 239#if 0 /* ..def MODULE ; never supported as such */
 240MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
 241MODULE_DESCRIPTION("Sun serial common layer");
 242MODULE_LICENSE("GPL");
 243#endif
 244