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serial.c

/*
 * Generic serial console support
 *
 * Author: Mark A. Greer <mgreer@mvista.com>
 *
 * Code in serial_edit_cmdline() copied from <file:arch/ppc/boot/simple/misc.c>
 * and was written by Matt Porter <mporter@kernel.crashing.org>.
 *
 * 2001,2006 (c) MontaVista Software, Inc.  This file is licensed under
 * the terms of the GNU General Public License version 2.  This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */
#include <stdarg.h>
#include <stddef.h>
#include "types.h"
#include "string.h"
#include "stdio.h"
#include "io.h"
#include "ops.h"

static int serial_open(void)
{
      struct serial_console_data *scdp = console_ops.data;
      return scdp->open();
}

static void serial_write(const char *buf, int len)
{
      struct serial_console_data *scdp = console_ops.data;

      while (*buf != '\0')
            scdp->putc(*buf++);
}

static void serial_edit_cmdline(char *buf, int len)
{
      int timer = 0, count;
      char ch, *cp;
      struct serial_console_data *scdp = console_ops.data;

      cp = buf;
      count = strlen(buf);
      cp = &buf[count];
      count++;

      while (timer++ < 5*1000) {
            if (scdp->tstc()) {
                  while (((ch = scdp->getc()) != '\n') && (ch != '\r')) {
                        /* Test for backspace/delete */
                        if ((ch == '\b') || (ch == '\177')) {
                              if (cp != buf) {
                                    cp--;
                                    count--;
                                    printf("\b \b");
                              }
                        /* Test for ^x/^u (and wipe the line) */
                        } else if ((ch == '\030') || (ch == '\025')) {
                              while (cp != buf) {
                                    cp--;
                                    count--;
                                    printf("\b \b");
                              }
                        } else if (count < len) {
                                    *cp++ = ch;
                                    count++;
                                    scdp->putc(ch);
                        }
                  }
                  break;  /* Exit 'timer' loop */
            }
            udelay(1000);  /* 1 msec */
      }
      *cp = 0;
}

static void serial_close(void)
{
      struct serial_console_data *scdp = console_ops.data;

      if (scdp->close)
            scdp->close();
}

static void *serial_get_stdout_devp(void)
{
      void *devp;
      char devtype[MAX_PROP_LEN];
      char path[MAX_PATH_LEN];

      devp = finddevice("/chosen");
      if (devp == NULL)
            goto err_out;

      if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0) {
            devp = finddevice(path);
            if (devp == NULL)
                  goto err_out;

            if ((getprop(devp, "device_type", devtype, sizeof(devtype)) > 0)
                        && !strcmp(devtype, "serial"))
                  return devp;
      }
err_out:
      return NULL;
}

static struct serial_console_data serial_cd;

/* Node's "compatible" property determines which serial driver to use */
int serial_console_init(void)
{
      void *devp;
      int rc = -1;

      devp = serial_get_stdout_devp();
      if (devp == NULL)
            goto err_out;

      if (dt_is_compatible(devp, "ns16550"))
            rc = ns16550_console_init(devp, &serial_cd);
      else if (dt_is_compatible(devp, "marvell,mpsc"))
            rc = mpsc_console_init(devp, &serial_cd);
      else if (dt_is_compatible(devp, "fsl,cpm1-scc-uart") ||
               dt_is_compatible(devp, "fsl,cpm1-smc-uart") ||
               dt_is_compatible(devp, "fsl,cpm2-scc-uart") ||
               dt_is_compatible(devp, "fsl,cpm2-smc-uart"))
            rc = cpm_console_init(devp, &serial_cd);
      else if (dt_is_compatible(devp, "mpc5200-psc-uart"))
            rc = mpc5200_psc_console_init(devp, &serial_cd);
      else if (dt_is_compatible(devp, "xilinx,uartlite"))
            rc = uartlite_console_init(devp, &serial_cd);

      /* Add other serial console driver calls here */

      if (!rc) {
            console_ops.open = serial_open;
            console_ops.write = serial_write;
            console_ops.close = serial_close;
            console_ops.data = &serial_cd;

            if (serial_cd.getc)
                  console_ops.edit_cmdline = serial_edit_cmdline;

            return 0;
      }
err_out:
      return -1;
}

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