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* Generic serial console support
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* Author: Mark A. Greer <mgreer@mvista.com>
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* Code in serial_edit_cmdline() copied from <file:arch/ppc/boot/simple/misc.c>
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* and was written by Matt Porter <mporter@kernel.crashing.org>.
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* 2001,2006 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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static int serial_open(void)
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struct serial_console_data *scdp = console_ops.data;
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static void serial_write(const char *buf, int len)
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struct serial_console_data *scdp = console_ops.data;
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static void serial_edit_cmdline(char *buf, int len)
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struct serial_console_data *scdp = console_ops.data;
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while (timer++ < 5*1000) {
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while (((ch = scdp->getc()) != '\n') && (ch != '\r')) {
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/* Test for backspace/delete */
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if ((ch == '\b') || (ch == '\177')) {
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/* Test for ^x/^u (and wipe the line) */
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} else if ((ch == '\030') || (ch == '\025')) {
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} else if (count < len) {
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break; /* Exit 'timer' loop */
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udelay(1000); /* 1 msec */
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static void serial_close(void)
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struct serial_console_data *scdp = console_ops.data;
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static void *serial_get_stdout_devp(void)
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char devtype[MAX_PROP_LEN];
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char path[MAX_PATH_LEN];
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devp = finddevice("/chosen");
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if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0) {
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devp = finddevice(path);
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if ((getprop(devp, "device_type", devtype, sizeof(devtype)) > 0)
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&& !strcmp(devtype, "serial"))
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static struct serial_console_data serial_cd;
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/* Node's "compatible" property determines which serial driver to use */
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int serial_console_init(void)
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devp = serial_get_stdout_devp();
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if (dt_is_compatible(devp, "ns16550") ||
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dt_is_compatible(devp, "pnpPNP,501"))
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rc = ns16550_console_init(devp, &serial_cd);
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else if (dt_is_compatible(devp, "marvell,mv64360-mpsc"))
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rc = mpsc_console_init(devp, &serial_cd);
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else if (dt_is_compatible(devp, "fsl,cpm1-scc-uart") ||
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dt_is_compatible(devp, "fsl,cpm1-smc-uart") ||
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dt_is_compatible(devp, "fsl,cpm2-scc-uart") ||
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dt_is_compatible(devp, "fsl,cpm2-smc-uart"))
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rc = cpm_console_init(devp, &serial_cd);
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else if (dt_is_compatible(devp, "fsl,mpc5200-psc-uart"))
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rc = mpc5200_psc_console_init(devp, &serial_cd);
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else if (dt_is_compatible(devp, "xlnx,opb-uartlite-1.00.b") ||
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dt_is_compatible(devp, "xlnx,xps-uartlite-1.00.a"))
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rc = uartlite_console_init(devp, &serial_cd);
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/* Add other serial console driver calls here */
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console_ops.open = serial_open;
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console_ops.write = serial_write;
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console_ops.close = serial_close;
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console_ops.data = &serial_cd;
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console_ops.edit_cmdline = serial_edit_cmdline;