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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0c176fa80f
Add serial console support for non-OF systems. There is a generic serial console layer which calls a serial console driver. Included is the serial console driver for the ns16550 class of uarts. Necessary support routines are added as well. Signed-off-by: Mark A. Greer <mgreer@mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
143 lines
3.0 KiB
C
143 lines
3.0 KiB
C
/*
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* Generic serial console support
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*
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* Author: Mark A. Greer <mgreer@mvista.com>
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*
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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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*
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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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* or implied.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include "types.h"
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#include "string.h"
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#include "stdio.h"
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#include "io.h"
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#include "ops.h"
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extern void udelay(long delay);
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static int serial_open(void)
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{
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struct serial_console_data *scdp = console_ops.data;
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return scdp->open();
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}
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static void serial_write(char *buf, int len)
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{
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struct serial_console_data *scdp = console_ops.data;
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while (*buf != '\0')
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scdp->putc(*buf++);
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}
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static void serial_edit_cmdline(char *buf, int len)
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{
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int timer = 0, count;
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char ch, *cp;
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struct serial_console_data *scdp = console_ops.data;
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cp = buf;
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count = strlen(buf);
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cp = &buf[count];
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count++;
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while (timer++ < 5*1000) {
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if (scdp->tstc()) {
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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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if (cp != buf) {
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cp--;
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count--;
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printf("\b \b");
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}
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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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while (cp != buf) {
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cp--;
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count--;
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printf("\b \b");
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}
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} else if (count < len) {
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*cp++ = ch;
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count++;
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scdp->putc(ch);
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}
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}
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break; /* Exit 'timer' loop */
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}
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udelay(1000); /* 1 msec */
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}
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*cp = 0;
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}
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static void serial_close(void)
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{
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struct serial_console_data *scdp = console_ops.data;
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if (scdp->close)
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scdp->close();
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}
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static void *serial_get_stdout_devp(void)
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{
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void *devp;
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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 (devp == NULL)
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goto err_out;
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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 (devp == NULL)
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goto err_out;
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if ((getprop(devp, "device_type", devtype, sizeof(devtype)) > 0)
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&& !strcmp(devtype, "serial"))
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return devp;
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}
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err_out:
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return NULL;
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}
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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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{
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void *devp;
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int rc = -1;
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char compat[MAX_PROP_LEN];
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devp = serial_get_stdout_devp();
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if (devp == NULL)
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goto err_out;
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if (getprop(devp, "compatible", compat, sizeof(compat)) < 0)
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goto err_out;
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if (!strcmp(compat, "ns16550"))
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rc = ns16550_console_init(devp, &serial_cd);
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/* Add other serial console driver calls here */
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if (!rc) {
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console_ops.open = serial_open;
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console_ops.write = serial_write;
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console_ops.edit_cmdline = serial_edit_cmdline;
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console_ops.close = serial_close;
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console_ops.data = &serial_cd;
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return 0;
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}
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err_out:
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return -1;
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}
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