v4.19.13 snapshot.
diff --git a/arch/powerpc/boot/serial.c b/arch/powerpc/boot/serial.c
new file mode 100644
index 0000000..48e3743
--- /dev/null
+++ b/arch/powerpc/boot/serial.c
@@ -0,0 +1,159 @@
+/*
+ * 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, unsigned int timeout)
+{
+ int timer = 0, count;
+ char ch, *cp;
+ struct serial_console_data *scdp = console_ops.data;
+
+ cp = buf;
+ count = strlen(buf);
+ cp = &buf[count];
+ count++;
+
+ do {
+ 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 */
+ } while (timer++ < timeout);
+ *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") ||
+ dt_is_compatible(devp, "pnpPNP,501"))
+ rc = ns16550_console_init(devp, &serial_cd);
+#ifdef CONFIG_CPM
+ 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);
+#endif
+#ifdef CONFIG_PPC_MPC52XX
+ else if (dt_is_compatible(devp, "fsl,mpc5200-psc-uart"))
+ rc = mpc5200_psc_console_init(devp, &serial_cd);
+#endif
+#ifdef CONFIG_XILINX_VIRTEX
+ else if (dt_is_compatible(devp, "xlnx,opb-uartlite-1.00.b") ||
+ dt_is_compatible(devp, "xlnx,xps-uartlite-1.00.a"))
+ rc = uartlite_console_init(devp, &serial_cd);
+#endif
+#ifdef CONFIG_PPC64_BOOT_WRAPPER
+ else if (dt_is_compatible(devp, "ibm,opal-console-raw"))
+ rc = opal_console_init(devp, &serial_cd);
+#endif
+
+ /* 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;
+}