Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 244 insertions, 0 deletions

diff --git a/drivers/tty/serial/suncore.c b/drivers/tty/serial/suncore.c
new file mode 100644
index 000000000..990376576
--- /dev/null
+++ b/drivers/tty/serial/suncore.c
@@ -0,0 +1,244 @@
+// SPDX-License-Identifier: GPL-2.0
+/* suncore.c
+ *
+ * Common SUN serial routines.  Based entirely
+ * upon drivers/sbus/char/sunserial.c which is:
+ *
+ * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
+ *
+ * Adaptation to new UART layer is:
+ *
+ * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/serial_core.h>
+#include <linux/sunserialcore.h>
+#include <linux/init.h>
+
+#include <asm/prom.h>
+
+
+static int sunserial_current_minor = 64;
+
+int sunserial_register_minors(struct uart_driver *drv, int count)
+{
+	int err = 0;
+
+	drv->minor = sunserial_current_minor;
+	drv->nr += count;
+	/* Register the driver on the first call */
+	if (drv->nr == count)
+		err = uart_register_driver(drv);
+	if (err == 0) {
+		sunserial_current_minor += count;
+		drv->tty_driver->name_base = drv->minor - 64;
+	}
+	return err;
+}
+EXPORT_SYMBOL(sunserial_register_minors);
+
+void sunserial_unregister_minors(struct uart_driver *drv, int count)
+{
+	drv->nr -= count;
+	sunserial_current_minor -= count;
+
+	if (drv->nr == 0)
+		uart_unregister_driver(drv);
+}
+EXPORT_SYMBOL(sunserial_unregister_minors);
+
+int sunserial_console_match(struct console *con, struct device_node *dp,
+			    struct uart_driver *drv, int line, bool ignore_line)
+{
+	if (!con)
+		return 0;
+
+	drv->cons = con;
+
+	if (of_console_device != dp)
+		return 0;
+
+	if (!ignore_line) {
+		int off = 0;
+
+		if (of_console_options &&
+		    *of_console_options == 'b')
+			off = 1;
+
+		if ((line & 1) != off)
+			return 0;
+	}
+
+	if (!console_set_on_cmdline) {
+		con->index = line;
+		add_preferred_console(con->name, line, NULL);
+	}
+	return 1;
+}
+EXPORT_SYMBOL(sunserial_console_match);
+
+void sunserial_console_termios(struct console *con, struct device_node *uart_dp)
+{
+	const char *mode, *s;
+	char mode_prop[] = "ttyX-mode";
+	int baud, bits, stop, cflag;
+	char parity;
+
+	if (!strcmp(uart_dp->name, "rsc") ||
+	    !strcmp(uart_dp->name, "rsc-console") ||
+	    !strcmp(uart_dp->name, "rsc-control")) {
+		mode = of_get_property(uart_dp,
+				       "ssp-console-modes", NULL);
+		if (!mode)
+			mode = "115200,8,n,1,-";
+	} else if (!strcmp(uart_dp->name, "lom-console")) {
+		mode = "9600,8,n,1,-";
+	} else {
+		struct device_node *dp;
+		char c;
+
+		c = 'a';
+		if (of_console_options)
+			c = *of_console_options;
+
+		mode_prop[3] = c;
+
+		dp = of_find_node_by_path("/options");
+		mode = of_get_property(dp, mode_prop, NULL);
+		if (!mode)
+			mode = "9600,8,n,1,-";
+		of_node_put(dp);
+	}
+
+	cflag = CREAD | HUPCL | CLOCAL;
+
+	s = mode;
+	baud = simple_strtoul(s, NULL, 0);
+	s = strchr(s, ',');
+	bits = simple_strtoul(++s, NULL, 0);
+	s = strchr(s, ',');
+	parity = *(++s);
+	s = strchr(s, ',');
+	stop = simple_strtoul(++s, NULL, 0);
+	s = strchr(s, ',');
+	/* XXX handshake is not handled here. */
+
+	switch (baud) {
+		case 150: cflag |= B150; break;
+		case 300: cflag |= B300; break;
+		case 600: cflag |= B600; break;
+		case 1200: cflag |= B1200; break;
+		case 2400: cflag |= B2400; break;
+		case 4800: cflag |= B4800; break;
+		case 9600: cflag |= B9600; break;
+		case 19200: cflag |= B19200; break;
+		case 38400: cflag |= B38400; break;
+		case 57600: cflag |= B57600; break;
+		case 115200: cflag |= B115200; break;
+		case 230400: cflag |= B230400; break;
+		case 460800: cflag |= B460800; break;
+		default: baud = 9600; cflag |= B9600; break;
+	}
+
+	switch (bits) {
+		case 5: cflag |= CS5; break;
+		case 6: cflag |= CS6; break;
+		case 7: cflag |= CS7; break;
+		case 8: cflag |= CS8; break;
+		default: cflag |= CS8; break;
+	}
+
+	switch (parity) {
+		case 'o': cflag |= (PARENB | PARODD); break;
+		case 'e': cflag |= PARENB; break;
+		case 'n': default: break;
+	}
+
+	switch (stop) {
+		case 2: cflag |= CSTOPB; break;
+		case 1: default: break;
+	}
+
+	con->cflag = cflag;
+}
+
+/* Sun serial MOUSE auto baud rate detection.  */
+static struct mouse_baud_cflag {
+	int baud;
+	unsigned int cflag;
+} mouse_baud_table[] = {
+	{ 1200, B1200 },
+	{ 2400, B2400 },
+	{ 4800, B4800 },
+	{ 9600, B9600 },
+	{ -1, ~0 },
+	{ -1, ~0 },
+};
+
+unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
+{
+	int i;
+
+	for (i = 0; mouse_baud_table[i].baud != -1; i++)
+		if (mouse_baud_table[i].cflag == (cflag & CBAUD))
+			break;
+
+	i += 1;
+	if (mouse_baud_table[i].baud == -1)
+		i = 0;
+
+	*new_baud = mouse_baud_table[i].baud;
+	return mouse_baud_table[i].cflag;
+}
+
+EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
+
+/* Basically, when the baud rate is wrong the mouse spits out
+ * breaks to us.
+ */
+int suncore_mouse_baud_detection(unsigned char ch, int is_break)
+{
+	static int mouse_got_break = 0;
+	static int ctr = 0;
+
+	if (is_break) {
+		/* Let a few normal bytes go by before we jump the gun
+		 * and say we need to try another baud rate.
+		 */
+		if (mouse_got_break && ctr < 8)
+			return 1;
+
+		/* Ok, we need to try another baud. */
+		ctr = 0;
+		mouse_got_break = 1;
+		return 2;
+	}
+	if (mouse_got_break) {
+		ctr++;
+		if (ch == 0x87) {
+			/* Correct baud rate determined. */
+			mouse_got_break = 0;
+		}
+		return 1;
+	}
+	return 0;
+}
+
+EXPORT_SYMBOL(suncore_mouse_baud_detection);
+
+static int __init suncore_init(void)
+{
+	return 0;
+}
+device_initcall(suncore_init);
+
+#if 0 /* ..def MODULE ; never supported as such */
+MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
+MODULE_DESCRIPTION("Sun serial common layer");
+MODULE_LICENSE("GPL");
+#endif