// 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 (of_node_name_eq(uart_dp, "rsc") ||	    of_node_name_eq(uart_dp, "rsc-console") ||	    of_node_name_eq(uart_dp, "rsc-control")) {		mode = of_get_property(uart_dp,				       "ssp-console-modes", NULL);		if (!mode)			mode = "115200,8,n,1,-";	} else if (of_node_name_eq(uart_dp, "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