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32 results

suncore.c

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  • suncore.c 5.23 KiB
    // 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