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