patch-2.2.11 linux/drivers/char/dz.c
Next file: linux/drivers/char/dz.h
Previous file: linux/drivers/char/cyclades.c
Back to the patch index
Back to the overall index
- Lines: 1602
- Date:
Mon Aug 9 12:04:39 1999
- Orig file:
v2.2.10/linux/drivers/char/dz.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.2.10/linux/drivers/char/dz.c linux/drivers/char/dz.c
@@ -0,0 +1,1601 @@
+/*
+ * dz.c: Serial port driver for DECStations equiped
+ * with the DZ chipset.
+ *
+ * Copyright (C) 1998 Olivier A. D. Lebaillif
+ *
+ * Email: olivier.lebaillif@ifrsys.com
+ *
+ * [31-AUG-98] triemer
+ * Changed IRQ to use Harald's dec internals interrupts.h
+ * removed base_addr code - moving address assignment to setup.c
+ * Changed name of dz_init to rs_init to be consistent with tc code
+ * [13-NOV-98] triemer fixed code to receive characters
+ * after patches by harald to irq code.
+ * [09-JAN-99] triemer minor fix for schedule - due to removal of timeout
+ * field from "current" - somewhere between 2.1.121 and 2.1.131
+ */
+
+#ifdef MODULE
+#include <linux/module.h>
+#include <linux/version.h>
+#else
+#define MOD_INC_USE_COUNT
+#define MOD_DEC_USE_COUNT
+#endif
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/malloc.h>
+#include <linux/mm.h>
+#include <linux/major.h>
+#include <linux/param.h>
+#include <linux/tqueue.h>
+#include <linux/interrupt.h>
+#include <asm-mips/wbflush.h>
+/* for definition of SERIAL */
+#include <asm/dec/interrupts.h>
+
+/* for definition of struct console */
+#ifdef CONFIG_SERIAL_CONSOLE
+#define CONSOLE_LINE (3)
+#include <linux/console.h>
+#endif /* ifdef CONFIG_SERIAL_CONSOLE */
+
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+
+#include <asm/uaccess.h>
+#include <asm/irq.h>
+#include <asm/dec/machtype.h>
+#include <asm/dec/kn01.h>
+#include <asm/dec/kn02.h>
+
+#define DEBUG_DZ 1
+#ifdef DEBUG_DZ
+#include <linux/tty.h>
+#include <linux/major.h>
+#include <linux/ptrace.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/fs.h>
+#include <asm/bootinfo.h>
+
+extern int (*prom_printf) (char *,...);
+#endif
+
+
+
+#include "dz.h"
+
+#define DZ_INTR_DEBUG 1
+
+DECLARE_TASK_QUEUE(tq_serial);
+
+extern struct wait_queue *keypress_wait;
+static struct dz_serial *lines[4];
+static unsigned char tmp_buffer[256];
+
+
+
+#ifdef DEBUG_DZ
+/*
+ * debugging code to send out chars via prom
+ */
+static void debug_console( const char *s,int count)
+{
+ unsigned i;
+
+ for (i = 0; i < count; i++) {
+ if (*s == 10)
+ prom_printf("%c", 13);
+ prom_printf("%c", *s++);
+ }
+}
+#endif
+
+/*
+ * ------------------------------------------------------------
+ * dz_in () and dz_out ()
+ *
+ * These routines are used to access the registers of the DZ
+ * chip, hiding relocation differences between implementation.
+ * ------------------------------------------------------------
+ */
+
+static inline unsigned short dz_in (struct dz_serial *info, unsigned offset)
+{
+ volatile unsigned short *addr = (volatile unsigned short *)(info->port + offset);
+ return *addr;
+}
+
+static inline void dz_out (struct dz_serial *info, unsigned offset, unsigned short value)
+{
+
+ volatile unsigned short *addr = (volatile unsigned short *)(info->port + offset);
+ *addr = value;
+
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop () and rs_start ()
+ *
+ * These routines are called before setting or resetting
+ * tty->stopped. They enable or disable transmitter interrupts,
+ * as necessary.
+ * ------------------------------------------------------------
+ */
+
+static void dz_stop (struct tty_struct *tty)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+ unsigned short mask, tmp;
+
+
+ mask = 1 << info->line;
+ tmp = dz_in (info, DZ_TCR); /* read the TX flag */
+
+ tmp &= ~mask; /* clear the TX flag */
+ dz_out (info, DZ_TCR, tmp);
+}
+
+static void dz_start (struct tty_struct *tty)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+ unsigned short mask, tmp;
+
+ mask = 1 << info->line;
+ tmp = dz_in (info, DZ_TCR); /* read the TX flag */
+
+ tmp |= mask; /* set the TX flag */
+ dz_out (info, DZ_TCR, tmp);
+
+}
+
+/*
+ * ------------------------------------------------------------
+ * Here starts the interrupt handling routines. All of the
+ * following subroutines are declared as inline and are folded
+ * into dz_interrupt. They were separated out for readability's
+ * sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off. People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible. After you are done making modifications, it is not a bad
+ * idea to do:
+ *
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer dz.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ * ------------------------------------------------------------
+ */
+
+/*
+ * ------------------------------------------------------------
+ * dz_sched_event ()
+ *
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ * ------------------------------------------------------------
+ */
+static inline void dz_sched_event (struct dz_serial *info, int event)
+{
+ info->event |= 1 << event;
+ queue_task (&info->tqueue, &tq_serial);
+ mark_bh (SERIAL_BH);
+}
+
+/*
+ * ------------------------------------------------------------
+ * receive_char ()
+ *
+ * This routine deals with inputs from any lines.
+ * ------------------------------------------------------------
+ */
+static inline void receive_chars (struct dz_serial *info_in)
+{
+
+ struct dz_serial *info;
+ struct tty_struct *tty = 0;
+ struct async_icount *icount;
+ int ignore = 0;
+ unsigned short status, tmp;
+ unsigned char ch;
+
+ /* this code is going to be a problem...
+ the call to tty_flip_buffer is going to need
+ to be rethought...
+ */
+ do
+ {
+ status = dz_in (info_in, DZ_RBUF);
+ info = lines[LINE(status)];
+
+ /* punt so we don't get duplicate characters */
+ if (!(status & DZ_DVAL))
+ goto ignore_char;
+
+
+ ch = UCHAR(status); /* grab the char */
+
+#ifdef 0
+ if (info->is_console) {
+ if (ch == 0) return; /* it's a break ... */
+
+ wake_up (&keypress_wait); /* It is a 'keyboard interrupt' ;-) */
+ }
+#endif
+
+ tty = info->tty; /* now tty points to the proper dev */
+ icount = &info->icount;
+
+ if (!tty) break;
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE) break;
+
+ *tty->flip.char_buf_ptr = ch;
+ *tty->flip.flag_buf_ptr = 0;
+ icount->rx++;
+
+ /* keep track of the statistics */
+ if (status & (DZ_OERR | DZ_FERR | DZ_PERR)) {
+ if (status & DZ_PERR) /* parity error */
+ icount->parity++;
+ else if (status & DZ_FERR) /* frame error */
+ icount->frame++;
+ if (status & DZ_OERR) /* overrun error */
+ icount->overrun++;
+
+ /* check to see if we should ignore the character
+ and mask off conditions that should be ignored
+ */
+
+ if (status & info->ignore_status_mask) {
+ if (++ignore > 100 ) break;
+ goto ignore_char;
+ }
+
+ /* mask off the error conditions we want to ignore */
+ tmp = status & info->read_status_mask;
+
+ if (tmp & DZ_PERR)
+ {
+ *tty->flip.flag_buf_ptr = TTY_PARITY;
+ debug_console("PERR\n",5);
+ }
+ else if (tmp & DZ_FERR)
+ {
+ *tty->flip.flag_buf_ptr = TTY_FRAME;
+ debug_console("FERR\n",5);
+ }
+ if (tmp & DZ_OERR)
+ {
+ debug_console("OERR\n",5);
+ if (tty->flip.count < TTY_FLIPBUF_SIZE) {
+ tty->flip.count++;
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ *tty->flip.flag_buf_ptr = TTY_OVERRUN;
+ }
+ }
+ }
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ tty->flip.count++;
+ ignore_char:
+ } while (status & DZ_DVAL);
+
+ if (tty)
+ tty_flip_buffer_push(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * transmit_char ()
+ *
+ * This routine deals with outputs to any lines.
+ * ------------------------------------------------------------
+ */
+static inline void transmit_chars (struct dz_serial *info)
+{
+ unsigned char tmp;
+
+
+
+ if (info->x_char) { /* XON/XOFF chars */
+ dz_out (info, DZ_TDR, info->x_char);
+ info->icount.tx++;
+ info->x_char = 0;
+ return;
+ }
+
+ /* if nothing to do or stopped or hardware stopped */
+ if ((info->xmit_cnt <= 0) || info->tty->stopped || info->tty->hw_stopped) {
+ dz_stop (info->tty);
+ return;
+ }
+
+ /* if something to do ... (rember the dz has no output fifo so we go one char at a time :-< */
+ tmp = (unsigned short)info->xmit_buf[info->xmit_tail++];
+ dz_out (info, DZ_TDR, tmp);
+ info->xmit_tail = info->xmit_tail & (DZ_XMIT_SIZE - 1);
+ info->icount.tx++;
+
+ if (--info->xmit_cnt < WAKEUP_CHARS)
+ dz_sched_event (info, DZ_EVENT_WRITE_WAKEUP);
+
+
+ /* Are we done */
+ if (info->xmit_cnt <= 0) dz_stop (info->tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * check_modem_status ()
+ *
+ * Only valid for the MODEM line duh !
+ * ------------------------------------------------------------
+ */
+static inline void check_modem_status (struct dz_serial *info)
+{
+ unsigned short status;
+
+ /* if not ne modem line just return */
+ if (info->line != DZ_MODEM) return;
+
+ status = dz_in (info, DZ_MSR);
+
+ /* it's easy, since DSR2 is the only bit in the register */
+ if (status) info->icount.dsr++;
+}
+
+/*
+ * ------------------------------------------------------------
+ * dz_interrupt ()
+ *
+ * this is the main interrupt routine for the DZ chip.
+ * It deals with the multiple ports.
+ * ------------------------------------------------------------
+ */
+static void dz_interrupt (int irq, void *dev, struct pt_regs *regs)
+{
+ struct dz_serial *info;
+ unsigned short status;
+
+ status = dz_in ((struct dz_serial *)dev, DZ_CSR); /* get the reason why we just got an irq */
+ info = lines[LINE(status)]; /* re-arrange info the proper port */
+
+ if (status & DZ_RDONE)
+ receive_chars (info); /* the receive function */
+
+ if (status & DZ_TRDY)
+ transmit_chars (info);
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the DZ interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used to handle the "bottom half" processing for the
+ * serial driver, known also the "software interrupt" processing.
+ * This processing is done at the kernel interrupt level, after the
+ * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
+ * is where time-consuming activities which can not be done in the
+ * interrupt driver proper are done; the interrupt driver schedules
+ * them using rs_sched_event(), and they get done here.
+ */
+static void do_serial_bh (void)
+{
+ run_task_queue (&tq_serial);
+}
+
+static void do_softint (void *private_data)
+{
+ struct dz_serial *info = (struct dz_serial *)private_data;
+ struct tty_struct *tty = info->tty;
+
+ if (!tty) return;
+
+ if (test_and_clear_bit (DZ_EVENT_WRITE_WAKEUP, &info->event)) {
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup)
+ (tty->ldisc.write_wakeup) (tty);
+ wake_up_interruptible (&tty->write_wait);
+ }
+}
+
+/*
+ * -------------------------------------------------------------------
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred. The path of
+ * hangup processing is:
+ *
+ * serial interrupt routine -> (scheduler tqueue) ->
+ * do_serial_hangup() -> tty->hangup() -> rs_hangup()
+ * -------------------------------------------------------------------
+ */
+static void do_serial_hangup (void *private_data)
+{
+ struct dz_serial *info = (struct dz_serial *)private_data;
+ struct tty_struct *tty = info->tty;;
+
+ if (!tty) return;
+
+ tty_hangup (tty);
+}
+
+/*
+ * -------------------------------------------------------------------
+ * startup ()
+ *
+ * various initialization tasks
+ * -------------------------------------------------------------------
+ */
+static int startup (struct dz_serial *info)
+{
+ unsigned long page, flags;
+ unsigned short tmp;
+
+ if (info->is_initialized) return 0;
+
+ save_flags (flags);
+ cli ();
+
+ if (!info->port) {
+ if (info->tty) set_bit (TTY_IO_ERROR, &info->tty->flags);
+ restore_flags (flags);
+ return -ENODEV;
+ }
+
+ if (!info->xmit_buf) {
+ page = get_free_page (GFP_KERNEL);
+ if (!page) {
+ restore_flags (flags);
+ return -ENOMEM;
+ }
+ info->xmit_buf = (unsigned char *)page;
+ }
+
+ if (info->tty) clear_bit (TTY_IO_ERROR, &info->tty->flags);
+
+ /* enable the interrupt and the scanning */
+ tmp = dz_in (info, DZ_CSR);
+ tmp |= (DZ_RIE | DZ_TIE | DZ_MSE);
+ dz_out (info, DZ_CSR, tmp);
+
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+ /* set up the speed */
+ change_speed (info);
+
+ /* clear the line transmitter buffer
+ I can't figure out why I need to do this - but
+ its necessary - in order for the console portion
+ and the interrupt portion to live happily side by side.
+ */
+
+ /* clear the line transmitter buffer
+ I can't figure out why I need to do this - but
+ its necessary - in order for the console portion
+ and the interrupt portion to live happily side by side.
+ */
+
+ info->is_initialized = 1;
+
+ restore_flags (flags);
+ return 0;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * shutdown ()
+ *
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ * -------------------------------------------------------------------
+ */
+static void shutdown (struct dz_serial *info)
+{
+ unsigned long flags;
+ unsigned short tmp;
+
+ if (!info->is_initialized) return;
+
+ save_flags (flags);
+ cli ();
+
+ dz_stop (info->tty);
+
+
+
+ info->cflags &= ~DZ_CREAD; /* turn off receive enable flag */
+ dz_out (info, DZ_LPR, info->cflags);
+
+ if (info->xmit_buf) { /* free Tx buffer */
+ free_page ((unsigned long)info->xmit_buf);
+ info->xmit_buf = 0;
+ }
+
+ if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
+ tmp = dz_in (info, DZ_TCR);
+ if (tmp & DZ_MODEM_DTR) {
+ tmp &= ~DZ_MODEM_DTR;
+ dz_out (info, DZ_TCR, tmp);
+ }
+ }
+
+ if (info->tty) set_bit (TTY_IO_ERROR, &info->tty->flags);
+
+ info->is_initialized = 0;
+ restore_flags (flags);
+}
+
+/*
+ * -------------------------------------------------------------------
+ * change_speed ()
+ *
+ * set the baud rate.
+ * -------------------------------------------------------------------
+ */
+static void change_speed (struct dz_serial *info)
+{
+ unsigned long flags;
+ unsigned cflag;
+ int baud;
+
+ if (!info->tty || !info->tty->termios) return;
+
+ save_flags (flags);
+ cli ();
+
+ info->cflags = info->line;
+
+ cflag = info->tty->termios->c_cflag;
+
+ switch (cflag & CSIZE) {
+ case CS5: info->cflags |= DZ_CS5; break;
+ case CS6: info->cflags |= DZ_CS6; break;
+ case CS7: info->cflags |= DZ_CS7; break;
+ case CS8:
+ default: info->cflags |= DZ_CS8;
+ }
+
+ if (cflag & CSTOPB) info->cflags |= DZ_CSTOPB;
+ if (cflag & PARENB) info->cflags |= DZ_PARENB;
+ if (cflag & PARODD) info->cflags |= DZ_PARODD;
+
+ baud = tty_get_baud_rate (info->tty);
+ switch (baud) {
+ case 50 : info->cflags |= DZ_B50; break;
+ case 75 : info->cflags |= DZ_B75; break;
+ case 110 : info->cflags |= DZ_B110; break;
+ case 134 : info->cflags |= DZ_B134; break;
+ case 150 : info->cflags |= DZ_B150; break;
+ case 300 : info->cflags |= DZ_B300; break;
+ case 600 : info->cflags |= DZ_B600; break;
+ case 1200: info->cflags |= DZ_B1200; break;
+ case 1800: info->cflags |= DZ_B1800; break;
+ case 2000: info->cflags |= DZ_B2000; break;
+ case 2400: info->cflags |= DZ_B2400; break;
+ case 3600: info->cflags |= DZ_B3600; break;
+ case 4800: info->cflags |= DZ_B4800; break;
+ case 7200: info->cflags |= DZ_B7200; break;
+ case 9600:
+ default : info->cflags |= DZ_B9600;
+ }
+
+ info->cflags |= DZ_RXENAB;
+ dz_out (info, DZ_LPR, info->cflags);
+
+ /* setup accept flag */
+ info->read_status_mask = DZ_OERR;
+ if (I_INPCK(info->tty))
+ info->read_status_mask |= (DZ_FERR | DZ_PERR);
+
+ /* characters to ignore */
+ info->ignore_status_mask = 0;
+ if (I_IGNPAR(info->tty))
+ info->ignore_status_mask |= (DZ_FERR | DZ_PERR);
+
+ restore_flags (flags);
+}
+
+/*
+ * -------------------------------------------------------------------
+ * dz_flush_char ()
+ *
+ * Flush the buffer.
+ * -------------------------------------------------------------------
+ */
+static void dz_flush_chars (struct tty_struct *tty)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || !info->xmit_buf)
+ return;
+
+ save_flags (flags);
+ cli ();
+
+ dz_start (info->tty);
+
+ restore_flags (flags);
+}
+
+
+/*
+ * -------------------------------------------------------------------
+ * dz_write ()
+ *
+ * main output routine.
+ * -------------------------------------------------------------------
+ */
+static int dz_write (struct tty_struct *tty, int from_user, const unsigned char *buf, int count)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+ unsigned long flags;
+ int c, ret = 0;
+
+ if (!tty ) return ret;
+ if (!info->xmit_buf) return ret;
+ if (!tmp_buf) tmp_buf = tmp_buffer;
+
+
+
+ if (from_user) {
+
+ down (&tmp_buf_sem);
+ while (1) {
+ c = MIN(count, MIN(DZ_XMIT_SIZE - info->xmit_cnt - 1, DZ_XMIT_SIZE - info->xmit_head));
+ if (c <= 0) break;
+
+ c -= copy_from_user (tmp_buf, buf, c);
+ if (!c) {
+ if (!ret) ret = -EFAULT;
+ break;
+ }
+
+ save_flags (flags);
+ cli ();
+
+ c = MIN(c, MIN(DZ_XMIT_SIZE - info->xmit_cnt - 1, DZ_XMIT_SIZE - info->xmit_head));
+ memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
+ info->xmit_head = ((info->xmit_head + c) & (DZ_XMIT_SIZE-1));
+ info->xmit_cnt += c;
+
+ restore_flags(flags);
+
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+
+ up (&tmp_buf_sem);
+ } else {
+
+
+ while (1) {
+ save_flags (flags);
+ cli ();
+
+ c = MIN(count, MIN(DZ_XMIT_SIZE - info->xmit_cnt - 1, DZ_XMIT_SIZE - info->xmit_head));
+ if (c <= 0) {
+ restore_flags (flags);
+ break;
+ }
+ memcpy (info->xmit_buf + info->xmit_head, buf, c);
+ info->xmit_head = ((info->xmit_head + c) & (DZ_XMIT_SIZE-1));
+ info->xmit_cnt += c;
+
+ restore_flags (flags);
+
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+ }
+
+
+ if (info->xmit_cnt)
+ {
+ if (!tty->stopped)
+ {
+ if (!tty->hw_stopped)
+ {
+ dz_start (info->tty);
+ }
+ }
+ }
+ return ret;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * dz_write_room ()
+ *
+ * compute the amount of space available for writing.
+ * -------------------------------------------------------------------
+ */
+static int dz_write_room (struct tty_struct *tty)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+ int ret;
+
+ ret = DZ_XMIT_SIZE - info->xmit_cnt - 1;
+ if (ret < 0) ret = 0;
+ return ret;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * dz_chars_in_buffer ()
+ *
+ * compute the amount of char left to be transmitted
+ * -------------------------------------------------------------------
+ */
+static int dz_chars_in_buffer (struct tty_struct *tty)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+
+ return info->xmit_cnt;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * dz_flush_buffer ()
+ *
+ * Empty the output buffer
+ * -------------------------------------------------------------------
+ */
+static void dz_flush_buffer (struct tty_struct *tty)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+
+ cli ();
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+ sti ();
+
+ wake_up_interruptible (&tty->write_wait);
+
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup)
+ (tty->ldisc.write_wakeup)(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * dz_throttle () and dz_unthrottle ()
+ *
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled (or not).
+ * ------------------------------------------------------------
+ */
+static void dz_throttle (struct tty_struct *tty)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+
+ if (I_IXOFF(tty))
+ info->x_char = STOP_CHAR(tty);
+}
+
+static void dz_unthrottle (struct tty_struct *tty)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+
+ if (I_IXOFF(tty)) {
+ if (info->x_char)
+ info->x_char = 0;
+ else
+ info->x_char = START_CHAR(tty);
+ }
+}
+
+static void dz_send_xchar (struct tty_struct *tty, char ch)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+
+ info->x_char = ch;
+
+ if (ch) dz_start (info->tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl () and friends
+ * ------------------------------------------------------------
+ */
+static int get_serial_info (struct dz_serial *info, struct serial_struct *retinfo)
+{
+ struct serial_struct tmp;
+
+ if (!retinfo)
+ return -EFAULT;
+
+ memset (&tmp, 0, sizeof(tmp));
+
+ tmp.type = info->type;
+ tmp.line = info->line;
+ tmp.port = info->port;
+ tmp.irq = SERIAL;
+ tmp.flags = info->flags;
+ tmp.baud_base = info->baud_base;
+ tmp.close_delay = info->close_delay;
+ tmp.closing_wait = info->closing_wait;
+
+ return copy_to_user (retinfo, &tmp, sizeof(*retinfo));
+}
+
+static int set_serial_info (struct dz_serial *info, struct serial_struct *new_info)
+{
+ struct serial_struct new_serial;
+ struct dz_serial old_info;
+ int retval = 0;
+
+ if (!new_info)
+ return -EFAULT;
+
+ copy_from_user (&new_serial, new_info, sizeof(new_serial));
+ old_info = *info;
+
+ if (!suser())
+ return -EPERM;
+
+ if (info->count > 1)
+ return -EBUSY;
+
+ /*
+ * OK, past this point, all the error checking has been done.
+ * At this point, we start making changes.....
+ */
+
+ info->baud_base = new_serial.baud_base;
+ info->type = new_serial.type;
+ info->close_delay = new_serial.close_delay;
+ info->closing_wait = new_serial.closing_wait;
+
+ retval = startup (info);
+ return retval;
+}
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ * is emptied. On bus types like RS485, the transmitter must
+ * release the bus after transmitting. This must be done when
+ * the transmit shift register is empty, not be done when the
+ * transmit holding register is empty. This functionality
+ * allows an RS485 driver to be written in user space.
+ */
+static int get_lsr_info (struct dz_serial *info, unsigned int *value)
+{
+ unsigned short status = dz_in (info, DZ_LPR);
+
+ return put_user (status, value);
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break (struct dz_serial *info, int duration)
+{
+ unsigned long flags;
+ unsigned short tmp, mask;
+
+ if (!info->port)
+ return;
+
+ mask = 1 << info->line;
+ tmp = dz_in (info, DZ_TCR);
+ tmp |= mask;
+
+ current->state = TASK_INTERRUPTIBLE;
+
+ save_flags (flags);
+ cli();
+
+ dz_out (info, DZ_TCR, tmp);
+
+ schedule_timeout(jiffies + duration);
+
+ tmp &= ~mask;
+ dz_out (info, DZ_TCR, tmp);
+
+ restore_flags (flags);
+}
+
+static int dz_ioctl (struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int error;
+ struct dz_serial * info = (struct dz_serial *)tty->driver_data;
+ int retval;
+
+ if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+ (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
+ (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ }
+
+ switch (cmd) {
+ case TCSBRK: /* SVID version: non-zero arg --> no break */
+ retval = tty_check_change (tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent (tty, 0);
+ if (!arg)
+ send_break (info, HZ/4); /* 1/4 second */
+ return 0;
+
+ case TCSBRKP: /* support for POSIX tcsendbreak() */
+ retval = tty_check_change (tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent (tty, 0);
+ send_break (info, arg ? arg*(HZ/10) : HZ/4);
+ return 0;
+
+ case TIOCGSOFTCAR:
+ error = verify_area (VERIFY_WRITE, (void *)arg, sizeof(long));
+ if (error)
+ return error;
+ put_user (C_CLOCAL(tty) ? 1 : 0, (unsigned long *)arg);
+ return 0;
+
+ case TIOCSSOFTCAR:
+ error = get_user (arg, (unsigned long *)arg);
+ if (error)
+ return error;
+ tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
+ return 0;
+
+ case TIOCGSERIAL:
+ error = verify_area (VERIFY_WRITE, (void *)arg, sizeof(struct serial_struct));
+ if (error)
+ return error;
+ return get_serial_info (info, (struct serial_struct *)arg);
+
+ case TIOCSSERIAL:
+ return set_serial_info (info, (struct serial_struct *) arg);
+
+ case TIOCSERGETLSR: /* Get line status register */
+ error = verify_area (VERIFY_WRITE, (void *)arg, sizeof(unsigned int));
+ if (error)
+ return error;
+ else
+ return get_lsr_info (info, (unsigned int *)arg);
+
+ case TIOCSERGSTRUCT:
+ error = verify_area (VERIFY_WRITE, (void *)arg, sizeof(struct dz_serial));
+ if (error)
+ return error;
+ copy_to_user((struct dz_serial *)arg, info, sizeof(struct dz_serial));
+ return 0;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return 0;
+}
+
+static void dz_set_termios (struct tty_struct *tty,
+ struct termios *old_termios)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+
+ if (tty->termios->c_cflag == old_termios->c_cflag)
+ return;
+
+ change_speed (info);
+
+ if ((old_termios->c_cflag & CRTSCTS) &&
+ !(tty->termios->c_cflag & CRTSCTS)) {
+ tty->hw_stopped = 0;
+ dz_start (tty);
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * dz_close()
+ *
+ * This routine is called when the serial port gets closed. First, we
+ * wait for the last remaining data to be sent. Then, we turn off
+ * the transmit enable and receive enable flags.
+ * ------------------------------------------------------------
+ */
+static void dz_close (struct tty_struct *tty, struct file *filp)
+{
+ struct dz_serial * info = (struct dz_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (!info) return;
+
+ save_flags (flags);
+ cli();
+
+ if (tty_hung_up_p (filp)) {
+ restore_flags (flags);
+ return;
+ }
+
+ if ((tty->count == 1) && (info->count != 1)) {
+ /*
+ * Uh, oh. tty->count is 1, which means that the tty
+ * structure will be freed. Info->count should always
+ * be one in these conditions. If it's greater than
+ * one, we've got real problems, since it means the
+ * serial port won't be shutdown.
+ */
+ printk("dz_close: bad serial port count; tty->count is 1, "
+ "info->count is %d\n", info->count);
+ info->count = 1;
+ }
+
+ if (--info->count < 0) {
+ printk("rs_close: bad serial port count for ttys%d: %d\n",
+ info->line, info->count);
+ info->count = 0;
+ }
+
+ if (info->count) {
+ restore_flags (flags);
+ return;
+ }
+ info->flags |= DZ_CLOSING;
+ /*
+ * Save the termios structure, since this port may have
+ * separate termios for callout and dialin.
+ */
+ if (info->flags & DZ_NORMAL_ACTIVE)
+ info->normal_termios = *tty->termios;
+ if (info->flags & DZ_CALLOUT_ACTIVE)
+ info->callout_termios = *tty->termios;
+ /*
+ * Now we wait for the transmit buffer to clear; and we notify
+ * the line discipline to only process XON/XOFF characters.
+ */
+ tty->closing = 1;
+
+ if (info->closing_wait != DZ_CLOSING_WAIT_NONE)
+ tty_wait_until_sent (tty, info->closing_wait);
+
+ /*
+ * At this point we stop accepting input. To do this, we
+ * disable the receive line status interrupts.
+ */
+
+ shutdown (info);
+
+ if (tty->driver.flush_buffer)
+ tty->driver.flush_buffer (tty);
+ if (tty->ldisc.flush_buffer)
+ tty->ldisc.flush_buffer (tty);
+ tty->closing = 0;
+ info->event = 0;
+ info->tty = 0;
+
+ if (tty->ldisc.num != ldiscs[N_TTY].num) {
+ if (tty->ldisc.close)
+ (tty->ldisc.close)(tty);
+ tty->ldisc = ldiscs[N_TTY];
+ tty->termios->c_line = N_TTY;
+ if (tty->ldisc.open)
+ (tty->ldisc.open)(tty);
+ }
+ if (info->blocked_open) {
+ if (info->close_delay) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(jiffies + info->close_delay);
+ }
+ wake_up_interruptible (&info->open_wait);
+ }
+
+ info->flags &= ~(DZ_NORMAL_ACTIVE | DZ_CALLOUT_ACTIVE | DZ_CLOSING);
+ wake_up_interruptible (&info->close_wait);
+
+ restore_flags (flags);
+}
+
+/*
+ * dz_hangup () --- called by tty_hangup() when a hangup is signaled.
+ */
+static void dz_hangup (struct tty_struct *tty)
+{
+ struct dz_serial *info = (struct dz_serial *)tty->driver_data;
+
+ dz_flush_buffer (tty);
+ shutdown (info);
+ info->event = 0;
+ info->count = 0;
+ info->flags &= ~(DZ_NORMAL_ACTIVE | DZ_CALLOUT_ACTIVE);
+ info->tty = 0;
+ wake_up_interruptible (&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready (struct tty_struct *tty, struct file *filp, struct dz_serial *info)
+{
+ struct wait_queue wait = { current, NULL };
+ int retval;
+ int do_clocal = 0;
+
+ /*
+ * If the device is in the middle of being closed, then block
+ * until it's done, and then try again.
+ */
+ if (info->flags & DZ_CLOSING) {
+ interruptible_sleep_on (&info->close_wait);
+ return -EAGAIN;
+ }
+
+ /*
+ * If this is a callout device, then just make sure the normal
+ * device isn't being used.
+ */
+ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
+ if (info->flags & DZ_NORMAL_ACTIVE)
+ return -EBUSY;
+
+ if ((info->flags & DZ_CALLOUT_ACTIVE) &&
+ (info->flags & DZ_SESSION_LOCKOUT) &&
+ (info->session != current->session))
+ return -EBUSY;
+
+ if ((info->flags & DZ_CALLOUT_ACTIVE) &&
+ (info->flags & DZ_PGRP_LOCKOUT) &&
+ (info->pgrp != current->pgrp))
+ return -EBUSY;
+ info->flags |= DZ_CALLOUT_ACTIVE;
+ return 0;
+ }
+
+ /*
+ * If non-blocking mode is set, or the port is not enabled,
+ * then make the check up front and then exit.
+ */
+ if ((filp->f_flags & O_NONBLOCK) ||
+ (tty->flags & (1 << TTY_IO_ERROR))) {
+ if (info->flags & DZ_CALLOUT_ACTIVE)
+ return -EBUSY;
+ info->flags |= DZ_NORMAL_ACTIVE;
+ return 0;
+ }
+
+ if (info->flags & DZ_CALLOUT_ACTIVE) {
+ if (info->normal_termios.c_cflag & CLOCAL)
+ do_clocal = 1;
+ } else {
+ if (tty->termios->c_cflag & CLOCAL)
+ do_clocal = 1;
+ }
+
+ /*
+ * Block waiting for the carrier detect and the line to become
+ * free (i.e., not in use by the callout). While we are in
+ * this loop, info->count is dropped by one, so that
+ * dz_close() knows when to free things. We restore it upon
+ * exit, either normal or abnormal.
+ */
+ retval = 0;
+ add_wait_queue (&info->open_wait, &wait);
+
+ info->count--;
+ info->blocked_open++;
+ while (1) {
+ current->state = TASK_INTERRUPTIBLE;
+ if (tty_hung_up_p (filp) || !(info->is_initialized)) {
+ retval = -EAGAIN;
+ break;
+ }
+ if (!(info->flags & DZ_CALLOUT_ACTIVE) &&
+ !(info->flags & DZ_CLOSING) && do_clocal)
+ break;
+ if (signal_pending (current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+ schedule();
+ }
+
+ current->state = TASK_RUNNING;
+ remove_wait_queue (&info->open_wait, &wait);
+ if (!tty_hung_up_p(filp))
+ info->count++;
+ info->blocked_open--;
+
+ if (retval)
+ return retval;
+ info->flags |= DZ_NORMAL_ACTIVE;
+ return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened. It
+ * enables interrupts for a serial port. It also performs the
+ * serial-specific initialization for the tty structure.
+ */
+static int dz_open (struct tty_struct *tty, struct file *filp)
+{
+ struct dz_serial *info;
+ int retval, line;
+
+ line = MINOR(tty->device) - tty->driver.minor_start;
+
+ /* The dz lines for the mouse/keyboard must be
+ * opened using their respective drivers.
+ */
+ if ((line < 0) || (line >= DZ_NB_PORT))
+ return -ENODEV;
+
+ if ((line == DZ_KEYBOARD) || (line == DZ_MOUSE))
+ return -ENODEV;
+
+ info = lines[line];
+ info->count++;
+
+ tty->driver_data = info;
+ info->tty = tty;
+
+ /*
+ * Start up serial port
+ */
+ retval = startup (info);
+ if (retval)
+ return retval;
+
+
+
+ retval = block_til_ready (tty, filp, info);
+ if (retval)
+ return retval;
+
+ if ((info->count == 1) && (info->flags & DZ_SPLIT_TERMIOS)) {
+ if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
+ *tty->termios = info->normal_termios;
+ else
+ *tty->termios = info->callout_termios;
+ change_speed (info);
+
+ }
+
+ info->session = current->session;
+ info->pgrp = current->pgrp;
+ return 0;
+}
+
+static void show_serial_version (void)
+{
+ printk("%s%s\n", dz_name, dz_version);
+}
+
+
+__initfunc(int dz_init(void))
+{
+ int i, flags;
+ struct dz_serial *info;
+
+ /* Setup base handler, and timer table. */
+ init_bh (SERIAL_BH, do_serial_bh);
+
+ show_serial_version ();
+
+ memset(&serial_driver, 0, sizeof(struct tty_driver));
+ serial_driver.magic = TTY_DRIVER_MAGIC;
+ serial_driver.name = "ttyS";
+ serial_driver.major = TTY_MAJOR;
+ serial_driver.minor_start = 64;
+ serial_driver.num = DZ_NB_PORT;
+ serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
+ serial_driver.subtype = SERIAL_TYPE_NORMAL;
+ serial_driver.init_termios = tty_std_termios;
+
+ serial_driver.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ serial_driver.flags = TTY_DRIVER_REAL_RAW;
+ serial_driver.refcount = &serial_refcount;
+ serial_driver.table = serial_table;
+ serial_driver.termios = serial_termios;
+ serial_driver.termios_locked = serial_termios_locked;
+
+ serial_driver.open = dz_open;
+ serial_driver.close = dz_close;
+ serial_driver.write = dz_write;
+ serial_driver.flush_chars = dz_flush_chars;
+ serial_driver.write_room = dz_write_room;
+ serial_driver.chars_in_buffer = dz_chars_in_buffer;
+ serial_driver.flush_buffer = dz_flush_buffer;
+ serial_driver.ioctl = dz_ioctl;
+ serial_driver.throttle = dz_throttle;
+ serial_driver.unthrottle = dz_unthrottle;
+ serial_driver.send_xchar = dz_send_xchar;
+ serial_driver.set_termios = dz_set_termios;
+ serial_driver.stop = dz_stop;
+ serial_driver.start = dz_start;
+ serial_driver.hangup = dz_hangup;
+
+ /*
+ * The callout device is just like normal device except for
+ * major number and the subtype code.
+ */
+ callout_driver = serial_driver;
+ callout_driver.name = "cua";
+ callout_driver.major = TTYAUX_MAJOR;
+ callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+
+ if (tty_register_driver (&serial_driver))
+ panic("Couldn't register serial driver\n");
+ if (tty_register_driver (&callout_driver))
+ panic("Couldn't register callout driver\n");
+ save_flags(flags); cli();
+
+ i = 0;
+ for (info = &multi[i]; i < DZ_NB_PORT; i++)
+ {
+ lines[i] = info;
+ info->magic = SERIAL_MAGIC;
+
+ if ((mips_machtype == MACH_DS23100) || (mips_machtype == MACH_DS5100))
+ info->port = (unsigned long) KN01_DZ11_BASE;
+ else
+ info->port = (unsigned long) KN02_DZ11_BASE;
+
+ info->line = i;
+ info->tty = 0;
+ info->close_delay = 50;
+ info->closing_wait = 3000;
+ info->x_char = 0;
+ info->event = 0;
+ info->count = 0;
+ info->blocked_open = 0;
+ info->tqueue.routine = do_softint;
+ info->tqueue.data = info;
+ info->tqueue_hangup.routine = do_serial_hangup;
+ info->tqueue_hangup.data = info;
+ info->callout_termios = callout_driver.init_termios;
+ info->normal_termios = serial_driver.init_termios;
+ info->open_wait = 0;
+ info->close_wait = 0;
+
+ /* If we are pointing to address zero then punt - not correctly
+ set up in setup.c to handle this. */
+ if (! info->port)
+ return 0;
+
+ printk("ttyS%02d at 0x%04x (irq = %d)\n", info->line, info->port, SERIAL);
+ }
+
+ /* reset the chip */
+#ifndef CONFIG_SERIAL_CONSOLE
+ dz_out(info, DZ_CSR, DZ_CLR);
+ while ((tmp = dz_in(info,DZ_CSR)) & DZ_CLR) ;
+ wbflush();
+
+ /* enable scanning */
+ dz_out(info, DZ_CSR, DZ_MSE);
+#endif
+
+ /* order matters here... the trick is that flags
+ is updated... in request_irq - to immediatedly obliterate
+ it is unwise. */
+ restore_flags(flags);
+
+
+ if (request_irq (SERIAL, dz_interrupt, SA_INTERRUPT, "DZ", lines[0]))
+ panic ("Unable to register DZ interrupt\n");
+
+ return 0;
+}
+
+#ifdef CONFIG_SERIAL_CONSOLE
+static void dz_console_put_char (unsigned char ch)
+{
+ long flags;
+ int loops = 2500;
+ unsigned short tmp = ch;
+ /* this code sends stuff out to serial device - spinning its
+ wheels and waiting. */
+
+ /* force the issue - point it at lines[3]*/
+ dz_console=&multi[CONSOLE_LINE];
+
+ save_flags(flags);
+ cli();
+
+
+ /* spin our wheels */
+ while (((dz_in(dz_console,DZ_TCR) & DZ_TRDY) != DZ_TRDY) && loops--)
+ ;
+
+ /* Actually transmit the character. */
+ dz_out (dz_console, DZ_TDR, tmp);
+
+ restore_flags(flags);
+}
+/*
+ * -------------------------------------------------------------------
+ * dz_console_print ()
+ *
+ * dz_console_print is registered for printk.
+ * -------------------------------------------------------------------
+ */
+static void dz_console_print (struct console *cons,
+ const char *str,
+ unsigned int count)
+{
+#ifdef DEBUG_DZ
+ prom_printf((char *)str);
+#endif
+ while (count--)
+ {
+ if (*str == '\n')
+ dz_console_put_char ('\r');
+ dz_console_put_char (*str++);
+ }
+}
+
+static int dz_console_wait_key(struct console *co)
+{
+ return 0;
+}
+
+static kdev_t dz_console_device(struct console *c)
+{
+ return MKDEV(TTY_MAJOR, 64 + c->index);
+}
+
+__initfunc(static int dz_console_setup(struct console *co, char *options))
+{
+ int baud = 9600;
+ int bits = 8;
+ int parity = 'n';
+ int cflag = CREAD | HUPCL | CLOCAL;
+ char *s;
+ unsigned short mask,tmp;
+
+ if (options) {
+ baud = simple_strtoul(options, NULL, 10);
+ s = options;
+ while(*s >= '0' && *s <= '9')
+ s++;
+ if (*s)
+ parity = *s++;
+ if (*s)
+ bits = *s - '0';
+ }
+
+ /*
+ * Now construct a cflag setting.
+ */
+ switch(baud) {
+ case 1200:
+ cflag |= DZ_B1200;
+ break;
+ case 2400:
+ cflag |= DZ_B2400;
+ break;
+ case 4800:
+ cflag |= DZ_B4800;
+ break;
+ case 9600:
+ default:
+ cflag |= DZ_B9600;
+ break;
+ }
+ switch(bits) {
+ case 7:
+ cflag |= DZ_CS7;
+ break;
+ default:
+ case 8:
+ cflag |= DZ_CS8;
+ break;
+ }
+ switch(parity) {
+ case 'o': case 'O':
+ cflag |= DZ_PARODD;
+ break;
+ case 'e': case 'E':
+ cflag |= DZ_PARENB;
+ break;
+ }
+ co->cflag = cflag;
+
+ /* TOFIX: force to console line */
+ dz_console = &multi[CONSOLE_LINE];
+ if ((mips_machtype == MACH_DS23100) || (mips_machtype == MACH_DS5100))
+ dz_console->port = KN01_DZ11_BASE;
+ else
+ dz_console->port = KN02_DZ11_BASE;
+ dz_console->line = CONSOLE_LINE;
+
+ dz_out(dz_console, DZ_CSR, DZ_CLR);
+ while ((tmp = dz_in(dz_console,DZ_CSR)) & DZ_CLR)
+ ;
+
+ /* enable scanning */
+ dz_out(dz_console, DZ_CSR, DZ_MSE);
+
+ /* Set up flags... */
+ dz_console->cflags = 0;
+ dz_console->cflags |= DZ_B9600;
+ dz_console->cflags |= DZ_CS8;
+ dz_console->cflags |= DZ_PARENB;
+ dz_out (dz_console, DZ_LPR, dz_console->cflags);
+
+
+ mask = 1 << dz_console->line;
+ tmp = dz_in (dz_console, DZ_TCR); /* read the TX flag */
+ if (!(tmp & mask)) {
+ tmp |= mask; /* set the TX flag */
+ dz_out (dz_console, DZ_TCR, tmp);
+ }
+
+
+ /* TOFIX: force to console line */
+ dz_console = &multi[CONSOLE_LINE];
+ if ((mips_machtype == MACH_DS23100) || (mips_machtype == MACH_DS5100))
+ dz_console->port = KN01_DZ11_BASE;
+ else
+ dz_console->port = KN02_DZ11_BASE;
+ dz_console->line = CONSOLE_LINE;
+
+ dz_out(dz_console, DZ_CSR, DZ_CLR);
+ while ((tmp = dz_in(dz_console,DZ_CSR)) & DZ_CLR)
+ ;
+
+ /* enable scanning */
+ dz_out(dz_console, DZ_CSR, DZ_MSE);
+
+ /* Set up flags... */
+ dz_console->cflags = 0;
+ dz_console->cflags |= DZ_B9600;
+ dz_console->cflags |= DZ_CS8;
+ dz_console->cflags |= DZ_PARENB;
+ dz_out (dz_console, DZ_LPR, dz_console->cflags);
+
+
+ mask = 1 << dz_console->line;
+ tmp = dz_in (dz_console, DZ_TCR); /* read the TX flag */
+ if (!(tmp & mask)) {
+ tmp |= mask; /* set the TX flag */
+ dz_out (dz_console, DZ_TCR, tmp);
+ }
+
+
+ return 0;
+}
+
+static struct console dz_sercons = {
+ "ttyS",
+ dz_console_print,
+ NULL,
+ dz_console_device,
+ dz_console_wait_key,
+ NULL,
+ dz_console_setup,
+ CON_CONSDEV | CON_PRINTBUFFER,
+ CONSOLE_LINE,
+ 0,
+ NULL
+};
+
+__initfunc (long dz_serial_console_init(long kmem_start, long kmem_end))
+{
+ register_console(&dz_sercons);
+
+ return kmem_start;
+}
+
+#endif /* ifdef CONFIG_SERIAL_CONSOLE */
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)