| /* |
| * 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 |
| Qua Jun 27 15:02:26 BRT 2001 |
| * [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups |
| * |
| * Parts (C) 1999 David Airlie, airlied@linux.ie |
| * [07-SEP-99] Bugfixes |
| */ |
| |
| #define DEBUG_DZ 1 |
| |
| #include <linux/config.h> |
| #include <linux/version.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/mm.h> |
| #include <linux/major.h> |
| #include <linux/module.h> |
| #include <linux/param.h> |
| #include <linux/interrupt.h> |
| |
| #include <linux/console.h> |
| #include <linux/tty.h> |
| #include <linux/tty_flip.h> |
| |
| #include <linux/ptrace.h> |
| #include <linux/fs.h> |
| |
| #include <asm/bootinfo.h> |
| #include <asm/dec/interrupts.h> |
| #include <asm/dec/kn01.h> |
| #include <asm/dec/kn02.h> |
| #include <asm/dec/machtype.h> |
| #include <asm/dec/prom.h> |
| #include <asm/irq.h> |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| |
| #define CONSOLE_LINE (3) /* for definition of struct console */ |
| |
| #include "dz.h" |
| |
| #define DZ_INTR_DEBUG 1 |
| |
| DECLARE_TASK_QUEUE(tq_serial); |
| |
| 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; |
| unsigned short mask, tmp; |
| |
| if (tty == 0) |
| return; |
| |
| info = (struct dz_serial *) tty->driver_data; |
| |
| 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 */ |
| |
| #if 0 |
| if (info->is_console) { |
| if (ch == 0) |
| return; /* it's a break ... */ |
| } |
| #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; |
| |
| /* get the reason why we just got an irq */ |
| status = dz_in((struct dz_serial *) dev, DZ_CSR); |
| 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_zeroed_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 = dec_interrupt[DEC_IRQ_DZ11]; |
| 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)) ? -EFAULT : 0; |
| } |
| |
| 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; |
| |
| if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) |
| return -EFAULT; |
| |
| old_info = *info; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| 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(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) |
| { |
| 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: |
| return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long *) arg); |
| |
| case TIOCSSOFTCAR: |
| if (get_user(arg, (unsigned long *) arg)) |
| return -EFAULT; |
| tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | |
| (arg ? CLOCAL : 0)); |
| return 0; |
| |
| case TIOCGSERIAL: |
| 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 */ |
| return get_lsr_info(info, (unsigned int *) arg); |
| |
| case TIOCSERGSTRUCT: |
| return copy_to_user((struct dz_serial *) arg, info, |
| sizeof(struct dz_serial)) ? -EFAULT : 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("ds_close: bad serial port count for ttyS%02d: %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(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) |
| { |
| DECLARE_WAITQUEUE(wait, current); |
| 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) { |
| set_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); |
| } |
| |
| int __init dz_init(void) |
| { |
| int i, tmp; |
| long 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.owner = THIS_MODULE; |
| #if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS)) |
| serial_driver.name = "ttyS"; |
| #else |
| serial_driver.name = "tts/%d"; |
| #endif |
| 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 | TTY_DRIVER_NO_DEVFS; |
| 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; |
| #if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS)) |
| callout_driver.name = "cua"; |
| #else |
| callout_driver.name = "cua/%d"; |
| #endif |
| callout_driver.major = TTYAUX_MAJOR; |
| callout_driver.subtype = SERIAL_TYPE_CALLOUT; |
| |
| if (tty_register_driver(&serial_driver)) |
| panic("Couldn't register serial driver"); |
| if (tty_register_driver(&callout_driver)) |
| panic("Couldn't register callout driver"); |
| save_flags(flags); |
| cli(); |
| |
| for (i = 0; i < DZ_NB_PORT; i++) { |
| info = &multi[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; |
| init_waitqueue_head(&info->open_wait); |
| init_waitqueue_head(&info->close_wait); |
| |
| /* |
| * 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%08x (irq = %d)\n", info->line, |
| info->port, dec_interrupt[DEC_IRQ_DZ11]); |
| |
| tty_register_devfs(&serial_driver, |
| serial_driver.minor_start + info->line); |
| tty_register_devfs(&callout_driver, |
| callout_driver.minor_start + info->line); |
| } |
| |
| /* reset the chip */ |
| #ifndef CONFIG_SERIAL_DEC_CONSOLE |
| dz_out(info, DZ_CSR, DZ_CLR); |
| while ((tmp = dz_in(info, DZ_CSR)) & DZ_CLR); |
| iob(); |
| |
| /* 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(dec_interrupt[DEC_IRQ_DZ11], dz_interrupt, |
| SA_INTERRUPT, "DZ", lines[0])) |
| panic("Unable to register DZ interrupt"); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_SERIAL_DEC_CONSOLE |
| static void dz_console_put_char(unsigned char ch) |
| { |
| unsigned 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_CSR) & 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. |
| * The console must be locked when we get here. |
| * ------------------------------------------------------------------- |
| */ |
| 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 kdev_t dz_console_device(struct console *c) |
| { |
| return mk_kdev(TTY_MAJOR, 64 + c->index); |
| } |
| |
| static int __init 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); |
| } |
| return 0; |
| } |
| |
| static struct console dz_sercons = |
| { |
| .name = "ttyS", |
| .write = dz_console_print, |
| .device = dz_console_device, |
| .setup = dz_console_setup, |
| .flags = CON_CONSDEV | CON_PRINTBUFFER, |
| .index = CONSOLE_LINE, |
| }; |
| |
| void __init dz_serial_console_init(void) |
| { |
| register_console(&dz_sercons); |
| } |
| |
| #endif /* CONFIG_SERIAL_DEC_CONSOLE */ |
| |
| MODULE_LICENSE("GPL"); |