/* * 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 * * Parts (C) 1999 David Airlie, airlied@linux.ie * [07-SEP-99] Bugfixes */ #define DEBUG_DZ 1 #include #ifdef MODULE #include #else #define MOD_INC_USE_COUNT #define MOD_DEC_USE_COUNT #endif #include #include #include #include #include #include #include #include #include #include #include /* for definition of SERIAL */ #include /* for definition of struct console */ #ifdef CONFIG_SERIAL_CONSOLE #define CONSOLE_LINE (3) #endif /* ifdef CONFIG_SERIAL_CONSOLE */ #if defined(CONFIG_SERIAL_CONSOLE) || defined(DEBUG_DZ) #include #endif /* if defined(CONFIG_SERIAL_CONSOLE) || defined(DEBUG_DZ) */ #include #include #include #include #include #include #include #include #ifdef DEBUG_DZ #include #include #include extern int (*prom_printf) (char *,...); #endif #include "dz.h" #define DZ_INTR_DEBUG 1 DECLARE_TASK_QUEUE(tq_serial); extern wait_queue_head_t 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; 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 ... */ 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; 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) { 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("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, flags, tmp; 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; #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\n"); if (tty_register_driver (&callout_driver)) panic("Couldn't register callout driver\n"); 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, SERIAL); tty_register_devfs(&serial_driver, 0, serial_driver.minor_start + info->line); tty_register_devfs(&callout_driver, 0, callout_driver.minor_start + info->line); } /* 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) { 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_lock must be held 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 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); } 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, wait_key: dz_console_wait_key, setup: dz_console_setup, flags: CON_CONSDEV | CON_PRINTBUFFER, index: CONSOLE_LINE, }; void __init dz_serial_console_init(void) { register_console(&dz_sercons); } #endif /* ifdef CONFIG_SERIAL_CONSOLE */