diff options
Diffstat (limited to 'sys/dev/sio/sio.c')
| -rw-r--r-- | sys/dev/sio/sio.c | 40 |
1 files changed, 23 insertions, 17 deletions
diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c index 2a73b2f..697deb8 100644 --- a/sys/dev/sio/sio.c +++ b/sys/dev/sio/sio.c @@ -31,7 +31,7 @@ * SUCH DAMAGE. * * from: @(#)com.c 7.5 (Berkeley) 5/16/91 - * $Id: sio.c,v 1.147 1996/09/30 12:22:27 bde Exp $ + * $Id: sio.c,v 1.148 1996/11/02 02:26:01 pst Exp $ */ #include "opt_comconsole.h" @@ -1619,6 +1619,10 @@ sioioctl(dev, cmd, data, flag, p) case TIOCCDTR: (void)commctl(com, TIOCM_DTR, DMBIC); break; + /* + * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set. The + * changes get undone on the next call to comparam(). + */ case TIOCMSET: (void)commctl(com, *(int *)data, DMSET); break; @@ -1724,13 +1728,6 @@ repeat: * of input, so enable RTS if it is now disabled and * there is room in the high-level buffer. */ - /* - * XXX this used not to look at CS_RTS_IFLOW. The - * change is to allow full control of MCR_RTS via - * ioctls after turning CS_RTS_IFLOW off. Check - * for races. We shouldn't allow the ioctls while - * CS_RTS_IFLOW is on. - */ if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) && !(tp->t_state & TS_TBLOCK)) @@ -1957,10 +1954,22 @@ retry: outb(iobase + com_cfcr, com->cfcr_image = cfcr); if (!(tp->t_state & TS_TTSTOP)) com->state |= CS_TTGO; - if (cflag & CRTS_IFLOW) - com->state |= CS_RTS_IFLOW; /* XXX - secondary changes? */ - else + if (cflag & CRTS_IFLOW) { + com->state |= CS_RTS_IFLOW; + /* + * If CS_RTS_IFLOW just changed from off to on, the change + * needs to be propagated to MCR_RTS. This isn't urgent, + * so do it later by calling comstart() instead of repeating + * a lot of code from comstart() here. + */ + } else if (com->state & CS_RTS_IFLOW) { com->state &= ~CS_RTS_IFLOW; + /* + * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS + * on here, since comstart() won't do it later. + */ + outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); + } /* * Set up state to handle output flow control. @@ -1986,6 +1995,7 @@ retry: enable_intr(); splx(s); + comstart(tp); return (0); } @@ -2009,12 +2019,8 @@ comstart(tp) if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW) outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); } else { - /* - * XXX don't raise MCR_RTS if CTS_RTS_IFLOW is off. Set it - * appropriately in comparam() if RTS-flow is being changed. - * Check for races. - */ - if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater) + if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater + && com->state & CS_RTS_IFLOW) outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); } enable_intr(); |
