diff options
author | peter <peter@FreeBSD.org> | 1999-04-17 01:02:27 +0000 |
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committer | peter <peter@FreeBSD.org> | 1999-04-17 01:02:27 +0000 |
commit | 3f4f549a18682f2412d2082b5e560ff3cf439999 (patch) | |
tree | 064fa4681e352d9a25732fbbc3048db3484fa860 /sys/isa/sio.c | |
parent | 267905b9c3e21e04722b794e9b1bb32ef34a22d1 (diff) | |
download | FreeBSD-src-3f4f549a18682f2412d2082b5e560ff3cf439999.zip FreeBSD-src-3f4f549a18682f2412d2082b5e560ff3cf439999.tar.gz |
Merge up to rev 1.234 (nice revision number!) of i386/isa/sio.c.
Diffstat (limited to 'sys/isa/sio.c')
-rw-r--r-- | sys/isa/sio.c | 321 |
1 files changed, 206 insertions, 115 deletions
diff --git a/sys/isa/sio.c b/sys/isa/sio.c index 5a86143..7599812 100644 --- a/sys/isa/sio.c +++ b/sys/isa/sio.c @@ -30,7 +30,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: sio.c,v 1.222 1999/04/16 21:22:34 peter Exp $ + * $Id: sio.c,v 1.223 1999/04/17 00:37:01 peter Exp $ * from: @(#)com.c 7.5 (Berkeley) 5/16/91 * from: i386/isa sio.c,v 1.215 */ @@ -73,6 +73,7 @@ #ifdef DEVFS #include <sys/devfsext.h> #endif +#include <sys/timepps.h> #include <isa/isareg.h> #include <isa/isavar.h> @@ -128,7 +129,6 @@ #define NSIOTOT (NSIO + EXTRA_SIO) #define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */ -#define RS_IBUFSIZE 256 #define CALLOUT_MASK 0x80 #define CONTROL_MASK 0x60 @@ -162,18 +162,6 @@ #define com_scr 7 /* scratch register for 16450-16550 (R/W) */ /* - * Input buffer watermarks. - * The external device is asked to stop sending when the buffer exactly reaches - * high water, or when the high level requests it. - * The high level is notified immediately (rather than at a later clock tick) - * when this watermark is reached. - * The buffer size is chosen so the watermark should almost never be reached. - * The low watermark is invisibly 0 since the buffer is always emptied all at - * once. - */ -#define RS_IHIGHWATER (3 * RS_IBUFSIZE / 4) - -/* * com state bits. * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher * than the other bits so that they can be tested as a group without masking @@ -262,8 +250,11 @@ struct com_s { u_char hotchar; /* ldisc-specific char to be handled ASAP */ u_char *ibuf; /* start of input buffer */ u_char *ibufend; /* end of input buffer */ + u_char *ibufold; /* old input buffer, to be freed */ u_char *ihighwater; /* threshold in input buffer */ u_char *iptr; /* next free spot in input buffer */ + int ibufsize; /* size of ibuf (not include error bytes) */ + int ierroff; /* offset of error bytes in ibuf */ struct lbq obufq; /* head of queue of output buffers */ struct lbq obufs[2]; /* output buffers */ @@ -293,6 +284,7 @@ struct com_s { bool_t do_dcd_timestamp; struct timeval timestamp; struct timeval dcd_timestamp; + struct pps_state pps; u_long bytes_in; /* statistics */ u_long bytes_out; @@ -300,14 +292,6 @@ struct com_s { u_long error_counts[CE_NTYPES]; /* - * Ping-pong input buffers. The extra factor of 2 in the sizes is - * to allow for an error byte for each input byte. - */ -#define CE_INPUT_OFFSET RS_IBUFSIZE - u_char ibuf1[2 * RS_IBUFSIZE]; - u_char ibuf2[2 * RS_IBUFSIZE]; - - /* * Data area for output buffers. Someday we should build the output * buffer queue without copying data. */ @@ -332,6 +316,7 @@ static int sioattach __P((device_t dev)); static timeout_t siobusycheck; static timeout_t siodtrwakeup; static void comhardclose __P((struct com_s *com)); +static void sioinput __P((struct com_s *com)); static void siointr1 __P((struct com_s *com)); static void siointr __P((void *arg)); static int commctl __P((struct com_s *com, int bits, int how)); @@ -339,6 +324,7 @@ static int comparam __P((struct tty *tp, struct termios *t)); static swihand_t siopoll; static int sioprobe __P((device_t dev)); static void siosettimeout __P((void)); +static int siosetwater __P((struct com_s *com, speed_t speed)); static void comstart __P((struct tty *tp)); static timeout_t comwakeup; static void disc_optim __P((struct tty *tp, struct termios *t, @@ -565,8 +551,9 @@ siounload(struct pccard_devinfo *devi) ttwwakeup(com->tp); } else { com_addr(com->unit) = NULL; - bzero(com, sizeof *com); - free(com,M_TTYS); + if (com->ibuf != NULL) + free(com->ibuf, M_DEVBUF); + free(com, M_DEVBUF); printf("sio%d: unload,gone\n", devi->isahd.id_unit); } } @@ -947,9 +934,6 @@ sioattach(dev) com->loses_outints = COM_LOSESOUTINTS(flags) != 0; com->no_irq = isa_get_irq(dev) < 0; com->tx_fifo_size = 1; - com->iptr = com->ibuf = com->ibuf1; - com->ibufend = com->ibuf1 + RS_IBUFSIZE; - com->ihighwater = com->ibuf1 + RS_IHIGHWATER; com->obufs[0].l_head = com->obuf1; com->obufs[1].l_head = com->obuf2; @@ -983,6 +967,12 @@ sioattach(dev) com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate; } else com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED; + if (siosetwater(com, com->it_in.c_ispeed) != 0) { + enable_intr(); + free(com, M_DEVBUF); + return (0); + } + enable_intr(); termioschars(&com->it_in); com->it_out = com->it_in; @@ -1127,6 +1117,8 @@ determined_type: ; UID_UUCP, GID_DIALER, 0660, "cuala%r", unit); #endif com->flags = isa_get_flags(dev); /* Heritate id_flags for later */ + com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; + pps_init(&com->pps); res = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, 0ul, ~0ul, 1, RF_SHAREABLE | RF_ACTIVE); @@ -1219,9 +1211,6 @@ open_top: tp->t_dev = dev; tp->t_termios = mynor & CALLOUT_MASK ? com->it_out : com->it_in; - tp->t_ififosize = 2 * RS_IBUFSIZE; - tp->t_ispeedwat = (speed_t)-1; - tp->t_ospeedwat = (speed_t)-1; (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET); com->poll = com->no_irq; com->poll_output = com->loses_outints; @@ -1353,8 +1342,10 @@ sioclose(dev, flag, mode, p) if (com->gone) { printf("sio%d: gone\n", com->unit); s = spltty(); + if (com->ibuf != NULL) + free(com->ibuf, M_DEVBUF); bzero(tp,sizeof *tp); - bzero(com,sizeof *com); + free(com, M_DEVBUF); splx(s); } return (0); @@ -1376,6 +1367,7 @@ comhardclose(com) com->poll_output = FALSE; com->do_timestamp = FALSE; com->do_dcd_timestamp = FALSE; + com->pps.ppsparam.mode = 0; outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); { outb(iobase + com_ier, 0); @@ -1503,6 +1495,88 @@ siodtrwakeup(chan) wakeup(&com->dtr_wait); } +static void +sioinput(com) + struct com_s *com; +{ + u_char *buf; + int incc; + u_char line_status; + int recv_data; + struct tty *tp; + + buf = com->ibuf; + tp = com->tp; + if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) { + com_events -= (com->iptr - com->ibuf); + com->iptr = com->ibuf; + return; + } + if (tp->t_state & TS_CAN_BYPASS_L_RINT) { + /* + * Avoid the grotesquely inefficient lineswitch routine + * (ttyinput) in "raw" mode. It usually takes about 450 + * instructions (that's without canonical processing or echo!). + * slinput is reasonably fast (usually 40 instructions plus + * call overhead). + */ + do { + enable_intr(); + incc = com->iptr - buf; + if (tp->t_rawq.c_cc + incc > tp->t_ihiwat + && (com->state & CS_RTS_IFLOW + || tp->t_iflag & IXOFF) + && !(tp->t_state & TS_TBLOCK)) + ttyblock(tp); + com->delta_error_counts[CE_TTY_BUF_OVERFLOW] + += b_to_q((char *)buf, incc, &tp->t_rawq); + buf += incc; + tk_nin += incc; + tk_rawcc += incc; + tp->t_rawcc += incc; + ttwakeup(tp); + if (tp->t_state & TS_TTSTOP + && (tp->t_iflag & IXANY + || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) { + tp->t_state &= ~TS_TTSTOP; + tp->t_lflag &= ~FLUSHO; + comstart(tp); + } + disable_intr(); + } while (buf < com->iptr); + } else { + do { + enable_intr(); + line_status = buf[com->ierroff]; + recv_data = *buf++; + if (line_status + & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) { + if (line_status & LSR_BI) + recv_data |= TTY_BI; + if (line_status & LSR_FE) + recv_data |= TTY_FE; + if (line_status & LSR_OE) + recv_data |= TTY_OE; + if (line_status & LSR_PE) + recv_data |= TTY_PE; + } + (*linesw[tp->t_line].l_rint)(recv_data, tp); + disable_intr(); + } while (buf < com->iptr); + } + com_events -= (com->iptr - com->ibuf); + com->iptr = com->ibuf; + + /* + * There is now room for another low-level buffer full of input, + * so enable RTS if it is now disabled and there is room in the + * high-level buffer. + */ + if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) && + !(tp->t_state & TS_TBLOCK)) + outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); +} + void siointr(arg) void *arg; @@ -1554,11 +1628,23 @@ siointr1(com) u_char recv_data; u_char int_ctl; u_char int_ctl_new; + struct timecounter *tc; + u_int count; int_ctl = inb(com->intr_ctl_port); int_ctl_new = int_ctl; while (!com->gone) { + if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) { + modem_status = inb(com->modem_status_port); + if ((modem_status ^ com->last_modem_status) & MSR_DCD) { + tc = timecounter; + count = tc->tc_get_timecount(tc); + pps_event(&com->pps, tc, count, + (modem_status & MSR_DCD) ? + PPS_CAPTURECLEAR : PPS_CAPTUREASSERT); + } + } line_status = inb(com->line_status_port); /* input event? (check first to help avoid overruns) */ @@ -1617,7 +1703,7 @@ if (com->iptr - com->ibuf == 8) setsofttty(); #endif ioptr[0] = recv_data; - ioptr[CE_INPUT_OFFSET] = line_status; + ioptr[com->ierroff] = line_status; com->iptr = ++ioptr; if (ioptr == com->ihighwater && com->state & CS_RTS_IFLOW) @@ -1872,7 +1958,10 @@ sioioctl(dev, cmd, data, flag, p) break; default: splx(s); - return (ENOTTY); + error = pps_ioctl(cmd, data, &com->pps); + if (error == ENODEV) + error = ENOTTY; + return (error); } splx(s); return (0); @@ -1887,9 +1976,7 @@ siopoll() return; repeat: for (unit = 0; unit < NSIOTOT; ++unit) { - u_char *buf; struct com_s *com; - u_char *ibuf; int incc; struct tty *tp; @@ -1913,38 +2000,11 @@ repeat: enable_intr(); continue; } - - /* switch the role of the low-level input buffers */ - if (com->iptr == (ibuf = com->ibuf)) { - buf = NULL; /* not used, but compiler can't tell */ - incc = 0; - } else { - buf = ibuf; + if (com->iptr != com->ibuf) { disable_intr(); - incc = com->iptr - buf; - com_events -= incc; - if (ibuf == com->ibuf1) - ibuf = com->ibuf2; - else - ibuf = com->ibuf1; - com->ibufend = ibuf + RS_IBUFSIZE; - com->ihighwater = ibuf + RS_IHIGHWATER; - com->iptr = ibuf; - - /* - * There is now room for another low-level buffer full - * of input, so enable RTS if it is now disabled and - * there is room in the high-level buffer. - */ - if ((com->state & CS_RTS_IFLOW) - && !(com->mcr_image & MCR_RTS) - && !(tp->t_state & TS_TBLOCK)) - outb(com->modem_ctl_port, - com->mcr_image |= MCR_RTS); + sioinput(com); enable_intr(); - com->ibuf = ibuf; } - if (com->state & CS_CHECKMSR) { u_char delta_modem_status; @@ -1971,56 +2031,6 @@ repeat: } (*linesw[tp->t_line].l_start)(tp); } - if (incc <= 0 || !(tp->t_state & TS_ISOPEN) || - !(tp->t_cflag & CREAD)) - continue; - /* - * Avoid the grotesquely inefficient lineswitch routine - * (ttyinput) in "raw" mode. It usually takes about 450 - * instructions (that's without canonical processing or echo!). - * slinput is reasonably fast (usually 40 instructions plus - * call overhead). - */ - if (tp->t_state & TS_CAN_BYPASS_L_RINT) { - if (tp->t_rawq.c_cc + incc > tp->t_ihiwat - && (com->state & CS_RTS_IFLOW - || tp->t_iflag & IXOFF) - && !(tp->t_state & TS_TBLOCK)) - ttyblock(tp); - tk_nin += incc; - tk_rawcc += incc; - tp->t_rawcc += incc; - com->delta_error_counts[CE_TTY_BUF_OVERFLOW] - += b_to_q((char *)buf, incc, &tp->t_rawq); - ttwakeup(tp); - if (tp->t_state & TS_TTSTOP - && (tp->t_iflag & IXANY - || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) { - tp->t_state &= ~TS_TTSTOP; - tp->t_lflag &= ~FLUSHO; - comstart(tp); - } - } else { - do { - u_char line_status; - int recv_data; - - line_status = (u_char) buf[CE_INPUT_OFFSET]; - recv_data = (u_char) *buf++; - if (line_status - & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) { - if (line_status & LSR_BI) - recv_data |= TTY_BI; - if (line_status & LSR_FE) - recv_data |= TTY_FE; - if (line_status & LSR_OE) - recv_data |= TTY_OE; - if (line_status & LSR_PE) - recv_data |= TTY_PE; - } - (*linesw[tp->t_line].l_rint)(recv_data, tp); - } while (--incc > 0); - } if (com_events == 0) break; } @@ -2107,7 +2117,12 @@ comparam(tp, t) outb(iobase + com_fifo, com->fifo_image); } - disable_intr(); /* very important while com_data is hidden */ + /* + * This returns with interrupts disabled so that we can complete + * the speed change atomically. Keeping interrupts disabled is + * especially important while com_data is hidden. + */ + (void) siosetwater(com, t->c_ispeed); if (divisor != 0) { outb(iobase + com_cfcr, cfcr | CFCR_DLAB); @@ -2196,6 +2211,80 @@ comparam(tp, t) enable_intr(); splx(s); comstart(tp); + if (com->ibufold != NULL) { + free(com->ibufold, M_DEVBUF); + com->ibufold = NULL; + } + return (0); +} + +static int +siosetwater(com, speed) + struct com_s *com; + speed_t speed; +{ + int cp4ticks; + u_char *ibuf; + int ibufsize; + struct tty *tp; + + /* + * Make the buffer size large enough to handle a softtty interrupt + * latency of about 2 ticks without loss of throughput or data + * (about 3 ticks if input flow control is not used or not honoured, + * but a bit less for CS5-CS7 modes). + */ + cp4ticks = speed / 10 / hz * 4; + for (ibufsize = 128; ibufsize < cp4ticks;) + ibufsize <<= 1; + if (ibufsize == com->ibufsize) { + disable_intr(); + return (0); + } + + /* + * Allocate input buffer. The extra factor of 2 in the size is + * to allow for an error byte for each input byte. + */ + ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT); + if (ibuf == NULL) { + disable_intr(); + return (ENOMEM); + } + + /* Initialize non-critical variables. */ + com->ibufold = com->ibuf; + com->ibufsize = ibufsize; + tp = com->tp; + if (tp != NULL) { + tp->t_ififosize = 2 * ibufsize; + tp->t_ispeedwat = (speed_t)-1; + tp->t_ospeedwat = (speed_t)-1; + } + + /* + * Read current input buffer, if any. Continue with interrupts + * disabled. + */ + disable_intr(); + if (com->iptr != com->ibuf) + sioinput(com); + + /*- + * Initialize critical variables, including input buffer watermarks. + * The external device is asked to stop sending when the buffer + * exactly reaches high water, or when the high level requests it. + * The high level is notified immediately (rather than at a later + * clock tick) when this watermark is reached. + * The buffer size is chosen so the watermark should almost never + * be reached. + * The low watermark is invisibly 0 since the buffer is always + * emptied all at once. + */ + com->iptr = com->ibuf = ibuf; + com->ibufend = ibuf + ibufsize; + com->ierroff = ibufsize; + com->ihighwater = ibuf + 3 * ibufsize / 4; return (0); } @@ -2941,6 +3030,8 @@ static pnpid_t siopnp_ids[] = { { 0x11007256, "USR0011"}, { 0x30207256, "USR2030"}, { 0x31307256, "USR3031"}, + { 0x90307256, "USR3090"}, + { 0x0100440e, "Cardinal MVP288IV"}, { 0 } }; |