/*- * Copyright (c) 1991 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ * from: @(#)com.c 7.5 (Berkeley) 5/16/91 * from: i386/isa sio.c,v 1.234 */ #include "opt_comconsole.h" #include "opt_compat.h" #include "opt_ddb.h" #include "opt_sio.h" #include "sio.h" /* * Serial driver, based on 386BSD-0.1 com driver. * Mostly rewritten to use pseudo-DMA. * Works for National Semiconductor NS8250-NS16550AF UARTs. * COM driver, based on HP dca driver. * * Changes for PC-Card integration: * - Added PC-Card driver table and handlers */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef SMP #include #endif #include #include #ifdef COM_ESP #include #endif #include #ifndef __i386__ #define disable_intr() #define enable_intr() #endif #ifdef SMP #define disable_intr() COM_DISABLE_INTR() #define enable_intr() COM_ENABLE_INTR() #endif /* SMP */ #define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */ #define CALLOUT_MASK 0x80 #define CONTROL_MASK 0x60 #define CONTROL_INIT_STATE 0x20 #define CONTROL_LOCK_STATE 0x40 #define DEV_TO_UNIT(dev) (MINOR_TO_UNIT(minor(dev))) #define MINOR_MAGIC_MASK (CALLOUT_MASK | CONTROL_MASK) #define MINOR_TO_UNIT(mynor) ((mynor) & ~MINOR_MAGIC_MASK) #ifdef COM_MULTIPORT /* checks in flags for multiport and which is multiport "master chip" * for a given card */ #define COM_ISMULTIPORT(flags) ((flags) & 0x01) #define COM_MPMASTER(flags) (((flags) >> 8) & 0x0ff) #define COM_NOTAST4(flags) ((flags) & 0x04) #endif /* COM_MULTIPORT */ #define COM_CONSOLE(flags) ((flags) & 0x10) #define COM_FORCECONSOLE(flags) ((flags) & 0x20) #define COM_LLCONSOLE(flags) ((flags) & 0x40) #define COM_DEBUGGER(flags) ((flags) & 0x80) #define COM_LOSESOUTINTS(flags) ((flags) & 0x08) #define COM_NOFIFO(flags) ((flags) & 0x02) #define COM_ST16650A(flags) ((flags) & 0x20000) #define COM_C_NOPROBE (0x40000) #define COM_NOPROBE(flags) ((flags) & COM_C_NOPROBE) #define COM_C_IIR_TXRDYBUG (0x80000) #define COM_IIR_TXRDYBUG(flags) ((flags) & COM_C_IIR_TXRDYBUG) #define COM_FIFOSIZE(flags) (((flags) & 0xff000000) >> 24) #define com_scr 7 /* scratch register for 16450-16550 (R/W) */ /* * 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 * off the low bits. * * The following com and tty flags correspond closely: * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and * comstop()) * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart()) * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam()) * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam()) * TS_FLUSH is not used. * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON. * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state). */ #define CS_BUSY 0x80 /* output in progress */ #define CS_TTGO 0x40 /* output not stopped by XOFF */ #define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */ #define CS_CHECKMSR 1 /* check of MSR scheduled */ #define CS_CTS_OFLOW 2 /* use CTS output flow control */ #define CS_DTR_OFF 0x10 /* DTR held off */ #define CS_ODONE 4 /* output completed */ #define CS_RTS_IFLOW 8 /* use RTS input flow control */ #define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */ static char const * const error_desc[] = { #define CE_OVERRUN 0 "silo overflow", #define CE_INTERRUPT_BUF_OVERFLOW 1 "interrupt-level buffer overflow", #define CE_TTY_BUF_OVERFLOW 2 "tty-level buffer overflow", }; #define CE_NTYPES 3 #define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum]) /* types. XXX - should be elsewhere */ typedef u_int Port_t; /* hardware port */ typedef u_char bool_t; /* boolean */ /* queue of linear buffers */ struct lbq { u_char *l_head; /* next char to process */ u_char *l_tail; /* one past the last char to process */ struct lbq *l_next; /* next in queue */ bool_t l_queued; /* nonzero if queued */ }; /* com device structure */ struct com_s { u_int flags; /* Copy isa device flags */ u_char state; /* miscellaneous flag bits */ bool_t active_out; /* nonzero if the callout device is open */ u_char cfcr_image; /* copy of value written to CFCR */ #ifdef COM_ESP bool_t esp; /* is this unit a hayes esp board? */ #endif u_char extra_state; /* more flag bits, separate for order trick */ u_char fifo_image; /* copy of value written to FIFO */ bool_t hasfifo; /* nonzero for 16550 UARTs */ bool_t st16650a; /* Is a Startech 16650A or RTS/CTS compat */ bool_t loses_outints; /* nonzero if device loses output interrupts */ u_char mcr_image; /* copy of value written to MCR */ #ifdef COM_MULTIPORT bool_t multiport; /* is this unit part of a multiport device? */ #endif /* COM_MULTIPORT */ bool_t no_irq; /* nonzero if irq is not attached */ bool_t gone; /* hardware disappeared */ bool_t poll; /* nonzero if polling is required */ bool_t poll_output; /* nonzero if polling for output is required */ int unit; /* unit number */ int dtr_wait; /* time to hold DTR down on close (* 1/hz) */ u_int tx_fifo_size; u_int wopeners; /* # processes waiting for DCD in open() */ /* * The high level of the driver never reads status registers directly * because there would be too many side effects to handle conveniently. * Instead, it reads copies of the registers stored here by the * interrupt handler. */ u_char last_modem_status; /* last MSR read by intr handler */ u_char prev_modem_status; /* last MSR handled by high level */ 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 */ Port_t data_port; /* i/o ports */ #ifdef COM_ESP Port_t esp_port; #endif Port_t int_id_port; Port_t iobase; Port_t modem_ctl_port; Port_t line_status_port; Port_t modem_status_port; Port_t intr_ctl_port; /* Ports of IIR register */ struct tty *tp; /* cross reference */ /* Initial state. */ struct termios it_in; /* should be in struct tty */ struct termios it_out; /* Lock state. */ struct termios lt_in; /* should be in struct tty */ struct termios lt_out; bool_t do_timestamp; 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; u_int delta_error_counts[CE_NTYPES]; u_long error_counts[CE_NTYPES]; struct resource *irqres; struct resource *ioportres; /* * Data area for output buffers. Someday we should build the output * buffer queue without copying data. */ u_char obuf1[256]; u_char obuf2[256]; }; #ifdef COM_ESP static int espattach __P((struct com_s *com, Port_t esp_port)); #endif static int sioattach __P((device_t dev)); static int sio_isa_attach __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)); static int comparam __P((struct tty *tp, struct termios *t)); static swihand_t siopoll; static int sioprobe __P((device_t dev)); static int sio_isa_probe __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 void comstop __P((struct tty *tp, int rw)); static timeout_t comwakeup; static void disc_optim __P((struct tty *tp, struct termios *t, struct com_s *com)); #if NCARD > 0 static int sio_pccard_attach __P((device_t dev)); static void sio_pccard_detach __P((device_t dev)); static int sio_pccard_probe __P((device_t dev)); #endif /* NCARD > 0 */ static char driver_name[] = "sio"; /* table and macro for fast conversion from a unit number to its com struct */ static devclass_t sio_devclass; #define com_addr(unit) ((struct com_s *) \ devclass_get_softc(sio_devclass, unit)) static device_method_t sio_isa_methods[] = { /* Device interface */ DEVMETHOD(device_probe, sio_isa_probe), DEVMETHOD(device_attach, sio_isa_attach), { 0, 0 } }; static driver_t sio_isa_driver = { driver_name, sio_isa_methods, sizeof(struct com_s), }; #if NCARD > 0 static device_method_t sio_pccard_methods[] = { /* Device interface */ DEVMETHOD(device_probe, sio_pccard_probe), DEVMETHOD(device_attach, sio_pccard_attach), DEVMETHOD(device_detach, sio_pccard_detach), { 0, 0 } }; static driver_t sio_pccard_driver = { driver_name, sio_pccard_methods, sizeof(struct com_s), }; #endif (NCARD > 0) static d_open_t sioopen; static d_close_t sioclose; static d_read_t sioread; static d_write_t siowrite; static d_ioctl_t sioioctl; #define CDEV_MAJOR 28 static struct cdevsw sio_cdevsw = { /* open */ sioopen, /* close */ sioclose, /* read */ sioread, /* write */ siowrite, /* ioctl */ sioioctl, /* poll */ ttypoll, /* mmap */ nommap, /* strategy */ nostrategy, /* name */ driver_name, /* maj */ CDEV_MAJOR, /* dump */ nodump, /* psize */ nopsize, /* flags */ D_TTY, /* bmaj */ -1 }; int comconsole = -1; static volatile speed_t comdefaultrate = CONSPEED; #ifdef __alpha__ static volatile speed_t gdbdefaultrate = CONSPEED; #endif static u_int com_events; /* input chars + weighted output completions */ static Port_t siocniobase; static int siocnunit; static Port_t siogdbiobase; static int siogdbunit = -1; static bool_t sio_registered; static int sio_timeout; static int sio_timeouts_until_log; static struct callout_handle sio_timeout_handle = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle); static int sio_numunits; static struct speedtab comspeedtab[] = { { 0, 0 }, { 50, COMBRD(50) }, { 75, COMBRD(75) }, { 110, COMBRD(110) }, { 134, COMBRD(134) }, { 150, COMBRD(150) }, { 200, COMBRD(200) }, { 300, COMBRD(300) }, { 600, COMBRD(600) }, { 1200, COMBRD(1200) }, { 1800, COMBRD(1800) }, { 2400, COMBRD(2400) }, { 4800, COMBRD(4800) }, { 9600, COMBRD(9600) }, { 19200, COMBRD(19200) }, { 38400, COMBRD(38400) }, { 57600, COMBRD(57600) }, { 115200, COMBRD(115200) }, { -1, -1 } }; #ifdef COM_ESP /* XXX configure this properly. */ static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, }; static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 }; #endif /* * handle sysctl read/write requests for console speed * * In addition to setting comdefaultrate for I/O through /dev/console, * also set the initial and lock values for the /dev/ttyXX device * if there is one associated with the console. Finally, if the /dev/tty * device has already been open, change the speed on the open running port * itself. */ static int sysctl_machdep_comdefaultrate SYSCTL_HANDLER_ARGS { int error, s; speed_t newspeed; struct com_s *com; struct tty *tp; newspeed = comdefaultrate; error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req); if (error || !req->newptr) return (error); comdefaultrate = newspeed; if (comconsole < 0) /* serial console not selected? */ return (0); com = com_addr(comconsole); if (!com) return (ENXIO); /* * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX * (note, the lock rates really are boolean -- if non-zero, disallow * speed changes) */ com->it_in.c_ispeed = com->it_in.c_ospeed = com->lt_in.c_ispeed = com->lt_in.c_ospeed = com->it_out.c_ispeed = com->it_out.c_ospeed = com->lt_out.c_ispeed = com->lt_out.c_ospeed = comdefaultrate; /* * if we're open, change the running rate too */ tp = com->tp; if (tp && (tp->t_state & TS_ISOPEN)) { tp->t_termios.c_ispeed = tp->t_termios.c_ospeed = comdefaultrate; s = spltty(); error = comparam(tp, &tp->t_termios); splx(s); } return error; } SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW, 0, 0, sysctl_machdep_comdefaultrate, "I", ""); #define SET_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) | (bit)) #define CLR_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) & ~(bit)) #if NCARD > 0 static int sio_pccard_probe(dev) device_t dev; { /* Do not probe IRQ - pccardd has not arranged for it yet */ /* XXX Actually it has been asigned to you, but isn't activated */ /* XXX until you specifically activate the resource for your use. */ SET_FLAG(dev, COM_C_NOPROBE); return (sioprobe(dev)); } static int sio_pccard_attach(dev) device_t dev; { return (sioattach(dev)); } /* * sio_detach - unload the driver and clear the table. * XXX TODO: * This is usually called when the card is ejected, but * can be caused by a modunload of a controller driver. * The idea is to reset the driver's view of the device * and ensure that any driver entry points such as * read and write do not hang. */ static int sio_pccard_detach(dev) device_t dev; { struct com_s *com; com = (struct com_s *) device_get_softc(dev); if (!com) { device_printf(dev, "NULL com in siounload\n"); return; } if (!com->iobase) { device_printf(dev, "already unloaded!\n"); return; } if (com->tp && (com->tp->t_state & TS_ISOPEN)) { com->gone = 1; device_printf(dev, "unload\n"); com->tp->t_gen++; ttyclose(com->tp); ttwakeup(com->tp); ttwwakeup(com->tp); } else { if (com->ibuf != NULL) free(com->ibuf, M_DEVBUF); free(com, M_DEVBUF); device_printf(dev, "unload,gone\n"); } return (0); } #endif /* NCARD > 0 */ static struct isa_pnp_id sio_ids[] = { {0x0005d041, "Standard PC COM port"}, /* PNP0500 */ {0x0105d041, "16550A-compatible COM port"}, /* PNP0501 */ {0x0205d041, "Multiport serial device (non-intelligent 16550)"}, /* PNP0502 */ {0x1005d041, "Generic IRDA-compatible device"}, /* PNP0510 */ {0x1105d041, "Generic IRDA-compatible device"}, /* PNP0511 */ {0x01017256, NULL}, /* USR0101 */ {0x30207256, NULL}, /* USR2030 */ {0x31307256, NULL}, /* USR3031 */ {0x8020b04e, NULL}, /* SUP2080 */ {0x8024b04e, NULL}, /* SUP2480 */ {0} }; static int sio_isa_probe(dev) device_t dev; { /* Check isapnp ids */ if (ISA_PNP_PROBE(device_get_parent(dev), dev, sio_ids) == ENXIO) return (ENXIO); return (sioprobe(dev)); } static int sioprobe(dev) device_t dev; { #if 0 static bool_t already_init; device_t xdev; #endif bool_t failures[10]; int fn; device_t idev; Port_t iobase; intrmask_t irqmap[4]; intrmask_t irqs; u_char mcr_image; int result; #ifdef COM_MULTIPORT Port_t xiobase; #endif int xirq; u_int flags = device_get_flags(dev); int rid; struct resource *port; rid = 0; port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, IO_COMSIZE, RF_ACTIVE); if (!port) return ENXIO; #if 0 /* * XXX this is broken - when we are first called, there are no * previously configured IO ports. We could hard code * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse. * This code has been doing nothing since the conversion since * "count" is zero the first time around. */ if (!already_init) { /* * Turn off MCR_IENABLE for all likely serial ports. An unused * port with its MCR_IENABLE gate open will inhibit interrupts * from any used port that shares the interrupt vector. * XXX the gate enable is elsewhere for some multiports. */ device_t *devs; int count, i, xioport; devclass_get_devices(sio_devclass, &devs, &count); for (i = 0; i < count; i++) { xdev = devs[i]; xioport = bus_get_resource_start(xdev, SYS_RES_IOPORT, 0); if (device_is_enabled(xdev) && xioport > 0) outb(xioport + com_mcr, 0); } free(devs, M_TEMP); already_init = TRUE; } #endif if (COM_LLCONSOLE(flags)) { printf("sio%d: reserved for low-level i/o\n", device_get_unit(dev)); return (ENXIO); } /* * If the device is on a multiport card and has an AST/4 * compatible interrupt control register, initialize this * register and prepare to leave MCR_IENABLE clear in the mcr. * Otherwise, prepare to set MCR_IENABLE in the mcr. * Point idev to the device struct giving the correct id_irq. * This is the struct for the master device if there is one. */ idev = dev; mcr_image = MCR_IENABLE; #ifdef COM_MULTIPORT if (COM_ISMULTIPORT(flags) && !COM_NOTAST4(flags)) { idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags)); if (idev == NULL) { printf("sio%d: master device %d not configured\n", device_get_unit(dev), COM_MPMASTER(flags)); idev = dev; } xiobase = bus_get_resource_start(idev, SYS_RES_IOPORT, 0); if (xiobase > 0) { xirq = bus_get_resource_start(idev, SYS_RES_IRQ, 0); outb(xiobase + com_scr, xirq >= 0 ? 0x80 : 0); } mcr_image = 0; } #endif /* COM_MULTIPORT */ if (bus_get_resource_start(idev, SYS_RES_IRQ, 0) <= 0) mcr_image = 0; bzero(failures, sizeof failures); iobase = rman_get_start(port); /* * We don't want to get actual interrupts, just masked ones. * Interrupts from this line should already be masked in the ICU, * but mask them in the processor as well in case there are some * (misconfigured) shared interrupts. */ disable_intr(); /* EXTRA DELAY? */ /* * Initialize the speed and the word size and wait long enough to * drain the maximum of 16 bytes of junk in device output queues. * The speed is undefined after a master reset and must be set * before relying on anything related to output. There may be * junk after a (very fast) soft reboot and (apparently) after * master reset. * XXX what about the UART bug avoided by waiting in comparam()? * We don't want to to wait long enough to drain at 2 bps. */ if (iobase == siocniobase) DELAY((16 + 1) * 1000000 / (comdefaultrate / 10)); else { outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); outb(iobase + com_dlbl, COMBRD(SIO_TEST_SPEED) & 0xff); outb(iobase + com_dlbh, (u_int) COMBRD(SIO_TEST_SPEED) >> 8); outb(iobase + com_cfcr, CFCR_8BITS); DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10)); } /* * Enable the interrupt gate and disable device interupts. This * should leave the device driving the interrupt line low and * guarantee an edge trigger if an interrupt can be generated. */ /* EXTRA DELAY? */ outb(iobase + com_mcr, mcr_image); outb(iobase + com_ier, 0); DELAY(1000); /* XXX */ irqmap[0] = isa_irq_pending(); /* * Attempt to set loopback mode so that we can send a null byte * without annoying any external device. */ /* EXTRA DELAY? */ outb(iobase + com_mcr, mcr_image | MCR_LOOPBACK); /* * Attempt to generate an output interrupt. On 8250's, setting * IER_ETXRDY generates an interrupt independent of the current * setting and independent of whether the THR is empty. On 16450's, * setting IER_ETXRDY generates an interrupt independent of the * current setting. On 16550A's, setting IER_ETXRDY only * generates an interrupt when IER_ETXRDY is not already set. */ outb(iobase + com_ier, IER_ETXRDY); /* * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate * an interrupt. They'd better generate one for actually doing * output. Loopback may be broken on the same incompatibles but * it's unlikely to do more than allow the null byte out. */ outb(iobase + com_data, 0); DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10)); /* * Turn off loopback mode so that the interrupt gate works again * (MCR_IENABLE was hidden). This should leave the device driving * an interrupt line high. It doesn't matter if the interrupt * line oscillates while we are not looking at it, since interrupts * are disabled. */ /* EXTRA DELAY? */ outb(iobase + com_mcr, mcr_image); /* * Some pcmcia cards have the "TXRDY bug", so we check everyone * for IIR_TXRDY implementation ( Palido 321s, DC-1S... ) */ if (COM_NOPROBE(flags)) { /* Reading IIR register twice */ for (fn = 0; fn < 2; fn ++) { DELAY(10000); failures[6] = inb(iobase + com_iir); } /* Check IIR_TXRDY clear ? */ result = 0; if (failures[6] & IIR_TXRDY) { /* Nop, Double check with clearing IER */ outb(iobase + com_ier, 0); if (inb(iobase + com_iir) & IIR_NOPEND) { /* Ok. we're familia this gang */ SET_FLAG(dev, COM_C_IIR_TXRDYBUG); } else { /* Unknown, Just omit this chip.. XXX */ result = ENXIO; } } else { /* OK. this is well-known guys */ CLR_FLAG(dev, COM_C_IIR_TXRDYBUG); } outb(iobase + com_cfcr, CFCR_8BITS); enable_intr(); bus_release_resource(dev, SYS_RES_IOPORT, rid, port); return (iobase == siocniobase ? 0 : result); } /* * Check that * o the CFCR, IER and MCR in UART hold the values written to them * (the values happen to be all distinct - this is good for * avoiding false positive tests from bus echoes). * o an output interrupt is generated and its vector is correct. * o the interrupt goes away when the IIR in the UART is read. */ /* EXTRA DELAY? */ failures[0] = inb(iobase + com_cfcr) - CFCR_8BITS; failures[1] = inb(iobase + com_ier) - IER_ETXRDY; failures[2] = inb(iobase + com_mcr) - mcr_image; DELAY(10000); /* Some internal modems need this time */ irqmap[1] = isa_irq_pending(); failures[4] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_TXRDY; DELAY(1000); /* XXX */ irqmap[2] = isa_irq_pending(); failures[6] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_NOPEND; /* * Turn off all device interrupts and check that they go off properly. * Leave MCR_IENABLE alone. For ports without a master port, it gates * the OUT2 output of the UART to * the ICU input. Closing the gate would give a floating ICU input * (unless there is another device driving it) and spurious interrupts. * (On the system that this was first tested on, the input floats high * and gives a (masked) interrupt as soon as the gate is closed.) */ outb(iobase + com_ier, 0); outb(iobase + com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */ failures[7] = inb(iobase + com_ier); DELAY(1000); /* XXX */ irqmap[3] = isa_irq_pending(); failures[9] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_NOPEND; enable_intr(); irqs = irqmap[1] & ~irqmap[0]; xirq = bus_get_resource_start(idev, SYS_RES_IRQ, 0); if (xirq >= 0 && ((1 << xirq) & irqs) == 0) printf( "sio%d: configured irq %d not in bitmap of probed irqs %#x\n", device_get_unit(dev), xirq, irqs); if (bootverbose) printf("sio%d: irq maps: %#x %#x %#x %#x\n", device_get_unit(dev), irqmap[0], irqmap[1], irqmap[2], irqmap[3]); result = 0; for (fn = 0; fn < sizeof failures; ++fn) if (failures[fn]) { outb(iobase + com_mcr, 0); result = ENXIO; if (bootverbose) { printf("sio%d: probe failed test(s):", device_get_unit(dev)); for (fn = 0; fn < sizeof failures; ++fn) if (failures[fn]) printf(" %d", fn); printf("\n"); } break; } bus_release_resource(dev, SYS_RES_IOPORT, rid, port); return (iobase == siocniobase ? 0 : result); } #ifdef COM_ESP static int espattach(com, esp_port) struct com_s *com; Port_t esp_port; { u_char dips; u_char val; /* * Check the ESP-specific I/O port to see if we're an ESP * card. If not, return failure immediately. */ if ((inb(esp_port) & 0xf3) == 0) { printf(" port 0x%x is not an ESP board?\n", esp_port); return (0); } /* * We've got something that claims to be a Hayes ESP card. * Let's hope so. */ /* Get the dip-switch configuration */ outb(esp_port + ESP_CMD1, ESP_GETDIPS); dips = inb(esp_port + ESP_STATUS1); /* * Bits 0,1 of dips say which COM port we are. */ if (com->iobase == likely_com_ports[dips & 0x03]) printf(" : ESP"); else { printf(" esp_port has com %d\n", dips & 0x03); return (0); } /* * Check for ESP version 2.0 or later: bits 4,5,6 = 010. */ outb(esp_port + ESP_CMD1, ESP_GETTEST); val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */ val = inb(esp_port + ESP_STATUS2); if ((val & 0x70) < 0x20) { printf("-old (%o)", val & 0x70); return (0); } /* * Check for ability to emulate 16550: bit 7 == 1 */ if ((dips & 0x80) == 0) { printf(" slave"); return (0); } /* * Okay, we seem to be a Hayes ESP card. Whee. */ com->esp = TRUE; com->esp_port = esp_port; return (1); } #endif /* COM_ESP */ static int sio_isa_attach(dev) device_t dev; { return (sioattach(dev)); } static int sioattach(dev) device_t dev; { struct com_s *com; #ifdef COM_ESP Port_t *espp; #endif Port_t iobase; int irq; int unit; void *ih; u_int flags; int rid; struct resource *port; int ret; rid = 0; port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, IO_COMSIZE, RF_ACTIVE); if (!port) return ENXIO; iobase = rman_get_start(port); irq = bus_get_resource_start(dev, SYS_RES_IRQ, 0); unit = device_get_unit(dev); com = device_get_softc(dev); flags = device_get_flags(dev); if (unit >= sio_numunits) sio_numunits = unit + 1; /* * sioprobe() has initialized the device registers as follows: * o cfcr = CFCR_8BITS. * It is most important that CFCR_DLAB is off, so that the * data port is not hidden when we enable interrupts. * o ier = 0. * Interrupts are only enabled when the line is open. * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible * interrupt control register or the config specifies no irq. * Keeping MCR_DTR and MCR_RTS off might stop the external * device from sending before we are ready. */ bzero(com, sizeof *com); com->unit = unit; com->ioportres = port; com->cfcr_image = CFCR_8BITS; com->dtr_wait = 3 * hz; com->loses_outints = COM_LOSESOUTINTS(flags) != 0; com->no_irq = irq < 0; com->tx_fifo_size = 1; com->obufs[0].l_head = com->obuf1; com->obufs[1].l_head = com->obuf2; com->iobase = iobase; com->data_port = iobase + com_data; com->int_id_port = iobase + com_iir; com->modem_ctl_port = iobase + com_mcr; com->mcr_image = inb(com->modem_ctl_port); com->line_status_port = iobase + com_lsr; com->modem_status_port = iobase + com_msr; com->intr_ctl_port = iobase + com_ier; /* * We don't use all the flags from since they * are only relevant for logins. It's important to have echo off * initially so that the line doesn't start blathering before the * echo flag can be turned off. */ com->it_in.c_iflag = 0; com->it_in.c_oflag = 0; com->it_in.c_cflag = TTYDEF_CFLAG; com->it_in.c_lflag = 0; if (unit == comconsole) { com->it_in.c_iflag = TTYDEF_IFLAG; com->it_in.c_oflag = TTYDEF_OFLAG; com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL; com->it_in.c_lflag = TTYDEF_LFLAG; com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL; com->lt_out.c_ispeed = com->lt_out.c_ospeed = com->lt_in.c_ispeed = com->lt_in.c_ospeed = 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; /* attempt to determine UART type */ printf("sio%d: type", unit); #ifdef COM_MULTIPORT if (!COM_ISMULTIPORT(flags) && !COM_IIR_TXRDYBUG(flags)) #else if (!COM_IIR_TXRDYBUG(flags)) #endif { u_char scr; u_char scr1; u_char scr2; scr = inb(iobase + com_scr); outb(iobase + com_scr, 0xa5); scr1 = inb(iobase + com_scr); outb(iobase + com_scr, 0x5a); scr2 = inb(iobase + com_scr); outb(iobase + com_scr, scr); if (scr1 != 0xa5 || scr2 != 0x5a) { printf(" 8250"); goto determined_type; } } outb(iobase + com_fifo, FIFO_ENABLE | FIFO_RX_HIGH); DELAY(100); com->st16650a = 0; switch (inb(com->int_id_port) & IIR_FIFO_MASK) { case FIFO_RX_LOW: printf(" 16450"); break; case FIFO_RX_MEDL: printf(" 16450?"); break; case FIFO_RX_MEDH: printf(" 16550?"); break; case FIFO_RX_HIGH: if (COM_NOFIFO(flags)) { printf(" 16550A fifo disabled"); } else { com->hasfifo = TRUE; if (COM_ST16650A(flags)) { com->st16650a = 1; com->tx_fifo_size = 32; printf(" ST16650A"); } else { com->tx_fifo_size = COM_FIFOSIZE(flags); printf(" 16550A"); } } #ifdef COM_ESP for (espp = likely_esp_ports; *espp != 0; espp++) if (espattach(com, *espp)) { com->tx_fifo_size = 1024; break; } #endif if (!com->st16650a) { if (!com->tx_fifo_size) com->tx_fifo_size = 16; else printf(" lookalike with %d bytes FIFO", com->tx_fifo_size); } break; } #ifdef COM_ESP if (com->esp) { /* * Set 16550 compatibility mode. * We don't use the ESP_MODE_SCALE bit to increase the * fifo trigger levels because we can't handle large * bursts of input. * XXX flow control should be set in comparam(), not here. */ outb(com->esp_port + ESP_CMD1, ESP_SETMODE); outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO); /* Set RTS/CTS flow control. */ outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE); outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS); outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS); /* Set flow-control levels. */ outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW); outb(com->esp_port + ESP_CMD2, HIBYTE(768)); outb(com->esp_port + ESP_CMD2, LOBYTE(768)); outb(com->esp_port + ESP_CMD2, HIBYTE(512)); outb(com->esp_port + ESP_CMD2, LOBYTE(512)); } #endif /* COM_ESP */ outb(iobase + com_fifo, 0); determined_type: ; #ifdef COM_MULTIPORT if (COM_ISMULTIPORT(flags)) { device_t masterdev; int irq; com->multiport = TRUE; printf(" (multiport"); if (unit == COM_MPMASTER(flags)) printf(" master"); printf(")"); masterdev = devclass_get_device(sio_devclass, COM_MPMASTER(flags)); irq = bus_get_resource_start(masterdev, SYS_RES_IRQ, 0); com->no_irq = irq < 0; } #endif /* COM_MULTIPORT */ if (unit == comconsole) printf(", console"); if (COM_IIR_TXRDYBUG(flags)) printf(" with a bogus IIR_TXRDY register"); printf("\n"); if (!sio_registered) { register_swi(SWI_TTY, siopoll); sio_registered = TRUE; } make_dev(&sio_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600, "ttyd%r", unit); make_dev(&sio_cdevsw, unit | CONTROL_INIT_STATE, UID_ROOT, GID_WHEEL, 0600, "ttyid%r", unit); make_dev(&sio_cdevsw, unit | CONTROL_LOCK_STATE, UID_ROOT, GID_WHEEL, 0600, "ttyld%r", unit); make_dev(&sio_cdevsw, unit | CALLOUT_MASK, UID_UUCP, GID_DIALER, 0660, "cuaa%r", unit); make_dev(&sio_cdevsw, unit | CALLOUT_MASK | CONTROL_INIT_STATE, UID_UUCP, GID_DIALER, 0660, "cuaia%r", unit); make_dev(&sio_cdevsw, unit | CALLOUT_MASK | CONTROL_LOCK_STATE, UID_UUCP, GID_DIALER, 0660, "cuala%r", unit); com->flags = flags; com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; pps_init(&com->pps); rid = 0; com->irqres = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0ul, ~0ul, 1, RF_ACTIVE); if (com->irqres) { ret = BUS_SETUP_INTR(device_get_parent(dev), dev, com->irqres, INTR_TYPE_TTY | INTR_TYPE_FAST, siointr, com, &ih); if (ret) device_printf(dev, "could not activate interrupt\n"); } return (0); } static int sioopen(dev, flag, mode, p) dev_t dev; int flag; int mode; struct proc *p; { struct com_s *com; int error; Port_t iobase; int mynor; int s; struct tty *tp; int unit; mynor = minor(dev); unit = MINOR_TO_UNIT(mynor); com = com_addr(unit); if (com == NULL) return (ENXIO); if (com->gone) return (ENXIO); if (mynor & CONTROL_MASK) return (0); tp = dev->si_tty = com->tp = ttymalloc(com->tp); s = spltty(); /* * We jump to this label after all non-interrupted sleeps to pick * up any changes of the device state. */ open_top: while (com->state & CS_DTR_OFF) { error = tsleep(&com->dtr_wait, TTIPRI | PCATCH, "siodtr", 0); if (com_addr(unit) == NULL) return (ENXIO); if (error != 0 || com->gone) goto out; } if (tp->t_state & TS_ISOPEN) { /* * The device is open, so everything has been initialized. * Handle conflicts. */ if (mynor & CALLOUT_MASK) { if (!com->active_out) { error = EBUSY; goto out; } } else { if (com->active_out) { if (flag & O_NONBLOCK) { error = EBUSY; goto out; } error = tsleep(&com->active_out, TTIPRI | PCATCH, "siobi", 0); if (com_addr(unit) == NULL) return (ENXIO); if (error != 0 || com->gone) goto out; goto open_top; } } if (tp->t_state & TS_XCLUDE && suser(p)) { error = EBUSY; goto out; } } else { /* * The device isn't open, so there are no conflicts. * Initialize it. Initialization is done twice in many * cases: to preempt sleeping callin opens if we are * callout, and to complete a callin open after DCD rises. */ tp->t_oproc = comstart; tp->t_param = comparam; tp->t_stop = comstop; tp->t_dev = dev; tp->t_termios = mynor & CALLOUT_MASK ? com->it_out : com->it_in; (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET); com->poll = com->no_irq; com->poll_output = com->loses_outints; ++com->wopeners; error = comparam(tp, &tp->t_termios); --com->wopeners; if (error != 0) goto out; /* * XXX we should goto open_top if comparam() slept. */ iobase = com->iobase; if (com->hasfifo) { /* * (Re)enable and drain fifos. * * Certain SMC chips cause problems if the fifos * are enabled while input is ready. Turn off the * fifo if necessary to clear the input. We test * the input ready bit after enabling the fifos * since we've already enabled them in comparam() * and to handle races between enabling and fresh * input. */ while (TRUE) { outb(iobase + com_fifo, FIFO_RCV_RST | FIFO_XMT_RST | com->fifo_image); /* * XXX the delays are for superstitious * historical reasons. It must be less than * the character time at the maximum * supported speed (87 usec at 115200 bps * 8N1). Otherwise we might loop endlessly * if data is streaming in. We used to use * delays of 100. That usually worked * because DELAY(100) used to usually delay * for about 85 usec instead of 100. */ DELAY(50); if (!(inb(com->line_status_port) & LSR_RXRDY)) break; outb(iobase + com_fifo, 0); DELAY(50); (void) inb(com->data_port); } } disable_intr(); (void) inb(com->line_status_port); (void) inb(com->data_port); com->prev_modem_status = com->last_modem_status = inb(com->modem_status_port); if (COM_IIR_TXRDYBUG(com->flags)) { outb(com->intr_ctl_port, IER_ERXRDY | IER_ERLS | IER_EMSC); } else { outb(com->intr_ctl_port, IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC); } enable_intr(); /* * Handle initial DCD. Callout devices get a fake initial * DCD (trapdoor DCD). If we are callout, then any sleeping * callin opens get woken up and resume sleeping on "siobi" * instead of "siodcd". */ /* * XXX `mynor & CALLOUT_MASK' should be * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where * TRAPDOOR_CARRIER is the default initial state for callout * devices and SOFT_CARRIER is like CLOCAL except it hides * the true carrier. */ if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK) (*linesw[tp->t_line].l_modem)(tp, 1); } /* * Wait for DCD if necessary. */ if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK) && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { ++com->wopeners; error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "siodcd", 0); if (com_addr(unit) == NULL) return (ENXIO); --com->wopeners; if (error != 0 || com->gone) goto out; goto open_top; } error = (*linesw[tp->t_line].l_open)(dev, tp); disc_optim(tp, &tp->t_termios, com); if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK) com->active_out = TRUE; siosettimeout(); out: splx(s); if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0) comhardclose(com); return (error); } static int sioclose(dev, flag, mode, p) dev_t dev; int flag; int mode; struct proc *p; { struct com_s *com; int mynor; int s; struct tty *tp; mynor = minor(dev); if (mynor & CONTROL_MASK) return (0); com = com_addr(MINOR_TO_UNIT(mynor)); tp = com->tp; s = spltty(); (*linesw[tp->t_line].l_close)(tp, flag); disc_optim(tp, &tp->t_termios, com); comstop(tp, FREAD | FWRITE); comhardclose(com); ttyclose(tp); siosettimeout(); splx(s); 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); free(com, M_DEVBUF); splx(s); } return (0); } static void comhardclose(com) struct com_s *com; { Port_t iobase; int s; struct tty *tp; int unit; unit = com->unit; iobase = com->iobase; s = spltty(); com->poll = FALSE; 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); tp = com->tp; if (tp->t_cflag & HUPCL /* * XXX we will miss any carrier drop between here and the * next open. Perhaps we should watch DCD even when the * port is closed; it is not sufficient to check it at * the next open because it might go up and down while * we're not watching. */ || (!com->active_out && !(com->prev_modem_status & MSR_DCD) && !(com->it_in.c_cflag & CLOCAL)) || !(tp->t_state & TS_ISOPEN)) { (void)commctl(com, TIOCM_DTR, DMBIC); if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) { timeout(siodtrwakeup, com, com->dtr_wait); com->state |= CS_DTR_OFF; } } } if (com->hasfifo) { /* * Disable fifos so that they are off after controlled * reboots. Some BIOSes fail to detect 16550s when the * fifos are enabled. */ outb(iobase + com_fifo, 0); } com->active_out = FALSE; wakeup(&com->active_out); wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */ splx(s); } static int sioread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { int mynor; struct com_s *com; mynor = minor(dev); if (mynor & CONTROL_MASK) return (ENODEV); com = com_addr(MINOR_TO_UNIT(mynor)); if (com->gone) return (ENODEV); return ((*linesw[com->tp->t_line].l_read)(com->tp, uio, flag)); } static int siowrite(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { int mynor; struct com_s *com; int unit; mynor = minor(dev); if (mynor & CONTROL_MASK) return (ENODEV); unit = MINOR_TO_UNIT(mynor); com = com_addr(unit); if (com->gone) return (ENODEV); /* * (XXX) We disallow virtual consoles if the physical console is * a serial port. This is in case there is a display attached that * is not the console. In that situation we don't need/want the X * server taking over the console. */ if (constty != NULL && unit == comconsole) constty = NULL; return ((*linesw[com->tp->t_line].l_write)(com->tp, uio, flag)); } static void siobusycheck(chan) void *chan; { struct com_s *com; int s; com = (struct com_s *)chan; /* * Clear TS_BUSY if low-level output is complete. * spl locking is sufficient because siointr1() does not set CS_BUSY. * If siointr1() clears CS_BUSY after we look at it, then we'll get * called again. Reading the line status port outside of siointr1() * is safe because CS_BUSY is clear so there are no output interrupts * to lose. */ s = spltty(); if (com->state & CS_BUSY) com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */ else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY)) == (LSR_TSRE | LSR_TXRDY)) { com->tp->t_state &= ~TS_BUSY; ttwwakeup(com->tp); com->extra_state &= ~CSE_BUSYCHECK; } else timeout(siobusycheck, com, hz / 100); splx(s); } static void siodtrwakeup(chan) void *chan; { struct com_s *com; com = (struct com_s *)chan; com->state &= ~CS_DTR_OFF; 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; { #ifndef COM_MULTIPORT COM_LOCK(); siointr1((struct com_s *) arg); COM_UNLOCK(); #else /* COM_MULTIPORT */ bool_t possibly_more_intrs; int unit; struct com_s *com; /* * Loop until there is no activity on any port. This is necessary * to get an interrupt edge more than to avoid another interrupt. * If the IRQ signal is just an OR of the IRQ signals from several * devices, then the edge from one may be lost because another is * on. */ COM_LOCK(); do { possibly_more_intrs = FALSE; for (unit = 0; unit < sio_numunits; ++unit) { com = com_addr(unit); /* * XXX COM_LOCK(); * would it work here, or be counter-productive? */ if (com != NULL && !com->gone && (inb(com->int_id_port) & IIR_IMASK) != IIR_NOPEND) { siointr1(com); possibly_more_intrs = TRUE; } /* XXX COM_UNLOCK(); */ } } while (possibly_more_intrs); COM_UNLOCK(); #endif /* COM_MULTIPORT */ } static void siointr1(com) struct com_s *com; { u_char line_status; u_char modem_status; u_char *ioptr; 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_CAPTUREASSERT : PPS_CAPTURECLEAR); } } line_status = inb(com->line_status_port); /* input event? (check first to help avoid overruns) */ while (line_status & LSR_RCV_MASK) { /* break/unnattached error bits or real input? */ if (!(line_status & LSR_RXRDY)) recv_data = 0; else recv_data = inb(com->data_port); if (line_status & (LSR_BI | LSR_FE | LSR_PE)) { /* * Don't store BI if IGNBRK or FE/PE if IGNPAR. * Otherwise, push the work to a higher level * (to handle PARMRK) if we're bypassing. * Otherwise, convert BI/FE and PE+INPCK to 0. * * This makes bypassing work right in the * usual "raw" case (IGNBRK set, and IGNPAR * and INPCK clear). * * Note: BI together with FE/PE means just BI. */ if (line_status & LSR_BI) { #if defined(DDB) && defined(BREAK_TO_DEBUGGER) if (com->unit == comconsole) { breakpoint(); goto cont; } #endif if (com->tp == NULL || com->tp->t_iflag & IGNBRK) goto cont; } else { if (com->tp == NULL || com->tp->t_iflag & IGNPAR) goto cont; } if (com->tp->t_state & TS_CAN_BYPASS_L_RINT && (line_status & (LSR_BI | LSR_FE) || com->tp->t_iflag & INPCK)) recv_data = 0; } ++com->bytes_in; if (com->hotchar != 0 && recv_data == com->hotchar) setsofttty(); ioptr = com->iptr; if (ioptr >= com->ibufend) CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW); else { if (com->do_timestamp) microtime(&com->timestamp); ++com_events; schedsofttty(); #if 0 /* for testing input latency vs efficiency */ if (com->iptr - com->ibuf == 8) setsofttty(); #endif ioptr[0] = recv_data; ioptr[com->ierroff] = line_status; com->iptr = ++ioptr; if (ioptr == com->ihighwater && com->state & CS_RTS_IFLOW) outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); if (line_status & LSR_OE) CE_RECORD(com, CE_OVERRUN); } cont: /* * "& 0x7F" is to avoid the gcc-1.40 generating a slow * jump from the top of the loop to here */ line_status = inb(com->line_status_port) & 0x7F; } /* modem status change? (always check before doing output) */ modem_status = inb(com->modem_status_port); if (modem_status != com->last_modem_status) { if (com->do_dcd_timestamp && !(com->last_modem_status & MSR_DCD) && modem_status & MSR_DCD) microtime(&com->dcd_timestamp); /* * Schedule high level to handle DCD changes. Note * that we don't use the delta bits anywhere. Some * UARTs mess them up, and it's easy to remember the * previous bits and calculate the delta. */ com->last_modem_status = modem_status; if (!(com->state & CS_CHECKMSR)) { com_events += LOTS_OF_EVENTS; com->state |= CS_CHECKMSR; setsofttty(); } /* handle CTS change immediately for crisp flow ctl */ if (com->state & CS_CTS_OFLOW) { if (modem_status & MSR_CTS) com->state |= CS_ODEVREADY; else com->state &= ~CS_ODEVREADY; } } /* output queued and everything ready? */ if (line_status & LSR_TXRDY && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) { ioptr = com->obufq.l_head; if (com->tx_fifo_size > 1) { u_int ocount; ocount = com->obufq.l_tail - ioptr; if (ocount > com->tx_fifo_size) ocount = com->tx_fifo_size; com->bytes_out += ocount; do outb(com->data_port, *ioptr++); while (--ocount != 0); } else { outb(com->data_port, *ioptr++); ++com->bytes_out; } com->obufq.l_head = ioptr; if (COM_IIR_TXRDYBUG(com->flags)) { int_ctl_new = int_ctl | IER_ETXRDY; } if (ioptr >= com->obufq.l_tail) { struct lbq *qp; qp = com->obufq.l_next; qp->l_queued = FALSE; qp = qp->l_next; if (qp != NULL) { com->obufq.l_head = qp->l_head; com->obufq.l_tail = qp->l_tail; com->obufq.l_next = qp; } else { /* output just completed */ if (COM_IIR_TXRDYBUG(com->flags)) { int_ctl_new = int_ctl & ~IER_ETXRDY; } com->state &= ~CS_BUSY; } if (!(com->state & CS_ODONE)) { com_events += LOTS_OF_EVENTS; com->state |= CS_ODONE; setsofttty(); /* handle at high level ASAP */ } } if (COM_IIR_TXRDYBUG(com->flags) && (int_ctl != int_ctl_new)) { outb(com->intr_ctl_port, int_ctl_new); } } /* finished? */ #ifndef COM_MULTIPORT if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND) #endif /* COM_MULTIPORT */ return; } } static int sioioctl(dev, cmd, data, flag, p) dev_t dev; u_long cmd; caddr_t data; int flag; struct proc *p; { struct com_s *com; int error; Port_t iobase; int mynor; int s; struct tty *tp; #if defined(COMPAT_43) || defined(COMPAT_SUNOS) u_long oldcmd; struct termios term; #endif mynor = minor(dev); com = com_addr(MINOR_TO_UNIT(mynor)); if (com->gone) return (ENODEV); iobase = com->iobase; if (mynor & CONTROL_MASK) { struct termios *ct; switch (mynor & CONTROL_MASK) { case CONTROL_INIT_STATE: ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in; break; case CONTROL_LOCK_STATE: ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in; break; default: return (ENODEV); /* /dev/nodev */ } switch (cmd) { case TIOCSETA: error = suser(p); if (error != 0) return (error); *ct = *(struct termios *)data; return (0); case TIOCGETA: *(struct termios *)data = *ct; return (0); case TIOCGETD: *(int *)data = TTYDISC; return (0); case TIOCGWINSZ: bzero(data, sizeof(struct winsize)); return (0); default: return (ENOTTY); } } tp = com->tp; #if defined(COMPAT_43) || defined(COMPAT_SUNOS) term = tp->t_termios; oldcmd = cmd; error = ttsetcompat(tp, &cmd, data, &term); if (error != 0) return (error); if (cmd != oldcmd) data = (caddr_t)&term; #endif if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { int cc; struct termios *dt = (struct termios *)data; struct termios *lt = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in; dt->c_iflag = (tp->t_iflag & lt->c_iflag) | (dt->c_iflag & ~lt->c_iflag); dt->c_oflag = (tp->t_oflag & lt->c_oflag) | (dt->c_oflag & ~lt->c_oflag); dt->c_cflag = (tp->t_cflag & lt->c_cflag) | (dt->c_cflag & ~lt->c_cflag); dt->c_lflag = (tp->t_lflag & lt->c_lflag) | (dt->c_lflag & ~lt->c_lflag); for (cc = 0; cc < NCCS; ++cc) if (lt->c_cc[cc] != 0) dt->c_cc[cc] = tp->t_cc[cc]; if (lt->c_ispeed != 0) dt->c_ispeed = tp->t_ispeed; if (lt->c_ospeed != 0) dt->c_ospeed = tp->t_ospeed; } error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); if (error != ENOIOCTL) return (error); s = spltty(); error = ttioctl(tp, cmd, data, flag); disc_optim(tp, &tp->t_termios, com); if (error != ENOIOCTL) { splx(s); return (error); } switch (cmd) { case TIOCSBRK: outb(iobase + com_cfcr, com->cfcr_image |= CFCR_SBREAK); break; case TIOCCBRK: outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); break; case TIOCSDTR: (void)commctl(com, TIOCM_DTR, DMBIS); break; 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; case TIOCMBIS: (void)commctl(com, *(int *)data, DMBIS); break; case TIOCMBIC: (void)commctl(com, *(int *)data, DMBIC); break; case TIOCMGET: *(int *)data = commctl(com, 0, DMGET); break; case TIOCMSDTRWAIT: /* must be root since the wait applies to following logins */ error = suser(p); if (error != 0) { splx(s); return (error); } com->dtr_wait = *(int *)data * hz / 100; break; case TIOCMGDTRWAIT: *(int *)data = com->dtr_wait * 100 / hz; break; case TIOCTIMESTAMP: com->do_timestamp = TRUE; *(struct timeval *)data = com->timestamp; break; case TIOCDCDTIMESTAMP: com->do_dcd_timestamp = TRUE; *(struct timeval *)data = com->dcd_timestamp; break; default: splx(s); error = pps_ioctl(cmd, data, &com->pps); if (error == ENODEV) error = ENOTTY; return (error); } splx(s); return (0); } static void siopoll() { int unit; if (com_events == 0) return; repeat: for (unit = 0; unit < sio_numunits; ++unit) { struct com_s *com; int incc; struct tty *tp; com = com_addr(unit); if (com == NULL) continue; tp = com->tp; if (tp == NULL || com->gone) { /* * Discard any events related to never-opened or * going-away devices. */ disable_intr(); incc = com->iptr - com->ibuf; com->iptr = com->ibuf; if (com->state & CS_CHECKMSR) { incc += LOTS_OF_EVENTS; com->state &= ~CS_CHECKMSR; } com_events -= incc; enable_intr(); continue; } if (com->iptr != com->ibuf) { disable_intr(); sioinput(com); enable_intr(); } if (com->state & CS_CHECKMSR) { u_char delta_modem_status; disable_intr(); delta_modem_status = com->last_modem_status ^ com->prev_modem_status; com->prev_modem_status = com->last_modem_status; com_events -= LOTS_OF_EVENTS; com->state &= ~CS_CHECKMSR; enable_intr(); if (delta_modem_status & MSR_DCD) (*linesw[tp->t_line].l_modem) (tp, com->prev_modem_status & MSR_DCD); } if (com->state & CS_ODONE) { disable_intr(); com_events -= LOTS_OF_EVENTS; com->state &= ~CS_ODONE; enable_intr(); if (!(com->state & CS_BUSY) && !(com->extra_state & CSE_BUSYCHECK)) { timeout(siobusycheck, com, hz / 100); com->extra_state |= CSE_BUSYCHECK; } (*linesw[tp->t_line].l_start)(tp); } if (com_events == 0) break; } if (com_events >= LOTS_OF_EVENTS) goto repeat; } static int comparam(tp, t) struct tty *tp; struct termios *t; { u_int cfcr; int cflag; struct com_s *com; int divisor; u_char dlbh; u_char dlbl; Port_t iobase; int s; int unit; /* do historical conversions */ if (t->c_ispeed == 0) t->c_ispeed = t->c_ospeed; /* check requested parameters */ divisor = ttspeedtab(t->c_ospeed, comspeedtab); if (divisor < 0 || (divisor > 0 && t->c_ispeed != t->c_ospeed)) return (EINVAL); /* parameters are OK, convert them to the com struct and the device */ unit = DEV_TO_UNIT(tp->t_dev); com = com_addr(unit); iobase = com->iobase; s = spltty(); if (divisor == 0) (void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */ else (void)commctl(com, TIOCM_DTR, DMBIS); cflag = t->c_cflag; switch (cflag & CSIZE) { case CS5: cfcr = CFCR_5BITS; break; case CS6: cfcr = CFCR_6BITS; break; case CS7: cfcr = CFCR_7BITS; break; default: cfcr = CFCR_8BITS; break; } if (cflag & PARENB) { cfcr |= CFCR_PENAB; if (!(cflag & PARODD)) cfcr |= CFCR_PEVEN; } if (cflag & CSTOPB) cfcr |= CFCR_STOPB; if (com->hasfifo && divisor != 0) { /* * Use a fifo trigger level low enough so that the input * latency from the fifo is less than about 16 msec and * the total latency is less than about 30 msec. These * latencies are reasonable for humans. Serial comms * protocols shouldn't expect anything better since modem * latencies are larger. */ com->fifo_image = t->c_ospeed <= 4800 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_HIGH; #ifdef COM_ESP /* * The Hayes ESP card needs the fifo DMA mode bit set * in compatibility mode. If not, it will interrupt * for each character received. */ if (com->esp) com->fifo_image |= FIFO_DMA_MODE; #endif outb(iobase + com_fifo, com->fifo_image); } /* * 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); /* * Only set the divisor registers if they would change, * since on some 16550 incompatibles (UMC8669F), setting * them while input is arriving them loses sync until * data stops arriving. */ dlbl = divisor & 0xFF; if (inb(iobase + com_dlbl) != dlbl) outb(iobase + com_dlbl, dlbl); dlbh = (u_int) divisor >> 8; if (inb(iobase + com_dlbh) != dlbh) outb(iobase + com_dlbh, dlbh); } outb(iobase + com_cfcr, com->cfcr_image = cfcr); if (!(tp->t_state & TS_TTSTOP)) com->state |= CS_TTGO; if (cflag & CRTS_IFLOW) { if (com->st16650a) { outb(iobase + com_cfcr, 0xbf); outb(iobase + com_fifo, inb(iobase + com_fifo) | 0x40); } 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); if (com->st16650a) { outb(iobase + com_cfcr, 0xbf); outb(iobase + com_fifo, inb(iobase + com_fifo) & ~0x40); } } /* * Set up state to handle output flow control. * XXX - worth handling MDMBUF (DCD) flow control at the lowest level? * Now has 10+ msec latency, while CTS flow has 50- usec latency. */ com->state |= CS_ODEVREADY; com->state &= ~CS_CTS_OFLOW; if (cflag & CCTS_OFLOW) { com->state |= CS_CTS_OFLOW; if (!(com->last_modem_status & MSR_CTS)) com->state &= ~CS_ODEVREADY; if (com->st16650a) { outb(iobase + com_cfcr, 0xbf); outb(iobase + com_fifo, inb(iobase + com_fifo) | 0x80); } } else { if (com->st16650a) { outb(iobase + com_cfcr, 0xbf); outb(iobase + com_fifo, inb(iobase + com_fifo) & ~0x80); } } outb(iobase + com_cfcr, com->cfcr_image); /* XXX shouldn't call functions while intrs are disabled. */ disc_optim(tp, t, com); /* * Recover from fiddling with CS_TTGO. We used to call siointr1() * unconditionally, but that defeated the careful discarding of * stale input in sioopen(). */ if (com->state >= (CS_BUSY | CS_TTGO)) siointr1(com); 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); } static void comstart(tp) struct tty *tp; { struct com_s *com; int s; int unit; unit = DEV_TO_UNIT(tp->t_dev); com = com_addr(unit); s = spltty(); disable_intr(); if (tp->t_state & TS_TTSTOP) com->state &= ~CS_TTGO; else com->state |= CS_TTGO; if (tp->t_state & TS_TBLOCK) { if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW) outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); } else { 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(); if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { ttwwakeup(tp); splx(s); return; } if (tp->t_outq.c_cc != 0) { struct lbq *qp; struct lbq *next; if (!com->obufs[0].l_queued) { com->obufs[0].l_tail = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1, sizeof com->obuf1); com->obufs[0].l_next = NULL; com->obufs[0].l_queued = TRUE; disable_intr(); if (com->state & CS_BUSY) { qp = com->obufq.l_next; while ((next = qp->l_next) != NULL) qp = next; qp->l_next = &com->obufs[0]; } else { com->obufq.l_head = com->obufs[0].l_head; com->obufq.l_tail = com->obufs[0].l_tail; com->obufq.l_next = &com->obufs[0]; com->state |= CS_BUSY; } enable_intr(); } if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) { com->obufs[1].l_tail = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2, sizeof com->obuf2); com->obufs[1].l_next = NULL; com->obufs[1].l_queued = TRUE; disable_intr(); if (com->state & CS_BUSY) { qp = com->obufq.l_next; while ((next = qp->l_next) != NULL) qp = next; qp->l_next = &com->obufs[1]; } else { com->obufq.l_head = com->obufs[1].l_head; com->obufq.l_tail = com->obufs[1].l_tail; com->obufq.l_next = &com->obufs[1]; com->state |= CS_BUSY; } enable_intr(); } tp->t_state |= TS_BUSY; } disable_intr(); if (com->state >= (CS_BUSY | CS_TTGO)) siointr1(com); /* fake interrupt to start output */ enable_intr(); ttwwakeup(tp); splx(s); } static void comstop(tp, rw) struct tty *tp; int rw; { struct com_s *com; com = com_addr(DEV_TO_UNIT(tp->t_dev)); if (com->gone) return; disable_intr(); if (rw & FWRITE) { if (com->hasfifo) #ifdef COM_ESP /* XXX avoid h/w bug. */ if (!com->esp) #endif outb(com->iobase + com_fifo, FIFO_XMT_RST | com->fifo_image); com->obufs[0].l_queued = FALSE; com->obufs[1].l_queued = FALSE; if (com->state & CS_ODONE) com_events -= LOTS_OF_EVENTS; com->state &= ~(CS_ODONE | CS_BUSY); com->tp->t_state &= ~TS_BUSY; } if (rw & FREAD) { if (com->hasfifo) #ifdef COM_ESP /* XXX avoid h/w bug. */ if (!com->esp) #endif outb(com->iobase + com_fifo, FIFO_RCV_RST | com->fifo_image); com_events -= (com->iptr - com->ibuf); com->iptr = com->ibuf; } enable_intr(); comstart(tp); } static int commctl(com, bits, how) struct com_s *com; int bits; int how; { int mcr; int msr; if (how == DMGET) { bits = TIOCM_LE; /* XXX - always enabled while open */ mcr = com->mcr_image; if (mcr & MCR_DTR) bits |= TIOCM_DTR; if (mcr & MCR_RTS) bits |= TIOCM_RTS; msr = com->prev_modem_status; if (msr & MSR_CTS) bits |= TIOCM_CTS; if (msr & MSR_DCD) bits |= TIOCM_CD; if (msr & MSR_DSR) bits |= TIOCM_DSR; /* * XXX - MSR_RI is naturally volatile, and we make MSR_TERI * more volatile by reading the modem status a lot. Perhaps * we should latch both bits until the status is read here. */ if (msr & (MSR_RI | MSR_TERI)) bits |= TIOCM_RI; return (bits); } mcr = 0; if (bits & TIOCM_DTR) mcr |= MCR_DTR; if (bits & TIOCM_RTS) mcr |= MCR_RTS; if (com->gone) return(0); disable_intr(); switch (how) { case DMSET: outb(com->modem_ctl_port, com->mcr_image = mcr | (com->mcr_image & MCR_IENABLE)); break; case DMBIS: outb(com->modem_ctl_port, com->mcr_image |= mcr); break; case DMBIC: outb(com->modem_ctl_port, com->mcr_image &= ~mcr); break; } enable_intr(); return (0); } static void siosettimeout() { struct com_s *com; bool_t someopen; int unit; /* * Set our timeout period to 1 second if no polled devices are open. * Otherwise set it to max(1/200, 1/hz). * Enable timeouts iff some device is open. */ untimeout(comwakeup, (void *)NULL, sio_timeout_handle); sio_timeout = hz; someopen = FALSE; for (unit = 0; unit < sio_numunits; ++unit) { com = com_addr(unit); if (com != NULL && com->tp != NULL && com->tp->t_state & TS_ISOPEN && !com->gone) { someopen = TRUE; if (com->poll || com->poll_output) { sio_timeout = hz > 200 ? hz / 200 : 1; break; } } } if (someopen) { sio_timeouts_until_log = hz / sio_timeout; sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout); } else { /* Flush error messages, if any. */ sio_timeouts_until_log = 1; comwakeup((void *)NULL); untimeout(comwakeup, (void *)NULL, sio_timeout_handle); } } static void comwakeup(chan) void *chan; { struct com_s *com; int unit; sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout); /* * Recover from lost output interrupts. * Poll any lines that don't use interrupts. */ for (unit = 0; unit < sio_numunits; ++unit) { com = com_addr(unit); if (com != NULL && !com->gone && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) { disable_intr(); siointr1(com); enable_intr(); } } /* * Check for and log errors, but not too often. */ if (--sio_timeouts_until_log > 0) return; sio_timeouts_until_log = hz / sio_timeout; for (unit = 0; unit < sio_numunits; ++unit) { int errnum; com = com_addr(unit); if (com == NULL) continue; if (com->gone) continue; for (errnum = 0; errnum < CE_NTYPES; ++errnum) { u_int delta; u_long total; disable_intr(); delta = com->delta_error_counts[errnum]; com->delta_error_counts[errnum] = 0; enable_intr(); if (delta == 0) continue; total = com->error_counts[errnum] += delta; log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n", unit, delta, error_desc[errnum], delta == 1 ? "" : "s", total); } } } static void disc_optim(tp, t, com) struct tty *tp; struct termios *t; struct com_s *com; { if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) && (!(t->c_iflag & PARMRK) || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) && linesw[tp->t_line].l_rint == ttyinput) tp->t_state |= TS_CAN_BYPASS_L_RINT; else tp->t_state &= ~TS_CAN_BYPASS_L_RINT; com->hotchar = linesw[tp->t_line].l_hotchar; } /* * Following are all routines needed for SIO to act as console */ #include struct siocnstate { u_char dlbl; u_char dlbh; u_char ier; u_char cfcr; u_char mcr; }; static speed_t siocngetspeed __P((Port_t, struct speedtab *)); static void siocnclose __P((struct siocnstate *sp, Port_t iobase)); static void siocnopen __P((struct siocnstate *sp, Port_t iobase, int speed)); static void siocntxwait __P((Port_t iobase)); static cn_probe_t siocnprobe; static cn_init_t siocninit; static cn_checkc_t siocncheckc; static cn_getc_t siocngetc; static cn_putc_t siocnputc; #ifdef __i386__ CONS_DRIVER(sio, siocnprobe, siocninit, NULL, siocngetc, siocncheckc, siocnputc); #endif /* To get the GDB related variables */ #if DDB > 0 #include #endif static void siocntxwait(iobase) Port_t iobase; { int timo; /* * Wait for any pending transmission to finish. Required to avoid * the UART lockup bug when the speed is changed, and for normal * transmits. */ timo = 100000; while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY)) != (LSR_TSRE | LSR_TXRDY) && --timo != 0) ; } /* * Read the serial port specified and try to figure out what speed * it's currently running at. We're assuming the serial port has * been initialized and is basicly idle. This routine is only intended * to be run at system startup. * * If the value read from the serial port doesn't make sense, return 0. */ static speed_t siocngetspeed(iobase, table) Port_t iobase; struct speedtab *table; { int code; u_char dlbh; u_char dlbl; u_char cfcr; cfcr = inb(iobase + com_cfcr); outb(iobase + com_cfcr, CFCR_DLAB | cfcr); dlbl = inb(iobase + com_dlbl); dlbh = inb(iobase + com_dlbh); outb(iobase + com_cfcr, cfcr); code = dlbh << 8 | dlbl; for (; table->sp_speed != -1; table++) if (table->sp_code == code) return (table->sp_speed); return 0; /* didn't match anything sane */ } static void siocnopen(sp, iobase, speed) struct siocnstate *sp; Port_t iobase; int speed; { int divisor; u_char dlbh; u_char dlbl; /* * Save all the device control registers except the fifo register * and set our default ones (cs8 -parenb speed=comdefaultrate). * We can't save the fifo register since it is read-only. */ sp->ier = inb(iobase + com_ier); outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */ siocntxwait(iobase); sp->cfcr = inb(iobase + com_cfcr); outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); sp->dlbl = inb(iobase + com_dlbl); sp->dlbh = inb(iobase + com_dlbh); /* * Only set the divisor registers if they would change, since on * some 16550 incompatibles (Startech), setting them clears the * data input register. This also reduces the effects of the * UMC8669F bug. */ divisor = ttspeedtab(speed, comspeedtab); dlbl = divisor & 0xFF; if (sp->dlbl != dlbl) outb(iobase + com_dlbl, dlbl); dlbh = (u_int) divisor >> 8; if (sp->dlbh != dlbh) outb(iobase + com_dlbh, dlbh); outb(iobase + com_cfcr, CFCR_8BITS); sp->mcr = inb(iobase + com_mcr); /* * We don't want interrupts, but must be careful not to "disable" * them by clearing the MCR_IENABLE bit, since that might cause * an interrupt by floating the IRQ line. */ outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS); } static void siocnclose(sp, iobase) struct siocnstate *sp; Port_t iobase; { /* * Restore the device control registers. */ siocntxwait(iobase); outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); if (sp->dlbl != inb(iobase + com_dlbl)) outb(iobase + com_dlbl, sp->dlbl); if (sp->dlbh != inb(iobase + com_dlbh)) outb(iobase + com_dlbh, sp->dlbh); outb(iobase + com_cfcr, sp->cfcr); /* * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them. */ outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS); outb(iobase + com_ier, sp->ier); } static void siocnprobe(cp) struct consdev *cp; { speed_t boot_speed; u_char cfcr; int s, unit; struct siocnstate sp; /* * Find our first enabled console, if any. If it is a high-level * console device, then initialize it and return successfully. * If it is a low-level console device, then initialize it and * return unsuccessfully. It must be initialized in both cases * for early use by console drivers and debuggers. Initializing * the hardware is not necessary in all cases, since the i/o * routines initialize it on the fly, but it is necessary if * input might arrive while the hardware is switched back to an * uninitialized state. We can't handle multiple console devices * yet because our low-level routines don't take a device arg. * We trust the user to set the console flags properly so that we * don't need to probe. */ cp->cn_pri = CN_DEAD; for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */ int flags; int disabled; if (resource_int_value("sio", unit, "disabled", &disabled) == 0) { if (disabled) continue; } if (resource_int_value("sio", unit, "flags", &flags)) continue; if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) { int port; Port_t iobase; if (resource_int_value("sio", unit, "port", &port)) continue; iobase = port; s = spltty(); if (boothowto & RB_SERIAL) { boot_speed = siocngetspeed(iobase, comspeedtab); if (boot_speed) comdefaultrate = boot_speed; } /* * Initialize the divisor latch. We can't rely on * siocnopen() to do this the first time, since it * avoids writing to the latch if the latch appears * to have the correct value. Also, if we didn't * just read the speed from the hardware, then we * need to set the speed in hardware so that * switching it later is null. */ cfcr = inb(iobase + com_cfcr); outb(iobase + com_cfcr, CFCR_DLAB | cfcr); outb(iobase + com_dlbl, COMBRD(comdefaultrate) & 0xff); outb(iobase + com_dlbh, (u_int) COMBRD(comdefaultrate) >> 8); outb(iobase + com_cfcr, cfcr); siocnopen(&sp, iobase, comdefaultrate); splx(s); if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) { cp->cn_dev = makedev(CDEV_MAJOR, unit); cp->cn_pri = COM_FORCECONSOLE(flags) || boothowto & RB_SERIAL ? CN_REMOTE : CN_NORMAL; siocniobase = iobase; siocnunit = unit; } if (COM_DEBUGGER(flags)) { printf("sio%d: gdb debugging port\n", unit); siogdbiobase = iobase; siogdbunit = unit; #if DDB > 0 gdbdev = makedev(CDEV_MAJOR, unit); gdb_getc = siocngetc; gdb_putc = siocnputc; #endif } } } #ifdef __i386__ #if DDB > 0 /* * XXX Ugly Compatability. * If no gdb port has been specified, set it to be the console * as some configuration files don't specify the gdb port. */ if (gdbdev == NODEV && (boothowto & RB_GDB)) { printf("Warning: no GDB port specified. Defaulting to sio%d.\n", siocnunit); printf("Set flag 0x80 on desired GDB port in your\n"); printf("configuration file (currently sio only).\n"); siogdbiobase = siocniobase; siogdbunit = siocnunit; gdbdev = makedev(CDEV_MAJOR, siocnunit); gdb_getc = siocngetc; gdb_putc = siocnputc; } #endif #endif } #ifdef __alpha__ CONS_DRIVER(sio, NULL, NULL, NULL, siocngetc, siocncheckc, siocnputc); int siocnattach(port, speed) int port; int speed; { int s; u_char cfcr; struct siocnstate sp; siocniobase = port; comdefaultrate = speed; sio_consdev.cn_pri = CN_NORMAL; sio_consdev.cn_dev = makedev(CDEV_MAJOR, 0); s = spltty(); /* * Initialize the divisor latch. We can't rely on * siocnopen() to do this the first time, since it * avoids writing to the latch if the latch appears * to have the correct value. Also, if we didn't * just read the speed from the hardware, then we * need to set the speed in hardware so that * switching it later is null. */ cfcr = inb(siocniobase + com_cfcr); outb(siocniobase + com_cfcr, CFCR_DLAB | cfcr); outb(siocniobase + com_dlbl, COMBRD(comdefaultrate) & 0xff); outb(siocniobase + com_dlbh, (u_int) COMBRD(comdefaultrate) >> 8); outb(siocniobase + com_cfcr, cfcr); siocnopen(&sp, siocniobase, comdefaultrate); splx(s); cn_tab = &sio_consdev; return 0; } int siogdbattach(port, speed) int port; int speed; { int s; u_char cfcr; struct siocnstate sp; siogdbiobase = port; gdbdefaultrate = speed; s = spltty(); /* * Initialize the divisor latch. We can't rely on * siocnopen() to do this the first time, since it * avoids writing to the latch if the latch appears * to have the correct value. Also, if we didn't * just read the speed from the hardware, then we * need to set the speed in hardware so that * switching it later is null. */ cfcr = inb(siogdbiobase + com_cfcr); outb(siogdbiobase + com_cfcr, CFCR_DLAB | cfcr); outb(siogdbiobase + com_dlbl, COMBRD(gdbdefaultrate) & 0xff); outb(siogdbiobase + com_dlbh, (u_int) COMBRD(gdbdefaultrate) >> 8); outb(siogdbiobase + com_cfcr, cfcr); siocnopen(&sp, siogdbiobase, gdbdefaultrate); splx(s); return 0; } #endif static void siocninit(cp) struct consdev *cp; { comconsole = DEV_TO_UNIT(cp->cn_dev); } static int siocncheckc(dev) dev_t dev; { int c; Port_t iobase; int s; struct siocnstate sp; if (minor(dev) == siogdbunit) iobase = siogdbiobase; else iobase = siocniobase; s = spltty(); siocnopen(&sp, iobase, comdefaultrate); if (inb(iobase + com_lsr) & LSR_RXRDY) c = inb(iobase + com_data); else c = -1; siocnclose(&sp, iobase); splx(s); return (c); } int siocngetc(dev) dev_t dev; { int c; Port_t iobase; int s; struct siocnstate sp; if (minor(dev) == siogdbunit) iobase = siogdbiobase; else iobase = siocniobase; s = spltty(); siocnopen(&sp, iobase, comdefaultrate); while (!(inb(iobase + com_lsr) & LSR_RXRDY)) ; c = inb(iobase + com_data); siocnclose(&sp, iobase); splx(s); return (c); } void siocnputc(dev, c) dev_t dev; int c; { int s; struct siocnstate sp; Port_t iobase; if (minor(dev) == siogdbunit) iobase = siogdbiobase; else iobase = siocniobase; s = spltty(); siocnopen(&sp, iobase, comdefaultrate); siocntxwait(iobase); outb(iobase + com_data, c); siocnclose(&sp, iobase); splx(s); } #ifdef __alpha__ int siogdbgetc() { int c; Port_t iobase; int s; struct siocnstate sp; iobase = siogdbiobase; s = spltty(); siocnopen(&sp, iobase, gdbdefaultrate); while (!(inb(iobase + com_lsr) & LSR_RXRDY)) ; c = inb(iobase + com_data); siocnclose(&sp, iobase); splx(s); return (c); } void siogdbputc(c) int c; { int s; struct siocnstate sp; s = spltty(); siocnopen(&sp, siogdbiobase, gdbdefaultrate); siocntxwait(siogdbiobase); outb(siogdbiobase + com_data, c); siocnclose(&sp, siogdbiobase); splx(s); } #endif DRIVER_MODULE(sio, isa, sio_isa_driver, sio_devclass, 0, 0); #if NCARD > 0 DRIVER_MODULE(sio, pccard, sio_pccard_driver, sio_devclass, 0, 0); #endif