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Annotation of sys/arch/sparc/dev/com_obio.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: com_obio.c,v 1.1 2005/07/17 12:22:42 miod Exp $       */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2005, Miodrag Vallat.
        !             5:  *
        !             6:  * Redistribution and use in source and binary forms, with or without
        !             7:  * modification, are permitted provided that the following conditions
        !             8:  * are met:
        !             9:  * 1. Redistributions of source code must retain the above copyright
        !            10:  *    notice, this list of conditions and the following disclaimer.
        !            11:  * 2. Redistributions in binary form must reproduce the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer in the
        !            13:  *    documentation and/or other materials provided with the distribution.
        !            14:  *
        !            15:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
        !            18:  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
        !            19:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            20:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            21:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            22:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
        !            23:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
        !            24:  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            25:  * POSSIBILITY OF SUCH DAMAGE.
        !            26:  */
        !            27:
        !            28: /*
        !            29:  * Driver for the built-in modem on Tadpole SPARCbooks, which provides a
        !            30:  * 16C450-compatible interface. Later models apparently are 16550A-compatible
        !            31:  * (i.e. with a 16 byte FIFO).
        !            32:  */
        !            33:
        !            34: #include <sys/types.h>
        !            35: #include <sys/param.h>
        !            36: #include <sys/systm.h>
        !            37: #include <sys/device.h>
        !            38: #include <sys/tty.h>
        !            39:
        !            40: #include <machine/bus.h>
        !            41: #include <sparc/sparc/auxioreg.h>
        !            42:
        !            43: #include <dev/ic/comreg.h>
        !            44: #include <dev/ic/comvar.h>
        !            45:
        !            46: int    com_obio_match(struct device *, void *, void *);
        !            47: void   com_obio_attach(struct device *, struct device *, void *);
        !            48:
        !            49: struct com_obio_softc {
        !            50:        struct com_softc        sc_com;
        !            51:        struct intrhand         sc_ih;
        !            52:        struct rom_reg          sc_reg;
        !            53:        int                     sc_pwr;
        !            54: };
        !            55:
        !            56: struct cfattach com_obio_ca = {
        !            57:        sizeof(struct com_obio_softc), com_obio_match, com_obio_attach
        !            58: };
        !            59:
        !            60: void   com_obio_disable(struct com_softc *);
        !            61: int    com_obio_enable(struct com_softc *);
        !            62:
        !            63: int
        !            64: com_obio_match(struct device *parent, void *match, void *aux)
        !            65: {
        !            66:        struct confargs *ca = aux;
        !            67:
        !            68:        return (strcmp("modem", ca->ca_ra.ra_name) == 0);
        !            69: }
        !            70:
        !            71: void
        !            72: com_obio_attach(struct device *parent, struct device *self, void *aux)
        !            73: {
        !            74:        struct confargs *ca = aux;
        !            75:        struct com_softc *sc = (void *)self;
        !            76:        struct com_obio_softc *osc = (void *)sc;
        !            77:
        !            78:        /* build a bus tag */
        !            79:        osc->sc_reg = ca->ca_ra.ra_reg[0];
        !            80:
        !            81: #if 0  /* not necessary as we don't compile com console support */
        !            82:        sc->sc_iobase = -1;
        !            83: #endif
        !            84:        sc->sc_iot = &osc->sc_reg;
        !            85:
        !            86:        if (ca->ca_ra.ra_nreg == 0 || bus_space_map(sc->sc_iot, 0,
        !            87:            ca->ca_ra.ra_len, 0, &sc->sc_ioh) != 0) {
        !            88:                printf(": can't map modem registers\n");
        !            89:                return;
        !            90:        }
        !            91:
        !            92:        osc->sc_ih.ih_fun = comintr;
        !            93:        osc->sc_ih.ih_arg = sc;
        !            94:        intr_establish(ca->ca_ra.ra_intr[0].int_pri, &osc->sc_ih, -1,
        !            95:            self->dv_xname);
        !            96:        printf(" pri %d", ca->ca_ra.ra_intr[0].int_pri);
        !            97:
        !            98:        sc->disable = com_obio_disable;
        !            99:        sc->enable = com_obio_enable;
        !           100:        osc->sc_pwr = getpropint(ca->ca_ra.ra_node, "pwr-on-auxio", 0);
        !           101:        com_obio_enable(sc);
        !           102:        sc->enabled = 1;
        !           103:
        !           104:        sc->sc_frequency = COM_FREQ;
        !           105:        com_attach_subr(sc);
        !           106: }
        !           107:
        !           108: void
        !           109: com_obio_disable(struct com_softc *sc)
        !           110: {
        !           111:        struct com_obio_softc *osc = (void *)sc;
        !           112:
        !           113:        if (osc->sc_pwr) {
        !           114:                sb_auxregbisc(0, 0, AUXIO_MODEM | AUXIO_MODEM_RESET);
        !           115:        }
        !           116: }
        !           117:
        !           118: int
        !           119: com_obio_enable(struct com_softc *sc)
        !           120: {
        !           121:        struct com_obio_softc *osc = (void *)sc;
        !           122:
        !           123:        if (osc->sc_pwr) {
        !           124:                /* enable and reset modem for 20 usec */
        !           125:                sb_auxregbisc(0, AUXIO_MODEM, AUXIO_MODEM_RESET);
        !           126:                delay(20);
        !           127:                /* end reset (active low) */
        !           128:                sb_auxregbisc(0, AUXIO_MODEM_RESET, 0);
        !           129:                /* give the device some time to settle */
        !           130:                delay(100);
        !           131:        }
        !           132:        return (0);
        !           133: }