root/sys/dev/pci/fms.c 
/*      $NetBSD: fms.c,v 1.50 2024/01/08 18:37:24 chs Exp $     */

/*-
 * Copyright (c) 1999, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Witold J. Wnuk.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * Forte Media FM801 Audio Device Driver
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fms.c,v 1.50 2024/01/08 18:37:24 chs Exp $");

#include "mpu.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/device.h>
#include <sys/audioio.h>

#include <sys/bus.h>
#include <sys/cpu.h>

#include <dev/pci/pcidevs.h>
#include <dev/pci/pcivar.h>

#include <dev/audio/audio_if.h>

#include <dev/ic/ac97var.h>
#include <dev/ic/mpuvar.h>

#include <dev/pci/fmsvar.h>


struct fms_dma {
        struct fms_dma *next;
        void *addr;
        size_t size;
        bus_dmamap_t map;
        bus_dma_segment_t seg;
};



static int      fms_match(device_t, cfdata_t, void *);
static void     fms_attach(device_t, device_t, void *);
static int      fms_intr(void *);

static int      fms_query_format(void *, audio_format_query_t *);
static int      fms_set_format(void *, int,
                               const audio_params_t *, const audio_params_t *,
                               audio_filter_reg_t *, audio_filter_reg_t *);
static int      fms_round_blocksize(void *, int, int, const audio_params_t *);
static int      fms_halt_output(void *);
static int      fms_halt_input(void *);
static int      fms_getdev(void *, struct audio_device *);
static int      fms_set_port(void *, mixer_ctrl_t *);
static int      fms_get_port(void *, mixer_ctrl_t *);
static int      fms_query_devinfo(void *, mixer_devinfo_t *);
static void     *fms_malloc(void *, int, size_t);
static void     fms_free(void *, void *, size_t);
static int      fms_get_props(void *);
static int      fms_trigger_output(void *, void *, void *, int,
                                   void (*)(void *), void *,
                                   const audio_params_t *);
static int      fms_trigger_input(void *, void *, void *, int,
                                  void (*)(void *), void *,
                                  const audio_params_t *);
static void     fms_get_locks(void *, kmutex_t **, kmutex_t **);

CFATTACH_DECL_NEW(fms, sizeof (struct fms_softc),
    fms_match, fms_attach, NULL, NULL);

static struct audio_device fms_device = {
        "Forte Media 801",
        "1.0",
        "fms"
};

/*
 * The frequency list in this format is also referred from fms_rate2index().
 * So don't rearrange or delete entries.
 */
static const struct audio_format fms_formats[] = {
        {
                .mode           = AUMODE_PLAY | AUMODE_RECORD,
                .encoding       = AUDIO_ENCODING_SLINEAR_LE,
                .validbits      = 16,
                .precision      = 16,
                .channels       = 2,
                .channel_mask   = AUFMT_STEREO,
                .frequency_type = 11,
                .frequency      = { 5500, 8000, 9600, 11025, 16000, 19200,
                                    22050, 32000, 38400, 44100, 48000},
        },
};
#define FMS_NFORMATS    __arraycount(fms_formats)


static const struct audio_hw_if fms_hw_if = {
        .query_format           = fms_query_format,
        .set_format             = fms_set_format,
        .round_blocksize        = fms_round_blocksize,
        .halt_output            = fms_halt_output,
        .halt_input             = fms_halt_input,
        .getdev                 = fms_getdev,
        .set_port               = fms_set_port,
        .get_port               = fms_get_port,
        .query_devinfo          = fms_query_devinfo,
        .allocm                 = fms_malloc,
        .freem                  = fms_free,
        .get_props              = fms_get_props,
        .trigger_output         = fms_trigger_output,
        .trigger_input          = fms_trigger_input,
        .get_locks              = fms_get_locks,
};

static int      fms_attach_codec(void *, struct ac97_codec_if *);
static int      fms_read_codec(void *, uint8_t, uint16_t *);
static int      fms_write_codec(void *, uint8_t, uint16_t);
static int      fms_reset_codec(void *);
static int      fms_rate2index(u_int);

#define FM_PCM_VOLUME           0x00
#define FM_FM_VOLUME            0x02
#define FM_I2S_VOLUME           0x04
#define FM_RECORD_SOURCE        0x06

#define FM_PLAY_CTL             0x08
#define  FM_PLAY_RATE_MASK              0x0f00
#define  FM_PLAY_BUF1_LAST              0x0001
#define  FM_PLAY_BUF2_LAST              0x0002
#define  FM_PLAY_START                  0x0020
#define  FM_PLAY_PAUSE                  0x0040
#define  FM_PLAY_STOPNOW                0x0080
#define  FM_PLAY_16BIT                  0x4000
#define  FM_PLAY_STEREO                 0x8000

#define FM_PLAY_DMALEN          0x0a
#define FM_PLAY_DMABUF1         0x0c
#define FM_PLAY_DMABUF2         0x10


#define FM_REC_CTL              0x14
#define  FM_REC_RATE_MASK               0x0f00
#define  FM_REC_BUF1_LAST               0x0001
#define  FM_REC_BUF2_LAST               0x0002
#define  FM_REC_START                   0x0020
#define  FM_REC_PAUSE                   0x0040
#define  FM_REC_STOPNOW                 0x0080
#define  FM_REC_16BIT                   0x4000
#define  FM_REC_STEREO                  0x8000


#define FM_REC_DMALEN           0x16
#define FM_REC_DMABUF1          0x18
#define FM_REC_DMABUF2          0x1c

#define FM_CODEC_CTL            0x22
#define FM_VOLUME               0x26
#define  FM_VOLUME_MUTE                 0x8000

#define FM_CODEC_CMD            0x2a
#define  FM_CODEC_CMD_READ              0x0080
#define  FM_CODEC_CMD_VALID             0x0100
#define  FM_CODEC_CMD_BUSY              0x0200

#define FM_CODEC_DATA           0x2c

#define FM_IO_CTL               0x52
#define FM_CARD_CTL             0x54

#define FM_INTMASK              0x56
#define  FM_INTMASK_PLAY                0x0001
#define  FM_INTMASK_REC                 0x0002
#define  FM_INTMASK_VOL                 0x0040
#define  FM_INTMASK_MPU                 0x0080

#define FM_INTSTATUS            0x5a
#define  FM_INTSTATUS_PLAY              0x0100
#define  FM_INTSTATUS_REC               0x0200
#define  FM_INTSTATUS_VOL               0x4000
#define  FM_INTSTATUS_MPU               0x8000


static int
fms_match(device_t parent, cfdata_t match, void *aux)
{
        struct pci_attach_args *pa;

        pa = (struct pci_attach_args *)aux;
        if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_FORTEMEDIA)
                return 0;
        if (PCI_PRODUCT(pa->pa_id) != PCI_PRODUCT_FORTEMEDIA_FM801)
                return 0;

        return 1;
}

static void
fms_attach(device_t parent, device_t self, void *aux)
{
        struct pci_attach_args *pa;
        struct fms_softc *sc;
        struct audio_attach_args aa;
        const char *intrstr;
        pci_chipset_tag_t pc;
        pcitag_t pt;
        pci_intr_handle_t ih;
        uint16_t k1;
        char intrbuf[PCI_INTRSTR_LEN];

        pa = aux;
        sc = device_private(self);
        sc->sc_dev = self;
        intrstr = NULL;
        pc = pa->pa_pc;
        pt = pa->pa_tag;
        aprint_naive(": Audio controller\n");
        aprint_normal(": Forte Media FM-801\n");

        if (pci_mapreg_map(pa, 0x10, PCI_MAPREG_TYPE_IO, 0, &sc->sc_iot,
                           &sc->sc_ioh, &sc->sc_ioaddr, &sc->sc_iosize)) {
                aprint_error_dev(sc->sc_dev, "can't map i/o space\n");
                return;
        }
        if (bus_space_subregion(sc->sc_iot, sc->sc_ioh, 0x30, 2,
                                &sc->sc_mpu_ioh))
                panic("fms_attach: can't get mpu subregion handle");
        if (bus_space_subregion(sc->sc_iot, sc->sc_ioh, 0x68, 4,
                                &sc->sc_opl_ioh))
                panic("fms_attach: can't get opl subregion handle");

        if (pci_intr_map(pa, &ih)) {
                aprint_error_dev(sc->sc_dev, "couldn't map interrupt\n");
                return;
        }
        intrstr = pci_intr_string(pc, ih, intrbuf, sizeof(intrbuf));

        mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
        mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_AUDIO);

        sc->sc_ih = pci_intr_establish_xname(pc, ih, IPL_AUDIO, fms_intr, sc,
            device_xname(self));
        if (sc->sc_ih == NULL) {
                aprint_error_dev(sc->sc_dev, "couldn't establish interrupt");
                if (intrstr != NULL)
                        aprint_error(" at %s", intrstr);
                aprint_error("\n");
                mutex_destroy(&sc->sc_lock);
                mutex_destroy(&sc->sc_intr_lock);
                return;
        }

        sc->sc_dmat = pa->pa_dmat;

        aprint_normal_dev(sc->sc_dev, "interrupting at %s\n", intrstr);

        /* Disable legacy audio (SBPro compatibility) */
        pci_conf_write(pc, pt, 0x40, 0);

        /* Reset codec and AC'97 */
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_CODEC_CTL, 0x0020);
        delay(2);               /* > 1us according to AC'97 documentation */
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_CODEC_CTL, 0x0000);
        delay(1);               /* > 168.2ns according to AC'97 documentation */

        /* Set up volume */
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_PCM_VOLUME, 0x0808);
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_FM_VOLUME, 0x0808);
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_I2S_VOLUME, 0x0808);

        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_RECORD_SOURCE, 0x0000);

        /* Unmask playback, record and mpu interrupts, mask the rest */
        k1 = bus_space_read_2(sc->sc_iot, sc->sc_ioh, FM_INTMASK);
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_INTMASK,
            (k1 & ~(FM_INTMASK_PLAY | FM_INTMASK_REC | FM_INTMASK_MPU)) |
             FM_INTMASK_VOL);
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_INTSTATUS,
            FM_INTSTATUS_PLAY | FM_INTSTATUS_REC | FM_INTSTATUS_MPU |
            FM_INTSTATUS_VOL);

        sc->host_if.arg = sc;
        sc->host_if.attach = fms_attach_codec;
        sc->host_if.read = fms_read_codec;
        sc->host_if.write = fms_write_codec;
        sc->host_if.reset = fms_reset_codec;

        if (ac97_attach(&sc->host_if, self, &sc->sc_lock) != 0) {
                mutex_destroy(&sc->sc_intr_lock);
                mutex_destroy(&sc->sc_lock);
                return;
        }

        audio_attach_mi(&fms_hw_if, sc, sc->sc_dev);

        aa.type = AUDIODEV_TYPE_OPL;
        aa.hwif = NULL;
        aa.hdl = NULL;
        config_found(sc->sc_dev, &aa, audioprint, CFARGS(.iattr = "fms"));

        aa.type = AUDIODEV_TYPE_MPU;
        aa.hwif = NULL;
        aa.hdl = NULL;
        sc->sc_mpu_dev = config_found(sc->sc_dev, &aa, audioprint,
            CFARGS(.iattr = "fms"));
}

/*
 * Each AC-link frame takes 20.8us, data should be ready in next frame,
 * we allow more than two.
 */
#define TIMO 50
static int
fms_read_codec(void *addr, uint8_t reg, uint16_t *val)
{
        struct fms_softc *sc;
        int i;

        sc = addr;
        /* Poll until codec is ready */
        for (i = 0; i < TIMO && bus_space_read_2(sc->sc_iot, sc->sc_ioh,
                 FM_CODEC_CMD) & FM_CODEC_CMD_BUSY; i++)
                delay(1);
        if (i >= TIMO) {
                printf("fms: codec busy\n");
                return 1;
        }

        /* Write register index, read access */
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_CODEC_CMD,
                          reg | FM_CODEC_CMD_READ);

        /* Poll until we have valid data */
        for (i = 0; i < TIMO && !(bus_space_read_2(sc->sc_iot, sc->sc_ioh,
                 FM_CODEC_CMD) & FM_CODEC_CMD_VALID); i++)
                delay(1);
        if (i >= TIMO) {
                printf("fms: no data from codec\n");
                return 1;
        }

        /* Read data */
        *val = bus_space_read_2(sc->sc_iot, sc->sc_ioh, FM_CODEC_DATA);
        return 0;
}

static int
fms_write_codec(void *addr, uint8_t reg, uint16_t val)
{
        struct fms_softc *sc = addr;
        int i;

        /* Poll until codec is ready */
        for (i = 0; i < TIMO && bus_space_read_2(sc->sc_iot, sc->sc_ioh,
                 FM_CODEC_CMD) & FM_CODEC_CMD_BUSY; i++)
                delay(1);
        if (i >= TIMO) {
                printf("fms: codec busy\n");
                return 1;
        }

        /* Write data */
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_CODEC_DATA, val);
        /* Write index register, write access */
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_CODEC_CMD, reg);
        return 0;
}
#undef TIMO

static int
fms_attach_codec(void *addr, struct ac97_codec_if *cif)
{
        struct fms_softc *sc;

        sc = addr;
        sc->codec_if = cif;
        return 0;
}

/* Cold Reset */
static int
fms_reset_codec(void *addr)
{
        struct fms_softc *sc;

        sc = addr;
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_CODEC_CTL, 0x0020);
        delay(2);
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_CODEC_CTL, 0x0000);
        delay(1);
        return 0;
}

static int
fms_intr(void *arg)
{
        struct fms_softc *sc = arg;
#if NMPU > 0
        struct mpu_softc *sc_mpu = device_private(sc->sc_mpu_dev);
#endif
        uint16_t istat;

        mutex_spin_enter(&sc->sc_intr_lock);

        istat = bus_space_read_2(sc->sc_iot, sc->sc_ioh, FM_INTSTATUS);

        if (istat & FM_INTSTATUS_PLAY) {
                if ((sc->sc_play_nextblk += sc->sc_play_blksize) >=
                     sc->sc_play_end)
                        sc->sc_play_nextblk = sc->sc_play_start;

                bus_space_write_4(sc->sc_iot, sc->sc_ioh,
                    sc->sc_play_flip++ & 1 ?
                    FM_PLAY_DMABUF2 : FM_PLAY_DMABUF1, sc->sc_play_nextblk);

                if (sc->sc_pintr)
                        sc->sc_pintr(sc->sc_parg);
                else
                        printf("unexpected play intr\n");
        }

        if (istat & FM_INTSTATUS_REC) {
                if ((sc->sc_rec_nextblk += sc->sc_rec_blksize) >=
                     sc->sc_rec_end)
                        sc->sc_rec_nextblk = sc->sc_rec_start;

                bus_space_write_4(sc->sc_iot, sc->sc_ioh,
                    sc->sc_rec_flip++ & 1 ?
                    FM_REC_DMABUF2 : FM_REC_DMABUF1, sc->sc_rec_nextblk);

                if (sc->sc_rintr)
                        sc->sc_rintr(sc->sc_rarg);
                else
                        printf("unexpected rec intr\n");
        }

#if NMPU > 0
        if (istat & FM_INTSTATUS_MPU)
                mpu_intr(sc_mpu);
#endif

        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_INTSTATUS,
                          istat & (FM_INTSTATUS_PLAY | FM_INTSTATUS_REC));

        mutex_spin_exit(&sc->sc_intr_lock);

        return 1;
}

static int
fms_query_format(void *addr, audio_format_query_t *afp)
{

        return audio_query_format(fms_formats, FMS_NFORMATS, afp);
}

/* Return index number of sample_rate */
static int
fms_rate2index(u_int sample_rate)
{
        int i;

        for (i = 0; i < fms_formats[0].frequency_type; i++) {
                if (sample_rate == fms_formats[0].frequency[i])
                        return i;
        }

        /* NOTREACHED */
        panic("fms_format.frequency mismatch?\n");
}

static int
fms_set_format(void *addr, int setmode,
    const audio_params_t *play, const audio_params_t *rec,
    audio_filter_reg_t *pfil, audio_filter_reg_t *rfil)
{
        struct fms_softc *sc;

        sc = addr;
        if (setmode & AUMODE_PLAY) {
                sc->sc_play_reg = fms_rate2index(play->sample_rate) << 8;
                sc->sc_play_reg |= FM_PLAY_STEREO;
                sc->sc_play_reg |= FM_PLAY_16BIT;
        }

        if (setmode & AUMODE_RECORD) {
                sc->sc_rec_reg = fms_rate2index(rec->sample_rate) << 8;
                sc->sc_rec_reg |= FM_REC_STEREO;
                sc->sc_rec_reg |= FM_REC_16BIT;
        }

        return 0;
}

static int
fms_round_blocksize(void *addr, int blk, int mode,
    const audio_params_t *param)
{

        return blk & ~0xf;
}

static int
fms_halt_output(void *addr)
{
        struct fms_softc *sc;
        uint16_t k1;

        sc = addr;
        k1 = bus_space_read_2(sc->sc_iot, sc->sc_ioh, FM_PLAY_CTL);
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_PLAY_CTL,
                          (k1 & ~(FM_PLAY_STOPNOW | FM_PLAY_START)) |
                          FM_PLAY_BUF1_LAST | FM_PLAY_BUF2_LAST);

        return 0;
}

static int
fms_halt_input(void *addr)
{
        struct fms_softc *sc;
        uint16_t k1;

        sc = addr;
        k1 = bus_space_read_2(sc->sc_iot, sc->sc_ioh, FM_REC_CTL);
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_REC_CTL,
                          (k1 & ~(FM_REC_STOPNOW | FM_REC_START)) |
                          FM_REC_BUF1_LAST | FM_REC_BUF2_LAST);

        return 0;
}

static int
fms_getdev(void *addr, struct audio_device *retp)
{

        *retp = fms_device;
        return 0;
}

static int
fms_set_port(void *addr, mixer_ctrl_t *cp)
{
        struct fms_softc *sc;

        sc = addr;
        return sc->codec_if->vtbl->mixer_set_port(sc->codec_if, cp);
}

static int
fms_get_port(void *addr, mixer_ctrl_t *cp)
{
        struct fms_softc *sc;

        sc = addr;
        return sc->codec_if->vtbl->mixer_get_port(sc->codec_if, cp);
}

static void *
fms_malloc(void *addr, int direction, size_t size)
{
        struct fms_softc *sc;
        struct fms_dma *p;
        int error;
        int rseg;

        sc = addr;
        p = kmem_alloc(sizeof(*p), KM_SLEEP);
        p->size = size;

        if ((error = bus_dmamem_alloc(sc->sc_dmat, size, PAGE_SIZE, 0, &p->seg,
                                      1, &rseg, BUS_DMA_WAITOK)) != 0) {
                aprint_error_dev(sc->sc_dev, "unable to allocate DMA, error = %d\n", error);
                goto fail_alloc;
        }

        if ((error = bus_dmamem_map(sc->sc_dmat, &p->seg, rseg, size, &p->addr,
                                    BUS_DMA_WAITOK | BUS_DMA_COHERENT)) != 0) {
                aprint_error_dev(sc->sc_dev, "unable to map DMA, error = %d\n",
                       error);
                goto fail_map;
        }

        if ((error = bus_dmamap_create(sc->sc_dmat, size, 1, size, 0,
                                       BUS_DMA_WAITOK, &p->map)) != 0) {
                aprint_error_dev(sc->sc_dev, "unable to create DMA map, error = %d\n",
                       error);
                goto fail_create;
        }

        if ((error = bus_dmamap_load(sc->sc_dmat, p->map, p->addr, size, NULL,
                                     BUS_DMA_WAITOK)) != 0) {
                aprint_error_dev(sc->sc_dev, "unable to load DMA map, error = %d\n",
                       error);
                goto fail_load;
        }

        p->next = sc->sc_dmas;
        sc->sc_dmas = p;

        return p->addr;


fail_load:
        bus_dmamap_destroy(sc->sc_dmat, p->map);
fail_create:
        bus_dmamem_unmap(sc->sc_dmat, p->addr, size);
fail_map:
        bus_dmamem_free(sc->sc_dmat, &p->seg, 1);
fail_alloc:
        kmem_free(p, sizeof(*p));
        return NULL;
}

static void
fms_free(void *addr, void *ptr, size_t size)
{
        struct fms_softc *sc;
        struct fms_dma **pp, *p;

        sc = addr;
        for (pp = &(sc->sc_dmas); (p = *pp) != NULL; pp = &p->next)
                if (p->addr == ptr) {
                        bus_dmamap_unload(sc->sc_dmat, p->map);
                        bus_dmamap_destroy(sc->sc_dmat, p->map);
                        bus_dmamem_unmap(sc->sc_dmat, p->addr, p->size);
                        bus_dmamem_free(sc->sc_dmat, &p->seg, 1);

                        *pp = p->next;
                        kmem_free(p, sizeof(*p));
                        return;
                }

        panic("fms_free: trying to free unallocated memory");
}

static int
fms_get_props(void *addr)
{

        return AUDIO_PROP_PLAYBACK | AUDIO_PROP_CAPTURE |
            AUDIO_PROP_INDEPENDENT | AUDIO_PROP_FULLDUPLEX;
}

static int
fms_query_devinfo(void *addr, mixer_devinfo_t *dip)
{
        struct fms_softc *sc;

        sc = addr;
        return sc->codec_if->vtbl->query_devinfo(sc->codec_if, dip);
}

static int
fms_trigger_output(void *addr, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, const audio_params_t *param)
{
        struct fms_softc *sc;
        struct fms_dma *p;

        sc = addr;
        sc->sc_pintr = intr;
        sc->sc_parg = arg;

        for (p = sc->sc_dmas; p && p->addr != start; p = p->next)
                continue;

        if (p == NULL)
                panic("fms_trigger_output: request with bad start "
                      "address (%p)", start);

        sc->sc_play_start = p->map->dm_segs[0].ds_addr;
        sc->sc_play_end = sc->sc_play_start + ((char *)end - (char *)start);
        sc->sc_play_blksize = blksize;
        sc->sc_play_nextblk = sc->sc_play_start + sc->sc_play_blksize;
        sc->sc_play_flip = 0;
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_PLAY_DMALEN, blksize - 1);
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, FM_PLAY_DMABUF1,
                          sc->sc_play_start);
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, FM_PLAY_DMABUF2,
                          sc->sc_play_nextblk);
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_PLAY_CTL,
                          FM_PLAY_START | FM_PLAY_STOPNOW | sc->sc_play_reg);
        return 0;
}


static int
fms_trigger_input(void *addr, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, const audio_params_t *param)
{
        struct fms_softc *sc;
        struct fms_dma *p;

        sc = addr;
        sc->sc_rintr = intr;
        sc->sc_rarg = arg;

        for (p = sc->sc_dmas; p && p->addr != start; p = p->next)
                continue;

        if (p == NULL)
                panic("fms_trigger_input: request with bad start "
                      "address (%p)", start);

        sc->sc_rec_start = p->map->dm_segs[0].ds_addr;
        sc->sc_rec_end = sc->sc_rec_start + ((char *)end - (char *)start);
        sc->sc_rec_blksize = blksize;
        sc->sc_rec_nextblk = sc->sc_rec_start + sc->sc_rec_blksize;
        sc->sc_rec_flip = 0;
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_REC_DMALEN, blksize - 1);
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, FM_REC_DMABUF1,
                          sc->sc_rec_start);
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, FM_REC_DMABUF2,
                          sc->sc_rec_nextblk);
        bus_space_write_2(sc->sc_iot, sc->sc_ioh, FM_REC_CTL,
                          FM_REC_START | FM_REC_STOPNOW | sc->sc_rec_reg);
        return 0;
}

static void
fms_get_locks(void *addr, kmutex_t **intr, kmutex_t **thread)
{
        struct fms_softc *sc;

        sc = addr;
        *intr = &sc->sc_intr_lock;
        *thread = &sc->sc_lock;
}