/*      $NetBSD: sv.c,v 1.63 2024/02/09 22:08:36 andvar Exp $ */
/*      $OpenBSD: sv.c,v 1.2 1998/07/13 01:50:15 csapuntz Exp $ */

/*
 * Copyright (c) 1999, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * 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.
 */

/*
 * Copyright (c) 1998 Constantine Paul Sapuntzakis
 * All rights reserved
 *
 * Author: Constantine Paul Sapuntzakis (csapuntz@cvs.openbsd.org)
 *
 * 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. The author's name or those of the contributors may be used to
 *    endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) 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.
 */

/*
 * S3 SonicVibes driver
 *   Heavily based on the eap driver by Lennart Augustsson
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sv.c,v 1.63 2024/02/09 22:08:36 andvar Exp $");

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

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

#include <sys/audioio.h>
#include <dev/audio/audio_if.h>

#include <dev/ic/i8237reg.h>
#include <dev/pci/svreg.h>
#include <dev/pci/svvar.h>

#include <sys/bus.h>

/* XXX
 * The SonicVibes DMA is broken and only works on 24-bit addresses.
 * As long as bus_dmamem_alloc_range() is missing we use the ISA
 * DMA tag on i386.
 */
#if defined(amd64) || defined(i386)
#include <dev/isa/isavar.h>
#endif

#ifdef AUDIO_DEBUG
#define DPRINTF(x)      if (svdebug) printf x
#define DPRINTFN(n,x)   if (svdebug>(n)) printf x
int     svdebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

static int      sv_match(device_t, cfdata_t, void *);
static void     sv_attach(device_t, device_t, void *);
static int      sv_intr(void *);

struct sv_dma {
        bus_dmamap_t map;
        void *addr;
        bus_dma_segment_t segs[1];
        int nsegs;
        size_t size;
        struct sv_dma *next;
};
#define DMAADDR(p) ((p)->map->dm_segs[0].ds_addr)
#define KERNADDR(p) ((void *)((p)->addr))

CFATTACH_DECL_NEW(sv, sizeof(struct sv_softc),
    sv_match, sv_attach, NULL, NULL);

static struct audio_device sv_device = {
        "S3 SonicVibes",
        "",
        "sv"
};

#define ARRAY_SIZE(foo)  ((sizeof(foo)) / sizeof(foo[0]))

static int      sv_allocmem(struct sv_softc *, size_t, size_t, int,
                            struct sv_dma *);
static int      sv_freemem(struct sv_softc *, struct sv_dma *);

static void     sv_init_mixer(struct sv_softc *);

static int      sv_open(void *, int);
static int      sv_query_format(void *, audio_format_query_t *);
static int      sv_set_format(void *, int,
                              const audio_params_t *, const audio_params_t *,
                              audio_filter_reg_t *, audio_filter_reg_t *);
static int      sv_round_blocksize(void *, int, int, const audio_params_t *);
static int      sv_trigger_output(void *, void *, void *, int, void (*)(void *),
                                  void *, const audio_params_t *);
static int      sv_trigger_input(void *, void *, void *, int, void (*)(void *),
                                 void *, const audio_params_t *);
static int      sv_halt_output(void *);
static int      sv_halt_input(void *);
static int      sv_getdev(void *, struct audio_device *);
static int      sv_mixer_set_port(void *, mixer_ctrl_t *);
static int      sv_mixer_get_port(void *, mixer_ctrl_t *);
static int      sv_query_devinfo(void *, mixer_devinfo_t *);
static void *   sv_malloc(void *, int, size_t);
static void     sv_free(void *, void *, size_t);
static int      sv_get_props(void *);
static void     sv_get_locks(void *, kmutex_t **, kmutex_t **);

#ifdef AUDIO_DEBUG
void    sv_dumpregs(struct sv_softc *sc);
#endif

static const struct audio_hw_if sv_hw_if = {
        .open                   = sv_open,
        .query_format           = sv_query_format,
        .set_format             = sv_set_format,
        .round_blocksize        = sv_round_blocksize,
        .halt_output            = sv_halt_output,
        .halt_input             = sv_halt_input,
        .getdev                 = sv_getdev,
        .set_port               = sv_mixer_set_port,
        .get_port               = sv_mixer_get_port,
        .query_devinfo          = sv_query_devinfo,
        .allocm                 = sv_malloc,
        .freem                  = sv_free,
        .get_props              = sv_get_props,
        .trigger_output         = sv_trigger_output,
        .trigger_input          = sv_trigger_input,
        .get_locks              = sv_get_locks,
};

static const struct audio_format sv_formats[] = {
        {
                .mode           = AUMODE_PLAY | AUMODE_RECORD,
                .encoding       = AUDIO_ENCODING_SLINEAR_LE,
                .validbits      = 16,
                .precision      = 16,
                .channels       = 2,
                .channel_mask   = AUFMT_STEREO,
                .frequency_type = 0,
                .frequency      = { 2000, 48000 },
        },
};
#define SV_NFORMATS     __arraycount(sv_formats)


static void
sv_write(struct sv_softc *sc, uint8_t reg, uint8_t val)
{

        DPRINTFN(8,("sv_write(0x%x, 0x%x)\n", reg, val));
        bus_space_write_1(sc->sc_iot, sc->sc_ioh, reg, val);
}

static uint8_t
sv_read(struct sv_softc *sc, uint8_t reg)
{
        uint8_t val;

        val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, reg);
        DPRINTFN(8,("sv_read(0x%x) = 0x%x\n", reg, val));
        return val;
}

static uint8_t
sv_read_indirect(struct sv_softc *sc, uint8_t reg)
{
        uint8_t val;

        sv_write(sc, SV_CODEC_IADDR, reg & SV_IADDR_MASK);
        val = sv_read(sc, SV_CODEC_IDATA);
        return val;
}

static void
sv_write_indirect(struct sv_softc *sc, uint8_t reg, uint8_t val)
{
        uint8_t iaddr;

        iaddr = reg & SV_IADDR_MASK;
        if (reg == SV_DMA_DATA_FORMAT)
                iaddr |= SV_IADDR_MCE;

        sv_write(sc, SV_CODEC_IADDR, iaddr);
        sv_write(sc, SV_CODEC_IDATA, val);
}

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

        pa = aux;
        if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_S3 &&
            PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_S3_SONICVIBES)
                return 1;

        return 0;
}

static pcireg_t pci_io_alloc_low, pci_io_alloc_high;

static int
pci_alloc_io(pci_chipset_tag_t pc, pcitag_t pt, int pcioffs,
    bus_space_tag_t iot, bus_size_t size, bus_size_t align,
    bus_size_t bound, int flags, bus_space_handle_t *ioh)
{
        bus_addr_t addr;
        int error;

        error = bus_space_alloc(iot, pci_io_alloc_low, pci_io_alloc_high,
                                size, align, bound, flags, &addr, ioh);
        if (error)
                return error;

        pci_conf_write(pc, pt, pcioffs, addr);
        return 0;
}

/*
 * Allocate IO addresses when all other configuration is done.
 */
static void
sv_defer(device_t self)
{
        struct sv_softc *sc;
        pci_chipset_tag_t pc;
        pcitag_t pt;
        pcireg_t dmaio;

        sc = device_private(self);
        pc = sc->sc_pa.pa_pc;
        pt = sc->sc_pa.pa_tag;
        DPRINTF(("sv_defer: %p\n", sc));

        /* XXX
         * Get a reasonable default for the I/O range.
         * Assume the range around SB_PORTBASE is valid on this PCI bus.
         */
        pci_io_alloc_low = pci_conf_read(pc, pt, SV_SB_PORTBASE_SLOT);
        pci_io_alloc_high = pci_io_alloc_low + 0x1000;

        if (pci_alloc_io(pc, pt, SV_DMAA_CONFIG_OFF,
                          sc->sc_iot, SV_DMAA_SIZE, SV_DMAA_ALIGN, 0,
                          0, &sc->sc_dmaa_ioh)) {
                printf("sv_attach: cannot allocate DMA A range\n");
                return;
        }
        dmaio = pci_conf_read(pc, pt, SV_DMAA_CONFIG_OFF);
        DPRINTF(("sv_attach: addr a dmaio=0x%lx\n", (u_long)dmaio));
        pci_conf_write(pc, pt, SV_DMAA_CONFIG_OFF,
                       dmaio | SV_DMA_CHANNEL_ENABLE | SV_DMAA_EXTENDED_ADDR);

        if (pci_alloc_io(pc, pt, SV_DMAC_CONFIG_OFF,
                          sc->sc_iot, SV_DMAC_SIZE, SV_DMAC_ALIGN, 0,
                          0, &sc->sc_dmac_ioh)) {
                printf("sv_attach: cannot allocate DMA C range\n");
                return;
        }
        dmaio = pci_conf_read(pc, pt, SV_DMAC_CONFIG_OFF);
        DPRINTF(("sv_attach: addr c dmaio=0x%lx\n", (u_long)dmaio));
        pci_conf_write(pc, pt, SV_DMAC_CONFIG_OFF,
                       dmaio | SV_DMA_CHANNEL_ENABLE);

        sc->sc_dmaset = 1;
}

static void
sv_attach(device_t parent, device_t self, void *aux)
{
        struct sv_softc *sc;
        struct pci_attach_args *pa;
        pci_chipset_tag_t pc;
        pcitag_t pt;
        pci_intr_handle_t ih;
        pcireg_t csr;
        char const *intrstr;
        uint8_t reg;
        struct audio_attach_args arg;
        char intrbuf[PCI_INTRSTR_LEN];

        sc = device_private(self);
        pa = aux;
        pc = pa->pa_pc;
        pt = pa->pa_tag;
        aprint_naive("\n");
        aprint_normal("\n");

        /* Map I/O registers */
        if (pci_mapreg_map(pa, SV_ENHANCED_PORTBASE_SLOT,
                           PCI_MAPREG_TYPE_IO, 0,
                           &sc->sc_iot, &sc->sc_ioh, NULL, NULL)) {
                aprint_error_dev(self, "can't map enhanced i/o space\n");
                return;
        }
        if (pci_mapreg_map(pa, SV_FM_PORTBASE_SLOT,
                           PCI_MAPREG_TYPE_IO, 0,
                           &sc->sc_opliot, &sc->sc_oplioh, NULL, NULL)) {
                aprint_error_dev(self, "can't map FM i/o space\n");
                return;
        }
        if (pci_mapreg_map(pa, SV_MIDI_PORTBASE_SLOT,
                           PCI_MAPREG_TYPE_IO, 0,
                           &sc->sc_midiiot, &sc->sc_midiioh, NULL, NULL)) {
                aprint_error_dev(self, "can't map MIDI i/o space\n");
                return;
        }
        DPRINTF(("sv: IO ports: enhanced=0x%x, OPL=0x%x, MIDI=0x%x\n",
                 (int)sc->sc_ioh, (int)sc->sc_oplioh, (int)sc->sc_midiioh));

#if defined(alpha)
        /* XXX Force allocation through the SGMAP. */
        sc->sc_dmatag = alphabus_dma_get_tag(pa->pa_dmat, ALPHA_BUS_ISA);
#elif defined(amd64) || defined(i386)
/* XXX
 * The SonicVibes DMA is broken and only works on 24-bit addresses.
 * As long as bus_dmamem_alloc_range() is missing we use the ISA
 * DMA tag on i386.
 */
        sc->sc_dmatag = &isa_bus_dma_tag;
#else
        sc->sc_dmatag = pa->pa_dmat;
#endif

        pci_conf_write(pc, pt, SV_DMAA_CONFIG_OFF, SV_DMAA_EXTENDED_ADDR);
        pci_conf_write(pc, pt, SV_DMAC_CONFIG_OFF, 0);

        /* Enable the device. */
        csr = pci_conf_read(pc, pt, PCI_COMMAND_STATUS_REG);
        pci_conf_write(pc, pt, PCI_COMMAND_STATUS_REG,
                       csr | PCI_COMMAND_MASTER_ENABLE);

        sv_write_indirect(sc, SV_ANALOG_POWER_DOWN_CONTROL, 0);
        sv_write_indirect(sc, SV_DIGITAL_POWER_DOWN_CONTROL, 0);

        /* initialize codec registers */
        reg = sv_read(sc, SV_CODEC_CONTROL);
        reg |= SV_CTL_RESET;
        sv_write(sc, SV_CODEC_CONTROL, reg);
        delay(50);

        reg = sv_read(sc, SV_CODEC_CONTROL);
        reg &= ~SV_CTL_RESET;
        reg |= SV_CTL_INTA | SV_CTL_ENHANCED;

        /* This write clears the reset */
        sv_write(sc, SV_CODEC_CONTROL, reg);
        delay(50);

        /* This write actually shoves the new values in */
        sv_write(sc, SV_CODEC_CONTROL, reg);

        DPRINTF(("sv_attach: control=0x%x\n", sv_read(sc, SV_CODEC_CONTROL)));

        /* Map and establish the interrupt. */
        if (pci_intr_map(pa, &ih)) {
                aprint_error_dev(self, "couldn't map interrupt\n");
                return;
        }

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

        intrstr = pci_intr_string(pc, ih, intrbuf, sizeof(intrbuf));
        sc->sc_ih = pci_intr_establish_xname(pc, ih, IPL_AUDIO, sv_intr, sc,
            device_xname(self));
        if (sc->sc_ih == NULL) {
                aprint_error_dev(self, "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;
        }
        aprint_normal_dev(self, "interrupting at %s\n", intrstr);
        aprint_normal_dev(self, "rev %d",
            sv_read_indirect(sc, SV_REVISION_LEVEL));
        if (sv_read(sc, SV_CODEC_CONTROL) & SV_CTL_MD1)
                aprint_normal(", reverb SRAM present");
        if (!(sv_read_indirect(sc, SV_WAVETABLE_SOURCE_SELECT) & SV_WSS_WT0))
                aprint_normal(", wavetable ROM present");
        aprint_normal("\n");

        /* Enable DMA interrupts */
        reg = sv_read(sc, SV_CODEC_INTMASK);
        reg &= ~(SV_INTMASK_DMAA | SV_INTMASK_DMAC);
        reg |= SV_INTMASK_UD | SV_INTMASK_SINT | SV_INTMASK_MIDI;
        sv_write(sc, SV_CODEC_INTMASK, reg);
        sv_read(sc, SV_CODEC_STATUS);

        sv_init_mixer(sc);

        audio_attach_mi(&sv_hw_if, sc, self);

        arg.type = AUDIODEV_TYPE_OPL;
        arg.hwif = 0;
        arg.hdl = 0;
        (void)config_found(self, &arg, audioprint, CFARGS(.iattr = "sv"));

        sc->sc_pa = *pa;        /* for deferred setup */
        config_defer(self, sv_defer);
}

#ifdef AUDIO_DEBUG
void
sv_dumpregs(struct sv_softc *sc)
{
        int idx;

#if 0
        for (idx = 0; idx < 0x50; idx += 4)
                printf ("%02x = %x\n", idx,
                        pci_conf_read(pa->pa_pc, pa->pa_tag, idx));
#endif

        for (idx = 0; idx < 6; idx++)
                printf ("REG %02x = %02x\n", idx, sv_read(sc, idx));

        for (idx = 0; idx < 0x32; idx++)
                printf ("IREG %02x = %02x\n", idx, sv_read_indirect(sc, idx));

        for (idx = 0; idx < 0x10; idx++)
                printf ("DMA %02x = %02x\n", idx,
                        bus_space_read_1(sc->sc_iot, sc->sc_dmaa_ioh, idx));
}
#endif

static int
sv_intr(void *p)
{
        struct sv_softc *sc;
        uint8_t intr;

        sc = p;

        mutex_spin_enter(&sc->sc_intr_lock);

        intr = sv_read(sc, SV_CODEC_STATUS);
        DPRINTFN(5,("sv_intr: intr=0x%x\n", intr));

        if (intr & SV_INTSTATUS_DMAA) {
                if (sc->sc_pintr)
                        sc->sc_pintr(sc->sc_parg);
        }

        if (intr & SV_INTSTATUS_DMAC) {
                if (sc->sc_rintr)
                        sc->sc_rintr(sc->sc_rarg);
        }

        mutex_spin_exit(&sc->sc_intr_lock);

        return (intr & (SV_INTSTATUS_DMAA | SV_INTSTATUS_DMAC)) != 0;
}

static int
sv_allocmem(struct sv_softc *sc, size_t size, size_t align,
    int direction, struct sv_dma *p)
{
        int error;

        p->size = size;
        error = bus_dmamem_alloc(sc->sc_dmatag, p->size, align, 0,
            p->segs, ARRAY_SIZE(p->segs), &p->nsegs, BUS_DMA_WAITOK);
        if (error)
                return error;

        error = bus_dmamem_map(sc->sc_dmatag, p->segs, p->nsegs, p->size,
            &p->addr, BUS_DMA_WAITOK|BUS_DMA_COHERENT);
        if (error)
                goto free;

        error = bus_dmamap_create(sc->sc_dmatag, p->size, 1, p->size,
            0, BUS_DMA_WAITOK, &p->map);
        if (error)
                goto unmap;

        error = bus_dmamap_load(sc->sc_dmatag, p->map, p->addr, p->size, NULL,
            BUS_DMA_WAITOK | ((direction == AUMODE_RECORD) ? BUS_DMA_READ : BUS_DMA_WRITE));
        if (error)
                goto destroy;
        DPRINTF(("sv_allocmem: pa=%lx va=%lx pba=%lx\n",
            (long)p->segs[0].ds_addr, (long)KERNADDR(p), (long)DMAADDR(p)));
        return 0;

destroy:
        bus_dmamap_destroy(sc->sc_dmatag, p->map);
unmap:
        bus_dmamem_unmap(sc->sc_dmatag, p->addr, p->size);
free:
        bus_dmamem_free(sc->sc_dmatag, p->segs, p->nsegs);
        return error;
}

static int
sv_freemem(struct sv_softc *sc, struct sv_dma *p)
{

        bus_dmamap_unload(sc->sc_dmatag, p->map);
        bus_dmamap_destroy(sc->sc_dmatag, p->map);
        bus_dmamem_unmap(sc->sc_dmatag, p->addr, p->size);
        bus_dmamem_free(sc->sc_dmatag, p->segs, p->nsegs);
        return 0;
}

static int
sv_open(void *addr, int flags)
{
        struct sv_softc *sc;

        sc = addr;
        DPRINTF(("sv_open\n"));
        if (!sc->sc_dmaset)
                return ENXIO;

        return 0;
}

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

        return audio_query_format(sv_formats, SV_NFORMATS, afp);
}

static int
sv_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 sv_softc *sc;
        uint32_t val;

        sc = addr;

        /* *play and *rec are the identical because !AUDIO_PROP_INDEPENDENT. */

        val = play->sample_rate * 65536 / 48000;
        /*
         * If the sample rate is exactly 48 kHz, the fraction would overflow the
         * register, so we have to bias it.  This causes a little clock drift.
         * The drift is below normal crystal tolerance (.0001%), so although
         * this seems a little silly, we can pretty much ignore it.
         * (I tested the output speed with values of 1-20, just to be sure this
         * register isn't *supposed* to have a bias.  It isn't.)
         * - mycroft
         */
        if (val > 65535)
                val = 65535;

        mutex_spin_enter(&sc->sc_intr_lock);
        sv_write_indirect(sc, SV_PCM_SAMPLE_RATE_0, val & 0xff);
        sv_write_indirect(sc, SV_PCM_SAMPLE_RATE_1, val >> 8);
        mutex_spin_exit(&sc->sc_intr_lock);

#define F_REF 24576000

#define ABS(x) (((x) < 0) ? (-x) : (x))

        if (setmode & AUMODE_RECORD) {
                /* The ADC reference frequency (f_out) is 512 * sample rate */

                /* f_out is derived from the 24.576MHz crystal by three values:
                   M & N & R. The equation is as follows:

                   f_out = (m + 2) * f_ref / ((n + 2) * (2 ^ a))

                   with the constraint that:

                   80 MHz < (m + 2) / (n + 2) * f_ref <= 150MHz
                   and n, m >= 1
                */

                int  goal_f_out;
                int  a, n, m, best_n, best_m, best_error;
                int  pll_sample;
                int  error;

                goal_f_out = 512 * rec->sample_rate;
                best_n = 0;
                best_m = 0;
                best_error = 10000000;
                for (a = 0; a < 8; a++) {
                        if ((goal_f_out * (1 << a)) >= 80000000)
                                break;
                }

                /* a != 8 because sample_rate >= 2000 */

                for (n = 33; n > 2; n--) {
                        m = (goal_f_out * n * (1 << a)) / F_REF;
                        if ((m > 257) || (m < 3))
                                continue;

                        pll_sample = (m * F_REF) / (n * (1 << a));
                        pll_sample /= 512;

                        /* Threshold might be good here */
                        error = pll_sample - rec->sample_rate;
                        error = ABS(error);

                        if (error < best_error) {
                                best_error = error;
                                best_n = n;
                                best_m = m;
                                if (error == 0) break;
                        }
                }

                best_n -= 2;
                best_m -= 2;

                mutex_spin_enter(&sc->sc_intr_lock);
                sv_write_indirect(sc, SV_ADC_PLL_M, best_m);
                sv_write_indirect(sc, SV_ADC_PLL_N,
                                  best_n | (a << SV_PLL_R_SHIFT));
                mutex_spin_exit(&sc->sc_intr_lock);
        }

        return 0;
}

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

        blk = blk & -32;        /* keep good alignment */
        if (blk < 32)
                blk = 32;
        return blk;
}

static int
sv_trigger_output(void *addr, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, const audio_params_t *param)
{
        struct sv_softc *sc;
        struct sv_dma *p;
        uint8_t mode;
        int dma_count;

        DPRINTFN(1, ("sv_trigger_output: sc=%p start=%p end=%p blksize=%d "
            "intr=%p(%p)\n", addr, start, end, blksize, intr, arg));
        sc = addr;
        sc->sc_pintr = intr;
        sc->sc_parg = arg;

        mode = sv_read_indirect(sc, SV_DMA_DATA_FORMAT);
        mode &= ~(SV_DMAA_FORMAT16 | SV_DMAA_STEREO);
        if (param->precision == 16)
                mode |= SV_DMAA_FORMAT16;
        if (param->channels == 2)
                mode |= SV_DMAA_STEREO;
        sv_write_indirect(sc, SV_DMA_DATA_FORMAT, mode);

        for (p = sc->sc_dmas; p && KERNADDR(p) != start; p = p->next)
                continue;
        if (p == NULL) {
                printf("sv_trigger_output: bad addr %p\n", start);
                return EINVAL;
        }

        dma_count = ((char *)end - (char *)start) - 1;
        DPRINTF(("sv_trigger_output: DMA start loop input addr=%x cc=%d\n",
            (int)DMAADDR(p), dma_count));

        bus_space_write_4(sc->sc_iot, sc->sc_dmaa_ioh, SV_DMA_ADDR0,
                          DMAADDR(p));
        bus_space_write_4(sc->sc_iot, sc->sc_dmaa_ioh, SV_DMA_COUNT0,
                          dma_count);
        bus_space_write_1(sc->sc_iot, sc->sc_dmaa_ioh, SV_DMA_MODE,
                          DMA37MD_READ | DMA37MD_LOOP);

        DPRINTF(("sv_trigger_output: current addr=%x\n",
            bus_space_read_4(sc->sc_iot, sc->sc_dmaa_ioh, SV_DMA_ADDR0)));

        dma_count = blksize - 1;

        sv_write_indirect(sc, SV_DMAA_COUNT1, dma_count >> 8);
        sv_write_indirect(sc, SV_DMAA_COUNT0, dma_count & 0xFF);

        mode = sv_read_indirect(sc, SV_PLAY_RECORD_ENABLE);
        sv_write_indirect(sc, SV_PLAY_RECORD_ENABLE, mode | SV_PLAY_ENABLE);

        return 0;
}

static int
sv_trigger_input(void *addr, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, const audio_params_t *param)
{
        struct sv_softc *sc;
        struct sv_dma *p;
        uint8_t mode;
        int dma_count;

        DPRINTFN(1, ("sv_trigger_input: sc=%p start=%p end=%p blksize=%d "
            "intr=%p(%p)\n", addr, start, end, blksize, intr, arg));
        sc = addr;
        sc->sc_rintr = intr;
        sc->sc_rarg = arg;

        mode = sv_read_indirect(sc, SV_DMA_DATA_FORMAT);
        mode &= ~(SV_DMAC_FORMAT16 | SV_DMAC_STEREO);
        if (param->precision == 16)
                mode |= SV_DMAC_FORMAT16;
        if (param->channels == 2)
                mode |= SV_DMAC_STEREO;
        sv_write_indirect(sc, SV_DMA_DATA_FORMAT, mode);

        for (p = sc->sc_dmas; p && KERNADDR(p) != start; p = p->next)
                continue;
        if (!p) {
                printf("sv_trigger_input: bad addr %p\n", start);
                return EINVAL;
        }

        dma_count = (((char *)end - (char *)start) >> 1) - 1;
        DPRINTF(("sv_trigger_input: DMA start loop input addr=%x cc=%d\n",
            (int)DMAADDR(p), dma_count));

        bus_space_write_4(sc->sc_iot, sc->sc_dmac_ioh, SV_DMA_ADDR0,
                          DMAADDR(p));
        bus_space_write_4(sc->sc_iot, sc->sc_dmac_ioh, SV_DMA_COUNT0,
                          dma_count);
        bus_space_write_1(sc->sc_iot, sc->sc_dmac_ioh, SV_DMA_MODE,
                          DMA37MD_WRITE | DMA37MD_LOOP);

        DPRINTF(("sv_trigger_input: current addr=%x\n",
            bus_space_read_4(sc->sc_iot, sc->sc_dmac_ioh, SV_DMA_ADDR0)));

        dma_count = (blksize >> 1) - 1;

        sv_write_indirect(sc, SV_DMAC_COUNT1, dma_count >> 8);
        sv_write_indirect(sc, SV_DMAC_COUNT0, dma_count & 0xFF);

        mode = sv_read_indirect(sc, SV_PLAY_RECORD_ENABLE);
        sv_write_indirect(sc, SV_PLAY_RECORD_ENABLE, mode | SV_RECORD_ENABLE);

        return 0;
}

static int
sv_halt_output(void *addr)
{
        struct sv_softc *sc;
        uint8_t mode;

        DPRINTF(("sv: sv_halt_output\n"));
        sc = addr;
        mode = sv_read_indirect(sc, SV_PLAY_RECORD_ENABLE);
        sv_write_indirect(sc, SV_PLAY_RECORD_ENABLE, mode & ~SV_PLAY_ENABLE);
        sc->sc_pintr = 0;

        return 0;
}

static int
sv_halt_input(void *addr)
{
        struct sv_softc *sc;
        uint8_t mode;

        DPRINTF(("sv: sv_halt_input\n"));
        sc = addr;
        mode = sv_read_indirect(sc, SV_PLAY_RECORD_ENABLE);
        sv_write_indirect(sc, SV_PLAY_RECORD_ENABLE, mode & ~SV_RECORD_ENABLE);
        sc->sc_rintr = 0;

        return 0;
}

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

        *retp = sv_device;
        return 0;
}


/*
 * Mixer related code is here
 *
 */

#define SV_INPUT_CLASS 0
#define SV_OUTPUT_CLASS 1
#define SV_RECORD_CLASS 2

#define SV_LAST_CLASS 2

static const char *mixer_classes[] =
        { AudioCinputs, AudioCoutputs, AudioCrecord };

static const struct {
        uint8_t   l_port;
        uint8_t   r_port;
        uint8_t   mask;
        uint8_t   class;
        const char *audio;
} ports[] = {
  { SV_LEFT_AUX1_INPUT_CONTROL, SV_RIGHT_AUX1_INPUT_CONTROL, SV_AUX1_MASK,
    SV_INPUT_CLASS, "aux1" },
  { SV_LEFT_CD_INPUT_CONTROL, SV_RIGHT_CD_INPUT_CONTROL, SV_CD_MASK,
    SV_INPUT_CLASS, AudioNcd },
  { SV_LEFT_LINE_IN_INPUT_CONTROL, SV_RIGHT_LINE_IN_INPUT_CONTROL, SV_LINE_IN_MASK,
    SV_INPUT_CLASS, AudioNline },
  { SV_MIC_INPUT_CONTROL, 0, SV_MIC_MASK, SV_INPUT_CLASS, AudioNmicrophone },
  { SV_LEFT_SYNTH_INPUT_CONTROL, SV_RIGHT_SYNTH_INPUT_CONTROL,
    SV_SYNTH_MASK, SV_INPUT_CLASS, AudioNfmsynth },
  { SV_LEFT_AUX2_INPUT_CONTROL, SV_RIGHT_AUX2_INPUT_CONTROL, SV_AUX2_MASK,
    SV_INPUT_CLASS, "aux2" },
  { SV_LEFT_PCM_INPUT_CONTROL, SV_RIGHT_PCM_INPUT_CONTROL, SV_PCM_MASK,
    SV_INPUT_CLASS, AudioNdac },
  { SV_LEFT_MIXER_OUTPUT_CONTROL, SV_RIGHT_MIXER_OUTPUT_CONTROL,
    SV_MIXER_OUT_MASK, SV_OUTPUT_CLASS, AudioNmaster }
};


static const struct {
        int idx;
        const char *name;
} record_sources[] = {
        { SV_REC_CD, AudioNcd },
        { SV_REC_DAC, AudioNdac },
        { SV_REC_AUX2, "aux2" },
        { SV_REC_LINE, AudioNline },
        { SV_REC_AUX1, "aux1" },
        { SV_REC_MIC, AudioNmicrophone },
        { SV_REC_MIXER, AudioNmixerout }
};


#define SV_DEVICES_PER_PORT 2
#define SV_FIRST_MIXER (SV_LAST_CLASS + 1)
#define SV_LAST_MIXER (SV_DEVICES_PER_PORT * (ARRAY_SIZE(ports)) + SV_LAST_CLASS)
#define SV_RECORD_SOURCE (SV_LAST_MIXER + 1)
#define SV_MIC_BOOST (SV_LAST_MIXER + 2)
#define SV_RECORD_GAIN (SV_LAST_MIXER + 3)
#define SV_SRS_MODE (SV_LAST_MIXER + 4)

static int
sv_query_devinfo(void *addr, mixer_devinfo_t *dip)
{
        int i;

        /* It's a class */
        if (dip->index <= SV_LAST_CLASS) {
                dip->type = AUDIO_MIXER_CLASS;
                dip->mixer_class = dip->index;
                dip->next = dip->prev = AUDIO_MIXER_LAST;
                strcpy(dip->label.name, mixer_classes[dip->index]);
                return 0;
        }

        if (dip->index >= SV_FIRST_MIXER &&
            dip->index <= SV_LAST_MIXER) {
                int off, mute ,idx;

                off = dip->index - SV_FIRST_MIXER;
                mute = (off % SV_DEVICES_PER_PORT);
                idx = off / SV_DEVICES_PER_PORT;
                dip->mixer_class = ports[idx].class;
                strcpy(dip->label.name, ports[idx].audio);

                if (!mute) {
                        dip->type = AUDIO_MIXER_VALUE;
                        dip->prev = AUDIO_MIXER_LAST;
                        dip->next = dip->index + 1;

                        if (ports[idx].r_port != 0)
                                dip->un.v.num_channels = 2;
                        else
                                dip->un.v.num_channels = 1;

                        strcpy(dip->un.v.units.name, AudioNvolume);
                } else {
                        dip->type = AUDIO_MIXER_ENUM;
                        dip->prev = dip->index - 1;
                        dip->next = AUDIO_MIXER_LAST;

                        strcpy(dip->label.name, AudioNmute);
                        dip->un.e.num_mem = 2;
                        strcpy(dip->un.e.member[0].label.name, AudioNoff);
                        dip->un.e.member[0].ord = 0;
                        strcpy(dip->un.e.member[1].label.name, AudioNon);
                        dip->un.e.member[1].ord = 1;
                }

                return 0;
        }

        switch (dip->index) {
        case SV_RECORD_SOURCE:
                dip->mixer_class = SV_RECORD_CLASS;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = SV_RECORD_GAIN;
                strcpy(dip->label.name, AudioNsource);
                dip->type = AUDIO_MIXER_ENUM;

                dip->un.e.num_mem = ARRAY_SIZE(record_sources);
                for (i = 0; i < ARRAY_SIZE(record_sources); i++) {
                        strcpy(dip->un.e.member[i].label.name,
                               record_sources[i].name);
                        dip->un.e.member[i].ord = record_sources[i].idx;
                }
                return 0;

        case SV_RECORD_GAIN:
                dip->mixer_class = SV_RECORD_CLASS;
                dip->prev = SV_RECORD_SOURCE;
                dip->next = AUDIO_MIXER_LAST;
                strcpy(dip->label.name, "gain");
                dip->type = AUDIO_MIXER_VALUE;
                dip->un.v.num_channels = 1;
                strcpy(dip->un.v.units.name, AudioNvolume);
                return 0;

        case SV_MIC_BOOST:
                dip->mixer_class = SV_RECORD_CLASS;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = AUDIO_MIXER_LAST;
                strcpy(dip->label.name, "micboost");
                goto on_off;

        case SV_SRS_MODE:
                dip->mixer_class = SV_OUTPUT_CLASS;
                dip->prev = dip->next = AUDIO_MIXER_LAST;
                strcpy(dip->label.name, AudioNspatial);

        on_off:
                dip->type = AUDIO_MIXER_ENUM;
                dip->un.e.num_mem = 2;
                strcpy(dip->un.e.member[0].label.name, AudioNoff);
                dip->un.e.member[0].ord = 0;
                strcpy(dip->un.e.member[1].label.name, AudioNon);
                dip->un.e.member[1].ord = 1;
                return 0;
        }

        return ENXIO;
}

static int
sv_mixer_set_port(void *addr, mixer_ctrl_t *cp)
{
        struct sv_softc *sc;
        uint8_t reg;
        int idx;

        sc = addr;
        if (cp->dev >= SV_FIRST_MIXER &&
            cp->dev <= SV_LAST_MIXER) {
                int off, mute;

                off = cp->dev - SV_FIRST_MIXER;
                mute = (off % SV_DEVICES_PER_PORT);
                idx = off / SV_DEVICES_PER_PORT;

                if (mute) {
                        if (cp->type != AUDIO_MIXER_ENUM)
                                return EINVAL;

                        mutex_spin_enter(&sc->sc_intr_lock);
                        reg = sv_read_indirect(sc, ports[idx].l_port);
                        if (cp->un.ord)
                                reg |= SV_MUTE_BIT;
                        else
                                reg &= ~SV_MUTE_BIT;
                        sv_write_indirect(sc, ports[idx].l_port, reg);

                        if (ports[idx].r_port) {
                                reg = sv_read_indirect(sc, ports[idx].r_port);
                                if (cp->un.ord)
                                        reg |= SV_MUTE_BIT;
                                else
                                        reg &= ~SV_MUTE_BIT;
                                sv_write_indirect(sc, ports[idx].r_port, reg);
                        }
                        mutex_spin_exit(&sc->sc_intr_lock);
                } else {
                        int  lval, rval;

                        if (cp->type != AUDIO_MIXER_VALUE)
                                return EINVAL;

                        if (cp->un.value.num_channels != 1 &&
                            cp->un.value.num_channels != 2)
                                return (EINVAL);

                        if (ports[idx].r_port == 0) {
                                if (cp->un.value.num_channels != 1)
                                        return (EINVAL);
                                lval = cp->un.value.level[AUDIO_MIXER_LEVEL_MONO];
                                rval = 0; /* shut up GCC */
                        } else {
                                if (cp->un.value.num_channels != 2)
                                        return (EINVAL);

                                lval = cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT];
                                rval = cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT];
                        }

                        mutex_spin_enter(&sc->sc_intr_lock);
                        reg = sv_read_indirect(sc, ports[idx].l_port);
                        reg &= ~(ports[idx].mask);
                        lval = (AUDIO_MAX_GAIN - lval) * ports[idx].mask /
                                AUDIO_MAX_GAIN;
                        reg |= lval;
                        sv_write_indirect(sc, ports[idx].l_port, reg);

                        if (ports[idx].r_port != 0) {
                                reg = sv_read_indirect(sc, ports[idx].r_port);
                                reg &= ~(ports[idx].mask);

                                rval = (AUDIO_MAX_GAIN - rval) * ports[idx].mask /
                                        AUDIO_MAX_GAIN;
                                reg |= rval;

                                sv_write_indirect(sc, ports[idx].r_port, reg);
                        }

                        sv_read_indirect(sc, ports[idx].l_port);
                        mutex_spin_exit(&sc->sc_intr_lock);
                }

                return 0;
        }


        switch (cp->dev) {
        case SV_RECORD_SOURCE:
                if (cp->type != AUDIO_MIXER_ENUM)
                        return EINVAL;

                for (idx = 0; idx < ARRAY_SIZE(record_sources); idx++) {
                        if (record_sources[idx].idx == cp->un.ord)
                                goto found;
                }

                return EINVAL;

        found:
                mutex_spin_enter(&sc->sc_intr_lock);
                reg = sv_read_indirect(sc, SV_LEFT_ADC_INPUT_CONTROL);
                reg &= ~SV_REC_SOURCE_MASK;
                reg |= (((cp->un.ord) << SV_REC_SOURCE_SHIFT) & SV_REC_SOURCE_MASK);
                sv_write_indirect(sc, SV_LEFT_ADC_INPUT_CONTROL, reg);

                reg = sv_read_indirect(sc, SV_RIGHT_ADC_INPUT_CONTROL);
                reg &= ~SV_REC_SOURCE_MASK;
                reg |= (((cp->un.ord) << SV_REC_SOURCE_SHIFT) & SV_REC_SOURCE_MASK);
                sv_write_indirect(sc, SV_RIGHT_ADC_INPUT_CONTROL, reg);
                mutex_spin_exit(&sc->sc_intr_lock);
                return 0;

        case SV_RECORD_GAIN:
        {
                int val;

                if (cp->type != AUDIO_MIXER_VALUE)
                        return EINVAL;

                if (cp->un.value.num_channels != 1)
                        return EINVAL;

                val = (cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]
                    * SV_REC_GAIN_MASK) / AUDIO_MAX_GAIN;

                mutex_spin_enter(&sc->sc_intr_lock);
                reg = sv_read_indirect(sc, SV_LEFT_ADC_INPUT_CONTROL);
                reg &= ~SV_REC_GAIN_MASK;
                reg |= val;
                sv_write_indirect(sc, SV_LEFT_ADC_INPUT_CONTROL, reg);

                reg = sv_read_indirect(sc, SV_RIGHT_ADC_INPUT_CONTROL);
                reg &= ~SV_REC_GAIN_MASK;
                reg |= val;
                sv_write_indirect(sc, SV_RIGHT_ADC_INPUT_CONTROL, reg);
                mutex_spin_exit(&sc->sc_intr_lock);
        }
        return (0);

        case SV_MIC_BOOST:
                if (cp->type != AUDIO_MIXER_ENUM)
                        return EINVAL;

                mutex_spin_enter(&sc->sc_intr_lock);
                reg = sv_read_indirect(sc, SV_LEFT_ADC_INPUT_CONTROL);
                if (cp->un.ord) {
                        reg |= SV_MIC_BOOST_BIT;
                } else {
                        reg &= ~SV_MIC_BOOST_BIT;
                }

                sv_write_indirect(sc, SV_LEFT_ADC_INPUT_CONTROL, reg);
                mutex_spin_exit(&sc->sc_intr_lock);
                return 0;

        case SV_SRS_MODE:
                if (cp->type != AUDIO_MIXER_ENUM)
                        return EINVAL;

                mutex_spin_enter(&sc->sc_intr_lock);
                reg = sv_read_indirect(sc, SV_SRS_SPACE_CONTROL);
                if (cp->un.ord) {
                        reg &= ~SV_SRS_SPACE_ONOFF;
                } else {
                        reg |= SV_SRS_SPACE_ONOFF;
                }

                sv_write_indirect(sc, SV_SRS_SPACE_CONTROL, reg);
                mutex_spin_exit(&sc->sc_intr_lock);
                return 0;
        }

        return EINVAL;
}

static int
sv_mixer_get_port(void *addr, mixer_ctrl_t *cp)
{
        struct sv_softc *sc;
        int val, error;
        uint8_t reg;

        sc = addr;
        error = 0;

        mutex_spin_enter(&sc->sc_intr_lock);

        if (cp->dev >= SV_FIRST_MIXER &&
            cp->dev <= SV_LAST_MIXER) {
                int off = cp->dev - SV_FIRST_MIXER;
                int mute = (off % 2);
                int idx = off / 2;

                off = cp->dev - SV_FIRST_MIXER;
                mute = (off % 2);
                idx = off / 2;
                if (mute) {
                        if (cp->type != AUDIO_MIXER_ENUM)
                                error = EINVAL;
                        else {
                                reg = sv_read_indirect(sc, ports[idx].l_port);
                                cp->un.ord = ((reg & SV_MUTE_BIT) ? 1 : 0);
                        }
                } else {
                        if (cp->type != AUDIO_MIXER_VALUE ||
                            (cp->un.value.num_channels != 1 &&
                            cp->un.value.num_channels != 2) ||
                           ((ports[idx].r_port == 0 &&
                             cp->un.value.num_channels != 1) ||
                            (ports[idx].r_port != 0 &&
                             cp->un.value.num_channels != 2)))
                                error = EINVAL;
                        else {
                                reg = sv_read_indirect(sc, ports[idx].l_port);
                                reg &= ports[idx].mask;

                                val = AUDIO_MAX_GAIN -
                                    ((reg * AUDIO_MAX_GAIN) / ports[idx].mask);

                                if (ports[idx].r_port != 0) {
                                        cp->un.value.level
                                            [AUDIO_MIXER_LEVEL_LEFT] = val;

                                        reg = sv_read_indirect(sc,
                                            ports[idx].r_port);
                                        reg &= ports[idx].mask;

                                        val = AUDIO_MAX_GAIN -
                                            ((reg * AUDIO_MAX_GAIN)
                                            / ports[idx].mask);
                                        cp->un.value.level
                                            [AUDIO_MIXER_LEVEL_RIGHT] = val;
                                } else
                                        cp->un.value.level
                                            [AUDIO_MIXER_LEVEL_MONO] = val;
                        }
                }

                mutex_spin_exit(&sc->sc_intr_lock);
                return error;
        }

        switch (cp->dev) {
        case SV_RECORD_SOURCE:
                if (cp->type != AUDIO_MIXER_ENUM) {
                        error = EINVAL;
                        break;
                }

                reg = sv_read_indirect(sc, SV_LEFT_ADC_INPUT_CONTROL);
                cp->un.ord = ((reg & SV_REC_SOURCE_MASK) >> SV_REC_SOURCE_SHIFT);

                break;

        case SV_RECORD_GAIN:
                if (cp->type != AUDIO_MIXER_VALUE) {
                        error = EINVAL;
                        break;
                }
                if (cp->un.value.num_channels != 1) {
                        error = EINVAL;
                        break;
                }

                reg = sv_read_indirect(sc, SV_LEFT_ADC_INPUT_CONTROL) & SV_REC_GAIN_MASK;
                cp->un.value.level[AUDIO_MIXER_LEVEL_MONO] =
                        (((unsigned int)reg) * AUDIO_MAX_GAIN) / SV_REC_GAIN_MASK;

                break;

        case SV_MIC_BOOST:
                if (cp->type != AUDIO_MIXER_ENUM) {
                        error = EINVAL;
                        break;
                }
                reg = sv_read_indirect(sc, SV_LEFT_ADC_INPUT_CONTROL);
                cp->un.ord = ((reg & SV_MIC_BOOST_BIT) ? 1 : 0);
                break;

        case SV_SRS_MODE:
                if (cp->type != AUDIO_MIXER_ENUM) {
                        error = EINVAL;
                        break;
                }
                reg = sv_read_indirect(sc, SV_SRS_SPACE_CONTROL);
                cp->un.ord = ((reg & SV_SRS_SPACE_ONOFF) ? 0 : 1);
                break;
        default:
                error = EINVAL;
                break;
        }

        mutex_spin_exit(&sc->sc_intr_lock);
        return error;
}

static void
sv_init_mixer(struct sv_softc *sc)
{
        mixer_ctrl_t cp;
        int i;

        cp.type = AUDIO_MIXER_ENUM;
        cp.dev = SV_SRS_MODE;
        cp.un.ord = 0;

        sv_mixer_set_port(sc, &cp);

        for (i = 0; i < ARRAY_SIZE(ports); i++) {
                if (!strcmp(ports[i].audio, AudioNdac)) {
                        cp.type = AUDIO_MIXER_ENUM;
                        cp.dev = SV_FIRST_MIXER + i * SV_DEVICES_PER_PORT + 1;
                        cp.un.ord = 0;
                        sv_mixer_set_port(sc, &cp);
                        break;
                }
        }
}

static void *
sv_malloc(void *addr, int direction, size_t size)
{
        struct sv_softc *sc;
        struct sv_dma *p;
        int error;

        sc = addr;
        p = kmem_alloc(sizeof(*p), KM_SLEEP);
        error = sv_allocmem(sc, size, 16, direction, p);
        if (error) {
                kmem_free(p, sizeof(*p));
                return 0;
        }
        p->next = sc->sc_dmas;
        sc->sc_dmas = p;
        return KERNADDR(p);
}

static void
sv_free(void *addr, void *ptr, size_t size)
{
        struct sv_softc *sc;
        struct sv_dma **pp, *p;

        sc = addr;
        for (pp = &sc->sc_dmas; (p = *pp) != NULL; pp = &p->next) {
                if (KERNADDR(p) == ptr) {
                        sv_freemem(sc, p);
                        *pp = p->next;
                        kmem_free(p, sizeof(*p));
                        return;
                }
        }
}

static int
sv_get_props(void *addr)
{

        return AUDIO_PROP_PLAYBACK | AUDIO_PROP_CAPTURE |
            AUDIO_PROP_FULLDUPLEX;
}

static void
sv_get_locks(void *addr, kmutex_t **intr, kmutex_t **thread)
{
        struct sv_softc *sc;

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