/*      $NetBSD: auacer.c,v 1.39 2020/02/29 06:34:30 isaki Exp $        */

/*-
 * Copyright (c) 2004, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Lennart Augustsson.
 *
 * 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.
 */

/*
 * Acer Labs M5455 audio driver
 *
 * Acer provides data sheets after signing an NDA, so this is guess work.
 * The chip behaves somewhat like the Intel i8x0, so this driver
 * is loosely based on the auich driver.  Additional information taken from
 * the ALSA intel8x0.c driver (which handles M5455 as well).
 *
 * As an historical note one can observe that the auich driver borrows
 * lot from the first NetBSD PCI audio driver, the eap driver.  But this
 * is not attributed anywhere.
 */


#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: auacer.c,v 1.39 2020/02/29 06:34:30 isaki Exp $");

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

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

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

#include <sys/bus.h>

#include <dev/ic/ac97reg.h>
#include <dev/ic/ac97var.h>

struct auacer_dma {
        bus_dmamap_t map;
        void *addr;
        bus_dma_segment_t segs[1];
        int nsegs;
        size_t size;
        struct auacer_dma *next;
};

#define DMAADDR(p)      ((p)->map->dm_segs[0].ds_addr)
#define KERNADDR(p)     ((void *)((p)->addr))

struct auacer_cdata {
        struct auacer_dmalist ic_dmalist_pcmo[ALI_DMALIST_MAX];
};

struct auacer_chan {
        uint32_t ptr;
        uint32_t start, p, end;
        uint32_t blksize, fifoe;
        uint32_t ack;
        uint32_t port;
        struct auacer_dmalist *dmalist;
        void (*intr)(void *);
        void *arg;
};

struct auacer_softc {
        device_t sc_dev;
        void *sc_ih;
        kmutex_t sc_lock;
        kmutex_t sc_intr_lock;

        audio_device_t sc_audev;

        bus_space_tag_t iot;
        bus_space_handle_t mix_ioh;
        bus_space_handle_t aud_ioh;
        bus_dma_tag_t dmat;

        struct ac97_codec_if *codec_if;
        struct ac97_host_if host_if;

        /* DMA scatter-gather lists. */
        bus_dmamap_t sc_cddmamap;
#define sc_cddma        sc_cddmamap->dm_segs[0].ds_addr

        struct auacer_cdata *sc_cdata;

        struct auacer_chan sc_pcmo;

        struct auacer_dma *sc_dmas;

        pci_chipset_tag_t sc_pc;
        pcitag_t sc_pt;

        int  sc_dmamap_flags;

#define AUACER_NFORMATS 3
        struct audio_format sc_formats[AUACER_NFORMATS];
};

#define READ1(sc, a) bus_space_read_1(sc->iot, sc->aud_ioh, a)
#define READ2(sc, a) bus_space_read_2(sc->iot, sc->aud_ioh, a)
#define READ4(sc, a) bus_space_read_4(sc->iot, sc->aud_ioh, a)
#define WRITE1(sc, a, v) bus_space_write_1(sc->iot, sc->aud_ioh, a, v)
#define WRITE2(sc, a, v) bus_space_write_2(sc->iot, sc->aud_ioh, a, v)
#define WRITE4(sc, a, v) bus_space_write_4(sc->iot, sc->aud_ioh, a, v)

/* Debug */
#ifdef AUACER_DEBUG
#define DPRINTF(l,x)    do { if (auacer_debug & (l)) printf x; } while(0)
int auacer_debug = 0;
#define ALI_DEBUG_CODECIO       0x0001
#define ALI_DEBUG_DMA           0x0002
#define ALI_DEBUG_INTR          0x0004
#define ALI_DEBUG_API           0x0008
#define ALI_DEBUG_MIXERAPI      0x0010
#else
#define DPRINTF(x,y)    /* nothing */
#endif

static int      auacer_intr(void *);

static int      auacer_query_format(void *, audio_format_query_t *);
static int      auacer_set_format(void *, int,
                                 const audio_params_t *, const audio_params_t *,
                                 audio_filter_reg_t *, audio_filter_reg_t *);
static int      auacer_halt_output(void *);
static int      auacer_halt_input(void *);
static int      auacer_getdev(void *, struct audio_device *);
static int      auacer_set_port(void *, mixer_ctrl_t *);
static int      auacer_get_port(void *, mixer_ctrl_t *);
static int      auacer_query_devinfo(void *, mixer_devinfo_t *);
static void     *auacer_allocm(void *, int, size_t);
static void     auacer_freem(void *, void *, size_t);
static size_t   auacer_round_buffersize(void *, int, size_t);
static int      auacer_get_props(void *);
static int      auacer_trigger_output(void *, void *, void *, int,
                                      void (*)(void *), void *,
                                      const audio_params_t *);
static int      auacer_trigger_input(void *, void *, void *, int,
                                     void (*)(void *), void *,
                                     const audio_params_t *);

static int      auacer_alloc_cdata(struct auacer_softc *);

static int      auacer_allocmem(struct auacer_softc *, size_t, size_t,
                                struct auacer_dma *);
static int      auacer_freemem(struct auacer_softc *, struct auacer_dma *);
static void     auacer_get_locks(void *, kmutex_t **, kmutex_t **);

static bool     auacer_resume(device_t, const pmf_qual_t *);
static int      auacer_set_rate(struct auacer_softc *, int, u_int);

static void auacer_reset(struct auacer_softc *sc);

static const struct audio_hw_if auacer_hw_if = {
        .query_format           = auacer_query_format,
        .set_format             = auacer_set_format,
        .halt_output            = auacer_halt_output,
        .halt_input             = auacer_halt_input,
        .getdev                 = auacer_getdev,
        .set_port               = auacer_set_port,
        .get_port               = auacer_get_port,
        .query_devinfo          = auacer_query_devinfo,
        .allocm                 = auacer_allocm,
        .freem                  = auacer_freem,
        .round_buffersize       = auacer_round_buffersize,
        .get_props              = auacer_get_props,
        .trigger_output         = auacer_trigger_output,
        .trigger_input          = auacer_trigger_input,
        .get_locks              = auacer_get_locks,
};

#define AUACER_FORMATS_4CH      1
#define AUACER_FORMATS_6CH      2
#define AUACER_FORMAT(aumode, ch, chmask) \
        { \
                .mode           = (aumode), \
                .encoding       = AUDIO_ENCODING_SLINEAR_LE, \
                .validbits      = 16, \
                .precision      = 16, \
                .channels       = (ch), \
                .channel_mask   = (chmask), \
                .frequency_type = 9, \
                .frequency      = {  8000, 11025, 12000, 16000, 22050, \
                                    24000, 32000, 44100, 48000, }, \
        }
static const struct audio_format auacer_formats[AUACER_NFORMATS] = {
        AUACER_FORMAT(AUMODE_PLAY | AUMODE_RECORD, 2, AUFMT_STEREO),
        AUACER_FORMAT(AUMODE_PLAY                , 4, AUFMT_SURROUND4),
        AUACER_FORMAT(AUMODE_PLAY                , 6, AUFMT_DOLBY_5_1),
};

static int      auacer_attach_codec(void *, struct ac97_codec_if *);
static int      auacer_read_codec(void *, uint8_t, uint16_t *);
static int      auacer_write_codec(void *, uint8_t, uint16_t);
static int      auacer_reset_codec(void *);

static int
auacer_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_ALI &&
            PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_ALI_M5455)
                return 1;
        return 0;
}

static void
auacer_attach(device_t parent, device_t self, void *aux)
{
        struct auacer_softc *sc;
        struct pci_attach_args *pa;
        pci_intr_handle_t ih;
        bus_size_t aud_size;
        pcireg_t v;
        const char *intrstr;
        int i;
        char intrbuf[PCI_INTRSTR_LEN];

        sc = device_private(self);
        sc->sc_dev = self;
        pa = aux;
        aprint_normal(": Acer Labs M5455 Audio controller\n");

        if (pci_mapreg_map(pa, 0x10, PCI_MAPREG_TYPE_IO, 0, &sc->iot,
                &sc->aud_ioh, NULL, &aud_size)) {
                aprint_error(": can't map i/o space\n");
                return;
        }

        sc->sc_pc = pa->pa_pc;
        sc->sc_pt = pa->pa_tag;
        sc->dmat = pa->pa_dmat;

        sc->sc_dmamap_flags = BUS_DMA_COHERENT; /* XXX remove */

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

        /* enable bus mastering */
        v = pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
        pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
            v | PCI_COMMAND_MASTER_ENABLE);

        /* Map and establish the interrupt. */
        if (pci_intr_map(pa, &ih)) {
                aprint_error_dev(sc->sc_dev, "can't map interrupt\n");
                mutex_destroy(&sc->sc_lock);
                mutex_destroy(&sc->sc_intr_lock);
                return;
        }
        intrstr = pci_intr_string(pa->pa_pc, ih, intrbuf, sizeof(intrbuf));
        sc->sc_ih = pci_intr_establish_xname(pa->pa_pc, ih, IPL_AUDIO,
            auacer_intr, sc, device_xname(self));
        if (sc->sc_ih == NULL) {
                aprint_error_dev(sc->sc_dev, "can'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(sc->sc_dev, "interrupting at %s\n", intrstr);

        strlcpy(sc->sc_audev.name, "M5455 AC97", MAX_AUDIO_DEV_LEN);
        snprintf(sc->sc_audev.version, MAX_AUDIO_DEV_LEN,
                 "0x%02x", PCI_REVISION(pa->pa_class));
        strlcpy(sc->sc_audev.config, device_xname(sc->sc_dev), MAX_AUDIO_DEV_LEN);

        /* Set up DMA lists. */
        auacer_alloc_cdata(sc);
        sc->sc_pcmo.dmalist = sc->sc_cdata->ic_dmalist_pcmo;
        sc->sc_pcmo.ptr = 0;
        sc->sc_pcmo.port = ALI_BASE_PO;

        DPRINTF(ALI_DEBUG_DMA, ("auacer_attach: lists %p\n",
            sc->sc_pcmo.dmalist));

        sc->host_if.arg = sc;
        sc->host_if.attach = auacer_attach_codec;
        sc->host_if.read = auacer_read_codec;
        sc->host_if.write = auacer_write_codec;
        sc->host_if.reset = auacer_reset_codec;

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

        /* setup audio_format */
        memcpy(sc->sc_formats, auacer_formats, sizeof(auacer_formats));
        mutex_enter(&sc->sc_lock);
        if (!AC97_IS_4CH(sc->codec_if))
                AUFMT_INVALIDATE(&sc->sc_formats[AUACER_FORMATS_4CH]);
        if (!AC97_IS_6CH(sc->codec_if))
                AUFMT_INVALIDATE(&sc->sc_formats[AUACER_FORMATS_6CH]);
        if (AC97_IS_FIXED_RATE(sc->codec_if)) {
                for (i = 0; i < AUACER_NFORMATS; i++) {
                        sc->sc_formats[i].frequency_type = 1;
                        sc->sc_formats[i].frequency[0] = 48000;
                }
        }

        mutex_spin_enter(&sc->sc_intr_lock);
        auacer_reset(sc);
        mutex_spin_exit(&sc->sc_intr_lock);
        mutex_exit(&sc->sc_lock);

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

        if (!pmf_device_register(self, NULL, auacer_resume))
                aprint_error_dev(self, "couldn't establish power handler\n");
}

CFATTACH_DECL_NEW(auacer, sizeof(struct auacer_softc),
    auacer_match, auacer_attach, NULL, NULL);

static int
auacer_ready_codec(struct auacer_softc *sc, int mask)
{
        int count;

        for (count = 0; count < 0x7f; count++) {
                int val = READ1(sc, ALI_CSPSR);
                if (val & mask)
                        return 0;
        }

        aprint_normal("auacer_ready_codec: AC97 codec ready timeout.\n");
        return EBUSY;
}

static int
auacer_sema_codec(struct auacer_softc *sc)
{
        int ttime;

        ttime = 100;
        while (ttime-- && (READ4(sc, ALI_CAS) & ALI_CAS_SEM_BUSY))
                delay(1);
        if (!ttime)
                aprint_normal("auacer_sema_codec: timeout\n");
        return auacer_ready_codec(sc, ALI_CSPSR_CODEC_READY);
}

static int
auacer_read_codec(void *v, uint8_t reg, uint16_t *val)
{
        struct auacer_softc *sc;

        sc = v;
        if (auacer_sema_codec(sc))
                return EIO;

        reg |= ALI_CPR_ADDR_READ;
#if 0
        if (ac97->num)
                reg |= ALI_CPR_ADDR_SECONDARY;
#endif
        WRITE2(sc, ALI_CPR_ADDR, reg);
        if (auacer_ready_codec(sc, ALI_CSPSR_READ_OK))
                return EIO;
        *val = READ2(sc, ALI_SPR);

        DPRINTF(ALI_DEBUG_CODECIO, ("auacer_read_codec: reg=0x%x val=0x%x\n",
                                    reg, *val));

        return 0;
}

int
auacer_write_codec(void *v, uint8_t reg, uint16_t val)
{
        struct auacer_softc *sc;

        DPRINTF(ALI_DEBUG_CODECIO, ("auacer_write_codec: reg=0x%x val=0x%x\n",
                                    reg, val));
        sc = v;
        if (auacer_sema_codec(sc))
                return EIO;
        WRITE2(sc, ALI_CPR, val);
#if 0
        if (ac97->num)
                reg |= ALI_CPR_ADDR_SECONDARY;
#endif
        WRITE2(sc, ALI_CPR_ADDR, reg);
        auacer_ready_codec(sc, ALI_CSPSR_WRITE_OK);
        return 0;
}

static int
auacer_attach_codec(void *v, struct ac97_codec_if *cif)
{
        struct auacer_softc *sc;

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

static int
auacer_reset_codec(void *v)
{
        struct auacer_softc *sc;
        uint32_t reg;
        int i;

        sc = v;
        i = 0;
        reg = READ4(sc, ALI_SCR);
        if ((reg & 2) == 0)     /* Cold required */
                reg |= 2;
        else
                reg |= 1;       /* Warm */
        reg &= ~0x80000000;     /* ACLink on */
        WRITE4(sc, ALI_SCR, reg);

        while (i < 10) {
                if ((READ4(sc, ALI_INTERRUPTSR) & ALI_INT_GPIO) == 0)
                        break;
                delay(50000);   /* XXX */
                i++;
        }
        if (i == 10) {
                return EIO;
        }

        for (i = 0; i < 10; i++) {
                reg = READ4(sc, ALI_RTSR);
                if (reg & 0x80) /* primary codec */
                        break;
                WRITE4(sc, ALI_RTSR, reg | 0x80);
                delay(50000);   /* XXX */
        }

        return 0;
}

static void
auacer_reset(struct auacer_softc *sc)
{
        WRITE4(sc, ALI_SCR, ALI_SCR_RESET);
        WRITE4(sc, ALI_FIFOCR1, 0x83838383);
        WRITE4(sc, ALI_FIFOCR2, 0x83838383);
        WRITE4(sc, ALI_FIFOCR3, 0x83838383);
        WRITE4(sc, ALI_INTERFACECR, ALI_IF_PO); /* XXX pcm out only */
        WRITE4(sc, ALI_INTERRUPTCR, 0x00000000);
        WRITE4(sc, ALI_INTERRUPTSR, 0x00000000);
}

static int
auacer_query_format(void *v, audio_format_query_t *afp)
{
        struct auacer_softc *sc;

        DPRINTF(ALI_DEBUG_API, ("%s\n", __func__));
        sc = v;
        return audio_query_format(sc->sc_formats, AUACER_NFORMATS, afp);
}

static int
auacer_set_rate(struct auacer_softc *sc, int mode, u_int srate)
{
        int ret;
        u_int ratetmp;

        DPRINTF(ALI_DEBUG_API, ("auacer_set_rate: srate=%u\n", srate));

        ratetmp = srate;
        if (mode == AUMODE_RECORD)
                return sc->codec_if->vtbl->set_rate(sc->codec_if,
                    AC97_REG_PCM_LR_ADC_RATE, &ratetmp);
        ret = sc->codec_if->vtbl->set_rate(sc->codec_if,
            AC97_REG_PCM_FRONT_DAC_RATE, &ratetmp);
        if (ret)
                return ret;
        ratetmp = srate;
        ret = sc->codec_if->vtbl->set_rate(sc->codec_if,
            AC97_REG_PCM_SURR_DAC_RATE, &ratetmp);
        if (ret)
                return ret;
        ratetmp = srate;
        ret = sc->codec_if->vtbl->set_rate(sc->codec_if,
            AC97_REG_PCM_LFE_DAC_RATE, &ratetmp);
        return ret;
}

static int
auacer_set_format(void *v, int setmode,
    const audio_params_t *play, const audio_params_t *rec,
    audio_filter_reg_t *pfil, audio_filter_reg_t *rfil)
{
        struct auacer_softc *sc;
        const audio_params_t *p;
        uint32_t control;
        int mode, index;

        DPRINTF(ALI_DEBUG_API, ("%s\n", __func__));
        sc = v;
        for (mode = AUMODE_RECORD; mode != -1;
             mode = mode == AUMODE_RECORD ? AUMODE_PLAY : -1) {
                if ((setmode & mode) == 0)
                        continue;

                p = mode == AUMODE_PLAY ? play : rec;

                index = audio_indexof_format(sc->sc_formats, AUACER_NFORMATS,
                    mode, p);
                /* p points HW encoding */
                if (sc->sc_formats[index].frequency_type != 1
                    && auacer_set_rate(sc, mode, p->sample_rate))
                        return EINVAL;
                if (mode == AUMODE_PLAY) {
                        control = READ4(sc, ALI_SCR);
                        control &= ~ALI_SCR_PCM_246_MASK;
                        if (p->channels == 4)
                                control |= ALI_SCR_PCM_4;
                        else if (p->channels == 6)
                                control |= ALI_SCR_PCM_6;
                        WRITE4(sc, ALI_SCR, control);
                }
        }

        return 0;
}

static void
auacer_halt(struct auacer_softc *sc, struct auacer_chan *chan)
{
        uint32_t val;
        uint8_t port;
        uint32_t slot;

        port = chan->port;
        DPRINTF(ALI_DEBUG_API, ("auacer_halt: port=0x%x\n", port));
        chan->intr = 0;

        slot = ALI_PORT2SLOT(port);

        val = READ4(sc, ALI_DMACR);
        val |= 1 << (slot+16); /* pause */
        val &= ~(1 << slot); /* no start */
        WRITE4(sc, ALI_DMACR, val);
        WRITE1(sc, port + ALI_OFF_CR, 0);
        while (READ1(sc, port + ALI_OFF_CR))
                ;
        /* reset whole DMA things */
        WRITE1(sc, port + ALI_OFF_CR, ALI_CR_RR);
        /* clear interrupts */
        WRITE1(sc, port + ALI_OFF_SR, READ1(sc, port+ALI_OFF_SR) | ALI_SR_W1TC);
        WRITE4(sc, ALI_INTERRUPTSR, ALI_PORT2INTR(port));
}

static int
auacer_halt_output(void *v)
{
        struct auacer_softc *sc;

        DPRINTF(ALI_DEBUG_DMA, ("auacer_halt_output\n"));
        sc = v;
        auacer_halt(sc, &sc->sc_pcmo);

        return 0;
}

static int
auacer_halt_input(void *v)
{
        DPRINTF(ALI_DEBUG_DMA, ("auacer_halt_input\n"));

        return 0;
}

static int
auacer_getdev(void *v, struct audio_device *adp)
{
        struct auacer_softc *sc;

        DPRINTF(ALI_DEBUG_API, ("auacer_getdev\n"));
        sc = v;
        *adp = sc->sc_audev;
        return 0;
}

static int
auacer_set_port(void *v, mixer_ctrl_t *cp)
{
        struct auacer_softc *sc;

        DPRINTF(ALI_DEBUG_MIXERAPI, ("auacer_set_port\n"));
        sc = v;
        return sc->codec_if->vtbl->mixer_set_port(sc->codec_if, cp);
}

static int
auacer_get_port(void *v, mixer_ctrl_t *cp)
{
        struct auacer_softc *sc;

        DPRINTF(ALI_DEBUG_MIXERAPI, ("auacer_get_port\n"));
        sc = v;
        return sc->codec_if->vtbl->mixer_get_port(sc->codec_if, cp);
}

static int
auacer_query_devinfo(void *v, mixer_devinfo_t *dp)
{
        struct auacer_softc *sc;

        DPRINTF(ALI_DEBUG_MIXERAPI, ("auacer_query_devinfo\n"));
        sc = v;
        return sc->codec_if->vtbl->query_devinfo(sc->codec_if, dp);
}

static void *
auacer_allocm(void *v, int direction, size_t size)
{
        struct auacer_softc *sc;
        struct auacer_dma *p;
        int error;

        if (size > (ALI_DMALIST_MAX * ALI_DMASEG_MAX))
                return NULL;

        p = kmem_zalloc(sizeof(*p), KM_SLEEP);
        sc = v;
        error = auacer_allocmem(sc, size, 0, p);
        if (error) {
                kmem_free(p, sizeof(*p));
                return NULL;
        }

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

        return KERNADDR(p);
}

static void
auacer_freem(void *v, void *ptr, size_t size)
{
        struct auacer_softc *sc;
        struct auacer_dma *p, **pp;

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

static size_t
auacer_round_buffersize(void *v, int direction, size_t size)
{

        if (size > (ALI_DMALIST_MAX * ALI_DMASEG_MAX))
                size = ALI_DMALIST_MAX * ALI_DMASEG_MAX;

        return size;
}

static int
auacer_get_props(void *v)
{

        return AUDIO_PROP_PLAYBACK | AUDIO_PROP_CAPTURE |
            AUDIO_PROP_INDEPENDENT | AUDIO_PROP_FULLDUPLEX;
}

static void
auacer_get_locks(void *v, kmutex_t **intr, kmutex_t **proc)
{
        struct auacer_softc *sc;

        sc = v;
        *intr = &sc->sc_intr_lock;
        *proc = &sc->sc_lock;
}

static void
auacer_add_entry(struct auacer_chan *chan)
{
        struct auacer_dmalist *q;

        q = &chan->dmalist[chan->ptr];

        DPRINTF(ALI_DEBUG_INTR,
                ("auacer_add_entry: %p = %x @ 0x%x\n",
                 q, chan->blksize / 2, chan->p));

        q->base = htole32(chan->p);
        q->len = htole32((chan->blksize / ALI_SAMPLE_SIZE) | ALI_DMAF_IOC);
        chan->p += chan->blksize;
        if (chan->p >= chan->end)
                chan->p = chan->start;

        if (++chan->ptr >= ALI_DMALIST_MAX)
                chan->ptr = 0;
}

static void
auacer_upd_chan(struct auacer_softc *sc, struct auacer_chan *chan)
{
        uint32_t sts;
        uint32_t civ;

        sts = READ2(sc, chan->port + ALI_OFF_SR);
        /* intr ack */
        WRITE2(sc, chan->port + ALI_OFF_SR, sts & ALI_SR_W1TC);
        WRITE4(sc, ALI_INTERRUPTSR, ALI_PORT2INTR(chan->port));

        DPRINTF(ALI_DEBUG_INTR, ("auacer_upd_chan: sts=0x%x\n", sts));

        if (sts & ALI_SR_DMA_INT_FIFO) {
                printf("%s: fifo underrun # %u\n",
                       device_xname(sc->sc_dev), ++chan->fifoe);
        }

        civ = READ1(sc, chan->port + ALI_OFF_CIV);

        DPRINTF(ALI_DEBUG_INTR,("auacer_intr: civ=%u ptr=%u\n",civ,chan->ptr));

        /* XXX */
        while (chan->ptr != civ) {
                auacer_add_entry(chan);
        }

        WRITE1(sc, chan->port + ALI_OFF_LVI, (chan->ptr - 1) & ALI_LVI_MASK);

        while (chan->ack != civ) {
                if (chan->intr) {
                        DPRINTF(ALI_DEBUG_INTR,("auacer_upd_chan: callback\n"));
                        chan->intr(chan->arg);
                }
                chan->ack++;
                if (chan->ack >= ALI_DMALIST_MAX)
                        chan->ack = 0;
        }
}

static int
auacer_intr(void *v)
{
        struct auacer_softc *sc;
        int ret, intrs;

        sc = v;

        DPRINTF(ALI_DEBUG_INTR, ("auacer_intr: intrs=0x%x\n",
            READ4(sc, ALI_INTERRUPTSR)));

        mutex_spin_enter(&sc->sc_intr_lock);
        intrs = READ4(sc, ALI_INTERRUPTSR);
        ret = 0;
        if (intrs & ALI_INT_PCMOUT) {
                auacer_upd_chan(sc, &sc->sc_pcmo);
                ret++;
        }
        mutex_spin_exit(&sc->sc_intr_lock);

        return ret != 0;
}

static void
auacer_setup_chan(struct auacer_softc *sc, struct auacer_chan *chan,
                  uint32_t start, uint32_t size, uint32_t blksize,
                  void (*intr)(void *), void *arg)
{
        uint32_t port, slot;
        uint32_t offs, val;

        chan->start = start;
        chan->ptr = 0;
        chan->p = chan->start;
        chan->end = chan->start + size;
        chan->blksize = blksize;
        chan->ack = 0;
        chan->intr = intr;
        chan->arg = arg;

        auacer_add_entry(chan);
        auacer_add_entry(chan);

        port = chan->port;
        slot = ALI_PORT2SLOT(port);

        WRITE1(sc, port + ALI_OFF_CIV, 0);
        WRITE1(sc, port + ALI_OFF_LVI, (chan->ptr - 1) & ALI_LVI_MASK);
        offs = (char *)chan->dmalist - (char *)sc->sc_cdata;
        WRITE4(sc, port + ALI_OFF_BDBAR, sc->sc_cddma + offs);
        WRITE1(sc, port + ALI_OFF_CR,
               ALI_CR_IOCE | ALI_CR_FEIE | ALI_CR_LVBIE | ALI_CR_RPBM);
        val = READ4(sc, ALI_DMACR);
        val &= ~(1 << (slot+16)); /* no pause */
        val |= 1 << slot;       /* start */
        WRITE4(sc, ALI_DMACR, val);
}

static int
auacer_trigger_output(void *v, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, const audio_params_t *param)
{
        struct auacer_softc *sc;
        struct auacer_dma *p;
        uint32_t size;

        DPRINTF(ALI_DEBUG_DMA,
                ("auacer_trigger_output(%p, %p, %d, %p, %p, %p)\n",
                 start, end, blksize, intr, arg, param));
        sc = v;
        for (p = sc->sc_dmas; p && KERNADDR(p) != start; p = p->next)
                continue;
        if (!p) {
                printf("auacer_trigger_output: bad addr %p\n", start);
                return (EINVAL);
        }

        size = (char *)end - (char *)start;
        auacer_setup_chan(sc, &sc->sc_pcmo, DMAADDR(p), size, blksize,
                          intr, arg);

        return 0;
}

static int
auacer_trigger_input(void *v, void *start, void *end,
    int blksize, void (*intr)(void *), void *arg,
    const audio_params_t *param)
{
        return EINVAL;
}

static int
auacer_allocmem(struct auacer_softc *sc, size_t size, size_t align,
    struct auacer_dma *p)
{
        int error;

        p->size = size;
        error = bus_dmamem_alloc(sc->dmat, p->size, align, 0,
                                 p->segs, sizeof(p->segs)/sizeof(p->segs[0]),
                                 &p->nsegs, BUS_DMA_WAITOK);
        if (error)
                return error;

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

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

        error = bus_dmamap_load(sc->dmat, p->map, p->addr, p->size, NULL,
                                BUS_DMA_WAITOK);
        if (error)
                goto destroy;
        return (0);

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

static int
auacer_freemem(struct auacer_softc *sc, struct auacer_dma *p)
{

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

static int
auacer_alloc_cdata(struct auacer_softc *sc)
{
        bus_dma_segment_t seg;
        int error, rseg;

        /*
         * Allocate the control data structure, and create and load the
         * DMA map for it.
         */
        if ((error = bus_dmamem_alloc(sc->dmat,
                                      sizeof(struct auacer_cdata),
                                      PAGE_SIZE, 0, &seg, 1, &rseg, 0)) != 0) {
                aprint_error_dev(sc->sc_dev, "unable to allocate control data, error = %d\n",
                    error);
                goto fail_0;
        }

        if ((error = bus_dmamem_map(sc->dmat, &seg, rseg,
                                    sizeof(struct auacer_cdata),
                                    (void **) &sc->sc_cdata,
                                    sc->sc_dmamap_flags)) != 0) {
                aprint_error_dev(sc->sc_dev, "unable to map control data, error = %d\n",
                    error);
                goto fail_1;
        }

        if ((error = bus_dmamap_create(sc->dmat, sizeof(struct auacer_cdata), 1,
                                       sizeof(struct auacer_cdata), 0, 0,
                                       &sc->sc_cddmamap)) != 0) {
                aprint_error_dev(sc->sc_dev, "unable to create control data DMA map, "
                    "error = %d\n", error);
                goto fail_2;
        }

        if ((error = bus_dmamap_load(sc->dmat, sc->sc_cddmamap,
                                     sc->sc_cdata, sizeof(struct auacer_cdata),
                                     NULL, 0)) != 0) {
                aprint_error_dev(sc->sc_dev, "unable to load control data DMA map, "
                    "error = %d\n", error);
                goto fail_3;
        }

        return 0;

 fail_3:
        bus_dmamap_destroy(sc->dmat, sc->sc_cddmamap);
 fail_2:
        bus_dmamem_unmap(sc->dmat, (void *) sc->sc_cdata,
            sizeof(struct auacer_cdata));
 fail_1:
        bus_dmamem_free(sc->dmat, &seg, rseg);
 fail_0:
        return error;
}

static bool
auacer_resume(device_t dv, const pmf_qual_t *qual)
{
        struct auacer_softc *sc = device_private(dv);

        mutex_enter(&sc->sc_lock);
        mutex_spin_enter(&sc->sc_intr_lock);
        auacer_reset_codec(sc);
        mutex_spin_exit(&sc->sc_intr_lock);
        delay(1000);
        sc->codec_if->vtbl->restore_ports(sc->codec_if);
        mutex_exit(&sc->sc_lock);

        return true;
}