xref: /src/sys/dev/pci/eso.c

/*	$NetBSD: eso.c,v 1.57 2009/11/26 15:17:09 njoly Exp $	*/

/*
 * Copyright (c) 1999, 2000, 2004 Klaus J. Klein
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/*
 * ESS Technology Inc. Solo-1 PCI AudioDrive (ES1938/1946) device driver.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: eso.c,v 1.57 2009/11/26 15:17:09 njoly Exp $");

#include "mpu.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/queue.h>
#include <sys/proc.h>

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

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

#include <dev/mulaw.h>
#include <dev/auconv.h>

#include <dev/ic/mpuvar.h>
#include <dev/ic/i8237reg.h>
#include <dev/pci/esoreg.h>
#include <dev/pci/esovar.h>

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

/*
 * XXX Work around the 24-bit implementation limit of the Audio 1 DMA
 * XXX engine by allocating through the ISA DMA tag.
 */
#if defined(amd64) || defined(i386)
#include "isa.h"
#if NISA > 0
#include <dev/isa/isavar.h>
#endif
#endif

#if defined(AUDIO_DEBUG) || defined(DEBUG)
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif

struct eso_dma {
	bus_dma_tag_t		ed_dmat;
	bus_dmamap_t		ed_map;
	void *			ed_kva;
	bus_dma_segment_t	ed_segs[1];
	int			ed_nsegs;
	size_t			ed_size;
	SLIST_ENTRY(eso_dma)	ed_slist;
};

#define KVADDR(dma)	((void *)(dma)->ed_kva)
#define DMAADDR(dma)	((dma)->ed_map->dm_segs[0].ds_addr)

/* Autoconfiguration interface */
static int eso_match(device_t, cfdata_t, void *);
static void eso_attach(device_t, device_t, void *);
static void eso_defer(device_t);
static int eso_print(void *, const char *);

CFATTACH_DECL(eso, sizeof (struct eso_softc),
    eso_match, eso_attach, NULL, NULL);

/* PCI interface */
static int eso_intr(void *);

/* MI audio layer interface */
static int	eso_query_encoding(void *, struct audio_encoding *);
static int	eso_set_params(void *, int, int, audio_params_t *,
		    audio_params_t *, stream_filter_list_t *,
		    stream_filter_list_t *);
static int	eso_round_blocksize(void *, int, int, const audio_params_t *);
static int	eso_halt_output(void *);
static int	eso_halt_input(void *);
static int	eso_getdev(void *, struct audio_device *);
static int	eso_set_port(void *, mixer_ctrl_t *);
static int	eso_get_port(void *, mixer_ctrl_t *);
static int	eso_query_devinfo(void *, mixer_devinfo_t *);
static void *	eso_allocm(void *, int, size_t, struct malloc_type *, int);
static void	eso_freem(void *, void *, struct malloc_type *);
static size_t	eso_round_buffersize(void *, int, size_t);
static paddr_t	eso_mappage(void *, void *, off_t, int);
static int	eso_get_props(void *);
static int	eso_trigger_output(void *, void *, void *, int,
		    void (*)(void *), void *, const audio_params_t *);
static int	eso_trigger_input(void *, void *, void *, int,
		    void (*)(void *), void *, const audio_params_t *);

static const struct audio_hw_if eso_hw_if = {
	NULL,			/* open */
	NULL,			/* close */
	NULL,			/* drain */
	eso_query_encoding,
	eso_set_params,
	eso_round_blocksize,
	NULL,			/* commit_settings */
	NULL,			/* init_output */
	NULL,			/* init_input */
	NULL,			/* start_output */
	NULL,			/* start_input */
	eso_halt_output,
	eso_halt_input,
	NULL,			/* speaker_ctl */
	eso_getdev,
	NULL,			/* setfd */
	eso_set_port,
	eso_get_port,
	eso_query_devinfo,
	eso_allocm,
	eso_freem,
	eso_round_buffersize,
	eso_mappage,
	eso_get_props,
	eso_trigger_output,
	eso_trigger_input,
	NULL,			/* dev_ioctl */
	NULL,			/* powerstate */
};

static const char * const eso_rev2model[] = {
	"ES1938",
	"ES1946",
	"ES1946 Revision E"
};

#define ESO_NFORMATS	8
static const struct audio_format eso_formats[ESO_NFORMATS] = {
	{NULL, AUMODE_PLAY | AUMODE_RECORD, AUDIO_ENCODING_SLINEAR_LE, 16, 16,
	 2, AUFMT_STEREO, 0, {ESO_MINRATE, ESO_MAXRATE}},
	{NULL, AUMODE_PLAY | AUMODE_RECORD, AUDIO_ENCODING_SLINEAR_LE, 16, 16,
	 1, AUFMT_MONAURAL, 0, {ESO_MINRATE, ESO_MAXRATE}},
	{NULL, AUMODE_PLAY | AUMODE_RECORD, AUDIO_ENCODING_ULINEAR_LE, 16, 16,
	 2, AUFMT_STEREO, 0, {ESO_MINRATE, ESO_MAXRATE}},
	{NULL, AUMODE_PLAY | AUMODE_RECORD, AUDIO_ENCODING_ULINEAR_LE, 16, 16,
	 1, AUFMT_MONAURAL, 0, {ESO_MINRATE, ESO_MAXRATE}},
	{NULL, AUMODE_PLAY | AUMODE_RECORD, AUDIO_ENCODING_SLINEAR_LE, 8, 8,
	 2, AUFMT_STEREO, 0, {ESO_MINRATE, ESO_MAXRATE}},
	{NULL, AUMODE_PLAY | AUMODE_RECORD, AUDIO_ENCODING_SLINEAR_LE, 8, 8,
	 1, AUFMT_MONAURAL, 0, {ESO_MINRATE, ESO_MAXRATE}},
	{NULL, AUMODE_PLAY | AUMODE_RECORD, AUDIO_ENCODING_ULINEAR_LE, 8, 8,
	 2, AUFMT_STEREO, 0, {ESO_MINRATE, ESO_MAXRATE}},
	{NULL, AUMODE_PLAY | AUMODE_RECORD, AUDIO_ENCODING_ULINEAR_LE, 8, 8,
	 1, AUFMT_MONAURAL, 0, {ESO_MINRATE, ESO_MAXRATE}}
};


/*
 * Utility routines
 */
/* Register access etc. */
static uint8_t	eso_read_ctlreg(struct eso_softc *, uint8_t);
static uint8_t	eso_read_mixreg(struct eso_softc *, uint8_t);
static uint8_t	eso_read_rdr(struct eso_softc *);
static void	eso_reload_master_vol(struct eso_softc *);
static int	eso_reset(struct eso_softc *);
static void	eso_set_gain(struct eso_softc *, unsigned int);
static int	eso_set_recsrc(struct eso_softc *, unsigned int);
static int	eso_set_monooutsrc(struct eso_softc *, unsigned int);
static int	eso_set_monoinbypass(struct eso_softc *, unsigned int);
static int	eso_set_preamp(struct eso_softc *, unsigned int);
static void	eso_write_cmd(struct eso_softc *, uint8_t);
static void	eso_write_ctlreg(struct eso_softc *, uint8_t, uint8_t);
static void	eso_write_mixreg(struct eso_softc *, uint8_t, uint8_t);
/* DMA memory allocation */
static int	eso_allocmem(struct eso_softc *, size_t, size_t, size_t,
		    int, int, struct eso_dma *);
static void	eso_freemem(struct eso_dma *);
static struct eso_dma *	eso_kva2dma(const struct eso_softc *, const void *);


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

	pa = aux;
	if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_ESSTECH &&
	    PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_ESSTECH_SOLO1)
		return 1;

	return 0;
}

static void
eso_attach(device_t parent, device_t self, void *aux)
{
	struct eso_softc *sc;
	struct pci_attach_args *pa;
	struct audio_attach_args aa;
	pci_intr_handle_t ih;
	bus_addr_t vcbase;
	const char *intrstring;
	int idx;
	uint8_t a2mode, mvctl;

	sc = device_private(self);
	pa = aux;
	aprint_naive(": Audio controller\n");

	sc->sc_revision = PCI_REVISION(pa->pa_class);

	aprint_normal(": ESS Solo-1 PCI AudioDrive ");
	if (sc->sc_revision <
	    sizeof (eso_rev2model) / sizeof (eso_rev2model[0]))
		aprint_normal("%s\n", eso_rev2model[sc->sc_revision]);
	else
		aprint_normal("(unknown rev. 0x%02x)\n", sc->sc_revision);

	/* Map I/O registers. */
	if (pci_mapreg_map(pa, ESO_PCI_BAR_IO, PCI_MAPREG_TYPE_IO, 0,
	    &sc->sc_iot, &sc->sc_ioh, NULL, NULL)) {
		aprint_error_dev(&sc->sc_dev, "can't map I/O space\n");
		return;
	}
	if (pci_mapreg_map(pa, ESO_PCI_BAR_SB, PCI_MAPREG_TYPE_IO, 0,
	    &sc->sc_sb_iot, &sc->sc_sb_ioh, NULL, NULL)) {
		aprint_error_dev(&sc->sc_dev, "can't map SB I/O space\n");
		return;
	}
	if (pci_mapreg_map(pa, ESO_PCI_BAR_VC, PCI_MAPREG_TYPE_IO, 0,
	    &sc->sc_dmac_iot, &sc->sc_dmac_ioh, &vcbase, &sc->sc_vcsize)) {
		aprint_error_dev(&sc->sc_dev, "can't map VC I/O space\n");
		/* Don't bail out yet: we can map it later, see below. */
		vcbase = 0;
		sc->sc_vcsize = 0x10; /* From the data sheet. */
	}
	if (pci_mapreg_map(pa, ESO_PCI_BAR_MPU, PCI_MAPREG_TYPE_IO, 0,
	    &sc->sc_mpu_iot, &sc->sc_mpu_ioh, NULL, NULL)) {
		aprint_error_dev(&sc->sc_dev, "can't map MPU I/O space\n");
		return;
	}
	if (pci_mapreg_map(pa, ESO_PCI_BAR_GAME, PCI_MAPREG_TYPE_IO, 0,
	    &sc->sc_game_iot, &sc->sc_game_ioh, NULL, NULL)) {
		aprint_error_dev(&sc->sc_dev, "can't map Game I/O space\n");
		return;
	}

	sc->sc_dmat = pa->pa_dmat;
	SLIST_INIT(&sc->sc_dmas);
	sc->sc_dmac_configured = 0;

	/* Enable bus mastering. */
	pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
	    pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG) |
	    PCI_COMMAND_MASTER_ENABLE);

	/* Reset the device; bail out upon failure. */
	if (eso_reset(sc) != 0) {
		aprint_error_dev(&sc->sc_dev, "can't reset\n");
		return;
	}

	/* Select the DMA/IRQ policy: DDMA, ISA IRQ emulation disabled. */
	pci_conf_write(pa->pa_pc, pa->pa_tag, ESO_PCI_S1C,
	    pci_conf_read(pa->pa_pc, pa->pa_tag, ESO_PCI_S1C) &
	    ~(ESO_PCI_S1C_IRQP_MASK | ESO_PCI_S1C_DMAP_MASK));

	/* Enable the relevant (DMA) interrupts. */
	bus_space_write_1(sc->sc_iot, sc->sc_ioh, ESO_IO_IRQCTL,
	    ESO_IO_IRQCTL_A1IRQ | ESO_IO_IRQCTL_A2IRQ | ESO_IO_IRQCTL_HVIRQ |
	    ESO_IO_IRQCTL_MPUIRQ);

	/* Set up A1's sample rate generator for new-style parameters. */
	a2mode = eso_read_mixreg(sc, ESO_MIXREG_A2MODE);
	a2mode |= ESO_MIXREG_A2MODE_NEWA1 | ESO_MIXREG_A2MODE_ASYNC;
	eso_write_mixreg(sc, ESO_MIXREG_A2MODE, a2mode);

	/* Slave Master Volume to Hardware Volume Control Counter, unmask IRQ.*/
	mvctl = eso_read_mixreg(sc, ESO_MIXREG_MVCTL);
	mvctl &= ~ESO_MIXREG_MVCTL_SPLIT;
	mvctl |= ESO_MIXREG_MVCTL_HVIRQM;
	eso_write_mixreg(sc, ESO_MIXREG_MVCTL, mvctl);

	/* Set mixer regs to something reasonable, needs work. */
	sc->sc_recmon = sc->sc_spatializer = sc->sc_mvmute = 0;
	eso_set_monooutsrc(sc, ESO_MIXREG_MPM_MOMUTE);
	eso_set_monoinbypass(sc, 0);
	eso_set_preamp(sc, 1);
	for (idx = 0; idx < ESO_NGAINDEVS; idx++) {
		int v;

		switch (idx) {
		case ESO_MIC_PLAY_VOL:
		case ESO_LINE_PLAY_VOL:
		case ESO_CD_PLAY_VOL:
		case ESO_MONO_PLAY_VOL:
		case ESO_AUXB_PLAY_VOL:
		case ESO_DAC_REC_VOL:
		case ESO_LINE_REC_VOL:
		case ESO_SYNTH_REC_VOL:
		case ESO_CD_REC_VOL:
		case ESO_MONO_REC_VOL:
		case ESO_AUXB_REC_VOL:
		case ESO_SPATIALIZER:
			v = 0;
			break;
		case ESO_MASTER_VOL:
			v = ESO_GAIN_TO_6BIT(AUDIO_MAX_GAIN / 2);
			break;
		default:
			v = ESO_GAIN_TO_4BIT(AUDIO_MAX_GAIN / 2);
			break;
		}
		sc->sc_gain[idx][ESO_LEFT] = sc->sc_gain[idx][ESO_RIGHT] = v;
		eso_set_gain(sc, idx);
	}
	eso_set_recsrc(sc, ESO_MIXREG_ERS_MIC);

	/* Map and establish the interrupt. */
	if (pci_intr_map(pa, &ih)) {
		aprint_error_dev(&sc->sc_dev, "couldn't map interrupt\n");
		return;
	}
	intrstring = pci_intr_string(pa->pa_pc, ih);
	sc->sc_ih  = pci_intr_establish(pa->pa_pc, ih, IPL_AUDIO, eso_intr, sc);
	if (sc->sc_ih == NULL) {
		aprint_error_dev(&sc->sc_dev, "couldn't establish interrupt");
		if (intrstring != NULL)
			aprint_error(" at %s", intrstring);
		aprint_error("\n");
		return;
	}
	aprint_normal_dev(&sc->sc_dev, "interrupting at %s\n",
	    intrstring);

	/*
	 * Set up the DDMA Control register; a suitable I/O region has been
	 * supposedly mapped in the VC base address register.
	 *
	 * The Solo-1 has an ... interesting silicon bug that causes it to
	 * not respond to I/O space accesses to the Audio 1 DMA controller
	 * if the latter's mapping base address is aligned on a 1K boundary.
	 * As a consequence, it is quite possible for the mapping provided
	 * in the VC BAR to be useless.  To work around this, we defer this
	 * part until all autoconfiguration on our parent bus is completed
	 * and then try to map it ourselves in fulfillment of the constraint.
	 *
	 * According to the register map we may write to the low 16 bits
	 * only, but experimenting has shown we're safe.
	 * -kjk
	 */
	if (ESO_VALID_DDMAC_BASE(vcbase)) {
		pci_conf_write(pa->pa_pc, pa->pa_tag, ESO_PCI_DDMAC,
		    vcbase | ESO_PCI_DDMAC_DE);
		sc->sc_dmac_configured = 1;

		aprint_normal_dev(&sc->sc_dev,
		    "mapping Audio 1 DMA using VC I/O space at 0x%lx\n",
		    (unsigned long)vcbase);
	} else {
		DPRINTF(("%s: VC I/O space at 0x%lx not suitable, deferring\n",
		    device_xname(&sc->sc_dev), (unsigned long)vcbase));
		sc->sc_pa = *pa;
		config_defer(self, eso_defer);
	}

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

	aa.type = AUDIODEV_TYPE_OPL;
	aa.hwif = NULL;
	aa.hdl = NULL;
	(void)config_found(&sc->sc_dev, &aa, audioprint);

	aa.type = AUDIODEV_TYPE_MPU;
	aa.hwif = NULL;
	aa.hdl = NULL;
	sc->sc_mpudev = config_found(&sc->sc_dev, &aa, audioprint);
	if (sc->sc_mpudev != NULL) {
		/* Unmask the MPU irq. */
		mvctl = eso_read_mixreg(sc, ESO_MIXREG_MVCTL);
		mvctl |= ESO_MIXREG_MVCTL_MPUIRQM;
		eso_write_mixreg(sc, ESO_MIXREG_MVCTL, mvctl);
	}

	aa.type = AUDIODEV_TYPE_AUX;
	aa.hwif = NULL;
	aa.hdl = NULL;
	(void)config_found(&sc->sc_dev, &aa, eso_print);
}

static void
eso_defer(device_t self)
{
	struct eso_softc *sc;
	struct pci_attach_args *pa;
	bus_addr_t addr, start;

	sc = device_private(self);
	pa = &sc->sc_pa;
	aprint_normal_dev(&sc->sc_dev, "");

	/*
	 * This is outright ugly, but since we must not make assumptions
	 * on the underlying allocator's behaviour it's the most straight-
	 * forward way to implement it.  Note that we skip over the first
	 * 1K region, which is typically occupied by an attached ISA bus.
	 */
	for (start = 0x0400; start < 0xffff; start += 0x0400) {
		if (bus_space_alloc(sc->sc_iot,
		    start + sc->sc_vcsize, start + 0x0400 - 1,
		    sc->sc_vcsize, sc->sc_vcsize, 0, 0, &addr,
		    &sc->sc_dmac_ioh) != 0)
			continue;

		pci_conf_write(pa->pa_pc, pa->pa_tag, ESO_PCI_DDMAC,
		    addr | ESO_PCI_DDMAC_DE);
		sc->sc_dmac_iot = sc->sc_iot;
		sc->sc_dmac_configured = 1;
		aprint_normal("mapping Audio 1 DMA using I/O space at 0x%lx\n",
		    (unsigned long)addr);

		return;
	}

	aprint_error("can't map Audio 1 DMA into I/O space\n");
}

/* ARGSUSED */
static int
eso_print(void *aux, const char *pnp)
{

	/* Only joys can attach via this; easy. */
	if (pnp)
		aprint_normal("joy at %s:", pnp);

	return UNCONF;
}

static void
eso_write_cmd(struct eso_softc *sc, uint8_t cmd)
{
	int i;

	/* Poll for busy indicator to become clear. */
	for (i = 0; i < ESO_WDR_TIMEOUT; i++) {
		if ((bus_space_read_1(sc->sc_sb_iot, sc->sc_sb_ioh, ESO_SB_RSR)
		    & ESO_SB_RSR_BUSY) == 0) {
			bus_space_write_1(sc->sc_sb_iot, sc->sc_sb_ioh,
			    ESO_SB_WDR, cmd);
			return;
		} else {
			delay(10);
		}
	}

	printf("%s: WDR timeout\n", device_xname(&sc->sc_dev));
	return;
}

/* Write to a controller register */
static void
eso_write_ctlreg(struct eso_softc *sc, uint8_t reg, uint8_t val)
{

	/* DPRINTF(("ctlreg 0x%02x = 0x%02x\n", reg, val)); */

	eso_write_cmd(sc, reg);
	eso_write_cmd(sc, val);
}

/* Read out the Read Data Register */
static uint8_t
eso_read_rdr(struct eso_softc *sc)
{
	int i;

	for (i = 0; i < ESO_RDR_TIMEOUT; i++) {
		if (bus_space_read_1(sc->sc_sb_iot, sc->sc_sb_ioh,
		    ESO_SB_RBSR) & ESO_SB_RBSR_RDAV) {
			return (bus_space_read_1(sc->sc_sb_iot,
			    sc->sc_sb_ioh, ESO_SB_RDR));
		} else {
			delay(10);
		}
	}

	printf("%s: RDR timeout\n", device_xname(&sc->sc_dev));
	return (-1);
}

static uint8_t
eso_read_ctlreg(struct eso_softc *sc, uint8_t reg)
{

	eso_write_cmd(sc, ESO_CMD_RCR);
	eso_write_cmd(sc, reg);
	return eso_read_rdr(sc);
}

static void
eso_write_mixreg(struct eso_softc *sc, uint8_t reg, uint8_t val)
{
	int s;

	/* DPRINTF(("mixreg 0x%02x = 0x%02x\n", reg, val)); */

	s = splaudio();
	bus_space_write_1(sc->sc_sb_iot, sc->sc_sb_ioh, ESO_SB_MIXERADDR, reg);
	bus_space_write_1(sc->sc_sb_iot, sc->sc_sb_ioh, ESO_SB_MIXERDATA, val);
	splx(s);
}

static uint8_t
eso_read_mixreg(struct eso_softc *sc, uint8_t reg)
{
	int s;
	uint8_t val;

	s = splaudio();
	bus_space_write_1(sc->sc_sb_iot, sc->sc_sb_ioh, ESO_SB_MIXERADDR, reg);
	val = bus_space_read_1(sc->sc_sb_iot, sc->sc_sb_ioh, ESO_SB_MIXERDATA);
	splx(s);

	return val;
}

static int
eso_intr(void *hdl)
{
	struct eso_softc *sc = hdl;
#if NMPU > 0
	struct mpu_softc *sc_mpu = device_private(sc->sc_mpudev);
#endif
	uint8_t irqctl;

	irqctl = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ESO_IO_IRQCTL);

	/* If it wasn't ours, that's all she wrote. */
	if ((irqctl & (ESO_IO_IRQCTL_A1IRQ | ESO_IO_IRQCTL_A2IRQ |
	    ESO_IO_IRQCTL_HVIRQ | ESO_IO_IRQCTL_MPUIRQ)) == 0)
		return 0;

	if (irqctl & ESO_IO_IRQCTL_A1IRQ) {
		/* Clear interrupt. */
		(void)bus_space_read_1(sc->sc_sb_iot, sc->sc_sb_ioh,
		    ESO_SB_RBSR);

		if (sc->sc_rintr)
			sc->sc_rintr(sc->sc_rarg);
		else
			wakeup(&sc->sc_rintr);
	}

	if (irqctl & ESO_IO_IRQCTL_A2IRQ) {
		/*
		 * Clear the A2 IRQ latch: the cached value reflects the
		 * current DAC settings with the IRQ latch bit not set.
		 */
		eso_write_mixreg(sc, ESO_MIXREG_A2C2, sc->sc_a2c2);

		if (sc->sc_pintr)
			sc->sc_pintr(sc->sc_parg);
		else
			wakeup(&sc->sc_pintr);
	}

	if (irqctl & ESO_IO_IRQCTL_HVIRQ) {
		/* Clear interrupt. */
		eso_write_mixreg(sc, ESO_MIXREG_CHVIR, ESO_MIXREG_CHVIR_CHVIR);

		/*
		 * Raise a flag to cause a lazy update of the in-softc gain
		 * values the next time the software mixer is read to keep
		 * interrupt service cost low.  ~0 cannot occur otherwise
		 * as the master volume has a precision of 6 bits only.
		 */
		sc->sc_gain[ESO_MASTER_VOL][ESO_LEFT] = (uint8_t)~0;
	}

#if NMPU > 0
	if ((irqctl & ESO_IO_IRQCTL_MPUIRQ) && sc_mpu != NULL)
		mpu_intr(sc_mpu);
#endif

	return 1;
}

/* Perform a software reset, including DMA FIFOs. */
static int
eso_reset(struct eso_softc *sc)
{
	int i;

	bus_space_write_1(sc->sc_sb_iot, sc->sc_sb_ioh, ESO_SB_RESET,
	    ESO_SB_RESET_SW | ESO_SB_RESET_FIFO);
	/* `Delay' suggested in the data sheet. */
	(void)bus_space_read_1(sc->sc_sb_iot, sc->sc_sb_ioh, ESO_SB_STATUS);
	bus_space_write_1(sc->sc_sb_iot, sc->sc_sb_ioh, ESO_SB_RESET, 0);

	/* Wait for reset to take effect. */
	for (i = 0; i < ESO_RESET_TIMEOUT; i++) {
		/* Poll for data to become available. */
		if ((bus_space_read_1(sc->sc_sb_iot, sc->sc_sb_ioh,
		    ESO_SB_RBSR) & ESO_SB_RBSR_RDAV) != 0 &&
		    bus_space_read_1(sc->sc_sb_iot, sc->sc_sb_ioh,
			ESO_SB_RDR) == ESO_SB_RDR_RESETMAGIC) {

			/* Activate Solo-1 extension commands. */
			eso_write_cmd(sc, ESO_CMD_EXTENB);
			/* Reset mixer registers. */
			eso_write_mixreg(sc, ESO_MIXREG_RESET,
			    ESO_MIXREG_RESET_RESET);

			return 0;
		} else {
			delay(1000);
		}
	}

	printf("%s: reset timeout\n", device_xname(&sc->sc_dev));
	return -1;
}

static int
eso_query_encoding(void *hdl, struct audio_encoding *fp)
{

	switch (fp->index) {
	case 0:
		strcpy(fp->name, AudioEulinear);
		fp->encoding = AUDIO_ENCODING_ULINEAR;
		fp->precision = 8;
		fp->flags = 0;
		break;
	case 1:
		strcpy(fp->name, AudioEmulaw);
		fp->encoding = AUDIO_ENCODING_ULAW;
		fp->precision = 8;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	case 2:
		strcpy(fp->name, AudioEalaw);
		fp->encoding = AUDIO_ENCODING_ALAW;
		fp->precision = 8;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	case 3:
		strcpy(fp->name, AudioEslinear);
		fp->encoding = AUDIO_ENCODING_SLINEAR;
		fp->precision = 8;
		fp->flags = 0;
		break;
	case 4:
		strcpy(fp->name, AudioEslinear_le);
		fp->encoding = AUDIO_ENCODING_SLINEAR_LE;
		fp->precision = 16;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	case 5:
		strcpy(fp->name, AudioEulinear_le);
		fp->encoding = AUDIO_ENCODING_ULINEAR_LE;
		fp->precision = 16;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	case 6:
		strcpy(fp->name, AudioEslinear_be);
		fp->encoding = AUDIO_ENCODING_SLINEAR_BE;
		fp->precision = 16;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	case 7:
		strcpy(fp->name, AudioEulinear_be);
		fp->encoding = AUDIO_ENCODING_ULINEAR_BE;
		fp->precision = 16;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	default:
		return EINVAL;
	}

	return 0;
}

static int
eso_set_params(void *hdl, int setmode, int usemode,
    audio_params_t *play, audio_params_t *rec, stream_filter_list_t *pfil,
    stream_filter_list_t *rfil)
{
	struct eso_softc *sc;
	struct audio_params *p;
	stream_filter_list_t *fil;
	int mode, r[2], rd[2], ar[2], clk;
	unsigned int srg, fltdiv;
	int i;

	sc = hdl;
	for (mode = AUMODE_RECORD; mode != -1;
	     mode = mode == AUMODE_RECORD ? AUMODE_PLAY : -1) {
		if ((setmode & mode) == 0)
			continue;

		p = (mode == AUMODE_PLAY) ? play : rec;

		if (p->sample_rate < ESO_MINRATE ||
		    p->sample_rate > ESO_MAXRATE ||
		    (p->precision != 8 && p->precision != 16) ||
		    (p->channels != 1 && p->channels != 2))
			return EINVAL;

		/*
		 * We'll compute both possible sample rate dividers and pick
		 * the one with the least error.
		 */
#define ABS(x) ((x) < 0 ? -(x) : (x))
		r[0] = ESO_CLK0 /
		    (128 - (rd[0] = 128 - ESO_CLK0 / p->sample_rate));
		r[1] = ESO_CLK1 /
		    (128 - (rd[1] = 128 - ESO_CLK1 / p->sample_rate));

		ar[0] = p->sample_rate - r[0];
		ar[1] = p->sample_rate - r[1];
		clk = ABS(ar[0]) > ABS(ar[1]) ? 1 : 0;
		srg = rd[clk] | (clk == 1 ? ESO_CLK1_SELECT : 0x00);

		/* Roll-off frequency of 87%, as in the ES1888 driver. */
		fltdiv = 256 - 200279L / r[clk];

		/* Update to reflect the possibly inexact rate. */
		p->sample_rate = r[clk];

		fil = (mode == AUMODE_PLAY) ? pfil : rfil;
		i = auconv_set_converter(eso_formats, ESO_NFORMATS,
					 mode, p, FALSE, fil);
		if (i < 0)
			return EINVAL;
		if (mode == AUMODE_RECORD) {
			/* Audio 1 */
			DPRINTF(("A1 srg 0x%02x fdiv 0x%02x\n", srg, fltdiv));
			eso_write_ctlreg(sc, ESO_CTLREG_SRG, srg);
			eso_write_ctlreg(sc, ESO_CTLREG_FLTDIV, fltdiv);
		} else {
			/* Audio 2 */
			DPRINTF(("A2 srg 0x%02x fdiv 0x%02x\n", srg, fltdiv));
			eso_write_mixreg(sc, ESO_MIXREG_A2SRG, srg);
			eso_write_mixreg(sc, ESO_MIXREG_A2FLTDIV, fltdiv);
		}
#undef ABS

	}

	return 0;
}

static int
eso_round_blocksize(void *hdl, int blk, int mode,
    const audio_params_t *param)
{

	return blk & -32;	/* keep good alignment; at least 16 req'd */
}

static int
eso_halt_output(void *hdl)
{
	struct eso_softc *sc;
	int error, s;

	sc = hdl;
	DPRINTF(("%s: halt_output\n", device_xname(&sc->sc_dev)));

	/*
	 * Disable auto-initialize DMA, allowing the FIFO to drain and then
	 * stop.  The interrupt callback pointer is cleared at this
	 * point so that an outstanding FIFO interrupt for the remaining data
	 * will be acknowledged without further processing.
	 *
	 * This does not immediately `abort' an operation in progress (c.f.
	 * audio(9)) but is the method to leave the FIFO behind in a clean
	 * state with the least hair.  (Besides, that item needs to be
	 * rephrased for trigger_*()-based DMA environments.)
	 */
	s = splaudio();
	eso_write_mixreg(sc, ESO_MIXREG_A2C1,
	    ESO_MIXREG_A2C1_FIFOENB | ESO_MIXREG_A2C1_DMAENB);
	bus_space_write_1(sc->sc_iot, sc->sc_ioh, ESO_IO_A2DMAM,
	    ESO_IO_A2DMAM_DMAENB);

	sc->sc_pintr = NULL;
	error = tsleep(&sc->sc_pintr, PCATCH | PWAIT, "esoho", sc->sc_pdrain);
	splx(s);

	/* Shut down DMA completely. */
	eso_write_mixreg(sc, ESO_MIXREG_A2C1, 0);
	bus_space_write_1(sc->sc_iot, sc->sc_ioh, ESO_IO_A2DMAM, 0);

	return error == EWOULDBLOCK ? 0 : error;
}

static int
eso_halt_input(void *hdl)
{
	struct eso_softc *sc;
	int error, s;

	sc = hdl;
	DPRINTF(("%s: halt_input\n", device_xname(&sc->sc_dev)));

	/* Just like eso_halt_output(), but for Audio 1. */
	s = splaudio();
	eso_write_ctlreg(sc, ESO_CTLREG_A1C2,
	    ESO_CTLREG_A1C2_READ | ESO_CTLREG_A1C2_ADC |
	    ESO_CTLREG_A1C2_DMAENB);
	bus_space_write_1(sc->sc_dmac_iot, sc->sc_dmac_ioh, ESO_DMAC_MODE,
	    DMA37MD_WRITE | DMA37MD_DEMAND);

	sc->sc_rintr = NULL;
	error = tsleep(&sc->sc_rintr, PCATCH | PWAIT, "esohi", sc->sc_rdrain);
	splx(s);

	/* Shut down DMA completely. */
	eso_write_ctlreg(sc, ESO_CTLREG_A1C2,
	    ESO_CTLREG_A1C2_READ | ESO_CTLREG_A1C2_ADC);
	bus_space_write_1(sc->sc_dmac_iot, sc->sc_dmac_ioh, ESO_DMAC_MASK,
	    ESO_DMAC_MASK_MASK);

	return error == EWOULDBLOCK ? 0 : error;
}

static int
eso_getdev(void *hdl, struct audio_device *retp)
{
	struct eso_softc *sc;

	sc = hdl;
	strncpy(retp->name, "ESS Solo-1", sizeof (retp->name));
	snprintf(retp->version, sizeof (retp->version), "0x%02x",
	    sc->sc_revision);
	if (sc->sc_revision <
	    sizeof (eso_rev2model) / sizeof (eso_rev2model[0]))
		strncpy(retp->config, eso_rev2model[sc->sc_revision],
		    sizeof (retp->config));
	else
		strncpy(retp->config, "unknown", sizeof (retp->config));

	return 0;
}

static int
eso_set_port(void *hdl, mixer_ctrl_t *cp)
{
	struct eso_softc *sc;
	unsigned int lgain, rgain;
	uint8_t tmp;

	sc = hdl;
	switch (cp->dev) {
	case ESO_DAC_PLAY_VOL:
	case ESO_MIC_PLAY_VOL:
	case ESO_LINE_PLAY_VOL:
	case ESO_SYNTH_PLAY_VOL:
	case ESO_CD_PLAY_VOL:
	case ESO_AUXB_PLAY_VOL:
	case ESO_RECORD_VOL:
	case ESO_DAC_REC_VOL:
	case ESO_MIC_REC_VOL:
	case ESO_LINE_REC_VOL:
	case ESO_SYNTH_REC_VOL:
	case ESO_CD_REC_VOL:
	case ESO_AUXB_REC_VOL:
		if (cp->type != AUDIO_MIXER_VALUE)
			return EINVAL;

		/*
		 * Stereo-capable mixer ports: if we get a single-channel
		 * gain value passed in, then we duplicate it to both left
		 * and right channels.
		 */
		switch (cp->un.value.num_channels) {
		case 1:
			lgain = rgain = ESO_GAIN_TO_4BIT(
			    cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
			break;
		case 2:
			lgain = ESO_GAIN_TO_4BIT(
			    cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT]);
			rgain = ESO_GAIN_TO_4BIT(
			    cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT]);
			break;
		default:
			return EINVAL;
		}

		sc->sc_gain[cp->dev][ESO_LEFT] = lgain;
		sc->sc_gain[cp->dev][ESO_RIGHT] = rgain;
		eso_set_gain(sc, cp->dev);
		break;

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

		/* Like above, but a precision of 6 bits. */
		switch (cp->un.value.num_channels) {
		case 1:
			lgain = rgain = ESO_GAIN_TO_6BIT(
			    cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
			break;
		case 2:
			lgain = ESO_GAIN_TO_6BIT(
			    cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT]);
			rgain = ESO_GAIN_TO_6BIT(
			    cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT]);
			break;
		default:
			return EINVAL;
		}

		sc->sc_gain[cp->dev][ESO_LEFT] = lgain;
		sc->sc_gain[cp->dev][ESO_RIGHT] = rgain;
		eso_set_gain(sc, cp->dev);
		break;

	case ESO_SPATIALIZER:
		if (cp->type != AUDIO_MIXER_VALUE ||
		    cp->un.value.num_channels != 1)
			return EINVAL;

		sc->sc_gain[cp->dev][ESO_LEFT] =
		    sc->sc_gain[cp->dev][ESO_RIGHT] =
		    ESO_GAIN_TO_6BIT(
			cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
		eso_set_gain(sc, cp->dev);
		break;

	case ESO_MONO_PLAY_VOL:
	case ESO_MONO_REC_VOL:
		if (cp->type != AUDIO_MIXER_VALUE ||
		    cp->un.value.num_channels != 1)
			return EINVAL;

		sc->sc_gain[cp->dev][ESO_LEFT] =
		    sc->sc_gain[cp->dev][ESO_RIGHT] =
		    ESO_GAIN_TO_4BIT(
			cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
		eso_set_gain(sc, cp->dev);
		break;

	case ESO_PCSPEAKER_VOL:
		if (cp->type != AUDIO_MIXER_VALUE ||
		    cp->un.value.num_channels != 1)
			return EINVAL;

		sc->sc_gain[cp->dev][ESO_LEFT] =
		    sc->sc_gain[cp->dev][ESO_RIGHT] =
		    ESO_GAIN_TO_3BIT(
			cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
		eso_set_gain(sc, cp->dev);
		break;

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

		sc->sc_spatializer = (cp->un.ord != 0);

		tmp = eso_read_mixreg(sc, ESO_MIXREG_SPAT);
		if (sc->sc_spatializer)
			tmp |= ESO_MIXREG_SPAT_ENB;
		else
			tmp &= ~ESO_MIXREG_SPAT_ENB;
		eso_write_mixreg(sc, ESO_MIXREG_SPAT,
		    tmp | ESO_MIXREG_SPAT_RSTREL);
		break;

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

		sc->sc_mvmute = (cp->un.ord != 0);

		if (sc->sc_mvmute) {
			eso_write_mixreg(sc, ESO_MIXREG_LMVM,
			    eso_read_mixreg(sc, ESO_MIXREG_LMVM) |
			    ESO_MIXREG_LMVM_MUTE);
			eso_write_mixreg(sc, ESO_MIXREG_RMVM,
			    eso_read_mixreg(sc, ESO_MIXREG_RMVM) |
			    ESO_MIXREG_RMVM_MUTE);
		} else {
			eso_write_mixreg(sc, ESO_MIXREG_LMVM,
			    eso_read_mixreg(sc, ESO_MIXREG_LMVM) &
			    ~ESO_MIXREG_LMVM_MUTE);
			eso_write_mixreg(sc, ESO_MIXREG_RMVM,
			    eso_read_mixreg(sc, ESO_MIXREG_RMVM) &
			    ~ESO_MIXREG_RMVM_MUTE);
		}
		break;

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

		return eso_set_monooutsrc(sc, cp->un.ord);

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

		return (eso_set_monoinbypass(sc, cp->un.ord));

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

		sc->sc_recmon = (cp->un.ord != 0);

		tmp = eso_read_ctlreg(sc, ESO_CTLREG_ACTL);
		if (sc->sc_recmon)
			tmp |= ESO_CTLREG_ACTL_RECMON;
		else
			tmp &= ~ESO_CTLREG_ACTL_RECMON;
		eso_write_ctlreg(sc, ESO_CTLREG_ACTL, tmp);
		break;

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

		return eso_set_recsrc(sc, cp->un.ord);

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

		return eso_set_preamp(sc, cp->un.ord);

	default:
		return EINVAL;
	}

	return 0;
}

static int
eso_get_port(void *hdl, mixer_ctrl_t *cp)
{
	struct eso_softc *sc;

	sc = hdl;
	switch (cp->dev) {
	case ESO_MASTER_VOL:
		/* Reload from mixer after hardware volume control use. */
		if (sc->sc_gain[cp->dev][ESO_LEFT] == (uint8_t)~0)
			eso_reload_master_vol(sc);
		/* FALLTHROUGH */
	case ESO_DAC_PLAY_VOL:
	case ESO_MIC_PLAY_VOL:
	case ESO_LINE_PLAY_VOL:
	case ESO_SYNTH_PLAY_VOL:
	case ESO_CD_PLAY_VOL:
	case ESO_AUXB_PLAY_VOL:
	case ESO_RECORD_VOL:
	case ESO_DAC_REC_VOL:
	case ESO_MIC_REC_VOL:
	case ESO_LINE_REC_VOL:
	case ESO_SYNTH_REC_VOL:
	case ESO_CD_REC_VOL:
	case ESO_AUXB_REC_VOL:
		/*
		 * Stereo-capable ports: if a single-channel query is made,
		 * just return the left channel's value (since single-channel
		 * settings themselves are applied to both channels).
		 */
		switch (cp->un.value.num_channels) {
		case 1:
			cp->un.value.level[AUDIO_MIXER_LEVEL_MONO] =
			    sc->sc_gain[cp->dev][ESO_LEFT];
			break;
		case 2:
			cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT] =
			    sc->sc_gain[cp->dev][ESO_LEFT];
			cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT] =
			    sc->sc_gain[cp->dev][ESO_RIGHT];
			break;
		default:
			return EINVAL;
		}
		break;

	case ESO_MONO_PLAY_VOL:
	case ESO_PCSPEAKER_VOL:
	case ESO_MONO_REC_VOL:
	case ESO_SPATIALIZER:
		if (cp->un.value.num_channels != 1)
			return EINVAL;
		cp->un.value.level[AUDIO_MIXER_LEVEL_MONO] =
		    sc->sc_gain[cp->dev][ESO_LEFT];
		break;

	case ESO_RECORD_MONITOR:
		cp->un.ord = sc->sc_recmon;
		break;

	case ESO_RECORD_SOURCE:
		cp->un.ord = sc->sc_recsrc;
		break;

	case ESO_MONOOUT_SOURCE:
		cp->un.ord = sc->sc_monooutsrc;
		break;

	case ESO_MONOIN_BYPASS:
		cp->un.ord = sc->sc_monoinbypass;
		break;

	case ESO_SPATIALIZER_ENABLE:
		cp->un.ord = sc->sc_spatializer;
		break;

	case ESO_MIC_PREAMP:
		cp->un.ord = sc->sc_preamp;
		break;

	case ESO_MASTER_MUTE:
		/* Reload from mixer after hardware volume control use. */
		if (sc->sc_gain[ESO_MASTER_VOL][ESO_LEFT] == (uint8_t)~0)
			eso_reload_master_vol(sc);
		cp->un.ord = sc->sc_mvmute;
		break;

	default:
		return EINVAL;
	}

	return 0;
}

static int
eso_query_devinfo(void *hdl, mixer_devinfo_t *dip)
{

	switch (dip->index) {
	case ESO_DAC_PLAY_VOL:
		dip->mixer_class = ESO_INPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNdac);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_MIC_PLAY_VOL:
		dip->mixer_class = ESO_INPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNmicrophone);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_LINE_PLAY_VOL:
		dip->mixer_class = ESO_INPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNline);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_SYNTH_PLAY_VOL:
		dip->mixer_class = ESO_INPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNfmsynth);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_MONO_PLAY_VOL:
		dip->mixer_class = ESO_INPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "mono_in");
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 1;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_CD_PLAY_VOL:
		dip->mixer_class = ESO_INPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNcd);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_AUXB_PLAY_VOL:
		dip->mixer_class = ESO_INPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "auxb");
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;

	case ESO_MIC_PREAMP:
		dip->mixer_class = ESO_MICROPHONE_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNpreamp);
		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;
		break;
	case ESO_MICROPHONE_CLASS:
		dip->mixer_class = ESO_MICROPHONE_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNmicrophone);
		dip->type = AUDIO_MIXER_CLASS;
		break;

	case ESO_INPUT_CLASS:
		dip->mixer_class = ESO_INPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioCinputs);
		dip->type = AUDIO_MIXER_CLASS;
		break;

	case ESO_MASTER_VOL:
		dip->mixer_class = ESO_OUTPUT_CLASS;
		dip->prev = AUDIO_MIXER_LAST;
		dip->next = ESO_MASTER_MUTE;
		strcpy(dip->label.name, AudioNmaster);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_MASTER_MUTE:
		dip->mixer_class = ESO_OUTPUT_CLASS;
		dip->prev = ESO_MASTER_VOL;
		dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNmute);
		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;
		break;

	case ESO_PCSPEAKER_VOL:
		dip->mixer_class = ESO_OUTPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "pc_speaker");
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 1;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_MONOOUT_SOURCE:
		dip->mixer_class = ESO_OUTPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "mono_out");
		dip->type = AUDIO_MIXER_ENUM;
		dip->un.e.num_mem = 3;
		strcpy(dip->un.e.member[0].label.name, AudioNmute);
		dip->un.e.member[0].ord = ESO_MIXREG_MPM_MOMUTE;
		strcpy(dip->un.e.member[1].label.name, AudioNdac);
		dip->un.e.member[1].ord = ESO_MIXREG_MPM_MOA2R;
		strcpy(dip->un.e.member[2].label.name, AudioNmixerout);
		dip->un.e.member[2].ord = ESO_MIXREG_MPM_MOREC;
		break;

	case ESO_MONOIN_BYPASS:
		dip->mixer_class = ESO_MONOIN_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "bypass");
		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;
		break;
	case ESO_MONOIN_CLASS:
		dip->mixer_class = ESO_MONOIN_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "mono_in");
		dip->type = AUDIO_MIXER_CLASS;
		break;

	case ESO_SPATIALIZER:
		dip->mixer_class = ESO_OUTPUT_CLASS;
		dip->prev = AUDIO_MIXER_LAST;
		dip->next = ESO_SPATIALIZER_ENABLE;
		strcpy(dip->label.name, AudioNspatial);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 1;
		strcpy(dip->un.v.units.name, "level");
		break;
	case ESO_SPATIALIZER_ENABLE:
		dip->mixer_class = ESO_OUTPUT_CLASS;
		dip->prev = ESO_SPATIALIZER;
		dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "enable");
		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;
		break;

	case ESO_OUTPUT_CLASS:
		dip->mixer_class = ESO_OUTPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioCoutputs);
		dip->type = AUDIO_MIXER_CLASS;
		break;

	case ESO_RECORD_MONITOR:
		dip->mixer_class = ESO_MONITOR_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNmute);
		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;
		break;
	case ESO_MONITOR_CLASS:
		dip->mixer_class = ESO_MONITOR_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioCmonitor);
		dip->type = AUDIO_MIXER_CLASS;
		break;

	case ESO_RECORD_VOL:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNrecord);
		dip->type = AUDIO_MIXER_VALUE;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_RECORD_SOURCE:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNsource);
		dip->type = AUDIO_MIXER_ENUM;
		dip->un.e.num_mem = 4;
		strcpy(dip->un.e.member[0].label.name, AudioNmicrophone);
		dip->un.e.member[0].ord = ESO_MIXREG_ERS_MIC;
		strcpy(dip->un.e.member[1].label.name, AudioNline);
		dip->un.e.member[1].ord = ESO_MIXREG_ERS_LINE;
		strcpy(dip->un.e.member[2].label.name, AudioNcd);
		dip->un.e.member[2].ord = ESO_MIXREG_ERS_CD;
		strcpy(dip->un.e.member[3].label.name, AudioNmixerout);
		dip->un.e.member[3].ord = ESO_MIXREG_ERS_MIXER;
		break;
	case ESO_DAC_REC_VOL:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNdac);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_MIC_REC_VOL:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNmicrophone);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_LINE_REC_VOL:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNline);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_SYNTH_REC_VOL:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNfmsynth);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_MONO_REC_VOL:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "mono_in");
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 1; /* No lies */
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_CD_REC_VOL:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNcd);
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_AUXB_REC_VOL:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "auxb");
		dip->type = AUDIO_MIXER_VALUE;
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		break;
	case ESO_RECORD_CLASS:
		dip->mixer_class = ESO_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioCrecord);
		dip->type = AUDIO_MIXER_CLASS;
		break;

	default:
		return ENXIO;
	}

	return 0;
}

static int
eso_allocmem(struct eso_softc *sc, size_t size, size_t align,
    size_t boundary, int flags, int direction, struct eso_dma *ed)
{
	int error, wait;

	wait = (flags & M_NOWAIT) ? BUS_DMA_NOWAIT : BUS_DMA_WAITOK;
	ed->ed_size = size;

	error = bus_dmamem_alloc(ed->ed_dmat, ed->ed_size, align, boundary,
	    ed->ed_segs, sizeof (ed->ed_segs) / sizeof (ed->ed_segs[0]),
	    &ed->ed_nsegs, wait);
	if (error)
		goto out;

	error = bus_dmamem_map(ed->ed_dmat, ed->ed_segs, ed->ed_nsegs,
	    ed->ed_size, &ed->ed_kva, wait | BUS_DMA_COHERENT);
	if (error)
		goto free;

	error = bus_dmamap_create(ed->ed_dmat, ed->ed_size, 1, ed->ed_size, 0,
	    wait, &ed->ed_map);
	if (error)
		goto unmap;

	error = bus_dmamap_load(ed->ed_dmat, ed->ed_map, ed->ed_kva,
	    ed->ed_size, NULL, wait |
	    (direction == AUMODE_RECORD) ? BUS_DMA_READ : BUS_DMA_WRITE);
	if (error)
		goto destroy;

	return 0;

 destroy:
	bus_dmamap_destroy(ed->ed_dmat, ed->ed_map);
 unmap:
	bus_dmamem_unmap(ed->ed_dmat, ed->ed_kva, ed->ed_size);
 free:
	bus_dmamem_free(ed->ed_dmat, ed->ed_segs, ed->ed_nsegs);
 out:
	return error;
}

static void
eso_freemem(struct eso_dma *ed)
{

	bus_dmamap_unload(ed->ed_dmat, ed->ed_map);
	bus_dmamap_destroy(ed->ed_dmat, ed->ed_map);
	bus_dmamem_unmap(ed->ed_dmat, ed->ed_kva, ed->ed_size);
	bus_dmamem_free(ed->ed_dmat, ed->ed_segs, ed->ed_nsegs);
}

static struct eso_dma *
eso_kva2dma(const struct eso_softc *sc, const void *kva)
{
	struct eso_dma *p;

	SLIST_FOREACH(p, &sc->sc_dmas, ed_slist) {
		if (KVADDR(p) == kva)
			return p;
	}

	panic("%s: kva2dma: bad kva: %p", sc->sc_dev.dv_xname, kva);
	/* NOTREACHED */
}

static void *
eso_allocm(void *hdl, int direction, size_t size, struct malloc_type *type,
    int flags)
{
	struct eso_softc *sc;
	struct eso_dma *ed;
	size_t boundary;
	int error;

	sc = hdl;
	if ((ed = malloc(sizeof (*ed), type, flags)) == NULL)
		return NULL;

	/*
	 * Apparently the Audio 1 DMA controller's current address
	 * register can't roll over a 64K address boundary, so we have to
	 * take care of that ourselves.  Similarly, the Audio 2 DMA
	 * controller needs a 1M address boundary.
	 */
	if (direction == AUMODE_RECORD)
		boundary = 0x10000;
	else
		boundary = 0x100000;

	/*
	 * XXX Work around allocation problems for Audio 1, which
	 * XXX implements the 24 low address bits only, with
	 * XXX machine-specific DMA tag use.
	 */
#ifdef alpha
	/*
	 * XXX Force allocation through the (ISA) SGMAP.
	 */
	if (direction == AUMODE_RECORD)
		ed->ed_dmat = alphabus_dma_get_tag(sc->sc_dmat, ALPHA_BUS_ISA);
	else
#elif defined(amd64) || defined(i386)
	/*
	 * XXX Force allocation through the ISA DMA tag.
	 */
	if (direction == AUMODE_RECORD)
		ed->ed_dmat = &isa_bus_dma_tag;
	else
#endif
		ed->ed_dmat = sc->sc_dmat;

	error = eso_allocmem(sc, size, 32, boundary, flags, direction, ed);
	if (error) {
		free(ed, type);
		return NULL;
	}
	SLIST_INSERT_HEAD(&sc->sc_dmas, ed, ed_slist);

	return KVADDR(ed);
}

static void
eso_freem(void *hdl, void *addr, struct malloc_type *type)
{
	struct eso_softc *sc;
	struct eso_dma *p;

	sc = hdl;
	p = eso_kva2dma(sc, addr);

	SLIST_REMOVE(&sc->sc_dmas, p, eso_dma, ed_slist);
	eso_freemem(p);
	free(p, type);
}

static size_t
eso_round_buffersize(void *hdl, int direction, size_t bufsize)
{
	size_t maxsize;

	/*
	 * The playback DMA buffer size on the Solo-1 is limited to 0xfff0
	 * bytes.  This is because IO_A2DMAC is a two byte value
	 * indicating the literal byte count, and the 4 least significant
	 * bits are read-only.  Zero is not used as a special case for
	 * 0x10000.
	 *
	 * For recording, DMAC_DMAC is the byte count - 1, so 0x10000 can
	 * be represented.
	 */
	maxsize = (direction == AUMODE_PLAY) ? 0xfff0 : 0x10000;

	if (bufsize > maxsize)
		bufsize = maxsize;

	return bufsize;
}

static paddr_t
eso_mappage(void *hdl, void *addr, off_t offs, int prot)
{
	struct eso_softc *sc;
	struct eso_dma *ed;

	sc = hdl;
	if (offs < 0)
		return -1;
	ed = eso_kva2dma(sc, addr);

	return bus_dmamem_mmap(ed->ed_dmat, ed->ed_segs, ed->ed_nsegs,
	    offs, prot, BUS_DMA_WAITOK);
}

/* ARGSUSED */
static int
eso_get_props(void *hdl)
{

	return AUDIO_PROP_MMAP | AUDIO_PROP_INDEPENDENT |
	    AUDIO_PROP_FULLDUPLEX;
}

static int
eso_trigger_output(void *hdl, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, const audio_params_t *param)
{
	struct eso_softc *sc;
	struct eso_dma *ed;
	uint8_t a2c1;

	sc = hdl;
	DPRINTF((
	    "%s: trigger_output: start %p, end %p, blksize %d, intr %p(%p)\n",
	    device_xname(&sc->sc_dev), start, end, blksize, intr, arg));
	DPRINTF(("%s: param: rate %u, encoding %u, precision %u, channels %u\n",
	    device_xname(&sc->sc_dev), param->sample_rate, param->encoding,
	    param->precision, param->channels));

	/* Find DMA buffer. */
	ed = eso_kva2dma(sc, start);
	DPRINTF(("%s: dmaaddr %lx\n",
	    device_xname(&sc->sc_dev), (unsigned long)DMAADDR(ed)));

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

	/* Compute drain timeout. */
	sc->sc_pdrain = (blksize * NBBY * hz) /
	    (param->sample_rate * param->channels *
	     param->precision) + 2;	/* slop */

	/* DMA transfer count (in `words'!) reload using 2's complement. */
	blksize = -(blksize >> 1);
	eso_write_mixreg(sc, ESO_MIXREG_A2TCRLO, blksize & 0xff);
	eso_write_mixreg(sc, ESO_MIXREG_A2TCRHI, blksize >> 8);

	/* Update DAC to reflect DMA count and audio parameters. */
	/* Note: we cache A2C2 in order to avoid r/m/w at interrupt time. */
	if (param->precision == 16)
		sc->sc_a2c2 |= ESO_MIXREG_A2C2_16BIT;
	else
		sc->sc_a2c2 &= ~ESO_MIXREG_A2C2_16BIT;
	if (param->channels == 2)
		sc->sc_a2c2 |= ESO_MIXREG_A2C2_STEREO;
	else
		sc->sc_a2c2 &= ~ESO_MIXREG_A2C2_STEREO;
	if (param->encoding == AUDIO_ENCODING_SLINEAR_BE ||
	    param->encoding == AUDIO_ENCODING_SLINEAR_LE)
		sc->sc_a2c2 |= ESO_MIXREG_A2C2_SIGNED;
	else
		sc->sc_a2c2 &= ~ESO_MIXREG_A2C2_SIGNED;
	/* Unmask IRQ. */
	sc->sc_a2c2 |= ESO_MIXREG_A2C2_IRQM;
	eso_write_mixreg(sc, ESO_MIXREG_A2C2, sc->sc_a2c2);

	/* Set up DMA controller. */
	bus_space_write_4(sc->sc_iot, sc->sc_ioh, ESO_IO_A2DMAA,
	    DMAADDR(ed));
	bus_space_write_2(sc->sc_iot, sc->sc_ioh, ESO_IO_A2DMAC,
	    (uint8_t *)end - (uint8_t *)start);
	bus_space_write_1(sc->sc_iot, sc->sc_ioh, ESO_IO_A2DMAM,
	    ESO_IO_A2DMAM_DMAENB | ESO_IO_A2DMAM_AUTO);

	/* Start DMA. */
	a2c1 = eso_read_mixreg(sc, ESO_MIXREG_A2C1);
	a2c1 &= ~ESO_MIXREG_A2C1_RESV0; /* Paranoia? XXX bit 5 */
	a2c1 |= ESO_MIXREG_A2C1_FIFOENB | ESO_MIXREG_A2C1_DMAENB |
	    ESO_MIXREG_A2C1_AUTO;
	eso_write_mixreg(sc, ESO_MIXREG_A2C1, a2c1);

	return 0;
}

static int
eso_trigger_input(void *hdl, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, const audio_params_t *param)
{
	struct eso_softc *sc;
	struct eso_dma *ed;
	uint8_t actl, a1c1;

	sc = hdl;
	DPRINTF((
	    "%s: trigger_input: start %p, end %p, blksize %d, intr %p(%p)\n",
	    device_xname(&sc->sc_dev), start, end, blksize, intr, arg));
	DPRINTF(("%s: param: rate %u, encoding %u, precision %u, channels %u\n",
	    device_xname(&sc->sc_dev), param->sample_rate, param->encoding,
	    param->precision, param->channels));

	/*
	 * If we failed to configure the Audio 1 DMA controller, bail here
	 * while retaining availability of the DAC direction (in Audio 2).
	 */
	if (!sc->sc_dmac_configured)
		return EIO;

	/* Find DMA buffer. */
	ed = eso_kva2dma(sc, start);
	DPRINTF(("%s: dmaaddr %lx\n",
	    device_xname(&sc->sc_dev), (unsigned long)DMAADDR(ed)));

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

	/* Compute drain timeout. */
	sc->sc_rdrain = (blksize * NBBY * hz) /
	    (param->sample_rate * param->channels *
	     param->precision) + 2;	/* slop */

	/* Set up ADC DMA converter parameters. */
	actl = eso_read_ctlreg(sc, ESO_CTLREG_ACTL);
	if (param->channels == 2) {
		actl &= ~ESO_CTLREG_ACTL_MONO;
		actl |= ESO_CTLREG_ACTL_STEREO;
	} else {
		actl &= ~ESO_CTLREG_ACTL_STEREO;
		actl |= ESO_CTLREG_ACTL_MONO;
	}
	eso_write_ctlreg(sc, ESO_CTLREG_ACTL, actl);

	/* Set up Transfer Type: maybe move to attach time? */
	eso_write_ctlreg(sc, ESO_CTLREG_A1TT, ESO_CTLREG_A1TT_DEMAND4);

	/* DMA transfer count reload using 2's complement. */
	blksize = -blksize;
	eso_write_ctlreg(sc, ESO_CTLREG_A1TCRLO, blksize & 0xff);
	eso_write_ctlreg(sc, ESO_CTLREG_A1TCRHI, blksize >> 8);

	/* Set up and enable Audio 1 DMA FIFO. */
	a1c1 = ESO_CTLREG_A1C1_RESV1 | ESO_CTLREG_A1C1_FIFOENB;
	if (param->precision == 16)
		a1c1 |= ESO_CTLREG_A1C1_16BIT;
	if (param->channels == 2)
		a1c1 |= ESO_CTLREG_A1C1_STEREO;
	else
		a1c1 |= ESO_CTLREG_A1C1_MONO;
	if (param->encoding == AUDIO_ENCODING_SLINEAR_BE ||
	    param->encoding == AUDIO_ENCODING_SLINEAR_LE)
		a1c1 |= ESO_CTLREG_A1C1_SIGNED;
	eso_write_ctlreg(sc, ESO_CTLREG_A1C1, a1c1);

	/* Set up ADC IRQ/DRQ parameters. */
	eso_write_ctlreg(sc, ESO_CTLREG_LAIC,
	    ESO_CTLREG_LAIC_PINENB | ESO_CTLREG_LAIC_EXTENB);
	eso_write_ctlreg(sc, ESO_CTLREG_DRQCTL,
	    ESO_CTLREG_DRQCTL_ENB1 | ESO_CTLREG_DRQCTL_EXTENB);

	/* Set up and enable DMA controller. */
	bus_space_write_1(sc->sc_dmac_iot, sc->sc_dmac_ioh, ESO_DMAC_CLEAR, 0);
	bus_space_write_1(sc->sc_dmac_iot, sc->sc_dmac_ioh, ESO_DMAC_MASK,
	    ESO_DMAC_MASK_MASK);
	bus_space_write_1(sc->sc_dmac_iot, sc->sc_dmac_ioh, ESO_DMAC_MODE,
	    DMA37MD_WRITE | DMA37MD_LOOP | DMA37MD_DEMAND);
	bus_space_write_4(sc->sc_dmac_iot, sc->sc_dmac_ioh, ESO_DMAC_DMAA,
	    DMAADDR(ed));
	bus_space_write_2(sc->sc_dmac_iot, sc->sc_dmac_ioh, ESO_DMAC_DMAC,
	    (uint8_t *)end - (uint8_t *)start - 1);
	bus_space_write_1(sc->sc_dmac_iot, sc->sc_dmac_ioh, ESO_DMAC_MASK, 0);

	/* Start DMA. */
	eso_write_ctlreg(sc, ESO_CTLREG_A1C2,
	    ESO_CTLREG_A1C2_DMAENB | ESO_CTLREG_A1C2_READ |
	    ESO_CTLREG_A1C2_AUTO | ESO_CTLREG_A1C2_ADC);

	return 0;
}

/*
 * Mixer utility functions.
 */
static int
eso_set_recsrc(struct eso_softc *sc, unsigned int recsrc)
{
	mixer_devinfo_t di;
	int i;

	di.index = ESO_RECORD_SOURCE;
	if (eso_query_devinfo(sc, &di) != 0)
		panic("eso_set_recsrc: eso_query_devinfo failed");

	for (i = 0; i < di.un.e.num_mem; i++) {
		if (recsrc == di.un.e.member[i].ord) {
			eso_write_mixreg(sc, ESO_MIXREG_ERS, recsrc);
			sc->sc_recsrc = recsrc;
			return 0;
		}
	}

	return EINVAL;
}

static int
eso_set_monooutsrc(struct eso_softc *sc, unsigned int monooutsrc)
{
	mixer_devinfo_t di;
	int i;
	uint8_t mpm;

	di.index = ESO_MONOOUT_SOURCE;
	if (eso_query_devinfo(sc, &di) != 0)
		panic("eso_set_monooutsrc: eso_query_devinfo failed");

	for (i = 0; i < di.un.e.num_mem; i++) {
		if (monooutsrc == di.un.e.member[i].ord) {
			mpm = eso_read_mixreg(sc, ESO_MIXREG_MPM);
			mpm &= ~ESO_MIXREG_MPM_MOMASK;
			mpm |= monooutsrc;
			eso_write_mixreg(sc, ESO_MIXREG_MPM, mpm);
			sc->sc_monooutsrc = monooutsrc;
			return 0;
		}
	}

	return EINVAL;
}

static int
eso_set_monoinbypass(struct eso_softc *sc, unsigned int monoinbypass)
{
	mixer_devinfo_t di;
	int i;
	uint8_t mpm;

	di.index = ESO_MONOIN_BYPASS;
	if (eso_query_devinfo(sc, &di) != 0)
		panic("eso_set_monoinbypass: eso_query_devinfo failed");

	for (i = 0; i < di.un.e.num_mem; i++) {
		if (monoinbypass == di.un.e.member[i].ord) {
			mpm = eso_read_mixreg(sc, ESO_MIXREG_MPM);
			mpm &= ~(ESO_MIXREG_MPM_MOMASK | ESO_MIXREG_MPM_RESV0);
			mpm |= (monoinbypass ? ESO_MIXREG_MPM_MIBYPASS : 0);
			eso_write_mixreg(sc, ESO_MIXREG_MPM, mpm);
			sc->sc_monoinbypass = monoinbypass;
			return 0;
		}
	}

	return EINVAL;
}

static int
eso_set_preamp(struct eso_softc *sc, unsigned int preamp)
{
	mixer_devinfo_t di;
	int i;
	uint8_t mpm;

	di.index = ESO_MIC_PREAMP;
	if (eso_query_devinfo(sc, &di) != 0)
		panic("eso_set_preamp: eso_query_devinfo failed");

	for (i = 0; i < di.un.e.num_mem; i++) {
		if (preamp == di.un.e.member[i].ord) {
			mpm = eso_read_mixreg(sc, ESO_MIXREG_MPM);
			mpm &= ~(ESO_MIXREG_MPM_PREAMP | ESO_MIXREG_MPM_RESV0);
			mpm |= (preamp ? ESO_MIXREG_MPM_PREAMP : 0);
			eso_write_mixreg(sc, ESO_MIXREG_MPM, mpm);
			sc->sc_preamp = preamp;
			return 0;
		}
	}

	return EINVAL;
}

/*
 * Reload Master Volume and Mute values in softc from mixer; used when
 * those have previously been invalidated by use of hardware volume controls.
 */
static void
eso_reload_master_vol(struct eso_softc *sc)
{
	uint8_t mv;

	mv = eso_read_mixreg(sc, ESO_MIXREG_LMVM);
	sc->sc_gain[ESO_MASTER_VOL][ESO_LEFT] =
	    (mv & ~ESO_MIXREG_LMVM_MUTE) << 2;
	mv = eso_read_mixreg(sc, ESO_MIXREG_LMVM);
	sc->sc_gain[ESO_MASTER_VOL][ESO_RIGHT] =
	    (mv & ~ESO_MIXREG_RMVM_MUTE) << 2;
	/* Currently both channels are muted simultaneously; either is OK. */
	sc->sc_mvmute = (mv & ESO_MIXREG_RMVM_MUTE) != 0;
}

static void
eso_set_gain(struct eso_softc *sc, unsigned int port)
{
	uint8_t mixreg, tmp;

	switch (port) {
	case ESO_DAC_PLAY_VOL:
		mixreg = ESO_MIXREG_PVR_A2;
		break;
	case ESO_MIC_PLAY_VOL:
		mixreg = ESO_MIXREG_PVR_MIC;
		break;
	case ESO_LINE_PLAY_VOL:
		mixreg = ESO_MIXREG_PVR_LINE;
		break;
	case ESO_SYNTH_PLAY_VOL:
		mixreg = ESO_MIXREG_PVR_SYNTH;
		break;
	case ESO_CD_PLAY_VOL:
		mixreg = ESO_MIXREG_PVR_CD;
		break;
	case ESO_AUXB_PLAY_VOL:
		mixreg = ESO_MIXREG_PVR_AUXB;
		break;

	case ESO_DAC_REC_VOL:
		mixreg = ESO_MIXREG_RVR_A2;
		break;
	case ESO_MIC_REC_VOL:
		mixreg = ESO_MIXREG_RVR_MIC;
		break;
	case ESO_LINE_REC_VOL:
		mixreg = ESO_MIXREG_RVR_LINE;
		break;
	case ESO_SYNTH_REC_VOL:
		mixreg = ESO_MIXREG_RVR_SYNTH;
		break;
	case ESO_CD_REC_VOL:
		mixreg = ESO_MIXREG_RVR_CD;
		break;
	case ESO_AUXB_REC_VOL:
		mixreg = ESO_MIXREG_RVR_AUXB;
		break;
	case ESO_MONO_PLAY_VOL:
		mixreg = ESO_MIXREG_PVR_MONO;
		break;
	case ESO_MONO_REC_VOL:
		mixreg = ESO_MIXREG_RVR_MONO;
		break;

	case ESO_PCSPEAKER_VOL:
		/* Special case - only 3-bit, mono, and reserved bits. */
		tmp = eso_read_mixreg(sc, ESO_MIXREG_PCSVR);
		tmp &= ESO_MIXREG_PCSVR_RESV;
		/* Map bits 7:5 -> 2:0. */
		tmp |= (sc->sc_gain[port][ESO_LEFT] >> 5);
		eso_write_mixreg(sc, ESO_MIXREG_PCSVR, tmp);
		return;

	case ESO_MASTER_VOL:
		/* Special case - separate regs, and 6-bit precision. */
		/* Map bits 7:2 -> 5:0, reflect mute settings. */
		eso_write_mixreg(sc, ESO_MIXREG_LMVM,
		    (sc->sc_gain[port][ESO_LEFT] >> 2) |
		    (sc->sc_mvmute ? ESO_MIXREG_LMVM_MUTE : 0x00));
		eso_write_mixreg(sc, ESO_MIXREG_RMVM,
		    (sc->sc_gain[port][ESO_RIGHT] >> 2) |
		    (sc->sc_mvmute ? ESO_MIXREG_RMVM_MUTE : 0x00));
		return;

	case ESO_SPATIALIZER:
		/* Special case - only `mono', and higher precision. */
		eso_write_mixreg(sc, ESO_MIXREG_SPATLVL,
		    sc->sc_gain[port][ESO_LEFT]);
		return;

	case ESO_RECORD_VOL:
		/* Very Special case, controller register. */
		eso_write_ctlreg(sc, ESO_CTLREG_RECLVL,ESO_4BIT_GAIN_TO_STEREO(
		   sc->sc_gain[port][ESO_LEFT], sc->sc_gain[port][ESO_RIGHT]));
		return;

	default:
#ifdef DIAGNOSTIC
		panic("eso_set_gain: bad port %u", port);
		/* NOTREACHED */
#else
		return;
#endif
	}

	eso_write_mixreg(sc, mixreg, ESO_4BIT_GAIN_TO_STEREO(
	    sc->sc_gain[port][ESO_LEFT], sc->sc_gain[port][ESO_RIGHT]));
}