xref: /freebsd/sys/dev/sound/pci/hdsp.c (revision 5687c71d)

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2012-2016 Ruslan Bukin <br@bsdpad.com>
 * Copyright (c) 2023-2024 Florian Walpen <dev@submerge.ch>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

/*
 * RME HDSP driver for FreeBSD.
 * Supported cards: HDSP 9632, HDSP 9652.
 */

#include <sys/types.h>
#include <sys/sysctl.h>

#include <dev/sound/pcm/sound.h>
#include <dev/sound/pci/hdsp.h>

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

#include <mixer_if.h>

static bool hdsp_unified_pcm = false;

static SYSCTL_NODE(_hw, OID_AUTO, hdsp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "PCI HDSP");

SYSCTL_BOOL(_hw_hdsp, OID_AUTO, unified_pcm, CTLFLAG_RWTUN,
    &hdsp_unified_pcm, 0, "Combine physical ports in one unified pcm device");

static struct hdsp_clock_source hdsp_clock_source_table_9632[] = {
	{ "internal", HDSP_CLOCK_INTERNAL },
	{ "adat",     HDSP_CLOCK_ADAT1    },
	{ "spdif",    HDSP_CLOCK_SPDIF    },
	{ "word",     HDSP_CLOCK_WORD     },
	{ NULL,       HDSP_CLOCK_INTERNAL }
};

static struct hdsp_clock_source hdsp_clock_source_table_9652[] = {
	{ "internal",  HDSP_CLOCK_INTERNAL  },
	{ "adat1",     HDSP_CLOCK_ADAT1     },
	{ "adat2",     HDSP_CLOCK_ADAT2     },
	{ "adat3",     HDSP_CLOCK_ADAT3     },
	{ "spdif",     HDSP_CLOCK_SPDIF     },
	{ "word",      HDSP_CLOCK_WORD      },
	{ "adat_sync", HDSP_CLOCK_ADAT_SYNC },
	{ NULL,        HDSP_CLOCK_INTERNAL  }
};

static struct hdsp_channel chan_map_9632[] = {
	{ HDSP_CHAN_9632_ADAT,    "adat" },
	{ HDSP_CHAN_9632_SPDIF, "s/pdif" },
	{ HDSP_CHAN_9632_LINE,    "line" },
	{ 0,                        NULL },
};

static struct hdsp_channel chan_map_9632_uni[] = {
	{ HDSP_CHAN_9632_ALL, "all" },
	{ 0,                   NULL },
};

static struct hdsp_channel chan_map_9652[] = {
	{ HDSP_CHAN_9652_ADAT1,  "adat1" },
	{ HDSP_CHAN_9652_ADAT2,  "adat2" },
	{ HDSP_CHAN_9652_ADAT3,  "adat3" },
	{ HDSP_CHAN_9652_SPDIF, "s/pdif" },
	{ 0,                        NULL },
};

static struct hdsp_channel chan_map_9652_uni[] = {
	{ HDSP_CHAN_9652_ALL, "all" },
	{ 0,                   NULL },
};

static void
hdsp_intr(void *p)
{
	struct sc_pcminfo *scp;
	struct sc_info *sc;
	device_t *devlist;
	int devcount;
	int status;
	int err;
	int i;

	sc = (struct sc_info *)p;

	snd_mtxlock(sc->lock);

	status = hdsp_read_1(sc, HDSP_STATUS_REG);
	if (status & HDSP_AUDIO_IRQ_PENDING) {
		if ((err = device_get_children(sc->dev, &devlist, &devcount)) != 0)
			return;

		for (i = 0; i < devcount; i++) {
			scp = device_get_ivars(devlist[i]);
			if (scp->ih != NULL)
				scp->ih(scp);
		}

		hdsp_write_1(sc, HDSP_INTERRUPT_ACK, 0);
		free(devlist, M_TEMP);
	}

	snd_mtxunlock(sc->lock);
}

static void
hdsp_dmapsetmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
#if 0
	device_printf(sc->dev, "hdsp_dmapsetmap()\n");
#endif
}

static int
hdsp_alloc_resources(struct sc_info *sc)
{

	/* Allocate resource. */
	sc->csid = PCIR_BAR(0);
	sc->cs = bus_alloc_resource_any(sc->dev, SYS_RES_MEMORY,
	    &sc->csid, RF_ACTIVE);

	if (!sc->cs) {
		device_printf(sc->dev, "Unable to map SYS_RES_MEMORY.\n");
		return (ENXIO);
	}

	sc->cst = rman_get_bustag(sc->cs);
	sc->csh = rman_get_bushandle(sc->cs);

	/* Allocate interrupt resource. */
	sc->irqid = 0;
	sc->irq = bus_alloc_resource_any(sc->dev, SYS_RES_IRQ, &sc->irqid,
	    RF_ACTIVE | RF_SHAREABLE);

	if (!sc->irq ||
	    bus_setup_intr(sc->dev, sc->irq, INTR_MPSAFE | INTR_TYPE_AV,
		NULL, hdsp_intr, sc, &sc->ih)) {
		device_printf(sc->dev, "Unable to alloc interrupt resource.\n");
		return (ENXIO);
	}

	/* Allocate DMA resources. */
	if (bus_dma_tag_create(/*parent*/bus_get_dma_tag(sc->dev),
		/*alignment*/4,
		/*boundary*/0,
		/*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
		/*highaddr*/BUS_SPACE_MAXADDR,
		/*filter*/NULL,
		/*filterarg*/NULL,
		/*maxsize*/2 * HDSP_DMASEGSIZE,
		/*nsegments*/2,
		/*maxsegsz*/HDSP_DMASEGSIZE,
		/*flags*/0,
		/*lockfunc*/NULL,
		/*lockarg*/NULL,
		/*dmatag*/&sc->dmat) != 0) {
		device_printf(sc->dev, "Unable to create dma tag.\n");
		return (ENXIO);
	}

	sc->bufsize = HDSP_DMASEGSIZE;

	/* pbuf (play buffer). */
	if (bus_dmamem_alloc(sc->dmat, (void **)&sc->pbuf, BUS_DMA_WAITOK,
	    &sc->pmap)) {
		device_printf(sc->dev, "Can't alloc pbuf.\n");
		return (ENXIO);
	}

	if (bus_dmamap_load(sc->dmat, sc->pmap, sc->pbuf, sc->bufsize,
	    hdsp_dmapsetmap, sc, BUS_DMA_NOWAIT)) {
		device_printf(sc->dev, "Can't load pbuf.\n");
		return (ENXIO);
	}

	/* rbuf (rec buffer). */
	if (bus_dmamem_alloc(sc->dmat, (void **)&sc->rbuf, BUS_DMA_WAITOK,
	    &sc->rmap)) {
		device_printf(sc->dev, "Can't alloc rbuf.\n");
		return (ENXIO);
	}

	if (bus_dmamap_load(sc->dmat, sc->rmap, sc->rbuf, sc->bufsize,
	    hdsp_dmapsetmap, sc, BUS_DMA_NOWAIT)) {
		device_printf(sc->dev, "Can't load rbuf.\n");
		return (ENXIO);
	}

	bzero(sc->pbuf, sc->bufsize);
	bzero(sc->rbuf, sc->bufsize);

	return (0);
}

static void
hdsp_map_dmabuf(struct sc_info *sc)
{
	uint32_t paddr, raddr;

	paddr = vtophys(sc->pbuf);
	raddr = vtophys(sc->rbuf);

	hdsp_write_4(sc, HDSP_PAGE_ADDR_BUF_OUT, paddr);
	hdsp_write_4(sc, HDSP_PAGE_ADDR_BUF_IN, raddr);
}

static int
hdsp_sysctl_sample_rate(SYSCTL_HANDLER_ARGS)
{
	struct sc_info *sc = oidp->oid_arg1;
	int error;
	unsigned int speed, multiplier;

	speed = sc->force_speed;

	/* Process sysctl (unsigned) integer request. */
	error = sysctl_handle_int(oidp, &speed, 0, req);
	if (error != 0 || req->newptr == NULL)
		return (error);

	/* Speed from 32000 to 192000, 0 falls back to pcm speed setting. */
	sc->force_speed = 0;
	if (speed > 0) {
		multiplier = 1;
		if ((speed > (96000 + 128000) / 2) && sc->type == HDSP_9632)
			multiplier = 4;
		else if (speed > (48000 + 64000) / 2)
			multiplier = 2;

		if (speed < ((32000 + 44100) / 2) * multiplier)
			sc->force_speed = 32000 * multiplier;
		else if (speed < ((44100 + 48000) / 2) * multiplier)
			sc->force_speed = 44100 * multiplier;
		else
			sc->force_speed = 48000 * multiplier;
	}

	return (0);
}


static int
hdsp_sysctl_period(SYSCTL_HANDLER_ARGS)
{
	struct sc_info *sc = oidp->oid_arg1;
	int error;
	unsigned int period;

	period = sc->force_period;

	/* Process sysctl (unsigned) integer request. */
	error = sysctl_handle_int(oidp, &period, 0, req);
	if (error != 0 || req->newptr == NULL)
		return (error);

	/* Period is from 2^5 to 2^14, 0 falls back to pcm latency settings. */
	sc->force_period = 0;
	if (period > 0) {
		sc->force_period = 32;
		while (sc->force_period < period && sc->force_period < 4096)
			sc->force_period <<= 1;
	}

	return (0);
}

static uint32_t
hdsp_control_clock_preference(enum hdsp_clock_type type)
{
	switch (type) {
	case HDSP_CLOCK_INTERNAL:
		return (HDSP_CONTROL_MASTER);
	case HDSP_CLOCK_ADAT1:
		return (HDSP_CONTROL_CLOCK(0));
	case HDSP_CLOCK_ADAT2:
		return (HDSP_CONTROL_CLOCK(1));
	case HDSP_CLOCK_ADAT3:
		return (HDSP_CONTROL_CLOCK(2));
	case HDSP_CLOCK_SPDIF:
		return (HDSP_CONTROL_CLOCK(3));
	case HDSP_CLOCK_WORD:
		return (HDSP_CONTROL_CLOCK(4));
	case HDSP_CLOCK_ADAT_SYNC:
		return (HDSP_CONTROL_CLOCK(5));
	default:
		return (HDSP_CONTROL_MASTER);
	}
}

static int
hdsp_sysctl_clock_preference(SYSCTL_HANDLER_ARGS)
{
	struct sc_info *sc;
	struct hdsp_clock_source *clock_table, *clock;
	char buf[16] = "invalid";
	int error;
	uint32_t control;

	sc = oidp->oid_arg1;

	/* Select sync ports table for device type. */
	if (sc->type == HDSP_9632)
		clock_table = hdsp_clock_source_table_9632;
	else if (sc->type == HDSP_9652)
		clock_table = hdsp_clock_source_table_9652;
	else
		return (ENXIO);

	/* Extract preferred clock source from control register. */
	control = sc->ctrl_register & HDSP_CONTROL_CLOCK_MASK;
	for (clock = clock_table; clock->name != NULL; ++clock) {
		if (hdsp_control_clock_preference(clock->type) == control)
			break;
	}
	if (clock->name != NULL)
		strlcpy(buf, clock->name, sizeof(buf));

	/* Process sysctl string request. */
	error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
	if (error != 0 || req->newptr == NULL)
		return (error);

	/* Find clock source matching the sysctl string. */
	for (clock = clock_table; clock->name != NULL; ++clock) {
		if (strncasecmp(buf, clock->name, sizeof(buf)) == 0)
			break;
	}

	/* Set preferred clock source in control register. */
	if (clock->name != NULL) {
		control = hdsp_control_clock_preference(clock->type);
		control &= HDSP_CONTROL_CLOCK_MASK;
		snd_mtxlock(sc->lock);
		sc->ctrl_register &= ~HDSP_CONTROL_CLOCK_MASK;
		sc->ctrl_register |= control;
		hdsp_write_4(sc, HDSP_CONTROL_REG, sc->ctrl_register);
		snd_mtxunlock(sc->lock);
	}
	return (0);
}

static uint32_t
hdsp_status2_clock_source(enum hdsp_clock_type type)
{
	switch (type) {
	case HDSP_CLOCK_INTERNAL:
		return (0);
	case HDSP_CLOCK_ADAT1:
		return (HDSP_STATUS2_CLOCK(0));
	case HDSP_CLOCK_ADAT2:
		return (HDSP_STATUS2_CLOCK(1));
	case HDSP_CLOCK_ADAT3:
		return (HDSP_STATUS2_CLOCK(2));
	case HDSP_CLOCK_SPDIF:
		return (HDSP_STATUS2_CLOCK(3));
	case HDSP_CLOCK_WORD:
		return (HDSP_STATUS2_CLOCK(4));
	case HDSP_CLOCK_ADAT_SYNC:
		return (HDSP_STATUS2_CLOCK(5));
	default:
		return (0);
	}
}

static int
hdsp_sysctl_clock_source(SYSCTL_HANDLER_ARGS)
{
	struct sc_info *sc;
	struct hdsp_clock_source *clock_table, *clock;
	char buf[16] = "invalid";
	uint32_t status2;

	sc = oidp->oid_arg1;

	/* Select sync ports table for device type. */
	if (sc->type == HDSP_9632)
		clock_table = hdsp_clock_source_table_9632;
	else if (sc->type == HDSP_9652)
		clock_table = hdsp_clock_source_table_9652;
	else
		return (ENXIO);

	/* Read current (autosync) clock source from status2 register. */
	snd_mtxlock(sc->lock);
	status2 = hdsp_read_4(sc, HDSP_STATUS2_REG);
	status2 &= HDSP_STATUS2_CLOCK_MASK;
	snd_mtxunlock(sc->lock);

	/* Translate status2 register value to clock source. */
	for (clock = clock_table; clock->name != NULL; ++clock) {
		/* In clock master mode, override with internal clock source. */
		if (sc->ctrl_register & HDSP_CONTROL_MASTER) {
			if (clock->type == HDSP_CLOCK_INTERNAL)
				break;
		} else if (hdsp_status2_clock_source(clock->type) == status2)
			break;
	}

	/* Process sysctl string request. */
	if (clock->name != NULL)
		strlcpy(buf, clock->name, sizeof(buf));
	return (sysctl_handle_string(oidp, buf, sizeof(buf), req));
}

static int
hdsp_sysctl_clock_list(SYSCTL_HANDLER_ARGS)
{
	struct sc_info *sc;
	struct hdsp_clock_source *clock_table, *clock;
	char buf[256];
	int n;

	sc = oidp->oid_arg1;
	n = 0;

	/* Select clock source table for device type. */
	if (sc->type == HDSP_9632)
		clock_table = hdsp_clock_source_table_9632;
	else if (sc->type == HDSP_9652)
		clock_table = hdsp_clock_source_table_9652;
	else
		return (ENXIO);

	/* List available clock sources. */
	buf[0] = 0;
	for (clock = clock_table; clock->name != NULL; ++clock) {
		if (n > 0)
			n += strlcpy(buf + n, ",", sizeof(buf) - n);
		n += strlcpy(buf + n, clock->name, sizeof(buf) - n);
	}
	return (sysctl_handle_string(oidp, buf, sizeof(buf), req));
}

static bool
hdsp_clock_source_locked(enum hdsp_clock_type type, uint32_t status,
    uint32_t status2)
{
	switch (type) {
	case HDSP_CLOCK_INTERNAL:
		return (true);
	case HDSP_CLOCK_ADAT1:
		return ((status >> 3) & 0x01);
	case HDSP_CLOCK_ADAT2:
		return ((status >> 2) & 0x01);
	case HDSP_CLOCK_ADAT3:
		return ((status >> 1) & 0x01);
	case HDSP_CLOCK_SPDIF:
		return (!((status >> 25) & 0x01));
	case HDSP_CLOCK_WORD:
		return ((status2 >> 3) & 0x01);
	case HDSP_CLOCK_ADAT_SYNC:
		return ((status >> 5) & 0x01);
	default:
		return (false);
	}
}

static bool
hdsp_clock_source_synced(enum hdsp_clock_type type, uint32_t status,
    uint32_t status2)
{
	switch (type) {
	case HDSP_CLOCK_INTERNAL:
		return (true);
	case HDSP_CLOCK_ADAT1:
		return ((status >> 18) & 0x01);
	case HDSP_CLOCK_ADAT2:
		return ((status >> 17) & 0x01);
	case HDSP_CLOCK_ADAT3:
		return ((status >> 16) & 0x01);
	case HDSP_CLOCK_SPDIF:
		return (((status >> 4) & 0x01) && !((status >> 25) & 0x01));
	case HDSP_CLOCK_WORD:
		return ((status2 >> 4) & 0x01);
	case HDSP_CLOCK_ADAT_SYNC:
		return ((status >> 27) & 0x01);
	default:
		return (false);
	}
}

static int
hdsp_sysctl_sync_status(SYSCTL_HANDLER_ARGS)
{
	struct sc_info *sc;
	struct hdsp_clock_source *clock_table, *clock;
	char buf[256];
	char *state;
	int n;
	uint32_t status, status2;

	sc = oidp->oid_arg1;
	n = 0;

	/* Select sync ports table for device type. */
	if (sc->type == HDSP_9632)
		clock_table = hdsp_clock_source_table_9632;
	else if (sc->type == HDSP_9652)
		clock_table = hdsp_clock_source_table_9652;
	else
		return (ENXIO);

	/* Read current lock and sync bits from status registers. */
	snd_mtxlock(sc->lock);
	status = hdsp_read_4(sc, HDSP_STATUS_REG);
	status2 = hdsp_read_4(sc, HDSP_STATUS2_REG);
	snd_mtxunlock(sc->lock);

	/* List clock sources with lock and sync state. */
	for (clock = clock_table; clock->name != NULL; ++clock) {
		if (clock->type == HDSP_CLOCK_INTERNAL)
			continue;
		if (n > 0)
			n += strlcpy(buf + n, ",", sizeof(buf) - n);
		state = "none";
		if (hdsp_clock_source_locked(clock->type, status, status2)) {
			if (hdsp_clock_source_synced(clock->type, status,
			    status2))
				state = "sync";
			else
				state = "lock";
		}
		n += snprintf(buf + n, sizeof(buf) - n, "%s(%s)",
		    clock->name, state);
	}
	return (sysctl_handle_string(oidp, buf, sizeof(buf), req));
}

static int
hdsp_probe(device_t dev)
{
	uint32_t rev;

	if (pci_get_vendor(dev) == PCI_VENDOR_XILINX &&
	    pci_get_device(dev) == PCI_DEVICE_XILINX_HDSP) {
		rev = pci_get_revid(dev);
		switch (rev) {
		case PCI_REVISION_9632:
			device_set_desc(dev, "RME HDSP 9632");
			return (0);
		case PCI_REVISION_9652:
			device_set_desc(dev, "RME HDSP 9652");
			return (0);
		}
	}

	return (ENXIO);
}

static int
hdsp_init(struct sc_info *sc)
{
	unsigned mixer_controls;

	/* Set latency. */
	sc->period = 256;
	/*
	 * The pcm channel latency settings propagate unreliable blocksizes,
	 * different for recording and playback, and skewed due to rounding
	 * and total buffer size limits.
	 * Force period to a consistent default until these issues are fixed.
	 */
	sc->force_period = 256;
	sc->ctrl_register = hdsp_encode_latency(2);

	/* Set rate. */
	sc->speed = HDSP_SPEED_DEFAULT;
	sc->force_speed = 0;
	sc->ctrl_register &= ~HDSP_FREQ_MASK;
	sc->ctrl_register |= HDSP_FREQ_MASK_DEFAULT;

	/* Set internal clock source (master). */
	sc->ctrl_register &= ~HDSP_CONTROL_CLOCK_MASK;
	sc->ctrl_register |= HDSP_CONTROL_MASTER;

	/* SPDIF from coax in, line out. */
	sc->ctrl_register &= ~HDSP_CONTROL_SPDIF_COAX;
	sc->ctrl_register |= HDSP_CONTROL_SPDIF_COAX;
	sc->ctrl_register &= ~HDSP_CONTROL_LINE_OUT;
	sc->ctrl_register |= HDSP_CONTROL_LINE_OUT;

	hdsp_write_4(sc, HDSP_CONTROL_REG, sc->ctrl_register);

	if (sc->type == HDSP_9652)
		hdsp_write_4(sc, HDSP_CONTROL2_REG, HDSP_CONTROL2_9652_MIXER);
	else
		hdsp_write_4(sc, HDSP_CONTROL2_REG, 0);

	switch (sc->type) {
	case HDSP_9632:
		/* Mixer matrix is 2 source rows (input, playback) per output. */
		mixer_controls = 2 * HDSP_MIX_SLOTS_9632 * HDSP_MIX_SLOTS_9632;
		break;
	case HDSP_9652:
		/* Mixer matrix is 2 source rows (input, playback) per output. */
		mixer_controls = 2 * HDSP_MIX_SLOTS_9652 * HDSP_MIX_SLOTS_9652;
		break;
	default:
		return (ENXIO);
	}

	/* Initialize mixer matrix by silencing all controls. */
	for (unsigned offset = 0; offset < mixer_controls * 2; offset += 4) {
		/* Only accepts 4 byte values, pairs of 16 bit volume controls. */
		hdsp_write_4(sc, HDSP_MIXER_BASE + offset,
		    (HDSP_MIN_GAIN << 16) | HDSP_MIN_GAIN);
	}

	/* Reset pointer, rewrite frequency (same register) for 9632. */
	hdsp_write_4(sc, HDSP_RESET_POINTER, 0);
	if (sc->type == HDSP_9632) {
		/* Set DDS value. */
		hdsp_write_4(sc, HDSP_FREQ_REG, hdsp_freq_reg_value(sc->speed));
	}

	return (0);
}

static int
hdsp_attach(device_t dev)
{
	struct hdsp_channel *chan_map;
	struct sc_pcminfo *scp;
	struct sc_info *sc;
	uint32_t rev;
	int i, err;

#if 0
	device_printf(dev, "hdsp_attach()\n");
#endif

	sc = device_get_softc(dev);
	sc->lock = snd_mtxcreate(device_get_nameunit(dev),
	    "snd_hdsp softc");
	sc->dev = dev;

	pci_enable_busmaster(dev);
	rev = pci_get_revid(dev);
	switch (rev) {
	case PCI_REVISION_9632:
		sc->type = HDSP_9632;
		chan_map = hdsp_unified_pcm ? chan_map_9632_uni : chan_map_9632;
		break;
	case PCI_REVISION_9652:
		sc->type = HDSP_9652;
		chan_map = hdsp_unified_pcm ? chan_map_9652_uni : chan_map_9652;
		break;
	default:
		return (ENXIO);
	}

	/* Allocate resources. */
	err = hdsp_alloc_resources(sc);
	if (err) {
		device_printf(dev, "Unable to allocate system resources.\n");
		return (ENXIO);
	}

	if (hdsp_init(sc) != 0)
		return (ENXIO);

	for (i = 0; i < HDSP_MAX_CHANS && chan_map[i].descr != NULL; i++) {
		scp = malloc(sizeof(struct sc_pcminfo), M_DEVBUF, M_NOWAIT | M_ZERO);
		scp->hc = &chan_map[i];
		scp->sc = sc;
		scp->dev = device_add_child(dev, "pcm", -1);
		device_set_ivars(scp->dev, scp);
	}

	hdsp_map_dmabuf(sc);

	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
	    "sync_status", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
	    sc, 0, hdsp_sysctl_sync_status, "A",
	    "List clock source signal lock and sync status");

	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
	    "clock_source", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
	    sc, 0, hdsp_sysctl_clock_source, "A",
	    "Currently effective clock source");

	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
	    "clock_preference", CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_MPSAFE,
	    sc, 0, hdsp_sysctl_clock_preference, "A",
	    "Set 'internal' (master) or preferred autosync clock source");

	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
	    "clock_list", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
	    sc, 0, hdsp_sysctl_clock_list, "A",
	    "List of supported clock sources");

	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
	    "period", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE,
	    sc, 0, hdsp_sysctl_period, "A",
	    "Force period of samples per interrupt (32, 64, ... 4096)");

	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
	    "sample_rate", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE,
	    sc, 0, hdsp_sysctl_sample_rate, "A",
	    "Force sample rate (32000, 44100, 48000, ... 192000)");

	return (bus_generic_attach(dev));
}

static void
hdsp_dmafree(struct sc_info *sc)
{

	bus_dmamap_unload(sc->dmat, sc->rmap);
	bus_dmamap_unload(sc->dmat, sc->pmap);
	bus_dmamem_free(sc->dmat, sc->rbuf, sc->rmap);
	bus_dmamem_free(sc->dmat, sc->pbuf, sc->pmap);
	sc->rbuf = sc->pbuf = NULL;
}

static int
hdsp_detach(device_t dev)
{
	struct sc_info *sc;
	int err;

	sc = device_get_softc(dev);
	if (sc == NULL) {
		device_printf(dev,"Can't detach: softc is null.\n");
		return (0);
	}

	err = device_delete_children(dev);
	if (err)
		return (err);

	hdsp_dmafree(sc);

	if (sc->ih)
		bus_teardown_intr(dev, sc->irq, sc->ih);
	if (sc->dmat)
		bus_dma_tag_destroy(sc->dmat);
	if (sc->irq)
		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq);
	if (sc->cs)
		bus_release_resource(dev, SYS_RES_MEMORY, PCIR_BAR(0), sc->cs);
	if (sc->lock)
		snd_mtxfree(sc->lock);

	return (0);
}

static device_method_t hdsp_methods[] = {
	DEVMETHOD(device_probe,     hdsp_probe),
	DEVMETHOD(device_attach,    hdsp_attach),
	DEVMETHOD(device_detach,    hdsp_detach),
	{ 0, 0 }
};

static driver_t hdsp_driver = {
	"hdsp",
	hdsp_methods,
	PCM_SOFTC_SIZE,
};

DRIVER_MODULE(snd_hdsp, pci, hdsp_driver, 0, 0);