als4000.c

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2001 Orion Hodson <oho@acm.org>
 * 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, WHETHERIN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THEPOSSIBILITY OF
 * SUCH DAMAGE.
 */
 
/*
 * als4000.c - driver for the Avance Logic ALS 4000 chipset.
 *
 * The ALS4000 is effectively an SB16 with a PCI interface.
 *
 * This driver derives from ALS4000a.PDF, Bart Hartgers alsa driver, and
 * SB16 register descriptions.
 */
 
#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_snd.h"
#endif
 
#include <dev/sound/pcm/sound.h>
#include <dev/sound/isa/sb.h>
#include <dev/sound/pci/als4000.h>
 
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
 
#include "mixer_if.h"
 
SND_DECLARE_FILE("$FreeBSD$");
 
/* Debugging macro's */
#undef DEB
#ifndef DEB
#define DEB(x)  /* x */
#endif /* DEB */
 
#define ALS_DEFAULT_BUFSZ 16384
 
/* ------------------------------------------------------------------------- */
/* Structures */
 
struct sc_info;
 
struct sc_chinfo {
        struct sc_info          *parent;
        struct pcm_channel      *channel;
        struct snd_dbuf         *buffer;
        u_int32_t               format, speed, phys_buf, bps;
        u_int32_t               dma_active:1, dma_was_active:1;
        u_int8_t                gcr_fifo_status;
        int                     dir;
};
 
struct sc_info {
        device_t                dev;
        bus_space_tag_t         st;
        bus_space_handle_t      sh;
        bus_dma_tag_t           parent_dmat;
        struct resource         *reg, *irq;
        int                     regid, irqid;
        void                    *ih;
        struct mtx              *lock;
 
        unsigned int            bufsz;
        struct sc_chinfo        pch, rch;
};
 
/* Channel caps */
 
static u_int32_t als_format[] = {
        SND_FORMAT(AFMT_U8, 1, 0),
        SND_FORMAT(AFMT_U8, 2, 0),
        SND_FORMAT(AFMT_S16_LE, 1, 0),
        SND_FORMAT(AFMT_S16_LE, 2, 0),
        0
};
 
/*
 * I don't believe this rotten soundcard can do 48k, really,
 * trust me.
 */
static struct pcmchan_caps als_caps = { 4000, 44100, als_format, 0 };
 
/* ------------------------------------------------------------------------- */
/* Register Utilities */
 
static u_int32_t
als_gcr_rd(struct sc_info *sc, int index)
{
        bus_space_write_1(sc->st, sc->sh, ALS_GCR_INDEX, index);
        return bus_space_read_4(sc->st, sc->sh, ALS_GCR_DATA);
}
 
static void
als_gcr_wr(struct sc_info *sc, int index, int data)
{
        bus_space_write_1(sc->st, sc->sh, ALS_GCR_INDEX, index);
        bus_space_write_4(sc->st, sc->sh, ALS_GCR_DATA, data);
}
 
static u_int8_t
als_intr_rd(struct sc_info *sc)
{
        return bus_space_read_1(sc->st, sc->sh, ALS_SB_MPU_IRQ);
}
 
static void
als_intr_wr(struct sc_info *sc, u_int8_t data)
{
        bus_space_write_1(sc->st, sc->sh, ALS_SB_MPU_IRQ, data);
}
 
static u_int8_t
als_mix_rd(struct sc_info *sc, u_int8_t index)
{
        bus_space_write_1(sc->st, sc->sh, ALS_MIXER_INDEX, index);
        return bus_space_read_1(sc->st, sc->sh, ALS_MIXER_DATA);
}
 
static void
als_mix_wr(struct sc_info *sc, u_int8_t index, u_int8_t data)
{
        bus_space_write_1(sc->st, sc->sh, ALS_MIXER_INDEX, index);
        bus_space_write_1(sc->st, sc->sh, ALS_MIXER_DATA, data);
}
 
static void
als_esp_wr(struct sc_info *sc, u_int8_t data)
{
        u_int32_t       tries, v;
 
        tries = 1000;
        do {
                v = bus_space_read_1(sc->st, sc->sh, ALS_ESP_WR_STATUS);
                if (~v & 0x80)
                        break;
                DELAY(20);
        } while (--tries != 0);
 
        if (tries == 0)
                device_printf(sc->dev, "als_esp_wr timeout");
 
        bus_space_write_1(sc->st, sc->sh, ALS_ESP_WR_DATA, data);
}
 
static int
als_esp_reset(struct sc_info *sc)
{
        u_int32_t       tries, u, v;
 
        bus_space_write_1(sc->st, sc->sh, ALS_ESP_RST, 1);
        DELAY(10);
        bus_space_write_1(sc->st, sc->sh, ALS_ESP_RST, 0);
        DELAY(30);
 
        tries = 1000;
        do {
                u = bus_space_read_1(sc->st, sc->sh, ALS_ESP_RD_STATUS8);
                if (u & 0x80) {
                        v = bus_space_read_1(sc->st, sc->sh, ALS_ESP_RD_DATA);
                        if (v == 0xaa)
                                return 0;
                        else
                                break;
                }
                DELAY(20);
        } while (--tries != 0);
 
        if (tries == 0)
                device_printf(sc->dev, "als_esp_reset timeout");
        return 1;
}
 
static u_int8_t
als_ack_read(struct sc_info *sc, u_int8_t addr)
{
        u_int8_t r = bus_space_read_1(sc->st, sc->sh, addr);
        return r;
}
 
/* ------------------------------------------------------------------------- */
/* Common pcm channel implementation */
 
static void *
alschan_init(kobj_t obj, void *devinfo,
             struct snd_dbuf *b, struct pcm_channel *c, int dir)
{
        struct  sc_info *sc = devinfo;
        struct  sc_chinfo *ch;
 
        snd_mtxlock(sc->lock);
        if (dir == PCMDIR_PLAY) {
                ch = &sc->pch;
                ch->gcr_fifo_status = ALS_GCR_FIFO0_STATUS;
        } else {
                ch = &sc->rch;
                ch->gcr_fifo_status = ALS_GCR_FIFO1_STATUS;
        }
        ch->dir = dir;
        ch->parent = sc;
        ch->channel = c;
        ch->bps = 1;
        ch->format = SND_FORMAT(AFMT_U8, 1, 0);
        ch->speed = DSP_DEFAULT_SPEED;
        ch->buffer = b;
        snd_mtxunlock(sc->lock);
 
        if (sndbuf_alloc(ch->buffer, sc->parent_dmat, 0, sc->bufsz) != 0)
                return NULL;
 
        return ch;
}
 
static int
alschan_setformat(kobj_t obj, void *data, u_int32_t format)
{
        struct  sc_chinfo *ch = data;
 
        ch->format = format;
        return 0;
}
 
static u_int32_t
alschan_setspeed(kobj_t obj, void *data, u_int32_t speed)
{
        struct  sc_chinfo *ch = data, *other;
        struct  sc_info *sc = ch->parent;
 
        other = (ch->dir == PCMDIR_PLAY) ? &sc->rch : &sc->pch;
 
        /* Deny request if other dma channel is active */
        if (other->dma_active) {
                ch->speed = other->speed;
                return other->speed;
        }
 
        ch->speed = speed;
        return speed;
}
 
static u_int32_t
alschan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
{
        struct  sc_chinfo *ch = data;
        struct  sc_info *sc = ch->parent;
 
        if (blocksize > sc->bufsz / 2) {
                blocksize = sc->bufsz / 2;
        }
        sndbuf_resize(ch->buffer, 2, blocksize);
        return blocksize;
}
 
static u_int32_t
alschan_getptr(kobj_t obj, void *data)
{
        struct sc_chinfo *ch = data;
        struct sc_info *sc = ch->parent;
        int32_t pos, sz;
 
        snd_mtxlock(sc->lock);
        pos = als_gcr_rd(ch->parent, ch->gcr_fifo_status) & 0xffff;
        snd_mtxunlock(sc->lock);
        sz  = sndbuf_getsize(ch->buffer);
        return (2 * sz - pos - 1) % sz;
}
 
static struct pcmchan_caps*
alschan_getcaps(kobj_t obj, void *data)
{
        return &als_caps;
}
 
static void
als_set_speed(struct sc_chinfo *ch)
{
        struct sc_info *sc = ch->parent;
        struct sc_chinfo *other;
 
        other = (ch->dir == PCMDIR_PLAY) ? &sc->rch : &sc->pch;
        if (other->dma_active == 0) {
                als_esp_wr(sc, ALS_ESP_SAMPLE_RATE);
                als_esp_wr(sc, ch->speed >> 8);
                als_esp_wr(sc, ch->speed & 0xff);
        } else {
                DEB(printf("speed locked at %d (tried %d)\n",
                           other->speed, ch->speed));
        }
}
 
/* ------------------------------------------------------------------------- */
/* Playback channel implementation */
#define ALS_8BIT_CMD(x, y)  { (x), (y), DSP_DMA8,  DSP_CMD_DMAPAUSE_8  }
#define ALS_16BIT_CMD(x, y) { (x), (y), DSP_DMA16, DSP_CMD_DMAPAUSE_16 }
 
struct playback_command {
        u_int32_t pcm_format;   /* newpcm format */
        u_int8_t  format_val;   /* sb16 format value */
        u_int8_t  dma_prog;     /* sb16 dma program */
        u_int8_t  dma_stop;     /* sb16 stop register */
} static const playback_cmds[] = {
        ALS_8BIT_CMD(SND_FORMAT(AFMT_U8, 1, 0), DSP_MODE_U8MONO),
        ALS_8BIT_CMD(SND_FORMAT(AFMT_U8, 2, 0), DSP_MODE_U8STEREO),
        ALS_16BIT_CMD(SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_MODE_S16MONO),
        ALS_16BIT_CMD(SND_FORMAT(AFMT_S16_LE, 2, 0), DSP_MODE_S16STEREO),
};
 
static const struct playback_command*
als_get_playback_command(u_int32_t format)
{
        u_int32_t i, n;
 
        n = sizeof(playback_cmds) / sizeof(playback_cmds[0]);
        for (i = 0; i < n; i++) {
                if (playback_cmds[i].pcm_format == format) {
                        return &playback_cmds[i];
                }
        }
        DEB(printf("als_get_playback_command: invalid format 0x%08x\n",
                   format));
        return &playback_cmds[0];
}
 
static void
als_playback_start(struct sc_chinfo *ch)
{
        const struct playback_command *p;
        struct  sc_info *sc = ch->parent;
        u_int32_t       buf, bufsz, count, dma_prog;
 
        buf = sndbuf_getbufaddr(ch->buffer);
        bufsz = sndbuf_getsize(ch->buffer);
        count = bufsz / 2;
        if (ch->format & AFMT_16BIT)
                count /= 2;
        count--;
 
        als_esp_wr(sc, DSP_CMD_SPKON);
        als_set_speed(ch);
 
        als_gcr_wr(sc, ALS_GCR_DMA0_START, buf);
        als_gcr_wr(sc, ALS_GCR_DMA0_MODE, (bufsz - 1) | 0x180000);
 
        p = als_get_playback_command(ch->format);
        dma_prog = p->dma_prog | DSP_F16_DAC | DSP_F16_AUTO | DSP_F16_FIFO_ON;
 
        als_esp_wr(sc, dma_prog);
        als_esp_wr(sc, p->format_val);
        als_esp_wr(sc, count & 0xff);
        als_esp_wr(sc, count >> 8);
 
        ch->dma_active = 1;
}
 
static int
als_playback_stop(struct sc_chinfo *ch)
{
        const struct playback_command *p;
        struct sc_info *sc = ch->parent;
        u_int32_t active;
 
        active = ch->dma_active;
        if (active) {
                p = als_get_playback_command(ch->format);
                als_esp_wr(sc, p->dma_stop);
        }
        ch->dma_active = 0;
        return active;
}
 
static int
alspchan_trigger(kobj_t obj, void *data, int go)
{
        struct  sc_chinfo *ch = data;
        struct sc_info *sc = ch->parent;
 
        if (!PCMTRIG_COMMON(go))
                return 0;
 
        snd_mtxlock(sc->lock);
        switch(go) {
        case PCMTRIG_START:
                als_playback_start(ch);
                break;
        case PCMTRIG_STOP:
        case PCMTRIG_ABORT:
                als_playback_stop(ch);
                break;
        default:
                break;
        }
        snd_mtxunlock(sc->lock);
        return 0;
}
 
static kobj_method_t alspchan_methods[] = {
        KOBJMETHOD(channel_init,                alschan_init),
        KOBJMETHOD(channel_setformat,           alschan_setformat),
        KOBJMETHOD(channel_setspeed,            alschan_setspeed),
        KOBJMETHOD(channel_setblocksize,        alschan_setblocksize),
        KOBJMETHOD(channel_trigger,             alspchan_trigger),
        KOBJMETHOD(channel_getptr,              alschan_getptr),
        KOBJMETHOD(channel_getcaps,             alschan_getcaps),
        KOBJMETHOD_END
};
CHANNEL_DECLARE(alspchan);
 
/* ------------------------------------------------------------------------- */
/* Capture channel implementation */
 
static u_int8_t
als_get_fifo_format(struct sc_info *sc, u_int32_t format)
{
        switch (format) {
        case SND_FORMAT(AFMT_U8, 1, 0):
                return ALS_FIFO1_8BIT;
        case SND_FORMAT(AFMT_U8, 2, 0):
                return ALS_FIFO1_8BIT | ALS_FIFO1_STEREO;
        case SND_FORMAT(AFMT_S16_LE, 1, 0):
                return ALS_FIFO1_SIGNED;
        case SND_FORMAT(AFMT_S16_LE, 2, 0):
                return ALS_FIFO1_SIGNED | ALS_FIFO1_STEREO;
        }
        device_printf(sc->dev, "format not found: 0x%08x\n", format);
        return ALS_FIFO1_8BIT;
}
 
static void
als_capture_start(struct sc_chinfo *ch)
{
        struct  sc_info *sc = ch->parent;
        u_int32_t       buf, bufsz, count, dma_prog;
 
        buf = sndbuf_getbufaddr(ch->buffer);
        bufsz = sndbuf_getsize(ch->buffer);
        count = bufsz / 2;
        if (ch->format & AFMT_16BIT)
                count /= 2;
        count--;
 
        als_esp_wr(sc, DSP_CMD_SPKON);
        als_set_speed(ch);
 
        als_gcr_wr(sc, ALS_GCR_FIFO1_START, buf);
        als_gcr_wr(sc, ALS_GCR_FIFO1_COUNT, (bufsz - 1));
 
        als_mix_wr(sc, ALS_FIFO1_LENGTH_LO, count & 0xff);
        als_mix_wr(sc, ALS_FIFO1_LENGTH_HI, count >> 8);
 
        dma_prog = ALS_FIFO1_RUN | als_get_fifo_format(sc, ch->format);
        als_mix_wr(sc, ALS_FIFO1_CONTROL, dma_prog);
 
        ch->dma_active = 1;
}
 
static int
als_capture_stop(struct sc_chinfo *ch)
{
        struct sc_info *sc = ch->parent;
        u_int32_t active;
 
        active = ch->dma_active;
        if (active) {
                als_mix_wr(sc, ALS_FIFO1_CONTROL, ALS_FIFO1_STOP);
        }
        ch->dma_active = 0;
        return active;
}
 
static int
alsrchan_trigger(kobj_t obj, void *data, int go)
{
        struct  sc_chinfo *ch = data;
        struct sc_info *sc = ch->parent;
 
        snd_mtxlock(sc->lock);
        switch(go) {
        case PCMTRIG_START:
                als_capture_start(ch);
                break;
        case PCMTRIG_STOP:
        case PCMTRIG_ABORT:
                als_capture_stop(ch);
                break;
        }
        snd_mtxunlock(sc->lock);
        return 0;
}
 
static kobj_method_t alsrchan_methods[] = {
        KOBJMETHOD(channel_init,                alschan_init),
        KOBJMETHOD(channel_setformat,           alschan_setformat),
        KOBJMETHOD(channel_setspeed,            alschan_setspeed),
        KOBJMETHOD(channel_setblocksize,        alschan_setblocksize),
        KOBJMETHOD(channel_trigger,             alsrchan_trigger),
        KOBJMETHOD(channel_getptr,              alschan_getptr),
        KOBJMETHOD(channel_getcaps,             alschan_getcaps),
        KOBJMETHOD_END
};
CHANNEL_DECLARE(alsrchan);
 
/* ------------------------------------------------------------------------- */
/* Mixer related */
 
/*
 * ALS4000 has an sb16 mixer, with some additional controls that we do
 * not yet a means to support.
 */
 
struct sb16props {
        u_int8_t lreg;
        u_int8_t rreg;
        u_int8_t bits;
        u_int8_t oselect;
        u_int8_t iselect; /* left input mask */
} static const amt[SOUND_MIXER_NRDEVICES] = {
        [SOUND_MIXER_VOLUME]  = { 0x30, 0x31, 5, 0x00, 0x00 },
        [SOUND_MIXER_PCM]     = { 0x32, 0x33, 5, 0x00, 0x00 },
        [SOUND_MIXER_SYNTH]   = { 0x34, 0x35, 5, 0x60, 0x40 },
        [SOUND_MIXER_CD]      = { 0x36, 0x37, 5, 0x06, 0x04 },
        [SOUND_MIXER_LINE]    = { 0x38, 0x39, 5, 0x18, 0x10 },
        [SOUND_MIXER_MIC]     = { 0x3a, 0x00, 5, 0x01, 0x01 },
        [SOUND_MIXER_SPEAKER] = { 0x3b, 0x00, 2, 0x00, 0x00 },
        [SOUND_MIXER_IGAIN]   = { 0x3f, 0x40, 2, 0x00, 0x00 },
        [SOUND_MIXER_OGAIN]   = { 0x41, 0x42, 2, 0x00, 0x00 },
        /* The following have register values but no h/w implementation */
        [SOUND_MIXER_TREBLE]  = { 0x44, 0x45, 4, 0x00, 0x00 },
        [SOUND_MIXER_BASS]    = { 0x46, 0x47, 4, 0x00, 0x00 }
};
 
static int
alsmix_init(struct snd_mixer *m)
{
        u_int32_t i, v;
 
        for (i = v = 0; i < SOUND_MIXER_NRDEVICES; i++) {
                if (amt[i].bits) v |= 1 << i;
        }
        mix_setdevs(m, v);
 
        for (i = v = 0; i < SOUND_MIXER_NRDEVICES; i++) {
                if (amt[i].iselect) v |= 1 << i;
        }
        mix_setrecdevs(m, v);
        return 0;
}
 
static int
alsmix_set(struct snd_mixer *m, unsigned dev, unsigned left, unsigned right)
{
        struct sc_info *sc = mix_getdevinfo(m);
        u_int32_t r, l, v, mask;
 
        /* Fill upper n bits in mask with 1's */
        mask = ((1 << amt[dev].bits) - 1) << (8 - amt[dev].bits);
 
        l = (left * mask / 100) & mask;
        v = als_mix_rd(sc, amt[dev].lreg) & ~mask;
        als_mix_wr(sc, amt[dev].lreg, l | v);
 
        if (amt[dev].rreg) {
                r = (right * mask / 100) & mask;
                v = als_mix_rd(sc, amt[dev].rreg) & ~mask;
                als_mix_wr(sc, amt[dev].rreg, r | v);
        } else {
                r = 0;
        }
 
        /* Zero gain does not mute channel from output, but this does. */
        v = als_mix_rd(sc, SB16_OMASK);
        if (l == 0 && r == 0) {
                v &= ~amt[dev].oselect;
        } else {
                v |= amt[dev].oselect;
        }
        als_mix_wr(sc, SB16_OMASK, v);
        return 0;
}
 
static u_int32_t
alsmix_setrecsrc(struct snd_mixer *m, u_int32_t src)
{
        struct sc_info *sc = mix_getdevinfo(m);
        u_int32_t i, l, r;
 
        for (i = l = r = 0; i < SOUND_MIXER_NRDEVICES; i++) {
                if (src & (1 << i)) {
                        if (amt[i].iselect == 1) {      /* microphone */
                                l |= amt[i].iselect;
                                r |= amt[i].iselect;
                        } else {
                                l |= amt[i].iselect;
                                r |= amt[i].iselect >> 1;
                        }
                }
        }
 
        als_mix_wr(sc, SB16_IMASK_L, l);
        als_mix_wr(sc, SB16_IMASK_R, r);
        return src;
}
 
static kobj_method_t als_mixer_methods[] = {
        KOBJMETHOD(mixer_init,          alsmix_init),
        KOBJMETHOD(mixer_set,           alsmix_set),
        KOBJMETHOD(mixer_setrecsrc,     alsmix_setrecsrc),
        KOBJMETHOD_END
};
MIXER_DECLARE(als_mixer);
 
/* ------------------------------------------------------------------------- */
/* Interrupt Handler */
 
static void
als_intr(void *p)
{
        struct sc_info *sc = (struct sc_info *)p;
        u_int8_t intr, sb_status;
 
        snd_mtxlock(sc->lock);
        intr = als_intr_rd(sc);
 
        if (intr & 0x80) {
                snd_mtxunlock(sc->lock);
                chn_intr(sc->pch.channel);
                snd_mtxlock(sc->lock);
        }
 
        if (intr & 0x40) {
                snd_mtxunlock(sc->lock);
                chn_intr(sc->rch.channel);
                snd_mtxlock(sc->lock);
        }
 
        /* ACK interrupt in PCI core */
        als_intr_wr(sc, intr);
 
        /* ACK interrupt in SB core */
        sb_status = als_mix_rd(sc, IRQ_STAT);
 
        if (sb_status & ALS_IRQ_STATUS8)
                als_ack_read(sc, ALS_ESP_RD_STATUS8);
        if (sb_status & ALS_IRQ_STATUS16)
                als_ack_read(sc, ALS_ESP_RD_STATUS16);
        if (sb_status & ALS_IRQ_MPUIN)
                als_ack_read(sc, ALS_MIDI_DATA);
        if (sb_status & ALS_IRQ_CR1E)
                als_ack_read(sc, ALS_CR1E_ACK_PORT);
 
        snd_mtxunlock(sc->lock);
        return;
}
 
/* ------------------------------------------------------------------------- */
/* H/W initialization */
 
static int
als_init(struct sc_info *sc)
{
        u_int32_t i, v;
 
        /* Reset Chip */
        if (als_esp_reset(sc)) {
                return 1;
        }
 
        /* Enable write on DMA_SETUP register */
        v = als_mix_rd(sc, ALS_SB16_CONFIG);
        als_mix_wr(sc, ALS_SB16_CONFIG, v | 0x80);
 
        /* Select DMA0 */
        als_mix_wr(sc, ALS_SB16_DMA_SETUP, 0x01);
 
        /* Disable write on DMA_SETUP register */
        als_mix_wr(sc, ALS_SB16_CONFIG, v & 0x7f);
 
        /* Enable interrupts */
        v  = als_gcr_rd(sc, ALS_GCR_MISC);
        als_gcr_wr(sc, ALS_GCR_MISC, v | 0x28000);
 
        /* Black out GCR DMA registers */
        for (i = 0x91; i <= 0x96; i++) {
                als_gcr_wr(sc, i, 0);
        }
 
        /* Emulation mode */
        v = als_gcr_rd(sc, ALS_GCR_DMA_EMULATION);
        als_gcr_wr(sc, ALS_GCR_DMA_EMULATION, v);
        DEB(printf("GCR_DMA_EMULATION 0x%08x\n", v));
        return 0;
}
 
static void
als_uninit(struct sc_info *sc)
{
        /* Disable interrupts */
        als_gcr_wr(sc, ALS_GCR_MISC, 0);
}
 
/* ------------------------------------------------------------------------- */
/* Probe and attach card */
 
static int
als_pci_probe(device_t dev)
{
        if (pci_get_devid(dev) == ALS_PCI_ID0) {
                device_set_desc(dev, "Avance Logic ALS4000");
                return BUS_PROBE_DEFAULT;
        }
        return ENXIO;
}
 
static void
als_resource_free(device_t dev, struct sc_info *sc)
{
        if (sc->reg) {
                bus_release_resource(dev, SYS_RES_IOPORT, sc->regid, sc->reg);
                sc->reg = NULL;
        }
        if (sc->ih) {
                bus_teardown_intr(dev, sc->irq, sc->ih);
                sc->ih = NULL;
        }
        if (sc->irq) {
                bus_release_resource(dev, SYS_RES_IRQ, sc->irqid, sc->irq);
                sc->irq = NULL;
        }
        if (sc->parent_dmat) {
                bus_dma_tag_destroy(sc->parent_dmat);
                sc->parent_dmat = 0;
        }
        if (sc->lock) {
                snd_mtxfree(sc->lock);
                sc->lock = NULL;
        }
}
 
static int
als_resource_grab(device_t dev, struct sc_info *sc)
{
        sc->regid = PCIR_BAR(0);
        sc->reg = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &sc->regid,
                                         RF_ACTIVE);
        if (sc->reg == NULL) {
                device_printf(dev, "unable to allocate register space\n");
                goto bad;
        }
        sc->st = rman_get_bustag(sc->reg);
        sc->sh = rman_get_bushandle(sc->reg);
 
        sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irqid,
                                         RF_ACTIVE | RF_SHAREABLE);
        if (sc->irq == NULL) {
                device_printf(dev, "unable to allocate interrupt\n");
                goto bad;
        }
 
        if (snd_setup_intr(dev, sc->irq, INTR_MPSAFE, als_intr,
                           sc, &sc->ih)) {
                device_printf(dev, "unable to setup interrupt\n");
                goto bad;
        }
 
        sc->bufsz = pcm_getbuffersize(dev, 4096, ALS_DEFAULT_BUFSZ, 65536);
 
        if (bus_dma_tag_create(/*parent*/bus_get_dma_tag(dev),
                               /*alignment*/2, /*boundary*/0,
                               /*lowaddr*/BUS_SPACE_MAXADDR_24BIT,
                               /*highaddr*/BUS_SPACE_MAXADDR,
                               /*filter*/NULL, /*filterarg*/NULL,
                               /*maxsize*/sc->bufsz,
                               /*nsegments*/1, /*maxsegz*/0x3ffff,
                               /*flags*/0, /*lockfunc*/NULL,
                               /*lockarg*/NULL, &sc->parent_dmat) != 0) {
                device_printf(dev, "unable to create dma tag\n");
                goto bad;
        }
        return 0;
 bad:
        als_resource_free(dev, sc);
        return ENXIO;
}
 
static int
als_pci_attach(device_t dev)
{
        struct sc_info *sc;
        char status[SND_STATUSLEN];
 
        sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK | M_ZERO);
        sc->lock = snd_mtxcreate(device_get_nameunit(dev), "snd_als4000 softc");
        sc->dev = dev;
 
        pci_enable_busmaster(dev);
        /*
         * By default the power to the various components on the
         * ALS4000 is entirely controlled by the pci powerstate.  We
         * could attempt finer grained control by setting GCR6.31.
         */
        if (pci_get_powerstate(dev) != PCI_POWERSTATE_D0) {
                /* Reset the power state. */
                device_printf(dev, "chip is in D%d power mode "
                              "-- setting to D0\n", pci_get_powerstate(dev));
                pci_set_powerstate(dev, PCI_POWERSTATE_D0);
        }
 
        if (als_resource_grab(dev, sc)) {
                device_printf(dev, "failed to allocate resources\n");
                goto bad_attach;
        }
 
        if (als_init(sc)) {
                device_printf(dev, "failed to initialize hardware\n");
                goto bad_attach;
        }
 
        if (mixer_init(dev, &als_mixer_class, sc)) {
                device_printf(dev, "failed to initialize mixer\n");
                goto bad_attach;
        }
 
        if (pcm_register(dev, sc, 1, 1)) {
                device_printf(dev, "failed to register pcm entries\n");
                goto bad_attach;
        }
 
        pcm_addchan(dev, PCMDIR_PLAY, &alspchan_class, sc);
        pcm_addchan(dev, PCMDIR_REC,  &alsrchan_class, sc);
 
        snprintf(status, SND_STATUSLEN, "at io 0x%jx irq %jd %s",
                 rman_get_start(sc->reg), rman_get_start(sc->irq),PCM_KLDSTRING(snd_als4000));
        pcm_setstatus(dev, status);
        return 0;
 
 bad_attach:
        als_resource_free(dev, sc);
        free(sc, M_DEVBUF);
        return ENXIO;
}
 
static int
als_pci_detach(device_t dev)
{
        struct sc_info *sc;
        int r;
 
        r = pcm_unregister(dev);
        if (r)
                return r;
 
        sc = pcm_getdevinfo(dev);
        als_uninit(sc);
        als_resource_free(dev, sc);
        free(sc, M_DEVBUF);
        return 0;
}
 
static int
als_pci_suspend(device_t dev)
{
        struct sc_info *sc = pcm_getdevinfo(dev);
 
        snd_mtxlock(sc->lock);
        sc->pch.dma_was_active = als_playback_stop(&sc->pch);
        sc->rch.dma_was_active = als_capture_stop(&sc->rch);
        als_uninit(sc);
        snd_mtxunlock(sc->lock);
        return 0;
}
 
static int
als_pci_resume(device_t dev)
{
        struct sc_info *sc = pcm_getdevinfo(dev);
 
        snd_mtxlock(sc->lock);
        if (als_init(sc) != 0) {
                device_printf(dev, "unable to reinitialize the card\n");
                snd_mtxunlock(sc->lock);
                return ENXIO;
        }
 
        if (mixer_reinit(dev) != 0) {
                device_printf(dev, "unable to reinitialize the mixer\n");
                snd_mtxunlock(sc->lock);
                return ENXIO;
        }
 
        if (sc->pch.dma_was_active) {
                als_playback_start(&sc->pch);
        }
 
        if (sc->rch.dma_was_active) {
                als_capture_start(&sc->rch);
        }
        snd_mtxunlock(sc->lock);
 
        return 0;
}
 
static device_method_t als_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,         als_pci_probe),
        DEVMETHOD(device_attach,        als_pci_attach),
        DEVMETHOD(device_detach,        als_pci_detach),
        DEVMETHOD(device_suspend,       als_pci_suspend),
        DEVMETHOD(device_resume,        als_pci_resume),
        { 0, 0 }
};
 
static driver_t als_driver = {
        "pcm",
        als_methods,
        PCM_SOFTC_SIZE,
};
 
DRIVER_MODULE(snd_als4000, pci, als_driver, pcm_devclass, 0, 0);
MODULE_DEPEND(snd_als4000, sound, SOUND_MINVER, SOUND_PREFVER, SOUND_MAXVER);
MODULE_VERSION(snd_als4000, 1);