atiixp.c

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2005 Ariff Abdullah <ariff@FreeBSD.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.
 */
 
/*
 * FreeBSD pcm driver for ATI IXP 150/200/250/300 AC97 controllers
 *
 * Features
 *      * 16bit playback / recording
 *      * 32bit native playback - yay!
 *      * 32bit native recording (seems broken on few hardwares)
 *
 * Issues / TODO:
 *      * SPDIF
 *      * Support for more than 2 channels.
 *      * VRA ? VRM ? DRA ?
 *      * 32bit native recording seems broken on few hardwares, most
 *        probably because of incomplete VRA/DRA cleanup.
 *
 *
 * Thanks goes to:
 *
 *   Shaharil @ SCAN Associates whom relentlessly providing me the
 *   mind blowing Acer Ferrari 4002 WLMi with this ATI IXP hardware.
 *
 *   Reinoud Zandijk <reinoud@NetBSD.org> (auixp), which this driver is
 *   largely based upon although large part of it has been reworked. His
 *   driver is the primary reference and pretty much well documented.
 *
 *   Takashi Iwai (ALSA snd-atiixp), for register definitions and some
 *   random ninja hackery.
 */
 
#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_snd.h"
#endif
 
#include <dev/sound/pcm/sound.h>
#include <dev/sound/pcm/ac97.h>
 
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <sys/sysctl.h>
#include <sys/endian.h>
 
#include <dev/sound/pci/atiixp.h>
 
SND_DECLARE_FILE("$FreeBSD$");
 
#define ATI_IXP_DMA_RETRY_MAX   100
 
#define ATI_IXP_BUFSZ_MIN       4096
#define ATI_IXP_BUFSZ_MAX       65536
#define ATI_IXP_BUFSZ_DEFAULT   16384
 
#define ATI_IXP_BLK_MIN         32
#define ATI_IXP_BLK_ALIGN       (~(ATI_IXP_BLK_MIN - 1))
 
#define ATI_IXP_CHN_RUNNING     0x00000001
#define ATI_IXP_CHN_SUSPEND     0x00000002
 
struct atiixp_dma_op {
        volatile uint32_t addr;
        volatile uint16_t status;
        volatile uint16_t size;
        volatile uint32_t next;
};
 
struct atiixp_info;
 
struct atiixp_chinfo {
        struct snd_dbuf *buffer;
        struct pcm_channel *channel;
        struct atiixp_info *parent;
        struct atiixp_dma_op *sgd_table;
        bus_addr_t sgd_addr;
        uint32_t enable_bit, flush_bit, linkptr_bit, dt_cur_bit;
        uint32_t blksz, blkcnt;
        uint32_t ptr, prevptr;
        uint32_t fmt;
        uint32_t flags;
        int caps_32bit, dir;
};
 
struct atiixp_info {
        device_t dev;
 
        bus_space_tag_t st;
        bus_space_handle_t sh;
        bus_dma_tag_t parent_dmat;
        bus_dma_tag_t sgd_dmat;
        bus_dmamap_t sgd_dmamap;
        bus_addr_t sgd_addr;
 
        struct resource *reg, *irq;
        int regtype, regid, irqid;
        void *ih;
        struct ac97_info *codec;
 
        struct atiixp_chinfo pch;
        struct atiixp_chinfo rch;
        struct atiixp_dma_op *sgd_table;
        struct intr_config_hook delayed_attach;
 
        uint32_t bufsz;
        uint32_t codec_not_ready_bits, codec_idx, codec_found;
        uint32_t blkcnt;
        int registered_channels;
 
        struct mtx *lock;
        struct callout poll_timer;
        int poll_ticks, polling;
};
 
#define atiixp_rd(_sc, _reg)    \
                bus_space_read_4((_sc)->st, (_sc)->sh, _reg)
#define atiixp_wr(_sc, _reg, _val)      \
                bus_space_write_4((_sc)->st, (_sc)->sh, _reg, _val)
 
#define atiixp_lock(_sc)        snd_mtxlock((_sc)->lock)
#define atiixp_unlock(_sc)      snd_mtxunlock((_sc)->lock)
#define atiixp_assert(_sc)      snd_mtxassert((_sc)->lock)
 
static uint32_t atiixp_fmt_32bit[] = {
        SND_FORMAT(AFMT_S16_LE, 2, 0),
        SND_FORMAT(AFMT_S32_LE, 2, 0),
        0
};
 
static uint32_t atiixp_fmt[] = {
        SND_FORMAT(AFMT_S16_LE, 2, 0),
        0
};
 
static struct pcmchan_caps atiixp_caps_32bit = {
        ATI_IXP_BASE_RATE,
        ATI_IXP_BASE_RATE,
        atiixp_fmt_32bit, 0
};
 
static struct pcmchan_caps atiixp_caps = {
        ATI_IXP_BASE_RATE,
        ATI_IXP_BASE_RATE,
        atiixp_fmt, 0
};
 
static const struct {
        uint16_t vendor;
        uint16_t devid;
        char     *desc;
} atiixp_hw[] = {
        { ATI_VENDOR_ID, ATI_IXP_200_ID, "ATI IXP 200" },
        { ATI_VENDOR_ID, ATI_IXP_300_ID, "ATI IXP 300" },
        { ATI_VENDOR_ID, ATI_IXP_400_ID, "ATI IXP 400" },
        { ATI_VENDOR_ID, ATI_IXP_SB600_ID, "ATI IXP SB600" },
};
 
static void atiixp_enable_interrupts(struct atiixp_info *);
static void atiixp_disable_interrupts(struct atiixp_info *);
static void atiixp_reset_aclink(struct atiixp_info *);
static void atiixp_flush_dma(struct atiixp_chinfo *);
static void atiixp_enable_dma(struct atiixp_chinfo *);
static void atiixp_disable_dma(struct atiixp_chinfo *);
 
static int atiixp_waitready_codec(struct atiixp_info *);
static int atiixp_rdcd(kobj_t, void *, int);
static int atiixp_wrcd(kobj_t, void *, int, uint32_t);
 
static void  *atiixp_chan_init(kobj_t, void *, struct snd_dbuf *,
                                                struct pcm_channel *, int);
static int    atiixp_chan_setformat(kobj_t, void *, uint32_t);
static uint32_t    atiixp_chan_setspeed(kobj_t, void *, uint32_t);
static int         atiixp_chan_setfragments(kobj_t, void *, uint32_t, uint32_t);
static uint32_t    atiixp_chan_setblocksize(kobj_t, void *, uint32_t);
static void   atiixp_buildsgdt(struct atiixp_chinfo *);
static int    atiixp_chan_trigger(kobj_t, void *, int);
static __inline uint32_t atiixp_dmapos(struct atiixp_chinfo *);
static uint32_t          atiixp_chan_getptr(kobj_t, void *);
static struct pcmchan_caps *atiixp_chan_getcaps(kobj_t, void *);
 
static void atiixp_intr(void *);
static void atiixp_dma_cb(void *, bus_dma_segment_t *, int, int);
static void atiixp_chip_pre_init(struct atiixp_info *);
static void atiixp_chip_post_init(void *);
static void atiixp_release_resource(struct atiixp_info *);
static int  atiixp_pci_probe(device_t);
static int  atiixp_pci_attach(device_t);
static int  atiixp_pci_detach(device_t);
static int  atiixp_pci_suspend(device_t);
static int  atiixp_pci_resume(device_t);
 
/*
 * ATI IXP helper functions
 */
static void
atiixp_enable_interrupts(struct atiixp_info *sc)
{
        uint32_t value;
 
        /* clear all pending */
        atiixp_wr(sc, ATI_REG_ISR, 0xffffffff);
 
        /* enable all relevant interrupt sources we can handle */
        value = atiixp_rd(sc, ATI_REG_IER);
 
        value |= ATI_REG_IER_IO_STATUS_EN;
 
        /*
         * Disable / ignore internal xrun/spdf interrupt flags
         * since it doesn't interest us (for now).
         */
#if 1
        value &= ~(ATI_REG_IER_IN_XRUN_EN | ATI_REG_IER_OUT_XRUN_EN |
            ATI_REG_IER_SPDF_XRUN_EN | ATI_REG_IER_SPDF_STATUS_EN);
#else
        value |= ATI_REG_IER_IN_XRUN_EN;
        value |= ATI_REG_IER_OUT_XRUN_EN;
 
        value |= ATI_REG_IER_SPDF_XRUN_EN;
        value |= ATI_REG_IER_SPDF_STATUS_EN;
#endif
 
        atiixp_wr(sc, ATI_REG_IER, value);
}
 
static void
atiixp_disable_interrupts(struct atiixp_info *sc)
{
        /* disable all interrupt sources */
        atiixp_wr(sc, ATI_REG_IER, 0);
 
        /* clear all pending */
        atiixp_wr(sc, ATI_REG_ISR, 0xffffffff);
}
 
static void
atiixp_reset_aclink(struct atiixp_info *sc)
{
        uint32_t value, timeout;
 
        /* if power is down, power it up */
        value = atiixp_rd(sc, ATI_REG_CMD);
        if (value & ATI_REG_CMD_POWERDOWN) {
                /* explicitly enable power */
                value &= ~ATI_REG_CMD_POWERDOWN;
                atiixp_wr(sc, ATI_REG_CMD, value);
 
                /* have to wait at least 10 usec for it to initialise */
                DELAY(20);
        }
 
        /* perform a soft reset */
        value  = atiixp_rd(sc, ATI_REG_CMD);
        value |= ATI_REG_CMD_AC_SOFT_RESET;
        atiixp_wr(sc, ATI_REG_CMD, value);
 
        /* need to read the CMD reg and wait aprox. 10 usec to init */
        value  = atiixp_rd(sc, ATI_REG_CMD);
        DELAY(20);
 
        /* clear soft reset flag again */
        value  = atiixp_rd(sc, ATI_REG_CMD);
        value &= ~ATI_REG_CMD_AC_SOFT_RESET;
        atiixp_wr(sc, ATI_REG_CMD, value);
 
        /* check if the ac-link is working; reset device otherwise */
        timeout = 10;
        value = atiixp_rd(sc, ATI_REG_CMD);
        while (!(value & ATI_REG_CMD_ACLINK_ACTIVE) && --timeout) {
#if 0
                device_printf(sc->dev, "not up; resetting aclink hardware\n");
#endif
 
                /* dip aclink reset but keep the acsync */
                value &= ~ATI_REG_CMD_AC_RESET;
                value |=  ATI_REG_CMD_AC_SYNC;
                atiixp_wr(sc, ATI_REG_CMD, value);
 
                /* need to read CMD again and wait again (clocking in issue?) */
                value = atiixp_rd(sc, ATI_REG_CMD);
                DELAY(20);
 
                /* assert aclink reset again */
                value = atiixp_rd(sc, ATI_REG_CMD);
                value |=  ATI_REG_CMD_AC_RESET;
                atiixp_wr(sc, ATI_REG_CMD, value);
 
                /* check if its active now */
                value = atiixp_rd(sc, ATI_REG_CMD);
        }
 
        if (timeout == 0)
                device_printf(sc->dev, "giving up aclink reset\n");
#if 0
        if (timeout != 10)
                device_printf(sc->dev, "aclink hardware reset successful\n");
#endif
 
        /* assert reset and sync for safety */
        value  = atiixp_rd(sc, ATI_REG_CMD);
        value |= ATI_REG_CMD_AC_SYNC | ATI_REG_CMD_AC_RESET;
        atiixp_wr(sc, ATI_REG_CMD, value);
}
 
static void
atiixp_flush_dma(struct atiixp_chinfo *ch)
{
        atiixp_wr(ch->parent, ATI_REG_FIFO_FLUSH, ch->flush_bit);
}
 
static void
atiixp_enable_dma(struct atiixp_chinfo *ch)
{
        uint32_t value;
 
        value = atiixp_rd(ch->parent, ATI_REG_CMD);
        if (!(value & ch->enable_bit)) {
                value |= ch->enable_bit;
                atiixp_wr(ch->parent, ATI_REG_CMD, value);
        }
}
 
static void
atiixp_disable_dma(struct atiixp_chinfo *ch)
{
        uint32_t value;
 
        value = atiixp_rd(ch->parent, ATI_REG_CMD);
        if (value & ch->enable_bit) {
                value &= ~ch->enable_bit;
                atiixp_wr(ch->parent, ATI_REG_CMD, value);
        }
}
 
/*
 * AC97 interface
 */
static int
atiixp_waitready_codec(struct atiixp_info *sc)
{
        int timeout = 500;
 
        do {
                if ((atiixp_rd(sc, ATI_REG_PHYS_OUT_ADDR) &
                    ATI_REG_PHYS_OUT_ADDR_EN) == 0)
                        return (0);
                DELAY(1);
        } while (--timeout);
 
        return (-1);
}
 
static int
atiixp_rdcd(kobj_t obj, void *devinfo, int reg)
{
        struct atiixp_info *sc = devinfo;
        uint32_t data;
        int timeout;
 
        if (atiixp_waitready_codec(sc))
                return (-1);
 
        data = (reg << ATI_REG_PHYS_OUT_ADDR_SHIFT) |
            ATI_REG_PHYS_OUT_ADDR_EN | ATI_REG_PHYS_OUT_RW | sc->codec_idx;
 
        atiixp_wr(sc, ATI_REG_PHYS_OUT_ADDR, data);
 
        if (atiixp_waitready_codec(sc))
                return (-1);
 
        timeout = 500;
        do {
                data = atiixp_rd(sc, ATI_REG_PHYS_IN_ADDR);
                if (data & ATI_REG_PHYS_IN_READ_FLAG)
                        return (data >> ATI_REG_PHYS_IN_DATA_SHIFT);
                DELAY(1);
        } while (--timeout);
 
        if (reg < 0x7c)
                device_printf(sc->dev, "codec read timeout! (reg 0x%x)\n", reg);
 
        return (-1);
}
 
static int
atiixp_wrcd(kobj_t obj, void *devinfo, int reg, uint32_t data)
{
        struct atiixp_info *sc = devinfo;
 
        if (atiixp_waitready_codec(sc))
                return (-1);
 
        data = (data << ATI_REG_PHYS_OUT_DATA_SHIFT) |
            (((uint32_t)reg) << ATI_REG_PHYS_OUT_ADDR_SHIFT) |
            ATI_REG_PHYS_OUT_ADDR_EN | sc->codec_idx;
 
        atiixp_wr(sc, ATI_REG_PHYS_OUT_ADDR, data);
 
        return (0);
}
 
static kobj_method_t atiixp_ac97_methods[] = {
        KOBJMETHOD(ac97_read,           atiixp_rdcd),
        KOBJMETHOD(ac97_write,          atiixp_wrcd),
        KOBJMETHOD_END
};
AC97_DECLARE(atiixp_ac97);
 
/*
 * Playback / Record channel interface
 */
static void *
atiixp_chan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b,
                                        struct pcm_channel *c, int dir)
{
        struct atiixp_info *sc = devinfo;
        struct atiixp_chinfo *ch;
        int num;
 
        atiixp_lock(sc);
 
        if (dir == PCMDIR_PLAY) {
                ch = &sc->pch;
                ch->linkptr_bit = ATI_REG_OUT_DMA_LINKPTR;
                ch->enable_bit = ATI_REG_CMD_OUT_DMA_EN | ATI_REG_CMD_SEND_EN;
                ch->flush_bit = ATI_REG_FIFO_OUT_FLUSH;
                ch->dt_cur_bit = ATI_REG_OUT_DMA_DT_CUR;
                /* Native 32bit playback working properly */
                ch->caps_32bit = 1;
        } else {
                ch = &sc->rch;
                ch->linkptr_bit = ATI_REG_IN_DMA_LINKPTR;
                ch->enable_bit = ATI_REG_CMD_IN_DMA_EN | ATI_REG_CMD_RECEIVE_EN;
                ch->flush_bit = ATI_REG_FIFO_IN_FLUSH;
                ch->dt_cur_bit = ATI_REG_IN_DMA_DT_CUR;
                /* XXX Native 32bit recording appear to be broken */
                ch->caps_32bit = 1;
        }
 
        ch->buffer = b;
        ch->parent = sc;
        ch->channel = c;
        ch->dir = dir;
        ch->blkcnt = sc->blkcnt;
        ch->blksz = sc->bufsz / ch->blkcnt;
 
        atiixp_unlock(sc);
 
        if (sndbuf_alloc(ch->buffer, sc->parent_dmat, 0, sc->bufsz) == -1)
                return (NULL);
 
        atiixp_lock(sc);
        num = sc->registered_channels++;
        ch->sgd_table = &sc->sgd_table[num * ATI_IXP_DMA_CHSEGS_MAX];
        ch->sgd_addr = sc->sgd_addr + (num * ATI_IXP_DMA_CHSEGS_MAX *
            sizeof(struct atiixp_dma_op));
        atiixp_disable_dma(ch);
        atiixp_unlock(sc);
 
        return (ch);
}
 
static int
atiixp_chan_setformat(kobj_t obj, void *data, uint32_t format)
{
        struct atiixp_chinfo *ch = data;
        struct atiixp_info *sc = ch->parent;
        uint32_t value;
 
        atiixp_lock(sc);
        if (ch->dir == PCMDIR_REC) {
                value = atiixp_rd(sc, ATI_REG_CMD);
                value &= ~ATI_REG_CMD_INTERLEAVE_IN;
                if ((format & AFMT_32BIT) == 0)
                        value |= ATI_REG_CMD_INTERLEAVE_IN;
                atiixp_wr(sc, ATI_REG_CMD, value);
        } else {
                value = atiixp_rd(sc, ATI_REG_OUT_DMA_SLOT);
                value &= ~ATI_REG_OUT_DMA_SLOT_MASK;
                /* We do not have support for more than 2 channels, _yet_. */
                value |= ATI_REG_OUT_DMA_SLOT_BIT(3) |
                    ATI_REG_OUT_DMA_SLOT_BIT(4);
                value |= 0x04 << ATI_REG_OUT_DMA_THRESHOLD_SHIFT;
                atiixp_wr(sc, ATI_REG_OUT_DMA_SLOT, value);
                value = atiixp_rd(sc, ATI_REG_CMD);
                value &= ~ATI_REG_CMD_INTERLEAVE_OUT;
                if ((format & AFMT_32BIT) == 0)
                        value |= ATI_REG_CMD_INTERLEAVE_OUT;
                atiixp_wr(sc, ATI_REG_CMD, value);
                value = atiixp_rd(sc, ATI_REG_6CH_REORDER);
                value &= ~ATI_REG_6CH_REORDER_EN;
                atiixp_wr(sc, ATI_REG_6CH_REORDER, value);
        }
        ch->fmt = format;
        atiixp_unlock(sc);
 
        return (0);
}
 
static uint32_t
atiixp_chan_setspeed(kobj_t obj, void *data, uint32_t spd)
{
        /* XXX We're supposed to do VRA/DRA processing right here */
        return (ATI_IXP_BASE_RATE);
}
 
static int
atiixp_chan_setfragments(kobj_t obj, void *data,
                                        uint32_t blksz, uint32_t blkcnt)
{
        struct atiixp_chinfo *ch = data;
        struct atiixp_info *sc = ch->parent;
 
        blksz &= ATI_IXP_BLK_ALIGN;
 
        if (blksz > (sndbuf_getmaxsize(ch->buffer) / ATI_IXP_DMA_CHSEGS_MIN))
                blksz = sndbuf_getmaxsize(ch->buffer) / ATI_IXP_DMA_CHSEGS_MIN;
        if (blksz < ATI_IXP_BLK_MIN)
                blksz = ATI_IXP_BLK_MIN;
        if (blkcnt > ATI_IXP_DMA_CHSEGS_MAX)
                blkcnt = ATI_IXP_DMA_CHSEGS_MAX;
        if (blkcnt < ATI_IXP_DMA_CHSEGS_MIN)
                blkcnt = ATI_IXP_DMA_CHSEGS_MIN;
 
        while ((blksz * blkcnt) > sndbuf_getmaxsize(ch->buffer)) {
                if ((blkcnt >> 1) >= ATI_IXP_DMA_CHSEGS_MIN)
                        blkcnt >>= 1;
                else if ((blksz >> 1) >= ATI_IXP_BLK_MIN)
                        blksz >>= 1;
                else
                        break;
        }
 
        if ((sndbuf_getblksz(ch->buffer) != blksz ||
            sndbuf_getblkcnt(ch->buffer) != blkcnt) &&
            sndbuf_resize(ch->buffer, blkcnt, blksz) != 0)
                device_printf(sc->dev, "%s: failed blksz=%u blkcnt=%u\n",
                    __func__, blksz, blkcnt);
 
        ch->blksz = sndbuf_getblksz(ch->buffer);
        ch->blkcnt = sndbuf_getblkcnt(ch->buffer);
 
        return (0);
}
 
static uint32_t
atiixp_chan_setblocksize(kobj_t obj, void *data, uint32_t blksz)
{
        struct atiixp_chinfo *ch = data;
        struct atiixp_info *sc = ch->parent;
 
        atiixp_chan_setfragments(obj, data, blksz, sc->blkcnt);
 
        return (ch->blksz);
}
 
static void
atiixp_buildsgdt(struct atiixp_chinfo *ch)
{
        struct atiixp_info *sc = ch->parent;
        uint32_t addr, blksz, blkcnt;
        int i;
 
        addr = sndbuf_getbufaddr(ch->buffer);
 
        if (sc->polling != 0) {
                blksz = ch->blksz * ch->blkcnt;
                blkcnt = 1;
        } else {
                blksz = ch->blksz;
                blkcnt = ch->blkcnt;
        }
 
        for (i = 0; i < blkcnt; i++) {
                ch->sgd_table[i].addr = htole32(addr + (i * blksz));
                ch->sgd_table[i].status = htole16(0);
                ch->sgd_table[i].size = htole16(blksz >> 2);
                ch->sgd_table[i].next = htole32((uint32_t)ch->sgd_addr +
                    (((i + 1) % blkcnt) * sizeof(struct atiixp_dma_op)));
        }
}
 
static __inline uint32_t
atiixp_dmapos(struct atiixp_chinfo *ch)
{
        struct atiixp_info *sc = ch->parent;
        uint32_t reg, addr, sz, retry;
        volatile uint32_t ptr;
 
        reg = ch->dt_cur_bit;
        addr = sndbuf_getbufaddr(ch->buffer);
        sz = ch->blkcnt * ch->blksz;
        retry = ATI_IXP_DMA_RETRY_MAX;
 
        do {
                ptr = atiixp_rd(sc, reg);
                if (ptr < addr)
                        continue;
                ptr -= addr;
                if (ptr < sz) {
#if 0
#ifdef ATI_IXP_DEBUG
                        if ((ptr & ~(ch->blksz - 1)) != ch->ptr) {
                                uint32_t delta;
 
                                delta = (sz + ptr - ch->prevptr) % sz;
#ifndef ATI_IXP_DEBUG_VERBOSE
                                if (delta < ch->blksz)
#endif
                                        device_printf(sc->dev,
                                                "PCMDIR_%s: incoherent DMA "
                                                "prevptr=%u ptr=%u "
                                                "ptr=%u blkcnt=%u "
                                                "[delta=%u != blksz=%u] "
                                                "(%s)\n",
                                                (ch->dir == PCMDIR_PLAY) ?
                                                "PLAY" : "REC",
                                                ch->prevptr, ptr,
                                                ch->ptr, ch->blkcnt,
                                                delta, ch->blksz,
                                                (delta < ch->blksz) ?
                                                "OVERLAPPED!" : "Ok");
                                ch->ptr = ptr & ~(ch->blksz - 1);
                        }
                        ch->prevptr = ptr;
#endif
#endif
                        return (ptr);
                }
        } while (--retry);
 
        device_printf(sc->dev, "PCMDIR_%s: invalid DMA pointer ptr=%u\n",
            (ch->dir == PCMDIR_PLAY) ? "PLAY" : "REC", ptr);
 
        return (0);
}
 
static __inline int
atiixp_poll_channel(struct atiixp_chinfo *ch)
{
        uint32_t sz, delta;
        volatile uint32_t ptr;
 
        if (!(ch->flags & ATI_IXP_CHN_RUNNING))
                return (0);
 
        sz = ch->blksz * ch->blkcnt;
        ptr = atiixp_dmapos(ch);
        ch->ptr = ptr;
        ptr %= sz;
        ptr &= ~(ch->blksz - 1);
        delta = (sz + ptr - ch->prevptr) % sz;
 
        if (delta < ch->blksz)
                return (0);
 
        ch->prevptr = ptr;
 
        return (1);
}
 
#define atiixp_chan_active(sc)  (((sc)->pch.flags | (sc)->rch.flags) &  \
                                 ATI_IXP_CHN_RUNNING)
 
static void
atiixp_poll_callback(void *arg)
{
        struct atiixp_info *sc = arg;
        uint32_t trigger = 0;
 
        if (sc == NULL)
                return;
 
        atiixp_lock(sc);
        if (sc->polling == 0 || atiixp_chan_active(sc) == 0) {
                atiixp_unlock(sc);
                return;
        }
 
        trigger |= (atiixp_poll_channel(&sc->pch) != 0) ? 1 : 0;
        trigger |= (atiixp_poll_channel(&sc->rch) != 0) ? 2 : 0;
 
        /* XXX */
        callout_reset(&sc->poll_timer, 1/*sc->poll_ticks*/,
            atiixp_poll_callback, sc);
 
        atiixp_unlock(sc);
 
        if (trigger & 1)
                chn_intr(sc->pch.channel);
        if (trigger & 2)
                chn_intr(sc->rch.channel);
}
 
static int
atiixp_chan_trigger(kobj_t obj, void *data, int go)
{
        struct atiixp_chinfo *ch = data;
        struct atiixp_info *sc = ch->parent;
        uint32_t value;
        int pollticks;
 
        if (!PCMTRIG_COMMON(go))
                return (0);
 
        atiixp_lock(sc);
 
        switch (go) {
        case PCMTRIG_START:
                atiixp_flush_dma(ch);
                atiixp_buildsgdt(ch);
                atiixp_wr(sc, ch->linkptr_bit, 0);
                atiixp_enable_dma(ch);
                atiixp_wr(sc, ch->linkptr_bit,
                    (uint32_t)ch->sgd_addr | ATI_REG_LINKPTR_EN);
                if (sc->polling != 0) {
                        ch->ptr = 0;
                        ch->prevptr = 0;
                        pollticks = ((uint64_t)hz * ch->blksz) /
                            ((uint64_t)sndbuf_getalign(ch->buffer) *
                            sndbuf_getspd(ch->buffer));
                        pollticks >>= 2;
                        if (pollticks > hz)
                                pollticks = hz;
                        if (pollticks < 1)
                                pollticks = 1;
                        if (atiixp_chan_active(sc) == 0 ||
                            pollticks < sc->poll_ticks) {
                                if (bootverbose) {
                                        if (atiixp_chan_active(sc) == 0)
                                                device_printf(sc->dev,
                                                    "%s: pollticks=%d\n",
                                                    __func__, pollticks);
                                        else
                                                device_printf(sc->dev,
                                                    "%s: pollticks %d -> %d\n",
                                                    __func__, sc->poll_ticks,
                                                    pollticks);
                                }
                                sc->poll_ticks = pollticks;
                                callout_reset(&sc->poll_timer, 1,
                                    atiixp_poll_callback, sc);
                        }
                }
                ch->flags |= ATI_IXP_CHN_RUNNING;
                break;
        case PCMTRIG_STOP:
        case PCMTRIG_ABORT:
                atiixp_disable_dma(ch);
                atiixp_flush_dma(ch);
                ch->flags &= ~ATI_IXP_CHN_RUNNING;
                if (sc->polling != 0) {
                        if (atiixp_chan_active(sc) == 0) {
                                callout_stop(&sc->poll_timer);
                                sc->poll_ticks = 1;
                        } else {
                                if (sc->pch.flags & ATI_IXP_CHN_RUNNING)
                                        ch = &sc->pch;
                                else
                                        ch = &sc->rch;
                                pollticks = ((uint64_t)hz * ch->blksz) /
                                    ((uint64_t)sndbuf_getalign(ch->buffer) *
                                    sndbuf_getspd(ch->buffer));
                                pollticks >>= 2;
                                if (pollticks > hz)
                                        pollticks = hz;
                                if (pollticks < 1)
                                        pollticks = 1;
                                if (pollticks > sc->poll_ticks) {
                                        if (bootverbose)
                                                device_printf(sc->dev,
                                                    "%s: pollticks %d -> %d\n",
                                                    __func__, sc->poll_ticks,
                                                    pollticks);
                                        sc->poll_ticks = pollticks;
                                        callout_reset(&sc->poll_timer,
                                            1, atiixp_poll_callback,
                                            sc);
                                }
                        }
                }
                break;
        default:
                atiixp_unlock(sc);
                return (0);
                break;
        }
 
        /* Update bus busy status */
        value = atiixp_rd(sc, ATI_REG_IER);
        if (atiixp_rd(sc, ATI_REG_CMD) & (ATI_REG_CMD_SEND_EN |
            ATI_REG_CMD_RECEIVE_EN | ATI_REG_CMD_SPDF_OUT_EN))
                value |= ATI_REG_IER_SET_BUS_BUSY;
        else
                value &= ~ATI_REG_IER_SET_BUS_BUSY;
        atiixp_wr(sc, ATI_REG_IER, value);
 
        atiixp_unlock(sc);
 
        return (0);
}
 
static uint32_t
atiixp_chan_getptr(kobj_t obj, void *data)
{
        struct atiixp_chinfo *ch = data;
        struct atiixp_info *sc = ch->parent;
        uint32_t ptr;
 
        atiixp_lock(sc);
        if (sc->polling != 0)
                ptr = ch->ptr;
        else
                ptr = atiixp_dmapos(ch);
        atiixp_unlock(sc);
 
        return (ptr);
}
 
static struct pcmchan_caps *
atiixp_chan_getcaps(kobj_t obj, void *data)
{
        struct atiixp_chinfo *ch = data;
 
        if (ch->caps_32bit)
                return (&atiixp_caps_32bit);
        return (&atiixp_caps);
}
 
static kobj_method_t atiixp_chan_methods[] = {
        KOBJMETHOD(channel_init,                atiixp_chan_init),
        KOBJMETHOD(channel_setformat,           atiixp_chan_setformat),
        KOBJMETHOD(channel_setspeed,            atiixp_chan_setspeed),
        KOBJMETHOD(channel_setblocksize,        atiixp_chan_setblocksize),
        KOBJMETHOD(channel_setfragments,        atiixp_chan_setfragments),
        KOBJMETHOD(channel_trigger,             atiixp_chan_trigger),
        KOBJMETHOD(channel_getptr,              atiixp_chan_getptr),
        KOBJMETHOD(channel_getcaps,             atiixp_chan_getcaps),
        KOBJMETHOD_END
};
CHANNEL_DECLARE(atiixp_chan);
 
/*
 * PCI driver interface
 */
static void
atiixp_intr(void *p)
{
        struct atiixp_info *sc = p;
        uint32_t status, enable, detected_codecs;
        uint32_t trigger = 0;
 
        atiixp_lock(sc);
        if (sc->polling != 0) {
                atiixp_unlock(sc);
                return;
        }
        status = atiixp_rd(sc, ATI_REG_ISR);
 
        if (status == 0) {
                atiixp_unlock(sc);
                return;
        }
 
        if ((status & ATI_REG_ISR_OUT_STATUS) &&
            (sc->pch.flags & ATI_IXP_CHN_RUNNING))
                trigger |= 1;
        if ((status & ATI_REG_ISR_IN_STATUS) &&
            (sc->rch.flags & ATI_IXP_CHN_RUNNING))
                trigger |= 2;
 
#if 0
        if (status & ATI_REG_ISR_IN_XRUN) {
                device_printf(sc->dev,
                        "Recieve IN XRUN interrupt\n");
        }
        if (status & ATI_REG_ISR_OUT_XRUN) {
                device_printf(sc->dev,
                        "Recieve OUT XRUN interrupt\n");
        }
#endif
 
        if (status & CODEC_CHECK_BITS) {
                /* mark missing codecs as not ready */
                detected_codecs = status & CODEC_CHECK_BITS;
                sc->codec_not_ready_bits |= detected_codecs;
 
                /* disable detected interrupt sources */
                enable  = atiixp_rd(sc, ATI_REG_IER);
                enable &= ~detected_codecs;
                atiixp_wr(sc, ATI_REG_IER, enable);
                wakeup(sc);
        }
 
        /* acknowledge */
        atiixp_wr(sc, ATI_REG_ISR, status);
        atiixp_unlock(sc);
 
        if (trigger & 1)
                chn_intr(sc->pch.channel);
        if (trigger & 2)
                chn_intr(sc->rch.channel);
}
 
static void
atiixp_dma_cb(void *p, bus_dma_segment_t *bds, int a, int b)
{
        struct atiixp_info *sc = (struct atiixp_info *)p;
        sc->sgd_addr = bds->ds_addr;
}
 
static void
atiixp_chip_pre_init(struct atiixp_info *sc)
{
        uint32_t value;
 
        atiixp_lock(sc);
 
        /* disable interrupts */
        atiixp_disable_interrupts(sc);
 
        /* clear all DMA enables (preserving rest of settings) */
        value = atiixp_rd(sc, ATI_REG_CMD);
        value &= ~(ATI_REG_CMD_IN_DMA_EN | ATI_REG_CMD_OUT_DMA_EN |
            ATI_REG_CMD_SPDF_OUT_EN );
        atiixp_wr(sc, ATI_REG_CMD, value);
 
        /* reset aclink */
        atiixp_reset_aclink(sc);
 
        sc->codec_not_ready_bits = 0;
 
        /* enable all codecs to interrupt as well as the new frame interrupt */
        atiixp_wr(sc, ATI_REG_IER, CODEC_CHECK_BITS);
 
        atiixp_unlock(sc);
}
 
static int
sysctl_atiixp_polling(SYSCTL_HANDLER_ARGS)
{
        struct atiixp_info *sc;
        device_t dev;
        int err, val;
 
        dev = oidp->oid_arg1;
        sc = pcm_getdevinfo(dev);
        if (sc == NULL)
                return (EINVAL);
        atiixp_lock(sc);
        val = sc->polling;
        atiixp_unlock(sc);
        err = sysctl_handle_int(oidp, &val, 0, req);
 
        if (err || req->newptr == NULL)
                return (err);
        if (val < 0 || val > 1)
                return (EINVAL);
 
        atiixp_lock(sc);
        if (val != sc->polling) {
                if (atiixp_chan_active(sc) != 0)
                        err = EBUSY;
                else if (val == 0) {
                        atiixp_enable_interrupts(sc);
                        sc->polling = 0;
                        DELAY(1000);
                } else {
                        atiixp_disable_interrupts(sc);
                        sc->polling = 1;
                        DELAY(1000);
                }
        }
        atiixp_unlock(sc);
 
        return (err);
}
 
static void
atiixp_chip_post_init(void *arg)
{
        struct atiixp_info *sc = (struct atiixp_info *)arg;
        uint32_t subdev;
        int i, timeout, found, polling;
        char status[SND_STATUSLEN];
 
        atiixp_lock(sc);
 
        if (sc->delayed_attach.ich_func) {
                config_intrhook_disestablish(&sc->delayed_attach);
                sc->delayed_attach.ich_func = NULL;
        }
 
        polling = sc->polling;
        sc->polling = 0;
 
        timeout = 10;
        if (sc->codec_not_ready_bits == 0) {
                /* wait for the interrupts to happen */
                do {
                        msleep(sc, sc->lock, PWAIT, "ixpslp", max(hz / 10, 1));
                        if (sc->codec_not_ready_bits != 0)
                                break;
                } while (--timeout);
        }
 
        sc->polling = polling;
        atiixp_disable_interrupts(sc);
 
        if (sc->codec_not_ready_bits == 0 && timeout == 0) {
                device_printf(sc->dev,
                        "WARNING: timeout during codec detection; "
                        "codecs might be present but haven't interrupted\n");
                atiixp_unlock(sc);
                goto postinitbad;
        }
 
        found = 0;
 
        /*
         * ATI IXP can have upto 3 codecs, but single codec should be
         * suffice for now.
         */
        if (!(sc->codec_not_ready_bits & ATI_REG_ISR_CODEC0_NOT_READY)) {
                /* codec 0 present */
                sc->codec_found++;
                sc->codec_idx = 0;
                found++;
        }
 
        if (!(sc->codec_not_ready_bits & ATI_REG_ISR_CODEC1_NOT_READY)) {
                /* codec 1 present */
                sc->codec_found++;
        }
 
        if (!(sc->codec_not_ready_bits & ATI_REG_ISR_CODEC2_NOT_READY)) {
                /* codec 2 present */
                sc->codec_found++;
        }
 
        atiixp_unlock(sc);
 
        if (found == 0)
                goto postinitbad;
 
        /* create/init mixer */
        sc->codec = AC97_CREATE(sc->dev, sc, atiixp_ac97);
        if (sc->codec == NULL)
                goto postinitbad;
 
        subdev = (pci_get_subdevice(sc->dev) << 16) |
            pci_get_subvendor(sc->dev);
        switch (subdev) {
        case 0x11831043:        /* ASUS A6R */
        case 0x2043161f:        /* Maxselect x710s - http://maxselect.ru/ */
                ac97_setflags(sc->codec, ac97_getflags(sc->codec) |
                    AC97_F_EAPD_INV);
                break;
        default:
                break;
        }
 
        mixer_init(sc->dev, ac97_getmixerclass(), sc->codec);
 
        if (pcm_register(sc->dev, sc, ATI_IXP_NPCHAN, ATI_IXP_NRCHAN))
                goto postinitbad;
 
        for (i = 0; i < ATI_IXP_NPCHAN; i++)
                pcm_addchan(sc->dev, PCMDIR_PLAY, &atiixp_chan_class, sc);
        for (i = 0; i < ATI_IXP_NRCHAN; i++)
                pcm_addchan(sc->dev, PCMDIR_REC, &atiixp_chan_class, sc);
 
        SYSCTL_ADD_PROC(device_get_sysctl_ctx(sc->dev),
            SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)), OID_AUTO,
            "polling", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, sc->dev,
            sizeof(sc->dev), sysctl_atiixp_polling, "I", "Enable polling mode");
 
        snprintf(status, SND_STATUSLEN, "at memory 0x%jx irq %jd %s",
            rman_get_start(sc->reg), rman_get_start(sc->irq),
            PCM_KLDSTRING(snd_atiixp));
 
        pcm_setstatus(sc->dev, status);
 
        atiixp_lock(sc);
        if (sc->polling == 0)
                atiixp_enable_interrupts(sc);
        atiixp_unlock(sc);
 
        return;
 
postinitbad:
        atiixp_release_resource(sc);
}
 
static void
atiixp_release_resource(struct atiixp_info *sc)
{
        if (sc == NULL)
                return;
        if (sc->registered_channels != 0) {
                atiixp_lock(sc);
                sc->polling = 0;
                callout_stop(&sc->poll_timer);
                atiixp_unlock(sc);
                callout_drain(&sc->poll_timer);
        }
        if (sc->codec) {
                ac97_destroy(sc->codec);
                sc->codec = NULL;
        }
        if (sc->ih) {
                bus_teardown_intr(sc->dev, sc->irq, sc->ih);
                sc->ih = NULL;
        }
        if (sc->reg) {
                bus_release_resource(sc->dev, sc->regtype, sc->regid, sc->reg);
                sc->reg = NULL;
        }
        if (sc->irq) {
                bus_release_resource(sc->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 = NULL;
        }
        if (sc->sgd_addr) {
                bus_dmamap_unload(sc->sgd_dmat, sc->sgd_dmamap);
                sc->sgd_addr = 0;
        }
        if (sc->sgd_table) {
                bus_dmamem_free(sc->sgd_dmat, sc->sgd_table, sc->sgd_dmamap);
                sc->sgd_table = NULL;
        }
        if (sc->sgd_dmat) {
                bus_dma_tag_destroy(sc->sgd_dmat);
                sc->sgd_dmat = NULL;
        }
        if (sc->lock) {
                snd_mtxfree(sc->lock);
                sc->lock = NULL;
        }
        free(sc, M_DEVBUF);
}
 
static int
atiixp_pci_probe(device_t dev)
{
        int i;
        uint16_t devid, vendor;
 
        vendor = pci_get_vendor(dev);
        devid = pci_get_device(dev);
        for (i = 0; i < sizeof(atiixp_hw) / sizeof(atiixp_hw[0]); i++) {
                if (vendor == atiixp_hw[i].vendor &&
                    devid == atiixp_hw[i].devid) {
                        device_set_desc(dev, atiixp_hw[i].desc);
                        return (BUS_PROBE_DEFAULT);
                }
        }
 
        return (ENXIO);
}
 
static int
atiixp_pci_attach(device_t dev)
{
        struct atiixp_info *sc;
        int i;
 
        sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK | M_ZERO);
        sc->lock = snd_mtxcreate(device_get_nameunit(dev), "snd_atiixp softc");
        sc->dev = dev;
 
        callout_init(&sc->poll_timer, 1);
        sc->poll_ticks = 1;
 
        if (resource_int_value(device_get_name(sc->dev),
            device_get_unit(sc->dev), "polling", &i) == 0 && i != 0)
                sc->polling = 1;
        else
                sc->polling = 0;
 
        pci_enable_busmaster(dev);
 
        sc->regid = PCIR_BAR(0);
        sc->regtype = SYS_RES_MEMORY;
        sc->reg = bus_alloc_resource_any(dev, sc->regtype,
            &sc->regid, RF_ACTIVE);
 
        if (!sc->reg) {
                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->bufsz = pcm_getbuffersize(dev, ATI_IXP_BUFSZ_MIN,
            ATI_IXP_BUFSZ_DEFAULT, ATI_IXP_BUFSZ_MAX);
 
        sc->irqid = 0;
        sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irqid,
            RF_ACTIVE | RF_SHAREABLE);
        if (!sc->irq || snd_setup_intr(dev, sc->irq, INTR_MPSAFE,
            atiixp_intr, sc, &sc->ih)) {
                device_printf(dev, "unable to map interrupt\n");
                goto bad;
        }
 
        /*
         * Let the user choose the best DMA segments.
         */
        if (resource_int_value(device_get_name(dev),
            device_get_unit(dev), "blocksize", &i) == 0 && i > 0) {
                i &= ATI_IXP_BLK_ALIGN;
                if (i < ATI_IXP_BLK_MIN)
                        i = ATI_IXP_BLK_MIN;
                sc->blkcnt = sc->bufsz / i;
                i = 0;
                while (sc->blkcnt >> i)
                        i++;
                sc->blkcnt = 1 << (i - 1);
                if (sc->blkcnt < ATI_IXP_DMA_CHSEGS_MIN)
                        sc->blkcnt = ATI_IXP_DMA_CHSEGS_MIN;
                else if (sc->blkcnt > ATI_IXP_DMA_CHSEGS_MAX)
                        sc->blkcnt = ATI_IXP_DMA_CHSEGS_MAX;
 
        } else
                sc->blkcnt = ATI_IXP_DMA_CHSEGS;
 
        /*
         * DMA tag for scatter-gather buffers and link pointers
         */
        if (bus_dma_tag_create(/*parent*/bus_get_dma_tag(dev), /*alignment*/2,
                /*boundary*/0,
                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
                /*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;
        }
 
        if (bus_dma_tag_create(/*parent*/bus_get_dma_tag(dev), /*alignment*/2,
                /*boundary*/0,
                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
                /*highaddr*/BUS_SPACE_MAXADDR,
                /*filter*/NULL, /*filterarg*/NULL,
                /*maxsize*/ATI_IXP_DMA_CHSEGS_MAX * ATI_IXP_NCHANS *
                sizeof(struct atiixp_dma_op),
                /*nsegments*/1, /*maxsegz*/0x3ffff,
                /*flags*/0, /*lockfunc*/NULL,
                /*lockarg*/NULL, &sc->sgd_dmat) != 0) {
                device_printf(dev, "unable to create dma tag\n");
                goto bad;
        }
 
        if (bus_dmamem_alloc(sc->sgd_dmat, (void **)&sc->sgd_table,
            BUS_DMA_NOWAIT, &sc->sgd_dmamap) == -1)
                goto bad;
 
        if (bus_dmamap_load(sc->sgd_dmat, sc->sgd_dmamap, sc->sgd_table,
            ATI_IXP_DMA_CHSEGS_MAX * ATI_IXP_NCHANS *
            sizeof(struct atiixp_dma_op), atiixp_dma_cb, sc, 0))
                goto bad;
 
        atiixp_chip_pre_init(sc);
 
        sc->delayed_attach.ich_func = atiixp_chip_post_init;
        sc->delayed_attach.ich_arg = sc;
        if (cold == 0 ||
            config_intrhook_establish(&sc->delayed_attach) != 0) {
                sc->delayed_attach.ich_func = NULL;
                atiixp_chip_post_init(sc);
        }
 
        return (0);
 
bad:
        atiixp_release_resource(sc);
        return (ENXIO);
}
 
static int
atiixp_pci_detach(device_t dev)
{
        int r;
        struct atiixp_info *sc;
 
        sc = pcm_getdevinfo(dev);
        if (sc != NULL) {
                if (sc->codec != NULL) {
                        r = pcm_unregister(dev);
                        if (r)
                                return (r);
                }
                sc->codec = NULL;
                if (sc->st != 0 && sc->sh != 0)
                        atiixp_disable_interrupts(sc);
                atiixp_release_resource(sc);
        }
        return (0);
}
 
static int
atiixp_pci_suspend(device_t dev)
{
        struct atiixp_info *sc = pcm_getdevinfo(dev);
        uint32_t value;
 
        /* quickly disable interrupts and save channels active state */
        atiixp_lock(sc);
        atiixp_disable_interrupts(sc);
        atiixp_unlock(sc);
 
        /* stop everything */
        if (sc->pch.flags & ATI_IXP_CHN_RUNNING) {
                atiixp_chan_trigger(NULL, &sc->pch, PCMTRIG_STOP);
                sc->pch.flags |= ATI_IXP_CHN_SUSPEND;
        }
        if (sc->rch.flags & ATI_IXP_CHN_RUNNING) {
                atiixp_chan_trigger(NULL, &sc->rch, PCMTRIG_STOP);
                sc->rch.flags |= ATI_IXP_CHN_SUSPEND;
        }
 
        /* power down aclink and pci bus */
        atiixp_lock(sc);
        value = atiixp_rd(sc, ATI_REG_CMD);
        value |= ATI_REG_CMD_POWERDOWN | ATI_REG_CMD_AC_RESET;
        atiixp_wr(sc, ATI_REG_CMD, ATI_REG_CMD_POWERDOWN);
        atiixp_unlock(sc);
 
        return (0);
}
 
static int
atiixp_pci_resume(device_t dev)
{
        struct atiixp_info *sc = pcm_getdevinfo(dev);
 
        atiixp_lock(sc);
        /* reset / power up aclink */
        atiixp_reset_aclink(sc);
        atiixp_unlock(sc);
 
        if (mixer_reinit(dev) == -1) {
                device_printf(dev, "unable to reinitialize the mixer\n");
                return (ENXIO);
        }
 
        /*
         * Resume channel activities. Reset channel format regardless
         * of its previous state.
         */
        if (sc->pch.channel != NULL) {
                if (sc->pch.fmt != 0)
                        atiixp_chan_setformat(NULL, &sc->pch, sc->pch.fmt);
                if (sc->pch.flags & ATI_IXP_CHN_SUSPEND) {
                        sc->pch.flags &= ~ATI_IXP_CHN_SUSPEND;
                        atiixp_chan_trigger(NULL, &sc->pch, PCMTRIG_START);
                }
        }
        if (sc->rch.channel != NULL) {
                if (sc->rch.fmt != 0)
                        atiixp_chan_setformat(NULL, &sc->rch, sc->rch.fmt);
                if (sc->rch.flags & ATI_IXP_CHN_SUSPEND) {
                        sc->rch.flags &= ~ATI_IXP_CHN_SUSPEND;
                        atiixp_chan_trigger(NULL, &sc->rch, PCMTRIG_START);
                }
        }
 
        /* enable interrupts */
        atiixp_lock(sc);
        if (sc->polling == 0)
                atiixp_enable_interrupts(sc);
        atiixp_unlock(sc);
 
        return (0);
}
 
static device_method_t atiixp_methods[] = {
        DEVMETHOD(device_probe,         atiixp_pci_probe),
        DEVMETHOD(device_attach,        atiixp_pci_attach),
        DEVMETHOD(device_detach,        atiixp_pci_detach),
        DEVMETHOD(device_suspend,       atiixp_pci_suspend),
        DEVMETHOD(device_resume,        atiixp_pci_resume),
        { 0, 0 }
};
 
static driver_t atiixp_driver = {
        "pcm",
        atiixp_methods,
        PCM_SOFTC_SIZE,
};
 
DRIVER_MODULE(snd_atiixp, pci, atiixp_driver, pcm_devclass, 0, 0);
MODULE_DEPEND(snd_atiixp, sound, SOUND_MINVER, SOUND_PREFVER, SOUND_MAXVER);
MODULE_VERSION(snd_atiixp, 1);