Archipelago » qemu

/*

 * Copyright (C) 2006 InnoTek Systemberatung GmbH

 *

 * This file is part of VirtualBox Open Source Edition (OSE), as

 * available from http://www.virtualbox.org. This file is free software;

 * you can redistribute it and/or modify it under the terms of the GNU

 * General Public License as published by the Free Software Foundation,

 * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE

 * distribution. VirtualBox OSE is distributed in the hope that it will

 * be useful, but WITHOUT ANY WARRANTY of any kind.

 *

 * If you received this file as part of a commercial VirtualBox

 * distribution, then only the terms of your commercial VirtualBox

 * license agreement apply instead of the previous paragraph.

 *

 * Contributions after 2012-01-13 are licensed under the terms of the

 * GNU GPL, version 2 or (at your option) any later version.

 */

#include "hw/hw.h"

#include "hw/audio/audio.h"

#include "audio/audio.h"

#include "hw/pci/pci.h"

#include "sysemu/dma.h"

enum {

    AC97_Reset                     = 0x00,

    AC97_Master_Volume_Mute        = 0x02,

    AC97_Headphone_Volume_Mute     = 0x04,

    AC97_Master_Volume_Mono_Mute   = 0x06,

    AC97_Master_Tone_RL            = 0x08,

    AC97_PC_BEEP_Volume_Mute       = 0x0A,

    AC97_Phone_Volume_Mute         = 0x0C,

    AC97_Mic_Volume_Mute           = 0x0E,

    AC97_Line_In_Volume_Mute       = 0x10,

    AC97_CD_Volume_Mute            = 0x12,

    AC97_Video_Volume_Mute         = 0x14,

    AC97_Aux_Volume_Mute           = 0x16,

    AC97_PCM_Out_Volume_Mute       = 0x18,

    AC97_Record_Select             = 0x1A,

    AC97_Record_Gain_Mute          = 0x1C,

    AC97_Record_Gain_Mic_Mute      = 0x1E,

    AC97_General_Purpose           = 0x20,

    AC97_3D_Control                = 0x22,

    AC97_AC_97_RESERVED            = 0x24,

    AC97_Powerdown_Ctrl_Stat       = 0x26,

    AC97_Extended_Audio_ID         = 0x28,

    AC97_Extended_Audio_Ctrl_Stat  = 0x2A,

    AC97_PCM_Front_DAC_Rate        = 0x2C,

    AC97_PCM_Surround_DAC_Rate     = 0x2E,

    AC97_PCM_LFE_DAC_Rate          = 0x30,

    AC97_PCM_LR_ADC_Rate           = 0x32,

    AC97_MIC_ADC_Rate              = 0x34,

    AC97_6Ch_Vol_C_LFE_Mute        = 0x36,

    AC97_6Ch_Vol_L_R_Surround_Mute = 0x38,

    AC97_Vendor_Reserved           = 0x58,

    AC97_Sigmatel_Analog           = 0x6c, /* We emulate a Sigmatel codec */

    AC97_Sigmatel_Dac2Invert       = 0x6e, /* We emulate a Sigmatel codec */

    AC97_Vendor_ID1                = 0x7c,

    AC97_Vendor_ID2                = 0x7e

};

#define SOFT_VOLUME

#define SR_FIFOE 16             /* rwc */

#define SR_BCIS  8              /* rwc */

#define SR_LVBCI 4              /* rwc */

#define SR_CELV  2              /* ro */

#define SR_DCH   1              /* ro */

#define SR_VALID_MASK ((1 << 5) - 1)

#define SR_WCLEAR_MASK (SR_FIFOE | SR_BCIS | SR_LVBCI)

#define SR_RO_MASK (SR_DCH | SR_CELV)

#define SR_INT_MASK (SR_FIFOE | SR_BCIS | SR_LVBCI)

#define CR_IOCE  16             /* rw */

#define CR_FEIE  8              /* rw */

#define CR_LVBIE 4              /* rw */

#define CR_RR    2              /* rw */

#define CR_RPBM  1              /* rw */

#define CR_VALID_MASK ((1 << 5) - 1)

#define CR_DONT_CLEAR_MASK (CR_IOCE | CR_FEIE | CR_LVBIE)

#define GC_WR    4              /* rw */

#define GC_CR    2              /* rw */

#define GC_VALID_MASK ((1 << 6) - 1)

#define GS_MD3   (1<<17)        /* rw */

#define GS_AD3   (1<<16)        /* rw */

#define GS_RCS   (1<<15)        /* rwc */

#define GS_B3S12 (1<<14)        /* ro */

#define GS_B2S12 (1<<13)        /* ro */

#define GS_B1S12 (1<<12)        /* ro */

#define GS_S1R1  (1<<11)        /* rwc */

#define GS_S0R1  (1<<10)        /* rwc */

#define GS_S1CR  (1<<9)         /* ro */

#define GS_S0CR  (1<<8)         /* ro */

#define GS_MINT  (1<<7)         /* ro */

#define GS_POINT (1<<6)         /* ro */

#define GS_PIINT (1<<5)         /* ro */

#define GS_RSRVD ((1<<4)|(1<<3))

#define GS_MOINT (1<<2)         /* ro */

#define GS_MIINT (1<<1)         /* ro */

#define GS_GSCI  1              /* rwc */

#define GS_RO_MASK (GS_B3S12|                   \

                    GS_B2S12|                   \

                    GS_B1S12|                   \

                    GS_S1CR|                    \

                    GS_S0CR|                    \

                    GS_MINT|                    \

                    GS_POINT|                   \

                    GS_PIINT|                   \

                    GS_RSRVD|                   \

                    GS_MOINT|                   \

                    GS_MIINT)

#define GS_VALID_MASK ((1 << 18) - 1)

#define GS_WCLEAR_MASK (GS_RCS|GS_S1R1|GS_S0R1|GS_GSCI)

#define BD_IOC (1<<31)

#define BD_BUP (1<<30)

#define EACS_VRA 1

#define EACS_VRM 8

#define MUTE_SHIFT 15

#define REC_MASK 7

enum {

    REC_MIC = 0,

    REC_CD,

    REC_VIDEO,

    REC_AUX,

    REC_LINE_IN,

    REC_STEREO_MIX,

    REC_MONO_MIX,

    REC_PHONE

};

typedef struct BD {

    uint32_t addr;

    uint32_t ctl_len;

} BD;

typedef struct AC97BusMasterRegs {

    uint32_t bdbar;             /* rw 0 */

    uint8_t civ;                /* ro 0 */

    uint8_t lvi;                /* rw 0 */

    uint16_t sr;                /* rw 1 */

    uint16_t picb;              /* ro 0 */

    uint8_t piv;                /* ro 0 */

    uint8_t cr;                 /* rw 0 */

    unsigned int bd_valid;

    BD bd;

} AC97BusMasterRegs;

typedef struct AC97LinkState {

    PCIDevice dev;

    QEMUSoundCard card;

    uint32_t use_broken_id;

    uint32_t glob_cnt;

    uint32_t glob_sta;

    uint32_t cas;

    uint32_t last_samp;

    AC97BusMasterRegs bm_regs[3];

    uint8_t mixer_data[256];

    SWVoiceIn *voice_pi;

    SWVoiceOut *voice_po;

    SWVoiceIn *voice_mc;

    int invalid_freq[3];

    uint8_t silence[128];

    int bup_flag;

    MemoryRegion io_nam;

    MemoryRegion io_nabm;

} AC97LinkState;

enum {

    BUP_SET = 1,

    BUP_LAST = 2

};

#ifdef DEBUG_AC97

#define dolog(...) AUD_log ("ac97", __VA_ARGS__)

#else

#define dolog(...)

#endif

#define MKREGS(prefix, start)                   \

enum {                                          \

    prefix ## _BDBAR = start,                   \

    prefix ## _CIV = start + 4,                 \

    prefix ## _LVI = start + 5,                 \

    prefix ## _SR = start + 6,                  \

    prefix ## _PICB = start + 8,                \

    prefix ## _PIV = start + 10,                \

    prefix ## _CR = start + 11                  \

}

enum {

    PI_INDEX = 0,

    PO_INDEX,

    MC_INDEX,

    LAST_INDEX

};

MKREGS (PI, PI_INDEX * 16);

MKREGS (PO, PO_INDEX * 16);

MKREGS (MC, MC_INDEX * 16);

enum {

    GLOB_CNT = 0x2c,

    GLOB_STA = 0x30,

    CAS      = 0x34

};

#define GET_BM(index) (((index) >> 4) & 3)

static void po_callback (void *opaque, int free);

static void pi_callback (void *opaque, int avail);

static void mc_callback (void *opaque, int avail);

static void warm_reset (AC97LinkState *s)

{

    (void) s;

}

static void cold_reset (AC97LinkState * s)

{

    (void) s;

}

static void fetch_bd (AC97LinkState *s, AC97BusMasterRegs *r)

{

    uint8_t b[8];

    pci_dma_read (&s->dev, r->bdbar + r->civ * 8, b, 8);

    r->bd_valid = 1;

    r->bd.addr = le32_to_cpu (*(uint32_t *) &b[0]) & ~3;

    r->bd.ctl_len = le32_to_cpu (*(uint32_t *) &b[4]);

    r->picb = r->bd.ctl_len & 0xffff;

    dolog ("bd %2d addr=%#x ctl=%#06x len=%#x(%d bytes)\n",

           r->civ, r->bd.addr, r->bd.ctl_len >> 16,

           r->bd.ctl_len & 0xffff,

           (r->bd.ctl_len & 0xffff) << 1);

}

static void update_sr (AC97LinkState *s, AC97BusMasterRegs *r, uint32_t new_sr)

{

    int event = 0;

    int level = 0;

    uint32_t new_mask = new_sr & SR_INT_MASK;

    uint32_t old_mask = r->sr & SR_INT_MASK;

    uint32_t masks[] = {GS_PIINT, GS_POINT, GS_MINT};

    if (new_mask ^ old_mask) {

        /** @todo is IRQ deasserted when only one of status bits is cleared? */

        if (!new_mask) {

            event = 1;

            level = 0;

        }

        else {

            if ((new_mask & SR_LVBCI) && (r->cr & CR_LVBIE)) {

                event = 1;

                level = 1;

            }

            if ((new_mask & SR_BCIS) && (r->cr & CR_IOCE)) {

                event = 1;

                level = 1;

            }

        }

    }

    r->sr = new_sr;

    dolog ("IOC%d LVB%d sr=%#x event=%d level=%d\n",

           r->sr & SR_BCIS, r->sr & SR_LVBCI,

           r->sr,

           event, level);

    if (!event)

        return;

    if (level) {

        s->glob_sta |= masks[r - s->bm_regs];

        dolog ("set irq level=1\n");

        qemu_set_irq (s->dev.irq[0], 1);

    }

    else {

        s->glob_sta &= ~masks[r - s->bm_regs];

        dolog ("set irq level=0\n");

        qemu_set_irq (s->dev.irq[0], 0);

    }

}

static void voice_set_active (AC97LinkState *s, int bm_index, int on)

{

    switch (bm_index) {

    case PI_INDEX:

        AUD_set_active_in (s->voice_pi, on);

        break;

    case PO_INDEX:

        AUD_set_active_out (s->voice_po, on);

        break;

    case MC_INDEX:

        AUD_set_active_in (s->voice_mc, on);

        break;

    default:

        AUD_log ("ac97", "invalid bm_index(%d) in voice_set_active", bm_index);

        break;

    }

}

static void reset_bm_regs (AC97LinkState *s, AC97BusMasterRegs *r)

{

    dolog ("reset_bm_regs\n");

    r->bdbar = 0;

    r->civ = 0;

    r->lvi = 0;

    /** todo do we need to do that? */

    update_sr (s, r, SR_DCH);

    r->picb = 0;

    r->piv = 0;

    r->cr = r->cr & CR_DONT_CLEAR_MASK;

    r->bd_valid = 0;

    voice_set_active (s, r - s->bm_regs, 0);

    memset (s->silence, 0, sizeof (s->silence));

}

static void mixer_store (AC97LinkState *s, uint32_t i, uint16_t v)

{

    if (i + 2 > sizeof (s->mixer_data)) {

        dolog ("mixer_store: index %d out of bounds %zd\n",

               i, sizeof (s->mixer_data));

        return;

    }

    s->mixer_data[i + 0] = v & 0xff;

    s->mixer_data[i + 1] = v >> 8;

}

static uint16_t mixer_load (AC97LinkState *s, uint32_t i)

{

    uint16_t val = 0xffff;

    if (i + 2 > sizeof (s->mixer_data)) {

        dolog ("mixer_load: index %d out of bounds %zd\n",

               i, sizeof (s->mixer_data));

    }

    else {

        val = s->mixer_data[i + 0] | (s->mixer_data[i + 1] << 8);

    }

    return val;

}

static void open_voice (AC97LinkState *s, int index, int freq)

{

    struct audsettings as;

    as.freq = freq;

    as.nchannels = 2;

    as.fmt = AUD_FMT_S16;

    as.endianness = 0;

    if (freq > 0) {

        s->invalid_freq[index] = 0;

        switch (index) {

        case PI_INDEX:

            s->voice_pi = AUD_open_in (

                &s->card,

                s->voice_pi,

                "ac97.pi",

                s,

                pi_callback,

                &as

                );

            break;

        case PO_INDEX:

            s->voice_po = AUD_open_out (

                &s->card,

                s->voice_po,

                "ac97.po",

                s,

                po_callback,

                &as

                );

            break;

        case MC_INDEX:

            s->voice_mc = AUD_open_in (

                &s->card,

                s->voice_mc,

                "ac97.mc",

                s,

                mc_callback,

                &as

                );

            break;

        }

    }

    else {

        s->invalid_freq[index] = freq;

        switch (index) {

        case PI_INDEX:

            AUD_close_in (&s->card, s->voice_pi);

            s->voice_pi = NULL;

            break;

        case PO_INDEX:

            AUD_close_out (&s->card, s->voice_po);

            s->voice_po = NULL;

            break;

        case MC_INDEX:

            AUD_close_in (&s->card, s->voice_mc);

            s->voice_mc = NULL;

            break;

        }

    }

}

static void reset_voices (AC97LinkState *s, uint8_t active[LAST_INDEX])

{

    uint16_t freq;

    freq = mixer_load (s, AC97_PCM_LR_ADC_Rate);

    open_voice (s, PI_INDEX, freq);

    AUD_set_active_in (s->voice_pi, active[PI_INDEX]);

    freq = mixer_load (s, AC97_PCM_Front_DAC_Rate);

    open_voice (s, PO_INDEX, freq);

    AUD_set_active_out (s->voice_po, active[PO_INDEX]);

    freq = mixer_load (s, AC97_MIC_ADC_Rate);

    open_voice (s, MC_INDEX, freq);

    AUD_set_active_in (s->voice_mc, active[MC_INDEX]);

}

static void get_volume (uint16_t vol, uint16_t mask, int inverse,

                        int *mute, uint8_t *lvol, uint8_t *rvol)

{

    *mute = (vol >> MUTE_SHIFT) & 1;

    *rvol = (255 * (vol & mask)) / mask;

    *lvol = (255 * ((vol >> 8) & mask)) / mask;

    if (inverse) {

        *rvol = 255 - *rvol;

        *lvol = 255 - *lvol;

    }

}

static void update_combined_volume_out (AC97LinkState *s)

{

    uint8_t lvol, rvol, plvol, prvol;

    int mute, pmute;

    get_volume (mixer_load (s, AC97_Master_Volume_Mute), 0x3f, 1,

                &mute, &lvol, &rvol);

    get_volume (mixer_load (s, AC97_PCM_Out_Volume_Mute), 0x1f, 1,

                &pmute, &plvol, &prvol);

    mute = mute | pmute;

    lvol = (lvol * plvol) / 255;

    rvol = (rvol * prvol) / 255;

    AUD_set_volume_out (s->voice_po, mute, lvol, rvol);

}

static void update_volume_in (AC97LinkState *s)

{

    uint8_t lvol, rvol;

    int mute;

    get_volume (mixer_load (s, AC97_Record_Gain_Mute), 0x0f, 0,

                &mute, &lvol, &rvol);

    AUD_set_volume_in (s->voice_pi, mute, lvol, rvol);

}

static void set_volume (AC97LinkState *s, int index, uint32_t val)

{

    switch (index) {

    case AC97_Master_Volume_Mute:

        val &= 0xbf3f;

        mixer_store (s, index, val);

        update_combined_volume_out (s);

        break;

    case AC97_PCM_Out_Volume_Mute:

        val &= 0x9f1f;

        mixer_store (s, index, val);

        update_combined_volume_out (s);

        break;

    case AC97_Record_Gain_Mute:

        val &= 0x8f0f;

        mixer_store (s, index, val);

        update_volume_in (s);

        break;

    }

}

static void record_select (AC97LinkState *s, uint32_t val)

{

    uint8_t rs = val & REC_MASK;

    uint8_t ls = (val >> 8) & REC_MASK;

    mixer_store (s, AC97_Record_Select, rs | (ls << 8));

}

static void mixer_reset (AC97LinkState *s)

{

    uint8_t active[LAST_INDEX];

    dolog ("mixer_reset\n");

    memset (s->mixer_data, 0, sizeof (s->mixer_data));

    memset (active, 0, sizeof (active));

    mixer_store (s, AC97_Reset                   , 0x0000); /* 6940 */

    mixer_store (s, AC97_Headphone_Volume_Mute   , 0x0000);

    mixer_store (s, AC97_Master_Volume_Mono_Mute , 0x0000);

    mixer_store (s, AC97_Master_Tone_RL,           0x0000);

    mixer_store (s, AC97_PC_BEEP_Volume_Mute     , 0x0000);

    mixer_store (s, AC97_Phone_Volume_Mute       , 0x0000);

    mixer_store (s, AC97_Mic_Volume_Mute         , 0x0000);

    mixer_store (s, AC97_Line_In_Volume_Mute     , 0x0000);

    mixer_store (s, AC97_CD_Volume_Mute          , 0x0000);

    mixer_store (s, AC97_Video_Volume_Mute       , 0x0000);

    mixer_store (s, AC97_Aux_Volume_Mute         , 0x0000);

    mixer_store (s, AC97_Record_Gain_Mic_Mute    , 0x0000);

    mixer_store (s, AC97_General_Purpose         , 0x0000);

    mixer_store (s, AC97_3D_Control              , 0x0000);

    mixer_store (s, AC97_Powerdown_Ctrl_Stat     , 0x000f);

    /*

     * Sigmatel 9700 (STAC9700)

     */

    mixer_store (s, AC97_Vendor_ID1              , 0x8384);

    mixer_store (s, AC97_Vendor_ID2              , 0x7600); /* 7608 */

    mixer_store (s, AC97_Extended_Audio_ID       , 0x0809);

    mixer_store (s, AC97_Extended_Audio_Ctrl_Stat, 0x0009);

    mixer_store (s, AC97_PCM_Front_DAC_Rate      , 0xbb80);

    mixer_store (s, AC97_PCM_Surround_DAC_Rate   , 0xbb80);

    mixer_store (s, AC97_PCM_LFE_DAC_Rate        , 0xbb80);

    mixer_store (s, AC97_PCM_LR_ADC_Rate         , 0xbb80);

    mixer_store (s, AC97_MIC_ADC_Rate            , 0xbb80);

    record_select (s, 0);

    set_volume (s, AC97_Master_Volume_Mute, 0x8000);

    set_volume (s, AC97_PCM_Out_Volume_Mute, 0x8808);

    set_volume (s, AC97_Record_Gain_Mute, 0x8808);

    reset_voices (s, active);

}

/**

 * Native audio mixer

 * I/O Reads

 */

static uint32_t nam_readb (void *opaque, uint32_t addr)

{

    AC97LinkState *s = opaque;

    dolog ("U nam readb %#x\n", addr);

    s->cas = 0;

    return ~0U;

}

static uint32_t nam_readw (void *opaque, uint32_t addr)

{

    AC97LinkState *s = opaque;

    uint32_t val = ~0U;

    uint32_t index = addr;

    s->cas = 0;

    val = mixer_load (s, index);

    return val;

}

static uint32_t nam_readl (void *opaque, uint32_t addr)

{

    AC97LinkState *s = opaque;

    dolog ("U nam readl %#x\n", addr);

    s->cas = 0;

    return ~0U;

}

/**

 * Native audio mixer

 * I/O Writes

 */

static void nam_writeb (void *opaque, uint32_t addr, uint32_t val)

{

    AC97LinkState *s = opaque;

    dolog ("U nam writeb %#x <- %#x\n", addr, val);

    s->cas = 0;

}

static void nam_writew (void *opaque, uint32_t addr, uint32_t val)

{

    AC97LinkState *s = opaque;

    uint32_t index = addr;

    s->cas = 0;

    switch (index) {

    case AC97_Reset:

        mixer_reset (s);

        break;

    case AC97_Powerdown_Ctrl_Stat:

        val &= ~0x800f;

        val |= mixer_load (s, index) & 0xf;

        mixer_store (s, index, val);

        break;

    case AC97_PCM_Out_Volume_Mute:

    case AC97_Master_Volume_Mute:

    case AC97_Record_Gain_Mute:

        set_volume (s, index, val);

        break;

    case AC97_Record_Select:

        record_select (s, val);

        break;

    case AC97_Vendor_ID1:

    case AC97_Vendor_ID2:

        dolog ("Attempt to write vendor ID to %#x\n", val);

        break;

    case AC97_Extended_Audio_ID:

        dolog ("Attempt to write extended audio ID to %#x\n", val);

        break;

    case AC97_Extended_Audio_Ctrl_Stat:

        if (!(val & EACS_VRA)) {

            mixer_store (s, AC97_PCM_Front_DAC_Rate, 0xbb80);

            mixer_store (s, AC97_PCM_LR_ADC_Rate,    0xbb80);

            open_voice (s, PI_INDEX, 48000);

            open_voice (s, PO_INDEX, 48000);

        }

        if (!(val & EACS_VRM)) {

            mixer_store (s, AC97_MIC_ADC_Rate, 0xbb80);

            open_voice (s, MC_INDEX, 48000);

        }

        dolog ("Setting extended audio control to %#x\n", val);

        mixer_store (s, AC97_Extended_Audio_Ctrl_Stat, val);

        break;

    case AC97_PCM_Front_DAC_Rate:

        if (mixer_load (s, AC97_Extended_Audio_Ctrl_Stat) & EACS_VRA) {

            mixer_store (s, index, val);

            dolog ("Set front DAC rate to %d\n", val);

            open_voice (s, PO_INDEX, val);

        }

        else {

            dolog ("Attempt to set front DAC rate to %d, "

                   "but VRA is not set\n",

                   val);

        }

        break;

    case AC97_MIC_ADC_Rate:

        if (mixer_load (s, AC97_Extended_Audio_Ctrl_Stat) & EACS_VRM) {

            mixer_store (s, index, val);

            dolog ("Set MIC ADC rate to %d\n", val);

            open_voice (s, MC_INDEX, val);

        }

        else {

            dolog ("Attempt to set MIC ADC rate to %d, "

                   "but VRM is not set\n",

                   val);

        }

        break;

    case AC97_PCM_LR_ADC_Rate:

        if (mixer_load (s, AC97_Extended_Audio_Ctrl_Stat) & EACS_VRA) {

            mixer_store (s, index, val);

            dolog ("Set front LR ADC rate to %d\n", val);

            open_voice (s, PI_INDEX, val);

        }

        else {

            dolog ("Attempt to set LR ADC rate to %d, but VRA is not set\n",

                    val);

        }

        break;

    case AC97_Headphone_Volume_Mute:

    case AC97_Master_Volume_Mono_Mute:

    case AC97_Master_Tone_RL:

    case AC97_PC_BEEP_Volume_Mute:

    case AC97_Phone_Volume_Mute:

    case AC97_Mic_Volume_Mute:

    case AC97_Line_In_Volume_Mute:

    case AC97_CD_Volume_Mute:

    case AC97_Video_Volume_Mute:

    case AC97_Aux_Volume_Mute:

    case AC97_Record_Gain_Mic_Mute:

    case AC97_General_Purpose:

    case AC97_3D_Control:

    case AC97_Sigmatel_Analog:

    case AC97_Sigmatel_Dac2Invert:

        /* None of the features in these regs are emulated, so they are RO */

        break;

    default:

        dolog ("U nam writew %#x <- %#x\n", addr, val);

        mixer_store (s, index, val);

        break;

    }

}

static void nam_writel (void *opaque, uint32_t addr, uint32_t val)

{

    AC97LinkState *s = opaque;

    dolog ("U nam writel %#x <- %#x\n", addr, val);

    s->cas = 0;

}

/**

 * Native audio bus master

 * I/O Reads

 */

static uint32_t nabm_readb (void *opaque, uint32_t addr)

{

    AC97LinkState *s = opaque;

    AC97BusMasterRegs *r = NULL;

    uint32_t index = addr;

    uint32_t val = ~0U;

    switch (index) {

    case CAS:

        dolog ("CAS %d\n", s->cas);

        val = s->cas;

        s->cas = 1;

        break;

    case PI_CIV:

    case PO_CIV:

    case MC_CIV:

        r = &s->bm_regs[GET_BM (index)];

        val = r->civ;

        dolog ("CIV[%d] -> %#x\n", GET_BM (index), val);

        break;

    case PI_LVI:

    case PO_LVI:

    case MC_LVI:

        r = &s->bm_regs[GET_BM (index)];

        val = r->lvi;

        dolog ("LVI[%d] -> %#x\n", GET_BM (index), val);

        break;

    case PI_PIV:

    case PO_PIV:

    case MC_PIV:

        r = &s->bm_regs[GET_BM (index)];

        val = r->piv;

        dolog ("PIV[%d] -> %#x\n", GET_BM (index), val);

        break;

    case PI_CR:

    case PO_CR:

    case MC_CR:

        r = &s->bm_regs[GET_BM (index)];

        val = r->cr;

        dolog ("CR[%d] -> %#x\n", GET_BM (index), val);

        break;

    case PI_SR:

    case PO_SR:

    case MC_SR:

        r = &s->bm_regs[GET_BM (index)];

        val = r->sr & 0xff;

        dolog ("SRb[%d] -> %#x\n", GET_BM (index), val);

        break;

    default:

        dolog ("U nabm readb %#x -> %#x\n", addr, val);

        break;

    }

    return val;

}

static uint32_t nabm_readw (void *opaque, uint32_t addr)

{

    AC97LinkState *s = opaque;

    AC97BusMasterRegs *r = NULL;

    uint32_t index = addr;

    uint32_t val = ~0U;

    switch (index) {

    case PI_SR:

    case PO_SR:

    case MC_SR:

        r = &s->bm_regs[GET_BM (index)];

        val = r->sr;

        dolog ("SR[%d] -> %#x\n", GET_BM (index), val);

        break;

    case PI_PICB:

    case PO_PICB:

    case MC_PICB:

        r = &s->bm_regs[GET_BM (index)];

        val = r->picb;

        dolog ("PICB[%d] -> %#x\n", GET_BM (index), val);

        break;

    default:

        dolog ("U nabm readw %#x -> %#x\n", addr, val);

        break;

    }

    return val;

}

static uint32_t nabm_readl (void *opaque, uint32_t addr)

{

    AC97LinkState *s = opaque;

    AC97BusMasterRegs *r = NULL;

    uint32_t index = addr;

    uint32_t val = ~0U;

    switch (index) {

    case PI_BDBAR:

    case PO_BDBAR:

    case MC_BDBAR:

        r = &s->bm_regs[GET_BM (index)];

        val = r->bdbar;

        dolog ("BMADDR[%d] -> %#x\n", GET_BM (index), val);

        break;

    case PI_CIV:

    case PO_CIV:

    case MC_CIV:

        r = &s->bm_regs[GET_BM (index)];

        val = r->civ | (r->lvi << 8) | (r->sr << 16);

        dolog ("CIV LVI SR[%d] -> %#x, %#x, %#x\n", GET_BM (index),

               r->civ, r->lvi, r->sr);

        break;

    case PI_PICB:

    case PO_PICB:

    case MC_PICB:

        r = &s->bm_regs[GET_BM (index)];

        val = r->picb | (r->piv << 16) | (r->cr << 24);

        dolog ("PICB PIV CR[%d] -> %#x %#x %#x %#x\n", GET_BM (index),

               val, r->picb, r->piv, r->cr);

        break;

    case GLOB_CNT:

        val = s->glob_cnt;

        dolog ("glob_cnt -> %#x\n", val);

        break;

    case GLOB_STA:

        val = s->glob_sta | GS_S0CR;

        dolog ("glob_sta -> %#x\n", val);

        break;

    default:

        dolog ("U nabm readl %#x -> %#x\n", addr, val);

        break;

    }

    return val;

}

/**

 * Native audio bus master

 * I/O Writes

 */

static void nabm_writeb (void *opaque, uint32_t addr, uint32_t val)

{

    AC97LinkState *s = opaque;

    AC97BusMasterRegs *r = NULL;

    uint32_t index = addr;

    switch (index) {

    case PI_LVI:

    case PO_LVI:

    case MC_LVI:

        r = &s->bm_regs[GET_BM (index)];

        if ((r->cr & CR_RPBM) && (r->sr & SR_DCH)) {

            r->sr &= ~(SR_DCH | SR_CELV);

            r->civ = r->piv;

            r->piv = (r->piv + 1) % 32;

            fetch_bd (s, r);

        }

        r->lvi = val % 32;

        dolog ("LVI[%d] <- %#x\n", GET_BM (index), val);

        break;

    case PI_CR:

    case PO_CR:

    case MC_CR:

        r = &s->bm_regs[GET_BM (index)];

        if (val & CR_RR) {

            reset_bm_regs (s, r);

        }

        else {

            r->cr = val & CR_VALID_MASK;

            if (!(r->cr & CR_RPBM)) {

                voice_set_active (s, r - s->bm_regs, 0);

                r->sr |= SR_DCH;

            }

            else {

                r->civ = r->piv;

                r->piv = (r->piv + 1) % 32;