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#ifndef __SOUND_AZT3328_H
#define __SOUND_AZT3328_H

/* "PU" == "power-up value", as tested on PCI168 PCI rev. 10
 * "WRITE_ONLY"  == register does not indicate actual bit values */

/*** main I/O area port indices ***/
/* (only 0x70 of 0x80 bytes saved/restored by Windows driver) */
#define AZF_IO_SIZE_CODEC     0x80
#define AZF_IO_SIZE_CODEC_PM  0x70

/* the driver initialisation suggests a layout of 4 main areas:
 * from 0x00 (playback), from 0x20 (recording) and from 0x40 (maybe MPU401??).
 * And another area from 0x60 to 0x6f (DirectX timer, IRQ management,
 * power management etc.???). */

/** playback area **/
#define IDX_IO_PLAY_FLAGS       0x00 /* PU:0x0000 */
     /* able to reactivate output after output muting due to 8/16bit
      * output change, just like 0x0002.
      * 0x0001 is the only bit that's able to start the DMA counter */
  #define DMA_RESUME                0x0001 /* paused if cleared ? */
     /* 0x0002 *temporarily* set during DMA stopping. hmm
      * both 0x0002 and 0x0004 set in playback setup. */
     /* able to reactivate output after output muting due to 8/16bit
      * output change, just like 0x0001. */
  #define DMA_PLAY_SOMETHING1       0x0002 /* \ alternated (toggled) */
     /* 0x0004: NOT able to reactivate output */
  #define DMA_PLAY_SOMETHING2       0x0004 /* / bits */
  #define SOMETHING_ALMOST_ALWAYS_SET     0x0008 /* ???; can be modified */
  #define DMA_EPILOGUE_SOMETHING    0x0010
  #define DMA_SOMETHING_ELSE        0x0020 /* ??? */
  #define SOMETHING_UNMODIFIABLE    0xffc0 /* unused ? not modifiable */
#define IDX_IO_PLAY_IRQTYPE     0x02 /* PU:0x0001 */
  /* write back to flags in case flags are set, in order to ACK IRQ in handler
   * (bit 1 of port 0x64 indicates interrupt for one of these three types)
   * sometimes in this case it just writes 0xffff to globally ACK all IRQs
   * settings written are not reflected when reading back, though.
   * seems to be IRQ, too (frequently used: port |= 0x07 !), but who knows ? */
  #define IRQ_PLAY_SOMETHING        0x0001 /* something & ACK */
  #define IRQ_FINISHED_PLAYBUF_1    0x0002 /* 1st dmabuf finished & ACK */
  #define IRQ_FINISHED_PLAYBUF_2    0x0004 /* 2nd dmabuf finished & ACK */
  #define IRQMASK_SOME_STATUS_1           0x0008 /* \ related bits */
  #define IRQMASK_SOME_STATUS_2           0x0010 /* / (checked together in loop) */
  #define IRQMASK_UNMODIFIABLE            0xffe0 /* unused ? not modifiable */
#define IDX_IO_PLAY_DMA_START_1 0x04 /* start address of 1st DMA play area, PU:0x00000000 */
#define IDX_IO_PLAY_DMA_START_2 0x08 /* start address of 2nd DMA play area, PU:0x00000000 */
#define IDX_IO_PLAY_DMA_LEN_1   0x0c /* length of 1st DMA play area, PU:0x0000 */
#define IDX_IO_PLAY_DMA_LEN_2   0x0e /* length of 2nd DMA play area, PU:0x0000 */
#define IDX_IO_PLAY_DMA_CURRPOS 0x10 /* current DMA position, PU:0x00000000 */
#define IDX_IO_PLAY_DMA_CURROFS     0x14 /* offset within current DMA play area, PU:0x0000 */
#define IDX_IO_PLAY_SOUNDFORMAT 0x16 /* PU:0x0010 */
  /* all unspecified bits can't be modified */
  #define SOUNDFORMAT_FREQUENCY_MASK      0x000f
  #define SOUNDFORMAT_XTAL1         0x00
  #define SOUNDFORMAT_XTAL2         0x01
    /* all _SUSPECTED_ values are not used by Windows drivers, so we don't
     * have any hard facts, only rough measurements.
     * All we know is that the crystal used on the board has 24.576MHz,
     * like many soundcards (which results in the frequencies below when
     * using certain divider values selected by the values below) */
    #define SOUNDFORMAT_FREQ_5510         0x0c | SOUNDFORMAT_XTAL2
    #define SOUNDFORMAT_FREQ_6620         0x0a | SOUNDFORMAT_XTAL2
    #define SOUNDFORMAT_FREQ_8000         0x00 | SOUNDFORMAT_XTAL1 /* also 0x0e | SOUNDFORMAT_XTAL1? */
    #define SOUNDFORMAT_FREQ_9600         0x08 | SOUNDFORMAT_XTAL1
    #define SOUNDFORMAT_FREQ_11025        0x00 | SOUNDFORMAT_XTAL2 /* also 0x0e | SOUNDFORMAT_XTAL2? */
    #define SOUNDFORMAT_FREQ_SUSPECTED_13240    0x08 | SOUNDFORMAT_XTAL2 /* seems to be 6620 *2 */
    #define SOUNDFORMAT_FREQ_16000        0x02 | SOUNDFORMAT_XTAL1
    #define SOUNDFORMAT_FREQ_22050        0x02 | SOUNDFORMAT_XTAL2
    #define SOUNDFORMAT_FREQ_32000        0x04 | SOUNDFORMAT_XTAL1
    #define SOUNDFORMAT_FREQ_44100        0x04 | SOUNDFORMAT_XTAL2
    #define SOUNDFORMAT_FREQ_48000        0x06 | SOUNDFORMAT_XTAL1
    #define SOUNDFORMAT_FREQ_SUSPECTED_66200    0x06 | SOUNDFORMAT_XTAL2 /* 66200 (13240 * 5); 64000 may have been nicer :-\ */
  #define SOUNDFORMAT_FLAG_16BIT    0x0010
  #define SOUNDFORMAT_FLAG_2CHANNELS      0x0020

/* define frequency helpers, for maximum value safety */
enum azf_freq_t {
#define AZF_FREQ(rate) AZF_FREQ_##rate = rate
#undef AZF_FREQ

/** recording area (see also: playback bit flag definitions) **/
#define IDX_IO_REC_FLAGS      0x20 /* ??, PU:0x0000 */
#define IDX_IO_REC_IRQTYPE    0x22 /* ??, PU:0x0000 */
  #define IRQ_REC_SOMETHING         0x0001 /* something & ACK */
  #define IRQ_FINISHED_RECBUF_1           0x0002 /* 1st dmabuf finished & ACK */
  #define IRQ_FINISHED_RECBUF_2           0x0004 /* 2nd dmabuf finished & ACK */
  /* hmm, maybe these are just the corresponding *recording* flags ?
   * but OTOH they are most likely at port 0x22 instead */
  #define IRQMASK_SOME_STATUS_1           0x0008 /* \ related bits */
  #define IRQMASK_SOME_STATUS_2           0x0010 /* / (checked together in loop) */
#define IDX_IO_REC_DMA_START_1  0x24 /* PU:0x00000000 */
#define IDX_IO_REC_DMA_START_2  0x28 /* PU:0x00000000 */
#define IDX_IO_REC_DMA_LEN_1    0x2c /* PU:0x0000 */
#define IDX_IO_REC_DMA_LEN_2    0x2e /* PU:0x0000 */
#define IDX_IO_REC_DMA_CURRPOS  0x30 /* PU:0x00000000 */
#define IDX_IO_REC_DMA_CURROFS  0x34 /* PU:0x00000000 */
#define IDX_IO_REC_SOUNDFORMAT  0x36 /* PU:0x0000 */

/** hmm, what is this I/O area for? MPU401?? or external DAC via I2S?? (after playback, recording, ???, timer) **/
#define IDX_IO_SOMETHING_FLAGS      0x40 /* gets set to 0x34 just like port 0x0 and 0x20 on card init, PU:0x0000 */
/* general */
#define IDX_IO_42H            0x42 /* PU:0x0001 */

/** DirectX timer, main interrupt area (FIXME: and something else?) **/ 
#define IDX_IO_TIMER_VALUE    0x60 /* found this timer area by pure luck :-) */
  /* timer countdown value; triggers IRQ when timer is finished */
  #define TIMER_VALUE_MASK          0x000fffffUL
  /* activate timer countdown */
  #define TIMER_COUNTDOWN_ENABLE    0x01000000UL
  /* trigger timer IRQ on zero transition */
  #define TIMER_IRQ_ENABLE          0x02000000UL
  /* being set in IRQ handler in case port 0x00 (hmm, not port 0x64!?!?)
   * had 0x0020 set upon IRQ handler */
  #define TIMER_IRQ_ACK             0x04000000UL
#define IDX_IO_IRQSTATUS        0x64
  /* some IRQ bit in here might also be used to signal a power-management timer
   * timeout, to request shutdown of the chip (e.g. AD1815JS has such a thing).
   * Some OPL3 hardware (e.g. in LM4560) has some special timer hardware which
   * can trigger an OPL3 timer IRQ, so maybe there's such a thing as well... */

  #define IRQ_PLAYBACK  0x0001
  #define IRQ_RECORDING 0x0002
  #define IRQ_UNKNOWN1  0x0004 /* most probably I2S port */
  #define IRQ_GAMEPORT  0x0008 /* Interrupt of Digital(ly) Enhanced Game Port */
  #define IRQ_MPU401    0x0010
  #define IRQ_TIMER     0x0020 /* DirectX timer */
  #define IRQ_UNKNOWN2  0x0040 /* probably unused, or possibly I2S port? */
  #define IRQ_UNKNOWN3  0x0080 /* probably unused, or possibly I2S port? */
#define IDX_IO_66H            0x66    /* writing 0xffff returns 0x0000 */
  /* this is set to e.g. 0x3ff or 0x300, and writable;
   * maybe some buffer limit, but I couldn't find out more, PU:0x00ff: */
#define IDX_IO_SOME_VALUE     0x68
  #define IO_68_RANDOM_TOGGLE1      0x0100      /* toggles randomly */
  #define IO_68_RANDOM_TOGGLE2      0x0200      /* toggles randomly */
  /* umm, nope, behaviour of these bits changes depending on what we wrote
   * to 0x6b!!
   * And they change upon playback/stop, too:
   * Writing a value to 0x68 will display this exact value during playback,
   * too but when stopped it can fall back to a rather different
   * seemingly random value). Hmm, possibly this is a register which
   * has a remote shadow which needs proper device supply which only exists
   * in case playback is active? Or is this driver-induced?

/* this WORD can be set to have bits 0x0028 activated (FIXME: correct??);
 * actually inhibits PCM playback!!! maybe power management??: */
#define IDX_IO_6AH            0x6A /* WRITE_ONLY! */
  /* bit 5: enabling this will activate permanent counting of bytes 2/3
   * at gameport I/O (0xb402/3) (equal values each) and cause
   * gameport legacy I/O at 0x0200 to be _DISABLED_!
   * Is this Digital Enhanced Game Port Enable??? Or maybe it's Testmode
   * for Enhanced Digital Gameport (see 4D Wave DX card): */
  #define IO_6A_SOMETHING1_GAMEPORT 0x0020
  /* bit 8; sure, this _pauses_ playback (later resumes at same spot!),
   * but what the heck is this really about??: */
  #define IO_6A_PAUSE_PLAYBACK_BIT8 0x0100
  /* bit 9; sure, this _pauses_ playback (later resumes at same spot!),
   * but what the heck is this really about??: */
  #define IO_6A_PAUSE_PLAYBACK_BIT9 0x0200
      /* BIT8 and BIT9 are _NOT_ able to affect OPL3 MIDI playback,
       * thus it suggests influence on PCM only!!
       * However OTOH there seems to be no bit anywhere around here
       * which is able to disable OPL3... */
  /* bit 10: enabling this actually changes values at legacy gameport
   * I/O address (0x200); is this enabling of the Digital Enhanced Game Port???
   * Or maybe this simply switches off the NE558 circuit, since enabling this
   * still lets us evaluate button states, but not axis states */
  #define IO_6A_SOMETHING2_GAMEPORT      0x0400
      /* writing 0x0300: causes quite some crackling during
       * PC activity such as switching windows (PCI traffic??
       * --> FIFO/timing settings???) */
      /* writing 0x0100 plus/or 0x0200 inhibits playback */
      /* since the Windows .INF file has Flag_Enable_JoyStick and
       * Flag_Enable_SB_DOS_Emulation directly together, it stands to reason
       * that some other bit in this same register might be responsible
       * for SB DOS Emulation activation (note that the file did NOT define
       * a switch for OPL3!) */
#define IDX_IO_6CH            0x6C  /* unknown; fully read-writable */
#define IDX_IO_6EH            0x6E
      /* writing 0xffff returns 0x83fe (or 0x03fe only).
       * writing 0x83 (and only 0x83!!) to 0x6f will cause 0x6c to switch
       * from 0000 to ffff. */

/* further I/O indices not saved/restored and not readable after writing,
 * so probably not used */

/*** Gameport area port indices ***/
/* (only 0x06 of 0x08 bytes saved/restored by Windows driver) */ 
#define AZF_IO_SIZE_GAME            0x08
#define AZF_IO_SIZE_GAME_PM   0x06

enum {

      /* in some operation mode, writing anything to this port
       * triggers an interrupt:
       * yup, that's in case IDX_GAME_01H has one of the
       * axis measurement bits enabled
       * (and of course one needs to have GAME_HWCFG_IRQ_ENABLE, too) */

#define IDX_GAME_AXES_CONFIG            0x01
      /* NOTE: layout of this register awfully similar (read: "identical??")
       * to AD1815JS.pdf (p.29) */

  /* enables axis 1 (X axis) measurement: */
  #define GAME_AXES_ENABLE_1        0x01
  /* enables axis 2 (Y axis) measurement: */
  #define GAME_AXES_ENABLE_2        0x02
  /* enables axis 3 (X axis) measurement: */
  #define GAME_AXES_ENABLE_3        0x04
  /* enables axis 4 (Y axis) measurement: */
  #define GAME_AXES_ENABLE_4        0x08
  /* selects the current axis to read the measured value of
   * 00 = axis 1, 01 = axis 2, 10 = axis 3, 11 = axis 4: */
  #define GAME_AXES_READ_MASK       0x30
  /* enable to have the latch continuously accept ADC values
   * (and continuously cause interrupts in case interrupts are enabled);
   * AD1815JS.pdf says it's ~16ms interval there: */
  #define GAME_AXES_LATCH_ENABLE    0x40
  /* joystick data (measured axes) ready for reading: */

  /* NOTE: other card specs (SiS960 and others!) state that the
   * game position latches should be frozen when reading and be freed
   * (== reset?) after reading!!!
   * Freezing most likely means disabling 0x40 (GAME_AXES_LATCH_ENABLE),
   *  but how to free the value? */
  /* An internet search for "gameport latch ADC" should provide some insight
   * into how to program such a gameport system. */

  /* writing 0xf0 to 01H once reset both counters to 0, in some special mode!?
   * yup, in case 6AH 0x20 is not enabled
   * (and 0x40 is sufficient, 0xf0 is not needed) */

#define IDX_GAME_AXIS_VALUE   0x02
      /* R: value of currently configured axis (word value!);
       * W: trigger axis measurement */

#define IDX_GAME_HWCONFIG     0x04
      /* note: bits 4 to 7 are never set (== 0) when reading!
       * --> reserved bits? */
  /* enables IRQ notification upon axes measurement ready: */
  #define GAME_HWCFG_IRQ_ENABLE                 0x01
  /* these bits choose a different frequency for the
   *  internal ADC counter increment.
   * hmm, seems to be a combo of bits:
   * 00 --> standard frequency
   * 10 --> 1/2
   * 01 --> 1/20
   * 11 --> 1/200: */

  /* enable gameport legacy I/O address (0x200)
   * I was unable to locate any configurability for a different address: */

/*** MPU401 ***/
#define AZF_IO_SIZE_MPU       0x04
#define AZF_IO_SIZE_MPU_PM    0x04

/*** OPL3 synth ***/
#define AZF_IO_SIZE_OPL3      0x08
#define AZF_IO_SIZE_OPL3_PM   0x06
/* hmm, given that a standard OPL3 has 4 registers only,
 * there might be some enhanced functionality lurking at the end
 * (especially since register 0x04 has a "non-empty" value 0xfe) */

/*** mixer I/O area port indices ***/
/* (only 0x22 of 0x40 bytes saved/restored by Windows driver)
 * UNFORTUNATELY azf3328 is NOT truly AC97 compliant: see main file intro */
#define AZF_IO_SIZE_MIXER     0x40
#define AZF_IO_SIZE_MIXER_PM  0x22

  #define MIXER_VOLUME_RIGHT_MASK   0x001f
  #define MIXER_VOLUME_LEFT_MASK    0x1f00
  #define MIXER_MUTE_MASK           0x8000
#define IDX_MIXER_RESET       0x00 /* does NOT seem to have AC97 ID bits */
#define IDX_MIXER_PLAY_MASTER   0x02
#define IDX_MIXER_MODEMOUT      0x04
#define IDX_MIXER_BASSTREBLE    0x06
#define IDX_MIXER_PCBEEP        0x08
#define IDX_MIXER_MODEMIN       0x0a
#define IDX_MIXER_MIC           0x0c
#define IDX_MIXER_LINEIN        0x0e
#define IDX_MIXER_CDAUDIO       0x10
#define IDX_MIXER_VIDEO         0x12
#define IDX_MIXER_AUX           0x14
#define IDX_MIXER_WAVEOUT       0x16
#define IDX_MIXER_FMSYNTH       0x18
#define IDX_MIXER_REC_SELECT    0x1a
  #define MIXER_REC_SELECT_MIC            0x00
  #define MIXER_REC_SELECT_CD       0x01
  #define MIXER_REC_SELECT_VIDEO    0x02
  #define MIXER_REC_SELECT_AUX            0x03
  #define MIXER_REC_SELECT_LINEIN   0x04
  #define MIXER_REC_SELECT_MIXSTEREO      0x05
  #define MIXER_REC_SELECT_MONOIN   0x07
#define IDX_MIXER_REC_VOLUME    0x1c
#define IDX_MIXER_ADVCTL1       0x1e
  /* unlisted bits are unmodifiable */
  #define MIXER_ADVCTL1_3DWIDTH_MASK      0x000e
  #define MIXER_ADVCTL1_HIFI3D_MASK 0x0300 /* yup, this is missing the high bit that official AC97 contains, plus it doesn't have linear bit value range behaviour but instead acts weirdly (possibly we're dealing with two *different* 3D settings here??) */
#define IDX_MIXER_ADVCTL2       0x20 /* subset of AC97_GENERAL_PURPOSE reg! */
  /* unlisted bits are unmodifiable */
  #define MIXER_ADVCTL2_LPBK        0x0080 /* Loopback mode -- Win driver: "WaveOut3DBypass"? mutes WaveOut at LineOut */
  #define MIXER_ADVCTL2_MS          0x0100 /* Mic Select 0=Mic1, 1=Mic2 -- Win driver: "ModemOutSelect"?? */
  #define MIXER_ADVCTL2_MIX         0x0200 /* Mono output select 0=Mix, 1=Mic; Win driver: "MonoSelectSource"?? */
  #define MIXER_ADVCTL2_3D          0x2000 /* 3D Enhancement 1=on */
  #define MIXER_ADVCTL2_POP         0x8000 /* Pcm Out Path, 0=pre 3D, 1=post 3D */
#define IDX_MIXER_SOMETHING30H      0x30 /* used, but unknown??? */

/* driver internal flags */
#define SET_CHAN_LEFT   1
#define SET_CHAN_RIGHT  2

#endif /* __SOUND_AZT3328_H  */

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