sound/pci/azt3328.h - kernel/msm-4.19 - Gitiles

 #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_SUSPECTED_4000	0x0c | SOUNDFORMAT_XTAL1
     #define SOUNDFORMAT_FREQ_SUSPECTED_4800	0x0a | SOUNDFORMAT_XTAL1
     #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
   AZF_FREQ(4000),
   AZF_FREQ(4800),
   AZF_FREQ(5512),
   AZF_FREQ(6620),
   AZF_FREQ(8000),
   AZF_FREQ(9600),
   AZF_FREQ(11025),
   AZF_FREQ(13240),
   AZF_FREQ(16000),
   AZF_FREQ(22050),
   AZF_FREQ(32000),
   AZF_FREQ(44100),
   AZF_FREQ(48000),
   AZF_FREQ(66200),
 #undef AZF_FREQ
 } AZF_FREQUENCIES;

 /** 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 {
 	AZF_GAME_LEGACY_IO_PORT = 0x200
 } AZF_GAME_CONFIGS;

 #define IDX_GAME_LEGACY_COMPATIBLE	0x00
 	/* 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
    * (at IDX_GAME_AXIS_VALUE):
    * 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: */
   #define GAME_AXES_SAMPLING_READY	0x80

   /* 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: */
   #define GAME_HWCFG_ADC_COUNTER_FREQ_MASK	0x06

   /* enable gameport legacy I/O address (0x200)
    * I was unable to locate any configurability for a different address: */
   #define GAME_HWCFG_LEGACY_ADDRESS_ENABLE	0x08

 /*** 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 MIXER_BASSTREBLE_TREBLE_VOLUME_MASK	0x000e
   #define MIXER_BASSTREBLE_BASS_VOLUME_MASK	0x0e00
 #define IDX_MIXER_PCBEEP        0x08
 #define IDX_MIXER_MODEMIN       0x0a
 #define IDX_MIXER_MIC           0x0c
   #define MIXER_MIC_MICGAIN_20DB_ENHANCEMENT_MASK	0x0040
 #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_MIXMONO	0x06
   #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  */
	#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_SUSPECTED_4000 0x0c \| SOUNDFORMAT_XTAL1
	#define SOUNDFORMAT_FREQ_SUSPECTED_4800 0x0a \| SOUNDFORMAT_XTAL1
	#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
	AZF_FREQ(4000),
	AZF_FREQ(4800),
	AZF_FREQ(5512),
	AZF_FREQ(6620),
	AZF_FREQ(8000),
	AZF_FREQ(9600),
	AZF_FREQ(11025),
	AZF_FREQ(13240),
	AZF_FREQ(16000),
	AZF_FREQ(22050),
	AZF_FREQ(32000),
	AZF_FREQ(44100),
	AZF_FREQ(48000),
	AZF_FREQ(66200),
	#undef AZF_FREQ
	} AZF_FREQUENCIES;

	/ 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 {
	AZF_GAME_LEGACY_IO_PORT = 0x200
	} AZF_GAME_CONFIGS;

	#define IDX_GAME_LEGACY_COMPATIBLE 0x00
	/* 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
	* (at IDX_GAME_AXIS_VALUE):
	* 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: */
	#define GAME_AXES_SAMPLING_READY 0x80

	/* 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: */
	#define GAME_HWCFG_ADC_COUNTER_FREQ_MASK 0x06

	/* enable gameport legacy I/O address (0x200)
	* I was unable to locate any configurability for a different address: */
	#define GAME_HWCFG_LEGACY_ADDRESS_ENABLE 0x08

	/* 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 MIXER_BASSTREBLE_TREBLE_VOLUME_MASK 0x000e
	#define MIXER_BASSTREBLE_BASS_VOLUME_MASK 0x0e00
	#define IDX_MIXER_PCBEEP 0x08
	#define IDX_MIXER_MODEMIN 0x0a
	#define IDX_MIXER_MIC 0x0c
	#define MIXER_MIC_MICGAIN_20DB_ENHANCEMENT_MASK 0x0040
	#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_MIXMONO 0x06
	#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 */