kolibrios/programs/media/ac97wav/trunk/codec.inc

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NAMBAR_read_byte:
add dx, [NAMBAR]
in al, dx
ret
NAMBAR_read_word:
add dx, [NAMBAR]
in ax, dx
ret
NAMBAR_read_dword:
add dx, [NAMBAR]
in eax, dx
ret
NAMBAR_write_byte:
add dx, [NAMBAR]
out dx, al
ret
NAMBAR_write_word:
add dx, [NAMBAR]
out dx, ax
ret
NAMBAR_write_dword:
add dx, [NAMBAR]
out dx, eax
ret
NABMBAR_read_byte:
add dx, [NABMBAR]
in al, dx
ret
NABMBAR_read_word:
add dx, [NABMBAR]
in ax, dx
ret
NABMBAR_read_dword:
add dx, [NABMBAR]
in eax, dx
ret
NABMBAR_write_byte:
add dx, [NABMBAR]
out dx, al
ret
NABMBAR_write_word:
add dx, [NABMBAR]
out dx, ax
ret
NABMBAR_write_dword:
add dx, [NABMBAR]
out dx, eax
ret
semaphore:
push ecx edx
mov edx, GLOB_STS_REG ; 0x30 global status register
call NABMBAR_read_dword
and eax, PRI_CODEC_RDY ; 100h primary codec ready
jz .success ; exit if codec not ready !!!
; mov ecx, 1024 ; try 1024 times
mov ecx, 0ffffh ; try 65535 times
.wait:
mov edx, ACC_SEMA_REG ; 0x34 codec write semaphore
call NABMBAR_read_byte
and al, CODEC_BUSY ; 01h codec access semaphore
jz .success ; exit if codec not busy !!!
dec ecx
jnz .wait
pop edx ecx
mov eax, 0
jmp .exit
.success:
pop edx ecx
mov eax, 1
.exit:
ret
codecStop:
push eax ebx edx
mov edx, PO_CR_REG ; 0x1B control register
mov al, 0 ; stop all PCM out data
call NABMBAR_write_byte
mcall MF_DELAY, eax ; ebx = (eax = MF_DELAY = 5); wait 50 ms
mov edx, PO_CR_REG ; 0x1B control register
mov al, RR ; reset PCM out regs
call NABMBAR_write_byte
mcall MF_DELAY, eax
pop edx ebx eax
ret
; set voulme
; in ax = volume level
setVolume:
push eax edx
push eax
call semaphore
mov edx, CODEC_RESET_REG ; 0
xor eax, eax ; register reset the codec
call NAMBAR_write_word
call semaphore
pop eax
imul ax, 0101h ; set volume for both chn
mov edx, CODEC_MASTER_VOL_REG ; 2
call NAMBAR_write_word
push eax
call semaphore
pop eax ; set volume for both chn
mov edx, CODEC_HP_VOL_REG ; 4
call NAMBAR_write_word
push eax
call semaphore
mov edx, CODEC_CD_VOL_REG ; 12h
pop eax ; set volume for both chn
shr eax, 2 ; adjust CD VOL
call NAMBAR_write_word
call semaphore
mov edx, CODEC_PCM_OUT_REG ; 18h
mov ax, 0808h ; standard PCM out volume
call NAMBAR_write_word
pop edx eax
ret
samplerate dw 0
; enable codec, unmute stuff, set output to desired rate
; in : ax = desired sample rate
; out: ax = true or false
;
codecConfig:
pushad
mov [samplerate], ax ; save sample rate
; mov edx, GLOB_STS_REG ; 30h global status register
; call NABMBAR_read_dword
; and eax, PRI_CODEC_RDY ; 0100h primary codec ready
; jnz skip_init ; skip init if codec ready !!!
; stop the codec if currently playing
;;; call codecStop
; mov edx, GLOB_STS_REG
; call NABMBAR_read_dword
; dps "GLOB_STA = "
; dph eax
; newline
; mov edx, GLOB_CNT_REG
; call NABMBAR_read_dword
; dps "GLOB_CNT = "
; dph eax
; newline
; mcall 5, 10
;; test eax, ACCOLD_RESET
;; jnz .skip_cold_reset
; print "cold reset"
; do a cold reset
mov edx, GLOB_CNT_REG ; 2ch global control register
xor eax, eax
call NABMBAR_write_dword ; enable (AC Link off clear)
; print "wait"
mcall 5, 5
; print "alive!"
;; .skip_cold_reset:
mov edx, GLOB_CNT_REG ; 2ch global control register
mov eax, ACCOLD_RESET + PRI_RES_EN ; cold reset + primary resume
call NABMBAR_write_dword ; 2 channels & 16 bit samples
mov edx, GLOB_CNT_REG ; 2ch global control register
call NABMBAR_read_dword
and eax, ACCOLD_RESET ; cold reset
jz init_error ; INIT FAILED !!!
; print "cold reset finished"
; wait for primary codec ready status
mov ecx, 128
codec_ready_loop:
mov edx, GLOB_STS_REG ; 30h global status register
call NABMBAR_read_dword
and eax, PRI_CODEC_RDY ; 0100h primary codec ready
jnz codec_ready_exit ; move on if codec ready !!!
mcall 5, 1
dec ecx
jnz codec_ready_loop
;dps "~"
codec_ready_exit:
; wait until codec init ready (*** replaces warm reset wait ***)
mcall 5, 60
; test if codec ready bit is finally set
mov edx, GLOB_STS_REG ; 30h global status register
call NABMBAR_read_dword
and eax, PRI_CODEC_RDY ; 0100h primary codec ready
jnz codec_ready_bit_set ; move on if codec ready !!!
cmp [AC97ICH4], 1
jne init_error
; je codec_ready_bit_set ; ignore codec ready for ICH4
; jmp init_error ; codec ready bit not set !!!
codec_ready_bit_set:
; clear semaphore flag
mov edx, CODEC_RESET_REG ; 0h codec reset register
call NAMBAR_read_word
; check if codec sections ready
call semaphore
test eax, eax
jz init_error
mov edx, CODEC_POWER_CTRL_REG ; 26h codec powerdown ctrl
call NAMBAR_read_word
and eax, 01111b
cmp eax, 01111b
jne init_error ; codec sections not ready
; disable interrupts
mov al, 0
mov edx, PI_CR_REG ; 0Bh PCM in control register
call NABMBAR_write_byte
mov edx, PO_CR_REG ; 1Bh PCM out control register
call NABMBAR_write_byte
mov edx, MC_CR_REG ; 2Bh MIC in control register
call NABMBAR_write_byte
; reset channels
mov al, RR ; 02h reset Bus master regs
mov edx, PI_CR_REG ; 0Bh PCM in control register
call NABMBAR_write_byte
mov edx, PO_CR_REG ; 1Bh PCM out control register
call NABMBAR_write_byte
mov edx, MC_CR_REG ; 2Bh MIC in control register
call NABMBAR_write_byte
; set default volume
mov eax, 15 ; set average volume level
call setVolume
; set VRA and clear DRA (if not supported will be skipped)
call semaphore
test eax, eax
jz init_error
mov edx, CODEC_EXT_AUDIO_CTRL_REG ; register 2ah
call NAMBAR_read_word ; get ext audio ctl
mov ebx, eax
call semaphore
test eax, eax
jz init_error
mov eax, ebx
and eax, 0FFFFh - BIT1 ; clear DRA (BIT1)
or eax, BIT0 ; set VRA (BIT0)
mov edx, CODEC_EXT_AUDIO_CTRL_REG ; register 2ah
call NAMBAR_write_word ; write ext audio ctl
; set desired sample rate
skip_init:
call semaphore
test eax, eax
jz init_error
; mov edx, CODEC_PCM_FRONT_DACRATE_REG
; call NAMBAR_read_word
; and eax, 0xFFFF
; newline
; dps "old PCM OUT RATE: "
; dpd eax
; newline
mov ax, [samplerate] ; restore sample rate
; mov edx, CODEC_PCM_FRONT_DACRATE_REG ; register 2ch
; call NAMBAR_write_word
call set_sample_rate
popad
mov eax, 1 ; exit with success
jmp exit_config
init_error:
popad
xor eax, eax ; exit with error
exit_config:
ret
set_sample_rate: ; rate in ax
mov edx, CODEC_PCM_FRONT_DACRATE_REG ; 0x2C reg
call NAMBAR_write_word
ret