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Diffstat (limited to 'sound/oss/emu10k1/ecard.c')
| -rw-r--r-- | sound/oss/emu10k1/ecard.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/sound/oss/emu10k1/ecard.c b/sound/oss/emu10k1/ecard.c new file mode 100644 index 0000000..4ae635f --- /dev/null +++ b/sound/oss/emu10k1/ecard.c @@ -0,0 +1,157 @@ +/* + ********************************************************************** + * ecard.c - E-card initialization code + * Copyright 1999, 2000 Creative Labs, Inc. + * + ********************************************************************** + * + * Date Author Summary of changes + * ---- ------ ------------------ + * October 20, 1999 Bertrand Lee base code release + * + ********************************************************************** + * + * This program 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; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the Free + * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, + * USA. + * + ********************************************************************** + */ + +#include "ecard.h" +#include "hwaccess.h" + +/* Private routines */ +static void ecard_setadcgain(struct emu10k1_card *, struct ecard_state *, u16); +static void ecard_write(struct emu10k1_card *, u32); + +/************************************************************************** + * @func Set the gain of the ECARD's CS3310 Trim/gain controller. The + * trim value consists of a 16bit value which is composed of two + * 8 bit gain/trim values, one for the left channel and one for the + * right channel. The following table maps from the Gain/Attenuation + * value in decibels into the corresponding bit pattern for a single + * channel. + */ + +static void ecard_setadcgain(struct emu10k1_card *card, struct ecard_state *ecard, u16 gain) +{ + u32 currbit; + ecard->adc_gain = gain; + + /* Enable writing to the TRIM registers */ + ecard_write(card, ecard->control_bits & ~EC_TRIM_CSN); + + /* Do it again to insure that we meet hold time requirements */ + ecard_write(card, ecard->control_bits & ~EC_TRIM_CSN); + + for (currbit = (1L << 15); currbit; currbit >>= 1) { + + u32 value = ecard->control_bits & ~(EC_TRIM_CSN|EC_TRIM_SDATA); + + if (gain & currbit) + value |= EC_TRIM_SDATA; + + /* Clock the bit */ + ecard_write(card, value); + ecard_write(card, value | EC_TRIM_SCLK); + ecard_write(card, value); + } + + ecard_write(card, ecard->control_bits); +} + +/************************************************************************** + * @func Clock bits into the Ecard's control latch. The Ecard uses a + * control latch will is loaded bit-serially by toggling the Modem control + * lines from function 2 on the E8010. This function hides these details + * and presents the illusion that we are actually writing to a distinct + * register. + */ +static void ecard_write(struct emu10k1_card *card, u32 value) +{ + u16 count; + u32 data, hcvalue; + unsigned long flags; + + spin_lock_irqsave(&card->lock, flags); + + hcvalue = inl(card->iobase + HCFG) & ~(HOOKN_BIT|HANDN_BIT|PULSEN_BIT); + + outl(card->iobase + HCFG, hcvalue); + + for (count = 0 ; count < EC_NUM_CONTROL_BITS; count++) { + + /* Set up the value */ + data = ((value & 0x1) ? PULSEN_BIT : 0); + value >>= 1; + + outl(card->iobase + HCFG, hcvalue | data); + + /* Clock the shift register */ + outl(card->iobase + HCFG, hcvalue | data | HANDN_BIT); + outl(card->iobase + HCFG, hcvalue | data); + } + + /* Latch the bits */ + outl(card->iobase + HCFG, hcvalue | HOOKN_BIT); + outl(card->iobase + HCFG, hcvalue); + + spin_unlock_irqrestore(&card->lock, flags); +} + +void __devinit emu10k1_ecard_init(struct emu10k1_card *card) +{ + u32 hcvalue; + struct ecard_state ecard; + + /* Set up the initial settings */ + ecard.mux0_setting = EC_DEFAULT_SPDIF0_SEL; + ecard.mux1_setting = EC_DEFAULT_SPDIF1_SEL; + ecard.mux2_setting = 0; + ecard.adc_gain = EC_DEFAULT_ADC_GAIN; + ecard.control_bits = EC_RAW_RUN_MODE | + EC_SPDIF0_SELECT(ecard.mux0_setting) | + EC_SPDIF1_SELECT(ecard.mux1_setting); + + + /* Step 0: Set the codec type in the hardware control register + * and enable audio output */ + hcvalue = emu10k1_readfn0(card, HCFG); + emu10k1_writefn0(card, HCFG, hcvalue | HCFG_AUDIOENABLE | HCFG_CODECFORMAT_I2S); + + /* Step 1: Turn off the led and deassert TRIM_CS */ + ecard_write(card, EC_ADCCAL | EC_LEDN | EC_TRIM_CSN); + + /* Step 2: Calibrate the ADC and DAC */ + ecard_write(card, EC_DACCAL | EC_LEDN | EC_TRIM_CSN); + + /* Step 3: Wait for awhile; FIXME: Is this correct? */ + + current->state = TASK_INTERRUPTIBLE; + schedule_timeout(HZ); + + /* Step 4: Switch off the DAC and ADC calibration. Note + * That ADC_CAL is actually an inverted signal, so we assert + * it here to stop calibration. */ + ecard_write(card, EC_ADCCAL | EC_LEDN | EC_TRIM_CSN); + + /* Step 4: Switch into run mode */ + ecard_write(card, ecard.control_bits); + + /* Step 5: Set the analog input gain */ + ecard_setadcgain(card, &ecard, ecard.adc_gain); +} + + |
