sound/oss/emu10k1/ecard.c

   1 /*
   2  **********************************************************************
   3  *     ecard.c - E-card initialization code
   4  *     Copyright 1999, 2000 Creative Labs, Inc.
   5  *
   6  **********************************************************************
   7  *
   8  *     Date                 Author          Summary of changes
   9  *     ----                 ------          ------------------
  10  *     October 20, 1999     Bertrand Lee    base code release
  11  *
  12  **********************************************************************
  13  *
  14  *     This program is free software; you can redistribute it and/or
  15  *     modify it under the terms of the GNU General Public License as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     This program is distributed in the hope that it will be useful,
  20  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *     GNU General Public License for more details.
  23  *
  24  *     You should have received a copy of the GNU General Public
  25  *     License along with this program; if not, write to the Free
  26  *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
  27  *     USA.
  28  *
  29  **********************************************************************
  30  */
  31
  32 #include "ecard.h"
  33 #include "hwaccess.h"
  34
  35 /* Private routines */
  36 static void ecard_setadcgain(struct emu10k1_card *, struct ecard_state *, u16);
  37 static void ecard_write(struct emu10k1_card *, u32);
  38
  39 /**************************************************************************
  40  * @func Set the gain of the ECARD's CS3310 Trim/gain controller.  The
  41  * trim value consists of a 16bit value which is composed of two
  42  * 8 bit gain/trim values, one for the left channel and one for the
  43  * right channel.  The following table maps from the Gain/Attenuation
  44  * value in decibels into the corresponding bit pattern for a single
  45  * channel.
  46  */
  47
  48 static void ecard_setadcgain(struct emu10k1_card *card, struct ecard_state *ecard, u16 gain)
  49 {
  50         u32 currbit;
  51         ecard->adc_gain = gain;
  52
  53         /* Enable writing to the TRIM registers */
  54         ecard_write(card, ecard->control_bits & ~EC_TRIM_CSN);
  55
  56         /* Do it again to insure that we meet hold time requirements */
  57         ecard_write(card, ecard->control_bits & ~EC_TRIM_CSN);
  58
  59         for (currbit = (1L << 15); currbit; currbit >>= 1) {
  60
  61                 u32 value = ecard->control_bits & ~(EC_TRIM_CSN|EC_TRIM_SDATA);
  62
  63                 if (gain & currbit)
  64                       value |= EC_TRIM_SDATA;
  65
  66                 /* Clock the bit */
  67                 ecard_write(card, value);
  68                 ecard_write(card, value | EC_TRIM_SCLK);
  69                 ecard_write(card, value);
  70         }
  71
  72         ecard_write(card, ecard->control_bits);
  73 }
  74
  75 /**************************************************************************
  76  * @func Clock bits into the Ecard's control latch.  The Ecard uses a
  77  *  control latch will is loaded bit-serially by toggling the Modem control
  78  *  lines from function 2 on the E8010.  This function hides these details
  79  *  and presents the illusion that we are actually writing to a distinct
  80  *  register.
  81  */
  82 static void ecard_write(struct emu10k1_card *card, u32 value)
  83 {
  84         u16 count;
  85         u32 data, hcvalue;
  86         unsigned long flags;
  87
  88         spin_lock_irqsave(&card->lock, flags);
  89
  90         hcvalue = inl(card->iobase + HCFG) & ~(HOOKN_BIT|HANDN_BIT|PULSEN_BIT);
  91
  92         outl(card->iobase + HCFG, hcvalue);
  93
  94         for (count = 0 ; count < EC_NUM_CONTROL_BITS; count++) {
  95
  96                 /* Set up the value */
  97                 data = ((value & 0x1) ? PULSEN_BIT : 0);
  98                 value >>= 1;
  99
 100                 outl(card->iobase + HCFG, hcvalue | data);
 101
 102                 /* Clock the shift register */
 103                 outl(card->iobase + HCFG, hcvalue | data | HANDN_BIT);
 104                 outl(card->iobase + HCFG, hcvalue | data);
 105         }
 106
 107         /* Latch the bits */
 108         outl(card->iobase + HCFG, hcvalue | HOOKN_BIT);
 109         outl(card->iobase + HCFG, hcvalue);
 110
 111         spin_unlock_irqrestore(&card->lock, flags);
 112 }
 113
 114 void __devinit emu10k1_ecard_init(struct emu10k1_card *card)
 115 {
 116         u32 hcvalue;
 117         struct ecard_state ecard;
 118
 119         /* Set up the initial settings */
 120         ecard.mux0_setting = EC_DEFAULT_SPDIF0_SEL;
 121         ecard.mux1_setting = EC_DEFAULT_SPDIF1_SEL;
 122         ecard.mux2_setting = 0;
 123         ecard.adc_gain = EC_DEFAULT_ADC_GAIN;
 124         ecard.control_bits = EC_RAW_RUN_MODE |
 125                              EC_SPDIF0_SELECT(ecard.mux0_setting) |
 126                              EC_SPDIF1_SELECT(ecard.mux1_setting);
 127
 128
 129         /* Step 0: Set the codec type in the hardware control register
 130          * and enable audio output */
 131         hcvalue = emu10k1_readfn0(card, HCFG);
 132         emu10k1_writefn0(card, HCFG, hcvalue | HCFG_AUDIOENABLE | HCFG_CODECFORMAT_I2S);
 133
 134         /* Step 1: Turn off the led and deassert TRIM_CS */
 135         ecard_write(card, EC_ADCCAL | EC_LEDN | EC_TRIM_CSN);
 136
 137         /* Step 2: Calibrate the ADC and DAC */
 138         ecard_write(card, EC_DACCAL | EC_LEDN | EC_TRIM_CSN);
 139
 140         /* Step 3: Wait for awhile; FIXME: Is this correct? */
 141
 142         current->state = TASK_INTERRUPTIBLE;
 143         schedule_timeout(HZ);
 144
 145         /* Step 4: Switch off the DAC and ADC calibration.  Note
 146          * That ADC_CAL is actually an inverted signal, so we assert
 147          * it here to stop calibration.  */
 148         ecard_write(card, EC_ADCCAL | EC_LEDN | EC_TRIM_CSN);
 149
 150         /* Step 4: Switch into run mode */
 151         ecard_write(card, ecard.control_bits);
 152
 153         /* Step 5: Set the analog input gain */
 154         ecard_setadcgain(card, &ecard, ecard.adc_gain);
 155 }
 156
 157