2 **********************************************************************
3 * ecard.c - E-card initialization code
4 * Copyright 1999, 2000 Creative Labs, Inc.
6 **********************************************************************
8 * Date Author Summary of changes
9 * ---- ------ ------------------
10 * October 20, 1999 Bertrand Lee base code release
12 **********************************************************************
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.
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.
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,
29 **********************************************************************
35 /* Private routines */
36 static void ecard_setadcgain(struct emu10k1_card *, struct ecard_state *, u16);
37 static void ecard_write(struct emu10k1_card *, u32);
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
48 static void ecard_setadcgain(struct emu10k1_card *card, struct ecard_state *ecard, u16 gain)
51 ecard->adc_gain = gain;
53 /* Enable writing to the TRIM registers */
54 ecard_write(card, ecard->control_bits & ~EC_TRIM_CSN);
56 /* Do it again to insure that we meet hold time requirements */
57 ecard_write(card, ecard->control_bits & ~EC_TRIM_CSN);
59 for (currbit = (1L << 15); currbit; currbit >>= 1) {
61 u32 value = ecard->control_bits & ~(EC_TRIM_CSN|EC_TRIM_SDATA);
64 value |= EC_TRIM_SDATA;
67 ecard_write(card, value);
68 ecard_write(card, value | EC_TRIM_SCLK);
69 ecard_write(card, value);
72 ecard_write(card, ecard->control_bits);
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
82 static void ecard_write(struct emu10k1_card *card, u32 value)
88 spin_lock_irqsave(&card->lock, flags);
90 hcvalue = inl(card->iobase + HCFG) & ~(HOOKN_BIT|HANDN_BIT|PULSEN_BIT);
92 outl(card->iobase + HCFG, hcvalue);
94 for (count = 0 ; count < EC_NUM_CONTROL_BITS; count++) {
96 /* Set up the value */
97 data = ((value & 0x1) ? PULSEN_BIT : 0);
100 outl(card->iobase + HCFG, hcvalue | data);
102 /* Clock the shift register */
103 outl(card->iobase + HCFG, hcvalue | data | HANDN_BIT);
104 outl(card->iobase + HCFG, hcvalue | data);
108 outl(card->iobase + HCFG, hcvalue | HOOKN_BIT);
109 outl(card->iobase + HCFG, hcvalue);
111 spin_unlock_irqrestore(&card->lock, flags);
114 void __devinit emu10k1_ecard_init(struct emu10k1_card *card)
117 struct ecard_state ecard;
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);
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);
134 /* Step 1: Turn off the led and deassert TRIM_CS */
135 ecard_write(card, EC_ADCCAL | EC_LEDN | EC_TRIM_CSN);
137 /* Step 2: Calibrate the ADC and DAC */
138 ecard_write(card, EC_DACCAL | EC_LEDN | EC_TRIM_CSN);
140 /* Step 3: Wait for awhile; FIXME: Is this correct? */
142 current->state = TASK_INTERRUPTIBLE;
143 schedule_timeout(HZ);
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);
150 /* Step 4: Switch into run mode */
151 ecard_write(card, ecard.control_bits);
153 /* Step 5: Set the analog input gain */
154 ecard_setadcgain(card, &ecard, ecard.adc_gain);