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-rw-r--r--sound/oss/emu10k1/ecard.c157
1 files changed, 0 insertions, 157 deletions
diff --git a/sound/oss/emu10k1/ecard.c b/sound/oss/emu10k1/ecard.c
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--- a/sound/oss/emu10k1/ecard.c
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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 */
36static void ecard_setadcgain(struct emu10k1_card *, struct ecard_state *, u16);
37static 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
48static 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 */
82static 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
114void __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
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