summaryrefslogtreecommitdiff
path: root/sound/drivers/vx/vx_uer.c
blob: 884c40be19dc18d21b94f48e42eb90b71ab0e531 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Driver for Digigram VX soundcards
 *
 * IEC958 stuff
 *
 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
 */

#include <linux/delay.h>
#include <sound/core.h>
#include <sound/vx_core.h>
#include "vx_cmd.h"


/*
 * vx_modify_board_clock - tell the board that its clock has been modified
 * @sync: DSP needs to resynchronize its FIFO
 */
static int vx_modify_board_clock(struct vx_core *chip, int sync)
{
	struct vx_rmh rmh;

	vx_init_rmh(&rmh, CMD_MODIFY_CLOCK);
	/* Ask the DSP to resynchronize its FIFO. */
	if (sync)
		rmh.Cmd[0] |= CMD_MODIFY_CLOCK_S_BIT;
	return vx_send_msg(chip, &rmh);
}

/*
 * vx_modify_board_inputs - resync audio inputs
 */
static int vx_modify_board_inputs(struct vx_core *chip)
{
	struct vx_rmh rmh;

	vx_init_rmh(&rmh, CMD_RESYNC_AUDIO_INPUTS);
        rmh.Cmd[0] |= 1 << 0; /* reference: AUDIO 0 */
	return vx_send_msg(chip, &rmh);
}

/*
 * vx_read_one_cbit - read one bit from UER config
 * @index: the bit index
 * returns 0 or 1.
 */
static int vx_read_one_cbit(struct vx_core *chip, int index)
{
	int val;

	mutex_lock(&chip->lock);
	if (chip->type >= VX_TYPE_VXPOCKET) {
		vx_outb(chip, CSUER, 1); /* read */
		vx_outb(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
		val = (vx_inb(chip, RUER) >> 7) & 0x01;
	} else {
		vx_outl(chip, CSUER, 1); /* read */
		vx_outl(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
		val = (vx_inl(chip, RUER) >> 7) & 0x01;
	}
	mutex_unlock(&chip->lock);
	return val;
}

/*
 * vx_write_one_cbit - write one bit to UER config
 * @index: the bit index
 * @val: bit value, 0 or 1
 */
static void vx_write_one_cbit(struct vx_core *chip, int index, int val)
{
	val = !!val;	/* 0 or 1 */
	mutex_lock(&chip->lock);
	if (vx_is_pcmcia(chip)) {
		vx_outb(chip, CSUER, 0); /* write */
		vx_outb(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
	} else {
		vx_outl(chip, CSUER, 0); /* write */
		vx_outl(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
	}
	mutex_unlock(&chip->lock);
}

/*
 * vx_read_uer_status - read the current UER status
 * @mode: pointer to store the UER mode, VX_UER_MODE_XXX
 *
 * returns the frequency of UER, or 0 if not sync,
 * or a negative error code.
 */
static int vx_read_uer_status(struct vx_core *chip, unsigned int *mode)
{
	int val, freq;

	/* Default values */
	freq = 0;

	/* Read UER status */
	if (vx_is_pcmcia(chip))
	    val = vx_inb(chip, CSUER);
	else
	    val = vx_inl(chip, CSUER);
	if (val < 0)
		return val;
	/* If clock is present, read frequency */
	if (val & VX_SUER_CLOCK_PRESENT_MASK) {
		switch (val & VX_SUER_FREQ_MASK) {
		case VX_SUER_FREQ_32KHz_MASK:
			freq = 32000;
			break;
		case VX_SUER_FREQ_44KHz_MASK:
			freq = 44100;
			break;
		case VX_SUER_FREQ_48KHz_MASK:
			freq = 48000;
			break;
		}
        }
	if (val & VX_SUER_DATA_PRESENT_MASK)
		/* bit 0 corresponds to consumer/professional bit */
		*mode = vx_read_one_cbit(chip, 0) ?
			VX_UER_MODE_PROFESSIONAL : VX_UER_MODE_CONSUMER;
	else
		*mode = VX_UER_MODE_NOT_PRESENT;

	return freq;
}


/*
 * compute the sample clock value from frequency
 *
 * The formula is as follows:
 *
 *    HexFreq = (dword) ((double) ((double) 28224000 / (double) Frequency))
 *    switch ( HexFreq & 0x00000F00 )
 *    case 0x00000100: ;
 *    case 0x00000200:
 *    case 0x00000300: HexFreq -= 0x00000201 ;
 *    case 0x00000400:
 *    case 0x00000500:
 *    case 0x00000600:
 *    case 0x00000700: HexFreq = (dword) (((double) 28224000 / (double) (Frequency*2)) - 1)
 *    default        : HexFreq = (dword) ((double) 28224000 / (double) (Frequency*4)) - 0x000001FF
 */

static int vx_calc_clock_from_freq(struct vx_core *chip, int freq)
{
	int hexfreq;

	if (snd_BUG_ON(freq <= 0))
		return 0;

	hexfreq = (28224000 * 10) / freq;
	hexfreq = (hexfreq + 5) / 10;

	/* max freq = 55125 Hz */
	if (snd_BUG_ON(hexfreq <= 0x00000200))
		return 0;

	if (hexfreq <= 0x03ff)
		return hexfreq - 0x00000201;
	if (hexfreq <= 0x07ff) 
		return (hexfreq / 2) - 1;
	if (hexfreq <= 0x0fff)
		return (hexfreq / 4) + 0x000001ff;

	return 0x5fe; 	/* min freq = 6893 Hz */
}


/*
 * vx_change_clock_source - change the clock source
 * @source: the new source
 */
static void vx_change_clock_source(struct vx_core *chip, int source)
{
	/* we mute DAC to prevent clicks */
	vx_toggle_dac_mute(chip, 1);
	mutex_lock(&chip->lock);
	chip->ops->set_clock_source(chip, source);
	chip->clock_source = source;
	mutex_unlock(&chip->lock);
	/* unmute */
	vx_toggle_dac_mute(chip, 0);
}


/*
 * set the internal clock
 */
void vx_set_internal_clock(struct vx_core *chip, unsigned int freq)
{
	int clock;

	/* Get real clock value */
	clock = vx_calc_clock_from_freq(chip, freq);
	snd_printdd(KERN_DEBUG "set internal clock to 0x%x from freq %d\n", clock, freq);
	mutex_lock(&chip->lock);
	if (vx_is_pcmcia(chip)) {
		vx_outb(chip, HIFREQ, (clock >> 8) & 0x0f);
		vx_outb(chip, LOFREQ, clock & 0xff);
	} else {
		vx_outl(chip, HIFREQ, (clock >> 8) & 0x0f);
		vx_outl(chip, LOFREQ, clock & 0xff);
	}
	mutex_unlock(&chip->lock);
}


/*
 * set the iec958 status bits
 * @bits: 32-bit status bits
 */
void vx_set_iec958_status(struct vx_core *chip, unsigned int bits)
{
	int i;

	if (chip->chip_status & VX_STAT_IS_STALE)
		return;

	for (i = 0; i < 32; i++)
		vx_write_one_cbit(chip, i, bits & (1 << i));
}


/*
 * vx_set_clock - change the clock and audio source if necessary
 */
int vx_set_clock(struct vx_core *chip, unsigned int freq)
{
	int src_changed = 0;

	if (chip->chip_status & VX_STAT_IS_STALE)
		return 0;

	/* change the audio source if possible */
	vx_sync_audio_source(chip);

	if (chip->clock_mode == VX_CLOCK_MODE_EXTERNAL ||
	    (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
	     chip->audio_source == VX_AUDIO_SRC_DIGITAL)) {
		if (chip->clock_source != UER_SYNC) {
			vx_change_clock_source(chip, UER_SYNC);
			mdelay(6);
			src_changed = 1;
		}
	} else if (chip->clock_mode == VX_CLOCK_MODE_INTERNAL ||
		   (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
		    chip->audio_source != VX_AUDIO_SRC_DIGITAL)) {
		if (chip->clock_source != INTERNAL_QUARTZ) {
			vx_change_clock_source(chip, INTERNAL_QUARTZ);
			src_changed = 1;
		}
		if (chip->freq == freq)
			return 0;
		vx_set_internal_clock(chip, freq);
		if (src_changed)
			vx_modify_board_inputs(chip);
	}
	if (chip->freq == freq)
		return 0;
	chip->freq = freq;
	vx_modify_board_clock(chip, 1);
	return 0;
}


/*
 * vx_change_frequency - called from interrupt handler
 */
int vx_change_frequency(struct vx_core *chip)
{
	int freq;

	if (chip->chip_status & VX_STAT_IS_STALE)
		return 0;

	if (chip->clock_source == INTERNAL_QUARTZ)
		return 0;
	/*
	 * Read the real UER board frequency
	 */
	freq = vx_read_uer_status(chip, &chip->uer_detected);
	if (freq < 0)
		return freq;
	/*
	 * The frequency computed by the DSP is good and
	 * is different from the previous computed.
	 */
	if (freq == 48000 || freq == 44100 || freq == 32000)
		chip->freq_detected = freq;

	return 0;
}