1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Driver for Digigram VX soundcards
4 *
5 * IEC958 stuff
6 *
7 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
8 */
9
10 #include <linux/delay.h>
11 #include <sound/core.h>
12 #include <sound/vx_core.h>
13 #include "vx_cmd.h"
14
15
16 /*
17 * vx_modify_board_clock - tell the board that its clock has been modified
18 * @sync: DSP needs to resynchronize its FIFO
19 */
20 static int vx_modify_board_clock(struct vx_core *chip, int sync)
21 {
22 struct vx_rmh rmh;
23
24 vx_init_rmh(&rmh, CMD_MODIFY_CLOCK);
25 /* Ask the DSP to resynchronize its FIFO. */
26 if (sync)
27 rmh.Cmd[0] |= CMD_MODIFY_CLOCK_S_BIT;
28 return vx_send_msg(chip, &rmh);
29 }
30
31 /*
32 * vx_modify_board_inputs - resync audio inputs
33 */
34 static int vx_modify_board_inputs(struct vx_core *chip)
35 {
36 struct vx_rmh rmh;
37
38 vx_init_rmh(&rmh, CMD_RESYNC_AUDIO_INPUTS);
39 rmh.Cmd[0] |= 1 << 0; /* reference: AUDIO 0 */
40 return vx_send_msg(chip, &rmh);
41 }
42
43 /*
44 * vx_read_one_cbit - read one bit from UER config
45 * @index: the bit index
46 * returns 0 or 1.
47 */
48 static int vx_read_one_cbit(struct vx_core *chip, int index)
49 {
50 int val;
51
52 mutex_lock(&chip->lock);
53 if (chip->type >= VX_TYPE_VXPOCKET) {
54 vx_outb(chip, CSUER, 1); /* read */
55 vx_outb(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
56 val = (vx_inb(chip, RUER) >> 7) & 0x01;
57 } else {
58 vx_outl(chip, CSUER, 1); /* read */
59 vx_outl(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
60 val = (vx_inl(chip, RUER) >> 7) & 0x01;
61 }
62 mutex_unlock(&chip->lock);
63 return val;
64 }
65
66 /*
67 * vx_write_one_cbit - write one bit to UER config
68 * @index: the bit index
69 * @val: bit value, 0 or 1
70 */
71 static void vx_write_one_cbit(struct vx_core *chip, int index, int val)
72 {
73 val = !!val; /* 0 or 1 */
74 mutex_lock(&chip->lock);
75 if (vx_is_pcmcia(chip)) {
76 vx_outb(chip, CSUER, 0); /* write */
77 vx_outb(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
78 } else {
79 vx_outl(chip, CSUER, 0); /* write */
80 vx_outl(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
81 }
82 mutex_unlock(&chip->lock);
83 }
84
85 /*
86 * vx_read_uer_status - read the current UER status
87 * @mode: pointer to store the UER mode, VX_UER_MODE_XXX
88 *
89 * returns the frequency of UER, or 0 if not sync,
90 * or a negative error code.
91 */
92 static int vx_read_uer_status(struct vx_core *chip, unsigned int *mode)
93 {
94 int val, freq;
95
96 /* Default values */
97 freq = 0;
98
99 /* Read UER status */
100 if (vx_is_pcmcia(chip))
101 val = vx_inb(chip, CSUER);
102 else
103 val = vx_inl(chip, CSUER);
104 if (val < 0)
105 return val;
106 /* If clock is present, read frequency */
107 if (val & VX_SUER_CLOCK_PRESENT_MASK) {
108 switch (val & VX_SUER_FREQ_MASK) {
109 case VX_SUER_FREQ_32KHz_MASK:
110 freq = 32000;
111 break;
112 case VX_SUER_FREQ_44KHz_MASK:
113 freq = 44100;
114 break;
115 case VX_SUER_FREQ_48KHz_MASK:
116 freq = 48000;
117 break;
118 }
119 }
120 if (val & VX_SUER_DATA_PRESENT_MASK)
121 /* bit 0 corresponds to consumer/professional bit */
122 *mode = vx_read_one_cbit(chip, 0) ?
123 VX_UER_MODE_PROFESSIONAL : VX_UER_MODE_CONSUMER;
124 else
125 *mode = VX_UER_MODE_NOT_PRESENT;
126
127 return freq;
128 }
129
130
131 /*
132 * compute the sample clock value from frequency
133 *
134 * The formula is as follows:
135 *
136 * HexFreq = (dword) ((double) ((double) 28224000 / (double) Frequency))
137 * switch ( HexFreq & 0x00000F00 )
138 * case 0x00000100: ;
139 * case 0x00000200:
140 * case 0x00000300: HexFreq -= 0x00000201 ;
141 * case 0x00000400:
142 * case 0x00000500:
143 * case 0x00000600:
144 * case 0x00000700: HexFreq = (dword) (((double) 28224000 / (double) (Frequency*2)) - 1)
145 * default : HexFreq = (dword) ((double) 28224000 / (double) (Frequency*4)) - 0x000001FF
146 */
147
148 static int vx_calc_clock_from_freq(struct vx_core *chip, int freq)
149 {
150 int hexfreq;
151
152 if (snd_BUG_ON(freq <= 0))
153 return 0;
154
155 hexfreq = (28224000 * 10) / freq;
156 hexfreq = (hexfreq + 5) / 10;
157
158 /* max freq = 55125 Hz */
159 if (snd_BUG_ON(hexfreq <= 0x00000200))
160 return 0;
161
162 if (hexfreq <= 0x03ff)
163 return hexfreq - 0x00000201;
164 if (hexfreq <= 0x07ff)
165 return (hexfreq / 2) - 1;
166 if (hexfreq <= 0x0fff)
167 return (hexfreq / 4) + 0x000001ff;
168
169 return 0x5fe; /* min freq = 6893 Hz */
170 }
171
172
173 /*
174 * vx_change_clock_source - change the clock source
175 * @source: the new source
176 */
177 static void vx_change_clock_source(struct vx_core *chip, int source)
178 {
179 /* we mute DAC to prevent clicks */
180 vx_toggle_dac_mute(chip, 1);
181 mutex_lock(&chip->lock);
182 chip->ops->set_clock_source(chip, source);
183 chip->clock_source = source;
184 mutex_unlock(&chip->lock);
185 /* unmute */
186 vx_toggle_dac_mute(chip, 0);
187 }
188
189
190 /*
191 * set the internal clock
192 */
193 void vx_set_internal_clock(struct vx_core *chip, unsigned int freq)
194 {
195 int clock;
196
197 /* Get real clock value */
198 clock = vx_calc_clock_from_freq(chip, freq);
199 snd_printdd(KERN_DEBUG "set internal clock to 0x%x from freq %d\n", clock, freq);
200 mutex_lock(&chip->lock);
201 if (vx_is_pcmcia(chip)) {
202 vx_outb(chip, HIFREQ, (clock >> 8) & 0x0f);
203 vx_outb(chip, LOFREQ, clock & 0xff);
204 } else {
205 vx_outl(chip, HIFREQ, (clock >> 8) & 0x0f);
206 vx_outl(chip, LOFREQ, clock & 0xff);
207 }
208 mutex_unlock(&chip->lock);
209 }
210
211
212 /*
213 * set the iec958 status bits
214 * @bits: 32-bit status bits
215 */
216 void vx_set_iec958_status(struct vx_core *chip, unsigned int bits)
217 {
218 int i;
219
220 if (chip->chip_status & VX_STAT_IS_STALE)
221 return;
222
223 for (i = 0; i < 32; i++)
224 vx_write_one_cbit(chip, i, bits & (1 << i));
225 }
226
227
228 /*
229 * vx_set_clock - change the clock and audio source if necessary
230 */
231 int vx_set_clock(struct vx_core *chip, unsigned int freq)
232 {
233 int src_changed = 0;
234
235 if (chip->chip_status & VX_STAT_IS_STALE)
236 return 0;
237
238 /* change the audio source if possible */
239 vx_sync_audio_source(chip);
240
241 if (chip->clock_mode == VX_CLOCK_MODE_EXTERNAL ||
242 (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
243 chip->audio_source == VX_AUDIO_SRC_DIGITAL)) {
244 if (chip->clock_source != UER_SYNC) {
245 vx_change_clock_source(chip, UER_SYNC);
246 mdelay(6);
247 src_changed = 1;
248 }
249 } else if (chip->clock_mode == VX_CLOCK_MODE_INTERNAL ||
250 (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
251 chip->audio_source != VX_AUDIO_SRC_DIGITAL)) {
252 if (chip->clock_source != INTERNAL_QUARTZ) {
253 vx_change_clock_source(chip, INTERNAL_QUARTZ);
254 src_changed = 1;
255 }
256 if (chip->freq == freq)
257 return 0;
258 vx_set_internal_clock(chip, freq);
259 if (src_changed)
260 vx_modify_board_inputs(chip);
261 }
262 if (chip->freq == freq)
263 return 0;
264 chip->freq = freq;
265 vx_modify_board_clock(chip, 1);
266 return 0;
267 }
268
269
270 /*
271 * vx_change_frequency - called from interrupt handler
272 */
273 int vx_change_frequency(struct vx_core *chip)
274 {
275 int freq;
276
277 if (chip->chip_status & VX_STAT_IS_STALE)
278 return 0;
279
280 if (chip->clock_source == INTERNAL_QUARTZ)
281 return 0;
282 /*
283 * Read the real UER board frequency
284 */
285 freq = vx_read_uer_status(chip, &chip->uer_detected);
286 if (freq < 0)
287 return freq;
288 /*
289 * The frequency computed by the DSP is good and
290 * is different from the previous computed.
291 */
292 if (freq == 48000 || freq == 44100 || freq == 32000)
293 chip->freq_detected = freq;
294
295 return 0;
296 }
297
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.