1 // SPDX-License-Identifier: GPL-2.0-or-later
17  * vx_modify_board_clock - tell the board that its clock has been modified
18  * @sync: DSP needs to resynchronize its FIFO
20 static int vx_modify_board_clock(struct vx_core *chip, int sync)  in vx_modify_board_clock()  argument
26 	if (sync)  in vx_modify_board_clock()
32  * vx_modify_board_inputs - resync audio inputs
44  * vx_read_one_cbit - read one bit from UER config
52 	mutex_lock(&chip->lock);  in vx_read_one_cbit()
53 	if (chip->type >= VX_TYPE_VXPOCKET) {  in vx_read_one_cbit()
62 	mutex_unlock(&chip->lock);  in vx_read_one_cbit()
67  * vx_write_one_cbit - write one bit to UER config
74 	mutex_lock(&chip->lock);  in vx_write_one_cbit()
82 	mutex_unlock(&chip->lock);  in vx_write_one_cbit()
86  * vx_read_uer_status - read the current UER status
89  * returns the frequency of UER, or 0 if not sync,
94 	int val, freq;  in vx_read_uer_status()  local
97 	freq = 0;  in vx_read_uer_status()
110 			freq = 32000;  in vx_read_uer_status()
113 			freq = 44100;  in vx_read_uer_status()
116 			freq = 48000;  in vx_read_uer_status()
127 	return freq;  in vx_read_uer_status()
140  *    case 0x00000300: HexFreq -= 0x00000201 ;
144  *    case 0x00000700: HexFreq = (dword) (((double) 28224000 / (double) (Frequency*2)) - 1)
145  *    default        : HexFreq = (dword) ((double) 28224000 / (double) (Frequency*4)) - 0x000001FF
148 static int vx_calc_clock_from_freq(struct vx_core *chip, int freq)  in vx_calc_clock_from_freq()  argument
152 	if (snd_BUG_ON(freq <= 0))  in vx_calc_clock_from_freq()
155 	hexfreq = (28224000 * 10) / freq;  in vx_calc_clock_from_freq()
158 	/* max freq = 55125 Hz */  in vx_calc_clock_from_freq()
163 		return hexfreq - 0x00000201;  in vx_calc_clock_from_freq()
165 		return (hexfreq / 2) - 1;  in vx_calc_clock_from_freq()
169 	return 0x5fe; 	/* min freq = 6893 Hz */  in vx_calc_clock_from_freq()
174  * vx_change_clock_source - change the clock source
181 	mutex_lock(&chip->lock);  in vx_change_clock_source()
182 	chip->ops->set_clock_source(chip, source);  in vx_change_clock_source()
183 	chip->clock_source = source;  in vx_change_clock_source()
184 	mutex_unlock(&chip->lock);  in vx_change_clock_source()
193 void vx_set_internal_clock(struct vx_core *chip, unsigned int freq)  in vx_set_internal_clock()  argument
198 	clock = vx_calc_clock_from_freq(chip, freq);  in vx_set_internal_clock()
199 	snd_printdd(KERN_DEBUG "set internal clock to 0x%x from freq %d\n", clock, freq);  in vx_set_internal_clock()
200 	mutex_lock(&chip->lock);  in vx_set_internal_clock()
208 	mutex_unlock(&chip->lock);  in vx_set_internal_clock()
214  * @bits: 32-bit status bits
220 	if (chip->chip_status & VX_STAT_IS_STALE)  in vx_set_iec958_status()
229  * vx_set_clock - change the clock and audio source if necessary
231 int vx_set_clock(struct vx_core *chip, unsigned int freq)  in vx_set_clock()  argument
235 	if (chip->chip_status & VX_STAT_IS_STALE)  in vx_set_clock()
241 	if (chip->clock_mode == VX_CLOCK_MODE_EXTERNAL ||  in vx_set_clock()
242 	    (chip->clock_mode == VX_CLOCK_MODE_AUTO &&  in vx_set_clock()
243 	     chip->audio_source == VX_AUDIO_SRC_DIGITAL)) {  in vx_set_clock()
244 		if (chip->clock_source != UER_SYNC) {  in vx_set_clock()
249 	} else if (chip->clock_mode == VX_CLOCK_MODE_INTERNAL ||  in vx_set_clock()
250 		   (chip->clock_mode == VX_CLOCK_MODE_AUTO &&  in vx_set_clock()
251 		    chip->audio_source != VX_AUDIO_SRC_DIGITAL)) {  in vx_set_clock()
252 		if (chip->clock_source != INTERNAL_QUARTZ) {  in vx_set_clock()
256 		if (chip->freq == freq)  in vx_set_clock()
258 		vx_set_internal_clock(chip, freq);  in vx_set_clock()
262 	if (chip->freq == freq)  in vx_set_clock()
264 	chip->freq = freq;  in vx_set_clock()
271  * vx_change_frequency - called from interrupt handler
275 	int freq;  in vx_change_frequency()  local
277 	if (chip->chip_status & VX_STAT_IS_STALE)  in vx_change_frequency()
280 	if (chip->clock_source == INTERNAL_QUARTZ)  in vx_change_frequency()
285 	freq = vx_read_uer_status(chip, &chip->uer_detected);  in vx_change_frequency()
286 	if (freq < 0)  in vx_change_frequency()
287 		return freq;  in vx_change_frequency()
292 	if (freq == 48000 || freq == 44100 || freq == 32000)  in vx_change_frequency()
293 		chip->freq_detected = freq;  in vx_change_frequency()