1 // SPDX-License-Identifier: GPL-2.0-or-later
17  * vx_modify_board_clock - tell the board that its clock has been modified
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,
106 	/* If clock is present, read frequency */  in vx_read_uer_status()
108 		switch (val & VX_SUER_FREQ_MASK) {  in vx_read_uer_status()
132  * compute the sample clock value from frequency
136  *    HexFreq = (dword) ((double) ((double) 28224000 / (double) Frequency))
137  *    switch ( HexFreq & 0x00000F00 )
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
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()
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
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()
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
277 	if (chip->chip_status & VX_STAT_IS_STALE)  in vx_change_frequency()
280 	if (chip->clock_source == INTERNAL_QUARTZ)  in vx_change_frequency()
283 	 * Read the real UER board frequency  in vx_change_frequency()
285 	freq = vx_read_uer_status(chip, &chip->uer_detected);  in vx_change_frequency()
289 	 * The frequency computed by the DSP is good and  in vx_change_frequency()
293 		chip->freq_detected = freq;  in vx_change_frequency()