20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
30  * vx_modify_board_clock - tell the board that its clock has been modified
45  * vx_modify_board_inputs - resync audio inputs
57  * vx_read_one_cbit - read one bit from UER config
65 	mutex_lock(&chip->lock);  in vx_read_one_cbit()
66 	if (chip->type >= VX_TYPE_VXPOCKET) {  in vx_read_one_cbit()
75 	mutex_unlock(&chip->lock);  in vx_read_one_cbit()
80  * vx_write_one_cbit - write one bit to UER config
87 	mutex_lock(&chip->lock);  in vx_write_one_cbit()
95 	mutex_unlock(&chip->lock);  in vx_write_one_cbit()
99  * vx_read_uer_status - read the current UER status
107 	int val, freq;  in vx_read_uer_status()  local
110 	freq = 0;  in vx_read_uer_status()
119 	/* If clock is present, read frequency */  in vx_read_uer_status()
123 			freq = 32000;  in vx_read_uer_status()
126 			freq = 44100;  in vx_read_uer_status()
129 			freq = 48000;  in vx_read_uer_status()
140 	return freq;  in vx_read_uer_status()
145  * compute the sample clock value from frequency
153  *    case 0x00000300: HexFreq -= 0x00000201 ;
157  *    case 0x00000700: HexFreq = (dword) (((double) 28224000 / (double) (Frequency*2)) - 1)
158  *    default        : HexFreq = (dword) ((double) 28224000 / (double) (Frequency*4)) - 0x000001FF
161 static int vx_calc_clock_from_freq(struct vx_core *chip, int freq)  in vx_calc_clock_from_freq()  argument
165 	if (snd_BUG_ON(freq <= 0))  in vx_calc_clock_from_freq()
168 	hexfreq = (28224000 * 10) / freq;  in vx_calc_clock_from_freq()
171 	/* max freq = 55125 Hz */  in vx_calc_clock_from_freq()
176 		return hexfreq - 0x00000201;  in vx_calc_clock_from_freq()
178 		return (hexfreq / 2) - 1;  in vx_calc_clock_from_freq()
182 	return 0x5fe; 	/* min freq = 6893 Hz */  in vx_calc_clock_from_freq()
187  * vx_change_clock_source - change the clock source
194 	mutex_lock(&chip->lock);  in vx_change_clock_source()
195 	chip->ops->set_clock_source(chip, source);  in vx_change_clock_source()
196 	chip->clock_source = source;  in vx_change_clock_source()
197 	mutex_unlock(&chip->lock);  in vx_change_clock_source()
204  * set the internal clock
206 void vx_set_internal_clock(struct vx_core *chip, unsigned int freq)  in vx_set_internal_clock()  argument
208 	int clock;  in vx_set_internal_clock()  local
210 	/* Get real clock value */  in vx_set_internal_clock()
211 	clock = vx_calc_clock_from_freq(chip, freq);  in vx_set_internal_clock()
212 	snd_printdd(KERN_DEBUG "set internal clock to 0x%x from freq %d\n", clock, freq);  in vx_set_internal_clock()
213 	mutex_lock(&chip->lock);  in vx_set_internal_clock()
215 		vx_outb(chip, HIFREQ, (clock >> 8) & 0x0f);  in vx_set_internal_clock()
216 		vx_outb(chip, LOFREQ, clock & 0xff);  in vx_set_internal_clock()
218 		vx_outl(chip, HIFREQ, (clock >> 8) & 0x0f);  in vx_set_internal_clock()
219 		vx_outl(chip, LOFREQ, clock & 0xff);  in vx_set_internal_clock()
221 	mutex_unlock(&chip->lock);  in vx_set_internal_clock()
227  * @bits: 32-bit status bits
233 	if (chip->chip_status & VX_STAT_IS_STALE)  in vx_set_iec958_status()
242  * vx_set_clock - change the clock and audio source if necessary
244 int vx_set_clock(struct vx_core *chip, unsigned int freq)  in vx_set_clock()  argument
248 	if (chip->chip_status & VX_STAT_IS_STALE)  in vx_set_clock()
254 	if (chip->clock_mode == VX_CLOCK_MODE_EXTERNAL ||  in vx_set_clock()
255 	    (chip->clock_mode == VX_CLOCK_MODE_AUTO &&  in vx_set_clock()
256 	     chip->audio_source == VX_AUDIO_SRC_DIGITAL)) {  in vx_set_clock()
257 		if (chip->clock_source != UER_SYNC) {  in vx_set_clock()
262 	} else if (chip->clock_mode == VX_CLOCK_MODE_INTERNAL ||  in vx_set_clock()
263 		   (chip->clock_mode == VX_CLOCK_MODE_AUTO &&  in vx_set_clock()
264 		    chip->audio_source != VX_AUDIO_SRC_DIGITAL)) {  in vx_set_clock()
265 		if (chip->clock_source != INTERNAL_QUARTZ) {  in vx_set_clock()
269 		if (chip->freq == freq)  in vx_set_clock()
271 		vx_set_internal_clock(chip, freq);  in vx_set_clock()
275 	if (chip->freq == freq)  in vx_set_clock()
277 	chip->freq = freq;  in vx_set_clock()
284  * vx_change_frequency - called from interrupt handler
288 	int freq;  in vx_change_frequency()  local
290 	if (chip->chip_status & VX_STAT_IS_STALE)  in vx_change_frequency()
293 	if (chip->clock_source == INTERNAL_QUARTZ)  in vx_change_frequency()
298 	freq = vx_read_uer_status(chip, &chip->uer_detected);  in vx_change_frequency()
299 	if (freq < 0)  in vx_change_frequency()
300 		return freq;  in vx_change_frequency()
305 	if (freq == 48000 || freq == 44100 || freq == 32000)  in vx_change_frequency()
306 		chip->freq_detected = freq;  in vx_change_frequency()