sound/drivers/vx/vx_uer.c

   1 /*
   2  * Driver for Digigram VX soundcards
   3  *
   4  * IEC958 stuff
   5  *
   6  * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  */
  22
  23 #include <linux/delay.h>
  24 #include <sound/core.h>
  25 #include <sound/vx_core.h>
  26 #include "vx_cmd.h"
  27
  28
  29 /*
  30  * vx_modify_board_clock - tell the board that its clock has been modified
  31  * @sync: DSP needs to resynchronize its FIFO
  32  */
  33 static int vx_modify_board_clock(struct vx_core *chip, int sync)
  34 {
  35         struct vx_rmh rmh;
  36
  37         vx_init_rmh(&rmh, CMD_MODIFY_CLOCK);
  38         /* Ask the DSP to resynchronize its FIFO. */
  39         if (sync)
  40                 rmh.Cmd[0] |= CMD_MODIFY_CLOCK_S_BIT;
  41         return vx_send_msg(chip, &rmh);
  42 }
  43
  44 /*
  45  * vx_modify_board_inputs - resync audio inputs
  46  */
  47 static int vx_modify_board_inputs(struct vx_core *chip)
  48 {
  49         struct vx_rmh rmh;
  50
  51         vx_init_rmh(&rmh, CMD_RESYNC_AUDIO_INPUTS);
  52         rmh.Cmd[0] |= 1 << 0; /* reference: AUDIO 0 */
  53         return vx_send_msg(chip, &rmh);
  54 }
  55
  56 /*
  57  * vx_read_one_cbit - read one bit from UER config
  58  * @index: the bit index
  59  * returns 0 or 1.
  60  */
  61 static int vx_read_one_cbit(struct vx_core *chip, int index)
  62 {
  63         int val;
  64
  65         mutex_lock(&chip->lock);
  66         if (chip->type >= VX_TYPE_VXPOCKET) {
  67                 vx_outb(chip, CSUER, 1); /* read */
  68                 vx_outb(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
  69                 val = (vx_inb(chip, RUER) >> 7) & 0x01;
  70         } else {
  71                 vx_outl(chip, CSUER, 1); /* read */
  72                 vx_outl(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
  73                 val = (vx_inl(chip, RUER) >> 7) & 0x01;
  74         }
  75         mutex_unlock(&chip->lock);
  76         return val;
  77 }
  78
  79 /*
  80  * vx_write_one_cbit - write one bit to UER config
  81  * @index: the bit index
  82  * @val: bit value, 0 or 1
  83  */
  84 static void vx_write_one_cbit(struct vx_core *chip, int index, int val)
  85 {
  86         val = !!val;    /* 0 or 1 */
  87         mutex_lock(&chip->lock);
  88         if (vx_is_pcmcia(chip)) {
  89                 vx_outb(chip, CSUER, 0); /* write */
  90                 vx_outb(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
  91         } else {
  92                 vx_outl(chip, CSUER, 0); /* write */
  93                 vx_outl(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
  94         }
  95         mutex_unlock(&chip->lock);
  96 }
  97
  98 /*
  99  * vx_read_uer_status - read the current UER status
 100  * @mode: pointer to store the UER mode, VX_UER_MODE_XXX
 101  *
 102  * returns the frequency of UER, or 0 if not sync,
 103  * or a negative error code.
 104  */
 105 static int vx_read_uer_status(struct vx_core *chip, unsigned int *mode)
 106 {
 107         int val, freq;
 108
 109         /* Default values */
 110         freq = 0;
 111
 112         /* Read UER status */
 113         if (vx_is_pcmcia(chip))
 114             val = vx_inb(chip, CSUER);
 115         else
 116             val = vx_inl(chip, CSUER);
 117         if (val < 0)
 118                 return val;
 119         /* If clock is present, read frequency */
 120         if (val & VX_SUER_CLOCK_PRESENT_MASK) {
 121                 switch (val & VX_SUER_FREQ_MASK) {
 122                 case VX_SUER_FREQ_32KHz_MASK:
 123                         freq = 32000;
 124                         break;
 125                 case VX_SUER_FREQ_44KHz_MASK:
 126                         freq = 44100;
 127                         break;
 128                 case VX_SUER_FREQ_48KHz_MASK:
 129                         freq = 48000;
 130                         break;
 131                 }
 132         }
 133         if (val & VX_SUER_DATA_PRESENT_MASK)
 134                 /* bit 0 corresponds to consumer/professional bit */
 135                 *mode = vx_read_one_cbit(chip, 0) ?
 136                         VX_UER_MODE_PROFESSIONAL : VX_UER_MODE_CONSUMER;
 137         else
 138                 *mode = VX_UER_MODE_NOT_PRESENT;
 139
 140         return freq;
 141 }
 142
 143
 144 /*
 145  * compute the sample clock value from frequency
 146  *
 147  * The formula is as follows:
 148  *
 149  *    HexFreq = (dword) ((double) ((double) 28224000 / (double) Frequency))
 150  *    switch ( HexFreq & 0x00000F00 )
 151  *    case 0x00000100: ;
 152  *    case 0x00000200:
 153  *    case 0x00000300: HexFreq -= 0x00000201 ;
 154  *    case 0x00000400:
 155  *    case 0x00000500:
 156  *    case 0x00000600:
 157  *    case 0x00000700: HexFreq = (dword) (((double) 28224000 / (double) (Frequency*2)) - 1)
 158  *    default        : HexFreq = (dword) ((double) 28224000 / (double) (Frequency*4)) - 0x000001FF
 159  */
 160
 161 static int vx_calc_clock_from_freq(struct vx_core *chip, int freq)
 162 {
 163         int hexfreq;
 164
 165         if (snd_BUG_ON(freq <= 0))
 166                 return 0;
 167
 168         hexfreq = (28224000 * 10) / freq;
 169         hexfreq = (hexfreq + 5) / 10;
 170
 171         /* max freq = 55125 Hz */
 172         if (snd_BUG_ON(hexfreq <= 0x00000200))
 173                 return 0;
 174
 175         if (hexfreq <= 0x03ff)
 176                 return hexfreq - 0x00000201;
 177         if (hexfreq <= 0x07ff)
 178                 return (hexfreq / 2) - 1;
 179         if (hexfreq <= 0x0fff)
 180                 return (hexfreq / 4) + 0x000001ff;
 181
 182         return 0x5fe;   /* min freq = 6893 Hz */
 183 }
 184
 185
 186 /*
 187  * vx_change_clock_source - change the clock source
 188  * @source: the new source
 189  */
 190 static void vx_change_clock_source(struct vx_core *chip, int source)
 191 {
 192         /* we mute DAC to prevent clicks */
 193         vx_toggle_dac_mute(chip, 1);
 194         mutex_lock(&chip->lock);
 195         chip->ops->set_clock_source(chip, source);
 196         chip->clock_source = source;
 197         mutex_unlock(&chip->lock);
 198         /* unmute */
 199         vx_toggle_dac_mute(chip, 0);
 200 }
 201
 202
 203 /*
 204  * set the internal clock
 205  */
 206 void vx_set_internal_clock(struct vx_core *chip, unsigned int freq)
 207 {
 208         int clock;
 209
 210         /* Get real clock value */
 211         clock = vx_calc_clock_from_freq(chip, freq);
 212         snd_printdd(KERN_DEBUG "set internal clock to 0x%x from freq %d\n", clock, freq);
 213         mutex_lock(&chip->lock);
 214         if (vx_is_pcmcia(chip)) {
 215                 vx_outb(chip, HIFREQ, (clock >> 8) & 0x0f);
 216                 vx_outb(chip, LOFREQ, clock & 0xff);
 217         } else {
 218                 vx_outl(chip, HIFREQ, (clock >> 8) & 0x0f);
 219                 vx_outl(chip, LOFREQ, clock & 0xff);
 220         }
 221         mutex_unlock(&chip->lock);
 222 }
 223
 224
 225 /*
 226  * set the iec958 status bits
 227  * @bits: 32-bit status bits
 228  */
 229 void vx_set_iec958_status(struct vx_core *chip, unsigned int bits)
 230 {
 231         int i;
 232
 233         if (chip->chip_status & VX_STAT_IS_STALE)
 234                 return;
 235
 236         for (i = 0; i < 32; i++)
 237                 vx_write_one_cbit(chip, i, bits & (1 << i));
 238 }
 239
 240
 241 /*
 242  * vx_set_clock - change the clock and audio source if necessary
 243  */
 244 int vx_set_clock(struct vx_core *chip, unsigned int freq)
 245 {
 246         int src_changed = 0;
 247
 248         if (chip->chip_status & VX_STAT_IS_STALE)
 249                 return 0;
 250
 251         /* change the audio source if possible */
 252         vx_sync_audio_source(chip);
 253
 254         if (chip->clock_mode == VX_CLOCK_MODE_EXTERNAL ||
 255             (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
 256              chip->audio_source == VX_AUDIO_SRC_DIGITAL)) {
 257                 if (chip->clock_source != UER_SYNC) {
 258                         vx_change_clock_source(chip, UER_SYNC);
 259                         mdelay(6);
 260                         src_changed = 1;
 261                 }
 262         } else if (chip->clock_mode == VX_CLOCK_MODE_INTERNAL ||
 263                    (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
 264                     chip->audio_source != VX_AUDIO_SRC_DIGITAL)) {
 265                 if (chip->clock_source != INTERNAL_QUARTZ) {
 266                         vx_change_clock_source(chip, INTERNAL_QUARTZ);
 267                         src_changed = 1;
 268                 }
 269                 if (chip->freq == freq)
 270                         return 0;
 271                 vx_set_internal_clock(chip, freq);
 272                 if (src_changed)
 273                         vx_modify_board_inputs(chip);
 274         }
 275         if (chip->freq == freq)
 276                 return 0;
 277         chip->freq = freq;
 278         vx_modify_board_clock(chip, 1);
 279         return 0;
 280 }
 281
 282
 283 /*
 284  * vx_change_frequency - called from interrupt handler
 285  */
 286 int vx_change_frequency(struct vx_core *chip)
 287 {
 288         int freq;
 289
 290         if (chip->chip_status & VX_STAT_IS_STALE)
 291                 return 0;
 292
 293         if (chip->clock_source == INTERNAL_QUARTZ)
 294                 return 0;
 295         /*
 296          * Read the real UER board frequency
 297          */
 298         freq = vx_read_uer_status(chip, &chip->uer_detected);
 299         if (freq < 0)
 300                 return freq;
 301         /*
 302          * The frequency computed by the DSP is good and
 303          * is different from the previous computed.
 304          */
 305         if (freq == 48000 || freq == 44100 || freq == 32000)
 306                 chip->freq_detected = freq;
 307
 308         return 0;
 309 }