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 <sound/driver.h>
  24 #include <linux/delay.h>
  25 #include <sound/core.h>
  26 #include <sound/vx_core.h>
  27 #include "vx_cmd.h"
  28
  29
  30 /*
  31  * vx_modify_board_clock - tell the board that its clock has been modified
  32  * @sync: DSP needs to resynchronize its FIFO
  33  */
  34 static int vx_modify_board_clock(struct vx_core *chip, int sync)
  35 {
  36         struct vx_rmh rmh;
  37
  38         vx_init_rmh(&rmh, CMD_MODIFY_CLOCK);
  39         /* Ask the DSP to resynchronize its FIFO. */
  40         if (sync)
  41                 rmh.Cmd[0] |= CMD_MODIFY_CLOCK_S_BIT;
  42         return vx_send_msg(chip, &rmh);
  43 }
  44
  45 /*
  46  * vx_modify_board_inputs - resync audio inputs
  47  */
  48 static int vx_modify_board_inputs(struct vx_core *chip)
  49 {
  50         struct vx_rmh rmh;
  51
  52         vx_init_rmh(&rmh, CMD_RESYNC_AUDIO_INPUTS);
  53         rmh.Cmd[0] |= 1 << 0; /* reference: AUDIO 0 */
  54         return vx_send_msg(chip, &rmh);
  55 }
  56
  57 /*
  58  * vx_read_one_cbit - read one bit from UER config
  59  * @index: the bit index
  60  * returns 0 or 1.
  61  */
  62 static int vx_read_one_cbit(struct vx_core *chip, int index)
  63 {
  64         unsigned long flags;
  65         int val;
  66         spin_lock_irqsave(&chip->lock, flags);
  67         if (chip->type >= VX_TYPE_VXPOCKET) {
  68                 vx_outb(chip, CSUER, 1); /* read */
  69                 vx_outb(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
  70                 val = (vx_inb(chip, RUER) >> 7) & 0x01;
  71         } else {
  72                 vx_outl(chip, CSUER, 1); /* read */
  73                 vx_outl(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
  74                 val = (vx_inl(chip, RUER) >> 7) & 0x01;
  75         }
  76         spin_unlock_irqrestore(&chip->lock, flags);
  77         return val;
  78 }
  79
  80 /*
  81  * vx_write_one_cbit - write one bit to UER config
  82  * @index: the bit index
  83  * @val: bit value, 0 or 1
  84  */
  85 static void vx_write_one_cbit(struct vx_core *chip, int index, int val)
  86 {
  87         unsigned long flags;
  88         val = !!val;    /* 0 or 1 */
  89         spin_lock_irqsave(&chip->lock, flags);
  90         if (vx_is_pcmcia(chip)) {
  91                 vx_outb(chip, CSUER, 0); /* write */
  92                 vx_outb(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
  93         } else {
  94                 vx_outl(chip, CSUER, 0); /* write */
  95                 vx_outl(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
  96         }
  97         spin_unlock_irqrestore(&chip->lock, flags);
  98 }
  99
 100 /*
 101  * vx_read_uer_status - read the current UER status
 102  * @mode: pointer to store the UER mode, VX_UER_MODE_XXX
 103  *
 104  * returns the frequency of UER, or 0 if not sync,
 105  * or a negative error code.
 106  */
 107 static int vx_read_uer_status(struct vx_core *chip, int *mode)
 108 {
 109         int val, freq;
 110
 111         /* Default values */
 112         freq = 0;
 113
 114         /* Read UER status */
 115         if (vx_is_pcmcia(chip))
 116             val = vx_inb(chip, CSUER);
 117         else
 118             val = vx_inl(chip, CSUER);
 119         if (val < 0)
 120                 return val;
 121         /* If clock is present, read frequency */
 122         if (val & VX_SUER_CLOCK_PRESENT_MASK) {
 123                 switch (val & VX_SUER_FREQ_MASK) {
 124                 case VX_SUER_FREQ_32KHz_MASK:
 125                         freq = 32000;
 126                         break;
 127                 case VX_SUER_FREQ_44KHz_MASK:
 128                         freq = 44100;
 129                         break;
 130                 case VX_SUER_FREQ_48KHz_MASK:
 131                         freq = 48000;
 132                         break;
 133                 }
 134         }
 135         if (val & VX_SUER_DATA_PRESENT_MASK)
 136                 /* bit 0 corresponds to consumer/professional bit */
 137                 *mode = vx_read_one_cbit(chip, 0) ?
 138                         VX_UER_MODE_PROFESSIONAL : VX_UER_MODE_CONSUMER;
 139         else
 140                 *mode = VX_UER_MODE_NOT_PRESENT;
 141
 142         return freq;
 143 }
 144
 145
 146 /*
 147  * compute the sample clock value from frequency
 148  *
 149  * The formula is as follows:
 150  *
 151  *    HexFreq = (dword) ((double) ((double) 28224000 / (double) Frequency))
 152  *    switch ( HexFreq & 0x00000F00 )
 153  *    case 0x00000100: ;
 154  *    case 0x00000200:
 155  *    case 0x00000300: HexFreq -= 0x00000201 ;
 156  *    case 0x00000400:
 157  *    case 0x00000500:
 158  *    case 0x00000600:
 159  *    case 0x00000700: HexFreq = (dword) (((double) 28224000 / (double) (Frequency*2)) - 1)
 160  *    default        : HexFreq = (dword) ((double) 28224000 / (double) (Frequency*4)) - 0x000001FF
 161  */
 162
 163 static int vx_calc_clock_from_freq(struct vx_core *chip, int freq)
 164 {
 165         int hexfreq;
 166
 167         snd_assert(freq > 0, return 0);
 168
 169         hexfreq = (28224000 * 10) / freq;
 170         hexfreq = (hexfreq + 5) / 10;
 171
 172         /* max freq = 55125 Hz */
 173         snd_assert(hexfreq > 0x00000200, 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         unsigned long flags;
 193
 194         /* we mute DAC to prevent clicks */
 195         vx_toggle_dac_mute(chip, 1);
 196         spin_lock_irqsave(&chip->lock, flags);
 197         chip->ops->set_clock_source(chip, source);
 198         chip->clock_source = source;
 199         spin_unlock_irqrestore(&chip->lock, flags);
 200         /* unmute */
 201         vx_toggle_dac_mute(chip, 0);
 202 }
 203
 204
 205 /*
 206  * set the internal clock
 207  */
 208 void vx_set_internal_clock(struct vx_core *chip, unsigned int freq)
 209 {
 210         int clock;
 211         unsigned long flags;
 212         /* Get real clock value */
 213         clock = vx_calc_clock_from_freq(chip, freq);
 214         snd_printdd(KERN_DEBUG "set internal clock to 0x%x from freq %d\n", clock, freq);
 215         spin_lock_irqsave(&chip->lock, flags);
 216         if (vx_is_pcmcia(chip)) {
 217                 vx_outb(chip, HIFREQ, (clock >> 8) & 0x0f);
 218                 vx_outb(chip, LOFREQ, clock & 0xff);
 219         } else {
 220                 vx_outl(chip, HIFREQ, (clock >> 8) & 0x0f);
 221                 vx_outl(chip, LOFREQ, clock & 0xff);
 222         }
 223         spin_unlock_irqrestore(&chip->lock, flags);
 224 }
 225
 226
 227 /*
 228  * set the iec958 status bits
 229  * @bits: 32-bit status bits
 230  */
 231 void vx_set_iec958_status(struct vx_core *chip, unsigned int bits)
 232 {
 233         int i;
 234
 235         if (chip->chip_status & VX_STAT_IS_STALE)
 236                 return;
 237
 238         for (i = 0; i < 32; i++)
 239                 vx_write_one_cbit(chip, i, bits & (1 << i));
 240 }
 241
 242
 243 /*
 244  * vx_set_clock - change the clock and audio source if necessary
 245  */
 246 int vx_set_clock(struct vx_core *chip, unsigned int freq)
 247 {
 248         int src_changed = 0;
 249
 250         if (chip->chip_status & VX_STAT_IS_STALE)
 251                 return 0;
 252
 253         /* change the audio source if possible */
 254         vx_sync_audio_source(chip);
 255
 256         if (chip->clock_mode == VX_CLOCK_MODE_EXTERNAL ||
 257             (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
 258              chip->audio_source == VX_AUDIO_SRC_DIGITAL)) {
 259                 if (chip->clock_source != UER_SYNC) {
 260                         vx_change_clock_source(chip, UER_SYNC);
 261                         mdelay(6);
 262                         src_changed = 1;
 263                 }
 264         } else if (chip->clock_mode == VX_CLOCK_MODE_INTERNAL ||
 265                    (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
 266                     chip->audio_source != VX_AUDIO_SRC_DIGITAL)) {
 267                 if (chip->clock_source != INTERNAL_QUARTZ) {
 268                         vx_change_clock_source(chip, INTERNAL_QUARTZ);
 269                         src_changed = 1;
 270                 }
 271                 if (chip->freq == freq)
 272                         return 0;
 273                 vx_set_internal_clock(chip, freq);
 274                 if (src_changed)
 275                         vx_modify_board_inputs(chip);
 276         }
 277         if (chip->freq == freq)
 278                 return 0;
 279         chip->freq = freq;
 280         vx_modify_board_clock(chip, 1);
 281         return 0;
 282 }
 283
 284
 285 /*
 286  * vx_change_frequency - called from interrupt handler
 287  */
 288 int vx_change_frequency(struct vx_core *chip)
 289 {
 290         int freq;
 291
 292         if (chip->chip_status & VX_STAT_IS_STALE)
 293                 return 0;
 294
 295         if (chip->clock_source == INTERNAL_QUARTZ)
 296                 return 0;
 297         /*
 298          * Read the real UER board frequency
 299          */
 300         freq = vx_read_uer_status(chip, &chip->uer_detected);
 301         if (freq < 0)
 302                 return freq;
 303         /*
 304          * The frequency computed by the DSP is good and
 305          * is different from the previous computed.
 306          */
 307         if (freq == 48000 || freq == 44100 || freq == 32000)
 308                 chip->freq_detected = freq;
 309
 310         return 0;
 311 }