--- /dev/null
+/*
+ * Driver for Digigram VX soundcards
+ *
+ * IEC958 stuff
+ *
+ * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/delay.h>
+#include <sound/core.h>
+#include <sound/vx_core.h>
+#include "vx_cmd.h"
+
+
+/*
+ * vx_modify_board_clock - tell the board that its clock has been modified
+ * @sync: DSP needs to resynchronize its FIFO
+ */
+static int vx_modify_board_clock(struct vx_core *chip, int sync)
+{
+ struct vx_rmh rmh;
+
+ vx_init_rmh(&rmh, CMD_MODIFY_CLOCK);
+ /* Ask the DSP to resynchronize its FIFO. */
+ if (sync)
+ rmh.Cmd[0] |= CMD_MODIFY_CLOCK_S_BIT;
+ return vx_send_msg(chip, &rmh);
+}
+
+/*
+ * vx_modify_board_inputs - resync audio inputs
+ */
+static int vx_modify_board_inputs(struct vx_core *chip)
+{
+ struct vx_rmh rmh;
+
+ vx_init_rmh(&rmh, CMD_RESYNC_AUDIO_INPUTS);
+ rmh.Cmd[0] |= 1 << 0; /* reference: AUDIO 0 */
+ return vx_send_msg(chip, &rmh);
+}
+
+/*
+ * vx_read_one_cbit - read one bit from UER config
+ * @index: the bit index
+ * returns 0 or 1.
+ */
+static int vx_read_one_cbit(struct vx_core *chip, int index)
+{
+ int val;
+
+ mutex_lock(&chip->lock);
+ if (chip->type >= VX_TYPE_VXPOCKET) {
+ vx_outb(chip, CSUER, 1); /* read */
+ vx_outb(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
+ val = (vx_inb(chip, RUER) >> 7) & 0x01;
+ } else {
+ vx_outl(chip, CSUER, 1); /* read */
+ vx_outl(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK);
+ val = (vx_inl(chip, RUER) >> 7) & 0x01;
+ }
+ mutex_unlock(&chip->lock);
+ return val;
+}
+
+/*
+ * vx_write_one_cbit - write one bit to UER config
+ * @index: the bit index
+ * @val: bit value, 0 or 1
+ */
+static void vx_write_one_cbit(struct vx_core *chip, int index, int val)
+{
+ val = !!val; /* 0 or 1 */
+ mutex_lock(&chip->lock);
+ if (vx_is_pcmcia(chip)) {
+ vx_outb(chip, CSUER, 0); /* write */
+ vx_outb(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
+ } else {
+ vx_outl(chip, CSUER, 0); /* write */
+ vx_outl(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK));
+ }
+ mutex_unlock(&chip->lock);
+}
+
+/*
+ * vx_read_uer_status - read the current UER status
+ * @mode: pointer to store the UER mode, VX_UER_MODE_XXX
+ *
+ * returns the frequency of UER, or 0 if not sync,
+ * or a negative error code.
+ */
+static int vx_read_uer_status(struct vx_core *chip, unsigned int *mode)
+{
+ int val, freq;
+
+ /* Default values */
+ freq = 0;
+
+ /* Read UER status */
+ if (vx_is_pcmcia(chip))
+ val = vx_inb(chip, CSUER);
+ else
+ val = vx_inl(chip, CSUER);
+ if (val < 0)
+ return val;
+ /* If clock is present, read frequency */
+ if (val & VX_SUER_CLOCK_PRESENT_MASK) {
+ switch (val & VX_SUER_FREQ_MASK) {
+ case VX_SUER_FREQ_32KHz_MASK:
+ freq = 32000;
+ break;
+ case VX_SUER_FREQ_44KHz_MASK:
+ freq = 44100;
+ break;
+ case VX_SUER_FREQ_48KHz_MASK:
+ freq = 48000;
+ break;
+ }
+ }
+ if (val & VX_SUER_DATA_PRESENT_MASK)
+ /* bit 0 corresponds to consumer/professional bit */
+ *mode = vx_read_one_cbit(chip, 0) ?
+ VX_UER_MODE_PROFESSIONAL : VX_UER_MODE_CONSUMER;
+ else
+ *mode = VX_UER_MODE_NOT_PRESENT;
+
+ return freq;
+}
+
+
+/*
+ * compute the sample clock value from frequency
+ *
+ * The formula is as follows:
+ *
+ * HexFreq = (dword) ((double) ((double) 28224000 / (double) Frequency))
+ * switch ( HexFreq & 0x00000F00 )
+ * case 0x00000100: ;
+ * case 0x00000200:
+ * case 0x00000300: HexFreq -= 0x00000201 ;
+ * case 0x00000400:
+ * case 0x00000500:
+ * case 0x00000600:
+ * case 0x00000700: HexFreq = (dword) (((double) 28224000 / (double) (Frequency*2)) - 1)
+ * default : HexFreq = (dword) ((double) 28224000 / (double) (Frequency*4)) - 0x000001FF
+ */
+
+static int vx_calc_clock_from_freq(struct vx_core *chip, int freq)
+{
+ int hexfreq;
+
+ if (snd_BUG_ON(freq <= 0))
+ return 0;
+
+ hexfreq = (28224000 * 10) / freq;
+ hexfreq = (hexfreq + 5) / 10;
+
+ /* max freq = 55125 Hz */
+ if (snd_BUG_ON(hexfreq <= 0x00000200))
+ return 0;
+
+ if (hexfreq <= 0x03ff)
+ return hexfreq - 0x00000201;
+ if (hexfreq <= 0x07ff)
+ return (hexfreq / 2) - 1;
+ if (hexfreq <= 0x0fff)
+ return (hexfreq / 4) + 0x000001ff;
+
+ return 0x5fe; /* min freq = 6893 Hz */
+}
+
+
+/*
+ * vx_change_clock_source - change the clock source
+ * @source: the new source
+ */
+static void vx_change_clock_source(struct vx_core *chip, int source)
+{
+ /* we mute DAC to prevent clicks */
+ vx_toggle_dac_mute(chip, 1);
+ mutex_lock(&chip->lock);
+ chip->ops->set_clock_source(chip, source);
+ chip->clock_source = source;
+ mutex_unlock(&chip->lock);
+ /* unmute */
+ vx_toggle_dac_mute(chip, 0);
+}
+
+
+/*
+ * set the internal clock
+ */
+void vx_set_internal_clock(struct vx_core *chip, unsigned int freq)
+{
+ int clock;
+
+ /* Get real clock value */
+ clock = vx_calc_clock_from_freq(chip, freq);
+ snd_printdd(KERN_DEBUG "set internal clock to 0x%x from freq %d\n", clock, freq);
+ mutex_lock(&chip->lock);
+ if (vx_is_pcmcia(chip)) {
+ vx_outb(chip, HIFREQ, (clock >> 8) & 0x0f);
+ vx_outb(chip, LOFREQ, clock & 0xff);
+ } else {
+ vx_outl(chip, HIFREQ, (clock >> 8) & 0x0f);
+ vx_outl(chip, LOFREQ, clock & 0xff);
+ }
+ mutex_unlock(&chip->lock);
+}
+
+
+/*
+ * set the iec958 status bits
+ * @bits: 32-bit status bits
+ */
+void vx_set_iec958_status(struct vx_core *chip, unsigned int bits)
+{
+ int i;
+
+ if (chip->chip_status & VX_STAT_IS_STALE)
+ return;
+
+ for (i = 0; i < 32; i++)
+ vx_write_one_cbit(chip, i, bits & (1 << i));
+}
+
+
+/*
+ * vx_set_clock - change the clock and audio source if necessary
+ */
+int vx_set_clock(struct vx_core *chip, unsigned int freq)
+{
+ int src_changed = 0;
+
+ if (chip->chip_status & VX_STAT_IS_STALE)
+ return 0;
+
+ /* change the audio source if possible */
+ vx_sync_audio_source(chip);
+
+ if (chip->clock_mode == VX_CLOCK_MODE_EXTERNAL ||
+ (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
+ chip->audio_source == VX_AUDIO_SRC_DIGITAL)) {
+ if (chip->clock_source != UER_SYNC) {
+ vx_change_clock_source(chip, UER_SYNC);
+ mdelay(6);
+ src_changed = 1;
+ }
+ } else if (chip->clock_mode == VX_CLOCK_MODE_INTERNAL ||
+ (chip->clock_mode == VX_CLOCK_MODE_AUTO &&
+ chip->audio_source != VX_AUDIO_SRC_DIGITAL)) {
+ if (chip->clock_source != INTERNAL_QUARTZ) {
+ vx_change_clock_source(chip, INTERNAL_QUARTZ);
+ src_changed = 1;
+ }
+ if (chip->freq == freq)
+ return 0;
+ vx_set_internal_clock(chip, freq);
+ if (src_changed)
+ vx_modify_board_inputs(chip);
+ }
+ if (chip->freq == freq)
+ return 0;
+ chip->freq = freq;
+ vx_modify_board_clock(chip, 1);
+ return 0;
+}
+
+
+/*
+ * vx_change_frequency - called from interrupt handler
+ */
+int vx_change_frequency(struct vx_core *chip)
+{
+ int freq;
+
+ if (chip->chip_status & VX_STAT_IS_STALE)
+ return 0;
+
+ if (chip->clock_source == INTERNAL_QUARTZ)
+ return 0;
+ /*
+ * Read the real UER board frequency
+ */
+ freq = vx_read_uer_status(chip, &chip->uer_detected);
+ if (freq < 0)
+ return freq;
+ /*
+ * The frequency computed by the DSP is good and
+ * is different from the previous computed.
+ */
+ if (freq == 48000 || freq == 44100 || freq == 32000)
+ chip->freq_detected = freq;
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff