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lx6464es.c

/* -*- linux-c -*- *
 *
 * ALSA driver for the digigram lx6464es interface
 *
 * Copyright (c) 2008, 2009 Tim Blechmann <tim@klingt.org>
 *
 *
 * 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>

#include <sound/initval.h>
#include <sound/control.h>
#include <sound/info.h>

#include "lx6464es.h"

MODULE_AUTHOR("Tim Blechmann");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("digigram lx6464es");
MODULE_SUPPORTED_DEVICE("{digigram lx6464es{}}");


static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for Digigram LX6464ES interface.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for  Digigram LX6464ES interface.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable/disable specific Digigram LX6464ES soundcards.");

static const char card_name[] = "LX6464ES";


#define PCI_DEVICE_ID_PLX_LX6464ES        PCI_DEVICE_ID_PLX_9056

static struct pci_device_id snd_lx6464es_ids[] = {
      { PCI_DEVICE(PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_LX6464ES),
        .subvendor = PCI_VENDOR_ID_DIGIGRAM,
        .subdevice = PCI_SUBDEVICE_ID_DIGIGRAM_LX6464ES_SERIAL_SUBSYSTEM
      },                /* LX6464ES */
      { PCI_DEVICE(PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_LX6464ES),
        .subvendor = PCI_VENDOR_ID_DIGIGRAM,
        .subdevice = PCI_SUBDEVICE_ID_DIGIGRAM_LX6464ES_CAE_SERIAL_SUBSYSTEM
      },                /* LX6464ES-CAE */
      { 0, },
};

MODULE_DEVICE_TABLE(pci, snd_lx6464es_ids);



/* PGO pour USERo dans le registre pci_0x06/loc_0xEC */
#define CHIPSC_RESET_XILINX (1L<<16)


/* alsa callbacks */
static struct snd_pcm_hardware lx_caps = {
      .info             = (SNDRV_PCM_INFO_MMAP |
                       SNDRV_PCM_INFO_INTERLEAVED |
                       SNDRV_PCM_INFO_MMAP_VALID |
                       SNDRV_PCM_INFO_SYNC_START),
      .formats      = (SNDRV_PCM_FMTBIT_S16_LE |
                       SNDRV_PCM_FMTBIT_S16_BE |
                       SNDRV_PCM_FMTBIT_S24_3LE |
                       SNDRV_PCM_FMTBIT_S24_3BE),
      .rates            = (SNDRV_PCM_RATE_CONTINUOUS |
                       SNDRV_PCM_RATE_8000_192000),
      .rate_min         = 8000,
      .rate_max         = 192000,
      .channels_min     = 2,
      .channels_max     = 64,
      .buffer_bytes_max = 64*2*3*MICROBLAZE_IBL_MAX*MAX_STREAM_BUFFER,
      .period_bytes_min = (2*2*MICROBLAZE_IBL_MIN*2),
      .period_bytes_max = (4*64*MICROBLAZE_IBL_MAX*MAX_STREAM_BUFFER),
      .periods_min      = 2,
      .periods_max      = MAX_STREAM_BUFFER,
};

static int lx_set_granularity(struct lx6464es *chip, u32 gran);


static int lx_hardware_open(struct lx6464es *chip,
                      struct snd_pcm_substream *substream)
{
      int err = 0;
      struct snd_pcm_runtime *runtime = substream->runtime;
      int channels = runtime->channels;
      int is_capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);

      snd_pcm_uframes_t period_size = runtime->period_size;

      snd_printd(LXP "allocating pipe for %d channels\n", channels);
      err = lx_pipe_allocate(chip, 0, is_capture, channels);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "allocating pipe failed\n");
            return err;
      }

      err = lx_set_granularity(chip, period_size);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "setting granularity to %ld failed\n",
                     period_size);
            return err;
      }

      return 0;
}

static int lx_hardware_start(struct lx6464es *chip,
                       struct snd_pcm_substream *substream)
{
      int err = 0;
      struct snd_pcm_runtime *runtime = substream->runtime;
      int is_capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);

      snd_printd(LXP "setting stream format\n");
      err = lx_stream_set_format(chip, runtime, 0, is_capture);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "setting stream format failed\n");
            return err;
      }

      snd_printd(LXP "starting pipe\n");
      err = lx_pipe_start(chip, 0, is_capture);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "starting pipe failed\n");
            return err;
      }

      snd_printd(LXP "waiting for pipe to start\n");
      err = lx_pipe_wait_for_start(chip, 0, is_capture);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "waiting for pipe failed\n");
            return err;
      }

      return err;
}


static int lx_hardware_stop(struct lx6464es *chip,
                      struct snd_pcm_substream *substream)
{
      int err = 0;
      int is_capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);

      snd_printd(LXP "pausing pipe\n");
      err = lx_pipe_pause(chip, 0, is_capture);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "pausing pipe failed\n");
            return err;
      }

      snd_printd(LXP "waiting for pipe to become idle\n");
      err = lx_pipe_wait_for_idle(chip, 0, is_capture);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "waiting for pipe failed\n");
            return err;
      }

      snd_printd(LXP "stopping pipe\n");
      err = lx_pipe_stop(chip, 0, is_capture);
      if (err < 0) {
            snd_printk(LXP "stopping pipe failed\n");
            return err;
      }

      return err;
}


static int lx_hardware_close(struct lx6464es *chip,
                       struct snd_pcm_substream *substream)
{
      int err = 0;
      int is_capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);

      snd_printd(LXP "releasing pipe\n");
      err = lx_pipe_release(chip, 0, is_capture);
      if (err < 0) {
            snd_printk(LXP "releasing pipe failed\n");
            return err;
      }

      return err;
}


static int lx_pcm_open(struct snd_pcm_substream *substream)
{
      struct lx6464es *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      int err = 0;
      int board_rate;

      snd_printdd("->lx_pcm_open\n");
      mutex_lock(&chip->setup_mutex);

      /* copy the struct snd_pcm_hardware struct */
      runtime->hw = lx_caps;

#if 0
      /* buffer-size should better be multiple of period-size */
      err = snd_pcm_hw_constraint_integer(runtime,
                                  SNDRV_PCM_HW_PARAM_PERIODS);
      if (err < 0) {
            snd_printk(KERN_WARNING LXP "could not constrain periods\n");
            goto exit;
      }
#endif

      /* the clock rate cannot be changed */
      board_rate = chip->board_sample_rate;
      err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
                                 board_rate, board_rate);

      if (err < 0) {
            snd_printk(KERN_WARNING LXP "could not constrain periods\n");
            goto exit;
      }

      /* constrain period size */
      err = snd_pcm_hw_constraint_minmax(runtime,
                                 SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
                                 MICROBLAZE_IBL_MIN,
                                 MICROBLAZE_IBL_MAX);
      if (err < 0) {
            snd_printk(KERN_WARNING LXP
                     "could not constrain period size\n");
            goto exit;
      }

      snd_pcm_hw_constraint_step(runtime, 0,
                           SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32);

      snd_pcm_set_sync(substream);
      err = 0;

exit:
      runtime->private_data = chip;

      mutex_unlock(&chip->setup_mutex);
      snd_printdd("<-lx_pcm_open, %d\n", err);
      return err;
}

static int lx_pcm_close(struct snd_pcm_substream *substream)
{
      int err = 0;
      snd_printdd("->lx_pcm_close\n");
      return err;
}

static snd_pcm_uframes_t lx_pcm_stream_pointer(struct snd_pcm_substream
                                     *substream)
{
      struct lx6464es *chip = snd_pcm_substream_chip(substream);
      snd_pcm_uframes_t pos;
      unsigned long flags;
      int is_capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);

      struct lx_stream *lx_stream = is_capture ? &chip->capture_stream :
            &chip->playback_stream;

      snd_printdd("->lx_pcm_stream_pointer\n");

      spin_lock_irqsave(&chip->lock, flags);
      pos = lx_stream->frame_pos * substream->runtime->period_size;
      spin_unlock_irqrestore(&chip->lock, flags);

      snd_printdd(LXP "stream_pointer at %ld\n", pos);
      return pos;
}

static int lx_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct lx6464es *chip = snd_pcm_substream_chip(substream);
      int err = 0;
      const int is_capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);

      snd_printdd("->lx_pcm_prepare\n");

      mutex_lock(&chip->setup_mutex);

      if (chip->hardware_running[is_capture]) {
            err = lx_hardware_stop(chip, substream);
            if (err < 0) {
                  snd_printk(KERN_ERR LXP "failed to stop hardware. "
                           "Error code %d\n", err);
                  goto exit;
            }

            err = lx_hardware_close(chip, substream);
            if (err < 0) {
                  snd_printk(KERN_ERR LXP "failed to close hardware. "
                           "Error code %d\n", err);
                  goto exit;
            }
      }

      snd_printd(LXP "opening hardware\n");
      err = lx_hardware_open(chip, substream);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "failed to open hardware. "
                     "Error code %d\n", err);
            goto exit;
      }

      err = lx_hardware_start(chip, substream);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "failed to start hardware. "
                     "Error code %d\n", err);
            goto exit;
      }

      chip->hardware_running[is_capture] = 1;

      if (chip->board_sample_rate != substream->runtime->rate) {
            if (!err)
                  chip->board_sample_rate = substream->runtime->rate;
      }

exit:
      mutex_unlock(&chip->setup_mutex);
      return err;
}

static int lx_pcm_hw_params(struct snd_pcm_substream *substream,
                      struct snd_pcm_hw_params *hw_params, int is_capture)
{
      struct lx6464es *chip = snd_pcm_substream_chip(substream);
      int err = 0;

      snd_printdd("->lx_pcm_hw_params\n");

      mutex_lock(&chip->setup_mutex);

      /* set dma buffer */
      err = snd_pcm_lib_malloc_pages(substream,
                               params_buffer_bytes(hw_params));

      if (is_capture)
            chip->capture_stream.stream = substream;
      else
            chip->playback_stream.stream = substream;

      mutex_unlock(&chip->setup_mutex);
      return err;
}

static int lx_pcm_hw_params_playback(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *hw_params)
{
      return lx_pcm_hw_params(substream, hw_params, 0);
}

static int lx_pcm_hw_params_capture(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *hw_params)
{
      return lx_pcm_hw_params(substream, hw_params, 1);
}

static int lx_pcm_hw_free(struct snd_pcm_substream *substream)
{
      struct lx6464es *chip = snd_pcm_substream_chip(substream);
      int err = 0;
      int is_capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);

      snd_printdd("->lx_pcm_hw_free\n");
      mutex_lock(&chip->setup_mutex);

      if (chip->hardware_running[is_capture]) {
            err = lx_hardware_stop(chip, substream);
            if (err < 0) {
                  snd_printk(KERN_ERR LXP "failed to stop hardware. "
                           "Error code %d\n", err);
                  goto exit;
            }

            err = lx_hardware_close(chip, substream);
            if (err < 0) {
                  snd_printk(KERN_ERR LXP "failed to close hardware. "
                           "Error code %d\n", err);
                  goto exit;
            }

            chip->hardware_running[is_capture] = 0;
      }

      err = snd_pcm_lib_free_pages(substream);

      if (is_capture)
            chip->capture_stream.stream = 0;
      else
            chip->playback_stream.stream = 0;

exit:
      mutex_unlock(&chip->setup_mutex);
      return err;
}

static void lx_trigger_start(struct lx6464es *chip, struct lx_stream *lx_stream)
{
      struct snd_pcm_substream *substream = lx_stream->stream;
      const int is_capture = lx_stream->is_capture;

      int err;

      const u32 channels = substream->runtime->channels;
      const u32 bytes_per_frame = channels * 3;
      const u32 period_size = substream->runtime->period_size;
      const u32 periods = substream->runtime->periods;
      const u32 period_bytes = period_size * bytes_per_frame;

      dma_addr_t buf = substream->dma_buffer.addr;
      int i;

      u32 needed, freed;
      u32 size_array[5];

      for (i = 0; i != periods; ++i) {
            u32 buffer_index = 0;

            err = lx_buffer_ask(chip, 0, is_capture, &needed, &freed,
                            size_array);
            snd_printdd(LXP "starting: needed %d, freed %d\n",
                      needed, freed);

            err = lx_buffer_give(chip, 0, is_capture, period_bytes,
                             lower_32_bits(buf), upper_32_bits(buf),
                             &buffer_index);

            snd_printdd(LXP "starting: buffer index %x on %p (%d bytes)\n",
                      buffer_index, (void *)buf, period_bytes);
            buf += period_bytes;
      }

      err = lx_buffer_ask(chip, 0, is_capture, &needed, &freed, size_array);
      snd_printdd(LXP "starting: needed %d, freed %d\n", needed, freed);

      snd_printd(LXP "starting: starting stream\n");
      err = lx_stream_start(chip, 0, is_capture);
      if (err < 0)
            snd_printk(KERN_ERR LXP "couldn't start stream\n");
      else
            lx_stream->status = LX_STREAM_STATUS_RUNNING;

      lx_stream->frame_pos = 0;
}

static void lx_trigger_stop(struct lx6464es *chip, struct lx_stream *lx_stream)
{
      const int is_capture = lx_stream->is_capture;
      int err;

      snd_printd(LXP "stopping: stopping stream\n");
      err = lx_stream_stop(chip, 0, is_capture);
      if (err < 0)
            snd_printk(KERN_ERR LXP "couldn't stop stream\n");
      else
            lx_stream->status = LX_STREAM_STATUS_FREE;

}

static void lx_trigger_tasklet_dispatch_stream(struct lx6464es *chip,
                                     struct lx_stream *lx_stream)
{
      switch (lx_stream->status) {
      case LX_STREAM_STATUS_SCHEDULE_RUN:
            lx_trigger_start(chip, lx_stream);
            break;

      case LX_STREAM_STATUS_SCHEDULE_STOP:
            lx_trigger_stop(chip, lx_stream);
            break;

      default:
            break;
      }
}

static void lx_trigger_tasklet(unsigned long data)
{
      struct lx6464es *chip = (struct lx6464es *)data;
      unsigned long flags;

      snd_printdd("->lx_trigger_tasklet\n");

      spin_lock_irqsave(&chip->lock, flags);
      lx_trigger_tasklet_dispatch_stream(chip, &chip->capture_stream);
      lx_trigger_tasklet_dispatch_stream(chip, &chip->playback_stream);
      spin_unlock_irqrestore(&chip->lock, flags);
}

static int lx_pcm_trigger_dispatch(struct lx6464es *chip,
                           struct lx_stream *lx_stream, int cmd)
{
      int err = 0;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            lx_stream->status = LX_STREAM_STATUS_SCHEDULE_RUN;
            break;

      case SNDRV_PCM_TRIGGER_STOP:
            lx_stream->status = LX_STREAM_STATUS_SCHEDULE_STOP;
            break;

      default:
            err = -EINVAL;
            goto exit;
      }
      tasklet_schedule(&chip->trigger_tasklet);

exit:
      return err;
}


static int lx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct lx6464es *chip = snd_pcm_substream_chip(substream);
      const int is_capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
      struct lx_stream *stream = is_capture ? &chip->capture_stream :
            &chip->playback_stream;

      snd_printdd("->lx_pcm_trigger\n");

      return lx_pcm_trigger_dispatch(chip, stream, cmd);
}

static int snd_lx6464es_free(struct lx6464es *chip)
{
      snd_printdd("->snd_lx6464es_free\n");

      lx_irq_disable(chip);

      if (chip->irq >= 0)
            free_irq(chip->irq, chip);

      iounmap(chip->port_dsp_bar);
      ioport_unmap(chip->port_plx_remapped);

      pci_release_regions(chip->pci);
      pci_disable_device(chip->pci);

      kfree(chip);

      return 0;
}

static int snd_lx6464es_dev_free(struct snd_device *device)
{
      return snd_lx6464es_free(device->device_data);
}

/* reset the dsp during initialization */
static int __devinit lx_init_xilinx_reset(struct lx6464es *chip)
{
      int i;
      u32 plx_reg = lx_plx_reg_read(chip, ePLX_CHIPSC);

      snd_printdd("->lx_init_xilinx_reset\n");

      /* activate reset of xilinx */
      plx_reg &= ~CHIPSC_RESET_XILINX;

      lx_plx_reg_write(chip, ePLX_CHIPSC, plx_reg);
      msleep(1);

      lx_plx_reg_write(chip, ePLX_MBOX3, 0);
      msleep(1);

      plx_reg |= CHIPSC_RESET_XILINX;
      lx_plx_reg_write(chip, ePLX_CHIPSC, plx_reg);

      /* deactivate reset of xilinx */
      for (i = 0; i != 100; ++i) {
            u32 reg_mbox3;
            msleep(10);
            reg_mbox3 = lx_plx_reg_read(chip, ePLX_MBOX3);
            if (reg_mbox3) {
                  snd_printd(LXP "xilinx reset done\n");
                  snd_printdd(LXP "xilinx took %d loops\n", i);
                  break;
            }
      }

      /* todo: add some error handling? */

      /* clear mr */
      lx_dsp_reg_write(chip, eReg_CSM, 0);

      /* le xilinx ES peut ne pas etre encore pret, on attend. */
      msleep(600);

      return 0;
}

static int __devinit lx_init_xilinx_test(struct lx6464es *chip)
{
      u32 reg;

      snd_printdd("->lx_init_xilinx_test\n");

      /* TEST if we have access to Xilinx/MicroBlaze */
      lx_dsp_reg_write(chip, eReg_CSM, 0);

      reg = lx_dsp_reg_read(chip, eReg_CSM);

      if (reg) {
            snd_printk(KERN_ERR LXP "Problem: Reg_CSM %x.\n", reg);

            /* PCI9056_SPACE0_REMAP */
            lx_plx_reg_write(chip, ePLX_PCICR, 1);

            reg = lx_dsp_reg_read(chip, eReg_CSM);
            if (reg) {
                  snd_printk(KERN_ERR LXP "Error: Reg_CSM %x.\n", reg);
                  return -EAGAIN; /* seems to be appropriate */
            }
      }

      snd_printd(LXP "Xilinx/MicroBlaze access test successful\n");

      return 0;
}

/* initialize ethersound */
static int __devinit lx_init_ethersound_config(struct lx6464es *chip)
{
      int i;
      u32 orig_conf_es = lx_dsp_reg_read(chip, eReg_CONFES);

      /* configure 64 io channels */
      u32 conf_es = (orig_conf_es & CONFES_READ_PART_MASK) |
            (64 << IOCR_INPUTS_OFFSET) |
            (64 << IOCR_OUTPUTS_OFFSET) |
            (FREQ_RATIO_SINGLE_MODE << FREQ_RATIO_OFFSET);

      snd_printdd("->lx_init_ethersound\n");

      chip->freq_ratio = FREQ_RATIO_SINGLE_MODE;

      /*
       * write it to the card !
       * this actually kicks the ES xilinx, the first time since poweron.
       * the MAC address in the Reg_ADMACESMSB Reg_ADMACESLSB registers
       * is not ready before this is done, and the bit 2 in Reg_CSES is set.
       * */
      lx_dsp_reg_write(chip, eReg_CONFES, conf_es);

      for (i = 0; i != 1000; ++i) {
            if (lx_dsp_reg_read(chip, eReg_CSES) & 4) {
                  snd_printd(LXP "ethersound initialized after %dms\n",
                           i);
                  goto ethersound_initialized;
            }
            msleep(1);
      }
      snd_printk(KERN_WARNING LXP
               "ethersound could not be initialized after %dms\n", i);
      return -ETIMEDOUT;

 ethersound_initialized:
      snd_printd(LXP "ethersound initialized\n");
      return 0;
}

static int __devinit lx_init_get_version_features(struct lx6464es *chip)
{
      u32 dsp_version;

      int err;

      snd_printdd("->lx_init_get_version_features\n");

      err = lx_dsp_get_version(chip, &dsp_version);

      if (err == 0) {
            u32 freq;

            snd_printk(LXP "DSP version: V%02d.%02d #%d\n",
                     (dsp_version>>16) & 0xff, (dsp_version>>8) & 0xff,
                     dsp_version & 0xff);

            /* later: what firmware version do we expect? */

            /* retrieve Play/Rec features */
            /* done here because we may have to handle alternate
             * DSP files. */
            /* later */

            /* init the EtherSound sample rate */
            err = lx_dsp_get_clock_frequency(chip, &freq);
            if (err == 0)
                  chip->board_sample_rate = freq;
            snd_printd(LXP "actual clock frequency %d\n", freq);
      } else {
            snd_printk(KERN_ERR LXP "DSP corrupted \n");
            err = -EAGAIN;
      }

      return err;
}

static int lx_set_granularity(struct lx6464es *chip, u32 gran)
{
      int err = 0;
      u32 snapped_gran = MICROBLAZE_IBL_MIN;

      snd_printdd("->lx_set_granularity\n");

      /* blocksize is a power of 2 */
      while ((snapped_gran < gran) &&
             (snapped_gran < MICROBLAZE_IBL_MAX)) {
            snapped_gran *= 2;
      }

      if (snapped_gran == chip->pcm_granularity)
            return 0;

      err = lx_dsp_set_granularity(chip, snapped_gran);
      if (err < 0) {
            snd_printk(KERN_WARNING LXP "could not set granularity\n");
            err = -EAGAIN;
      }

      if (snapped_gran != gran)
            snd_printk(LXP "snapped blocksize to %d\n", snapped_gran);

      snd_printd(LXP "set blocksize on board %d\n", snapped_gran);
      chip->pcm_granularity = snapped_gran;

      return err;
}

/* initialize and test the xilinx dsp chip */
static int __devinit lx_init_dsp(struct lx6464es *chip)
{
      int err;
      u8 mac_address[6];
      int i;

      snd_printdd("->lx_init_dsp\n");

      snd_printd(LXP "initialize board\n");
      err = lx_init_xilinx_reset(chip);
      if (err)
            return err;

      snd_printd(LXP "testing board\n");
      err = lx_init_xilinx_test(chip);
      if (err)
            return err;

      snd_printd(LXP "initialize ethersound configuration\n");
      err = lx_init_ethersound_config(chip);
      if (err)
            return err;

      lx_irq_enable(chip);

      /** \todo the mac address should be ready by not, but it isn't,
       *  so we wait for it */
      for (i = 0; i != 1000; ++i) {
            err = lx_dsp_get_mac(chip, mac_address);
            if (err)
                  return err;
            if (mac_address[0] || mac_address[1] || mac_address[2] ||
                mac_address[3] || mac_address[4] || mac_address[5])
                  goto mac_ready;
            msleep(1);
      }
      return -ETIMEDOUT;

mac_ready:
      snd_printd(LXP "mac address ready read after: %dms\n", i);
      snd_printk(LXP "mac address: %02X.%02X.%02X.%02X.%02X.%02X\n",
               mac_address[0], mac_address[1], mac_address[2],
               mac_address[3], mac_address[4], mac_address[5]);

      err = lx_init_get_version_features(chip);
      if (err)
            return err;

      lx_set_granularity(chip, MICROBLAZE_IBL_DEFAULT);

      chip->playback_mute = 0;

      return err;
}

static struct snd_pcm_ops lx_ops_playback = {
      .open      = lx_pcm_open,
      .close     = lx_pcm_close,
      .ioctl     = snd_pcm_lib_ioctl,
      .prepare   = lx_pcm_prepare,
      .hw_params = lx_pcm_hw_params_playback,
      .hw_free   = lx_pcm_hw_free,
      .trigger   = lx_pcm_trigger,
      .pointer   = lx_pcm_stream_pointer,
};

static struct snd_pcm_ops lx_ops_capture = {
      .open      = lx_pcm_open,
      .close     = lx_pcm_close,
      .ioctl     = snd_pcm_lib_ioctl,
      .prepare   = lx_pcm_prepare,
      .hw_params = lx_pcm_hw_params_capture,
      .hw_free   = lx_pcm_hw_free,
      .trigger   = lx_pcm_trigger,
      .pointer   = lx_pcm_stream_pointer,
};

static int __devinit lx_pcm_create(struct lx6464es *chip)
{
      int err;
      struct snd_pcm *pcm;

      u32 size = 64 *              /* channels */
            3 *              /* 24 bit samples */
            MAX_STREAM_BUFFER *  /* periods */
            MICROBLAZE_IBL_MAX * /* frames per period */
            2;               /* duplex */

      size = PAGE_ALIGN(size);

      /* hardcoded device name & channel count */
      err = snd_pcm_new(chip->card, (char *)card_name, 0,
                    1, 1, &pcm);

      pcm->private_data = chip;

      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &lx_ops_playback);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &lx_ops_capture);

      pcm->info_flags = 0;
      strcpy(pcm->name, card_name);

      err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                        snd_dma_pci_data(chip->pci),
                                        size, size);
      if (err < 0)
            return err;

      chip->pcm = pcm;
      chip->capture_stream.is_capture = 1;

      return 0;
}

static int lx_control_playback_info(struct snd_kcontrol *kcontrol,
                            struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 1;
      return 0;
}

static int lx_control_playback_get(struct snd_kcontrol *kcontrol,
                           struct snd_ctl_elem_value *ucontrol)
{
      struct lx6464es *chip = snd_kcontrol_chip(kcontrol);
      ucontrol->value.integer.value[0] = chip->playback_mute;
      return 0;
}

static int lx_control_playback_put(struct snd_kcontrol *kcontrol,
                           struct snd_ctl_elem_value *ucontrol)
{
      struct lx6464es *chip = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      int current_value = chip->playback_mute;

      if (current_value != ucontrol->value.integer.value[0]) {
            lx_level_unmute(chip, 0, !current_value);
            chip->playback_mute = !current_value;
            changed = 1;
      }
      return changed;
}

static struct snd_kcontrol_new lx_control_playback_switch __devinitdata = {
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "PCM Playback Switch",
      .index = 0,
      .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
      .private_value = 0,
      .info = lx_control_playback_info,
      .get = lx_control_playback_get,
      .put = lx_control_playback_put
};



static void lx_proc_levels_read(struct snd_info_entry *entry,
                        struct snd_info_buffer *buffer)
{
      u32 levels[64];
      int err;
      int i, j;
      struct lx6464es *chip = entry->private_data;

      snd_iprintf(buffer, "capture levels:\n");
      err = lx_level_peaks(chip, 1, 64, levels);
      if (err < 0)
            return;

      for (i = 0; i != 8; ++i) {
            for (j = 0; j != 8; ++j)
                  snd_iprintf(buffer, "%08x ", levels[i*8+j]);
            snd_iprintf(buffer, "\n");
      }

      snd_iprintf(buffer, "\nplayback levels:\n");

      err = lx_level_peaks(chip, 0, 64, levels);
      if (err < 0)
            return;

      for (i = 0; i != 8; ++i) {
            for (j = 0; j != 8; ++j)
                  snd_iprintf(buffer, "%08x ", levels[i*8+j]);
            snd_iprintf(buffer, "\n");
      }

      snd_iprintf(buffer, "\n");
}

static int __devinit lx_proc_create(struct snd_card *card, struct lx6464es *chip)
{
      struct snd_info_entry *entry;
      int err = snd_card_proc_new(card, "levels", &entry);
      if (err < 0)
            return err;

      snd_info_set_text_ops(entry, chip, lx_proc_levels_read);
      return 0;
}


static int __devinit snd_lx6464es_create(struct snd_card *card,
                               struct pci_dev *pci,
                               struct lx6464es **rchip)
{
      struct lx6464es *chip;
      int err;

      static struct snd_device_ops ops = {
            .dev_free = snd_lx6464es_dev_free,
      };

      snd_printdd("->snd_lx6464es_create\n");

      *rchip = NULL;

      /* enable PCI device */
      err = pci_enable_device(pci);
      if (err < 0)
            return err;

      pci_set_master(pci);

      /* check if we can restrict PCI DMA transfers to 32 bits */
      err = pci_set_dma_mask(pci, DMA_BIT_MASK(32));
      if (err < 0) {
            snd_printk(KERN_ERR "architecture does not support "
                     "32bit PCI busmaster DMA\n");
            pci_disable_device(pci);
            return -ENXIO;
      }

      chip = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (chip == NULL) {
            err = -ENOMEM;
            goto alloc_failed;
      }

      chip->card = card;
      chip->pci = pci;
      chip->irq = -1;

      /* initialize synchronization structs */
      spin_lock_init(&chip->lock);
      spin_lock_init(&chip->msg_lock);
      mutex_init(&chip->setup_mutex);
      tasklet_init(&chip->trigger_tasklet, lx_trigger_tasklet,
                 (unsigned long)chip);
      tasklet_init(&chip->tasklet_capture, lx_tasklet_capture,
                 (unsigned long)chip);
      tasklet_init(&chip->tasklet_playback, lx_tasklet_playback,
                 (unsigned long)chip);

      /* request resources */
      err = pci_request_regions(pci, card_name);
      if (err < 0)
            goto request_regions_failed;

      /* plx port */
      chip->port_plx = pci_resource_start(pci, 1);
      chip->port_plx_remapped = ioport_map(chip->port_plx,
                                   pci_resource_len(pci, 1));

      /* dsp port */
      chip->port_dsp_bar = pci_ioremap_bar(pci, 2);

      err = request_irq(pci->irq, lx_interrupt, IRQF_SHARED,
                    card_name, chip);
      if (err) {
            snd_printk(KERN_ERR LXP "unable to grab IRQ %d\n", pci->irq);
            goto request_irq_failed;
      }
      chip->irq = pci->irq;

      err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
      if (err < 0)
            goto device_new_failed;

      err = lx_init_dsp(chip);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "error during DSP initialization\n");
            return err;
      }

      err = lx_pcm_create(chip);
      if (err < 0)
            return err;

      err = lx_proc_create(card, chip);
      if (err < 0)
            return err;

      err = snd_ctl_add(card, snd_ctl_new1(&lx_control_playback_switch,
                                   chip));
      if (err < 0)
            return err;

      snd_card_set_dev(card, &pci->dev);

      *rchip = chip;
      return 0;

device_new_failed:
      free_irq(pci->irq, chip);

request_irq_failed:
      pci_release_regions(pci);

request_regions_failed:
      kfree(chip);

alloc_failed:
      pci_disable_device(pci);

      return err;
}

static int __devinit snd_lx6464es_probe(struct pci_dev *pci,
                              const struct pci_device_id *pci_id)
{
      static int dev;
      struct snd_card *card;
      struct lx6464es *chip;
      int err;

      snd_printdd("->snd_lx6464es_probe\n");

      if (dev >= SNDRV_CARDS)
            return -ENODEV;
      if (!enable[dev]) {
            dev++;
            return -ENOENT;
      }

      err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
      if (err < 0)
            return err;

      err = snd_lx6464es_create(card, pci, &chip);
      if (err < 0) {
            snd_printk(KERN_ERR LXP "error during snd_lx6464es_create\n");
            goto out_free;
      }

      strcpy(card->driver, "lx6464es");
      strcpy(card->shortname, "Digigram LX6464ES");
      sprintf(card->longname, "%s at 0x%lx, 0x%p, irq %i",
            card->shortname, chip->port_plx,
            chip->port_dsp_bar, chip->irq);

      err = snd_card_register(card);
      if (err < 0)
            goto out_free;

      snd_printdd(LXP "initialization successful\n");
      pci_set_drvdata(pci, card);
      dev++;
      return 0;

out_free:
      snd_card_free(card);
      return err;

}

static void __devexit snd_lx6464es_remove(struct pci_dev *pci)
{
      snd_card_free(pci_get_drvdata(pci));
      pci_set_drvdata(pci, NULL);
}


static struct pci_driver driver = {
      .name =     "Digigram LX6464ES",
      .id_table = snd_lx6464es_ids,
      .probe =    snd_lx6464es_probe,
      .remove = __devexit_p(snd_lx6464es_remove),
};


/* module initialization */
static int __init mod_init(void)
{
      return pci_register_driver(&driver);
}

static void __exit mod_exit(void)
{
      pci_unregister_driver(&driver);
}

module_init(mod_init);
module_exit(mod_exit);

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