/*
   * PMac DBDMA lowlevel functions
   *
   * Copyright (c) by Takashi Iwai <tiwai@suse.de>
   * code based on dmasound.c.
   *
   *   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 <asm/io.h>
  #include <asm/irq.h>
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/slab.h>
  #include <linux/interrupt.h>

  #include <linux/pci.h>
  #include <linux/dma-mapping.h>

  #include <sound/core.h>
  #include "pmac.h"
  #include <sound/pcm_params.h>

  #include <asm/pmac_feature.h>

  #include <asm/pci-bridge.h>

  /* fixed frequency table for awacs, screamer, burgundy, DACA (44100 max) */
  static int awacs_freqs[8] = {
  	44100, 29400, 22050, 17640, 14700, 11025, 8820, 7350
  };
  /* fixed frequency table for tumbler */
  static int tumbler_freqs[1] = {
  	44100
  };

  
  /*
   * we will allocate a single 'emergency' dbdma cmd block to use if the
   * tx status comes up "DEAD".  This happens on some PowerComputing Pmac
   * clones, either owing to a bug in dbdma or some interaction between
   * IDE and sound.  However, this measure would deal with DEAD status if
   * it appeared elsewhere.
   */
  static struct pmac_dbdma emergency_dbdma;
  static int emergency_in_use;

  /*
   * allocate DBDMA command arrays
   */

  static int snd_pmac_dbdma_alloc(struct snd_pmac *chip, struct pmac_dbdma *rec, int size)

  {

  	unsigned int rsize = sizeof(struct dbdma_cmd) * (size + 1);
  
  	rec->space = dma_alloc_coherent(&chip->pdev->dev, rsize,
  					&rec->dma_base, GFP_KERNEL);

  	if (rec->space == NULL)
  		return -ENOMEM;
  	rec->size = size;

  	memset(rec->space, 0, rsize);

  	rec->cmds = (void __iomem *)DBDMA_ALIGN(rec->space);

  	rec->addr = rec->dma_base + (unsigned long)((char *)rec->cmds - (char *)rec->space);

  	return 0;
  }

  static void snd_pmac_dbdma_free(struct snd_pmac *chip, struct pmac_dbdma *rec)

  {

  	if (rec->space) {

  		unsigned int rsize = sizeof(struct dbdma_cmd) * (rec->size + 1);
  
  		dma_free_coherent(&chip->pdev->dev, rsize, rec->space, rec->dma_base);
  	}

  }
  
  
  /*
   * pcm stuff
   */
  
  /*
   * look up frequency table
   */

  unsigned int snd_pmac_rate_index(struct snd_pmac *chip, struct pmac_stream *rec, unsigned int rate)

  {
  	int i, ok, found;
  
  	ok = rec->cur_freqs;
  	if (rate > chip->freq_table[0])
  		return 0;
  	found = 0;
  	for (i = 0; i < chip->num_freqs; i++, ok >>= 1) {
  		if (! (ok & 1)) continue;
  		found = i;
  		if (rate >= chip->freq_table[i])
  			break;
  	}
  	return found;
  }
  
  /*
   * check whether another stream is active
   */
  static inline int another_stream(int stream)
  {
  	return (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  		SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
  }
  
  /*
   * allocate buffers
   */

  static int snd_pmac_pcm_hw_params(struct snd_pcm_substream *subs,
  				  struct snd_pcm_hw_params *hw_params)

  {
  	return snd_pcm_lib_malloc_pages(subs, params_buffer_bytes(hw_params));
  }
  
  /*
   * release buffers
   */

  static int snd_pmac_pcm_hw_free(struct snd_pcm_substream *subs)

  {
  	snd_pcm_lib_free_pages(subs);
  	return 0;
  }
  
  /*
   * get a stream of the opposite direction
   */

  static struct pmac_stream *snd_pmac_get_stream(struct snd_pmac *chip, int stream)

  {
  	switch (stream) {
  	case SNDRV_PCM_STREAM_PLAYBACK:
  		return &chip->playback;
  	case SNDRV_PCM_STREAM_CAPTURE:
  		return &chip->capture;
  	default:
  		snd_BUG();
  		return NULL;
  	}
  }
  
  /*
   * wait while run status is on
   */

  static inline void

  snd_pmac_wait_ack(struct pmac_stream *rec)

  {
  	int timeout = 50000;
  	while ((in_le32(&rec->dma->status) & RUN) && timeout-- > 0)
  		udelay(1);
  }
  
  /*
   * set the format and rate to the chip.
   * call the lowlevel function if defined (e.g. for AWACS).
   */

  static void snd_pmac_pcm_set_format(struct snd_pmac *chip)

  {
  	/* set up frequency and format */
  	out_le32(&chip->awacs->control, chip->control_mask | (chip->rate_index << 8));
  	out_le32(&chip->awacs->byteswap, chip->format == SNDRV_PCM_FORMAT_S16_LE ? 1 : 0);
  	if (chip->set_format)
  		chip->set_format(chip);
  }
  
  /*
   * stop the DMA transfer
   */

  static inline void snd_pmac_dma_stop(struct pmac_stream *rec)

  {
  	out_le32(&rec->dma->control, (RUN|WAKE|FLUSH|PAUSE) << 16);
  	snd_pmac_wait_ack(rec);
  }
  
  /*
   * set the command pointer address
   */

  static inline void snd_pmac_dma_set_command(struct pmac_stream *rec, struct pmac_dbdma *cmd)

  {
  	out_le32(&rec->dma->cmdptr, cmd->addr);
  }
  
  /*
   * start the DMA
   */

  static inline void snd_pmac_dma_run(struct pmac_stream *rec, int status)

  {
  	out_le32(&rec->dma->control, status | (status << 16));
  }
  
  
  /*
   * prepare playback/capture stream
   */

  static int snd_pmac_pcm_prepare(struct snd_pmac *chip, struct pmac_stream *rec, struct snd_pcm_substream *subs)

  {
  	int i;
  	volatile struct dbdma_cmd __iomem *cp;

  	struct snd_pcm_runtime *runtime = subs->runtime;

  	int rate_index;
  	long offset;

  	struct pmac_stream *astr;

  	rec->dma_size = snd_pcm_lib_buffer_bytes(subs);
  	rec->period_size = snd_pcm_lib_period_bytes(subs);
  	rec->nperiods = rec->dma_size / rec->period_size;
  	rec->cur_period = 0;
  	rate_index = snd_pmac_rate_index(chip, rec, runtime->rate);
  
  	/* set up constraints */
  	astr = snd_pmac_get_stream(chip, another_stream(rec->stream));

  	if (! astr)
  		return -EINVAL;

  	astr->cur_freqs = 1 << rate_index;
  	astr->cur_formats = 1 << runtime->format;
  	chip->rate_index = rate_index;
  	chip->format = runtime->format;
  
  	/* We really want to execute a DMA stop command, after the AWACS
  	 * is initialized.
  	 * For reasons I don't understand, it stops the hissing noise
  	 * common to many PowerBook G3 systems and random noise otherwise
  	 * captured on iBook2's about every third time. -ReneR
  	 */
  	spin_lock_irq(&chip->reg_lock);
  	snd_pmac_dma_stop(rec);
  	st_le16(&chip->extra_dma.cmds->command, DBDMA_STOP);
  	snd_pmac_dma_set_command(rec, &chip->extra_dma);
  	snd_pmac_dma_run(rec, RUN);
  	spin_unlock_irq(&chip->reg_lock);
  	mdelay(5);
  	spin_lock_irq(&chip->reg_lock);
  	/* continuous DMA memory type doesn't provide the physical address,
  	 * so we need to resolve the address here...
  	 */

  	offset = runtime->dma_addr;

  	for (i = 0, cp = rec->cmd.cmds; i < rec->nperiods; i++, cp++) {
  		st_le32(&cp->phy_addr, offset);
  		st_le16(&cp->req_count, rec->period_size);
  		/*st_le16(&cp->res_count, 0);*/
  		st_le16(&cp->xfer_status, 0);
  		offset += rec->period_size;
  	}
  	/* make loop */
  	st_le16(&cp->command, DBDMA_NOP + BR_ALWAYS);
  	st_le32(&cp->cmd_dep, rec->cmd.addr);
  
  	snd_pmac_dma_stop(rec);
  	snd_pmac_dma_set_command(rec, &rec->cmd);
  	spin_unlock_irq(&chip->reg_lock);
  
  	return 0;
  }
  
  
  /*
   * PCM trigger/stop
   */

  static int snd_pmac_pcm_trigger(struct snd_pmac *chip, struct pmac_stream *rec,
  				struct snd_pcm_substream *subs, int cmd)

  {
  	volatile struct dbdma_cmd __iomem *cp;
  	int i, command;
  
  	switch (cmd) {
  	case SNDRV_PCM_TRIGGER_START:
  	case SNDRV_PCM_TRIGGER_RESUME:
  		if (rec->running)
  			return -EBUSY;
  		command = (subs->stream == SNDRV_PCM_STREAM_PLAYBACK ?
  			   OUTPUT_MORE : INPUT_MORE) + INTR_ALWAYS;
  		spin_lock(&chip->reg_lock);
  		snd_pmac_beep_stop(chip);
  		snd_pmac_pcm_set_format(chip);
  		for (i = 0, cp = rec->cmd.cmds; i < rec->nperiods; i++, cp++)
  			out_le16(&cp->command, command);
  		snd_pmac_dma_set_command(rec, &rec->cmd);
  		(void)in_le32(&rec->dma->status);
  		snd_pmac_dma_run(rec, RUN|WAKE);
  		rec->running = 1;
  		spin_unlock(&chip->reg_lock);
  		break;
  
  	case SNDRV_PCM_TRIGGER_STOP:
  	case SNDRV_PCM_TRIGGER_SUSPEND:
  		spin_lock(&chip->reg_lock);
  		rec->running = 0;

  		/*printk(KERN_DEBUG "stopped!!
  ");*/

  		snd_pmac_dma_stop(rec);
  		for (i = 0, cp = rec->cmd.cmds; i < rec->nperiods; i++, cp++)
  			out_le16(&cp->command, DBDMA_STOP);
  		spin_unlock(&chip->reg_lock);
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  /*
   * return the current pointer
   */
  inline

  static snd_pcm_uframes_t snd_pmac_pcm_pointer(struct snd_pmac *chip,
  					      struct pmac_stream *rec,
  					      struct snd_pcm_substream *subs)

  {
  	int count = 0;
  
  #if 1 /* hmm.. how can we get the current dma pointer?? */
  	int stat;
  	volatile struct dbdma_cmd __iomem *cp = &rec->cmd.cmds[rec->cur_period];
  	stat = ld_le16(&cp->xfer_status);
  	if (stat & (ACTIVE|DEAD)) {
  		count = in_le16(&cp->res_count);
  		if (count)
  			count = rec->period_size - count;
  	}
  #endif
  	count += rec->cur_period * rec->period_size;

  	/*printk(KERN_DEBUG "pointer=%d
  ", count);*/

  	return bytes_to_frames(subs->runtime, count);
  }
  
  /*
   * playback
   */

  static int snd_pmac_playback_prepare(struct snd_pcm_substream *subs)

  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  	return snd_pmac_pcm_prepare(chip, &chip->playback, subs);
  }

  static int snd_pmac_playback_trigger(struct snd_pcm_substream *subs,

  				     int cmd)
  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  	return snd_pmac_pcm_trigger(chip, &chip->playback, subs, cmd);
  }

  static snd_pcm_uframes_t snd_pmac_playback_pointer(struct snd_pcm_substream *subs)

  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  	return snd_pmac_pcm_pointer(chip, &chip->playback, subs);
  }
  
  
  /*
   * capture
   */

  static int snd_pmac_capture_prepare(struct snd_pcm_substream *subs)

  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  	return snd_pmac_pcm_prepare(chip, &chip->capture, subs);
  }

  static int snd_pmac_capture_trigger(struct snd_pcm_substream *subs,

  				    int cmd)
  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  	return snd_pmac_pcm_trigger(chip, &chip->capture, subs, cmd);
  }

  static snd_pcm_uframes_t snd_pmac_capture_pointer(struct snd_pcm_substream *subs)

  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  	return snd_pmac_pcm_pointer(chip, &chip->capture, subs);
  }
  
  
  /*

   * Handle DEAD DMA transfers:
   * if the TX status comes up "DEAD" - reported on some Power Computing machines
   * we need to re-start the dbdma - but from a different physical start address
   * and with a different transfer length.  It would get very messy to do this
   * with the normal dbdma_cmd blocks - we would have to re-write the buffer start
   * addresses each time.  So, we will keep a single dbdma_cmd block which can be
   * fiddled with.
   * When DEAD status is first reported the content of the faulted dbdma block is
   * copied into the emergency buffer and we note that the buffer is in use.
   * we then bump the start physical address by the amount that was successfully
   * output before it died.
   * On any subsequent DEAD result we just do the bump-ups (we know that we are
   * already using the emergency dbdma_cmd).
   * CHECK: this just tries to "do it".  It is possible that we should abandon
   * xfers when the number of residual bytes gets below a certain value - I can
   * see that this might cause a loop-forever if a too small transfer causes
   * DEAD status.  However this is a TODO for now - we'll see what gets reported.
   * When we get a successful transfer result with the emergency buffer we just
   * pretend that it completed using the original dmdma_cmd and carry on.  The
   * 'next_cmd' field will already point back to the original loop of blocks.
   */
  static inline void snd_pmac_pcm_dead_xfer(struct pmac_stream *rec,
  					  volatile struct dbdma_cmd __iomem *cp)
  {
  	unsigned short req, res ;
  	unsigned int phy ;
  
  	/* printk(KERN_WARNING "snd-powermac: DMA died - patching it up!
  "); */
  
  	/* to clear DEAD status we must first clear RUN
  	   set it to quiescent to be on the safe side */
  	(void)in_le32(&rec->dma->status);
  	out_le32(&rec->dma->control, (RUN|PAUSE|FLUSH|WAKE) << 16);
  
  	if (!emergency_in_use) { /* new problem */
  		memcpy((void *)emergency_dbdma.cmds, (void *)cp,
  		       sizeof(struct dbdma_cmd));
  		emergency_in_use = 1;
  		st_le16(&cp->xfer_status, 0);
  		st_le16(&cp->req_count, rec->period_size);
  		cp = emergency_dbdma.cmds;
  	}
  
  	/* now bump the values to reflect the amount
  	   we haven't yet shifted */
  	req = ld_le16(&cp->req_count);
  	res = ld_le16(&cp->res_count);
  	phy = ld_le32(&cp->phy_addr);
  	phy += (req - res);
  	st_le16(&cp->req_count, res);
  	st_le16(&cp->res_count, 0);
  	st_le16(&cp->xfer_status, 0);
  	st_le32(&cp->phy_addr, phy);
  
  	st_le32(&cp->cmd_dep, rec->cmd.addr
  		+ sizeof(struct dbdma_cmd)*((rec->cur_period+1)%rec->nperiods));
  
  	st_le16(&cp->command, OUTPUT_MORE | BR_ALWAYS | INTR_ALWAYS);
  
  	/* point at our patched up command block */
  	out_le32(&rec->dma->cmdptr, emergency_dbdma.addr);
  
  	/* we must re-start the controller */
  	(void)in_le32(&rec->dma->status);
  	/* should complete clearing the DEAD status */
  	out_le32(&rec->dma->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
  }
  
  /*

   * update playback/capture pointer from interrupts
   */

  static void snd_pmac_pcm_update(struct snd_pmac *chip, struct pmac_stream *rec)

  {
  	volatile struct dbdma_cmd __iomem *cp;
  	int c;
  	int stat;
  
  	spin_lock(&chip->reg_lock);
  	if (rec->running) {

  		for (c = 0; c < rec->nperiods; c++) { /* at most all fragments */

  
  			if (emergency_in_use)   /* already using DEAD xfer? */
  				cp = emergency_dbdma.cmds;
  			else
  				cp = &rec->cmd.cmds[rec->cur_period];

  			stat = ld_le16(&cp->xfer_status);

  
  			if (stat & DEAD) {
  				snd_pmac_pcm_dead_xfer(rec, cp);
  				break; /* this block is still going */
  			}
  
  			if (emergency_in_use)
  				emergency_in_use = 0 ; /* done that */

  			if (! (stat & ACTIVE))
  				break;

  			/*printk(KERN_DEBUG "update frag %d
  ", rec->cur_period);*/

  			st_le16(&cp->xfer_status, 0);
  			st_le16(&cp->req_count, rec->period_size);
  			/*st_le16(&cp->res_count, 0);*/
  			rec->cur_period++;
  			if (rec->cur_period >= rec->nperiods) {
  				rec->cur_period = 0;

  			}

  			spin_unlock(&chip->reg_lock);
  			snd_pcm_period_elapsed(rec->substream);
  			spin_lock(&chip->reg_lock);
  		}
  	}
  	spin_unlock(&chip->reg_lock);
  }
  
  
  /*
   * hw info
   */

  static struct snd_pcm_hardware snd_pmac_playback =

  {
  	.info =			(SNDRV_PCM_INFO_INTERLEAVED |
  				 SNDRV_PCM_INFO_MMAP |
  				 SNDRV_PCM_INFO_MMAP_VALID |
  				 SNDRV_PCM_INFO_RESUME),
  	.formats =		SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_S16_LE,
  	.rates =		SNDRV_PCM_RATE_8000_44100,
  	.rate_min =		7350,
  	.rate_max =		44100,
  	.channels_min =		2,
  	.channels_max =		2,
  	.buffer_bytes_max =	131072,
  	.period_bytes_min =	256,
  	.period_bytes_max =	16384,
  	.periods_min =		3,
  	.periods_max =		PMAC_MAX_FRAGS,
  };

  static struct snd_pcm_hardware snd_pmac_capture =

  {
  	.info =			(SNDRV_PCM_INFO_INTERLEAVED |
  				 SNDRV_PCM_INFO_MMAP |
  				 SNDRV_PCM_INFO_MMAP_VALID |
  				 SNDRV_PCM_INFO_RESUME),
  	.formats =		SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_S16_LE,
  	.rates =		SNDRV_PCM_RATE_8000_44100,
  	.rate_min =		7350,
  	.rate_max =		44100,
  	.channels_min =		2,
  	.channels_max =		2,
  	.buffer_bytes_max =	131072,
  	.period_bytes_min =	256,
  	.period_bytes_max =	16384,
  	.periods_min =		3,
  	.periods_max =		PMAC_MAX_FRAGS,
  };
  
  
  #if 0 // NYI

  static int snd_pmac_hw_rule_rate(struct snd_pcm_hw_params *params,
  				 struct snd_pcm_hw_rule *rule)

  {

  	struct snd_pmac *chip = rule->private;
  	struct pmac_stream *rec = snd_pmac_get_stream(chip, rule->deps[0]);

  	int i, freq_table[8], num_freqs;

  	if (! rec)
  		return -EINVAL;

  	num_freqs = 0;
  	for (i = chip->num_freqs - 1; i >= 0; i--) {
  		if (rec->cur_freqs & (1 << i))
  			freq_table[num_freqs++] = chip->freq_table[i];
  	}
  
  	return snd_interval_list(hw_param_interval(params, rule->var),
  				 num_freqs, freq_table, 0);
  }

  static int snd_pmac_hw_rule_format(struct snd_pcm_hw_params *params,
  				   struct snd_pcm_hw_rule *rule)

  {

  	struct snd_pmac *chip = rule->private;
  	struct pmac_stream *rec = snd_pmac_get_stream(chip, rule->deps[0]);

  	if (! rec)
  		return -EINVAL;

  	return snd_mask_refine_set(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT),
  				   rec->cur_formats);
  }
  #endif // NYI

  static int snd_pmac_pcm_open(struct snd_pmac *chip, struct pmac_stream *rec,
  			     struct snd_pcm_substream *subs)

  {

  	struct snd_pcm_runtime *runtime = subs->runtime;

  	int i;

  
  	/* look up frequency table and fill bit mask */
  	runtime->hw.rates = 0;

  	for (i = 0; i < chip->num_freqs; i++)
  		if (chip->freqs_ok & (1 << i))
  			runtime->hw.rates |=
  				snd_pcm_rate_to_rate_bit(chip->freq_table[i]);

  
  	/* check for minimum and maximum rates */
  	for (i = 0; i < chip->num_freqs; i++) {
  		if (chip->freqs_ok & (1 << i)) {
  			runtime->hw.rate_max = chip->freq_table[i];
  			break;
  		}
  	}
  	for (i = chip->num_freqs - 1; i >= 0; i--) {
  		if (chip->freqs_ok & (1 << i)) {
  			runtime->hw.rate_min = chip->freq_table[i];
  			break;
  		}
  	}
  	runtime->hw.formats = chip->formats_ok;
  	if (chip->can_capture) {
  		if (! chip->can_duplex)
  			runtime->hw.info |= SNDRV_PCM_INFO_HALF_DUPLEX;
  		runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
  	}
  	runtime->private_data = rec;
  	rec->substream = subs;
  
  #if 0 /* FIXME: still under development.. */
  	snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
  			    snd_pmac_hw_rule_rate, chip, rec->stream, -1);
  	snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
  			    snd_pmac_hw_rule_format, chip, rec->stream, -1);
  #endif
  
  	runtime->hw.periods_max = rec->cmd.size - 1;

  	/* constraints to fix choppy sound */
  	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
  	return 0;
  }

  static int snd_pmac_pcm_close(struct snd_pmac *chip, struct pmac_stream *rec,
  			      struct snd_pcm_substream *subs)

  {

  	struct pmac_stream *astr;

  
  	snd_pmac_dma_stop(rec);
  
  	astr = snd_pmac_get_stream(chip, another_stream(rec->stream));

  	if (! astr)
  		return -EINVAL;

  
  	/* reset constraints */
  	astr->cur_freqs = chip->freqs_ok;
  	astr->cur_formats = chip->formats_ok;

  	return 0;
  }

  static int snd_pmac_playback_open(struct snd_pcm_substream *subs)

  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  
  	subs->runtime->hw = snd_pmac_playback;
  	return snd_pmac_pcm_open(chip, &chip->playback, subs);
  }

  static int snd_pmac_capture_open(struct snd_pcm_substream *subs)

  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  
  	subs->runtime->hw = snd_pmac_capture;
  	return snd_pmac_pcm_open(chip, &chip->capture, subs);
  }

  static int snd_pmac_playback_close(struct snd_pcm_substream *subs)

  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  
  	return snd_pmac_pcm_close(chip, &chip->playback, subs);
  }

  static int snd_pmac_capture_close(struct snd_pcm_substream *subs)

  {

  	struct snd_pmac *chip = snd_pcm_substream_chip(subs);

  
  	return snd_pmac_pcm_close(chip, &chip->capture, subs);
  }
  
  /*
   */

  static struct snd_pcm_ops snd_pmac_playback_ops = {

  	.open =		snd_pmac_playback_open,
  	.close =	snd_pmac_playback_close,
  	.ioctl =	snd_pcm_lib_ioctl,
  	.hw_params =	snd_pmac_pcm_hw_params,
  	.hw_free =	snd_pmac_pcm_hw_free,
  	.prepare =	snd_pmac_playback_prepare,
  	.trigger =	snd_pmac_playback_trigger,
  	.pointer =	snd_pmac_playback_pointer,
  };

  static struct snd_pcm_ops snd_pmac_capture_ops = {

  	.open =		snd_pmac_capture_open,
  	.close =	snd_pmac_capture_close,
  	.ioctl =	snd_pcm_lib_ioctl,
  	.hw_params =	snd_pmac_pcm_hw_params,
  	.hw_free =	snd_pmac_pcm_hw_free,
  	.prepare =	snd_pmac_capture_prepare,
  	.trigger =	snd_pmac_capture_trigger,
  	.pointer =	snd_pmac_capture_pointer,
  };

  int __devinit snd_pmac_pcm_new(struct snd_pmac *chip)

  {

  	struct snd_pcm *pcm;

  	int err;
  	int num_captures = 1;
  
  	if (! chip->can_capture)
  		num_captures = 0;
  	err = snd_pcm_new(chip->card, chip->card->driver, 0, 1, num_captures, &pcm);
  	if (err < 0)
  		return err;
  
  	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_pmac_playback_ops);
  	if (chip->can_capture)
  		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_pmac_capture_ops);
  
  	pcm->private_data = chip;

  	pcm->info_flags = SNDRV_PCM_INFO_JOINT_DUPLEX;
  	strcpy(pcm->name, chip->card->shortname);
  	chip->pcm = pcm;
  
  	chip->formats_ok = SNDRV_PCM_FMTBIT_S16_BE;
  	if (chip->can_byte_swap)
  		chip->formats_ok |= SNDRV_PCM_FMTBIT_S16_LE;
  
  	chip->playback.cur_formats = chip->formats_ok;
  	chip->capture.cur_formats = chip->formats_ok;
  	chip->playback.cur_freqs = chip->freqs_ok;
  	chip->capture.cur_freqs = chip->freqs_ok;
  
  	/* preallocate 64k buffer */

  	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
  					      &chip->pdev->dev,

  					      64 * 1024, 64 * 1024);
  
  	return 0;
  }

  static void snd_pmac_dbdma_reset(struct snd_pmac *chip)

  {
  	out_le32(&chip->playback.dma->control, (RUN|PAUSE|FLUSH|WAKE|DEAD) << 16);
  	snd_pmac_wait_ack(&chip->playback);
  	out_le32(&chip->capture.dma->control, (RUN|PAUSE|FLUSH|WAKE|DEAD) << 16);
  	snd_pmac_wait_ack(&chip->capture);
  }
  
  
  /*
   * handling beep
   */

  void snd_pmac_beep_dma_start(struct snd_pmac *chip, int bytes, unsigned long addr, int speed)

  {

  	struct pmac_stream *rec = &chip->playback;

  
  	snd_pmac_dma_stop(rec);
  	st_le16(&chip->extra_dma.cmds->req_count, bytes);
  	st_le16(&chip->extra_dma.cmds->xfer_status, 0);
  	st_le32(&chip->extra_dma.cmds->cmd_dep, chip->extra_dma.addr);
  	st_le32(&chip->extra_dma.cmds->phy_addr, addr);
  	st_le16(&chip->extra_dma.cmds->command, OUTPUT_MORE + BR_ALWAYS);
  	out_le32(&chip->awacs->control,
  		 (in_le32(&chip->awacs->control) & ~0x1f00)
  		 | (speed << 8));
  	out_le32(&chip->awacs->byteswap, 0);
  	snd_pmac_dma_set_command(rec, &chip->extra_dma);
  	snd_pmac_dma_run(rec, RUN);
  }

  void snd_pmac_beep_dma_stop(struct snd_pmac *chip)

  {
  	snd_pmac_dma_stop(&chip->playback);
  	st_le16(&chip->extra_dma.cmds->command, DBDMA_STOP);
  	snd_pmac_pcm_set_format(chip); /* reset format */
  }
  
  
  /*
   * interrupt handlers
   */
  static irqreturn_t

  snd_pmac_tx_intr(int irq, void *devid)

  {

  	struct snd_pmac *chip = devid;

  	snd_pmac_pcm_update(chip, &chip->playback);
  	return IRQ_HANDLED;
  }
  
  
  static irqreturn_t

  snd_pmac_rx_intr(int irq, void *devid)

  {

  	struct snd_pmac *chip = devid;

  	snd_pmac_pcm_update(chip, &chip->capture);
  	return IRQ_HANDLED;
  }
  
  
  static irqreturn_t

  snd_pmac_ctrl_intr(int irq, void *devid)

  {

  	struct snd_pmac *chip = devid;

  	int ctrl = in_le32(&chip->awacs->control);

  	/*printk(KERN_DEBUG "pmac: control interrupt.. 0x%x
  ", ctrl);*/

  	if (ctrl & MASK_PORTCHG) {
  		/* do something when headphone is plugged/unplugged? */
  		if (chip->update_automute)
  			chip->update_automute(chip, 1);
  	}
  	if (ctrl & MASK_CNTLERR) {
  		int err = (in_le32(&chip->awacs->codec_stat) & MASK_ERRCODE) >> 16;
  		if (err && chip->model <= PMAC_SCREAMER)
  			snd_printk(KERN_DEBUG "error %x
  ", err);
  	}
  	/* Writing 1s to the CNTLERR and PORTCHG bits clears them... */
  	out_le32(&chip->awacs->control, ctrl);
  	return IRQ_HANDLED;
  }
  
  
  /*
   * a wrapper to feature call for compatibility
   */

  static void snd_pmac_sound_feature(struct snd_pmac *chip, int enable)

  {

  	if (ppc_md.feature_call)
  		ppc_md.feature_call(PMAC_FTR_SOUND_CHIP_ENABLE, chip->node, 0, enable);

  }

  
  /*
   * release resources
   */

  static int snd_pmac_free(struct snd_pmac *chip)

  {

  	/* stop sounds */
  	if (chip->initialized) {
  		snd_pmac_dbdma_reset(chip);
  		/* disable interrupts from awacs interface */
  		out_le32(&chip->awacs->control, in_le32(&chip->awacs->control) & 0xfff);
  	}

  	if (chip->node)
  		snd_pmac_sound_feature(chip, 0);

  
  	/* clean up mixer if any */
  	if (chip->mixer_free)
  		chip->mixer_free(chip);
  
  	snd_pmac_detach_beep(chip);
  
  	/* release resources */
  	if (chip->irq >= 0)
  		free_irq(chip->irq, (void*)chip);
  	if (chip->tx_irq >= 0)
  		free_irq(chip->tx_irq, (void*)chip);
  	if (chip->rx_irq >= 0)
  		free_irq(chip->rx_irq, (void*)chip);

  	snd_pmac_dbdma_free(chip, &chip->playback.cmd);
  	snd_pmac_dbdma_free(chip, &chip->capture.cmd);
  	snd_pmac_dbdma_free(chip, &chip->extra_dma);

  	snd_pmac_dbdma_free(chip, &emergency_dbdma);

  	if (chip->macio_base)
  		iounmap(chip->macio_base);
  	if (chip->latch_base)
  		iounmap(chip->latch_base);
  	if (chip->awacs)
  		iounmap(chip->awacs);
  	if (chip->playback.dma)
  		iounmap(chip->playback.dma);
  	if (chip->capture.dma)
  		iounmap(chip->capture.dma);

  	if (chip->node) {

  		int i;

  		for (i = 0; i < 3; i++) {

  			if (chip->requested & (1 << i))
  				release_mem_region(chip->rsrc[i].start,

  						   resource_size(&chip->rsrc[i]));

  		}
  	}

  	if (chip->pdev)
  		pci_dev_put(chip->pdev);

  	of_node_put(chip->node);

  	kfree(chip);
  	return 0;
  }
  
  
  /*
   * free the device
   */

  static int snd_pmac_dev_free(struct snd_device *device)

  {

  	struct snd_pmac *chip = device->device_data;

  	return snd_pmac_free(chip);
  }
  
  
  /*
   * check the machine support byteswap (little-endian)
   */

  static void __devinit detect_byte_swap(struct snd_pmac *chip)

  {
  	struct device_node *mio;
  
  	/* if seems that Keylargo can't byte-swap  */
  	for (mio = chip->node->parent; mio; mio = mio->parent) {
  		if (strcmp(mio->name, "mac-io") == 0) {

  			if (of_device_is_compatible(mio, "Keylargo"))

  				chip->can_byte_swap = 0;
  			break;
  		}
  	}
  
  	/* it seems the Pismo & iBook can't byte-swap in hardware. */

  	if (of_machine_is_compatible("PowerBook3,1") ||
  	    of_machine_is_compatible("PowerBook2,1"))

  		chip->can_byte_swap = 0 ;

  	if (of_machine_is_compatible("PowerBook2,1"))

  		chip->can_duplex = 0;
  }
  
  
  /*
   * detect a sound chip
   */

  static int __devinit snd_pmac_detect(struct snd_pmac *chip)

  {

  	struct device_node *sound;
  	struct device_node *dn;

  	const unsigned int *prop;
  	unsigned int l;

  	struct macio_chip* macio;

  	if (!machine_is(powermac))

  		return -ENODEV;
  
  	chip->subframe = 0;
  	chip->revision = 0;
  	chip->freqs_ok = 0xff; /* all ok */
  	chip->model = PMAC_AWACS;
  	chip->can_byte_swap = 1;
  	chip->can_duplex = 1;
  	chip->can_capture = 1;
  	chip->num_freqs = ARRAY_SIZE(awacs_freqs);
  	chip->freq_table = awacs_freqs;

  	chip->pdev = NULL;

  
  	chip->control_mask = MASK_IEPC | MASK_IEE | 0x11; /* default */
  
  	/* check machine type */

  	if (of_machine_is_compatible("AAPL,3400/2400")
  	    || of_machine_is_compatible("AAPL,3500"))

  		chip->is_pbook_3400 = 1;

  	else if (of_machine_is_compatible("PowerBook1,1")
  		 || of_machine_is_compatible("AAPL,PowerBook1998"))

  		chip->is_pbook_G3 = 1;

  	chip->node = of_find_node_by_name(NULL, "awacs");
  	sound = of_node_get(chip->node);

  
  	/*
  	 * powermac G3 models have a node called "davbus"
  	 * with a child called "sound".
  	 */

  	if (!chip->node)

  		chip->node = of_find_node_by_name(NULL, "davbus");

  	/*
  	 * if we didn't find a davbus device, try 'i2s-a' since
  	 * this seems to be what iBooks have
  	 */

  	if (! chip->node) {

  		chip->node = of_find_node_by_name(NULL, "i2s-a");

  		if (chip->node && chip->node->parent &&
  		    chip->node->parent->parent) {

  			if (of_device_is_compatible(chip->node->parent->parent,

  						 "K2-Keylargo"))
  				chip->is_k2 = 1;
  		}
  	}

  	if (! chip->node)
  		return -ENODEV;

  	if (!sound) {

  		sound = of_find_node_by_name(NULL, "sound");

  		while (sound && sound->parent != chip->node)

  			sound = of_find_node_by_name(sound, "sound");

  	}

  	if (! sound) {
  		of_node_put(chip->node);

  		chip->node = NULL;

  		return -ENODEV;

  	}

  	prop = of_get_property(sound, "sub-frame", NULL);

  	if (prop && *prop < 16)
  		chip->subframe = *prop;

  	prop = of_get_property(sound, "layout-id", NULL);

  	if (prop) {
  		/* partly deprecate snd-powermac, for those machines
  		 * that have a layout-id property for now */
  		printk(KERN_INFO "snd-powermac no longer handles any "
  				 "machines with a layout-id property "
  				 "in the device-tree, use snd-aoa.
  ");

  		of_node_put(sound);

  		of_node_put(chip->node);

  		chip->node = NULL;

  		return -ENODEV;
  	}

  	/* This should be verified on older screamers */

  	if (of_device_is_compatible(sound, "screamer")) {

  		chip->model = PMAC_SCREAMER;
  		// chip->can_byte_swap = 0; /* FIXME: check this */
  	}

  	if (of_device_is_compatible(sound, "burgundy")) {

  		chip->model = PMAC_BURGUNDY;
  		chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */
  	}

  	if (of_device_is_compatible(sound, "daca")) {

  		chip->model = PMAC_DACA;
  		chip->can_capture = 0;  /* no capture */
  		chip->can_duplex = 0;
  		// chip->can_byte_swap = 0; /* FIXME: check this */
  		chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */
  	}

  	if (of_device_is_compatible(sound, "tumbler")) {

  		chip->model = PMAC_TUMBLER;

  		chip->can_capture = of_machine_is_compatible("PowerMac4,2")

  				|| of_machine_is_compatible("PowerBook3,2")
  				|| of_machine_is_compatible("PowerBook3,3")
  				|| of_machine_is_compatible("PowerBook4,1")
  				|| of_machine_is_compatible("PowerBook4,2")
  				|| of_machine_is_compatible("PowerBook4,3");

  		chip->can_duplex = 0;
  		// chip->can_byte_swap = 0; /* FIXME: check this */
  		chip->num_freqs = ARRAY_SIZE(tumbler_freqs);
  		chip->freq_table = tumbler_freqs;
  		chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */
  	}

  	if (of_device_is_compatible(sound, "snapper")) {

  		chip->model = PMAC_SNAPPER;
  		// chip->can_byte_swap = 0; /* FIXME: check this */
  		chip->num_freqs = ARRAY_SIZE(tumbler_freqs);
  		chip->freq_table = tumbler_freqs;
  		chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */
  	}

  	prop = of_get_property(sound, "device-id", NULL);

  	if (prop)
  		chip->device_id = *prop;

  	dn = of_find_node_by_name(NULL, "perch");
  	chip->has_iic = (dn != NULL);
  	of_node_put(dn);

  	/* We need the PCI device for DMA allocations, let's use a crude method
  	 * for now ...
  	 */
  	macio = macio_find(chip->node, macio_unknown);
  	if (macio == NULL)
  		printk(KERN_WARNING "snd-powermac: can't locate macio !
  ");
  	else {
  		struct pci_dev *pdev = NULL;
  
  		for_each_pci_dev(pdev) {
  			struct device_node *np = pci_device_to_OF_node(pdev);
  			if (np && np == macio->of_node) {
  				chip->pdev = pdev;
  				break;
  			}
  		}
  	}
  	if (chip->pdev == NULL)

  		printk(KERN_WARNING "snd-powermac: can't locate macio PCI"
  		       " device !
  ");

  	detect_byte_swap(chip);
  
  	/* look for a property saying what sample rates
  	   are available */

  	prop = of_get_property(sound, "sample-rates", &l);

  	if (! prop)

  		prop = of_get_property(sound, "output-frame-rates", &l);

  	if (prop) {
  		int i;
  		chip->freqs_ok = 0;
  		for (l /= sizeof(int); l > 0; --l) {
  			unsigned int r = *prop++;
  			/* Apple 'Fixed' format */
  			if (r >= 0x10000)
  				r >>= 16;
  			for (i = 0; i < chip->num_freqs; ++i) {
  				if (r == chip->freq_table[i]) {
  					chip->freqs_ok |= (1 << i);
  					break;
  				}
  			}
  		}
  	} else {
  		/* assume only 44.1khz */
  		chip->freqs_ok = 1;
  	}

  	of_node_put(sound);

  	return 0;
  }

  #ifdef PMAC_SUPPORT_AUTOMUTE
  /*
   * auto-mute
   */

  static int pmac_auto_mute_get(struct snd_kcontrol *kcontrol,
  			      struct snd_ctl_elem_value *ucontrol)

  {

  	struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);

  	ucontrol->value.integer.value[0] = chip->auto_mute;
  	return 0;
  }

  static int pmac_auto_mute_put(struct snd_kcontrol *kcontrol,
  			      struct snd_ctl_elem_value *ucontrol)

  {

  	struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);

  	if (ucontrol->value.integer.value[0] != chip->auto_mute) {

  		chip->auto_mute = !!ucontrol->value.integer.value[0];

  		if (chip->update_automute)
  			chip->update_automute(chip, 1);
  		return 1;
  	}
  	return 0;
  }

  static int pmac_hp_detect_get(struct snd_kcontrol *kcontrol,
  			      struct snd_ctl_elem_value *ucontrol)

  {

  	struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);

  	if (chip->detect_headphone)
  		ucontrol->value.integer.value[0] = chip->detect_headphone(chip);
  	else
  		ucontrol->value.integer.value[0] = 0;
  	return 0;
  }

  static struct snd_kcontrol_new auto_mute_controls[] __devinitdata = {

  	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  	  .name = "Auto Mute Switch",
  	  .info = snd_pmac_boolean_mono_info,
  	  .get = pmac_auto_mute_get,
  	  .put = pmac_auto_mute_put,
  	},
  	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  	  .name = "Headphone Detection",
  	  .access = SNDRV_CTL_ELEM_ACCESS_READ,
  	  .info = snd_pmac_boolean_mono_info,
  	  .get = pmac_hp_detect_get,
  	},
  };

  int __devinit snd_pmac_add_automute(struct snd_pmac *chip)

  {
  	int err;
  	chip->auto_mute = 1;
  	err = snd_ctl_add(chip->card, snd_ctl_new1(&auto_mute_controls[0], chip));

  	if (err < 0) {
  		printk(KERN_ERR "snd-powermac: Failed to add automute control
  ");

  		return err;

  	}

  	chip->hp_detect_ctl = snd_ctl_new1(&auto_mute_controls[1], chip);
  	return snd_ctl_add(chip->card, chip->hp_detect_ctl);
  }
  #endif /* PMAC_SUPPORT_AUTOMUTE */
  
  /*
   * create and detect a pmac chip record
   */

  int __devinit snd_pmac_new(struct snd_card *card, struct snd_pmac **chip_return)

  {

  	struct snd_pmac *chip;

  	struct device_node *np;
  	int i, err;

  	unsigned int irq;

  	unsigned long ctrl_addr, txdma_addr, rxdma_addr;

  	static struct snd_device_ops ops = {

  		.dev_free =	snd_pmac_dev_free,
  	};

  	*chip_return = NULL;

  	chip = kzalloc(sizeof(*chip), GFP_KERNEL);

  	if (chip == NULL)
  		return -ENOMEM;
  	chip->card = card;
  
  	spin_lock_init(&chip->reg_lock);
  	chip->irq = chip->tx_irq = chip->rx_irq = -1;
  
  	chip->playback.stream = SNDRV_PCM_STREAM_PLAYBACK;
  	chip->capture.stream = SNDRV_PCM_STREAM_CAPTURE;
  
  	if ((err = snd_pmac_detect(chip)) < 0)
  		goto __error;

  	if (snd_pmac_dbdma_alloc(chip, &chip->playback.cmd, PMAC_MAX_FRAGS + 1) < 0 ||
  	    snd_pmac_dbdma_alloc(chip, &chip->capture.cmd, PMAC_MAX_FRAGS + 1) < 0 ||

  	    snd_pmac_dbdma_alloc(chip, &chip->extra_dma, 2) < 0 ||
  	    snd_pmac_dbdma_alloc(chip, &emergency_dbdma, 2) < 0) {

  		err = -ENOMEM;
  		goto __error;
  	}
  
  	np = chip->node;

  	chip->requested = 0;

  	if (chip->is_k2) {

  		static char *rnames[] = {
  			"Sound Control", "Sound DMA" };

  		for (i = 0; i < 2; i ++) {
  			if (of_address_to_resource(np->parent, i,
  						   &chip->rsrc[i])) {
  				printk(KERN_ERR "snd: can't translate rsrc "
  				       " %d (%s)
  ", i, rnames[i]);
  				err = -ENODEV;
  				goto __error;
  			}
  			if (request_mem_region(chip->rsrc[i].start,

  					       resource_size(&chip->rsrc[i]),

  					       rnames[i]) == NULL) {
  				printk(KERN_ERR "snd: can't request rsrc "

  				       " %d (%s: %pR)
  ",
  				       i, rnames[i], &chip->rsrc[i]);

  				err = -ENODEV;
  				goto __error;
  			}

  			chip->requested |= (1 << i);

  		}

  		ctrl_addr = chip->rsrc[0].start;
  		txdma_addr = chip->rsrc[1].start;
  		rxdma_addr = txdma_addr + 0x100;

  	} else {

  		static char *rnames[] = {
  			"Sound Control", "Sound Tx DMA", "Sound Rx DMA" };

  		for (i = 0; i < 3; i ++) {

  			if (of_address_to_resource(np, i,

  						   &chip->rsrc[i])) {
  				printk(KERN_ERR "snd: can't translate rsrc "
  				       " %d (%s)
  ", i, rnames[i]);
  				err = -ENODEV;
  				goto __error;
  			}
  			if (request_mem_region(chip->rsrc[i].start,

  					       resource_size(&chip->rsrc[i]),

  					       rnames[i]) == NULL) {
  				printk(KERN_ERR "snd: can't request rsrc "

  				       " %d (%s: %pR)
  ",
  				       i, rnames[i], &chip->rsrc[i]);

  				err = -ENODEV;
  				goto __error;
  			}

  			chip->requested |= (1 << i);

  		}

  		ctrl_addr = chip->rsrc[0].start;
  		txdma_addr = chip->rsrc[1].start;
  		rxdma_addr = chip->rsrc[2].start;

  	}

  	chip->awacs = ioremap(ctrl_addr, 0x1000);
  	chip->playback.dma = ioremap(txdma_addr, 0x100);
  	chip->capture.dma = ioremap(rxdma_addr, 0x100);

  	if (chip->model <= PMAC_BURGUNDY) {

  		irq = irq_of_parse_and_map(np, 0);
  		if (request_irq(irq, snd_pmac_ctrl_intr, 0,

  				"PMac", (void*)chip)) {

  			snd_printk(KERN_ERR "pmac: unable to grab IRQ %d
  ",
  				   irq);

  			err = -EBUSY;
  			goto __error;
  		}

  		chip->irq = irq;

  	}

  	irq = irq_of_parse_and_map(np, 1);
  	if (request_irq(irq, snd_pmac_tx_intr, 0, "PMac Output", (void*)chip)){
  		snd_printk(KERN_ERR "pmac: unable to grab IRQ %d
  ", irq);

  		err = -EBUSY;
  		goto __error;
  	}

  	chip->tx_irq = irq;
  	irq = irq_of_parse_and_map(np, 2);
  	if (request_irq(irq, snd_pmac_rx_intr, 0, "PMac Input", (void*)chip)) {
  		snd_printk(KERN_ERR "pmac: unable to grab IRQ %d
  ", irq);

  		err = -EBUSY;
  		goto __error;
  	}

  	chip->rx_irq = irq;

  
  	snd_pmac_sound_feature(chip, 1);

  	/* reset & enable interrupts */
  	if (chip->model <= PMAC_BURGUNDY)
  		out_le32(&chip->awacs->control, chip->control_mask);

  
  	/* Powerbooks have odd ways of enabling inputs such as
  	   an expansion-bay CD or sound from an internal modem
  	   or a PC-card modem. */
  	if (chip->is_pbook_3400) {
  		/* Enable CD and PC-card sound inputs. */
  		/* This is done by reading from address
  		 * f301a000, + 0x10 to enable the expansion-bay
  		 * CD sound input, + 0x80 to enable the PC-card
  		 * sound input.  The 0x100 enables the SCSI bus
  		 * terminator power.
  		 */
  		chip->latch_base = ioremap (0xf301a000, 0x1000);
  		in_8(chip->latch_base + 0x190);
  	} else if (chip->is_pbook_G3) {
  		struct device_node* mio;
  		for (mio = chip->node->parent; mio; mio = mio->parent) {

  			if (strcmp(mio->name, "mac-io") == 0) {
  				struct resource r;
  				if (of_address_to_resource(mio, 0, &r) == 0)
  					chip->macio_base =
  						ioremap(r.start, 0x40);

  				break;
  			}
  		}
  		/* Enable CD sound input. */
  		/* The relevant bits for writing to this byte are 0x8f.
  		 * I haven't found out what the 0x80 bit does.
  		 * For the 0xf bits, writing 3 or 7 enables the CD
  		 * input, any other value disables it.  Values
  		 * 1, 3, 5, 7 enable the microphone.  Values 0, 2,
  		 * 4, 6, 8 - f enable the input from the modem.
  		 */
  		if (chip->macio_base)
  			out_8(chip->macio_base + 0x37, 3);
  	}
  
  	/* Reset dbdma channels */
  	snd_pmac_dbdma_reset(chip);

  	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
  		goto __error;
  
  	*chip_return = chip;
  	return 0;
  
   __error:
  	snd_pmac_free(chip);
  	return err;
  }
  
  
  /*
   * sleep notify for powerbook
   */

  #ifdef CONFIG_PM

  
  /*
   * Save state when going to sleep, restore it afterwards.
   */

  void snd_pmac_suspend(struct snd_pmac *chip)

  {

  	unsigned long flags;

  	snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);

  	if (chip->suspend)
  		chip->suspend(chip);
  	snd_pcm_suspend_all(chip->pcm);
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	snd_pmac_beep_stop(chip);
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  	if (chip->irq >= 0)
  		disable_irq(chip->irq);
  	if (chip->tx_irq >= 0)
  		disable_irq(chip->tx_irq);
  	if (chip->rx_irq >= 0)
  		disable_irq(chip->rx_irq);
  	snd_pmac_sound_feature(chip, 0);

  }

  void snd_pmac_resume(struct snd_pmac *chip)

  {

  	snd_pmac_sound_feature(chip, 1);
  	if (chip->resume)
  		chip->resume(chip);
  	/* enable CD sound input */

  	if (chip->macio_base && chip->is_pbook_G3)

  		out_8(chip->macio_base + 0x37, 3);

  	else if (chip->is_pbook_3400)

  		in_8(chip->latch_base + 0x190);

  
  	snd_pmac_pcm_set_format(chip);
  
  	if (chip->irq >= 0)
  		enable_irq(chip->irq);
  	if (chip->tx_irq >= 0)
  		enable_irq(chip->tx_irq);
  	if (chip->rx_irq >= 0)
  		enable_irq(chip->rx_irq);

  	snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);

  }

  #endif /* CONFIG_PM */