Release 4.7 sound/soc/atmel/atmel_ssc_dai.c

/*
 * atmel_ssc_dai.c  --  ALSA SoC ATMEL SSC Audio Layer Platform driver
 *
 * Copyright (C) 2005 SAN People
 * Copyright (C) 2008 Atmel
 *
 * Author: Sedji Gaouaou <sedji.gaouaou@atmel.com>
 *         ATMEL CORP.
 *
 * Based on at91-ssc.c by
 * Frank Mandarino <fmandarino@endrelia.com>
 * Based on pxa2xx Platform drivers by
 * Liam Girdwood <lrg@slimlogic.co.uk>
 *
 * 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/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/atmel_pdc.h>

#include <linux/atmel-ssc.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "atmel-pcm.h"
#include "atmel_ssc_dai.h"



#define NUM_SSC_DEVICES		3

/*
 * SSC PDC registers required by the PCM DMA engine.
 */

static struct atmel_pdc_regs pdc_tx_reg = {
	.xpr		= ATMEL_PDC_TPR,
	.xcr		= ATMEL_PDC_TCR,
	.xnpr		= ATMEL_PDC_TNPR,
	.xncr		= ATMEL_PDC_TNCR,
};


static struct atmel_pdc_regs pdc_rx_reg = {
	.xpr		= ATMEL_PDC_RPR,
	.xcr		= ATMEL_PDC_RCR,
	.xnpr		= ATMEL_PDC_RNPR,
	.xncr		= ATMEL_PDC_RNCR,
};

/*
 * SSC & PDC status bits for transmit and receive.
 */

static struct atmel_ssc_mask ssc_tx_mask = {
	.ssc_enable	= SSC_BIT(CR_TXEN),
	.ssc_disable	= SSC_BIT(CR_TXDIS),
	.ssc_endx	= SSC_BIT(SR_ENDTX),
	.ssc_endbuf	= SSC_BIT(SR_TXBUFE),
	.ssc_error	= SSC_BIT(SR_OVRUN),
	.pdc_enable	= ATMEL_PDC_TXTEN,
	.pdc_disable	= ATMEL_PDC_TXTDIS,
};


static struct atmel_ssc_mask ssc_rx_mask = {
	.ssc_enable	= SSC_BIT(CR_RXEN),
	.ssc_disable	= SSC_BIT(CR_RXDIS),
	.ssc_endx	= SSC_BIT(SR_ENDRX),
	.ssc_endbuf	= SSC_BIT(SR_RXBUFF),
	.ssc_error	= SSC_BIT(SR_OVRUN),
	.pdc_enable	= ATMEL_PDC_RXTEN,
	.pdc_disable	= ATMEL_PDC_RXTDIS,
};


/*
 * DMA parameters.
 */

static struct atmel_pcm_dma_params ssc_dma_params[NUM_SSC_DEVICES][2] = {
	{{
	.name		= "SSC0 PCM out",
	.pdc		= &pdc_tx_reg,
	.mask		= &ssc_tx_mask,
        },
	{
	.name		= "SSC0 PCM in",
	.pdc		= &pdc_rx_reg,
	.mask		= &ssc_rx_mask,
        } },
	{{
	.name		= "SSC1 PCM out",
	.pdc		= &pdc_tx_reg,
	.mask		= &ssc_tx_mask,
        },
	{
	.name		= "SSC1 PCM in",
	.pdc		= &pdc_rx_reg,
	.mask		= &ssc_rx_mask,
        } },
	{{
	.name		= "SSC2 PCM out",
	.pdc		= &pdc_tx_reg,
	.mask		= &ssc_tx_mask,
        },
	{
	.name		= "SSC2 PCM in",
	.pdc		= &pdc_rx_reg,
	.mask		= &ssc_rx_mask,
        } },
};



static struct atmel_ssc_info ssc_info[NUM_SSC_DEVICES] = {
	{
	.name		= "ssc0",
	.lock		= __SPIN_LOCK_UNLOCKED(ssc_info[0].lock),
	.dir_mask	= SSC_DIR_MASK_UNUSED,
	.initialized	= 0,
        },
	{
	.name		= "ssc1",
	.lock		= __SPIN_LOCK_UNLOCKED(ssc_info[1].lock),
	.dir_mask	= SSC_DIR_MASK_UNUSED,
	.initialized	= 0,
        },
	{
	.name		= "ssc2",
	.lock		= __SPIN_LOCK_UNLOCKED(ssc_info[2].lock),
	.dir_mask	= SSC_DIR_MASK_UNUSED,
	.initialized	= 0,
        },
};


/*
 * SSC interrupt handler.  Passes PDC interrupts to the DMA
 * interrupt handler in the PCM driver.
 */


static irqreturn_t atmel_ssc_interrupt(int irq, void *dev_id)
{
	struct atmel_ssc_info *ssc_p = dev_id;
	struct atmel_pcm_dma_params *dma_params;
	u32 ssc_sr;
	u32 ssc_substream_mask;
	int i;

	ssc_sr = (unsigned long)ssc_readl(ssc_p->ssc->regs, SR)
			& (unsigned long)ssc_readl(ssc_p->ssc->regs, IMR);

	/*
         * Loop through the substreams attached to this SSC.  If
         * a DMA-related interrupt occurred on that substream, call
         * the DMA interrupt handler function, if one has been
         * registered in the dma_params structure by the PCM driver.
         */
	for (i = 0; i < ARRAY_SIZE(ssc_p->dma_params); i++) {
		dma_params = ssc_p->dma_params[i];

		if ((dma_params != NULL) &&
			(dma_params->dma_intr_handler != NULL)) {
			ssc_substream_mask = (dma_params->mask->ssc_endx |
					dma_params->mask->ssc_endbuf);
			if (ssc_sr & ssc_substream_mask) {
				dma_params->dma_intr_handler(ssc_sr,
						dma_params->
						substream);
			}
		}
	}

	return IRQ_HANDLED;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
geoffrey wossum
geoffrey wossum
141
92.76%
1
50.00%
sedji gaouaou
sedji gaouaou
11
7.24%
1
50.00%
Total
152
100.00%
2
100.00%

/*
 * When the bit clock is input, limit the maximum rate according to the
 * Serial Clock Ratio Considerations section from the SSC documentation:
 *
 *   The Transmitter and the Receiver can be programmed to operate
 *   with the clock signals provided on either the TK or RK pins.
 *   This allows the SSC to support many slave-mode data transfers.
 *   In this case, the maximum clock speed allowed on the RK pin is:
 *   - Peripheral clock divided by 2 if Receiver Frame Synchro is input
 *   - Peripheral clock divided by 3 if Receiver Frame Synchro is output
 *   In addition, the maximum clock speed allowed on the TK pin is:
 *   - Peripheral clock divided by 6 if Transmit Frame Synchro is input
 *   - Peripheral clock divided by 2 if Transmit Frame Synchro is output
 *
 * When the bit clock is output, limit the rate according to the
 * SSC divider restrictions.
 */


static int atmel_ssc_hw_rule_rate(struct snd_pcm_hw_params *params,
				  struct snd_pcm_hw_rule *rule)
{
	struct atmel_ssc_info *ssc_p = rule->private;
	struct ssc_device *ssc = ssc_p->ssc;
	struct snd_interval *i = hw_param_interval(params, rule->var);
	struct snd_interval t;
	struct snd_ratnum r = {
		.den_min = 1,
		.den_max = 4095,
		.den_step = 1,
        };
	unsigned int num = 0, den = 0;
	int frame_size;
	int mck_div = 2;
	int ret;

	frame_size = snd_soc_params_to_frame_size(params);
	if (frame_size < 0)
		return frame_size;

	switch (ssc_p->daifmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFS:
		if ((ssc_p->dir_mask & SSC_DIR_MASK_CAPTURE)
		    && ssc->clk_from_rk_pin)
			/* Receiver Frame Synchro (i.e. capture)
                         * is output (format is _CFS) and the RK pin
                         * is used for input (format is _CBM_).
                         */
			mck_div = 3;
		break;

	case SND_SOC_DAIFMT_CBM_CFM:
		if ((ssc_p->dir_mask & SSC_DIR_MASK_PLAYBACK)
		    && !ssc->clk_from_rk_pin)
			/* Transmit Frame Synchro (i.e. playback)
                         * is input (format is _CFM) and the TK pin
                         * is used for input (format _CBM_ but not
                         * using the RK pin).
                         */
			mck_div = 6;
		break;
	}

	switch (ssc_p->daifmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
		r.num = ssc_p->mck_rate / mck_div / frame_size;

		ret = snd_interval_ratnum(i, 1, &r, &num, &den);
		if (ret >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
			params->rate_num = num;
			params->rate_den = den;
		}
		break;

	case SND_SOC_DAIFMT_CBM_CFS:
	case SND_SOC_DAIFMT_CBM_CFM:
		t.min = 8000;
		t.max = ssc_p->mck_rate / mck_div / frame_size;
		t.openmin = t.openmax = 0;
		t.integer = 0;
		ret = snd_interval_refine(i, &t);
		break;

	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
peter rosin
peter rosin
300
100.00%
1
100.00%
Total
300
100.00%
1
100.00%

/*-------------------------------------------------------------------------*\
 * DAI functions
\*-------------------------------------------------------------------------*/
/*
 * Startup.  Only that one substream allowed in each direction.
 */


static int atmel_ssc_startup(struct snd_pcm_substream *substream,
			     struct snd_soc_dai *dai)
{
	struct platform_device *pdev = to_platform_device(dai->dev);
	struct atmel_ssc_info *ssc_p = &ssc_info[pdev->id];
	struct atmel_pcm_dma_params *dma_params;
	int dir, dir_mask;
	int ret;

	pr_debug("atmel_ssc_startup: SSC_SR=0x%x\n",
		ssc_readl(ssc_p->ssc->regs, SR));

	/* Enable PMC peripheral clock for this SSC */
	pr_debug("atmel_ssc_dai: Starting clock\n");
	clk_enable(ssc_p->ssc->clk);
	ssc_p->mck_rate = clk_get_rate(ssc_p->ssc->clk);

	/* Reset the SSC to keep it at a clean status */
	ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		dir = 0;
		dir_mask = SSC_DIR_MASK_PLAYBACK;
	} else {
		dir = 1;
		dir_mask = SSC_DIR_MASK_CAPTURE;
	}

	ret = snd_pcm_hw_rule_add(substream->runtime, 0,
				  SNDRV_PCM_HW_PARAM_RATE,
				  atmel_ssc_hw_rule_rate,
				  ssc_p,
				  SNDRV_PCM_HW_PARAM_FRAME_BITS,
				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (ret < 0) {
		dev_err(dai->dev, "Failed to specify rate rule: %d\n", ret);
		return ret;
	}

	dma_params = &ssc_dma_params[dai->id][dir];
	dma_params->ssc = ssc_p->ssc;
	dma_params->substream = substream;

	ssc_p->dma_params[dir] = dma_params;

	snd_soc_dai_set_dma_data(dai, substream, dma_params);

	spin_lock_irq(&ssc_p->lock);
	if (ssc_p->dir_mask & dir_mask) {
		spin_unlock_irq(&ssc_p->lock);
		return -EBUSY;
	}
	ssc_p->dir_mask |= dir_mask;
	spin_unlock_irq(&ssc_p->lock);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
bo shen
bo shen
96
34.04%
2
25.00%
geoffrey wossum
geoffrey wossum
79
28.01%
1
12.50%
peter rosin
peter rosin
62
21.99%
1
12.50%
sedji gaouaou
sedji gaouaou
26
9.22%
1
12.50%
songjun wu
songjun wu
13
4.61%
1
12.50%
mark brown
mark brown
5
1.77%
1
12.50%
joe perches
joe perches
1
0.35%
1
12.50%
Total
282
100.00%
8
100.00%

/*
 * Shutdown.  Clear DMA parameters and shutdown the SSC if there
 * are no other substreams open.
 */


static void atmel_ssc_shutdown(struct snd_pcm_substream *substream,
			       struct snd_soc_dai *dai)
{
	struct platform_device *pdev = to_platform_device(dai->dev);
	struct atmel_ssc_info *ssc_p = &ssc_info[pdev->id];
	struct atmel_pcm_dma_params *dma_params;
	int dir, dir_mask;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dir = 0;
	else
		dir = 1;

	dma_params = ssc_p->dma_params[dir];

	if (dma_params != NULL) {
		dma_params->ssc = NULL;
		dma_params->substream = NULL;
		ssc_p->dma_params[dir] = NULL;
	}

	dir_mask = 1 << dir;

	spin_lock_irq(&ssc_p->lock);
	ssc_p->dir_mask &= ~dir_mask;
	if (!ssc_p->dir_mask) {
		if (ssc_p->initialized) {
			free_irq(ssc_p->ssc->irq, ssc_p);
			ssc_p->initialized = 0;
		}

		/* Reset the SSC */
		ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
		/* Clear the SSC dividers */
		ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0;
	}
	spin_unlock_irq(&ssc_p->lock);

	/* Shutdown the SSC clock. */
	pr_debug("atmel_ssc_dai: Stopping clock\n");
	clk_disable(ssc_p->ssc->clk);
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
geoffrey wossum
geoffrey wossum
152
70.37%
1
20.00%
sedji gaouaou
sedji gaouaou
31
14.35%
1
20.00%
bo shen
bo shen
15
6.94%
1
20.00%
songjun wu
songjun wu
13
6.02%
1
20.00%
mark brown
mark brown
5
2.31%
1
20.00%
Total
216
100.00%
5
100.00%

/*
 * Record the DAI format for use in hw_params().
 */


static int atmel_ssc_set_dai_fmt(struct snd_soc_dai *cpu_dai,
		unsigned int fmt)
{
	struct platform_device *pdev = to_platform_device(cpu_dai->dev);
	struct atmel_ssc_info *ssc_p = &ssc_info[pdev->id];

	ssc_p->daifmt = fmt;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
geoffrey wossum
geoffrey wossum
33
67.35%
1
25.00%
songjun wu
songjun wu
13
26.53%
1
25.00%
sedji gaouaou
sedji gaouaou
2
4.08%
1
25.00%
liam girdwood
liam girdwood
1
2.04%
1
25.00%
Total
49
100.00%
4
100.00%

/*
 * Record SSC clock dividers for use in hw_params().
 */


static int atmel_ssc_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
	int div_id, int div)
{
	struct platform_device *pdev = to_platform_device(cpu_dai->dev);
	struct atmel_ssc_info *ssc_p = &ssc_info[pdev->id];

	switch (div_id) {
	case ATMEL_SSC_CMR_DIV:
		/*
                 * The same master clock divider is used for both
                 * transmit and receive, so if a value has already
                 * been set, it must match this value.
                 */
		if (ssc_p->dir_mask !=
			(SSC_DIR_MASK_PLAYBACK | SSC_DIR_MASK_CAPTURE))
			ssc_p->cmr_div = div;
		else if (ssc_p->cmr_div == 0)
			ssc_p->cmr_div = div;
		else
			if (div != ssc_p->cmr_div)
				return -EBUSY;
		break;

	case ATMEL_SSC_TCMR_PERIOD:
		ssc_p->tcmr_period = div;
		break;

	case ATMEL_SSC_RCMR_PERIOD:
		ssc_p->rcmr_period = div;
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
geoffrey wossum
geoffrey wossum
88
69.29%
1
20.00%
peter rosin
peter rosin
19
14.96%
1
20.00%
songjun wu
songjun wu
13
10.24%
1
20.00%
sedji gaouaou
sedji gaouaou
6
4.72%
1
20.00%
liam girdwood
liam girdwood
1
0.79%
1
20.00%
Total
127
100.00%
5
100.00%

/*
 * Configure the SSC.
 */


static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
{
	struct platform_device *pdev = to_platform_device(dai->dev);
	int id = pdev->id;
	struct atmel_ssc_info *ssc_p = &ssc_info[id];
	struct ssc_device *ssc = ssc_p->ssc;
	struct atmel_pcm_dma_params *dma_params;
	int dir, channels, bits;
	u32 tfmr, rfmr, tcmr, rcmr;
	int ret;
	int fslen, fslen_ext;

	/*
         * Currently, there is only one set of dma params for
         * each direction.  If more are added, this code will
         * have to be changed to select the proper set.
         */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dir = 0;
	else
		dir = 1;

	dma_params = ssc_p->dma_params[dir];

	channels = params_channels(params);

	/*
         * Determine sample size in bits and the PDC increment.
         */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		bits = 8;
		dma_params->pdc_xfer_size = 1;
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		bits = 16;
		dma_params->pdc_xfer_size = 2;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		bits = 24;
		dma_params->pdc_xfer_size = 4;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		bits = 32;
		dma_params->pdc_xfer_size = 4;
		break;
	default:
		printk(KERN_WARNING "atmel_ssc_dai: unsupported PCM format");
		return -EINVAL;
	}

	/*
         * Compute SSC register settings.
         */
	switch (ssc_p->daifmt
		& (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_MASTER_MASK)) {

	case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS:
		/*
                 * I2S format, SSC provides BCLK and LRC clocks.
                 *
                 * The SSC transmit and receive clocks are generated
                 * from the MCK divider, and the BCLK signal
                 * is output on the SSC TK line.
                 */

		if (bits > 16 && !ssc->pdata->has_fslen_ext) {
			dev_err(dai->dev,
				"sample size %d is too large for SSC device\n",
				bits);
			return -EINVAL;
		}

		fslen_ext = (bits - 1) / 16;
		fslen = (bits - 1) % 16;

		rcmr =	  SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
			| SSC_BF(RCMR_STTDLY, START_DELAY)
			| SSC_BF(RCMR_START, SSC_START_FALLING_RF)
			| SSC_BF(RCMR_CKI, SSC_CKI_RISING)
			| SSC_BF(RCMR_CKO, SSC_CKO_NONE)
			| SSC_BF(RCMR_CKS, SSC_CKS_DIV);

		rfmr =    SSC_BF(RFMR_FSLEN_EXT, fslen_ext)
			| SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
			| SSC_BF(RFMR_FSLEN, fslen)
			| SSC_BF(RFMR_DATNB, (channels - 1))
			| SSC_BIT(RFMR_MSBF)
			| SSC_BF(RFMR_LOOP, 0)
			| SSC_BF(RFMR_DATLEN, (bits - 1));

		tcmr =	  SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
			| SSC_BF(TCMR_STTDLY, START_DELAY)
			| SSC_BF(TCMR_START, SSC_START_FALLING_RF)
			| SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
			| SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
			| SSC_BF(TCMR_CKS, SSC_CKS_DIV);

		tfmr =    SSC_BF(TFMR_FSLEN_EXT, fslen_ext)
			| SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(TFMR_FSDEN, 0)
			| SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
			| SSC_BF(TFMR_FSLEN, fslen)
			| SSC_BF(TFMR_DATNB, (channels - 1))
			| SSC_BIT(TFMR_MSBF)
			| SSC_BF(TFMR_DATDEF, 0)
			| SSC_BF(TFMR_DATLEN, (bits - 1));
		break;

	case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM:
		/* I2S format, CODEC supplies BCLK and LRC clocks. */
		rcmr =	  SSC_BF(RCMR_PERIOD, 0)
			| SSC_BF(RCMR_STTDLY, START_DELAY)
			| SSC_BF(RCMR_START, SSC_START_FALLING_RF)
			| SSC_BF(RCMR_CKI, SSC_CKI_RISING)
			| SSC_BF(RCMR_CKO, SSC_CKO_NONE)
			| SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
					   SSC_CKS_PIN : SSC_CKS_CLOCK);

		rfmr =	  SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
			| SSC_BF(RFMR_FSLEN, 0)
			| SSC_BF(RFMR_DATNB, (channels - 1))
			| SSC_BIT(RFMR_MSBF)
			| SSC_BF(RFMR_LOOP, 0)
			| SSC_BF(RFMR_DATLEN, (bits - 1));

		tcmr =	  SSC_BF(TCMR_PERIOD, 0)
			| SSC_BF(TCMR_STTDLY, START_DELAY)
			| SSC_BF(TCMR_START, SSC_START_FALLING_RF)
			| SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
			| SSC_BF(TCMR_CKO, SSC_CKO_NONE)
			| SSC_BF(TCMR_CKS, ssc->clk_from_rk_pin ?
					   SSC_CKS_CLOCK : SSC_CKS_PIN);

		tfmr =	  SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(TFMR_FSDEN, 0)
			| SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
			| SSC_BF(TFMR_FSLEN, 0)
			| SSC_BF(TFMR_DATNB, (channels - 1))
			| SSC_BIT(TFMR_MSBF)
			| SSC_BF(TFMR_DATDEF, 0)
			| SSC_BF(TFMR_DATLEN, (bits - 1));
		break;

	case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFS:
		/* I2S format, CODEC supplies BCLK, SSC supplies LRCLK. */
		if (bits > 16 && !ssc->pdata->has_fslen_ext) {
			dev_err(dai->dev,
				"sample size %d is too large for SSC device\n",
				bits);
			return -EINVAL;
		}

		fslen_ext = (bits - 1) / 16;
		fslen = (bits - 1) % 16;

		rcmr =	  SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
			| SSC_BF(RCMR_STTDLY, START_DELAY)
			| SSC_BF(RCMR_START, SSC_START_FALLING_RF)
			| SSC_BF(RCMR_CKI, SSC_CKI_RISING)
			| SSC_BF(RCMR_CKO, SSC_CKO_NONE)
			| SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
					   SSC_CKS_PIN : SSC_CKS_CLOCK);

		rfmr =    SSC_BF(RFMR_FSLEN_EXT, fslen_ext)
			| SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
			| SSC_BF(RFMR_FSLEN, fslen)
			| SSC_BF(RFMR_DATNB, (channels - 1))
			| SSC_BIT(RFMR_MSBF)
			| SSC_BF(RFMR_LOOP, 0)
			| SSC_BF(RFMR_DATLEN, (bits - 1));

		tcmr =	  SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
			| SSC_BF(TCMR_STTDLY, START_DELAY)
			| SSC_BF(TCMR_START, SSC_START_FALLING_RF)
			| SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
			| SSC_BF(TCMR_CKO, SSC_CKO_NONE)
			| SSC_BF(TCMR_CKS, ssc->clk_from_rk_pin ?
					   SSC_CKS_CLOCK : SSC_CKS_PIN);

		tfmr =    SSC_BF(TFMR_FSLEN_EXT, fslen_ext)
			| SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_NEGATIVE)
			| SSC_BF(TFMR_FSDEN, 0)
			| SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
			| SSC_BF(TFMR_FSLEN, fslen)
			| SSC_BF(TFMR_DATNB, (channels - 1))
			| SSC_BIT(TFMR_MSBF)
			| SSC_BF(TFMR_DATDEF, 0)
			| SSC_BF(TFMR_DATLEN, (bits - 1));
		break;

	case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBS_CFS:
		/*
                 * DSP/PCM Mode A format, SSC provides BCLK and LRC clocks.
                 *
                 * The SSC transmit and receive clocks are generated from the
                 * MCK divider, and the BCLK signal is output
                 * on the SSC TK line.
                 */
		rcmr =	  SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
			| SSC_BF(RCMR_STTDLY, 1)
			| SSC_BF(RCMR_START, SSC_START_RISING_RF)
			| SSC_BF(RCMR_CKI, SSC_CKI_RISING)
			| SSC_BF(RCMR_CKO, SSC_CKO_NONE)
			| SSC_BF(RCMR_CKS, SSC_CKS_DIV);

		rfmr =	  SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(RFMR_FSOS, SSC_FSOS_POSITIVE)
			| SSC_BF(RFMR_FSLEN, 0)
			| SSC_BF(RFMR_DATNB, (channels - 1))
			| SSC_BIT(RFMR_MSBF)
			| SSC_BF(RFMR_LOOP, 0)
			| SSC_BF(RFMR_DATLEN, (bits - 1));

		tcmr =	  SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
			| SSC_BF(TCMR_STTDLY, 1)
			| SSC_BF(TCMR_START, SSC_START_RISING_RF)
			| SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
			| SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
			| SSC_BF(TCMR_CKS, SSC_CKS_DIV);

		tfmr =	  SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(TFMR_FSDEN, 0)
			| SSC_BF(TFMR_FSOS, SSC_FSOS_POSITIVE)
			| SSC_BF(TFMR_FSLEN, 0)
			| SSC_BF(TFMR_DATNB, (channels - 1))
			| SSC_BIT(TFMR_MSBF)
			| SSC_BF(TFMR_DATDEF, 0)
			| SSC_BF(TFMR_DATLEN, (bits - 1));
		break;

	case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
		/*
                 * DSP/PCM Mode A format, CODEC supplies BCLK and LRC clocks.
                 *
                 * Data is transferred on first BCLK after LRC pulse rising
                 * edge.If stereo, the right channel data is contiguous with
                 * the left channel data.
                 */
		rcmr =	  SSC_BF(RCMR_PERIOD, 0)
			| SSC_BF(RCMR_STTDLY, START_DELAY)
			| SSC_BF(RCMR_START, SSC_START_RISING_RF)
			| SSC_BF(RCMR_CKI, SSC_CKI_RISING)
			| SSC_BF(RCMR_CKO, SSC_CKO_NONE)
			| SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
					   SSC_CKS_PIN : SSC_CKS_CLOCK);

		rfmr =	  SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
			| SSC_BF(RFMR_FSLEN, 0)
			| SSC_BF(RFMR_DATNB, (channels - 1))
			| SSC_BIT(RFMR_MSBF)
			| SSC_BF(RFMR_LOOP, 0)
			| SSC_BF(RFMR_DATLEN, (bits - 1));

		tcmr =	  SSC_BF(TCMR_PERIOD, 0)
			| SSC_BF(TCMR_STTDLY, START_DELAY)
			| SSC_BF(TCMR_START, SSC_START_RISING_RF)
			| SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
			| SSC_BF(TCMR_CKO, SSC_CKO_NONE)
			| SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
					   SSC_CKS_CLOCK : SSC_CKS_PIN);

		tfmr =	  SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(TFMR_FSDEN, 0)
			| SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
			| SSC_BF(TFMR_FSLEN, 0)
			| SSC_BF(TFMR_DATNB, (channels - 1))
			| SSC_BIT(TFMR_MSBF)
			| SSC_BF(TFMR_DATDEF, 0)
			| SSC_BF(TFMR_DATLEN, (bits - 1));
		break;

	default:
		printk(KERN_WARNING "atmel_ssc_dai: unsupported DAI format 0x%x\n",
			ssc_p->daifmt);
		return -EINVAL;
	}
	pr_debug("atmel_ssc_hw_params: "
			"RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n",
			rcmr, rfmr, tcmr, tfmr);

	if (!ssc_p->initialized) {
		if (!ssc_p->ssc->pdata->use_dma) {
			ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0);
			ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0);
			ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0);
			ssc_writel(ssc_p->ssc->regs, PDC_RNCR, 0);

			ssc_writel(ssc_p->ssc->regs, PDC_TPR, 0);
			ssc_writel(ssc_p->ssc->regs, PDC_TCR, 0);
			ssc_writel(ssc_p->ssc->regs, PDC_TNPR, 0);
			ssc_writel(ssc_p->ssc->regs, PDC_TNCR, 0);
		}

		ret = request_irq(ssc_p->ssc->irq, atmel_ssc_interrupt, 0,
				ssc_p->name, ssc_p);
		if (ret < 0) {
			printk(KERN_WARNING
					"atmel_ssc_dai: request_irq failure\n");
			pr_debug("Atmel_ssc_dai: Stoping clock\n");
			clk_disable(ssc_p->ssc->clk);
			return ret;
		}

		ssc_p->initialized = 1;
	}

	/* set SSC clock mode register */
	ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->cmr_div);

	/* set receive clock mode and format */
	ssc_writel(ssc_p->ssc->regs, RCMR, rcmr);
	ssc_writel(ssc_p->ssc->regs, RFMR, rfmr);

	/* set transmit clock mode and format */
	ssc_writel(ssc_p->ssc->regs, TCMR, tcmr);
	ssc_writel(ssc_p->ssc->regs, TFMR, tfmr);

	pr_debug("atmel_ssc_dai,hw_params: SSC initialized\n");
	return 0;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
geoffrey wossum
geoffrey wossum
1065
60.44%
1
7.69%
sedji gaouaou
sedji gaouaou
243
13.79%
1
7.69%
zoltan puskas
zoltan puskas
208
11.80%
1
7.69%
bo shen
bo shen
135
7.66%
6
46.15%
peter rosin
peter rosin
93
5.28%
2
15.38%
songjun wu
songjun wu
13
0.74%
1
7.69%
mark brown
mark brown
5
0.28%
1
7.69%
Total
1762
100.00%
13
100.00%



static int atmel_ssc_prepare(struct snd_pcm_substream *substream,
			     struct snd_soc_dai *dai)
{
	struct platform_device *pdev = to_platform_device(dai->dev);
	struct atmel_ssc_info *ssc_p = &ssc_info[pdev->id];
	struct atmel_pcm_dma_params *dma_params;
	int dir;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dir = 0;
	else
		dir = 1;

	dma_params = ssc_p->dma_params[dir];

	ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
	ssc_writel(ssc_p->ssc->regs, IDR, dma_params->mask->ssc_error);

	pr_debug("%s enabled SSC_SR=0x%08x\n",
			dir ? "receive" : "transmit",
			ssc_readl(ssc_p->ssc->regs, SR));
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
geoffrey wossum
geoffrey wossum
51
38.06%
1
14.29%
sedji gaouaou
sedji gaouaou
47
35.07%
1
14.29%
bo shen
bo shen
18
13.43%
3
42.86%
songjun wu
songjun wu
13
9.70%
1
14.29%
mark brown
mark brown
5
3.73%
1
14.29%
Total
134
100.00%
7
100.00%



static int atmel_ssc_trigger(struct snd_pcm_substream *substream,
			     int cmd, struct snd_soc_dai *dai)
{
	struct platform_device *pdev = to_platform_device(dai->dev);
	struct atmel_ssc_info *ssc_p = &ssc_info[pdev->id];
	struct atmel_pcm_dma_params *dma_params;
	int dir;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dir = 0;
	else
		dir = 1;

	dma_params = ssc_p->dma_params[dir];

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable);
		break;
	default:
		ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
		break;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
bo shen
bo shen
120
90.23%
1
50.00%
songjun wu
songjun wu
13
9.77%
1
50.00%
Total
133
100.00%
2
100.00%

#ifdef CONFIG_PM


static int atmel_ssc_suspend(struct snd_soc_dai *cpu_dai)
{
	struct atmel_ssc_info *ssc_p;
	struct platform_device *pdev = to_platform_device(cpu_dai->dev);

	if (!cpu_dai->active)
		return 0;

	ssc_p = &ssc_info[pdev->id];

	/* Save the status register before disabling transmit and receive */
	ssc_p->ssc_state.ssc_sr = ssc_readl(ssc_p->ssc->regs, SR);
	ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_TXDIS) | SSC_BIT(CR_RXDIS));

	/* Save the current interrupt mask, then disable unmasked interrupts */
	ssc_p->ssc_state.ssc_imr = ssc_readl(ssc_p->ssc->regs, IMR);
	ssc_writel(ssc_p->ssc->regs, IDR, ssc_p->ssc_state.ssc_imr);

	ssc_p->ssc_state.ssc_cmr = ssc_readl(ssc_p->ssc->regs, CMR);
	ssc_p->ssc_state.ssc_rcmr = ssc_readl(ssc_p->ssc->regs, RCMR);
	ssc_p->ssc_state.ssc_rfmr = ssc_readl(ssc_p->ssc->regs, RFMR);
	ssc_p->ssc_state.ssc_tcmr = ssc_readl(ssc_p->ssc->regs, TCMR);
	ssc_p->ssc_state.ssc_tfmr = ssc_readl(ssc_p->ssc->regs, TFMR);

	return 0;
}



Contributors
Person
Tokens
Prop
Commits
CommitProp
geoffrey wossum
geoffrey wossum
194
92.38%
1
25.00%
songjun wu
songjun wu
13
6.19%
1
25.00%
sedji gaouaou
sedji gaouaou
2
0.95%
1
25.00%
liam girdwood
liam girdwood
1
0.48%
1
25.00%
Total
210
100.00%
4
100.00%



static int atmel_ssc_resume(struct snd_soc_dai *cpu_dai)
{
	struct atmel_ssc_info *ssc_p;
	struct platform_device *pdev = to_platform_device(cpu_dai->dev);
	u32 cr;

	if (!cpu_dai->active)
		return 0;

	ssc_p = &ssc_info[pdev->id];

	/* restore SSC register settings */
	ssc_writel(ssc_p->ssc->regs, TFMR, ssc_p->ssc_state.ssc_tfmr);
	ssc_writel(ssc_p->ssc->regs, TCMR, ssc_p->ssc_state.ssc_tcmr);
	ssc_writel(ssc_p->ssc->regs, RFMR, ssc_p->ssc_state.ssc_rfmr);
	ssc_writel(ssc_p->ssc->regs, RCMR, ssc_p->ssc_state.ssc_rcmr);
	ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->ssc_state.ssc_cmr);

	/* re-enable interrupts */
	ssc_writel(ssc_p->ssc->regs, IER, ssc_p->ssc_state.ssc_imr);

	/* Re-enable receive and transmit as appropriate */
	cr = 0;
	cr |=
	    (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_RXEN)) ? SSC_BIT(CR_RXEN) : 0;
	cr |=
	    (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_TXEN)) ? SSC_BIT(CR_TXEN) : 0;
	ssc_writel(ssc_p->ssc->regs, CR, cr);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
geoffrey wossum
geoffrey wossum
203
92.27%
1
20.00%
songjun wu
songjun wu
13
5.91%
1
20.00%
sedji gaouaou
sedji gaouaou
2
0.91%
1
20.00%
liam girdwood
liam girdwood
1
0.45%
1
20.00%
lucas de marchi
lucas de marchi
1
0.45%
1
20.00%
Total
220
100.00%
5
100.00%

#else /* CONFIG_PM */

#  define atmel_ssc_suspend	NULL

#  define atmel_ssc_resume	NULL
#endif /* CONFIG_PM */


#define ATMEL_SSC_FORMATS (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_LE |\
                          SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)


static const struct snd_soc_dai_ops atmel_ssc_dai_ops = {
	.startup	= atmel_ssc_startup,
	.shutdown	= atmel_ssc_shutdown,
	.prepare	= atmel_ssc_prepare,
	.trigger	= atmel_ssc_trigger,
	.hw_params	= atmel_ssc_hw_params,
	.set_fmt	= atmel_ssc_set_dai_fmt,
	.set_clkdiv	= atmel_ssc_set_dai_clkdiv,
};


static struct snd_soc_dai_driver atmel_ssc_dai = {
		.suspend = atmel_ssc_suspend,
		.resume = atmel_ssc_resume,
		.playback = {
			.channels_min = 1,
			.channels_max = 2,
			.rates = SNDRV_PCM_RATE_CONTINUOUS,
			.rate_min = 8000,
			.rate_max = 384000,
			.formats = ATMEL_SSC_FORMATS,},
		.capture = {
			.channels_min = 1,
			.channels_max = 2,
			.rates = SNDRV_PCM_RATE_CONTINUOUS,
			.rate_min = 8000,
			.rate_max = 384000,
			.formats = ATMEL_SSC_FORMATS,},
		.ops = &atmel_ssc_dai_ops,
};


static const struct snd_soc_component_driver atmel_ssc_component = {
	.name		= "atmel-ssc",
};



static int asoc_ssc_init(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct ssc_device *ssc = platform_get_drvdata(pdev);
	int ret;

	ret = snd_soc_register_component(dev, &atmel_ssc_component,
					 &atmel_ssc_dai, 1);
	if (ret) {
		dev_err(dev, "Could not register DAI: %d\n", ret);
		goto err;
	}

	if (ssc->pdata->use_dma)
		ret = atmel_pcm_dma_platform_register(dev);
	else
		ret = atmel_pcm_pdc_platform_register(dev);

	if (ret) {
		dev_err(dev, "Could not register PCM: %d\n", ret);
		goto err_unregister_dai;
	}

	return 0;

err_unregister_dai:
	snd_soc_unregister_component(dev);
err:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
bo shen
bo shen
99
80.49%
3
33.33%
mark brown
mark brown
8
6.50%
2
22.22%
kuninori morimoto
kuninori morimoto
7
5.69%
1
11.11%
geoffrey wossum
geoffrey wossum
4
3.25%
1
11.11%
liam girdwood
liam girdwood
4
3.25%
1
11.11%
eric miao
eric miao
1
0.81%
1
11.11%
Total
123
100.00%
9
100.00%



static void asoc_ssc_exit(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct ssc_device *ssc = platform_get_drvdata(pdev);

	if (ssc->pdata->use_dma)
		atmel_pcm_dma_platform_unregister(dev);
	else
		atmel_pcm_pdc_platform_unregister(dev);

	snd_soc_unregister_component(dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
bo shen
bo shen
43
78.18%
3
50.00%
liam girdwood
liam girdwood
10
18.18%
1
16.67%
mark brown
mark brown
1
1.82%
1
16.67%
kuninori morimoto
kuninori morimoto
1
1.82%
1
16.67%
Total
55
100.00%
6
100.00%

/**
 * atmel_ssc_set_audio - Allocate the specified SSC for audio use.
 */


int atmel_ssc_set_audio(int ssc_id)
{
	struct ssc_device *ssc;
	int ret;

	/* If we can grab the SSC briefly to parent the DAI device off it */
	ssc = ssc_request(ssc_id);
	if (IS_ERR(ssc)) {
		pr_err("Unable to parent ASoC SSC DAI on SSC: %ld\n",
			PTR_ERR(ssc));
		return PTR_ERR(ssc);
	} else {
		ssc_info[ssc_id].ssc = ssc;
	}

	ret = asoc_ssc_init(&ssc->pdev->dev);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
mark brown
mark brown
53
69.74%
1
33.33%
bo shen
bo shen
21
27.63%
1
33.33%
joachim eastwood
joachim eastwood
2
2.63%
1
33.33%
Total
76
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(atmel_ssc_set_audio);



void atmel_ssc_put_audio(int ssc_id)
{
	struct ssc_device *ssc = ssc_info[ssc_id].ssc;

	asoc_ssc_exit(&ssc->pdev->dev);
	ssc_free(ssc);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
bo shen
bo shen
35
100.00%
2
100.00%
Total
35
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(atmel_ssc_put_audio);

/* Module information */
MODULE_AUTHOR("Sedji Gaouaou, sedji.gaouaou@atmel.com, www.atmel.com");
MODULE_DESCRIPTION("ATMEL SSC ASoC Interface");
MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
geoffrey wossum
geoffrey wossum
2498
55.11%
1
2.78%
bo shen
bo shen
609
13.43%
16
44.44%
peter rosin
peter rosin
497
10.96%
4
11.11%
sedji gaouaou
sedji gaouaou
426
9.40%
1
2.78%
zoltan puskas
zoltan puskas
208
4.59%
1
2.78%
songjun wu
songjun wu
117
2.58%
1
2.78%
mark brown
mark brown
91
2.01%
3
8.33%
eric miao
eric miao
40
0.88%
1
2.78%
kuninori morimoto
kuninori morimoto
21
0.46%
1
2.78%
liam girdwood
liam girdwood
21
0.46%
3
8.33%
joachim eastwood
joachim eastwood
2
0.04%
1
2.78%
lars-peter clausen
lars-peter clausen
1
0.02%
1
2.78%
joe perches
joe perches
1
0.02%
1
2.78%
lucas de marchi
lucas de marchi
1
0.02%
1
2.78%
Total
4533
100.00%
36
100.00%
  
Directory: sound/soc/atmel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.