ASoC: Add files in the new sound/soc/atmel directory to manage the DAI ssc for all atmel boards.

3/7

sound/soc/atmel/atmel_ssc_dai.c |  782 +++++++++++++++++++++++++++++++++++++++
sound/soc/atmel/atmel_ssc_dai.h |  121 ++++++
2 files changed, 903 insertions(+), 0 deletions(-)
new file mode 100644
index 0000000..df02f2b
@@ -0,0 +1,782 @@
+/*
+ * atmel_ssc_dai.c  --  ALSA SoC ATMEL SSC Audio Layer Platform driver
+ *
+ * Copyright (C) 2005 SAN People
+ * Copyright (C) 2008 Atmel
+ *
+ * Author: Sedji Gaouaou <[email protected]>
+ *         ATMEL CORP.
+ *
+ * Based on at91-ssc.c by
+ * Frank Mandarino <[email protected]>
+ * Based on pxa2xx Platform drivers by
+ * Liam Girdwood <[email protected]>
+ *
+ * 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 <mach/hardware.h>
+
+#include "atmel-pcm.h"
+#include "atmel_ssc_dai.h"
+
+
+#if defined(CONFIG_ARCH_AT91SAM9260) || defined(CONFIG_ARCH_AT91SAM9G20)
+#define NUM_SSC_DEVICES		1
+#else
+#define NUM_SSC_DEVICES		3
+#endif
+
+/*
+ * 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),
+	.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),
+	.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,
+	} },
+#if NUM_SSC_DEVICES == 3
+	{{
+	.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,
+	} },
+#endif
+};
+
+
+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,
+	},
+#if NUM_SSC_DEVICES == 3
+	{
+	.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,
+	},
+#endif
+};
+
+
+/*
+ * 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;
+}
+
+
+/*-------------------------------------------------------------------------*\
+ * DAI functions
+\*-------------------------------------------------------------------------*/
+/*
+ * Startup.  Only that one substream allowed in each direction.
+ */
+static int atmel_ssc_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
+	struct atmel_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
+	int dir_mask;
+
+	pr_debug("atmel_ssc_startup: SSC_SR=0x%u\n",
+		ssc_readl(ssc_p->ssc->regs, SR));
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		dir_mask = SSC_DIR_MASK_PLAYBACK;
+	else
+		dir_mask = SSC_DIR_MASK_CAPTURE;
+
+	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;
+}
+
+/*
+ * 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_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
+	struct atmel_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->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) {
+		ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
+		pr_debug("atmel_ssc_shutdown: %s disabled SSC_SR=0x%08x\n",
+			(dir ? "receive" : "transmit"),
+			ssc_readl(ssc_p->ssc->regs, SR));
+
+		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) {
+		/* Shutdown the SSC clock. */
+		pr_debug("atmel_ssc_dau: Stopping clock\n");
+		clk_disable(ssc_p->ssc->clk);
+
+		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);
+}
+
+
+/*
+ * 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 atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
+
+	ssc_p->daifmt = fmt;
+	return 0;
+}
+
+/*
+ * 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 atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->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->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;
+}
+
+/*
+ * Configure the SSC.
+ */
+static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
+	int id = rtd->dai->cpu_dai->id;
+	struct atmel_ssc_info *ssc_p = &ssc_info[id];
+	struct atmel_pcm_dma_params *dma_params;
+	int dir, channels, bits;
+	u32 tfmr, rfmr, tcmr, rcmr;
+	int start_event;
+	int ret;
+
+	/*
+	 * 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_dma_params[id][dir];
+	dma_params->ssc = ssc_p->ssc;
+	dma_params->substream = substream;
+
+	ssc_p->dma_params[dir] = dma_params;
+
+	/*
+	 * The cpu_dai->dma_data field is only used to communicate the
+	 * appropriate DMA parameters to the pcm driver hw_params()
+	 * function.  It should not be used for other purposes
+	 * as it is common to all substreams.
+	 */
+	rtd->dai->cpu_dai->dma_data = dma_params;
+
+	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;
+	}
+
+	/*
+	 * The SSC only supports up to 16-bit samples in I2S format, due
+	 * to the size of the Frame Mode Register FSLEN field.
+	 */
+	if ((ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S
+		&& bits > 16) {
+		printk(KERN_WARNING
+				"atmel_ssc_dai: sample size %d"
+				"is too large for I2S\n", bits);
+		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.
+		 */
+		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_FSEDGE, SSC_FSEDGE_POSITIVE)
+			| SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
+			| SSC_BF(RFMR_FSLEN, (bits - 1))
+			| 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_FSEDGE, SSC_FSEDGE_POSITIVE)
+			| SSC_BF(TFMR_FSDEN, 0)
+			| SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
+			| SSC_BF(TFMR_FSLEN, (bits - 1))
+			| 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.
+		 *
+		 * The SSC transmit clock is obtained from the BCLK signal on
+		 * on the TK line, and the SSC receive clock is
+		 * generated from the transmit clock.
+		 *
+		 *  For single channel data, one sample is transferred
+		 * on the falling edge of the LRC clock.
+		 * For two channel data, one sample is
+		 * transferred on both edges of the LRC clock.
+		 */
+		start_event = ((channels == 1)
+				? SSC_START_FALLING_RF
+				: SSC_START_EDGE_RF);
+
+		rcmr =	  SSC_BF(RCMR_PERIOD, 0)
+			| SSC_BF(RCMR_STTDLY, START_DELAY)
+			| SSC_BF(RCMR_START, start_event)
+			| SSC_BF(RCMR_CKI, SSC_CKI_RISING)
+			| SSC_BF(RCMR_CKO, SSC_CKO_NONE)
+			| SSC_BF(RCMR_CKS, 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, 0)
+			| 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, start_event)
+			| SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
+			| SSC_BF(TCMR_CKO, SSC_CKO_NONE)
+			| SSC_BF(TCMR_CKS, 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, 0)
+			| 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_RISING)
+			| 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:
+	default:
+		printk(KERN_WARNING "atmel_ssc_dai: unsupported DAI format 0x%x\n",
+			ssc_p->daifmt);
+		return -EINVAL;
+		break;
+	}
+	pr_debug("atmel_ssc_hw_params: "
+			"RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n",
+			rcmr, rfmr, tcmr, tfmr);
+
+	if (!ssc_p->initialized) {
+
+		/* Enable PMC peripheral clock for this SSC */
+		pr_debug("atmel_ssc_dai: Starting clock\n");
+		clk_enable(ssc_p->ssc->clk);
+
+		/* Reset the SSC and its PDC registers */
+		ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
+
+		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;
+}
+
+
+static int atmel_ssc_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
+	struct atmel_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->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_enable);
+
+	pr_debug("%s enabled SSC_SR=0x%08x\n",
+			dir ? "receive" : "transmit",
+			ssc_readl(ssc_p->ssc->regs, SR));
+	return 0;
+}
+
+
+#ifdef CONFIG_PM
+static int atmel_ssc_suspend(struct platform_device *pdev,
+			    struct snd_soc_dai *cpu_dai)
+{
+	struct atmel_ssc_info *ssc_p;
+
+	if (!cpu_dai->active)
+		return 0;
+
+	ssc_p = &ssc_info[cpu_dai->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;
+}
+
+
+
+static int atmel_ssc_resume(struct platform_device *pdev,
+			   struct snd_soc_dai *cpu_dai)
+{
+	struct atmel_ssc_info *ssc_p;
+	u32 cr;
+
+	if (!cpu_dai->active)
+		return 0;
+
+	ssc_p = &ssc_info[cpu_dai->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 recieve 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;
+}
+#else /* CONFIG_PM */
+#  define atmel_ssc_suspend	NULL
+#  define atmel_ssc_resume	NULL
+#endif /* CONFIG_PM */
+
+
+#define ATMEL_SSC_RATES (SNDRV_PCM_RATE_8000_96000)
+
+#define ATMEL_SSC_FORMATS (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_LE |\
+			  SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+struct snd_soc_dai atmel_ssc_dai[NUM_SSC_DEVICES] = {
+	{	.name = "atmel-ssc0",
+		.id = 0,
+		.type = SND_SOC_DAI_PCM,
+		.suspend = atmel_ssc_suspend,
+		.resume = atmel_ssc_resume,
+		.playback = {
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = ATMEL_SSC_RATES,
+			.formats = ATMEL_SSC_FORMATS,},
+		.capture = {
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = ATMEL_SSC_RATES,
+			.formats = ATMEL_SSC_FORMATS,},
+		.ops = {
+			.startup = atmel_ssc_startup,
+			.shutdown = atmel_ssc_shutdown,
+			.prepare = atmel_ssc_prepare,
+			.hw_params = atmel_ssc_hw_params,},
+		.dai_ops = {
+			.set_fmt = atmel_ssc_set_dai_fmt,
+			.set_clkdiv = atmel_ssc_set_dai_clkdiv,},
+		.private_data = &ssc_info[0],
+	},
+#if NUM_SSC_DEVICES == 3
+	{	.name = "atmel-ssc1",
+		.id = 1,
+		.type = SND_SOC_DAI_PCM,
+		.suspend = atmel_ssc_suspend,
+		.resume = atmel_ssc_resume,
+		.playback = {
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = ATMEL_SSC_RATES,
+			.formats = ATMEL_SSC_FORMATS,},
+		.capture = {
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = ATMEL_SSC_RATES,
+			.formats = ATMEL_SSC_FORMATS,},
+		.ops = {
+			.startup = atmel_ssc_startup,
+			.shutdown = atmel_ssc_shutdown,
+			.prepare = atmel_ssc_prepare,
+			.hw_params = atmel_ssc_hw_params,},
+		.dai_ops = {
+			.set_fmt = atmel_ssc_set_dai_fmt,
+			.set_clkdiv = atmel_ssc_set_dai_clkdiv,},
+		.private_data = &ssc_info[1],
+	},
+	{	.name = "atmel-ssc2",
+		.id = 2,
+		.type = SND_SOC_DAI_PCM,
+		.suspend = atmel_ssc_suspend,
+		.resume = atmel_ssc_resume,
+		.playback = {
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = ATMEL_SSC_RATES,
+			.formats = ATMEL_SSC_FORMATS,},
+		.capture = {
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = ATMEL_SSC_RATES,
+			.formats = ATMEL_SSC_FORMATS,},
+		.ops = {
+			.startup = atmel_ssc_startup,
+			.shutdown = atmel_ssc_shutdown,
+			.prepare = atmel_ssc_prepare,
+			.hw_params = atmel_ssc_hw_params,},
+		.dai_ops = {
+			.set_fmt = atmel_ssc_set_dai_fmt,
+			.set_clkdiv = atmel_ssc_set_dai_clkdiv,},
+		.private_data = &ssc_info[2],
+	},
+#endif
+};
+EXPORT_SYMBOL_GPL(atmel_ssc_dai);
+
+/* Module information */
+MODULE_AUTHOR("Sedji Gaouaou, [email protected], www.atmel.com");
+MODULE_DESCRIPTION("ATMEL SSC ASoC Interface");
+MODULE_LICENSE("GPL");

1.5.3.7
---
 sound/soc/atmel/atmel_ssc_dai.c |  782 +++++++++++++++++++++++++++++++++++++++
 sound/soc/atmel/atmel_ssc_dai.h |  121 ++++++
 2 files changed, 903 insertions(+), 0 deletions(-)
 create mode 100644 sound/soc/atmel/atmel_ssc_dai.c
 create mode 100644 sound/soc/atmel/atmel_ssc_dai.h
1.5.3.7