ASoC: atmel: Add slave mode support to SSC in DSP Mode A

Add previously unsupported slave mode to the SSC peripheral when using
DSP/PCM Mode A format on the Atmel ARM platform.

Signed-off-by: Zoltan Puskas <zpuskas@dension.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c
index e13580d6c476..94da62345a27 100644
--- a/sound/soc/atmel/atmel_ssc_dai.c
+++ b/sound/soc/atmel/atmel_ssc_dai.c
@@ -533,6 +533,49 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
                 break;
 
         case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
+                /*
+                 * DSP/PCM Mode A 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.
+                 *
+                 * 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_CKS_PIN);
+
+                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(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, (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);