ASoC: qcom: apq8016: add wrdma support

This patch adds wrdma support in lpass-apq8016 by providing the register
offsets and adding support in dma channel allocation callback.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: Kenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/qcom/lpass-apq8016.c

@@ -137,11 +137,23 @@ static int apq8016_lpass_alloc_dma_channel(struct lpass_data *drvdata,
 					   int direction)
 {
 	struct lpass_variant *v = drvdata->variant;
-	int chan = find_first_zero_bit(&drvdata->dma_ch_bit_map,
+	int chan = 0;
+
+	if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
+		chan = find_first_zero_bit(&drvdata->dma_ch_bit_map,
 					v->rdma_channels);
 
-	if (chan >= v->rdma_channels)
-		return -EBUSY;
+		if (chan >= v->rdma_channels)
+			return -EBUSY;
+	} else {
+		chan = find_next_zero_bit(&drvdata->dma_ch_bit_map,
+					v->wrdma_channel_start +
+					v->wrdma_channels,
+					v->wrdma_channel_start);
+
+		if (chan >=  v->wrdma_channel_start + v->wrdma_channels)
+			return -EBUSY;
+	}
 
 	set_bit(chan, &drvdata->dma_ch_bit_map);
 
@@ -214,6 +226,10 @@ static struct lpass_variant apq8016_data = {
 	.rdma_reg_stride	= 0x1000,
 	.rdma_channels		= 2,
 	.dmactl_audif_start	= 1,
+	.wrdma_reg_base		= 0xB000,
+	.wrdma_reg_stride	= 0x1000,
+	.wrdma_channel_start	= 5,
+	.wrdma_channels		= 2,
 	.dai_driver		= apq8016_lpass_cpu_dai_driver,
 	.num_dai		= ARRAY_SIZE(apq8016_lpass_cpu_dai_driver),
 	.init			= apq8016_lpass_init,