ASoC: sh: FSI: Add capture support

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 86 insertions, 7 deletions

diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index 9742a280ba15..e1a3d1a2b4c8 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -447,6 +447,75 @@ static int fsi_data_push(struct fsi_priv *fsi)
         return 0;
 }
 
+static int fsi_data_pop(struct fsi_priv *fsi)
+{
+        struct snd_pcm_runtime *runtime;
+        struct snd_pcm_substream *substream = NULL;
+        int free;
+        int fifo_fill;
+        int width;
+        u8 *start;
+        int i;
+
+        if (!fsi                        ||
+            !fsi->substream             ||
+            !fsi->substream->runtime)
+                return -EINVAL;
+
+        runtime = fsi->substream->runtime;
+
+        /* FSI FIFO has limit.
+         * So, this driver can not send periods data at a time
+         */
+        if (fsi->byte_offset >=
+            fsi->period_len * (fsi->periods + 1)) {
+
+                substream = fsi->substream;
+                fsi->periods = (fsi->periods + 1) % runtime->periods;
+
+                if (0 == fsi->periods)
+                        fsi->byte_offset = 0;
+        }
+
+        /* get 1 channel data width */
+        width = frames_to_bytes(runtime, 1) / fsi->chan;
+
+        /* get free space for alsa */
+        free = (fsi->buffer_len - fsi->byte_offset) / width;
+
+        /* get recv size */
+        fifo_fill = fsi_get_fifo_residue(fsi, 0);
+
+        if (free < fifo_fill)
+                fifo_fill = free;
+
+        start = runtime->dma_area;
+        start += fsi->byte_offset;
+
+        switch (width) {
+        case 2:
+                for (i = 0; i < fifo_fill; i++)
+                        *((u16 *)start + i) =
+                                (u16)(fsi_reg_read(fsi, DIDT) >> 8);
+                break;
+        case 4:
+                for (i = 0; i < fifo_fill; i++)
+                        *((u32 *)start + i) = fsi_reg_read(fsi, DIDT);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        fsi->byte_offset += fifo_fill * width;
+
+        fsi_irq_enable(fsi, 0);
+
+        if (substream)
+                snd_pcm_period_elapsed(substream);
+
+        return 0;
+}
+
 static irqreturn_t fsi_interrupt(int irq, void *data)
 {
         u32 status = fsi_master_read(SOFT_RST) & ~0x00000010;
@@ -460,6 +529,10 @@ static irqreturn_t fsi_interrupt(int irq, void *data)
                 fsi_data_push(&master->fsia);
         if (int_st & INT_B_OUT)
                 fsi_data_push(&master->fsib);
+        if (int_st & INT_A_IN)
+                fsi_data_pop(&master->fsia);
+        if (int_st & INT_B_IN)
+                fsi_data_pop(&master->fsib);
 
         fsi_master_write(INT_ST, 0x0000000);
 
@@ -612,16 +685,12 @@ static int fsi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
         int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
         int ret = 0;
 
-        /* capture not supported */
-        if (!is_play)
-                return -ENODEV;
-
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
                 fsi_stream_push(fsi, substream,
                                 frames_to_bytes(runtime, runtime->buffer_size),
                                 frames_to_bytes(runtime, runtime->period_size));
-                ret = fsi_data_push(fsi);
+                ret = is_play ? fsi_data_push(fsi) : fsi_data_pop(fsi);
                 break;
         case SNDRV_PCM_TRIGGER_STOP:
                 fsi_irq_disable(fsi, is_play);
@@ -757,7 +826,12 @@ struct snd_soc_dai fsi_soc_dai[] = {
                         .channels_min   = 1,
                         .channels_max   = 8,
                 },
-                /* capture not supported */
+                .capture = {
+                        .rates          = FSI_RATES,
+                        .formats        = FSI_FMTS,
+                        .channels_min   = 1,
+                        .channels_max   = 8,
+                },
                 .ops = &fsi_dai_ops,
         },
         {
@@ -769,7 +843,12 @@ struct snd_soc_dai fsi_soc_dai[] = {
                         .channels_min   = 1,
                         .channels_max   = 8,
                 },
-                /* capture not supported */
+                .capture = {
+                        .rates          = FSI_RATES,
+                        .formats        = FSI_FMTS,
+                        .channels_min   = 1,
+                        .channels_max   = 8,
+                },
                 .ops = &fsi_dai_ops,
         },
 };