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authorMoise Gergaud <moise.gergaud@st.com>2016-04-07 11:25:33 +0200
committerMark Brown <broonie@kernel.org>2016-04-12 04:59:09 +0100
commit44f948bdb175bf326911c9ba0e47389918161ce5 (patch)
tree7725979f1693b1d1f33aada15f63571c9a8ba4ba /sound
parent9a00a3e9fea1ea5affa7bea971299d3a5832daad (diff)
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ASoC: sti: helper functions for unip tdm slots configuration
- sti_uniperiph_set_tdm_slot: store tdm slot config in unip context - sti_uniperiph_get_tdm_word_pos: configure unip tdm slots pos regs Signed-off-by: Moise Gergaud <moise.gergaud@st.com> Acked-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/sti/sti_uniperif.c90
-rw-r--r--sound/soc/sti/uniperif.h23
2 files changed, 113 insertions, 0 deletions
diff --git a/sound/soc/sti/sti_uniperif.c b/sound/soc/sti/sti_uniperif.c
index 39bcefe5eea0..0c2474c16c11 100644
--- a/sound/soc/sti/sti_uniperif.c
+++ b/sound/soc/sti/sti_uniperif.c
@@ -11,6 +11,96 @@
#include "uniperif.h"
/*
+ * User frame size shall be 2, 4, 6 or 8 32-bits words length
+ * (i.e. 8, 16, 24 or 32 bytes)
+ * This constraint comes from allowed values for
+ * UNIPERIF_I2S_FMT_NUM_CH register
+ */
+#define UNIPERIF_MAX_FRAME_SZ 0x20
+#define UNIPERIF_ALLOWED_FRAME_SZ (0x08 | 0x10 | 0x18 | UNIPERIF_MAX_FRAME_SZ)
+
+int sti_uniperiph_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
+ unsigned int rx_mask, int slots,
+ int slot_width)
+{
+ struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
+ struct uniperif *uni = priv->dai_data.uni;
+ int i, frame_size, avail_slots;
+
+ if (!UNIPERIF_TYPE_IS_TDM(uni)) {
+ dev_err(uni->dev, "cpu dai not in tdm mode\n");
+ return -EINVAL;
+ }
+
+ /* store info in unip context */
+ uni->tdm_slot.slots = slots;
+ uni->tdm_slot.slot_width = slot_width;
+ /* unip is unidirectionnal */
+ uni->tdm_slot.mask = (tx_mask != 0) ? tx_mask : rx_mask;
+
+ /* number of available timeslots */
+ for (i = 0, avail_slots = 0; i < uni->tdm_slot.slots; i++) {
+ if ((uni->tdm_slot.mask >> i) & 0x01)
+ avail_slots++;
+ }
+ uni->tdm_slot.avail_slots = avail_slots;
+
+ /* frame size in bytes */
+ frame_size = uni->tdm_slot.avail_slots * uni->tdm_slot.slot_width / 8;
+
+ /* check frame size is allowed */
+ if ((frame_size > UNIPERIF_MAX_FRAME_SZ) ||
+ (frame_size & ~(int)UNIPERIF_ALLOWED_FRAME_SZ)) {
+ dev_err(uni->dev, "frame size not allowed: %d bytes\n",
+ frame_size);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int sti_uniperiph_get_tdm_word_pos(struct uniperif *uni,
+ unsigned int *word_pos)
+{
+ int slot_width = uni->tdm_slot.slot_width / 8;
+ int slots_num = uni->tdm_slot.slots;
+ unsigned int slots_mask = uni->tdm_slot.mask;
+ int i, j, k;
+ unsigned int word16_pos[4];
+
+ /* word16_pos:
+ * word16_pos[0] = WORDX_LSB
+ * word16_pos[1] = WORDX_MSB,
+ * word16_pos[2] = WORDX+1_LSB
+ * word16_pos[3] = WORDX+1_MSB
+ */
+
+ /* set unip word position */
+ for (i = 0, j = 0, k = 0; (i < slots_num) && (k < WORD_MAX); i++) {
+ if ((slots_mask >> i) & 0x01) {
+ word16_pos[j] = i * slot_width;
+
+ if (slot_width == 4) {
+ word16_pos[j + 1] = word16_pos[j] + 2;
+ j++;
+ }
+ j++;
+
+ if (j > 3) {
+ word_pos[k] = word16_pos[1] |
+ (word16_pos[0] << 8) |
+ (word16_pos[3] << 16) |
+ (word16_pos[2] << 24);
+ j = 0;
+ k++;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/*
* sti_uniperiph_dai_create_ctrl
* This function is used to create Ctrl associated to DAI but also pcm device.
* Request is done by front end to associate ctrl with pcm device id
diff --git a/sound/soc/sti/uniperif.h b/sound/soc/sti/uniperif.h
index 750eb5a07e6c..fb8e427754b6 100644
--- a/sound/soc/sti/uniperif.h
+++ b/sound/soc/sti/uniperif.h
@@ -1270,6 +1270,14 @@ enum uniperif_iec958_encoding_mode {
UNIPERIF_IEC958_ENCODING_MODE_ENCODED
};
+enum uniperif_word_pos {
+ WORD_1_2,
+ WORD_3_4,
+ WORD_5_6,
+ WORD_7_8,
+ WORD_MAX
+};
+
struct uniperif_info {
int id; /* instance value of the uniperipheral IP */
enum uniperif_type type;
@@ -1281,6 +1289,13 @@ struct uniperif_iec958_settings {
struct snd_aes_iec958 iec958;
};
+struct dai_tdm_slot {
+ unsigned int mask;
+ int slots;
+ int slot_width;
+ unsigned int avail_slots;
+};
+
struct uniperif {
/* System information */
struct uniperif_info *info;
@@ -1317,6 +1332,7 @@ struct uniperif {
/* dai properties */
unsigned int daifmt;
+ struct dai_tdm_slot tdm_slot;
/* DAI callbacks */
const struct snd_soc_dai_ops *dai_ops;
@@ -1373,4 +1389,11 @@ int sti_uniperiph_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai);
+int sti_uniperiph_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
+ unsigned int rx_mask, int slots,
+ int slot_width);
+
+int sti_uniperiph_get_tdm_word_pos(struct uniperif *uni,
+ unsigned int *word_pos);
+
#endif