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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>
hifive-unleashed-5.1
Moise Gergaud 2016-04-07 11:25:33 +02:00 committed by Mark Brown
parent 9a00a3e9fe
commit 44f948bdb1
2 changed files with 113 additions and 0 deletions
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90
sound/soc/sti/sti_uniperif.c
View File

@ -10,6 +10,96 @@
#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.

23
sound/soc/sti/uniperif.h
View File

@ -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