[alsa-devel] [PATCH 5/9] ASoC: ipq806x: Add I2S PCM platform driver
Kenneth Westfield
kwestfie at codeaurora.org
Wed Nov 19 19:52:45 CET 2014
From: Kenneth Westfield <kwestfie at codeaurora.org>
Add PCM platform driver for the LPASS I2S port.
Change-Id: If6516fb615b16551817fd9248c1c704fe521fb32
Signed-off-by: Kenneth Westfield <kwestfie at codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami at codeaurora.org>
---
sound/soc/qcom/lpass-pcm-mi2s.c | 390 ++++++++++++++++++++++++++++++++++++++++
sound/soc/qcom/lpass-pcm-mi2s.h | 40 +++++
2 files changed, 430 insertions(+)
create mode 100644 sound/soc/qcom/lpass-pcm-mi2s.c
create mode 100644 sound/soc/qcom/lpass-pcm-mi2s.h
diff --git a/sound/soc/qcom/lpass-pcm-mi2s.c b/sound/soc/qcom/lpass-pcm-mi2s.c
new file mode 100644
index 0000000000000000000000000000000000000000..110b088d156c6d06cbe054920fc63fd064a0ac45
--- /dev/null
+++ b/sound/soc/qcom/lpass-pcm-mi2s.c
@@ -0,0 +1,390 @@
+/*
+ * Copyright (c) 2010-2011,2013-2014 The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <sound/soc.h>
+#include "lpass-lpaif.h"
+#include "lpass-pcm-mi2s.h"
+
+#define DRV_NAME "lpass-pcm-mi2s"
+#define DRV_VERSION "1.0"
+
+/* MI2S Hw params */
+#define LPASS_MI2S_NO_OF_PERIODS (65)
+#define LPASS_MI2S_PERIOD_BYTES_MIN (8064)
+#define LPASS_MI2S_BUFF_SIZE (LPASS_MI2S_PERIOD_BYTES_MIN * \
+ LPASS_MI2S_NO_OF_PERIODS)
+
+static struct snd_pcm_hardware lpass_pcm_hardware_playback = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_PAUSE |
+ SNDRV_PCM_INFO_RESUME,
+ .formats = SNDRV_PCM_FMTBIT_S16 |
+ SNDRV_PCM_FMTBIT_S24 |
+ SNDRV_PCM_FMTBIT_S32,
+ .rates = SNDRV_PCM_RATE_8000_192000,
+ .rate_min = 8000,
+ .rate_max = 192000,
+ .channels_min = 2,
+ .channels_max = 8,
+ .buffer_bytes_max = LPASS_MI2S_BUFF_SIZE,
+ .period_bytes_max = (LPASS_MI2S_BUFF_SIZE) / 2,
+ .period_bytes_min = LPASS_MI2S_PERIOD_BYTES_MIN,
+ .periods_min = LPASS_MI2S_NO_OF_PERIODS,
+ .periods_max = LPASS_MI2S_NO_OF_PERIODS,
+ .fifo_size = 0,
+};
+
+static int lpass_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+ struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+ size_t size;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ size = lpass_pcm_hardware_playback.buffer_bytes_max;
+ } else {
+ pr_err("%s: Invalid stream direction\n", __func__);
+ return -EINVAL;
+ }
+
+ buf->dev.type = SNDRV_DMA_TYPE_DEV;
+ buf->dev.dev = pcm->card->dev;
+ buf->private_data = NULL;
+ buf->area = dma_alloc_coherent(pcm->card->dev, size,
+ &buf->addr, GFP_KERNEL);
+ if (!buf->area) {
+ pr_err("%s: Could not allocate DMA buffer\n", __func__);
+ return -ENOMEM;
+ }
+ buf->bytes = size;
+
+ return 0;
+}
+
+static void lpass_pcm_free_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+ struct snd_pcm_substream *substream;
+ struct snd_dma_buffer *buf;
+
+ substream = pcm->streams[stream].substream;
+ buf = &substream->dma_buffer;
+ if (buf->area) {
+ dma_free_coherent(pcm->card->dev, buf->bytes,
+ buf->area, buf->addr);
+ }
+ buf->area = NULL;
+}
+
+static irqreturn_t lpass_pcm_mi2s_irq(int intrsrc, void *data)
+{
+ int dma_ch;
+ uint32_t ret = IRQ_NONE;
+ uint32_t has_xrun, pending;
+
+ struct snd_pcm_substream *substream = data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct lpass_runtime_data_t *prtd = runtime->private_data;
+
+ if (prtd) {
+ dma_ch = prtd->lpaif_info.dma_ch;
+ } else {
+ pr_debug("%s: received interrupt w/o runtime\n", __func__);
+ return IRQ_NONE;
+ }
+
+ pending = intrsrc & (LPAIF_UNDER_CH(dma_ch) | LPAIF_PER_CH(dma_ch) |
+ LPAIF_ERR_CH(dma_ch));
+
+ has_xrun = pending & LPAIF_UNDER_CH(dma_ch);
+
+ if (unlikely(has_xrun) && substream->runtime &&
+ snd_pcm_running(substream)) {
+ pr_debug("%s: xrun warning\n", __func__);
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ pending &= ~LPAIF_UNDER_CH(dma_ch);
+ ret = IRQ_HANDLED;
+ }
+
+ if (pending & LPAIF_PER_CH(dma_ch)) {
+ if (++prtd->pcm_stream_info.period_index >= runtime->periods)
+ prtd->pcm_stream_info.period_index = 0;
+ snd_pcm_period_elapsed(substream);
+ pending &= ~LPAIF_PER_CH(dma_ch);
+ ret = IRQ_HANDLED;
+ }
+
+ if (pending & LPAIF_UNDER_CH(dma_ch)) {
+ snd_pcm_period_elapsed(substream);
+ pr_debug("%s: xrun warning\n", __func__);
+ ret = IRQ_HANDLED;
+ }
+
+ if (pending & LPAIF_ERR_CH(dma_ch)) {
+ pr_debug("%s: Bus access warning\n", __func__);
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+}
+
+static snd_pcm_uframes_t lpass_pcm_mi2s_pointer(
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct lpass_runtime_data_t *prtd = runtime->private_data;
+ snd_pcm_uframes_t offset;
+
+ offset = prtd->pcm_stream_info.period_index * runtime->period_size;
+
+ return offset >= (runtime->buffer_size) ? 0 : offset;
+}
+
+static int lpass_pcm_mi2s_mmap(struct snd_pcm_substream *substream,
+ struct vm_area_struct *vma)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ return dma_mmap_coherent(substream->pcm->card->dev, vma,
+ runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
+}
+
+static int lpass_pcm_mi2s_prepare(struct snd_pcm_substream *substream)
+{
+ int ret;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct lpaif_dai_dma_params dma_params;
+ struct lpass_runtime_data_t *prtd = runtime->private_data;
+
+ if (!prtd) {
+ pr_err("%s: Error in getting runtime data\n", __func__);
+ return -EINVAL;
+ }
+
+ /*
+ * This is the case for under\over-run, we have already
+ * configured the DMA registers for this stream
+ */
+ if (prtd->pcm_stream_info.pcm_prepare_start)
+ return 0;
+
+ lpaif_dma_stop(prtd->lpaif_info.dma_ch);
+ prtd->pcm_stream_info.pcm_prepare_start = 1;
+ prtd->lpaif_info.lpa_if_dma_start = 0;
+
+ memset(&dma_params, 0, sizeof(dma_params));
+ dma_params.src_start = runtime->dma_addr;
+ dma_params.buffer_size = snd_pcm_lib_buffer_bytes(substream);
+ dma_params.period_size = snd_pcm_lib_period_bytes(substream);
+ dma_params.channels = runtime->channels;
+ ret = lpaif_cfg_dma(prtd->lpaif_info.dma_ch, &dma_params,
+ prtd->pcm_stream_info.bit_width,
+ 1 /*enable intr*/);
+ if (ret) {
+ pr_err("%s: Error in configuring DMA\n", __func__);
+ return -EINVAL;
+ }
+
+ lpaif_register_dma_irq_handler(prtd->lpaif_info.dma_ch,
+ lpass_pcm_mi2s_irq, substream);
+
+ return 0;
+}
+
+static int lpass_pcm_mi2s_close(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct lpass_runtime_data_t *prtd = runtime->private_data;
+
+ if (prtd) {
+ lpaif_dai_stop(prtd->lpaif_info.dma_ch);
+ lpaif_unregister_dma_irq_handler(prtd->lpaif_info.dma_ch);
+ kfree(prtd);
+ }
+
+ return 0;
+}
+
+static int lpass_pcm_mi2s_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ lpaif_cfg_i2s_playback(1, 0, LPAIF_MI2S);
+ } else {
+ pr_err("%s: Invalid stream direction\n", __func__);
+ ret = -EINVAL;
+ }
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ lpaif_cfg_i2s_playback(0, 0, LPAIF_MI2S);
+ } else {
+ pr_err("%s: Invalid stream direction\n", __func__);
+ ret = -EINVAL;
+ }
+ break;
+ default:
+ pr_err("%s: Invalid trigger command given\n", __func__);
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static int lpass_pcm_mi2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct lpass_runtime_data_t *prtd = runtime->private_data;
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+ prtd->pcm_stream_info.pcm_prepare_start = 0;
+ prtd->pcm_stream_info.period_index = 0;
+ return 0;
+}
+
+static int lpass_pcm_mi2s_open(struct snd_pcm_substream *substream)
+{
+ int ret;
+ struct lpass_runtime_data_t *prtd;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ runtime->dma_bytes =
+ lpass_pcm_hardware_playback.buffer_bytes_max;
+ snd_soc_set_runtime_hwparams(substream,
+ &lpass_pcm_hardware_playback);
+ } else {
+ pr_err("%s: Invalid stream direction\n", __func__);
+ return -EINVAL;
+ }
+
+ ret = snd_pcm_hw_constraint_integer(runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (ret < 0) {
+ pr_err("%s: snd_pcm_hw_constraint_integer failed\n", __func__);
+ return -EINVAL;
+ }
+
+ prtd = kzalloc(sizeof(struct lpass_runtime_data_t), GFP_KERNEL);
+ if (prtd == NULL)
+ return -ENOMEM;
+
+ prtd->pcm_stream_info.pcm_prepare_start = 0;
+ prtd->lpaif_clk.is_bit_clk_enabled = 0;
+ prtd->lpaif_clk.is_osr_clk_enabled = 0;
+ prtd->lpaif_info.dma_ch = LPAIF_MI2S_DMA_RD_CH;
+
+ prtd->pcm_stream_info.substream = substream;
+ runtime->private_data = prtd;
+
+ return 0;
+}
+
+static struct snd_pcm_ops lpass_asoc_pcm_mi2s_ops = {
+ .open = lpass_pcm_mi2s_open,
+ .hw_params = lpass_pcm_mi2s_hw_params,
+ .trigger = lpass_pcm_mi2s_trigger,
+ .ioctl = snd_pcm_lib_ioctl,
+ .close = lpass_pcm_mi2s_close,
+ .prepare = lpass_pcm_mi2s_prepare,
+ .mmap = lpass_pcm_mi2s_mmap,
+ .pointer = lpass_pcm_mi2s_pointer,
+};
+
+static void lpass_asoc_pcm_mi2s_free(struct snd_pcm *pcm)
+{
+ lpass_pcm_free_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
+}
+
+static int lpass_asoc_pcm_mi2s_new(struct snd_soc_pcm_runtime *prtd)
+{
+ struct snd_card *card = prtd->card->snd_card;
+ struct snd_pcm *pcm = prtd->pcm;
+ int ret = 0;
+
+ if (!card->dev->coherent_dma_mask)
+ card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+ if (!card->dev->dma_mask)
+ card->dev->dma_mask = &card->dev->coherent_dma_mask;
+
+ if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+ ret = lpass_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_PLAYBACK);
+ } else {
+ pr_err("%s: Invalid stream direction\n", __func__);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static struct snd_soc_platform_driver lpass_asoc_pcm_mi2s_platform = {
+ .ops = &lpass_asoc_pcm_mi2s_ops,
+ .pcm_new = lpass_asoc_pcm_mi2s_new,
+ .pcm_free = lpass_asoc_pcm_mi2s_free,
+};
+
+static int lpass_pcm_mi2s_driver_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ ret = snd_soc_register_platform(&pdev->dev,
+ &lpass_asoc_pcm_mi2s_platform);
+ if (ret)
+ dev_err(&pdev->dev, "%s: Failed to register pcm device: %d\n",
+ __func__, ret);
+
+ return ret;
+}
+
+static int lpass_pcm_mi2s_driver_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_platform(&pdev->dev);
+
+ return 0;
+}
+
+static const struct of_device_id lpass_pcm_mi2s_dt_match[] = {
+ { .compatible = "qcom,lpass-pcm-mi2s", },
+ {}
+};
+
+static struct platform_driver lpass_pcm_mi2s_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = lpass_pcm_mi2s_dt_match,
+ },
+ .probe = lpass_pcm_mi2s_driver_probe,
+ .remove = lpass_pcm_mi2s_driver_remove,
+};
+module_platform_driver(lpass_pcm_mi2s_driver);
+
+MODULE_DESCRIPTION("LPASS PCM MI2S Platform Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, lpass_pcm_mi2s_dt_match);
+MODULE_VERSION(DRV_VERSION);
diff --git a/sound/soc/qcom/lpass-pcm-mi2s.h b/sound/soc/qcom/lpass-pcm-mi2s.h
new file mode 100644
index 0000000000000000000000000000000000000000..edd43c4d419d1999babe20d4e6f58c77df38c6e1
--- /dev/null
+++ b/sound/soc/qcom/lpass-pcm-mi2s.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2014 The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _LPASS_PCM_MI2S_H
+#define _LPAS_PCM_MI2S_H
+
+struct lpass_pcm_stream_t {
+ uint8_t pcm_prepare_start;
+ uint32_t period_index;
+ struct snd_pcm_substream *substream;
+ uint32_t bit_width;
+};
+
+struct lpass_lpaif_t {
+ uint8_t lpa_if_dma_start;
+ uint8_t dma_ch;
+};
+
+struct lpass_lpaif_clk_t {
+ uint8_t is_bit_clk_enabled;
+ uint8_t is_osr_clk_enabled;
+};
+
+struct lpass_runtime_data_t {
+ struct lpass_pcm_stream_t pcm_stream_info;
+ struct lpass_lpaif_t lpaif_info;
+ struct lpass_lpaif_clk_t lpaif_clk;
+};
+
+#endif /* _LPASS_PCM_MI2S_H */
--
1.8.2.1
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