On 11/19/14, 12:52 PM, Kenneth Westfield wrote:
From: Kenneth Westfield <kwest...@codeaurora.org>
Add the CPU DAI driver for the QCOM LPASS SOC.
Change-Id: I64ac4407dd32bb9a3066d4b7427292002eaf5d14
Signed-off-by: Kenneth Westfield <kwest...@codeaurora.org>
Signed-off-by: Banajit Goswami <bgosw...@codeaurora.org>
---
sound/soc/qcom/lpass-cpu-dai.c | 307 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 307 insertions(+)
create mode 100644 sound/soc/qcom/lpass-cpu-dai.c
diff --git a/sound/soc/qcom/lpass-cpu-dai.c b/sound/soc/qcom/lpass-cpu-dai.c
new file mode 100644
index
0000000000000000000000000000000000000000..0693e761e01fd416f52684977bcfaf1579dc259c
--- /dev/null
+++ b/sound/soc/qcom/lpass-cpu-dai.c
@@ -0,0 +1,307 @@
+/*
+ * 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/clk.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include "lpass-lpaif.h"
+#include "lpass-pcm-mi2s.h"
+
+#define DRV_NAME "lpass-cpu-dai"
+#define DRV_VERSION "1.0"
+
+#define LPASS_INVALID (-1)
+
+struct mi2s_hw_params {
+ uint8_t channels;
+ uint32_t freq;
+ uint8_t bit_width;
+};
+
+static struct clk *lpaif_mi2s_bit_clk;
+static struct clk *lpaif_mi2s_osr_clk;
+static struct mi2s_hw_params mi2s_params;
+
+/*
+ * Returns the OSR to BIT clock divider that would be used with the given
+ * stream characteristics.
+ */
+static uint32_t lpass_cpu_get_bit_div(uint32_t samp_freq, uint32_t bit_width,
+ uint32_t channels)
+{
+ if (channels == 8) {
+ if (bit_width == 24 &&
+ ((samp_freq != 176400) &&
+ (samp_freq != 192000)))
+ return 2;
+ return 1;
+ } else if (channels == 6) {
+ if ((bit_width == 32 && ((samp_freq == 176400) ||
+ (samp_freq == 192000))) || (bit_width == 24 &&
+ (samp_freq == 192000)))
+ return 1;
+ else
+ return 2;
+ }
+
+ switch (samp_freq) {
+ case 8000:
+ case 16000:
+ case 32000:
+ case 64000:
+ if (bit_width == 16)
+ return 4;
Does this test have any value? the behavior is identical in all cases.
+ break;
+ case 48000:
+ if (bit_width == 24)
+ return 4;
same.
+ break;
+ case 96000:
+ case 192000:
+ return 4;
+ case 176400:
+ return 2;
+ case 11025:
+ case 22050:
+ case 44100:
+ case 88200:
+ default:
+ pr_err("%s: Invalid PCM format given\n", __func__);
+ return LPASS_INVALID;
+ }
+
+ return 4;
+}
+
+static int lpass_cpu_mi2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ uint32_t ret = 0;
+ uint32_t bit_act;
+ uint16_t bit_div;
+ uint32_t bit_width = params_format(params);
+ uint32_t channels = params_channels(params);
+ uint32_t rate = params_rate(params);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct lpass_runtime_data_t *prtd = runtime->private_data;
+ struct mi2s_hw_params curr_params;
+
+ bit_act = snd_pcm_format_width(bit_width);
+ if (bit_act == LPASS_INVALID) {
+ dev_err(dai->dev, "%s: Invalid bit width given\n", __func__);
+ return -EINVAL;
+ }
+
+ prtd->pcm_stream_info.bit_width = bit_act;
+ curr_params.freq = rate;
+ curr_params.channels = channels;
+ curr_params.bit_width = bit_act;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ /* disable SPKR to make sure it will start in sane state */
+ lpaif_cfg_i2s_playback(0, 0, LPAIF_MI2S);
+
+ /*
+ * Set channel info, it will take effect only if SPKR is
+ * enabled
+ */
+ ret = lpaif_cfg_mi2s_playback_hwparams_channels(channels,
+ LPAIF_MI2S, bit_act);
+ } else {
+ dev_err(dai->dev, "%s: Invalid stream direction\n", __func__);
+ return -EINVAL;
+ }
+
+ /* Make sure our channel setting was success */
+ if (ret) {
+ /* shutdown would be called where we restore stuff */
+ dev_err(dai->dev, "%s: Channel setting unsuccessful\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ mi2s_params.freq = rate;
+ mi2s_params.channels = channels;
+ mi2s_params.bit_width = bit_act;
+
+ ret = lpaif_cfg_mi2s_hwparams_bit_width(bit_width, LPAIF_MI2S);
+ if (ret) {
+ dev_err(dai->dev, "%s: Could not set bit width in HW\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ bit_div = lpass_cpu_get_bit_div(rate, bit_act, channels);
+ if (bit_div == LPASS_INVALID) {
+ dev_err(dai->dev, "%s: Could not get bit clk divider\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ ret = clk_set_rate(lpaif_mi2s_osr_clk,
+ (rate * bit_act * channels * bit_div));
+ if (ret) {
+ dev_err(dai->dev, "%s: error in setting mi2s osr clk\n",
+ __func__);
+ return ret;
+ }
+ ret = clk_prepare_enable(lpaif_mi2s_osr_clk);
+ if (ret) {
+ dev_err(dai->dev, "%s: error in enabling mi2s osr clk\n",
+ __func__);
+ return ret;
+ }
+ prtd->lpaif_clk.is_osr_clk_enabled = 1;
+
+ ret = clk_set_rate(lpaif_mi2s_bit_clk, rate * bit_act * channels);
+ if (ret) {
+ dev_err(dai->dev, "%s: error in setting mi2s bit clk\n",
+ __func__);
+ return ret;
+ }
+ ret = clk_prepare_enable(lpaif_mi2s_bit_clk);
+ if (ret) {
+ dev_err(dai->dev, "%s: error in enabling mi2s bit clk\n",
+ __func__);
+ return ret;
+ }
+ prtd->lpaif_clk.is_bit_clk_enabled = 1;
+
+ return 0;
+}
+
+static int lpass_cpu_mi2s_prepare(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ return 0;
+}
+
+static int lpass_cpu_mi2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+
+ lpaif_mi2s_osr_clk = clk_get(dai->dev, "mi2s_osr_clk");
+ if (IS_ERR(lpaif_mi2s_osr_clk)) {
+ dev_err(dai->dev, "%s: Error in getting mi2s_osr_clk\n",
+ __func__);
+ return PTR_ERR(lpaif_mi2s_osr_clk);
+ }
+
+ lpaif_mi2s_bit_clk = clk_get(dai->dev, "mi2s_bit_clk");
+ if (IS_ERR(lpaif_mi2s_bit_clk)) {
+ dev_err(dai->dev, "%s: Error in getting mi2s_bit_clk\n",
+ __func__);
+ return PTR_ERR(lpaif_mi2s_bit_clk);
+ }
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ lpaif_cfg_i2s_playback(0, 0, LPAIF_MI2S);
+ } else {
+ dev_err(dai->dev, "%s: Invalid stream direction\n", __func__);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void lpass_cpu_mi2s_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct lpass_runtime_data_t *prtd = runtime->private_data;
+
+ if (prtd->lpaif_clk.is_osr_clk_enabled)
+ clk_disable_unprepare(lpaif_mi2s_osr_clk);
+ clk_put(lpaif_mi2s_osr_clk);
+
+ if (prtd->lpaif_clk.is_bit_clk_enabled)
+ clk_disable_unprepare(lpaif_mi2s_bit_clk);
+ clk_put(lpaif_mi2s_bit_clk);
+}
+
+static int lpass_cpu_mi2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ return 0;
+}
+
+static struct snd_soc_dai_ops lpass_cpu_mi2s_ops = {
+ .startup = lpass_cpu_mi2s_startup,
+ .prepare = lpass_cpu_mi2s_prepare,
+ .hw_params = lpass_cpu_mi2s_hw_params,
+ .shutdown = lpass_cpu_mi2s_shutdown,
+ .set_fmt = lpass_cpu_mi2s_set_fmt,
+};
+
+static struct snd_soc_dai_driver lpass_cpu_dais[] = {
+ {
+ .playback = {
+ .rates = SNDRV_PCM_RATE_8000_192000,
+ .formats = SNDRV_PCM_FMTBIT_S16 |
+ SNDRV_PCM_FMTBIT_S24 |
+ SNDRV_PCM_FMTBIT_S32,
+ .channels_min = 2,
+ .channels_max = 2,
+ .rate_min = 8000,
+ .rate_max = 192000,
+ },
+ .ops = &lpass_cpu_mi2s_ops,
+ .name = "lpass-mi2s-dai"
+ },
+};
+
+static const struct snd_soc_component_driver lpass_cpu_component = {
+ .name = DRV_NAME,
+};
+
+static int lpass_cpu_dai_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ ret = snd_soc_register_component(&pdev->dev, &lpass_cpu_component,
+ lpass_cpu_dais, ARRAY_SIZE(lpass_cpu_dais));
+ if (ret)
+ dev_err(&pdev->dev, "%s: error registering soc dais\n",
+ __func__);
+
+ return ret;
+}
+
+static int lpass_cpu_dai_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_component(&pdev->dev);
+ return 0;
+}
+
+static const struct of_device_id lpass_cpu_dai_dt_match[] = {
+ {.compatible = "qcom,lpass-cpu-dai"},
+ {}
+};
+
+static struct platform_driver lpass_cpu_dai_driver = {
+ .probe = lpass_cpu_dai_probe,
+ .remove = lpass_cpu_dai_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = lpass_cpu_dai_dt_match,
+ },
+};
+module_platform_driver(lpass_cpu_dai_driver);
+
+MODULE_DESCRIPTION("QCOM LPASS CPU DAI DRIVER");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, lpass_cpu_dai_dt_match);
+MODULE_VERSION(DRV_VERSION);
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