[PATCH 4/9] ASoC: ipq806x: Add LPASS CPU DAI driver

[Kenneth Westfield <kwestfie@codeaurora.org>]

From: Kenneth Westfield <kwestfie@codeaurora.org>

Add the CPU DAI driver for the QCOM LPASS SOC.

Change-Id: I64ac4407dd32bb9a3066d4b7427292002eaf5d14
Signed-off-by: Kenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@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;
+		break;
+	case 48000:
+		if (bit_width == 24)
+			return 4;
+		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);
-- 
1.8.2.1