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From:   Vijendar Mukunda <Vijendar.Mukunda@amd.com>
CC:     <vijendar.mukunda@amd.com>, <Alexander.Deucher@amd.com>,
        <Vishnuvardhanrao.Ravulapati@amd.com>,
        Vijendar Mukunda <Vijendar.Mukunda@amd.com>,
        Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        "Mark Brown" <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        Sanju R Mehta <sanju.mehta@amd.com>,
        open list <linux-kernel@vger.kernel.org>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@alsa-project.org>
Subject: [PATCH 04/11] ASoC: amd: add ACP3x PCM platform driver
Date:   Mon, 12 Nov 2018 11:04:55 +0530
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PCM platform driver binds to the platform device created by ACP3x PCI
device. PCM driver registers ALSA DMA and CPU DAI components with ASoC
framework.

Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>
Tested-by: Ravulapati Vishnu vardhan Rao <Vishnuvardhanrao.Ravulapati@amd.com>
Signed-off-by: Vijendar Mukunda <vijendar.mukunda@amd.com>
---
 sound/soc/amd/raven/acp3x-pcm-dma.c | 263 ++++++++++++++++++++++++++++++++++++
 sound/soc/amd/raven/acp3x.h         |   7 +
 2 files changed, 270 insertions(+)
 create mode 100644 sound/soc/amd/raven/acp3x-pcm-dma.c

diff --git a/sound/soc/amd/raven/acp3x-pcm-dma.c b/sound/soc/amd/raven/acp3x-pcm-dma.c
new file mode 100644
index 0000000..3e806f7
--- /dev/null
+++ b/sound/soc/amd/raven/acp3x-pcm-dma.c
@@ -0,0 +1,263 @@
+/*
+ * AMD ALSA SoC PCM Driver
+ *
+ * Copyright 2016 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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/platform_device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "acp3x.h"
+
+#define DRV_NAME "acp3x-i2s-audio"
+
+struct i2s_dev_data {
+	void __iomem *acp3x_base;
+	struct snd_pcm_substream *play_stream;
+	struct snd_pcm_substream *capture_stream;
+};
+
+static int acp3x_power_on(void __iomem *acp3x_base, bool on)
+{
+	u16 val, mask;
+	u32 timeout;
+
+	if (on == true) {
+		val = 1;
+		mask = ACP3x_POWER_ON;
+	} else {
+		val = 0;
+		mask = ACP3x_POWER_OFF;
+	}
+
+	rv_writel(val, acp3x_base + mmACP_PGFSM_CONTROL);
+	timeout = 0;
+	while (true) {
+		val = rv_readl(acp3x_base + mmACP_PGFSM_STATUS);
+		if ((val & ACP3x_POWER_OFF_IN_PROGRESS) == mask)
+			break;
+		if (timeout > 100) {
+			pr_err("ACP3x power state change failure\n");
+			return -ENODEV;
+		}
+		timeout++;
+		cpu_relax();
+	}
+	return 0;
+}
+
+static int acp3x_reset(void __iomem *acp3x_base)
+{
+	u32 val, timeout;
+
+	rv_writel(1, acp3x_base + mmACP_SOFT_RESET);
+	timeout = 0;
+	while (true) {
+		val = rv_readl(acp3x_base + mmACP_SOFT_RESET);
+		if ((val & ACP3x_SOFT_RESET__SoftResetAudDone_MASK) ||
+		     timeout > 100) {
+			if (val & ACP3x_SOFT_RESET__SoftResetAudDone_MASK)
+				break;
+			return -ENODEV;
+		}
+		timeout++;
+		cpu_relax();
+	}
+
+	rv_writel(0, acp3x_base + mmACP_SOFT_RESET);
+	timeout = 0;
+	while (true) {
+		val = rv_readl(acp3x_base + mmACP_SOFT_RESET);
+		if (!val || timeout > 100) {
+			if (!val)
+				break;
+			return -ENODEV;
+		}
+		timeout++;
+		cpu_relax();
+	}
+	return 0;
+}
+
+static int acp3x_init(void __iomem *acp3x_base)
+{
+	int ret;
+
+	/* power on */
+	ret = acp3x_power_on(acp3x_base, true);
+	if (ret) {
+		pr_err("ACP3x power on failed\n");
+		return ret;
+	}
+	/* Reset */
+	ret = acp3x_reset(acp3x_base);
+	if (ret) {
+		pr_err("ACP3x reset failed\n");
+		return ret;
+	}
+	return 0;
+}
+
+static int acp3x_deinit(void __iomem *acp3x_base)
+{
+	int ret;
+
+	/* Reset */
+	ret = acp3x_reset(acp3x_base);
+	if (ret) {
+		pr_err("ACP3x reset failed\n");
+		return ret;
+	}
+	/* power off */
+	ret = acp3x_power_on(acp3x_base, false);
+	if (ret) {
+		pr_err("ACP3x power off failed\n");
+		return ret;
+	}
+	return 0;
+}
+
+static struct snd_pcm_ops acp3x_dma_ops = {
+	.open = NULL,
+	.close = NULL,
+	.ioctl = NULL,
+	.hw_params = NULL,
+	.hw_free = NULL,
+	.pointer = NULL,
+	.mmap = NULL,
+};
+
+struct snd_soc_dai_ops acp3x_dai_i2s_ops = {
+	.hw_params = NULL,
+	.trigger   = NULL,
+	.set_fmt = NULL,
+};
+
+static struct snd_soc_dai_driver acp3x_i2s_dai_driver = {
+	.playback = {
+		.rates = SNDRV_PCM_RATE_8000_96000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 |
+					SNDRV_PCM_FMTBIT_U8 |
+					SNDRV_PCM_FMTBIT_S24_LE |
+					SNDRV_PCM_FMTBIT_S32_LE,
+		.channels_min = 2,
+		.channels_max = 8,
+
+		.rate_min = 8000,
+		.rate_max = 96000,
+	},
+	.capture = {
+		.rates = SNDRV_PCM_RATE_8000_48000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 |
+					SNDRV_PCM_FMTBIT_U8 |
+					SNDRV_PCM_FMTBIT_S24_LE |
+					SNDRV_PCM_FMTBIT_S32_LE,
+		.channels_min = 2,
+		.channels_max = 2,
+		.rate_min = 8000,
+		.rate_max = 48000,
+	},
+	.ops = &acp3x_dai_i2s_ops,
+};
+
+static const struct snd_soc_component_driver acp3x_i2s_component = {
+	.name           = DRV_NAME,
+	.ops		= &acp3x_dma_ops,
+	.pcm_new	= acp3x_dma_new,
+};
+
+static int acp3x_audio_probe(struct platform_device *pdev)
+{
+	int status;
+	struct resource *res;
+	struct i2s_dev_data *adata;
+	unsigned int irqflags;
+
+	if (!pdev->dev.platform_data) {
+		dev_err(&pdev->dev, "platform_data not retrieved\n");
+		return -ENODEV;
+	}
+	irqflags = *((unsigned int *)(pdev->dev.platform_data));
+
+	adata = devm_kzalloc(&pdev->dev, sizeof(struct i2s_dev_data),
+			     GFP_KERNEL);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n");
+			return -ENODEV;
+	}
+
+	adata->acp3x_base = devm_ioremap(&pdev->dev, res->start,
+					 resource_size(res));
+
+	adata->play_stream = NULL;
+	adata->capture_stream = NULL;
+
+	dev_set_drvdata(&pdev->dev, adata);
+	/* Initialize ACP */
+	status = acp3x_init(adata->acp3x_base);
+	if (status)
+		return -ENODEV;
+	status = devm_snd_soc_register_component(&pdev->dev,
+						 &acp3x_i2s_component,
+						 &acp3x_i2s_dai_driver, 1);
+	if (status) {
+		dev_err(&pdev->dev, "Fail to register acp i2s dai\n");
+		goto dev_err;
+	}
+
+	return 0;
+dev_err:
+	status = acp3x_deinit(adata->acp3x_base);
+	if (status)
+		dev_err(&pdev->dev, "ACP de-init failed\n");
+	else
+		dev_info(&pdev->dev, "ACP de-initialized\n");
+	/*ignore device status and return driver probe error*/
+	return -ENODEV;
+}
+
+static int acp3x_audio_remove(struct platform_device *pdev)
+{
+	int ret;
+	struct i2s_dev_data *adata = dev_get_drvdata(&pdev->dev);
+
+	ret = acp3x_deinit(adata->acp3x_base);
+	if (ret)
+		dev_err(&pdev->dev, "ACP de-init failed\n");
+	else
+		dev_info(&pdev->dev, "ACP de-initialized\n");
+
+	return 0;
+}
+
+static struct platform_driver acp3x_dma_driver = {
+	.probe = acp3x_audio_probe,
+	.remove = acp3x_audio_remove,
+	.driver = {
+		.name = "acp3x_rv_i2s",
+	},
+};
+
+module_platform_driver(acp3x_dma_driver);
+
+MODULE_AUTHOR("Maruthi.Bayyavarapu@amd.com");
+MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
+MODULE_DESCRIPTION("AMD ACP 3.x PCM Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);
diff --git a/sound/soc/amd/raven/acp3x.h b/sound/soc/amd/raven/acp3x.h
index 83b1ed8..f3d3e51 100644
--- a/sound/soc/amd/raven/acp3x.h
+++ b/sound/soc/amd/raven/acp3x.h
@@ -5,6 +5,13 @@
 #define	ACP3x_REG_START	0x1240000
 #define	ACP3x_REG_END	0x1250200
 #define I2S_MODE	0x04
+#define	BT_TX_THRESHOLD 26
+#define	BT_RX_THRESHOLD 25
+#define ACP3x_POWER_ON 0x00
+#define ACP3x_POWER_ON_IN_PROGRESS 0x01
+#define ACP3x_POWER_OFF 0x02
+#define ACP3x_POWER_OFF_IN_PROGRESS 0x03
+#define ACP3x_SOFT_RESET__SoftResetAudDone_MASK	0x00010001
 
 static inline u32 rv_readl(void __iomem *base_addr)
 {
-- 
2.7.4