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From:   Vijendar Mukunda <vijendar.mukunda@amd.com>
To:     <broonie@kernel.org>, <alsa-devel@alsa-project.org>
CC:     <Alexander.Deucher@amd.com>, <Sunil-kumar.Dommati@amd.com>,
        "Vijendar Mukunda" <Vijendar.Mukunda@amd.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        "Vijendar Mukunda" <vijendar.mukunda@amd.com>,
        open list <linux-kernel@vger.kernel.org>
Subject: [PATCH 03/12] add acp5x init/de-init functions
Date:   Wed, 7 Jul 2021 11:26:14 +0530
Message-ID: <20210707055623.27371-4-vijendar.mukunda@amd.com>
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From: Vijendar Mukunda <Vijendar.Mukunda@amd.com>

Add Vangogh ACP PCI driver init/deinit functions.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
---
 sound/soc/amd/vangogh/acp5x.h     |  12 +++
 sound/soc/amd/vangogh/pci-acp5x.c | 135 ++++++++++++++++++++++++++++++
 2 files changed, 147 insertions(+)

diff --git a/sound/soc/amd/vangogh/acp5x.h b/sound/soc/amd/vangogh/acp5x.h
index a5e7f7cb65a1..11b555306958 100644
--- a/sound/soc/amd/vangogh/acp5x.h
+++ b/sound/soc/amd/vangogh/acp5x.h
@@ -9,6 +9,18 @@
 
 #define ACP5x_PHY_BASE_ADDRESS 0x1240000
 #define ACP_DEVICE_ID 0x15E2
+#define ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK	0x00010001
+
+#define ACP_PGFSM_CNTL_POWER_ON_MASK	0x01
+#define ACP_PGFSM_CNTL_POWER_OFF_MASK	0x00
+#define ACP_PGFSM_STATUS_MASK		0x03
+#define ACP_POWERED_ON			0x00
+#define ACP_POWER_ON_IN_PROGRESS	0x01
+#define ACP_POWERED_OFF			0x02
+#define ACP_POWER_OFF_IN_PROGRESS	0x03
+
+#define ACP_ERR_INTR_MASK	0x20000000
+#define ACP_EXT_INTR_STAT_CLEAR_MASK 0xFFFFFFFF
 
 static inline u32 acp_readl(void __iomem *base_addr)
 {
diff --git a/sound/soc/amd/vangogh/pci-acp5x.c b/sound/soc/amd/vangogh/pci-acp5x.c
index e56d060a5cb9..dbe8fef3e294 100644
--- a/sound/soc/amd/vangogh/pci-acp5x.c
+++ b/sound/soc/amd/vangogh/pci-acp5x.c
@@ -7,13 +7,138 @@
 #include <linux/pci.h>
 #include <linux/module.h>
 #include <linux/io.h>
+#include <linux/delay.h>
 
 #include "acp5x.h"
 
+static int acp_power_gating;
+module_param(acp_power_gating, int, 0644);
+MODULE_PARM_DESC(acp_power_gating, "acp power gating flag");
+
 struct acp5x_dev_data {
 	void __iomem *acp5x_base;
 };
 
+static int acp5x_power_on(void __iomem *acp5x_base)
+{
+	u32 val;
+	int timeout;
+
+	val = acp_readl(acp5x_base + ACP_PGFSM_STATUS);
+
+	if (val == 0)
+		return val;
+
+	if ((val & ACP_PGFSM_STATUS_MASK) !=
+				ACP_POWER_ON_IN_PROGRESS)
+		acp_writel(ACP_PGFSM_CNTL_POWER_ON_MASK,
+			   acp5x_base + ACP_PGFSM_CONTROL);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = acp_readl(acp5x_base + ACP_PGFSM_STATUS);
+		if (!val)
+			return 0;
+		udelay(1);
+	}
+	return -ETIMEDOUT;
+}
+
+static int acp5x_power_off(void __iomem *acp5x_base)
+{
+	u32 val;
+	int timeout;
+
+	acp_writel(ACP_PGFSM_CNTL_POWER_OFF_MASK,
+		   acp5x_base + ACP_PGFSM_CONTROL);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = acp_readl(acp5x_base + ACP_PGFSM_STATUS);
+		if ((val & ACP_PGFSM_STATUS_MASK) == ACP_POWERED_OFF)
+			return 0;
+		udelay(1);
+	}
+	return -ETIMEDOUT;
+}
+
+static int acp5x_reset(void __iomem *acp5x_base)
+{
+	u32 val;
+	int timeout;
+
+	acp_writel(1, acp5x_base + ACP_SOFT_RESET);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = acp_readl(acp5x_base + ACP_SOFT_RESET);
+		if (val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK)
+			break;
+		cpu_relax();
+	}
+	acp_writel(0, acp5x_base + ACP_SOFT_RESET);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = acp_readl(acp5x_base + ACP_SOFT_RESET);
+		if (!val)
+			return 0;
+		cpu_relax();
+	}
+	return -ETIMEDOUT;
+}
+
+static void acp5x_enable_interrupts(void __iomem *acp5x_base)
+{
+	acp_writel(0x01, acp5x_base + ACP_EXTERNAL_INTR_ENB);
+}
+
+static void acp5x_disable_interrupts(void __iomem *acp5x_base)
+{
+	acp_writel(ACP_EXT_INTR_STAT_CLEAR_MASK, acp5x_base +
+		   ACP_EXTERNAL_INTR_STAT);
+	acp_writel(0x00, acp5x_base + ACP_EXTERNAL_INTR_CNTL);
+	acp_writel(0x00, acp5x_base + ACP_EXTERNAL_INTR_ENB);
+}
+
+static int acp5x_init(void __iomem *acp5x_base)
+{
+	int ret;
+
+	/* power on */
+	ret = acp5x_power_on(acp5x_base);
+	if (ret) {
+		pr_err("ACP5x power on failed\n");
+		return ret;
+	}
+	/* Reset */
+	ret = acp5x_reset(acp5x_base);
+	if (ret) {
+		pr_err("ACP5x reset failed\n");
+		return ret;
+	}
+	acp5x_enable_interrupts(acp5x_base);
+	return 0;
+}
+
+static int acp5x_deinit(void __iomem *acp5x_base)
+{
+	int ret;
+
+	acp5x_disable_interrupts(acp5x_base);
+	/* Reset */
+	ret = acp5x_reset(acp5x_base);
+	if (ret) {
+		pr_err("ACP5x reset failed\n");
+		return ret;
+	}
+	/* power off */
+	if (acp_power_gating) {
+		ret = acp5x_power_off(acp5x_base);
+		if (ret) {
+			pr_err("ACP5x power off failed\n");
+			return ret;
+		}
+	}
+	return 0;
+}
+
 static int snd_acp5x_probe(struct pci_dev *pci,
 			   const struct pci_device_id *pci_id)
 {
@@ -50,6 +175,9 @@ static int snd_acp5x_probe(struct pci_dev *pci,
 	}
 	pci_set_master(pci);
 	pci_set_drvdata(pci, adata);
+	ret = acp5x_init(adata->acp5x_base);
+	if (ret)
+		goto release_regions;
 
 release_regions:
 	pci_release_regions(pci);
@@ -61,6 +189,13 @@ static int snd_acp5x_probe(struct pci_dev *pci,
 
 static void snd_acp5x_remove(struct pci_dev *pci)
 {
+	struct acp5x_dev_data *adata;
+	int ret;
+
+	adata = pci_get_drvdata(pci);
+	ret = acp5x_deinit(adata->acp5x_base);
+	if (ret)
+		dev_err(&pci->dev, "ACP de-init failed\n");
 	pci_release_regions(pci);
 	pci_disable_device(pci);
 }
-- 
2.17.1