linux-kernel - [PATCH 06/13] ASoC: amd: add acp6.2 irq handler

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Date:   Fri, 12 Aug 2022 17:37:24 +0530
From:   Syed Saba kareem <Syed.SabaKareem@....com>
To:     <broonie@...nel.org>, <alsa-devel@...a-project.org>
CC:     <Vijendar.Mukunda@....com>, <Basavaraj.Hiregoudar@....com>,
        <Sunil-kumar.Dommati@....com>, <mario.limonciello@....com>,
        Syed Saba kareem <Syed.SabaKareem@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        "Jaroslav Kysela" <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH 06/13] ASoC: amd: add acp6.2 irq handler

Add ACP6.2 irq handler for handling irq events for ACP IP.
Add pdm irq events handling.
Whenever audio data equal to the PDM watermark level are consumed,
interrupt is generated. Acknowledge the interrupt.

Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@....com>
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
---
 sound/soc/amd/ps/acp62.h  |  2 ++
 sound/soc/amd/ps/pci-ps.c | 31 +++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/sound/soc/amd/ps/acp62.h b/sound/soc/amd/ps/acp62.h
index 7636bfeb8a8a..563252834b09 100644
--- a/sound/soc/amd/ps/acp62.h
+++ b/sound/soc/amd/ps/acp62.h
@@ -25,6 +25,7 @@
 
 #define ACP_ERROR_MASK 0x20000000
 #define ACP_EXT_INTR_STAT_CLEAR_MASK 0xFFFFFFFF
+#define PDM_DMA_STAT 0x10
 
 enum acp_config {
 	ACP_CONFIG_0 = 0,
@@ -46,6 +47,7 @@ enum acp_config {
 };
 
 struct pdm_dev_data {
+	u32 pdm_irq;
 	void __iomem *acp62_base;
 	struct snd_pcm_substream *capture_stream;
 };
diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
index 94201f75427a..4140fb42a7f7 100644
--- a/sound/soc/amd/ps/pci-ps.c
+++ b/sound/soc/amd/ps/pci-ps.c
@@ -11,6 +11,8 @@
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/acpi.h>
+#include <linux/interrupt.h>
+#include <sound/pcm_params.h>
 
 #include "acp62.h"
 
@@ -118,6 +120,27 @@ static int acp62_deinit(void __iomem *acp_base)
 	return 0;
 }
 
+static irqreturn_t acp62_irq_handler(int irq, void *dev_id)
+{
+	struct acp62_dev_data *adata;
+	struct pdm_dev_data *ps_pdm_data;
+	u32 val;
+
+	adata = dev_id;
+	if (!adata)
+		return IRQ_NONE;
+
+	val = acp62_readl(adata->acp62_base + ACP_EXTERNAL_INTR_STAT);
+	if (val & BIT(PDM_DMA_STAT)) {
+		ps_pdm_data = dev_get_drvdata(&adata->pdev[0]->dev);
+		acp62_writel(BIT(PDM_DMA_STAT), adata->acp62_base + ACP_EXTERNAL_INTR_STAT);
+		if (ps_pdm_data->capture_stream)
+			snd_pcm_period_elapsed(ps_pdm_data->capture_stream);
+		return IRQ_HANDLED;
+	}
+	return IRQ_NONE;
+}
+
 static int snd_acp62_probe(struct pci_dev *pci,
 			   const struct pci_device_id *pci_id)
 {
@@ -127,7 +150,9 @@ static int snd_acp62_probe(struct pci_dev *pci,
 	int val = 0x00;
 	struct acpi_device *adev;
 	u32 addr;
+	unsigned int irqflags;
 
+	irqflags = IRQF_SHARED;
 	/* Pink Sardine device check */
 	switch (pci->revision) {
 	case 0x63:
@@ -223,6 +248,12 @@ static int snd_acp62_probe(struct pci_dev *pci,
 						goto unregister_devs;
 					}
 				}
+				ret = devm_request_irq(&pci->dev, pci->irq, acp62_irq_handler,
+						       irqflags, "ACP_PCI_IRQ", adata);
+				if (ret) {
+					dev_err(&pci->dev, "ACP PCI IRQ request failed\n");
+					goto unregister_devs;
+				}
 			}
 		}
 		break;
-- 
2.25.1