[PATCH 02/13] ASoC: amd: add Pink Sardine ACP PCI driver

[Syed Saba kareem]

ACP is a PCI audio device.
This patch adds PCI driver to bind to this device and get
PCI resources for Pink Sardine Platform.

Signed-off-by: Syed Saba Kareem <Syed.SabaKareem at amd.com>
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda at amd.com>
---
 sound/soc/amd/ps/acp62.h  | 21 +++++++++
 sound/soc/amd/ps/pci-ps.c | 94 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 sound/soc/amd/ps/acp62.h
 create mode 100644 sound/soc/amd/ps/pci-ps.c

diff --git a/sound/soc/amd/ps/acp62.h b/sound/soc/amd/ps/acp62.h
new file mode 100644
index 000000000000..e91762240c93
--- /dev/null
+++ b/sound/soc/amd/ps/acp62.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * AMD ALSA SoC PDM Driver
+ *
+ * Copyright (C) 2022 Advanced Micro Devices, Inc. All rights reserved.
+ */
+
+#include <sound/acp62_chip_offset_byte.h>
+
+#define ACP_DEVICE_ID 0x15E2
+#define ACP62_PHY_BASE_ADDRESS 0x1240000
+
+static inline u32 acp62_readl(void __iomem *base_addr)
+{
+	return readl(base_addr - ACP62_PHY_BASE_ADDRESS);
+}
+
+static inline void acp62_writel(u32 val, void __iomem *base_addr)
+{
+	writel(val, base_addr - ACP62_PHY_BASE_ADDRESS);
+}
diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
new file mode 100644
index 000000000000..25169797275c
--- /dev/null
+++ b/sound/soc/amd/ps/pci-ps.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AMD Pink Sardine ACP PCI Driver
+ *
+ * Copyright 2022 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/io.h>
+
+#include "acp62.h"
+
+struct acp62_dev_data {
+	void __iomem *acp62_base;
+};
+
+static int snd_acp62_probe(struct pci_dev *pci,
+			   const struct pci_device_id *pci_id)
+{
+	struct acp62_dev_data *adata;
+	u32 addr;
+	int ret;
+
+	/* Pink Sardine device check */
+	switch (pci->revision) {
+	case 0x63:
+		break;
+	default:
+		dev_dbg(&pci->dev, "acp62 pci device not found\n");
+		return -ENODEV;
+	}
+	if (pci_enable_device(pci)) {
+		dev_err(&pci->dev, "pci_enable_device failed\n");
+		return -ENODEV;
+	}
+
+	ret = pci_request_regions(pci, "AMD ACP6.2 audio");
+	if (ret < 0) {
+		dev_err(&pci->dev, "pci_request_regions failed\n");
+		goto disable_pci;
+	}
+		adata = devm_kzalloc(&pci->dev, sizeof(struct acp62_dev_data),
+				     GFP_KERNEL);
+	if (!adata) {
+		ret = -ENOMEM;
+		goto release_regions;
+	}
+
+	addr = pci_resource_start(pci, 0);
+	adata->acp62_base = devm_ioremap(&pci->dev, addr,
+					 pci_resource_len(pci, 0));
+	if (!adata->acp62_base) {
+		ret = -ENOMEM;
+		goto release_regions;
+	}
+	pci_set_master(pci);
+	pci_set_drvdata(pci, adata);
+	return 0;
+release_regions:
+	pci_release_regions(pci);
+disable_pci:
+	pci_disable_device(pci);
+
+	return ret;
+}
+
+static void snd_acp62_remove(struct pci_dev *pci)
+{
+	pci_release_regions(pci);
+	pci_disable_device(pci);
+}
+
+static const struct pci_device_id snd_acp62_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_DEVICE_ID),
+	.class = PCI_CLASS_MULTIMEDIA_OTHER << 8,
+	.class_mask = 0xffffff },
+	{ 0, },
+};
+MODULE_DEVICE_TABLE(pci, snd_acp62_ids);
+
+static struct pci_driver ps_acp62_driver  = {
+	.name = KBUILD_MODNAME,
+	.id_table = snd_acp62_ids,
+	.probe = snd_acp62_probe,
+	.remove = snd_acp62_remove,
+};
+
+module_pci_driver(ps_acp62_driver);
+
+MODULE_AUTHOR("Vijendar.Mukunda at amd.com");
+MODULE_AUTHOR("Syed.SabaKareem at amd.com");
+MODULE_DESCRIPTION("AMD ACP Pink Sardine PCI driver");
+MODULE_LICENSE("GPL v2");
-- 
2.25.1