ASoC: amd: add ACP PCI driver for RPL platform

ACP is a PCI audio device.
This patch adds PCI driver to bind to this device and get
PCI resources.
Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@amd.com>
Reviewed-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Link: https://lore.kernel.org/r/20220721061035.91139-2-Syed.SabaKareem@amd.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/rpl/rpl-pci-acp6x.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AMD RPL ACP PCI Driver
+ *
+ * Copyright 2022 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include "rpl_acp6x.h"
+
+struct rpl_dev_data {
+	void __iomem *acp6x_base;
+};
+
+static int snd_rpl_probe(struct pci_dev *pci,
+			 const struct pci_device_id *pci_id)
+{
+	struct rpl_dev_data *adata;
+	u32 addr;
+	int ret;
+
+	/* RPL device check */
+	switch (pci->revision) {
+	case 0x62:
+		break;
+	default:
+		dev_dbg(&pci->dev, "acp6x 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 ACP6x audio");
+	if (ret < 0) {
+		dev_err(&pci->dev, "pci_request_regions failed\n");
+		goto disable_pci;
+	}
+
+	adata = devm_kzalloc(&pci->dev, sizeof(struct rpl_dev_data),
+			     GFP_KERNEL);
+	if (!adata) {
+		ret = -ENOMEM;
+		goto release_regions;
+	}
+
+	addr = pci_resource_start(pci, 0);
+	adata->acp6x_base = devm_ioremap(&pci->dev, addr,
+					 pci_resource_len(pci, 0));
+	if (!adata->acp6x_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_rpl_remove(struct pci_dev *pci)
+{
+	pci_release_regions(pci);
+	pci_disable_device(pci);
+}
+
+static const struct pci_device_id snd_rpl_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_rpl_ids);
+
+static struct pci_driver rpl_acp6x_driver  = {
+	.name = KBUILD_MODNAME,
+	.id_table = snd_rpl_ids,
+	.probe = snd_rpl_probe,
+	.remove = snd_rpl_remove,
+};
+
+module_pci_driver(rpl_acp6x_driver);
+
+MODULE_DESCRIPTION("AMD ACP RPL PCI driver");
+MODULE_LICENSE("GPL v2");

sound/soc/amd/rpl/rpl_acp6x.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * AMD ACP Driver
+ *
+ * Copyright (C) 2021 Advanced Micro Devices, Inc. All rights reserved.
+ */
+
+#include "rpl_acp6x_chip_offset_byte.h"
+
+#define ACP_DEVICE_ID 0x15E2
+#define ACP6x_PHY_BASE_ADDRESS 0x1240000
+
+static inline u32 rpl_acp_readl(void __iomem *base_addr)
+{
+	return readl(base_addr - ACP6x_PHY_BASE_ADDRESS);
+}
+
+static inline void rpl_acp_writel(u32 val, void __iomem *base_addr)
+{
+	writel(val, base_addr - ACP6x_PHY_BASE_ADDRESS);
+}