ASoC: amd: add Vangogh ACP PCI driver

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

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Link: https://lore.kernel.org/r/20210721180430.11571-3-Vijendar.Mukunda@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/vangogh/acp5x.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * AMD ALSA SoC PCM Driver
+ *
+ * Copyright (C) 2021 Advanced Micro Devices, Inc. All rights reserved.
+ */
+
+#include "vg_chip_offset_byte.h"
+
+#define ACP5x_PHY_BASE_ADDRESS 0x1240000
+#define ACP_DEVICE_ID 0x15E2
+
+/* common header file uses exact offset rather than relative
+ * offset which requires subtraction logic from base_addr
+ * for accessing ACP5x MMIO space registers
+ */
+static inline u32 acp_readl(void __iomem *base_addr)
+{
+	return readl(base_addr - ACP5x_PHY_BASE_ADDRESS);
+}
+
+static inline void acp_writel(u32 val, void __iomem *base_addr)
+{
+	writel(val, base_addr - ACP5x_PHY_BASE_ADDRESS);
+}

sound/soc/amd/vangogh/pci-acp5x.c

@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// AMD Vangogh ACP PCI Driver
+//
+// Copyright (C) 2021 Advanced Micro Devices, Inc. All rights reserved.
+
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/io.h>
+
+#include "acp5x.h"
+
+struct acp5x_dev_data {
+	void __iomem *acp5x_base;
+};
+
+static int snd_acp5x_probe(struct pci_dev *pci,
+			   const struct pci_device_id *pci_id)
+{
+	struct acp5x_dev_data *adata;
+	int ret;
+	u32 addr;
+
+	if (pci->revision != 0x50)
+		return -ENODEV;
+
+	if (pci_enable_device(pci)) {
+		dev_err(&pci->dev, "pci_enable_device failed\n");
+		return -ENODEV;
+	}
+
+	ret = pci_request_regions(pci, "AMD ACP5x audio");
+	if (ret < 0) {
+		dev_err(&pci->dev, "pci_request_regions failed\n");
+		goto disable_pci;
+	}
+
+	adata = devm_kzalloc(&pci->dev, sizeof(struct acp5x_dev_data),
+			     GFP_KERNEL);
+	if (!adata) {
+		ret = -ENOMEM;
+		goto release_regions;
+	}
+	addr = pci_resource_start(pci, 0);
+	adata->acp5x_base = devm_ioremap(&pci->dev, addr,
+					 pci_resource_len(pci, 0));
+	if (!adata->acp5x_base) {
+		ret = -ENOMEM;
+		goto release_regions;
+	}
+	pci_set_master(pci);
+	pci_set_drvdata(pci, adata);
+
+release_regions:
+	pci_release_regions(pci);
+disable_pci:
+	pci_disable_device(pci);
+
+	return ret;
+}
+
+static void snd_acp5x_remove(struct pci_dev *pci)
+{
+	pci_release_regions(pci);
+	pci_disable_device(pci);
+}
+
+static const struct pci_device_id snd_acp5x_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_acp5x_ids);
+
+static struct pci_driver acp5x_driver  = {
+	.name = KBUILD_MODNAME,
+	.id_table = snd_acp5x_ids,
+	.probe = snd_acp5x_probe,
+	.remove = snd_acp5x_remove,
+};
+
+module_pci_driver(acp5x_driver);
+
+MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
+MODULE_DESCRIPTION("AMD Vangogh ACP PCI driver");
+MODULE_LICENSE("GPL v2");