ASoC: AMD: add ACP3.0 PCI driver

ACP 3.0 is a PCI audio device. This patch adds PCI driver to bind
to this device and get PCI resources.
Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>
Signed-off-by: Sanju R Mehta <sanju.mehta@amd.com>
Tested-by: Ravulapati Vishnu vardhan Rao <Vishnuvardhanrao.Ravulapati@amd.com>
Signed-off-by: Vijendar Mukunda <vijendar.mukunda@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/raven/acp3x.h

+#include "chip_offset_byte.h"
+
+#define ACP3x_PHY_BASE_ADDRESS 0x1240000
+
+static inline u32 rv_readl(void __iomem *base_addr)
+{
+	return readl(base_addr - ACP3x_PHY_BASE_ADDRESS);
+}
+
+static inline void rv_writel(u32 val, void __iomem *base_addr)
+{
+	writel(val, base_addr - ACP3x_PHY_BASE_ADDRESS);
+}

sound/soc/amd/raven/pci-acp3x.c

+/*
+ * AMD ALSA SoC PCM Driver
+ *
+ * Copyright 2016 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/io.h>
+
+#include "acp3x.h"
+
+struct acp3x_dev_data {
+	void __iomem *acp3x_base;
+};
+
+static int snd_acp3x_probe(struct pci_dev *pci,
+			   const struct pci_device_id *pci_id)
+{
+	int ret;
+	u32 addr;
+	struct acp3x_dev_data *adata;
+
+	if (pci_enable_device(pci)) {
+		dev_err(&pci->dev, "pci_enable_device failed\n");
+		return -ENODEV;
+	}
+
+	ret = pci_request_regions(pci, "AMD ACP3x audio");
+	if (ret < 0) {
+		dev_err(&pci->dev, "pci_request_regions failed\n");
+		goto disable_pci;
+	}
+
+	adata = devm_kzalloc(&pci->dev, sizeof(struct acp3x_dev_data),
+			     GFP_KERNEL);
+	if (!adata) {
+		ret = -ENOMEM;
+		goto release_regions;
+	}
+
+	addr = pci_resource_start(pci, 0);
+	adata->acp3x_base = ioremap(addr, pci_resource_len(pci, 0));
+	if (!adata->acp3x_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_acp3x_remove(struct pci_dev *pci)
+{
+	struct acp3x_dev_data *adata = pci_get_drvdata(pci);
+
+	iounmap(adata->acp3x_base);
+	pci_release_regions(pci);
+	pci_disable_device(pci);
+}
+
+static const struct pci_device_id snd_acp3x_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x15e2),
+	.class = PCI_CLASS_MULTIMEDIA_OTHER << 8,
+	.class_mask = 0xffffff },
+	{ 0, },
+};
+MODULE_DEVICE_TABLE(pci, snd_acp3x_ids);
+
+static struct pci_driver acp3x_driver  = {
+	.name = KBUILD_MODNAME,
+	.id_table = snd_acp3x_ids,
+	.probe = snd_acp3x_probe,
+	.remove = snd_acp3x_remove,
+};
+
+module_pci_driver(acp3x_driver);
+
+MODULE_AUTHOR("Maruthi.Bayyavarapu@amd.com");
+MODULE_DESCRIPTION("AMD ACP3x PCI driver");
+MODULE_LICENSE("GPL v2");