ASoC: amd: acp: Add generic PCI driver module for ACP device

Audio Co-processor or ACP IP block on AMD's SOC is connected via
PCI bus interface, hence needs to be register as a PCI device. We
have same PCI device ID across multiple SOC's but with different
revision id for PCI hw. Add a generic PCI driver module for ACP
that registers ACP as a PCI device and also register a platform
device based on pci revision id. Any SOC's specific configuration
for ACP block will be done in platform driver probe. We have added
an initial support for ACP revision id 3 or ACP3X device.

Signed-off-by: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>
Link: https://lore.kernel.org/r/20220117115854.455995-4-AjitKumar.Pandey@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 160 insertions, 0 deletions

diff --git a/sound/soc/amd/acp/acp-pci.c b/sound/soc/amd/acp/acp-pci.c
new file mode 100644
index 000000000000..340e39d7f420
--- /dev/null
+++ b/sound/soc/amd/acp/acp-pci.c
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+//
+// This file is provided under a dual BSD/GPLv2 license. When using or
+// redistributing this file, you may do so under either license.
+//
+// Copyright(c) 2022 Advanced Micro Devices, Inc. All rights reserved.
+//
+// Authors: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>
+
+/*
+ * Generic PCI interface for ACP device
+ */
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "amd.h"
+#include "../mach-config.h"
+
+#define DRV_NAME "acp_pci"
+
+#define ACP3x_REG_START	0x1240000
+#define ACP3x_REG_END	0x125C000
+
+static struct platform_device *dmic_dev;
+static struct platform_device *pdev;
+
+static const struct resource acp3x_res[] = {
+	{
+		.start = 0,
+		.end = ACP3x_REG_END - ACP3x_REG_START,
+		.name = "acp_mem",
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.start = 0,
+		.end = 0,
+		.name = "acp_dai_irq",
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
+static int acp_pci_probe(struct pci_dev *pci, const struct pci_device_id *pci_id)
+{
+	struct platform_device_info pdevinfo;
+	struct device *dev = &pci->dev;
+	const struct resource *res_acp;
+	struct acp_chip_info *chip;
+	struct resource *res;
+	unsigned int flag, addr, num_res, i;
+	int ret;
+
+	flag = snd_amd_acp_find_config(pci);
+	if (flag != FLAG_AMD_LEGACY)
+		return -ENODEV;
+
+	chip = devm_kzalloc(&pci->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	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");
+		return -ENOMEM;
+	}
+
+	pci_set_master(pci);
+
+	switch (pci->revision) {
+	case 0x01:
+		res_acp = acp3x_res;
+		num_res = ARRAY_SIZE(acp3x_res);
+		chip->name = "acp_asoc_renoir";
+		chip->acp_rev = ACP3X_DEV;
+		break;
+	default:
+		dev_err(dev, "Unsupported device revision:0x%x\n", pci->revision);
+		return -EINVAL;
+	}
+
+	dmic_dev = platform_device_register_data(dev, "dmic-codec", PLATFORM_DEVID_NONE, NULL, 0);
+	if (IS_ERR(dmic_dev)) {
+		dev_err(dev, "failed to create DMIC device\n");
+		return PTR_ERR(dmic_dev);
+	}
+
+	addr = pci_resource_start(pci, 0);
+	chip->base = devm_ioremap(&pci->dev, addr, pci_resource_len(pci, 0));
+
+	res = devm_kzalloc(&pci->dev, sizeof(struct resource) * num_res, GFP_KERNEL);
+	if (!res) {
+		platform_device_unregister(dmic_dev);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < num_res; i++, res_acp++) {
+		res[i].name = res_acp->name;
+		res[i].flags = res_acp->flags;
+		res[i].start = addr + res_acp->start;
+		res[i].end = addr + res_acp->end;
+		if (res_acp->flags == IORESOURCE_IRQ) {
+			res[i].start = pci->irq;
+			res[i].end = res[i].start;
+		}
+	}
+
+	memset(&pdevinfo, 0, sizeof(pdevinfo));
+
+	pdevinfo.name = chip->name;
+	pdevinfo.id = 0;
+	pdevinfo.parent = &pci->dev;
+	pdevinfo.num_res = num_res;
+	pdevinfo.res = &res[0];
+	pdevinfo.data = chip;
+	pdevinfo.size_data = sizeof(*chip);
+
+	pdev = platform_device_register_full(&pdevinfo);
+	if (IS_ERR(pdev)) {
+		dev_err(&pci->dev, "cannot register %s device\n", pdevinfo.name);
+		platform_device_unregister(dmic_dev);
+		ret = PTR_ERR(pdev);
+	}
+
+	return ret;
+};
+
+static void acp_pci_remove(struct pci_dev *pci)
+{
+	if (dmic_dev)
+		platform_device_unregister(dmic_dev);
+	if (pdev)
+		platform_device_unregister(pdev);
+}
+
+/* PCI IDs */
+static const struct pci_device_id acp_pci_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_PCI_DEV_ID)},
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, acp_pci_ids);
+
+/* pci_driver definition */
+static struct pci_driver snd_amd_acp_pci_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = acp_pci_ids,
+	.probe = acp_pci_probe,
+	.remove = acp_pci_remove,
+};
+module_pci_driver(snd_amd_acp_pci_driver);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS(DRV_NAME);