1 files changed, 344 insertions, 0 deletions

diff --git a/sound/soc/amd/renoir/rn-pci-acp3x.c b/sound/soc/amd/renoir/rn-pci-acp3x.c
new file mode 100644
index 000000000000..859ed67b93cf
--- /dev/null
+++ b/sound/soc/amd/renoir/rn-pci-acp3x.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// AMD Renoir ACP PCI Driver
+//
+//Copyright 2020 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 <linux/interrupt.h>
+#include <linux/pm_runtime.h>
+
+#include "rn_acp3x.h"
+
+static int acp_power_gating;
+module_param(acp_power_gating, int, 0644);
+MODULE_PARM_DESC(acp_power_gating, "Enable acp power gating");
+
+struct acp_dev_data {
+	void __iomem *acp_base;
+	struct resource *res;
+	struct platform_device *pdev[ACP_DEVS];
+};
+
+static int rn_acp_power_on(void __iomem *acp_base)
+{
+	u32 val;
+	int timeout;
+
+	val = rn_readl(acp_base + ACP_PGFSM_STATUS);
+
+	if (val == 0)
+		return val;
+
+	if ((val & ACP_PGFSM_STATUS_MASK) !=
+				ACP_POWER_ON_IN_PROGRESS)
+		rn_writel(ACP_PGFSM_CNTL_POWER_ON_MASK,
+			  acp_base + ACP_PGFSM_CONTROL);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = rn_readl(acp_base + ACP_PGFSM_STATUS);
+		if (!val)
+			return 0;
+		udelay(1);
+	}
+	return -ETIMEDOUT;
+}
+
+static int rn_acp_power_off(void __iomem *acp_base)
+{
+	u32 val;
+	int timeout;
+
+	rn_writel(ACP_PGFSM_CNTL_POWER_OFF_MASK,
+		  acp_base + ACP_PGFSM_CONTROL);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = rn_readl(acp_base + ACP_PGFSM_STATUS);
+		if ((val & ACP_PGFSM_STATUS_MASK) == ACP_POWERED_OFF)
+			return 0;
+		udelay(1);
+	}
+	return -ETIMEDOUT;
+}
+
+static int rn_acp_reset(void __iomem *acp_base)
+{
+	u32 val;
+	int timeout;
+
+	rn_writel(1, acp_base + ACP_SOFT_RESET);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = rn_readl(acp_base + ACP_SOFT_RESET);
+		if (val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK)
+			break;
+		cpu_relax();
+	}
+	rn_writel(0, acp_base + ACP_SOFT_RESET);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = rn_readl(acp_base + ACP_SOFT_RESET);
+		if (!val)
+			return 0;
+		cpu_relax();
+	}
+	return -ETIMEDOUT;
+}
+
+static void rn_acp_enable_interrupts(void __iomem *acp_base)
+{
+	u32 ext_intr_ctrl;
+
+	rn_writel(0x01, acp_base + ACP_EXTERNAL_INTR_ENB);
+	ext_intr_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
+	ext_intr_ctrl |= ACP_ERROR_MASK;
+	rn_writel(ext_intr_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
+}
+
+static void rn_acp_disable_interrupts(void __iomem *acp_base)
+{
+	rn_writel(ACP_EXT_INTR_STAT_CLEAR_MASK, acp_base +
+		  ACP_EXTERNAL_INTR_STAT);
+	rn_writel(0x00, acp_base + ACP_EXTERNAL_INTR_ENB);
+}
+
+static int rn_acp_init(void __iomem *acp_base)
+{
+	int ret;
+
+	/* power on */
+	ret = rn_acp_power_on(acp_base);
+	if (ret) {
+		pr_err("ACP power on failed\n");
+		return ret;
+	}
+	rn_writel(0x01, acp_base + ACP_CONTROL);
+	/* Reset */
+	ret = rn_acp_reset(acp_base);
+	if (ret) {
+		pr_err("ACP reset failed\n");
+		return ret;
+	}
+	rn_writel(0x03, acp_base + ACP_CLKMUX_SEL);
+	rn_acp_enable_interrupts(acp_base);
+	return 0;
+}
+
+static int rn_acp_deinit(void __iomem *acp_base)
+{
+	int ret;
+
+	rn_acp_disable_interrupts(acp_base);
+	/* Reset */
+	ret = rn_acp_reset(acp_base);
+	if (ret) {
+		pr_err("ACP reset failed\n");
+		return ret;
+	}
+	rn_writel(0x00, acp_base + ACP_CLKMUX_SEL);
+	rn_writel(0x00, acp_base + ACP_CONTROL);
+	/* power off */
+	if (acp_power_gating) {
+		ret = rn_acp_power_off(acp_base);
+		if (ret) {
+			pr_err("ACP power off failed\n");
+			return ret;
+		}
+	}
+	return 0;
+}
+
+static int snd_rn_acp_probe(struct pci_dev *pci,
+			    const struct pci_device_id *pci_id)
+{
+	struct acp_dev_data *adata;
+	struct platform_device_info pdevinfo[ACP_DEVS];
+	unsigned int irqflags;
+	int ret, index;
+	u32 addr;
+
+	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 acp_dev_data),
+			     GFP_KERNEL);
+	if (!adata) {
+		ret = -ENOMEM;
+		goto release_regions;
+	}
+
+	/* check for msi interrupt support */
+	ret = pci_enable_msi(pci);
+	if (ret)
+		/* msi is not enabled */
+		irqflags = IRQF_SHARED;
+	else
+		/* msi is enabled */
+		irqflags = 0;
+
+	addr = pci_resource_start(pci, 0);
+	adata->acp_base = devm_ioremap(&pci->dev, addr,
+				       pci_resource_len(pci, 0));
+	if (!adata->acp_base) {
+		ret = -ENOMEM;
+		goto disable_msi;
+	}
+	pci_set_master(pci);
+	pci_set_drvdata(pci, adata);
+	ret = rn_acp_init(adata->acp_base);
+	if (ret)
+		goto disable_msi;
+
+	adata->res = devm_kzalloc(&pci->dev,
+				  sizeof(struct resource) * 2,
+				  GFP_KERNEL);
+	if (!adata->res) {
+		ret = -ENOMEM;
+		goto de_init;
+	}
+
+	adata->res[0].name = "acp_pdm_iomem";
+	adata->res[0].flags = IORESOURCE_MEM;
+	adata->res[0].start = addr;
+	adata->res[0].end = addr + (ACP_REG_END - ACP_REG_START);
+	adata->res[1].name = "acp_pdm_irq";
+	adata->res[1].flags = IORESOURCE_IRQ;
+	adata->res[1].start = pci->irq;
+	adata->res[1].end = pci->irq;
+
+	memset(&pdevinfo, 0, sizeof(pdevinfo));
+	pdevinfo[0].name = "acp_rn_pdm_dma";
+	pdevinfo[0].id = 0;
+	pdevinfo[0].parent = &pci->dev;
+	pdevinfo[0].num_res = 2;
+	pdevinfo[0].res = adata->res;
+	pdevinfo[0].data = &irqflags;
+	pdevinfo[0].size_data = sizeof(irqflags);
+
+	pdevinfo[1].name = "dmic-codec";
+	pdevinfo[1].id = 0;
+	pdevinfo[1].parent = &pci->dev;
+	pdevinfo[2].name = "acp_pdm_mach";
+	pdevinfo[2].id = 0;
+	pdevinfo[2].parent = &pci->dev;
+	for (index = 0; index < ACP_DEVS; index++) {
+		adata->pdev[index] =
+				platform_device_register_full(&pdevinfo[index]);
+		if (IS_ERR(adata->pdev[index])) {
+			dev_err(&pci->dev, "cannot register %s device\n",
+				pdevinfo[index].name);
+			ret = PTR_ERR(adata->pdev[index]);
+			goto unregister_devs;
+		}
+	}
+	pm_runtime_set_autosuspend_delay(&pci->dev, ACP_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(&pci->dev);
+	pm_runtime_put_noidle(&pci->dev);
+	pm_runtime_allow(&pci->dev);
+	return 0;
+
+unregister_devs:
+	for (index = 0; index < ACP_DEVS; index++)
+		platform_device_unregister(adata->pdev[index]);
+de_init:
+	if (rn_acp_deinit(adata->acp_base))
+		dev_err(&pci->dev, "ACP de-init failed\n");
+disable_msi:
+	pci_disable_msi(pci);
+release_regions:
+	pci_release_regions(pci);
+disable_pci:
+	pci_disable_device(pci);
+
+	return ret;
+}
+
+static int snd_rn_acp_suspend(struct device *dev)
+{
+	int ret;
+	struct acp_dev_data *adata;
+
+	adata = dev_get_drvdata(dev);
+	ret = rn_acp_deinit(adata->acp_base);
+	if (ret)
+		dev_err(dev, "ACP de-init failed\n");
+	else
+		dev_dbg(dev, "ACP de-initialized\n");
+
+	return ret;
+}
+
+static int snd_rn_acp_resume(struct device *dev)
+{
+	int ret;
+	struct acp_dev_data *adata;
+
+	adata = dev_get_drvdata(dev);
+	ret = rn_acp_init(adata->acp_base);
+	if (ret) {
+		dev_err(dev, "ACP init failed\n");
+		return ret;
+	}
+	return 0;
+}
+
+static const struct dev_pm_ops rn_acp_pm = {
+	.runtime_suspend = snd_rn_acp_suspend,
+	.runtime_resume =  snd_rn_acp_resume,
+	.suspend = snd_rn_acp_suspend,
+	.resume =	snd_rn_acp_resume,
+};
+
+static void snd_rn_acp_remove(struct pci_dev *pci)
+{
+	struct acp_dev_data *adata;
+	int ret, index;
+
+	adata = pci_get_drvdata(pci);
+	for (index = 0; index < ACP_DEVS; index++)
+		platform_device_unregister(adata->pdev[index]);
+	ret = rn_acp_deinit(adata->acp_base);
+	if (ret)
+		dev_err(&pci->dev, "ACP de-init failed\n");
+	pm_runtime_forbid(&pci->dev);
+	pm_runtime_get_noresume(&pci->dev);
+	pci_disable_msi(pci);
+	pci_release_regions(pci);
+	pci_disable_device(pci);
+}
+
+static const struct pci_device_id snd_rn_acp_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_rn_acp_ids);
+
+static struct pci_driver rn_acp_driver  = {
+	.name = KBUILD_MODNAME,
+	.id_table = snd_rn_acp_ids,
+	.probe = snd_rn_acp_probe,
+	.remove = snd_rn_acp_remove,
+	.driver = {
+		.pm = &rn_acp_pm,
+	}
+};
+
+module_pci_driver(rn_acp_driver);
+
+MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
+MODULE_DESCRIPTION("AMD ACP Renoir PCI driver");
+MODULE_LICENSE("GPL v2");