Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 449 insertions, 0 deletions

diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
new file mode 100644
index 000000000..b6be73034
--- /dev/null
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -0,0 +1,449 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
+ *
+ * Description: CoreSight Replicator driver
+ */
+
+#include <linux/acpi.h>
+#include <linux/amba/bus.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/property.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/coresight.h>
+
+#include "coresight-priv.h"
+
+#define REPLICATOR_IDFILTER0		0x000
+#define REPLICATOR_IDFILTER1		0x004
+
+DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
+
+/**
+ * struct replicator_drvdata - specifics associated to a replicator component
+ * @base:	memory mapped base address for this component. Also indicates
+ *		whether this one is programmable or not.
+ * @atclk:	optional clock for the core parts of the replicator.
+ * @csdev:	component vitals needed by the framework
+ * @spinlock:	serialize enable/disable operations.
+ * @check_idfilter_val: check if the context is lost upon clock removal.
+ */
+struct replicator_drvdata {
+	void __iomem		*base;
+	struct clk		*atclk;
+	struct coresight_device	*csdev;
+	spinlock_t		spinlock;
+	bool			check_idfilter_val;
+};
+
+static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)
+{
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(drvdata->base);
+
+	if (!coresight_claim_device_unlocked(csdev)) {
+		writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
+		writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
+		coresight_disclaim_device_unlocked(csdev);
+	}
+
+	CS_LOCK(drvdata->base);
+}
+
+/*
+ * replicator_reset : Reset the replicator configuration to sane values.
+ */
+static inline void replicator_reset(struct replicator_drvdata *drvdata)
+{
+	if (drvdata->base)
+		dynamic_replicator_reset(drvdata);
+}
+
+static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
+				     int inport, int outport)
+{
+	int rc = 0;
+	u32 id0val, id1val;
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(drvdata->base);
+
+	id0val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0);
+	id1val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1);
+
+	/*
+	 * Some replicator designs lose context when AMBA clocks are removed,
+	 * so have a check for this.
+	 */
+	if (drvdata->check_idfilter_val && id0val == 0x0 && id1val == 0x0)
+		id0val = id1val = 0xff;
+
+	if (id0val == 0xff && id1val == 0xff)
+		rc = coresight_claim_device_unlocked(csdev);
+
+	if (!rc) {
+		switch (outport) {
+		case 0:
+			id0val = 0x0;
+			break;
+		case 1:
+			id1val = 0x0;
+			break;
+		default:
+			WARN_ON(1);
+			rc = -EINVAL;
+		}
+	}
+
+	/* Ensure that the outport is enabled. */
+	if (!rc) {
+		writel_relaxed(id0val, drvdata->base + REPLICATOR_IDFILTER0);
+		writel_relaxed(id1val, drvdata->base + REPLICATOR_IDFILTER1);
+	}
+
+	CS_LOCK(drvdata->base);
+
+	return rc;
+}
+
+static int replicator_enable(struct coresight_device *csdev,
+			     struct coresight_connection *in,
+			     struct coresight_connection *out)
+{
+	int rc = 0;
+	struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+	unsigned long flags;
+	bool first_enable = false;
+
+	spin_lock_irqsave(&drvdata->spinlock, flags);
+	if (atomic_read(&out->src_refcnt) == 0) {
+		if (drvdata->base)
+			rc = dynamic_replicator_enable(drvdata, in->dest_port,
+						       out->src_port);
+		if (!rc)
+			first_enable = true;
+	}
+	if (!rc)
+		atomic_inc(&out->src_refcnt);
+	spin_unlock_irqrestore(&drvdata->spinlock, flags);
+
+	if (first_enable)
+		dev_dbg(&csdev->dev, "REPLICATOR enabled\n");
+	return rc;
+}
+
+static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
+				       int inport, int outport)
+{
+	u32 reg;
+	struct coresight_device *csdev = drvdata->csdev;
+
+	switch (outport) {
+	case 0:
+		reg = REPLICATOR_IDFILTER0;
+		break;
+	case 1:
+		reg = REPLICATOR_IDFILTER1;
+		break;
+	default:
+		WARN_ON(1);
+		return;
+	}
+
+	CS_UNLOCK(drvdata->base);
+
+	/* disable the flow of ATB data through port */
+	writel_relaxed(0xff, drvdata->base + reg);
+
+	if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
+	    (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
+		coresight_disclaim_device_unlocked(csdev);
+	CS_LOCK(drvdata->base);
+}
+
+static void replicator_disable(struct coresight_device *csdev,
+			       struct coresight_connection *in,
+			       struct coresight_connection *out)
+{
+	struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+	unsigned long flags;
+	bool last_disable = false;
+
+	spin_lock_irqsave(&drvdata->spinlock, flags);
+	if (atomic_dec_return(&out->src_refcnt) == 0) {
+		if (drvdata->base)
+			dynamic_replicator_disable(drvdata, in->dest_port,
+						   out->src_port);
+		last_disable = true;
+	}
+	spin_unlock_irqrestore(&drvdata->spinlock, flags);
+
+	if (last_disable)
+		dev_dbg(&csdev->dev, "REPLICATOR disabled\n");
+}
+
+static const struct coresight_ops_link replicator_link_ops = {
+	.enable		= replicator_enable,
+	.disable	= replicator_disable,
+};
+
+static const struct coresight_ops replicator_cs_ops = {
+	.link_ops	= &replicator_link_ops,
+};
+
+static struct attribute *replicator_mgmt_attrs[] = {
+	coresight_simple_reg32(idfilter0, REPLICATOR_IDFILTER0),
+	coresight_simple_reg32(idfilter1, REPLICATOR_IDFILTER1),
+	NULL,
+};
+
+static const struct attribute_group replicator_mgmt_group = {
+	.attrs = replicator_mgmt_attrs,
+	.name = "mgmt",
+};
+
+static const struct attribute_group *replicator_groups[] = {
+	&replicator_mgmt_group,
+	NULL,
+};
+
+static int replicator_probe(struct device *dev, struct resource *res)
+{
+	int ret = 0;
+	struct coresight_platform_data *pdata = NULL;
+	struct replicator_drvdata *drvdata;
+	struct coresight_desc desc = { 0 };
+	void __iomem *base;
+
+	if (is_of_node(dev_fwnode(dev)) &&
+	    of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
+		dev_warn_once(dev,
+			      "Uses OBSOLETE CoreSight replicator binding\n");
+
+	desc.name = coresight_alloc_device_name(&replicator_devs, dev);
+	if (!desc.name)
+		return -ENOMEM;
+
+	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
+	if (!IS_ERR(drvdata->atclk)) {
+		ret = clk_prepare_enable(drvdata->atclk);
+		if (ret)
+			return ret;
+	}
+
+	/*
+	 * Map the device base for dynamic-replicator, which has been
+	 * validated by AMBA core
+	 */
+	if (res) {
+		base = devm_ioremap_resource(dev, res);
+		if (IS_ERR(base)) {
+			ret = PTR_ERR(base);
+			goto out_disable_clk;
+		}
+		drvdata->base = base;
+		desc.groups = replicator_groups;
+		desc.access = CSDEV_ACCESS_IOMEM(base);
+	}
+
+	if (fwnode_property_present(dev_fwnode(dev),
+				    "qcom,replicator-loses-context"))
+		drvdata->check_idfilter_val = true;
+
+	dev_set_drvdata(dev, drvdata);
+
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto out_disable_clk;
+	}
+	dev->platform_data = pdata;
+
+	spin_lock_init(&drvdata->spinlock);
+	desc.type = CORESIGHT_DEV_TYPE_LINK;
+	desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
+	desc.ops = &replicator_cs_ops;
+	desc.pdata = dev->platform_data;
+	desc.dev = dev;
+
+	drvdata->csdev = coresight_register(&desc);
+	if (IS_ERR(drvdata->csdev)) {
+		ret = PTR_ERR(drvdata->csdev);
+		goto out_disable_clk;
+	}
+
+	replicator_reset(drvdata);
+	pm_runtime_put(dev);
+
+out_disable_clk:
+	if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
+		clk_disable_unprepare(drvdata->atclk);
+	return ret;
+}
+
+static int replicator_remove(struct device *dev)
+{
+	struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
+
+	coresight_unregister(drvdata->csdev);
+	return 0;
+}
+
+static int static_replicator_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	pm_runtime_get_noresume(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	/* Static replicators do not have programming base */
+	ret = replicator_probe(&pdev->dev, NULL);
+
+	if (ret) {
+		pm_runtime_put_noidle(&pdev->dev);
+		pm_runtime_disable(&pdev->dev);
+	}
+
+	return ret;
+}
+
+static int static_replicator_remove(struct platform_device *pdev)
+{
+	replicator_remove(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int replicator_runtime_suspend(struct device *dev)
+{
+	struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
+
+	if (drvdata && !IS_ERR(drvdata->atclk))
+		clk_disable_unprepare(drvdata->atclk);
+
+	return 0;
+}
+
+static int replicator_runtime_resume(struct device *dev)
+{
+	struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
+
+	if (drvdata && !IS_ERR(drvdata->atclk))
+		clk_prepare_enable(drvdata->atclk);
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops replicator_dev_pm_ops = {
+	SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
+			   replicator_runtime_resume, NULL)
+};
+
+static const struct of_device_id static_replicator_match[] = {
+	{.compatible = "arm,coresight-replicator"},
+	{.compatible = "arm,coresight-static-replicator"},
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, static_replicator_match);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id static_replicator_acpi_ids[] = {
+	{"ARMHC985", 0}, /* ARM CoreSight Static Replicator */
+	{}
+};
+
+MODULE_DEVICE_TABLE(acpi, static_replicator_acpi_ids);
+#endif
+
+static struct platform_driver static_replicator_driver = {
+	.probe          = static_replicator_probe,
+	.remove         = static_replicator_remove,
+	.driver         = {
+		.name   = "coresight-static-replicator",
+		/* THIS_MODULE is taken care of by platform_driver_register() */
+		.of_match_table = of_match_ptr(static_replicator_match),
+		.acpi_match_table = ACPI_PTR(static_replicator_acpi_ids),
+		.pm	= &replicator_dev_pm_ops,
+		.suppress_bind_attrs = true,
+	},
+};
+
+static int dynamic_replicator_probe(struct amba_device *adev,
+				    const struct amba_id *id)
+{
+	return replicator_probe(&adev->dev, &adev->res);
+}
+
+static void dynamic_replicator_remove(struct amba_device *adev)
+{
+	replicator_remove(&adev->dev);
+}
+
+static const struct amba_id dynamic_replicator_ids[] = {
+	CS_AMBA_ID(0x000bb909),
+	CS_AMBA_ID(0x000bb9ec),		/* Coresight SoC-600 */
+	{},
+};
+
+MODULE_DEVICE_TABLE(amba, dynamic_replicator_ids);
+
+static struct amba_driver dynamic_replicator_driver = {
+	.drv = {
+		.name	= "coresight-dynamic-replicator",
+		.pm	= &replicator_dev_pm_ops,
+		.owner	= THIS_MODULE,
+		.suppress_bind_attrs = true,
+	},
+	.probe		= dynamic_replicator_probe,
+	.remove         = dynamic_replicator_remove,
+	.id_table	= dynamic_replicator_ids,
+};
+
+static int __init replicator_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&static_replicator_driver);
+	if (ret) {
+		pr_info("Error registering platform driver\n");
+		return ret;
+	}
+
+	ret = amba_driver_register(&dynamic_replicator_driver);
+	if (ret) {
+		pr_info("Error registering amba driver\n");
+		platform_driver_unregister(&static_replicator_driver);
+	}
+
+	return ret;
+}
+
+static void __exit replicator_exit(void)
+{
+	platform_driver_unregister(&static_replicator_driver);
+	amba_driver_unregister(&dynamic_replicator_driver);
+}
+
+module_init(replicator_init);
+module_exit(replicator_exit);
+
+MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
+MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
+MODULE_DESCRIPTION("Arm CoreSight Replicator Driver");
+MODULE_LICENSE("GPL v2");