drivers/hwtracing/coresight/coresight-funnel.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
  *
  * Description: CoreSight Funnel driver
  */

 #include <linux/acpi.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/coresight.h>
 #include <linux/amba/bus.h>
 #include <linux/clk.h>

 #include "coresight-priv.h"

 #define FUNNEL_FUNCTL		0x000
 #define FUNNEL_PRICTL		0x004

 #define FUNNEL_HOLDTIME_MASK	0xf00
 #define FUNNEL_HOLDTIME_SHFT	0x8
 #define FUNNEL_HOLDTIME		(0x7 << FUNNEL_HOLDTIME_SHFT)
 #define FUNNEL_ENSx_MASK	0xff

 DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");

 /**
  * struct funnel_drvdata - specifics associated to a funnel component
  * @base:	memory mapped base address for this component.
  * @atclk:	optional clock for the core parts of the funnel.
  * @csdev:	component vitals needed by the framework.
  * @priority:	port selection order.
  * @spinlock:	serialize enable/disable operations.
  */
 struct funnel_drvdata {
 	void __iomem		*base;
 	struct clk		*atclk;
 	struct coresight_device	*csdev;
 	unsigned long		priority;
 	spinlock_t		spinlock;
 };

 static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
 {
 	u32 functl;
 	int rc = 0;

 	CS_UNLOCK(drvdata->base);

 	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 	/* Claim the device only when we enable the first slave */
 	if (!(functl & FUNNEL_ENSx_MASK)) {
 		rc = coresight_claim_device_unlocked(drvdata->base);
 		if (rc)
 			goto done;
 	}

 	functl &= ~FUNNEL_HOLDTIME_MASK;
 	functl |= FUNNEL_HOLDTIME;
 	functl |= (1 << port);
 	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
 	writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
 done:
 	CS_LOCK(drvdata->base);
 	return rc;
 }

 static int funnel_enable(struct coresight_device *csdev, int inport,
 			 int outport)
 {
 	int rc = 0;
 	struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 	unsigned long flags;
 	bool first_enable = false;

 	spin_lock_irqsave(&drvdata->spinlock, flags);
 	if (atomic_read(&csdev->refcnt[inport]) == 0) {
 		if (drvdata->base)
 			rc = dynamic_funnel_enable_hw(drvdata, inport);
 		if (!rc)
 			first_enable = true;
 	}
 	if (!rc)
 		atomic_inc(&csdev->refcnt[inport]);
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);

 	if (first_enable)
 		dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n", inport);
 	return rc;
 }

 static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
 				      int inport)
 {
 	u32 functl;

 	CS_UNLOCK(drvdata->base);

 	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 	functl &= ~(1 << inport);
 	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);

 	/* Disclaim the device if none of the slaves are now active */
 	if (!(functl & FUNNEL_ENSx_MASK))
 		coresight_disclaim_device_unlocked(drvdata->base);

 	CS_LOCK(drvdata->base);
 }

 static void funnel_disable(struct coresight_device *csdev, int inport,
 			   int outport)
 {
 	struct funnel_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(&csdev->refcnt[inport]) == 0) {
 		if (drvdata->base)
 			dynamic_funnel_disable_hw(drvdata, inport);
 		last_disable = true;
 	}
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);

 	if (last_disable)
 		dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n", inport);
 }

 static const struct coresight_ops_link funnel_link_ops = {
 	.enable		= funnel_enable,
 	.disable	= funnel_disable,
 };

 static const struct coresight_ops funnel_cs_ops = {
 	.link_ops	= &funnel_link_ops,
 };

 static ssize_t priority_show(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
 	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 	unsigned long val = drvdata->priority;

 	return sprintf(buf, "%#lx\n", val);
 }

 static ssize_t priority_store(struct device *dev,
 			      struct device_attribute *attr,
 			      const char *buf, size_t size)
 {
 	int ret;
 	unsigned long val;
 	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);

 	ret = kstrtoul(buf, 16, &val);
 	if (ret)
 		return ret;

 	drvdata->priority = val;
 	return size;
 }
 static DEVICE_ATTR_RW(priority);

 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
 {
 	u32 functl;

 	CS_UNLOCK(drvdata->base);
 	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 	CS_LOCK(drvdata->base);

 	return functl;
 }

 static ssize_t funnel_ctrl_show(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
 	u32 val;
 	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);

 	pm_runtime_get_sync(dev->parent);

 	val = get_funnel_ctrl_hw(drvdata);

 	pm_runtime_put(dev->parent);

 	return sprintf(buf, "%#x\n", val);
 }
 static DEVICE_ATTR_RO(funnel_ctrl);

 static struct attribute *coresight_funnel_attrs[] = {
 	&dev_attr_funnel_ctrl.attr,
 	&dev_attr_priority.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(coresight_funnel);

 static int funnel_probe(struct device *dev, struct resource *res)
 {
 	int ret;
 	void __iomem *base;
 	struct coresight_platform_data *pdata = NULL;
 	struct funnel_drvdata *drvdata;
 	struct coresight_desc desc = { 0 };

 	if (is_of_node(dev_fwnode(dev)) &&
 	    of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
 		dev_warn_once(dev, "Uses OBSOLETE CoreSight funnel binding\n");

 	desc.name = coresight_alloc_device_name(&funnel_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-funnel, 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 = coresight_funnel_groups;
 	}

 	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_MERG;
 	desc.ops = &funnel_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
 		ret = PTR_ERR(drvdata->csdev);
 		goto out_disable_clk;
 	}

 	pm_runtime_put(dev);
 	ret = 0;

 out_disable_clk:
 	if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
 		clk_disable_unprepare(drvdata->atclk);
 	return ret;
 }

 #ifdef CONFIG_PM
 static int funnel_runtime_suspend(struct device *dev)
 {
 	struct funnel_drvdata *drvdata = dev_get_drvdata(dev);

 	if (drvdata && !IS_ERR(drvdata->atclk))
 		clk_disable_unprepare(drvdata->atclk);

 	return 0;
 }

 static int funnel_runtime_resume(struct device *dev)
 {
 	struct funnel_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 funnel_dev_pm_ops = {
 	SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
 };

 static int static_funnel_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 funnel do not have programming base */
 	ret = funnel_probe(&pdev->dev, NULL);

 	if (ret) {
 		pm_runtime_put_noidle(&pdev->dev);
 		pm_runtime_disable(&pdev->dev);
 	}

 	return ret;
 }

 static const struct of_device_id static_funnel_match[] = {
 	{.compatible = "arm,coresight-static-funnel"},
 	{}
 };

 #ifdef CONFIG_ACPI
 static const struct acpi_device_id static_funnel_ids[] = {
 	{"ARMHC9FE", 0},
 	{},
 };
 #endif

 static struct platform_driver static_funnel_driver = {
 	.probe          = static_funnel_probe,
 	.driver         = {
 		.name   = "coresight-static-funnel",
 		.of_match_table = static_funnel_match,
 		.acpi_match_table = ACPI_PTR(static_funnel_ids),
 		.pm	= &funnel_dev_pm_ops,
 		.suppress_bind_attrs = true,
 	},
 };
 builtin_platform_driver(static_funnel_driver);

 static int dynamic_funnel_probe(struct amba_device *adev,
 				const struct amba_id *id)
 {
 	return funnel_probe(&adev->dev, &adev->res);
 }

 static const struct amba_id dynamic_funnel_ids[] = {
 	{
 		.id     = 0x000bb908,
 		.mask   = 0x000fffff,
 	},
 	{
 		/* Coresight SoC-600 */
 		.id     = 0x000bb9eb,
 		.mask   = 0x000fffff,
 	},
 	{ 0, 0},
 };

 static struct amba_driver dynamic_funnel_driver = {
 	.drv = {
 		.name	= "coresight-dynamic-funnel",
 		.owner	= THIS_MODULE,
 		.pm	= &funnel_dev_pm_ops,
 		.suppress_bind_attrs = true,
 	},
 	.probe		= dynamic_funnel_probe,
 	.id_table	= dynamic_funnel_ids,
 };
 builtin_amba_driver(dynamic_funnel_driver);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
	*
	* Description: CoreSight Funnel driver
	*/

	#include <linux/acpi.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/fs.h>
	#include <linux/slab.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>
	#include <linux/coresight.h>
	#include <linux/amba/bus.h>
	#include <linux/clk.h>

	#include "coresight-priv.h"

	#define FUNNEL_FUNCTL 0x000
	#define FUNNEL_PRICTL 0x004

	#define FUNNEL_HOLDTIME_MASK 0xf00
	#define FUNNEL_HOLDTIME_SHFT 0x8
	#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
	#define FUNNEL_ENSx_MASK 0xff

	DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");

	/**
	* struct funnel_drvdata - specifics associated to a funnel component
	* @base: memory mapped base address for this component.
	* @atclk: optional clock for the core parts of the funnel.
	* @csdev: component vitals needed by the framework.
	* @priority: port selection order.
	* @spinlock: serialize enable/disable operations.
	*/
	struct funnel_drvdata {
	void __iomem *base;
	struct clk *atclk;
	struct coresight_device *csdev;
	unsigned long priority;
	spinlock_t spinlock;
	};

	static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
	{
	u32 functl;
	int rc = 0;

	CS_UNLOCK(drvdata->base);

	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
	/* Claim the device only when we enable the first slave */
	if (!(functl & FUNNEL_ENSx_MASK)) {
	rc = coresight_claim_device_unlocked(drvdata->base);
	if (rc)
	goto done;
	}

	functl &= ~FUNNEL_HOLDTIME_MASK;
	functl \|= FUNNEL_HOLDTIME;
	functl \|= (1 << port);
	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
	writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
	done:
	CS_LOCK(drvdata->base);
	return rc;
	}

	static int funnel_enable(struct coresight_device *csdev, int inport,
	int outport)
	{
	int rc = 0;
	struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
	unsigned long flags;
	bool first_enable = false;

	spin_lock_irqsave(&drvdata->spinlock, flags);
	if (atomic_read(&csdev->refcnt[inport]) == 0) {
	if (drvdata->base)
	rc = dynamic_funnel_enable_hw(drvdata, inport);
	if (!rc)
	first_enable = true;
	}
	if (!rc)
	atomic_inc(&csdev->refcnt[inport]);
	spin_unlock_irqrestore(&drvdata->spinlock, flags);

	if (first_enable)
	dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n", inport);
	return rc;
	}

	static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
	int inport)
	{
	u32 functl;

	CS_UNLOCK(drvdata->base);

	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
	functl &= ~(1 << inport);
	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);

	/* Disclaim the device if none of the slaves are now active */
	if (!(functl & FUNNEL_ENSx_MASK))
	coresight_disclaim_device_unlocked(drvdata->base);

	CS_LOCK(drvdata->base);
	}

	static void funnel_disable(struct coresight_device *csdev, int inport,
	int outport)
	{
	struct funnel_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(&csdev->refcnt[inport]) == 0) {
	if (drvdata->base)
	dynamic_funnel_disable_hw(drvdata, inport);
	last_disable = true;
	}
	spin_unlock_irqrestore(&drvdata->spinlock, flags);

	if (last_disable)
	dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n", inport);
	}

	static const struct coresight_ops_link funnel_link_ops = {
	.enable = funnel_enable,
	.disable = funnel_disable,
	};

	static const struct coresight_ops funnel_cs_ops = {
	.link_ops = &funnel_link_ops,
	};

	static ssize_t priority_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
	unsigned long val = drvdata->priority;

	return sprintf(buf, "%#lx\n", val);
	}

	static ssize_t priority_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	int ret;
	unsigned long val;
	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);

	ret = kstrtoul(buf, 16, &val);
	if (ret)
	return ret;

	drvdata->priority = val;
	return size;
	}
	static DEVICE_ATTR_RW(priority);

	static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
	{
	u32 functl;

	CS_UNLOCK(drvdata->base);
	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
	CS_LOCK(drvdata->base);

	return functl;
	}

	static ssize_t funnel_ctrl_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	u32 val;
	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);

	pm_runtime_get_sync(dev->parent);

	val = get_funnel_ctrl_hw(drvdata);

	pm_runtime_put(dev->parent);

	return sprintf(buf, "%#x\n", val);
	}
	static DEVICE_ATTR_RO(funnel_ctrl);

	static struct attribute *coresight_funnel_attrs[] = {
	&dev_attr_funnel_ctrl.attr,
	&dev_attr_priority.attr,
	NULL,
	};
	ATTRIBUTE_GROUPS(coresight_funnel);

	static int funnel_probe(struct device dev, struct resource res)
	{
	int ret;
	void __iomem *base;
	struct coresight_platform_data *pdata = NULL;
	struct funnel_drvdata *drvdata;
	struct coresight_desc desc = { 0 };

	if (is_of_node(dev_fwnode(dev)) &&
	of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
	dev_warn_once(dev, "Uses OBSOLETE CoreSight funnel binding\n");

	desc.name = coresight_alloc_device_name(&funnel_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-funnel, 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 = coresight_funnel_groups;
	}

	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_MERG;
	desc.ops = &funnel_cs_ops;
	desc.pdata = pdata;
	desc.dev = dev;
	drvdata->csdev = coresight_register(&desc);
	if (IS_ERR(drvdata->csdev)) {
	ret = PTR_ERR(drvdata->csdev);
	goto out_disable_clk;
	}

	pm_runtime_put(dev);
	ret = 0;

	out_disable_clk:
	if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
	clk_disable_unprepare(drvdata->atclk);
	return ret;
	}

	#ifdef CONFIG_PM
	static int funnel_runtime_suspend(struct device *dev)
	{
	struct funnel_drvdata *drvdata = dev_get_drvdata(dev);

	if (drvdata && !IS_ERR(drvdata->atclk))
	clk_disable_unprepare(drvdata->atclk);

	return 0;
	}

	static int funnel_runtime_resume(struct device *dev)
	{
	struct funnel_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 funnel_dev_pm_ops = {
	SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
	};

	static int static_funnel_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 funnel do not have programming base */
	ret = funnel_probe(&pdev->dev, NULL);

	if (ret) {
	pm_runtime_put_noidle(&pdev->dev);
	pm_runtime_disable(&pdev->dev);
	}

	return ret;
	}

	static const struct of_device_id static_funnel_match[] = {
	{.compatible = "arm,coresight-static-funnel"},
	{}
	};

	#ifdef CONFIG_ACPI
	static const struct acpi_device_id static_funnel_ids[] = {
	{"ARMHC9FE", 0},
	{},
	};
	#endif

	static struct platform_driver static_funnel_driver = {
	.probe = static_funnel_probe,
	.driver = {
	.name = "coresight-static-funnel",
	.of_match_table = static_funnel_match,
	.acpi_match_table = ACPI_PTR(static_funnel_ids),
	.pm = &funnel_dev_pm_ops,
	.suppress_bind_attrs = true,
	},
	};
	builtin_platform_driver(static_funnel_driver);

	static int dynamic_funnel_probe(struct amba_device *adev,
	const struct amba_id *id)
	{
	return funnel_probe(&adev->dev, &adev->res);
	}

	static const struct amba_id dynamic_funnel_ids[] = {
	{
	.id = 0x000bb908,
	.mask = 0x000fffff,
	},
	{
	/* Coresight SoC-600 */
	.id = 0x000bb9eb,
	.mask = 0x000fffff,
	},
	{ 0, 0},
	};

	static struct amba_driver dynamic_funnel_driver = {
	.drv = {
	.name = "coresight-dynamic-funnel",
	.owner = THIS_MODULE,
	.pm = &funnel_dev_pm_ops,
	.suppress_bind_attrs = true,
	},
	.probe = dynamic_funnel_probe,
	.id_table = dynamic_funnel_ids,
	};
	builtin_amba_driver(dynamic_funnel_driver);