drivers/hwtracing/coresight/coresight-dynamic-replicator.c - kernel/common - Git at Google

 /*
  * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that 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/amba/bus.h>
 #include <linux/clk.h>
 #include <linux/coresight.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/of.h>
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>

 #include "coresight-priv.h"

 #define REPLICATOR_IDFILTER0		0x000
 #define REPLICATOR_IDFILTER1		0x004

 /**
  * struct replicator_state - specifics associated to a replicator component
  * @base:	memory mapped base address for this component.
  * @dev:	the device entity associated with this component
  * @atclk:	optional clock for the core parts of the replicator.
  * @csdev:	component vitals needed by the framework
  * @spinlock:	serialize enable/disable operations.
  */
 struct replicator_state {
 	void __iomem		*base;
 	struct device		*dev;
 	struct clk		*atclk;
 	struct coresight_device	*csdev;
 	spinlock_t		spinlock;
 };

 /*
  * replicator_reset : Reset the replicator configuration to sane values.
  */
 static void replicator_reset(struct replicator_state *drvdata)
 {
 	CS_UNLOCK(drvdata->base);

 	if (!coresight_claim_device_unlocked(drvdata->base)) {
 		writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
 		writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
 		coresight_disclaim_device_unlocked(drvdata->base);
 	}

 	CS_LOCK(drvdata->base);
 }

 static int dynamic_replicator_enable(struct replicator_state *drvdata,
 				     int inport, int outport)
 {
 	int rc = 0;
 	u32 reg;

 	switch (outport) {
 	case 0:
 		reg = REPLICATOR_IDFILTER0;
 		break;
 	case 1:
 		reg = REPLICATOR_IDFILTER1;
 		break;
 	default:
 		WARN_ON(1);
 		return -EINVAL;
 	}

 	CS_UNLOCK(drvdata->base);

 	if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
 	    (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
 		rc = coresight_claim_device_unlocked(drvdata->base);

 	/* Ensure that the outport is enabled. */
 	if (!rc)
 		writel_relaxed(0x00, drvdata->base + reg);
 	CS_LOCK(drvdata->base);

 	return rc;
 }

 static int replicator_enable(struct coresight_device *csdev, int inport,
 			     int outport)
 {
 	int rc = 0;
 	struct replicator_state *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[outport]) == 0) {
 		rc = dynamic_replicator_enable(drvdata, inport, outport);
 		if (!rc)
 			first_enable = true;
 	}
 	if (!rc)
 		atomic_inc(&csdev->refcnt[outport]);
 	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_state *drvdata,
 				       int inport, int outport)
 {
 	u32 reg;

 	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(drvdata->base);
 	CS_LOCK(drvdata->base);
 }

 static void replicator_disable(struct coresight_device *csdev, int inport,
 			       int outport)
 {
 	struct replicator_state *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[outport]) == 0) {
 		dynamic_replicator_disable(drvdata, inport, outport);
 		last_disable = true;
 	}
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);

 	if (last_disable)
 		dev_dbg(drvdata->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,
 };

 #define coresight_replicator_reg(name, offset) \
 	coresight_simple_reg32(struct replicator_state, name, offset)

 coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
 coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);

 static struct attribute *replicator_mgmt_attrs[] = {
 	&dev_attr_idfilter0.attr,
 	&dev_attr_idfilter1.attr,
 	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 amba_device *adev, const struct amba_id *id)
 {
 	int ret;
 	struct device *dev = &adev->dev;
 	struct resource *res = &adev->res;
 	struct coresight_platform_data *pdata = NULL;
 	struct replicator_state *drvdata;
 	struct coresight_desc desc = { 0 };
 	struct device_node *np = adev->dev.of_node;
 	void __iomem *base;

 	if (np) {
 		pdata = of_get_coresight_platform_data(dev, np);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 		adev->dev.platform_data = pdata;
 	}

 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;

 	drvdata->dev = &adev->dev;
 	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 	if (!IS_ERR(drvdata->atclk)) {
 		ret = clk_prepare_enable(drvdata->atclk);
 		if (ret)
 			return ret;
 	}

 	/* Validity for the resource is already checked by the AMBA core */
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);

 	drvdata->base = base;
 	dev_set_drvdata(dev, drvdata);
 	pm_runtime_put(&adev->dev);

 	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 = adev->dev.platform_data;
 	desc.dev = &adev->dev;
 	desc.groups = replicator_groups;
 	drvdata->csdev = coresight_register(&desc);

 	if (!IS_ERR(drvdata->csdev)) {
 		replicator_reset(drvdata);
 		return 0;
 	}
 	return PTR_ERR(drvdata->csdev);
 }

 #ifdef CONFIG_PM
 static int replicator_runtime_suspend(struct device *dev)
 {
 	struct replicator_state *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_state *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 amba_id replicator_ids[] = {
 	{
 		.id     = 0x0003b909,
 		.mask   = 0x0003ffff,
 	},
 	{
 		/* Coresight SoC-600 */
 		.id     = 0x000bb9ec,
 		.mask   = 0x000fffff,
 	},
 	{ 0, 0 },
 };

 static struct amba_driver replicator_driver = {
 	.drv = {
 		.name	= "coresight-dynamic-replicator",
 		.pm	= &replicator_dev_pm_ops,
 		.suppress_bind_attrs = true,
 	},
 	.probe		= replicator_probe,
 	.id_table	= replicator_ids,
 };
 builtin_amba_driver(replicator_driver);
	/*
	* Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that 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/amba/bus.h>
	#include <linux/clk.h>
	#include <linux/coresight.h>
	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/of.h>
	#include <linux/pm_runtime.h>
	#include <linux/slab.h>

	#include "coresight-priv.h"

	#define REPLICATOR_IDFILTER0 0x000
	#define REPLICATOR_IDFILTER1 0x004

	/**
	* struct replicator_state - specifics associated to a replicator component
	* @base: memory mapped base address for this component.
	* @dev: the device entity associated with this component
	* @atclk: optional clock for the core parts of the replicator.
	* @csdev: component vitals needed by the framework
	* @spinlock: serialize enable/disable operations.
	*/
	struct replicator_state {
	void __iomem *base;
	struct device *dev;
	struct clk *atclk;
	struct coresight_device *csdev;
	spinlock_t spinlock;
	};

	/*
	* replicator_reset : Reset the replicator configuration to sane values.
	*/
	static void replicator_reset(struct replicator_state *drvdata)
	{
	CS_UNLOCK(drvdata->base);

	if (!coresight_claim_device_unlocked(drvdata->base)) {
	writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
	writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
	coresight_disclaim_device_unlocked(drvdata->base);
	}

	CS_LOCK(drvdata->base);
	}

	static int dynamic_replicator_enable(struct replicator_state *drvdata,
	int inport, int outport)
	{
	int rc = 0;
	u32 reg;

	switch (outport) {
	case 0:
	reg = REPLICATOR_IDFILTER0;
	break;
	case 1:
	reg = REPLICATOR_IDFILTER1;
	break;
	default:
	WARN_ON(1);
	return -EINVAL;
	}

	CS_UNLOCK(drvdata->base);

	if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
	(readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
	rc = coresight_claim_device_unlocked(drvdata->base);

	/* Ensure that the outport is enabled. */
	if (!rc)
	writel_relaxed(0x00, drvdata->base + reg);
	CS_LOCK(drvdata->base);

	return rc;
	}

	static int replicator_enable(struct coresight_device *csdev, int inport,
	int outport)
	{
	int rc = 0;
	struct replicator_state *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[outport]) == 0) {
	rc = dynamic_replicator_enable(drvdata, inport, outport);
	if (!rc)
	first_enable = true;
	}
	if (!rc)
	atomic_inc(&csdev->refcnt[outport]);
	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_state *drvdata,
	int inport, int outport)
	{
	u32 reg;

	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(drvdata->base);
	CS_LOCK(drvdata->base);
	}

	static void replicator_disable(struct coresight_device *csdev, int inport,
	int outport)
	{
	struct replicator_state *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[outport]) == 0) {
	dynamic_replicator_disable(drvdata, inport, outport);
	last_disable = true;
	}
	spin_unlock_irqrestore(&drvdata->spinlock, flags);

	if (last_disable)
	dev_dbg(drvdata->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,
	};

	#define coresight_replicator_reg(name, offset) \
	coresight_simple_reg32(struct replicator_state, name, offset)

	coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
	coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);

	static struct attribute *replicator_mgmt_attrs[] = {
	&dev_attr_idfilter0.attr,
	&dev_attr_idfilter1.attr,
	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 amba_device adev, const struct amba_id id)
	{
	int ret;
	struct device *dev = &adev->dev;
	struct resource *res = &adev->res;
	struct coresight_platform_data *pdata = NULL;
	struct replicator_state *drvdata;
	struct coresight_desc desc = { 0 };
	struct device_node *np = adev->dev.of_node;
	void __iomem *base;

	if (np) {
	pdata = of_get_coresight_platform_data(dev, np);
	if (IS_ERR(pdata))
	return PTR_ERR(pdata);
	adev->dev.platform_data = pdata;
	}

	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata)
	return -ENOMEM;

	drvdata->dev = &adev->dev;
	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
	if (!IS_ERR(drvdata->atclk)) {
	ret = clk_prepare_enable(drvdata->atclk);
	if (ret)
	return ret;
	}

	/* Validity for the resource is already checked by the AMBA core */
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
	return PTR_ERR(base);

	drvdata->base = base;
	dev_set_drvdata(dev, drvdata);
	pm_runtime_put(&adev->dev);

	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 = adev->dev.platform_data;
	desc.dev = &adev->dev;
	desc.groups = replicator_groups;
	drvdata->csdev = coresight_register(&desc);

	if (!IS_ERR(drvdata->csdev)) {
	replicator_reset(drvdata);
	return 0;
	}
	return PTR_ERR(drvdata->csdev);
	}

	#ifdef CONFIG_PM
	static int replicator_runtime_suspend(struct device *dev)
	{
	struct replicator_state *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_state *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 amba_id replicator_ids[] = {
	{
	.id = 0x0003b909,
	.mask = 0x0003ffff,
	},
	{
	/* Coresight SoC-600 */
	.id = 0x000bb9ec,
	.mask = 0x000fffff,
	},
	{ 0, 0 },
	};

	static struct amba_driver replicator_driver = {
	.drv = {
	.name = "coresight-dynamic-replicator",
	.pm = &replicator_dev_pm_ops,
	.suppress_bind_attrs = true,
	},
	.probe = replicator_probe,
	.id_table = replicator_ids,
	};
	builtin_amba_driver(replicator_driver);