drivers/coresight/coresight-funnel.c - kernel/msm - Git at Google

 /* Copyright (c) 2011-2014, 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/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/of_coresight.h>
 #include <linux/coresight.h>
 #include <linux/spinlock.h>
 #include <linux/notifier.h>
 #include <soc/qcom/jtag.h>

 #include "coresight-priv.h"

 #define funnel_writel(drvdata, val, off)	\
 			__raw_writel((val), drvdata->base + off)
 #define funnel_readl(drvdata, off)		\
 			__raw_readl(drvdata->base + off)

 #define FUNNEL_LOCK(drvdata)						\
 do {									\
 	mb();								\
 	funnel_writel(drvdata, 0x0, CORESIGHT_LAR);			\
 } while (0)
 #define FUNNEL_UNLOCK(drvdata)						\
 do {									\
 	funnel_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR);	\
 	mb();								\
 } while (0)

 #define FUNNEL_FUNCTL		(0x000)
 #define FUNNEL_PRICTL		(0x004)
 #define FUNNEL_ITATBDATA0	(0xEEC)
 #define FUNNEL_ITATBCTR2	(0xEF0)
 #define FUNNEL_ITATBCTR1	(0xEF4)
 #define FUNNEL_ITATBCTR0	(0xEF8)

 #define FUNNEL_HOLDTIME_MASK	(0xF00)
 #define FUNNEL_HOLDTIME_SHFT	(0x8)
 #define FUNNEL_HOLDTIME		(0x7 << FUNNEL_HOLDTIME_SHFT)
 #define FUNNEL_NR_PORTS		8

 struct funnel_drvdata {
 	void __iomem		*base;
 	struct device		*dev;
 	struct coresight_device	*csdev;
 	struct clk		*clk;
 	uint32_t		priority;
 	spinlock_t		spinlock;
 	DECLARE_BITMAP(inport, FUNNEL_NR_PORTS);
 	bool			notify;
 	struct notifier_block	jtag_save_blk;
 	struct notifier_block	jtag_restore_blk;
 };

 static void __funnel_enable(struct funnel_drvdata *drvdata, int port)
 {
 	uint32_t functl;

 	FUNNEL_UNLOCK(drvdata);

 	functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
 	functl &= ~FUNNEL_HOLDTIME_MASK;
 	functl |= FUNNEL_HOLDTIME;
 	functl |= (1 << port);
 	funnel_writel(drvdata, functl, FUNNEL_FUNCTL);
 	funnel_writel(drvdata, drvdata->priority, FUNNEL_PRICTL);

 	FUNNEL_LOCK(drvdata);
 }

 static int funnel_enable(struct coresight_device *csdev, int inport,
 			 int outport)
 {
 	struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 	int ret;

 	ret = clk_prepare_enable(drvdata->clk);
 	if (ret)
 		return ret;

 	spin_lock(&drvdata->spinlock);
 	__funnel_enable(drvdata, inport);
 	__set_bit(inport, drvdata->inport);
 	spin_unlock(&drvdata->spinlock);

 	dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
 	return 0;
 }

 static int funnel_enable_cpu_port(struct notifier_block *this,
 				  unsigned long event, void *ptr)
 {
 	struct funnel_drvdata *drvdata = container_of(this,
 						      struct funnel_drvdata,
 						      jtag_restore_blk);
 	int port;
 	int cpu = raw_smp_processor_id();

 	port = coresight_etm_get_funnel_port(cpu);
 	if (port < 0) {
 		pr_warn_ratelimited("error retrieving ETM funnel port: %#x\n",
 				     port);
 		return notifier_from_errno(port);
 	}
 	spin_lock(&drvdata->spinlock);
 	if (!test_bit(port, drvdata->inport))
 		goto out;
 	__funnel_enable(drvdata, port);
 out:
 	spin_unlock(&drvdata->spinlock);
 	return NOTIFY_OK;
 }

 static void __funnel_disable(struct funnel_drvdata *drvdata, int inport)
 {
 	uint32_t functl;

 	FUNNEL_UNLOCK(drvdata);

 	functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
 	functl &= ~(1 << inport);
 	funnel_writel(drvdata, functl, FUNNEL_FUNCTL);

 	FUNNEL_LOCK(drvdata);
 }

 static void funnel_disable(struct coresight_device *csdev, int inport,
 			   int outport)
 {
 	struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

 	spin_lock(&drvdata->spinlock);
 	__funnel_disable(drvdata, inport);
 	__clear_bit(inport, drvdata->inport);
 	spin_unlock(&drvdata->spinlock);

 	clk_disable_unprepare(drvdata->clk);

 	dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
 }

 static int funnel_disable_cpu_port(struct notifier_block *this,
 				   unsigned long event, void *ptr)
 {
 	struct funnel_drvdata *drvdata = container_of(this,
 						      struct funnel_drvdata,
 						      jtag_save_blk);
 	int port;
 	int cpu = raw_smp_processor_id();

 	port = coresight_etm_get_funnel_port(cpu);
 	if (port < 0) {
 		pr_warn_ratelimited("error retrieving ETM funnel port: %#x\n",
 				     port);
 		return notifier_from_errno(port);
 	}
 	spin_lock(&drvdata->spinlock);
 	if (!test_bit(port, drvdata->inport))
 		goto out;
 	__funnel_disable(drvdata, port);
 out:
 	spin_unlock(&drvdata->spinlock);
 	return NOTIFY_OK;
 }

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

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

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

 	if (sscanf(buf, "%lx", &val) != 1)
 		return -EINVAL;

 	drvdata->priority = val;
 	return size;
 }
 static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, funnel_show_priority,
 		   funnel_store_priority);

 static struct attribute *funnel_attrs[] = {
 	&dev_attr_priority.attr,
 	NULL,
 };

 static struct attribute_group funnel_attr_grp = {
 	.attrs = funnel_attrs,
 };

 static const struct attribute_group *funnel_attr_grps[] = {
 	&funnel_attr_grp,
 	NULL,
 };

 static int funnel_probe(struct platform_device *pdev)
 {
 	int ret;
 	struct device *dev = &pdev->dev;
 	struct coresight_platform_data *pdata;
 	struct funnel_drvdata *drvdata;
 	struct resource *res;
 	struct coresight_desc *desc;

 	if (coresight_fuse_access_disabled())
 		return -EPERM;

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

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

 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "funnel-base");
 	if (!res)
 		return -ENODEV;

 	drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
 	if (!drvdata->base)
 		return -ENOMEM;

 	drvdata->clk = devm_clk_get(dev, "core_clk");
 	if (IS_ERR(drvdata->clk))
 		return PTR_ERR(drvdata->clk);

 	ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
 	if (ret)
 		return ret;

 	spin_lock_init(&drvdata->spinlock);

 	if (pdev->dev.of_node)
 		drvdata->notify = of_property_read_bool(pdev->dev.of_node,
 						"qcom,funnel-save-restore");

 	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 	if (!desc)
 		return -ENOMEM;
 	desc->type = CORESIGHT_DEV_TYPE_LINK;
 	desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
 	desc->ops = &funnel_cs_ops;
 	desc->pdata = pdev->dev.platform_data;
 	desc->dev = &pdev->dev;
 	desc->groups = funnel_attr_grps;
 	desc->owner = THIS_MODULE;
 	drvdata->csdev = coresight_register(desc);
 	if (IS_ERR(drvdata->csdev))
 		return PTR_ERR(drvdata->csdev);

 	if (drvdata->notify) {
 		drvdata->jtag_save_blk.notifier_call = funnel_disable_cpu_port;
 		ret = msm_jtag_save_register(&drvdata->jtag_save_blk);
 		if (ret) {
 			dev_err(dev,
 				"Jtag save notifier register failed:%d\n",
 				ret);
 			drvdata->notify = false;
 			goto out;
 		}

 		drvdata->jtag_restore_blk.notifier_call =
 							funnel_enable_cpu_port;
 		ret = msm_jtag_restore_register(&drvdata->jtag_restore_blk);
 		if (ret) {
 			dev_err(dev,
 				"Jtag restore notifier register failed:%d\n",
 				ret);
 			msm_jtag_save_unregister(&drvdata->jtag_save_blk);
 			drvdata->notify = false;
 		}
 	}
 out:
 	dev_info(dev, "FUNNEL initialized\n");
 	return 0;
 }

 static int funnel_remove(struct platform_device *pdev)
 {
 	struct funnel_drvdata *drvdata = platform_get_drvdata(pdev);

 	if (drvdata->notify) {
 		msm_jtag_restore_unregister(&drvdata->jtag_restore_blk);
 		msm_jtag_save_unregister(&drvdata->jtag_save_blk);
 	}
 	coresight_unregister(drvdata->csdev);
 	return 0;
 }

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

 static struct platform_driver funnel_driver = {
 	.probe          = funnel_probe,
 	.remove         = funnel_remove,
 	.driver         = {
 		.name   = "coresight-funnel",
 		.owner	= THIS_MODULE,
 		.of_match_table = funnel_match,
 	},
 };

 static int __init funnel_init(void)
 {
 	return platform_driver_register(&funnel_driver);
 }
 module_init(funnel_init);

 static void __exit funnel_exit(void)
 {
 	platform_driver_unregister(&funnel_driver);
 }
 module_exit(funnel_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("CoreSight Funnel driver");
	/* Copyright (c) 2011-2014, 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/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/device.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>
	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/clk.h>
	#include <linux/of.h>
	#include <linux/of_coresight.h>
	#include <linux/coresight.h>
	#include <linux/spinlock.h>
	#include <linux/notifier.h>
	#include <soc/qcom/jtag.h>

	#include "coresight-priv.h"

	#define funnel_writel(drvdata, val, off) \
	__raw_writel((val), drvdata->base + off)
	#define funnel_readl(drvdata, off) \
	__raw_readl(drvdata->base + off)

	#define FUNNEL_LOCK(drvdata) \
	do { \
	mb(); \
	funnel_writel(drvdata, 0x0, CORESIGHT_LAR); \
	} while (0)
	#define FUNNEL_UNLOCK(drvdata) \
	do { \
	funnel_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \
	mb(); \
	} while (0)

	#define FUNNEL_FUNCTL (0x000)
	#define FUNNEL_PRICTL (0x004)
	#define FUNNEL_ITATBDATA0 (0xEEC)
	#define FUNNEL_ITATBCTR2 (0xEF0)
	#define FUNNEL_ITATBCTR1 (0xEF4)
	#define FUNNEL_ITATBCTR0 (0xEF8)

	#define FUNNEL_HOLDTIME_MASK (0xF00)
	#define FUNNEL_HOLDTIME_SHFT (0x8)
	#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
	#define FUNNEL_NR_PORTS 8

	struct funnel_drvdata {
	void __iomem *base;
	struct device *dev;
	struct coresight_device *csdev;
	struct clk *clk;
	uint32_t priority;
	spinlock_t spinlock;
	DECLARE_BITMAP(inport, FUNNEL_NR_PORTS);
	bool notify;
	struct notifier_block jtag_save_blk;
	struct notifier_block jtag_restore_blk;
	};

	static void __funnel_enable(struct funnel_drvdata *drvdata, int port)
	{
	uint32_t functl;

	FUNNEL_UNLOCK(drvdata);

	functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
	functl &= ~FUNNEL_HOLDTIME_MASK;
	functl \|= FUNNEL_HOLDTIME;
	functl \|= (1 << port);
	funnel_writel(drvdata, functl, FUNNEL_FUNCTL);
	funnel_writel(drvdata, drvdata->priority, FUNNEL_PRICTL);

	FUNNEL_LOCK(drvdata);
	}

	static int funnel_enable(struct coresight_device *csdev, int inport,
	int outport)
	{
	struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
	int ret;

	ret = clk_prepare_enable(drvdata->clk);
	if (ret)
	return ret;

	spin_lock(&drvdata->spinlock);
	__funnel_enable(drvdata, inport);
	__set_bit(inport, drvdata->inport);
	spin_unlock(&drvdata->spinlock);

	dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
	return 0;
	}

	static int funnel_enable_cpu_port(struct notifier_block *this,
	unsigned long event, void *ptr)
	{
	struct funnel_drvdata *drvdata = container_of(this,
	struct funnel_drvdata,
	jtag_restore_blk);
	int port;
	int cpu = raw_smp_processor_id();

	port = coresight_etm_get_funnel_port(cpu);
	if (port < 0) {
	pr_warn_ratelimited("error retrieving ETM funnel port: %#x\n",
	port);
	return notifier_from_errno(port);
	}
	spin_lock(&drvdata->spinlock);
	if (!test_bit(port, drvdata->inport))
	goto out;
	__funnel_enable(drvdata, port);
	out:
	spin_unlock(&drvdata->spinlock);
	return NOTIFY_OK;
	}

	static void __funnel_disable(struct funnel_drvdata *drvdata, int inport)
	{
	uint32_t functl;

	FUNNEL_UNLOCK(drvdata);

	functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
	functl &= ~(1 << inport);
	funnel_writel(drvdata, functl, FUNNEL_FUNCTL);

	FUNNEL_LOCK(drvdata);
	}

	static void funnel_disable(struct coresight_device *csdev, int inport,
	int outport)
	{
	struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

	spin_lock(&drvdata->spinlock);
	__funnel_disable(drvdata, inport);
	__clear_bit(inport, drvdata->inport);
	spin_unlock(&drvdata->spinlock);

	clk_disable_unprepare(drvdata->clk);

	dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
	}

	static int funnel_disable_cpu_port(struct notifier_block *this,
	unsigned long event, void *ptr)
	{
	struct funnel_drvdata *drvdata = container_of(this,
	struct funnel_drvdata,
	jtag_save_blk);
	int port;
	int cpu = raw_smp_processor_id();

	port = coresight_etm_get_funnel_port(cpu);
	if (port < 0) {
	pr_warn_ratelimited("error retrieving ETM funnel port: %#x\n",
	port);
	return notifier_from_errno(port);
	}
	spin_lock(&drvdata->spinlock);
	if (!test_bit(port, drvdata->inport))
	goto out;
	__funnel_disable(drvdata, port);
	out:
	spin_unlock(&drvdata->spinlock);
	return NOTIFY_OK;
	}

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

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

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

	if (sscanf(buf, "%lx", &val) != 1)
	return -EINVAL;

	drvdata->priority = val;
	return size;
	}
	static DEVICE_ATTR(priority, S_IRUGO \| S_IWUSR, funnel_show_priority,
	funnel_store_priority);

	static struct attribute *funnel_attrs[] = {
	&dev_attr_priority.attr,
	NULL,
	};

	static struct attribute_group funnel_attr_grp = {
	.attrs = funnel_attrs,
	};

	static const struct attribute_group *funnel_attr_grps[] = {
	&funnel_attr_grp,
	NULL,
	};

	static int funnel_probe(struct platform_device *pdev)
	{
	int ret;
	struct device *dev = &pdev->dev;
	struct coresight_platform_data *pdata;
	struct funnel_drvdata *drvdata;
	struct resource *res;
	struct coresight_desc *desc;

	if (coresight_fuse_access_disabled())
	return -EPERM;

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

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

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "funnel-base");
	if (!res)
	return -ENODEV;

	drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
	if (!drvdata->base)
	return -ENOMEM;

	drvdata->clk = devm_clk_get(dev, "core_clk");
	if (IS_ERR(drvdata->clk))
	return PTR_ERR(drvdata->clk);

	ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
	if (ret)
	return ret;

	spin_lock_init(&drvdata->spinlock);

	if (pdev->dev.of_node)
	drvdata->notify = of_property_read_bool(pdev->dev.of_node,
	"qcom,funnel-save-restore");

	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
	if (!desc)
	return -ENOMEM;
	desc->type = CORESIGHT_DEV_TYPE_LINK;
	desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
	desc->ops = &funnel_cs_ops;
	desc->pdata = pdev->dev.platform_data;
	desc->dev = &pdev->dev;
	desc->groups = funnel_attr_grps;
	desc->owner = THIS_MODULE;
	drvdata->csdev = coresight_register(desc);
	if (IS_ERR(drvdata->csdev))
	return PTR_ERR(drvdata->csdev);

	if (drvdata->notify) {
	drvdata->jtag_save_blk.notifier_call = funnel_disable_cpu_port;
	ret = msm_jtag_save_register(&drvdata->jtag_save_blk);
	if (ret) {
	dev_err(dev,
	"Jtag save notifier register failed:%d\n",
	ret);
	drvdata->notify = false;
	goto out;
	}

	drvdata->jtag_restore_blk.notifier_call =
	funnel_enable_cpu_port;
	ret = msm_jtag_restore_register(&drvdata->jtag_restore_blk);
	if (ret) {
	dev_err(dev,
	"Jtag restore notifier register failed:%d\n",
	ret);
	msm_jtag_save_unregister(&drvdata->jtag_save_blk);
	drvdata->notify = false;
	}
	}
	out:
	dev_info(dev, "FUNNEL initialized\n");
	return 0;
	}

	static int funnel_remove(struct platform_device *pdev)
	{
	struct funnel_drvdata *drvdata = platform_get_drvdata(pdev);

	if (drvdata->notify) {
	msm_jtag_restore_unregister(&drvdata->jtag_restore_blk);
	msm_jtag_save_unregister(&drvdata->jtag_save_blk);
	}
	coresight_unregister(drvdata->csdev);
	return 0;
	}

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

	static struct platform_driver funnel_driver = {
	.probe = funnel_probe,
	.remove = funnel_remove,
	.driver = {
	.name = "coresight-funnel",
	.owner = THIS_MODULE,
	.of_match_table = funnel_match,
	},
	};

	static int __init funnel_init(void)
	{
	return platform_driver_register(&funnel_driver);
	}
	module_init(funnel_init);

	static void __exit funnel_exit(void)
	{
	platform_driver_unregister(&funnel_driver);
	}
	module_exit(funnel_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("CoreSight Funnel driver");