coresight-funnel: add CoreSight Funnel driver

obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o

obj-$(CONFIG_CORESIGHT_SINK_TPIU) += coresight-tpiu.o

obj-$(CONFIG_CORESIGHT_SINK_ETBV10) += coresight-etb10.o

obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o

/* Copyright (c) 2011-2012, 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/err.h>

#include <linux/fs.h>

#include <linux/slab.h>

#include <linux/clk.h>

#include <linux/coresight.h>

#include <linux/amba/bus.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)

/**

 * struct funnel_drvdata - specifics associated to a funnel component

 * @base:	memory mapped base address for this component.

 * @dev:	the device entity associated to this component.

 * @csdev:	component vitals needed by the framework.

 * @clk:	the clock this component is associated to.

 * @priority:	port selection order.

 */

struct funnel_drvdata {

	void __iomem		*base;

	struct device		*dev;

	struct coresight_device	*csdev;

	struct clk		*clk;

	unsigned long		priority;

};

static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port)

{

	u32 functl;

	CS_UNLOCK(drvdata->base);

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

	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);

	CS_LOCK(drvdata->base);

}

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;

	funnel_enable_hw(drvdata, inport);

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

	return 0;

}

static void 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);

	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);

	funnel_disable_hw(drvdata, inport);

	clk_disable_unprepare(drvdata->clk);

	dev_info(drvdata->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)

{

	int ret;

	u32 val;

	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);

	ret = clk_prepare_enable(drvdata->clk);

	if (ret)

		return ret;

	val = get_funnel_ctrl_hw(drvdata);

	clk_disable_unprepare(drvdata->clk);

	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 amba_device *adev, const struct amba_id *id)

{

	void __iomem *base;

	struct device *dev = &adev->dev;

	struct coresight_platform_data *pdata = NULL;

	struct funnel_drvdata *drvdata;

	struct resource *res = &adev->res;

	struct coresight_desc *desc;

	struct device_node *np = adev->dev.of_node;

	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;

	dev_set_drvdata(dev, drvdata);

	/* 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;

	drvdata->clk = adev->pclk;

	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 = pdata;

	desc->dev = dev;

	desc->groups = coresight_funnel_groups;

	drvdata->csdev = coresight_register(desc);

	if (IS_ERR(drvdata->csdev))

		return PTR_ERR(drvdata->csdev);

	dev_info(dev, "FUNNEL initialized\n");

	return 0;

}

static int funnel_remove(struct amba_device *adev)

{

	struct funnel_drvdata *drvdata = amba_get_drvdata(adev);

	coresight_unregister(drvdata->csdev);

	return 0;

}

static struct amba_id funnel_ids[] = {

	{

		.id     = 0x0003b908,

		.mask   = 0x0003ffff,

	},

	{ 0, 0},

};

static struct amba_driver funnel_driver = {

	.drv = {

		.name	= "coresight-funnel",

		.owner	= THIS_MODULE,

	},

	.probe		= funnel_probe,

	.remove		= funnel_remove,

	.id_table	= funnel_ids,

};

static int __init funnel_init(void)

{

	return amba_driver_register(&funnel_driver);

}

module_init(funnel_init);

static void __exit funnel_exit(void)

{

	amba_driver_unregister(&funnel_driver);

}

module_exit(funnel_exit);

MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("CoreSight Funnel driver");