[deliverable/linux.git] / drivers / hwtracing / coresight / coresight-funnel.c

/* 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/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)

/**
 * 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.
 * @atclk:	optional clock for the core parts of the funnel.
 * @csdev:	component vitals needed by the framework.
 * @priority:	port selection order.
 */
struct funnel_drvdata {
	void __iomem		*base;
	struct device		*dev;
	struct clk		*atclk;
	struct coresight_device	*csdev;
	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);

	pm_runtime_get_sync(drvdata->dev);
	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);
	pm_runtime_put(drvdata->dev);

	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)
{
	u32 val;
	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);

	pm_runtime_get_sync(drvdata->dev);

	val = get_funnel_ctrl_hw(drvdata);

	pm_runtime_put(drvdata->dev);

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

	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;
}

#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 struct amba_id funnel_ids[] = {
	{
		.id     = 0x0003b908,
		.mask   = 0x0003ffff,
	},
	{ 0, 0},
};

static struct amba_driver funnel_driver = {
	.drv = {
		.name	= "coresight-funnel",
		.owner	= THIS_MODULE,
		.pm	= &funnel_dev_pm_ops,
	},
	.probe		= funnel_probe,
	.remove		= funnel_remove,
	.id_table	= funnel_ids,
};

module_amba_driver(funnel_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Funnel driver");
Commit	Line	Data
6e21e345 PP	1	/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License version 2 and
	5	* only version 2 as published by the Free Software Foundation.
	6	*
	7	* This program is distributed in the hope that it will be useful,
	8	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	* GNU General Public License for more details.
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
	15	#include <linux/init.h>
	16	#include <linux/types.h>
	17	#include <linux/device.h>
	18	#include <linux/err.h>
	19	#include <linux/fs.h>
	20	#include <linux/slab.h>
e2d08f96	21	#include <linux/pm_runtime.h>
6e21e345 PP	22	#include <linux/coresight.h>
6e21e345 PP	23	#include <linux/amba/bus.h>
2e5f75d1	24	#include <linux/clk.h>
6e21e345 PP	25
	26	#include "coresight-priv.h"
	27
	28	#define FUNNEL_FUNCTL 0x000
	29	#define FUNNEL_PRICTL 0x004
	30
	31	#define FUNNEL_HOLDTIME_MASK 0xf00
	32	#define FUNNEL_HOLDTIME_SHFT 0x8
	33	#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
	34
	35	/**
	36	* struct funnel_drvdata - specifics associated to a funnel component
	37	* @base: memory mapped base address for this component.
	38	* @dev: the device entity associated to this component.
2e5f75d1	39	* @atclk: optional clock for the core parts of the funnel.
6e21e345	40	* @csdev: component vitals needed by the framework.
6e21e345 PP	41	* @priority: port selection order.
	42	*/
	43	struct funnel_drvdata {
	44	void __iomem *base;
	45	struct device *dev;
2e5f75d1	46	struct clk *atclk;
6e21e345	47	struct coresight_device *csdev;
6e21e345 PP	48	unsigned long priority;
	49	};
	50
	51	static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
	52	{
	53	u32 functl;
	54
	55	CS_UNLOCK(drvdata->base);
	56
	57	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
	58	functl &= ~FUNNEL_HOLDTIME_MASK;
	59	functl \|= FUNNEL_HOLDTIME;
	60	functl \|= (1 << port);
	61	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
	62	writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
	63
	64	CS_LOCK(drvdata->base);
	65	}
	66
	67	static int funnel_enable(struct coresight_device *csdev, int inport,
	68	int outport)
	69	{
	70	struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
6e21e345	71
e2d08f96	72	pm_runtime_get_sync(drvdata->dev);
6e21e345 PP	73	funnel_enable_hw(drvdata, inport);
	74
	75	dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
	76	return 0;
	77	}
	78
	79	static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport)
	80	{
	81	u32 functl;
	82
	83	CS_UNLOCK(drvdata->base);
	84
	85	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
	86	functl &= ~(1 << inport);
	87	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
	88
	89	CS_LOCK(drvdata->base);
	90	}
	91
	92	static void funnel_disable(struct coresight_device *csdev, int inport,
	93	int outport)
	94	{
	95	struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
	96
	97	funnel_disable_hw(drvdata, inport);
e2d08f96	98	pm_runtime_put(drvdata->dev);
6e21e345 PP	99
	100	dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
	101	}
	102
	103	static const struct coresight_ops_link funnel_link_ops = {
	104	.enable = funnel_enable,
	105	.disable = funnel_disable,
	106	};
	107
	108	static const struct coresight_ops funnel_cs_ops = {
	109	.link_ops = &funnel_link_ops,
	110	};
	111
	112	static ssize_t priority_show(struct device *dev,
	113	struct device_attribute attr, char buf)
	114	{
	115	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
	116	unsigned long val = drvdata->priority;
	117
	118	return sprintf(buf, "%#lx\n", val);
	119	}
	120
	121	static ssize_t priority_store(struct device *dev,
	122	struct device_attribute *attr,
	123	const char *buf, size_t size)
	124	{
	125	int ret;
	126	unsigned long val;
	127	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
	128
	129	ret = kstrtoul(buf, 16, &val);
	130	if (ret)
	131	return ret;
	132
	133	drvdata->priority = val;
	134	return size;
	135	}
	136	static DEVICE_ATTR_RW(priority);
	137
	138	static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
	139	{
	140	u32 functl;
	141
	142	CS_UNLOCK(drvdata->base);
	143	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
	144	CS_LOCK(drvdata->base);
	145
	146	return functl;
	147	}
	148
	149	static ssize_t funnel_ctrl_show(struct device *dev,
	150	struct device_attribute attr, char buf)
	151	{
6e21e345 PP	152	u32 val;
	153	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
	154
e2d08f96	155	pm_runtime_get_sync(drvdata->dev);
6e21e345 PP	156
6e21e345 PP	157	val = get_funnel_ctrl_hw(drvdata);
e2d08f96 LW	158
e2d08f96 LW	159	pm_runtime_put(drvdata->dev);
6e21e345 PP	160
	161	return sprintf(buf, "%#x\n", val);
	162	}
	163	static DEVICE_ATTR_RO(funnel_ctrl);
	164
	165	static struct attribute *coresight_funnel_attrs[] = {
	166	&dev_attr_funnel_ctrl.attr,
	167	&dev_attr_priority.attr,
	168	NULL,
	169	};
	170	ATTRIBUTE_GROUPS(coresight_funnel);
	171
	172	static int funnel_probe(struct amba_device adev, const struct amba_id id)
	173	{
2e5f75d1	174	int ret;
6e21e345 PP	175	void __iomem *base;
	176	struct device *dev = &adev->dev;
	177	struct coresight_platform_data *pdata = NULL;
	178	struct funnel_drvdata *drvdata;
	179	struct resource *res = &adev->res;
	180	struct coresight_desc *desc;
	181	struct device_node *np = adev->dev.of_node;
	182
	183	if (np) {
	184	pdata = of_get_coresight_platform_data(dev, np);
	185	if (IS_ERR(pdata))
	186	return PTR_ERR(pdata);
	187	adev->dev.platform_data = pdata;
	188	}
	189
	190	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	191	if (!drvdata)
	192	return -ENOMEM;
	193
	194	drvdata->dev = &adev->dev;
2e5f75d1 LW	195	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
	196	if (!IS_ERR(drvdata->atclk)) {
	197	ret = clk_prepare_enable(drvdata->atclk);
	198	if (ret)
	199	return ret;
	200	}
6e21e345 PP	201	dev_set_drvdata(dev, drvdata);
	202
	203	/* Validity for the resource is already checked by the AMBA core */
	204	base = devm_ioremap_resource(dev, res);
	205	if (IS_ERR(base))
	206	return PTR_ERR(base);
	207
	208	drvdata->base = base;
e2d08f96	209	pm_runtime_put(&adev->dev);
6e21e345 PP	210
	211	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
	212	if (!desc)
	213	return -ENOMEM;
	214
	215	desc->type = CORESIGHT_DEV_TYPE_LINK;
	216	desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
	217	desc->ops = &funnel_cs_ops;
	218	desc->pdata = pdata;
	219	desc->dev = dev;
	220	desc->groups = coresight_funnel_groups;
	221	drvdata->csdev = coresight_register(desc);
	222	if (IS_ERR(drvdata->csdev))
	223	return PTR_ERR(drvdata->csdev);
	224
	225	dev_info(dev, "FUNNEL initialized\n");
	226	return 0;
	227	}
	228
	229	static int funnel_remove(struct amba_device *adev)
	230	{
	231	struct funnel_drvdata *drvdata = amba_get_drvdata(adev);
	232
	233	coresight_unregister(drvdata->csdev);
	234	return 0;
	235	}
	236
2e5f75d1 LW	237	#ifdef CONFIG_PM
	238	static int funnel_runtime_suspend(struct device *dev)
	239	{
	240	struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
	241
	242	if (drvdata && !IS_ERR(drvdata->atclk))
	243	clk_disable_unprepare(drvdata->atclk);
	244
	245	return 0;
	246	}
	247
	248	static int funnel_runtime_resume(struct device *dev)
	249	{
	250	struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
	251
	252	if (drvdata && !IS_ERR(drvdata->atclk))
	253	clk_prepare_enable(drvdata->atclk);
	254
	255	return 0;
	256	}
	257	#endif
	258
	259	static const struct dev_pm_ops funnel_dev_pm_ops = {
	260	SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
	261	};
	262
6e21e345 PP	263	static struct amba_id funnel_ids[] = {
	264	{
	265	.id = 0x0003b908,
	266	.mask = 0x0003ffff,
	267	},
	268	{ 0, 0},
	269	};
	270
	271	static struct amba_driver funnel_driver = {
	272	.drv = {
	273	.name = "coresight-funnel",
	274	.owner = THIS_MODULE,
2e5f75d1	275	.pm = &funnel_dev_pm_ops,
6e21e345 PP	276	},
	277	.probe = funnel_probe,
	278	.remove = funnel_remove,
	279	.id_table = funnel_ids,
	280	};
	281
a48f52e1	282	module_amba_driver(funnel_driver);
6e21e345 PP	283
	284	MODULE_LICENSE("GPL v2");
	285	MODULE_DESCRIPTION("CoreSight Funnel driver");