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

/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
 *
 * Description: CoreSight Funnel driver
 *
 * 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/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);

	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);

	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 = { 0 };
	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.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);

	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,
		.suppress_bind_attrs = true,
	},
	.probe		= funnel_probe,
	.id_table	= funnel_ids,
};
builtin_amba_driver(funnel_driver);
Commit	Line	Data
6e21e345	1	/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
941943cf PG	2	*
941943cf PG	3	* Description: CoreSight Funnel driver
6e21e345 PP	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 and
	7	* only version 2 as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*/
	14
	15	#include <linux/kernel.h>
6e21e345 PP	16	#include <linux/init.h>
	17	#include <linux/types.h>
	18	#include <linux/device.h>
	19	#include <linux/err.h>
	20	#include <linux/fs.h>
	21	#include <linux/slab.h>
e2d08f96	22	#include <linux/pm_runtime.h>
6e21e345 PP	23	#include <linux/coresight.h>
6e21e345 PP	24	#include <linux/amba/bus.h>
2e5f75d1	25	#include <linux/clk.h>
6e21e345 PP	26
	27	#include "coresight-priv.h"
	28
	29	#define FUNNEL_FUNCTL 0x000
	30	#define FUNNEL_PRICTL 0x004
	31
	32	#define FUNNEL_HOLDTIME_MASK 0xf00
	33	#define FUNNEL_HOLDTIME_SHFT 0x8
	34	#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
	35
	36	/**
	37	* struct funnel_drvdata - specifics associated to a funnel component
	38	* @base: memory mapped base address for this component.
	39	* @dev: the device entity associated to this component.
2e5f75d1	40	* @atclk: optional clock for the core parts of the funnel.
6e21e345	41	* @csdev: component vitals needed by the framework.
6e21e345 PP	42	* @priority: port selection order.
	43	*/
	44	struct funnel_drvdata {
	45	void __iomem *base;
	46	struct device *dev;
2e5f75d1	47	struct clk *atclk;
6e21e345	48	struct coresight_device *csdev;
6e21e345 PP	49	unsigned long priority;
	50	};
	51
	52	static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
	53	{
	54	u32 functl;
	55
	56	CS_UNLOCK(drvdata->base);
	57
	58	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
	59	functl &= ~FUNNEL_HOLDTIME_MASK;
	60	functl \|= FUNNEL_HOLDTIME;
	61	functl \|= (1 << port);
	62	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
	63	writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
	64
	65	CS_LOCK(drvdata->base);
	66	}
	67
	68	static int funnel_enable(struct coresight_device *csdev, int inport,
	69	int outport)
	70	{
	71	struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
6e21e345 PP	72
	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);
6e21e345 PP	98
	99	dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
	100	}
	101
	102	static const struct coresight_ops_link funnel_link_ops = {
	103	.enable = funnel_enable,
	104	.disable = funnel_disable,
	105	};
	106
	107	static const struct coresight_ops funnel_cs_ops = {
	108	.link_ops = &funnel_link_ops,
	109	};
	110
	111	static ssize_t priority_show(struct device *dev,
	112	struct device_attribute attr, char buf)
	113	{
	114	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
	115	unsigned long val = drvdata->priority;
	116
	117	return sprintf(buf, "%#lx\n", val);
	118	}
	119
	120	static ssize_t priority_store(struct device *dev,
	121	struct device_attribute *attr,
	122	const char *buf, size_t size)
	123	{
	124	int ret;
	125	unsigned long val;
	126	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
	127
	128	ret = kstrtoul(buf, 16, &val);
	129	if (ret)
	130	return ret;
	131
	132	drvdata->priority = val;
	133	return size;
	134	}
	135	static DEVICE_ATTR_RW(priority);
	136
	137	static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
	138	{
	139	u32 functl;
	140
	141	CS_UNLOCK(drvdata->base);
	142	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
	143	CS_LOCK(drvdata->base);
	144
	145	return functl;
	146	}
	147
	148	static ssize_t funnel_ctrl_show(struct device *dev,
	149	struct device_attribute attr, char buf)
	150	{
6e21e345 PP	151	u32 val;
	152	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
	153
e2d08f96	154	pm_runtime_get_sync(drvdata->dev);
6e21e345 PP	155
6e21e345 PP	156	val = get_funnel_ctrl_hw(drvdata);
e2d08f96 LW	157
e2d08f96 LW	158	pm_runtime_put(drvdata->dev);
6e21e345 PP	159
	160	return sprintf(buf, "%#x\n", val);
	161	}
	162	static DEVICE_ATTR_RO(funnel_ctrl);
	163
	164	static struct attribute *coresight_funnel_attrs[] = {
	165	&dev_attr_funnel_ctrl.attr,
	166	&dev_attr_priority.attr,
	167	NULL,
	168	};
	169	ATTRIBUTE_GROUPS(coresight_funnel);
	170
	171	static int funnel_probe(struct amba_device adev, const struct amba_id id)
	172	{
2e5f75d1	173	int ret;
6e21e345 PP	174	void __iomem *base;
	175	struct device *dev = &adev->dev;
	176	struct coresight_platform_data *pdata = NULL;
	177	struct funnel_drvdata *drvdata;
	178	struct resource *res = &adev->res;
9486295a	179	struct coresight_desc desc = { 0 };
6e21e345 PP	180	struct device_node *np = adev->dev.of_node;
	181
	182	if (np) {
	183	pdata = of_get_coresight_platform_data(dev, np);
	184	if (IS_ERR(pdata))
	185	return PTR_ERR(pdata);
	186	adev->dev.platform_data = pdata;
	187	}
	188
	189	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	190	if (!drvdata)
	191	return -ENOMEM;
	192
	193	drvdata->dev = &adev->dev;
2e5f75d1 LW	194	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
	195	if (!IS_ERR(drvdata->atclk)) {
	196	ret = clk_prepare_enable(drvdata->atclk);
	197	if (ret)
	198	return ret;
	199	}
6e21e345 PP	200	dev_set_drvdata(dev, drvdata);
	201
	202	/* Validity for the resource is already checked by the AMBA core */
	203	base = devm_ioremap_resource(dev, res);
	204	if (IS_ERR(base))
	205	return PTR_ERR(base);
	206
	207	drvdata->base = base;
e2d08f96	208	pm_runtime_put(&adev->dev);
6e21e345	209
9486295a SP	210	desc.type = CORESIGHT_DEV_TYPE_LINK;
	211	desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
	212	desc.ops = &funnel_cs_ops;
	213	desc.pdata = pdata;
	214	desc.dev = dev;
	215	desc.groups = coresight_funnel_groups;
	216	drvdata->csdev = coresight_register(&desc);
6e21e345 PP	217	if (IS_ERR(drvdata->csdev))
	218	return PTR_ERR(drvdata->csdev);
	219
6e21e345 PP	220	return 0;
	221	}
	222
2e5f75d1 LW	223	#ifdef CONFIG_PM
	224	static int funnel_runtime_suspend(struct device *dev)
	225	{
	226	struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
	227
	228	if (drvdata && !IS_ERR(drvdata->atclk))
	229	clk_disable_unprepare(drvdata->atclk);
	230
	231	return 0;
	232	}
	233
	234	static int funnel_runtime_resume(struct device *dev)
	235	{
	236	struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
	237
	238	if (drvdata && !IS_ERR(drvdata->atclk))
	239	clk_prepare_enable(drvdata->atclk);
	240
	241	return 0;
	242	}
	243	#endif
	244
	245	static const struct dev_pm_ops funnel_dev_pm_ops = {
	246	SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
	247	};
	248
6e21e345 PP	249	static struct amba_id funnel_ids[] = {
	250	{
	251	.id = 0x0003b908,
	252	.mask = 0x0003ffff,
	253	},
	254	{ 0, 0},
	255	};
	256
	257	static struct amba_driver funnel_driver = {
	258	.drv = {
	259	.name = "coresight-funnel",
	260	.owner = THIS_MODULE,
2e5f75d1	261	.pm = &funnel_dev_pm_ops,
b15f0fb6	262	.suppress_bind_attrs = true,
6e21e345 PP	263	},
6e21e345 PP	264	.probe = funnel_probe,
6e21e345 PP	265	.id_table = funnel_ids,
6e21e345 PP	266	};
941943cf	267	builtin_amba_driver(funnel_driver);