[linux-2.6-block.git] / drivers / coresight / coresight-tpiu.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/device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/coresight.h>
#include <linux/amba/bus.h>

#include "coresight-priv.h"

#define TPIU_SUPP_PORTSZ	0x000
#define TPIU_CURR_PORTSZ	0x004
#define TPIU_SUPP_TRIGMODES	0x100
#define TPIU_TRIG_CNTRVAL	0x104
#define TPIU_TRIG_MULT		0x108
#define TPIU_SUPP_TESTPATM	0x200
#define TPIU_CURR_TESTPATM	0x204
#define TPIU_TEST_PATREPCNTR	0x208
#define TPIU_FFSR		0x300
#define TPIU_FFCR		0x304
#define TPIU_FSYNC_CNTR		0x308
#define TPIU_EXTCTL_INPORT	0x400
#define TPIU_EXTCTL_OUTPORT	0x404
#define TPIU_ITTRFLINACK	0xee4
#define TPIU_ITTRFLIN		0xee8
#define TPIU_ITATBDATA0		0xeec
#define TPIU_ITATBCTR2		0xef0
#define TPIU_ITATBCTR1		0xef4
#define TPIU_ITATBCTR0		0xef8

/** register definition **/
/* FFCR - 0x304 */
#define FFCR_FON_MAN		BIT(6)

/**
 * @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.
 */
struct tpiu_drvdata {
	void __iomem		*base;
	struct device		*dev;
	struct coresight_device	*csdev;
	struct clk		*clk;
};

static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
{
	CS_UNLOCK(drvdata->base);

	/* TODO: fill this up */

	CS_LOCK(drvdata->base);
}

static int tpiu_enable(struct coresight_device *csdev)
{
	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
	int ret;

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

	tpiu_enable_hw(drvdata);

	dev_info(drvdata->dev, "TPIU enabled\n");
	return 0;
}

static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
{
	CS_UNLOCK(drvdata->base);

	/* Clear formatter controle reg. */
	writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
	/* Generate manual flush */
	writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);

	CS_LOCK(drvdata->base);
}

static void tpiu_disable(struct coresight_device *csdev)
{
	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

	tpiu_disable_hw(drvdata);

	clk_disable_unprepare(drvdata->clk);

	dev_info(drvdata->dev, "TPIU disabled\n");
}

static const struct coresight_ops_sink tpiu_sink_ops = {
	.enable		= tpiu_enable,
	.disable	= tpiu_disable,
};

static const struct coresight_ops tpiu_cs_ops = {
	.sink_ops	= &tpiu_sink_ops,
};

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

	/* Disable tpiu to support older devices */
	tpiu_disable_hw(drvdata);

	clk_disable_unprepare(drvdata->clk);

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

	desc->type = CORESIGHT_DEV_TYPE_SINK;
	desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
	desc->ops = &tpiu_cs_ops;
	desc->pdata = pdata;
	desc->dev = dev;
	drvdata->csdev = coresight_register(desc);
	if (IS_ERR(drvdata->csdev))
		return PTR_ERR(drvdata->csdev);

	dev_info(dev, "TPIU initialized\n");
	return 0;
}

static int tpiu_remove(struct amba_device *adev)
{
	struct tpiu_drvdata *drvdata = amba_get_drvdata(adev);

	coresight_unregister(drvdata->csdev);
	return 0;
}

static struct amba_id tpiu_ids[] = {
	{
		.id	= 0x0003b912,
		.mask	= 0x0003ffff,
	},
	{ 0, 0},
};

static struct amba_driver tpiu_driver = {
	.drv = {
		.name	= "coresight-tpiu",
		.owner	= THIS_MODULE,
	},
	.probe		= tpiu_probe,
	.remove		= tpiu_remove,
	.id_table	= tpiu_ids,
};

module_amba_driver(tpiu_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver");
Commit	Line	Data
dc161b9f 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/device.h>
	17	#include <linux/io.h>
	18	#include <linux/err.h>
	19	#include <linux/slab.h>
	20	#include <linux/clk.h>
	21	#include <linux/coresight.h>
	22	#include <linux/amba/bus.h>
	23
	24	#include "coresight-priv.h"
	25
	26	#define TPIU_SUPP_PORTSZ 0x000
	27	#define TPIU_CURR_PORTSZ 0x004
	28	#define TPIU_SUPP_TRIGMODES 0x100
	29	#define TPIU_TRIG_CNTRVAL 0x104
	30	#define TPIU_TRIG_MULT 0x108
	31	#define TPIU_SUPP_TESTPATM 0x200
	32	#define TPIU_CURR_TESTPATM 0x204
	33	#define TPIU_TEST_PATREPCNTR 0x208
	34	#define TPIU_FFSR 0x300
	35	#define TPIU_FFCR 0x304
	36	#define TPIU_FSYNC_CNTR 0x308
	37	#define TPIU_EXTCTL_INPORT 0x400
	38	#define TPIU_EXTCTL_OUTPORT 0x404
	39	#define TPIU_ITTRFLINACK 0xee4
	40	#define TPIU_ITTRFLIN 0xee8
	41	#define TPIU_ITATBDATA0 0xeec
	42	#define TPIU_ITATBCTR2 0xef0
	43	#define TPIU_ITATBCTR1 0xef4
	44	#define TPIU_ITATBCTR0 0xef8
	45
	46	/ register definition /
	47	/* FFCR - 0x304 */
	48	#define FFCR_FON_MAN BIT(6)
	49
	50	/**
	51	* @base: memory mapped base address for this component.
	52	* @dev: the device entity associated to this component.
	53	* @csdev: component vitals needed by the framework.
	54	* @clk: the clock this component is associated to.
	55	*/
	56	struct tpiu_drvdata {
	57	void __iomem *base;
	58	struct device *dev;
	59	struct coresight_device *csdev;
	60	struct clk *clk;
	61	};
	62
	63	static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
	64	{
65	CS_UNLOCK(drvdata->base);
66
67	/* TODO: fill this up */
68
69	CS_LOCK(drvdata->base);
70	}
71
72	static int tpiu_enable(struct coresight_device *csdev)
73	{
74	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
75	int ret;
76
77	ret = clk_prepare_enable(drvdata->clk);
78	if (ret)
79	return ret;
80
81	tpiu_enable_hw(drvdata);
82
83	dev_info(drvdata->dev, "TPIU enabled\n");
84	return 0;
85	}
86
87	static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
88	{
89	CS_UNLOCK(drvdata->base);
90
91	/* Clear formatter controle reg. */
92	writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
93	/* Generate manual flush */
94	writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
95
96	CS_LOCK(drvdata->base);
97	}
98
99	static void tpiu_disable(struct coresight_device *csdev)
100	{
101	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
102
103	tpiu_disable_hw(drvdata);
104
105	clk_disable_unprepare(drvdata->clk);
106
107	dev_info(drvdata->dev, "TPIU disabled\n");
108	}
109
110	static const struct coresight_ops_sink tpiu_sink_ops = {
111	.enable = tpiu_enable,
112	.disable = tpiu_disable,
113	};
114
115	static const struct coresight_ops tpiu_cs_ops = {
116	.sink_ops = &tpiu_sink_ops,
117	};
118
119	static int tpiu_probe(struct amba_device adev, const struct amba_id id)
120	{
121	int ret;
122	void __iomem *base;
123	struct device *dev = &adev->dev;
124	struct coresight_platform_data *pdata = NULL;
125	struct tpiu_drvdata *drvdata;
126	struct resource *res = &adev->res;
127	struct coresight_desc *desc;
128	struct device_node *np = adev->dev.of_node;
129
130	if (np) {
131	pdata = of_get_coresight_platform_data(dev, np);
132	if (IS_ERR(pdata))
133	return PTR_ERR(pdata);
134	adev->dev.platform_data = pdata;
135	}
136
137	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
138	if (!drvdata)
139	return -ENOMEM;
140
141	drvdata->dev = &adev->dev;
142	dev_set_drvdata(dev, drvdata);
143
144	/* Validity for the resource is already checked by the AMBA core */
145	base = devm_ioremap_resource(dev, res);
146	if (IS_ERR(base))
147	return PTR_ERR(base);
148
149	drvdata->base = base;
150
151	drvdata->clk = adev->pclk;
152	ret = clk_prepare_enable(drvdata->clk);
153	if (ret)
154	return ret;
155
156	/* Disable tpiu to support older devices */
157	tpiu_disable_hw(drvdata);
158
159	clk_disable_unprepare(drvdata->clk);
160
161	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
162	if (!desc)
163	return -ENOMEM;
164
165	desc->type = CORESIGHT_DEV_TYPE_SINK;
166	desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
167	desc->ops = &tpiu_cs_ops;
168	desc->pdata = pdata;
169	desc->dev = dev;
170	drvdata->csdev = coresight_register(desc);
171	if (IS_ERR(drvdata->csdev))
172	return PTR_ERR(drvdata->csdev);
173
174	dev_info(dev, "TPIU initialized\n");
175	return 0;
176	}
177
178	static int tpiu_remove(struct amba_device *adev)
179	{
180	struct tpiu_drvdata *drvdata = amba_get_drvdata(adev);
181
182	coresight_unregister(drvdata->csdev);
183	return 0;
184	}
185
186	static struct amba_id tpiu_ids[] = {
187	{
188	.id = 0x0003b912,
189	.mask = 0x0003ffff,
190	},
191	{ 0, 0},
192	};
193
194	static struct amba_driver tpiu_driver = {
195	.drv = {
196	.name = "coresight-tpiu",
197	.owner = THIS_MODULE,
198	},
199	.probe = tpiu_probe,
200	.remove = tpiu_remove,
201	.id_table = tpiu_ids,
202	};
203
3ff7ca05	204	module_amba_driver(tpiu_driver);
dc161b9f PP	205
	206	MODULE_LICENSE("GPL v2");
	207	MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver");