[deliverable/linux.git] / drivers / hwtracing / 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/pm_runtime.h>
#include <linux/coresight.h>
#include <linux/amba/bus.h>
#include <linux/clk.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.
 * @atclk:	optional clock for the core parts of the TPIU.
 * @csdev:	component vitals needed by the framework.
 */
struct tpiu_drvdata {
	void __iomem		*base;
	struct device		*dev;
	struct clk		*atclk;
	struct coresight_device	*csdev;
};

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);

	pm_runtime_get_sync(csdev->dev.parent);
	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);
	pm_runtime_put(csdev->dev.parent);

	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;
	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;

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

	pm_runtime_put(&adev->dev);

	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;
}

#ifdef CONFIG_PM
static int tpiu_runtime_suspend(struct device *dev)
{
	struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);

	if (drvdata && !IS_ERR(drvdata->atclk))
		clk_disable_unprepare(drvdata->atclk);

	return 0;
}

static int tpiu_runtime_resume(struct device *dev)
{
	struct tpiu_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 tpiu_dev_pm_ops = {
	SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
};

static struct amba_id tpiu_ids[] = {
	{
		.id	= 0x0003b912,
		.mask	= 0x0003ffff,
	},
	{
		.id	= 0x0004b912,
		.mask	= 0x0007ffff,
	},
	{ 0, 0},
};

static struct amba_driver tpiu_driver = {
	.drv = {
		.name	= "coresight-tpiu",
		.owner	= THIS_MODULE,
		.pm	= &tpiu_dev_pm_ops,
	},
	.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>
b5913d64	20	#include <linux/pm_runtime.h>
dc161b9f PP	21	#include <linux/coresight.h>
dc161b9f PP	22	#include <linux/amba/bus.h>
db341d3d	23	#include <linux/clk.h>
dc161b9f PP	24
	25	#include "coresight-priv.h"
	26
	27	#define TPIU_SUPP_PORTSZ 0x000
	28	#define TPIU_CURR_PORTSZ 0x004
	29	#define TPIU_SUPP_TRIGMODES 0x100
	30	#define TPIU_TRIG_CNTRVAL 0x104
	31	#define TPIU_TRIG_MULT 0x108
	32	#define TPIU_SUPP_TESTPATM 0x200
	33	#define TPIU_CURR_TESTPATM 0x204
	34	#define TPIU_TEST_PATREPCNTR 0x208
	35	#define TPIU_FFSR 0x300
	36	#define TPIU_FFCR 0x304
	37	#define TPIU_FSYNC_CNTR 0x308
	38	#define TPIU_EXTCTL_INPORT 0x400
	39	#define TPIU_EXTCTL_OUTPORT 0x404
	40	#define TPIU_ITTRFLINACK 0xee4
	41	#define TPIU_ITTRFLIN 0xee8
	42	#define TPIU_ITATBDATA0 0xeec
	43	#define TPIU_ITATBCTR2 0xef0
	44	#define TPIU_ITATBCTR1 0xef4
	45	#define TPIU_ITATBCTR0 0xef8
	46
	47	/ register definition /
	48	/* FFCR - 0x304 */
	49	#define FFCR_FON_MAN BIT(6)
	50
	51	/**
	52	* @base: memory mapped base address for this component.
	53	* @dev: the device entity associated to this component.
db341d3d	54	* @atclk: optional clock for the core parts of the TPIU.
dc161b9f	55	* @csdev: component vitals needed by the framework.
dc161b9f PP	56	*/
	57	struct tpiu_drvdata {
	58	void __iomem *base;
	59	struct device *dev;
db341d3d	60	struct clk *atclk;
dc161b9f	61	struct coresight_device *csdev;
dc161b9f PP	62	};
	63
	64	static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
	65	{
	66	CS_UNLOCK(drvdata->base);
	67
	68	/* TODO: fill this up */
	69
	70	CS_LOCK(drvdata->base);
	71	}
	72
	73	static int tpiu_enable(struct coresight_device *csdev)
	74	{
	75	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
dc161b9f	76
b5913d64	77	pm_runtime_get_sync(csdev->dev.parent);
dc161b9f PP	78	tpiu_enable_hw(drvdata);
	79
	80	dev_info(drvdata->dev, "TPIU enabled\n");
	81	return 0;
	82	}
	83
	84	static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
	85	{
	86	CS_UNLOCK(drvdata->base);
	87
	88	/* Clear formatter controle reg. */
	89	writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
	90	/* Generate manual flush */
	91	writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
	92
	93	CS_LOCK(drvdata->base);
	94	}
	95
	96	static void tpiu_disable(struct coresight_device *csdev)
	97	{
	98	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
	99
	100	tpiu_disable_hw(drvdata);
b5913d64	101	pm_runtime_put(csdev->dev.parent);
dc161b9f PP	102
	103	dev_info(drvdata->dev, "TPIU disabled\n");
	104	}
	105
	106	static const struct coresight_ops_sink tpiu_sink_ops = {
	107	.enable = tpiu_enable,
	108	.disable = tpiu_disable,
	109	};
	110
	111	static const struct coresight_ops tpiu_cs_ops = {
	112	.sink_ops = &tpiu_sink_ops,
	113	};
	114
	115	static int tpiu_probe(struct amba_device adev, const struct amba_id id)
	116	{
db341d3d	117	int ret;
dc161b9f PP	118	void __iomem *base;
	119	struct device *dev = &adev->dev;
	120	struct coresight_platform_data *pdata = NULL;
	121	struct tpiu_drvdata *drvdata;
	122	struct resource *res = &adev->res;
	123	struct coresight_desc *desc;
	124	struct device_node *np = adev->dev.of_node;
	125
	126	if (np) {
	127	pdata = of_get_coresight_platform_data(dev, np);
	128	if (IS_ERR(pdata))
	129	return PTR_ERR(pdata);
	130	adev->dev.platform_data = pdata;
	131	}
	132
	133	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	134	if (!drvdata)
	135	return -ENOMEM;
	136
	137	drvdata->dev = &adev->dev;
db341d3d LW	138	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
	139	if (!IS_ERR(drvdata->atclk)) {
	140	ret = clk_prepare_enable(drvdata->atclk);
	141	if (ret)
	142	return ret;
	143	}
dc161b9f PP	144	dev_set_drvdata(dev, drvdata);
	145
	146	/* Validity for the resource is already checked by the AMBA core */
	147	base = devm_ioremap_resource(dev, res);
	148	if (IS_ERR(base))
	149	return PTR_ERR(base);
	150
	151	drvdata->base = base;
	152
dc161b9f PP	153	/* Disable tpiu to support older devices */
	154	tpiu_disable_hw(drvdata);
	155
b5913d64	156	pm_runtime_put(&adev->dev);
dc161b9f PP	157
	158	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
	159	if (!desc)
	160	return -ENOMEM;
	161
	162	desc->type = CORESIGHT_DEV_TYPE_SINK;
	163	desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
	164	desc->ops = &tpiu_cs_ops;
	165	desc->pdata = pdata;
	166	desc->dev = dev;
	167	drvdata->csdev = coresight_register(desc);
	168	if (IS_ERR(drvdata->csdev))
	169	return PTR_ERR(drvdata->csdev);
	170
	171	dev_info(dev, "TPIU initialized\n");
	172	return 0;
	173	}
	174
	175	static int tpiu_remove(struct amba_device *adev)
	176	{
	177	struct tpiu_drvdata *drvdata = amba_get_drvdata(adev);
	178
	179	coresight_unregister(drvdata->csdev);
	180	return 0;
	181	}
	182
db341d3d LW	183	#ifdef CONFIG_PM
	184	static int tpiu_runtime_suspend(struct device *dev)
	185	{
	186	struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
	187
	188	if (drvdata && !IS_ERR(drvdata->atclk))
	189	clk_disable_unprepare(drvdata->atclk);
	190
	191	return 0;
	192	}
	193
	194	static int tpiu_runtime_resume(struct device *dev)
	195	{
	196	struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
	197
	198	if (drvdata && !IS_ERR(drvdata->atclk))
	199	clk_prepare_enable(drvdata->atclk);
	200
	201	return 0;
	202	}
	203	#endif
	204
	205	static const struct dev_pm_ops tpiu_dev_pm_ops = {
	206	SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
	207	};
	208
dc161b9f PP	209	static struct amba_id tpiu_ids[] = {
	210	{
	211	.id = 0x0003b912,
	212	.mask = 0x0003ffff,
	213	},
4339b699 LW	214	{
	215	.id = 0x0004b912,
	216	.mask = 0x0007ffff,
	217	},
dc161b9f PP	218	{ 0, 0},
	219	};
	220
	221	static struct amba_driver tpiu_driver = {
	222	.drv = {
	223	.name = "coresight-tpiu",
	224	.owner = THIS_MODULE,
db341d3d	225	.pm = &tpiu_dev_pm_ops,
dc161b9f PP	226	},
	227	.probe = tpiu_probe,
	228	.remove = tpiu_remove,
	229	.id_table = tpiu_ids,
	230	};
	231
3ff7ca05	232	module_amba_driver(tpiu_driver);
dc161b9f PP	233
	234	MODULE_LICENSE("GPL v2");
	235	MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver");