summaryrefslogtreecommitdiff
path: root/drivers/hwtracing/coresight/coresight-tpiu.c
blob: d7a3e453016d8d5dafaa0ab69a4f676b088950c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
 *
 * Description: CoreSight Trace Port Interface Unit 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/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, u32 mode)
{
	struct tpiu_drvdata *drvdata = dev_get_drvdata(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);

	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 = { 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;

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

	pm_runtime_put(&adev->dev);

	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);

	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 const struct amba_id tpiu_ids[] = {
	{
		.id	= 0x0003b912,
		.mask	= 0x0003ffff,
	},
	{
		.id	= 0x0004b912,
		.mask	= 0x0007ffff,
	},
	{
		/* Coresight SoC-600 */
		.id	= 0x000bb9e7,
		.mask	= 0x000fffff,
	},
	{ 0, 0},
};

static struct amba_driver tpiu_driver = {
	.drv = {
		.name	= "coresight-tpiu",
		.owner	= THIS_MODULE,
		.pm	= &tpiu_dev_pm_ops,
		.suppress_bind_attrs = true,
	},
	.probe		= tpiu_probe,
	.id_table	= tpiu_ids,
};
builtin_amba_driver(tpiu_driver);