summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/hwtracing/coresight/coresight-funnel.c
blob: 3db36f70b6662f3be300df2a4270df7edaecd09e (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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/* 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/clk.h>
#include <linux/coresight.h>
#include <linux/amba/bus.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.
 * @csdev:	component vitals needed by the framework.
 * @clk:	the clock this component is associated to.
 * @priority:	port selection order.
 */
struct funnel_drvdata {
	void __iomem		*base;
	struct device		*dev;
	struct coresight_device	*csdev;
	struct clk		*clk;
	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);
	int ret;

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

	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);

	clk_disable_unprepare(drvdata->clk);

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

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

	val = get_funnel_ctrl_hw(drvdata);
	clk_disable_unprepare(drvdata->clk);

	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)
{
	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;
	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;

	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;
}

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,
	},
	.probe		= funnel_probe,
	.remove		= funnel_remove,
	.id_table	= funnel_ids,
};

module_amba_driver(funnel_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Funnel driver");