summaryrefslogtreecommitdiff
path: root/include/linux/coresight.h
blob: e5421b83e4e6a74374911f0ebc089fa2c833de68 (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
259
260
261
262
263
264
265
266
267
268
269
270
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2012, The Linux Foundation. All rights reserved.
 */

#ifndef _LINUX_CORESIGHT_H
#define _LINUX_CORESIGHT_H

#include <linux/device.h>
#include <linux/perf_event.h>
#include <linux/sched.h>

/* Peripheral id registers (0xFD0-0xFEC) */
#define CORESIGHT_PERIPHIDR4	0xfd0
#define CORESIGHT_PERIPHIDR5	0xfd4
#define CORESIGHT_PERIPHIDR6	0xfd8
#define CORESIGHT_PERIPHIDR7	0xfdC
#define CORESIGHT_PERIPHIDR0	0xfe0
#define CORESIGHT_PERIPHIDR1	0xfe4
#define CORESIGHT_PERIPHIDR2	0xfe8
#define CORESIGHT_PERIPHIDR3	0xfeC
/* Component id registers (0xFF0-0xFFC) */
#define CORESIGHT_COMPIDR0	0xff0
#define CORESIGHT_COMPIDR1	0xff4
#define CORESIGHT_COMPIDR2	0xff8
#define CORESIGHT_COMPIDR3	0xffC

#define ETM_ARCH_V3_3		0x23
#define ETM_ARCH_V3_5		0x25
#define PFT_ARCH_V1_0		0x30
#define PFT_ARCH_V1_1		0x31

#define CORESIGHT_UNLOCK	0xc5acce55

extern struct bus_type coresight_bustype;

enum coresight_dev_type {
	CORESIGHT_DEV_TYPE_NONE,
	CORESIGHT_DEV_TYPE_SINK,
	CORESIGHT_DEV_TYPE_LINK,
	CORESIGHT_DEV_TYPE_LINKSINK,
	CORESIGHT_DEV_TYPE_SOURCE,
};

enum coresight_dev_subtype_sink {
	CORESIGHT_DEV_SUBTYPE_SINK_NONE,
	CORESIGHT_DEV_SUBTYPE_SINK_PORT,
	CORESIGHT_DEV_SUBTYPE_SINK_BUFFER,
};

enum coresight_dev_subtype_link {
	CORESIGHT_DEV_SUBTYPE_LINK_NONE,
	CORESIGHT_DEV_SUBTYPE_LINK_MERG,
	CORESIGHT_DEV_SUBTYPE_LINK_SPLIT,
	CORESIGHT_DEV_SUBTYPE_LINK_FIFO,
};

enum coresight_dev_subtype_source {
	CORESIGHT_DEV_SUBTYPE_SOURCE_NONE,
	CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
	CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
	CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
};

/**
 * struct coresight_dev_subtype - further characterisation of a type
 * @sink_subtype:	type of sink this component is, as defined
			by @coresight_dev_subtype_sink.
 * @link_subtype:	type of link this component is, as defined
			by @coresight_dev_subtype_link.
 * @source_subtype:	type of source this component is, as defined
			by @coresight_dev_subtype_source.
 */
struct coresight_dev_subtype {
	enum coresight_dev_subtype_sink sink_subtype;
	enum coresight_dev_subtype_link link_subtype;
	enum coresight_dev_subtype_source source_subtype;
};

/**
 * struct coresight_platform_data - data harvested from the DT specification
 * @cpu:	the CPU a source belongs to. Only applicable for ETM/PTMs.
 * @name:	name of the component as shown under sysfs.
 * @nr_inport:	number of input ports for this component.
 * @outports:	list of remote endpoint port number.
 * @child_names:name of all child components connected to this device.
 * @child_ports:child component port number the current component is
		connected  to.
 * @nr_outport:	number of output ports for this component.
 * @clk:	The clock this component is associated to.
 */
struct coresight_platform_data {
	int cpu;
	const char *name;
	int nr_inport;
	int *outports;
	const char **child_names;
	int *child_ports;
	int nr_outport;
	struct clk *clk;
};

/**
 * struct coresight_desc - description of a component required from drivers
 * @type:	as defined by @coresight_dev_type.
 * @subtype:	as defined by @coresight_dev_subtype.
 * @ops:	generic operations for this component, as defined
		by @coresight_ops.
 * @pdata:	platform data collected from DT.
 * @dev:	The device entity associated to this component.
 * @groups:	operations specific to this component. These will end up
		in the component's sysfs sub-directory.
 */
struct coresight_desc {
	enum coresight_dev_type type;
	struct coresight_dev_subtype subtype;
	const struct coresight_ops *ops;
	struct coresight_platform_data *pdata;
	struct device *dev;
	const struct attribute_group **groups;
};

/**
 * struct coresight_connection - representation of a single connection
 * @outport:	a connection's output port number.
 * @chid_name:	remote component's name.
 * @child_port:	remote component's port number @output is connected to.
 * @child_dev:	a @coresight_device representation of the component
		connected to @outport.
 */
struct coresight_connection {
	int outport;
	const char *child_name;
	int child_port;
	struct coresight_device *child_dev;
};

/**
 * struct coresight_device - representation of a device as used by the framework
 * @conns:	array of coresight_connections associated to this component.
 * @nr_inport:	number of input port associated to this component.
 * @nr_outport:	number of output port associated to this component.
 * @type:	as defined by @coresight_dev_type.
 * @subtype:	as defined by @coresight_dev_subtype.
 * @ops:	generic operations for this component, as defined
		by @coresight_ops.
 * @dev:	The device entity associated to this component.
 * @refcnt:	keep track of what is in use.
 * @orphan:	true if the component has connections that haven't been linked.
 * @enable:	'true' if component is currently part of an active path.
 * @activated:	'true' only if a _sink_ has been activated.  A sink can be
		activated but not yet enabled.  Enabling for a _sink_
		happens when a source has been selected for that it.
 */
struct coresight_device {
	struct coresight_connection *conns;
	int nr_inport;
	int nr_outport;
	enum coresight_dev_type type;
	struct coresight_dev_subtype subtype;
	const struct coresight_ops *ops;
	struct device dev;
	atomic_t *refcnt;
	bool orphan;
	bool enable;	/* true only if configured as part of a path */
	bool activated;	/* true only if a sink is part of a path */
};

#define to_coresight_device(d) container_of(d, struct coresight_device, dev)

#define source_ops(csdev)	csdev->ops->source_ops
#define sink_ops(csdev)		csdev->ops->sink_ops
#define link_ops(csdev)		csdev->ops->link_ops

/**
 * struct coresight_ops_sink - basic operations for a sink
 * Operations available for sinks
 * @enable:		enables the sink.
 * @disable:		disables the sink.
 * @alloc_buffer:	initialises perf's ring buffer for trace collection.
 * @free_buffer:	release memory allocated in @get_config.
 * @set_buffer:		initialises buffer mechanic before a trace session.
 * @reset_buffer:	finalises buffer mechanic after a trace session.
 * @update_buffer:	update buffer pointers after a trace session.
 */
struct coresight_ops_sink {
	int (*enable)(struct coresight_device *csdev, u32 mode);
	void (*disable)(struct coresight_device *csdev);
	void *(*alloc_buffer)(struct coresight_device *csdev, int cpu,
			      void **pages, int nr_pages, bool overwrite);
	void (*free_buffer)(void *config);
	int (*set_buffer)(struct coresight_device *csdev,
			  struct perf_output_handle *handle,
			  void *sink_config);
	unsigned long (*reset_buffer)(struct coresight_device *csdev,
				      struct perf_output_handle *handle,
				      void *sink_config);
	void (*update_buffer)(struct coresight_device *csdev,
			      struct perf_output_handle *handle,
			      void *sink_config);
};

/**
 * struct coresight_ops_link - basic operations for a link
 * Operations available for links.
 * @enable:	enables flow between iport and oport.
 * @disable:	disables flow between iport and oport.
 */
struct coresight_ops_link {
	int (*enable)(struct coresight_device *csdev, int iport, int oport);
	void (*disable)(struct coresight_device *csdev, int iport, int oport);
};

/**
 * struct coresight_ops_source - basic operations for a source
 * Operations available for sources.
 * @cpu_id:	returns the value of the CPU number this component
 *		is associated to.
 * @trace_id:	returns the value of the component's trace ID as known
 *		to the HW.
 * @enable:	enables tracing for a source.
 * @disable:	disables tracing for a source.
 */
struct coresight_ops_source {
	int (*cpu_id)(struct coresight_device *csdev);
	int (*trace_id)(struct coresight_device *csdev);
	int (*enable)(struct coresight_device *csdev,
		      struct perf_event *event,  u32 mode);
	void (*disable)(struct coresight_device *csdev,
			struct perf_event *event);
};

struct coresight_ops {
	const struct coresight_ops_sink *sink_ops;
	const struct coresight_ops_link *link_ops;
	const struct coresight_ops_source *source_ops;
};

#ifdef CONFIG_CORESIGHT
extern struct coresight_device *
coresight_register(struct coresight_desc *desc);
extern void coresight_unregister(struct coresight_device *csdev);
extern int coresight_enable(struct coresight_device *csdev);
extern void coresight_disable(struct coresight_device *csdev);
extern int coresight_timeout(void __iomem *addr, u32 offset,
			     int position, int value);
#else
static inline struct coresight_device *
coresight_register(struct coresight_desc *desc) { return NULL; }
static inline void coresight_unregister(struct coresight_device *csdev) {}
static inline int
coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
static inline void coresight_disable(struct coresight_device *csdev) {}
static inline int coresight_timeout(void __iomem *addr, u32 offset,
				     int position, int value) { return 1; }
#endif

#ifdef CONFIG_OF
extern int of_coresight_get_cpu(const struct device_node *node);
extern struct coresight_platform_data *
of_get_coresight_platform_data(struct device *dev,
			       const struct device_node *node);
#else
static inline int of_coresight_get_cpu(const struct device_node *node)
{ return 0; }
static inline struct coresight_platform_data *of_get_coresight_platform_data(
	struct device *dev, const struct device_node *node) { return NULL; }
#endif

#endif