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1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (c) 2012, The Linux Foundation. All rights reserved.
4  */
5 
6 #ifndef _LINUX_CORESIGHT_H
7 #define _LINUX_CORESIGHT_H
8 
9 #include <linux/amba/bus.h>
10 #include <linux/clk.h>
11 #include <linux/device.h>
12 #include <linux/io.h>
13 #include <linux/perf_event.h>
14 #include <linux/sched.h>
15 #include <linux/platform_device.h>
16 #include <linux/android_kabi.h>
17 
18 /* Peripheral id registers (0xFD0-0xFEC) */
19 #define CORESIGHT_PERIPHIDR4	0xfd0
20 #define CORESIGHT_PERIPHIDR5	0xfd4
21 #define CORESIGHT_PERIPHIDR6	0xfd8
22 #define CORESIGHT_PERIPHIDR7	0xfdC
23 #define CORESIGHT_PERIPHIDR0	0xfe0
24 #define CORESIGHT_PERIPHIDR1	0xfe4
25 #define CORESIGHT_PERIPHIDR2	0xfe8
26 #define CORESIGHT_PERIPHIDR3	0xfeC
27 /* Component id registers (0xFF0-0xFFC) */
28 #define CORESIGHT_COMPIDR0	0xff0
29 #define CORESIGHT_COMPIDR1	0xff4
30 #define CORESIGHT_COMPIDR2	0xff8
31 #define CORESIGHT_COMPIDR3	0xffC
32 
33 #define ETM_ARCH_V3_3		0x23
34 #define ETM_ARCH_V3_5		0x25
35 #define PFT_ARCH_V1_0		0x30
36 #define PFT_ARCH_V1_1		0x31
37 
38 #define CORESIGHT_UNLOCK	0xc5acce55
39 
40 extern const struct bus_type coresight_bustype;
41 
42 enum coresight_dev_type {
43 	CORESIGHT_DEV_TYPE_SINK,
44 	CORESIGHT_DEV_TYPE_LINK,
45 	CORESIGHT_DEV_TYPE_LINKSINK,
46 	CORESIGHT_DEV_TYPE_SOURCE,
47 	CORESIGHT_DEV_TYPE_HELPER,
48 	CORESIGHT_DEV_TYPE_MAX
49 };
50 
51 enum coresight_dev_subtype_sink {
52 	CORESIGHT_DEV_SUBTYPE_SINK_DUMMY,
53 	CORESIGHT_DEV_SUBTYPE_SINK_PORT,
54 	CORESIGHT_DEV_SUBTYPE_SINK_BUFFER,
55 	CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM,
56 	CORESIGHT_DEV_SUBTYPE_SINK_PERCPU_SYSMEM,
57 };
58 
59 enum coresight_dev_subtype_link {
60 	CORESIGHT_DEV_SUBTYPE_LINK_MERG,
61 	CORESIGHT_DEV_SUBTYPE_LINK_SPLIT,
62 	CORESIGHT_DEV_SUBTYPE_LINK_FIFO,
63 };
64 
65 enum coresight_dev_subtype_source {
66 	CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
67 	CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
68 	CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
69 	CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM,
70 	CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS,
71 };
72 
73 enum coresight_dev_subtype_helper {
74 	CORESIGHT_DEV_SUBTYPE_HELPER_CATU,
75 	CORESIGHT_DEV_SUBTYPE_HELPER_ECT_CTI
76 };
77 
78 /**
79  * union coresight_dev_subtype - further characterisation of a type
80  * @sink_subtype:	type of sink this component is, as defined
81  *			by @coresight_dev_subtype_sink.
82  * @link_subtype:	type of link this component is, as defined
83  *			by @coresight_dev_subtype_link.
84  * @source_subtype:	type of source this component is, as defined
85  *			by @coresight_dev_subtype_source.
86  * @helper_subtype:	type of helper this component is, as defined
87  *			by @coresight_dev_subtype_helper.
88  */
89 union coresight_dev_subtype {
90 	/* We have some devices which acts as LINK and SINK */
91 	struct {
92 		enum coresight_dev_subtype_sink sink_subtype;
93 		enum coresight_dev_subtype_link link_subtype;
94 	};
95 	enum coresight_dev_subtype_source source_subtype;
96 	enum coresight_dev_subtype_helper helper_subtype;
97 };
98 
99 /**
100  * struct coresight_platform_data - data harvested from the firmware
101  * specification.
102  *
103  * @nr_inconns: Number of elements for the input connections.
104  * @nr_outconns: Number of elements for the output connections.
105  * @out_conns: Array of nr_outconns pointers to connections from this
106  *	       component.
107  * @in_conns: Sparse array of pointers to input connections. Sparse
108  *            because the source device owns the connection so when it's
109  *            unloaded the connection leaves an empty slot.
110  */
111 struct coresight_platform_data {
112 	int nr_inconns;
113 	int nr_outconns;
114 	struct coresight_connection **out_conns;
115 	struct coresight_connection **in_conns;
116 };
117 
118 /**
119  * struct csdev_access - Abstraction of a CoreSight device access.
120  *
121  * @io_mem	: True if the device has memory mapped I/O
122  * @base	: When io_mem == true, base address of the component
123  * @read	: Read from the given "offset" of the given instance.
124  * @write	: Write "val" to the given "offset".
125  */
126 struct csdev_access {
127 	bool io_mem;
128 	union {
129 		void __iomem *base;
130 		struct {
131 			u64 (*read)(u32 offset, bool relaxed, bool _64bit);
132 			void (*write)(u64 val, u32 offset, bool relaxed,
133 				      bool _64bit);
134 		};
135 	};
136 };
137 
138 #define CSDEV_ACCESS_IOMEM(_addr)		\
139 	((struct csdev_access)	{		\
140 		.io_mem		= true,		\
141 		.base		= (_addr),	\
142 	})
143 
144 /**
145  * struct coresight_desc - description of a component required from drivers
146  * @type:	as defined by @coresight_dev_type.
147  * @subtype:	as defined by @coresight_dev_subtype.
148  * @ops:	generic operations for this component, as defined
149  *		by @coresight_ops.
150  * @pdata:	platform data collected from DT.
151  * @dev:	The device entity associated to this component.
152  * @groups:	operations specific to this component. These will end up
153  *		in the component's sysfs sub-directory.
154  * @name:	name for the coresight device, also shown under sysfs.
155  * @access:	Describe access to the device
156  */
157 struct coresight_desc {
158 	enum coresight_dev_type type;
159 	union coresight_dev_subtype subtype;
160 	const struct coresight_ops *ops;
161 	struct coresight_platform_data *pdata;
162 	struct device *dev;
163 	const struct attribute_group **groups;
164 	const char *name;
165 	struct csdev_access access;
166 	ANDROID_KABI_RESERVE(1);
167 };
168 
169 /**
170  * struct coresight_connection - representation of a single connection
171  * @src_port:	a connection's output port number.
172  * @dest_port:	destination's input port number @src_port is connected to.
173  * @dest_fwnode: destination component's fwnode handle.
174  * @dest_dev:	a @coresight_device representation of the component
175 		connected to @src_port. NULL until the device is created
176  * @link: Representation of the connection as a sysfs link.
177  *
178  * The full connection structure looks like this, where in_conns store
179  * references to same connection as the source device's out_conns.
180  *
181  * +-----------------------------+   +-----------------------------+
182  * |coresight_device             |   |coresight_connection         |
183  * |-----------------------------|   |-----------------------------|
184  * |                             |   |                             |
185  * |                             |   |                    dest_dev*|<--
186  * |pdata->out_conns[nr_outconns]|<->|src_dev*                     |   |
187  * |                             |   |                             |   |
188  * +-----------------------------+   +-----------------------------+   |
189  *                                                                     |
190  *                                   +-----------------------------+   |
191  *                                   |coresight_device             |   |
192  *                                   |------------------------------   |
193  *                                   |                             |   |
194  *                                   |  pdata->in_conns[nr_inconns]|<--
195  *                                   |                             |
196  *                                   +-----------------------------+
197  */
198 struct coresight_connection {
199 	int src_port;
200 	int dest_port;
201 	struct fwnode_handle *dest_fwnode;
202 	struct coresight_device *dest_dev;
203 	struct coresight_sysfs_link *link;
204 	struct coresight_device *src_dev;
205 	atomic_t src_refcnt;
206 	atomic_t dest_refcnt;
207 
208 	ANDROID_KABI_RESERVE(1);
209 };
210 
211 /**
212  * struct coresight_sysfs_link - representation of a connection in sysfs.
213  * @orig:		Originating (master) coresight device for the link.
214  * @orig_name:		Name to use for the link orig->target.
215  * @target:		Target (slave) coresight device for the link.
216  * @target_name:	Name to use for the link target->orig.
217  */
218 struct coresight_sysfs_link {
219 	struct coresight_device *orig;
220 	const char *orig_name;
221 	struct coresight_device *target;
222 	const char *target_name;
223 };
224 
225 /* architecturally we have 128 IDs some of which are reserved */
226 #define CORESIGHT_TRACE_IDS_MAX 128
227 
228 /**
229  * Trace ID map.
230  *
231  * @used_ids:	Bitmap to register available (bit = 0) and in use (bit = 1) IDs.
232  *		Initialised so that the reserved IDs are permanently marked as
233  *		in use.
234  * @perf_cs_etm_session_active: Number of Perf sessions using this ID map.
235  */
236 struct coresight_trace_id_map {
237 	DECLARE_BITMAP(used_ids, CORESIGHT_TRACE_IDS_MAX);
238 	atomic_t __percpu *cpu_map;
239 	atomic_t perf_cs_etm_session_active;
240 	spinlock_t lock;
241 };
242 
243 /**
244  * struct coresight_device - representation of a device as used by the framework
245  * @pdata:	Platform data with device connections associated to this device.
246  * @type:	as defined by @coresight_dev_type.
247  * @subtype:	as defined by @coresight_dev_subtype.
248  * @ops:	generic operations for this component, as defined
249  *		by @coresight_ops.
250  * @access:	Device i/o access abstraction for this device.
251  * @dev:	The device entity associated to this component.
252  * @mode:	This tracer's mode, i.e sysFS, Perf or disabled. This is
253  *		actually an 'enum cs_mode', but is stored in an atomic type.
254  *		This is always accessed through local_read() and local_set(),
255  *		but wherever it's done from within the Coresight device's lock,
256  *		a non-atomic read would also work. This is the main point of
257  *		synchronisation between code happening inside the sysfs mode's
258  *		coresight_mutex and outside when running in Perf mode. A compare
259  *		and exchange swap is done to atomically claim one mode or the
260  *		other.
261  * @refcnt:	keep track of what is in use. Only access this outside of the
262  *		device's spinlock when the coresight_mutex held and mode ==
263  *		CS_MODE_SYSFS. Otherwise it must be accessed from inside the
264  *		spinlock.
265  * @orphan:	true if the component has connections that haven't been linked.
266  * @sysfs_sink_activated: 'true' when a sink has been selected for use via sysfs
267  *		by writing a 1 to the 'enable_sink' file.  A sink can be
268  *		activated but not yet enabled.  Enabling for a _sink_ happens
269  *		when a source has been selected and a path is enabled from
270  *		source to that sink. A sink can also become enabled but not
271  *		activated if it's used via Perf.
272  * @ea:		Device attribute for sink representation under PMU directory.
273  * @def_sink:	cached reference to default sink found for this device.
274  * @nr_links:   number of sysfs links created to other components from this
275  *		device. These will appear in the "connections" group.
276  * @has_conns_grp: Have added a "connections" group for sysfs links.
277  * @feature_csdev_list: List of complex feature programming added to the device.
278  * @config_csdev_list:  List of system configurations added to the device.
279  * @cscfg_csdev_lock:	Protect the lists of configurations and features.
280  * @active_cscfg_ctxt:  Context information for current active system configuration.
281  */
282 struct coresight_device {
283 	struct coresight_platform_data *pdata;
284 	enum coresight_dev_type type;
285 	union coresight_dev_subtype subtype;
286 	const struct coresight_ops *ops;
287 	struct csdev_access access;
288 	struct device dev;
289 	local_t	mode;
290 	int refcnt;
291 	bool orphan;
292 	/* sink specific fields */
293 	bool sysfs_sink_activated;
294 	struct dev_ext_attribute *ea;
295 	struct coresight_device *def_sink;
296 	struct coresight_trace_id_map perf_sink_id_map;
297 	/* sysfs links between components */
298 	int nr_links;
299 	bool has_conns_grp;
300 	/* system configuration and feature lists */
301 	struct list_head feature_csdev_list;
302 	struct list_head config_csdev_list;
303 	spinlock_t cscfg_csdev_lock;
304 	void *active_cscfg_ctxt;
305 	ANDROID_KABI_RESERVE(1);
306 	ANDROID_KABI_RESERVE(2);
307 };
308 
309 /*
310  * coresight_dev_list - Mapping for devices to "name" index for device
311  * names.
312  *
313  * @nr_idx:		Number of entries already allocated.
314  * @pfx:		Prefix pattern for device name.
315  * @fwnode_list:	Array of fwnode_handles associated with each allocated
316  *			index, upto nr_idx entries.
317  */
318 struct coresight_dev_list {
319 	int			nr_idx;
320 	const char		*pfx;
321 	struct fwnode_handle	**fwnode_list;
322 };
323 
324 #define DEFINE_CORESIGHT_DEVLIST(var, dev_pfx)				\
325 static struct coresight_dev_list (var) = {				\
326 						.pfx = dev_pfx,		\
327 						.nr_idx = 0,		\
328 						.fwnode_list = NULL,	\
329 }
330 
331 #define to_coresight_device(d) container_of(d, struct coresight_device, dev)
332 
333 enum cs_mode {
334 	CS_MODE_DISABLED,
335 	CS_MODE_SYSFS,
336 	CS_MODE_PERF,
337 };
338 
339 #define source_ops(csdev)	csdev->ops->source_ops
340 #define sink_ops(csdev)		csdev->ops->sink_ops
341 #define link_ops(csdev)		csdev->ops->link_ops
342 #define helper_ops(csdev)	csdev->ops->helper_ops
343 #define ect_ops(csdev)		csdev->ops->ect_ops
344 
345 /**
346  * struct coresight_ops_sink - basic operations for a sink
347  * Operations available for sinks
348  * @enable:		enables the sink.
349  * @disable:		disables the sink.
350  * @alloc_buffer:	initialises perf's ring buffer for trace collection.
351  * @free_buffer:	release memory allocated in @get_config.
352  * @update_buffer:	update buffer pointers after a trace session.
353  */
354 struct coresight_ops_sink {
355 	int (*enable)(struct coresight_device *csdev, enum cs_mode mode,
356 		      void *data);
357 	int (*disable)(struct coresight_device *csdev);
358 	void *(*alloc_buffer)(struct coresight_device *csdev,
359 			      struct perf_event *event, void **pages,
360 			      int nr_pages, bool overwrite);
361 	void (*free_buffer)(void *config);
362 	unsigned long (*update_buffer)(struct coresight_device *csdev,
363 			      struct perf_output_handle *handle,
364 			      void *sink_config);
365 	ANDROID_KABI_RESERVE(1);
366 };
367 
368 /**
369  * struct coresight_ops_link - basic operations for a link
370  * Operations available for links.
371  * @enable:	enables flow between iport and oport.
372  * @disable:	disables flow between iport and oport.
373  */
374 struct coresight_ops_link {
375 	int (*enable)(struct coresight_device *csdev,
376 		      struct coresight_connection *in,
377 		      struct coresight_connection *out);
378 	void (*disable)(struct coresight_device *csdev,
379 			struct coresight_connection *in,
380 			struct coresight_connection *out);
381 };
382 
383 /**
384  * struct coresight_ops_source - basic operations for a source
385  * Operations available for sources.
386  * @cpu_id:	returns the value of the CPU number this component
387  *		is associated to.
388  * @enable:	enables tracing for a source.
389  * @disable:	disables tracing for a source.
390  */
391 struct coresight_ops_source {
392 	int (*cpu_id)(struct coresight_device *csdev);
393 	int (*enable)(struct coresight_device *csdev, struct perf_event *event,
394 		      enum cs_mode mode, struct coresight_trace_id_map *id_map);
395 	void (*disable)(struct coresight_device *csdev,
396 			struct perf_event *event);
397 	ANDROID_KABI_RESERVE(1);
398 };
399 
400 /**
401  * struct coresight_ops_helper - Operations for a helper device.
402  *
403  * All operations could pass in a device specific data, which could
404  * help the helper device to determine what to do.
405  *
406  * @enable	: Enable the device
407  * @disable	: Disable the device
408  */
409 struct coresight_ops_helper {
410 	int (*enable)(struct coresight_device *csdev, enum cs_mode mode,
411 		      void *data);
412 	int (*disable)(struct coresight_device *csdev, void *data);
413 };
414 
415 struct coresight_ops {
416 	const struct coresight_ops_sink *sink_ops;
417 	const struct coresight_ops_link *link_ops;
418 	const struct coresight_ops_source *source_ops;
419 	const struct coresight_ops_helper *helper_ops;
420 
421 	ANDROID_KABI_RESERVE(1);
422 };
423 
csdev_access_relaxed_read32(struct csdev_access * csa,u32 offset)424 static inline u32 csdev_access_relaxed_read32(struct csdev_access *csa,
425 					      u32 offset)
426 {
427 	if (likely(csa->io_mem))
428 		return readl_relaxed(csa->base + offset);
429 
430 	return csa->read(offset, true, false);
431 }
432 
433 #define CORESIGHT_CIDRn(i)	(0xFF0 + ((i) * 4))
434 
coresight_get_cid(void __iomem * base)435 static inline u32 coresight_get_cid(void __iomem *base)
436 {
437 	u32 i, cid = 0;
438 
439 	for (i = 0; i < 4; i++)
440 		cid |= readl(base + CORESIGHT_CIDRn(i)) << (i * 8);
441 
442 	return cid;
443 }
444 
is_coresight_device(void __iomem * base)445 static inline bool is_coresight_device(void __iomem *base)
446 {
447 	u32 cid = coresight_get_cid(base);
448 
449 	return cid == CORESIGHT_CID;
450 }
451 
452 /*
453  * Attempt to find and enable "APB clock" for the given device
454  *
455  * Returns:
456  *
457  * clk   - Clock is found and enabled
458  * NULL  - clock is not found
459  * ERROR - Clock is found but failed to enable
460  */
coresight_get_enable_apb_pclk(struct device * dev)461 static inline struct clk *coresight_get_enable_apb_pclk(struct device *dev)
462 {
463 	struct clk *pclk;
464 	int ret;
465 
466 	pclk = clk_get(dev, "apb_pclk");
467 	if (IS_ERR(pclk))
468 		return NULL;
469 
470 	ret = clk_prepare_enable(pclk);
471 	if (ret) {
472 		clk_put(pclk);
473 		return ERR_PTR(ret);
474 	}
475 	return pclk;
476 }
477 
478 #define CORESIGHT_PIDRn(i)	(0xFE0 + ((i) * 4))
479 
coresight_get_pid(struct csdev_access * csa)480 static inline u32 coresight_get_pid(struct csdev_access *csa)
481 {
482 	u32 i, pid = 0;
483 
484 	for (i = 0; i < 4; i++)
485 		pid |= csdev_access_relaxed_read32(csa, CORESIGHT_PIDRn(i)) << (i * 8);
486 
487 	return pid;
488 }
489 
csdev_access_relaxed_read_pair(struct csdev_access * csa,u32 lo_offset,u32 hi_offset)490 static inline u64 csdev_access_relaxed_read_pair(struct csdev_access *csa,
491 						 u32 lo_offset, u32 hi_offset)
492 {
493 	if (likely(csa->io_mem)) {
494 		return readl_relaxed(csa->base + lo_offset) |
495 			((u64)readl_relaxed(csa->base + hi_offset) << 32);
496 	}
497 
498 	return csa->read(lo_offset, true, false) | (csa->read(hi_offset, true, false) << 32);
499 }
500 
csdev_access_relaxed_write_pair(struct csdev_access * csa,u64 val,u32 lo_offset,u32 hi_offset)501 static inline void csdev_access_relaxed_write_pair(struct csdev_access *csa, u64 val,
502 						   u32 lo_offset, u32 hi_offset)
503 {
504 	if (likely(csa->io_mem)) {
505 		writel_relaxed((u32)val, csa->base + lo_offset);
506 		writel_relaxed((u32)(val >> 32), csa->base + hi_offset);
507 	} else {
508 		csa->write((u32)val, lo_offset, true, false);
509 		csa->write((u32)(val >> 32), hi_offset, true, false);
510 	}
511 }
512 
csdev_access_read32(struct csdev_access * csa,u32 offset)513 static inline u32 csdev_access_read32(struct csdev_access *csa, u32 offset)
514 {
515 	if (likely(csa->io_mem))
516 		return readl(csa->base + offset);
517 
518 	return csa->read(offset, false, false);
519 }
520 
csdev_access_relaxed_write32(struct csdev_access * csa,u32 val,u32 offset)521 static inline void csdev_access_relaxed_write32(struct csdev_access *csa,
522 						u32 val, u32 offset)
523 {
524 	if (likely(csa->io_mem))
525 		writel_relaxed(val, csa->base + offset);
526 	else
527 		csa->write(val, offset, true, false);
528 }
529 
csdev_access_write32(struct csdev_access * csa,u32 val,u32 offset)530 static inline void csdev_access_write32(struct csdev_access *csa, u32 val, u32 offset)
531 {
532 	if (likely(csa->io_mem))
533 		writel(val, csa->base + offset);
534 	else
535 		csa->write(val, offset, false, false);
536 }
537 
538 #ifdef CONFIG_64BIT
539 
csdev_access_relaxed_read64(struct csdev_access * csa,u32 offset)540 static inline u64 csdev_access_relaxed_read64(struct csdev_access *csa,
541 					      u32 offset)
542 {
543 	if (likely(csa->io_mem))
544 		return readq_relaxed(csa->base + offset);
545 
546 	return csa->read(offset, true, true);
547 }
548 
csdev_access_read64(struct csdev_access * csa,u32 offset)549 static inline u64 csdev_access_read64(struct csdev_access *csa, u32 offset)
550 {
551 	if (likely(csa->io_mem))
552 		return readq(csa->base + offset);
553 
554 	return csa->read(offset, false, true);
555 }
556 
csdev_access_relaxed_write64(struct csdev_access * csa,u64 val,u32 offset)557 static inline void csdev_access_relaxed_write64(struct csdev_access *csa,
558 						u64 val, u32 offset)
559 {
560 	if (likely(csa->io_mem))
561 		writeq_relaxed(val, csa->base + offset);
562 	else
563 		csa->write(val, offset, true, true);
564 }
565 
csdev_access_write64(struct csdev_access * csa,u64 val,u32 offset)566 static inline void csdev_access_write64(struct csdev_access *csa, u64 val, u32 offset)
567 {
568 	if (likely(csa->io_mem))
569 		writeq(val, csa->base + offset);
570 	else
571 		csa->write(val, offset, false, true);
572 }
573 
574 #else	/* !CONFIG_64BIT */
575 
csdev_access_relaxed_read64(struct csdev_access * csa,u32 offset)576 static inline u64 csdev_access_relaxed_read64(struct csdev_access *csa,
577 					      u32 offset)
578 {
579 	WARN_ON(1);
580 	return 0;
581 }
582 
csdev_access_read64(struct csdev_access * csa,u32 offset)583 static inline u64 csdev_access_read64(struct csdev_access *csa, u32 offset)
584 {
585 	WARN_ON(1);
586 	return 0;
587 }
588 
csdev_access_relaxed_write64(struct csdev_access * csa,u64 val,u32 offset)589 static inline void csdev_access_relaxed_write64(struct csdev_access *csa,
590 						u64 val, u32 offset)
591 {
592 	WARN_ON(1);
593 }
594 
csdev_access_write64(struct csdev_access * csa,u64 val,u32 offset)595 static inline void csdev_access_write64(struct csdev_access *csa, u64 val, u32 offset)
596 {
597 	WARN_ON(1);
598 }
599 #endif	/* CONFIG_64BIT */
600 
coresight_is_percpu_source(struct coresight_device * csdev)601 static inline bool coresight_is_percpu_source(struct coresight_device *csdev)
602 {
603 	return csdev && (csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
604 	       (csdev->subtype.source_subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_PROC);
605 }
606 
coresight_is_percpu_sink(struct coresight_device * csdev)607 static inline bool coresight_is_percpu_sink(struct coresight_device *csdev)
608 {
609 	return csdev && (csdev->type == CORESIGHT_DEV_TYPE_SINK) &&
610 	       (csdev->subtype.sink_subtype == CORESIGHT_DEV_SUBTYPE_SINK_PERCPU_SYSMEM);
611 }
612 
613 /*
614  * Atomically try to take the device and set a new mode. Returns true on
615  * success, false if the device is already taken by someone else.
616  */
coresight_take_mode(struct coresight_device * csdev,enum cs_mode new_mode)617 static inline bool coresight_take_mode(struct coresight_device *csdev,
618 				       enum cs_mode new_mode)
619 {
620 	return local_cmpxchg(&csdev->mode, CS_MODE_DISABLED, new_mode) ==
621 	       CS_MODE_DISABLED;
622 }
623 
coresight_get_mode(struct coresight_device * csdev)624 static inline enum cs_mode coresight_get_mode(struct coresight_device *csdev)
625 {
626 	return local_read(&csdev->mode);
627 }
628 
coresight_set_mode(struct coresight_device * csdev,enum cs_mode new_mode)629 static inline void coresight_set_mode(struct coresight_device *csdev,
630 				      enum cs_mode new_mode)
631 {
632 	enum cs_mode current_mode = coresight_get_mode(csdev);
633 
634 	/*
635 	 * Changing to a new mode must be done from an already disabled state
636 	 * unless it's synchronized with coresight_take_mode(). Otherwise the
637 	 * device is already in use and signifies a locking issue.
638 	 */
639 	WARN(new_mode != CS_MODE_DISABLED && current_mode != CS_MODE_DISABLED &&
640 	     current_mode != new_mode, "Device already in use\n");
641 
642 	local_set(&csdev->mode, new_mode);
643 }
644 
645 extern struct coresight_device *
646 coresight_register(struct coresight_desc *desc);
647 extern void coresight_unregister(struct coresight_device *csdev);
648 extern int coresight_enable_sysfs(struct coresight_device *csdev);
649 extern void coresight_disable_sysfs(struct coresight_device *csdev);
650 extern int coresight_timeout(struct csdev_access *csa, u32 offset,
651 			     int position, int value);
652 typedef void (*coresight_timeout_cb_t) (struct csdev_access *, u32, int, int);
653 extern int coresight_timeout_action(struct csdev_access *csa, u32 offset,
654 					int position, int value,
655 					coresight_timeout_cb_t cb);
656 
657 extern int coresight_claim_device(struct coresight_device *csdev);
658 extern int coresight_claim_device_unlocked(struct coresight_device *csdev);
659 
660 extern void coresight_disclaim_device(struct coresight_device *csdev);
661 extern void coresight_disclaim_device_unlocked(struct coresight_device *csdev);
662 extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
663 					 struct device *dev);
664 
665 extern bool coresight_loses_context_with_cpu(struct device *dev);
666 
667 u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset);
668 u32 coresight_read32(struct coresight_device *csdev, u32 offset);
669 void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset);
670 void coresight_relaxed_write32(struct coresight_device *csdev,
671 			       u32 val, u32 offset);
672 u64 coresight_relaxed_read64(struct coresight_device *csdev, u32 offset);
673 u64 coresight_read64(struct coresight_device *csdev, u32 offset);
674 void coresight_relaxed_write64(struct coresight_device *csdev,
675 			       u64 val, u32 offset);
676 void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset);
677 
678 extern int coresight_get_cpu(struct device *dev);
679 
680 struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
681 struct coresight_connection *
682 coresight_add_out_conn(struct device *dev,
683 		       struct coresight_platform_data *pdata,
684 		       const struct coresight_connection *new_conn);
685 int coresight_add_in_conn(struct coresight_connection *conn);
686 struct coresight_device *
687 coresight_find_input_type(struct coresight_platform_data *pdata,
688 			  enum coresight_dev_type type,
689 			  union coresight_dev_subtype subtype);
690 struct coresight_device *
691 coresight_find_output_type(struct coresight_platform_data *pdata,
692 			   enum coresight_dev_type type,
693 			   union coresight_dev_subtype subtype);
694 
695 int coresight_init_driver(const char *drv, struct amba_driver *amba_drv,
696 			  struct platform_driver *pdev_drv, struct module *owner);
697 
698 void coresight_remove_driver(struct amba_driver *amba_drv,
699 			     struct platform_driver *pdev_drv);
700 #endif		/* _LINUX_COREISGHT_H */
701