include/linux/coresight.h

   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/device.h>
  10 #include <linux/perf_event.h>
  11 #include <linux/sched.h>
  12
  13 /* Peripheral id registers (0xFD0-0xFEC) */
  14 #define CORESIGHT_PERIPHIDR4    0xfd0
  15 #define CORESIGHT_PERIPHIDR5    0xfd4
  16 #define CORESIGHT_PERIPHIDR6    0xfd8
  17 #define CORESIGHT_PERIPHIDR7    0xfdC
  18 #define CORESIGHT_PERIPHIDR0    0xfe0
  19 #define CORESIGHT_PERIPHIDR1    0xfe4
  20 #define CORESIGHT_PERIPHIDR2    0xfe8
  21 #define CORESIGHT_PERIPHIDR3    0xfeC
  22 /* Component id registers (0xFF0-0xFFC) */
  23 #define CORESIGHT_COMPIDR0      0xff0
  24 #define CORESIGHT_COMPIDR1      0xff4
  25 #define CORESIGHT_COMPIDR2      0xff8
  26 #define CORESIGHT_COMPIDR3      0xffC
  27
  28 #define ETM_ARCH_V3_3           0x23
  29 #define ETM_ARCH_V3_5           0x25
  30 #define PFT_ARCH_V1_0           0x30
  31 #define PFT_ARCH_V1_1           0x31
  32
  33 #define CORESIGHT_UNLOCK        0xc5acce55
  34
  35 extern struct bus_type coresight_bustype;
  36
  37 enum coresight_dev_type {
  38         CORESIGHT_DEV_TYPE_NONE,
  39         CORESIGHT_DEV_TYPE_SINK,
  40         CORESIGHT_DEV_TYPE_LINK,
  41         CORESIGHT_DEV_TYPE_LINKSINK,
  42         CORESIGHT_DEV_TYPE_SOURCE,
  43         CORESIGHT_DEV_TYPE_HELPER,
  44 };
  45
  46 enum coresight_dev_subtype_sink {
  47         CORESIGHT_DEV_SUBTYPE_SINK_NONE,
  48         CORESIGHT_DEV_SUBTYPE_SINK_PORT,
  49         CORESIGHT_DEV_SUBTYPE_SINK_BUFFER,
  50 };
  51
  52 enum coresight_dev_subtype_link {
  53         CORESIGHT_DEV_SUBTYPE_LINK_NONE,
  54         CORESIGHT_DEV_SUBTYPE_LINK_MERG,
  55         CORESIGHT_DEV_SUBTYPE_LINK_SPLIT,
  56         CORESIGHT_DEV_SUBTYPE_LINK_FIFO,
  57 };
  58
  59 enum coresight_dev_subtype_source {
  60         CORESIGHT_DEV_SUBTYPE_SOURCE_NONE,
  61         CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
  62         CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
  63         CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
  64 };
  65
  66 enum coresight_dev_subtype_helper {
  67         CORESIGHT_DEV_SUBTYPE_HELPER_NONE,
  68         CORESIGHT_DEV_SUBTYPE_HELPER_CATU,
  69 };
  70
  71 /**
  72  * union coresight_dev_subtype - further characterisation of a type
  73  * @sink_subtype:       type of sink this component is, as defined
  74  *                      by @coresight_dev_subtype_sink.
  75  * @link_subtype:       type of link this component is, as defined
  76  *                      by @coresight_dev_subtype_link.
  77  * @source_subtype:     type of source this component is, as defined
  78  *                      by @coresight_dev_subtype_source.
  79  * @helper_subtype:     type of helper this component is, as defined
  80  *                      by @coresight_dev_subtype_helper.
  81  */
  82 union coresight_dev_subtype {
  83         /* We have some devices which acts as LINK and SINK */
  84         struct {
  85                 enum coresight_dev_subtype_sink sink_subtype;
  86                 enum coresight_dev_subtype_link link_subtype;
  87         };
  88         enum coresight_dev_subtype_source source_subtype;
  89         enum coresight_dev_subtype_helper helper_subtype;
  90 };
  91
  92 /**
  93  * struct coresight_platform_data - data harvested from the DT specification
  94  * @nr_inport:  number of input ports for this component.
  95  * @nr_outport: number of output ports for this component.
  96  * @conns:      Array of nr_outport connections from this component
  97  */
  98 struct coresight_platform_data {
  99         int nr_inport;
 100         int nr_outport;
 101         struct coresight_connection *conns;
 102 };
 103
 104 /**
 105  * struct coresight_desc - description of a component required from drivers
 106  * @type:       as defined by @coresight_dev_type.
 107  * @subtype:    as defined by @coresight_dev_subtype.
 108  * @ops:        generic operations for this component, as defined
 109  *              by @coresight_ops.
 110  * @pdata:      platform data collected from DT.
 111  * @dev:        The device entity associated to this component.
 112  * @groups:     operations specific to this component. These will end up
 113  *              in the component's sysfs sub-directory.
 114  * @name:       name for the coresight device, also shown under sysfs.
 115  */
 116 struct coresight_desc {
 117         enum coresight_dev_type type;
 118         union coresight_dev_subtype subtype;
 119         const struct coresight_ops *ops;
 120         struct coresight_platform_data *pdata;
 121         struct device *dev;
 122         const struct attribute_group **groups;
 123         const char *name;
 124 };
 125
 126 /**
 127  * struct coresight_connection - representation of a single connection
 128  * @outport:    a connection's output port number.
 129  * @child_port: remote component's port number @output is connected to.
 130  * @chid_fwnode: remote component's fwnode handle.
 131  * @child_dev:  a @coresight_device representation of the component
 132                 connected to @outport.
 133  */
 134 struct coresight_connection {
 135         int outport;
 136         int child_port;
 137         struct fwnode_handle *child_fwnode;
 138         struct coresight_device *child_dev;
 139 };
 140
 141 /**
 142  * struct coresight_device - representation of a device as used by the framework
 143  * @pdata:      Platform data with device connections associated to this device.
 144  * @type:       as defined by @coresight_dev_type.
 145  * @subtype:    as defined by @coresight_dev_subtype.
 146  * @ops:        generic operations for this component, as defined
 147                 by @coresight_ops.
 148  * @dev:        The device entity associated to this component.
 149  * @refcnt:     keep track of what is in use.
 150  * @orphan:     true if the component has connections that haven't been linked.
 151  * @enable:     'true' if component is currently part of an active path.
 152  * @activated:  'true' only if a _sink_ has been activated.  A sink can be
 153  *              activated but not yet enabled.  Enabling for a _sink_
 154  *              appens when a source has been selected for that it.
 155  * @ea:         Device attribute for sink representation under PMU directory.
 156  */
 157 struct coresight_device {
 158         struct coresight_platform_data *pdata;
 159         enum coresight_dev_type type;
 160         union coresight_dev_subtype subtype;
 161         const struct coresight_ops *ops;
 162         struct device dev;
 163         atomic_t *refcnt;
 164         bool orphan;
 165         bool enable;    /* true only if configured as part of a path */
 166         /* sink specific fields */
 167         bool activated; /* true only if a sink is part of a path */
 168         struct dev_ext_attribute *ea;
 169 };
 170
 171 /*
 172  * coresight_dev_list - Mapping for devices to "name" index for device
 173  * names.
 174  *
 175  * @nr_idx:             Number of entries already allocated.
 176  * @pfx:                Prefix pattern for device name.
 177  * @fwnode_list:        Array of fwnode_handles associated with each allocated
 178  *                      index, upto nr_idx entries.
 179  */
 180 struct coresight_dev_list {
 181         int                     nr_idx;
 182         const char              *pfx;
 183         struct fwnode_handle    **fwnode_list;
 184 };
 185
 186 #define DEFINE_CORESIGHT_DEVLIST(var, dev_pfx)                          \
 187 static struct coresight_dev_list (var) = {                              \
 188                                                 .pfx = dev_pfx,         \
 189                                                 .nr_idx = 0,            \
 190                                                 .fwnode_list = NULL,    \
 191 }
 192
 193 #define to_coresight_device(d) container_of(d, struct coresight_device, dev)
 194
 195 #define source_ops(csdev)       csdev->ops->source_ops
 196 #define sink_ops(csdev)         csdev->ops->sink_ops
 197 #define link_ops(csdev)         csdev->ops->link_ops
 198 #define helper_ops(csdev)       csdev->ops->helper_ops
 199
 200 /**
 201  * struct coresight_ops_sink - basic operations for a sink
 202  * Operations available for sinks
 203  * @enable:             enables the sink.
 204  * @disable:            disables the sink.
 205  * @alloc_buffer:       initialises perf's ring buffer for trace collection.
 206  * @free_buffer:        release memory allocated in @get_config.
 207  * @update_buffer:      update buffer pointers after a trace session.
 208  */
 209 struct coresight_ops_sink {
 210         int (*enable)(struct coresight_device *csdev, u32 mode, void *data);
 211         int (*disable)(struct coresight_device *csdev);
 212         void *(*alloc_buffer)(struct coresight_device *csdev,
 213                               struct perf_event *event, void **pages,
 214                               int nr_pages, bool overwrite);
 215         void (*free_buffer)(void *config);
 216         unsigned long (*update_buffer)(struct coresight_device *csdev,
 217                               struct perf_output_handle *handle,
 218                               void *sink_config);
 219 };
 220
 221 /**
 222  * struct coresight_ops_link - basic operations for a link
 223  * Operations available for links.
 224  * @enable:     enables flow between iport and oport.
 225  * @disable:    disables flow between iport and oport.
 226  */
 227 struct coresight_ops_link {
 228         int (*enable)(struct coresight_device *csdev, int iport, int oport);
 229         void (*disable)(struct coresight_device *csdev, int iport, int oport);
 230 };
 231
 232 /**
 233  * struct coresight_ops_source - basic operations for a source
 234  * Operations available for sources.
 235  * @cpu_id:     returns the value of the CPU number this component
 236  *              is associated to.
 237  * @trace_id:   returns the value of the component's trace ID as known
 238  *              to the HW.
 239  * @enable:     enables tracing for a source.
 240  * @disable:    disables tracing for a source.
 241  */
 242 struct coresight_ops_source {
 243         int (*cpu_id)(struct coresight_device *csdev);
 244         int (*trace_id)(struct coresight_device *csdev);
 245         int (*enable)(struct coresight_device *csdev,
 246                       struct perf_event *event,  u32 mode);
 247         void (*disable)(struct coresight_device *csdev,
 248                         struct perf_event *event);
 249 };
 250
 251 /**
 252  * struct coresight_ops_helper - Operations for a helper device.
 253  *
 254  * All operations could pass in a device specific data, which could
 255  * help the helper device to determine what to do.
 256  *
 257  * @enable      : Enable the device
 258  * @disable     : Disable the device
 259  */
 260 struct coresight_ops_helper {
 261         int (*enable)(struct coresight_device *csdev, void *data);
 262         int (*disable)(struct coresight_device *csdev, void *data);
 263 };
 264
 265 struct coresight_ops {
 266         const struct coresight_ops_sink *sink_ops;
 267         const struct coresight_ops_link *link_ops;
 268         const struct coresight_ops_source *source_ops;
 269         const struct coresight_ops_helper *helper_ops;
 270 };
 271
 272 #ifdef CONFIG_CORESIGHT
 273 extern struct coresight_device *
 274 coresight_register(struct coresight_desc *desc);
 275 extern void coresight_unregister(struct coresight_device *csdev);
 276 extern int coresight_enable(struct coresight_device *csdev);
 277 extern void coresight_disable(struct coresight_device *csdev);
 278 extern int coresight_timeout(void __iomem *addr, u32 offset,
 279                              int position, int value);
 280
 281 extern int coresight_claim_device(void __iomem *base);
 282 extern int coresight_claim_device_unlocked(void __iomem *base);
 283
 284 extern void coresight_disclaim_device(void __iomem *base);
 285 extern void coresight_disclaim_device_unlocked(void __iomem *base);
 286 extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
 287                                          struct device *dev);
 288 #else
 289 static inline struct coresight_device *
 290 coresight_register(struct coresight_desc *desc) { return NULL; }
 291 static inline void coresight_unregister(struct coresight_device *csdev) {}
 292 static inline int
 293 coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
 294 static inline void coresight_disable(struct coresight_device *csdev) {}
 295 static inline int coresight_timeout(void __iomem *addr, u32 offset,
 296                                      int position, int value) { return 1; }
 297 static inline int coresight_claim_device_unlocked(void __iomem *base)
 298 {
 299         return -EINVAL;
 300 }
 301
 302 static inline int coresight_claim_device(void __iomem *base)
 303 {
 304         return -EINVAL;
 305 }
 306
 307 static inline void coresight_disclaim_device(void __iomem *base) {}
 308 static inline void coresight_disclaim_device_unlocked(void __iomem *base) {}
 309
 310 #endif
 311
 312 extern int coresight_get_cpu(struct device *dev);
 313
 314 struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
 315
 316 #endif