include/linux/coresight.h

   1 /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12
  13 #ifndef _LINUX_CORESIGHT_H
  14 #define _LINUX_CORESIGHT_H
  15
  16 #include <linux/device.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 struct bus_type coresight_bustype;
  41
  42 enum coresight_dev_type {
  43         CORESIGHT_DEV_TYPE_NONE,
  44         CORESIGHT_DEV_TYPE_SINK,
  45         CORESIGHT_DEV_TYPE_LINK,
  46         CORESIGHT_DEV_TYPE_LINKSINK,
  47         CORESIGHT_DEV_TYPE_SOURCE,
  48 };
  49
  50 enum coresight_dev_subtype_sink {
  51         CORESIGHT_DEV_SUBTYPE_SINK_NONE,
  52         CORESIGHT_DEV_SUBTYPE_SINK_PORT,
  53         CORESIGHT_DEV_SUBTYPE_SINK_BUFFER,
  54 };
  55
  56 enum coresight_dev_subtype_link {
  57         CORESIGHT_DEV_SUBTYPE_LINK_NONE,
  58         CORESIGHT_DEV_SUBTYPE_LINK_MERG,
  59         CORESIGHT_DEV_SUBTYPE_LINK_SPLIT,
  60         CORESIGHT_DEV_SUBTYPE_LINK_FIFO,
  61 };
  62
  63 enum coresight_dev_subtype_source {
  64         CORESIGHT_DEV_SUBTYPE_SOURCE_NONE,
  65         CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
  66         CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
  67         CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
  68 };
  69
  70 /**
  71  * struct coresight_dev_subtype - further characterisation of a type
  72  * @sink_subtype:       type of sink this component is, as defined
  73                         by @coresight_dev_subtype_sink.
  74  * @link_subtype:       type of link this component is, as defined
  75                         by @coresight_dev_subtype_link.
  76  * @source_subtype:     type of source this component is, as defined
  77                         by @coresight_dev_subtype_source.
  78  */
  79 struct coresight_dev_subtype {
  80         enum coresight_dev_subtype_sink sink_subtype;
  81         enum coresight_dev_subtype_link link_subtype;
  82         enum coresight_dev_subtype_source source_subtype;
  83 };
  84
  85 /**
  86  * struct coresight_platform_data - data harvested from the DT specification
  87  * @cpu:        the CPU a source belongs to. Only applicable for ETM/PTMs.
  88  * @name:       name of the component as shown under sysfs.
  89  * @nr_inport:  number of input ports for this component.
  90  * @outports:   list of remote endpoint port number.
  91  * @child_names:name of all child components connected to this device.
  92  * @child_ports:child component port number the current component is
  93                 connected  to.
  94  * @nr_outport: number of output ports for this component.
  95  * @clk:        The clock this component is associated to.
  96  */
  97 struct coresight_platform_data {
  98         int cpu;
  99         const char *name;
 100         int nr_inport;
 101         int *outports;
 102         const char **child_names;
 103         int *child_ports;
 104         int nr_outport;
 105         struct clk *clk;
 106 };
 107
 108 /**
 109  * struct coresight_desc - description of a component required from drivers
 110  * @type:       as defined by @coresight_dev_type.
 111  * @subtype:    as defined by @coresight_dev_subtype.
 112  * @ops:        generic operations for this component, as defined
 113                 by @coresight_ops.
 114  * @pdata:      platform data collected from DT.
 115  * @dev:        The device entity associated to this component.
 116  * @groups:     operations specific to this component. These will end up
 117                 in the component's sysfs sub-directory.
 118  */
 119 struct coresight_desc {
 120         enum coresight_dev_type type;
 121         struct coresight_dev_subtype subtype;
 122         const struct coresight_ops *ops;
 123         struct coresight_platform_data *pdata;
 124         struct device *dev;
 125         const struct attribute_group **groups;
 126 };
 127
 128 /**
 129  * struct coresight_connection - representation of a single connection
 130  * @outport:    a connection's output port number.
 131  * @chid_name:  remote component's name.
 132  * @child_port: remote component's port number @output is connected to.
 133  * @child_dev:  a @coresight_device representation of the component
 134                 connected to @outport.
 135  */
 136 struct coresight_connection {
 137         int outport;
 138         const char *child_name;
 139         int child_port;
 140         struct coresight_device *child_dev;
 141 };
 142
 143 /**
 144  * struct coresight_device - representation of a device as used by the framework
 145  * @conns:      array of coresight_connections associated to this component.
 146  * @nr_inport:  number of input port associated to this component.
 147  * @nr_outport: number of output port associated to this component.
 148  * @type:       as defined by @coresight_dev_type.
 149  * @subtype:    as defined by @coresight_dev_subtype.
 150  * @ops:        generic operations for this component, as defined
 151                 by @coresight_ops.
 152  * @dev:        The device entity associated to this component.
 153  * @refcnt:     keep track of what is in use.
 154  * @path_link:  link of current component into the path being enabled.
 155  * @orphan:     true if the component has connections that haven't been linked.
 156  * @enable:     'true' if component is currently part of an active path.
 157  * @activated:  'true' only if a _sink_ has been activated.  A sink can be
 158                 activated but not yet enabled.  Enabling for a _sink_
 159                 happens when a source has been selected for that it.
 160  */
 161 struct coresight_device {
 162         struct coresight_connection *conns;
 163         int nr_inport;
 164         int nr_outport;
 165         enum coresight_dev_type type;
 166         struct coresight_dev_subtype subtype;
 167         const struct coresight_ops *ops;
 168         struct device dev;
 169         atomic_t *refcnt;
 170         struct list_head path_link;
 171         bool orphan;
 172         bool enable;    /* true only if configured as part of a path */
 173         bool activated; /* true only if a sink is part of a path */
 174 };
 175
 176 #define to_coresight_device(d) container_of(d, struct coresight_device, dev)
 177
 178 #define source_ops(csdev)       csdev->ops->source_ops
 179 #define sink_ops(csdev)         csdev->ops->sink_ops
 180 #define link_ops(csdev)         csdev->ops->link_ops
 181
 182 /**
 183  * struct coresight_ops_sink - basic operations for a sink
 184  * Operations available for sinks
 185  * @enable:     enables the sink.
 186  * @disable:    disables the sink.
 187  */
 188 struct coresight_ops_sink {
 189         int (*enable)(struct coresight_device *csdev);
 190         void (*disable)(struct coresight_device *csdev);
 191 };
 192
 193 /**
 194  * struct coresight_ops_link - basic operations for a link
 195  * Operations available for links.
 196  * @enable:     enables flow between iport and oport.
 197  * @disable:    disables flow between iport and oport.
 198  */
 199 struct coresight_ops_link {
 200         int (*enable)(struct coresight_device *csdev, int iport, int oport);
 201         void (*disable)(struct coresight_device *csdev, int iport, int oport);
 202 };
 203
 204 /**
 205  * struct coresight_ops_source - basic operations for a source
 206  * Operations available for sources.
 207  * @trace_id:   returns the value of the component's trace ID as known
 208                 to the HW.
 209  * @enable:     enables tracing from a source.
 210  * @disable:    disables tracing for a source.
 211  */
 212 struct coresight_ops_source {
 213         int (*trace_id)(struct coresight_device *csdev);
 214         int (*enable)(struct coresight_device *csdev);
 215         void (*disable)(struct coresight_device *csdev);
 216 };
 217
 218 struct coresight_ops {
 219         const struct coresight_ops_sink *sink_ops;
 220         const struct coresight_ops_link *link_ops;
 221         const struct coresight_ops_source *source_ops;
 222 };
 223
 224 #ifdef CONFIG_CORESIGHT
 225 extern struct coresight_device *
 226 coresight_register(struct coresight_desc *desc);
 227 extern void coresight_unregister(struct coresight_device *csdev);
 228 extern int coresight_enable(struct coresight_device *csdev);
 229 extern void coresight_disable(struct coresight_device *csdev);
 230 extern int coresight_timeout(void __iomem *addr, u32 offset,
 231                              int position, int value);
 232 #else
 233 static inline struct coresight_device *
 234 coresight_register(struct coresight_desc *desc) { return NULL; }
 235 static inline void coresight_unregister(struct coresight_device *csdev) {}
 236 static inline int
 237 coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
 238 static inline void coresight_disable(struct coresight_device *csdev) {}
 239 static inline int coresight_timeout(void __iomem *addr, u32 offset,
 240                                      int position, int value) { return 1; }
 241 #endif
 242
 243 #ifdef CONFIG_OF
 244 extern struct coresight_platform_data *of_get_coresight_platform_data(
 245                                 struct device *dev, struct device_node *node);
 246 #else
 247 static inline struct coresight_platform_data *of_get_coresight_platform_data(
 248         struct device *dev, struct device_node *node) { return NULL; }
 249 #endif
 250
 251 #endif