drivers/hwtracing/intel_th/intel_th.h

   1 /*
   2  * Intel(R) Trace Hub data structures
   3  *
   4  * Copyright (C) 2014-2015 Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #ifndef __INTEL_TH_H__
  17 #define __INTEL_TH_H__
  18
  19 /* intel_th_device device types */
  20 enum {
  21         /* Devices that generate trace data */
  22         INTEL_TH_SOURCE = 0,
  23         /* Output ports (MSC, PTI) */
  24         INTEL_TH_OUTPUT,
  25         /* Switch, the Global Trace Hub (GTH) */
  26         INTEL_TH_SWITCH,
  27 };
  28
  29 /**
  30  * struct intel_th_output - descriptor INTEL_TH_OUTPUT type devices
  31  * @port:       output port number, assigned by the switch
  32  * @type:       GTH_{MSU,CTP,PTI}
  33  * @scratchpad: scratchpad bits to flag when this output is enabled
  34  * @multiblock: true for multiblock output configuration
  35  * @active:     true when this output is enabled
  36  *
  37  * Output port descriptor, used by switch driver to tell which output
  38  * port this output device corresponds to. Filled in at output device's
  39  * probe time by switch::assign(). Passed from output device driver to
  40  * switch related code to enable/disable its port.
  41  */
  42 struct intel_th_output {
  43         int             port;
  44         unsigned int    type;
  45         unsigned int    scratchpad;
  46         bool            multiblock;
  47         bool            active;
  48 };
  49
  50 /**
  51  * struct intel_th_device - device on the intel_th bus
  52  * @dev:                device
  53  * @resource:           array of resources available to this device
  54  * @num_resources:      number of resources in @resource array
  55  * @type:               INTEL_TH_{SOURCE,OUTPUT,SWITCH}
  56  * @id:                 device instance or -1
  57  * @output:             output descriptor for INTEL_TH_OUTPUT devices
  58  * @name:               device name to match the driver
  59  */
  60 struct intel_th_device {
  61         struct device   dev;
  62         struct resource *resource;
  63         unsigned int    num_resources;
  64         unsigned int    type;
  65         int             id;
  66
  67         /* INTEL_TH_OUTPUT specific */
  68         struct intel_th_output  output;
  69
  70         char            name[];
  71 };
  72
  73 #define to_intel_th_device(_d)                          \
  74         container_of((_d), struct intel_th_device, dev)
  75
  76 /**
  77  * intel_th_device_get_resource() - obtain @num'th resource of type @type
  78  * @thdev:      the device to search the resource for
  79  * @type:       resource type
  80  * @num:        number of the resource
  81  */
  82 static inline struct resource *
  83 intel_th_device_get_resource(struct intel_th_device *thdev, unsigned int type,
  84                              unsigned int num)
  85 {
  86         int i;
  87
  88         for (i = 0; i < thdev->num_resources; i++)
  89                 if (resource_type(&thdev->resource[i]) == type && !num--)
  90                         return &thdev->resource[i];
  91
  92         return NULL;
  93 }
  94
  95 /**
  96  * intel_th_output_assigned() - if an output device is assigned to a switch port
  97  * @thdev:      the output device
  98  *
  99  * Return:      true if the device is INTEL_TH_OUTPUT *and* is assigned a port
 100  */
 101 static inline bool
 102 intel_th_output_assigned(struct intel_th_device *thdev)
 103 {
 104         return thdev->type == INTEL_TH_OUTPUT &&
 105                 thdev->output.port >= 0;
 106 }
 107
 108 /**
 109  * struct intel_th_driver - driver for an intel_th_device device
 110  * @driver:     generic driver
 111  * @probe:      probe method
 112  * @remove:     remove method
 113  * @assign:     match a given output type device against available outputs
 114  * @unassign:   deassociate an output type device from an output port
 115  * @enable:     enable tracing for a given output device
 116  * @disable:    disable tracing for a given output device
 117  * @irq:        interrupt callback
 118  * @activate:   enable tracing on the output's side
 119  * @deactivate: disable tracing on the output's side
 120  * @fops:       file operations for device nodes
 121  * @attr_group: attributes provided by the driver
 122  *
 123  * Callbacks @probe and @remove are required for all device types.
 124  * Switch device driver needs to fill in @assign, @enable and @disable
 125  * callbacks.
 126  */
 127 struct intel_th_driver {
 128         struct device_driver    driver;
 129         int                     (*probe)(struct intel_th_device *thdev);
 130         void                    (*remove)(struct intel_th_device *thdev);
 131         /* switch (GTH) ops */
 132         int                     (*assign)(struct intel_th_device *thdev,
 133                                           struct intel_th_device *othdev);
 134         void                    (*unassign)(struct intel_th_device *thdev,
 135                                             struct intel_th_device *othdev);
 136         void                    (*enable)(struct intel_th_device *thdev,
 137                                           struct intel_th_output *output);
 138         void                    (*disable)(struct intel_th_device *thdev,
 139                                            struct intel_th_output *output);
 140         /* output ops */
 141         void                    (*irq)(struct intel_th_device *thdev);
 142         int                     (*activate)(struct intel_th_device *thdev);
 143         void                    (*deactivate)(struct intel_th_device *thdev);
 144         /* file_operations for those who want a device node */
 145         const struct file_operations *fops;
 146         /* optional attributes */
 147         struct attribute_group  *attr_group;
 148
 149         /* source ops */
 150         int                     (*set_output)(struct intel_th_device *thdev,
 151                                               unsigned int master);
 152 };
 153
 154 #define to_intel_th_driver(_d)                                  \
 155         container_of((_d), struct intel_th_driver, driver)
 156
 157 #define to_intel_th_driver_or_null(_d)          \
 158         ((_d) ? to_intel_th_driver(_d) : NULL)
 159
 160 static inline struct intel_th_device *
 161 to_intel_th_hub(struct intel_th_device *thdev)
 162 {
 163         struct device *parent = thdev->dev.parent;
 164
 165         if (!parent)
 166                 return NULL;
 167
 168         return to_intel_th_device(parent);
 169 }
 170
 171 struct intel_th *
 172 intel_th_alloc(struct device *dev, struct resource *devres,
 173                unsigned int ndevres, int irq);
 174 void intel_th_free(struct intel_th *th);
 175
 176 int intel_th_driver_register(struct intel_th_driver *thdrv);
 177 void intel_th_driver_unregister(struct intel_th_driver *thdrv);
 178
 179 int intel_th_trace_enable(struct intel_th_device *thdev);
 180 int intel_th_trace_disable(struct intel_th_device *thdev);
 181 int intel_th_set_output(struct intel_th_device *thdev,
 182                         unsigned int master);
 183
 184 enum {
 185         TH_MMIO_CONFIG = 0,
 186         TH_MMIO_SW = 2,
 187         TH_MMIO_END,
 188 };
 189
 190 #define TH_SUBDEVICE_MAX        6
 191 #define TH_POSSIBLE_OUTPUTS     8
 192 #define TH_CONFIGURABLE_MASTERS 256
 193 #define TH_MSC_MAX              2
 194
 195 /**
 196  * struct intel_th - Intel TH controller
 197  * @dev:        driver core's device
 198  * @thdev:      subdevices
 199  * @hub:        "switch" subdevice (GTH)
 200  * @id:         this Intel TH controller's device ID in the system
 201  * @major:      device node major for output devices
 202  */
 203 struct intel_th {
 204         struct device           *dev;
 205
 206         struct intel_th_device  *thdev[TH_SUBDEVICE_MAX];
 207         struct intel_th_device  *hub;
 208
 209         int                     id;
 210         int                     major;
 211 #ifdef CONFIG_MODULES
 212         struct work_struct      request_module_work;
 213 #endif /* CONFIG_MODULES */
 214 #ifdef CONFIG_INTEL_TH_DEBUG
 215         struct dentry           *dbg;
 216 #endif
 217 };
 218
 219 /*
 220  * Register windows
 221  */
 222 enum {
 223         /* Global Trace Hub (GTH) */
 224         REG_GTH_OFFSET          = 0x0000,
 225         REG_GTH_LENGTH          = 0x2000,
 226
 227         /* Software Trace Hub (STH) [0x4000..0x4fff] */
 228         REG_STH_OFFSET          = 0x4000,
 229         REG_STH_LENGTH          = 0x2000,
 230
 231         /* Memory Storage Unit (MSU) [0xa0000..0xa1fff] */
 232         REG_MSU_OFFSET          = 0xa0000,
 233         REG_MSU_LENGTH          = 0x02000,
 234
 235         /* Internal MSU trace buffer [0x80000..0x9ffff] */
 236         BUF_MSU_OFFSET          = 0x80000,
 237         BUF_MSU_LENGTH          = 0x20000,
 238
 239         /* PTI output == same window as GTH */
 240         REG_PTI_OFFSET          = REG_GTH_OFFSET,
 241         REG_PTI_LENGTH          = REG_GTH_LENGTH,
 242
 243         /* DCI Handler (DCIH) == some window as MSU */
 244         REG_DCIH_OFFSET         = REG_MSU_OFFSET,
 245         REG_DCIH_LENGTH         = REG_MSU_LENGTH,
 246 };
 247
 248 /*
 249  * GTH, output ports configuration
 250  */
 251 enum {
 252         GTH_NONE = 0,
 253         GTH_MSU,        /* memory/usb */
 254         GTH_CTP,        /* Common Trace Port */
 255         GTH_PTI = 4,    /* MIPI-PTI */
 256 };
 257
 258 /*
 259  * Scratchpad bits: tell firmware and external debuggers
 260  * what we are up to.
 261  */
 262 enum {
 263         /* Memory is the primary destination */
 264         SCRPD_MEM_IS_PRIM_DEST          = BIT(0),
 265         /* XHCI DbC is the primary destination */
 266         SCRPD_DBC_IS_PRIM_DEST          = BIT(1),
 267         /* PTI is the primary destination */
 268         SCRPD_PTI_IS_PRIM_DEST          = BIT(2),
 269         /* BSSB is the primary destination */
 270         SCRPD_BSSB_IS_PRIM_DEST         = BIT(3),
 271         /* PTI is the alternate destination */
 272         SCRPD_PTI_IS_ALT_DEST           = BIT(4),
 273         /* BSSB is the alternate destination */
 274         SCRPD_BSSB_IS_ALT_DEST          = BIT(5),
 275         /* DeepSx exit occurred */
 276         SCRPD_DEEPSX_EXIT               = BIT(6),
 277         /* S4 exit occurred */
 278         SCRPD_S4_EXIT                   = BIT(7),
 279         /* S5 exit occurred */
 280         SCRPD_S5_EXIT                   = BIT(8),
 281         /* MSU controller 0/1 is enabled */
 282         SCRPD_MSC0_IS_ENABLED           = BIT(9),
 283         SCRPD_MSC1_IS_ENABLED           = BIT(10),
 284         /* Sx exit occurred */
 285         SCRPD_SX_EXIT                   = BIT(11),
 286         /* Trigger Unit is enabled */
 287         SCRPD_TRIGGER_IS_ENABLED        = BIT(12),
 288         SCRPD_ODLA_IS_ENABLED           = BIT(13),
 289         SCRPD_SOCHAP_IS_ENABLED         = BIT(14),
 290         SCRPD_STH_IS_ENABLED            = BIT(15),
 291         SCRPD_DCIH_IS_ENABLED           = BIT(16),
 292         SCRPD_VER_IS_ENABLED            = BIT(17),
 293         /* External debugger is using Intel TH */
 294         SCRPD_DEBUGGER_IN_USE           = BIT(24),
 295 };
 296
 297 #endif