drivers/hwtracing/coresight/coresight-priv.h

   1 /* Copyright (c) 2011-2012, 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 _CORESIGHT_PRIV_H
  14 #define _CORESIGHT_PRIV_H
  15
  16 #include <linux/bitops.h>
  17 #include <linux/io.h>
  18 #include <linux/coresight.h>
  19 #include <linux/pm_runtime.h>
  20
  21 /*
  22  * Coresight management registers (0xf00-0xfcc)
  23  * 0xfa0 - 0xfa4: Management    registers in PFTv1.0
  24  *                Trace         registers in PFTv1.1
  25  */
  26 #define CORESIGHT_ITCTRL        0xf00
  27 #define CORESIGHT_CLAIMSET      0xfa0
  28 #define CORESIGHT_CLAIMCLR      0xfa4
  29 #define CORESIGHT_LAR           0xfb0
  30 #define CORESIGHT_LSR           0xfb4
  31 #define CORESIGHT_AUTHSTATUS    0xfb8
  32 #define CORESIGHT_DEVID         0xfc8
  33 #define CORESIGHT_DEVTYPE       0xfcc
  34
  35 #define TIMEOUT_US              100
  36 #define BMVAL(val, lsb, msb)    ((val & GENMASK(msb, lsb)) >> lsb)
  37
  38 #define ETM_MODE_EXCL_KERN      BIT(30)
  39 #define ETM_MODE_EXCL_USER      BIT(31)
  40
  41 typedef u32 (*coresight_read_fn)(const struct device *, u32 offset);
  42 #define coresight_simple_func(type, func, name, offset)                 \
  43 static ssize_t name##_show(struct device *_dev,                         \
  44                            struct device_attribute *attr, char *buf)    \
  45 {                                                                       \
  46         type *drvdata = dev_get_drvdata(_dev->parent);                  \
  47         coresight_read_fn fn = func;                                    \
  48         u32 val;                                                        \
  49         pm_runtime_get_sync(_dev->parent);                              \
  50         if (fn)                                                         \
  51                 val = fn(_dev->parent, offset);                         \
  52         else                                                            \
  53                 val = readl_relaxed(drvdata->base + offset);            \
  54         pm_runtime_put_sync(_dev->parent);                              \
  55         return scnprintf(buf, PAGE_SIZE, "0x%x\n", val);                \
  56 }                                                                       \
  57 static DEVICE_ATTR_RO(name)
  58
  59 enum cs_mode {
  60         CS_MODE_DISABLED,
  61         CS_MODE_SYSFS,
  62         CS_MODE_PERF,
  63 };
  64
  65 /**
  66  * struct cs_buffer - keep track of a recording session' specifics
  67  * @cur:        index of the current buffer
  68  * @nr_pages:   max number of pages granted to us
  69  * @offset:     offset within the current buffer
  70  * @data_size:  how much we collected in this run
  71  * @lost:       other than zero if we had a HW buffer wrap around
  72  * @snapshot:   is this run in snapshot mode
  73  * @data_pages: a handle the ring buffer
  74  */
  75 struct cs_buffers {
  76         unsigned int            cur;
  77         unsigned int            nr_pages;
  78         unsigned long           offset;
  79         local_t                 data_size;
  80         local_t                 lost;
  81         bool                    snapshot;
  82         void                    **data_pages;
  83 };
  84
  85 static inline void CS_LOCK(void __iomem *addr)
  86 {
  87         do {
  88                 /* Wait for things to settle */
  89                 mb();
  90                 writel_relaxed(0x0, addr + CORESIGHT_LAR);
  91         } while (0);
  92 }
  93
  94 static inline void CS_UNLOCK(void __iomem *addr)
  95 {
  96         do {
  97                 writel_relaxed(CORESIGHT_UNLOCK, addr + CORESIGHT_LAR);
  98                 /* Make sure everyone has seen this */
  99                 mb();
 100         } while (0);
 101 }
 102
 103 void coresight_disable_path(struct list_head *path);
 104 int coresight_enable_path(struct list_head *path, u32 mode);
 105 struct coresight_device *coresight_get_sink(struct list_head *path);
 106 struct list_head *coresight_build_path(struct coresight_device *csdev);
 107 void coresight_release_path(struct list_head *path);
 108
 109 #ifdef CONFIG_CORESIGHT_SOURCE_ETM3X
 110 extern int etm_readl_cp14(u32 off, unsigned int *val);
 111 extern int etm_writel_cp14(u32 off, u32 val);
 112 #else
 113 static inline int etm_readl_cp14(u32 off, unsigned int *val) { return 0; }
 114 static inline int etm_writel_cp14(u32 off, u32 val) { return 0; }
 115 #endif
 116
 117 #endif