drivers/hwtracing/coresight/coresight-tpdm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
   4  */
   5
   6 #include <linux/amba/bus.h>
   7 #include <linux/bitmap.h>
   8 #include <linux/coresight.h>
   9 #include <linux/coresight-pmu.h>
  10 #include <linux/device.h>
  11 #include <linux/err.h>
  12 #include <linux/fs.h>
  13 #include <linux/io.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17
  18 #include "coresight-priv.h"
  19 #include "coresight-tpdm.h"
  20
  21 DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
  22
  23 static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
  24 {
  25         u32 val;
  26
  27         /* Set the enable bit of DSB control register to 1 */
  28         val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
  29         val |= TPDM_DSB_CR_ENA;
  30         writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
  31 }
  32
  33 /* TPDM enable operations */
  34 static void __tpdm_enable(struct tpdm_drvdata *drvdata)
  35 {
  36         CS_UNLOCK(drvdata->base);
  37
  38         /* Check if DSB datasets is present for TPDM. */
  39         if (drvdata->datasets & TPDM_PIDR0_DS_DSB)
  40                 tpdm_enable_dsb(drvdata);
  41
  42         CS_LOCK(drvdata->base);
  43 }
  44
  45 static int tpdm_enable(struct coresight_device *csdev, struct perf_event *event,
  46                        enum cs_mode mode)
  47 {
  48         struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  49
  50         spin_lock(&drvdata->spinlock);
  51         if (drvdata->enable) {
  52                 spin_unlock(&drvdata->spinlock);
  53                 return -EBUSY;
  54         }
  55
  56         __tpdm_enable(drvdata);
  57         drvdata->enable = true;
  58         spin_unlock(&drvdata->spinlock);
  59
  60         dev_dbg(drvdata->dev, "TPDM tracing enabled\n");
  61         return 0;
  62 }
  63
  64 static void tpdm_disable_dsb(struct tpdm_drvdata *drvdata)
  65 {
  66         u32 val;
  67
  68         /* Set the enable bit of DSB control register to 0 */
  69         val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
  70         val &= ~TPDM_DSB_CR_ENA;
  71         writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
  72 }
  73
  74 /* TPDM disable operations */
  75 static void __tpdm_disable(struct tpdm_drvdata *drvdata)
  76 {
  77         CS_UNLOCK(drvdata->base);
  78
  79         /* Check if DSB datasets is present for TPDM. */
  80         if (drvdata->datasets & TPDM_PIDR0_DS_DSB)
  81                 tpdm_disable_dsb(drvdata);
  82
  83         CS_LOCK(drvdata->base);
  84 }
  85
  86 static void tpdm_disable(struct coresight_device *csdev,
  87                          struct perf_event *event)
  88 {
  89         struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  90
  91         spin_lock(&drvdata->spinlock);
  92         if (!drvdata->enable) {
  93                 spin_unlock(&drvdata->spinlock);
  94                 return;
  95         }
  96
  97         __tpdm_disable(drvdata);
  98         drvdata->enable = false;
  99         spin_unlock(&drvdata->spinlock);
 100
 101         dev_dbg(drvdata->dev, "TPDM tracing disabled\n");
 102 }
 103
 104 static const struct coresight_ops_source tpdm_source_ops = {
 105         .enable         = tpdm_enable,
 106         .disable        = tpdm_disable,
 107 };
 108
 109 static const struct coresight_ops tpdm_cs_ops = {
 110         .source_ops     = &tpdm_source_ops,
 111 };
 112
 113 static void tpdm_init_default_data(struct tpdm_drvdata *drvdata)
 114 {
 115         u32 pidr;
 116
 117         CS_UNLOCK(drvdata->base);
 118         /*  Get the datasets present on the TPDM. */
 119         pidr = readl_relaxed(drvdata->base + CORESIGHT_PERIPHIDR0);
 120         drvdata->datasets |= pidr & GENMASK(TPDM_DATASETS - 1, 0);
 121         CS_LOCK(drvdata->base);
 122 }
 123
 124 /*
 125  * value 1: 64 bits test data
 126  * value 2: 32 bits test data
 127  */
 128 static ssize_t integration_test_store(struct device *dev,
 129                                           struct device_attribute *attr,
 130                                           const char *buf,
 131                                           size_t size)
 132 {
 133         int i, ret = 0;
 134         unsigned long val;
 135         struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
 136
 137         ret = kstrtoul(buf, 10, &val);
 138         if (ret)
 139                 return ret;
 140
 141         if (val != 1 && val != 2)
 142                 return -EINVAL;
 143
 144         if (!drvdata->enable)
 145                 return -EINVAL;
 146
 147         if (val == 1)
 148                 val = ATBCNTRL_VAL_64;
 149         else
 150                 val = ATBCNTRL_VAL_32;
 151         CS_UNLOCK(drvdata->base);
 152         writel_relaxed(0x1, drvdata->base + TPDM_ITCNTRL);
 153
 154         for (i = 0; i < INTEGRATION_TEST_CYCLE; i++)
 155                 writel_relaxed(val, drvdata->base + TPDM_ITATBCNTRL);
 156
 157         writel_relaxed(0, drvdata->base + TPDM_ITCNTRL);
 158         CS_LOCK(drvdata->base);
 159         return size;
 160 }
 161 static DEVICE_ATTR_WO(integration_test);
 162
 163 static struct attribute *tpdm_attrs[] = {
 164         &dev_attr_integration_test.attr,
 165         NULL,
 166 };
 167
 168 static struct attribute_group tpdm_attr_grp = {
 169         .attrs = tpdm_attrs,
 170 };
 171
 172 static const struct attribute_group *tpdm_attr_grps[] = {
 173         &tpdm_attr_grp,
 174         NULL,
 175 };
 176
 177 static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
 178 {
 179         void __iomem *base;
 180         struct device *dev = &adev->dev;
 181         struct coresight_platform_data *pdata;
 182         struct tpdm_drvdata *drvdata;
 183         struct coresight_desc desc = { 0 };
 184
 185         pdata = coresight_get_platform_data(dev);
 186         if (IS_ERR(pdata))
 187                 return PTR_ERR(pdata);
 188         adev->dev.platform_data = pdata;
 189
 190         /* driver data*/
 191         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 192         if (!drvdata)
 193                 return -ENOMEM;
 194         drvdata->dev = &adev->dev;
 195         dev_set_drvdata(dev, drvdata);
 196
 197         base = devm_ioremap_resource(dev, &adev->res);
 198         if (IS_ERR(base))
 199                 return PTR_ERR(base);
 200
 201         drvdata->base = base;
 202
 203         /* Set up coresight component description */
 204         desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
 205         if (!desc.name)
 206                 return -ENOMEM;
 207         desc.type = CORESIGHT_DEV_TYPE_SOURCE;
 208         desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS;
 209         desc.ops = &tpdm_cs_ops;
 210         desc.pdata = adev->dev.platform_data;
 211         desc.dev = &adev->dev;
 212         desc.access = CSDEV_ACCESS_IOMEM(base);
 213         desc.groups = tpdm_attr_grps;
 214         drvdata->csdev = coresight_register(&desc);
 215         if (IS_ERR(drvdata->csdev))
 216                 return PTR_ERR(drvdata->csdev);
 217
 218         spin_lock_init(&drvdata->spinlock);
 219         tpdm_init_default_data(drvdata);
 220         /* Decrease pm refcount when probe is done.*/
 221         pm_runtime_put(&adev->dev);
 222
 223         return 0;
 224 }
 225
 226 static void tpdm_remove(struct amba_device *adev)
 227 {
 228         struct tpdm_drvdata *drvdata = dev_get_drvdata(&adev->dev);
 229
 230         coresight_unregister(drvdata->csdev);
 231 }
 232
 233 /*
 234  * Different TPDM has different periph id.
 235  * The difference is 0-7 bits' value. So ignore 0-7 bits.
 236  */
 237 static struct amba_id tpdm_ids[] = {
 238         {
 239                 .id = 0x000f0e00,
 240                 .mask = 0x000fff00,
 241         },
 242         { 0, 0},
 243 };
 244
 245 static struct amba_driver tpdm_driver = {
 246         .drv = {
 247                 .name   = "coresight-tpdm",
 248                 .owner  = THIS_MODULE,
 249                 .suppress_bind_attrs = true,
 250         },
 251         .probe          = tpdm_probe,
 252         .id_table       = tpdm_ids,
 253         .remove         = tpdm_remove,
 254 };
 255
 256 module_amba_driver(tpdm_driver);
 257
 258 MODULE_LICENSE("GPL");
 259 MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Monitor driver");