drivers/hwtracing/coresight/coresight-funnel.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
   4  *
   5  * Description: CoreSight Funnel driver
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/types.h>
  11 #include <linux/device.h>
  12 #include <linux/err.h>
  13 #include <linux/fs.h>
  14 #include <linux/slab.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/coresight.h>
  19 #include <linux/amba/bus.h>
  20 #include <linux/clk.h>
  21
  22 #include "coresight-priv.h"
  23
  24 #define FUNNEL_FUNCTL           0x000
  25 #define FUNNEL_PRICTL           0x004
  26
  27 #define FUNNEL_HOLDTIME_MASK    0xf00
  28 #define FUNNEL_HOLDTIME_SHFT    0x8
  29 #define FUNNEL_HOLDTIME         (0x7 << FUNNEL_HOLDTIME_SHFT)
  30 #define FUNNEL_ENSx_MASK        0xff
  31
  32 /**
  33  * struct funnel_drvdata - specifics associated to a funnel component
  34  * @base:       memory mapped base address for this component.
  35  * @atclk:      optional clock for the core parts of the funnel.
  36  * @csdev:      component vitals needed by the framework.
  37  * @priority:   port selection order.
  38  */
  39 struct funnel_drvdata {
  40         void __iomem            *base;
  41         struct clk              *atclk;
  42         struct coresight_device *csdev;
  43         unsigned long           priority;
  44 };
  45
  46 static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
  47 {
  48         u32 functl;
  49         int rc = 0;
  50
  51         CS_UNLOCK(drvdata->base);
  52
  53         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  54         /* Claim the device only when we enable the first slave */
  55         if (!(functl & FUNNEL_ENSx_MASK)) {
  56                 rc = coresight_claim_device_unlocked(drvdata->base);
  57                 if (rc)
  58                         goto done;
  59         }
  60
  61         functl &= ~FUNNEL_HOLDTIME_MASK;
  62         functl |= FUNNEL_HOLDTIME;
  63         functl |= (1 << port);
  64         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  65         writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
  66 done:
  67         CS_LOCK(drvdata->base);
  68         return rc;
  69 }
  70
  71 static int funnel_enable(struct coresight_device *csdev, int inport,
  72                          int outport)
  73 {
  74         int rc = 0;
  75         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  76
  77         if (drvdata->base)
  78                 rc = dynamic_funnel_enable_hw(drvdata, inport);
  79
  80         if (!rc)
  81                 dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n", inport);
  82         return rc;
  83 }
  84
  85 static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
  86                                       int inport)
  87 {
  88         u32 functl;
  89
  90         CS_UNLOCK(drvdata->base);
  91
  92         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  93         functl &= ~(1 << inport);
  94         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  95
  96         /* Disclaim the device if none of the slaves are now active */
  97         if (!(functl & FUNNEL_ENSx_MASK))
  98                 coresight_disclaim_device_unlocked(drvdata->base);
  99
 100         CS_LOCK(drvdata->base);
 101 }
 102
 103 static void funnel_disable(struct coresight_device *csdev, int inport,
 104                            int outport)
 105 {
 106         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 107
 108         if (drvdata->base)
 109                 dynamic_funnel_disable_hw(drvdata, inport);
 110
 111         dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n", inport);
 112 }
 113
 114 static const struct coresight_ops_link funnel_link_ops = {
 115         .enable         = funnel_enable,
 116         .disable        = funnel_disable,
 117 };
 118
 119 static const struct coresight_ops funnel_cs_ops = {
 120         .link_ops       = &funnel_link_ops,
 121 };
 122
 123 static ssize_t priority_show(struct device *dev,
 124                              struct device_attribute *attr, char *buf)
 125 {
 126         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 127         unsigned long val = drvdata->priority;
 128
 129         return sprintf(buf, "%#lx\n", val);
 130 }
 131
 132 static ssize_t priority_store(struct device *dev,
 133                               struct device_attribute *attr,
 134                               const char *buf, size_t size)
 135 {
 136         int ret;
 137         unsigned long val;
 138         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 139
 140         ret = kstrtoul(buf, 16, &val);
 141         if (ret)
 142                 return ret;
 143
 144         drvdata->priority = val;
 145         return size;
 146 }
 147 static DEVICE_ATTR_RW(priority);
 148
 149 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
 150 {
 151         u32 functl;
 152
 153         CS_UNLOCK(drvdata->base);
 154         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 155         CS_LOCK(drvdata->base);
 156
 157         return functl;
 158 }
 159
 160 static ssize_t funnel_ctrl_show(struct device *dev,
 161                              struct device_attribute *attr, char *buf)
 162 {
 163         u32 val;
 164         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 165
 166         pm_runtime_get_sync(dev->parent);
 167
 168         val = get_funnel_ctrl_hw(drvdata);
 169
 170         pm_runtime_put(dev->parent);
 171
 172         return sprintf(buf, "%#x\n", val);
 173 }
 174 static DEVICE_ATTR_RO(funnel_ctrl);
 175
 176 static struct attribute *coresight_funnel_attrs[] = {
 177         &dev_attr_funnel_ctrl.attr,
 178         &dev_attr_priority.attr,
 179         NULL,
 180 };
 181 ATTRIBUTE_GROUPS(coresight_funnel);
 182
 183 static int funnel_probe(struct device *dev, struct resource *res)
 184 {
 185         int ret;
 186         void __iomem *base;
 187         struct coresight_platform_data *pdata = NULL;
 188         struct funnel_drvdata *drvdata;
 189         struct coresight_desc desc = { 0 };
 190
 191         pdata = coresight_get_platform_data(dev);
 192         if (IS_ERR(pdata))
 193                 return PTR_ERR(pdata);
 194         dev->platform_data = pdata;
 195
 196         if (is_of_node(dev_fwnode(dev)) &&
 197             of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
 198                 pr_warn_once("Uses OBSOLETE CoreSight funnel binding\n");
 199
 200         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 201         if (!drvdata)
 202                 return -ENOMEM;
 203
 204         drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
 205         if (!IS_ERR(drvdata->atclk)) {
 206                 ret = clk_prepare_enable(drvdata->atclk);
 207                 if (ret)
 208                         return ret;
 209         }
 210
 211         /*
 212          * Map the device base for dynamic-funnel, which has been
 213          * validated by AMBA core.
 214          */
 215         if (res) {
 216                 base = devm_ioremap_resource(dev, res);
 217                 if (IS_ERR(base)) {
 218                         ret = PTR_ERR(base);
 219                         goto out_disable_clk;
 220                 }
 221                 drvdata->base = base;
 222                 desc.groups = coresight_funnel_groups;
 223         }
 224
 225         dev_set_drvdata(dev, drvdata);
 226
 227         desc.type = CORESIGHT_DEV_TYPE_LINK;
 228         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
 229         desc.ops = &funnel_cs_ops;
 230         desc.pdata = pdata;
 231         desc.dev = dev;
 232         desc.name = dev_name(dev);
 233         drvdata->csdev = coresight_register(&desc);
 234         if (IS_ERR(drvdata->csdev)) {
 235                 ret = PTR_ERR(drvdata->csdev);
 236                 goto out_disable_clk;
 237         }
 238
 239         pm_runtime_put(dev);
 240
 241 out_disable_clk:
 242         if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
 243                 clk_disable_unprepare(drvdata->atclk);
 244         return ret;
 245 }
 246
 247 #ifdef CONFIG_PM
 248 static int funnel_runtime_suspend(struct device *dev)
 249 {
 250         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 251
 252         if (drvdata && !IS_ERR(drvdata->atclk))
 253                 clk_disable_unprepare(drvdata->atclk);
 254
 255         return 0;
 256 }
 257
 258 static int funnel_runtime_resume(struct device *dev)
 259 {
 260         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 261
 262         if (drvdata && !IS_ERR(drvdata->atclk))
 263                 clk_prepare_enable(drvdata->atclk);
 264
 265         return 0;
 266 }
 267 #endif
 268
 269 static const struct dev_pm_ops funnel_dev_pm_ops = {
 270         SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
 271 };
 272
 273 static int static_funnel_probe(struct platform_device *pdev)
 274 {
 275         int ret;
 276
 277         pm_runtime_get_noresume(&pdev->dev);
 278         pm_runtime_set_active(&pdev->dev);
 279         pm_runtime_enable(&pdev->dev);
 280
 281         /* Static funnel do not have programming base */
 282         ret = funnel_probe(&pdev->dev, NULL);
 283
 284         if (ret) {
 285                 pm_runtime_put_noidle(&pdev->dev);
 286                 pm_runtime_disable(&pdev->dev);
 287         }
 288
 289         return ret;
 290 }
 291
 292 static const struct of_device_id static_funnel_match[] = {
 293         {.compatible = "arm,coresight-static-funnel"},
 294         {}
 295 };
 296
 297 static struct platform_driver static_funnel_driver = {
 298         .probe          = static_funnel_probe,
 299         .driver         = {
 300                 .name   = "coresight-static-funnel",
 301                 .of_match_table = static_funnel_match,
 302                 .pm     = &funnel_dev_pm_ops,
 303                 .suppress_bind_attrs = true,
 304         },
 305 };
 306 builtin_platform_driver(static_funnel_driver);
 307
 308 static int dynamic_funnel_probe(struct amba_device *adev,
 309                                 const struct amba_id *id)
 310 {
 311         return funnel_probe(&adev->dev, &adev->res);
 312 }
 313
 314 static const struct amba_id dynamic_funnel_ids[] = {
 315         {
 316                 .id     = 0x000bb908,
 317                 .mask   = 0x000fffff,
 318         },
 319         {
 320                 /* Coresight SoC-600 */
 321                 .id     = 0x000bb9eb,
 322                 .mask   = 0x000fffff,
 323         },
 324         { 0, 0},
 325 };
 326
 327 static struct amba_driver dynamic_funnel_driver = {
 328         .drv = {
 329                 .name   = "coresight-dynamic-funnel",
 330                 .owner  = THIS_MODULE,
 331                 .pm     = &funnel_dev_pm_ops,
 332                 .suppress_bind_attrs = true,
 333         },
 334         .probe          = dynamic_funnel_probe,
 335         .id_table       = dynamic_funnel_ids,
 336 };
 337 builtin_amba_driver(dynamic_funnel_driver);