drivers/hwtracing/coresight/coresight-replicator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
   4  *
   5  * Description: CoreSight Replicator driver
   6  */
   7
   8 #include <linux/acpi.h>
   9 #include <linux/amba/bus.h>
  10 #include <linux/kernel.h>
  11 #include <linux/device.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/io.h>
  14 #include <linux/err.h>
  15 #include <linux/slab.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/property.h>
  18 #include <linux/clk.h>
  19 #include <linux/of.h>
  20 #include <linux/coresight.h>
  21
  22 #include "coresight-priv.h"
  23
  24 #define REPLICATOR_IDFILTER0            0x000
  25 #define REPLICATOR_IDFILTER1            0x004
  26
  27 DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
  28
  29 /**
  30  * struct replicator_drvdata - specifics associated to a replicator component
  31  * @base:       memory mapped base address for this component. Also indicates
  32  *              whether this one is programmable or not.
  33  * @atclk:      optional clock for the core parts of the replicator.
  34  * @csdev:      component vitals needed by the framework
  35  * @spinlock:   serialize enable/disable operations.
  36  * @check_idfilter_val: check if the context is lost upon clock removal.
  37  */
  38 struct replicator_drvdata {
  39         void __iomem            *base;
  40         struct clk              *atclk;
  41         struct coresight_device *csdev;
  42         spinlock_t              spinlock;
  43         bool                    check_idfilter_val;
  44 };
  45
  46 static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)
  47 {
  48         CS_UNLOCK(drvdata->base);
  49
  50         if (!coresight_claim_device_unlocked(drvdata->base)) {
  51                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  52                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  53                 coresight_disclaim_device_unlocked(drvdata->base);
  54         }
  55
  56         CS_LOCK(drvdata->base);
  57 }
  58
  59 /*
  60  * replicator_reset : Reset the replicator configuration to sane values.
  61  */
  62 static inline void replicator_reset(struct replicator_drvdata *drvdata)
  63 {
  64         if (drvdata->base)
  65                 dynamic_replicator_reset(drvdata);
  66 }
  67
  68 static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
  69                                      int inport, int outport)
  70 {
  71         int rc = 0;
  72         u32 id0val, id1val;
  73
  74         CS_UNLOCK(drvdata->base);
  75
  76         id0val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0);
  77         id1val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1);
  78
  79         /*
  80          * Some replicator designs lose context when AMBA clocks are removed,
  81          * so have a check for this.
  82          */
  83         if (drvdata->check_idfilter_val && id0val == 0x0 && id1val == 0x0)
  84                 id0val = id1val = 0xff;
  85
  86         if (id0val == 0xff && id1val == 0xff)
  87                 rc = coresight_claim_device_unlocked(drvdata->base);
  88
  89         if (!rc) {
  90                 switch (outport) {
  91                 case 0:
  92                         id0val = 0x0;
  93                         break;
  94                 case 1:
  95                         id1val = 0x0;
  96                         break;
  97                 default:
  98                         WARN_ON(1);
  99                         rc = -EINVAL;
 100                 }
 101         }
 102
 103         /* Ensure that the outport is enabled. */
 104         if (!rc) {
 105                 writel_relaxed(id0val, drvdata->base + REPLICATOR_IDFILTER0);
 106                 writel_relaxed(id1val, drvdata->base + REPLICATOR_IDFILTER1);
 107         }
 108
 109         CS_LOCK(drvdata->base);
 110
 111         return rc;
 112 }
 113
 114 static int replicator_enable(struct coresight_device *csdev, int inport,
 115                              int outport)
 116 {
 117         int rc = 0;
 118         struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 119         unsigned long flags;
 120         bool first_enable = false;
 121
 122         spin_lock_irqsave(&drvdata->spinlock, flags);
 123         if (atomic_read(&csdev->refcnt[outport]) == 0) {
 124                 if (drvdata->base)
 125                         rc = dynamic_replicator_enable(drvdata, inport,
 126                                                        outport);
 127                 if (!rc)
 128                         first_enable = true;
 129         }
 130         if (!rc)
 131                 atomic_inc(&csdev->refcnt[outport]);
 132         spin_unlock_irqrestore(&drvdata->spinlock, flags);
 133
 134         if (first_enable)
 135                 dev_dbg(&csdev->dev, "REPLICATOR enabled\n");
 136         return rc;
 137 }
 138
 139 static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
 140                                        int inport, int outport)
 141 {
 142         u32 reg;
 143
 144         switch (outport) {
 145         case 0:
 146                 reg = REPLICATOR_IDFILTER0;
 147                 break;
 148         case 1:
 149                 reg = REPLICATOR_IDFILTER1;
 150                 break;
 151         default:
 152                 WARN_ON(1);
 153                 return;
 154         }
 155
 156         CS_UNLOCK(drvdata->base);
 157
 158         /* disable the flow of ATB data through port */
 159         writel_relaxed(0xff, drvdata->base + reg);
 160
 161         if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
 162             (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
 163                 coresight_disclaim_device_unlocked(drvdata->base);
 164         CS_LOCK(drvdata->base);
 165 }
 166
 167 static void replicator_disable(struct coresight_device *csdev, int inport,
 168                                int outport)
 169 {
 170         struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 171         unsigned long flags;
 172         bool last_disable = false;
 173
 174         spin_lock_irqsave(&drvdata->spinlock, flags);
 175         if (atomic_dec_return(&csdev->refcnt[outport]) == 0) {
 176                 if (drvdata->base)
 177                         dynamic_replicator_disable(drvdata, inport, outport);
 178                 last_disable = true;
 179         }
 180         spin_unlock_irqrestore(&drvdata->spinlock, flags);
 181
 182         if (last_disable)
 183                 dev_dbg(&csdev->dev, "REPLICATOR disabled\n");
 184 }
 185
 186 static const struct coresight_ops_link replicator_link_ops = {
 187         .enable         = replicator_enable,
 188         .disable        = replicator_disable,
 189 };
 190
 191 static const struct coresight_ops replicator_cs_ops = {
 192         .link_ops       = &replicator_link_ops,
 193 };
 194
 195 #define coresight_replicator_reg(name, offset) \
 196         coresight_simple_reg32(struct replicator_drvdata, name, offset)
 197
 198 coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
 199 coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
 200
 201 static struct attribute *replicator_mgmt_attrs[] = {
 202         &dev_attr_idfilter0.attr,
 203         &dev_attr_idfilter1.attr,
 204         NULL,
 205 };
 206
 207 static const struct attribute_group replicator_mgmt_group = {
 208         .attrs = replicator_mgmt_attrs,
 209         .name = "mgmt",
 210 };
 211
 212 static const struct attribute_group *replicator_groups[] = {
 213         &replicator_mgmt_group,
 214         NULL,
 215 };
 216
 217 static int replicator_probe(struct device *dev, struct resource *res)
 218 {
 219         int ret = 0;
 220         struct coresight_platform_data *pdata = NULL;
 221         struct replicator_drvdata *drvdata;
 222         struct coresight_desc desc = { 0 };
 223         void __iomem *base;
 224
 225         if (is_of_node(dev_fwnode(dev)) &&
 226             of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
 227                 dev_warn_once(dev,
 228                               "Uses OBSOLETE CoreSight replicator binding\n");
 229
 230         desc.name = coresight_alloc_device_name(&replicator_devs, dev);
 231         if (!desc.name)
 232                 return -ENOMEM;
 233
 234         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 235         if (!drvdata)
 236                 return -ENOMEM;
 237
 238         drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
 239         if (!IS_ERR(drvdata->atclk)) {
 240                 ret = clk_prepare_enable(drvdata->atclk);
 241                 if (ret)
 242                         return ret;
 243         }
 244
 245         /*
 246          * Map the device base for dynamic-replicator, which has been
 247          * validated by AMBA core
 248          */
 249         if (res) {
 250                 base = devm_ioremap_resource(dev, res);
 251                 if (IS_ERR(base)) {
 252                         ret = PTR_ERR(base);
 253                         goto out_disable_clk;
 254                 }
 255                 drvdata->base = base;
 256                 desc.groups = replicator_groups;
 257         }
 258
 259         if (fwnode_property_present(dev_fwnode(dev),
 260                                     "qcom,replicator-loses-context"))
 261                 drvdata->check_idfilter_val = true;
 262
 263         dev_set_drvdata(dev, drvdata);
 264
 265         pdata = coresight_get_platform_data(dev);
 266         if (IS_ERR(pdata)) {
 267                 ret = PTR_ERR(pdata);
 268                 goto out_disable_clk;
 269         }
 270         dev->platform_data = pdata;
 271
 272         spin_lock_init(&drvdata->spinlock);
 273         desc.type = CORESIGHT_DEV_TYPE_LINK;
 274         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 275         desc.ops = &replicator_cs_ops;
 276         desc.pdata = dev->platform_data;
 277         desc.dev = dev;
 278
 279         drvdata->csdev = coresight_register(&desc);
 280         if (IS_ERR(drvdata->csdev)) {
 281                 ret = PTR_ERR(drvdata->csdev);
 282                 goto out_disable_clk;
 283         }
 284
 285         replicator_reset(drvdata);
 286         pm_runtime_put(dev);
 287
 288 out_disable_clk:
 289         if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
 290                 clk_disable_unprepare(drvdata->atclk);
 291         return ret;
 292 }
 293
 294 static int __exit replicator_remove(struct device *dev)
 295 {
 296         struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
 297
 298         coresight_unregister(drvdata->csdev);
 299         return 0;
 300 }
 301
 302 static int static_replicator_probe(struct platform_device *pdev)
 303 {
 304         int ret;
 305
 306         pm_runtime_get_noresume(&pdev->dev);
 307         pm_runtime_set_active(&pdev->dev);
 308         pm_runtime_enable(&pdev->dev);
 309
 310         /* Static replicators do not have programming base */
 311         ret = replicator_probe(&pdev->dev, NULL);
 312
 313         if (ret) {
 314                 pm_runtime_put_noidle(&pdev->dev);
 315                 pm_runtime_disable(&pdev->dev);
 316         }
 317
 318         return ret;
 319 }
 320
 321 static int __exit static_replicator_remove(struct platform_device *pdev)
 322 {
 323         replicator_remove(&pdev->dev);
 324         pm_runtime_disable(&pdev->dev);
 325         return 0;
 326 }
 327
 328 #ifdef CONFIG_PM
 329 static int replicator_runtime_suspend(struct device *dev)
 330 {
 331         struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
 332
 333         if (drvdata && !IS_ERR(drvdata->atclk))
 334                 clk_disable_unprepare(drvdata->atclk);
 335
 336         return 0;
 337 }
 338
 339 static int replicator_runtime_resume(struct device *dev)
 340 {
 341         struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
 342
 343         if (drvdata && !IS_ERR(drvdata->atclk))
 344                 clk_prepare_enable(drvdata->atclk);
 345
 346         return 0;
 347 }
 348 #endif
 349
 350 static const struct dev_pm_ops replicator_dev_pm_ops = {
 351         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 352                            replicator_runtime_resume, NULL)
 353 };
 354
 355 static const struct of_device_id static_replicator_match[] = {
 356         {.compatible = "arm,coresight-replicator"},
 357         {.compatible = "arm,coresight-static-replicator"},
 358         {}
 359 };
 360
 361 MODULE_DEVICE_TABLE(of, static_replicator_match);
 362
 363 #ifdef CONFIG_ACPI
 364 static const struct acpi_device_id static_replicator_acpi_ids[] = {
 365         {"ARMHC985", 0}, /* ARM CoreSight Static Replicator */
 366         {}
 367 };
 368
 369 MODULE_DEVICE_TABLE(acpi, static_replicator_acpi_ids);
 370 #endif
 371
 372 static struct platform_driver static_replicator_driver = {
 373         .probe          = static_replicator_probe,
 374         .remove         = static_replicator_remove,
 375         .driver         = {
 376                 .name   = "coresight-static-replicator",
 377                 .owner  = THIS_MODULE,
 378                 .of_match_table = of_match_ptr(static_replicator_match),
 379                 .acpi_match_table = ACPI_PTR(static_replicator_acpi_ids),
 380                 .pm     = &replicator_dev_pm_ops,
 381                 .suppress_bind_attrs = true,
 382         },
 383 };
 384
 385 static int dynamic_replicator_probe(struct amba_device *adev,
 386                                     const struct amba_id *id)
 387 {
 388         return replicator_probe(&adev->dev, &adev->res);
 389 }
 390
 391 static int __exit dynamic_replicator_remove(struct amba_device *adev)
 392 {
 393         return replicator_remove(&adev->dev);
 394 }
 395
 396 static const struct amba_id dynamic_replicator_ids[] = {
 397         CS_AMBA_ID(0x000bb909),
 398         CS_AMBA_ID(0x000bb9ec),         /* Coresight SoC-600 */
 399         {},
 400 };
 401
 402 MODULE_DEVICE_TABLE(amba, dynamic_replicator_ids);
 403
 404 static struct amba_driver dynamic_replicator_driver = {
 405         .drv = {
 406                 .name   = "coresight-dynamic-replicator",
 407                 .pm     = &replicator_dev_pm_ops,
 408                 .owner  = THIS_MODULE,
 409                 .suppress_bind_attrs = true,
 410         },
 411         .probe          = dynamic_replicator_probe,
 412         .remove         = dynamic_replicator_remove,
 413         .id_table       = dynamic_replicator_ids,
 414 };
 415
 416 static int __init replicator_init(void)
 417 {
 418         int ret;
 419
 420         ret = platform_driver_register(&static_replicator_driver);
 421         if (ret) {
 422                 pr_info("Error registering platform driver\n");
 423                 return ret;
 424         }
 425
 426         ret = amba_driver_register(&dynamic_replicator_driver);
 427         if (ret) {
 428                 pr_info("Error registering amba driver\n");
 429                 platform_driver_unregister(&static_replicator_driver);
 430         }
 431
 432         return ret;
 433 }
 434
 435 static void __exit replicator_exit(void)
 436 {
 437         platform_driver_unregister(&static_replicator_driver);
 438         amba_driver_unregister(&dynamic_replicator_driver);
 439 }
 440
 441 module_init(replicator_init);
 442 module_exit(replicator_exit);
 443
 444 MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
 445 MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
 446 MODULE_DESCRIPTION("Arm CoreSight Replicator Driver");
 447 MODULE_LICENSE("GPL v2");