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/amba/bus.h>
   9 #include <linux/kernel.h>
  10 #include <linux/device.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/io.h>
  13 #include <linux/err.h>
  14 #include <linux/slab.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/clk.h>
  17 #include <linux/of.h>
  18 #include <linux/coresight.h>
  19
  20 #include "coresight-priv.h"
  21
  22 #define REPLICATOR_IDFILTER0            0x000
  23 #define REPLICATOR_IDFILTER1            0x004
  24
  25 /**
  26  * struct replicator_drvdata - specifics associated to a replicator component
  27  * @base:       memory mapped base address for this component. Also indicates
  28  *              whether this one is programmable or not.
  29  * @atclk:      optional clock for the core parts of the replicator.
  30  * @csdev:      component vitals needed by the framework
  31  */
  32 struct replicator_drvdata {
  33         void __iomem            *base;
  34         struct clk              *atclk;
  35         struct coresight_device *csdev;
  36 };
  37
  38 static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)
  39 {
  40         CS_UNLOCK(drvdata->base);
  41
  42         if (!coresight_claim_device_unlocked(drvdata->base)) {
  43                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  44                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  45                 coresight_disclaim_device_unlocked(drvdata->base);
  46         }
  47
  48         CS_LOCK(drvdata->base);
  49 }
  50
  51 /*
  52  * replicator_reset : Reset the replicator configuration to sane values.
  53  */
  54 static inline void replicator_reset(struct replicator_drvdata *drvdata)
  55 {
  56         if (drvdata->base)
  57                 dynamic_replicator_reset(drvdata);
  58 }
  59
  60 static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
  61                                      int inport, int outport)
  62 {
  63         int rc = 0;
  64         u32 reg;
  65
  66         switch (outport) {
  67         case 0:
  68                 reg = REPLICATOR_IDFILTER0;
  69                 break;
  70         case 1:
  71                 reg = REPLICATOR_IDFILTER1;
  72                 break;
  73         default:
  74                 WARN_ON(1);
  75                 return -EINVAL;
  76         }
  77
  78         CS_UNLOCK(drvdata->base);
  79
  80         if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
  81             (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
  82                 rc = coresight_claim_device_unlocked(drvdata->base);
  83
  84         /* Ensure that the outport is enabled. */
  85         if (!rc)
  86                 writel_relaxed(0x00, drvdata->base + reg);
  87         CS_LOCK(drvdata->base);
  88
  89         return rc;
  90 }
  91
  92 static int replicator_enable(struct coresight_device *csdev, int inport,
  93                              int outport)
  94 {
  95         int rc = 0;
  96         struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  97
  98         if (drvdata->base)
  99                 rc = dynamic_replicator_enable(drvdata, inport, outport);
 100         if (!rc)
 101                 dev_dbg(&csdev->dev, "REPLICATOR enabled\n");
 102         return rc;
 103 }
 104
 105 static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
 106                                        int inport, int outport)
 107 {
 108         u32 reg;
 109
 110         switch (outport) {
 111         case 0:
 112                 reg = REPLICATOR_IDFILTER0;
 113                 break;
 114         case 1:
 115                 reg = REPLICATOR_IDFILTER1;
 116                 break;
 117         default:
 118                 WARN_ON(1);
 119                 return;
 120         }
 121
 122         CS_UNLOCK(drvdata->base);
 123
 124         /* disable the flow of ATB data through port */
 125         writel_relaxed(0xff, drvdata->base + reg);
 126
 127         if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
 128             (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
 129                 coresight_disclaim_device_unlocked(drvdata->base);
 130         CS_LOCK(drvdata->base);
 131 }
 132
 133 static void replicator_disable(struct coresight_device *csdev, int inport,
 134                                int outport)
 135 {
 136         struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 137
 138         if (drvdata->base)
 139                 dynamic_replicator_disable(drvdata, inport, outport);
 140         dev_dbg(&csdev->dev, "REPLICATOR disabled\n");
 141 }
 142
 143 static const struct coresight_ops_link replicator_link_ops = {
 144         .enable         = replicator_enable,
 145         .disable        = replicator_disable,
 146 };
 147
 148 static const struct coresight_ops replicator_cs_ops = {
 149         .link_ops       = &replicator_link_ops,
 150 };
 151
 152 #define coresight_replicator_reg(name, offset) \
 153         coresight_simple_reg32(struct replicator_drvdata, name, offset)
 154
 155 coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
 156 coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
 157
 158 static struct attribute *replicator_mgmt_attrs[] = {
 159         &dev_attr_idfilter0.attr,
 160         &dev_attr_idfilter1.attr,
 161         NULL,
 162 };
 163
 164 static const struct attribute_group replicator_mgmt_group = {
 165         .attrs = replicator_mgmt_attrs,
 166         .name = "mgmt",
 167 };
 168
 169 static const struct attribute_group *replicator_groups[] = {
 170         &replicator_mgmt_group,
 171         NULL,
 172 };
 173
 174 static int replicator_probe(struct device *dev, struct resource *res)
 175 {
 176         int ret = 0;
 177         struct coresight_platform_data *pdata = NULL;
 178         struct replicator_drvdata *drvdata;
 179         struct coresight_desc desc = { 0 };
 180         void __iomem *base;
 181
 182         pdata = coresight_get_platform_data(dev);
 183         if (IS_ERR(pdata))
 184                 return PTR_ERR(pdata);
 185         dev->platform_data = pdata;
 186
 187         if (is_of_node(dev_fwnode(dev)) &&
 188             of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
 189                 pr_warn_once("Uses OBSOLETE CoreSight replicator binding\n");
 190
 191         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 192         if (!drvdata)
 193                 return -ENOMEM;
 194
 195         drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
 196         if (!IS_ERR(drvdata->atclk)) {
 197                 ret = clk_prepare_enable(drvdata->atclk);
 198                 if (ret)
 199                         return ret;
 200         }
 201
 202         /*
 203          * Map the device base for dynamic-replicator, which has been
 204          * validated by AMBA core
 205          */
 206         if (res) {
 207                 base = devm_ioremap_resource(dev, res);
 208                 if (IS_ERR(base)) {
 209                         ret = PTR_ERR(base);
 210                         goto out_disable_clk;
 211                 }
 212                 drvdata->base = base;
 213                 desc.groups = replicator_groups;
 214         }
 215
 216         dev_set_drvdata(dev, drvdata);
 217
 218         desc.type = CORESIGHT_DEV_TYPE_LINK;
 219         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 220         desc.ops = &replicator_cs_ops;
 221         desc.pdata = dev->platform_data;
 222         desc.dev = dev;
 223         desc.name = dev_name(dev);
 224
 225         drvdata->csdev = coresight_register(&desc);
 226         if (IS_ERR(drvdata->csdev)) {
 227                 ret = PTR_ERR(drvdata->csdev);
 228                 goto out_disable_clk;
 229         }
 230
 231         replicator_reset(drvdata);
 232         pm_runtime_put(dev);
 233
 234 out_disable_clk:
 235         if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
 236                 clk_disable_unprepare(drvdata->atclk);
 237         return ret;
 238 }
 239
 240 static int static_replicator_probe(struct platform_device *pdev)
 241 {
 242         int ret;
 243
 244         pm_runtime_get_noresume(&pdev->dev);
 245         pm_runtime_set_active(&pdev->dev);
 246         pm_runtime_enable(&pdev->dev);
 247
 248         /* Static replicators do not have programming base */
 249         ret = replicator_probe(&pdev->dev, NULL);
 250
 251         if (ret) {
 252                 pm_runtime_put_noidle(&pdev->dev);
 253                 pm_runtime_disable(&pdev->dev);
 254         }
 255
 256         return ret;
 257 }
 258
 259 #ifdef CONFIG_PM
 260 static int replicator_runtime_suspend(struct device *dev)
 261 {
 262         struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
 263
 264         if (drvdata && !IS_ERR(drvdata->atclk))
 265                 clk_disable_unprepare(drvdata->atclk);
 266
 267         return 0;
 268 }
 269
 270 static int replicator_runtime_resume(struct device *dev)
 271 {
 272         struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
 273
 274         if (drvdata && !IS_ERR(drvdata->atclk))
 275                 clk_prepare_enable(drvdata->atclk);
 276
 277         return 0;
 278 }
 279 #endif
 280
 281 static const struct dev_pm_ops replicator_dev_pm_ops = {
 282         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 283                            replicator_runtime_resume, NULL)
 284 };
 285
 286 static const struct of_device_id static_replicator_match[] = {
 287         {.compatible = "arm,coresight-replicator"},
 288         {.compatible = "arm,coresight-static-replicator"},
 289         {}
 290 };
 291
 292 static struct platform_driver static_replicator_driver = {
 293         .probe          = static_replicator_probe,
 294         .driver         = {
 295                 .name   = "coresight-static-replicator",
 296                 .of_match_table = static_replicator_match,
 297                 .pm     = &replicator_dev_pm_ops,
 298                 .suppress_bind_attrs = true,
 299         },
 300 };
 301 builtin_platform_driver(static_replicator_driver);
 302
 303 static int dynamic_replicator_probe(struct amba_device *adev,
 304                                     const struct amba_id *id)
 305 {
 306         return replicator_probe(&adev->dev, &adev->res);
 307 }
 308
 309 static const struct amba_id dynamic_replicator_ids[] = {
 310         {
 311                 .id     = 0x000bb909,
 312                 .mask   = 0x000fffff,
 313         },
 314         {
 315                 /* Coresight SoC-600 */
 316                 .id     = 0x000bb9ec,
 317                 .mask   = 0x000fffff,
 318         },
 319         { 0, 0 },
 320 };
 321
 322 static struct amba_driver dynamic_replicator_driver = {
 323         .drv = {
 324                 .name   = "coresight-dynamic-replicator",
 325                 .pm     = &replicator_dev_pm_ops,
 326                 .suppress_bind_attrs = true,
 327         },
 328         .probe          = dynamic_replicator_probe,
 329         .id_table       = dynamic_replicator_ids,
 330 };
 331 builtin_amba_driver(dynamic_replicator_driver);