drivers/hwtracing/coresight/coresight-dynamic-replicator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/amba/bus.h>
   7 #include <linux/clk.h>
   8 #include <linux/coresight.h>
   9 #include <linux/device.h>
  10 #include <linux/err.h>
  11 #include <linux/init.h>
  12 #include <linux/io.h>
  13 #include <linux/kernel.h>
  14 #include <linux/of.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/slab.h>
  17
  18 #include "coresight-priv.h"
  19
  20 #define REPLICATOR_IDFILTER0            0x000
  21 #define REPLICATOR_IDFILTER1            0x004
  22
  23 /**
  24  * struct replicator_drvdata - specifics associated to a replicator component
  25  * @base:       memory mapped base address for this component.
  26  * @dev:        the device entity associated with this component
  27  * @atclk:      optional clock for the core parts of the replicator.
  28  * @csdev:      component vitals needed by the framework
  29  */
  30 struct replicator_drvdata {
  31         void __iomem            *base;
  32         struct device           *dev;
  33         struct clk              *atclk;
  34         struct coresight_device *csdev;
  35 };
  36
  37 /*
  38  * dynamic_replicator_reset : Reset the replicator configuration to sane values.
  39  */
  40 static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)
  41 {
  42         CS_UNLOCK(drvdata->base);
  43
  44         if (!coresight_claim_device_unlocked(drvdata->base)) {
  45                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  46                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  47                 coresight_disclaim_device_unlocked(drvdata->base);
  48         }
  49
  50         CS_LOCK(drvdata->base);
  51 }
  52
  53 static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
  54                                      int inport, int outport)
  55 {
  56         int rc = 0;
  57         u32 reg;
  58
  59         switch (outport) {
  60         case 0:
  61                 reg = REPLICATOR_IDFILTER0;
  62                 break;
  63         case 1:
  64                 reg = REPLICATOR_IDFILTER1;
  65                 break;
  66         default:
  67                 WARN_ON(1);
  68                 return -EINVAL;
  69         }
  70
  71         CS_UNLOCK(drvdata->base);
  72
  73         if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
  74             (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
  75                 rc = coresight_claim_device_unlocked(drvdata->base);
  76
  77         /* Ensure that the outport is enabled. */
  78         if (!rc)
  79                 writel_relaxed(0x00, drvdata->base + reg);
  80         CS_LOCK(drvdata->base);
  81
  82         return rc;
  83 }
  84
  85 static int replicator_enable(struct coresight_device *csdev, int inport,
  86                              int outport)
  87 {
  88         int rc = 0;
  89         struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  90
  91         rc = dynamic_replicator_enable(drvdata, inport, outport);
  92         dev_dbg(drvdata->dev, "REPLICATOR enabled\n");
  93         return rc;
  94 }
  95
  96 static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
  97                                        int inport, int outport)
  98 {
  99         u32 reg;
 100
 101         switch (outport) {
 102         case 0:
 103                 reg = REPLICATOR_IDFILTER0;
 104                 break;
 105         case 1:
 106                 reg = REPLICATOR_IDFILTER1;
 107                 break;
 108         default:
 109                 WARN_ON(1);
 110                 return;
 111         }
 112
 113         CS_UNLOCK(drvdata->base);
 114
 115         /* disable the flow of ATB data through port */
 116         writel_relaxed(0xff, drvdata->base + reg);
 117
 118         if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
 119             (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
 120                 coresight_disclaim_device_unlocked(drvdata->base);
 121         CS_LOCK(drvdata->base);
 122 }
 123
 124 static void replicator_disable(struct coresight_device *csdev, int inport,
 125                                int outport)
 126 {
 127         struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 128
 129         dynamic_replicator_disable(drvdata, inport, outport);
 130         dev_dbg(drvdata->dev, "REPLICATOR disabled\n");
 131 }
 132
 133 static const struct coresight_ops_link replicator_link_ops = {
 134         .enable         = replicator_enable,
 135         .disable        = replicator_disable,
 136 };
 137
 138 static const struct coresight_ops replicator_cs_ops = {
 139         .link_ops       = &replicator_link_ops,
 140 };
 141
 142 #define coresight_replicator_reg(name, offset) \
 143         coresight_simple_reg32(struct replicator_drvdata, name, offset)
 144
 145 coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
 146 coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
 147
 148 static struct attribute *replicator_mgmt_attrs[] = {
 149         &dev_attr_idfilter0.attr,
 150         &dev_attr_idfilter1.attr,
 151         NULL,
 152 };
 153
 154 static const struct attribute_group replicator_mgmt_group = {
 155         .attrs = replicator_mgmt_attrs,
 156         .name = "mgmt",
 157 };
 158
 159 static const struct attribute_group *replicator_groups[] = {
 160         &replicator_mgmt_group,
 161         NULL,
 162 };
 163
 164 static int replicator_probe(struct device *dev, struct resource *res)
 165 {
 166         int ret = 0;
 167         struct coresight_platform_data *pdata = NULL;
 168         struct replicator_drvdata *drvdata;
 169         struct coresight_desc desc = { 0 };
 170         struct device_node *np = dev->of_node;
 171         void __iomem *base;
 172
 173         if (np) {
 174                 pdata = of_get_coresight_platform_data(dev, np);
 175                 if (IS_ERR(pdata))
 176                         return PTR_ERR(pdata);
 177                 dev->platform_data = pdata;
 178         }
 179
 180         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 181         if (!drvdata)
 182                 return -ENOMEM;
 183
 184         drvdata->dev = dev;
 185         drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
 186         if (!IS_ERR(drvdata->atclk)) {
 187                 ret = clk_prepare_enable(drvdata->atclk);
 188                 if (ret)
 189                         return ret;
 190         }
 191
 192         /*
 193          * Map the device base for dynamic-replicator, which has been
 194          * validated by AMBA core
 195          */
 196         if (res) {
 197                 base = devm_ioremap_resource(dev, res);
 198                 if (IS_ERR(base)) {
 199                         ret = PTR_ERR(base);
 200                         goto out_disable_clk;
 201                 }
 202                 drvdata->base = base;
 203                 desc.groups = replicator_groups;
 204         }
 205
 206         dev_set_drvdata(dev, drvdata);
 207
 208         desc.type = CORESIGHT_DEV_TYPE_LINK;
 209         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 210         desc.ops = &replicator_cs_ops;
 211         desc.pdata = dev->platform_data;
 212         desc.dev = dev;
 213         drvdata->csdev = coresight_register(&desc);
 214
 215         if (IS_ERR(drvdata->csdev)) {
 216                 ret = PTR_ERR(drvdata->csdev);
 217                 goto out_disable_clk;
 218         }
 219
 220         dynamic_replicator_reset(drvdata);
 221         pm_runtime_put(dev);
 222
 223 out_disable_clk:
 224         if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
 225                 clk_disable_unprepare(drvdata->atclk);
 226         return ret;
 227 }
 228
 229 static int dynamic_replicator_probe(struct amba_device *adev,
 230                                     const struct amba_id *id)
 231 {
 232         return replicator_probe(&adev->dev, &adev->res);
 233 }
 234
 235 #ifdef CONFIG_PM
 236 static int replicator_runtime_suspend(struct device *dev)
 237 {
 238         struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
 239
 240         if (drvdata && !IS_ERR(drvdata->atclk))
 241                 clk_disable_unprepare(drvdata->atclk);
 242
 243         return 0;
 244 }
 245
 246 static int replicator_runtime_resume(struct device *dev)
 247 {
 248         struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
 249
 250         if (drvdata && !IS_ERR(drvdata->atclk))
 251                 clk_prepare_enable(drvdata->atclk);
 252
 253         return 0;
 254 }
 255 #endif
 256
 257 static const struct dev_pm_ops replicator_dev_pm_ops = {
 258         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 259                            replicator_runtime_resume,
 260                            NULL)
 261 };
 262
 263 static const struct amba_id dynamic_replicator_ids[] = {
 264         {
 265                 .id     = 0x000bb909,
 266                 .mask   = 0x000fffff,
 267         },
 268         {
 269                 /* Coresight SoC-600 */
 270                 .id     = 0x000bb9ec,
 271                 .mask   = 0x000fffff,
 272         },
 273         { 0, 0 },
 274 };
 275
 276 static struct amba_driver dynamic_replicator_driver = {
 277         .drv = {
 278                 .name   = "coresight-dynamic-replicator",
 279                 .pm     = &replicator_dev_pm_ops,
 280                 .suppress_bind_attrs = true,
 281         },
 282         .probe          = dynamic_replicator_probe,
 283         .id_table       = dynamic_replicator_ids,
 284 };
 285 builtin_amba_driver(dynamic_replicator_driver);