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_state - 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_state {
  31         void __iomem            *base;
  32         struct device           *dev;
  33         struct clk              *atclk;
  34         struct coresight_device *csdev;
  35 };
  36
  37 static int replicator_enable(struct coresight_device *csdev, int inport,
  38                               int outport)
  39 {
  40         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  41
  42         CS_UNLOCK(drvdata->base);
  43
  44         /*
  45          * Ensure that the other port is disabled
  46          * 0x00 - passing through the replicator unimpeded
  47          * 0xff - disable (or impede) the flow of ATB data
  48          */
  49         if (outport == 0) {
  50                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0);
  51                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  52         } else {
  53                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1);
  54                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  55         }
  56
  57         CS_LOCK(drvdata->base);
  58
  59         dev_info(drvdata->dev, "REPLICATOR enabled\n");
  60         return 0;
  61 }
  62
  63 static void replicator_disable(struct coresight_device *csdev, int inport,
  64                                 int outport)
  65 {
  66         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  67
  68         CS_UNLOCK(drvdata->base);
  69
  70         /* disable the flow of ATB data through port */
  71         if (outport == 0)
  72                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  73         else
  74                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  75
  76         CS_LOCK(drvdata->base);
  77
  78         dev_info(drvdata->dev, "REPLICATOR disabled\n");
  79 }
  80
  81 static const struct coresight_ops_link replicator_link_ops = {
  82         .enable         = replicator_enable,
  83         .disable        = replicator_disable,
  84 };
  85
  86 static const struct coresight_ops replicator_cs_ops = {
  87         .link_ops       = &replicator_link_ops,
  88 };
  89
  90 #define coresight_replicator_reg(name, offset) \
  91         coresight_simple_reg32(struct replicator_state, name, offset)
  92
  93 coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
  94 coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
  95
  96 static struct attribute *replicator_mgmt_attrs[] = {
  97         &dev_attr_idfilter0.attr,
  98         &dev_attr_idfilter1.attr,
  99         NULL,
 100 };
 101
 102 static const struct attribute_group replicator_mgmt_group = {
 103         .attrs = replicator_mgmt_attrs,
 104         .name = "mgmt",
 105 };
 106
 107 static const struct attribute_group *replicator_groups[] = {
 108         &replicator_mgmt_group,
 109         NULL,
 110 };
 111
 112 static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
 113 {
 114         int ret;
 115         struct device *dev = &adev->dev;
 116         struct resource *res = &adev->res;
 117         struct coresight_platform_data *pdata = NULL;
 118         struct replicator_state *drvdata;
 119         struct coresight_desc desc = { 0 };
 120         struct device_node *np = adev->dev.of_node;
 121         void __iomem *base;
 122
 123         if (np) {
 124                 pdata = of_get_coresight_platform_data(dev, np);
 125                 if (IS_ERR(pdata))
 126                         return PTR_ERR(pdata);
 127                 adev->dev.platform_data = pdata;
 128         }
 129
 130         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 131         if (!drvdata)
 132                 return -ENOMEM;
 133
 134         drvdata->dev = &adev->dev;
 135         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 136         if (!IS_ERR(drvdata->atclk)) {
 137                 ret = clk_prepare_enable(drvdata->atclk);
 138                 if (ret)
 139                         return ret;
 140         }
 141
 142         /* Validity for the resource is already checked by the AMBA core */
 143         base = devm_ioremap_resource(dev, res);
 144         if (IS_ERR(base))
 145                 return PTR_ERR(base);
 146
 147         drvdata->base = base;
 148         dev_set_drvdata(dev, drvdata);
 149         pm_runtime_put(&adev->dev);
 150
 151         desc.type = CORESIGHT_DEV_TYPE_LINK;
 152         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 153         desc.ops = &replicator_cs_ops;
 154         desc.pdata = adev->dev.platform_data;
 155         desc.dev = &adev->dev;
 156         desc.groups = replicator_groups;
 157         drvdata->csdev = coresight_register(&desc);
 158
 159         return PTR_ERR_OR_ZERO(drvdata->csdev);
 160 }
 161
 162 #ifdef CONFIG_PM
 163 static int replicator_runtime_suspend(struct device *dev)
 164 {
 165         struct replicator_state *drvdata = dev_get_drvdata(dev);
 166
 167         if (drvdata && !IS_ERR(drvdata->atclk))
 168                 clk_disable_unprepare(drvdata->atclk);
 169
 170         return 0;
 171 }
 172
 173 static int replicator_runtime_resume(struct device *dev)
 174 {
 175         struct replicator_state *drvdata = dev_get_drvdata(dev);
 176
 177         if (drvdata && !IS_ERR(drvdata->atclk))
 178                 clk_prepare_enable(drvdata->atclk);
 179
 180         return 0;
 181 }
 182 #endif
 183
 184 static const struct dev_pm_ops replicator_dev_pm_ops = {
 185         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 186                            replicator_runtime_resume,
 187                            NULL)
 188 };
 189
 190 static const struct amba_id replicator_ids[] = {
 191         {
 192                 .id     = 0x000bb909,
 193                 .mask   = 0x000fffff,
 194         },
 195         {
 196                 /* Coresight SoC-600 */
 197                 .id     = 0x000bb9ec,
 198                 .mask   = 0x000fffff,
 199         },
 200         { 0, 0 },
 201 };
 202
 203 static struct amba_driver replicator_driver = {
 204         .drv = {
 205                 .name   = "coresight-dynamic-replicator",
 206                 .pm     = &replicator_dev_pm_ops,
 207                 .suppress_bind_attrs = true,
 208         },
 209         .probe          = replicator_probe,
 210         .id_table       = replicator_ids,
 211 };
 212 builtin_amba_driver(replicator_driver);