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 /*
  38  * replicator_reset : Reset the replicator configuration to sane values.
  39  */
  40 static void replicator_reset(struct replicator_state *drvdata)
  41 {
  42         CS_UNLOCK(drvdata->base);
  43
  44         writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  45         writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  46
  47         CS_LOCK(drvdata->base);
  48 }
  49
  50 static int replicator_enable(struct coresight_device *csdev, int inport,
  51                               int outport)
  52 {
  53         u32 reg;
  54         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  55
  56         switch (outport) {
  57         case 0:
  58                 reg = REPLICATOR_IDFILTER0;
  59                 break;
  60         case 1:
  61                 reg = REPLICATOR_IDFILTER1;
  62                 break;
  63         default:
  64                 WARN_ON(1);
  65                 return -EINVAL;
  66         }
  67
  68         CS_UNLOCK(drvdata->base);
  69
  70
  71         /* Ensure that the outport is enabled. */
  72         writel_relaxed(0x00, drvdata->base + reg);
  73         CS_LOCK(drvdata->base);
  74
  75         dev_info(drvdata->dev, "REPLICATOR enabled\n");
  76         return 0;
  77 }
  78
  79 static void replicator_disable(struct coresight_device *csdev, int inport,
  80                                 int outport)
  81 {
  82         u32 reg;
  83         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  84
  85         switch (outport) {
  86         case 0:
  87                 reg = REPLICATOR_IDFILTER0;
  88                 break;
  89         case 1:
  90                 reg = REPLICATOR_IDFILTER1;
  91                 break;
  92         default:
  93                 WARN_ON(1);
  94                 return;
  95         }
  96
  97         CS_UNLOCK(drvdata->base);
  98
  99         /* disable the flow of ATB data through port */
 100         writel_relaxed(0xff, drvdata->base + reg);
 101
 102         CS_LOCK(drvdata->base);
 103
 104         dev_info(drvdata->dev, "REPLICATOR disabled\n");
 105 }
 106
 107 static const struct coresight_ops_link replicator_link_ops = {
 108         .enable         = replicator_enable,
 109         .disable        = replicator_disable,
 110 };
 111
 112 static const struct coresight_ops replicator_cs_ops = {
 113         .link_ops       = &replicator_link_ops,
 114 };
 115
 116 #define coresight_replicator_reg(name, offset) \
 117         coresight_simple_reg32(struct replicator_state, name, offset)
 118
 119 coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
 120 coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
 121
 122 static struct attribute *replicator_mgmt_attrs[] = {
 123         &dev_attr_idfilter0.attr,
 124         &dev_attr_idfilter1.attr,
 125         NULL,
 126 };
 127
 128 static const struct attribute_group replicator_mgmt_group = {
 129         .attrs = replicator_mgmt_attrs,
 130         .name = "mgmt",
 131 };
 132
 133 static const struct attribute_group *replicator_groups[] = {
 134         &replicator_mgmt_group,
 135         NULL,
 136 };
 137
 138 static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
 139 {
 140         int ret;
 141         struct device *dev = &adev->dev;
 142         struct resource *res = &adev->res;
 143         struct coresight_platform_data *pdata = NULL;
 144         struct replicator_state *drvdata;
 145         struct coresight_desc desc = { 0 };
 146         struct device_node *np = adev->dev.of_node;
 147         void __iomem *base;
 148
 149         if (np) {
 150                 pdata = of_get_coresight_platform_data(dev, np);
 151                 if (IS_ERR(pdata))
 152                         return PTR_ERR(pdata);
 153                 adev->dev.platform_data = pdata;
 154         }
 155
 156         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 157         if (!drvdata)
 158                 return -ENOMEM;
 159
 160         drvdata->dev = &adev->dev;
 161         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 162         if (!IS_ERR(drvdata->atclk)) {
 163                 ret = clk_prepare_enable(drvdata->atclk);
 164                 if (ret)
 165                         return ret;
 166         }
 167
 168         /* Validity for the resource is already checked by the AMBA core */
 169         base = devm_ioremap_resource(dev, res);
 170         if (IS_ERR(base))
 171                 return PTR_ERR(base);
 172
 173         drvdata->base = base;
 174         dev_set_drvdata(dev, drvdata);
 175         pm_runtime_put(&adev->dev);
 176
 177         desc.type = CORESIGHT_DEV_TYPE_LINK;
 178         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 179         desc.ops = &replicator_cs_ops;
 180         desc.pdata = adev->dev.platform_data;
 181         desc.dev = &adev->dev;
 182         desc.groups = replicator_groups;
 183         drvdata->csdev = coresight_register(&desc);
 184
 185         if (!IS_ERR(drvdata->csdev)) {
 186                 replicator_reset(drvdata);
 187                 return 0;
 188         }
 189         return PTR_ERR(drvdata->csdev);
 190 }
 191
 192 #ifdef CONFIG_PM
 193 static int replicator_runtime_suspend(struct device *dev)
 194 {
 195         struct replicator_state *drvdata = dev_get_drvdata(dev);
 196
 197         if (drvdata && !IS_ERR(drvdata->atclk))
 198                 clk_disable_unprepare(drvdata->atclk);
 199
 200         return 0;
 201 }
 202
 203 static int replicator_runtime_resume(struct device *dev)
 204 {
 205         struct replicator_state *drvdata = dev_get_drvdata(dev);
 206
 207         if (drvdata && !IS_ERR(drvdata->atclk))
 208                 clk_prepare_enable(drvdata->atclk);
 209
 210         return 0;
 211 }
 212 #endif
 213
 214 static const struct dev_pm_ops replicator_dev_pm_ops = {
 215         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 216                            replicator_runtime_resume,
 217                            NULL)
 218 };
 219
 220 static const struct amba_id replicator_ids[] = {
 221         {
 222                 .id     = 0x000bb909,
 223                 .mask   = 0x000fffff,
 224         },
 225         {
 226                 /* Coresight SoC-600 */
 227                 .id     = 0x000bb9ec,
 228                 .mask   = 0x000fffff,
 229         },
 230         { 0, 0 },
 231 };
 232
 233 static struct amba_driver replicator_driver = {
 234         .drv = {
 235                 .name   = "coresight-dynamic-replicator",
 236                 .pm     = &replicator_dev_pm_ops,
 237                 .suppress_bind_attrs = true,
 238         },
 239         .probe          = replicator_probe,
 240         .id_table       = replicator_ids,
 241 };
 242 builtin_amba_driver(replicator_driver);