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 /*
  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         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 replicator_enable(struct coresight_device *csdev, int inport,
  54                               int outport)
  55 {
  56         int rc = 0;
  57         u32 reg;
  58         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  59
  60         switch (outport) {
  61         case 0:
  62                 reg = REPLICATOR_IDFILTER0;
  63                 break;
  64         case 1:
  65                 reg = REPLICATOR_IDFILTER1;
  66                 break;
  67         default:
  68                 WARN_ON(1);
  69                 return -EINVAL;
  70         }
  71
  72         CS_UNLOCK(drvdata->base);
  73
  74         if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
  75             (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
  76                 rc = coresight_claim_device_unlocked(drvdata->base);
  77
  78         /* Ensure that the outport is enabled. */
  79         if (!rc) {
  80                 writel_relaxed(0x00, drvdata->base + reg);
  81                 dev_dbg(drvdata->dev, "REPLICATOR enabled\n");
  82         }
  83
  84         CS_LOCK(drvdata->base);
  85
  86         return rc;
  87 }
  88
  89 static void replicator_disable(struct coresight_device *csdev, int inport,
  90                                 int outport)
  91 {
  92         u32 reg;
  93         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  94
  95         switch (outport) {
  96         case 0:
  97                 reg = REPLICATOR_IDFILTER0;
  98                 break;
  99         case 1:
 100                 reg = REPLICATOR_IDFILTER1;
 101                 break;
 102         default:
 103                 WARN_ON(1);
 104                 return;
 105         }
 106
 107         CS_UNLOCK(drvdata->base);
 108
 109         /* disable the flow of ATB data through port */
 110         writel_relaxed(0xff, drvdata->base + reg);
 111
 112         if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
 113             (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
 114                 coresight_disclaim_device_unlocked(drvdata->base);
 115         CS_LOCK(drvdata->base);
 116
 117         dev_dbg(drvdata->dev, "REPLICATOR disabled\n");
 118 }
 119
 120 static const struct coresight_ops_link replicator_link_ops = {
 121         .enable         = replicator_enable,
 122         .disable        = replicator_disable,
 123 };
 124
 125 static const struct coresight_ops replicator_cs_ops = {
 126         .link_ops       = &replicator_link_ops,
 127 };
 128
 129 #define coresight_replicator_reg(name, offset) \
 130         coresight_simple_reg32(struct replicator_state, name, offset)
 131
 132 coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
 133 coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
 134
 135 static struct attribute *replicator_mgmt_attrs[] = {
 136         &dev_attr_idfilter0.attr,
 137         &dev_attr_idfilter1.attr,
 138         NULL,
 139 };
 140
 141 static const struct attribute_group replicator_mgmt_group = {
 142         .attrs = replicator_mgmt_attrs,
 143         .name = "mgmt",
 144 };
 145
 146 static const struct attribute_group *replicator_groups[] = {
 147         &replicator_mgmt_group,
 148         NULL,
 149 };
 150
 151 static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
 152 {
 153         int ret;
 154         struct device *dev = &adev->dev;
 155         struct resource *res = &adev->res;
 156         struct coresight_platform_data *pdata = NULL;
 157         struct replicator_state *drvdata;
 158         struct coresight_desc desc = { 0 };
 159         struct device_node *np = adev->dev.of_node;
 160         void __iomem *base;
 161
 162         if (np) {
 163                 pdata = of_get_coresight_platform_data(dev, np);
 164                 if (IS_ERR(pdata))
 165                         return PTR_ERR(pdata);
 166                 adev->dev.platform_data = pdata;
 167         }
 168
 169         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 170         if (!drvdata)
 171                 return -ENOMEM;
 172
 173         drvdata->dev = &adev->dev;
 174         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 175         if (!IS_ERR(drvdata->atclk)) {
 176                 ret = clk_prepare_enable(drvdata->atclk);
 177                 if (ret)
 178                         return ret;
 179         }
 180
 181         /* Validity for the resource is already checked by the AMBA core */
 182         base = devm_ioremap_resource(dev, res);
 183         if (IS_ERR(base))
 184                 return PTR_ERR(base);
 185
 186         drvdata->base = base;
 187         dev_set_drvdata(dev, drvdata);
 188         pm_runtime_put(&adev->dev);
 189
 190         desc.type = CORESIGHT_DEV_TYPE_LINK;
 191         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 192         desc.ops = &replicator_cs_ops;
 193         desc.pdata = adev->dev.platform_data;
 194         desc.dev = &adev->dev;
 195         desc.groups = replicator_groups;
 196         drvdata->csdev = coresight_register(&desc);
 197
 198         if (!IS_ERR(drvdata->csdev)) {
 199                 replicator_reset(drvdata);
 200                 return 0;
 201         }
 202         return PTR_ERR(drvdata->csdev);
 203 }
 204
 205 #ifdef CONFIG_PM
 206 static int replicator_runtime_suspend(struct device *dev)
 207 {
 208         struct replicator_state *drvdata = dev_get_drvdata(dev);
 209
 210         if (drvdata && !IS_ERR(drvdata->atclk))
 211                 clk_disable_unprepare(drvdata->atclk);
 212
 213         return 0;
 214 }
 215
 216 static int replicator_runtime_resume(struct device *dev)
 217 {
 218         struct replicator_state *drvdata = dev_get_drvdata(dev);
 219
 220         if (drvdata && !IS_ERR(drvdata->atclk))
 221                 clk_prepare_enable(drvdata->atclk);
 222
 223         return 0;
 224 }
 225 #endif
 226
 227 static const struct dev_pm_ops replicator_dev_pm_ops = {
 228         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 229                            replicator_runtime_resume,
 230                            NULL)
 231 };
 232
 233 static const struct amba_id replicator_ids[] = {
 234         {
 235                 .id     = 0x000bb909,
 236                 .mask   = 0x000fffff,
 237         },
 238         {
 239                 /* Coresight SoC-600 */
 240                 .id     = 0x000bb9ec,
 241                 .mask   = 0x000fffff,
 242         },
 243         { 0, 0 },
 244 };
 245
 246 static struct amba_driver replicator_driver = {
 247         .drv = {
 248                 .name   = "coresight-dynamic-replicator",
 249                 .pm     = &replicator_dev_pm_ops,
 250                 .suppress_bind_attrs = true,
 251         },
 252         .probe          = replicator_probe,
 253         .id_table       = replicator_ids,
 254 };
 255 builtin_amba_driver(replicator_driver);