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

   1 /*
   2  * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/amba/bus.h>
  15 #include <linux/clk.h>
  16 #include <linux/coresight.h>
  17 #include <linux/device.h>
  18 #include <linux/err.h>
  19 #include <linux/init.h>
  20 #include <linux/io.h>
  21 #include <linux/kernel.h>
  22 #include <linux/of.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/slab.h>
  25
  26 #include "coresight-priv.h"
  27
  28 #define REPLICATOR_IDFILTER0            0x000
  29 #define REPLICATOR_IDFILTER1            0x004
  30
  31 /**
  32  * struct replicator_state - specifics associated to a replicator component
  33  * @base:       memory mapped base address for this component.
  34  * @dev:        the device entity associated with this component
  35  * @atclk:      optional clock for the core parts of the replicator.
  36  * @csdev:      component vitals needed by the framework
  37  */
  38 struct replicator_state {
  39         void __iomem            *base;
  40         struct device           *dev;
  41         struct clk              *atclk;
  42         struct coresight_device *csdev;
  43 };
  44
  45 static int replicator_enable(struct coresight_device *csdev, int inport,
  46                               int outport)
  47 {
  48         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  49
  50         CS_UNLOCK(drvdata->base);
  51
  52         /*
  53          * Ensure that the other port is disabled
  54          * 0x00 - passing through the replicator unimpeded
  55          * 0xff - disable (or impede) the flow of ATB data
  56          */
  57         if (outport == 0) {
  58                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0);
  59                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  60         } else {
  61                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1);
  62                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  63         }
  64
  65         CS_LOCK(drvdata->base);
  66
  67         dev_info(drvdata->dev, "REPLICATOR enabled\n");
  68         return 0;
  69 }
  70
  71 static void replicator_disable(struct coresight_device *csdev, int inport,
  72                                 int outport)
  73 {
  74         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  75
  76         CS_UNLOCK(drvdata->base);
  77
  78         /* disable the flow of ATB data through port */
  79         if (outport == 0)
  80                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  81         else
  82                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  83
  84         CS_LOCK(drvdata->base);
  85
  86         dev_info(drvdata->dev, "REPLICATOR disabled\n");
  87 }
  88
  89 static const struct coresight_ops_link replicator_link_ops = {
  90         .enable         = replicator_enable,
  91         .disable        = replicator_disable,
  92 };
  93
  94 static const struct coresight_ops replicator_cs_ops = {
  95         .link_ops       = &replicator_link_ops,
  96 };
  97
  98 #define coresight_replicator_reg(name, offset) \
  99         coresight_simple_reg32(struct replicator_state, name, offset)
 100
 101 coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
 102 coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
 103
 104 static struct attribute *replicator_mgmt_attrs[] = {
 105         &dev_attr_idfilter0.attr,
 106         &dev_attr_idfilter1.attr,
 107         NULL,
 108 };
 109
 110 static const struct attribute_group replicator_mgmt_group = {
 111         .attrs = replicator_mgmt_attrs,
 112         .name = "mgmt",
 113 };
 114
 115 static const struct attribute_group *replicator_groups[] = {
 116         &replicator_mgmt_group,
 117         NULL,
 118 };
 119
 120 static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
 121 {
 122         int ret;
 123         struct device *dev = &adev->dev;
 124         struct resource *res = &adev->res;
 125         struct coresight_platform_data *pdata = NULL;
 126         struct replicator_state *drvdata;
 127         struct coresight_desc desc = { 0 };
 128         struct device_node *np = adev->dev.of_node;
 129         void __iomem *base;
 130
 131         if (np) {
 132                 pdata = of_get_coresight_platform_data(dev, np);
 133                 if (IS_ERR(pdata))
 134                         return PTR_ERR(pdata);
 135                 adev->dev.platform_data = pdata;
 136         }
 137
 138         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 139         if (!drvdata)
 140                 return -ENOMEM;
 141
 142         drvdata->dev = &adev->dev;
 143         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 144         if (!IS_ERR(drvdata->atclk)) {
 145                 ret = clk_prepare_enable(drvdata->atclk);
 146                 if (ret)
 147                         return ret;
 148         }
 149
 150         /* Validity for the resource is already checked by the AMBA core */
 151         base = devm_ioremap_resource(dev, res);
 152         if (IS_ERR(base))
 153                 return PTR_ERR(base);
 154
 155         drvdata->base = base;
 156         dev_set_drvdata(dev, drvdata);
 157         pm_runtime_put(&adev->dev);
 158
 159         desc.type = CORESIGHT_DEV_TYPE_LINK;
 160         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 161         desc.ops = &replicator_cs_ops;
 162         desc.pdata = adev->dev.platform_data;
 163         desc.dev = &adev->dev;
 164         desc.groups = replicator_groups;
 165         drvdata->csdev = coresight_register(&desc);
 166
 167         return PTR_ERR_OR_ZERO(drvdata->csdev);
 168 }
 169
 170 #ifdef CONFIG_PM
 171 static int replicator_runtime_suspend(struct device *dev)
 172 {
 173         struct replicator_state *drvdata = dev_get_drvdata(dev);
 174
 175         if (drvdata && !IS_ERR(drvdata->atclk))
 176                 clk_disable_unprepare(drvdata->atclk);
 177
 178         return 0;
 179 }
 180
 181 static int replicator_runtime_resume(struct device *dev)
 182 {
 183         struct replicator_state *drvdata = dev_get_drvdata(dev);
 184
 185         if (drvdata && !IS_ERR(drvdata->atclk))
 186                 clk_prepare_enable(drvdata->atclk);
 187
 188         return 0;
 189 }
 190 #endif
 191
 192 static const struct dev_pm_ops replicator_dev_pm_ops = {
 193         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 194                            replicator_runtime_resume,
 195                            NULL)
 196 };
 197
 198 static const struct amba_id replicator_ids[] = {
 199         {
 200                 .id     = 0x000bb909,
 201                 .mask   = 0x000fffff,
 202         },
 203         {
 204                 /* Coresight SoC-600 */
 205                 .id     = 0x000bb9ec,
 206                 .mask   = 0x000fffff,
 207         },
 208         { 0, 0 },
 209 };
 210
 211 static struct amba_driver replicator_driver = {
 212         .drv = {
 213                 .name   = "coresight-dynamic-replicator",
 214                 .pm     = &replicator_dev_pm_ops,
 215                 .suppress_bind_attrs = true,
 216         },
 217         .probe          = replicator_probe,
 218         .id_table       = replicator_ids,
 219 };
 220 builtin_amba_driver(replicator_driver);