drivers/hwtracing/coresight/coresight-replicator-qcom.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/module.h>
  19 #include <linux/err.h>
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22 #include <linux/kernel.h>
  23 #include <linux/of.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/slab.h>
  26
  27 #include "coresight-priv.h"
  28
  29 #define REPLICATOR_IDFILTER0            0x000
  30 #define REPLICATOR_IDFILTER1            0x004
  31
  32 /**
  33  * struct replicator_state - specifics associated to a replicator component
  34  * @base:       memory mapped base address for this component.
  35  * @dev:        the device entity associated with this component
  36  * @atclk:      optional clock for the core parts of the replicator.
  37  * @csdev:      component vitals needed by the framework
  38  */
  39 struct replicator_state {
  40         void __iomem            *base;
  41         struct device           *dev;
  42         struct clk              *atclk;
  43         struct coresight_device *csdev;
  44 };
  45
  46 static int replicator_enable(struct coresight_device *csdev, int inport,
  47                               int outport)
  48 {
  49         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  50
  51         CS_UNLOCK(drvdata->base);
  52
  53         /*
  54          * Ensure that the other port is disabled
  55          * 0x00 - passing through the replicator unimpeded
  56          * 0xff - disable (or impede) the flow of ATB data
  57          */
  58         if (outport == 0) {
  59                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0);
  60                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  61         } else {
  62                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1);
  63                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  64         }
  65
  66         CS_LOCK(drvdata->base);
  67
  68         dev_info(drvdata->dev, "REPLICATOR enabled\n");
  69         return 0;
  70 }
  71
  72 static void replicator_disable(struct coresight_device *csdev, int inport,
  73                                 int outport)
  74 {
  75         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  76
  77         CS_UNLOCK(drvdata->base);
  78
  79         /* disable the flow of ATB data through port */
  80         if (outport == 0)
  81                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  82         else
  83                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  84
  85         CS_LOCK(drvdata->base);
  86
  87         dev_info(drvdata->dev, "REPLICATOR disabled\n");
  88 }
  89
  90 static const struct coresight_ops_link replicator_link_ops = {
  91         .enable         = replicator_enable,
  92         .disable        = replicator_disable,
  93 };
  94
  95 static const struct coresight_ops replicator_cs_ops = {
  96         .link_ops       = &replicator_link_ops,
  97 };
  98
  99 static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
 100 {
 101         int ret;
 102         struct device *dev = &adev->dev;
 103         struct resource *res = &adev->res;
 104         struct coresight_platform_data *pdata = NULL;
 105         struct replicator_state *drvdata;
 106         struct coresight_desc *desc;
 107         struct device_node *np = adev->dev.of_node;
 108         void __iomem *base;
 109
 110         if (np) {
 111                 pdata = of_get_coresight_platform_data(dev, np);
 112                 if (IS_ERR(pdata))
 113                         return PTR_ERR(pdata);
 114                 adev->dev.platform_data = pdata;
 115         }
 116
 117         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 118         if (!drvdata)
 119                 return -ENOMEM;
 120
 121         drvdata->dev = &adev->dev;
 122         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 123         if (!IS_ERR(drvdata->atclk)) {
 124                 ret = clk_prepare_enable(drvdata->atclk);
 125                 if (ret)
 126                         return ret;
 127         }
 128
 129         /* Validity for the resource is already checked by the AMBA core */
 130         base = devm_ioremap_resource(dev, res);
 131         if (IS_ERR(base))
 132                 return PTR_ERR(base);
 133
 134         drvdata->base = base;
 135         dev_set_drvdata(dev, drvdata);
 136         pm_runtime_put(&adev->dev);
 137
 138         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 139         if (!desc)
 140                 return -ENOMEM;
 141
 142         desc->type = CORESIGHT_DEV_TYPE_LINK;
 143         desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 144         desc->ops = &replicator_cs_ops;
 145         desc->pdata = adev->dev.platform_data;
 146         desc->dev = &adev->dev;
 147         drvdata->csdev = coresight_register(desc);
 148         if (IS_ERR(drvdata->csdev))
 149                 return PTR_ERR(drvdata->csdev);
 150
 151         dev_info(dev, "%s initialized\n", (char *)id->data);
 152         return 0;
 153 }
 154
 155 #ifdef CONFIG_PM
 156 static int replicator_runtime_suspend(struct device *dev)
 157 {
 158         struct replicator_state *drvdata = dev_get_drvdata(dev);
 159
 160         if (drvdata && !IS_ERR(drvdata->atclk))
 161                 clk_disable_unprepare(drvdata->atclk);
 162
 163         return 0;
 164 }
 165
 166 static int replicator_runtime_resume(struct device *dev)
 167 {
 168         struct replicator_state *drvdata = dev_get_drvdata(dev);
 169
 170         if (drvdata && !IS_ERR(drvdata->atclk))
 171                 clk_prepare_enable(drvdata->atclk);
 172
 173         return 0;
 174 }
 175 #endif
 176
 177 static const struct dev_pm_ops replicator_dev_pm_ops = {
 178         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 179                            replicator_runtime_resume,
 180                            NULL)
 181 };
 182
 183 static struct amba_id replicator_ids[] = {
 184         {
 185                 .id     = 0x0003b909,
 186                 .mask   = 0x0003ffff,
 187                 .data   = "REPLICATOR 1.0",
 188         },
 189         { 0, 0 },
 190 };
 191
 192 static struct amba_driver replicator_driver = {
 193         .drv = {
 194                 .name   = "coresight-replicator-qcom",
 195                 .pm     = &replicator_dev_pm_ops,
 196                 .suppress_bind_attrs = true,
 197         },
 198         .probe          = replicator_probe,
 199         .id_table       = replicator_ids,
 200 };
 201
 202 module_amba_driver(replicator_driver);