drivers/hwtracing/coresight/coresight-replicator.c

   1 /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19 #include <linux/err.h>
  20 #include <linux/slab.h>
  21 #include <linux/clk.h>
  22 #include <linux/of.h>
  23 #include <linux/coresight.h>
  24
  25 #include "coresight-priv.h"
  26
  27 /**
  28  * struct replicator_drvdata - specifics associated to a replicator component
  29  * @dev:        the device entity associated with this component
  30  * @csdev:      component vitals needed by the framework
  31  */
  32 struct replicator_drvdata {
  33         struct device           *dev;
  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_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  41
  42         dev_info(drvdata->dev, "REPLICATOR enabled\n");
  43         return 0;
  44 }
  45
  46 static void replicator_disable(struct coresight_device *csdev, int inport,
  47                                int outport)
  48 {
  49         struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  50
  51         dev_info(drvdata->dev, "REPLICATOR disabled\n");
  52 }
  53
  54 static const struct coresight_ops_link replicator_link_ops = {
  55         .enable         = replicator_enable,
  56         .disable        = replicator_disable,
  57 };
  58
  59 static const struct coresight_ops replicator_cs_ops = {
  60         .link_ops       = &replicator_link_ops,
  61 };
  62
  63 static int replicator_probe(struct platform_device *pdev)
  64 {
  65         struct device *dev = &pdev->dev;
  66         struct coresight_platform_data *pdata = NULL;
  67         struct replicator_drvdata *drvdata;
  68         struct coresight_desc *desc;
  69         struct device_node *np = pdev->dev.of_node;
  70
  71         if (np) {
  72                 pdata = of_get_coresight_platform_data(dev, np);
  73                 if (IS_ERR(pdata))
  74                         return PTR_ERR(pdata);
  75                 pdev->dev.platform_data = pdata;
  76         }
  77
  78         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
  79         if (!drvdata)
  80                 return -ENOMEM;
  81
  82         drvdata->dev = &pdev->dev;
  83         platform_set_drvdata(pdev, drvdata);
  84
  85         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
  86         if (!desc)
  87                 return -ENOMEM;
  88
  89         desc->type = CORESIGHT_DEV_TYPE_LINK;
  90         desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
  91         desc->ops = &replicator_cs_ops;
  92         desc->pdata = pdev->dev.platform_data;
  93         desc->dev = &pdev->dev;
  94         drvdata->csdev = coresight_register(desc);
  95         if (IS_ERR(drvdata->csdev))
  96                 return PTR_ERR(drvdata->csdev);
  97
  98         dev_info(dev, "REPLICATOR initialized\n");
  99         return 0;
 100 }
 101
 102 static int replicator_remove(struct platform_device *pdev)
 103 {
 104         struct replicator_drvdata *drvdata = platform_get_drvdata(pdev);
 105
 106         coresight_unregister(drvdata->csdev);
 107         return 0;
 108 }
 109
 110 static const struct of_device_id replicator_match[] = {
 111         {.compatible = "arm,coresight-replicator"},
 112         {}
 113 };
 114
 115 static struct platform_driver replicator_driver = {
 116         .probe          = replicator_probe,
 117         .remove         = replicator_remove,
 118         .driver         = {
 119                 .name   = "coresight-replicator",
 120                 .of_match_table = replicator_match,
 121         },
 122 };
 123
 124 static int __init replicator_init(void)
 125 {
 126         return platform_driver_register(&replicator_driver);
 127 }
 128 module_init(replicator_init);
 129
 130 static void __exit replicator_exit(void)
 131 {
 132         platform_driver_unregister(&replicator_driver);
 133 }
 134 module_exit(replicator_exit);
 135
 136 MODULE_LICENSE("GPL v2");
 137 MODULE_DESCRIPTION("CoreSight Replicator driver");