LXR linux/drivers/hwtracing/coresight/coresight-replicator.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
   4 *
   5 * Description: CoreSight Replicator driver
   6 */
   7
   8#include <linux/kernel.h>
   9#include <linux/device.h>
  10#include <linux/platform_device.h>
  11#include <linux/io.h>
  12#include <linux/err.h>
  13#include <linux/slab.h>
  14#include <linux/pm_runtime.h>
  15#include <linux/clk.h>
  16#include <linux/of.h>
  17#include <linux/coresight.h>
  18
  19#include "coresight-priv.h"
  20
  21/**
  22 * struct replicator_drvdata - specifics associated to a replicator component
  23 * @dev:        the device entity associated with this component
  24 * @atclk:      optional clock for the core parts of the replicator.
  25 * @csdev:      component vitals needed by the framework
  26 */
  27struct replicator_drvdata {
  28        struct device           *dev;
  29        struct clk              *atclk;
  30        struct coresight_device *csdev;
  31};
  32
  33static int replicator_enable(struct coresight_device *csdev, int inport,
  34                             int outport)
  35{
  36        struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  37
  38        dev_info(drvdata->dev, "REPLICATOR enabled\n");
  39        return 0;
  40}
  41
  42static void replicator_disable(struct coresight_device *csdev, int inport,
  43                               int outport)
  44{
  45        struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  46
  47        dev_info(drvdata->dev, "REPLICATOR disabled\n");
  48}
  49
  50static const struct coresight_ops_link replicator_link_ops = {
  51        .enable         = replicator_enable,
  52        .disable        = replicator_disable,
  53};
  54
  55static const struct coresight_ops replicator_cs_ops = {
  56        .link_ops       = &replicator_link_ops,
  57};
  58
  59static int replicator_probe(struct platform_device *pdev)
  60{
  61        int ret;
  62        struct device *dev = &pdev->dev;
  63        struct coresight_platform_data *pdata = NULL;
  64        struct replicator_drvdata *drvdata;
  65        struct coresight_desc desc = { 0 };
  66        struct device_node *np = pdev->dev.of_node;
  67
  68        if (np) {
  69                pdata = of_get_coresight_platform_data(dev, np);
  70                if (IS_ERR(pdata))
  71                        return PTR_ERR(pdata);
  72                pdev->dev.platform_data = pdata;
  73        }
  74
  75        drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
  76        if (!drvdata)
  77                return -ENOMEM;
  78
  79        drvdata->dev = &pdev->dev;
  80        drvdata->atclk = devm_clk_get(&pdev->dev, "atclk"); /* optional */
  81        if (!IS_ERR(drvdata->atclk)) {
  82                ret = clk_prepare_enable(drvdata->atclk);
  83                if (ret)
  84                        return ret;
  85        }
  86        pm_runtime_get_noresume(&pdev->dev);
  87        pm_runtime_set_active(&pdev->dev);
  88        pm_runtime_enable(&pdev->dev);
  89        platform_set_drvdata(pdev, drvdata);
  90
  91        desc.type = CORESIGHT_DEV_TYPE_LINK;
  92        desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
  93        desc.ops = &replicator_cs_ops;
  94        desc.pdata = pdev->dev.platform_data;
  95        desc.dev = &pdev->dev;
  96        drvdata->csdev = coresight_register(&desc);
  97        if (IS_ERR(drvdata->csdev)) {
  98                ret = PTR_ERR(drvdata->csdev);
  99                goto out_disable_pm;
 100        }
 101
 102        pm_runtime_put(&pdev->dev);
 103
 104        return 0;
 105
 106out_disable_pm:
 107        if (!IS_ERR(drvdata->atclk))
 108                clk_disable_unprepare(drvdata->atclk);
 109        pm_runtime_put_noidle(&pdev->dev);
 110        pm_runtime_disable(&pdev->dev);
 111
 112        return ret;
 113}
 114
 115#ifdef CONFIG_PM
 116static int replicator_runtime_suspend(struct device *dev)
 117{
 118        struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
 119
 120        if (drvdata && !IS_ERR(drvdata->atclk))
 121                clk_disable_unprepare(drvdata->atclk);
 122
 123        return 0;
 124}
 125
 126static int replicator_runtime_resume(struct device *dev)
 127{
 128        struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
 129
 130        if (drvdata && !IS_ERR(drvdata->atclk))
 131                clk_prepare_enable(drvdata->atclk);
 132
 133        return 0;
 134}
 135#endif
 136
 137static const struct dev_pm_ops replicator_dev_pm_ops = {
 138        SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 139                           replicator_runtime_resume, NULL)
 140};
 141
 142static const struct of_device_id replicator_match[] = {
 143        {.compatible = "arm,coresight-replicator"},
 144        {}
 145};
 146
 147static struct platform_driver replicator_driver = {
 148        .probe          = replicator_probe,
 149        .driver         = {
 150                .name   = "coresight-replicator",
 151                .of_match_table = replicator_match,
 152                .pm     = &replicator_dev_pm_ops,
 153                .suppress_bind_attrs = true,
 154        },
 155};
 156builtin_platform_driver(replicator_driver);
 157