157 lines
3.8 KiB
C
157 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
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*
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* Description: CoreSight Replicator driver
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/coresight.h>
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#include "coresight-priv.h"
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/**
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* struct replicator_drvdata - specifics associated to a replicator component
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* @dev: the device entity associated with this component
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* @atclk: optional clock for the core parts of the replicator.
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* @csdev: component vitals needed by the framework
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*/
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struct replicator_drvdata {
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struct device *dev;
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struct clk *atclk;
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struct coresight_device *csdev;
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};
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static int replicator_enable(struct coresight_device *csdev, int inport,
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int outport)
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{
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struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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dev_dbg(drvdata->dev, "REPLICATOR enabled\n");
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return 0;
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}
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static void replicator_disable(struct coresight_device *csdev, int inport,
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int outport)
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{
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struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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dev_dbg(drvdata->dev, "REPLICATOR disabled\n");
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}
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static const struct coresight_ops_link replicator_link_ops = {
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.enable = replicator_enable,
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.disable = replicator_disable,
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};
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static const struct coresight_ops replicator_cs_ops = {
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.link_ops = &replicator_link_ops,
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};
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static int replicator_probe(struct platform_device *pdev)
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{
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int ret;
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struct device *dev = &pdev->dev;
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struct coresight_platform_data *pdata = NULL;
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struct replicator_drvdata *drvdata;
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struct coresight_desc desc = { 0 };
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struct device_node *np = pdev->dev.of_node;
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if (np) {
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pdata = of_get_coresight_platform_data(dev, np);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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pdev->dev.platform_data = pdata;
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}
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drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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drvdata->dev = &pdev->dev;
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drvdata->atclk = devm_clk_get(&pdev->dev, "atclk"); /* optional */
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if (!IS_ERR(drvdata->atclk)) {
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ret = clk_prepare_enable(drvdata->atclk);
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if (ret)
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return ret;
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}
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pm_runtime_get_noresume(&pdev->dev);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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platform_set_drvdata(pdev, drvdata);
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desc.type = CORESIGHT_DEV_TYPE_LINK;
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desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
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desc.ops = &replicator_cs_ops;
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desc.pdata = pdev->dev.platform_data;
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desc.dev = &pdev->dev;
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drvdata->csdev = coresight_register(&desc);
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if (IS_ERR(drvdata->csdev)) {
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ret = PTR_ERR(drvdata->csdev);
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goto out_disable_pm;
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}
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pm_runtime_put(&pdev->dev);
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return 0;
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out_disable_pm:
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if (!IS_ERR(drvdata->atclk))
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clk_disable_unprepare(drvdata->atclk);
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pm_runtime_put_noidle(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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return ret;
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}
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#ifdef CONFIG_PM
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static int replicator_runtime_suspend(struct device *dev)
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{
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struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
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if (drvdata && !IS_ERR(drvdata->atclk))
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clk_disable_unprepare(drvdata->atclk);
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return 0;
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}
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static int replicator_runtime_resume(struct device *dev)
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{
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struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
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if (drvdata && !IS_ERR(drvdata->atclk))
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clk_prepare_enable(drvdata->atclk);
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return 0;
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}
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#endif
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static const struct dev_pm_ops replicator_dev_pm_ops = {
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SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
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replicator_runtime_resume, NULL)
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};
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static const struct of_device_id replicator_match[] = {
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{.compatible = "arm,coresight-replicator"},
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{}
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};
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static struct platform_driver replicator_driver = {
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.probe = replicator_probe,
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.driver = {
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.name = "coresight-replicator",
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.of_match_table = replicator_match,
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.pm = &replicator_dev_pm_ops,
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.suppress_bind_attrs = true,
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},
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};
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builtin_platform_driver(replicator_driver);
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