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/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/coresight.h>
#include "coresight-priv.h"
/**
* struct replicator_drvdata - specifics associated to a replicator component
* @dev: the device entity associated with this component
* @atclk: optional clock for the core parts of the replicator.
* @csdev: component vitals needed by the framework
*/
struct replicator_drvdata {
struct device *dev;
struct clk *atclk;
struct coresight_device *csdev;
};
static int replicator_enable(struct coresight_device *csdev, int inport,
int outport)
{
struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
pm_runtime_get_sync(drvdata->dev);
dev_info(drvdata->dev, "REPLICATOR enabled\n");
return 0;
}
static void replicator_disable(struct coresight_device *csdev, int inport,
int outport)
{
struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
pm_runtime_put(drvdata->dev);
dev_info(drvdata->dev, "REPLICATOR disabled\n");
}
static const struct coresight_ops_link replicator_link_ops = {
.enable = replicator_enable,
.disable = replicator_disable,
};
static const struct coresight_ops replicator_cs_ops = {
.link_ops = &replicator_link_ops,
};
static int replicator_probe(struct platform_device *pdev)
{
int ret;
struct device *dev = &pdev->dev;
struct coresight_platform_data *pdata = NULL;
struct replicator_drvdata *drvdata;
struct coresight_desc *desc;
struct device_node *np = pdev->dev.of_node;
if (np) {
pdata = of_get_coresight_platform_data(dev, np);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
pdev->dev.platform_data = pdata;
}
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->dev = &pdev->dev;
drvdata->atclk = devm_clk_get(&pdev->dev, "atclk"); /* optional */
if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);
if (ret)
return ret;
}
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
platform_set_drvdata(pdev, drvdata);
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc) {
ret = -ENOMEM;
goto out_disable_pm;
}
desc->type = CORESIGHT_DEV_TYPE_LINK;
desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
desc->ops = &replicator_cs_ops;
desc->pdata = pdev->dev.platform_data;
desc->dev = &pdev->dev;
drvdata->csdev = coresight_register(desc);
if (IS_ERR(drvdata->csdev)) {
ret = PTR_ERR(drvdata->csdev);
goto out_disable_pm;
}
pm_runtime_put(&pdev->dev);
dev_info(dev, "REPLICATOR initialized\n");
return 0;
out_disable_pm:
if (!IS_ERR(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return ret;
}
static int replicator_remove(struct platform_device *pdev)
{
struct replicator_drvdata *drvdata = platform_get_drvdata(pdev);
coresight_unregister(drvdata->csdev);
pm_runtime_get_sync(&pdev->dev);
if (!IS_ERR(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
#ifdef CONFIG_PM
static int replicator_runtime_suspend(struct device *dev)
{
struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata && !IS_ERR(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);
return 0;
}
static int replicator_runtime_resume(struct device *dev)
{
struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata && !IS_ERR(drvdata->atclk))
clk_prepare_enable(drvdata->atclk);
return 0;
}
#endif
static const struct dev_pm_ops replicator_dev_pm_ops = {
SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
replicator_runtime_resume, NULL)
};
static const struct of_device_id replicator_match[] = {
{.compatible = "arm,coresight-replicator"},
{}
};
static struct platform_driver replicator_driver = {
.probe = replicator_probe,
.remove = replicator_remove,
.driver = {
.name = "coresight-replicator",
.of_match_table = replicator_match,
.pm = &replicator_dev_pm_ops,
},
};
static int __init replicator_init(void)
{
return platform_driver_register(&replicator_driver);
}
module_init(replicator_init);
static void __exit replicator_exit(void)
{
platform_driver_unregister(&replicator_driver);
}
module_exit(replicator_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Replicator driver");
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