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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/clk.h>
#include <linux/of_coresight.h>
#include <linux/coresight.h>
#include "coresight-priv.h"
#define replicator_writel(drvdata, val, off) \
__raw_writel((val), drvdata->base + off)
#define replicator_readl(drvdata, off) \
__raw_readl(drvdata->base + off)
#define REPLICATOR_LOCK(drvdata) \
do { \
mb(); \
replicator_writel(drvdata, 0x0, CORESIGHT_LAR); \
} while (0)
#define REPLICATOR_UNLOCK(drvdata) \
do { \
replicator_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \
mb(); \
} while (0)
#define REPLICATOR_IDFILTER0 (0x000)
#define REPLICATOR_IDFILTER1 (0x004)
#define REPLICATOR_ITATBCTR0 (0xEFC)
#define REPLICATOR_ITATBCTR1 (0xEF8)
struct replicator_drvdata {
void __iomem *base;
struct device *dev;
struct coresight_device *csdev;
struct clk *clk;
};
static void __replicator_enable(struct replicator_drvdata *drvdata, int outport)
{
REPLICATOR_UNLOCK(drvdata);
if (outport == 0) {
replicator_writel(drvdata, 0x0, REPLICATOR_IDFILTER0);
replicator_writel(drvdata, 0xFF, REPLICATOR_IDFILTER1);
} else {
replicator_writel(drvdata, 0x0, REPLICATOR_IDFILTER1);
replicator_writel(drvdata, 0xFF, REPLICATOR_IDFILTER0);
}
REPLICATOR_LOCK(drvdata);
}
static int replicator_enable(struct coresight_device *csdev, int inport,
int outport)
{
struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
int ret;
ret = clk_prepare_enable(drvdata->clk);
if (ret)
return ret;
__replicator_enable(drvdata, outport);
dev_info(drvdata->dev, "REPLICATOR enabled\n");
return 0;
}
static void __replicator_disable(struct replicator_drvdata *drvdata,
int outport)
{
REPLICATOR_UNLOCK(drvdata);
if (outport == 0)
replicator_writel(drvdata, 0xFF, REPLICATOR_IDFILTER0);
else
replicator_writel(drvdata, 0xFF, REPLICATOR_IDFILTER1);
REPLICATOR_LOCK(drvdata);
}
static void replicator_disable(struct coresight_device *csdev, int inport,
int outport)
{
struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
__replicator_disable(drvdata, outport);
clk_disable_unprepare(drvdata->clk);
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 __devinit replicator_probe(struct platform_device *pdev)
{
int ret;
struct device *dev = &pdev->dev;
struct coresight_platform_data *pdata;
struct replicator_drvdata *drvdata;
struct resource *res;
struct coresight_desc *desc;
if (pdev->dev.of_node) {
pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
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;
platform_set_drvdata(pdev, drvdata);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
if (!drvdata->base)
return -ENOMEM;
drvdata->clk = devm_clk_get(dev, "core_clk");
if (IS_ERR(drvdata->clk))
return PTR_ERR(drvdata->clk);
ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
if (ret)
return ret;
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
desc->type = CORESIGHT_DEV_TYPE_LINK;
desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
desc->ops = &replicator_cs_ops;
desc->pdata = pdev->dev.platform_data;
desc->dev = &pdev->dev;
desc->owner = THIS_MODULE;
drvdata->csdev = coresight_register(desc);
if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);
dev_info(dev, "REPLICATOR initialized\n");
return 0;
}
static int __devexit replicator_remove(struct platform_device *pdev)
{
struct replicator_drvdata *drvdata = platform_get_drvdata(pdev);
coresight_unregister(drvdata->csdev);
return 0;
}
static struct of_device_id replicator_match[] = {
{.compatible = "qcom,coresight-replicator"},
{}
};
static struct platform_driver replicator_driver = {
.probe = replicator_probe,
.remove = __devexit_p(replicator_remove),
.driver = {
.name = "coresight-replicator",
.owner = THIS_MODULE,
.of_match_table = replicator_match,
},
};
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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