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/*
* Copyright (c) 2011-2015, 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/amba/bus.h>
#include <linux/clk.h>
#include <linux/coresight.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "coresight-priv.h"
#define REPLICATOR_IDFILTER0 0x000
#define REPLICATOR_IDFILTER1 0x004
/**
* struct replicator_state - specifics associated to a replicator component
* @base: memory mapped base address for this 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_state {
void __iomem *base;
struct device *dev;
struct clk *atclk;
struct coresight_device *csdev;
};
static int replicator_enable(struct coresight_device *csdev, int inport,
int outport)
{
struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
CS_UNLOCK(drvdata->base);
/*
* Ensure that the other port is disabled
* 0x00 - passing through the replicator unimpeded
* 0xff - disable (or impede) the flow of ATB data
*/
if (outport == 0) {
writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0);
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
} else {
writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1);
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
}
CS_LOCK(drvdata->base);
dev_info(drvdata->dev, "REPLICATOR enabled\n");
return 0;
}
static void replicator_disable(struct coresight_device *csdev, int inport,
int outport)
{
struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
CS_UNLOCK(drvdata->base);
/* disable the flow of ATB data through port */
if (outport == 0)
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
else
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
CS_LOCK(drvdata->base);
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,
};
#define coresight_replicator_reg(name, offset) \
coresight_simple_reg32(struct replicator_state, name, offset)
coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
static struct attribute *replicator_mgmt_attrs[] = {
&dev_attr_idfilter0.attr,
&dev_attr_idfilter1.attr,
NULL,
};
static const struct attribute_group replicator_mgmt_group = {
.attrs = replicator_mgmt_attrs,
.name = "mgmt",
};
static const struct attribute_group *replicator_groups[] = {
&replicator_mgmt_group,
NULL,
};
static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
{
int ret;
struct device *dev = &adev->dev;
struct resource *res = &adev->res;
struct coresight_platform_data *pdata = NULL;
struct replicator_state *drvdata;
struct coresight_desc desc = { 0 };
struct device_node *np = adev->dev.of_node;
void __iomem *base;
if (np) {
pdata = of_get_coresight_platform_data(dev, np);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
adev->dev.platform_data = pdata;
}
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->dev = &adev->dev;
drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);
if (ret)
return ret;
}
/* Validity for the resource is already checked by the AMBA core */
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
drvdata->base = base;
dev_set_drvdata(dev, drvdata);
pm_runtime_put(&adev->dev);
desc.type = CORESIGHT_DEV_TYPE_LINK;
desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
desc.ops = &replicator_cs_ops;
desc.pdata = adev->dev.platform_data;
desc.dev = &adev->dev;
desc.groups = replicator_groups;
drvdata->csdev = coresight_register(&desc);
return PTR_ERR_OR_ZERO(drvdata->csdev);
}
#ifdef CONFIG_PM
static int replicator_runtime_suspend(struct device *dev)
{
struct replicator_state *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_state *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 amba_id replicator_ids[] = {
{
.id = 0x000bb909,
.mask = 0x000fffff,
},
{
/* Coresight SoC-600 */
.id = 0x000bb9ec,
.mask = 0x000fffff,
},
{ 0, 0 },
};
static struct amba_driver replicator_driver = {
.drv = {
.name = "coresight-dynamic-replicator",
.pm = &replicator_dev_pm_ops,
.suppress_bind_attrs = true,
},
.probe = replicator_probe,
.id_table = replicator_ids,
};
builtin_amba_driver(replicator_driver);
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