mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Suzuki K Poulose](/assets/img/avatar_default.png)
Use CLAIM protocol to make sure the device is available for use. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
255 lines
6 KiB
C
255 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
|
|
*/
|
|
|
|
#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;
|
|
};
|
|
|
|
/*
|
|
* replicator_reset : Reset the replicator configuration to sane values.
|
|
*/
|
|
static void replicator_reset(struct replicator_state *drvdata)
|
|
{
|
|
CS_UNLOCK(drvdata->base);
|
|
|
|
if (!coresight_claim_device_unlocked(drvdata->base)) {
|
|
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
|
|
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
|
|
coresight_disclaim_device_unlocked(drvdata->base);
|
|
}
|
|
|
|
CS_LOCK(drvdata->base);
|
|
}
|
|
|
|
static int replicator_enable(struct coresight_device *csdev, int inport,
|
|
int outport)
|
|
{
|
|
int rc = 0;
|
|
u32 reg;
|
|
struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
|
|
|
|
switch (outport) {
|
|
case 0:
|
|
reg = REPLICATOR_IDFILTER0;
|
|
break;
|
|
case 1:
|
|
reg = REPLICATOR_IDFILTER1;
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
CS_UNLOCK(drvdata->base);
|
|
|
|
if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
|
|
(readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
|
|
rc = coresight_claim_device_unlocked(drvdata->base);
|
|
|
|
/* Ensure that the outport is enabled. */
|
|
if (!rc) {
|
|
writel_relaxed(0x00, drvdata->base + reg);
|
|
dev_dbg(drvdata->dev, "REPLICATOR enabled\n");
|
|
}
|
|
|
|
CS_LOCK(drvdata->base);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void replicator_disable(struct coresight_device *csdev, int inport,
|
|
int outport)
|
|
{
|
|
u32 reg;
|
|
struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
|
|
|
|
switch (outport) {
|
|
case 0:
|
|
reg = REPLICATOR_IDFILTER0;
|
|
break;
|
|
case 1:
|
|
reg = REPLICATOR_IDFILTER1;
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
|
|
CS_UNLOCK(drvdata->base);
|
|
|
|
/* disable the flow of ATB data through port */
|
|
writel_relaxed(0xff, drvdata->base + reg);
|
|
|
|
if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
|
|
(readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
|
|
coresight_disclaim_device_unlocked(drvdata->base);
|
|
CS_LOCK(drvdata->base);
|
|
|
|
dev_dbg(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);
|
|
|
|
if (!IS_ERR(drvdata->csdev)) {
|
|
replicator_reset(drvdata);
|
|
return 0;
|
|
}
|
|
return PTR_ERR(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);
|