// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*
* Description: CoreSight Funnel driver
*/
#include <linux/acpi.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/coresight.h>
#include <linux/amba/bus.h>
#include <linux/clk.h>
#include "coresight-priv.h"
#define FUNNEL_FUNCTL 0x000
#define FUNNEL_PRICTL 0x004
#define FUNNEL_HOLDTIME_MASK 0xf00
#define FUNNEL_HOLDTIME_SHFT 0x8
#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
#define FUNNEL_ENSx_MASK 0xff
DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
/**
* struct funnel_drvdata - specifics associated to a funnel component
* @base: memory mapped base address for this component.
* @atclk: optional clock for the core parts of the funnel.
* @pclk: APB clock if present, otherwise NULL
* @csdev: component vitals needed by the framework.
* @priority: port selection order.
* @spinlock: serialize enable/disable operations.
*/
struct funnel_drvdata {
void __iomem *base;
struct clk *atclk;
struct clk *pclk;
struct coresight_device *csdev;
unsigned long priority;
spinlock_t spinlock;
};
static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
{
u32 functl;
int rc = 0;
struct coresight_device *csdev = drvdata->csdev;
CS_UNLOCK(drvdata->base);
functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
/* Claim the device only when we enable the first slave */
if (!(functl & FUNNEL_ENSx_MASK)) {
rc = coresight_claim_device_unlocked(csdev);
if (rc)
goto done;
}
functl &= ~FUNNEL_HOLDTIME_MASK;
functl |= FUNNEL_HOLDTIME;
functl |= (1 << port);
writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
done:
CS_LOCK(drvdata->base);
return rc;
}
static int funnel_enable(struct coresight_device *csdev,
struct coresight_connection *in,
struct coresight_connection *out)
{
int rc = 0;
struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
unsigned long flags;
bool first_enable = false;
spin_lock_irqsave(&drvdata->spinlock, flags);
if (atomic_read(&in->dest_refcnt) == 0) {
if (drvdata->base)
rc = dynamic_funnel_enable_hw(drvdata, in->dest_port);
if (!rc)
first_enable = true;
}
if (!rc)
atomic_inc(&in->dest_refcnt);
spin_unlock_irqrestore(&drvdata->spinlock, flags);
if (first_enable)
dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n",
in->dest_port);
return rc;
}
static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
int inport)
{
u32 functl;
struct coresight_device *csdev = drvdata->csdev;
CS_UNLOCK(drvdata->base);
functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
functl &= ~(1 << inport);
writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
/* Disclaim the device if none of the slaves are now active */
if (!(functl & FUNNEL_ENSx_MASK))
coresight_disclaim_device_unlocked(csdev);
CS_LOCK(drvdata->base);
}
static void funnel_disable(struct coresight_device *csdev,
struct coresight_connection *in,
struct coresight_connection *out)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
unsigned long flags;
bool last_disable = false;
spin_lock_irqsave(&drvdata->spinlock, flags);
if (atomic_dec_return(&in->dest_refcnt) == 0) {
if (drvdata->base)
dynamic_funnel_disable_hw(drvdata, in->dest_port);
last_disable = true;
}
spin_unlock_irqrestore(&drvdata->spinlock, flags);
if (last_disable)
dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n",
in->dest_port);
}
static const struct coresight_ops_link funnel_link_ops = {
.enable = funnel_enable,
.disable = funnel_disable,
};
static const struct coresight_ops funnel_cs_ops = {
.link_ops = &funnel_link_ops,
};
static ssize_t priority_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val = drvdata->priority;
return sprintf(buf, "%#lx\n", val);
}
static ssize_t priority_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
int ret;
unsigned long val;
struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
ret = kstrtoul(buf, 16, &val);
if (ret)
return ret;
drvdata->priority = val;
return size;
}
static DEVICE_ATTR_RW(priority);
static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
{
u32 functl;
CS_UNLOCK(drvdata->base);
functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
CS_LOCK(drvdata->base);
return functl;
}
static ssize_t funnel_ctrl_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
u32 val;
struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
pm_runtime_get_sync(dev->parent);
val = get_funnel_ctrl_hw(drvdata);
pm_runtime_put(dev->parent);
return sprintf(buf, "%#x\n", val);
}
static DEVICE_ATTR_RO(funnel_ctrl);
static struct attribute *coresight_funnel_attrs[] = {
&dev_attr_funnel_ctrl.attr,
&dev_attr_priority.attr,
NULL,
};
ATTRIBUTE_GROUPS(coresight_funnel);
static int funnel_probe(struct device *dev, struct resource *res)
{
int ret;
void __iomem *base;
struct coresight_platform_data *pdata = NULL;
struct funnel_drvdata *drvdata;
struct coresight_desc desc = { 0 };
if (is_of_node(dev_fwnode(dev)) &&
of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
dev_warn_once(dev, "Uses OBSOLETE CoreSight funnel binding\n");
desc.name = coresight_alloc_device_name(&funnel_devs, dev);
if (!desc.name)
return -ENOMEM;
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);
if (ret)
return ret;
}
drvdata->pclk = coresight_get_enable_apb_pclk(dev);
if (IS_ERR(drvdata->pclk))
return -ENODEV;
/*
* Map the device base for dynamic-funnel, which has been
* validated by AMBA core.
*/
if (res) {
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base)) {
ret = PTR_ERR(base);
goto out_disable_clk;
}
drvdata->base = base;
desc.groups = coresight_funnel_groups;
desc.access = CSDEV_ACCESS_IOMEM(base);
}
dev_set_drvdata(dev, drvdata);
pdata = coresight_get_platform_data(dev);
if (IS_ERR(pdata)) {
ret = PTR_ERR(pdata);
goto out_disable_clk;
}
dev->platform_data = pdata;
spin_lock_init(&drvdata->spinlock);
desc.type = CORESIGHT_DEV_TYPE_LINK;
desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
desc.ops = &funnel_cs_ops;
desc.pdata = pdata;
desc.dev = dev;
drvdata->csdev = coresight_register(&desc);
if (IS_ERR(drvdata->csdev)) {
ret = PTR_ERR(drvdata->csdev);
goto out_disable_clk;
}
ret = 0;
out_disable_clk:
if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);
if (ret && !IS_ERR_OR_NULL(drvdata->pclk))
clk_disable_unprepare(drvdata->pclk);
return ret;
}
static int funnel_remove(struct device *dev)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
coresight_unregister(drvdata->csdev);
return 0;
}
#ifdef CONFIG_PM
static int funnel_runtime_suspend(struct device *dev)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata && !IS_ERR(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);
if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
clk_disable_unprepare(drvdata->pclk);
return 0;
}
static int funnel_runtime_resume(struct device *dev)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata && !IS_ERR(drvdata->atclk))
clk_prepare_enable(drvdata->atclk);
if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
clk_prepare_enable(drvdata->pclk);
return 0;
}
#endif
static const struct dev_pm_ops funnel_dev_pm_ops = {
SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
};
static int funnel_platform_probe(struct platform_device *pdev)
{
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int ret;
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = funnel_probe(&pdev->dev, res);
pm_runtime_put(&pdev->dev);
if (ret)
pm_runtime_disable(&pdev->dev);
return ret;
}
static void funnel_platform_remove(struct platform_device *pdev)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
if (WARN_ON(!drvdata))
return;
funnel_remove(&pdev->dev);
pm_runtime_disable(&pdev->dev);
if (!IS_ERR_OR_NULL(drvdata->pclk))
clk_put(drvdata->pclk);
}
static const struct of_device_id funnel_match[] = {
{.compatible = "arm,coresight-static-funnel"},
{}
};
MODULE_DEVICE_TABLE(of, funnel_match);
#ifdef CONFIG_ACPI
static const struct acpi_device_id funnel_acpi_ids[] = {
{"ARMHC9FE", 0, 0, 0}, /* ARM Coresight Static Funnel */
{"ARMHC9FF", 0, 0, 0}, /* ARM CoreSight Dynamic Funnel */
{},
};
MODULE_DEVICE_TABLE(acpi, funnel_acpi_ids);
#endif
static struct platform_driver funnel_driver = {
.probe = funnel_platform_probe,
.remove_new = funnel_platform_remove,
.driver = {
.name = "coresight-funnel",
/* THIS_MODULE is taken care of by platform_driver_register() */
.of_match_table = funnel_match,
.acpi_match_table = ACPI_PTR(funnel_acpi_ids),
.pm = &funnel_dev_pm_ops,
.suppress_bind_attrs = true,
},
};
static int dynamic_funnel_probe(struct amba_device *adev,
const struct amba_id *id)
{
int ret;
ret = funnel_probe(&adev->dev, &adev->res);
if (!ret)
pm_runtime_put(&adev->dev);
return ret;
}
static void dynamic_funnel_remove(struct amba_device *adev)
{
funnel_remove(&adev->dev);
}
static const struct amba_id dynamic_funnel_ids[] = {
{
.id = 0x000bb908,
.mask = 0x000fffff,
},
{
/* Coresight SoC-600 */
.id = 0x000bb9eb,
.mask = 0x000fffff,
},
{ 0, 0, NULL },
};
MODULE_DEVICE_TABLE(amba, dynamic_funnel_ids);
static struct amba_driver dynamic_funnel_driver = {
.drv = {
.name = "coresight-dynamic-funnel",
.pm = &funnel_dev_pm_ops,
.suppress_bind_attrs = true,
},
.probe = dynamic_funnel_probe,
.remove = dynamic_funnel_remove,
.id_table = dynamic_funnel_ids,
};
static int __init funnel_init(void)
{
return coresight_init_driver("funnel", &dynamic_funnel_driver, &funnel_driver);
}
static void __exit funnel_exit(void)
{
coresight_remove_driver(&dynamic_funnel_driver, &funnel_driver);
}
module_init(funnel_init);
module_exit(funnel_exit);
MODULE_AUTHOR("Pratik Patel <[email protected]>");
MODULE_AUTHOR("Mathieu Poirier <[email protected]>");
MODULE_DESCRIPTION("Arm CoreSight Funnel Driver");
MODULE_LICENSE("GPL v2");
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