blob: 771321d1cdbed920d5a8d93ad939c6091d134889 [file] [log] [blame]
/* Copyright (c) 2011-2013, 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/types.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 funnel_writel(drvdata, val, off) \
__raw_writel((val), drvdata->base + off)
#define funnel_readl(drvdata, off) \
__raw_readl(drvdata->base + off)
#define FUNNEL_LOCK(drvdata) \
do { \
mb(); \
funnel_writel(drvdata, 0x0, CORESIGHT_LAR); \
} while (0)
#define FUNNEL_UNLOCK(drvdata) \
do { \
funnel_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \
mb(); \
} while (0)
#define FUNNEL_FUNCTL (0x000)
#define FUNNEL_PRICTL (0x004)
#define FUNNEL_ITATBDATA0 (0xEEC)
#define FUNNEL_ITATBCTR2 (0xEF0)
#define FUNNEL_ITATBCTR1 (0xEF4)
#define FUNNEL_ITATBCTR0 (0xEF8)
#define FUNNEL_HOLDTIME_MASK (0xF00)
#define FUNNEL_HOLDTIME_SHFT (0x8)
#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
struct funnel_drvdata {
void __iomem *base;
struct device *dev;
struct coresight_device *csdev;
struct clk *clk;
uint32_t priority;
};
static void __funnel_enable(struct funnel_drvdata *drvdata, int port)
{
uint32_t functl;
FUNNEL_UNLOCK(drvdata);
functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
functl &= ~FUNNEL_HOLDTIME_MASK;
functl |= FUNNEL_HOLDTIME;
functl |= (1 << port);
funnel_writel(drvdata, functl, FUNNEL_FUNCTL);
funnel_writel(drvdata, drvdata->priority, FUNNEL_PRICTL);
FUNNEL_LOCK(drvdata);
}
static int funnel_enable(struct coresight_device *csdev, int inport,
int outport)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
int ret;
ret = clk_prepare_enable(drvdata->clk);
if (ret)
return ret;
__funnel_enable(drvdata, inport);
dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
return 0;
}
static void __funnel_disable(struct funnel_drvdata *drvdata, int inport)
{
uint32_t functl;
FUNNEL_UNLOCK(drvdata);
functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
functl &= ~(1 << inport);
funnel_writel(drvdata, functl, FUNNEL_FUNCTL);
FUNNEL_LOCK(drvdata);
}
static void funnel_disable(struct coresight_device *csdev, int inport,
int outport)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
__funnel_disable(drvdata, inport);
clk_disable_unprepare(drvdata->clk);
dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
}
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 funnel_show_priority(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val = drvdata->priority;
return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static ssize_t funnel_store_priority(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val;
if (sscanf(buf, "%lx", &val) != 1)
return -EINVAL;
drvdata->priority = val;
return size;
}
static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, funnel_show_priority,
funnel_store_priority);
static struct attribute *funnel_attrs[] = {
&dev_attr_priority.attr,
NULL,
};
static struct attribute_group funnel_attr_grp = {
.attrs = funnel_attrs,
};
static const struct attribute_group *funnel_attr_grps[] = {
&funnel_attr_grp,
NULL,
};
static int __devinit funnel_probe(struct platform_device *pdev)
{
int ret;
struct device *dev = &pdev->dev;
struct coresight_platform_data *pdata;
struct funnel_drvdata *drvdata;
struct resource *res;
struct coresight_desc *desc;
if (coresight_fuse_access_disabled())
return -EPERM;
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_byname(pdev, IORESOURCE_MEM, "funnel-base");
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.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
desc->ops = &funnel_cs_ops;
desc->pdata = pdev->dev.platform_data;
desc->dev = &pdev->dev;
desc->groups = funnel_attr_grps;
desc->owner = THIS_MODULE;
drvdata->csdev = coresight_register(desc);
if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);
dev_info(dev, "FUNNEL initialized\n");
return 0;
}
static int __devexit funnel_remove(struct platform_device *pdev)
{
struct funnel_drvdata *drvdata = platform_get_drvdata(pdev);
coresight_unregister(drvdata->csdev);
return 0;
}
static struct of_device_id funnel_match[] = {
{.compatible = "arm,coresight-funnel"},
{}
};
static struct platform_driver funnel_driver = {
.probe = funnel_probe,
.remove = __devexit_p(funnel_remove),
.driver = {
.name = "coresight-funnel",
.owner = THIS_MODULE,
.of_match_table = funnel_match,
},
};
static int __init funnel_init(void)
{
return platform_driver_register(&funnel_driver);
}
module_init(funnel_init);
static void __exit funnel_exit(void)
{
platform_driver_unregister(&funnel_driver);
}
module_exit(funnel_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Funnel driver");