blob: 7af5c6c8bdeaa1bb9f9fbd3d524aa39acbc0984e [file] [log] [blame]
/* Copyright (c) 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/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_coresight.h>
#include <linux/coresight.h>
#include "coresight-priv.h"
#define fuse_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off)
#define fuse_readl(drvdata, off) __raw_readl(drvdata->base + off)
#define OEM_CONFIG0 (0x000)
#define OEM_CONFIG1 (0x004)
#define ALL_DEBUG_DISABLE BIT(21)
#define APPS_DBGEN_DISABLE BIT(0)
#define APPS_NIDEN_DISABLE BIT(1)
#define APPS_SPIDEN_DISABLE BIT(2)
#define APPS_SPNIDEN_DISABLE BIT(3)
#define DAP_DBGEN_DISABLE BIT(4)
#define DAP_NIDEN_DISABLE BIT(5)
#define DAP_SPIDEN_DISABLE BIT(6)
#define DAP_SPNIDEN_DISABLE BIT(7)
#define DAP_DEVICEEN_DISABLE BIT(8)
struct fuse_drvdata {
void __iomem *base;
struct device *dev;
struct coresight_device *csdev;
};
static struct fuse_drvdata *fusedrvdata;
bool coresight_fuse_access_disabled(void)
{
struct fuse_drvdata *drvdata = fusedrvdata;
uint32_t config0, config1;
bool ret;
config0 = fuse_readl(drvdata, OEM_CONFIG0);
config1 = fuse_readl(drvdata, OEM_CONFIG1);
dev_dbg(drvdata->dev, "config0: %lx\n", (unsigned long)config0);
dev_dbg(drvdata->dev, "config1: %lx\n", (unsigned long)config1);
if (config0 & ALL_DEBUG_DISABLE)
ret = true;
else if (config1 & DAP_DBGEN_DISABLE)
ret = true;
else if (config1 & DAP_NIDEN_DISABLE)
ret = true;
else if (config1 & DAP_SPIDEN_DISABLE)
ret = true;
else if (config1 & DAP_SPNIDEN_DISABLE)
ret = true;
else if (config1 & DAP_DEVICEEN_DISABLE)
ret = true;
else
ret = false;
if (ret)
dev_dbg(drvdata->dev, "coresight fuse disabled\n");
return ret;
}
EXPORT_SYMBOL(coresight_fuse_access_disabled);
bool coresight_fuse_apps_access_disabled(void)
{
struct fuse_drvdata *drvdata = fusedrvdata;
uint32_t config0, config1;
bool ret;
config0 = fuse_readl(drvdata, OEM_CONFIG0);
config1 = fuse_readl(drvdata, OEM_CONFIG1);
dev_dbg(drvdata->dev, "apps config0: %lx\n", (unsigned long)config0);
dev_dbg(drvdata->dev, "apps config1: %lx\n", (unsigned long)config1);
if (config0 & ALL_DEBUG_DISABLE)
ret = true;
else if (config1 & APPS_DBGEN_DISABLE)
ret = true;
else if (config1 & APPS_NIDEN_DISABLE)
ret = true;
else if (config1 & APPS_SPIDEN_DISABLE)
ret = true;
else if (config1 & APPS_SPNIDEN_DISABLE)
ret = true;
else if (config1 & DAP_DEVICEEN_DISABLE)
ret = true;
else
ret = false;
if (ret)
dev_dbg(drvdata->dev, "apps fuse disabled\n");
return ret;
}
EXPORT_SYMBOL(coresight_fuse_apps_access_disabled);
static int __devinit fuse_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct coresight_platform_data *pdata;
struct fuse_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;
/* Store the driver data pointer for use in exported functions */
fusedrvdata = drvdata;
drvdata->dev = &pdev->dev;
platform_set_drvdata(pdev, drvdata);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fuse-base");
if (!res)
return -ENODEV;
drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
if (!drvdata->base)
return -ENOMEM;
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
desc->type = CORESIGHT_DEV_TYPE_NONE;
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, "Fuse initialized\n");
return 0;
}
static int __devexit fuse_remove(struct platform_device *pdev)
{
struct fuse_drvdata *drvdata = platform_get_drvdata(pdev);
coresight_unregister(drvdata->csdev);
return 0;
}
static struct of_device_id fuse_match[] = {
{.compatible = "arm,coresight-fuse"},
{}
};
static struct platform_driver fuse_driver = {
.probe = fuse_probe,
.remove = __devexit_p(fuse_remove),
.driver = {
.name = "coresight-fuse",
.owner = THIS_MODULE,
.of_match_table = fuse_match,
},
};
static int __init fuse_init(void)
{
return platform_driver_register(&fuse_driver);
}
module_init(fuse_init);
static void __exit fuse_exit(void)
{
platform_driver_unregister(&fuse_driver);
}
module_exit(fuse_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Fuse driver");