M7350/kernel/drivers/coresight/coresight-fuse.c
2024-09-09 08:57:42 +00:00

407 lines
10 KiB
C

/* Copyright (c) 2013-2015, 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/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/of_device.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 OEM_CONFIG2 (0x008)
#define FEATURE_CONFIG2 (0x000)
#define CORESIGHT_FUSE_VERSION_V1 "arm,coresight-fuse"
#define CORESIGHT_FUSE_VERSION_V2 "arm,coresight-fuse-v2"
#define CORESIGHT_FUSE_VERSION_V3 "arm,coresight-fuse-v3"
/* CoreSight FUSE V1 */
#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)
/* CoreSight FUSE V2 */
#define ALL_DEBUG_DISABLE_V2 BIT(0)
#define APPS_DBGEN_DISABLE_V2 BIT(10)
#define APPS_NIDEN_DISABLE_V2 BIT(11)
#define APPS_SPIDEN_DISABLE_V2 BIT(12)
#define APPS_SPNIDEN_DISABLE_V2 BIT(13)
#define DAP_DBGEN_DISABLE_V2 BIT(14)
#define DAP_NIDEN_DISABLE_V2 BIT(15)
#define DAP_SPIDEN_DISABLE_V2 BIT(16)
#define DAP_SPNIDEN_DISABLE_V2 BIT(17)
#define DAP_DEVICEEN_DISABLE_V2 BIT(18)
/* CoreSight FUSE V3 */
#define ALL_DEBUG_DISABLE_V3 BIT(29)
#define APPS_DBGEN_DISABLE_V3 BIT(8)
#define APPS_NIDEN_DISABLE_V3 BIT(21)
#define APPS_SPIDEN_DISABLE_V3 BIT(5)
#define APPS_SPNIDEN_DISABLE_V3 BIT(31)
#define DAP_DBGEN_DISABLE_V3 BIT(10)
#define DAP_NIDEN_DISABLE_V3 BIT(23)
#define DAP_SPIDEN_DISABLE_V3 BIT(7)
#define DAP_SPNIDEN_DISABLE_V3 BIT(1)
#define DAP_DEVICEEN_DISABLE_V3 BIT(7)
#define QPDI_SPMI_DISABLE BIT(2)
#define NIDNT_DISABLE BIT(27)
struct fuse_nidnt {
void __iomem *base;
};
struct fuse_qpdi {
void __iomem *base;
};
struct fuse_drvdata {
void __iomem *base;
struct fuse_nidnt *fuse_nidnt;
struct fuse_qpdi *qpdi;
struct device *dev;
struct coresight_device *csdev;
bool fuse_v2;
bool fuse_v3;
};
static struct fuse_drvdata *fusedrvdata;
bool coresight_fuse_nidnt_access_disabled(void)
{
struct fuse_drvdata *drvdata = fusedrvdata;
uint32_t nidnt_fuse;
bool ret;
if (!drvdata || !drvdata->fuse_nidnt)
return false;
nidnt_fuse = fuse_readl(drvdata->fuse_nidnt, 0);
dev_dbg(drvdata->dev, "nidnt_fuse: %lx\n", (unsigned long)nidnt_fuse);
if (nidnt_fuse & NIDNT_DISABLE)
ret = true;
else
ret = false;
if (ret)
dev_dbg(drvdata->dev, "coresight nidnt fuse disabled\n");
return ret;
}
EXPORT_SYMBOL(coresight_fuse_nidnt_access_disabled);
bool coresight_fuse_access_disabled(void)
{
struct fuse_drvdata *drvdata = fusedrvdata;
uint32_t config0, config1, config2;
bool ret = false;
if (!drvdata)
return false;
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 (drvdata->fuse_v3) {
config2 = fuse_readl(drvdata, OEM_CONFIG2);
dev_dbg(drvdata->dev, "config2: %lx\n", (unsigned long)config2);
}
if (drvdata->fuse_v2) {
if (config1 & ALL_DEBUG_DISABLE_V2)
ret = true;
else if (config1 & DAP_DBGEN_DISABLE_V2)
ret = true;
else if (config1 & DAP_NIDEN_DISABLE_V2)
ret = true;
else if (config1 & DAP_SPIDEN_DISABLE_V2)
ret = true;
else if (config1 & DAP_SPNIDEN_DISABLE_V2)
ret = true;
else if (config1 & DAP_DEVICEEN_DISABLE_V2)
ret = true;
} else if (drvdata->fuse_v3) {
if (config0 & ALL_DEBUG_DISABLE_V3)
ret = true;
else if (config1 & DAP_DBGEN_DISABLE_V3)
ret = true;
else if (config1 & DAP_NIDEN_DISABLE_V3)
ret = true;
else if (config2 & DAP_SPIDEN_DISABLE_V3)
ret = true;
else if (config2 & DAP_SPNIDEN_DISABLE_V3)
ret = true;
else if (config1 & DAP_DEVICEEN_DISABLE_V3)
ret = true;
} else {
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;
}
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, config2;
bool ret = false;
if (!drvdata)
return false;
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 (drvdata->fuse_v3) {
config2 = fuse_readl(drvdata, OEM_CONFIG2);
dev_dbg(drvdata->dev, "apps config2: %lx\n",
(unsigned long)config2);
}
if (drvdata->fuse_v2) {
if (config1 & ALL_DEBUG_DISABLE_V2)
ret = true;
else if (config1 & APPS_DBGEN_DISABLE_V2)
ret = true;
else if (config1 & APPS_NIDEN_DISABLE_V2)
ret = true;
else if (config1 & APPS_SPIDEN_DISABLE_V2)
ret = true;
else if (config1 & APPS_SPNIDEN_DISABLE_V2)
ret = true;
else if (config1 & DAP_DEVICEEN_DISABLE_V2)
ret = true;
} else if (drvdata->fuse_v3) {
if (config0 & ALL_DEBUG_DISABLE_V3)
ret = true;
else if (config1 & APPS_DBGEN_DISABLE_V3)
ret = true;
else if (config1 & APPS_NIDEN_DISABLE_V3)
ret = true;
else if (config2 & APPS_SPIDEN_DISABLE_V3)
ret = true;
else if (config1 & APPS_SPNIDEN_DISABLE_V3)
ret = true;
else if (config1 & DAP_DEVICEEN_DISABLE_V3)
ret = true;
} else {
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;
}
if (ret)
dev_dbg(drvdata->dev, "apps fuse disabled\n");
return ret;
}
EXPORT_SYMBOL(coresight_fuse_apps_access_disabled);
bool coresight_fuse_qpdi_access_disabled(void)
{
struct fuse_drvdata *drvdata = fusedrvdata;
uint32_t config;
if (!drvdata || !drvdata->qpdi)
return false;
config = fuse_readl(drvdata->qpdi, FEATURE_CONFIG2);
dev_dbg(drvdata->dev, "qpdi config: %lx\n", (unsigned long)config);
if (config & QPDI_SPMI_DISABLE) {
dev_dbg(drvdata->dev, "qpdi fuse disabled\n");
return true;
} else {
return false;
}
}
EXPORT_SYMBOL(coresight_fuse_qpdi_access_disabled);
static struct of_device_id fuse_match[] = {
{.compatible = CORESIGHT_FUSE_VERSION_V1 },
{.compatible = CORESIGHT_FUSE_VERSION_V2 },
{.compatible = CORESIGHT_FUSE_VERSION_V3 },
{}
};
static int 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;
const struct of_device_id *match;
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);
match = of_match_device(fuse_match, dev);
if (!match)
return -EINVAL;
if (!strcmp(match->compatible, CORESIGHT_FUSE_VERSION_V2))
drvdata->fuse_v2 = true;
else if (!strcmp(match->compatible, CORESIGHT_FUSE_VERSION_V3))
drvdata->fuse_v3 = true;
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;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"qpdi-fuse-base");
if (res) {
drvdata->qpdi = devm_kzalloc(dev, sizeof(*drvdata->qpdi),
GFP_KERNEL);
if (!drvdata->qpdi)
return -ENOMEM;
drvdata->qpdi->base = devm_ioremap(dev, res->start,
resource_size(res));
if (!drvdata->qpdi->base)
return -ENOMEM;
} else {
dev_info(dev, "QPDI fuse not specified\n");
}
res = platform_get_resource_byname(pdev,
IORESOURCE_MEM,
"nidnt-fuse-base");
if (res) {
drvdata->fuse_nidnt = devm_kzalloc(dev,
sizeof(*drvdata->fuse_nidnt),
GFP_KERNEL);
if (!drvdata->fuse_nidnt)
return -ENOMEM;
drvdata->fuse_nidnt->base = devm_ioremap(dev, res->start,
resource_size(res));
if (!drvdata->fuse_nidnt->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 fuse_remove(struct platform_device *pdev)
{
struct fuse_drvdata *drvdata = platform_get_drvdata(pdev);
coresight_unregister(drvdata->csdev);
return 0;
}
static struct platform_driver fuse_driver = {
.probe = fuse_probe,
.remove = 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");