210 lines
5.5 KiB
C
210 lines
5.5 KiB
C
/* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/of_device.h>
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#include <soc/qcom/jtag.h>
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#define fuse_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off)
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#define fuse_readl(drvdata, off) __raw_readl(drvdata->base + off)
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#define OEM_CONFIG0 (0x000)
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#define OEM_CONFIG1 (0x004)
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#define OEM_CONFIG2 (0x008)
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/* JTAG FUSE V1 */
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#define ALL_DEBUG_DISABLE BIT(21)
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#define APPS_DBGEN_DISABLE BIT(0)
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#define APPS_NIDEN_DISABLE BIT(1)
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#define APPS_SPIDEN_DISABLE BIT(2)
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#define APPS_SPNIDEN_DISABLE BIT(3)
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#define DAP_DEVICEEN_DISABLE BIT(8)
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/* JTAG FUSE V2 */
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#define ALL_DEBUG_DISABLE_V2 BIT(0)
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#define APPS_DBGEN_DISABLE_V2 BIT(10)
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#define APPS_NIDEN_DISABLE_V2 BIT(11)
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#define APPS_SPIDEN_DISABLE_V2 BIT(12)
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#define APPS_SPNIDEN_DISABLE_V2 BIT(13)
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#define DAP_DEVICEEN_DISABLE_V2 BIT(18)
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/* JTAG FUSE V3 */
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#define ALL_DEBUG_DISABLE_V3 BIT(29)
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#define APPS_DBGEN_DISABLE_V3 BIT(8)
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#define APPS_NIDEN_DISABLE_V3 BIT(21)
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#define APPS_SPIDEN_DISABLE_V3 BIT(5)
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#define APPS_SPNIDEN_DISABLE_V3 BIT(31)
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#define DAP_DEVICEEN_DISABLE_V3 BIT(7)
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#define JTAG_FUSE_VERSION_V1 "qcom,jtag-fuse"
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#define JTAG_FUSE_VERSION_V2 "qcom,jtag-fuse-v2"
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#define JTAG_FUSE_VERSION_V3 "qcom,jtag-fuse-v3"
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struct fuse_drvdata {
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void __iomem *base;
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struct device *dev;
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bool fuse_v2;
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bool fuse_v3;
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};
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static struct fuse_drvdata *fusedrvdata;
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bool msm_jtag_fuse_apps_access_disabled(void)
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{
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struct fuse_drvdata *drvdata = fusedrvdata;
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uint32_t config0, config1, config2;
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bool ret = false;
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if (!drvdata)
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return false;
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config0 = fuse_readl(drvdata, OEM_CONFIG0);
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config1 = fuse_readl(drvdata, OEM_CONFIG1);
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dev_dbg(drvdata->dev, "apps config0: %lx\n", (unsigned long)config0);
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dev_dbg(drvdata->dev, "apps config1: %lx\n", (unsigned long)config1);
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if (drvdata->fuse_v3) {
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config2 = fuse_readl(drvdata, OEM_CONFIG2);
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dev_dbg(drvdata->dev, "apps config2: %lx\n",
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(unsigned long)config2);
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}
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if (drvdata->fuse_v3) {
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if (config0 & ALL_DEBUG_DISABLE_V3)
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ret = true;
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else if (config1 & APPS_DBGEN_DISABLE_V3)
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ret = true;
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else if (config1 & APPS_NIDEN_DISABLE_V3)
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ret = true;
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else if (config2 & APPS_SPIDEN_DISABLE_V3)
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ret = true;
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else if (config1 & APPS_SPNIDEN_DISABLE_V3)
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ret = true;
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else if (config1 & DAP_DEVICEEN_DISABLE_V3)
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ret = true;
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} else if (drvdata->fuse_v2) {
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if (config1 & ALL_DEBUG_DISABLE_V2)
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ret = true;
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else if (config1 & APPS_DBGEN_DISABLE_V2)
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ret = true;
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else if (config1 & APPS_NIDEN_DISABLE_V2)
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ret = true;
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else if (config1 & APPS_SPIDEN_DISABLE_V2)
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ret = true;
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else if (config1 & APPS_SPNIDEN_DISABLE_V2)
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ret = true;
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else if (config1 & DAP_DEVICEEN_DISABLE_V2)
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ret = true;
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} else {
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if (config0 & ALL_DEBUG_DISABLE)
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ret = true;
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else if (config1 & APPS_DBGEN_DISABLE)
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ret = true;
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else if (config1 & APPS_NIDEN_DISABLE)
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ret = true;
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else if (config1 & APPS_SPIDEN_DISABLE)
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ret = true;
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else if (config1 & APPS_SPNIDEN_DISABLE)
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ret = true;
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else if (config1 & DAP_DEVICEEN_DISABLE)
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ret = true;
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}
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if (ret)
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dev_dbg(drvdata->dev, "apps fuse disabled\n");
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return ret;
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}
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EXPORT_SYMBOL(msm_jtag_fuse_apps_access_disabled);
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static struct of_device_id jtag_fuse_match[] = {
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{.compatible = JTAG_FUSE_VERSION_V1 },
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{.compatible = JTAG_FUSE_VERSION_V2 },
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{.compatible = JTAG_FUSE_VERSION_V3 },
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{}
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};
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static int jtag_fuse_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct fuse_drvdata *drvdata;
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struct resource *res;
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const struct of_device_id *match;
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drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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drvdata->dev = &pdev->dev;
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platform_set_drvdata(pdev, drvdata);
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match = of_match_device(jtag_fuse_match, dev);
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if (!match)
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return -EINVAL;
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if (!strcmp(match->compatible, JTAG_FUSE_VERSION_V2))
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drvdata->fuse_v2 = true;
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else if (!strcmp(match->compatible, JTAG_FUSE_VERSION_V3))
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drvdata->fuse_v3 = true;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fuse-base");
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if (!res)
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return -ENODEV;
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drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
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if (!drvdata->base)
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return -ENOMEM;
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/* Store the driver data pointer for use in exported functions */
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fusedrvdata = drvdata;
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dev_info(dev, "JTag Fuse initialized\n");
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return 0;
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}
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static int jtag_fuse_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static struct platform_driver jtag_fuse_driver = {
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.probe = jtag_fuse_probe,
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.remove = jtag_fuse_remove,
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.driver = {
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.name = "msm-jtag-fuse",
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.owner = THIS_MODULE,
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.of_match_table = jtag_fuse_match,
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},
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};
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static int __init jtag_fuse_init(void)
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{
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return platform_driver_register(&jtag_fuse_driver);
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}
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arch_initcall(jtag_fuse_init);
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static void __exit jtag_fuse_exit(void)
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{
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platform_driver_unregister(&jtag_fuse_driver);
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}
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module_exit(jtag_fuse_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("JTag Fuse driver");
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