| /* 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"); |