407 lines
10 KiB
C
407 lines
10 KiB
C
/* Copyright (c) 2013-2015, 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/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.h>
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#include <linux/of_coresight.h>
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#include <linux/of_device.h>
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#include <linux/coresight.h>
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#include "coresight-priv.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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#define FEATURE_CONFIG2 (0x000)
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#define CORESIGHT_FUSE_VERSION_V1 "arm,coresight-fuse"
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#define CORESIGHT_FUSE_VERSION_V2 "arm,coresight-fuse-v2"
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#define CORESIGHT_FUSE_VERSION_V3 "arm,coresight-fuse-v3"
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/* CoreSight 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_DBGEN_DISABLE BIT(4)
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#define DAP_NIDEN_DISABLE BIT(5)
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#define DAP_SPIDEN_DISABLE BIT(6)
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#define DAP_SPNIDEN_DISABLE BIT(7)
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#define DAP_DEVICEEN_DISABLE BIT(8)
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/* CoreSight 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_DBGEN_DISABLE_V2 BIT(14)
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#define DAP_NIDEN_DISABLE_V2 BIT(15)
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#define DAP_SPIDEN_DISABLE_V2 BIT(16)
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#define DAP_SPNIDEN_DISABLE_V2 BIT(17)
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#define DAP_DEVICEEN_DISABLE_V2 BIT(18)
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/* CoreSight 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_DBGEN_DISABLE_V3 BIT(10)
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#define DAP_NIDEN_DISABLE_V3 BIT(23)
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#define DAP_SPIDEN_DISABLE_V3 BIT(7)
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#define DAP_SPNIDEN_DISABLE_V3 BIT(1)
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#define DAP_DEVICEEN_DISABLE_V3 BIT(7)
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#define QPDI_SPMI_DISABLE BIT(2)
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#define NIDNT_DISABLE BIT(27)
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struct fuse_nidnt {
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void __iomem *base;
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};
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struct fuse_qpdi {
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void __iomem *base;
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};
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struct fuse_drvdata {
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void __iomem *base;
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struct fuse_nidnt *fuse_nidnt;
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struct fuse_qpdi *qpdi;
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struct device *dev;
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struct coresight_device *csdev;
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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 coresight_fuse_nidnt_access_disabled(void)
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{
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struct fuse_drvdata *drvdata = fusedrvdata;
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uint32_t nidnt_fuse;
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bool ret;
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if (!drvdata || !drvdata->fuse_nidnt)
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return false;
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nidnt_fuse = fuse_readl(drvdata->fuse_nidnt, 0);
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dev_dbg(drvdata->dev, "nidnt_fuse: %lx\n", (unsigned long)nidnt_fuse);
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if (nidnt_fuse & NIDNT_DISABLE)
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ret = true;
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else
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ret = false;
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if (ret)
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dev_dbg(drvdata->dev, "coresight nidnt fuse disabled\n");
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return ret;
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}
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EXPORT_SYMBOL(coresight_fuse_nidnt_access_disabled);
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bool coresight_fuse_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, "config0: %lx\n", (unsigned long)config0);
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dev_dbg(drvdata->dev, "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, "config2: %lx\n", (unsigned long)config2);
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}
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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 & DAP_DBGEN_DISABLE_V2)
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ret = true;
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else if (config1 & DAP_NIDEN_DISABLE_V2)
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ret = true;
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else if (config1 & DAP_SPIDEN_DISABLE_V2)
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ret = true;
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else if (config1 & DAP_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 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 & DAP_DBGEN_DISABLE_V3)
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ret = true;
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else if (config1 & DAP_NIDEN_DISABLE_V3)
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ret = true;
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else if (config2 & DAP_SPIDEN_DISABLE_V3)
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ret = true;
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else if (config2 & DAP_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 {
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if (config0 & ALL_DEBUG_DISABLE)
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ret = true;
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else if (config1 & DAP_DBGEN_DISABLE)
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ret = true;
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else if (config1 & DAP_NIDEN_DISABLE)
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ret = true;
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else if (config1 & DAP_SPIDEN_DISABLE)
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ret = true;
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else if (config1 & DAP_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, "coresight fuse disabled\n");
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return ret;
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}
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EXPORT_SYMBOL(coresight_fuse_access_disabled);
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bool coresight_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_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 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 {
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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(coresight_fuse_apps_access_disabled);
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bool coresight_fuse_qpdi_access_disabled(void)
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{
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struct fuse_drvdata *drvdata = fusedrvdata;
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uint32_t config;
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if (!drvdata || !drvdata->qpdi)
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return false;
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config = fuse_readl(drvdata->qpdi, FEATURE_CONFIG2);
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dev_dbg(drvdata->dev, "qpdi config: %lx\n", (unsigned long)config);
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if (config & QPDI_SPMI_DISABLE) {
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dev_dbg(drvdata->dev, "qpdi fuse disabled\n");
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return true;
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} else {
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return false;
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}
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}
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EXPORT_SYMBOL(coresight_fuse_qpdi_access_disabled);
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static struct of_device_id fuse_match[] = {
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{.compatible = CORESIGHT_FUSE_VERSION_V1 },
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{.compatible = CORESIGHT_FUSE_VERSION_V2 },
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{.compatible = CORESIGHT_FUSE_VERSION_V3 },
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{}
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};
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static int fuse_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct coresight_platform_data *pdata;
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struct fuse_drvdata *drvdata;
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struct resource *res;
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struct coresight_desc *desc;
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const struct of_device_id *match;
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pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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pdev->dev.platform_data = pdata;
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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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/* Store the driver data pointer for use in exported functions */
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fusedrvdata = drvdata;
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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(fuse_match, dev);
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if (!match)
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return -EINVAL;
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if (!strcmp(match->compatible, CORESIGHT_FUSE_VERSION_V2))
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drvdata->fuse_v2 = true;
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else if (!strcmp(match->compatible, CORESIGHT_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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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"qpdi-fuse-base");
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if (res) {
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drvdata->qpdi = devm_kzalloc(dev, sizeof(*drvdata->qpdi),
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GFP_KERNEL);
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if (!drvdata->qpdi)
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return -ENOMEM;
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drvdata->qpdi->base = devm_ioremap(dev, res->start,
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resource_size(res));
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if (!drvdata->qpdi->base)
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return -ENOMEM;
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} else {
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dev_info(dev, "QPDI fuse not specified\n");
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}
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res = platform_get_resource_byname(pdev,
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IORESOURCE_MEM,
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"nidnt-fuse-base");
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if (res) {
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drvdata->fuse_nidnt = devm_kzalloc(dev,
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sizeof(*drvdata->fuse_nidnt),
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GFP_KERNEL);
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if (!drvdata->fuse_nidnt)
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return -ENOMEM;
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drvdata->fuse_nidnt->base = devm_ioremap(dev, res->start,
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resource_size(res));
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if (!drvdata->fuse_nidnt->base)
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return -ENOMEM;
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}
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desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
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if (!desc)
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return -ENOMEM;
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desc->type = CORESIGHT_DEV_TYPE_NONE;
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desc->pdata = pdev->dev.platform_data;
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desc->dev = &pdev->dev;
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desc->owner = THIS_MODULE;
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drvdata->csdev = coresight_register(desc);
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if (IS_ERR(drvdata->csdev))
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return PTR_ERR(drvdata->csdev);
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dev_info(dev, "Fuse initialized\n");
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return 0;
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}
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static int fuse_remove(struct platform_device *pdev)
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{
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struct fuse_drvdata *drvdata = platform_get_drvdata(pdev);
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coresight_unregister(drvdata->csdev);
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return 0;
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}
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static struct platform_driver fuse_driver = {
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.probe = fuse_probe,
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.remove = fuse_remove,
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.driver = {
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.name = "coresight-fuse",
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.owner = THIS_MODULE,
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.of_match_table = fuse_match,
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},
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};
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static int __init fuse_init(void)
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{
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return platform_driver_register(&fuse_driver);
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}
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module_init(fuse_init);
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static void __exit fuse_exit(void)
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{
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platform_driver_unregister(&fuse_driver);
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}
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module_exit(fuse_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("CoreSight Fuse driver");
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