Loading drivers/hwtracing/coresight/Kconfig +10 −0 Original line number Diff line number Diff line Loading @@ -145,6 +145,16 @@ config CORESIGHT_CSR Those configuration registers can be used to control, various coresight configurations. config CORESIGHT_HWEVENT bool "CoreSight Hardware Event driver" depends on CORESIGHT_STM select CORESIGHT_CSR help This driver provides support for monitoring and tracing CoreSight Hardware Event across STM interface. It configures Coresight Hardware Event mux control registers to select hardware events based on user input. config CORESIGHT_DUMMY bool "Dummy driver support" help Loading drivers/hwtracing/coresight/Makefile +1 −0 Original line number Diff line number Diff line Loading @@ -19,6 +19,7 @@ obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o obj-$(CONFIG_CORESIGHT_TPDA) += coresight-tpda.o obj-$(CONFIG_CORESIGHT_TPDM) += coresight-tpdm.o obj-$(CONFIG_CORESIGHT_HWEVENT) += coresight-hwevent.o obj-$(CONFIG_CORESIGHT_DUMMY) += coresight-dummy.o obj-$(CONFIG_CORESIGHT_CSR) += coresight-csr.o obj-$(CONFIG_CORESIGHT_TGU) += coresight-tgu.o drivers/hwtracing/coresight/coresight-common.h +10 −0 Original line number Diff line number Diff line Loading @@ -23,6 +23,14 @@ extern int coresight_csr_hwctrl_set(struct coresight_csr *csr, uint64_t addr, extern void coresight_csr_set_byte_cntr(struct coresight_csr *csr, uint32_t count); extern struct coresight_csr *coresight_csr_get(const char *name); #if IS_ENABLED(CONFIG_OF) extern int of_get_coresight_csr_name(struct device_node *node, const char **csr_name); #else static inline int of_get_coresight_csr_name(struct device_node *node, const char **csr_name){ return -EINVAL; } #endif #else static inline void msm_qdss_csr_enable_bam_to_usb(struct coresight_csr *csr) {} static inline void msm_qdss_csr_disable_bam_to_usb(struct coresight_csr *csr) {} Loading @@ -33,6 +41,8 @@ static inline void coresight_csr_set_byte_cntr(struct coresight_csr *csr, uint32_t count) {} static inline struct coresight_csr *coresight_csr_get(const char *name) { return NULL; } static inline int of_get_coresight_csr_name(struct device_node *node, const char **csr_name){ return -EINVAL; } #endif #endif drivers/hwtracing/coresight/coresight-csr.c +15 −0 Original line number Diff line number Diff line Loading @@ -248,6 +248,21 @@ struct coresight_csr *coresight_csr_get(const char *name) } EXPORT_SYMBOL(coresight_csr_get); int of_get_coresight_csr_name(struct device_node *node, const char **csr_name) { int ret; struct device_node *csr_node; csr_node = of_parse_phandle(node, "coresight-csr", 0); if (!csr_node) return -EINVAL; ret = of_property_read_string(csr_node, "coresight-name", csr_name); of_node_put(csr_node); return ret; } EXPORT_SYMBOL(of_get_coresight_csr_name); static ssize_t timestamp_show(struct device *dev, struct device_attribute *attr, char *buf) Loading drivers/hwtracing/coresight/coresight-hwevent.c 0 → 100644 +350 −0 Original line number Diff line number Diff line // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2013-2017, 2019, The Linux Foundation. All rights reserved. */ #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/mutex.h> #include <linux/clk.h> #include <linux/coresight.h> #include <linux/of.h> #include <linux/regulator/consumer.h> #include "coresight-priv.h" struct hwevent_mux { phys_addr_t start; phys_addr_t end; }; struct hwevent_drvdata { struct device *dev; struct coresight_device *csdev; struct clk *clk; struct mutex mutex; int nr_hclk; struct clk **hclk; int nr_hreg; struct regulator **hreg; int nr_hmux; struct hwevent_mux *hmux; struct coresight_csr *csr; const char *csr_name; }; DEFINE_CORESIGHT_DEVLIST(hwevent_devs, "hwevent"); static int hwevent_enable(struct hwevent_drvdata *drvdata) { int ret, i, j; ret = clk_prepare_enable(drvdata->clk); if (ret) return ret; for (i = 0; i < drvdata->nr_hreg; i++) { ret = regulator_enable(drvdata->hreg[i]); if (ret) goto err0; } for (j = 0; j < drvdata->nr_hclk; j++) { ret = clk_prepare_enable(drvdata->hclk[j]); if (ret) goto err1; } return 0; err1: for (j--; j >= 0; j--) clk_disable_unprepare(drvdata->hclk[j]); err0: for (i--; i >= 0; i--) regulator_disable(drvdata->hreg[i]); clk_disable_unprepare(drvdata->clk); return ret; } static void hwevent_disable(struct hwevent_drvdata *drvdata) { int i; clk_disable_unprepare(drvdata->clk); for (i = 0; i < drvdata->nr_hclk; i++) clk_disable_unprepare(drvdata->hclk[i]); for (i = 0; i < drvdata->nr_hreg; i++) regulator_disable(drvdata->hreg[i]); } static ssize_t setreg_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent); void *hwereg; unsigned long long addr; unsigned long val; int ret, i; if (sscanf(buf, "%llx %lx", &addr, &val) != 2) return -EINVAL; mutex_lock(&drvdata->mutex); ret = hwevent_enable(drvdata); if (ret) { mutex_unlock(&drvdata->mutex); return ret; } for (i = 0; i < drvdata->nr_hmux; i++) { if ((addr >= drvdata->hmux[i].start) && (addr < drvdata->hmux[i].end)) { hwereg = ioremap(drvdata->hmux[i].start, drvdata->hmux[i].end - drvdata->hmux[i].start); if (!hwereg) { dev_err(dev, "unable to map address 0x%llx\n", addr); ret = -ENOMEM; goto err; } writel_relaxed(val, hwereg + addr - drvdata->hmux[i].start); /* * Ensure writes to hwevent control registers * are completed before unmapping the address */ mb(); iounmap(hwereg); break; } } if (i == drvdata->nr_hmux) { ret = coresight_csr_hwctrl_set(drvdata->csr, addr, val); if (ret) { dev_err(dev, "invalid mux control register address\n"); ret = -EINVAL; goto err; } } hwevent_disable(drvdata); mutex_unlock(&drvdata->mutex); return size; err: hwevent_disable(drvdata); mutex_unlock(&drvdata->mutex); return ret; } static DEVICE_ATTR_WO(setreg); static struct attribute *hwevent_attrs[] = { &dev_attr_setreg.attr, NULL, }; static struct attribute_group hwevent_attr_grp = { .attrs = hwevent_attrs, }; static const struct attribute_group *hwevent_attr_grps[] = { &hwevent_attr_grp, NULL, }; static int hwevent_init_hmux(struct hwevent_drvdata *drvdata, struct platform_device *pdev) { int ret, i; struct resource *res; const char *hmux_name; struct device_node *node = drvdata->dev->of_node; drvdata->nr_hmux = of_property_count_strings(node, "reg-names"); if (drvdata->nr_hmux < 0) drvdata->nr_hmux = 0; if (drvdata->nr_hmux > 0) { drvdata->hmux = devm_kzalloc(drvdata->dev, drvdata->nr_hmux * sizeof(*drvdata->hmux), GFP_KERNEL); if (!drvdata->hmux) return -ENOMEM; for (i = 0; i < drvdata->nr_hmux; i++) { ret = of_property_read_string_index(node, "reg-names", i, &hmux_name); if (ret) return ret; res = platform_get_resource_byname(pdev, IORESOURCE_MEM, hmux_name); if (!res) return -ENODEV; drvdata->hmux[i].start = res->start; drvdata->hmux[i].end = res->end; } } return 0; } static int hwevent_init_clk(struct hwevent_drvdata *drvdata) { int ret, i; const char *hclk_name, *hreg_name; struct device_node *node = drvdata->dev->of_node; drvdata->nr_hclk = of_property_count_strings(node, "qcom,hwevent-clks"); drvdata->nr_hreg = of_property_count_strings(node, "qcom,hwevent-regs"); if (drvdata->nr_hclk > 0) { drvdata->hclk = devm_kzalloc(drvdata->dev, drvdata->nr_hclk * sizeof(*drvdata->hclk), GFP_KERNEL); if (!drvdata->hclk) return -ENOMEM; for (i = 0; i < drvdata->nr_hclk; i++) { ret = of_property_read_string_index(node, "qcom,hwevent-clks", i, &hclk_name); if (ret) return ret; drvdata->hclk[i] = devm_clk_get(drvdata->dev, hclk_name); if (IS_ERR(drvdata->hclk[i])) return PTR_ERR(drvdata->hclk[i]); } } if (drvdata->nr_hreg > 0) { drvdata->hreg = devm_kzalloc(drvdata->dev, drvdata->nr_hreg * sizeof(*drvdata->hreg), GFP_KERNEL); if (!drvdata->hreg) return -ENOMEM; for (i = 0; i < drvdata->nr_hreg; i++) { ret = of_property_read_string_index(node, "qcom,hwevent-regs", i, &hreg_name); if (ret) return ret; drvdata->hreg[i] = devm_regulator_get(drvdata->dev, hreg_name); if (IS_ERR(drvdata->hreg[i])) return PTR_ERR(drvdata->hreg[i]); } } return 0; } static int hwevent_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct hwevent_drvdata *drvdata; struct coresight_desc desc = { 0 }; struct coresight_platform_data *pdata; int ret; desc.name = coresight_alloc_device_name(&hwevent_devs, dev); if (!desc.name) return -ENOMEM; pdata = coresight_get_platform_data(dev); 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; drvdata->dev = &pdev->dev; platform_set_drvdata(pdev, drvdata); mutex_init(&drvdata->mutex); ret = of_get_coresight_csr_name(dev->of_node, &drvdata->csr_name); if (ret) dev_err(dev, "No csr data\n"); else { drvdata->csr = coresight_csr_get(drvdata->csr_name); if (IS_ERR(drvdata->csr)) { dev_dbg(dev, "failed to get csr, defer probe\n"); return -EPROBE_DEFER; } } drvdata->clk = devm_clk_get(dev, "apb_pclk"); if (IS_ERR(drvdata->clk)) return PTR_ERR(drvdata->clk); ret = hwevent_init_hmux(drvdata, pdev); if (ret) return ret; ret = hwevent_init_clk(drvdata); if (ret) return ret; desc.type = CORESIGHT_DEV_TYPE_NONE; desc.pdata = pdev->dev.platform_data; desc.dev = &pdev->dev; desc.groups = hwevent_attr_grps; drvdata->csdev = coresight_register(&desc); if (IS_ERR(drvdata->csdev)) return PTR_ERR(drvdata->csdev); dev_dbg(dev, "Hardware Event driver initialized\n"); return 0; } static int hwevent_remove(struct platform_device *pdev) { struct hwevent_drvdata *drvdata = platform_get_drvdata(pdev); coresight_unregister(drvdata->csdev); return 0; } static const struct of_device_id hwevent_match[] = { {.compatible = "qcom,coresight-hwevent"}, {}, }; static struct platform_driver hwevent_driver = { .probe = hwevent_probe, .remove = hwevent_remove, .driver = { .name = "coresight-hwevent", .of_match_table = hwevent_match, }, }; static int __init hwevent_init(void) { return platform_driver_register(&hwevent_driver); } module_init(hwevent_init); static void __exit hwevent_exit(void) { platform_driver_unregister(&hwevent_driver); } module_exit(hwevent_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("CoreSight Hardware Event driver"); Loading
drivers/hwtracing/coresight/Kconfig +10 −0 Original line number Diff line number Diff line Loading @@ -145,6 +145,16 @@ config CORESIGHT_CSR Those configuration registers can be used to control, various coresight configurations. config CORESIGHT_HWEVENT bool "CoreSight Hardware Event driver" depends on CORESIGHT_STM select CORESIGHT_CSR help This driver provides support for monitoring and tracing CoreSight Hardware Event across STM interface. It configures Coresight Hardware Event mux control registers to select hardware events based on user input. config CORESIGHT_DUMMY bool "Dummy driver support" help Loading
drivers/hwtracing/coresight/Makefile +1 −0 Original line number Diff line number Diff line Loading @@ -19,6 +19,7 @@ obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o obj-$(CONFIG_CORESIGHT_TPDA) += coresight-tpda.o obj-$(CONFIG_CORESIGHT_TPDM) += coresight-tpdm.o obj-$(CONFIG_CORESIGHT_HWEVENT) += coresight-hwevent.o obj-$(CONFIG_CORESIGHT_DUMMY) += coresight-dummy.o obj-$(CONFIG_CORESIGHT_CSR) += coresight-csr.o obj-$(CONFIG_CORESIGHT_TGU) += coresight-tgu.o
drivers/hwtracing/coresight/coresight-common.h +10 −0 Original line number Diff line number Diff line Loading @@ -23,6 +23,14 @@ extern int coresight_csr_hwctrl_set(struct coresight_csr *csr, uint64_t addr, extern void coresight_csr_set_byte_cntr(struct coresight_csr *csr, uint32_t count); extern struct coresight_csr *coresight_csr_get(const char *name); #if IS_ENABLED(CONFIG_OF) extern int of_get_coresight_csr_name(struct device_node *node, const char **csr_name); #else static inline int of_get_coresight_csr_name(struct device_node *node, const char **csr_name){ return -EINVAL; } #endif #else static inline void msm_qdss_csr_enable_bam_to_usb(struct coresight_csr *csr) {} static inline void msm_qdss_csr_disable_bam_to_usb(struct coresight_csr *csr) {} Loading @@ -33,6 +41,8 @@ static inline void coresight_csr_set_byte_cntr(struct coresight_csr *csr, uint32_t count) {} static inline struct coresight_csr *coresight_csr_get(const char *name) { return NULL; } static inline int of_get_coresight_csr_name(struct device_node *node, const char **csr_name){ return -EINVAL; } #endif #endif
drivers/hwtracing/coresight/coresight-csr.c +15 −0 Original line number Diff line number Diff line Loading @@ -248,6 +248,21 @@ struct coresight_csr *coresight_csr_get(const char *name) } EXPORT_SYMBOL(coresight_csr_get); int of_get_coresight_csr_name(struct device_node *node, const char **csr_name) { int ret; struct device_node *csr_node; csr_node = of_parse_phandle(node, "coresight-csr", 0); if (!csr_node) return -EINVAL; ret = of_property_read_string(csr_node, "coresight-name", csr_name); of_node_put(csr_node); return ret; } EXPORT_SYMBOL(of_get_coresight_csr_name); static ssize_t timestamp_show(struct device *dev, struct device_attribute *attr, char *buf) Loading
drivers/hwtracing/coresight/coresight-hwevent.c 0 → 100644 +350 −0 Original line number Diff line number Diff line // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2013-2017, 2019, The Linux Foundation. All rights reserved. */ #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/mutex.h> #include <linux/clk.h> #include <linux/coresight.h> #include <linux/of.h> #include <linux/regulator/consumer.h> #include "coresight-priv.h" struct hwevent_mux { phys_addr_t start; phys_addr_t end; }; struct hwevent_drvdata { struct device *dev; struct coresight_device *csdev; struct clk *clk; struct mutex mutex; int nr_hclk; struct clk **hclk; int nr_hreg; struct regulator **hreg; int nr_hmux; struct hwevent_mux *hmux; struct coresight_csr *csr; const char *csr_name; }; DEFINE_CORESIGHT_DEVLIST(hwevent_devs, "hwevent"); static int hwevent_enable(struct hwevent_drvdata *drvdata) { int ret, i, j; ret = clk_prepare_enable(drvdata->clk); if (ret) return ret; for (i = 0; i < drvdata->nr_hreg; i++) { ret = regulator_enable(drvdata->hreg[i]); if (ret) goto err0; } for (j = 0; j < drvdata->nr_hclk; j++) { ret = clk_prepare_enable(drvdata->hclk[j]); if (ret) goto err1; } return 0; err1: for (j--; j >= 0; j--) clk_disable_unprepare(drvdata->hclk[j]); err0: for (i--; i >= 0; i--) regulator_disable(drvdata->hreg[i]); clk_disable_unprepare(drvdata->clk); return ret; } static void hwevent_disable(struct hwevent_drvdata *drvdata) { int i; clk_disable_unprepare(drvdata->clk); for (i = 0; i < drvdata->nr_hclk; i++) clk_disable_unprepare(drvdata->hclk[i]); for (i = 0; i < drvdata->nr_hreg; i++) regulator_disable(drvdata->hreg[i]); } static ssize_t setreg_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent); void *hwereg; unsigned long long addr; unsigned long val; int ret, i; if (sscanf(buf, "%llx %lx", &addr, &val) != 2) return -EINVAL; mutex_lock(&drvdata->mutex); ret = hwevent_enable(drvdata); if (ret) { mutex_unlock(&drvdata->mutex); return ret; } for (i = 0; i < drvdata->nr_hmux; i++) { if ((addr >= drvdata->hmux[i].start) && (addr < drvdata->hmux[i].end)) { hwereg = ioremap(drvdata->hmux[i].start, drvdata->hmux[i].end - drvdata->hmux[i].start); if (!hwereg) { dev_err(dev, "unable to map address 0x%llx\n", addr); ret = -ENOMEM; goto err; } writel_relaxed(val, hwereg + addr - drvdata->hmux[i].start); /* * Ensure writes to hwevent control registers * are completed before unmapping the address */ mb(); iounmap(hwereg); break; } } if (i == drvdata->nr_hmux) { ret = coresight_csr_hwctrl_set(drvdata->csr, addr, val); if (ret) { dev_err(dev, "invalid mux control register address\n"); ret = -EINVAL; goto err; } } hwevent_disable(drvdata); mutex_unlock(&drvdata->mutex); return size; err: hwevent_disable(drvdata); mutex_unlock(&drvdata->mutex); return ret; } static DEVICE_ATTR_WO(setreg); static struct attribute *hwevent_attrs[] = { &dev_attr_setreg.attr, NULL, }; static struct attribute_group hwevent_attr_grp = { .attrs = hwevent_attrs, }; static const struct attribute_group *hwevent_attr_grps[] = { &hwevent_attr_grp, NULL, }; static int hwevent_init_hmux(struct hwevent_drvdata *drvdata, struct platform_device *pdev) { int ret, i; struct resource *res; const char *hmux_name; struct device_node *node = drvdata->dev->of_node; drvdata->nr_hmux = of_property_count_strings(node, "reg-names"); if (drvdata->nr_hmux < 0) drvdata->nr_hmux = 0; if (drvdata->nr_hmux > 0) { drvdata->hmux = devm_kzalloc(drvdata->dev, drvdata->nr_hmux * sizeof(*drvdata->hmux), GFP_KERNEL); if (!drvdata->hmux) return -ENOMEM; for (i = 0; i < drvdata->nr_hmux; i++) { ret = of_property_read_string_index(node, "reg-names", i, &hmux_name); if (ret) return ret; res = platform_get_resource_byname(pdev, IORESOURCE_MEM, hmux_name); if (!res) return -ENODEV; drvdata->hmux[i].start = res->start; drvdata->hmux[i].end = res->end; } } return 0; } static int hwevent_init_clk(struct hwevent_drvdata *drvdata) { int ret, i; const char *hclk_name, *hreg_name; struct device_node *node = drvdata->dev->of_node; drvdata->nr_hclk = of_property_count_strings(node, "qcom,hwevent-clks"); drvdata->nr_hreg = of_property_count_strings(node, "qcom,hwevent-regs"); if (drvdata->nr_hclk > 0) { drvdata->hclk = devm_kzalloc(drvdata->dev, drvdata->nr_hclk * sizeof(*drvdata->hclk), GFP_KERNEL); if (!drvdata->hclk) return -ENOMEM; for (i = 0; i < drvdata->nr_hclk; i++) { ret = of_property_read_string_index(node, "qcom,hwevent-clks", i, &hclk_name); if (ret) return ret; drvdata->hclk[i] = devm_clk_get(drvdata->dev, hclk_name); if (IS_ERR(drvdata->hclk[i])) return PTR_ERR(drvdata->hclk[i]); } } if (drvdata->nr_hreg > 0) { drvdata->hreg = devm_kzalloc(drvdata->dev, drvdata->nr_hreg * sizeof(*drvdata->hreg), GFP_KERNEL); if (!drvdata->hreg) return -ENOMEM; for (i = 0; i < drvdata->nr_hreg; i++) { ret = of_property_read_string_index(node, "qcom,hwevent-regs", i, &hreg_name); if (ret) return ret; drvdata->hreg[i] = devm_regulator_get(drvdata->dev, hreg_name); if (IS_ERR(drvdata->hreg[i])) return PTR_ERR(drvdata->hreg[i]); } } return 0; } static int hwevent_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct hwevent_drvdata *drvdata; struct coresight_desc desc = { 0 }; struct coresight_platform_data *pdata; int ret; desc.name = coresight_alloc_device_name(&hwevent_devs, dev); if (!desc.name) return -ENOMEM; pdata = coresight_get_platform_data(dev); 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; drvdata->dev = &pdev->dev; platform_set_drvdata(pdev, drvdata); mutex_init(&drvdata->mutex); ret = of_get_coresight_csr_name(dev->of_node, &drvdata->csr_name); if (ret) dev_err(dev, "No csr data\n"); else { drvdata->csr = coresight_csr_get(drvdata->csr_name); if (IS_ERR(drvdata->csr)) { dev_dbg(dev, "failed to get csr, defer probe\n"); return -EPROBE_DEFER; } } drvdata->clk = devm_clk_get(dev, "apb_pclk"); if (IS_ERR(drvdata->clk)) return PTR_ERR(drvdata->clk); ret = hwevent_init_hmux(drvdata, pdev); if (ret) return ret; ret = hwevent_init_clk(drvdata); if (ret) return ret; desc.type = CORESIGHT_DEV_TYPE_NONE; desc.pdata = pdev->dev.platform_data; desc.dev = &pdev->dev; desc.groups = hwevent_attr_grps; drvdata->csdev = coresight_register(&desc); if (IS_ERR(drvdata->csdev)) return PTR_ERR(drvdata->csdev); dev_dbg(dev, "Hardware Event driver initialized\n"); return 0; } static int hwevent_remove(struct platform_device *pdev) { struct hwevent_drvdata *drvdata = platform_get_drvdata(pdev); coresight_unregister(drvdata->csdev); return 0; } static const struct of_device_id hwevent_match[] = { {.compatible = "qcom,coresight-hwevent"}, {}, }; static struct platform_driver hwevent_driver = { .probe = hwevent_probe, .remove = hwevent_remove, .driver = { .name = "coresight-hwevent", .of_match_table = hwevent_match, }, }; static int __init hwevent_init(void) { return platform_driver_register(&hwevent_driver); } module_init(hwevent_init); static void __exit hwevent_exit(void) { platform_driver_unregister(&hwevent_driver); } module_exit(hwevent_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("CoreSight Hardware Event driver");
