From 620cf787c121f39b5223e43bad3d1b7c66ecead5 Mon Sep 17 00:00:00 2001 From: Pratik Patel Date: Tue, 19 May 2015 10:55:21 -0600 Subject: [PATCH] coresight: replicator: Add Qualcomm CoreSight Replicator driver This driver manages Qualcomm CoreSight Replicator device, which resides on the AMBA bus. Replicator has been made programmable to allow software to turn of the replicator branch to sink that is not being used. This avoids trace traffic to the unused/non-current sink from causing back pressure that results in overflows at the source. Signed-off-by: Pratik Patel Signed-off-by: Ivan T. Ivanov Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- .../devicetree/bindings/arm/coresight.txt | 1 + drivers/hwtracing/coresight/Kconfig | 8 + drivers/hwtracing/coresight/Makefile | 1 + .../coresight/coresight-replicator-qcom.c | 214 ++++++++++++++++++ 4 files changed, 224 insertions(+) create mode 100644 drivers/hwtracing/coresight/coresight-replicator-qcom.c diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt index 8711c1065479..65a6db2271a2 100644 --- a/Documentation/devicetree/bindings/arm/coresight.txt +++ b/Documentation/devicetree/bindings/arm/coresight.txt @@ -17,6 +17,7 @@ its hardware characteristcs. - "arm,coresight-tmc", "arm,primecell"; - "arm,coresight-funnel", "arm,primecell"; - "arm,coresight-etm3x", "arm,primecell"; + - "qcom,coresight-replicator1x", "arm,primecell"; * reg: physical base address and length of the register set(s) of the component. diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index 8fac01eedee7..6c8921140f02 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -69,4 +69,12 @@ config CORESIGHT_SOURCE_ETM4X for instruction level tracing. Depending on the implemented version data tracing may also be available. +config CORESIGHT_QCOM_REPLICATOR + bool "Qualcomm CoreSight Replicator driver" + depends on CORESIGHT_LINKS_AND_SINKS + help + This enables support for Qualcomm CoreSight link driver. The + programmable ATB replicator sends the ATB trace stream from the + ETB/ETF to the TPIUi and ETR. + endif diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index 0af28d43465c..99f8e5f6256e 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -10,3 +10,4 @@ obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o \ coresight-replicator.o obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o coresight-etm-cp14.o obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o +obj-$(CONFIG_CORESIGHT_QCOM_REPLICATOR) += coresight-replicator-qcom.o diff --git a/drivers/hwtracing/coresight/coresight-replicator-qcom.c b/drivers/hwtracing/coresight/coresight-replicator-qcom.c new file mode 100644 index 000000000000..deacea49af36 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-replicator-qcom.c @@ -0,0 +1,214 @@ +/* + * Copyright (c) 2011-2015, 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "coresight-priv.h" + +#define REPLICATOR_IDFILTER0 0x000 +#define REPLICATOR_IDFILTER1 0x004 + +/** + * struct replicator_state - specifics associated to a replicator component + * @base: memory mapped base address for this component. + * @dev: the device entity associated with this component + * @atclk: optional clock for the core parts of the replicator. + * @csdev: component vitals needed by the framework + */ +struct replicator_state { + void __iomem *base; + struct device *dev; + struct clk *atclk; + struct coresight_device *csdev; +}; + +static int replicator_enable(struct coresight_device *csdev, int inport, + int outport) +{ + struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent); + + pm_runtime_get_sync(drvdata->dev); + + CS_UNLOCK(drvdata->base); + + /* + * Ensure that the other port is disabled + * 0x00 - passing through the replicator unimpeded + * 0xff - disable (or impede) the flow of ATB data + */ + if (outport == 0) { + writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0); + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); + } else { + writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1); + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); + } + + CS_LOCK(drvdata->base); + + dev_info(drvdata->dev, "REPLICATOR enabled\n"); + return 0; +} + +static void replicator_disable(struct coresight_device *csdev, int inport, + int outport) +{ + struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent); + + CS_UNLOCK(drvdata->base); + + /* disable the flow of ATB data through port */ + if (outport == 0) + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); + else + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); + + CS_LOCK(drvdata->base); + + pm_runtime_put(drvdata->dev); + + dev_info(drvdata->dev, "REPLICATOR disabled\n"); +} + +static const struct coresight_ops_link replicator_link_ops = { + .enable = replicator_enable, + .disable = replicator_disable, +}; + +static const struct coresight_ops replicator_cs_ops = { + .link_ops = &replicator_link_ops, +}; + +static int replicator_probe(struct amba_device *adev, const struct amba_id *id) +{ + int ret; + struct device *dev = &adev->dev; + struct resource *res = &adev->res; + struct coresight_platform_data *pdata = NULL; + struct replicator_state *drvdata; + struct coresight_desc *desc; + struct device_node *np = adev->dev.of_node; + void __iomem *base; + + if (np) { + pdata = of_get_coresight_platform_data(dev, np); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + adev->dev.platform_data = pdata; + } + + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->dev = &adev->dev; + drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */ + if (!IS_ERR(drvdata->atclk)) { + ret = clk_prepare_enable(drvdata->atclk); + if (ret) + return ret; + } + + /* Validity for the resource is already checked by the AMBA core */ + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + drvdata->base = base; + dev_set_drvdata(dev, drvdata); + pm_runtime_put(&adev->dev); + + desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); + if (!desc) + return -ENOMEM; + + desc->type = CORESIGHT_DEV_TYPE_LINK; + desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT; + desc->ops = &replicator_cs_ops; + desc->pdata = adev->dev.platform_data; + desc->dev = &adev->dev; + drvdata->csdev = coresight_register(desc); + if (IS_ERR(drvdata->csdev)) + return PTR_ERR(drvdata->csdev); + + dev_info(dev, "%s initialized\n", (char *)id->data); + return 0; +} + +static int replicator_remove(struct amba_device *adev) +{ + struct replicator_state *drvdata = amba_get_drvdata(adev); + + pm_runtime_disable(&adev->dev); + coresight_unregister(drvdata->csdev); + return 0; +} + +#ifdef CONFIG_PM +static int replicator_runtime_suspend(struct device *dev) +{ + struct replicator_state *drvdata = dev_get_drvdata(dev); + + if (drvdata && !IS_ERR(drvdata->atclk)) + clk_disable_unprepare(drvdata->atclk); + + return 0; +} + +static int replicator_runtime_resume(struct device *dev) +{ + struct replicator_state *drvdata = dev_get_drvdata(dev); + + if (drvdata && !IS_ERR(drvdata->atclk)) + clk_prepare_enable(drvdata->atclk); + + return 0; +} +#endif + +static const struct dev_pm_ops replicator_dev_pm_ops = { + SET_RUNTIME_PM_OPS(replicator_runtime_suspend, + replicator_runtime_resume, + NULL) +}; + +static struct amba_id replicator_ids[] = { + { + .id = 0x0003b909, + .mask = 0x0003ffff, + .data = "REPLICATOR 1.0", + }, + { 0, 0 }, +}; + +static struct amba_driver replicator_driver = { + .drv = { + .name = "coresight-replicator-qcom", + .pm = &replicator_dev_pm_ops, + }, + .probe = replicator_probe, + .remove = replicator_remove, + .id_table = replicator_ids, +}; + +module_amba_driver(replicator_driver); -- 2.20.1