From patchwork Thu May 7 15:36:08 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Ivan T. Ivanov" X-Patchwork-Id: 6359161 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 97CB0BEEE1 for ; Thu, 7 May 2015 15:39:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 70A4B20364 for ; Thu, 7 May 2015 15:39:42 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4F22520361 for ; Thu, 7 May 2015 15:39:41 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YqNre-0007yl-MB; Thu, 07 May 2015 15:37:30 +0000 Received: from mail-wg0-f51.google.com ([74.125.82.51]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YqNqv-0007ZB-CK for linux-arm-kernel@lists.infradead.org; Thu, 07 May 2015 15:36:48 +0000 Received: by wgin8 with SMTP id n8so47526508wgi.0 for ; Thu, 07 May 2015 08:36:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=UmusqMyJMrDWhiUTmic8SXgzx7XCZOhZ3Ms+IgA8wGY=; b=mG8ApHPI9nRya9zqxDiyQiBcUIR6rA3M1kbTc6xCog3VH4Av8J/PggE0ItSiDjlb+x q93xXUolTrkLi7W/rG34eppPlAvUSuKZzo5tD1/bdr3J+8ExCDpA5P5YsjlWMo/JQiih R6XPbrB18vmksrLHGiAeSvH/fD2dS7si4VjMrOzysIiGMyXsEXd3fSUUNZXRppkBWabc Fz+6LUA0mo+uyw9lbmi0lNvY8alSf6L8sXZ0IXWFFry9qwy44Za4QI8rFp7BcZWtkQLl L8yvoJkqL8rjRQk4JaOmeNGSEHQ5gNGcyHw8DAmveYduO4eykJDpFziwkLqZb68Y+kQF ADTQ== X-Gm-Message-State: ALoCoQm6rokO659kYYheaealN9FNDYs+uEo3qwJp1NVf7caepHwVTKZ+pXQp7Ps2n3iGF0g0HVB0 X-Received: by 10.194.172.72 with SMTP id ba8mr8736656wjc.136.1431012983055; Thu, 07 May 2015 08:36:23 -0700 (PDT) Received: from mms-0439.wifi.mm-sol.com ([37.157.136.206]) by mx.google.com with ESMTPSA id gj7sm7991588wib.4.2015.05.07.08.36.21 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 07 May 2015 08:36:22 -0700 (PDT) From: "Ivan T. Ivanov" To: Mathieu Poirier , Kumar Gala Subject: [PATCH v2 1/2] coresight: replicator: Add Qualcomm CoreSight Replicator driver Date: Thu, 7 May 2015 18:36:08 +0300 Message-Id: <1431012969-16338-2-git-send-email-ivan.ivanov@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1431012969-16338-1-git-send-email-ivan.ivanov@linaro.org> References: <1431012969-16338-1-git-send-email-ivan.ivanov@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150507_083645_798756_727967FC X-CRM114-Status: GOOD ( 20.62 ) X-Spam-Score: -0.7 (/) Cc: Mark Rutland , devicetree@vger.kernel.org, Pawel Moll , Ian Campbell , Catalin Marinas , Will Deacon , linux-kernel@vger.kernel.org, Rob Herring , linux-arm-msm@vger.kernel.org, Pratik Patel , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Pratik Patel 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 --- .../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 -- 1.9.1 diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt index f4d6a86..661a1be 100644 --- a/Documentation/devicetree/bindings/arm/coresight.txt +++ b/Documentation/devicetree/bindings/arm/coresight.txt @@ -18,6 +18,7 @@ its hardware characteristcs. - "arm,coresight-funnel", "arm,primecell"; - "arm,coresight-etm3x", "arm,primecell"; - "arm,coresight-etm4x", "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 6b331d4..a57a51d 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -68,4 +68,12 @@ config CORESIGHT_SOURCE_ETM4X instructions that a processor is executing. This is primarily useful for instruction level tracing. Depending on the implemented version data tracing may also be available. + +config CORESIGHT_QCOM_REPLICATOR + bool "Qualcomm CoreSight Replicator driver" + help + This enables support for Qualcomm CoreSight link driver. The programmable + ATB replicator sends the ATB trace stream from the ETB/ETF to the TPIU + and ETR. + endif diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index 0af28d4..99f8e5f 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 0000000..deacea4 --- /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);