From patchwork Thu Sep 21 04:20:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 13393633 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EE405CD494C for ; Thu, 21 Sep 2023 04:21:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=p70CzXXx+GxQogf7bI4gp/dgKl8HyUZtbc6wppsdfkw=; b=SK8HZs5yoZ0B0L JMcXaP5l4uPUEdZqui0SExPl7Y0XFwlxsoK+F8map9IwqoFfpW0UcdLhzvutJvLhAD67Ao2RVSwaE MuWBRom1AwgFJ7k+O9lrnCwngeW6NB7JoQIKzIYzXVaTlCC2BYrm2TeheX8muKw7xkOVi0kKIB2Ko hz1+52YS8WZX3Y7s37msXBCC93t9tylOEbZ2rQ3DFOOdUa2FvCiVEG6rNi0XO6f14r5YCU+5VGkG4 6FDSPP6Nzkqm7cxid3GslSMAvMGUxSsfdlniSBNowPgNj9XqFU9f7PToWYfZL7c63jtlrvjdmSJoJ x93FnjMUcldK3r7R325g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qjBBq-0052H0-18; Thu, 21 Sep 2023 04:21:22 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qjBBc-0052CP-2t for linux-arm-kernel@lists.infradead.org; Thu, 21 Sep 2023 04:21:11 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CDAA1143D; Wed, 20 Sep 2023 21:21:43 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.32.120]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 40F913F59C; Wed, 20 Sep 2023 21:21:04 -0700 (PDT) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org, suzuki.poulose@arm.com Cc: Anshuman Khandual , James Clark , Mike Leach , coresight@lists.linaro.org, linux-kernel@vger.kernel.org Subject: [RFC RESEND 4/7] coresight: tpiu: Move ACPI support from AMBA driver to platform driver Date: Thu, 21 Sep 2023 09:50:37 +0530 Message-Id: <20230921042040.1334641-5-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230921042040.1334641-1-anshuman.khandual@arm.com> References: <20230921042040.1334641-1-anshuman.khandual@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230920_212109_029974_82B5D2F6 X-CRM114-Status: GOOD ( 22.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add support for the tpiu device in the platform driver, which can then be used on ACPI based platforms. This change would now allow runtime power management for ACPI based systems. The driver would try to enable the APB clock if available. Signed-off-by: Anshuman Khandual --- drivers/acpi/arm64/amba.c | 1 - drivers/hwtracing/coresight/coresight-tpiu.c | 76 ++++++++++++++++++-- 2 files changed, 69 insertions(+), 8 deletions(-) diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c index 56a7e020555b..8e1783166c33 100644 --- a/drivers/acpi/arm64/amba.c +++ b/drivers/acpi/arm64/amba.c @@ -25,7 +25,6 @@ static const struct acpi_device_id amba_id_list[] = { {"ARMHC501", 0}, /* ARM CoreSight ETR */ {"ARMHC502", 0}, /* ARM CoreSight STM */ {"ARMHC503", 0}, /* ARM CoreSight Debug */ - {"ARMHC979", 0}, /* ARM CoreSight TPIU */ {"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */ {"", 0}, }; diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c index 59eac93fd6bb..9835a79c036e 100644 --- a/drivers/hwtracing/coresight/coresight-tpiu.c +++ b/drivers/hwtracing/coresight/coresight-tpiu.c @@ -5,6 +5,8 @@ * Description: CoreSight Trace Port Interface Unit driver */ +#include +#include #include #include #include @@ -57,6 +59,7 @@ DEFINE_CORESIGHT_DEVLIST(tpiu_devs, "tpiu"); struct tpiu_drvdata { void __iomem *base; struct clk *atclk; + struct clk *pclk; struct coresight_device *csdev; }; @@ -114,14 +117,12 @@ static const struct coresight_ops tpiu_cs_ops = { .sink_ops = &tpiu_sink_ops, }; -static int tpiu_probe(struct amba_device *adev, const struct amba_id *id) +static int __tpiu_probe(struct device *dev, struct resource *res) { int ret; void __iomem *base; - struct device *dev = &adev->dev; struct coresight_platform_data *pdata = NULL; struct tpiu_drvdata *drvdata; - struct resource *res = &adev->res; struct coresight_desc desc = { 0 }; desc.name = coresight_alloc_device_name(&tpiu_devs, dev); @@ -132,12 +133,16 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id) if (!drvdata) return -ENOMEM; - drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */ + drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */ if (!IS_ERR(drvdata->atclk)) { ret = clk_prepare_enable(drvdata->atclk); if (ret) return ret; } + + drvdata->pclk = coresight_get_enable_apb_pclk(dev); + if (IS_ERR(drvdata->pclk)) + return -ENODEV; dev_set_drvdata(dev, drvdata); /* Validity for the resource is already checked by the AMBA core */ @@ -164,20 +169,30 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id) drvdata->csdev = coresight_register(&desc); if (!IS_ERR(drvdata->csdev)) { - pm_runtime_put(&adev->dev); + pm_runtime_put(dev); return 0; } return PTR_ERR(drvdata->csdev); } -static void tpiu_remove(struct amba_device *adev) +static int tpiu_probe(struct amba_device *adev, const struct amba_id *id) { - struct tpiu_drvdata *drvdata = dev_get_drvdata(&adev->dev); + return __tpiu_probe(&adev->dev, &adev->res); +} + +static void __tpiu_remove(struct device *dev) +{ + struct tpiu_drvdata *drvdata = dev_get_drvdata(dev); coresight_unregister(drvdata->csdev); } +static void tpiu_remove(struct amba_device *adev) +{ + __tpiu_remove(&adev->dev); +} + #ifdef CONFIG_PM static int tpiu_runtime_suspend(struct device *dev) { @@ -186,6 +201,8 @@ static int tpiu_runtime_suspend(struct device *dev) if (drvdata && !IS_ERR(drvdata->atclk)) clk_disable_unprepare(drvdata->atclk); + if (drvdata && !IS_ERR(drvdata->pclk)) + clk_disable_unprepare(drvdata->pclk); return 0; } @@ -196,6 +213,8 @@ static int tpiu_runtime_resume(struct device *dev) if (drvdata && !IS_ERR(drvdata->atclk)) clk_prepare_enable(drvdata->atclk); + if (drvdata && !IS_ERR(drvdata->pclk)) + clk_prepare_enable(drvdata->pclk); return 0; } #endif @@ -237,6 +256,49 @@ static struct amba_driver tpiu_driver = { module_amba_driver(tpiu_driver); +static int tpiu_platform_probe(struct platform_device *pdev) +{ + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + int ret; + + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + ret = __tpiu_probe(&pdev->dev, res); + if (ret) { + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + } + return ret; +} + +static int tpiu_platform_remove(struct platform_device *pdev) +{ + __tpiu_remove(&pdev->dev); + return 0; +} + +#ifdef CONFIG_ACPI +static const struct acpi_device_id tpiu_acpi_ids[] = { + {"ARMHC979", 0}, /* ARM CoreSight TPIU */ + {} +}; +MODULE_DEVICE_TABLE(acpi, tpiu_acpi_ids); +#endif + +static struct platform_driver tpiu_platform_driver = { + .probe = tpiu_platform_probe, + .remove = tpiu_platform_remove, + .driver = { + .name = "coresight-tpiu-platform", + .acpi_match_table = ACPI_PTR(tpiu_acpi_ids), + .suppress_bind_attrs = true, + .pm = &tpiu_dev_pm_ops, + }, +}; +module_platform_driver(tpiu_platform_driver); + MODULE_AUTHOR("Pratik Patel "); MODULE_AUTHOR("Mathieu Poirier "); MODULE_DESCRIPTION("Arm CoreSight TPIU (Trace Port Interface Unit) driver");