From patchwork Thu Mar 14 05:58:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 13592102 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 990083BB37; Thu, 14 Mar 2024 05:59:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710395993; cv=none; b=bOOj9Cr6d0i18ptbDTaXoSIxTeFGKCdH3znXq5rAa0B6cpbCSvgz/nSySxiUAVgiv0ogjyrUV+Efw30udUAWZGnR6BR7BogodKVdH8fEAnWFQGS4iDP72UXBK0ouzEwiyOI4wHRQ8ZxUioqaNJfIKyYRbGTfC33/vU1+tZfgoC4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710395993; c=relaxed/simple; bh=/ynXK/wwo6vxgSvodH8Qphiw9crFmPIhTLqhJ1xqsnI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=cUn5ODBN+KTxTy9m4dqyaYxjISsB0iwKgrBZD/e8STwTOSEwPyayPddWL0qKe+9z4Vj2TFJ/3EcYOMNj4C90j04x8EwVi66Koe8EIzVi4O6QFbffPNSa9NfiUDKee43A8AUDXFdZvBRJOyALlt4EYkMSZyz2NEiA0KbgPUet0Is= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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 646A01007; Wed, 13 Mar 2024 23:00:27 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.53.138]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 02F203F73F; Wed, 13 Mar 2024 22:59:46 -0700 (PDT) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org, suzuki.poulose@arm.com Cc: Anshuman Khandual , Lorenzo Pieralisi , Sudeep Holla , Mike Leach , James Clark , Maxime Coquelin , Alexandre Torgue , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-stm32@st-md-mailman.stormreply.com Subject: [PATCH V7 07/11] coresight: catu: Move ACPI support from AMBA driver to platform driver Date: Thu, 14 Mar 2024 11:28:39 +0530 Message-Id: <20240314055843.2625883-8-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240314055843.2625883-1-anshuman.khandual@arm.com> References: <20240314055843.2625883-1-anshuman.khandual@arm.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add support for the catu devices in a new 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. But first this renames and then refactors catu_probe() and catu_remove(), making sure it can be used both for platform and AMBA drivers. This also moves pm_runtime_put() from catu_probe() to the callers. Cc: Lorenzo Pieralisi Cc: Sudeep Holla Cc: Suzuki K Poulose Cc: Mike Leach Cc: James Clark Cc: linux-acpi@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: coresight@lists.linaro.org Acked-by: Sudeep Holla # For ACPI related changes Reviewed-by: James Clark Signed-off-by: Anshuman Khandual --- Changes in V7: - Dropped struct resource check before devm_ioremap_resource() - Dropped reduntant drvdata check in catu_platform_probe() - Dropped reduntant drvdata check in catu_platform_remove() - Sorted the headers in alphabetic order drivers/acpi/arm64/amba.c | 1 - drivers/hwtracing/coresight/coresight-catu.c | 138 ++++++++++++++++--- drivers/hwtracing/coresight/coresight-catu.h | 1 + 3 files changed, 120 insertions(+), 20 deletions(-) diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c index afb6afb66967..587061b0fd2f 100644 --- a/drivers/acpi/arm64/amba.c +++ b/drivers/acpi/arm64/amba.c @@ -27,7 +27,6 @@ static const struct acpi_device_id amba_id_list[] = { {"ARMHC503", 0}, /* ARM CoreSight Debug */ {"ARMHC979", 0}, /* ARM CoreSight TPIU */ {"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */ - {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ {"", 0}, }; diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c index 3949ded0d4fa..9712be6acd26 100644 --- a/drivers/hwtracing/coresight/coresight-catu.c +++ b/drivers/hwtracing/coresight/coresight-catu.c @@ -7,11 +7,13 @@ * Author: Suzuki K Poulose */ +#include #include #include #include #include #include +#include #include #include "coresight-catu.h" @@ -502,28 +504,20 @@ static const struct coresight_ops catu_ops = { .helper_ops = &catu_helper_ops, }; -static int catu_probe(struct amba_device *adev, const struct amba_id *id) +static int __catu_probe(struct device *dev, struct resource *res) { int ret = 0; u32 dma_mask; - struct catu_drvdata *drvdata; + struct catu_drvdata *drvdata = dev_get_drvdata(dev); struct coresight_desc catu_desc; struct coresight_platform_data *pdata = NULL; - struct device *dev = &adev->dev; void __iomem *base; catu_desc.name = coresight_alloc_device_name(&catu_devs, dev); if (!catu_desc.name) return -ENOMEM; - drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); - if (!drvdata) { - ret = -ENOMEM; - goto out; - } - - dev_set_drvdata(dev, drvdata); - base = devm_ioremap_resource(dev, &adev->res); + base = devm_ioremap_resource(dev, res); if (IS_ERR(base)) { ret = PTR_ERR(base); goto out; @@ -567,19 +561,39 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id) drvdata->csdev = coresight_register(&catu_desc); if (IS_ERR(drvdata->csdev)) ret = PTR_ERR(drvdata->csdev); - else - pm_runtime_put(&adev->dev); out: return ret; } -static void catu_remove(struct amba_device *adev) +static int catu_probe(struct amba_device *adev, const struct amba_id *id) { - struct catu_drvdata *drvdata = dev_get_drvdata(&adev->dev); + struct catu_drvdata *drvdata; + int ret; + + drvdata = devm_kzalloc(&adev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + amba_set_drvdata(adev, drvdata); + ret = __catu_probe(&adev->dev, &adev->res); + if (!ret) + pm_runtime_put(&adev->dev); + + return ret; +} + +static void __catu_remove(struct device *dev) +{ + struct catu_drvdata *drvdata = dev_get_drvdata(dev); coresight_unregister(drvdata->csdev); } +static void catu_remove(struct amba_device *adev) +{ + __catu_remove(&adev->dev); +} + static struct amba_id catu_ids[] = { CS_AMBA_ID(0x000bb9ee), {}, @@ -598,13 +612,99 @@ static struct amba_driver catu_driver = { .id_table = catu_ids, }; +static int catu_platform_probe(struct platform_device *pdev) +{ + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + struct catu_drvdata *drvdata; + int ret = 0; + + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->pclk = coresight_get_enable_apb_pclk(&pdev->dev); + if (IS_ERR(drvdata->pclk)) + return -ENODEV; + + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + dev_set_drvdata(&pdev->dev, drvdata); + ret = __catu_probe(&pdev->dev, res); + pm_runtime_put(&pdev->dev); + if (ret) { + pm_runtime_disable(&pdev->dev); + if (!IS_ERR_OR_NULL(drvdata->pclk)) + clk_put(drvdata->pclk); + } + + return ret; +} + +static int catu_platform_remove(struct platform_device *pdev) +{ + struct catu_drvdata *drvdata = dev_get_drvdata(&pdev->dev); + + if (WARN_ON(!drvdata)) + return -ENODEV; + + __catu_remove(&pdev->dev); + pm_runtime_disable(&pdev->dev); + if (!IS_ERR_OR_NULL(drvdata->pclk)) + clk_put(drvdata->pclk); + return 0; +} + +#ifdef CONFIG_PM +static int catu_runtime_suspend(struct device *dev) +{ + struct catu_drvdata *drvdata = dev_get_drvdata(dev); + + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk)) + clk_disable_unprepare(drvdata->pclk); + return 0; +} + +static int catu_runtime_resume(struct device *dev) +{ + struct catu_drvdata *drvdata = dev_get_drvdata(dev); + + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk)) + clk_prepare_enable(drvdata->pclk); + return 0; +} +#endif + +static const struct dev_pm_ops catu_dev_pm_ops = { + SET_RUNTIME_PM_OPS(catu_runtime_suspend, catu_runtime_resume, NULL) +}; + +#ifdef CONFIG_ACPI +static const struct acpi_device_id catu_acpi_ids[] = { + {"ARMHC9CA", 0, 0, 0}, /* ARM CoreSight CATU */ + {}, +}; + +MODULE_DEVICE_TABLE(acpi, catu_acpi_ids); +#endif + +static struct platform_driver catu_platform_driver = { + .probe = catu_platform_probe, + .remove = catu_platform_remove, + .driver = { + .name = "coresight-catu-platform", + .acpi_match_table = ACPI_PTR(catu_acpi_ids), + .suppress_bind_attrs = true, + .pm = &catu_dev_pm_ops, + }, +}; + static int __init catu_init(void) { int ret; - ret = amba_driver_register(&catu_driver); - if (ret) - pr_info("Error registering catu driver\n"); + ret = coresight_init_driver("catu", &catu_driver, &catu_platform_driver); tmc_etr_set_catu_ops(&etr_catu_buf_ops); return ret; } @@ -612,7 +712,7 @@ static int __init catu_init(void) static void __exit catu_exit(void) { tmc_etr_remove_catu_ops(); - amba_driver_unregister(&catu_driver); + coresight_remove_driver(&catu_driver, &catu_platform_driver); } module_init(catu_init); diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h index 442e034bbfba..141feac1c14b 100644 --- a/drivers/hwtracing/coresight/coresight-catu.h +++ b/drivers/hwtracing/coresight/coresight-catu.h @@ -61,6 +61,7 @@ #define CATU_IRQEN_OFF 0x0 struct catu_drvdata { + struct clk *pclk; void __iomem *base; struct coresight_device *csdev; int irq;