From patchwork Thu Mar 14 05:58:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 780305 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6991250A60; Thu, 14 Mar 2024 06:00:07 +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=1710396009; cv=none; b=mm/lSklk6v6ZYkf2uYgizsQQrRULoVQizkrd6kJZxRvqIquVg+luU2LrcuKz5th8FKWQu8/dc3enKUSlnAJXWfyFtgiqrttBI6Z1flSnPR0OhYgAO8WSVx17dg9mMPq+rMUNLn0uE5l4F60qvrwJ06lcd1urH0txBe7670B4WgA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710396009; c=relaxed/simple; bh=moazgtcuMucKciWmHM/NiV2lvzyaSuRx4XTjZfq4/fw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=gW+ILBXa+8OfFk5h5n6AORkQtLaQRkskdbosnc8qQFXqzIupCIdt2nA1IrD7tyCq3vLg/oFxqI2MQIkl1Mnmc71Tt+fJv3yO0x88h/F74HbjRNMl/2skBTfbU8ZLbgK2sM1rvuRvjdX6hyTZGdJwMJOuE1C7kfy051PDc6rODDg= 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 C63C11007; Wed, 13 Mar 2024 23:00:42 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.53.138]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id E59F63F73F; Wed, 13 Mar 2024 23:00:01 -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 10/11] coresight: stm: Move ACPI support from AMBA driver to platform driver Date: Thu, 14 Mar 2024 11:28:42 +0530 Message-Id: <20240314055843.2625883-11-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 stm devices 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. But first this renames and then refactors stm_probe() and stm_remove(), making sure it can be used both for platform and AMBA drivers. Also this moves pm_runtime_put() from stm_probe() to the callers. Cc: Lorenzo Pieralisi Cc: Sudeep Holla Cc: Suzuki K Poulose Cc: Mike Leach Cc: James Clark Cc: Maxime Coquelin Cc: Alexandre Torgue Cc: linux-acpi@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: coresight@lists.linaro.org Cc: linux-stm32@st-md-mailman.stormreply.com Tested-by: Sudeep Holla # Boot and driver probe only Acked-by: Sudeep Holla # For ACPI related changes Reviewed-by: James Clark Signed-off-by: Anshuman Khandual --- Changes in V7: - Dropped reduntant drvdata check in stm_platform_remove() drivers/acpi/arm64/amba.c | 1 - drivers/hwtracing/coresight/coresight-stm.c | 104 ++++++++++++++++++-- 2 files changed, 94 insertions(+), 11 deletions(-) diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c index d3c1defa7bc8..bec0976541da 100644 --- a/drivers/acpi/arm64/amba.c +++ b/drivers/acpi/arm64/amba.c @@ -22,7 +22,6 @@ static const struct acpi_device_id amba_id_list[] = { {"ARMH0061", 0}, /* PL061 GPIO Device */ {"ARMH0330", 0}, /* ARM DMA Controller DMA-330 */ - {"ARMHC502", 0}, /* ARM CoreSight STM */ {"ARMHC503", 0}, /* ARM CoreSight Debug */ {"", 0}, }; diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c index 5ae24c33c846..cbf7f17556f8 100644 --- a/drivers/hwtracing/coresight/coresight-stm.c +++ b/drivers/hwtracing/coresight/coresight-stm.c @@ -29,6 +29,8 @@ #include #include #include +#include +#include #include "coresight-priv.h" #include "coresight-trace-id.h" @@ -115,6 +117,7 @@ DEFINE_CORESIGHT_DEVLIST(stm_devs, "stm"); * struct stm_drvdata - specifics associated to an STM component * @base: memory mapped base address for this component. * @atclk: optional clock for the core parts of the STM. + * @pclk: APB clock if present, otherwise NULL * @csdev: component vitals needed by the framework. * @spinlock: only one at a time pls. * @chs: the channels accociated to this STM. @@ -131,6 +134,7 @@ DEFINE_CORESIGHT_DEVLIST(stm_devs, "stm"); struct stm_drvdata { void __iomem *base; struct clk *atclk; + struct clk *pclk; struct coresight_device *csdev; spinlock_t spinlock; struct channel_space chs; @@ -810,14 +814,12 @@ static char *stm_csdev_name(struct coresight_device *csdev) return uci_data ? (char *)uci_data : "STM"; } -static int stm_probe(struct amba_device *adev, const struct amba_id *id) +static int __stm_probe(struct device *dev, struct resource *res) { int ret, trace_id; void __iomem *base; - struct device *dev = &adev->dev; struct coresight_platform_data *pdata = NULL; struct stm_drvdata *drvdata; - struct resource *res = &adev->res; struct resource ch_res; struct coresight_desc desc = { 0 }; @@ -829,12 +831,16 @@ static int stm_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); base = devm_ioremap_resource(dev, res); @@ -882,7 +888,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id) ret = PTR_ERR(pdata); goto stm_unregister; } - adev->dev.platform_data = pdata; + dev->platform_data = pdata; desc.type = CORESIGHT_DEV_TYPE_SOURCE; desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE; @@ -903,8 +909,6 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id) } drvdata->traceid = (u8)trace_id; - pm_runtime_put(&adev->dev); - dev_info(&drvdata->csdev->dev, "%s initialized\n", stm_csdev_name(drvdata->csdev)); return 0; @@ -917,9 +921,20 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id) return ret; } -static void stm_remove(struct amba_device *adev) +static int stm_probe(struct amba_device *adev, const struct amba_id *id) +{ + int ret; + + ret = __stm_probe(&adev->dev, &adev->res); + if (!ret) + pm_runtime_put(&adev->dev); + + return ret; +} + +static void __stm_remove(struct device *dev) { - struct stm_drvdata *drvdata = dev_get_drvdata(&adev->dev); + struct stm_drvdata *drvdata = dev_get_drvdata(dev); coresight_trace_id_put_system_id(drvdata->traceid); coresight_unregister(drvdata->csdev); @@ -927,6 +942,11 @@ static void stm_remove(struct amba_device *adev) stm_unregister_device(&drvdata->stm); } +static void stm_remove(struct amba_device *adev) +{ + __stm_remove(&adev->dev); +} + #ifdef CONFIG_PM static int stm_runtime_suspend(struct device *dev) { @@ -935,6 +955,8 @@ static int stm_runtime_suspend(struct device *dev) if (drvdata && !IS_ERR(drvdata->atclk)) clk_disable_unprepare(drvdata->atclk); + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk)) + clk_disable_unprepare(drvdata->pclk); return 0; } @@ -945,6 +967,8 @@ static int stm_runtime_resume(struct device *dev) if (drvdata && !IS_ERR(drvdata->atclk)) clk_prepare_enable(drvdata->atclk); + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk)) + clk_prepare_enable(drvdata->pclk); return 0; } #endif @@ -973,7 +997,67 @@ static struct amba_driver stm_driver = { .id_table = stm_ids, }; -module_amba_driver(stm_driver); +static int stm_platform_probe(struct platform_device *pdev) +{ + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + int ret = 0; + + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + ret = __stm_probe(&pdev->dev, res); + pm_runtime_put(&pdev->dev); + if (ret) + pm_runtime_disable(&pdev->dev); + + return ret; +} + +static int stm_platform_remove(struct platform_device *pdev) +{ + struct stm_drvdata *drvdata = dev_get_drvdata(&pdev->dev); + + if (WARN_ON(!drvdata)) + return -ENODEV; + + __stm_remove(&pdev->dev); + pm_runtime_disable(&pdev->dev); + if (!IS_ERR_OR_NULL(drvdata->pclk)) + clk_put(drvdata->pclk); + return 0; +} + +#ifdef CONFIG_ACPI +static const struct acpi_device_id stm_acpi_ids[] = { + {"ARMHC502", 0, 0, 0}, /* ARM CoreSight STM */ + {}, +}; +MODULE_DEVICE_TABLE(acpi, stm_acpi_ids); +#endif + +static struct platform_driver stm_platform_driver = { + .probe = stm_platform_probe, + .remove = stm_platform_remove, + .driver = { + .name = "coresight-stm-platform", + .acpi_match_table = ACPI_PTR(stm_acpi_ids), + .suppress_bind_attrs = true, + .pm = &stm_dev_pm_ops, + }, +}; + +static int __init stm_init(void) +{ + return coresight_init_driver("stm", &stm_driver, &stm_platform_driver); +} + +static void __exit stm_exit(void) +{ + coresight_remove_driver(&stm_driver, &stm_platform_driver); +} +module_init(stm_init); +module_exit(stm_exit); MODULE_AUTHOR("Pratik Patel "); MODULE_DESCRIPTION("Arm CoreSight System Trace Macrocell driver");