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From:   Tingwei Zhang <tingwei@codeaurora.org>
To:     Mathieu Poirier <mathieu.poirier@linaro.org>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Mike Leach <mike.leach@linaro.org>
Cc:     Kim Phillips <kim.phillips@arm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Leo Yan <leo.yan@linaro.org>,
        Randy Dunlap <rdunlap@infradead.org>,
        Russell King <linux@armlinux.org.uk>,
        Mian Yousaf Kaukab <ykaukab@suse.de>, tsoni@codeaurora.org,
        Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
        Mao Jinlong <jinlmao@codeaurora.org>,
        coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org,
        Suzuki K Poulose <Suzuki.Poulose@arm.com>,
        Tingwei Zhang <tingwei@codeaurora.org>
Subject: [PATCH v9 14/24] coresight: allow funnel driver to be built as module
Date:   Thu, 20 Aug 2020 13:47:08 +0800
Message-Id: <20200820054718.20115-15-tingwei@codeaurora.org>
In-Reply-To: <20200820054718.20115-1-tingwei@codeaurora.org>
References: <20200820054718.20115-1-tingwei@codeaurora.org>
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From: Kim Phillips <kim.phillips@arm.com>

Allow to build coresight-funnel as module, for ease of development.

- combine static and dynamic funnel init into single
  module_init/exit call
- add funnel_remove functions, for module unload
- add a MODULE_DEVICE_TABLE for autoloading on boot

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russell King <linux@armlinux.org.uk>
Co-developed-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Tested-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 .../hwtracing/coresight/coresight-funnel.c    | 64 ++++++++++++++++++-
 1 file changed, 62 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index 900690a9f7f0..38e0079bd494 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -274,6 +274,15 @@ static int funnel_probe(struct device *dev, struct resource *res)
 	return ret;
 }
 
+static int __exit funnel_remove(struct device *dev)
+{
+	struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
+
+	coresight_unregister(drvdata->csdev);
+
+	return 0;
+}
+
 #ifdef CONFIG_PM
 static int funnel_runtime_suspend(struct device *dev)
 {
@@ -319,20 +328,32 @@ static int static_funnel_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int __exit static_funnel_remove(struct platform_device *pdev)
+{
+	funnel_remove(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	return 0;
+}
+
 static const struct of_device_id static_funnel_match[] = {
 	{.compatible = "arm,coresight-static-funnel"},
 	{}
 };
 
+MODULE_DEVICE_TABLE(of, static_funnel_match);
+
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id static_funnel_ids[] = {
 	{"ARMHC9FE", 0},
 	{},
 };
+
+MODULE_DEVICE_TABLE(acpi, static_funnel_ids);
 #endif
 
 static struct platform_driver static_funnel_driver = {
 	.probe          = static_funnel_probe,
+	.probe          = static_funnel_remove,
 	.driver         = {
 		.name   = "coresight-static-funnel",
 		.of_match_table = static_funnel_match,
@@ -341,7 +362,6 @@ static struct platform_driver static_funnel_driver = {
 		.suppress_bind_attrs = true,
 	},
 };
-builtin_platform_driver(static_funnel_driver);
 
 static int dynamic_funnel_probe(struct amba_device *adev,
 				const struct amba_id *id)
@@ -349,6 +369,11 @@ static int dynamic_funnel_probe(struct amba_device *adev,
 	return funnel_probe(&adev->dev, &adev->res);
 }
 
+static int __exit dynamic_funnel_remove(struct amba_device *adev)
+{
+	return funnel_remove(&adev->dev);
+}
+
 static const struct amba_id dynamic_funnel_ids[] = {
 	{
 		.id     = 0x000bb908,
@@ -362,6 +387,8 @@ static const struct amba_id dynamic_funnel_ids[] = {
 	{ 0, 0},
 };
 
+MODULE_DEVICE_TABLE(amba, dynamic_funnel_ids);
+
 static struct amba_driver dynamic_funnel_driver = {
 	.drv = {
 		.name	= "coresight-dynamic-funnel",
@@ -370,6 +397,39 @@ static struct amba_driver dynamic_funnel_driver = {
 		.suppress_bind_attrs = true,
 	},
 	.probe		= dynamic_funnel_probe,
+	.remove		= dynamic_funnel_remove,
 	.id_table	= dynamic_funnel_ids,
 };
-builtin_amba_driver(dynamic_funnel_driver);
+
+static int __init funnel_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&static_funnel_driver);
+	if (ret) {
+		pr_info("Error registering platform driver\n");
+		return ret;
+	}
+
+	ret = amba_driver_register(&dynamic_funnel_driver);
+	if (ret) {
+		pr_info("Error registering amba driver\n");
+		platform_driver_unregister(&static_funnel_driver);
+	}
+
+	return ret;
+}
+
+static void __exit funnel_exit(void)
+{
+	platform_driver_unregister(&static_funnel_driver);
+	amba_driver_unregister(&dynamic_funnel_driver);
+}
+
+module_init(funnel_init);
+module_exit(funnel_exit);
+
+MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
+MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
+MODULE_DESCRIPTION("Arm CoreSight Funnel Driver");
+MODULE_LICENSE("GPL v2");
-- 
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