[PATCH v8 12/24] coresight: tpiu: allow tpiu to be built as a module

Tingwei Zhang
2020-08-07T11:16:21Z

From: Kim Phillips <kim.phillips@arm.com>

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

- Kconfig becomes a tristate, to allow =m
- add a tpiu_remove function, 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>
Signed-off-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
drivers/hwtracing/coresight/Kconfig | 5 ++++-
drivers/hwtracing/coresight/coresight-tpiu.c | 19 ++++++++++++++++++-
2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
index 996d84a1edb8..8fd9887fb03b 100644
--- a/drivers/hwtracing/coresight/Kconfig
+++ b/drivers/hwtracing/coresight/Kconfig
@@ -46,7 +46,7 @@ config CORESIGHT_CATU
mode where the address is not translated.

config CORESIGHT_SINK_TPIU
- bool "Coresight generic TPIU driver"
+ tristate "Coresight generic TPIU driver"
depends on CORESIGHT_LINKS_AND_SINKS
help
This enables support for the Trace Port Interface Unit driver,
@@ -56,6 +56,9 @@ config CORESIGHT_SINK_TPIU
connected to an external host for use case capturing more traces than
the on-board coresight memory can handle.

+ To compile this driver as a module, choose M here: the
+ module will be called coresight-tpiu.
+
config CORESIGHT_SINK_ETBV10
tristate "Coresight ETBv1.0 driver"
depends on CORESIGHT_LINKS_AND_SINKS
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index f8583e4032a6..e4ddd9801535 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -173,6 +173,15 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
return PTR_ERR(drvdata->csdev);
}

+static int __exit tpiu_remove(struct amba_device *adev)
+{
+ struct tpiu_drvdata *drvdata = dev_get_drvdata(&adev->dev);
+
+ coresight_unregister(drvdata->csdev);
+
+ return 0;
+}
+
#ifdef CONFIG_PM
static int tpiu_runtime_suspend(struct device *dev)
{
@@ -216,6 +225,8 @@ static const struct amba_id tpiu_ids[] = {
{ 0, 0},
};

+MODULE_DEVICE_TABLE(amba, tpiu_ids);
+
static struct amba_driver tpiu_driver = {
.drv = {
.name = "coresight-tpiu",
@@ -224,6 +235,12 @@ static struct amba_driver tpiu_driver = {
.suppress_bind_attrs = true,
},
.probe = tpiu_probe,
+ .remove = tpiu_remove,
.id_table = tpiu_ids,
};
-builtin_amba_driver(tpiu_driver);
+module_amba_driver(tpiu_driver);
+
+MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
+MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
+MODULE_DESCRIPTION("Arm CoreSight TPIU (Trace Port Interface Unit) driver");
+MODULE_LICENSE("GPL v2");
--
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