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coresight: tmc: Allow tmc to be built as a module

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

- Kconfig becomes a tristate, to allow =m
- append -core to source file name to allow module to
  be called coresight-tmc by the Makefile
- add an tmc_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>
Tested-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200928163513.70169-14-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kim Phillips 2020-09-28 10:35:01 -06:00 committed by Greg Kroah-Hartman
parent d9ed244ef8
commit ecfbf09b1e
3 changed files with 32 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/hwtracing/coresight/Kconfig
View File

@ -25,7 +25,8 @@ config CORESIGHT_LINKS_AND_SINKS
entity at run time to form a complete trace path.
config CORESIGHT_LINK_AND_SINK_TMC
bool "Coresight generic TMC driver"
tristate "Coresight generic TMC driver"
depends on CORESIGHT_LINKS_AND_SINKS
help
This enables support for the Trace Memory Controller driver.
@ -34,6 +35,9 @@ config CORESIGHT_LINK_AND_SINK_TMC
complies with the generic implementation of the component without
special enhancement or added features.
To compile this driver as a module, choose M here: the
module will be called coresight-tmc.
config CORESIGHT_CATU
bool "Coresight Address Translation Unit (CATU) driver"
depends on CORESIGHT_LINK_AND_SINK_TMC

6
drivers/hwtracing/coresight/Makefile
View File

@ -4,9 +4,9 @@
#
obj-$(CONFIG_CORESIGHT) += coresight.o coresight-etm-perf.o \
coresight-platform.o coresight-sysfs.o
obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o \
coresight-tmc-etf.o \
coresight-tmc-etr.o
obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o
coresight-tmc-y := coresight-tmc-core.o coresight-tmc-etf.o \
coresight-tmc-etr.o
obj-$(CONFIG_CORESIGHT_SINK_TPIU) += coresight-tpiu.o
obj-$(CONFIG_CORESIGHT_SINK_ETBV10) += coresight-etb10.o
obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o \

25
drivers/hwtracing/coresight/coresight-tmc.c → drivers/hwtracing/coresight/coresight-tmc-core.c
View File

@ -559,6 +559,21 @@ out:
spin_unlock_irqrestore(&drvdata->spinlock, flags);
}
static int __exit tmc_remove(struct amba_device *adev)
{
struct tmc_drvdata *drvdata = dev_get_drvdata(&adev->dev);
/*
* Since misc_open() holds a refcount on the f_ops, which is
* etb fops in this case, device is there until last file
* handler to this device is closed.
*/
misc_deregister(&drvdata->miscdev);
coresight_unregister(drvdata->csdev);
return 0;
}
static const struct amba_id tmc_ids[] = {
CS_AMBA_ID(0x000bb961),
/* Coresight SoC 600 TMC-ETR/ETS */
@ -570,6 +585,8 @@ static const struct amba_id tmc_ids[] = {
{ 0, 0},
};
MODULE_DEVICE_TABLE(amba, tmc_ids);
static struct amba_driver tmc_driver = {
.drv = {
.name = "coresight-tmc",
@ -578,6 +595,12 @@ static struct amba_driver tmc_driver = {
},
.probe = tmc_probe,
.shutdown = tmc_shutdown,
.remove = tmc_remove,
.id_table = tmc_ids,
};
builtin_amba_driver(tmc_driver);
module_amba_driver(tmc_driver);
MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
MODULE_DESCRIPTION("Arm CoreSight Trace Memory Controller driver");
MODULE_LICENSE("GPL v2");