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| author |  Suzuki K Poulose <suzuki.poulose@arm.com>
| 2018-09-20 13:18:11 -0600 |
|---|---|---|
| committer |  Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| 2018-09-25 20:09:19 +0200 |
| commit | 2478a6ae4a6a4c8e3f7e9f6f849dffe92e5238e1 (patch) | |
| tree | c1250692bc7cf6a36e6ecd3da9c5b141d9050e0f /drivers/hwtracing/coresight/coresight-priv.h | |
| parent | coresight: dynamic-replicator: Handle multiple connections (diff) | |
| download | linux-2478a6ae4a6a4c8e3f7e9f6f849dffe92e5238e1.tar.gz linux-2478a6ae4a6a4c8e3f7e9f6f849dffe92e5238e1.tar.bz2 linux-2478a6ae4a6a4c8e3f7e9f6f849dffe92e5238e1.zip | |
coresight: Add support for CLAIM tag protocol
Coresight architecture defines CLAIM tags for a device to negotiate
control of the components (external agent vs self-hosted). Each device
has a pair of registers (CLAIMSET & CLAIMCLR) for managing the CLAIM
tags. However, the protocol for the CLAIM tags is IMPLEMENTATION DEFINED.
PSCI has recommendations for the use of the CLAIM tags to negotiate
controls for external agent vs self-hosted use. This patch implements
the recommended protocol by PSCI.
The claim/disclaim operations are performed from the device specific
drivers. The disadvantage is that the calls are sprinkled in each driver,
but this makes the operation much simpler.
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-priv.h')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-priv.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index c11da5564a67..579f34943bf1 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -25,6 +25,13 @@ #define CORESIGHT_DEVID 0xfc8 #define CORESIGHT_DEVTYPE 0xfcc + +/* + * Coresight device CLAIM protocol. + * See PSCI - ARM DEN 0022D, Section: 6.8.1 Debug and Trace save and restore. + */ +#define CORESIGHT_CLAIM_SELF_HOSTED BIT(1) + #define TIMEOUT_US 100 #define BMVAL(val, lsb, msb) ((val & GENMASK(msb, lsb)) >> lsb) |