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Diffstat (limited to 'Documentation/arm/keystone')
| -rw-r--r-- | Documentation/arm/keystone/knav-qmss.txt | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Documentation/arm/keystone/knav-qmss.txt b/Documentation/arm/keystone/knav-qmss.txt new file mode 100644 index 000000000000..79946d184d76 --- /dev/null +++ b/Documentation/arm/keystone/knav-qmss.txt @@ -0,0 +1,24 @@ +* Texas Instruments Keystone Navigator Queue Management SubSystem driver + +Driver source code path + drivers/soc/ti/knav_qmss.c + drivers/soc/ti/knav_qmss_acc.c + +The QMSS (Queue Manager Sub System) found on Keystone SOCs is one of +the main hardware sub system which forms the backbone of the Keystone +multi-core Navigator. QMSS consist of queue managers, packed-data structure +processors(PDSP), linking RAM, descriptor pools and infrastructure +Packet DMA. +The Queue Manager is a hardware module that is responsible for accelerating +management of the packet queues. Packets are queued/de-queued by writing or +reading descriptor address to a particular memory mapped location. The PDSPs +perform QMSS related functions like accumulation, QoS, or event management. +Linking RAM registers are used to link the descriptors which are stored in +descriptor RAM. Descriptor RAM is configurable as internal or external memory. +The QMSS driver manages the PDSP setups, linking RAM regions, +queue pool management (allocation, push, pop and notify) and descriptor +pool management. + +knav qmss driver provides a set of APIs to drivers to open/close qmss queues, +allocate descriptor pools, map the descriptors, push/pop to queues etc. For +details of the available APIs, please refers to include/linux/soc/ti/knav_qmss.h |