From: Murali Karicheri Date: Tue, 13 Oct 2015 20:49:04 +0000 (-0700) Subject: Documentation: dt: soc: Add description for knav qmss driver X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=29204a8272aae490a1dd252e48e55ca235c3959c;p=openwrt%2Fstaging%2Fblogic.git Documentation: dt: soc: Add description for knav qmss driver Add documentation for knav qmss driver. Signed-off-by: Murali Karicheri Acked-by: Arnd Bergmann Signed-off-by: Santosh Shilimkar --- 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