[U-Boot] [U-Boot,v4,2/7] soc: ti: k3: add navss ringacc driver

[Tom Rini <trini@konsulko.com>]

On Tue, Feb 05, 2019 at 05:31:22PM +0530, Vignesh R wrote:

> From: Grygorii Strashko <grygorii.strashko@ti.com>
> 
> The Ring Accelerator (RINGACC or RA) provides hardware acceleration to
> enable straightforward passing of work between a producer and a consumer.
> There is one RINGACC module per NAVSS on TI AM65x SoCs.
> 
> The RINGACC converts constant-address read and write accesses to equivalent
> read or write accesses to a circular data structure in memory. The RINGACC
> eliminates the need for each DMA controller which needs to access ring
> elements from having to know the current state of the ring (base address,
> current offset). The DMA controller performs a read or write access to a
> specific address range (which maps to the source interface on the RINGACC)
> and the RINGACC replaces the address for the transaction with a new address
> which corresponds to the head or tail element of the ring (head for reads,
> tail for writes). Since the RINGACC maintains the state, multiple DMA
> controllers or channels are allowed to coherently share the same rings as
> applicable. The RINGACC is able to place data which is destined towards
> software into cached memory directly.
> 
> Supported ring modes:
>  - Ring Mode
>  - Messaging Mode
>  - Credentials Mode
>  - Queue Manager Mode
> 
> TI-SCI integration:
> 
> Texas Instrument's System Control Interface (TI-SCI) Message Protocol now
> has control over Ringacc module resources management (RM) and Rings
> configuration.
> 
> The Ringacc driver manages Rings allocation by itself now and requests
> TI-SCI firmware to allocate and configure specific Rings only. It's done
> this way because, Linux driver implements two stage Rings allocation and
> configuration (allocate ring and configure ring) while TI-SCI Message
> Protocol supports only one combined operation (allocate+configure).
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
> Signed-off-by: Vignesh R <vigneshr@ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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