/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
/* Copyright (c) 2023 Imagination Technologies Ltd. */
#ifndef PVR_ROGUE_FWIF_STREAM_H
#define PVR_ROGUE_FWIF_STREAM_H
/**
* DOC: Streams
*
* Commands are submitted to the kernel driver in the form of streams.
*
* A command stream has the following layout :
* - A 64-bit header containing:
* * A u32 containing the length of the main stream inclusive of the length of the header.
* * A u32 for padding.
* - The main stream data.
* - The extension stream (optional), which is composed of:
* * One or more headers.
* * The extension stream data, corresponding to the extension headers.
*
* The main stream provides the base command data. This has a fixed layout based on the features
* supported by a given GPU.
*
* The extension stream provides the command parameters that are required for BRNs & ERNs for the
* current GPU. This stream is comprised of one or more headers, followed by data for each given
* BRN/ERN.
*
* Each header is a u32 containing a bitmask of quirks & enhancements in the extension stream, a
* "type" field determining the set of quirks & enhancements the bitmask represents, and a
* continuation bit determining whether any more headers are present. The headers are then followed
* by command data; this is specific to each quirk/enhancement. All unused / reserved bits in the
* header must be set to 0.
*
* All parameters and headers in the main and extension streams must be naturally aligned.
*
* If a parameter appears in both the main and extension streams, then the extension parameter is
* used.
*/
/*
* Stream extension header definition
*/
#define PVR_STREAM_EXTHDR_TYPE_SHIFT 29U
#define PVR_STREAM_EXTHDR_TYPE_MASK (7U << PVR_STREAM_EXTHDR_TYPE_SHIFT)
#define PVR_STREAM_EXTHDR_TYPE_MAX 8U
#define PVR_STREAM_EXTHDR_CONTINUATION BIT(28U)
#define PVR_STREAM_EXTHDR_DATA_MASK ~(PVR_STREAM_EXTHDR_TYPE_MASK | PVR_STREAM_EXTHDR_CONTINUATION)
/*
* Stream extension header - Geometry 0
*/
#define PVR_STREAM_EXTHDR_TYPE_GEOM0 0U
#define PVR_STREAM_EXTHDR_GEOM0_BRN49927 BIT(0U)
#define PVR_STREAM_EXTHDR_GEOM0_VALID PVR_STREAM_EXTHDR_GEOM0_BRN49927
/*
* Stream extension header - Fragment 0
*/
#define PVR_STREAM_EXTHDR_TYPE_FRAG0 0U
#define PVR_STREAM_EXTHDR_FRAG0_BRN47217 BIT(0U)
#define PVR_STREAM_EXTHDR_FRAG0_BRN49927 BIT(1U)
#define PVR_STREAM_EXTHDR_FRAG0_VALID PVR_STREAM_EXTHDR_FRAG0_BRN49927
/*
* Stream extension header - Compute 0
*/
#define PVR_STREAM_EXTHDR_TYPE_COMPUTE0 0U
#define PVR_STREAM_EXTHDR_COMPUTE0_BRN49927 BIT(0U)
#define PVR_STREAM_EXTHDR_COMPUTE0_VALID PVR_STREAM_EXTHDR_COMPUTE0_BRN49927
#endif /* PVR_ROGUE_FWIF_STREAM_H */
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