tile.h

 1/* SPDX-License-Identifier: MIT */
 2#ifndef __NV50_TILE_H__
 3#define __NV50_TILE_H__
 4
 5#include <linux/types.h>
 6#include <linux/math.h>
 7
 8/*
 9 * Tiling parameters for NV50+.
10 * GOB = Group of bytes, the main unit for tiling blocks.
11 * Tiling blocks are a power of 2 number of GOB.
12 * All GOBs and blocks have the same width: 64 bytes (so 16 pixels in 32bits).
13 * tile_mode is the log2 of the number of GOB per block.
14 */
15
16#define NV_TILE_GOB_HEIGHT_TESLA 4	/* 4 x 64 bytes = 256 bytes for a GOB on Tesla*/
17#define NV_TILE_GOB_HEIGHT 8		/* 8 x 64 bytes = 512 bytes for a GOB on Fermi and later */
18#define NV_TILE_GOB_WIDTH_BYTES 64
19
20/* Number of blocks to cover the width of the framebuffer */
21static inline u32 nouveau_get_width_in_blocks(u32 stride)
22{
23	return DIV_ROUND_UP(stride, NV_TILE_GOB_WIDTH_BYTES);
24}
25
26/* Return the height in pixel of one GOB */
27static inline u32 nouveau_get_gob_height(u16 family)
28{
29	if (family == NV_DEVICE_INFO_V0_TESLA)
30		return NV_TILE_GOB_HEIGHT_TESLA;
31	else
32		return NV_TILE_GOB_HEIGHT;
33}
34
35/* Number of blocks to cover the heigth of the framebuffer */
36static inline u32 nouveau_get_height_in_blocks(u32 height, u32 gobs_in_block, u16 family)
37{
38	return DIV_ROUND_UP(height, nouveau_get_gob_height(family) * gobs_in_block);
39}
40
41/* Return the GOB size in bytes */
42static inline u32 nouveau_get_gob_size(u16 family)
43{
44	return nouveau_get_gob_height(family) * NV_TILE_GOB_WIDTH_BYTES;
45}
46
47/* Return the number of GOB in a block */
48static inline int nouveau_get_gobs_in_block(u32 tile_mode, u16 chipset)
49{
50	if (chipset >= 0xc0)
51		return 1 << (tile_mode >> 4);
52	return 1 << tile_mode;
53}
54
55/* Return true if tile_mode is invalid */
56static inline bool nouveau_check_tile_mode(u32 tile_mode, u16 chipset)
57{
58	if (chipset >= 0xc0)
59		return (tile_mode & 0xfffff0f);
60	return (tile_mode & 0xfffffff0);
61}
62
63#endif