Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (c) 2018, The Linux Foundation
4 * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
5 */
6
7#ifndef __QCOM_UBWC_H__
8#define __QCOM_UBWC_H__
9
10#include <linux/bits.h>
11#include <linux/types.h>
12
13struct qcom_ubwc_cfg_data {
14 u32 ubwc_enc_version;
15 /* Can be read from MDSS_BASE + 0x58 */
16 u32 ubwc_dec_version;
17
18 /**
19 * @ubwc_swizzle: Whether to enable level 1, 2 & 3 bank swizzling.
20 *
21 * UBWC 1.0 always enables all three levels.
22 * UBWC 2.0 removes level 1 bank swizzling, leaving levels 2 & 3.
23 * UBWC 4.0 adds the optional ability to disable levels 2 & 3.
24 */
25 u32 ubwc_swizzle;
26#define UBWC_SWIZZLE_ENABLE_LVL1 BIT(0)
27#define UBWC_SWIZZLE_ENABLE_LVL2 BIT(1)
28#define UBWC_SWIZZLE_ENABLE_LVL3 BIT(2)
29
30 /**
31 * @highest_bank_bit: Highest Bank Bit
32 *
33 * The Highest Bank Bit value represents the bit of the highest
34 * DDR bank. This should ideally use DRAM type detection.
35 */
36 int highest_bank_bit;
37 bool ubwc_bank_spread;
38
39 /**
40 * @macrotile_mode: Macrotile Mode
41 *
42 * Whether to use 4-channel macrotiling mode or the newer
43 * 8-channel macrotiling mode introduced in UBWC 3.1. 0 is
44 * 4-channel and 1 is 8-channel.
45 */
46 bool macrotile_mode;
47};
48
49#define UBWC_1_0 0x10000000
50#define UBWC_2_0 0x20000000
51#define UBWC_3_0 0x30000000
52#define UBWC_4_0 0x40000000
53#define UBWC_4_3 0x40030000
54#define UBWC_5_0 0x50000000
55#define UBWC_6_0 0x60000000
56
57#if IS_ENABLED(CONFIG_QCOM_UBWC_CONFIG)
58const struct qcom_ubwc_cfg_data *qcom_ubwc_config_get_data(void);
59#else
60static inline const struct qcom_ubwc_cfg_data *qcom_ubwc_config_get_data(void)
61{
62 return ERR_PTR(-EOPNOTSUPP);
63}
64#endif
65
66static inline bool qcom_ubwc_get_ubwc_mode(const struct qcom_ubwc_cfg_data *cfg)
67{
68 bool ret = cfg->ubwc_enc_version == UBWC_1_0;
69
70 if (ret && !(cfg->ubwc_swizzle & UBWC_SWIZZLE_ENABLE_LVL1))
71 pr_err("UBWC config discrepancy - level 1 swizzling disabled on UBWC 1.0\n");
72
73 return ret;
74}
75
76#endif /* __QCOM_UBWC_H__ */