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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2018, The Linux Foundation
* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
*/
#ifndef __QCOM_UBWC_H__
#define __QCOM_UBWC_H__
#include <linux/bits.h>
#include <linux/types.h>
struct qcom_ubwc_cfg_data {
u32 ubwc_enc_version;
/* Can be read from MDSS_BASE + 0x58 */
u32 ubwc_dec_version;
/**
* @ubwc_swizzle: Whether to enable level 1, 2 & 3 bank swizzling.
*
* UBWC 1.0 always enables all three levels.
* UBWC 2.0 removes level 1 bank swizzling, leaving levels 2 & 3.
* UBWC 4.0 adds the optional ability to disable levels 2 & 3.
*/
u32 ubwc_swizzle;
#define UBWC_SWIZZLE_ENABLE_LVL1 BIT(0)
#define UBWC_SWIZZLE_ENABLE_LVL2 BIT(1)
#define UBWC_SWIZZLE_ENABLE_LVL3 BIT(2)
/**
* @highest_bank_bit: Highest Bank Bit
*
* The Highest Bank Bit value represents the bit of the highest
* DDR bank. This should ideally use DRAM type detection.
*/
int highest_bank_bit;
bool ubwc_bank_spread;
/**
* @macrotile_mode: Macrotile Mode
*
* Whether to use 4-channel macrotiling mode or the newer
* 8-channel macrotiling mode introduced in UBWC 3.1. 0 is
* 4-channel and 1 is 8-channel.
*/
bool macrotile_mode;
};
#define UBWC_1_0 0x10000000
#define UBWC_2_0 0x20000000
#define UBWC_3_0 0x30000000
#define UBWC_4_0 0x40000000
#define UBWC_4_3 0x40030000
#define UBWC_5_0 0x50000000
#if IS_ENABLED(CONFIG_QCOM_UBWC_CONFIG)
const struct qcom_ubwc_cfg_data *qcom_ubwc_config_get_data(void);
#else
static inline const struct qcom_ubwc_cfg_data *qcom_ubwc_config_get_data(void)
{
return ERR_PTR(-EOPNOTSUPP);
}
#endif
static inline bool qcom_ubwc_get_ubwc_mode(const struct qcom_ubwc_cfg_data *cfg)
{
bool ret = cfg->ubwc_enc_version == UBWC_1_0;
if (ret && !(cfg->ubwc_swizzle & UBWC_SWIZZLE_ENABLE_LVL1))
pr_err("UBWC config discrepancy - level 1 swizzling disabled on UBWC 1.0\n");
return ret;
}
#endif /* __QCOM_UBWC_H__ */
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