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/printk.h> 12 #include <linux/types.h> 13 14 struct qcom_ubwc_cfg_data { 15 u32 ubwc_enc_version; 16 /* Can be read from MDSS_BASE + 0x58 */ 17 u32 ubwc_dec_version; 18 19 /** 20 * @ubwc_swizzle: Whether to enable level 1, 2 & 3 bank swizzling. 21 * 22 * UBWC 1.0 always enables all three levels. 23 * UBWC 2.0 removes level 1 bank swizzling, leaving levels 2 & 3. 24 * UBWC 4.0 adds the optional ability to disable levels 2 & 3. 25 */ 26 u32 ubwc_swizzle; 27 #define UBWC_SWIZZLE_ENABLE_LVL1 BIT(0) 28 #define UBWC_SWIZZLE_ENABLE_LVL2 BIT(1) 29 #define UBWC_SWIZZLE_ENABLE_LVL3 BIT(2) 30 31 /** 32 * @highest_bank_bit: Highest Bank Bit 33 * 34 * The Highest Bank Bit value represents the bit of the highest 35 * DDR bank. This should ideally use DRAM type detection. 36 */ 37 int highest_bank_bit; 38 bool ubwc_bank_spread; 39 40 /** 41 * @macrotile_mode: Macrotile Mode 42 * 43 * Whether to use 4-channel macrotiling mode or the newer 44 * 8-channel macrotiling mode introduced in UBWC 3.1. 0 is 45 * 4-channel and 1 is 8-channel. 46 */ 47 bool macrotile_mode; 48 }; 49 50 #define UBWC_1_0 0x10000000 51 #define UBWC_2_0 0x20000000 52 #define UBWC_3_0 0x30000000 53 #define UBWC_4_0 0x40000000 54 #define UBWC_4_3 0x40030000 55 #define UBWC_5_0 0x50000000 56 #define UBWC_6_0 0x60000000 57 58 #if IS_ENABLED(CONFIG_QCOM_UBWC_CONFIG) 59 const struct qcom_ubwc_cfg_data *qcom_ubwc_config_get_data(void); 60 #else 61 static inline const struct qcom_ubwc_cfg_data *qcom_ubwc_config_get_data(void) 62 { 63 return ERR_PTR(-EOPNOTSUPP); 64 } 65 #endif 66 67 static inline bool qcom_ubwc_get_ubwc_mode(const struct qcom_ubwc_cfg_data *cfg) 68 { 69 bool ret = cfg->ubwc_enc_version == UBWC_1_0; 70 71 if (ret && !(cfg->ubwc_swizzle & UBWC_SWIZZLE_ENABLE_LVL1)) 72 pr_err("UBWC config discrepancy - level 1 swizzling disabled on UBWC 1.0\n"); 73 74 return ret; 75 } 76 77 #endif /* __QCOM_UBWC_H__ */ 78