1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 3 /* 4 * sdram_mode.h: Definitions for SDRAM Mode Register and Extended Mode Register 5 */ 6 7 #ifndef __SDRAMMODE_H_DEFINED 8 #define __SDRAMMODE_H_DEFINED 9 10 // SDRAM Mode Register definitions, per JESD79D 11 // These are transmitted via A0-A13 12 13 // Burst length 14 #define SDRAM_BURST_2 (1<<0) 15 #define SDRAM_BURST_4 (2<<0) 16 #define SDRAM_BURST_8 (3<<0) 17 18 #define SDRAM_BURST_SEQUENTIAL (0<<3) 19 #define SDRAM_BURST_INTERLEAVED (1<<3) 20 21 #define SDRAM_CAS_2_0 (2<<4) 22 #define SDRAM_CAS_3_0 (3<<4) /* Optional for DDR 200-333 */ 23 #define SDRAM_CAS_1_5 (5<<4) /* Optional */ 24 #define SDRAM_CAS_2_5 (6<<4) 25 #define SDRAM_CAS_MASK (7<<4) 26 27 #define SDRAM_MODE_NORMAL (0 << 7) 28 #define SDRAM_MODE_TEST (1 << 7) 29 #define SDRAM_MODE_DLL_RESET (2 << 7) 30 31 // Extended Mode Register 32 33 #define SDRAM_EXTMODE_DLL_ENABLE (0 << 0) 34 #define SDRAM_EXTMODE_DLL_DISABLE (1 << 0) 35 36 #define SDRAM_EXTMODE_DRIVE_NORMAL (0 << 1) 37 #define SDRAM_EXTMODE_DRIVE_WEAK (1 << 1) /* Optional */ 38 39 #endif // __SDRAMMODE_H_DEFINED 40