| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| /* |
| * sdram_mode.h: Definitions for SDRAM Mode Register and Extended Mode Register |
| */ |
| |
| #ifndef __SDRAMMODE_H_DEFINED |
| #define __SDRAMMODE_H_DEFINED |
| |
| // SDRAM Mode Register definitions, per JESD79D |
| // These are transmitted via A0-A13 |
| |
| // Burst length |
| #define SDRAM_BURST_2 (1<<0) |
| #define SDRAM_BURST_4 (2<<0) |
| #define SDRAM_BURST_8 (3<<0) |
| |
| #define SDRAM_BURST_SEQUENTIAL (0<<3) |
| #define SDRAM_BURST_INTERLEAVED (1<<3) |
| |
| #define SDRAM_CAS_2_0 (2<<4) |
| #define SDRAM_CAS_3_0 (3<<4) /* Optional for DDR 200-333 */ |
| #define SDRAM_CAS_1_5 (5<<4) /* Optional */ |
| #define SDRAM_CAS_2_5 (6<<4) |
| #define SDRAM_CAS_MASK (7<<4) |
| |
| #define SDRAM_MODE_NORMAL (0 << 7) |
| #define SDRAM_MODE_TEST (1 << 7) |
| #define SDRAM_MODE_DLL_RESET (2 << 7) |
| |
| // Extended Mode Register |
| |
| #define SDRAM_EXTMODE_DLL_ENABLE (0 << 0) |
| #define SDRAM_EXTMODE_DLL_DISABLE (1 << 0) |
| |
| #define SDRAM_EXTMODE_DRIVE_NORMAL (0 << 1) |
| #define SDRAM_EXTMODE_DRIVE_WEAK (1 << 1) /* Optional */ |
| |
| #endif // __SDRAMMODE_H_DEFINED |
