1 /* 2 * (C) Copyright 2013 3 * Pavel Boldin, Emcraft Systems, paboldin@emcraft.com 4 * 5 * (C) Copyright 2015 6 * Kamil Lulko, <kamil.lulko@gmail.com> 7 * 8 * SPDX-License-Identifier: GPL-2.0+ 9 */ 10 11 #ifndef _MACH_FMC_H_ 12 #define _MACH_FMC_H_ 13 14 struct stm32_fmc_regs { 15 u32 sdcr1; /* Control register 1 */ 16 u32 sdcr2; /* Control register 2 */ 17 u32 sdtr1; /* Timing register 1 */ 18 u32 sdtr2; /* Timing register 2 */ 19 u32 sdcmr; /* Mode register */ 20 u32 sdrtr; /* Refresh timing register */ 21 u32 sdsr; /* Status register */ 22 }; 23 24 /* 25 * FMC registers base 26 */ 27 #define STM32_SDRAM_FMC_BASE 0xA0000140 28 #define STM32_SDRAM_FMC ((struct stm32_fmc_regs *)STM32_SDRAM_FMC_BASE) 29 30 /* Control register SDCR */ 31 #define FMC_SDCR_RPIPE_SHIFT 13 /* RPIPE bit shift */ 32 #define FMC_SDCR_RBURST_SHIFT 12 /* RBURST bit shift */ 33 #define FMC_SDCR_SDCLK_SHIFT 10 /* SDRAM clock divisor shift */ 34 #define FMC_SDCR_WP_SHIFT 9 /* Write protection shift */ 35 #define FMC_SDCR_CAS_SHIFT 7 /* CAS latency shift */ 36 #define FMC_SDCR_NB_SHIFT 6 /* Number of banks shift */ 37 #define FMC_SDCR_MWID_SHIFT 4 /* Memory width shift */ 38 #define FMC_SDCR_NR_SHIFT 2 /* Number of row address bits shift */ 39 #define FMC_SDCR_NC_SHIFT 0 /* Number of col address bits shift */ 40 41 /* Timings register SDTR */ 42 #define FMC_SDTR_TMRD_SHIFT 0 /* Load mode register to active */ 43 #define FMC_SDTR_TXSR_SHIFT 4 /* Exit self-refresh time */ 44 #define FMC_SDTR_TRAS_SHIFT 8 /* Self-refresh time */ 45 #define FMC_SDTR_TRC_SHIFT 12 /* Row cycle delay */ 46 #define FMC_SDTR_TWR_SHIFT 16 /* Recovery delay */ 47 #define FMC_SDTR_TRP_SHIFT 20 /* Row precharge delay */ 48 #define FMC_SDTR_TRCD_SHIFT 24 /* Row-to-column delay */ 49 50 51 #define FMC_SDCMR_NRFS_SHIFT 5 52 53 #define FMC_SDCMR_MODE_NORMAL 0 54 #define FMC_SDCMR_MODE_START_CLOCK 1 55 #define FMC_SDCMR_MODE_PRECHARGE 2 56 #define FMC_SDCMR_MODE_AUTOREFRESH 3 57 #define FMC_SDCMR_MODE_WRITE_MODE 4 58 #define FMC_SDCMR_MODE_SELFREFRESH 5 59 #define FMC_SDCMR_MODE_POWERDOWN 6 60 61 #define FMC_SDCMR_BANK_1 (1 << 4) 62 #define FMC_SDCMR_BANK_2 (1 << 3) 63 64 #define FMC_SDCMR_MODE_REGISTER_SHIFT 9 65 66 #define FMC_SDSR_BUSY (1 << 5) 67 68 #define FMC_BUSY_WAIT() do { \ 69 __asm__ __volatile__ ("dsb" : : : "memory"); \ 70 while (STM32_SDRAM_FMC->sdsr & FMC_SDSR_BUSY) \ 71 ; \ 72 } while (0) 73 74 75 #endif /* _MACH_FMC_H_ */ 76