fmc.h

/*
 * (C) Copyright 2013
 * Pavel Boldin, Emcraft Systems, paboldin@emcraft.com
 *
 * (C) Copyright 2015
 * Kamil Lulko, <kamil.lulko@gmail.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef _MACH_FMC_H_
#define _MACH_FMC_H_

struct stm32_fmc_regs {
	u32 sdcr1;	/* Control register 1 */
	u32 sdcr2;	/* Control register 2 */
	u32 sdtr1;	/* Timing register 1 */
	u32 sdtr2;	/* Timing register 2 */
	u32 sdcmr;	/* Mode register */
	u32 sdrtr;	/* Refresh timing register */
	u32 sdsr;	/* Status register */
};

/*
 * FMC registers base
 */
#define STM32_SDRAM_FMC		((struct stm32_fmc_regs *)SDRAM_FMC_BASE)

/* Control register SDCR */
#define FMC_SDCR_RPIPE_SHIFT	13	/* RPIPE bit shift */
#define FMC_SDCR_RBURST_SHIFT	12	/* RBURST bit shift */
#define FMC_SDCR_SDCLK_SHIFT	10	/* SDRAM clock divisor shift */
#define FMC_SDCR_WP_SHIFT	9	/* Write protection shift */
#define FMC_SDCR_CAS_SHIFT	7	/* CAS latency shift */
#define FMC_SDCR_NB_SHIFT	6	/* Number of banks shift */
#define FMC_SDCR_MWID_SHIFT	4	/* Memory width shift */
#define FMC_SDCR_NR_SHIFT	2	/* Number of row address bits shift */
#define FMC_SDCR_NC_SHIFT	0	/* Number of col address bits shift */

/* Timings register SDTR */
#define FMC_SDTR_TMRD_SHIFT	0	/* Load mode register to active */
#define FMC_SDTR_TXSR_SHIFT	4	/* Exit self-refresh time */
#define FMC_SDTR_TRAS_SHIFT	8	/* Self-refresh time */
#define FMC_SDTR_TRC_SHIFT	12	/* Row cycle delay */
#define FMC_SDTR_TWR_SHIFT	16	/* Recovery delay */
#define FMC_SDTR_TRP_SHIFT	20	/* Row precharge delay */
#define FMC_SDTR_TRCD_SHIFT	24	/* Row-to-column delay */


#define FMC_SDCMR_NRFS_SHIFT	5

#define FMC_SDCMR_MODE_NORMAL		0
#define FMC_SDCMR_MODE_START_CLOCK	1
#define FMC_SDCMR_MODE_PRECHARGE	2
#define FMC_SDCMR_MODE_AUTOREFRESH	3
#define FMC_SDCMR_MODE_WRITE_MODE	4
#define FMC_SDCMR_MODE_SELFREFRESH	5
#define FMC_SDCMR_MODE_POWERDOWN	6

#define FMC_SDCMR_BANK_1		BIT(4)
#define FMC_SDCMR_BANK_2		BIT(3)

#define FMC_SDCMR_MODE_REGISTER_SHIFT	9

#define FMC_SDSR_BUSY			BIT(5)

#define FMC_BUSY_WAIT()		do { \
		__asm__ __volatile__ ("dsb" : : : "memory"); \
		while (STM32_SDRAM_FMC->sdsr & FMC_SDSR_BUSY) \
			; \
	} while (0)


#endif /* _MACH_FMC_H_ */