board/freescale/ls1043aqds/ddr.c

/*
 * Copyright 2015 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <fsl_ddr_sdram.h>
#include <fsl_ddr_dimm_params.h>
#ifdef CONFIG_FSL_DEEP_SLEEP
#include <fsl_sleep.h>
#endif
#include "ddr.h"

DECLARE_GLOBAL_DATA_PTR;

void fsl_ddr_board_options(memctl_options_t *popts,
			   dimm_params_t *pdimm,
			   unsigned int ctrl_num)
{
	const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
	ulong ddr_freq;

	if (ctrl_num > 3) {
		printf("Not supported controller number %d\n", ctrl_num);
		return;
	}
	if (!pdimm->n_ranks)
		return;

	pbsp = udimms[0];

	/* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr
	 * freqency and n_banks specified in board_specific_parameters table.
	 */
	ddr_freq = get_ddr_freq(0) / 1000000;
	while (pbsp->datarate_mhz_high) {
		if (pbsp->n_ranks == pdimm->n_ranks) {
			if (ddr_freq <= pbsp->datarate_mhz_high) {
				popts->clk_adjust = pbsp->clk_adjust;
				popts->wrlvl_start = pbsp->wrlvl_start;
				popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
				popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
				popts->cpo_override = pbsp->cpo_override;
				popts->write_data_delay =
					pbsp->write_data_delay;
				goto found;
			}
			pbsp_highest = pbsp;
		}
		pbsp++;
	}

	if (pbsp_highest) {
		printf("Error: board specific timing not found for %lu MT/s\n",
		       ddr_freq);
		printf("Trying to use the highest speed (%u) parameters\n",
		       pbsp_highest->datarate_mhz_high);
		popts->clk_adjust = pbsp_highest->clk_adjust;
		popts->wrlvl_start = pbsp_highest->wrlvl_start;
		popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
		popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
	} else {
		panic("DIMM is not supported by this board");
	}
found:
	debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n",
	      pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb);

	/* force DDR bus width to 32 bits */
	popts->data_bus_width = 1;
	popts->otf_burst_chop_en = 0;
	popts->burst_length = DDR_BL8;
	popts->bstopre = 0;		/* enable auto precharge */

	/*
	 * Factors to consider for half-strength driver enable:
	 *	- number of DIMMs installed
	 */
	popts->half_strength_driver_enable = 1;
	/*
	 * Write leveling override
	 */
	popts->wrlvl_override = 1;
	popts->wrlvl_sample = 0xf;

	/*
	 * Rtt and Rtt_WR override
	 */
	popts->rtt_override = 0;

	/* Enable ZQ calibration */
	popts->zq_en = 1;

#ifdef CONFIG_SYS_FSL_DDR4
	popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_80ohm);
	popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm) |
			  DDR_CDR2_VREF_OVRD(70);	/* Vref = 70% */

	/* optimize cpo for erratum A-009942 */
	popts->cpo_sample = 0x59;
#else
	popts->cswl_override = DDR_CSWL_CS0;

	/* DHC_EN =1, ODT = 75 Ohm */
	popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
	popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
#endif
}

int initdram(void)
{
	phys_size_t dram_size;

#if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
	return fsl_ddr_sdram_size();
#else
	puts("Initializing DDR....using SPD\n");

	dram_size = fsl_ddr_sdram();
#endif
	erratum_a008850_post();

#ifdef CONFIG_FSL_DEEP_SLEEP
	fsl_dp_ddr_restore();
#endif

	gd->ram_size = dram_size;

	return 0;
}