linux-arkmicro/u-boot/board/freescale/ls1088a/ddr.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2017 NXP
 */

#include <common.h>
#include <fsl_ddr_sdram.h>
#include <fsl_ddr_dimm_params.h>
#include <asm/arch/soc.h>
#include <asm/arch/clock.h>
#include "ddr.h"

DECLARE_GLOBAL_DATA_PTR;

#if defined(CONFIG_VID) && (!defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD))
static void fsl_ddr_setup_0v9_volt(memctl_options_t *popts)
{
	int vdd;

	vdd = get_core_volt_from_fuse();
	/* Nothing to do for silicons doesn't support VID */
	if (vdd < 0)
		return;

	if (vdd == 900) {
		popts->ddr_cdr1 |= DDR_CDR1_V0PT9_EN;
		debug("VID: configure DDR to support 900 mV\n");
	}
}
#endif

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 > 1) {
		printf("Not supported controller number %d\n", ctrl_num);
		return;
	}
	if (!pdimm->n_ranks)
		return;

	/*
	 * we use identical timing for all slots. If needed, change the code
	 * to  pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
	 */
	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;
				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"
		"\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, wrlvl_ctrl_3 0x%x\n",
		pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb,
		pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2,
		pbsp->wrlvl_ctl_3);



	popts->half_strength_driver_enable = 0;
	/*
	 * Write leveling override
	 */
	popts->wrlvl_override = 1;
	popts->wrlvl_sample = 0xf;


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

	/* Enable DDR hashing */
	popts->addr_hash = 1;

	popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_60ohm);
#if defined(CONFIG_VID) && (!defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD))
	fsl_ddr_setup_0v9_volt(popts);
#endif

	popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_60ohm) |
			  DDR_CDR2_VREF_TRAIN_EN | DDR_CDR2_VREF_RANGE_2;
}


int fsl_initdram(void)
{
	puts("Initializing DDR....using SPD\n");

#if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
	gd->ram_size = fsl_ddr_sdram_size();
#else
	gd->ram_size = fsl_ddr_sdram();
#endif
	return 0;
}