path: root/arch/arm/cpu/armv7/omap5/sdram.c

/*
 * Timing and Organization details of the ddr device parts used in OMAP5
 * EVM
 *
 * (C) Copyright 2010
 * Texas Instruments, <www.ti.com>
 *
 * Aneesh V <aneesh@ti.com>
 * Sricharan R <r.sricharan@ti.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <asm/emif.h>
#include <asm/arch/sys_proto.h>

/*
 * This file provides details of the LPDDR2 SDRAM parts used on OMAP5
 * EVM. Since the parts used and geometry are identical for
 * evm for a given OMAP5 revision, this information is kept
 * here instead of being in board directory. However the key functions
 * exported are weakly linked so that they can be over-ridden in the board
 * directory if there is a OMAP5 board in the future that uses a different
 * memory device or geometry.
 *
 * For any new board with different memory devices over-ride one or more
 * of the following functions as per the CONFIG flags you intend to enable:
 * - emif_get_reg_dump()
 * - emif_get_dmm_regs()
 * - emif_get_device_details()
 * - emif_get_device_timings()
 */

#ifdef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
const struct emif_regs emif_regs_532_mhz_2cs = {
	.sdram_config_init		= 0x80800EBA,
	.sdram_config			= 0x808022BA,
	.ref_ctrl			= 0x0000081A,
	.sdram_tim1			= 0x772F6873,
	.sdram_tim2			= 0x304a129a,
	.sdram_tim3			= 0x02f7e45f,
	.read_idle_ctrl			= 0x00050000,
	.zq_config			= 0x000b3215,
	.temp_alert_config		= 0x08000a05,
	.emif_ddr_phy_ctlr_1_init	= 0x0E28420d,
	.emif_ddr_phy_ctlr_1		= 0x0E28420d,
	.emif_ddr_ext_phy_ctrl_1	= 0x04020080,
	.emif_ddr_ext_phy_ctrl_2	= 0x28C518A3,
	.emif_ddr_ext_phy_ctrl_3	= 0x518A3146,
	.emif_ddr_ext_phy_ctrl_4	= 0x0014628C,
	.emif_ddr_ext_phy_ctrl_5	= 0x04010040
};

const struct emif_regs emif_regs_532_mhz_2cs_es2 = {
	.sdram_config_init		= 0x80800EBA,
	.sdram_config			= 0x808022BA,
	.ref_ctrl			= 0x0000081A,
	.sdram_tim1			= 0x772F6873,
	.sdram_tim2			= 0x304a129a,
	.sdram_tim3			= 0x02f7e45f,
	.read_idle_ctrl			= 0x00050000,
	.zq_config			= 0x100b3215,
	.temp_alert_config		= 0x08000a05,
	.emif_ddr_phy_ctlr_1_init	= 0x0E30400d,
	.emif_ddr_phy_ctlr_1		= 0x0E30400d,
	.emif_ddr_ext_phy_ctrl_1	= 0x04020080,
	.emif_ddr_ext_phy_ctrl_2	= 0x28C518A3,
	.emif_ddr_ext_phy_ctrl_3	= 0x518A3146,
	.emif_ddr_ext_phy_ctrl_4	= 0x0014628C,
	.emif_ddr_ext_phy_ctrl_5	= 0xC330CC33,
};

const struct emif_regs emif_regs_266_mhz_2cs = {
	.sdram_config_init		= 0x80800EBA,
	.sdram_config			= 0x808022BA,
	.ref_ctrl			= 0x0000040D,
	.sdram_tim1			= 0x2A86B419,
	.sdram_tim2			= 0x1025094A,
	.sdram_tim3			= 0x026BA22F,
	.read_idle_ctrl			= 0x00050000,
	.zq_config			= 0x000b3215,
	.temp_alert_config		= 0x08000a05,
	.emif_ddr_phy_ctlr_1_init	= 0x0E28420d,
	.emif_ddr_phy_ctlr_1		= 0x0E28420d,
	.emif_ddr_ext_phy_ctrl_1	= 0x04020080,
	.emif_ddr_ext_phy_ctrl_2	= 0x0A414829,
	.emif_ddr_ext_phy_ctrl_3	= 0x14829052,
	.emif_ddr_ext_phy_ctrl_4	= 0x000520A4,
	.emif_ddr_ext_phy_ctrl_5	= 0x04010040
};

const struct emif_regs emif_regs_ddr3_532_mhz_1cs = {
	.sdram_config_init		= 0x61851B32,
	.sdram_config			= 0x61851B32,
	.sdram_config2			= 0x0,
	.ref_ctrl			= 0x00001035,
	.sdram_tim1			= 0xCCCF36B3,
	.sdram_tim2			= 0x308F7FDA,
	.sdram_tim3			= 0x027F88A8,
	.read_idle_ctrl			= 0x00050000,
	.zq_config			= 0x0007190B,
	.temp_alert_config		= 0x00000000,
	.emif_ddr_phy_ctlr_1_init	= 0x0020420A,
	.emif_ddr_phy_ctlr_1		= 0x0024420A,
	.emif_ddr_ext_phy_ctrl_1	= 0x04040100,
	.emif_ddr_ext_phy_ctrl_2	= 0x00000000,
	.emif_ddr_ext_phy_ctrl_3	= 0x00000000,
	.emif_ddr_ext_phy_ctrl_4	= 0x00000000,
	.emif_ddr_ext_phy_ctrl_5	= 0x04010040,
	.emif_rd_wr_lvl_rmp_win		= 0x00000000,
	.emif_rd_wr_lvl_rmp_ctl		= 0x80000000,
	.emif_rd_wr_lvl_ctl		= 0x00000000,
	.emif_rd_wr_exec_thresh		= 0x00000305
};

const struct emif_regs emif_regs_ddr3_532_mhz_1cs_es2 = {
	.sdram_config_init              = 0x61851B32,
	.sdram_config                   = 0x61851B32,
	.sdram_config2			= 0x0,
	.ref_ctrl                       = 0x00001035,
	.sdram_tim1                     = 0xCCCF36B3,
	.sdram_tim2                     = 0x308F7FDA,
	.sdram_tim3                     = 0x027F88A8,
	.read_idle_ctrl                 = 0x00050000,
	.zq_config                      = 0x1007190B,
	.temp_alert_config              = 0x00000000,
	.emif_ddr_phy_ctlr_1_init       = 0x0030400A,
	.emif_ddr_phy_ctlr_1            = 0x0034400A,
	.emif_ddr_ext_phy_ctrl_1        = 0x04040100,
	.emif_ddr_ext_phy_ctrl_2        = 0x00000000,
	.emif_ddr_ext_phy_ctrl_3        = 0x00000000,
	.emif_ddr_ext_phy_ctrl_4        = 0x00000000,
	.emif_ddr_ext_phy_ctrl_5        = 0x4350D435,
	.emif_rd_wr_lvl_rmp_win         = 0x00000000,
	.emif_rd_wr_lvl_rmp_ctl         = 0x80000000,
	.emif_rd_wr_lvl_ctl             = 0x00000000,
	.emif_rd_wr_exec_thresh         = 0x40000305
};

const struct emif_regs emif_1_regs_ddr3_532_mhz_1cs_dra_es1 = {
	.sdram_config_init              = 0x61851ab2,
	.sdram_config                   = 0x61851ab2,
	.sdram_config2			= 0x08000000,
	.ref_ctrl                       = 0x00001035,
	.sdram_tim1                     = 0xCCCF36B3,
	.sdram_tim2                     = 0x308F7FDA,
	.sdram_tim3                     = 0x027F88A8,
	.read_idle_ctrl                 = 0x00050000,
	.zq_config                      = 0x0007190B,
	.temp_alert_config              = 0x00000000,
	.emif_ddr_phy_ctlr_1_init       = 0x0024400A,
	.emif_ddr_phy_ctlr_1            = 0x0024400A,
	.emif_ddr_ext_phy_ctrl_1        = 0x10040100,
	.emif_ddr_ext_phy_ctrl_2        = 0x00B000B0,
	.emif_ddr_ext_phy_ctrl_3        = 0x00B000B0,
	.emif_ddr_ext_phy_ctrl_4        = 0x00B000B0,
	.emif_ddr_ext_phy_ctrl_5        = 0x00B000B0,
	.emif_rd_wr_lvl_rmp_win         = 0x00000000,
	.emif_rd_wr_lvl_rmp_ctl         = 0x80000000,
	.emif_rd_wr_lvl_ctl             = 0x00000000,
	.emif_rd_wr_exec_thresh         = 0x00000305
};

const struct emif_regs emif_2_regs_ddr3_532_mhz_1cs_dra_es1 = {
	.sdram_config_init              = 0x61851B32,
	.sdram_config                   = 0x61851B32,
	.sdram_config2			= 0x08000000,
	.ref_ctrl                       = 0x00001035,
	.sdram_tim1                     = 0xCCCF36B3,
	.sdram_tim2                     = 0x308F7FDA,
	.sdram_tim3                     = 0x027F88A8,
	.read_idle_ctrl                 = 0x00050000,
	.zq_config                      = 0x0007190B,
	.temp_alert_config              = 0x00000000,
	.emif_ddr_phy_ctlr_1_init       = 0x0024400A,
	.emif_ddr_phy_ctlr_1            = 0x0024400A,
	.emif_ddr_ext_phy_ctrl_1        = 0x10040100,
	.emif_ddr_ext_phy_ctrl_2        = 0x00B000B0,
	.emif_ddr_ext_phy_ctrl_3        = 0x00B000B0,
	.emif_ddr_ext_phy_ctrl_4        = 0x00B000B0,
	.emif_ddr_ext_phy_ctrl_5        = 0x00B000B0,
	.emif_rd_wr_lvl_rmp_win         = 0x00000000,
	.emif_rd_wr_lvl_rmp_ctl         = 0x80000000,
	.emif_rd_wr_lvl_ctl             = 0x00000000,
	.emif_rd_wr_exec_thresh         = 0x00000305
};

const struct dmm_lisa_map_regs lisa_map_4G_x_2_x_2 = {
	.dmm_lisa_map_0 = 0x0,
	.dmm_lisa_map_1 = 0x0,
	.dmm_lisa_map_2 = 0x80740300,
	.dmm_lisa_map_3 = 0xFF020100,
	.is_ma_present	= 0x1
};

/*
 * DRA752 EVM board has 1.5 GB of memory
 * EMIF1 --> 2Gb * 2 =  512MB
 * EMIF2 --> 2Gb * 4 =  1GB
 * so mapping 1GB interleaved and 512MB non-interleaved
 */
const struct dmm_lisa_map_regs lisa_map_2G_x_2_x_2_2G_x_1_x_2 = {
	.dmm_lisa_map_0 = 0x0,
	.dmm_lisa_map_1 = 0x80640300,
	.dmm_lisa_map_2 = 0xC0500220,
	.dmm_lisa_map_3 = 0xFF020100,
	.is_ma_present	= 0x1
};

/*
 * DRA752 EVM EMIF1 ONLY CONFIGURATION
 */
const struct dmm_lisa_map_regs lisa_map_2G_x_1_x_2 = {
	.dmm_lisa_map_0 = 0x0,
	.dmm_lisa_map_1 = 0x0,
	.dmm_lisa_map_2 = 0x80500100,
	.dmm_lisa_map_3 = 0xFF020100,
	.is_ma_present	= 0x1
};

/*
 * DRA752 EVM EMIF2 ONLY CONFIGURATION
 */
const struct dmm_lisa_map_regs lisa_map_2G_x_2_x_2 = {
	.dmm_lisa_map_0 = 0x0,
	.dmm_lisa_map_1 = 0x0,
	.dmm_lisa_map_2 = 0x80600200,
	.dmm_lisa_map_3 = 0xFF020100,
	.is_ma_present	= 0x1
};

static void emif_get_reg_dump_sdp(u32 emif_nr, const struct emif_regs **regs)
{
	switch (omap_revision()) {
	case OMAP5430_ES1_0:
		*regs = &emif_regs_532_mhz_2cs;
		break;
	case OMAP5432_ES1_0:
		*regs = &emif_regs_ddr3_532_mhz_1cs;
		break;
	case OMAP5430_ES2_0:
		*regs = &emif_regs_532_mhz_2cs_es2;
		break;
	case OMAP5432_ES2_0:
		*regs = &emif_regs_ddr3_532_mhz_1cs_es2;
		break;
	case DRA752_ES1_0:
	case DRA752_ES1_1:
		switch (emif_nr) {
		case 1:
			*regs = &emif_1_regs_ddr3_532_mhz_1cs_dra_es1;
			break;
		case 2:
			*regs = &emif_2_regs_ddr3_532_mhz_1cs_dra_es1;
			break;
		}
		break;
	default:
		*regs = &emif_1_regs_ddr3_532_mhz_1cs_dra_es1;
	}
}

void emif_get_reg_dump(u32 emif_nr, const struct emif_regs **regs)
	__attribute__((weak, alias("emif_get_reg_dump_sdp")));

static void emif_get_dmm_regs_sdp(const struct dmm_lisa_map_regs
						**dmm_lisa_regs)
{
	switch (omap_revision()) {
	case OMAP5430_ES1_0:
	case OMAP5430_ES2_0:
	case OMAP5432_ES1_0:
	case OMAP5432_ES2_0:
		*dmm_lisa_regs = &lisa_map_4G_x_2_x_2;
		break;
	case DRA752_ES1_0:
	case DRA752_ES1_1:
	default:
		*dmm_lisa_regs = &lisa_map_2G_x_2_x_2_2G_x_1_x_2;
	}

}

void emif_get_dmm_regs(const struct dmm_lisa_map_regs **dmm_lisa_regs)
	__attribute__((weak, alias("emif_get_dmm_regs_sdp")));
#else

static const struct lpddr2_device_details dev_4G_S4_details = {
	.type		= LPDDR2_TYPE_S4,
	.density	= LPDDR2_DENSITY_4Gb,
	.io_width	= LPDDR2_IO_WIDTH_32,
	.manufacturer	= LPDDR2_MANUFACTURER_SAMSUNG
};

static void emif_get_device_details_sdp(u32 emif_nr,
		struct lpddr2_device_details *cs0_device_details,
		struct lpddr2_device_details *cs1_device_details)
{
	/* EMIF1 & EMIF2 have identical configuration */
	*cs0_device_details = dev_4G_S4_details;
	*cs1_device_details = dev_4G_S4_details;
}

void emif_get_device_details(u32 emif_nr,
		struct lpddr2_device_details *cs0_device_details,
		struct lpddr2_device_details *cs1_device_details)
	__attribute__((weak, alias("emif_get_device_details_sdp")));

#endif /* CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS */

const u32 ext_phy_ctrl_const_base[] = {
	0x01004010,
	0x00001004,
	0x04010040,
	0x01004010,
	0x00001004,
	0x00000000,
	0x00000000,
	0x00000000,
	0x80080080,
	0x00800800,
	0x08102040,
	0x00000001,
	0x540A8150,
	0xA81502a0,
	0x002A0540,
	0x00000000,
	0x00000000,
	0x00000000,
	0x00000077,
	0x0
};

const u32 ddr3_ext_phy_ctrl_const_base_es1[] = {
	0x01004010,
	0x00001004,
	0x04010040,
	0x01004010,
	0x00001004,
	0x00000000,
	0x00000000,
	0x00000000,
	0x80080080,
	0x00800800,
	0x08102040,
	0x00000002,
	0x0,
	0x0,
	0x0,
	0x00000000,
	0x00000000,
	0x00000000,
	0x00000057,
	0x0
};

const u32 ddr3_ext_phy_ctrl_const_base_es2[] = {
	0x50D4350D,
	0x00000D43,
	0x04010040,
	0x01004010,
	0x00001004,
	0x00000000,
	0x00000000,
	0x00000000,
	0x80080080,
	0x00800800,
	0x08102040,
	0x00000002,
	0x00000000,
	0x00000000,
	0x00000000,
	0x00000000,
	0x00000000,
	0x00000000,
	0x00000057,
	0x0
};

const u32
dra_ddr3_ext_phy_ctrl_const_base_es1_emif1[] = {
	0x00B000B0,
	0x00400040,
	0x00400040,
	0x00400040,
	0x00400040,
	0x00400040,
	0x00800080,
	0x00800080,
	0x00800080,
	0x00800080,
	0x00800080,
	0x00600060,
	0x00600060,
	0x00600060,
	0x00600060,
	0x00600060,
	0x00800080,
	0x00800080,
	0x40010080,
	0x08102040,
	0x0,
	0x0,
	0x0,
	0x0,
	0x0
};

const u32
dra_ddr3_ext_phy_ctrl_const_base_es1_emif2[] = {
	0x00BB00BB,
	0x00440044,
	0x00440044,
	0x00440044,
	0x00440044,
	0x00440044,
	0x007F007F,
	0x007F007F,
	0x007F007F,
	0x007F007F,
	0x007F007F,
	0x00600060,
	0x00600060,
	0x00600060,
	0x00600060,
	0x00600060,
	0x0,
	0x00600020,
	0x40010080,
	0x08102040,
	0x0,
	0x0,
	0x0,
	0x0,
	0x0
};

const struct lpddr2_mr_regs mr_regs = {
	.mr1	= MR1_BL_8_BT_SEQ_WRAP_EN_NWR_8,
	.mr2	= 0x6,
	.mr3	= 0x1,
	.mr10	= MR10_ZQ_ZQINIT,
	.mr16	= MR16_REF_FULL_ARRAY
};

static void emif_get_ext_phy_ctrl_const_regs(u32 emif_nr,
					     const u32 **regs,
					     u32 *size)
{
	switch (omap_revision()) {
	case OMAP5430_ES1_0:
	case OMAP5430_ES2_0:
		*regs = ext_phy_ctrl_const_base;
		*size = ARRAY_SIZE(ext_phy_ctrl_const_base);
		break;
	case OMAP5432_ES1_0:
		*regs = ddr3_ext_phy_ctrl_const_base_es1;
		*size = ARRAY_SIZE(ddr3_ext_phy_ctrl_const_base_es1);
		break;
	case OMAP5432_ES2_0:
		*regs = ddr3_ext_phy_ctrl_const_base_es2;
		*size = ARRAY_SIZE(ddr3_ext_phy_ctrl_const_base_es2);
		break;
	case DRA752_ES1_0:
	case DRA752_ES1_1:
		if (emif_nr == 1) {
			*regs = dra_ddr3_ext_phy_ctrl_const_base_es1_emif1;
			*size =
			ARRAY_SIZE(dra_ddr3_ext_phy_ctrl_const_base_es1_emif1);
		} else {
			*regs = dra_ddr3_ext_phy_ctrl_const_base_es1_emif2;
			*size =
			ARRAY_SIZE(dra_ddr3_ext_phy_ctrl_const_base_es1_emif2);
		}
		break;
	default:
		*regs = ddr3_ext_phy_ctrl_const_base_es2;
		*size = ARRAY_SIZE(ddr3_ext_phy_ctrl_const_base_es2);

	}
}

void get_lpddr2_mr_regs(const struct lpddr2_mr_regs **regs)
{
	*regs = &mr_regs;
}

void do_ext_phy_settings(u32 base, const struct emif_regs *regs)
{
	u32 *ext_phy_ctrl_base = 0;
	u32 *emif_ext_phy_ctrl_base = 0;
	u32 emif_nr;
	const u32 *ext_phy_ctrl_const_regs;
	u32 i = 0;
	u32 size;

	emif_nr = (base == EMIF1_BASE) ? 1 : 2;

	struct emif_reg_struct *emif = (struct emif_reg_struct *)base;

	ext_phy_ctrl_base = (u32 *) &(regs->emif_ddr_ext_phy_ctrl_1);
	emif_ext_phy_ctrl_base = (u32 *) &(emif->emif_ddr_ext_phy_ctrl_1);

	/* Configure external phy control timing registers */
	for (i = 0; i < EMIF_EXT_PHY_CTRL_TIMING_REG; i++) {
		writel(*ext_phy_ctrl_base, emif_ext_phy_ctrl_base++);
		/* Update shadow registers */
		writel(*ext_phy_ctrl_base++, emif_ext_phy_ctrl_base++);
	}

	/*
	 * external phy 6-24 registers do not change with
	 * ddr frequency
	 */
	emif_get_ext_phy_ctrl_const_regs(emif_nr,
					 &ext_phy_ctrl_const_regs, &size);

	for (i = 0; i < size; i++) {
		writel(ext_phy_ctrl_const_regs[i],
		       emif_ext_phy_ctrl_base++);
		/* Update shadow registers */
		writel(ext_phy_ctrl_const_regs[i],
		       emif_ext_phy_ctrl_base++);
	}
}

#ifndef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
static const struct lpddr2_ac_timings timings_jedec_532_mhz = {
	.max_freq	= 532000000,
	.RL		= 8,
	.tRPab		= 21,
	.tRCD		= 18,
	.tWR		= 15,
	.tRASmin	= 42,
	.tRRD		= 10,
	.tWTRx2		= 15,
	.tXSR		= 140,
	.tXPx2		= 15,
	.tRFCab		= 130,
	.tRTPx2		= 15,
	.tCKE		= 3,
	.tCKESR		= 15,
	.tZQCS		= 90,
	.tZQCL		= 360,
	.tZQINIT	= 1000,
	.tDQSCKMAXx2	= 11,
	.tRASmax	= 70,
	.tFAW		= 50
};

static const struct lpddr2_min_tck min_tck = {
	.tRL		= 3,
	.tRP_AB		= 3,
	.tRCD		= 3,
	.tWR		= 3,
	.tRAS_MIN	= 3,
	.tRRD		= 2,
	.tWTR		= 2,
	.tXP		= 2,
	.tRTP		= 2,
	.tCKE		= 3,
	.tCKESR		= 3,
	.tFAW		= 8
};

static const struct lpddr2_ac_timings *ac_timings[MAX_NUM_SPEEDBINS] = {
	&timings_jedec_532_mhz
};

static const struct lpddr2_device_timings dev_4G_S4_timings = {
	.ac_timings	= ac_timings,
	.min_tck	= &min_tck,
};

/*
 * List of status registers to be controlled back to control registers
 * after initial leveling
 * readreg, writereg
 */
const struct read_write_regs omap5_bug_00339_regs[] = {
	{ 8,  5 },
	{ 9,  6 },
	{ 10, 7 },
	{ 14, 8 },
	{ 15, 9 },
	{ 16, 10 },
	{ 11, 2 },
	{ 12, 3 },
	{ 13, 4 },
	{ 17, 11 },
	{ 18, 12 },
	{ 19, 13 },
};

const struct read_write_regs dra_bug_00339_regs[] = {
	{ 7,  7 },
	{ 8,  8 },
	{ 9,  9 },
	{ 10, 10 },
	{ 11, 11 },
	{ 12, 2 },
	{ 13, 3 },
	{ 14, 4 },
	{ 15, 5 },
	{ 16, 6 },
	{ 17, 12 },
	{ 18, 13 },
	{ 19, 14 },
	{ 20, 15 },
	{ 21, 16 },
	{ 22, 17 },
	{ 23, 18 },
	{ 24, 19 },
	{ 25, 20 },
	{ 26, 21}
};

const struct read_write_regs *get_bug_regs(u32 *iterations)
{
	const struct read_write_regs *bug_00339_regs_ptr = NULL;

	switch (omap_revision()) {
	case OMAP5430_ES1_0:
	case OMAP5430_ES2_0:
	case OMAP5432_ES1_0:
	case OMAP5432_ES2_0:
		bug_00339_regs_ptr = omap5_bug_00339_regs;
		*iterations = sizeof(omap5_bug_00339_regs)/
			     sizeof(omap5_bug_00339_regs[0]);
		break;
	case DRA752_ES1_0:
	case DRA752_ES1_1:
		bug_00339_regs_ptr = dra_bug_00339_regs;
		*iterations = sizeof(dra_bug_00339_regs)/
			     sizeof(dra_bug_00339_regs[0]);
		break;
	default:
		printf("\n Error: UnKnown SOC");
	}

	return bug_00339_regs_ptr;
}

void emif_get_device_timings_sdp(u32 emif_nr,
		const struct lpddr2_device_timings **cs0_device_timings,
		const struct lpddr2_device_timings **cs1_device_timings)
{
	/* Identical devices on EMIF1 & EMIF2 */
	*cs0_device_timings = &dev_4G_S4_timings;
	*cs1_device_timings = &dev_4G_S4_timings;
}

void emif_get_device_timings(u32 emif_nr,
		const struct lpddr2_device_timings **cs0_device_timings,
		const struct lpddr2_device_timings **cs1_device_timings)
	__attribute__((weak, alias("emif_get_device_timings_sdp")));

#endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */