omap4: calculate EMIF register values

Calculate EMIF register values based on AC timing parameters
from the SDRAM datasheet and the DDR frequency rather than
using the hard-coded values.

For a new board the user doen't have to go through the tedious
process of calculating the register values. Instead, just
provide the AC timings from the device data sheet as input
and the driver will automatically calculate the register values.

Signed-off-by: Aneesh V <aneesh@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

5 files changed, 953 insertions, 4 deletions

diff --git a/arch/arm/cpu/armv7/omap-common/Makefile b/arch/arm/cpu/armv7/omap-common/Makefile
index dc01ee5d3c..8f698f841d 100644
--- a/arch/arm/cpu/armv7/omap-common/Makefile
+++ b/arch/arm/cpu/armv7/omap-common/Makefile
@@ -28,6 +28,7 @@ LIB	= $(obj)libomap-common.o
 SOBJS	:= reset.o
 
 COBJS	:= timer.o
+COBJS	+= utils.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/arch/arm/cpu/armv7/omap-common/utils.c b/arch/arm/cpu/armv7/omap-common/utils.c
new file mode 100644
index 0000000000..ea935da45b
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap-common/utils.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2011 Linaro Limited
+ * Aneesh V <aneesh@ti.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+static void do_cancel_out(u32 *num, u32 *den, u32 factor)
+{
+	while (1) {
+		if (((*num)/factor*factor == (*num)) &&
+		   ((*den)/factor*factor == (*den))) {
+			(*num) /= factor;
+			(*den) /= factor;
+		} else
+			break;
+	}
+}
+
+/*
+ * Cancel out the denominator and numerator of a fraction
+ * to get smaller numerator and denominator.
+ */
+void cancel_out(u32 *num, u32 *den, u32 den_limit)
+{
+	do_cancel_out(num, den, 2);
+	do_cancel_out(num, den, 3);
+	do_cancel_out(num, den, 5);
+	do_cancel_out(num, den, 7);
+	do_cancel_out(num, den, 11);
+	do_cancel_out(num, den, 13);
+	do_cancel_out(num, den, 17);
+	while ((*den) > den_limit) {
+		*num /= 2;
+		/*
+		 * Round up the denominator so that the final fraction
+		 * (num/den) is always <= the desired value
+		 */
+		*den = (*den + 1) / 2;
+	}
+}
diff --git a/arch/arm/cpu/armv7/omap4/board.c b/arch/arm/cpu/armv7/omap4/board.c
index ca107f790f..786c239794 100644
--- a/arch/arm/cpu/armv7/omap4/board.c
+++ b/arch/arm/cpu/armv7/omap4/board.c
@@ -32,6 +32,7 @@
 #include <asm/arch/cpu.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/sizes.h>
+#include <asm/arch/emif.h>
 #include "omap4_mux_data.h"
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -193,13 +194,13 @@ u32 omap4_sdram_size(void)
 {
 	u32 section, i, total_size = 0, size, addr;
 	for (i = 0; i < 4; i++) {
-		section	= __raw_readl(DMM_LISA_MAP_BASE + i*4);
-		addr = section & DMM_LISA_MAP_SYS_ADDR_MASK;
+		section	= __raw_readl(OMAP44XX_DMM_LISA_MAP_BASE + i*4);
+		addr = section & OMAP44XX_SYS_ADDR_MASK;
 		/* See if the address is valid */
 		if ((addr >= OMAP44XX_DRAM_ADDR_SPACE_START) &&
 		    (addr < OMAP44XX_DRAM_ADDR_SPACE_END)) {
-			size	= ((section & DMM_LISA_MAP_SYS_SIZE_MASK) >>
-				    DMM_LISA_MAP_SYS_SIZE_SHIFT);
+			size	= ((section & OMAP44XX_SYS_SIZE_MASK) >>
+				   OMAP44XX_SYS_SIZE_SHIFT);
 			size	= 1 << size;
 			size	*= SZ_16M;
 			total_size += size;
diff --git a/arch/arm/cpu/armv7/omap4/emif.c b/arch/arm/cpu/armv7/omap4/emif.c
index b25c1ee8cd..ceead9eb02 100644
--- a/arch/arm/cpu/armv7/omap4/emif.c
+++ b/arch/arm/cpu/armv7/omap4/emif.c
@@ -170,6 +170,628 @@ static void emif_update_timings(u32 base, const struct emif_regs *regs)
 	}
 }
 
+#ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
+#define print_timing_reg(reg) debug(#reg" - 0x%08x\n", (reg))
+
+static u32 *const T_num = (u32 *)OMAP4_SRAM_SCRATCH_EMIF_T_NUM;
+static u32 *const T_den = (u32 *)OMAP4_SRAM_SCRATCH_EMIF_T_DEN;
+static u32 *const emif_sizes = (u32 *)OMAP4_SRAM_SCRATCH_EMIF_SIZE;
+
+/*
+ * Organization and refresh requirements for LPDDR2 devices of different
+ * types and densities. Derived from JESD209-2 section 2.4
+ */
+const struct lpddr2_addressing addressing_table[] = {
+	/* Banks tREFIx10     rowx32,rowx16      colx32,colx16	density */
+	{BANKS4, T_REFI_15_6, {ROW_12, ROW_12}, {COL_7, COL_8} },/*64M */
+	{BANKS4, T_REFI_15_6, {ROW_12, ROW_12}, {COL_8, COL_9} },/*128M */
+	{BANKS4, T_REFI_7_8, {ROW_13, ROW_13}, {COL_8, COL_9} },/*256M */
+	{BANKS4, T_REFI_7_8, {ROW_13, ROW_13}, {COL_9, COL_10} },/*512M */
+	{BANKS8, T_REFI_7_8, {ROW_13, ROW_13}, {COL_9, COL_10} },/*1GS4 */
+	{BANKS8, T_REFI_3_9, {ROW_14, ROW_14}, {COL_9, COL_10} },/*2GS4 */
+	{BANKS8, T_REFI_3_9, {ROW_14, ROW_14}, {COL_10, COL_11} },/*4G */
+	{BANKS8, T_REFI_3_9, {ROW_15, ROW_15}, {COL_10, COL_11} },/*8G */
+	{BANKS4, T_REFI_7_8, {ROW_14, ROW_14}, {COL_9, COL_10} },/*1GS2 */
+	{BANKS4, T_REFI_3_9, {ROW_15, ROW_15}, {COL_9, COL_10} },/*2GS2 */
+};
+
+static const u32 lpddr2_density_2_size_in_mbytes[] = {
+	8,			/* 64Mb */
+	16,			/* 128Mb */
+	32,			/* 256Mb */
+	64,			/* 512Mb */
+	128,			/* 1Gb   */
+	256,			/* 2Gb   */
+	512,			/* 4Gb   */
+	1024,			/* 8Gb   */
+	2048,			/* 16Gb  */
+	4096			/* 32Gb  */
+};
+
+/*
+ * Calculate the period of DDR clock from frequency value and set the
+ * denominator and numerator in global variables for easy access later
+ */
+static void set_ddr_clk_period(u32 freq)
+{
+	/*
+	 * period = 1/freq
+	 * period_in_ns = 10^9/freq
+	 */
+	*T_num = 1000000000;
+	*T_den = freq;
+	cancel_out(T_num, T_den, 200);
+
+}
+
+/*
+ * Convert time in nano seconds to number of cycles of DDR clock
+ */
+static inline u32 ns_2_cycles(u32 ns)
+{
+	return ((ns * (*T_den)) + (*T_num) - 1) / (*T_num);
+}
+
+/*
+ * ns_2_cycles with the difference that the time passed is 2 times the actual
+ * value(to avoid fractions). The cycles returned is for the original value of
+ * the timing parameter
+ */
+static inline u32 ns_x2_2_cycles(u32 ns)
+{
+	return ((ns * (*T_den)) + (*T_num) * 2 - 1) / ((*T_num) * 2);
+}
+
+/*
+ * Find addressing table index based on the device's type(S2 or S4) and
+ * density
+ */
+s8 addressing_table_index(u8 type, u8 density, u8 width)
+{
+	u8 index;
+	if ((density > LPDDR2_DENSITY_8Gb) || (width == LPDDR2_IO_WIDTH_8))
+		return -1;
+
+	/*
+	 * Look at the way ADDR_TABLE_INDEX* values have been defined
+	 * in emif.h compared to LPDDR2_DENSITY_* values
+	 * The table is layed out in the increasing order of density
+	 * (ignoring type). The exceptions 1GS2 and 2GS2 have been placed
+	 * at the end
+	 */
+	if ((type == LPDDR2_TYPE_S2) && (density == LPDDR2_DENSITY_1Gb))
+		index = ADDR_TABLE_INDEX1GS2;
+	else if ((type == LPDDR2_TYPE_S2) && (density == LPDDR2_DENSITY_2Gb))
+		index = ADDR_TABLE_INDEX2GS2;
+	else
+		index = density;
+
+	debug("emif: addressing table index %d\n", index);
+
+	return index;
+}
+
+/*
+ * Find the the right timing table from the array of timing
+ * tables of the device using DDR clock frequency
+ */
+static const struct lpddr2_ac_timings *get_timings_table(const struct
+			lpddr2_ac_timings const *const *device_timings,
+			u32 freq)
+{
+	u32 i, temp, freq_nearest;
+	const struct lpddr2_ac_timings *timings = 0;
+
+	emif_assert(freq <= MAX_LPDDR2_FREQ);
+	emif_assert(device_timings);
+
+	/*
+	 * Start with the maximum allowed frequency - that is always safe
+	 */
+	freq_nearest = MAX_LPDDR2_FREQ;
+	/*
+	 * Find the timings table that has the max frequency value:
+	 *   i.  Above or equal to the DDR frequency - safe
+	 *   ii. The lowest that satisfies condition (i) - optimal
+	 */
+	for (i = 0; (i < MAX_NUM_SPEEDBINS) && device_timings[i]; i++) {
+		temp = device_timings[i]->max_freq;
+		if ((temp >= freq) && (temp <= freq_nearest)) {
+			freq_nearest = temp;
+			timings = device_timings[i];
+		}
+	}
+	debug("emif: timings table: %d\n", freq_nearest);
+	return timings;
+}
+
+/*
+ * Finds the value of emif_sdram_config_reg
+ * All parameters are programmed based on the device on CS0.
+ * If there is a device on CS1, it will be same as that on CS0 or
+ * it will be NVM. We don't support NVM yet.
+ * If cs1_device pointer is NULL it is assumed that there is no device
+ * on CS1
+ */
+static u32 get_sdram_config_reg(const struct lpddr2_device_details *cs0_device,
+				const struct lpddr2_device_details *cs1_device,
+				const struct lpddr2_addressing *addressing,
+				u8 RL)
+{
+	u32 config_reg = 0;
+
+	config_reg |=  (cs0_device->type + 4) << OMAP44XX_REG_SDRAM_TYPE_SHIFT;
+	config_reg |=  EMIF_INTERLEAVING_POLICY_MAX_INTERLEAVING <<
+			OMAP44XX_REG_IBANK_POS_SHIFT;
+
+	config_reg |= cs0_device->io_width << OMAP44XX_REG_NARROW_MODE_SHIFT;
+
+	config_reg |= RL << OMAP44XX_REG_CL_SHIFT;
+
+	config_reg |= addressing->row_sz[cs0_device->io_width] <<
+			OMAP44XX_REG_ROWSIZE_SHIFT;
+
+	config_reg |= addressing->num_banks << OMAP44XX_REG_IBANK_SHIFT;
+
+	config_reg |= (cs1_device ? EBANK_CS1_EN : EBANK_CS1_DIS) <<
+			OMAP44XX_REG_EBANK_SHIFT;
+
+	config_reg |= addressing->col_sz[cs0_device->io_width] <<
+			OMAP44XX_REG_PAGESIZE_SHIFT;
+
+	return config_reg;
+}
+
+static u32 get_sdram_ref_ctrl(u32 freq,
+			      const struct lpddr2_addressing *addressing)
+{
+	u32 ref_ctrl = 0, val = 0, freq_khz;
+	freq_khz = freq / 1000;
+	/*
+	 * refresh rate to be set is 'tREFI * freq in MHz
+	 * division by 10000 to account for khz and x10 in t_REFI_us_x10
+	 */
+	val = addressing->t_REFI_us_x10 * freq_khz / 10000;
+	ref_ctrl |= val << OMAP44XX_REG_REFRESH_RATE_SHIFT;
+
+	return ref_ctrl;
+}
+
+static u32 get_sdram_tim_1_reg(const struct lpddr2_ac_timings *timings,
+			       const struct lpddr2_min_tck *min_tck,
+			       const struct lpddr2_addressing *addressing)
+{
+	u32 tim1 = 0, val = 0;
+	val = max(min_tck->tWTR, ns_x2_2_cycles(timings->tWTRx2)) - 1;
+	tim1 |= val << OMAP44XX_REG_T_WTR_SHIFT;
+
+	if (addressing->num_banks == BANKS8)
+		val = (timings->tFAW * (*T_den) + 4 * (*T_num) - 1) /
+							(4 * (*T_num)) - 1;
+	else
+		val = max(min_tck->tRRD, ns_2_cycles(timings->tRRD)) - 1;
+
+	tim1 |= val << OMAP44XX_REG_T_RRD_SHIFT;
+
+	val = ns_2_cycles(timings->tRASmin + timings->tRPab) - 1;
+	tim1 |= val << OMAP44XX_REG_T_RC_SHIFT;
+
+	val = max(min_tck->tRAS_MIN, ns_2_cycles(timings->tRASmin)) - 1;
+	tim1 |= val << OMAP44XX_REG_T_RAS_SHIFT;
+
+	val = max(min_tck->tWR, ns_2_cycles(timings->tWR)) - 1;
+	tim1 |= val << OMAP44XX_REG_T_WR_SHIFT;
+
+	val = max(min_tck->tRCD, ns_2_cycles(timings->tRCD)) - 1;
+	tim1 |= val << OMAP44XX_REG_T_RCD_SHIFT;
+
+	val = max(min_tck->tRP_AB, ns_2_cycles(timings->tRPab)) - 1;
+	tim1 |= val << OMAP44XX_REG_T_RP_SHIFT;
+
+	return tim1;
+}
+
+static u32 get_sdram_tim_2_reg(const struct lpddr2_ac_timings *timings,
+			       const struct lpddr2_min_tck *min_tck)
+{
+	u32 tim2 = 0, val = 0;
+	val = max(min_tck->tCKE, timings->tCKE) - 1;
+	tim2 |= val << OMAP44XX_REG_T_CKE_SHIFT;
+
+	val = max(min_tck->tRTP, ns_x2_2_cycles(timings->tRTPx2)) - 1;
+	tim2 |= val << OMAP44XX_REG_T_RTP_SHIFT;
+
+	/*
+	 * tXSRD = tRFCab + 10 ns. XSRD and XSNR should have the
+	 * same value
+	 */
+	val = ns_2_cycles(timings->tXSR) - 1;
+	tim2 |= val << OMAP44XX_REG_T_XSRD_SHIFT;
+	tim2 |= val << OMAP44XX_REG_T_XSNR_SHIFT;
+
+	val = max(min_tck->tXP, ns_x2_2_cycles(timings->tXPx2)) - 1;
+	tim2 |= val << OMAP44XX_REG_T_XP_SHIFT;
+
+	return tim2;
+}
+
+static u32 get_sdram_tim_3_reg(const struct lpddr2_ac_timings *timings,
+			       const struct lpddr2_min_tck *min_tck,
+			       const struct lpddr2_addressing *addressing)
+{
+	u32 tim3 = 0, val = 0;
+	val = min(timings->tRASmax * 10 / addressing->t_REFI_us_x10 - 1, 0xF);
+	tim3 |= val << OMAP44XX_REG_T_RAS_MAX_SHIFT;
+
+	val = ns_2_cycles(timings->tRFCab) - 1;
+	tim3 |= val << OMAP44XX_REG_T_RFC_SHIFT;
+
+	val = ns_x2_2_cycles(timings->tDQSCKMAXx2) - 1;
+	tim3 |= val << OMAP44XX_REG_T_TDQSCKMAX_SHIFT;
+
+	val = ns_2_cycles(timings->tZQCS) - 1;
+	tim3 |= val << OMAP44XX_REG_ZQ_ZQCS_SHIFT;
+
+	val = max(min_tck->tCKESR, ns_2_cycles(timings->tCKESR)) - 1;
+	tim3 |= val << OMAP44XX_REG_T_CKESR_SHIFT;
+
+	return tim3;
+}
+
+static u32 get_zq_config_reg(const struct lpddr2_device_details *cs1_device,
+			     const struct lpddr2_addressing *addressing,
+			     u8 volt_ramp)
+{
+	u32 zq = 0, val = 0;
+	if (volt_ramp)
+		val =
+		    EMIF_ZQCS_INTERVAL_DVFS_IN_US * 10 /
+		    addressing->t_REFI_us_x10;
+	else
+		val =
+		    EMIF_ZQCS_INTERVAL_NORMAL_IN_US * 10 /
+		    addressing->t_REFI_us_x10;
+	zq |= val << OMAP44XX_REG_ZQ_REFINTERVAL_SHIFT;
+
+	zq |= (REG_ZQ_ZQCL_MULT - 1) << OMAP44XX_REG_ZQ_ZQCL_MULT_SHIFT;
+
+	zq |= (REG_ZQ_ZQINIT_MULT - 1) << OMAP44XX_REG_ZQ_ZQINIT_MULT_SHIFT;
+
+	zq |= REG_ZQ_SFEXITEN_ENABLE << OMAP44XX_REG_ZQ_SFEXITEN_SHIFT;
+
+	/*
+	 * Assuming that two chipselects have a single calibration resistor
+	 * If there are indeed two calibration resistors, then this flag should
+	 * be enabled to take advantage of dual calibration feature.
+	 * This data should ideally come from board files. But considering
+	 * that none of the boards today have calibration resistors per CS,
+	 * it would be an unnecessary overhead.
+	 */
+	zq |= REG_ZQ_DUALCALEN_DISABLE << OMAP44XX_REG_ZQ_DUALCALEN_SHIFT;
+
+	zq |= REG_ZQ_CS0EN_ENABLE << OMAP44XX_REG_ZQ_CS0EN_SHIFT;
+
+	zq |= (cs1_device ? 1 : 0) << OMAP44XX_REG_ZQ_CS1EN_SHIFT;
+
+	return zq;
+}
+
+static u32 get_temp_alert_config(const struct lpddr2_device_details *cs1_device,
+				 const struct lpddr2_addressing *addressing,
+				 u8 is_derated)
+{
+	u32 alert = 0, interval;
+	interval =
+	    TEMP_ALERT_POLL_INTERVAL_MS * 10000 / addressing->t_REFI_us_x10;
+	if (is_derated)
+		interval *= 4;
+	alert |= interval << OMAP44XX_REG_TA_REFINTERVAL_SHIFT;
+
+	alert |= TEMP_ALERT_CONFIG_DEVCT_1 << OMAP44XX_REG_TA_DEVCNT_SHIFT;
+
+	alert |= TEMP_ALERT_CONFIG_DEVWDT_32 << OMAP44XX_REG_TA_DEVWDT_SHIFT;
+
+	alert |= 1 << OMAP44XX_REG_TA_SFEXITEN_SHIFT;
+
+	alert |= 1 << OMAP44XX_REG_TA_CS0EN_SHIFT;
+
+	alert |= (cs1_device ? 1 : 0) << OMAP44XX_REG_TA_CS1EN_SHIFT;
+
+	return alert;
+}
+
+static u32 get_read_idle_ctrl_reg(u8 volt_ramp)
+{
+	u32 idle = 0, val = 0;
+	if (volt_ramp)
+		val = ns_2_cycles(READ_IDLE_INTERVAL_DVFS) / 64 + 1;
+	else
+		/*Maximum value in normal conditions - suggested by hw team */
+		val = 0x1FF;
+	idle |= val << OMAP44XX_REG_READ_IDLE_INTERVAL_SHIFT;
+
+	idle |= EMIF_REG_READ_IDLE_LEN_VAL << OMAP44XX_REG_READ_IDLE_LEN_SHIFT;
+
+	return idle;
+}
+
+static u32 get_ddr_phy_ctrl_1(u32 freq, u8 RL)
+{
+	u32 phy = 0, val = 0;
+
+	phy |= (RL + 2) << OMAP44XX_REG_READ_LATENCY_SHIFT;
+
+	if (freq <= 100000000)
+		val = EMIF_DLL_SLAVE_DLY_CTRL_100_MHZ_AND_LESS;
+	else if (freq <= 200000000)
+		val = EMIF_DLL_SLAVE_DLY_CTRL_200_MHZ;
+	else
+		val = EMIF_DLL_SLAVE_DLY_CTRL_400_MHZ;
+	phy |= val << OMAP44XX_REG_DLL_SLAVE_DLY_CTRL_SHIFT;
+
+	/* Other fields are constant magic values. Hardcode them together */
+	phy |= EMIF_DDR_PHY_CTRL_1_BASE_VAL <<
+		OMAP44XX_EMIF_DDR_PHY_CTRL_1_BASE_VAL_SHIFT;
+
+	return phy;
+}
+
+static u32 get_emif_mem_size(struct emif_device_details *devices)
+{
+	u32 size_mbytes = 0, temp;
+
+	if (!devices)
+		return 0;
+
+	if (devices->cs0_device_details) {
+		temp = devices->cs0_device_details->density;
+		size_mbytes += lpddr2_density_2_size_in_mbytes[temp];
+	}
+
+	if (devices->cs1_device_details) {
+		temp = devices->cs1_device_details->density;
+		size_mbytes += lpddr2_density_2_size_in_mbytes[temp];
+	}
+	/* convert to bytes */
+	return size_mbytes << 20;
+}
+
+/* Gets the encoding corresponding to a given DMM section size */
+u32 get_dmm_section_size_map(u32 section_size)
+{
+	/*
+	 * Section size mapping:
+	 * 0x0: 16-MiB section
+	 * 0x1: 32-MiB section
+	 * 0x2: 64-MiB section
+	 * 0x3: 128-MiB section
+	 * 0x4: 256-MiB section
+	 * 0x5: 512-MiB section
+	 * 0x6: 1-GiB section
+	 * 0x7: 2-GiB section
+	 */
+	section_size >>= 24; /* divide by 16 MB */
+	return log_2_n_round_down(section_size);
+}
+
+static void emif_calculate_regs(
+		const struct emif_device_details *emif_dev_details,
+		u32 freq, struct emif_regs *regs)
+{
+	u32 temp, sys_freq;
+	const struct lpddr2_addressing *addressing;
+	const struct lpddr2_ac_timings *timings;
+	const struct lpddr2_min_tck *min_tck;
+	const struct lpddr2_device_details *cs0_dev_details =
+					emif_dev_details->cs0_device_details;
+	const struct lpddr2_device_details *cs1_dev_details =
+					emif_dev_details->cs1_device_details;
+	const struct lpddr2_device_timings *cs0_dev_timings =
+					emif_dev_details->cs0_device_timings;
+
+	emif_assert(emif_dev_details);
+	emif_assert(regs);
+	/*
+	 * You can not have a device on CS1 without one on CS0
+	 * So configuring EMIF without a device on CS0 doesn't
+	 * make sense
+	 */
+	emif_assert(cs0_dev_details);
+	emif_assert(cs0_dev_details->type != LPDDR2_TYPE_NVM);
+	/*
+	 * If there is a device on CS1 it should be same type as CS0
+	 * (or NVM. But NVM is not supported in this driver yet)
+	 */
+	emif_assert((cs1_dev_details == NULL) ||
+		    (cs1_dev_details->type == LPDDR2_TYPE_NVM) ||
+		    (cs0_dev_details->type == cs1_dev_details->type));
+	emif_assert(freq <= MAX_LPDDR2_FREQ);
+
+	set_ddr_clk_period(freq);
+
+	/*
+	 * The device on CS0 is used for all timing calculations
+	 * There is only one set of registers for timings per EMIF. So, if the
+	 * second CS(CS1) has a device, it should have the same timings as the
+	 * device on CS0
+	 */
+	timings = get_timings_table(cs0_dev_timings->ac_timings, freq);
+	emif_assert(timings);
+	min_tck = cs0_dev_timings->min_tck;
+
+	temp = addressing_table_index(cs0_dev_details->type,
+				      cs0_dev_details->density,
+				      cs0_dev_details->io_width);
+
+	emif_assert((temp >= 0));
+	addressing = &(addressing_table[temp]);
+	emif_assert(addressing);
+
+	sys_freq = get_sys_clk_freq();
+
+	regs->sdram_config_init = get_sdram_config_reg(cs0_dev_details,
+							cs1_dev_details,
+							addressing, RL_BOOT);
+
+	regs->sdram_config = get_sdram_config_reg(cs0_dev_details,
+						cs1_dev_details,
+						addressing, RL_FINAL);
+
+	regs->ref_ctrl = get_sdram_ref_ctrl(freq, addressing);
+
+	regs->sdram_tim1 = get_sdram_tim_1_reg(timings, min_tck, addressing);
+
+	regs->sdram_tim2 = get_sdram_tim_2_reg(timings, min_tck);
+
+	regs->sdram_tim3 = get_sdram_tim_3_reg(timings, min_tck, addressing);
+
+	regs->read_idle_ctrl = get_read_idle_ctrl_reg(LPDDR2_VOLTAGE_STABLE);
+
+	regs->temp_alert_config =
+	    get_temp_alert_config(cs1_dev_details, addressing, 0);
+
+	regs->zq_config = get_zq_config_reg(cs1_dev_details, addressing,
+					    LPDDR2_VOLTAGE_STABLE);
+
+	regs->emif_ddr_phy_ctlr_1_init =
+			get_ddr_phy_ctrl_1(sys_freq / 2, RL_BOOT);
+
+	regs->emif_ddr_phy_ctlr_1 =
+			get_ddr_phy_ctrl_1(freq, RL_FINAL);
+
+	regs->freq = freq;
+
+	print_timing_reg(regs->sdram_config_init);
+	print_timing_reg(regs->sdram_config);
+	print_timing_reg(regs->ref_ctrl);
+	print_timing_reg(regs->sdram_tim1);
+	print_timing_reg(regs->sdram_tim2);
+	print_timing_reg(regs->sdram_tim3);
+	print_timing_reg(regs->read_idle_ctrl);
+	print_timing_reg(regs->temp_alert_config);
+	print_timing_reg(regs->zq_config);
+	print_timing_reg(regs->emif_ddr_phy_ctlr_1);
+	print_timing_reg(regs->emif_ddr_phy_ctlr_1_init);
+}
+#endif /* CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS */
+
+#ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
+/* Base AC Timing values specified by JESD209-2 for 400MHz operation */
+static const struct lpddr2_ac_timings timings_jedec_400_mhz = {
+	.max_freq = 400000000,
+	.RL = 6,
+	.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
+};
+
+/* Base AC Timing values specified by JESD209-2 for 333 MHz operation */
+static const struct lpddr2_ac_timings timings_jedec_333_mhz = {
+	.max_freq = 333000000,
+	.RL = 5,
+	.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
+};
+
+/* Base AC Timing values specified by JESD209-2 for 200 MHz operation */
+static const struct lpddr2_ac_timings timings_jedec_200_mhz = {
+	.max_freq = 200000000,
+	.RL = 3,
+	.tRPab = 21,
+	.tRCD = 18,
+	.tWR = 15,
+	.tRASmin = 42,
+	.tRRD = 10,
+	.tWTRx2 = 20,
+	.tXSR = 140,
+	.tXPx2 = 15,
+	.tRFCab = 130,
+	.tRTPx2 = 15,
+	.tCKE = 3,
+	.tCKESR = 15,
+	.tZQCS = 90,
+	.tZQCL = 360,
+	.tZQINIT = 1000,
+	.tDQSCKMAXx2 = 11,
+	.tRASmax = 70,
+	.tFAW = 50
+};
+
+/*
+ * Min tCK values specified by JESD209-2
+ * Min tCK specifies the minimum duration of some AC timing parameters in terms
+ * of the number of cycles. If the calculated number of cycles based on the
+ * absolute time value is less than the min tCK value, min tCK value should
+ * be used instead. This typically happens at low frequencies.
+ */
+static const struct lpddr2_min_tck min_tck_jedec = {
+	.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 const*
+			jedec_ac_timings[MAX_NUM_SPEEDBINS] = {
+	&timings_jedec_200_mhz,
+	&timings_jedec_333_mhz,
+	&timings_jedec_400_mhz
+};
+
+static const struct lpddr2_device_timings jedec_default_timings = {
+	.ac_timings = jedec_ac_timings,
+	.min_tck = &min_tck_jedec
+};
+
+void emif_get_device_timings(u32 emif_nr,
+		const struct lpddr2_device_timings **cs0_device_timings,
+		const struct lpddr2_device_timings **cs1_device_timings)
+{
+	/* Assume Identical devices on EMIF1 & EMIF2 */
+	*cs0_device_timings = &jedec_default_timings;
+	*cs1_device_timings = &jedec_default_timings;
+}
+#endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */
+
 static void do_sdram_init(u32 base)
 {
 	const struct emif_regs *regs;
@@ -180,11 +802,54 @@ static void do_sdram_init(u32 base)
 	in_sdram = running_from_sdram();
 	emif_nr = (base == OMAP44XX_EMIF1) ? 1 : 2;
 
+#ifdef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
 	emif_get_reg_dump(emif_nr, &regs);
 	if (!regs) {
 		debug("EMIF: reg dump not provided\n");
 		return;
 	}
+#else
+	/*
+	 * The user has not provided the register values. We need to
+	 * calculate it based on the timings and the DDR frequency
+	 */
+	struct emif_device_details dev_details;
+	struct emif_regs calculated_regs;
+
+	/*
+	 * Get device details:
+	 * - Discovered if CONFIG_SYS_AUTOMATIC_SDRAM_DETECTION is set
+	 * - Obtained from user otherwise
+	 */
+	struct lpddr2_device_details cs0_dev_details, cs1_dev_details;
+	emif_get_device_details(emif_nr, &cs0_dev_details,
+				&cs1_dev_details);
+	dev_details.cs0_device_details = &cs0_dev_details;
+	dev_details.cs1_device_details = &cs1_dev_details;
+
+	/* Return if no devices on this EMIF */
+	if (!dev_details.cs0_device_details &&
+	    !dev_details.cs1_device_details) {
+		emif_sizes[emif_nr - 1] = 0;
+		return;
+	}
+
+	if (!in_sdram)
+		emif_sizes[emif_nr - 1] = get_emif_mem_size(&dev_details);
+
+	/*
+	 * Get device timings:
+	 * - Default timings specified by JESD209-2 if
+	 *   CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS is set
+	 * - Obtained from user otherwise
+	 */
+	emif_get_device_timings(emif_nr, &dev_details.cs0_device_timings,
+				&dev_details.cs1_device_timings);
+
+	/* Calculate the register values */
+	emif_calculate_regs(&dev_details, omap4_ddr_clk(), &calculated_regs);
+	regs = &calculated_regs;
+#endif /* CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS */
 
 	/*
 	 * Initializing the LPDDR2 device can not happen from SDRAM.
@@ -242,8 +907,82 @@ static void dmm_init(u32 base)
 {
 	const struct dmm_lisa_map_regs *lisa_map_regs;
 
+#ifdef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
 	emif_get_dmm_regs(&lisa_map_regs);
+#else
+	u32 emif1_size, emif2_size, mapped_size, section_map = 0;
+	u32 section_cnt, sys_addr;
+	struct dmm_lisa_map_regs lis_map_regs_calculated = {0};
+
+	mapped_size = 0;
+	section_cnt = 3;
+	sys_addr = CONFIG_SYS_SDRAM_BASE;
+	emif1_size = emif_sizes[0];
+	emif2_size = emif_sizes[1];
+	debug("emif1_size 0x%x emif2_size 0x%x\n", emif1_size, emif2_size);
+
+	if (!emif1_size && !emif2_size)
+		return;
+
+	/* symmetric interleaved section */
+	if (emif1_size && emif2_size) {
+		mapped_size = min(emif1_size, emif2_size);
+		section_map = DMM_LISA_MAP_INTERLEAVED_BASE_VAL;
+		section_map |= 0 << OMAP44XX_SDRC_ADDR_SHIFT;
+		/* only MSB */
+		section_map |= (sys_addr >> 24) <<
+				OMAP44XX_SYS_ADDR_SHIFT;
+		section_map |= get_dmm_section_size_map(mapped_size * 2)
+				<< OMAP44XX_SYS_SIZE_SHIFT;
+		lis_map_regs_calculated.dmm_lisa_map_3 = section_map;
+		emif1_size -= mapped_size;
+		emif2_size -= mapped_size;
+		sys_addr += (mapped_size * 2);
+		section_cnt--;
+	}
+
+	/*
+	 * Single EMIF section(we can have a maximum of 1 single EMIF
+	 * section- either EMIF1 or EMIF2 or none, but not both)
+	 */
+	if (emif1_size) {
+		section_map = DMM_LISA_MAP_EMIF1_ONLY_BASE_VAL;
+		section_map |= get_dmm_section_size_map(emif1_size)
+				<< OMAP44XX_SYS_SIZE_SHIFT;
+		/* only MSB */
+		section_map |= (mapped_size >> 24) <<
+				OMAP44XX_SDRC_ADDR_SHIFT;
+		/* only MSB */
+		section_map |= (sys_addr >> 24) << OMAP44XX_SYS_ADDR_SHIFT;
+		section_cnt--;
+	}
+	if (emif2_size) {
+		section_map = DMM_LISA_MAP_EMIF2_ONLY_BASE_VAL;
+		section_map |= get_dmm_section_size_map(emif2_size) <<
+				OMAP44XX_SYS_SIZE_SHIFT;
+		/* only MSB */
+		section_map |= mapped_size >> 24 << OMAP44XX_SDRC_ADDR_SHIFT;
+		/* only MSB */
+		section_map |= sys_addr >> 24 << OMAP44XX_SYS_ADDR_SHIFT;
+		section_cnt--;
+	}
+
+	if (section_cnt == 2) {
+		/* Only 1 section - either symmetric or single EMIF */
+		lis_map_regs_calculated.dmm_lisa_map_3 = section_map;
+		lis_map_regs_calculated.dmm_lisa_map_2 = 0;
+		lis_map_regs_calculated.dmm_lisa_map_1 = 0;
+	} else {
+		/* 2 sections - 1 symmetric, 1 single EMIF */
+		lis_map_regs_calculated.dmm_lisa_map_2 = section_map;
+		lis_map_regs_calculated.dmm_lisa_map_1 = 0;
+	}
+
+	/* TRAP for invalid TILER mappings in section 0 */
+	lis_map_regs_calculated.dmm_lisa_map_0 = DMM_LISA_MAP_0_INVAL_ADDR_TRAP;
 
+	lisa_map_regs = &lis_map_regs_calculated;
+#endif
 	struct dmm_lisa_map_regs *hw_lisa_map_regs =
 	    (struct dmm_lisa_map_regs *)base;
 
diff --git a/arch/arm/cpu/armv7/omap4/sdram_elpida.c b/arch/arm/cpu/armv7/omap4/sdram_elpida.c
index c950c87446..7757aad2ba 100644
--- a/arch/arm/cpu/armv7/omap4/sdram_elpida.c
+++ b/arch/arm/cpu/armv7/omap4/sdram_elpida.c
@@ -46,6 +46,8 @@
  * - emif_get_device_timings()
  */
 
+#ifdef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
+
 static const struct emif_regs emif_regs_elpida_200_mhz_2cs = {
 	.sdram_config_init		= 0x80000eb9,
 	.sdram_config			= 0x80001ab9,
@@ -129,3 +131,152 @@ static void emif_get_dmm_regs_sdp(const struct dmm_lisa_map_regs
 
 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 elpida_2G_S4_details = {
+	.type		= LPDDR2_TYPE_S4,
+	.density	= LPDDR2_DENSITY_2Gb,
+	.io_width	= LPDDR2_IO_WIDTH_32,
+	.manufacturer	= LPDDR2_MANUFACTURER_ELPIDA
+};
+
+static void emif_get_device_details_sdp(u32 emif_nr,
+		struct lpddr2_device_details *cs0_device_details,
+		struct lpddr2_device_details *cs1_device_details)
+{
+	u32 omap_rev = omap_revision();
+
+	/* EMIF1 & EMIF2 have identical configuration */
+	*cs0_device_details = elpida_2G_S4_details;
+
+	if (omap_rev == OMAP4430_ES1_0)
+		cs1_device_details = NULL;
+	else
+		*cs1_device_details = elpida_2G_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 */
+
+#ifndef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
+static const struct lpddr2_ac_timings timings_elpida_400_mhz = {
+	.max_freq	= 400000000,
+	.RL		= 6,
+	.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_ac_timings timings_elpida_333_mhz = {
+	.max_freq	= 333000000,
+	.RL		= 5,
+	.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_ac_timings timings_elpida_200_mhz = {
+	.max_freq	= 200000000,
+	.RL		= 3,
+	.tRPab		= 21,
+	.tRCD		= 18,
+	.tWR		= 15,
+	.tRASmin	= 42,
+	.tRRD		= 10,
+	.tWTRx2		= 20,
+	.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_elpida = {
+	.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 *elpida_ac_timings[MAX_NUM_SPEEDBINS] = {
+		&timings_elpida_200_mhz,
+		&timings_elpida_333_mhz,
+		&timings_elpida_400_mhz
+};
+
+static const struct lpddr2_device_timings elpida_2G_S4_timings = {
+	.ac_timings	= elpida_ac_timings,
+	.min_tck	= &min_tck_elpida,
+};
+
+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)
+{
+	u32 omap_rev = omap_revision();
+
+	/* Identical devices on EMIF1 & EMIF2 */
+	*cs0_device_timings = &elpida_2G_S4_timings;
+
+	if (omap_rev == OMAP4430_ES1_0)
+		*cs1_device_timings = NULL;
+	else
+		*cs1_device_timings = &elpida_2G_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 */