arm: vf610: add uart0 clock/iomux definitions

[u-boot/qq2440-u-boot.git] / drivers / ddr / fsl / main.c

/*
 * Copyright 2008-2012 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * Version 2 as published by the Free Software Foundation.
 */

/*
 * Generic driver for Freescale DDR/DDR2/DDR3 memory controller.
 * Based on code from spd_sdram.c
 * Author: James Yang [at freescale.com]
 */

#include <common.h>
#include <i2c.h>
#include <fsl_ddr_sdram.h>
#include <fsl_ddr.h>

/*
 * CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY is the physical address from the view
 * of DDR controllers. It is the same as CONFIG_SYS_DDR_SDRAM_BASE for
 * all Power SoCs. But it could be different for ARM SoCs. For example,
 * fsl_lsch3 has a mapping mechanism to map DDR memory to ranges (in order) of
 * 0x00_8000_0000 ~ 0x00_ffff_ffff
 * 0x80_8000_0000 ~ 0xff_ffff_ffff
 */
#ifndef CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY
#define CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY CONFIG_SYS_DDR_SDRAM_BASE
#endif

#ifdef CONFIG_PPC
#include <asm/fsl_law.h>

void fsl_ddr_set_lawbar(
                const common_timing_params_t *memctl_common_params,
                unsigned int memctl_interleaved,
                unsigned int ctrl_num);
#endif

void fsl_ddr_set_intl3r(const unsigned int granule_size);
#if defined(SPD_EEPROM_ADDRESS) || \
    defined(SPD_EEPROM_ADDRESS1) || defined(SPD_EEPROM_ADDRESS2) || \
    defined(SPD_EEPROM_ADDRESS3) || defined(SPD_EEPROM_ADDRESS4)
#if (CONFIG_NUM_DDR_CONTROLLERS == 1) && (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
        [0][0] = SPD_EEPROM_ADDRESS,
};
#elif (CONFIG_NUM_DDR_CONTROLLERS == 1) && (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
        [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
        [0][1] = SPD_EEPROM_ADDRESS2,   /* controller 1 */
};
#elif (CONFIG_NUM_DDR_CONTROLLERS == 2) && (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
        [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
        [1][0] = SPD_EEPROM_ADDRESS2,   /* controller 2 */
};
#elif (CONFIG_NUM_DDR_CONTROLLERS == 2) && (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
        [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
        [0][1] = SPD_EEPROM_ADDRESS2,   /* controller 1 */
        [1][0] = SPD_EEPROM_ADDRESS3,   /* controller 2 */
        [1][1] = SPD_EEPROM_ADDRESS4,   /* controller 2 */
};
#elif (CONFIG_NUM_DDR_CONTROLLERS == 3) && (CONFIG_DIMM_SLOTS_PER_CTLR == 1)
u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
        [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
        [1][0] = SPD_EEPROM_ADDRESS2,   /* controller 2 */
        [2][0] = SPD_EEPROM_ADDRESS3,   /* controller 3 */
};
#elif (CONFIG_NUM_DDR_CONTROLLERS == 3) && (CONFIG_DIMM_SLOTS_PER_CTLR == 2)
u8 spd_i2c_addr[CONFIG_NUM_DDR_CONTROLLERS][CONFIG_DIMM_SLOTS_PER_CTLR] = {
        [0][0] = SPD_EEPROM_ADDRESS1,   /* controller 1 */
        [0][1] = SPD_EEPROM_ADDRESS2,   /* controller 1 */
        [1][0] = SPD_EEPROM_ADDRESS3,   /* controller 2 */
        [1][1] = SPD_EEPROM_ADDRESS4,   /* controller 2 */
        [2][0] = SPD_EEPROM_ADDRESS5,   /* controller 3 */
        [2][1] = SPD_EEPROM_ADDRESS6,   /* controller 3 */
};

#endif

static void __get_spd(generic_spd_eeprom_t *spd, u8 i2c_address)
{
        int ret;

        i2c_set_bus_num(CONFIG_SYS_SPD_BUS_NUM);

        ret = i2c_read(i2c_address, 0, 1, (uchar *)spd,
                                sizeof(generic_spd_eeprom_t));

        if (ret) {
                if (i2c_address ==
#ifdef SPD_EEPROM_ADDRESS
                                SPD_EEPROM_ADDRESS
#elif defined(SPD_EEPROM_ADDRESS1)
                                SPD_EEPROM_ADDRESS1
#endif
                                ) {
                        printf("DDR: failed to read SPD from address %u\n",
                                i2c_address);
                } else {
                        debug("DDR: failed to read SPD from address %u\n",
                                i2c_address);
                }
                memset(spd, 0, sizeof(generic_spd_eeprom_t));
        }
}

__attribute__((weak, alias("__get_spd")))
void get_spd(generic_spd_eeprom_t *spd, u8 i2c_address);

void fsl_ddr_get_spd(generic_spd_eeprom_t *ctrl_dimms_spd,
                      unsigned int ctrl_num)
{
        unsigned int i;
        unsigned int i2c_address = 0;

        if (ctrl_num >= CONFIG_NUM_DDR_CONTROLLERS) {
                printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num);
                return;
        }

        for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
                i2c_address = spd_i2c_addr[ctrl_num][i];
                get_spd(&(ctrl_dimms_spd[i]), i2c_address);
        }
}
#else
void fsl_ddr_get_spd(generic_spd_eeprom_t *ctrl_dimms_spd,
                      unsigned int ctrl_num)
{
}
#endif /* SPD_EEPROM_ADDRESSx */

/*
 * ASSUMPTIONS:
 *    - Same number of CONFIG_DIMM_SLOTS_PER_CTLR on each controller
 *    - Same memory data bus width on all controllers
 *
 * NOTES:
 *
 * The memory controller and associated documentation use confusing
 * terminology when referring to the orgranization of DRAM.
 *
 * Here is a terminology translation table:
 *
 * memory controller/documention  |industry   |this code  |signals
 * -------------------------------|-----------|-----------|-----------------
 * physical bank/bank             |rank       |rank       |chip select (CS)
 * logical bank/sub-bank          |bank       |bank       |bank address (BA)
 * page/row                       |row        |page       |row address
 * ???                            |column     |column     |column address
 *
 * The naming confusion is further exacerbated by the descriptions of the
 * memory controller interleaving feature, where accesses are interleaved
 * _BETWEEN_ two seperate memory controllers.  This is configured only in
 * CS0_CONFIG[INTLV_CTL] of each memory controller.
 *
 * memory controller documentation | number of chip selects
 *                                 | per memory controller supported
 * --------------------------------|-----------------------------------------
 * cache line interleaving         | 1 (CS0 only)
 * page interleaving               | 1 (CS0 only)
 * bank interleaving               | 1 (CS0 only)
 * superbank interleraving         | depends on bank (chip select)
 *                                 |   interleraving [rank interleaving]
 *                                 |   mode used on every memory controller
 *
 * Even further confusing is the existence of the interleaving feature
 * _WITHIN_ each memory controller.  The feature is referred to in
 * documentation as chip select interleaving or bank interleaving,
 * although it is configured in the DDR_SDRAM_CFG field.
 *
 * Name of field                | documentation name    | this code
 * -----------------------------|-----------------------|------------------
 * DDR_SDRAM_CFG[BA_INTLV_CTL]  | Bank (chip select)    | rank interleaving
 *                              |  interleaving
 */

const char *step_string_tbl[] = {
        "STEP_GET_SPD",
        "STEP_COMPUTE_DIMM_PARMS",
        "STEP_COMPUTE_COMMON_PARMS",
        "STEP_GATHER_OPTS",
        "STEP_ASSIGN_ADDRESSES",
        "STEP_COMPUTE_REGS",
        "STEP_PROGRAM_REGS",
        "STEP_ALL"
};

const char * step_to_string(unsigned int step) {

        unsigned int s = __ilog2(step);

        if ((1 << s) != step)
                return step_string_tbl[7];

        return step_string_tbl[s];
}

static unsigned long long __step_assign_addresses(fsl_ddr_info_t *pinfo,
                          unsigned int dbw_cap_adj[])
{
        int i, j;
        unsigned long long total_mem, current_mem_base, total_ctlr_mem;
        unsigned long long rank_density, ctlr_density = 0;

        /*
         * If a reduced data width is requested, but the SPD
         * specifies a physically wider device, adjust the
         * computed dimm capacities accordingly before
         * assigning addresses.
         */
        for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                unsigned int found = 0;

                switch (pinfo->memctl_opts[i].data_bus_width) {
                case 2:
                        /* 16-bit */
                        for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
                                unsigned int dw;
                                if (!pinfo->dimm_params[i][j].n_ranks)
                                        continue;
                                dw = pinfo->dimm_params[i][j].primary_sdram_width;
                                if ((dw == 72 || dw == 64)) {
                                        dbw_cap_adj[i] = 2;
                                        break;
                                } else if ((dw == 40 || dw == 32)) {
                                        dbw_cap_adj[i] = 1;
                                        break;
                                }
                        }
                        break;

                case 1:
                        /* 32-bit */
                        for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
                                unsigned int dw;
                                dw = pinfo->dimm_params[i][j].data_width;
                                if (pinfo->dimm_params[i][j].n_ranks
                                    && (dw == 72 || dw == 64)) {
                                        /*
                                         * FIXME: can't really do it
                                         * like this because this just
                                         * further reduces the memory
                                         */
                                        found = 1;
                                        break;
                                }
                        }
                        if (found) {
                                dbw_cap_adj[i] = 1;
                        }
                        break;

                case 0:
                        /* 64-bit */
                        break;

                default:
                        printf("unexpected data bus width "
                                "specified controller %u\n", i);
                        return 1;
                }
                debug("dbw_cap_adj[%d]=%d\n", i, dbw_cap_adj[i]);
        }

        current_mem_base = CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY;
        total_mem = 0;
        if (pinfo->memctl_opts[0].memctl_interleaving) {
                rank_density = pinfo->dimm_params[0][0].rank_density >>
                                        dbw_cap_adj[0];
                switch (pinfo->memctl_opts[0].ba_intlv_ctl &
                                        FSL_DDR_CS0_CS1_CS2_CS3) {
                case FSL_DDR_CS0_CS1_CS2_CS3:
                        ctlr_density = 4 * rank_density;
                        break;
                case FSL_DDR_CS0_CS1:
                case FSL_DDR_CS0_CS1_AND_CS2_CS3:
                        ctlr_density = 2 * rank_density;
                        break;
                case FSL_DDR_CS2_CS3:
                default:
                        ctlr_density = rank_density;
                        break;
                }
                debug("rank density is 0x%llx, ctlr density is 0x%llx\n",
                        rank_density, ctlr_density);
                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        if (pinfo->memctl_opts[i].memctl_interleaving) {
                                switch (pinfo->memctl_opts[i].memctl_interleaving_mode) {
                                case FSL_DDR_256B_INTERLEAVING:
                                case FSL_DDR_CACHE_LINE_INTERLEAVING:
                                case FSL_DDR_PAGE_INTERLEAVING:
                                case FSL_DDR_BANK_INTERLEAVING:
                                case FSL_DDR_SUPERBANK_INTERLEAVING:
                                        total_ctlr_mem = 2 * ctlr_density;
                                        break;
                                case FSL_DDR_3WAY_1KB_INTERLEAVING:
                                case FSL_DDR_3WAY_4KB_INTERLEAVING:
                                case FSL_DDR_3WAY_8KB_INTERLEAVING:
                                        total_ctlr_mem = 3 * ctlr_density;
                                        break;
                                case FSL_DDR_4WAY_1KB_INTERLEAVING:
                                case FSL_DDR_4WAY_4KB_INTERLEAVING:
                                case FSL_DDR_4WAY_8KB_INTERLEAVING:
                                        total_ctlr_mem = 4 * ctlr_density;
                                        break;
                                default:
                                        panic("Unknown interleaving mode");
                                }
                                pinfo->common_timing_params[i].base_address =
                                                        current_mem_base;
                                pinfo->common_timing_params[i].total_mem =
                                                        total_ctlr_mem;
                                total_mem = current_mem_base + total_ctlr_mem;
                                debug("ctrl %d base 0x%llx\n", i, current_mem_base);
                                debug("ctrl %d total 0x%llx\n", i, total_ctlr_mem);
                        } else {
                                /* when 3rd controller not interleaved */
                                current_mem_base = total_mem;
                                total_ctlr_mem = 0;
                                pinfo->common_timing_params[i].base_address =
                                                        current_mem_base;
                                for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
                                        unsigned long long cap =
                                                pinfo->dimm_params[i][j].capacity >> dbw_cap_adj[i];
                                        pinfo->dimm_params[i][j].base_address =
                                                current_mem_base;
                                        debug("ctrl %d dimm %d base 0x%llx\n", i, j, current_mem_base);
                                        current_mem_base += cap;
                                        total_ctlr_mem += cap;
                                }
                                debug("ctrl %d total 0x%llx\n", i, total_ctlr_mem);
                                pinfo->common_timing_params[i].total_mem =
                                                        total_ctlr_mem;
                                total_mem += total_ctlr_mem;
                        }
                }
        } else {
                /*
                 * Simple linear assignment if memory
                 * controllers are not interleaved.
                 */
                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        total_ctlr_mem = 0;
                        pinfo->common_timing_params[i].base_address =
                                                current_mem_base;
                        for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
                                /* Compute DIMM base addresses. */
                                unsigned long long cap =
                                        pinfo->dimm_params[i][j].capacity >> dbw_cap_adj[i];
                                pinfo->dimm_params[i][j].base_address =
                                        current_mem_base;
                                debug("ctrl %d dimm %d base 0x%llx\n", i, j, current_mem_base);
                                current_mem_base += cap;
                                total_ctlr_mem += cap;
                        }
                        debug("ctrl %d total 0x%llx\n", i, total_ctlr_mem);
                        pinfo->common_timing_params[i].total_mem =
                                                        total_ctlr_mem;
                        total_mem += total_ctlr_mem;
                }
        }
        debug("Total mem by %s is 0x%llx\n", __func__, total_mem);

        return total_mem;
}

/* Use weak function to allow board file to override the address assignment */
__attribute__((weak, alias("__step_assign_addresses")))
unsigned long long step_assign_addresses(fsl_ddr_info_t *pinfo,
                          unsigned int dbw_cap_adj[]);

unsigned long long
fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step,
                                       unsigned int size_only)
{
        unsigned int i, j;
        unsigned long long total_mem = 0;
        int assert_reset;

        fsl_ddr_cfg_regs_t *ddr_reg = pinfo->fsl_ddr_config_reg;
        common_timing_params_t *timing_params = pinfo->common_timing_params;
        assert_reset = board_need_mem_reset();

        /* data bus width capacity adjust shift amount */
        unsigned int dbw_capacity_adjust[CONFIG_NUM_DDR_CONTROLLERS];

        for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                dbw_capacity_adjust[i] = 0;
        }

        debug("starting at step %u (%s)\n",
              start_step, step_to_string(start_step));

        switch (start_step) {
        case STEP_GET_SPD:
#if defined(CONFIG_DDR_SPD) || defined(CONFIG_SPD_EEPROM)
                /* STEP 1:  Gather all DIMM SPD data */
                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        fsl_ddr_get_spd(pinfo->spd_installed_dimms[i], i);
                }

        case STEP_COMPUTE_DIMM_PARMS:
                /* STEP 2:  Compute DIMM parameters from SPD data */

                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
                                unsigned int retval;
                                generic_spd_eeprom_t *spd =
                                        &(pinfo->spd_installed_dimms[i][j]);
                                dimm_params_t *pdimm =
                                        &(pinfo->dimm_params[i][j]);

                                retval = compute_dimm_parameters(spd, pdimm, i);
#ifdef CONFIG_SYS_DDR_RAW_TIMING
                                if (!i && !j && retval) {
                                        printf("SPD error on controller %d! "
                                        "Trying fallback to raw timing "
                                        "calculation\n", i);
                                        fsl_ddr_get_dimm_params(pdimm, i, j);
                                }
#else
                                if (retval == 2) {
                                        printf("Error: compute_dimm_parameters"
                                        " non-zero returned FATAL value "
                                        "for memctl=%u dimm=%u\n", i, j);
                                        return 0;
                                }
#endif
                                if (retval) {
                                        debug("Warning: compute_dimm_parameters"
                                        " non-zero return value for memctl=%u "
                                        "dimm=%u\n", i, j);
                                }
                        }
                }

#elif defined(CONFIG_SYS_DDR_RAW_TIMING)
        case STEP_COMPUTE_DIMM_PARMS:
                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) {
                                dimm_params_t *pdimm =
                                        &(pinfo->dimm_params[i][j]);
                                fsl_ddr_get_dimm_params(pdimm, i, j);
                        }
                }
                debug("Filling dimm parameters from board specific file\n");
#endif
        case STEP_COMPUTE_COMMON_PARMS:
                /*
                 * STEP 3: Compute a common set of timing parameters
                 * suitable for all of the DIMMs on each memory controller
                 */
                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        debug("Computing lowest common DIMM"
                                " parameters for memctl=%u\n", i);
                        compute_lowest_common_dimm_parameters(
                                pinfo->dimm_params[i],
                                &timing_params[i],
                                CONFIG_DIMM_SLOTS_PER_CTLR);
                }

        case STEP_GATHER_OPTS:
                /* STEP 4:  Gather configuration requirements from user */
                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        debug("Reloading memory controller "
                                "configuration options for memctl=%u\n", i);
                        /*
                         * This "reloads" the memory controller options
                         * to defaults.  If the user "edits" an option,
                         * next_step points to the step after this,
                         * which is currently STEP_ASSIGN_ADDRESSES.
                         */
                        populate_memctl_options(
                                        timing_params[i].all_dimms_registered,
                                        &pinfo->memctl_opts[i],
                                        pinfo->dimm_params[i], i);
                        /*
                         * For RDIMMs, JEDEC spec requires clocks to be stable
                         * before reset signal is deasserted. For the boards
                         * using fixed parameters, this function should be
                         * be called from board init file.
                         */
                        if (timing_params[i].all_dimms_registered)
                                assert_reset = 1;
                }
                if (assert_reset) {
                        debug("Asserting mem reset\n");
                        board_assert_mem_reset();
                }

        case STEP_ASSIGN_ADDRESSES:
                /* STEP 5:  Assign addresses to chip selects */
                check_interleaving_options(pinfo);
                total_mem = step_assign_addresses(pinfo, dbw_capacity_adjust);

        case STEP_COMPUTE_REGS:
                /* STEP 6:  compute controller register values */
                debug("FSL Memory ctrl register computation\n");
                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        if (timing_params[i].ndimms_present == 0) {
                                memset(&ddr_reg[i], 0,
                                        sizeof(fsl_ddr_cfg_regs_t));
                                continue;
                        }

                        compute_fsl_memctl_config_regs(
                                        &pinfo->memctl_opts[i],
                                        &ddr_reg[i], &timing_params[i],
                                        pinfo->dimm_params[i],
                                        dbw_capacity_adjust[i],
                                        size_only);
                }

        default:
                break;
        }

        {
                /*
                 * Compute the amount of memory available just by
                 * looking for the highest valid CSn_BNDS value.
                 * This allows us to also experiment with using
                 * only CS0 when using dual-rank DIMMs.
                 */
                unsigned int max_end = 0;

                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        for (j = 0; j < CONFIG_CHIP_SELECTS_PER_CTRL; j++) {
                                fsl_ddr_cfg_regs_t *reg = &ddr_reg[i];
                                if (reg->cs[j].config & 0x80000000) {
                                        unsigned int end;
                                        /*
                                         * 0xfffffff is a special value we put
                                         * for unused bnds
                                         */
                                        if (reg->cs[j].bnds == 0xffffffff)
                                                continue;
                                        end = reg->cs[j].bnds & 0xffff;
                                        if (end > max_end) {
                                                max_end = end;
                                        }
                                }
                        }
                }

                total_mem = 1 + (((unsigned long long)max_end << 24ULL) |
                            0xFFFFFFULL) - CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY;
        }

        return total_mem;
}

/*
 * fsl_ddr_sdram() -- this is the main function to be called by
 *      initdram() in the board file.
 *
 * It returns amount of memory configured in bytes.
 */
phys_size_t fsl_ddr_sdram(void)
{
        unsigned int i;
#ifdef CONFIG_PPC
        unsigned int law_memctl = LAW_TRGT_IF_DDR_1;
#endif
        unsigned long long total_memory;
        fsl_ddr_info_t info;
        int deassert_reset;

        /* Reset info structure. */
        memset(&info, 0, sizeof(fsl_ddr_info_t));

        /* Compute it once normally. */
#ifdef CONFIG_FSL_DDR_INTERACTIVE
        if (tstc() && (getc() == 'd')) {        /* we got a key press of 'd' */
                total_memory = fsl_ddr_interactive(&info, 0);
        } else if (fsl_ddr_interactive_env_var_exists()) {
                total_memory = fsl_ddr_interactive(&info, 1);
        } else
#endif
                total_memory = fsl_ddr_compute(&info, STEP_GET_SPD, 0);

        /* setup 3-way interleaving before enabling DDRC */
        if (info.memctl_opts[0].memctl_interleaving) {
                switch (info.memctl_opts[0].memctl_interleaving_mode) {
                case FSL_DDR_3WAY_1KB_INTERLEAVING:
                case FSL_DDR_3WAY_4KB_INTERLEAVING:
                case FSL_DDR_3WAY_8KB_INTERLEAVING:
                        fsl_ddr_set_intl3r(
                                info.memctl_opts[0].memctl_interleaving_mode);
                        break;
                default:
                        break;
                }
        }

        /*
         * Program configuration registers.
         * JEDEC specs requires clocks to be stable before deasserting reset
         * for RDIMMs. Clocks start after chip select is enabled and clock
         * control register is set. During step 1, all controllers have their
         * registers set but not enabled. Step 2 proceeds after deasserting
         * reset through board FPGA or GPIO.
         * For non-registered DIMMs, initialization can go through but it is
         * also OK to follow the same flow.
         */
        deassert_reset = board_need_mem_reset();
        for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                if (info.common_timing_params[i].all_dimms_registered)
                        deassert_reset = 1;
        }
        for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                debug("Programming controller %u\n", i);
                if (info.common_timing_params[i].ndimms_present == 0) {
                        debug("No dimms present on controller %u; "
                                        "skipping programming\n", i);
                        continue;
                }
                /*
                 * The following call with step = 1 returns before enabling
                 * the controller. It has to finish with step = 2 later.
                 */
                fsl_ddr_set_memctl_regs(&(info.fsl_ddr_config_reg[i]), i,
                                        deassert_reset ? 1 : 0);
        }
        if (deassert_reset) {
                /* Use board FPGA or GPIO to deassert reset signal */
                debug("Deasserting mem reset\n");
                board_deassert_mem_reset();
                for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                        /* Call with step = 2 to continue initialization */
                        fsl_ddr_set_memctl_regs(&(info.fsl_ddr_config_reg[i]),
                                                i, 2);
                }
        }

#ifdef CONFIG_PPC
        /* program LAWs */
        for (i = 0; i < CONFIG_NUM_DDR_CONTROLLERS; i++) {
                if (info.memctl_opts[i].memctl_interleaving) {
                        switch (info.memctl_opts[i].memctl_interleaving_mode) {
                        case FSL_DDR_CACHE_LINE_INTERLEAVING:
                        case FSL_DDR_PAGE_INTERLEAVING:
                        case FSL_DDR_BANK_INTERLEAVING:
                        case FSL_DDR_SUPERBANK_INTERLEAVING:
                                if (i == 0) {
                                        law_memctl = LAW_TRGT_IF_DDR_INTRLV;
                                        fsl_ddr_set_lawbar(&info.common_timing_params[i],
                                                law_memctl, i);
                                } else if (i == 2) {
                                        law_memctl = LAW_TRGT_IF_DDR_INTLV_34;
                                        fsl_ddr_set_lawbar(&info.common_timing_params[i],
                                                law_memctl, i);
                                }
                                break;
                        case FSL_DDR_3WAY_1KB_INTERLEAVING:
                        case FSL_DDR_3WAY_4KB_INTERLEAVING:
                        case FSL_DDR_3WAY_8KB_INTERLEAVING:
                                law_memctl = LAW_TRGT_IF_DDR_INTLV_123;
                                if (i == 0) {
                                        fsl_ddr_set_lawbar(&info.common_timing_params[i],
                                                law_memctl, i);
                                }
                                break;
                        case FSL_DDR_4WAY_1KB_INTERLEAVING:
                        case FSL_DDR_4WAY_4KB_INTERLEAVING:
                        case FSL_DDR_4WAY_8KB_INTERLEAVING:
                                law_memctl = LAW_TRGT_IF_DDR_INTLV_1234;
                                if (i == 0)
                                        fsl_ddr_set_lawbar(&info.common_timing_params[i],
                                                law_memctl, i);
                                /* place holder for future 4-way interleaving */
                                break;
                        default:
                                break;
                        }
                } else {
                        switch (i) {
                        case 0:
                                law_memctl = LAW_TRGT_IF_DDR_1;
                                break;
                        case 1:
                                law_memctl = LAW_TRGT_IF_DDR_2;
                                break;
                        case 2:
                                law_memctl = LAW_TRGT_IF_DDR_3;
                                break;
                        case 3:
                                law_memctl = LAW_TRGT_IF_DDR_4;
                                break;
                        default:
                                break;
                        }
                        fsl_ddr_set_lawbar(&info.common_timing_params[i],
                                        law_memctl, i);
                }
        }
#endif

        debug("total_memory by %s = %llu\n", __func__, total_memory);

#if !defined(CONFIG_PHYS_64BIT)
        /* Check for 4G or more.  Bad. */
        if (total_memory >= (1ull << 32)) {
                puts("Detected ");
                print_size(total_memory, " of memory\n");
                printf("       This U-Boot only supports < 4G of DDR\n");
                printf("       You could rebuild it with CONFIG_PHYS_64BIT\n");
                printf("       "); /* re-align to match init_func_ram print */
                total_memory = CONFIG_MAX_MEM_MAPPED;
        }
#endif

        return total_memory;
}

/*
 * fsl_ddr_sdram_size() - This function only returns the size of the total
 * memory without setting ddr control registers.
 */
phys_size_t
fsl_ddr_sdram_size(void)
{
        fsl_ddr_info_t  info;
        unsigned long long total_memory = 0;

        memset(&info, 0 , sizeof(fsl_ddr_info_t));

        /* Compute it once normally. */
        total_memory = fsl_ddr_compute(&info, STEP_GET_SPD, 1);

        return total_memory;
}