/*
 * arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c
 * This SPD SDRAM detection code supports AMCC PPC44x cpu's with a
 * DDR2 controller (non Denali Core). Those currently are:
 *
 * 405:         405EX(r)
 * 440/460:     440SP/440SPe/460EX/460GT
 *
 * Copyright (c) 2008 Nuovation System Designs, LLC
 *   Grant Erickson <gerickson@nuovations.com>

 * (C) Copyright 2007-2009
 * Stefan Roese, DENX Software Engineering, sr@denx.de.
 *
 * COPYRIGHT   AMCC   CORPORATION 2004
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

/* define DEBUG for debugging output (obviously ;-)) */
#if 0
#define DEBUG
#endif

#include <common.h>
#include <command.h>
#include <asm/ppc4xx.h>
#include <i2c.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/cache.h>

#include "ecc.h"

#define PPC4xx_IBM_DDR2_DUMP_REGISTER(mnemonic)                         \
        do {                                                            \
                u32 data;                                               \
                mfsdram(SDRAM_##mnemonic, data);                        \
                printf("%20s[%02x] = 0x%08X\n",                         \
                       "SDRAM_" #mnemonic, SDRAM_##mnemonic, data);     \
        } while (0)

#define PPC4xx_IBM_DDR2_DUMP_MQ_REGISTER(mnemonic)                      \
        do {                                                            \
                u32 data;                                               \
                data = mfdcr(SDRAM_##mnemonic);                         \
                printf("%20s[%02x] = 0x%08X\n",                         \
                       "SDRAM_" #mnemonic, SDRAM_##mnemonic, data);     \
        } while (0)

static void update_rdcc(void)
{
        u32 val;

        /*
         * Complete RDSS configuration as mentioned on page 7 of the AMCC
         * PowerPC440SP/SPe DDR2 application note:
         * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
         *
         * Or item #10 "10. Complete RDSS configuration" in chapter
         * "22.2.9 SDRAM Initialization" of AMCC PPC460EX/EXr/GT users
         * manual.
         */
        mfsdram(SDRAM_RTSR, val);
        if ((val & SDRAM_RTSR_TRK1SM_MASK) == SDRAM_RTSR_TRK1SM_ATPLS1) {
                mfsdram(SDRAM_RDCC, val);
                if ((val & SDRAM_RDCC_RDSS_MASK) != SDRAM_RDCC_RDSS_T4) {
                        val += 0x40000000;
                        mtsdram(SDRAM_RDCC, val);
                }
        }
}

#if defined(CONFIG_440)
/*
 * This DDR2 setup code can dynamically setup the TLB entries for the DDR2
 * memory region. Right now the cache should still be disabled in U-Boot
 * because of the EMAC driver, that need its buffer descriptor to be located
 * in non cached memory.
 *
 * If at some time this restriction doesn't apply anymore, just define
 * CONFIG_4xx_DCACHE in the board config file and this code should setup
 * everything correctly.
 */
#ifdef CONFIG_4xx_DCACHE
/* enable caching on SDRAM */
#define MY_TLB_WORD2_I_ENABLE           0
#else
/* disable caching on SDRAM */
#define MY_TLB_WORD2_I_ENABLE           TLB_WORD2_I_ENABLE
#endif /* CONFIG_4xx_DCACHE */

void dcbz_area(u32 start_address, u32 num_bytes);
#endif /* CONFIG_440 */

#define MAXRANKS        4
#define MAXBXCF         4

#define MULDIV64(m1, m2, d)     (u32)(((u64)(m1) * (u64)(m2)) / (u64)(d))

/*-----------------------------------------------------------------------------+
 * sdram_memsize
 *-----------------------------------------------------------------------------*/
phys_size_t sdram_memsize(void)
{
        phys_size_t mem_size;
        unsigned long mcopt2;
        unsigned long mcstat;
        unsigned long mb0cf;
        unsigned long sdsz;
        unsigned long i;

        mem_size = 0;

        mfsdram(SDRAM_MCOPT2, mcopt2);
        mfsdram(SDRAM_MCSTAT, mcstat);

        /* DDR controller must be enabled and not in self-refresh. */
        /* Otherwise memsize is zero. */
        if (((mcopt2 & SDRAM_MCOPT2_DCEN_MASK) == SDRAM_MCOPT2_DCEN_ENABLE)
            && ((mcopt2 & SDRAM_MCOPT2_SREN_MASK) == SDRAM_MCOPT2_SREN_EXIT)
            && ((mcstat & (SDRAM_MCSTAT_MIC_MASK | SDRAM_MCSTAT_SRMS_MASK))
                == (SDRAM_MCSTAT_MIC_COMP | SDRAM_MCSTAT_SRMS_NOT_SF))) {
                for (i = 0; i < MAXBXCF; i++) {
                        mfsdram(SDRAM_MB0CF + (i << 2), mb0cf);
                        /* Banks enabled */
                        if ((mb0cf & SDRAM_BXCF_M_BE_MASK) == SDRAM_BXCF_M_BE_ENABLE) {
#if defined(CONFIG_440)
                                sdsz = mfdcr_any(SDRAM_R0BAS + i) & SDRAM_RXBAS_SDSZ_MASK;
#else
                                sdsz = mb0cf & SDRAM_RXBAS_SDSZ_MASK;
#endif
                                switch(sdsz) {
                                case SDRAM_RXBAS_SDSZ_8:
                                        mem_size+=8;
                                        break;
                                case SDRAM_RXBAS_SDSZ_16:
                                        mem_size+=16;
                                        break;
                                case SDRAM_RXBAS_SDSZ_32:
                                        mem_size+=32;
                                        break;
                                case SDRAM_RXBAS_SDSZ_64:
                                        mem_size+=64;
                                        break;
                                case SDRAM_RXBAS_SDSZ_128:
                                        mem_size+=128;
                                        break;
                                case SDRAM_RXBAS_SDSZ_256:
                                        mem_size+=256;
                                        break;
                                case SDRAM_RXBAS_SDSZ_512:
                                        mem_size+=512;
                                        break;
                                case SDRAM_RXBAS_SDSZ_1024:
                                        mem_size+=1024;
                                        break;
                                case SDRAM_RXBAS_SDSZ_2048:
                                        mem_size+=2048;
                                        break;
                                case SDRAM_RXBAS_SDSZ_4096:
                                        mem_size+=4096;
                                        break;
                                default:
                                        printf("WARNING: Unsupported bank size (SDSZ=0x%lx)!\n"
                                               , sdsz);
                                        mem_size=0;
                                        break;
                                }
                        }
                }
        }

        return mem_size << 20;
}

/*-----------------------------------------------------------------------------+
 * is_ecc_enabled
 *-----------------------------------------------------------------------------*/
static unsigned long is_ecc_enabled(void)
{
        unsigned long val;

        mfsdram(SDRAM_MCOPT1, val);

        return SDRAM_MCOPT1_MCHK_CHK_DECODE(val);
}

/*-----------------------------------------------------------------------------+
 * board_add_ram_info
 *-----------------------------------------------------------------------------*/
void board_add_ram_info(int use_default)
{
        PPC4xx_SYS_INFO board_cfg;
        u32 val;

        if (is_ecc_enabled())
                puts(" (ECC");
        else
                puts(" (ECC not");

        get_sys_info(&board_cfg);

#if defined(CONFIG_405EX)
        val = board_cfg.freqPLB;
#else
        mfsdr(SDR0_DDR0, val);
        val = MULDIV64((board_cfg.freqPLB), SDR0_DDR0_DDRM_DECODE(val), 1);
#endif
        printf(" enabled, %d MHz", (val * 2) / 1000000);

        mfsdram(SDRAM_MMODE, val);
        val = (val & SDRAM_MMODE_DCL_MASK) >> 4;
        printf(", CL%d)", val);
}

#if defined(CONFIG_SPD_EEPROM)

/*-----------------------------------------------------------------------------+
 * Defines
 *-----------------------------------------------------------------------------*/
#define SDRAM_DDR1      1
#define SDRAM_DDR2      2
#define SDRAM_NONE      0

#define MAXDIMMS        2
#define MAX_SPD_BYTES   256   /* Max number of bytes on the DIMM's SPD EEPROM */

#define ONE_BILLION     1000000000

#define CMD_NOP         (7 << 19)
#define CMD_PRECHARGE   (2 << 19)
#define CMD_REFRESH     (1 << 19)
#define CMD_EMR         (0 << 19)
#define CMD_READ        (5 << 19)
#define CMD_WRITE       (4 << 19)

#define SELECT_MR       (0 << 16)
#define SELECT_EMR      (1 << 16)
#define SELECT_EMR2     (2 << 16)
#define SELECT_EMR3     (3 << 16)

/* MR */
#define DLL_RESET       0x00000100

#define WRITE_RECOV_2   (1 << 9)
#define WRITE_RECOV_3   (2 << 9)
#define WRITE_RECOV_4   (3 << 9)
#define WRITE_RECOV_5   (4 << 9)
#define WRITE_RECOV_6   (5 << 9)

#define BURST_LEN_4     0x00000002

/* EMR */
#define ODT_0_OHM       0x00000000
#define ODT_50_OHM      0x00000044
#define ODT_75_OHM      0x00000004
#define ODT_150_OHM     0x00000040

#define ODS_FULL        0x00000000
#define ODS_REDUCED     0x00000002
#define OCD_CALIB_DEF   0x00000380

/* defines for ODT (On Die Termination) of the 440SP(e) DDR2 controller */
#define ODT_EB0R        (0x80000000 >> 8)
#define ODT_EB0W        (0x80000000 >> 7)
#define CALC_ODT_R(n)   (ODT_EB0R << (n << 1))
#define CALC_ODT_W(n)   (ODT_EB0W << (n << 1))
#define CALC_ODT_RW(n)  (CALC_ODT_R(n) | CALC_ODT_W(n))

/* Defines for the Read Cycle Delay test */
#define NUMMEMTESTS     8
#define NUMMEMWORDS     8
#define NUMLOOPS        64              /* memory test loops */

/*
 * Newer PPC's like 440SPe, 460EX/GT can be equipped with more than 2GB of SDRAM.
 * To support such configurations, we "only" map the first 2GB via the TLB's. We
 * need some free virtual address space for the remaining peripherals like, SoC
 * devices, FLASH etc.
 *
 * Note that ECC is currently not supported on configurations with more than 2GB
 * SDRAM. This is because we only map the first 2GB on such systems, and therefore
 * the ECC parity byte of the remaining area can't be written.
 */

/*
 * Board-specific Platform code can reimplement spd_ddr_init_hang () if needed
 */
void __spd_ddr_init_hang (void)
{
        hang ();
}
void spd_ddr_init_hang (void) __attribute__((weak, alias("__spd_ddr_init_hang")));

/*
 * To provide an interface for board specific config values in this common
 * DDR setup code, we implement he "weak" default functions here. They return
 * the default value back to the caller.
 *
 * Please see include/configs/yucca.h for an example fora board specific
 * implementation.
 */
u32 __ddr_wrdtr(u32 default_val)
{
        return default_val;
}
u32 ddr_wrdtr(u32) __attribute__((weak, alias("__ddr_wrdtr")));

u32 __ddr_clktr(u32 default_val)
{
        return default_val;
}
u32 ddr_clktr(u32) __attribute__((weak, alias("__ddr_clktr")));


/* Private Structure Definitions */

/* enum only to ease code for cas latency setting */
typedef enum ddr_cas_id {
        DDR_CAS_2      = 20,
        DDR_CAS_2_5    = 25,
        DDR_CAS_3      = 30,
        DDR_CAS_4      = 40,
        DDR_CAS_5      = 50
} ddr_cas_id_t;

/*-----------------------------------------------------------------------------+
 * Prototypes
 *-----------------------------------------------------------------------------*/
static void get_spd_info(unsigned long *dimm_populated,
                         unsigned char *iic0_dimm_addr,
                         unsigned long num_dimm_banks);
static void check_mem_type(unsigned long *dimm_populated,
                           unsigned char *iic0_dimm_addr,
                           unsigned long num_dimm_banks);
static void check_frequency(unsigned long *dimm_populated,
                            unsigned char *iic0_dimm_addr,
                            unsigned long num_dimm_banks);
static void check_rank_number(unsigned long *dimm_populated,
                              unsigned char *iic0_dimm_addr,
                              unsigned long num_dimm_banks);
static void check_voltage_type(unsigned long *dimm_populated,
                               unsigned char *iic0_dimm_addr,
                               unsigned long num_dimm_banks);
static void program_memory_queue(unsigned long *dimm_populated,
                                 unsigned char *iic0_dimm_addr,
                                 unsigned long num_dimm_banks);
static void program_codt(unsigned long *dimm_populated,
                         unsigned char *iic0_dimm_addr,
                         unsigned long num_dimm_banks);
static void program_mode(unsigned long *dimm_populated,
                         unsigned char *iic0_dimm_addr,
                         unsigned long num_dimm_banks,
                         ddr_cas_id_t *selected_cas,
                         int *write_recovery);
static void program_tr(unsigned long *dimm_populated,
                       unsigned char *iic0_dimm_addr,
                       unsigned long num_dimm_banks);
static void program_rtr(unsigned long *dimm_populated,
                        unsigned char *iic0_dimm_addr,
                        unsigned long num_dimm_banks);
static void program_bxcf(unsigned long *dimm_populated,
                         unsigned char *iic0_dimm_addr,
                         unsigned long num_dimm_banks);
static void program_copt1(unsigned long *dimm_populated,
                          unsigned char *iic0_dimm_addr,
                          unsigned long num_dimm_banks);
static void program_initplr(unsigned long *dimm_populated,
                            unsigned char *iic0_dimm_addr,
                            unsigned long num_dimm_banks,
                            ddr_cas_id_t selected_cas,
                            int write_recovery);
#ifdef CONFIG_DDR_ECC
static void program_ecc(unsigned long *dimm_populated,
                        unsigned char *iic0_dimm_addr,
                        unsigned long num_dimm_banks,
                        unsigned long tlb_word2_i_value);
#endif
#if !defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
static void program_DQS_calibration(unsigned long *dimm_populated,
                                unsigned char *iic0_dimm_addr,
                                unsigned long num_dimm_banks);
#ifdef HARD_CODED_DQS /* calibration test with hardvalues */
static void     test(void);
#else
static void     DQS_calibration_process(void);
#endif
#endif

static unsigned char spd_read(uchar chip, uint addr)
{
        unsigned char data[2];

        if (i2c_probe(chip) == 0)
                if (i2c_read(chip, addr, 1, data, 1) == 0)
                        return data[0];

        return 0;
}

/*-----------------------------------------------------------------------------+
 * initdram.  Initializes the 440SP Memory Queue and DDR SDRAM controller.
 * Note: This routine runs from flash with a stack set up in the chip's
 * sram space.  It is important that the routine does not require .sbss, .bss or
 * .data sections.  It also cannot call routines that require these sections.
 *-----------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------
 * Function:     initdram
 * Description:  Configures SDRAM memory banks for DDR operation.
 *               Auto Memory Configuration option reads the DDR SDRAM EEPROMs
 *               via the IIC bus and then configures the DDR SDRAM memory
 *               banks appropriately. If Auto Memory Configuration is
 *               not used, it is assumed that no DIMM is plugged
 *-----------------------------------------------------------------------------*/
phys_size_t initdram(int board_type)
{
        unsigned char iic0_dimm_addr[] = SPD_EEPROM_ADDRESS;
        unsigned long dimm_populated[MAXDIMMS] = {SDRAM_NONE, SDRAM_NONE};
        unsigned long num_dimm_banks;           /* on board dimm banks */
        unsigned long val;
        ddr_cas_id_t selected_cas = DDR_CAS_5;  /* preset to silence compiler */
        int write_recovery;
        phys_size_t dram_size = 0;

        if (IS_ENABLED(CONFIG_SYS_RAMBOOT)) {
                /*
                 * Reduce RAM size to avoid overwriting memory used by
                 * current stack? Not sure what is happening.
                 */
                return sdram_memsize() / 2;
        }

        num_dimm_banks = sizeof(iic0_dimm_addr);

        /*------------------------------------------------------------------
         * Reset the DDR-SDRAM controller.
         *-----------------------------------------------------------------*/
        mtsdr(SDR0_SRST, SDR0_SRST0_DMC);
        mtsdr(SDR0_SRST, 0x00000000);

        /*
         * Make sure I2C controller is initialized
         * before continuing.
         */

        /* switch to correct I2C bus */
        i2c_set_bus_num(CONFIG_SYS_SPD_BUS_NUM);

        /*------------------------------------------------------------------
         * Clear out the serial presence detect buffers.
         * Perform IIC reads from the dimm.  Fill in the spds.
         * Check to see if the dimm slots are populated
         *-----------------------------------------------------------------*/
        get_spd_info(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Check the memory type for the dimms plugged.
         *-----------------------------------------------------------------*/
        check_mem_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Check the frequency supported for the dimms plugged.
         *-----------------------------------------------------------------*/
        check_frequency(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Check the total rank number.
         *-----------------------------------------------------------------*/
        check_rank_number(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Check the voltage type for the dimms plugged.
         *-----------------------------------------------------------------*/
        check_voltage_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Program SDRAM controller options 2 register
         * Except Enabling of the memory controller.
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_MCOPT2, val);
        mtsdram(SDRAM_MCOPT2,
                (val &
                 ~(SDRAM_MCOPT2_SREN_MASK | SDRAM_MCOPT2_PMEN_MASK |
                   SDRAM_MCOPT2_IPTR_MASK | SDRAM_MCOPT2_XSRP_MASK |
                   SDRAM_MCOPT2_ISIE_MASK))
                | (SDRAM_MCOPT2_SREN_ENTER | SDRAM_MCOPT2_PMEN_DISABLE |
                   SDRAM_MCOPT2_IPTR_IDLE | SDRAM_MCOPT2_XSRP_ALLOW |
                   SDRAM_MCOPT2_ISIE_ENABLE));

        /*------------------------------------------------------------------
         * Program SDRAM controller options 1 register
         * Note: Does not enable the memory controller.
         *-----------------------------------------------------------------*/
        program_copt1(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Set the SDRAM Controller On Die Termination Register
         *-----------------------------------------------------------------*/
        program_codt(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Program SDRAM refresh register.
         *-----------------------------------------------------------------*/
        program_rtr(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Program SDRAM mode register.
         *-----------------------------------------------------------------*/
        program_mode(dimm_populated, iic0_dimm_addr, num_dimm_banks,
                     &selected_cas, &write_recovery);

        /*------------------------------------------------------------------
         * Set the SDRAM Write Data/DM/DQS Clock Timing Reg
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_WRDTR, val);
        mtsdram(SDRAM_WRDTR, (val & ~(SDRAM_WRDTR_LLWP_MASK | SDRAM_WRDTR_WTR_MASK)) |
                ddr_wrdtr(SDRAM_WRDTR_LLWP_1_CYC | SDRAM_WRDTR_WTR_90_DEG_ADV));

        /*------------------------------------------------------------------
         * Set the SDRAM Clock Timing Register
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_CLKTR, val);
        mtsdram(SDRAM_CLKTR, (val & ~SDRAM_CLKTR_CLKP_MASK) |
                ddr_clktr(SDRAM_CLKTR_CLKP_0_DEG));

        /*------------------------------------------------------------------
         * Program the BxCF registers.
         *-----------------------------------------------------------------*/
        program_bxcf(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Program SDRAM timing registers.
         *-----------------------------------------------------------------*/
        program_tr(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Set the Extended Mode register
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_MEMODE, val);
        mtsdram(SDRAM_MEMODE,
                (val & ~(SDRAM_MEMODE_DIC_MASK  | SDRAM_MEMODE_DLL_MASK |
                         SDRAM_MEMODE_RTT_MASK | SDRAM_MEMODE_DQS_MASK)) |
                (SDRAM_MEMODE_DIC_NORMAL | SDRAM_MEMODE_DLL_ENABLE
                 | SDRAM_MEMODE_RTT_150OHM | SDRAM_MEMODE_DQS_ENABLE));

        /*------------------------------------------------------------------
         * Program Initialization preload registers.
         *-----------------------------------------------------------------*/
        program_initplr(dimm_populated, iic0_dimm_addr, num_dimm_banks,
                        selected_cas, write_recovery);

        /*------------------------------------------------------------------
         * Delay to ensure 200usec have elapsed since reset.
         *-----------------------------------------------------------------*/
        udelay(400);

        /*------------------------------------------------------------------
         * Set the memory queue core base addr.
         *-----------------------------------------------------------------*/
        program_memory_queue(dimm_populated, iic0_dimm_addr, num_dimm_banks);

        /*------------------------------------------------------------------
         * Program SDRAM controller options 2 register
         * Enable the memory controller.
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_MCOPT2, val);
        mtsdram(SDRAM_MCOPT2,
                (val & ~(SDRAM_MCOPT2_SREN_MASK | SDRAM_MCOPT2_DCEN_MASK |
                         SDRAM_MCOPT2_IPTR_MASK | SDRAM_MCOPT2_ISIE_MASK)) |
                         SDRAM_MCOPT2_IPTR_EXECUTE);

        /*------------------------------------------------------------------
         * Wait for IPTR_EXECUTE init sequence to complete.
         *-----------------------------------------------------------------*/
        do {
                mfsdram(SDRAM_MCSTAT, val);
        } while ((val & SDRAM_MCSTAT_MIC_MASK) == SDRAM_MCSTAT_MIC_NOTCOMP);

        /* enable the controller only after init sequence completes */
        mfsdram(SDRAM_MCOPT2, val);
        mtsdram(SDRAM_MCOPT2, (val | SDRAM_MCOPT2_DCEN_ENABLE));

        /* Make sure delay-line calibration is done before proceeding */
        do {
                mfsdram(SDRAM_DLCR, val);
        } while (!(val & SDRAM_DLCR_DLCS_COMPLETE));

        /* get installed memory size */
        dram_size = sdram_memsize();

        /*
         * Limit size to 2GB
         */
        if (dram_size > CONFIG_MAX_MEM_MAPPED)
                dram_size = CONFIG_MAX_MEM_MAPPED;

        /* and program tlb entries for this size (dynamic) */

        /*
         * Program TLB entries with caches enabled, for best performace
         * while auto-calibrating and ECC generation
         */
        program_tlb(0, 0, dram_size, 0);

        /*------------------------------------------------------------------
         * DQS calibration.
         *-----------------------------------------------------------------*/
#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
        DQS_autocalibration();
#else
        program_DQS_calibration(dimm_populated, iic0_dimm_addr, num_dimm_banks);
#endif
        /*
         * Now complete RDSS configuration as mentioned on page 7 of the AMCC
         * PowerPC440SP/SPe DDR2 application note:
         * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
         */
        update_rdcc();

#ifdef CONFIG_DDR_ECC
        /*------------------------------------------------------------------
         * If ecc is enabled, initialize the parity bits.
         *-----------------------------------------------------------------*/
        program_ecc(dimm_populated, iic0_dimm_addr, num_dimm_banks, 0);
#endif

        /*
         * Flush the dcache before removing the TLB with caches
         * enabled. Otherwise this might lead to problems later on,
         * e.g. while booting Linux (as seen on ICON-440SPe).
         */
        flush_dcache();

        /*
         * Now after initialization (auto-calibration and ECC generation)
         * remove the TLB entries with caches enabled and program again with
         * desired cache functionality
         */
        remove_tlb(0, dram_size);
        program_tlb(0, 0, dram_size, MY_TLB_WORD2_I_ENABLE);

        ppc4xx_ibm_ddr2_register_dump();

        /*
         * Clear potential errors resulting from auto-calibration.
         * If not done, then we could get an interrupt later on when
         * exceptions are enabled.
         */
        set_mcsr(get_mcsr());

        return sdram_memsize();
}

static void get_spd_info(unsigned long *dimm_populated,
                         unsigned char *iic0_dimm_addr,
                         unsigned long num_dimm_banks)
{
        unsigned long dimm_num;
        unsigned long dimm_found;
        unsigned char num_of_bytes;
        unsigned char total_size;

        dimm_found = false;
        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                num_of_bytes = 0;
                total_size = 0;

                num_of_bytes = spd_read(iic0_dimm_addr[dimm_num], 0);
                debug("\nspd_read(0x%x) returned %d\n",
                      iic0_dimm_addr[dimm_num], num_of_bytes);
                total_size = spd_read(iic0_dimm_addr[dimm_num], 1);
                debug("spd_read(0x%x) returned %d\n",
                      iic0_dimm_addr[dimm_num], total_size);

                if ((num_of_bytes != 0) && (total_size != 0)) {
                        dimm_populated[dimm_num] = true;
                        dimm_found = true;
                        debug("DIMM slot %lu: populated\n", dimm_num);
                } else {
                        dimm_populated[dimm_num] = false;
                        debug("DIMM slot %lu: Not populated\n", dimm_num);
                }
        }

        if (dimm_found == false) {
                printf("ERROR - No memory installed. Install a DDR-SDRAM DIMM.\n\n");
                spd_ddr_init_hang ();
        }
}


/*------------------------------------------------------------------
 * For the memory DIMMs installed, this routine verifies that they
 * really are DDR specific DIMMs.
 *-----------------------------------------------------------------*/
static void check_mem_type(unsigned long *dimm_populated,
                           unsigned char *iic0_dimm_addr,
                           unsigned long num_dimm_banks)
{
        unsigned long dimm_num;
        unsigned long dimm_type;

        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                if (dimm_populated[dimm_num] == true) {
                        dimm_type = spd_read(iic0_dimm_addr[dimm_num], 2);
                        switch (dimm_type) {
                        case 1:
                                printf("ERROR: Standard Fast Page Mode DRAM DIMM detected in "
                                       "slot %d.\n", (unsigned int)dimm_num);
                                printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                                break;
                        case 2:
                                printf("ERROR: EDO DIMM detected in slot %d.\n",
                                       (unsigned int)dimm_num);
                                printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                                break;
                        case 3:
                                printf("ERROR: Pipelined Nibble DIMM detected in slot %d.\n",
                                       (unsigned int)dimm_num);
                                printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                                break;
                        case 4:
                                printf("ERROR: SDRAM DIMM detected in slot %d.\n",
                                       (unsigned int)dimm_num);
                                printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                                break;
                        case 5:
                                printf("ERROR: Multiplexed ROM DIMM detected in slot %d.\n",
                                       (unsigned int)dimm_num);
                                printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                                break;
                        case 6:
                                printf("ERROR: SGRAM DIMM detected in slot %d.\n",
                                       (unsigned int)dimm_num);
                                printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                                break;
                        case 7:
                                debug("DIMM slot %lu: DDR1 SDRAM detected\n", dimm_num);
                                dimm_populated[dimm_num] = SDRAM_DDR1;
                                break;
                        case 8:
                                debug("DIMM slot %lu: DDR2 SDRAM detected\n", dimm_num);
                                dimm_populated[dimm_num] = SDRAM_DDR2;
                                break;
                        default:
                                printf("ERROR: Unknown DIMM detected in slot %d.\n",
                                       (unsigned int)dimm_num);
                                printf("Only DDR1 and DDR2 SDRAM DIMMs are supported.\n");
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                                break;
                        }
                }
        }
        for (dimm_num = 1; dimm_num < num_dimm_banks; dimm_num++) {
                if ((dimm_populated[dimm_num-1] != SDRAM_NONE)
                    && (dimm_populated[dimm_num]   != SDRAM_NONE)
                    && (dimm_populated[dimm_num-1] != dimm_populated[dimm_num])) {
                        printf("ERROR: DIMM's DDR1 and DDR2 type can not be mixed.\n");
                        spd_ddr_init_hang ();
                }
        }
}

/*------------------------------------------------------------------
 * For the memory DIMMs installed, this routine verifies that
 * frequency previously calculated is supported.
 *-----------------------------------------------------------------*/
static void check_frequency(unsigned long *dimm_populated,
                            unsigned char *iic0_dimm_addr,
                            unsigned long num_dimm_banks)
{
        unsigned long dimm_num;
        unsigned long tcyc_reg;
        unsigned long cycle_time;
        unsigned long calc_cycle_time;
        unsigned long sdram_freq;
        unsigned long sdr_ddrpll;
        PPC4xx_SYS_INFO board_cfg;

        /*------------------------------------------------------------------
         * Get the board configuration info.
         *-----------------------------------------------------------------*/
        get_sys_info(&board_cfg);

        mfsdr(SDR0_DDR0, sdr_ddrpll);
        sdram_freq = ((board_cfg.freqPLB) * SDR0_DDR0_DDRM_DECODE(sdr_ddrpll));

        /*
         * calc_cycle_time is calculated from DDR frequency set by board/chip
         * and is expressed in multiple of 10 picoseconds
         * to match the way DIMM cycle time is calculated below.
         */
        calc_cycle_time = MULDIV64(ONE_BILLION, 100, sdram_freq);

        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                if (dimm_populated[dimm_num] != SDRAM_NONE) {
                        tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 9);
                        /*
                         * Byte 9, Cycle time for CAS Latency=X, is split into two nibbles:
                         * the higher order nibble (bits 4-7) designates the cycle time
                         * to a granularity of 1ns;
                         * the value presented by the lower order nibble (bits 0-3)
                         * has a granularity of .1ns and is added to the value designated
                         * by the higher nibble. In addition, four lines of the lower order
                         * nibble are assigned to support +.25,+.33, +.66 and +.75.
                         */
                         /* Convert from hex to decimal */
                        if ((tcyc_reg & 0x0F) == 0x0D)
                                cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) + 75;
                        else if ((tcyc_reg & 0x0F) == 0x0C)
                                cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) + 66;
                        else if ((tcyc_reg & 0x0F) == 0x0B)
                                cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) + 33;
                        else if ((tcyc_reg & 0x0F) == 0x0A)
                                cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) + 25;
                        else
                                cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) +
                                        ((tcyc_reg & 0x0F)*10);
                        debug("cycle_time=%lu [10 picoseconds]\n", cycle_time);

                        if  (cycle_time > (calc_cycle_time + 10)) {
                                /*
                                 * the provided sdram cycle_time is too small
                                 * for the available DIMM cycle_time.
                                 * The additionnal 100ps is here to accept a small incertainty.
                                 */
                                printf("ERROR: DRAM DIMM detected with cycle_time %d ps in "
                                       "slot %d \n while calculated cycle time is %d ps.\n",
                                       (unsigned int)(cycle_time*10),
                                       (unsigned int)dimm_num,
                                       (unsigned int)(calc_cycle_time*10));
                                printf("Replace the DIMM, or change DDR frequency via "
                                       "strapping bits.\n\n");
                                spd_ddr_init_hang ();
                        }
                }
        }
}

/*------------------------------------------------------------------
 * For the memory DIMMs installed, this routine verifies two
 * ranks/banks maximum are availables.
 *-----------------------------------------------------------------*/
static void check_rank_number(unsigned long *dimm_populated,
                              unsigned char *iic0_dimm_addr,
                              unsigned long num_dimm_banks)
{
        unsigned long dimm_num;
        unsigned long dimm_rank;
        unsigned long total_rank = 0;

        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                if (dimm_populated[dimm_num] != SDRAM_NONE) {
                        dimm_rank = spd_read(iic0_dimm_addr[dimm_num], 5);
                        if (((unsigned long)spd_read(iic0_dimm_addr[dimm_num], 2)) == 0x08)
                                dimm_rank = (dimm_rank & 0x0F) +1;
                        else
                                dimm_rank = dimm_rank & 0x0F;


                        if (dimm_rank > MAXRANKS) {
                                printf("ERROR: DRAM DIMM detected with %lu ranks in "
                                       "slot %lu is not supported.\n", dimm_rank, dimm_num);
                                printf("Only %d ranks are supported for all DIMM.\n", MAXRANKS);
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                        } else
                                total_rank += dimm_rank;
                }
                if (total_rank > MAXRANKS) {
                        printf("ERROR: DRAM DIMM detected with a total of %d ranks "
                               "for all slots.\n", (unsigned int)total_rank);
                        printf("Only %d ranks are supported for all DIMM.\n", MAXRANKS);
                        printf("Remove one of the DIMM modules.\n\n");
                        spd_ddr_init_hang ();
                }
        }
}

/*------------------------------------------------------------------
 * only support 2.5V modules.
 * This routine verifies this.
 *-----------------------------------------------------------------*/
static void check_voltage_type(unsigned long *dimm_populated,
                               unsigned char *iic0_dimm_addr,
                               unsigned long num_dimm_banks)
{
        unsigned long dimm_num;
        unsigned long voltage_type;

        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                if (dimm_populated[dimm_num] != SDRAM_NONE) {
                        voltage_type = spd_read(iic0_dimm_addr[dimm_num], 8);
                        switch (voltage_type) {
                        case 0x00:
                                printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
                                printf("This DIMM is 5.0 Volt/TTL.\n");
                                printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
                                       (unsigned int)dimm_num);
                                spd_ddr_init_hang ();
                                break;
                        case 0x01:
                                printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
                                printf("This DIMM is LVTTL.\n");
                                printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
                                       (unsigned int)dimm_num);
                                spd_ddr_init_hang ();
                                break;
                        case 0x02:
                                printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
                                printf("This DIMM is 1.5 Volt.\n");
                                printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
                                       (unsigned int)dimm_num);
                                spd_ddr_init_hang ();
                                break;
                        case 0x03:
                                printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
                                printf("This DIMM is 3.3 Volt/TTL.\n");
                                printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
                                       (unsigned int)dimm_num);
                                spd_ddr_init_hang ();
                                break;
                        case 0x04:
                                /* 2.5 Voltage only for DDR1 */
                                break;
                        case 0x05:
                                /* 1.8 Voltage only for DDR2 */
                                break;
                        default:
                                printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
                                printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
                                       (unsigned int)dimm_num);
                                spd_ddr_init_hang ();
                                break;
                        }
                }
        }
}

/*-----------------------------------------------------------------------------+
 * program_copt1.
 *-----------------------------------------------------------------------------*/
static void program_copt1(unsigned long *dimm_populated,
                          unsigned char *iic0_dimm_addr,
                          unsigned long num_dimm_banks)
{
        unsigned long dimm_num;
        unsigned long mcopt1;
        unsigned long ecc_enabled;
        unsigned long ecc = 0;
        unsigned long data_width = 0;
        unsigned long dimm_32bit;
        unsigned long dimm_64bit;
        unsigned long registered = 0;
        unsigned long attribute = 0;
        unsigned long buf0, buf1; /* TODO: code to be changed for IOP1.6 to support 4 DIMMs */
        unsigned long bankcount;
        unsigned long val;

#ifdef CONFIG_DDR_ECC
        ecc_enabled = true;
#else
        ecc_enabled = false;
#endif
        dimm_32bit = false;
        dimm_64bit = false;
        buf0 = false;
        buf1 = false;

        /*------------------------------------------------------------------
         * Set memory controller options reg 1, SDRAM_MCOPT1.
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_MCOPT1, val);
        mcopt1 = val & ~(SDRAM_MCOPT1_MCHK_MASK | SDRAM_MCOPT1_RDEN_MASK |
                         SDRAM_MCOPT1_PMU_MASK  | SDRAM_MCOPT1_DMWD_MASK |
                         SDRAM_MCOPT1_UIOS_MASK | SDRAM_MCOPT1_BCNT_MASK |
                         SDRAM_MCOPT1_DDR_TYPE_MASK | SDRAM_MCOPT1_RWOO_MASK |
                         SDRAM_MCOPT1_WOOO_MASK | SDRAM_MCOPT1_DCOO_MASK |
                         SDRAM_MCOPT1_DREF_MASK);

        mcopt1 |= SDRAM_MCOPT1_QDEP;
        mcopt1 |= SDRAM_MCOPT1_PMU_OPEN;
        mcopt1 |= SDRAM_MCOPT1_RWOO_DISABLED;
        mcopt1 |= SDRAM_MCOPT1_WOOO_DISABLED;
        mcopt1 |= SDRAM_MCOPT1_DCOO_DISABLED;

        mcopt1 |= SDRAM_MCOPT1_DREF_NORMAL;

        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                if (dimm_populated[dimm_num] != SDRAM_NONE) {
                        /* test ecc support */
                        ecc = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 11);
                        if (ecc != 0x02) /* ecc not supported */
                                ecc_enabled = false;

                        /* test bank count */
                        bankcount = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 17);
                        if (bankcount == 0x04) /* bank count = 4 */
                                mcopt1 |= SDRAM_MCOPT1_4_BANKS;
                        else /* bank count = 8 */
                                mcopt1 |= SDRAM_MCOPT1_8_BANKS;

                        /* test for buffered/unbuffered, registered, differential clocks */
                        registered = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 20);
                        attribute = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 21);

                        /* TODO: code to be changed for IOP1.6 to support 4 DIMMs */
                        if (dimm_num == 0) {
                                if (dimm_populated[dimm_num] == SDRAM_DDR1) /* DDR1 type */
                                        mcopt1 |= SDRAM_MCOPT1_DDR1_TYPE;
                                if (dimm_populated[dimm_num] == SDRAM_DDR2) /* DDR2 type */
                                        mcopt1 |= SDRAM_MCOPT1_DDR2_TYPE;
                                if (registered == 1) { /* DDR2 always buffered */
                                        /* TODO: what about above  comments ? */
                                        mcopt1 |= SDRAM_MCOPT1_RDEN;
                                        buf0 = true;
                                } else {
                                        /* TODO: the mask 0x02 doesn't match Samsung def for byte 21. */
                                        if ((attribute & 0x02) == 0x00) {
                                                /* buffered not supported */
                                                buf0 = false;
                                        } else {
                                                mcopt1 |= SDRAM_MCOPT1_RDEN;
                                                buf0 = true;
                                        }
                                }
                        }
                        else if (dimm_num == 1) {
                                if (dimm_populated[dimm_num] == SDRAM_DDR1) /* DDR1 type */
                                        mcopt1 |= SDRAM_MCOPT1_DDR1_TYPE;
                                if (dimm_populated[dimm_num] == SDRAM_DDR2) /* DDR2 type */
                                        mcopt1 |= SDRAM_MCOPT1_DDR2_TYPE;
                                if (registered == 1) {
                                        /* DDR2 always buffered */
                                        mcopt1 |= SDRAM_MCOPT1_RDEN;
                                        buf1 = true;
                                } else {
                                        if ((attribute & 0x02) == 0x00) {
                                                /* buffered not supported */
                                                buf1 = false;
                                        } else {
                                                mcopt1 |= SDRAM_MCOPT1_RDEN;
                                                buf1 = true;
                                        }
                                }
                        }

                        /* Note that for DDR2 the byte 7 is reserved, but OK to keep code as is. */
                        data_width = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 6) +
                                (((unsigned long)spd_read(iic0_dimm_addr[dimm_num], 7)) << 8);

                        switch (data_width) {
                        case 72:
                        case 64:
                                dimm_64bit = true;
                                break;
                        case 40:
                        case 32:
                                dimm_32bit = true;
                                break;
                        default:
                                printf("WARNING: Detected a DIMM with a data width of %lu bits.\n",
                                       data_width);
                                printf("Only DIMMs with 32 or 64 bit DDR-SDRAM widths are supported.\n");
                                break;
                        }
                }
        }

        /* verify matching properties */
        if ((dimm_populated[0] != SDRAM_NONE) && (dimm_populated[1] != SDRAM_NONE)) {
                if (buf0 != buf1) {
                        printf("ERROR: DIMM's buffered/unbuffered, registered, clocking don't match.\n");
                        spd_ddr_init_hang ();
                }
        }

        if ((dimm_64bit == true) && (dimm_32bit == true)) {
                printf("ERROR: Cannot mix 32 bit and 64 bit DDR-SDRAM DIMMs together.\n");
                spd_ddr_init_hang ();
        } else if ((dimm_64bit == true) && (dimm_32bit == false)) {
                mcopt1 |= SDRAM_MCOPT1_DMWD_64;
        } else if ((dimm_64bit == false) && (dimm_32bit == true)) {
                mcopt1 |= SDRAM_MCOPT1_DMWD_32;
        } else {
                printf("ERROR: Please install only 32 or 64 bit DDR-SDRAM DIMMs.\n\n");
                spd_ddr_init_hang ();
        }

        if (ecc_enabled == true)
                mcopt1 |= SDRAM_MCOPT1_MCHK_GEN;
        else
                mcopt1 |= SDRAM_MCOPT1_MCHK_NON;

        mtsdram(SDRAM_MCOPT1, mcopt1);
}

/*-----------------------------------------------------------------------------+
 * program_codt.
 *-----------------------------------------------------------------------------*/
static void program_codt(unsigned long *dimm_populated,
                         unsigned char *iic0_dimm_addr,
                         unsigned long num_dimm_banks)
{
        unsigned long codt;
        unsigned long modt0 = 0;
        unsigned long modt1 = 0;
        unsigned long modt2 = 0;
        unsigned long modt3 = 0;
        unsigned char dimm_num;
        unsigned char dimm_rank;
        unsigned char total_rank = 0;
        unsigned char total_dimm = 0;
        unsigned char dimm_type = 0;
        unsigned char firstSlot = 0;

        /*------------------------------------------------------------------
         * Set the SDRAM Controller On Die Termination Register
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_CODT, codt);
        codt &= ~(SDRAM_CODT_DQS_SINGLE_END | SDRAM_CODT_CKSE_SINGLE_END);
        codt |= SDRAM_CODT_IO_NMODE;

        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                if (dimm_populated[dimm_num] != SDRAM_NONE) {
                        dimm_rank = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 5);
                        if (((unsigned long)spd_read(iic0_dimm_addr[dimm_num], 2)) == 0x08) {
                                dimm_rank = (dimm_rank & 0x0F) + 1;
                                dimm_type = SDRAM_DDR2;
                        } else {
                                dimm_rank = dimm_rank & 0x0F;
                                dimm_type = SDRAM_DDR1;
                        }

                        total_rank += dimm_rank;
                        total_dimm++;
                        if ((dimm_num == 0) && (total_dimm == 1))
                                firstSlot = true;
                        else
                                firstSlot = false;
                }
        }
        if (dimm_type == SDRAM_DDR2) {
                codt |= SDRAM_CODT_DQS_1_8_V_DDR2;
                if ((total_dimm == 1) && (firstSlot == true)) {
                        if (total_rank == 1) {  /* PUUU */
                                codt |= CALC_ODT_R(0);
                                modt0 = CALC_ODT_W(0);
                                modt1 = 0x00000000;
                                modt2 = 0x00000000;
                                modt3 = 0x00000000;
                        }
                        if (total_rank == 2) {  /* PPUU */
                                codt |= CALC_ODT_R(0) | CALC_ODT_R(1);
                                modt0 = CALC_ODT_W(0) | CALC_ODT_W(1);
                                modt1 = 0x00000000;
                                modt2 = 0x00000000;
                                modt3 = 0x00000000;
                        }
                } else if ((total_dimm == 1) && (firstSlot != true)) {
                        if (total_rank == 1) {  /* UUPU */
                                codt |= CALC_ODT_R(2);
                                modt0 = 0x00000000;
                                modt1 = 0x00000000;
                                modt2 = CALC_ODT_W(2);
                                modt3 = 0x00000000;
                        }
                        if (total_rank == 2) {  /* UUPP */
                                codt |= CALC_ODT_R(2) | CALC_ODT_R(3);
                                modt0 = 0x00000000;
                                modt1 = 0x00000000;
                                modt2 = CALC_ODT_W(2) | CALC_ODT_W(3);
                                modt3 = 0x00000000;
                        }
                }
                if (total_dimm == 2) {
                        if (total_rank == 2) {  /* PUPU */
                                codt |= CALC_ODT_R(0) | CALC_ODT_R(2);
                                modt0 = CALC_ODT_RW(2);
                                modt1 = 0x00000000;
                                modt2 = CALC_ODT_RW(0);
                                modt3 = 0x00000000;
                        }
                        if (total_rank == 4) {  /* PPPP */
                                codt |= CALC_ODT_R(0) | CALC_ODT_R(1) |
                                        CALC_ODT_R(2) | CALC_ODT_R(3);
                                modt0 = CALC_ODT_RW(2) | CALC_ODT_RW(3);
                                modt1 = 0x00000000;
                                modt2 = CALC_ODT_RW(0) | CALC_ODT_RW(1);
                                modt3 = 0x00000000;
                        }
                }
        } else {
                codt |= SDRAM_CODT_DQS_2_5_V_DDR1;
                modt0 = 0x00000000;
                modt1 = 0x00000000;
                modt2 = 0x00000000;
                modt3 = 0x00000000;

                if (total_dimm == 1) {
                        if (total_rank == 1)
                                codt |= 0x00800000;
                        if (total_rank == 2)
                                codt |= 0x02800000;
                }
                if (total_dimm == 2) {
                        if (total_rank == 2)
                                codt |= 0x08800000;
                        if (total_rank == 4)
                                codt |= 0x2a800000;
                }
        }

        debug("nb of dimm %d\n", total_dimm);
        debug("nb of rank %d\n", total_rank);
        if (total_dimm == 1)
                debug("dimm in slot %d\n", firstSlot);

        mtsdram(SDRAM_CODT, codt);
        mtsdram(SDRAM_MODT0, modt0);
        mtsdram(SDRAM_MODT1, modt1);
        mtsdram(SDRAM_MODT2, modt2);
        mtsdram(SDRAM_MODT3, modt3);
}

/*-----------------------------------------------------------------------------+
 * program_initplr.
 *-----------------------------------------------------------------------------*/
static void program_initplr(unsigned long *dimm_populated,
                            unsigned char *iic0_dimm_addr,
                            unsigned long num_dimm_banks,
                            ddr_cas_id_t selected_cas,
                            int write_recovery)
{
        u32 cas = 0;
        u32 odt = 0;
        u32 ods = 0;
        u32 mr;
        u32 wr;
        u32 emr;
        u32 emr2;
        u32 emr3;
        int dimm_num;
        int total_dimm = 0;

        /******************************************************
         ** Assumption: if more than one DIMM, all DIMMs are the same
         **             as already checked in check_memory_type
         ******************************************************/

        if ((dimm_populated[0] == SDRAM_DDR1) || (dimm_populated[1] == SDRAM_DDR1)) {
                mtsdram(SDRAM_INITPLR0, 0x81B80000);
                mtsdram(SDRAM_INITPLR1, 0x81900400);
                mtsdram(SDRAM_INITPLR2, 0x81810000);
                mtsdram(SDRAM_INITPLR3, 0xff800162);
                mtsdram(SDRAM_INITPLR4, 0x81900400);
                mtsdram(SDRAM_INITPLR5, 0x86080000);
                mtsdram(SDRAM_INITPLR6, 0x86080000);
                mtsdram(SDRAM_INITPLR7, 0x81000062);
        } else if ((dimm_populated[0] == SDRAM_DDR2) || (dimm_populated[1] == SDRAM_DDR2)) {
                switch (selected_cas) {
                case DDR_CAS_3:
                        cas = 3 << 4;
                        break;
                case DDR_CAS_4:
                        cas = 4 << 4;
                        break;
                case DDR_CAS_5:
                        cas = 5 << 4;
                        break;
                default:
                        printf("ERROR: ucode error on selected_cas value %d", selected_cas);
                        spd_ddr_init_hang ();
                        break;
                }

#if 0
                /*
                 * ToDo - Still a problem with the write recovery:
                 * On the Corsair CM2X512-5400C4 module, setting write recovery
                 * in the INITPLR reg to the value calculated in program_mode()
                 * results in not correctly working DDR2 memory (crash after
                 * relocation).
                 *
                 * So for now, set the write recovery to 3. This seems to work
                 * on the Corair module too.
                 *
                 * 2007-03-01, sr
                 */
                switch (write_recovery) {
                case 3:
                        wr = WRITE_RECOV_3;
                        break;
                case 4:
                        wr = WRITE_RECOV_4;
                        break;
                case 5:
                        wr = WRITE_RECOV_5;
                        break;
                case 6:
                        wr = WRITE_RECOV_6;
                        break;
                default:
                        printf("ERROR: write recovery not support (%d)", write_recovery);
                        spd_ddr_init_hang ();
                        break;
                }
#else
                wr = WRITE_RECOV_3; /* test-only, see description above */
#endif

                for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++)
                        if (dimm_populated[dimm_num] != SDRAM_NONE)
                                total_dimm++;
                if (total_dimm == 1) {
                        odt = ODT_150_OHM;
                        ods = ODS_FULL;
                } else if (total_dimm == 2) {
                        odt = ODT_75_OHM;
                        ods = ODS_REDUCED;
                } else {
                        printf("ERROR: Unsupported number of DIMM's (%d)", total_dimm);
                        spd_ddr_init_hang ();
                }

                mr = CMD_EMR | SELECT_MR | BURST_LEN_4 | wr | cas;
                emr = CMD_EMR | SELECT_EMR | odt | ods;
                emr2 = CMD_EMR | SELECT_EMR2;
                emr3 = CMD_EMR | SELECT_EMR3;
                /* NOP - Wait 106 MemClk cycles */
                mtsdram(SDRAM_INITPLR0, SDRAM_INITPLR_ENABLE | CMD_NOP |
                                        SDRAM_INITPLR_IMWT_ENCODE(106));
                udelay(1000);
                /* precharge 4 MemClk cycles */
                mtsdram(SDRAM_INITPLR1, SDRAM_INITPLR_ENABLE | CMD_PRECHARGE |
                                        SDRAM_INITPLR_IMWT_ENCODE(4));
                /* EMR2 - Wait tMRD (2 MemClk cycles) */
                mtsdram(SDRAM_INITPLR2, SDRAM_INITPLR_ENABLE | emr2 |
                                        SDRAM_INITPLR_IMWT_ENCODE(2));
                /* EMR3 - Wait tMRD (2 MemClk cycles) */
                mtsdram(SDRAM_INITPLR3, SDRAM_INITPLR_ENABLE | emr3 |
                                        SDRAM_INITPLR_IMWT_ENCODE(2));
                /* EMR DLL ENABLE - Wait tMRD (2 MemClk cycles) */
                mtsdram(SDRAM_INITPLR4, SDRAM_INITPLR_ENABLE | emr |
                                        SDRAM_INITPLR_IMWT_ENCODE(2));
                /* MR w/ DLL reset - 200 cycle wait for DLL reset */
                mtsdram(SDRAM_INITPLR5, SDRAM_INITPLR_ENABLE | mr | DLL_RESET |
                                        SDRAM_INITPLR_IMWT_ENCODE(200));
                udelay(1000);
                /* precharge 4 MemClk cycles */
                mtsdram(SDRAM_INITPLR6, SDRAM_INITPLR_ENABLE | CMD_PRECHARGE |
                                        SDRAM_INITPLR_IMWT_ENCODE(4));
                /* Refresh 25 MemClk cycles */
                mtsdram(SDRAM_INITPLR7, SDRAM_INITPLR_ENABLE | CMD_REFRESH |
                                        SDRAM_INITPLR_IMWT_ENCODE(25));
                /* Refresh 25 MemClk cycles */
                mtsdram(SDRAM_INITPLR8, SDRAM_INITPLR_ENABLE | CMD_REFRESH |
                                        SDRAM_INITPLR_IMWT_ENCODE(25));
                /* Refresh 25 MemClk cycles */
                mtsdram(SDRAM_INITPLR9, SDRAM_INITPLR_ENABLE | CMD_REFRESH |
                                        SDRAM_INITPLR_IMWT_ENCODE(25));
                /* Refresh 25 MemClk cycles */
                mtsdram(SDRAM_INITPLR10, SDRAM_INITPLR_ENABLE | CMD_REFRESH |
                                         SDRAM_INITPLR_IMWT_ENCODE(25));
                /* MR w/o DLL reset - Wait tMRD (2 MemClk cycles) */
                mtsdram(SDRAM_INITPLR11, SDRAM_INITPLR_ENABLE | mr |
                                         SDRAM_INITPLR_IMWT_ENCODE(2));
                /* EMR OCD Default - Wait tMRD (2 MemClk cycles) */
                mtsdram(SDRAM_INITPLR12, SDRAM_INITPLR_ENABLE | OCD_CALIB_DEF |
                                         SDRAM_INITPLR_IMWT_ENCODE(2) | emr);
                /* EMR OCD Exit */
                mtsdram(SDRAM_INITPLR13, SDRAM_INITPLR_ENABLE | emr |
                                         SDRAM_INITPLR_IMWT_ENCODE(2));
        } else {
                printf("ERROR: ucode error as unknown DDR type in program_initplr");
                spd_ddr_init_hang ();
        }
}

/*------------------------------------------------------------------
 * This routine programs the SDRAM_MMODE register.
 * the selected_cas is an output parameter, that will be passed
 * by caller to call the above program_initplr( )
 *-----------------------------------------------------------------*/
static void program_mode(unsigned long *dimm_populated,
                         unsigned char *iic0_dimm_addr,
                         unsigned long num_dimm_banks,
                         ddr_cas_id_t *selected_cas,
                         int *write_recovery)
{
        unsigned long dimm_num;
        unsigned long sdram_ddr1;
        unsigned long t_wr_ns;
        unsigned long t_wr_clk;
        unsigned long cas_bit;
        unsigned long cas_index;
        unsigned long sdram_freq;
        unsigned long ddr_check;
        unsigned long mmode;
        unsigned long tcyc_reg;
        unsigned long cycle_2_0_clk;
        unsigned long cycle_2_5_clk;
        unsigned long cycle_3_0_clk;
        unsigned long cycle_4_0_clk;
        unsigned long cycle_5_0_clk;
        unsigned long max_2_0_tcyc_ns_x_100;
        unsigned long max_2_5_tcyc_ns_x_100;
        unsigned long max_3_0_tcyc_ns_x_100;
        unsigned long max_4_0_tcyc_ns_x_100;
        unsigned long max_5_0_tcyc_ns_x_100;
        unsigned long cycle_time_ns_x_100[3];
        PPC4xx_SYS_INFO board_cfg;
        unsigned char cas_2_0_available;
        unsigned char cas_2_5_available;
        unsigned char cas_3_0_available;
        unsigned char cas_4_0_available;
        unsigned char cas_5_0_available;
        unsigned long sdr_ddrpll;

        /*------------------------------------------------------------------
         * Get the board configuration info.
         *-----------------------------------------------------------------*/
        get_sys_info(&board_cfg);

        mfsdr(SDR0_DDR0, sdr_ddrpll);
        sdram_freq = MULDIV64((board_cfg.freqPLB), SDR0_DDR0_DDRM_DECODE(sdr_ddrpll), 1);
        debug("sdram_freq=%lu\n", sdram_freq);

        /*------------------------------------------------------------------
         * Handle the timing.  We need to find the worst case timing of all
         * the dimm modules installed.
         *-----------------------------------------------------------------*/
        t_wr_ns = 0;
        cas_2_0_available = true;
        cas_2_5_available = true;
        cas_3_0_available = true;
        cas_4_0_available = true;
        cas_5_0_available = true;
        max_2_0_tcyc_ns_x_100 = 10;
        max_2_5_tcyc_ns_x_100 = 10;
        max_3_0_tcyc_ns_x_100 = 10;
        max_4_0_tcyc_ns_x_100 = 10;
        max_5_0_tcyc_ns_x_100 = 10;
        sdram_ddr1 = true;

        /* loop through all the DIMM slots on the board */
        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                /* If a dimm is installed in a particular slot ... */
                if (dimm_populated[dimm_num] != SDRAM_NONE) {
                        if (dimm_populated[dimm_num] == SDRAM_DDR1)
                                sdram_ddr1 = true;
                        else
                                sdram_ddr1 = false;

                        cas_bit = spd_read(iic0_dimm_addr[dimm_num], 18);
                        debug("cas_bit[SPD byte 18]=%02lx\n", cas_bit);

                        /* For a particular DIMM, grab the three CAS values it supports */
                        for (cas_index = 0; cas_index < 3; cas_index++) {
                                switch (cas_index) {
                                case 0:
                                        tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 9);
                                        break;
                                case 1:
                                        tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 23);
                                        break;
                                default:
                                        tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 25);
                                        break;
                                }

                                if ((tcyc_reg & 0x0F) >= 10) {
                                        if ((tcyc_reg & 0x0F) == 0x0D) {
                                                /* Convert from hex to decimal */
                                                cycle_time_ns_x_100[cas_index] =
                                                        (((tcyc_reg & 0xF0) >> 4) * 100) + 75;
                                        } else {
                                                printf("ERROR: SPD reported Tcyc is incorrect for DIMM "
                                                       "in slot %d\n", (unsigned int)dimm_num);
                                                spd_ddr_init_hang ();
                                        }
                                } else {
                                        /* Convert from hex to decimal */
                                        cycle_time_ns_x_100[cas_index] =
                                                (((tcyc_reg & 0xF0) >> 4) * 100) +
                                                ((tcyc_reg & 0x0F)*10);
                                }
                                debug("cas_index=%lu: cycle_time_ns_x_100=%lu\n", cas_index,
                                      cycle_time_ns_x_100[cas_index]);
                        }

                        /* The rest of this routine determines if CAS 2.0, 2.5, 3.0, 4.0 and 5.0 are */
                        /* supported for a particular DIMM. */
                        cas_index = 0;

                        if (sdram_ddr1) {
                                /*
                                 * DDR devices use the following bitmask for CAS latency:
                                 *  Bit   7    6    5    4    3    2    1    0
                                 *       TBD  4.0  3.5  3.0  2.5  2.0  1.5  1.0
                                 */
                                if (((cas_bit & 0x40) == 0x40) && (cas_index < 3) &&
                                    (cycle_time_ns_x_100[cas_index] != 0)) {
                                        max_4_0_tcyc_ns_x_100 = max(max_4_0_tcyc_ns_x_100,
                                                                    cycle_time_ns_x_100[cas_index]);
                                        cas_index++;
                                } else {
                                        if (cas_index != 0)
                                                cas_index++;
                                        cas_4_0_available = false;
                                }

                                if (((cas_bit & 0x10) == 0x10) && (cas_index < 3) &&
                                    (cycle_time_ns_x_100[cas_index] != 0)) {
                                        max_3_0_tcyc_ns_x_100 = max(max_3_0_tcyc_ns_x_100,
                                                                    cycle_time_ns_x_100[cas_index]);
                                        cas_index++;
                                } else {
                                        if (cas_index != 0)
                                                cas_index++;
                                        cas_3_0_available = false;
                                }

                                if (((cas_bit & 0x08) == 0x08) && (cas_index < 3) &&
                                    (cycle_time_ns_x_100[cas_index] != 0)) {
                                        max_2_5_tcyc_ns_x_100 = max(max_2_5_tcyc_ns_x_100,
                                                                    cycle_time_ns_x_100[cas_index]);
                                        cas_index++;
                                } else {
                                        if (cas_index != 0)
                                                cas_index++;
                                        cas_2_5_available = false;
                                }

                                if (((cas_bit & 0x04) == 0x04) && (cas_index < 3) &&
                                    (cycle_time_ns_x_100[cas_index] != 0)) {
                                        max_2_0_tcyc_ns_x_100 = max(max_2_0_tcyc_ns_x_100,
                                                                    cycle_time_ns_x_100[cas_index]);
                                        cas_index++;
                                } else {
                                        if (cas_index != 0)
                                                cas_index++;
                                        cas_2_0_available = false;
                                }
                        } else {
                                /*
                                 * DDR2 devices use the following bitmask for CAS latency:
                                 *  Bit   7    6    5    4    3    2    1    0
                                 *       TBD  6.0  5.0  4.0  3.0  2.0  TBD  TBD
                                 */
                                if (((cas_bit & 0x20) == 0x20) && (cas_index < 3) &&
                                    (cycle_time_ns_x_100[cas_index] != 0)) {
                                        max_5_0_tcyc_ns_x_100 = max(max_5_0_tcyc_ns_x_100,
                                                                    cycle_time_ns_x_100[cas_index]);
                                        cas_index++;
                                } else {
                                        if (cas_index != 0)
                                                cas_index++;
                                        cas_5_0_available = false;
                                }

                                if (((cas_bit & 0x10) == 0x10) && (cas_index < 3) &&
                                    (cycle_time_ns_x_100[cas_index] != 0)) {
                                        max_4_0_tcyc_ns_x_100 = max(max_4_0_tcyc_ns_x_100,
                                                                    cycle_time_ns_x_100[cas_index]);
                                        cas_index++;
                                } else {
                                        if (cas_index != 0)
                                                cas_index++;
                                        cas_4_0_available = false;
                                }

                                if (((cas_bit & 0x08) == 0x08) && (cas_index < 3) &&
                                    (cycle_time_ns_x_100[cas_index] != 0)) {
                                        max_3_0_tcyc_ns_x_100 = max(max_3_0_tcyc_ns_x_100,
                                                                    cycle_time_ns_x_100[cas_index]);
                                        cas_index++;
                                } else {
                                        if (cas_index != 0)
                                                cas_index++;
                                        cas_3_0_available = false;
                                }
                        }
                }
        }

        /*------------------------------------------------------------------
         * Set the SDRAM mode, SDRAM_MMODE
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_MMODE, mmode);
        mmode = mmode & ~(SDRAM_MMODE_WR_MASK | SDRAM_MMODE_DCL_MASK);

        /* add 10 here because of rounding problems */
        cycle_2_0_clk = MULDIV64(ONE_BILLION, 100, max_2_0_tcyc_ns_x_100) + 10;
        cycle_2_5_clk = MULDIV64(ONE_BILLION, 100, max_2_5_tcyc_ns_x_100) + 10;
        cycle_3_0_clk = MULDIV64(ONE_BILLION, 100, max_3_0_tcyc_ns_x_100) + 10;
        cycle_4_0_clk = MULDIV64(ONE_BILLION, 100, max_4_0_tcyc_ns_x_100) + 10;
        cycle_5_0_clk = MULDIV64(ONE_BILLION, 100, max_5_0_tcyc_ns_x_100) + 10;
        debug("cycle_3_0_clk=%lu\n", cycle_3_0_clk);
        debug("cycle_4_0_clk=%lu\n", cycle_4_0_clk);
        debug("cycle_5_0_clk=%lu\n", cycle_5_0_clk);

        if (sdram_ddr1 == true) { /* DDR1 */
                if ((cas_2_0_available == true) &&
                        (sdram_freq <= cycle_2_0_clk)) {
                        mmode |= SDRAM_MMODE_DCL_DDR1_2_0_CLK;
                        *selected_cas = DDR_CAS_2;
                } else if ((cas_2_5_available == true) &&
                        (sdram_freq <= cycle_2_5_clk)) {
                        mmode |= SDRAM_MMODE_DCL_DDR1_2_5_CLK;
                        *selected_cas = DDR_CAS_2_5;
                } else if ((cas_3_0_available == true) &&
                        (sdram_freq <= cycle_3_0_clk)) {
                        mmode |= SDRAM_MMODE_DCL_DDR1_3_0_CLK;
                        *selected_cas = DDR_CAS_3;
                } else {
                        printf("ERROR: Cannot find a supported CAS latency with the installed DIMMs.\n");
                        printf("Only DIMMs DDR1 with CAS latencies of 2.0, 2.5, and 3.0 are supported.\n");
                        printf("Make sure the PLB speed is within the supported range of the DIMMs.\n\n");
                        spd_ddr_init_hang ();
                }
        } else { /* DDR2 */
                debug("cas_3_0_available=%d\n", cas_3_0_available);
                debug("cas_4_0_available=%d\n", cas_4_0_available);
                debug("cas_5_0_available=%d\n", cas_5_0_available);
                if ((cas_3_0_available == true) &&
                        (sdram_freq <= cycle_3_0_clk)) {
                        mmode |= SDRAM_MMODE_DCL_DDR2_3_0_CLK;
                        *selected_cas = DDR_CAS_3;
                } else if ((cas_4_0_available == true) &&
                        (sdram_freq <= cycle_4_0_clk)) {
                        mmode |= SDRAM_MMODE_DCL_DDR2_4_0_CLK;
                        *selected_cas = DDR_CAS_4;
                } else if ((cas_5_0_available == true) &&
                        (sdram_freq <= cycle_5_0_clk)) {
                        mmode |= SDRAM_MMODE_DCL_DDR2_5_0_CLK;
                        *selected_cas = DDR_CAS_5;
                } else {
                        printf("ERROR: Cannot find a supported CAS latency with the installed DIMMs.\n");
                        printf("Only DIMMs DDR2 with CAS latencies of 3.0, 4.0, and 5.0 are supported.\n");
                        printf("Make sure the PLB speed is within the supported range of the DIMMs.\n");
                        printf("cas3=%d cas4=%d cas5=%d\n",
                               cas_3_0_available, cas_4_0_available, cas_5_0_available);
                        printf("sdram_freq=%lu cycle3=%lu cycle4=%lu cycle5=%lu\n\n",
                               sdram_freq, cycle_3_0_clk, cycle_4_0_clk, cycle_5_0_clk);
                        spd_ddr_init_hang ();
                }
        }

        if (sdram_ddr1 == true)
                mmode |= SDRAM_MMODE_WR_DDR1;
        else {

                /* loop through all the DIMM slots on the board */
                for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                        /* If a dimm is installed in a particular slot ... */
                        if (dimm_populated[dimm_num] != SDRAM_NONE)
                                t_wr_ns = max(t_wr_ns, (unsigned long)
                                              spd_read(iic0_dimm_addr[dimm_num], 36) >> 2);
                }

                /*
                 * convert from nanoseconds to ddr clocks
                 * round up if necessary
                 */
                t_wr_clk = MULDIV64(sdram_freq, t_wr_ns, ONE_BILLION);
                ddr_check = MULDIV64(ONE_BILLION, t_wr_clk, t_wr_ns);
                if (sdram_freq != ddr_check)
                        t_wr_clk++;

                switch (t_wr_clk) {
                case 0:
                case 1:
                case 2:
                case 3:
                        mmode |= SDRAM_MMODE_WR_DDR2_3_CYC;
                        break;
                case 4:
                        mmode |= SDRAM_MMODE_WR_DDR2_4_CYC;
                        break;
                case 5:
                        mmode |= SDRAM_MMODE_WR_DDR2_5_CYC;
                        break;
                default:
                        mmode |= SDRAM_MMODE_WR_DDR2_6_CYC;
                        break;
                }
                *write_recovery = t_wr_clk;
        }

        debug("CAS latency = %d\n", *selected_cas);
        debug("Write recovery = %d\n", *write_recovery);

        mtsdram(SDRAM_MMODE, mmode);
}

/*-----------------------------------------------------------------------------+
 * program_rtr.
 *-----------------------------------------------------------------------------*/
static void program_rtr(unsigned long *dimm_populated,
                        unsigned char *iic0_dimm_addr,
                        unsigned long num_dimm_banks)
{
        PPC4xx_SYS_INFO board_cfg;
        unsigned long max_refresh_rate;
        unsigned long dimm_num;
        unsigned long refresh_rate_type;
        unsigned long refresh_rate;
        unsigned long rint;
        unsigned long sdram_freq;
        unsigned long sdr_ddrpll;
        unsigned long val;

        /*------------------------------------------------------------------
         * Get the board configuration info.
         *-----------------------------------------------------------------*/
        get_sys_info(&board_cfg);

        /*------------------------------------------------------------------
         * Set the SDRAM Refresh Timing Register, SDRAM_RTR
         *-----------------------------------------------------------------*/
        mfsdr(SDR0_DDR0, sdr_ddrpll);
        sdram_freq = ((board_cfg.freqPLB) * SDR0_DDR0_DDRM_DECODE(sdr_ddrpll));

        max_refresh_rate = 0;
        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                if (dimm_populated[dimm_num] != SDRAM_NONE) {

                        refresh_rate_type = spd_read(iic0_dimm_addr[dimm_num], 12);
                        refresh_rate_type &= 0x7F;
                        switch (refresh_rate_type) {
                        case 0:
                                refresh_rate =  15625;
                                break;
                        case 1:
                                refresh_rate =   3906;
                                break;
                        case 2:
                                refresh_rate =   7812;
                                break;
                        case 3:
                                refresh_rate =  31250;
                                break;
                        case 4:
                                refresh_rate =  62500;
                                break;
                        case 5:
                                refresh_rate = 125000;
                                break;
                        default:
                                refresh_rate = 0;
                                printf("ERROR: DIMM %d unsupported refresh rate/type.\n",
                                       (unsigned int)dimm_num);
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                                break;
                        }

                        max_refresh_rate = max(max_refresh_rate, refresh_rate);
                }
        }

        rint = MULDIV64(sdram_freq, max_refresh_rate, ONE_BILLION);
        mfsdram(SDRAM_RTR, val);
        mtsdram(SDRAM_RTR, (val & ~SDRAM_RTR_RINT_MASK) |
                (SDRAM_RTR_RINT_ENCODE(rint)));
}

/*------------------------------------------------------------------
 * This routine programs the SDRAM_TRx registers.
 *-----------------------------------------------------------------*/
static void program_tr(unsigned long *dimm_populated,
                       unsigned char *iic0_dimm_addr,
                       unsigned long num_dimm_banks)
{
        unsigned long dimm_num;
        unsigned long sdram_ddr1;
        unsigned long t_rp_ns;
        unsigned long t_rcd_ns;
        unsigned long t_rrd_ns;
        unsigned long t_ras_ns;
        unsigned long t_rc_ns;
        unsigned long t_rfc_ns;
        unsigned long t_wpc_ns;
        unsigned long t_wtr_ns;
        unsigned long t_rpc_ns;
        unsigned long t_rp_clk;
        unsigned long t_rcd_clk;
        unsigned long t_rrd_clk;
        unsigned long t_ras_clk;
        unsigned long t_rc_clk;
        unsigned long t_rfc_clk;
        unsigned long t_wpc_clk;
        unsigned long t_wtr_clk;
        unsigned long t_rpc_clk;
        unsigned long sdtr1, sdtr2, sdtr3;
        unsigned long ddr_check;
        unsigned long sdram_freq;
        unsigned long sdr_ddrpll;

        PPC4xx_SYS_INFO board_cfg;

        /*------------------------------------------------------------------
         * Get the board configuration info.
         *-----------------------------------------------------------------*/
        get_sys_info(&board_cfg);

        mfsdr(SDR0_DDR0, sdr_ddrpll);
        sdram_freq = ((board_cfg.freqPLB) * SDR0_DDR0_DDRM_DECODE(sdr_ddrpll));

        /*------------------------------------------------------------------
         * Handle the timing.  We need to find the worst case timing of all
         * the dimm modules installed.
         *-----------------------------------------------------------------*/
        t_rp_ns = 0;
        t_rrd_ns = 0;
        t_rcd_ns = 0;
        t_ras_ns = 0;
        t_rc_ns = 0;
        t_rfc_ns = 0;
        t_wpc_ns = 0;
        t_wtr_ns = 0;
        t_rpc_ns = 0;
        sdram_ddr1 = true;

        /* loop through all the DIMM slots on the board */
        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                /* If a dimm is installed in a particular slot ... */
                if (dimm_populated[dimm_num] != SDRAM_NONE) {
                        if (dimm_populated[dimm_num] == SDRAM_DDR2)
                                sdram_ddr1 = true;
                        else
                                sdram_ddr1 = false;

                        t_rcd_ns = max(t_rcd_ns,
                                       (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 29) >> 2);
                        t_rrd_ns = max(t_rrd_ns,
                                       (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 28) >> 2);
                        t_rp_ns  = max(t_rp_ns,
                                       (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 27) >> 2);
                        t_ras_ns = max(t_ras_ns,
                                       (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 30));
                        t_rc_ns  = max(t_rc_ns,
                                       (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 41));
                        t_rfc_ns = max(t_rfc_ns,
                                       (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 42));
                }
        }

        /*------------------------------------------------------------------
         * Set the SDRAM Timing Reg 1, SDRAM_TR1
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_SDTR1, sdtr1);
        sdtr1 &= ~(SDRAM_SDTR1_LDOF_MASK | SDRAM_SDTR1_RTW_MASK |
                   SDRAM_SDTR1_WTWO_MASK | SDRAM_SDTR1_RTRO_MASK);

        /* default values */
        sdtr1 |= SDRAM_SDTR1_LDOF_2_CLK;
        sdtr1 |= SDRAM_SDTR1_RTW_2_CLK;

        /* normal operations */
        sdtr1 |= SDRAM_SDTR1_WTWO_0_CLK;
        sdtr1 |= SDRAM_SDTR1_RTRO_1_CLK;

        mtsdram(SDRAM_SDTR1, sdtr1);

        /*------------------------------------------------------------------
         * Set the SDRAM Timing Reg 2, SDRAM_TR2
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_SDTR2, sdtr2);
        sdtr2 &= ~(SDRAM_SDTR2_RCD_MASK  | SDRAM_SDTR2_WTR_MASK |
                   SDRAM_SDTR2_XSNR_MASK | SDRAM_SDTR2_WPC_MASK |
                   SDRAM_SDTR2_RPC_MASK  | SDRAM_SDTR2_RP_MASK  |
                   SDRAM_SDTR2_RRD_MASK);

        /*
         * convert t_rcd from nanoseconds to ddr clocks
         * round up if necessary
         */
        t_rcd_clk = MULDIV64(sdram_freq, t_rcd_ns, ONE_BILLION);
        ddr_check = MULDIV64(ONE_BILLION, t_rcd_clk, t_rcd_ns);
        if (sdram_freq != ddr_check)
                t_rcd_clk++;

        switch (t_rcd_clk) {
        case 0:
        case 1:
                sdtr2 |= SDRAM_SDTR2_RCD_1_CLK;
                break;
        case 2:
                sdtr2 |= SDRAM_SDTR2_RCD_2_CLK;
                break;
        case 3:
                sdtr2 |= SDRAM_SDTR2_RCD_3_CLK;
                break;
        case 4:
                sdtr2 |= SDRAM_SDTR2_RCD_4_CLK;
                break;
        default:
                sdtr2 |= SDRAM_SDTR2_RCD_5_CLK;
                break;
        }

        if (sdram_ddr1 == true) { /* DDR1 */
                if (sdram_freq < 200000000) {
                        sdtr2 |= SDRAM_SDTR2_WTR_1_CLK;
                        sdtr2 |= SDRAM_SDTR2_WPC_2_CLK;
                        sdtr2 |= SDRAM_SDTR2_RPC_2_CLK;
                } else {
                        sdtr2 |= SDRAM_SDTR2_WTR_2_CLK;
                        sdtr2 |= SDRAM_SDTR2_WPC_3_CLK;
                        sdtr2 |= SDRAM_SDTR2_RPC_2_CLK;
                }
        } else { /* DDR2 */
                /* loop through all the DIMM slots on the board */
                for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                        /* If a dimm is installed in a particular slot ... */
                        if (dimm_populated[dimm_num] != SDRAM_NONE) {
                                t_wpc_ns = max(t_wtr_ns,
                                               (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 36) >> 2);
                                t_wtr_ns = max(t_wtr_ns,
                                               (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 37) >> 2);
                                t_rpc_ns = max(t_rpc_ns,
                                               (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 38) >> 2);
                        }
                }

                /*
                 * convert from nanoseconds to ddr clocks
                 * round up if necessary
                 */
                t_wpc_clk = MULDIV64(sdram_freq, t_wpc_ns, ONE_BILLION);
                ddr_check = MULDIV64(ONE_BILLION, t_wpc_clk, t_wpc_ns);
                if (sdram_freq != ddr_check)
                        t_wpc_clk++;

                switch (t_wpc_clk) {
                case 0:
                case 1:
                case 2:
                        sdtr2 |= SDRAM_SDTR2_WPC_2_CLK;
                        break;
                case 3:
                        sdtr2 |= SDRAM_SDTR2_WPC_3_CLK;
                        break;
                case 4:
                        sdtr2 |= SDRAM_SDTR2_WPC_4_CLK;
                        break;
                case 5:
                        sdtr2 |= SDRAM_SDTR2_WPC_5_CLK;
                        break;
                default:
                        sdtr2 |= SDRAM_SDTR2_WPC_6_CLK;
                        break;
                }

                /*
                 * convert from nanoseconds to ddr clocks
                 * round up if necessary
                 */
                t_wtr_clk = MULDIV64(sdram_freq, t_wtr_ns, ONE_BILLION);
                ddr_check = MULDIV64(ONE_BILLION, t_wtr_clk, t_wtr_ns);
                if (sdram_freq != ddr_check)
                        t_wtr_clk++;

                switch (t_wtr_clk) {
                case 0:
                case 1:
                        sdtr2 |= SDRAM_SDTR2_WTR_1_CLK;
                        break;
                case 2:
                        sdtr2 |= SDRAM_SDTR2_WTR_2_CLK;
                        break;
                case 3:
                        sdtr2 |= SDRAM_SDTR2_WTR_3_CLK;
                        break;
                default:
                        sdtr2 |= SDRAM_SDTR2_WTR_4_CLK;
                        break;
                }

                /*
                 * convert from nanoseconds to ddr clocks
                 * round up if necessary
                 */
                t_rpc_clk = MULDIV64(sdram_freq, t_rpc_ns, ONE_BILLION);

                ddr_check = MULDIV64(ONE_BILLION, t_rpc_clk, t_rpc_ns);
                if (sdram_freq != ddr_check)
                        t_rpc_clk++;

                switch (t_rpc_clk) {
                case 0:
                case 1:
                case 2:
                        sdtr2 |= SDRAM_SDTR2_RPC_2_CLK;
                        break;
                case 3:
                        sdtr2 |= SDRAM_SDTR2_RPC_3_CLK;
                        break;
                default:
                        sdtr2 |= SDRAM_SDTR2_RPC_4_CLK;
                        break;
                }
        }

        /* default value */
        sdtr2 |= SDRAM_SDTR2_XSNR_16_CLK;

        /*
         * convert t_rrd from nanoseconds to ddr clocks
         * round up if necessary
         */
        t_rrd_clk = MULDIV64(sdram_freq, t_rrd_ns, ONE_BILLION);
        ddr_check = MULDIV64(ONE_BILLION, t_rrd_clk, t_rrd_ns);
        if (sdram_freq != ddr_check)
                t_rrd_clk++;

        if (t_rrd_clk == 3)
                sdtr2 |= SDRAM_SDTR2_RRD_3_CLK;
        else
                sdtr2 |= SDRAM_SDTR2_RRD_2_CLK;

        /*
         * convert t_rp from nanoseconds to ddr clocks
         * round up if necessary
         */
        t_rp_clk = MULDIV64(sdram_freq, t_rp_ns, ONE_BILLION);
        ddr_check = MULDIV64(ONE_BILLION, t_rp_clk, t_rp_ns);
        if (sdram_freq != ddr_check)
                t_rp_clk++;

        switch (t_rp_clk) {
        case 0:
        case 1:
        case 2:
        case 3:
                sdtr2 |= SDRAM_SDTR2_RP_3_CLK;
                break;
        case 4:
                sdtr2 |= SDRAM_SDTR2_RP_4_CLK;
                break;
        case 5:
                sdtr2 |= SDRAM_SDTR2_RP_5_CLK;
                break;
        case 6:
                sdtr2 |= SDRAM_SDTR2_RP_6_CLK;
                break;
        default:
                sdtr2 |= SDRAM_SDTR2_RP_7_CLK;
                break;
        }

        mtsdram(SDRAM_SDTR2, sdtr2);

        /*------------------------------------------------------------------
         * Set the SDRAM Timing Reg 3, SDRAM_TR3
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_SDTR3, sdtr3);
        sdtr3 &= ~(SDRAM_SDTR3_RAS_MASK  | SDRAM_SDTR3_RC_MASK |
                   SDRAM_SDTR3_XCS_MASK | SDRAM_SDTR3_RFC_MASK);

        /*
         * convert t_ras from nanoseconds to ddr clocks
         * round up if necessary
         */
        t_ras_clk = MULDIV64(sdram_freq, t_ras_ns, ONE_BILLION);
        ddr_check = MULDIV64(ONE_BILLION, t_ras_clk, t_ras_ns);
        if (sdram_freq != ddr_check)
                t_ras_clk++;

        sdtr3 |= SDRAM_SDTR3_RAS_ENCODE(t_ras_clk);

        /*
         * convert t_rc from nanoseconds to ddr clocks
         * round up if necessary
         */
        t_rc_clk = MULDIV64(sdram_freq, t_rc_ns, ONE_BILLION);
        ddr_check = MULDIV64(ONE_BILLION, t_rc_clk, t_rc_ns);
        if (sdram_freq != ddr_check)
                t_rc_clk++;

        sdtr3 |= SDRAM_SDTR3_RC_ENCODE(t_rc_clk);

        /* default xcs value */
        sdtr3 |= SDRAM_SDTR3_XCS;

        /*
         * convert t_rfc from nanoseconds to ddr clocks
         * round up if necessary
         */
        t_rfc_clk = MULDIV64(sdram_freq, t_rfc_ns, ONE_BILLION);
        ddr_check = MULDIV64(ONE_BILLION, t_rfc_clk, t_rfc_ns);
        if (sdram_freq != ddr_check)
                t_rfc_clk++;

        sdtr3 |= SDRAM_SDTR3_RFC_ENCODE(t_rfc_clk);

        mtsdram(SDRAM_SDTR3, sdtr3);
}

/*-----------------------------------------------------------------------------+
 * program_bxcf.
 *-----------------------------------------------------------------------------*/
static void program_bxcf(unsigned long *dimm_populated,
                         unsigned char *iic0_dimm_addr,
                         unsigned long num_dimm_banks)
{
        unsigned long dimm_num;
        unsigned long num_col_addr;
        unsigned long num_ranks;
        unsigned long num_banks;
        unsigned long mode;
        unsigned long ind_rank;
        unsigned long ind;
        unsigned long ind_bank;
        unsigned long bank_0_populated;

        /*------------------------------------------------------------------
         * Set the BxCF regs.  First, wipe out the bank config registers.
         *-----------------------------------------------------------------*/
        mtsdram(SDRAM_MB0CF, 0x00000000);
        mtsdram(SDRAM_MB1CF, 0x00000000);
        mtsdram(SDRAM_MB2CF, 0x00000000);
        mtsdram(SDRAM_MB3CF, 0x00000000);

        mode = SDRAM_BXCF_M_BE_ENABLE;

        bank_0_populated = 0;

        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                if (dimm_populated[dimm_num] != SDRAM_NONE) {
                        num_col_addr = spd_read(iic0_dimm_addr[dimm_num], 4);
                        num_ranks = spd_read(iic0_dimm_addr[dimm_num], 5);
                        if ((spd_read(iic0_dimm_addr[dimm_num], 2)) == 0x08)
                                num_ranks = (num_ranks & 0x0F) +1;
                        else
                                num_ranks = num_ranks & 0x0F;

                        num_banks = spd_read(iic0_dimm_addr[dimm_num], 17);

                        for (ind_bank = 0; ind_bank < 2; ind_bank++) {
                                if (num_banks == 4)
                                        ind = 0;
                                else
                                        ind = 5 << 8;
                                switch (num_col_addr) {
                                case 0x08:
                                        mode |= (SDRAM_BXCF_M_AM_0 + ind);
                                        break;
                                case 0x09:
                                        mode |= (SDRAM_BXCF_M_AM_1 + ind);
                                        break;
                                case 0x0A:
                                        mode |= (SDRAM_BXCF_M_AM_2 + ind);
                                        break;
                                case 0x0B:
                                        mode |= (SDRAM_BXCF_M_AM_3 + ind);
                                        break;
                                case 0x0C:
                                        mode |= (SDRAM_BXCF_M_AM_4 + ind);
                                        break;
                                default:
                                        printf("DDR-SDRAM: DIMM %d BxCF configuration.\n",
                                               (unsigned int)dimm_num);
                                        printf("ERROR: Unsupported value for number of "
                                               "column addresses: %d.\n", (unsigned int)num_col_addr);
                                        printf("Replace the DIMM module with a supported DIMM.\n\n");
                                        spd_ddr_init_hang ();
                                }
                        }

                        if ((dimm_populated[dimm_num] != SDRAM_NONE)&& (dimm_num ==1))
                                bank_0_populated = 1;

                        for (ind_rank = 0; ind_rank < num_ranks; ind_rank++) {
                                mtsdram(SDRAM_MB0CF +
                                        ((dimm_num + bank_0_populated + ind_rank) << 2),
                                        mode);
                        }
                }
        }
}

/*------------------------------------------------------------------
 * program memory queue.
 *-----------------------------------------------------------------*/
static void program_memory_queue(unsigned long *dimm_populated,
                                 unsigned char *iic0_dimm_addr,
                                 unsigned long num_dimm_banks)
{
        unsigned long dimm_num;
        phys_size_t rank_base_addr;
        unsigned long rank_reg;
        phys_size_t rank_size_bytes;
        unsigned long rank_size_id;
        unsigned long num_ranks;
        unsigned long baseadd_size;
        unsigned long i;
        unsigned long bank_0_populated = 0;
        phys_size_t total_size = 0;

        /*------------------------------------------------------------------
         * Reset the rank_base_address.
         *-----------------------------------------------------------------*/
        rank_reg   = SDRAM_R0BAS;

        rank_base_addr = 0x00000000;

        for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
                if (dimm_populated[dimm_num] != SDRAM_NONE) {
                        num_ranks = spd_read(iic0_dimm_addr[dimm_num], 5);
                        if ((spd_read(iic0_dimm_addr[dimm_num], 2)) == 0x08)
                                num_ranks = (num_ranks & 0x0F) + 1;
                        else
                                num_ranks = num_ranks & 0x0F;

                        rank_size_id = spd_read(iic0_dimm_addr[dimm_num], 31);

                        /*------------------------------------------------------------------
                         * Set the sizes
                         *-----------------------------------------------------------------*/
                        baseadd_size = 0;
                        switch (rank_size_id) {
                        case 0x01:
                                baseadd_size |= SDRAM_RXBAS_SDSZ_1024;
                                total_size = 1024;
                                break;
                        case 0x02:
                                baseadd_size |= SDRAM_RXBAS_SDSZ_2048;
                                total_size = 2048;
                                break;
                        case 0x04:
                                baseadd_size |= SDRAM_RXBAS_SDSZ_4096;
                                total_size = 4096;
                                break;
                        case 0x08:
                                baseadd_size |= SDRAM_RXBAS_SDSZ_32;
                                total_size = 32;
                                break;
                        case 0x10:
                                baseadd_size |= SDRAM_RXBAS_SDSZ_64;
                                total_size = 64;
                                break;
                        case 0x20:
                                baseadd_size |= SDRAM_RXBAS_SDSZ_128;
                                total_size = 128;
                                break;
                        case 0x40:
                                baseadd_size |= SDRAM_RXBAS_SDSZ_256;
                                total_size = 256;
                                break;
                        case 0x80:
                                baseadd_size |= SDRAM_RXBAS_SDSZ_512;
                                total_size = 512;
                                break;
                        default:
                                printf("DDR-SDRAM: DIMM %d memory queue configuration.\n",
                                       (unsigned int)dimm_num);
                                printf("ERROR: Unsupported value for the banksize: %d.\n",
                                       (unsigned int)rank_size_id);
                                printf("Replace the DIMM module with a supported DIMM.\n\n");
                                spd_ddr_init_hang ();
                        }
                        rank_size_bytes = total_size << 20;

                        if ((dimm_populated[dimm_num] != SDRAM_NONE) && (dimm_num == 1))
                                bank_0_populated = 1;

                        for (i = 0; i < num_ranks; i++) {
                                mtdcr_any(rank_reg+i+dimm_num+bank_0_populated,
                                          (SDRAM_RXBAS_SDBA_ENCODE(rank_base_addr) |
                                           baseadd_size));
                                rank_base_addr += rank_size_bytes;
                        }
                }
        }

#if defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
    defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
    defined(CONFIG_460SX)
        /*
         * Enable high bandwidth access
         * This is currently not used, but with this setup
         * it is possible to use it later on in e.g. the Linux
         * EMAC driver for performance gain.
         */
        mtdcr(SDRAM_PLBADDULL, 0x00000000); /* MQ0_BAUL */
        mtdcr(SDRAM_PLBADDUHB, 0x00000008); /* MQ0_BAUH */

        /*
         * Set optimal value for Memory Queue HB/LL Configuration registers
         */
        mtdcr(SDRAM_CONF1HB, (mfdcr(SDRAM_CONF1HB) & ~SDRAM_CONF1HB_MASK) |
              SDRAM_CONF1HB_AAFR | SDRAM_CONF1HB_RPEN | SDRAM_CONF1HB_RFTE |
              SDRAM_CONF1HB_RPLM | SDRAM_CONF1HB_WRCL);
        mtdcr(SDRAM_CONF1LL, (mfdcr(SDRAM_CONF1LL) & ~SDRAM_CONF1LL_MASK) |
              SDRAM_CONF1LL_AAFR | SDRAM_CONF1LL_RPEN | SDRAM_CONF1LL_RFTE |
              SDRAM_CONF1LL_RPLM);
        mtdcr(SDRAM_CONFPATHB, mfdcr(SDRAM_CONFPATHB) | SDRAM_CONFPATHB_TPEN);
#endif
}

#ifdef CONFIG_DDR_ECC
/*-----------------------------------------------------------------------------+
 * program_ecc.
 *-----------------------------------------------------------------------------*/
static void program_ecc(unsigned long *dimm_populated,
                        unsigned char *iic0_dimm_addr,
                        unsigned long num_dimm_banks,
                        unsigned long tlb_word2_i_value)
{
        unsigned long dimm_num;
        unsigned long ecc;

        ecc = 0;
        /* loop through all the DIMM slots on the board */
        for (dimm_num = 0; dimm_num < MAXDIMMS; dimm_num++) {
                /* If a dimm is installed in a particular slot ... */
                if (dimm_populated[dimm_num] != SDRAM_NONE)
                        ecc = max(ecc,
                                  (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 11));
        }
        if (ecc == 0)
                return;

        do_program_ecc(tlb_word2_i_value);
}
#endif

#if !defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
/*-----------------------------------------------------------------------------+
 * program_DQS_calibration.
 *-----------------------------------------------------------------------------*/
static void program_DQS_calibration(unsigned long *dimm_populated,
                                    unsigned char *iic0_dimm_addr,
                                    unsigned long num_dimm_banks)
{
        unsigned long val;

#ifdef HARD_CODED_DQS /* calibration test with hardvalues */
        mtsdram(SDRAM_RQDC, 0x80000037);
        mtsdram(SDRAM_RDCC, 0x40000000);
        mtsdram(SDRAM_RFDC, 0x000001DF);

        test();
#else
        /*------------------------------------------------------------------
         * Program RDCC register
         * Read sample cycle auto-update enable
         *-----------------------------------------------------------------*/

        mfsdram(SDRAM_RDCC, val);
        mtsdram(SDRAM_RDCC,
                (val & ~(SDRAM_RDCC_RDSS_MASK | SDRAM_RDCC_RSAE_MASK))
                | SDRAM_RDCC_RSAE_ENABLE);

        /*------------------------------------------------------------------
         * Program RQDC register
         * Internal DQS delay mechanism enable
         *-----------------------------------------------------------------*/
        mtsdram(SDRAM_RQDC, (SDRAM_RQDC_RQDE_ENABLE|SDRAM_RQDC_RQFD_ENCODE(0x38)));

        /*------------------------------------------------------------------
         * Program RFDC register
         * Set Feedback Fractional Oversample
         * Auto-detect read sample cycle enable
         * Set RFOS to 1/4 of memclk cycle (0x3f)
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_RFDC, val);
        mtsdram(SDRAM_RFDC,
                (val & ~(SDRAM_RFDC_ARSE_MASK | SDRAM_RFDC_RFOS_MASK |
                         SDRAM_RFDC_RFFD_MASK))
                | (SDRAM_RFDC_ARSE_ENABLE | SDRAM_RFDC_RFOS_ENCODE(0x3f) |
                   SDRAM_RFDC_RFFD_ENCODE(0)));

        DQS_calibration_process();
#endif
}

static int short_mem_test(void)
{
        u32 *membase;
        u32 bxcr_num;
        u32 bxcf;
        int i;
        int j;
        phys_size_t base_addr;
        u32 test[NUMMEMTESTS][NUMMEMWORDS] = {
                {0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
                 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF},
                {0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
                 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000},
                {0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
                 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555},
                {0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
                 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA},
                {0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
                 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A},
                {0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
                 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5},
                {0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
                 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA},
                {0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
                 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55} };
        int l;

        for (bxcr_num = 0; bxcr_num < MAXBXCF; bxcr_num++) {
                mfsdram(SDRAM_MB0CF + (bxcr_num << 2), bxcf);

                /* Banks enabled */
                if ((bxcf & SDRAM_BXCF_M_BE_MASK) == SDRAM_BXCF_M_BE_ENABLE) {
                        /* Bank is enabled */

                        /*
                         * Only run test on accessable memory (below 2GB)
                         */
                        base_addr = SDRAM_RXBAS_SDBA_DECODE(mfdcr_any(SDRAM_R0BAS+bxcr_num));
                        if (base_addr >= CONFIG_MAX_MEM_MAPPED)
                                continue;

                        /*------------------------------------------------------------------
                         * Run the short memory test.
                         *-----------------------------------------------------------------*/
                        membase = (u32 *)(u32)base_addr;

                        for (i = 0; i < NUMMEMTESTS; i++) {
                                for (j = 0; j < NUMMEMWORDS; j++) {
                                        membase[j] = test[i][j];
                                        ppcDcbf((u32)&(membase[j]));
                                }
                                sync();
                                for (l=0; l<NUMLOOPS; l++) {
                                        for (j = 0; j < NUMMEMWORDS; j++) {
                                                if (membase[j] != test[i][j]) {
                                                        ppcDcbf((u32)&(membase[j]));
                                                        return 0;
                                                }
                                                ppcDcbf((u32)&(membase[j]));
                                        }
                                        sync();
                                }
                        }
                }       /* if bank enabled */
        }               /* for bxcf_num */

        return 1;
}

#ifndef HARD_CODED_DQS
/*-----------------------------------------------------------------------------+
 * DQS_calibration_process.
 *-----------------------------------------------------------------------------*/
static void DQS_calibration_process(void)
{
        unsigned long rfdc_reg;
        unsigned long rffd;
        unsigned long val;
        long rffd_average;
        long max_start;
        unsigned long dlycal;
        unsigned long dly_val;
        unsigned long max_pass_length;
        unsigned long current_pass_length;
        unsigned long current_fail_length;
        unsigned long current_start;
        long max_end;
        unsigned char fail_found;
        unsigned char pass_found;
#if !defined(CONFIG_DDR_RQDC_FIXED)
        int window_found;
        u32 rqdc_reg;
        u32 rqfd;
        u32 rqfd_start;
        u32 rqfd_average;
        int loopi = 0;
        char str[] = "Auto calibration -";
        char slash[] = "\\|/-\\|/-";

        /*------------------------------------------------------------------
         * Test to determine the best read clock delay tuning bits.
         *
         * Before the DDR controller can be used, the read clock delay needs to be
         * set.  This is SDRAM_RQDC[RQFD] and SDRAM_RFDC[RFFD].
         * This value cannot be hardcoded into the program because it changes
         * depending on the board's setup and environment.
         * To do this, all delay values are tested to see if they
         * work or not.  By doing this, you get groups of fails with groups of
         * passing values.  The idea is to find the start and end of a passing
         * window and take the center of it to use as the read clock delay.
         *
         * A failure has to be seen first so that when we hit a pass, we know
         * that it is truely the start of the window.  If we get passing values
         * to start off with, we don't know if we are at the start of the window.
         *
         * The code assumes that a failure will always be found.
         * If a failure is not found, there is no easy way to get the middle
         * of the passing window.  I guess we can pretty much pick any value
         * but some values will be better than others.  Since the lowest speed
         * we can clock the DDR interface at is 200 MHz (2x 100 MHz PLB speed),
         * from experimentation it is safe to say you will always have a failure.
         *-----------------------------------------------------------------*/

        /* first fix RQDC[RQFD] to an average of 80 degre phase shift to find RFDC[RFFD] */
        rqfd_start = 64; /* test-only: don't know if this is the _best_ start value */

        puts(str);

calibration_loop:
        mfsdram(SDRAM_RQDC, rqdc_reg);
        mtsdram(SDRAM_RQDC, (rqdc_reg & ~SDRAM_RQDC_RQFD_MASK) |
                SDRAM_RQDC_RQFD_ENCODE(rqfd_start));
#else /* CONFIG_DDR_RQDC_FIXED */
        /*
         * On Katmai the complete auto-calibration somehow doesn't seem to
         * produce the best results, meaning optimal values for RQFD/RFFD.
         * This was discovered by GDA using a high bandwidth scope,
         * analyzing the DDR2 signals. GDA provided a fixed value for RQFD,
         * so now on Katmai "only" RFFD is auto-calibrated.
         */
        mtsdram(SDRAM_RQDC, CONFIG_DDR_RQDC_FIXED);
#endif /* CONFIG_DDR_RQDC_FIXED */

        max_start = 0;

        max_pass_length = 0;
        max_start = 0;
        max_end = 0;
        current_pass_length = 0;
        current_fail_length = 0;
        current_start = 0;
        fail_found = false;
        pass_found = false;

        /*
         * get the delay line calibration register value
         */
        mfsdram(SDRAM_DLCR, dlycal);
        dly_val = SDRAM_DLYCAL_DLCV_DECODE(dlycal) << 2;

        for (rffd = 0; rffd <= SDRAM_RFDC_RFFD_MAX; rffd++) {
                mfsdram(SDRAM_RFDC, rfdc_reg);
                rfdc_reg &= ~(SDRAM_RFDC_RFFD_MASK);

                /*------------------------------------------------------------------
                 * Set the timing reg for the test.
                 *-----------------------------------------------------------------*/
                mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd));

                /*------------------------------------------------------------------
                 * See if the rffd value passed.
                 *-----------------------------------------------------------------*/
                if (short_mem_test()) {
                        if (fail_found == true) {
                                pass_found = true;
                                if (current_pass_length == 0)
                                        current_start = rffd;

                                current_fail_length = 0;
                                current_pass_length++;

                                if (current_pass_length > max_pass_length) {
                                        max_pass_length = current_pass_length;
                                        max_start = current_start;
                                        max_end = rffd;
                                }
                        }
                } else {
                        current_pass_length = 0;
                        current_fail_length++;

                        if (current_fail_length >= (dly_val >> 2)) {
                                if (fail_found == false)
                                        fail_found = true;
                                else if (pass_found == true)
                                        break;
                        }
                }
        }               /* for rffd */

        /*------------------------------------------------------------------
         * Set the average RFFD value
         *-----------------------------------------------------------------*/
        rffd_average = ((max_start + max_end) >> 1);

        if (rffd_average < 0)
                rffd_average = 0;

        if (rffd_average > SDRAM_RFDC_RFFD_MAX)
                rffd_average = SDRAM_RFDC_RFFD_MAX;
        /* now fix RFDC[RFFD] found and find RQDC[RQFD] */
        mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd_average));

#if !defined(CONFIG_DDR_RQDC_FIXED)
        max_pass_length = 0;
        max_start = 0;
        max_end = 0;
        current_pass_length = 0;
        current_fail_length = 0;
        current_start = 0;
        window_found = false;
        fail_found = false;
        pass_found = false;

        for (rqfd = 0; rqfd <= SDRAM_RQDC_RQFD_MAX; rqfd++) {
                mfsdram(SDRAM_RQDC, rqdc_reg);
                rqdc_reg &= ~(SDRAM_RQDC_RQFD_MASK);

                /*------------------------------------------------------------------
                 * Set the timing reg for the test.
                 *-----------------------------------------------------------------*/
                mtsdram(SDRAM_RQDC, rqdc_reg | SDRAM_RQDC_RQFD_ENCODE(rqfd));

                /*------------------------------------------------------------------
                 * See if the rffd value passed.
                 *-----------------------------------------------------------------*/
                if (short_mem_test()) {
                        if (fail_found == true) {
                                pass_found = true;
                                if (current_pass_length == 0)
                                        current_start = rqfd;

                                current_fail_length = 0;
                                current_pass_length++;

                                if (current_pass_length > max_pass_length) {
                                        max_pass_length = current_pass_length;
                                        max_start = current_start;
                                        max_end = rqfd;
                                }
                        }
                } else {
                        current_pass_length = 0;
                        current_fail_length++;

                        if (fail_found == false) {
                                fail_found = true;
                        } else if (pass_found == true) {
                                window_found = true;
                                break;
                        }
                }
        }

        rqfd_average = ((max_start + max_end) >> 1);

        /*------------------------------------------------------------------
         * Make sure we found the valid read passing window.  Halt if not
         *-----------------------------------------------------------------*/
        if (window_found == false) {
                if (rqfd_start < SDRAM_RQDC_RQFD_MAX) {
                        putc('\b');
                        putc(slash[loopi++ % 8]);

                        /* try again from with a different RQFD start value */
                        rqfd_start++;
                        goto calibration_loop;
                }

                printf("\nERROR: Cannot determine a common read delay for the "
                       "DIMM(s) installed.\n");
                debug("%s[%d] ERROR : \n", __FUNCTION__,__LINE__);
                ppc4xx_ibm_ddr2_register_dump();
                spd_ddr_init_hang ();
        }

        if (rqfd_average < 0)
                rqfd_average = 0;

        if (rqfd_average > SDRAM_RQDC_RQFD_MAX)
                rqfd_average = SDRAM_RQDC_RQFD_MAX;

        mtsdram(SDRAM_RQDC,
                (rqdc_reg & ~SDRAM_RQDC_RQFD_MASK) |
                SDRAM_RQDC_RQFD_ENCODE(rqfd_average));

        blank_string(strlen(str));
#endif /* CONFIG_DDR_RQDC_FIXED */

        mfsdram(SDRAM_DLCR, val);
        debug("%s[%d] DLCR: 0x%08lX\n", __FUNCTION__, __LINE__, val);
        mfsdram(SDRAM_RQDC, val);
        debug("%s[%d] RQDC: 0x%08lX\n", __FUNCTION__, __LINE__, val);
        mfsdram(SDRAM_RFDC, val);
        debug("%s[%d] RFDC: 0x%08lX\n", __FUNCTION__, __LINE__, val);
        mfsdram(SDRAM_RDCC, val);
        debug("%s[%d] RDCC: 0x%08lX\n", __FUNCTION__, __LINE__, val);
}
#else /* calibration test with hardvalues */
/*-----------------------------------------------------------------------------+
 * DQS_calibration_process.
 *-----------------------------------------------------------------------------*/
static void test(void)
{
        unsigned long dimm_num;
        unsigned long ecc_temp;
        unsigned long i, j;
        unsigned long *membase;
        unsigned long bxcf[MAXRANKS];
        unsigned long val;
        char window_found;
        char begin_found[MAXDIMMS];
        char end_found[MAXDIMMS];
        char search_end[MAXDIMMS];
        unsigned long test[NUMMEMTESTS][NUMMEMWORDS] = {
                {0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
                 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF},
                {0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
                 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000},
                {0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
                 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555},
                {0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
                 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA},
                {0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
                 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A},
                {0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
                 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5},
                {0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
                 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA},
                {0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
                 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55} };

        /*------------------------------------------------------------------
         * Test to determine the best read clock delay tuning bits.
         *
         * Before the DDR controller can be used, the read clock delay needs to be
         * set.  This is SDRAM_RQDC[RQFD] and SDRAM_RFDC[RFFD].
         * This value cannot be hardcoded into the program because it changes
         * depending on the board's setup and environment.
         * To do this, all delay values are tested to see if they
         * work or not.  By doing this, you get groups of fails with groups of
         * passing values.  The idea is to find the start and end of a passing
         * window and take the center of it to use as the read clock delay.
         *
         * A failure has to be seen first so that when we hit a pass, we know
         * that it is truely the start of the window.  If we get passing values
         * to start off with, we don't know if we are at the start of the window.
         *
         * The code assumes that a failure will always be found.
         * If a failure is not found, there is no easy way to get the middle
         * of the passing window.  I guess we can pretty much pick any value
         * but some values will be better than others.  Since the lowest speed
         * we can clock the DDR interface at is 200 MHz (2x 100 MHz PLB speed),
         * from experimentation it is safe to say you will always have a failure.
         *-----------------------------------------------------------------*/
        mfsdram(SDRAM_MCOPT1, ecc_temp);
        ecc_temp &= SDRAM_MCOPT1_MCHK_MASK;
        mfsdram(SDRAM_MCOPT1, val);
        mtsdram(SDRAM_MCOPT1, (val & ~SDRAM_MCOPT1_MCHK_MASK) |
                SDRAM_MCOPT1_MCHK_NON);

        window_found = false;
        begin_found[0] = false;
        end_found[0] = false;
        search_end[0] = false;
        begin_found[1] = false;
        end_found[1] = false;
        search_end[1] = false;

        for (dimm_num = 0; dimm_num < MAXDIMMS; dimm_num++) {
                mfsdram(SDRAM_MB0CF + (bxcr_num << 2), bxcf[bxcr_num]);

                /* Banks enabled */
                if ((bxcf[dimm_num] & SDRAM_BXCF_M_BE_MASK) == SDRAM_BXCF_M_BE_ENABLE) {

                        /* Bank is enabled */
                        membase =
                                (unsigned long*)(SDRAM_RXBAS_SDBA_DECODE(mfdcr_any(SDRAM_R0BAS+dimm_num)));

                        /*------------------------------------------------------------------
                         * Run the short memory test.
                         *-----------------------------------------------------------------*/
                        for (i = 0; i < NUMMEMTESTS; i++) {
                                for (j = 0; j < NUMMEMWORDS; j++) {
                                        membase[j] = test[i][j];
                                        ppcDcbf((u32)&(membase[j]));
                                }
                                sync();
                                for (j = 0; j < NUMMEMWORDS; j++) {
                                        if (membase[j] != test[i][j]) {
                                                ppcDcbf((u32)&(membase[j]));
                                                break;
                                        }
                                        ppcDcbf((u32)&(membase[j]));
                                }
                                sync();
                                if (j < NUMMEMWORDS)
                                        break;
                        }

                        /*------------------------------------------------------------------
                         * See if the rffd value passed.
                         *-----------------------------------------------------------------*/
                        if (i < NUMMEMTESTS) {
                                if ((end_found[dimm_num] == false) &&
                                    (search_end[dimm_num] == true)) {
                                        end_found[dimm_num] = true;
                                }
                                if ((end_found[0] == true) &&
                                    (end_found[1] == true))
                                        break;
                        } else {
                                if (begin_found[dimm_num] == false) {
                                        begin_found[dimm_num] = true;
                                        search_end[dimm_num] = true;
                                }
                        }
                } else {
                        begin_found[dimm_num] = true;
                        end_found[dimm_num] = true;
                }
        }

        if ((begin_found[0] == true) && (begin_found[1] == true))
                window_found = true;

        /*------------------------------------------------------------------
         * Make sure we found the valid read passing window.  Halt if not
         *-----------------------------------------------------------------*/
        if (window_found == false) {
                printf("ERROR: Cannot determine a common read delay for the "
                       "DIMM(s) installed.\n");
                spd_ddr_init_hang ();
        }

        /*------------------------------------------------------------------
         * Restore the ECC variable to what it originally was
         *-----------------------------------------------------------------*/
        mtsdram(SDRAM_MCOPT1,
                (ppcMfdcr_sdram(SDRAM_MCOPT1) & ~SDRAM_MCOPT1_MCHK_MASK)
                | ecc_temp);
}
#endif /* !HARD_CODED_DQS */
#endif /* !defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION) */

#else /* CONFIG_SPD_EEPROM */

/*-----------------------------------------------------------------------------
 * Function:    initdram
 * Description: Configures the PPC4xx IBM DDR1/DDR2 SDRAM memory controller.
 *              The configuration is performed using static, compile-
 *              time parameters.
 *              Configures the PPC405EX(r) and PPC460EX/GT
 *---------------------------------------------------------------------------*/
phys_size_t initdram(int board_type)
{
        unsigned long val;

#if defined(CONFIG_440)
        mtdcr(SDRAM_R0BAS,      CONFIG_SYS_SDRAM_R0BAS);
        mtdcr(SDRAM_R1BAS,      CONFIG_SYS_SDRAM_R1BAS);
        mtdcr(SDRAM_R2BAS,      CONFIG_SYS_SDRAM_R2BAS);
        mtdcr(SDRAM_R3BAS,      CONFIG_SYS_SDRAM_R3BAS);
        mtdcr(SDRAM_PLBADDULL,  CONFIG_SYS_SDRAM_PLBADDULL);    /* MQ0_BAUL */
        mtdcr(SDRAM_PLBADDUHB,  CONFIG_SYS_SDRAM_PLBADDUHB);    /* MQ0_BAUH */
        mtdcr(SDRAM_CONF1LL,    CONFIG_SYS_SDRAM_CONF1LL);
        mtdcr(SDRAM_CONF1HB,    CONFIG_SYS_SDRAM_CONF1HB);
        mtdcr(SDRAM_CONFPATHB,  CONFIG_SYS_SDRAM_CONFPATHB);
#endif

        /* Set Memory Bank Configuration Registers */

        mtsdram(SDRAM_MB0CF, CONFIG_SYS_SDRAM0_MB0CF);
        mtsdram(SDRAM_MB1CF, CONFIG_SYS_SDRAM0_MB1CF);
        mtsdram(SDRAM_MB2CF, CONFIG_SYS_SDRAM0_MB2CF);
        mtsdram(SDRAM_MB3CF, CONFIG_SYS_SDRAM0_MB3CF);

        /* Set Memory Clock Timing Register */

        mtsdram(SDRAM_CLKTR, CONFIG_SYS_SDRAM0_CLKTR);

        /* Set Refresh Time Register */

        mtsdram(SDRAM_RTR, CONFIG_SYS_SDRAM0_RTR);

        /* Set SDRAM Timing Registers */

        mtsdram(SDRAM_SDTR1, CONFIG_SYS_SDRAM0_SDTR1);
        mtsdram(SDRAM_SDTR2, CONFIG_SYS_SDRAM0_SDTR2);
        mtsdram(SDRAM_SDTR3, CONFIG_SYS_SDRAM0_SDTR3);

        /* Set Mode and Extended Mode Registers */

        mtsdram(SDRAM_MMODE, CONFIG_SYS_SDRAM0_MMODE);
        mtsdram(SDRAM_MEMODE, CONFIG_SYS_SDRAM0_MEMODE);

        /* Set Memory Controller Options 1 Register */

        mtsdram(SDRAM_MCOPT1, CONFIG_SYS_SDRAM0_MCOPT1);

        /* Set Manual Initialization Control Registers */

        mtsdram(SDRAM_INITPLR0, CONFIG_SYS_SDRAM0_INITPLR0);
        mtsdram(SDRAM_INITPLR1, CONFIG_SYS_SDRAM0_INITPLR1);
        mtsdram(SDRAM_INITPLR2, CONFIG_SYS_SDRAM0_INITPLR2);
        mtsdram(SDRAM_INITPLR3, CONFIG_SYS_SDRAM0_INITPLR3);
        mtsdram(SDRAM_INITPLR4, CONFIG_SYS_SDRAM0_INITPLR4);
        mtsdram(SDRAM_INITPLR5, CONFIG_SYS_SDRAM0_INITPLR5);
        mtsdram(SDRAM_INITPLR6, CONFIG_SYS_SDRAM0_INITPLR6);
        mtsdram(SDRAM_INITPLR7, CONFIG_SYS_SDRAM0_INITPLR7);
        mtsdram(SDRAM_INITPLR8, CONFIG_SYS_SDRAM0_INITPLR8);
        mtsdram(SDRAM_INITPLR9, CONFIG_SYS_SDRAM0_INITPLR9);
        mtsdram(SDRAM_INITPLR10, CONFIG_SYS_SDRAM0_INITPLR10);
        mtsdram(SDRAM_INITPLR11, CONFIG_SYS_SDRAM0_INITPLR11);
        mtsdram(SDRAM_INITPLR12, CONFIG_SYS_SDRAM0_INITPLR12);
        mtsdram(SDRAM_INITPLR13, CONFIG_SYS_SDRAM0_INITPLR13);
        mtsdram(SDRAM_INITPLR14, CONFIG_SYS_SDRAM0_INITPLR14);
        mtsdram(SDRAM_INITPLR15, CONFIG_SYS_SDRAM0_INITPLR15);

        /* Set On-Die Termination Registers */

        mtsdram(SDRAM_CODT, CONFIG_SYS_SDRAM0_CODT);
        mtsdram(SDRAM_MODT0, CONFIG_SYS_SDRAM0_MODT0);
        mtsdram(SDRAM_MODT1, CONFIG_SYS_SDRAM0_MODT1);

        /* Set Write Timing Register */

        mtsdram(SDRAM_WRDTR, CONFIG_SYS_SDRAM0_WRDTR);

        /*
         * Start Initialization by SDRAM0_MCOPT2[SREN] = 0 and
         * SDRAM0_MCOPT2[IPTR] = 1
         */

        mtsdram(SDRAM_MCOPT2, (SDRAM_MCOPT2_SREN_EXIT |
                               SDRAM_MCOPT2_IPTR_EXECUTE));

        /*
         * Poll SDRAM0_MCSTAT[MIC] for assertion to indicate the
         * completion of initialization.
         */

        do {
                mfsdram(SDRAM_MCSTAT, val);
        } while ((val & SDRAM_MCSTAT_MIC_MASK) != SDRAM_MCSTAT_MIC_COMP);

        /* Set Delay Control Registers */

        mtsdram(SDRAM_DLCR, CONFIG_SYS_SDRAM0_DLCR);

#if !defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
        mtsdram(SDRAM_RDCC, CONFIG_SYS_SDRAM0_RDCC);
        mtsdram(SDRAM_RQDC, CONFIG_SYS_SDRAM0_RQDC);
        mtsdram(SDRAM_RFDC, CONFIG_SYS_SDRAM0_RFDC);
#endif /* !CONFIG_PPC4xx_DDR_AUTOCALIBRATION */

        /*
         * Enable Controller by SDRAM0_MCOPT2[DCEN] = 1:
         */

        mfsdram(SDRAM_MCOPT2, val);
        mtsdram(SDRAM_MCOPT2, val | SDRAM_MCOPT2_DCEN_ENABLE);

#if defined(CONFIG_440)
        /*
         * Program TLB entries with caches enabled, for best performace
         * while auto-calibrating and ECC generation
         */
        program_tlb(0, 0, (CONFIG_SYS_MBYTES_SDRAM << 20), 0);
#endif

#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
        /*------------------------------------------------------------------
         | DQS calibration.
         +-----------------------------------------------------------------*/
        DQS_autocalibration();
#endif /* CONFIG_PPC4xx_DDR_AUTOCALIBRATION */

        /*
         * Now complete RDSS configuration as mentioned on page 7 of the AMCC
         * PowerPC440SP/SPe DDR2 application note:
         * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
         */
        update_rdcc();

#if defined(CONFIG_DDR_ECC)
        do_program_ecc(0);
#endif /* defined(CONFIG_DDR_ECC) */

#if defined(CONFIG_440)
        /*
         * Now after initialization (auto-calibration and ECC generation)
         * remove the TLB entries with caches enabled and program again with
         * desired cache functionality
         */
        remove_tlb(0, (CONFIG_SYS_MBYTES_SDRAM << 20));
        program_tlb(0, 0, (CONFIG_SYS_MBYTES_SDRAM << 20), MY_TLB_WORD2_I_ENABLE);

#endif

        ppc4xx_ibm_ddr2_register_dump();

#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
        /*
         * Clear potential errors resulting from auto-calibration.
         * If not done, then we could get an interrupt later on when
         * exceptions are enabled.
         */
        set_mcsr(get_mcsr());
#endif /* CONFIG_PPC4xx_DDR_AUTOCALIBRATION */

        return (CONFIG_SYS_MBYTES_SDRAM << 20);
}
#endif /* CONFIG_SPD_EEPROM */

#if defined(CONFIG_440)
u32 mfdcr_any(u32 dcr)
{
        u32 val;

        switch (dcr) {
        case SDRAM_R0BAS + 0:
                val = mfdcr(SDRAM_R0BAS + 0);
                break;
        case SDRAM_R0BAS + 1:
                val = mfdcr(SDRAM_R0BAS + 1);
                break;
        case SDRAM_R0BAS + 2:
                val = mfdcr(SDRAM_R0BAS + 2);
                break;
        case SDRAM_R0BAS + 3:
                val = mfdcr(SDRAM_R0BAS + 3);
                break;
        default:
                printf("DCR %d not defined in case statement!!!\n", dcr);
                val = 0; /* just to satisfy the compiler */
        }

        return val;
}

void mtdcr_any(u32 dcr, u32 val)
{
        switch (dcr) {
        case SDRAM_R0BAS + 0:
                mtdcr(SDRAM_R0BAS + 0, val);
                break;
        case SDRAM_R0BAS + 1:
                mtdcr(SDRAM_R0BAS + 1, val);
                break;
        case SDRAM_R0BAS + 2:
                mtdcr(SDRAM_R0BAS + 2, val);
                break;
        case SDRAM_R0BAS + 3:
                mtdcr(SDRAM_R0BAS + 3, val);
                break;
        default:
                printf("DCR %d not defined in case statement!!!\n", dcr);
        }
}
#endif /* defined(CONFIG_440) */

inline void ppc4xx_ibm_ddr2_register_dump(void)
{
#if defined(DEBUG)
        printf("\nPPC4xx IBM DDR2 Register Dump:\n");

#if (defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
     defined(CONFIG_460EX) || defined(CONFIG_460GT))
        PPC4xx_IBM_DDR2_DUMP_MQ_REGISTER(R0BAS);
        PPC4xx_IBM_DDR2_DUMP_MQ_REGISTER(R1BAS);
        PPC4xx_IBM_DDR2_DUMP_MQ_REGISTER(R2BAS);
        PPC4xx_IBM_DDR2_DUMP_MQ_REGISTER(R3BAS);
#endif /* (defined(CONFIG_440SP) || ... */
#if defined(CONFIG_405EX)
        PPC4xx_IBM_DDR2_DUMP_REGISTER(BESR);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(BEARL);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(BEARH);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(WMIRQ);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(PLBOPT);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(PUABA);
#endif /* defined(CONFIG_405EX) */
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MB0CF);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MB1CF);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MB2CF);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MB3CF);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MCSTAT);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MCOPT1);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MCOPT2);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MODT0);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MODT1);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MODT2);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MODT3);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(CODT);
#if (defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
     defined(CONFIG_460EX) || defined(CONFIG_460GT))
        PPC4xx_IBM_DDR2_DUMP_REGISTER(VVPR);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(OPARS);
        /*
         * OPART is only used as a trigger register.
         *
         * No data is contained in this register, and reading or writing
         * to is can cause bad things to happen (hangs). Just skip it and
         * report "N/A".
         */
        printf("%20s = N/A\n", "SDRAM_OPART");
#endif /* defined(CONFIG_440SP) || ... */
        PPC4xx_IBM_DDR2_DUMP_REGISTER(RTR);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR0);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR1);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR2);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR3);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR4);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR5);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR6);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR7);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR8);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR9);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR10);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR11);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR12);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR13);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR14);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(INITPLR15);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(RQDC);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(RFDC);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(RDCC);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(DLCR);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(CLKTR);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(WRDTR);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(SDTR1);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(SDTR2);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(SDTR3);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MMODE);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(MEMODE);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(ECCES);
#if (defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
     defined(CONFIG_460EX) || defined(CONFIG_460GT))
        PPC4xx_IBM_DDR2_DUMP_REGISTER(CID);
#endif /* defined(CONFIG_440SP) || ... */
        PPC4xx_IBM_DDR2_DUMP_REGISTER(RID);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(FCSR);
        PPC4xx_IBM_DDR2_DUMP_REGISTER(RTSR);
#endif /* defined(DEBUG) */
}