path: root/cfe/cfe/arch/mips/board/bcm63xx_rom/src/bcm6368_sdramDqs.c

/***************************************************************************
*
*  Copyright (c) 2004 Broadcom Corporation, All Rights Reserved.
*  Contains proprietary and confidential information.
*
*  No portions of this material may be reproduced in any form without the
*  written permission of:
*
*        Broadcom Corporation
*        16215 Alton Parkway
*        P.O. Box 57013
*        Irvine, California 92619-7013
*
*  All information contained in this document is Broadcom Corporation
*  company private, proprietary, and trade secret.
*
****************************************************************************/
#include "lib_types.h"
#include "bcm_map.h"

// Uncomment out the below line to use MemoryTestSuite()
// #define EXTENDED_MEMORY_TESTS

/* ---- Private Constants and Types -------------------------------------- */
#define VCDL_PHASE_DEFAULT    16
#define VCDL_PHASE_MAX        47       /* 154.69 degree */
#define VCDL_PHASE_MIN        0        /* 22.5 degree */

typedef unsigned long u;

#define N       32*1024         // Size of the copy operation
                                // Must be at least equal to the L2 cache size
#define S       (1*sizeof(u))

/* ---- Private Function Prototypes -------------------------------------- */
inline static int MemoryTest(void) __attribute__((always_inline));
inline static void PI_upper_set(volatile uint32 *,  int bitOffset, int shift) __attribute__((always_inline));
inline static void PI_shmoo(volatile uint32 *PI_reg, int bitOffset, int minValue, int maxValue, int increment) __attribute__((always_inline));
inline static void shmooVcdl(int minValue, int maxValue, int increment) __attribute__((always_inline));

// #define DEBUG_SHMOO 1
#if DEBUG_SHMOO
inline static void dumpChar(uint8 c) __attribute__((always_inline));
inline static void dumpChar(uint8 c)
{
    //wait till tx fifo below threshold
    while (UART->txf_levl > 14);
    UART->Data = c;
}

#else
#define dumpChar(c)
#endif

#if defined(EXTENDED_MEMORY_TESTS)
#include "memtest.c"/* Suite memory tests SCAN, MARCH, SLIDING, SHIFT ADDRESS */
inline static int MemoryTestSuite(void) __attribute__((always_inline));
#endif

/* ==== Public Functions ================================================= */
void sdramDqsPhaseSet(void);
void vcdlCalibration(void);

/*******************************************************************************/
void sdramDqsPhaseSet(void)
{
    int  dqOutPhaseMax;
    int  delay;
    int  ubusPhase, mipsPhase;
    int  equalCount = 0;

    // Reset VCDL
    DDR->Spare1 |= 0x1;
    delay = 1000;
    while(delay--);
    DDR->Spare1 &= ~0x1;

    // Calculate max phase offset from PLL config register.
    dqOutPhaseMax = ((DDR->MIPSDDRPLLMDiv & DDR_MDIV_MASK) >> DDR_MDIV_SHFT) * 8;

    dumpChar('\n');
    dumpChar('\r');

    // Start by setting VCDL to the default.  This almost always works.
    // Enable squelch
    DDR->WSliceCntl |= (0x1<<20) | (0x1<<4);
    DDR->VCDLPhaseCntl0 = (VCDL_PHASE_DEFAULT << 22) | (VCDL_PHASE_DEFAULT << 16) | (VCDL_PHASE_DEFAULT << 6) | VCDL_PHASE_DEFAULT;
    DDR->VCDLPhaseCntl1 = (VCDL_PHASE_DEFAULT << 22) | (VCDL_PHASE_DEFAULT << 16) | (VCDL_PHASE_DEFAULT << 6) | VCDL_PHASE_DEFAULT;
    DDR->WSliceCntl &= ~((0x1<<20) | (0x1<<4));

    // Now shmoo over DQ phase to find an optimum value.
    dumpChar('D');dumpChar('D');dumpChar('R');dumpChar('2');
    dumpChar('\n');
    dumpChar('\r');
    PI_shmoo(&DDR->DDR1_2PhaseCntl0, 16, -dqOutPhaseMax, dqOutPhaseMax, 1);

    dumpChar('V');dumpChar('C');dumpChar('D');dumpChar('L');
    dumpChar('\n');
    dumpChar('\r');
    shmooVcdl(VCDL_PHASE_MIN, VCDL_PHASE_MAX, 1);

    // Now setup the UBUS clock
    dumpChar('U');dumpChar('B');dumpChar('U');dumpChar('S');
    dumpChar('\n');
    dumpChar('\r');

    MEMC->RefreshPdControl &= ~MEMC_REFRESH_ENABLE;         // Turn off refresh while messing with UBus clock

    DDR->MIPSPhaseCntl &= ~(0x1<<23);                       // turn off ubus PI auto mode

    mipsPhase = DDR->MIPSPhaseCntl;
    do {
        if (DDR->MIPSPhaseCntl == mipsPhase)
            equalCount++;
        else {
            equalCount = 0;
            mipsPhase = DDR->MIPSPhaseCntl;
        }
    } while (equalCount < 3);

    ubusPhase = ((DDR->UBUSPhaseCntl) & 0x3ffe);            // make it even and decrease count
    DDR->UBUSPhaseCntl = ubusPhase;

    // Wait until we match several times in a row, to be sure we wait long enough
    do {
        if (DDR->UBUSPhaseCntl == ubusPhase)
            equalCount++;
        else
            equalCount = 0;
    } while (equalCount < 3);

    MEMC->RefreshPdControl |= MEMC_REFRESH_ENABLE;
}


/* ==== Private Functions ================================================ */

inline static void PI_upper_set(volatile uint32 *PI_reg, int bitOffset, int shift)
{
    uint32  oldVal;
    uint32  newVal;
    int32   oldPhase;
    int32   newPhase;
    int     equalCount = 0;

    oldVal   = *PI_reg;                 // get the phase config (may have other controls in other 16 bits)
    
    oldPhase = ( oldVal >> bitOffset ) & 0x3fff;
    if ( oldPhase & (0x1<<13) ) {
        oldPhase |= ~0x3fff;            // sign extend 
    }

    newPhase = shift & 0x3fff;          // set up phase shift value[13:0]
    if (shift > oldPhase) {             // set up up/down [14], shift is signed value
        newPhase |= 0x1<<14;
    }
    
    newPhase = newPhase << bitOffset;
    oldVal   = oldVal & (0xffff << (16-bitOffset)); // Keep the other control bits
    newVal   = newPhase | oldVal;
    *PI_reg  = newVal;

    // Wait until we match several times in a row, to be sure we wait long enough
    do {
        if (*PI_reg == newVal)
            equalCount++;
        else
            equalCount = 0;
    } while (equalCount < 3);
}


inline static void PI_shmoo(volatile uint32 *PI_reg, int bitOffset, int minValue, int maxValue, int increment)
{
    int piPhase, piPhaseCnt, passStatus;
    int pass1Start, pass1Fail, pass2Start, pass2Fail;
    int pass1Cnt, pass2Cnt;

    PI_upper_set(PI_reg, bitOffset, minValue);

    passStatus = 0;
    pass1Start = maxValue;
    pass1Fail  = minValue;
    pass2Start = minValue;
    pass2Fail  = minValue;

    for (piPhase = minValue; piPhase <= maxValue; piPhase += increment) {
    	
        // if (MemoryTestSuite())
        if (MemoryTest())
        {                   
            if (passStatus == 0x0) {            // first_pass start
                passStatus = 0x1;
                pass1Start = piPhase;
            } 
            else if (passStatus == 0x2) {       // second_pass start
                passStatus = 0x3;
                pass2Start = piPhase;
            } 
            dumpChar('p');
        }
        else {
            if (passStatus == 0x1) {            // fisrt_pass end 
                passStatus = 0x2;
                pass1Fail  = piPhase;          
            }
            else if (passStatus == 0x3) {       // second_pass end
                passStatus = 0x4;
                pass2Fail  = piPhase;          
            }
            dumpChar('.');
        }

        piPhaseCnt = ( piPhase + 0x01) & 0x3fff;
        if (increment) {
            piPhaseCnt |= (0x01<<14);
        }

        *PI_reg = (*PI_reg & (0xffff << (16-bitOffset))) | (piPhaseCnt<<bitOffset);

    }

    // Figure out the middle point of the pass window
    // valid window 1 --  .......PPPPPPPPPPPPPP.......
    // valid window 2 --  PPPPPPP........PPPPPPPPPPPPP

    if ((pass1Start != maxValue) && (pass2Start == minValue)) {     // valid window 1
        if (pass1Fail == minValue) {
            piPhaseCnt  = (pass1Start + maxValue) >> 1;                 // mid-point of the pass window
        } else {
            piPhaseCnt  = (pass1Start + pass1Fail - 0x1) >> 1;                 // mid-point of the pass window
        }
    }
    else if ((pass1Start == minValue) && (pass2Start != minValue) && (pass2Fail == minValue)) { // valid window 2
        pass1Cnt  = pass1Fail - minValue;
        pass2Cnt  = maxValue  - pass2Start + 1;
        passStatus= (pass1Cnt + pass2Cnt) >> 1;
        if (passStatus < pass1Cnt) {                                // mid-point of the overall pass window is in sub-window 1
            piPhaseCnt = minValue + ( pass1Cnt - passStatus );
        } 
        else {
            piPhaseCnt = pass2Start - 0x1 + passStatus;
        }
    } 
    else {
        piPhaseCnt = 0x0;                                           // shmoo failed.
    }

    piPhaseCnt &= ~0x01;                                            // make it even number

    PI_upper_set(PI_reg, bitOffset, piPhaseCnt);                    // set the final phase value

    dumpChar('\n');
    dumpChar('\r');
}


inline static void shmooVcdl(int minValue, int maxValue, int increment)
{
    UINT32              dqsInPhase;
    UINT32              dqsInSum        = 0;
    UINT32              passCnt         = 0;
    volatile int        delay;

    for (dqsInPhase = minValue; dqsInPhase <= maxValue; dqsInPhase += increment) {
        delay = 1000;
        while(delay--);
        // Enable squelch
        DDR->WSliceCntl |= (0x1<<20) | (0x1<<4);
        DDR->VCDLPhaseCntl0 = (dqsInPhase << 22) | (dqsInPhase << 16) | (dqsInPhase << 6) | dqsInPhase;
        DDR->VCDLPhaseCntl1 = (dqsInPhase << 22) | (dqsInPhase << 16) | (dqsInPhase << 6) | dqsInPhase;
        DDR->WSliceCntl &= ~((0x1<<20) | (0x1<<4));

        delay = 1000;
        while(delay--);

#if defined(EXTENDED_MEMORY_TESTS)
        if (MemoryTestSuite() == MEMTEST_SUCCESS )
#else
        if (MemoryTest())
#endif
        {
            dqsInSum += dqsInPhase;
            passCnt++;
            dumpChar('p');
        }
        else {
            dumpChar('.');
        }
    }
    delay = 1000;
    while(delay--);
    // Enable squelch
    DDR->WSliceCntl |= (0x1<<20) | (0x1<<4);
    if (passCnt > 0) {
        dqsInPhase  = dqsInSum / passCnt;
        DDR->VCDLPhaseCntl0 = (dqsInPhase << 22) | (dqsInPhase << 16) | (dqsInPhase << 6) | dqsInPhase;
        DDR->VCDLPhaseCntl1 = (dqsInPhase << 22) | (dqsInPhase << 16) | (dqsInPhase << 6) | dqsInPhase;
    }
    else {
        DDR->VCDLPhaseCntl0 = (VCDL_PHASE_DEFAULT << 22) | (VCDL_PHASE_DEFAULT << 16) | (VCDL_PHASE_DEFAULT << 6) | VCDL_PHASE_DEFAULT;
        DDR->VCDLPhaseCntl1 = (VCDL_PHASE_DEFAULT << 22) | (VCDL_PHASE_DEFAULT << 16) | (VCDL_PHASE_DEFAULT << 6) | VCDL_PHASE_DEFAULT;
    }
    DDR->WSliceCntl &= ~((0x1<<20) | (0x1<<4));
    dumpChar('\n');
    dumpChar('\r');
}

#if defined(EXTENDED_MEMORY_TESTS)

// Define the memory size for use by the memory test suite
#define MEMORY_SIZE     (2 * 1024)

int MemoryTestSuite(void)
{
    int test = 1;
    uint32_t * memory = (uint32_t*) (0xa0000000);
    Pattern_t pat32, patIx;

    for (patIx = PATTERN_0x00000000; patIx < PATTERN_MAX; patIx++ )
    {
        pat32 = pattern[ patIx ];

        fill_memory( memory, MEMORY_SIZE, 0x0 );
        if ( scanWordValue( memory, MEMORY_SIZE, pat32 ) == MEMTEST_FAILURE )
            goto exit_tests;

        test++;

        fill_memory( memory, MEMORY_SIZE, 0x0 );
        if ( scanBulkValue( memory, MEMORY_SIZE, pat32 ) == MEMTEST_FAILURE )
            goto exit_tests;

        test++;

        fill_memory( memory, MEMORY_SIZE, 0x0 );
        if ( scanBulkAltInv( memory, MEMORY_SIZE, pat32 ) == MEMTEST_FAILURE )
            goto exit_tests;

        test++;

        fill_memory( memory, MEMORY_SIZE, 0x0 );
        if ( slidingAltInv( memory, MEMORY_SIZE, pat32 ) == MEMTEST_FAILURE )
            goto exit_tests;

        test++;

        fill_memory( memory, MEMORY_SIZE, 0x0 );
        if ( slidingDiag( memory, MEMORY_SIZE, pat32 ) == MEMTEST_FAILURE )
            goto exit_tests;

        test++;
    }

    fill_memory( memory, MEMORY_SIZE, 0x0 );
    if ( scanWordSelf( memory, MEMORY_SIZE ) == MEMTEST_FAILURE )
        goto exit_tests;

    test++;

    fill_memory( memory, MEMORY_SIZE, 0x0 );
    if ( scanBulkSelf( memory, MEMORY_SIZE ) == MEMTEST_FAILURE )
        goto exit_tests;

    test++;

    fill_alt_memory( memory, MEMORY_SIZE, 0XAAAAAAAA, 0x55555555 );
    if ( memoryBulkCopy( memory, (memory + ((MEMORY_SIZE/2)/sizeof(uint32_t))),
                         MEMORY_SIZE/2 ) == MEMTEST_FAILURE )
        goto exit_tests;

    // return tests;
    return MEMTEST_SUCCESS;

exit_tests:
    return MEMTEST_FAILURE;

}
#endif /* defined(EXTENDED_MEMORY_TESTS) */

//
// Returns: 0=FAILURE, 1=SUCCESS
inline static int MemoryTest(void)
{
    // Test 32-bit write/read
    volatile uint32 *memAddr;
    uint32           memBase;
    uint32           testValue;
    int              i;
    int              j;
    int              k;

    memBase = 0xa0000000;
    for (i = 2; i < 24; i++) {
        memAddr = (void *) (memBase + (1 << i));
        for (k = 0; k < 2; k++) {
            /* walking one */
            testValue = 1;
            for (j = 0; j < 32; j++) {
                *memAddr = testValue;
                if (*memAddr != testValue)
                    return 0;

                testValue <<= 1;
            }
            /* walking zero */
            testValue = ~1;
            for (j = 0; j < 32; j++) {
                *memAddr = testValue;
                if (*memAddr != testValue)
                    return 0;

                testValue = (testValue << 1) | 1;
            }
            /* shift in zeroes */
            testValue = -1;
            for (j = 0; j < 32; j++) {
                *memAddr = testValue;
                *(uint32*)memBase  = 0;
                if (*memAddr != testValue)
                    return 0;

                testValue <<= 1;
            }
            /* shift in ones */
            testValue = 1;
            for (j = 0; j < 32; j++) {
                *memAddr = testValue;
                *(uint32*)memBase  = 0;
                if (*memAddr != testValue)
                    return 0;

                testValue = (testValue << 1) | 1;
            }
        }
    }
    return 1;
}