rt-thread-official/bsp/imxrt/libraries/drivers/drv_sdram.c

/*
 * Copyright 2017 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <rtthread.h>
#ifdef BSP_USING_SDRAM

#include "sdram_port.h"
#include "board.h"
#include "fsl_semc.h"
#include "drv_sdram.h"

#define DRV_DEBUG
#define LOG_TAG             "drv.sdram"
#include <drv_log.h>

#ifdef RT_USING_MEMHEAP_AS_HEAP
static struct rt_memheap system_heap;
#endif

int rt_hw_sdram_Init(void)
{
    int result = RT_EOK;
    semc_config_t config;
    semc_sdram_config_t sdramconfig;
    rt_uint32_t clockFrq = CLOCK_GetFreq(kCLOCK_SemcClk);

    /* Initializes the MAC configure structure to zero. */
    memset(&config, 0, sizeof(semc_config_t));
    memset(&sdramconfig, 0, sizeof(semc_sdram_config_t));
     
    /* Initialize SEMC. */
    SEMC_GetDefaultConfig(&config);
    config.dqsMode = kSEMC_Loopbackdqspad;  /* For more accurate timing. */
    SEMC_Init(SEMC, &config);

    /* Configure SDRAM. */
    sdramconfig.csxPinMux               = SDRAM_CS_PIN;
    sdramconfig.address                 = SDRAM_BANK_ADDR;
    sdramconfig.memsize_kbytes          = SDRAM_SIZE;
    sdramconfig.portSize                = SDRAM_DATA_WIDTH;
    sdramconfig.burstLen                = kSEMC_Sdram_BurstLen8;
    sdramconfig.columnAddrBitNum        = SDRAM_COLUMN_BITS;
    sdramconfig.casLatency              = SDRAM_CAS_LATENCY;
    sdramconfig.tPrecharge2Act_Ns       = SDRAM_TRP;
    sdramconfig.tAct2ReadWrite_Ns       = SDRAM_TRCD;
    sdramconfig.tRefreshRecovery_Ns     = SDRAM_REFRESH_RECOVERY;
    sdramconfig.tWriteRecovery_Ns       = SDRAM_TWR;
    sdramconfig.tCkeOff_Ns              = 42;  /* The minimum cycle of SDRAM CLK off state. CKE is off in self refresh at a minimum period tRAS.*/
    sdramconfig.tAct2Prechage_Ns        = SDRAM_TRAS;
    sdramconfig.tSelfRefRecovery_Ns     = 67;
    sdramconfig.tRefresh2Refresh_Ns     = SDRAM_TRC;
    sdramconfig.tAct2Act_Ns             = SDRAM_ACT2ACT;
    sdramconfig.tPrescalePeriod_Ns      = 160 * (1000000000 / clockFrq);
    sdramconfig.refreshPeriod_nsPerRow  = SDRAM_REFRESH_ROW;
    sdramconfig.refreshUrgThreshold     = sdramconfig.refreshPeriod_nsPerRow;
    sdramconfig.refreshBurstLen         = 1;
    result = SEMC_ConfigureSDRAM(SEMC, SDRAM_REGION, &sdramconfig, clockFrq);
    if(result != kStatus_Success)
    {
        LOG_E("SDRAM init failed!");
        result = -RT_ERROR;
    }
    else
    {
        LOG_D("sdram init success, mapped at 0x%X, size is %d Kbytes.", SDRAM_BANK_ADDR, SDRAM_SIZE);
#ifdef RT_USING_MEMHEAP_AS_HEAP
	/*
	 * If RT_USING_MEMHEAP_AS_HEAP is enabled, SDRAM is initialized to the heap.
	 * The heap start address is (base + half size), and the size is (half size - 2M).
	 * The reasons are:
	 * 		1. Reserve the half space for SDRAM link case
	 *		2. Reserve the 2M for non-cache space
	 */
        rt_memheap_init(&system_heap, "sdram", (void *)(SDRAM_BANK_ADDR + (SDRAM_SIZE * 1024)/2),
			(SDRAM_SIZE * 1024)/2 - (2 * 1024 * 1024));
#endif
    }
    
    return result;
}
INIT_BOARD_EXPORT(rt_hw_sdram_Init);

#ifdef DRV_DEBUG
#ifdef FINSH_USING_MSH

#define SEMC_DATALEN                (0x1000U)
rt_uint32_t sdram_writeBuffer[SEMC_DATALEN];
rt_uint32_t sdram_readBuffer[SEMC_DATALEN];

/* read write 32bit test */
void sdram_test(void)
{
    rt_uint32_t index;
    rt_uint32_t datalen = SEMC_DATALEN;
    rt_uint32_t *sdram = (rt_uint32_t *)SDRAM_BANK_ADDR; /* SDRAM start address. */
    bool result = true;

    LOG_D("\r\n SEMC SDRAM Memory 32 bit Write Start, Start Address 0x%x, Data Length %d !\r\n", sdram, datalen);
    /* Prepare data and write to SDRAM. */
    for (index = 0; index < datalen; index++)
    {
        sdram_writeBuffer[index] = index;
        sdram[index] = sdram_writeBuffer[index];
    }

    LOG_D("\r\n SEMC SDRAM Read 32 bit Data Start, Start Address 0x%x, Data Length %d !\r\n", sdram, datalen);
    /* Read data from the SDRAM. */
    for (index = 0; index < datalen; index++)
    {
        sdram_readBuffer[index] = sdram[index];
    }

    LOG_D("\r\n SEMC SDRAM 32 bit Data Write and Read Compare Start!\r\n");
    /* Compare the two buffers. */
    while (datalen--)
    {
        if (sdram_writeBuffer[datalen] != sdram_readBuffer[datalen])
        {
            result = false;
            break;
        }
    }

    if (!result)
    {
        LOG_E("\r\n SEMC SDRAM 32 bit Data Write and Read Compare Failed!\r\n");
    }
    else
    {
        LOG_D("\r\n SEMC SDRAM 32 bit Data Write and Read Compare Succeed!\r\n");
    }
}
MSH_CMD_EXPORT(sdram_test, sdram test)

#endif /* DRV_DEBUG */
#endif /* FINSH_USING_MSH */
#endif /* BSP_USING_SDRAM */