drivers/emc/fsl_emc.c

/*
 * Copyright (c) 2016, Freescale Semiconductor, Inc.
 * Copyright 2016-2019 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include "fsl_emc.h"

/*******************************************************************************
 * Definitions
 ******************************************************************************/

/* Component ID definition, used by tools. */
#ifndef FSL_COMPONENT_ID
#define FSL_COMPONENT_ID "platform.drivers.emc"
#endif

/*! @brief Define macros for EMC driver. */
#define EMC_REFRESH_CLOCK_PARAM       (16U)
#define EMC_SDRAM_WAIT_CYCLES         (2000U)
#define EMC_DYNCTL_COLUMNBASE_OFFSET  (0U)
#define EMC_DYNCTL_COLUMNBASE_MASK    (0x3U)
#define EMC_DYNCTL_COLUMNPLUS_OFFSET  (3U)
#define EMC_DYNCTL_COLUMNPLUS_MASK    (0x18U)
#define EMC_DYNCTL_BUSWIDTH_MASK      (0x80U)
#define EMC_DYNCTL_BUSADDRMAP_MASK    (0x20U)
#define EMC_DYNCTL_DEVBANKS_BITS_MASK (0x1cU)
#define EMC_SDRAM_BANKCS_BA0_MASK     (uint32_t)(0x2000)
#define EMC_SDRAM_BANKCS_BA1_MASK     (uint32_t)(0x4000)
#define EMC_SDRAM_BANKCS_BA_MASK      (EMC_SDRAM_BANKCS_BA0_MASK | EMC_SDRAM_BANKCS_BA1_MASK)
#define EMC_DIV_ROUND_UP(n, m)        (((n) + (m)-1U) / (m))

/*******************************************************************************
 * Prototypes
 ******************************************************************************/
/*!
 * @brief Get instance number for EMC module.
 *
 * @param base EMC peripheral base address
 */
static uint32_t EMC_GetInstance(EMC_Type *base);

/*!
 * @brief Get the clock cycles of EMC clock.
 * The function is used to calculate the multiple of the
 * 16 EMCCLKs between the timer_Ns period.
 *
 * @param base EMC peripheral base address
 * @param timer_Ns The timer/period in unit of nanosecond
 * @param plus The plus added to the register settings to reach the calculated cycles.
 * @return The calculated cycles.
 */
static uint32_t EMC_CalculateTimerCycles(EMC_Type *base, uint32_t timer_Ns, uint32_t plus);

/*!
 * @brief Get the shift value to shift the mode register content by.
 *
 * @param addrMap EMC address map for the dynamic memory configuration.
 *                It is the bit 14 ~ bit 7 of the EMC_DYNAMICCONFIG.
 * @return The offset value to shift the mode register content by.
 */
static uint32_t EMC_ModeOffset(uint32_t addrMap);

/*******************************************************************************
 * Variables
 ******************************************************************************/

#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
/*! @brief Pointers to EMC clocks for each instance. */
static const clock_ip_name_t s_EMCClock[FSL_FEATURE_SOC_EMC_COUNT] = EMC_CLOCKS;
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */

#if !(defined(FSL_FEATURE_EMC_HAS_NO_RESET) && FSL_FEATURE_EMC_HAS_NO_RESET)
/*! @brief Pointers to EMC resets for each instance. */
static const reset_ip_name_t s_emcResets[] = EMC_RSTS;
#endif

/*! @brief Pointers to EMC bases for each instance. */
static const EMC_Type *const s_EMCBases[] = EMC_BASE_PTRS;

/*! @brief Define the start address for each chip controlled by EMC. */
static const uint32_t s_EMCDYCSBases[] = EMC_DYCS_ADDRESS;
/*******************************************************************************
 * Code
 ******************************************************************************/

static uint32_t EMC_GetInstance(EMC_Type *base)
{
    uint32_t instance;

    /* Find the instance index from base address mappings. */
    for (instance = 0; instance < ARRAY_SIZE(s_EMCBases); instance++)
    {
        if (s_EMCBases[instance] == base)
        {
            break;
        }
    }

    assert(instance < ARRAY_SIZE(s_EMCBases));

    return instance;
}

static uint32_t EMC_CalculateTimerCycles(EMC_Type *base, uint32_t timer_Ns, uint32_t plus)
{
    uint32_t cycles;

    cycles = CLOCK_GetEmcClkFreq() / EMC_HZ_ONEMHZ * timer_Ns;
    cycles = EMC_DIV_ROUND_UP(cycles, EMC_MILLISECS_ONESEC); /* Round up. */

    /* Decrese according to the plus. */
    if (cycles >= plus)
    {
        cycles = cycles - plus;
    }
    else
    {
        cycles = 0;
    }

    return cycles;
}

static uint32_t EMC_ModeOffset(uint32_t addrMap)
{
    uint8_t offset     = 0;
    uint32_t columbase = addrMap & EMC_DYNCTL_COLUMNBASE_MASK;

    /* First calculate the column length. */
    if (columbase == 2U)
    {
        offset = 8;
    }
    else
    {
        if (0U == columbase)
        {
            offset = 9;
        }
        else
        {
            offset = 8;
        }

        /* Add column length increase check. */
        offset += (uint8_t)((addrMap & EMC_DYNCTL_COLUMNPLUS_MASK) >> EMC_DYNCTL_COLUMNPLUS_OFFSET);
    }

    /* Add Buswidth/16. */
    if (0U != (addrMap & EMC_DYNCTL_BUSWIDTH_MASK))
    {
        offset += 2U;
    }
    else
    {
        offset += 1U;
    }

    /* Add bank select bit if the sdram address map mode is RBC(row-bank-column) mode. */
    if (0U == (addrMap & EMC_DYNCTL_BUSADDRMAP_MASK))
    {
        if (0U == (addrMap & EMC_DYNCTL_DEVBANKS_BITS_MASK))
        {
            offset += 1U;
        }
        else
        {
            offset += 2U;
        }
    }

    return offset;
}

/*!
 * brief Initializes the basic for EMC.
 * This function ungates the EMC clock, initializes the emc system configure
 * and enable the EMC module. This function must be called in the first step to initialize
 * the external memory.
 *
 * param base EMC peripheral base address.
 * param config The EMC basic configuration.
 */
void EMC_Init(EMC_Type *base, emc_basic_config_t *config)
{
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
    /* Enable the clock. */
    CLOCK_EnableClock((s_EMCClock[EMC_GetInstance(base)]));
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */

#if !(defined(FSL_FEATURE_EMC_HAS_NO_RESET) && FSL_FEATURE_EMC_HAS_NO_RESET)
    /* Reset the EMC module */
    RESET_PeripheralReset(s_emcResets[EMC_GetInstance(base)]);
#endif

    /* Reset the EMC. */
    SYSCON->PRESETCTRL[2] |= SYSCON_PRESETCTRL_EMC_RESET_MASK;
    SYSCON->PRESETCTRL[2] &= ~SYSCON_PRESETCTRL_EMC_RESET_MASK;

    /* Set the EMC sytem configure. */
    SYSCON->EMCCLKDIV = SYSCON_EMCCLKDIV_DIV(config->emcClkDiv);

    SYSCON->EMCSYSCTRL = SYSCON_EMCSYSCTRL_EMCFBCLKINSEL(config->fbClkSrc);

    /* Set the endian mode. */
    base->CONFIG = (uint32_t)config->endian;
    /* Enable the EMC module with normal memory map mode and normal work mode. */
    base->CONTROL = EMC_CONTROL_E_MASK;
}

/*!
 * brief Initializes the dynamic memory controller.
 * This function initializes the dynamic memory controller in external memory controller.
 * This function must be called after EMC_Init and before accessing the external dynamic memory.
 *
 * param base EMC peripheral base address.
 * param timing The timing and latency for dynamica memory controller setting. It shall
 *        be used for all dynamica memory chips, threfore the worst timing value for all
 *        used chips must be given.
 * param configure The EMC dynamic memory controller chip independent configuration pointer.
 *       This configuration pointer is actually pointer to a configration array. the array number
 *       depends on the "totalChips".
 * param totalChips The total dynamic memory chip numbers been used or the length of the
 *        "emc_dynamic_chip_config_t" type memory.
 */
void EMC_DynamicMemInit(EMC_Type *base,
                        emc_dynamic_timing_config_t *timing,
                        emc_dynamic_chip_config_t *config,
                        uint32_t totalChips)
{
    assert(NULL != config);
    assert(NULL != timing);
    assert(totalChips <= EMC_DYNAMIC_MEMDEV_NUM);

    uint32_t count;
    uint32_t casLatency;
    uint32_t addr;
    uint32_t offset;
    uint32_t data;
    emc_dynamic_chip_config_t *dynamicConfig = config;

    /* Setting for dynamic memory controller chip independent configuration. */
    for (count = 0; (count < totalChips); count++)
    {
        if (NULL == dynamicConfig)
        {
            break;
        }
        else
        {
            base->DYNAMIC[dynamicConfig->chipIndex].DYNAMICCONFIG =
                EMC_DYNAMIC_DYNAMICCONFIG_MD(dynamicConfig->dynamicDevice) | EMC_ADDRMAP(dynamicConfig->devAddrMap);
            /* Abstract CAS latency from the sdram mode reigster setting values. */
            casLatency = ((uint32_t)dynamicConfig->sdramModeReg & EMC_SDRAM_MODE_CL_MASK) >> EMC_SDRAM_MODE_CL_SHIFT;
            base->DYNAMIC[dynamicConfig->chipIndex].DYNAMICRASCAS =
                EMC_DYNAMIC_DYNAMICRASCAS_RAS(dynamicConfig->rAS_Nclk) | EMC_DYNAMIC_DYNAMICRASCAS_CAS(casLatency);

            dynamicConfig++;
        }
    }

    /* Configure the Dynamic Memory controller timing/latency for all chips. */
    base->DYNAMICREADCONFIG = EMC_DYNAMICREADCONFIG_RD(timing->readConfig);
    base->DYNAMICRP         = EMC_CalculateTimerCycles(base, timing->tRp_Ns, 1) & EMC_DYNAMICRP_TRP_MASK;
    base->DYNAMICRAS        = EMC_CalculateTimerCycles(base, timing->tRas_Ns, 1) & EMC_DYNAMICRAS_TRAS_MASK;
    base->DYNAMICSREX       = EMC_CalculateTimerCycles(base, timing->tSrex_Ns, 1) & EMC_DYNAMICSREX_TSREX_MASK;
    base->DYNAMICAPR        = EMC_CalculateTimerCycles(base, timing->tApr_Ns, 1) & EMC_DYNAMICAPR_TAPR_MASK;
    base->DYNAMICDAL        = EMC_CalculateTimerCycles(base, timing->tDal_Ns, 0) & EMC_DYNAMICDAL_TDAL_MASK;
    base->DYNAMICWR         = EMC_CalculateTimerCycles(base, timing->tWr_Ns, 1) & EMC_DYNAMICWR_TWR_MASK;
    base->DYNAMICRC         = EMC_CalculateTimerCycles(base, timing->tRc_Ns, 1) & EMC_DYNAMICRC_TRC_MASK;
    base->DYNAMICRFC        = EMC_CalculateTimerCycles(base, timing->tRfc_Ns, 1) & EMC_DYNAMICRFC_TRFC_MASK;
    base->DYNAMICXSR        = EMC_CalculateTimerCycles(base, timing->tXsr_Ns, 1) & EMC_DYNAMICXSR_TXSR_MASK;
    base->DYNAMICRRD        = EMC_CalculateTimerCycles(base, timing->tRrd_Ns, 1) & EMC_DYNAMICRRD_TRRD_MASK;
    base->DYNAMICMRD        = EMC_DYNAMICMRD_TMRD((timing->tMrd_Nclk > 0U) ? timing->tMrd_Nclk - 1UL : 0UL);

    SDK_DelayAtLeastUs(EMC_SDRAM_NOP_DELAY_US, SDK_DEVICE_MAXIMUM_CPU_CLOCK_FREQUENCY);
    /* Step 2. issue nop command. */
    base->DYNAMICCONTROL = 0x00000183;

    SDK_DelayAtLeastUs(EMC_SDRAM_PRECHARGE_DELAY_US, SDK_DEVICE_MAXIMUM_CPU_CLOCK_FREQUENCY);
    /* Step 3. issue precharge all command. */
    base->DYNAMICCONTROL = 0x00000103;

    /* Step 4. issue two auto-refresh command. */
    base->DYNAMICREFRESH = 2;
    SDK_DelayAtLeastUs(EMC_SDRAM_AUTO_REFRESH_DELAY_US, SDK_DEVICE_MAXIMUM_CPU_CLOCK_FREQUENCY);

    base->DYNAMICREFRESH = EMC_CalculateTimerCycles(base, timing->refreshPeriod_Nanosec, 0) / EMC_REFRESH_CLOCK_PARAM;

    /* Step 5. issue a mode command and set the mode value. */
    base->DYNAMICCONTROL = 0x00000083;

    /* Calculate the mode settings here and to reach the 8 auto-refresh time requirement. */
    dynamicConfig = config;
    for (count = 0; (count < totalChips); count++)
    {
        if (NULL == dynamicConfig)
        {
            break;
        }
        else
        {
            /* Get the shift value first. */
            offset = EMC_ModeOffset(dynamicConfig->devAddrMap);
            addr   = (s_EMCDYCSBases[dynamicConfig->chipIndex] |
                    ((uint32_t)(dynamicConfig->sdramModeReg & ~EMC_SDRAM_BANKCS_BA_MASK) << offset));
            /* Set the right mode setting value. */
            data = *(volatile uint32_t *)addr;
            data = data;
            dynamicConfig++;
        }
    }

    if (kEMC_Sdram != config->dynamicDevice)
    {
        /* Add extended mode register if the low-power sdram is used. */
        base->DYNAMICCONTROL = 0x00000083;
        /* Calculate the mode settings for extended mode register. */
        dynamicConfig = config;
        for (count = 0; (count < totalChips); count++)
        {
            if (NULL == dynamicConfig)
            {
                break;
            }
            else
            {
                /* Get the shift value first. */
                offset = EMC_ModeOffset(dynamicConfig->devAddrMap);
                addr   = (s_EMCDYCSBases[dynamicConfig->chipIndex] |
                        (((uint32_t)(dynamicConfig->sdramExtModeReg & ~EMC_SDRAM_BANKCS_BA_MASK) |
                          EMC_SDRAM_BANKCS_BA1_MASK)
                         << offset));
                /* Set the right mode setting value. */
                data = *(volatile uint32_t *)addr;
                data = data;
                dynamicConfig++;
            }
        }
    }

    /* Step 6. issue normal operation command. */
    base->DYNAMICCONTROL = 0x00000000; /* Issue NORMAL command */

    /* The buffer shall be disabled when do the sdram initialization and
     * enabled after the initialization during normal opeation.
     */
    dynamicConfig = config;
    for (count = 0; (count < totalChips); count++)
    {
        if (NULL == dynamicConfig)
        {
            break;
        }
        else
        {
            base->DYNAMIC[dynamicConfig->chipIndex].DYNAMICCONFIG |= EMC_DYNAMIC_DYNAMICCONFIG_B_MASK;
            dynamicConfig++;
        }
    }
}

/*!
 * brief Initializes the static memory controller.
 * This function initializes the static memory controller in external memory controller.
 * This function must be called after EMC_Init and before accessing the external static memory.
 *
 * param base EMC peripheral base address.
 * param extWait_Ns The extended wait timeout or the read/write transfer time.
 *        This is common for all static memory chips and set with NULL if not required.
 * param configure The EMC static memory controller chip independent configuration pointer.
 *       This configuration pointer is actually pointer to a configration array. the array number
 *       depends on the "totalChips".
 * param totalChips The total static memory chip numbers been used or the length of the
 *        "emc_static_chip_config_t" type memory.
 */
void EMC_StaticMemInit(EMC_Type *base, uint32_t *extWait_Ns, emc_static_chip_config_t *config, uint32_t totalChips)
{
    assert(NULL != config);

    uint32_t count;
    emc_static_chip_config_t *staticConfig = config;

    /* Initialize extended wait. */
    if (NULL != extWait_Ns)
    {
        for (count = 0; (count < totalChips) && (staticConfig != NULL); count++)
        {
            assert(0U != (staticConfig->specailConfig & (uint32_t)kEMC_AsynchronosPageEnable));
        }

        base->STATICEXTENDEDWAIT = EMC_CalculateTimerCycles(base, *extWait_Ns, 1);
        staticConfig++;
    }

    /* Initialize the static memory chip specific configure. */
    staticConfig = config;
    for (count = 0; (count < totalChips); count++)
    {
        if (NULL == staticConfig)
        {
            break;
        }
        else
        {
            base->STATIC[staticConfig->chipIndex].STATICCONFIG =
                (staticConfig->specailConfig | (uint32_t)staticConfig->memWidth);
            base->STATIC[staticConfig->chipIndex].STATICWAITWEN =
                EMC_CalculateTimerCycles(base, staticConfig->tWaitWriteEn_Ns, 1);
            base->STATIC[staticConfig->chipIndex].STATICWAITOEN =
                EMC_CalculateTimerCycles(base, staticConfig->tWaitOutEn_Ns, 0);
            base->STATIC[staticConfig->chipIndex].STATICWAITRD =
                EMC_CalculateTimerCycles(base, staticConfig->tWaitReadNoPage_Ns, 1);
            base->STATIC[staticConfig->chipIndex].STATICWAITPAGE =
                EMC_CalculateTimerCycles(base, staticConfig->tWaitReadPage_Ns, 1);
            base->STATIC[staticConfig->chipIndex].STATICWAITWR =
                EMC_CalculateTimerCycles(base, staticConfig->tWaitWrite_Ns, 2);
            base->STATIC[staticConfig->chipIndex].STATICWAITTURN =
                EMC_CalculateTimerCycles(base, staticConfig->tWaitTurn_Ns, 1);

            staticConfig++;
        }
    }
}

/*!
 * brief Deinitializes the EMC module and gates the clock.
 * This function gates the EMC controller clock. As a result, the EMC
 * module doesn't work after calling this function.
 *
 * param base EMC peripheral base address.
 */
void EMC_Deinit(EMC_Type *base)
{
    /* Deinit the EMC. */
    base->CONTROL &= ~EMC_CONTROL_E_MASK;

#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
    /* Disable the clock. */
    CLOCK_DisableClock(s_EMCClock[EMC_GetInstance(base)]);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
}