boards/evkmimx8mq/driver_examples/uart/polling/board.c

/*
 * Copyright 2017-2018 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include "fsl_common.h"
#include "fsl_debug_console.h"
#include "board.h"
#include "fsl_rdc.h"
#include "fsl_iomuxc.h"
#include "pin_mux.h"
#include "fsl_clock.h"

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

/*******************************************************************************
 * Code
 ******************************************************************************/
/* Initialize debug console. */
void BOARD_InitDebugConsole(void)
{
    uint32_t uartClkSrcFreq = BOARD_DEBUG_UART_CLK_FREQ;
    CLOCK_EnableClock(kCLOCK_Uart2);
    DbgConsole_Init(BOARD_DEBUG_UART_INSTANCE, BOARD_DEBUG_UART_BAUDRATE, BOARD_DEBUG_UART_TYPE, uartClkSrcFreq);
}
/* Initialize MPU, configure non-cacheable memory */
void BOARD_InitMemory(void)
{
#if defined(__CC_ARM) || defined(__ARMCC_VERSION)
    extern uint32_t Load$$LR$$LR_cache_region$$Base[];
    extern uint32_t Image$$ARM_LIB_STACK$$ZI$$Limit[];
    uint32_t cacheStart = (uint32_t)Load$$LR$$LR_cache_region$$Base;
    uint32_t size       = (cacheStart < 0x20000000U) ? (0) : ((uint32_t)Image$$ARM_LIB_STACK$$ZI$$Limit - cacheStart);
#else
    extern uint32_t __CACHE_REGION_START[];
    extern uint32_t __CACHE_REGION_SIZE[];
    uint32_t cacheStart = (uint32_t)__CACHE_REGION_START;
    uint32_t size       = (uint32_t)__CACHE_REGION_SIZE;
#endif
    uint32_t i = 0;
    /* Make sure outstanding transfers are done. */
    __DMB();
    /* Disable the MPU. */
    MPU->CTRL = 0;

    /*
     *  The ARMv7-M default address map define the address space 0x20000000 to 0x3FFFFFFF as SRAM with Normal type, but
     *  there the address space 0x28000000 ~ 0x3FFFFFFF has been physically mapped to smart subsystems, so there need
     *  change the default memory attributes.
     *  Since the base address of MPU region should be multiples of region size, to make it simple, the MPU region 0 set
     *  the all 512M of SRAM space with device attributes, then disable subregion 0 and 1 (address space 0x20000000 ~
     *  0x27FFFFFF) to use the
     *  background memory attributes.
     */

    /* Select Region 0 and set its base address to the M4 code bus start address. */
    MPU->RBAR = (0x20000000U & MPU_RBAR_ADDR_Msk) | MPU_RBAR_VALID_Msk | (0 << MPU_RBAR_REGION_Pos);

    /* Region 0 setting:
     * 1) Disable Instruction Access;
     * 2) AP = 011b, full access;
     * 3) Non-shared device;
     * 4) Region Not Shared;
     * 5) Sub-Region 0,1 Disabled;
     * 6) MPU Protection Region size = 512M byte;
     * 7) Enable Region 0.
     */
    MPU->RASR = (0x1 << MPU_RASR_XN_Pos) | (0x3 << MPU_RASR_AP_Pos) | (0x2 << MPU_RASR_TEX_Pos) |
                (0x3 << MPU_RASR_SRD_Pos) | (28 << MPU_RASR_SIZE_Pos) | MPU_RASR_ENABLE_Msk;

    /*
     *  Non-cacheable area is provided in DDR memory, the DDR region 2MB - 128MB totally 126MB is revserved for CM4
     *  cores. You can put global or static uninitialized variables in NonCacheable section(initialized variables in
     *  NonCacheable.init section) to make them uncacheable. Since the base address of MPU region should be multiples of
     * region size,
     *  to make it simple, the MPU region 1 & 2 set all DDR address space 0x40000000 ~ 0xBFFFFFFF to be non-cacheable).
     *  Then MPU region 3 set the text and data section to be cacheable if the program running on DDR.
     *  The cacheable area base address should be multiples of its size in linker file, they can be modified per your
     * needs.
     */

    /* Select Region 1 and set its base address to the DDR start address. */
    MPU->RBAR = (0x40000000U & MPU_RBAR_ADDR_Msk) | MPU_RBAR_VALID_Msk | (1 << MPU_RBAR_REGION_Pos);

    /* Region 1 setting:
     * 1) Enable Instruction Access;
     * 2) AP = 011b, full access;
     * 3) Shared Device;
     * 4) MPU Protection Region size = 1024M byte;
     * 5) Enable Region 1.
     */
    MPU->RASR = (0x3 << MPU_RASR_AP_Pos) | (0x1 << MPU_RASR_B_Pos) | (29 << MPU_RASR_SIZE_Pos) | MPU_RASR_ENABLE_Msk;

    /* Select Region 2 and set its base address to the DDR start address. */
    MPU->RBAR = (0x80000000U & MPU_RBAR_ADDR_Msk) | MPU_RBAR_VALID_Msk | (2 << MPU_RBAR_REGION_Pos);

    /* Region 2 setting:
     * 1) Enable Instruction Access;
     * 2) AP = 011b, full access;
     * 3) Shared Device;
     * 4) MPU Protection Region size = 1024M byte;
     * 5) Enable Region 2.
     */
    MPU->RASR = (0x3 << MPU_RASR_AP_Pos) | (0x1 << MPU_RASR_B_Pos) | (29 << MPU_RASR_SIZE_Pos) | MPU_RASR_ENABLE_Msk;

    while ((size >> i) > 0x1U)
    {
        i++;
    }

    /* If run on DDR, configure text and data section to be cacheable */
    if (i != 0)
    {
        /* The MPU region size should be 2^N, 5<=N<=32, region base should be multiples of size. */
        assert((size & (size - 1)) == 0);
        assert(!(cacheStart % size));
        assert(size == (uint32_t)(1 << i));
        assert(i >= 5);

        /* Select Region 3 and set its base address to the cache able region start address. */
        MPU->RBAR = (cacheStart & MPU_RBAR_ADDR_Msk) | MPU_RBAR_VALID_Msk | (3 << MPU_RBAR_REGION_Pos);

        /* Region 3 setting:
         * 1) Enable Instruction Access;
         * 2) AP = 011b, full access;
         * 3) Outer and inner Cacheable, write and read allocate;
         * 4) Region Not Shared;
         * 5) All Sub-Region Enabled;
         * 6) MPU Protection Region size get from linker file;
         * 7) Enable Region 3.
         */
        MPU->RASR = (0x3 << MPU_RASR_AP_Pos) | (0x1 << MPU_RASR_TEX_Pos) | (0x1 << MPU_RASR_C_Pos) |
                    (0x1 << MPU_RASR_B_Pos) | ((i - 1) << MPU_RASR_SIZE_Pos) | MPU_RASR_ENABLE_Msk;
    }

    /* Enable Privileged default memory map and the MPU. */
    MPU->CTRL = MPU_CTRL_ENABLE_Msk | MPU_CTRL_PRIVDEFENA_Msk;
    /* Memory barriers to ensure subsequence data & instruction
     * transfers using updated MPU settings.
     */
    __DSB();
    __ISB();
}

void BOARD_RdcInit(void)
{
    /* Move M4 core to specific RDC domain 1 */
    rdc_domain_assignment_t assignment = {0};

    assignment.domainId = BOARD_DOMAIN_ID;
    RDC_SetMasterDomainAssignment(RDC, kRDC_Master_M4, &assignment);
    /*
     * The M4 core is running at domain 1, now enable the clock gate of the following IP/BUS/PLL in domain 1 in the CCM.
     * In this way, to ensure the clock of the peripherals used by M core not be affected by A core which is running at
     * domain 0.
     */
    CLOCK_EnableClock(kCLOCK_Iomux);

    CLOCK_EnableClock(kCLOCK_Ipmux1);
    CLOCK_EnableClock(kCLOCK_Ipmux2);
    CLOCK_EnableClock(kCLOCK_Ipmux3);
    CLOCK_EnableClock(kCLOCK_Ipmux4);

    CLOCK_ControlGate(kCLOCK_SysPll1Gate, kCLOCK_ClockNeededAll);   /* Enable the CCGR gate for SysPLL1 in Domain 1 */
    CLOCK_ControlGate(kCLOCK_SysPll2Gate, kCLOCK_ClockNeededAll);   /* Enable the CCGR gate for SysPLL2 in Domain 1 */
    CLOCK_ControlGate(kCLOCK_SysPll3Gate, kCLOCK_ClockNeededAll);   /* Enable the CCGR gate for SysPLL3 in Domain 1 */
    CLOCK_ControlGate(kCLOCK_AudioPll1Gate, kCLOCK_ClockNeededAll); /* Enable the CCGR gate for AudioPLL1 in Domain 1 */
    CLOCK_ControlGate(kCLOCK_AudioPll2Gate, kCLOCK_ClockNeededAll); /* Enable the CCGR gate for AudioPLL2 in Domain 1 */
    CLOCK_ControlGate(kCLOCK_VideoPll1Gate, kCLOCK_ClockNeededAll); /* Enable the CCGR gate for VideoPLL1 in Domain 1 */
}