rt-thread/bsp/thead-smart/drivers/system.c

/*
 * Copyright (C) 2017-2019 Alibaba Group Holding Limited
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2020-08-20     zx.chen      CSI Device System Source File
 */

#include <csi_config.h>
#include <soc.h>
#include <csi_core.h>
#include <drv_irq.h>

#ifndef CONFIG_SYSTICK_HZ
#define CONFIG_SYSTICK_HZ 100
#endif

int g_system_clock = IHS_VALUE;
extern int32_t g_top_irqstack;
extern void irq_vectors_init(void);
extern void mm_heap_initialize(void);

int SystemCoreClock = IHS_VALUE;  /* System Core Clock Frequency      */
extern int __Vectors;

void SystemCoreClockUpdate(void)
{
    SystemCoreClock = IHS_VALUE;
}


static void _system_init_for_kernel(void)
{
    irq_vectors_init();

    csi_coret_config(drv_get_sys_freq() / CONFIG_SYSTICK_HZ, CORET_IRQn);    //10ms
    drv_irq_enable(CORET_IRQn);
}

/**
  * @brief  initialize the system
  *         Initialize the psr and vbr.
  * @param  None
  * @return None
  */
void SystemInit(void)
{
    int i;
    /* enable mstatus FS */
#if ((CONFIG_CPU_E906F==1) || (CONFIG_CPU_E906FD==1))
    uint32_t mstatus = __get_MSTATUS();
    mstatus |= (1 << 13);
    __set_MSTATUS(mstatus);
#endif

    /* enable mxstatus THEADISAEE */
    uint32_t mxstatus = __get_MXSTATUS();
    mxstatus |= (1 << 22);
    /* enable mxstatus MM */
#if ((CONFIG_CPU_E906==1) || (CONFIG_CPU_E906F==1) || (CONFIG_CPU_E906FD==1))
    mxstatus |= (1 << 15);
#endif
    __set_MXSTATUS(mxstatus);


    /* get interrupt level from info */
    CLIC->CLICCFG = (((CLIC->CLICINFO & CLIC_INFO_CLICINTCTLBITS_Msk) >> CLIC_INFO_CLICINTCTLBITS_Pos) << CLIC_CLICCFG_NLBIT_Pos);

    for (i = 0; i < 64; i++) 
    {
        CLIC->CLICINT[i].IP = 0;
        CLIC->CLICINT[i].ATTR = 1; /* use vector interrupt */
    }

    /* tspend use positive interrupt */
    CLIC->CLICINT[Machine_Software_IRQn].ATTR = 0x3;

    csi_dcache_enable();
    csi_icache_enable();
    drv_irq_enable(Machine_Software_IRQn);

    _system_init_for_kernel();
}