rt-thread-official/libcpu/arm/sep4020/clk.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2010-03-20     zchong      first version
 */

#include <rtthread.h>
#include "sep4020.h"

#define CLK_IN          4000000     /* Fin = 4.00MHz  */
#define SYSCLK          72000000    /* system clock we want */

#define CLK_ESRAM       0
#define CLK_LCDC        1
#define CLK_PWM         2
#define CLK_DMAC        3
#define CLK_EMI         4
#define CLK_MMCSD       5
#define CLK_SSI         7
#define CLK_UART0       8
#define CLK_UART1       9
#define CLK_UART2       10
#define CLK_UART3       11
#define CLK_USB         12
#define CLK_MAC         13
#define CLK_SMC         14
#define CLK_I2C         15
#define CLK_GPT         16

static void rt_hw_set_system_clock(void)
{
    rt_uint8_t pv;

    /* pv value*/
    pv  = SYSCLK/2/CLK_IN;
    /* go to normal mode*/
    *(RP)PMU_PMDR = 0x01;
    /* set the clock */
    *(RP)PMU_PMCR = 0x4000 | pv;
    /* trige configurate*/
    *(RP)PMU_PMCR = 0xc000 | pv;
}

static void rt_hw_set_usb_clock(void)
{
    /* set the clock */
    *(RP)PMU_PUCR = 0x000c;
    /* trige configurate*/
    *(RP)PMU_PMCR = 0x800c;

}

/**
 * @brief System Clock Configuration
 */
void rt_hw_clock_init(void)
{
    /* set system clock */
    rt_hw_set_system_clock();
    /* set usb clock */
    rt_hw_set_usb_clock();
}

/**
 * @brief Get system clock
 */
rt_uint32_t rt_hw_get_clock(void)
{
    rt_uint32_t val;
    rt_uint8_t pv, pd, npd;

    /* get PMCR value */
    val =*(RP) PMU_PMCR;
    /* get NPD */
    npd = (val >> 14) & 0x01;
    /* get PD  */
    pd  = (val >> 10) & 0x0f;
    /* get PV  */
    pv  = val & 0x7f;
    /* caculate the system clock */
    if(npd)
        val = 2 * CLK_IN * pv;
    else
        val = CLK_IN * pv / (pd + 1);

    return(val);
}

/**
 * @brief Enable module clock
 */
 void rt_hw_enable_module_clock(rt_uint8_t module)
 {

 }

/**
 * @brief Disable module clock
 */
  void rt_hw_disable_module_clock(rt_uint8_t module)
 {

 }