hardware_init_K22F512.c

/*
 * Copyright (c) 2013-2015, Freescale Semiconductor, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * o Redistributions of source code must retain the above copyright notice, this list
 *   of conditions and the following disclaimer.
 *
 * o Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 *
 * o Neither the name of Freescale Semiconductor, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "bootloader_common.h"
#include "bootloader/bl_context.h"
#include "fsl_device_registers.h"
#include "uart/fsl_uart.h"
#include "utilities/kinetis_family.h"
#include "smc/smc.h"

////////////////////////////////////////////////////////////////////////////////
// Definitions
////////////////////////////////////////////////////////////////////////////////

#ifdef TOWER
#define BOOT_PIN_NUMBER 7
#define BOOT_PIN_PORT PORTC
#define BOOT_PIN_GPIO GPIOC
#define BOOT_PIN_ALT_MODE 1
#endif

#ifdef FREEDOM
#define BOOT_PIN_NUMBER 17
#define BOOT_PIN_PORT PORTB
#define BOOT_PIN_GPIO GPIOB
#define BOOT_PIN_ALT_MODE 1
#endif

#define BOOT_PIN_DEBOUNCE_READ_COUNT 500

////////////////////////////////////////////////////////////////////////////////
// Variables
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
// Code
////////////////////////////////////////////////////////////////////////////////

void init_hardware(void)
{
    exit_vlpr();

    // Enable all the ports
    SIM->SCGC5 |= (SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK | SIM_SCGC5_PORTC_MASK | SIM_SCGC5_PORTD_MASK |
                   SIM_SCGC5_PORTE_MASK);

    SIM->SOPT2 |= SIM_SOPT2_PLLFLLSEL_MASK; // set PLLFLLSEL to select the IRC48M for this clock source
}

void deinit_hardware(void)
{
    SIM->SCGC5 &= (uint32_t) ~(SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK | SIM_SCGC5_PORTC_MASK |
                               SIM_SCGC5_PORTD_MASK | SIM_SCGC5_PORTE_MASK);

    // Restore SIM_SOPTx related bits being changed
    SIM->SOPT2 &= (uint32_t) ~(SIM_SOPT2_USBSRC_MASK | SIM_SOPT2_PLLFLLSEL_MASK);
}

// Note: Keep this function here to ensure compatibility, all usb related clock
// configuration is maintained by USB stack itself.
bool usb_clock_init(void)
{
    // Enable USB-OTG IP clocking
    SIM->SCGC4 |= (SIM_SCGC4_USBOTG_MASK);

    // If clock of usb module cannot be enabled, return false
    if (!(SIM->SCGC4 & SIM_SCGC4_USBOTG_MASK))
    {
        return false;
    }

    // Reset the USB peripheral, this must be done here instead of USB driver due to silicon errata
    // for at least KL25 and K22
    USB0->USBTRC0 |= USB_USBTRC0_USBRESET_MASK;
    while (USB0->USBTRC0 & USB_USBTRC0_USBRESET_MASK)
        ;

    // Select IRC48M clock, SIM_SOPT2_USBSRC_MASK selects internal clock,
    // 0x30000 = SIM_SOPT2_PLLFLLSEL_MASK, selects IRC48MHz clock
    SIM->SOPT2 |= (SIM_SOPT2_USBSRC_MASK | SIM_SOPT2_PLLFLLSEL_MASK);

    // need to set the clock_recover_en and irc_en register
    USB0->CLK_RECOVER_CTRL |= USB_CLK_RECOVER_CTRL_CLOCK_RECOVER_EN_MASK;
    USB0->CLK_RECOVER_IRC_EN |= USB_CLK_RECOVER_IRC_EN_IRC_EN_MASK;

    return true;
}

uint32_t get_bus_clock(void)
{
    uint32_t busClockDivider = ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV2_MASK) >> SIM_CLKDIV1_OUTDIV2_SHIFT) + 1;
    return (SystemCoreClock / busClockDivider);
}

uint32_t get_uart_clock(uint32_t instance)
{
    switch (instance)
    {
        case 0:
        case 1:
            // UART0 and UART1 always use the system clock
            return SystemCoreClock;
        case 2:
        case 3:
        case 4:
        case 5:
        default:
            return 0;
    }
}

bool is_boot_pin_asserted(void)
{
    return false;
#ifdef BL_TARGET_FLASH
    // Initialize boot pin for GPIO
    BOOT_PIN_PORT->PCR[BOOT_PIN_NUMBER] |= PORT_PCR_MUX(BOOT_PIN_ALT_MODE);

    // Set boot pin as an input
    BOOT_PIN_GPIO->PDDR &= (uint32_t) ~(1 << BOOT_PIN_NUMBER);
    // Set boot pin pullup enabled, pullup select, filter enable
    BOOT_PIN_PORT->PCR[BOOT_PIN_NUMBER] |= (PORT_PCR_PE_MASK | PORT_PCR_PS_MASK | PORT_PCR_PFE_MASK);

    uint32_t readCount = 0;

    // Sample the pin a number of times
    for (uint32_t i = 0; i < BOOT_PIN_DEBOUNCE_READ_COUNT; i++)
    {
        readCount += ((BOOT_PIN_GPIO->PDIR) >> BOOT_PIN_NUMBER) & 1;
    }

    // boot pin is pulled high so we are measuring lows, make sure most of our measurements
    // registered as low
    return (readCount < (BOOT_PIN_DEBOUNCE_READ_COUNT / 2));
#else
    // Boot pin for Flash only target
    return false;
#endif
}

void debug_init(void)
{
}

#if __ICCARM__

size_t __write(int handle, const unsigned char *buf, size_t size)
{
    return size;
}

#endif // __ICCARM__

void update_available_peripherals()
{
}

////////////////////////////////////////////////////////////////////////////////
// EOF
////////////////////////////////////////////////////////////////////////////////