| /* |
| * Copyright (c) 2017, NXP |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <kernel.h> |
| #include <device.h> |
| #include <init.h> |
| #include <soc.h> |
| #include <linker/sections.h> |
| #include <fsl_common.h> |
| #include <fsl_clock.h> |
| #include <arch/cpu.h> |
| |
| #define LPSCI0SRC_MCGFLLCLK (1) |
| |
| /******************************************************************************* |
| * Variables |
| ******************************************************************************/ |
| |
| /* |
| * KL25Z Flash configuration fields |
| * These 16 bytes, which must be loaded to address 0x400, include default |
| * protection and security settings. |
| * They are loaded at reset to various Flash Memory module (FTFE) registers. |
| * |
| * The structure is: |
| * -Backdoor Comparison Key for unsecuring the MCU - 8 bytes |
| * -Program flash protection bytes, 4 bytes, written to FPROT0-3 |
| * -Flash security byte, 1 byte, written to FSEC |
| * -Flash nonvolatile option byte, 1 byte, written to FOPT |
| * -Reserved, 1 byte, (Data flash protection byte for FlexNVM) |
| * -Reserved, 1 byte, (EEPROM protection byte for FlexNVM) |
| * |
| */ |
| u8_t __kinetis_flash_config_section __kinetis_flash_config[] = { |
| /* Backdoor Comparison Key (unused) */ |
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, |
| /* Program flash protection; 1 bit/region - 0=protected, 1=unprotected |
| */ |
| 0xFF, 0xFF, 0xFF, 0xFF, |
| /* |
| * Flash security: Backdoor key disabled, Mass erase enabled, |
| * Factory access enabled, MCU is unsecure |
| */ |
| 0xFE, |
| /* Flash nonvolatile option: NMI enabled, EzPort enabled, Normal boot */ |
| 0xFF, |
| /* Reserved for FlexNVM feature (unsupported by this MCU) */ |
| 0xFF, 0xFF}; |
| |
| static ALWAYS_INLINE void clkInit(void) |
| { |
| /* |
| * Core clock: 48MHz |
| * Bus clock: 24MHz |
| */ |
| const mcg_pll_config_t pll0Config = { |
| .enableMode = 0U, .prdiv = CONFIG_MCG_PRDIV0, .vdiv = CONFIG_MCG_VDIV0, |
| }; |
| const sim_clock_config_t simConfig = { |
| .pllFllSel = 1U, /* PLLFLLSEL select PLL. */ |
| .er32kSrc = 3U, /* ERCLK32K selection, use LPO. */ |
| .clkdiv1 = 0x10010000U, /* SIM_CLKDIV1. */ |
| }; |
| |
| const osc_config_t oscConfig = {.freq = CONFIG_OSC_XTAL0_FREQ, |
| .capLoad = 0, |
| #if defined(CONFIG_OSC_EXTERNAL) |
| .workMode = kOSC_ModeExt, |
| #elif defined(CONFIG_OSC_LOW_POWER) |
| .workMode = kOSC_ModeOscLowPower, |
| #elif defined(CONFIG_OSC_HIGH_GAIN) |
| .workMode = kOSC_ModeOscHighGain, |
| #else |
| #error "An oscillator mode must be defined" |
| #endif |
| .oscerConfig = { |
| .enableMode = kOSC_ErClkEnable, |
| #if (defined(FSL_FEATURE_OSC_HAS_EXT_REF_CLOCK_DIVIDER) && \ |
| FSL_FEATURE_OSC_HAS_EXT_REF_CLOCK_DIVIDER) |
| .erclkDiv = 0U, |
| #endif |
| } }; |
| |
| CLOCK_SetSimSafeDivs(); |
| CLOCK_InitOsc0(&oscConfig); |
| |
| /* Passing the XTAL0 frequency to clock driver. */ |
| CLOCK_SetXtal0Freq(CONFIG_OSC_XTAL0_FREQ); |
| |
| CLOCK_BootToPeeMode(kMCG_OscselOsc, kMCG_PllClkSelPll0, &pll0Config); |
| |
| CLOCK_SetInternalRefClkConfig(kMCG_IrclkEnable, kMCG_IrcSlow, 0); |
| CLOCK_SetSimConfig(&simConfig); |
| |
| #ifdef CONFIG_UART_MCUX_LPSCI_0 |
| CLOCK_SetLpsci0Clock(LPSCI0SRC_MCGFLLCLK); |
| #endif |
| #if CONFIG_USB_KINETIS |
| CLOCK_EnableUsbfs0Clock(kCLOCK_UsbSrcPll0, |
| CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC); |
| #endif |
| } |
| |
| static int kl2x_init(struct device *arg) |
| { |
| ARG_UNUSED(arg); |
| |
| unsigned int oldLevel; /* old interrupt lock level */ |
| |
| /* disable interrupts */ |
| oldLevel = irq_lock(); |
| |
| /* Disable the watchdog */ |
| SIM->COPC = 0; |
| |
| /* Initialize system clock to 48 MHz */ |
| clkInit(); |
| |
| /* |
| * install default handler that simply resets the CPU |
| * if configured in the kernel, NOP otherwise |
| */ |
| NMI_INIT(); |
| |
| /* restore interrupt state */ |
| irq_unlock(oldLevel); |
| return 0; |
| } |
| |
| SYS_INIT(kl2x_init, PRE_KERNEL_1, 0); |