/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019
 *    William D. Jones (thor0505@comcast.net),
 *    Ha Thach (tinyusb.org)
 *    Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * This file is part of the TinyUSB stack.
 */

/* metadata:
   manufacturer: STMicroelectronics
*/

// Suppress warning caused by mcu driver
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-align"
#endif

#include "stm32n6xx_hal.h"

#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif

#include "bsp/board_api.h"

TU_ATTR_UNUSED static void Error_Handler(void) { }

void HardFault_Handler(void);
static void MPU_Config(void);
static void SystemIsolation_Config(void);
typedef struct {
  GPIO_TypeDef* port;
  GPIO_InitTypeDef pin_init;
  uint8_t active_state;
} board_pindef_t;

#include "board.h"

#ifdef UART_ID
  #if UART_ID == 1
    #define USARTn            USART1
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART1_CLK_ENABLE
  #elif UART_ID == 2
    #define USARTn            USART2
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART2_CLK_ENABLE
  #elif UART_ID == 3
    #define USARTn            USART3
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART3_CLK_ENABLE
  #endif
#endif

//--------------------------------------------------------------------+
// MACRO TYPEDEF CONSTANT ENUM
//--------------------------------------------------------------------+

#ifdef UART_ID
static UART_HandleTypeDef UartHandle = {
  .Instance = USARTn,
  .Init = {
    .BaudRate = CFG_BOARD_UART_BAUDRATE,
    .WordLength = UART_WORDLENGTH_8B,
    .StopBits = UART_STOPBITS_1,
    .Parity = UART_PARITY_NONE,
    .HwFlowCtl = UART_HWCONTROL_NONE,
    .Mode = UART_MODE_TX_RX,
    .OverSampling = UART_OVERSAMPLING_16,
  }
};
#endif

#ifndef SWO_FREQ
#define SWO_FREQ  4000000
#endif

//--------------------------------------------------------------------+
// Forward USB interrupt events to TinyUSB IRQ Handler
//--------------------------------------------------------------------+

// Despite being call USB2_OTG_FS on some MCUs
// OTG_FS is marked as RHPort0 by TinyUSB to be consistent across stm32 port
void USB2_OTG_HS_IRQHandler(void) {
  tusb_int_handler(1, true);
}

// Despite being call USB1_OTG_HS on some MCUs
// OTG_HS is marked as RHPort1 by TinyUSB to be consistent across stm32 port
void USB1_OTG_HS_IRQHandler(void) {
  tusb_int_handler(0, true);
}

#ifdef TRACE_ETM
static void trace_etm_init(void) {
  // Nucleo-N657X0-Q routes 4-bit trace to the CN1 MIPI20 natively:
  // TRACE_CLK = PB3, D0 = PE3, D1 = PB0, D2 = PB6, D3 = PB7 (MB1940 Table 5)
  GPIO_InitTypeDef gpio_init;
  gpio_init.Mode      = GPIO_MODE_AF_PP;
  gpio_init.Pull      = GPIO_NOPULL;
  gpio_init.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
  gpio_init.Alternate = GPIO_AF0_TRACE;
  gpio_init.Pin = GPIO_PIN_0 | GPIO_PIN_3 | GPIO_PIN_6 | GPIO_PIN_7;
  HAL_GPIO_Init(GPIOB, &gpio_init);
  gpio_init.Pin = GPIO_PIN_3;
  HAL_GPIO_Init(GPIOE, &gpio_init);

  // trace clock (ck_cpu_tpiu) is a fixed cpu/8 - just enable it
  DBGMCU->CR |= DBGMCU_CR_DBGCLKEN | DBGMCU_CR_TRACECLKEN;
}
#else
  #define trace_etm_init()
#endif

void board_init(void) {
  /* Enable BusFault and SecureFault handlers (HardFault is default) */
  SCB->SHCSR |= (SCB_SHCSR_BUSFAULTENA_Msk | SCB_SHCSR_SECUREFAULTENA_Msk);

  MPU_Config();
  SystemIsolation_Config();

  SCB_EnableICache();
  SCB_EnableDCache();

  HAL_PWREx_EnableVddA();
  HAL_PWREx_EnableVddIO2();
  HAL_PWREx_EnableVddIO3();
  HAL_PWREx_EnableVddIO4();
  HAL_PWREx_EnableVddIO5();

  HAL_Init();

  // Implemented in board.h
  SystemClock_Config();

  // Enable All GPIOs clocks
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOE_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPION_CLK_ENABLE();
  __HAL_RCC_GPIOO_CLK_ENABLE();
  __HAL_RCC_GPIOP_CLK_ENABLE();
  __HAL_RCC_GPIOQ_CLK_ENABLE();

  for (uint8_t i = 0; i < TU_ARRAY_SIZE(board_pindef); i++) {
    HAL_GPIO_Init(board_pindef[i].port, &board_pindef[i].pin_init);
  }
  trace_etm_init();

  NVIC_SetPriority(UCPD1_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),5, 0));
  NVIC_EnableIRQ(UCPD1_IRQn);

#if CFG_TUSB_OS == OPT_OS_NONE
  // 1ms tick timer
  SysTick_Config(SystemCoreClock / 1000);

#elif CFG_TUSB_OS == OPT_OS_FREERTOS
  // Explicitly disable systick to prevent its ISR from running before scheduler start
  SysTick->CTRL &= ~1U;

  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )

  NVIC_SetPriority(USB1_OTG_HS_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
#endif



#ifdef UART_ID
  UARTn_CLK_ENABLE();
  HAL_UART_Init(&UartHandle);
  HAL_UARTEx_EnableFifoMode(&UartHandle);
#endif

#if (CFG_TUD_ENABLED && BOARD_TUD_RHPORT == 0) || (CFG_TUH_ENABLED && BOARD_TUH_RHPORT == 0)
  __HAL_RCC_USB1_OTG_HS_CLK_ENABLE();
  __HAL_RCC_PWR_CLK_ENABLE();
  HAL_PWREx_EnableVddUSBVMEN();
  while(__HAL_PWR_GET_FLAG(PWR_FLAG_USB33RDY));
  HAL_PWREx_EnableVddUSB();

  LL_AHB5_GRP1_ForceReset(0x00800000);
  __HAL_RCC_USB1_OTG_HS_FORCE_RESET();
  __HAL_RCC_USB1_OTG_HS_PHY_FORCE_RESET();

  LL_RCC_HSE_SelectHSEDiv2AsDiv2Clock();
  LL_AHB5_GRP1_ReleaseReset(0x00800000);

  /* Peripheral clock enable */
  __HAL_RCC_USB1_OTG_HS_CLK_ENABLE();

  /* Required few clock cycles before accessing USB PHY Controller Registers */
  for (volatile uint32_t i = 0; i < 10; i++) {
      __NOP(); // No Operation instruction to create a delay
  }

  USB1_HS_PHYC->USBPHYC_CR &= ~(0x7 << 0x4);

  USB1_HS_PHYC->USBPHYC_CR |= (0x1 << 16) |
                              (0x2 << 4)  |
                              (0x1 << 2)  |
                                0x1U;

  __HAL_RCC_USB1_OTG_HS_PHY_RELEASE_RESET();

  /* Required few clock cycles before Releasing Reset */
  for (volatile uint32_t i = 0; i < 10; i++) {
      __NOP(); // No Operation instruction to create a delay
  }

  __HAL_RCC_USB1_OTG_HS_RELEASE_RESET();

  /* Peripheral PHY clock enable */
  __HAL_RCC_USB1_OTG_HS_PHY_CLK_ENABLE();

#if CFG_TUH_ENABLED && BOARD_TUH_RHPORT == 0
  board_vbus_set(BOARD_TUH_RHPORT, 1);
#endif
#endif

#if (CFG_TUD_ENABLED && BOARD_TUD_RHPORT == 1) || (CFG_TUH_ENABLED && BOARD_TUH_RHPORT == 1)
  __HAL_RCC_USB2_OTG_HS_CLK_ENABLE();
  __HAL_RCC_PWR_CLK_ENABLE();
  HAL_PWREx_EnableVddUSBVMEN();
  while(__HAL_PWR_GET_FLAG(PWR_FLAG_USB33RDY));
  HAL_PWREx_EnableVddUSB();

  LL_AHB5_GRP1_ForceReset(0x00800000);
  __HAL_RCC_USB2_OTG_HS_FORCE_RESET();
  __HAL_RCC_USB2_OTG_HS_PHY_FORCE_RESET();

  LL_RCC_HSE_SelectHSEDiv2AsDiv2Clock();
  LL_AHB5_GRP1_ReleaseReset(0x00800000);

  /* Peripheral clock enable */
  __HAL_RCC_USB2_OTG_HS_CLK_ENABLE();

  /* Required few clock cycles before accessing USB PHY Controller Registers */
  for (volatile uint32_t i = 0; i < 10; i++) {
      __NOP(); // No Operation instruction to create a delay
  }

  USB2_HS_PHYC->USBPHYC_CR &= ~(0x7 << 0x4);

  USB2_HS_PHYC->USBPHYC_CR |= (0x1 << 16) |
                              (0x2 << 4)  |
                              (0x1 << 2)  |
                                0x1U;

  __HAL_RCC_USB2_OTG_HS_PHY_RELEASE_RESET();

  /* Required few clock cycles before Releasing Reset */
  for (volatile uint32_t i = 0; i < 10; i++) {
      __NOP(); // No Operation instruction to create a delay
  }

  __HAL_RCC_USB2_OTG_HS_RELEASE_RESET();

  /* Peripheral PHY clock enable */
  __HAL_RCC_USB2_OTG_HS_PHY_CLK_ENABLE();

#if CFG_TUH_ENABLED && BOARD_TUH_RHPORT == 1
  board_vbus_set(BOARD_TUH_RHPORT, 1);
#endif
#endif

  board_init2();
}

static void MPU_Config(void)
{
  MPU_Region_InitTypeDef default_config = {0};
  MPU_Attributes_InitTypeDef attr_config = {0};
  uint32_t primask_bit = __get_PRIMASK();
  __disable_irq();

  /* disable the MPU */
  HAL_MPU_Disable();

  /* create an attribute configuration for the MPU */
  attr_config.Attributes = INNER_OUTER(MPU_NOT_CACHEABLE);
  attr_config.Number = MPU_ATTRIBUTES_NUMBER0;

  HAL_MPU_ConfigMemoryAttributes(&attr_config);

  /* Create a non cacheable region */
  /*Normal memory type, code execution allowed */
  default_config.Enable = MPU_REGION_ENABLE;
  default_config.Number = MPU_REGION_NUMBER0;
  default_config.BaseAddress = __NON_CACHEABLE_SECTION_BEGIN;
  default_config.LimitAddress =  __NON_CACHEABLE_SECTION_END;
  default_config.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
  default_config.AccessPermission = MPU_REGION_ALL_RW;
  default_config.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
  default_config.AttributesIndex = MPU_ATTRIBUTES_NUMBER0;
  HAL_MPU_ConfigRegion(&default_config);

  /* enable the MPU */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);

  /* Exit critical section to lock the system and avoid any issue around MPU mechanisme */
  __set_PRIMASK(primask_bit);
}

static void SystemIsolation_Config(void) {
  /* set all required IPs as secure privileged */
  __HAL_RCC_RIFSC_CLK_ENABLE();
  RIMC_MasterConfig_t RIMC_master = {0};
  RIMC_master.MasterCID = RIF_CID_1;
  RIMC_master.SecPriv = RIF_ATTRIBUTE_SEC | RIF_ATTRIBUTE_PRIV;

  /*RIMC configuration*/
  HAL_RIF_RIMC_ConfigMasterAttributes(RIF_MASTER_INDEX_OTG1, &RIMC_master);
  HAL_RIF_RIMC_ConfigMasterAttributes(RIF_MASTER_INDEX_OTG2, &RIMC_master);

  /*RISUP configuration*/
  HAL_RIF_RISC_SetSlaveSecureAttributes(RIF_RISC_PERIPH_INDEX_OTG1HS , RIF_ATTRIBUTE_SEC | RIF_ATTRIBUTE_PRIV);
  HAL_RIF_RISC_SetSlaveSecureAttributes(RIF_RISC_PERIPH_INDEX_OTG2HS , RIF_ATTRIBUTE_SEC | RIF_ATTRIBUTE_PRIV);
}

//--------------------------------------------------------------------+
// Board porting API
//--------------------------------------------------------------------+

void board_led_write(bool state) {
#ifdef PINID_LED
  board_pindef_t* pindef = &board_pindef[PINID_LED];
  GPIO_PinState pin_state = state == pindef->active_state ? GPIO_PIN_SET : GPIO_PIN_RESET;
  HAL_GPIO_WritePin(pindef->port, pindef->pin_init.Pin, pin_state);
#else
  (void) state;
#endif
}

uint32_t board_button_read(void) {
#ifdef PINID_BUTTON
  board_pindef_t* pindef = &board_pindef[PINID_BUTTON];
  return pindef->active_state == HAL_GPIO_ReadPin(pindef->port, pindef->pin_init.Pin);
#else
  return 0;
#endif
}

size_t board_get_unique_id(uint8_t id[], size_t max_len) {
  (void) max_len;
  volatile uint32_t * stm32_uuid = (volatile uint32_t *) UID_BASE;
  uint32_t* id32 = (uint32_t*) (uintptr_t) id;
  uint8_t const len = 12;

  id32[0] = stm32_uuid[0];
  id32[1] = stm32_uuid[1];
  id32[2] = stm32_uuid[2];

  return len;
}

int board_uart_read(uint8_t *buf, int len) {
#ifdef UART_ID
  int count = 0;
  while (count < len) {
    if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_RXNE)) {
      buf[count] = (uint8_t) UartHandle.Instance->RDR;
      count++;
    } else {
      break;
    }
  }
  return count;
#else
  (void) buf; (void) len;
  return 0;
#endif
}

int board_uart_write(void const *buf, int len) {
#ifdef UART_ID
  const uint8_t *p = (const uint8_t *) buf;
  int count = 0;
  while (count < len) {
    if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_TXE)) {
      UartHandle.Instance->TDR = p[count];
      count++;
    } else {
      break;
    }
  }
  return count;
#else
  (void) buf; (void) len;
  return -1;
#endif
}

#if CFG_TUSB_OS == OPT_OS_NONE
volatile uint32_t system_ticks = 0;

void SysTick_Handler(void) {
  HAL_IncTick();
  system_ticks++;
}

uint32_t tusb_time_millis_api(void) {
  return system_ticks;
}

#endif

void HardFault_Handler(void) {
  __asm("BKPT #0\n");
}

// Required by __libc_init_array in startup code if we are compiling using
// -nostdlib/-nostartfiles.
void _init(void) {
}
