/*
 * Copyright (c) 2006-2023, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author            Notes
 * 2021-09-23     charlown           first version
 */

#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>

#ifdef BSP_USING_PWM

#define LOG_TAG "drv.pwm"
#include <drv_log.h>

#ifndef ITEM_NUM
#define ITEM_NUM(items) sizeof(items) / sizeof(items[0])
#endif

#define MAX_COUNTER 65535
#define MIN_COUNTER 2
#define MIN_PULSE 2

struct rtdevice_pwm_device
{
  struct rt_device_pwm parent;
  TIM_TypeDef *periph;
  rt_uint8_t channel[4];
  char *name;
};

/*
* channel = 0xFF: the channel is not use.
*/
struct rtdevice_pwm_device pwm_device_list[] =
    {
#ifdef BSP_USING_TIM1_PWM
        {
            .periph = TIM1,
            .name = "pwm1",
#ifdef BSP_USING_TIM1_PWM_CH1
            .channel[0] = TIM_Channel_1,
#else
            .channel[0] = 0xFF,
#endif

#ifdef BSP_USING_TIM1_PWM_CH2
            .channel[1] = TIM_Channel_2,
#else
            .channel[1] = 0xFF,
#endif

#ifdef BSP_USING_TIM1_PWM_CH3
            .channel[2] = TIM_Channel_3,
#else
            .channel[2] = 0xFF,
#endif

#ifdef BSP_USING_TIM1_PWM_CH4
            .channel[3] = TIM_Channel_4,
#else
            .channel[3] = 0xFF,
#endif
        },
#endif

#ifdef BSP_USING_TIM2_PWM
        {
            .periph = TIM2,
            .name = "pwm2",
#ifdef BSP_USING_TIM2_PWM_CH1
            .channel[0] = TIM_Channel_1,
#else
            .channel[0] = 0xFF,
#endif

#ifdef BSP_USING_TIM2_PWM_CH2
            .channel[1] = TIM_Channel_2,
#else
            .channel[1] = 0xFF,
#endif

#ifdef BSP_USING_TIM2_PWM_CH3
            .channel[2] = TIM_Channel_3,
#else
            .channel[2] = 0xFF,
#endif

#ifdef BSP_USING_TIM2_PWM_CH4
            .channel[3] = TIM_Channel_4,
#else
            .channel[3] = 0xFF,
#endif
        },
#endif

#ifdef BSP_USING_TIM3_PWM
        {
            .periph = TIM3,
            .name = "pwm3",
#ifdef BSP_USING_TIM3_PWM_CH1
            .channel[0] = TIM_Channel_1,
#else
            .channel[0] = 0xFF,
#endif

#ifdef BSP_USING_TIM3_PWM_CH2
            .channel[1] = TIM_Channel_2,
#else
            .channel[1] = 0xFF,
#endif

#ifdef BSP_USING_TIM3_PWM_CH3
            .channel[2] = TIM_Channel_3,
#else
            .channel[2] = 0xFF,
#endif

#ifdef BSP_USING_TIM3_PWM_CH4
            .channel[3] = TIM_Channel_4,
#else
            .channel[3] = 0xFF,
#endif
        },
#endif

#ifdef BSP_USING_TIM4_PWM
        {
            .periph = TIM4,
            .name = "pwm4",
#ifdef BSP_USING_TIM4_PWM_CH1
            .channel[0] = TIM_Channel_1,
#else
            .channel[0] = 0xFF,
#endif

#ifdef BSP_USING_TIM4_PWM_CH2
            .channel[1] = TIM_Channel_2,
#else
            .channel[1] = 0xFF,
#endif

#ifdef BSP_USING_TIM4_PWM_CH3
            .channel[2] = TIM_Channel_3,
#else
            .channel[2] = 0xFF,
#endif

#ifdef BSP_USING_TIM4_PWM_CH4
            .channel[3] = TIM_Channel_4,
#else
            .channel[3] = 0xFF,
#endif
        },
#endif
};

static rt_err_t ch32f1_pwm_device_enable(struct rt_device_pwm *device, struct rt_pwm_configuration *configuration, rt_bool_t enable)
{
  struct rtdevice_pwm_device *pwm_device;
  rt_uint32_t channel_index;
  rt_uint16_t ccx_state;

  pwm_device = (struct rtdevice_pwm_device *)device;
  channel_index = configuration->channel;

  if (enable == RT_TRUE)
  {
    ccx_state = TIM_CCx_Enable;
  }
  else
  {
    ccx_state = TIM_CCx_Disable;
  }

  if (channel_index <= 4 && channel_index > 0)
  {
    if (pwm_device->channel[channel_index - 1] == 0xFF)
      return -RT_EINVAL;

    TIM_CCxCmd(pwm_device->periph, pwm_device->channel[channel_index - 1], ccx_state);
  }
  else
  {
    return -RT_EINVAL;
  }

  TIM_Cmd(pwm_device->periph, ENABLE);

  return RT_EOK;
}

static rt_err_t ch32f1_pwm_device_get(struct rt_device_pwm *device, struct rt_pwm_configuration *configuration)
{
  struct rtdevice_pwm_device *pwm_device;
  rt_uint32_t arr_counter, ccr_counter, prescaler, sample_freq;
  rt_uint32_t channel_index;
  rt_uint32_t tim_clock;

  pwm_device = (struct rtdevice_pwm_device *)device;

  tim_clock = ch32f1_tim_clock_get(pwm_device->periph);
  channel_index = configuration->channel;
  arr_counter = pwm_device->periph->ATRLR + 1;
  prescaler = pwm_device->periph->PSC + 1;

  sample_freq = (tim_clock / prescaler) / arr_counter;

  /* unit:ns */
  configuration->period = 1000000000 / sample_freq;

  if (channel_index == 1)
  {
    ccr_counter = pwm_device->periph->CH1CVR + 1;
    configuration->pulse = ((ccr_counter * 100) / arr_counter) * configuration->period / 100;
  }
  else if (channel_index == 2)
  {
    ccr_counter = pwm_device->periph->CH2CVR + 1;
    configuration->pulse = ((ccr_counter * 100) / arr_counter) * configuration->period / 100;
  }
  else if (channel_index == 3)
  {
    ccr_counter = pwm_device->periph->CH3CVR + 1;
    configuration->pulse = ((ccr_counter * 100) / arr_counter) * configuration->period / 100;
  }
  else if (channel_index == 4)
  {
    ccr_counter = pwm_device->periph->CH4CVR + 1;
    configuration->pulse = ((ccr_counter * 100) / arr_counter) * configuration->period / 100;
  }
  else
    return -RT_EINVAL;

  return RT_EOK;
}

static rt_err_t ch32f1_pwm_device_set(struct rt_device_pwm *device, struct rt_pwm_configuration *configuration)
{
  struct rtdevice_pwm_device *pwm_device;
  rt_uint32_t arr_counter, ccr_counter, prescaler, sample_freq;
  rt_uint32_t channel_index;
  rt_uint32_t tim_clock;

  TIM_TimeBaseInitTypeDef TIM_TimeBaseInitType;
  TIM_OCInitTypeDef TIM_OCInitType;

  pwm_device = (struct rtdevice_pwm_device *)device;

  tim_clock = ch32f1_tim_clock_get(pwm_device->periph);

  channel_index = configuration->channel;

  /* change to freq, unit:Hz */
  sample_freq = 1000000000 / configuration->period;

  /*counter = (tim_clk / prescaler) / sample_freq */
  /*normally, tim_clk is not need div, if arr_counter over 65536, need div.*/
  prescaler = 1;

  arr_counter = (tim_clock / prescaler) / sample_freq;

  if (arr_counter > MAX_COUNTER)
  {
    /* need div tim_clock
    * and round up the prescaler value.
    * (tim_clock >> 16) = tim_clock / 65536
    */
    if ((tim_clock >> 16) % sample_freq == 0)
      prescaler = (tim_clock >> 16) / sample_freq;
    else
      prescaler = (tim_clock >> 16) / sample_freq + 1;

    /*counter = (tim_clk / prescaler) / sample_freq */
    arr_counter = (tim_clock / prescaler) / sample_freq;
  }
  /* ccr_counter = duty cycle * arr_counter */
  ccr_counter = (configuration->pulse * 100 / configuration->period) * arr_counter / 100;

  /* check arr_counter > 1, cxx_counter > 1 */
  if (arr_counter < MIN_COUNTER)
  {
    arr_counter = MIN_COUNTER;
  }

  if (ccr_counter < MIN_PULSE)
  {
    ccr_counter = MIN_PULSE;
  }

  /* TMRe base configuration */
  TIM_TimeBaseStructInit(&TIM_TimeBaseInitType);
  TIM_TimeBaseInitType.TIM_Period = arr_counter - 1;
  TIM_TimeBaseInitType.TIM_Prescaler = prescaler - 1;
  TIM_TimeBaseInitType.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseInitType.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(pwm_device->periph, &TIM_TimeBaseInitType);


  TIM_OCStructInit(&TIM_OCInitType);
  TIM_OCInitType.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitType.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitType.TIM_Pulse = ccr_counter - 1;
  TIM_OCInitType.TIM_OCPolarity = TIM_OCPolarity_High;

  if (channel_index == 1)
  {
    TIM_OC1Init(pwm_device->periph, &TIM_OCInitType);
    TIM_OC1PreloadConfig(pwm_device->periph, TIM_OCPreload_Disable);
  }
  else if (channel_index == 2)
  {
    TIM_OC2Init(pwm_device->periph, &TIM_OCInitType);
    TIM_OC2PreloadConfig(pwm_device->periph, TIM_OCPreload_Disable);
  }
  else if (channel_index == 3)
  {
    TIM_OC3Init(pwm_device->periph, &TIM_OCInitType);
    TIM_OC3PreloadConfig(pwm_device->periph, TIM_OCPreload_Disable);
  }
  else if (channel_index == 4)
  {
    TIM_OC4Init(pwm_device->periph, &TIM_OCInitType);
    TIM_OC4PreloadConfig(pwm_device->periph, TIM_OCPreload_Disable);
  }
  else
  {
    return -RT_EINVAL;
  }

  TIM_ARRPreloadConfig(pwm_device->periph, ENABLE);
  TIM_CtrlPWMOutputs(pwm_device->periph, ENABLE);

  return RT_EOK;
}

static rt_err_t drv_pwm_control(struct rt_device_pwm *device, int cmd, void *arg)
{
  struct rt_pwm_configuration *configuration;

  configuration = (struct rt_pwm_configuration *)arg;

  switch (cmd)
  {
  case PWM_CMD_ENABLE:
    return ch32f1_pwm_device_enable(device, configuration, RT_TRUE);
  case PWM_CMD_DISABLE:
    return ch32f1_pwm_device_enable(device, configuration, RT_FALSE);
  case PWM_CMD_SET:
    return ch32f1_pwm_device_set(device, configuration);
  case PWM_CMD_GET:
    return ch32f1_pwm_device_get(device, configuration);
  default:
    return -RT_EINVAL;
  }
}

static struct rt_pwm_ops pwm_ops =
    {
        .control = drv_pwm_control};

static int rt_hw_pwm_init(void)
{
  int result = RT_EOK;
  int index = 0;
  int channel_index;

  for (index = 0; index < ITEM_NUM(pwm_device_list); index++)
  {
    ch32f1_tim_clock_init(pwm_device_list[index].periph);
    for (channel_index = 0; channel_index < sizeof(pwm_device_list[index].channel); channel_index++)
    {
      if (pwm_device_list[index].channel[channel_index] != 0xFF)
      {
        ch32f1_pwm_io_init(pwm_device_list[index].periph, pwm_device_list[index].channel[channel_index]);
      }
    }

    if (rt_device_pwm_register(&pwm_device_list[index].parent, pwm_device_list[index].name, &pwm_ops, RT_NULL) == RT_EOK)
    {
      LOG_D("%s register success", pwm_device_list[index].name);
    }
    else
    {
      LOG_D("%s register failed", pwm_device_list[index].name);
      result = -RT_ERROR;
    }
  }

  return result;
}

INIT_BOARD_EXPORT(rt_hw_pwm_init);

#endif /* BSP_USING_PWM */