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/*
* This file is part of FH8620 BSP for RT-Thread distribution.
*
* Copyright (c) 2016 Shanghai Fullhan Microelectronics Co., Ltd.
* All rights reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Visit http://www.fullhan.com to get contact with Fullhan.
*
* Change Logs:
* Date Author Notes
*/
#include "fh_def.h"
#include "pwm.h"
#include "interrupt.h"
#include "board_info.h"
#include "inc/fh_driverlib.h"
#include <rtdevice.h>
#ifdef FH_PWM_DEBUG
#define PRINT_PWM_DBG(fmt, args...) \
do \
{ \
rt_kprintf("FH_PWM_DEBUG: "); \
rt_kprintf(fmt, ## args); \
} \
while(0)
#else
#define PRINT_PWM_DBG(fmt, args...) do { } while (0)
#endif
static struct pwm_driver pwm_drv =
{
};
static int pwm_get_duty_cycle_ns(struct pwm_device* pwm)
{
struct fh_pwm_obj *pwm_obj = (struct fh_pwm_obj *)pwm_drv.priv;
rt_uint32_t reg, period, duty;
rt_uint32_t clk_rate = 1000000/*todo: clk_get_rate(fh_pwm_ctrl.clk)*/;
reg = PWM_GetPwmCmd(pwm_obj, pwm->id);
period = reg & 0x0fff;
duty = (reg >> 16) & 0xfff;
duty = period - duty; //reverse duty cycle
if(period == 0)
{
period = duty;
}
pwm->counter_ns = duty * 1000000000 / clk_rate;
pwm->period_ns = period * 1000000000 / clk_rate;
PRINT_PWM_DBG("get duty: %d, period: %d, reg: 0x%x\n", duty, period, reg);
return 0;
}
static int pwm_set_duty_cycle_ns(struct pwm_device* pwm)
{
struct fh_pwm_obj *pwm_obj = (struct fh_pwm_obj *)pwm_drv.priv;
rt_uint32_t period, duty, reg, clk_rate, duty_revert;
clk_rate = 1000000/*todo: clk_get_rate(fh_pwm_ctrl.clk)*/;
if(!clk_rate)
{
rt_kprintf("PWM: clock rate is 0\n");
return -RT_EIO;
}
period = pwm->period_ns / (1000000000 / clk_rate);
if(period < 8)
{
rt_kprintf("PWM: min period is 8\n");
return -RT_EIO;
}
duty = pwm->counter_ns / (1000000000 / clk_rate);
if(period < duty)
{
rt_kprintf("PWM: period < duty\n");
return -RT_EIO;
}
duty_revert = period - duty;
if(duty == period)
{
reg = (duty & 0xfff) << 16 | (0 & 0xfff);
}
else
{
reg = (duty_revert & 0xfff) << 16 | (period & 0xfff);
}
PRINT_PWM_DBG("set duty_revert: %d, period: %d, reg: 0x%x\n", duty_revert, period, reg);
PWM_SetPwmCmd(pwm_obj, pwm->id, reg);
return 0;
}
static rt_err_t fh_pwm_open(rt_device_t dev, rt_uint16_t oflag)
{
struct fh_pwm_obj *pwm_obj = (struct fh_pwm_obj *)pwm_drv.priv;
PWM_Enable(pwm_obj, RT_TRUE);
return 0;
}
static rt_err_t fh_pwm_close(rt_device_t dev)
{
struct fh_pwm_obj *pwm_obj = (struct fh_pwm_obj *)pwm_drv.priv;
PWM_Enable(pwm_obj, RT_FALSE);
return 0;
}
static rt_err_t fh_pwm_ioctl(rt_device_t dev, int cmd, void *arg)
{
int ret = 0;
struct pwm_device *pwm;
struct fh_pwm_obj *pwm_obj = (struct fh_pwm_obj *)pwm_drv.priv;
switch(cmd)
{
case ENABLE_PWM:
PWM_Enable(pwm_obj, RT_FALSE);
break;
case DISABLE_PWM:
PWM_Enable(pwm_obj, RT_TRUE);
break;
case SET_PWM_DUTY_CYCLE:
pwm = (struct pwm_device *)arg;
PRINT_PWM_DBG("ioctl: pwm addr: %p, pwm->period: %d ns\n", pwm, pwm->period_ns);
pwm_set_duty_cycle_ns(pwm);
break;
case GET_PWM_DUTY_CYCLE:
pwm = (struct pwm_device *)arg;
PRINT_PWM_DBG("ioctl: pwm->id: %d, pwm->counter: %d, pwm->period: %d\n", pwm->id, pwm->counter_ns, pwm->period_ns);
pwm_get_duty_cycle_ns(pwm);
break;
}
return ret;
}
int fh_pwm_probe(void *priv_data)
{
rt_device_t pwm_dev ;
struct fh_pwm_obj *pwm_obj = (struct fh_pwm_obj *)priv_data;
rt_memset(&pwm_drv, 0, sizeof(struct pwm_driver));
pwm_drv.pwm[0].id = 0;
pwm_drv.pwm[1].id = 1;
pwm_drv.pwm[2].id = 2;
pwm_drv.pwm[0].working = 0;
pwm_drv.pwm[1].working = 0;
pwm_drv.pwm[2].working = 0;
pwm_drv.priv = pwm_obj;
//todo: clk
PWM_Enable(pwm_obj, RT_FALSE);
pwm_dev = rt_malloc(sizeof(struct rt_device));
rt_memset(pwm_dev, 0, sizeof(struct rt_device));
if (pwm_dev == RT_NULL)
{
rt_kprintf("ERROR: %s rt_device malloc failed\n", __func__);
}
pwm_dev->user_data = &pwm_drv;
pwm_dev->open =fh_pwm_open;
pwm_dev->close = fh_pwm_close;
pwm_dev->control = fh_pwm_ioctl;
pwm_dev->type = RT_Device_Class_Miscellaneous;
rt_device_register(pwm_dev, "pwm", RT_DEVICE_FLAG_RDWR);
return 0;
}
int fh_pwm_exit(void *priv_data)
{
return 0;
}
struct fh_board_ops pwm_driver_ops =
{
.probe = fh_pwm_probe,
.exit = fh_pwm_exit,
};
void rt_hw_pwm_init(void)
{
PRINT_PWM_DBG("%s start\n", __func__);
fh_board_driver_register("pwm", &pwm_driver_ops);
PRINT_PWM_DBG("%s end\n", __func__);
}
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