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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2011 by Amaury Pouly
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "pwm-imx233.h"
#include "clkctrl-imx233.h"
#include "pinctrl-imx233.h"
void imx233_pwm_init(void)
{
imx233_reset_block(&HW_PWM_CTRL);
imx233_clkctrl_enable_xtal(XTAM_PWM, true);
}
bool imx233_pwm_is_channel_enable(int channel)
{
return HW_PWM_CTRL & HW_PWM_CTRL__PWMx_ENABLE(channel);
}
void imx233_pwm_enable_channel(int channel, bool enable)
{
if(enable)
__REG_SET(HW_PWM_CTRL) = HW_PWM_CTRL__PWMx_ENABLE(channel);
else
__REG_CLR(HW_PWM_CTRL) = HW_PWM_CTRL__PWMx_ENABLE(channel);
}
void imx233_pwm_setup_channel(int channel, int period, int cdiv, int active,
int active_state, int inactive, int inactive_state)
{
/* stop */
bool enable = imx233_pwm_is_channel_enable(channel);
if(enable)
imx233_pwm_enable_channel(channel, false);
/* setup pin */
imx233_set_pin_function(IMX233_PWM_PIN_BANK(channel), IMX233_PWM_PIN(channel),
PINCTRL_FUNCTION_MAIN);
imx233_set_pin_drive_strength(IMX233_PWM_PIN_BANK(channel), IMX233_PWM_PIN(channel),
PINCTRL_DRIVE_4mA);
/* watch the order ! active THEN period */
HW_PWM_ACTIVEx(channel) = active << HW_PWM_ACTIVEx__ACTIVE_BP |
inactive << HW_PWM_ACTIVEx__INACTIVE_BP;
HW_PWM_PERIODx(channel) = period | active_state << HW_PWM_PERIODx__ACTIVE_STATE_BP |
inactive_state << HW_PWM_PERIODx__INACTIVE_STATE_BP |
cdiv << HW_PWM_PERIODx__CDIV_BP;
/* restore */
imx233_pwm_enable_channel(channel, enable);
}
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