66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2011 by Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "pwm-imx233.h"
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#include "clkctrl-imx233.h"
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#include "pinctrl-imx233.h"
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void imx233_pwm_init(void)
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{
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imx233_reset_block(&HW_PWM_CTRL);
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imx233_clkctrl_enable_xtal(XTAM_PWM, true);
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}
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bool imx233_pwm_is_channel_enable(int channel)
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{
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return HW_PWM_CTRL & HW_PWM_CTRL__PWMx_ENABLE(channel);
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}
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void imx233_pwm_enable_channel(int channel, bool enable)
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{
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if(enable)
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__REG_SET(HW_PWM_CTRL) = HW_PWM_CTRL__PWMx_ENABLE(channel);
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else
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__REG_CLR(HW_PWM_CTRL) = HW_PWM_CTRL__PWMx_ENABLE(channel);
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}
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void imx233_pwm_setup_channel(int channel, int period, int cdiv, int active,
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int active_state, int inactive, int inactive_state)
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{
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/* stop */
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bool enable = imx233_pwm_is_channel_enable(channel);
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if(enable)
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imx233_pwm_enable_channel(channel, false);
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/* setup pin */
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imx233_pinctrl_acquire_pin(IMX233_PWM_PIN_BANK(channel),
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IMX233_PWM_PIN(channel), "pwm");
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imx233_set_pin_function(IMX233_PWM_PIN_BANK(channel), IMX233_PWM_PIN(channel),
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PINCTRL_FUNCTION_MAIN);
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imx233_set_pin_drive_strength(IMX233_PWM_PIN_BANK(channel), IMX233_PWM_PIN(channel),
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PINCTRL_DRIVE_4mA);
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/* watch the order ! active THEN period */
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HW_PWM_ACTIVEx(channel) = active << HW_PWM_ACTIVEx__ACTIVE_BP |
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inactive << HW_PWM_ACTIVEx__INACTIVE_BP;
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HW_PWM_PERIODx(channel) = period | active_state << HW_PWM_PERIODx__ACTIVE_STATE_BP |
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inactive_state << HW_PWM_PERIODx__INACTIVE_STATE_BP |
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cdiv << HW_PWM_PERIODx__CDIV_BP;
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/* restore */
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imx233_pwm_enable_channel(channel, enable);
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}
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