From 9d871139583fdd0180f2b6893dee1d160a8593e5 Mon Sep 17 00:00:00 2001 From: Amaury Pouly Date: Sat, 19 May 2012 13:40:34 +0200 Subject: imx233: add pwm driver Change-Id: Ib920b119f52b492247d75e97c5ec9298146d583c --- firmware/target/arm/imx233/pwm-imx233.c | 64 ++++++++++++++++++++++++++++ firmware/target/arm/imx233/pwm-imx233.h | 68 ++++++++++++++++++++++++++++++ firmware/target/arm/imx233/system-imx233.c | 2 + 3 files changed, 134 insertions(+) create mode 100644 firmware/target/arm/imx233/pwm-imx233.c create mode 100644 firmware/target/arm/imx233/pwm-imx233.h (limited to 'firmware/target/arm') diff --git a/firmware/target/arm/imx233/pwm-imx233.c b/firmware/target/arm/imx233/pwm-imx233.c new file mode 100644 index 0000000000..1c5e4657de --- /dev/null +++ b/firmware/target/arm/imx233/pwm-imx233.c @@ -0,0 +1,64 @@ +/*************************************************************************** + * __________ __ ___. + * 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); +} diff --git a/firmware/target/arm/imx233/pwm-imx233.h b/firmware/target/arm/imx233/pwm-imx233.h new file mode 100644 index 0000000000..48c7811d47 --- /dev/null +++ b/firmware/target/arm/imx233/pwm-imx233.h @@ -0,0 +1,68 @@ +/*************************************************************************** + * __________ __ ___. + * 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. + * + ****************************************************************************/ +#ifndef __PWM_IMX233_H__ +#define __PWM_IMX233_H__ + +#include "system.h" + +#define HW_PWM_BASE 0x80064000 + +#define HW_PWM_CTRL (*(volatile uint32_t *)(HW_PWM_BASE + 0x0)) +#define HW_PWM_CTRL__PWMx_ENABLE(x) (1 << (x)) + +#define HW_PWM_ACTIVEx(x) (*(volatile uint32_t *)(HW_PWM_BASE + 0x10 + (x) * 0x20)) +#define HW_PWM_ACTIVEx__ACTIVE_BP 0 +#define HW_PWM_ACTIVEx__ACTIVE_BM 0xffff +#define HW_PWM_ACTIVEx__INACTIVE_BP 16 +#define HW_PWM_ACTIVEx__INACTIVE_BM 0xffff0000 + +#define HW_PWM_PERIODx(x) (*(volatile uint32_t *)(HW_PWM_BASE + 0x20 + (x) * 0x20)) +#define HW_PWM_PERIODx__PERIOD_BP 0 +#define HW_PWM_PERIODx__PERIOD_BM 0xffff +#define HW_PWM_PERIODx__ACTIVE_STATE_BP 16 +#define HW_PWM_PERIODx__ACTIVE_STATE_BM (0x3 << 16) +#define HW_PWM_PERIODx__INACTIVE_STATE_BP 18 +#define HW_PWM_PERIODx__INACTIVE_STATE_BM (0x3 << 18) +#define HW_PWM_PERIODx__CDIV_BP 20 +#define HW_PWM_PERIODx__CDIV_BM (0x7 << 20) +#define HW_PWM_PERIODx__CDIV__DIV_1 0 +#define HW_PWM_PERIODx__CDIV__DIV_2 1 +#define HW_PWM_PERIODx__CDIV__DIV_4 2 +#define HW_PWM_PERIODx__CDIV__DIV_8 3 +#define HW_PWM_PERIODx__CDIV__DIV_16 4 +#define HW_PWM_PERIODx__CDIV__DIV_64 5 +#define HW_PWM_PERIODx__CDIV__DIV_256 6 +#define HW_PWM_PERIODx__CDIV__DIV_1024 7 + +#define HW_PWM_PERIODx__STATE__HI_Z 0 +#define HW_PWM_PERIODx__STATE__LOW 2 +#define HW_PWM_PERIODx__STATE__HIGH 3 + +#define IMX233_PWM_PIN_BANK(channel) 1 +#define IMX233_PWM_PIN(channel) (26 + (channel)) + +void imx233_pwm_init(void); +void imx233_pwm_setup_channel(int channel, int period, int cdiv, int active, + int active_state, int inactive, int inactive_state); +void imx233_pwm_enable_channel(int channel, bool enable); +bool imx233_pwm_is_channel_enable(int channel); + +#endif /* __PWM_IMX233_H__ */ diff --git a/firmware/target/arm/imx233/system-imx233.c b/firmware/target/arm/imx233/system-imx233.c index a06ecab9f5..eb9a3f8ee0 100644 --- a/firmware/target/arm/imx233/system-imx233.c +++ b/firmware/target/arm/imx233/system-imx233.c @@ -31,6 +31,7 @@ #include "ssp-imx233.h" #include "i2c-imx233.h" #include "dcp-imx233.h" +#include "pwm-imx233.h" #include "icoll-imx233.h" #include "lradc-imx233.h" #include "rtc-imx233.h" @@ -99,6 +100,7 @@ void system_init(void) imx233_dma_init(); imx233_ssp_init(); imx233_dcp_init(); + imx233_pwm_init(); imx233_lradc_init(); imx233_i2c_init(); #if defined(SANSA_FUZEPLUS) && !defined(BOOTLOADER) -- cgit v1.2.3