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e8924005b4
STM32 Low-Power Timer hardware block can be used for: - PWM generation - IIO trigger (in sync with PWM) - IIO quadrature encoder counter PWM and IIO timer configuration are mixed in the same registers so we need a multi fonction driver to be able to share those registers. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*
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* STM32 Low-Power Timer parent driver.
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*
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* Copyright (C) STMicroelectronics 2017
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*
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* Author: Fabrice Gasnier <fabrice.gasnier@st.com>
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*
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* Inspired by Benjamin Gaignard's stm32-timers driver
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*
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* License terms: GNU General Public License (GPL), version 2
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*/
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#ifndef _LINUX_STM32_LPTIMER_H_
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#define _LINUX_STM32_LPTIMER_H_
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#include <linux/clk.h>
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#include <linux/regmap.h>
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#define STM32_LPTIM_ISR 0x00 /* Interrupt and Status Reg */
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#define STM32_LPTIM_ICR 0x04 /* Interrupt Clear Reg */
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#define STM32_LPTIM_IER 0x08 /* Interrupt Enable Reg */
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#define STM32_LPTIM_CFGR 0x0C /* Configuration Reg */
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#define STM32_LPTIM_CR 0x10 /* Control Reg */
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#define STM32_LPTIM_CMP 0x14 /* Compare Reg */
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#define STM32_LPTIM_ARR 0x18 /* Autoreload Reg */
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#define STM32_LPTIM_CNT 0x1C /* Counter Reg */
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/* STM32_LPTIM_ISR - bit fields */
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#define STM32_LPTIM_CMPOK_ARROK GENMASK(4, 3)
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#define STM32_LPTIM_ARROK BIT(4)
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#define STM32_LPTIM_CMPOK BIT(3)
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/* STM32_LPTIM_ICR - bit fields */
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#define STM32_LPTIM_CMPOKCF_ARROKCF GENMASK(4, 3)
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/* STM32_LPTIM_CR - bit fields */
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#define STM32_LPTIM_CNTSTRT BIT(2)
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#define STM32_LPTIM_ENABLE BIT(0)
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/* STM32_LPTIM_CFGR - bit fields */
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#define STM32_LPTIM_ENC BIT(24)
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#define STM32_LPTIM_COUNTMODE BIT(23)
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#define STM32_LPTIM_WAVPOL BIT(21)
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#define STM32_LPTIM_PRESC GENMASK(11, 9)
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#define STM32_LPTIM_CKPOL GENMASK(2, 1)
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/* STM32_LPTIM_ARR */
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#define STM32_LPTIM_MAX_ARR 0xFFFF
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/**
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* struct stm32_lptimer - STM32 Low-Power Timer data assigned by parent device
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* @clk: clock reference for this instance
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* @regmap: register map reference for this instance
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* @has_encoder: indicates this Low-Power Timer supports encoder mode
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*/
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struct stm32_lptimer {
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struct clk *clk;
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struct regmap *regmap;
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bool has_encoder;
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};
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#endif
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