// SPDX-License-Identifier: GPL-2.0-or-later /* * EHRPWM PWM driver * * Copyright (C) 2012 Texas Instruments, Inc. - https://www.ti.com/ */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/io.h> #include <linux/err.h> #include <linux/clk.h> #include <linux/pm_runtime.h> #include <linux/of.h> /* EHRPWM registers and bits definitions */ /* Time base module registers */ #define TBCTL … #define TBPRD … #define TBCTL_PRDLD_MASK … #define TBCTL_PRDLD_SHDW … #define TBCTL_PRDLD_IMDT … #define TBCTL_CLKDIV_MASK … #define TBCTL_CTRMODE_MASK … #define TBCTL_CTRMODE_UP … #define TBCTL_CTRMODE_DOWN … #define TBCTL_CTRMODE_UPDOWN … #define TBCTL_CTRMODE_FREEZE … #define TBCTL_HSPCLKDIV_SHIFT … #define TBCTL_CLKDIV_SHIFT … #define CLKDIV_MAX … #define HSPCLKDIV_MAX … #define PERIOD_MAX … /* compare module registers */ #define CMPA … #define CMPB … /* Action qualifier module registers */ #define AQCTLA … #define AQCTLB … #define AQSFRC … #define AQCSFRC … #define AQCTL_CBU_MASK … #define AQCTL_CBU_FRCLOW … #define AQCTL_CBU_FRCHIGH … #define AQCTL_CBU_FRCTOGGLE … #define AQCTL_CAU_MASK … #define AQCTL_CAU_FRCLOW … #define AQCTL_CAU_FRCHIGH … #define AQCTL_CAU_FRCTOGGLE … #define AQCTL_PRD_MASK … #define AQCTL_PRD_FRCLOW … #define AQCTL_PRD_FRCHIGH … #define AQCTL_PRD_FRCTOGGLE … #define AQCTL_ZRO_MASK … #define AQCTL_ZRO_FRCLOW … #define AQCTL_ZRO_FRCHIGH … #define AQCTL_ZRO_FRCTOGGLE … #define AQCTL_CHANA_POLNORMAL … #define AQCTL_CHANA_POLINVERSED … #define AQCTL_CHANB_POLNORMAL … #define AQCTL_CHANB_POLINVERSED … #define AQSFRC_RLDCSF_MASK … #define AQSFRC_RLDCSF_ZRO … #define AQSFRC_RLDCSF_PRD … #define AQSFRC_RLDCSF_ZROPRD … #define AQSFRC_RLDCSF_IMDT … #define AQCSFRC_CSFB_MASK … #define AQCSFRC_CSFB_FRCDIS … #define AQCSFRC_CSFB_FRCLOW … #define AQCSFRC_CSFB_FRCHIGH … #define AQCSFRC_CSFB_DISSWFRC … #define AQCSFRC_CSFA_MASK … #define AQCSFRC_CSFA_FRCDIS … #define AQCSFRC_CSFA_FRCLOW … #define AQCSFRC_CSFA_FRCHIGH … #define AQCSFRC_CSFA_DISSWFRC … #define NUM_PWM_CHANNEL … struct ehrpwm_context { … }; struct ehrpwm_pwm_chip { … }; static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip) { … } static inline u16 ehrpwm_read(void __iomem *base, unsigned int offset) { … } static inline void ehrpwm_write(void __iomem *base, unsigned int offset, u16 value) { … } static void ehrpwm_modify(void __iomem *base, unsigned int offset, u16 mask, u16 value) { … } /** * set_prescale_div - Set up the prescaler divider function * @rqst_prescaler: prescaler value min * @prescale_div: prescaler value set * @tb_clk_div: Time Base Control prescaler bits */ static int set_prescale_div(unsigned long rqst_prescaler, u16 *prescale_div, u16 *tb_clk_div) { … } static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan) { … } /* * period_ns = 10^9 * (ps_divval * period_cycles) / PWM_CLK_RATE * duty_ns = 10^9 * (ps_divval * duty_cycles) / PWM_CLK_RATE */ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, u64 duty_ns, u64 period_ns) { … } static int ehrpwm_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm, enum pwm_polarity polarity) { … } static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { … } static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { … } static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { … } static int ehrpwm_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { … } static const struct pwm_ops ehrpwm_pwm_ops = …; static const struct of_device_id ehrpwm_of_match[] = …; MODULE_DEVICE_TABLE(of, ehrpwm_of_match); static int ehrpwm_pwm_probe(struct platform_device *pdev) { … } static void ehrpwm_pwm_remove(struct platform_device *pdev) { … } static void ehrpwm_pwm_save_context(struct pwm_chip *chip) { … } static void ehrpwm_pwm_restore_context(struct pwm_chip *chip) { … } static int ehrpwm_pwm_suspend(struct device *dev) { … } static int ehrpwm_pwm_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(ehrpwm_pwm_pm_ops, ehrpwm_pwm_suspend, ehrpwm_pwm_resume); static struct platform_driver ehrpwm_pwm_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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