// SPDX-License-Identifier: GPL-2.0-only /* * Imagination Technologies Pulse Width Modulator driver * * Copyright (c) 2014-2015, Imagination Technologies * * Based on drivers/pwm/pwm-tegra.c, Copyright (c) 2010, NVIDIA Corporation */ #include <linux/clk.h> #include <linux/err.h> #include <linux/io.h> #include <linux/mfd/syscon.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/property.h> #include <linux/pwm.h> #include <linux/regmap.h> #include <linux/slab.h> /* PWM registers */ #define PWM_CTRL_CFG … #define PWM_CTRL_CFG_NO_SUB_DIV … #define PWM_CTRL_CFG_SUB_DIV0 … #define PWM_CTRL_CFG_SUB_DIV1 … #define PWM_CTRL_CFG_SUB_DIV0_DIV1 … #define PWM_CTRL_CFG_DIV_SHIFT(ch) … #define PWM_CTRL_CFG_DIV_MASK … #define PWM_CH_CFG(ch) … #define PWM_CH_CFG_TMBASE_SHIFT … #define PWM_CH_CFG_DUTY_SHIFT … #define PERIP_PWM_PDM_CONTROL … #define PERIP_PWM_PDM_CONTROL_CH_MASK … #define PERIP_PWM_PDM_CONTROL_CH_SHIFT(ch) … #define IMG_PWM_PM_TIMEOUT … /* * PWM period is specified with a timebase register, * in number of step periods. The PWM duty cycle is also * specified in step periods, in the [0, $timebase] range. * In other words, the timebase imposes the duty cycle * resolution. Therefore, let's constraint the timebase to * a minimum value to allow a sane range of duty cycle values. * Imposing a minimum timebase, will impose a maximum PWM frequency. * * The value chosen is completely arbitrary. */ #define MIN_TMBASE_STEPS … #define IMG_PWM_NPWM … struct img_pwm_soc_data { … }; struct img_pwm_chip { … }; static inline struct img_pwm_chip *to_img_pwm_chip(struct pwm_chip *chip) { … } static inline void img_pwm_writel(struct img_pwm_chip *imgchip, u32 reg, u32 val) { … } static inline u32 img_pwm_readl(struct img_pwm_chip *imgchip, u32 reg) { … } static int img_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { … } static int img_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { … } static void img_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { … } static int img_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { … } static const struct pwm_ops img_pwm_ops = …; static const struct img_pwm_soc_data pistachio_pwm = …; static const struct of_device_id img_pwm_of_match[] = …; MODULE_DEVICE_TABLE(of, img_pwm_of_match); static int img_pwm_runtime_suspend(struct device *dev) { … } static int img_pwm_runtime_resume(struct device *dev) { … } static int img_pwm_probe(struct platform_device *pdev) { … } static void img_pwm_remove(struct platform_device *pdev) { … } #ifdef CONFIG_PM_SLEEP static int img_pwm_suspend(struct device *dev) { … } static int img_pwm_resume(struct device *dev) { … } #endif /* CONFIG_PM */ static const struct dev_pm_ops img_pwm_pm_ops = …; static struct platform_driver img_pwm_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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