// SPDX-License-Identifier: GPL-2.0-or-later /* * Broadcom BCM7038 PWM driver * Author: Florian Fainelli * * Copyright (C) 2015 Broadcom Corporation */ #define pr_fmt(fmt) … #include <linux/clk.h> #include <linux/export.h> #include <linux/init.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/spinlock.h> #define PWM_CTRL … #define CTRL_START … #define CTRL_OEB … #define CTRL_FORCE_HIGH … #define CTRL_OPENDRAIN … #define CTRL_CHAN_OFFS … #define PWM_CTRL2 … #define CTRL2_OUT_SELECT … #define PWM_CH_SIZE … #define PWM_CWORD_MSB(ch) … #define PWM_CWORD_LSB(ch) … /* Number of bits for the CWORD value */ #define CWORD_BIT_SIZE … /* * Maximum control word value allowed when variable-frequency PWM is used as a * clock for the constant-frequency PMW. */ #define CONST_VAR_F_MAX … #define CONST_VAR_F_MIN … #define PWM_ON(ch) … #define PWM_ON_MIN … #define PWM_PERIOD(ch) … #define PWM_PERIOD_MIN … #define PWM_ON_PERIOD_MAX … struct brcmstb_pwm { … }; static inline u32 brcmstb_pwm_readl(struct brcmstb_pwm *p, unsigned int offset) { … } static inline void brcmstb_pwm_writel(struct brcmstb_pwm *p, u32 value, unsigned int offset) { … } static inline struct brcmstb_pwm *to_brcmstb_pwm(struct pwm_chip *chip) { … } /* * Fv is derived from the variable frequency output. The variable frequency * output is configured using this formula: * * W = cword, if cword < 2 ^ 15 else 16-bit 2's complement of cword * * Fv = W x 2 ^ -16 x 27Mhz (reference clock) * * The period is: (period + 1) / Fv and "on" time is on / (period + 1) * * The PWM core framework specifies that the "duty_ns" parameter is in fact the * "on" time, so this translates directly into our HW programming here. */ static int brcmstb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, u64 duty_ns, u64 period_ns) { … } static inline void brcmstb_pwm_enable_set(struct brcmstb_pwm *p, unsigned int channel, bool enable) { … } static int brcmstb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { … } static const struct pwm_ops brcmstb_pwm_ops = …; static const struct of_device_id brcmstb_pwm_of_match[] = …; MODULE_DEVICE_TABLE(of, brcmstb_pwm_of_match); static int brcmstb_pwm_probe(struct platform_device *pdev) { … } static int brcmstb_pwm_suspend(struct device *dev) { … } static int brcmstb_pwm_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(brcmstb_pwm_pm_ops, brcmstb_pwm_suspend, brcmstb_pwm_resume); static struct platform_driver brcmstb_pwm_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_ALIAS(…) …; MODULE_LICENSE(…) …;
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