// SPDX-License-Identifier: GPL-2.0 /* * simple driver for PWM (Pulse Width Modulator) controller * * Derived from pxa PWM driver by eric miao <[email protected]> * * Limitations: * - When disabled the output is driven to 0 independent of the configured * polarity. */ #include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/err.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/slab.h> #define MX3_PWMCR … #define MX3_PWMSR … #define MX3_PWMSAR … #define MX3_PWMPR … #define MX3_PWMCR_FWM … #define MX3_PWMCR_STOPEN … #define MX3_PWMCR_DOZEN … #define MX3_PWMCR_WAITEN … #define MX3_PWMCR_DBGEN … #define MX3_PWMCR_BCTR … #define MX3_PWMCR_HCTR … #define MX3_PWMCR_POUTC … #define MX3_PWMCR_POUTC_NORMAL … #define MX3_PWMCR_POUTC_INVERTED … #define MX3_PWMCR_POUTC_OFF … #define MX3_PWMCR_CLKSRC … #define MX3_PWMCR_CLKSRC_OFF … #define MX3_PWMCR_CLKSRC_IPG … #define MX3_PWMCR_CLKSRC_IPG_HIGH … #define MX3_PWMCR_CLKSRC_IPG_32K … #define MX3_PWMCR_PRESCALER … #define MX3_PWMCR_SWR … #define MX3_PWMCR_REPEAT … #define MX3_PWMCR_REPEAT_1X … #define MX3_PWMCR_REPEAT_2X … #define MX3_PWMCR_REPEAT_4X … #define MX3_PWMCR_REPEAT_8X … #define MX3_PWMCR_EN … #define MX3_PWMSR_FWE … #define MX3_PWMSR_CMP … #define MX3_PWMSR_ROV … #define MX3_PWMSR_FE … #define MX3_PWMSR_FIFOAV … #define MX3_PWMSR_FIFOAV_EMPTY … #define MX3_PWMSR_FIFOAV_1WORD … #define MX3_PWMSR_FIFOAV_2WORDS … #define MX3_PWMSR_FIFOAV_3WORDS … #define MX3_PWMSR_FIFOAV_4WORDS … #define MX3_PWMCR_PRESCALER_SET(x) … #define MX3_PWMCR_PRESCALER_GET(x) … #define MX3_PWM_SWR_LOOP … /* PWMPR register value of 0xffff has the same effect as 0xfffe */ #define MX3_PWMPR_MAX … struct pwm_imx27_chip { … }; static inline struct pwm_imx27_chip *to_pwm_imx27_chip(struct pwm_chip *chip) { … } static int pwm_imx27_clk_prepare_enable(struct pwm_imx27_chip *imx) { … } static void pwm_imx27_clk_disable_unprepare(struct pwm_imx27_chip *imx) { … } static int pwm_imx27_get_state(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { … } static void pwm_imx27_sw_reset(struct pwm_chip *chip) { … } static void pwm_imx27_wait_fifo_slot(struct pwm_chip *chip, struct pwm_device *pwm) { … } static int pwm_imx27_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { … } static const struct pwm_ops pwm_imx27_ops = …; static const struct of_device_id pwm_imx27_dt_ids[] = …; MODULE_DEVICE_TABLE(of, pwm_imx27_dt_ids); static int pwm_imx27_probe(struct platform_device *pdev) { … } static struct platform_driver imx_pwm_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …;
Codebase Browser
linux