// SPDX-License-Identifier: GPL-2.0 /* * Copyright 2018-2019 NXP. * * Limitations: * - The TPM counter and period counter are shared between * multiple channels, so all channels should use same period * settings. * - Changes to polarity cannot be latched at the time of the * next period start. * - Changing period and duty cycle together isn't atomic, * with the wrong timing it might happen that a period is * produced with old duty cycle but new period settings. */ #include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/slab.h> #define PWM_IMX_TPM_PARAM … #define PWM_IMX_TPM_GLOBAL … #define PWM_IMX_TPM_SC … #define PWM_IMX_TPM_CNT … #define PWM_IMX_TPM_MOD … #define PWM_IMX_TPM_CnSC(n) … #define PWM_IMX_TPM_CnV(n) … #define PWM_IMX_TPM_PARAM_CHAN … #define PWM_IMX_TPM_SC_PS … #define PWM_IMX_TPM_SC_CMOD … #define PWM_IMX_TPM_SC_CMOD_INC_EVERY_CLK … #define PWM_IMX_TPM_SC_CPWMS … #define PWM_IMX_TPM_CnSC_CHF … #define PWM_IMX_TPM_CnSC_MSB … #define PWM_IMX_TPM_CnSC_MSA … /* * The reference manual describes this field as two separate bits. The * semantic of the two bits isn't orthogonal though, so they are treated * together as a 2-bit field here. */ #define PWM_IMX_TPM_CnSC_ELS … #define PWM_IMX_TPM_CnSC_ELS_INVERSED … #define PWM_IMX_TPM_CnSC_ELS_NORMAL … #define PWM_IMX_TPM_MOD_WIDTH … #define PWM_IMX_TPM_MOD_MOD … struct imx_tpm_pwm_chip { … }; struct imx_tpm_pwm_param { … }; static inline struct imx_tpm_pwm_chip * to_imx_tpm_pwm_chip(struct pwm_chip *chip) { … } /* * This function determines for a given pwm_state *state that a consumer * might request the pwm_state *real_state that eventually is implemented * by the hardware and the necessary register values (in *p) to achieve * this. */ static int pwm_imx_tpm_round_state(struct pwm_chip *chip, struct imx_tpm_pwm_param *p, struct pwm_state *real_state, const struct pwm_state *state) { … } static int pwm_imx_tpm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { … } /* this function is supposed to be called with mutex hold */ static int pwm_imx_tpm_apply_hw(struct pwm_chip *chip, struct imx_tpm_pwm_param *p, struct pwm_state *state, struct pwm_device *pwm) { … } static int pwm_imx_tpm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { … } static int pwm_imx_tpm_request(struct pwm_chip *chip, struct pwm_device *pwm) { … } static void pwm_imx_tpm_free(struct pwm_chip *chip, struct pwm_device *pwm) { … } static const struct pwm_ops imx_tpm_pwm_ops = …; static int pwm_imx_tpm_probe(struct platform_device *pdev) { … } static int pwm_imx_tpm_suspend(struct device *dev) { … } static int pwm_imx_tpm_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(imx_tpm_pwm_pm, pwm_imx_tpm_suspend, pwm_imx_tpm_resume); static const struct of_device_id imx_tpm_pwm_dt_ids[] = …; MODULE_DEVICE_TABLE(of, imx_tpm_pwm_dt_ids); static struct platform_driver imx_tpm_pwm_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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