// SPDX-License-Identifier: GPL-2.0-or-later /* * ECAP Capture driver * * Copyright (C) 2022 Julien Panis <[email protected]> */ #include <linux/atomic.h> #include <linux/clk.h> #include <linux/counter.h> #include <linux/err.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/mutex.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/regmap.h> #define ECAP_DRV_NAME … /* ECAP event IDs */ #define ECAP_CEVT1 … #define ECAP_CEVT2 … #define ECAP_CEVT3 … #define ECAP_CEVT4 … #define ECAP_CNTOVF … #define ECAP_CEVT_LAST … #define ECAP_NB_CEVT … #define ECAP_EVT_LAST … #define ECAP_NB_EVT … /* Registers */ #define ECAP_TSCNT_REG … #define ECAP_CAP_REG(i) … #define ECAP_ECCTL_REG … #define ECAP_CAPPOL_BIT(i) … #define ECAP_EV_MODE_MASK … #define ECAP_CAPLDEN_BIT … #define ECAP_CONT_ONESHT_BIT … #define ECAP_STOPVALUE_MASK … #define ECAP_TSCNTSTP_BIT … #define ECAP_SYNCO_DIS_MASK … #define ECAP_CAP_APWM_BIT … #define ECAP_ECCTL_EN_MASK … #define ECAP_ECCTL_CFG_MASK … #define ECAP_ECINT_EN_FLG_REG … #define ECAP_EVT_EN_MASK … #define ECAP_EVT_FLG_BIT(i) … #define ECAP_ECINT_CLR_FRC_REG … #define ECAP_INT_CLR_BIT … #define ECAP_EVT_CLR_BIT(i) … #define ECAP_EVT_CLR_MASK … #define ECAP_PID_REG … /* ECAP signals */ #define ECAP_CLOCK_SIG … #define ECAP_INPUT_SIG … static const struct regmap_config ecap_cnt_regmap_config = …; /** * struct ecap_cnt_dev - device private data structure * @enabled: device state * @lock: synchronization lock to prevent I/O race conditions * @clk: device clock * @regmap: device register map * @nb_ovf: number of overflows since capture start * @pm_ctx: device context for PM operations * @pm_ctx.ev_mode: event mode bits * @pm_ctx.time_cntr: timestamp counter value */ struct ecap_cnt_dev { … }; static u8 ecap_cnt_capture_get_evmode(struct counter_device *counter) { … } static void ecap_cnt_capture_set_evmode(struct counter_device *counter, u8 ev_mode) { … } static void ecap_cnt_capture_enable(struct counter_device *counter) { … } static void ecap_cnt_capture_disable(struct counter_device *counter) { … } static u32 ecap_cnt_count_get_val(struct counter_device *counter, unsigned int reg) { … } static void ecap_cnt_count_set_val(struct counter_device *counter, unsigned int reg, u32 val) { … } static int ecap_cnt_count_read(struct counter_device *counter, struct counter_count *count, u64 *val) { … } static int ecap_cnt_count_write(struct counter_device *counter, struct counter_count *count, u64 val) { … } static int ecap_cnt_function_read(struct counter_device *counter, struct counter_count *count, enum counter_function *function) { … } static int ecap_cnt_action_read(struct counter_device *counter, struct counter_count *count, struct counter_synapse *synapse, enum counter_synapse_action *action) { … } static int ecap_cnt_watch_validate(struct counter_device *counter, const struct counter_watch *watch) { … } static int ecap_cnt_clk_get_freq(struct counter_device *counter, struct counter_signal *signal, u64 *freq) { … } static int ecap_cnt_pol_read(struct counter_device *counter, struct counter_signal *signal, size_t idx, enum counter_signal_polarity *pol) { … } static int ecap_cnt_pol_write(struct counter_device *counter, struct counter_signal *signal, size_t idx, enum counter_signal_polarity pol) { … } static int ecap_cnt_cap_read(struct counter_device *counter, struct counter_count *count, size_t idx, u64 *cap) { … } static int ecap_cnt_cap_write(struct counter_device *counter, struct counter_count *count, size_t idx, u64 cap) { … } static int ecap_cnt_nb_ovf_read(struct counter_device *counter, struct counter_count *count, u64 *val) { … } static int ecap_cnt_nb_ovf_write(struct counter_device *counter, struct counter_count *count, u64 val) { … } static int ecap_cnt_ceiling_read(struct counter_device *counter, struct counter_count *count, u64 *val) { … } static int ecap_cnt_enable_read(struct counter_device *counter, struct counter_count *count, u8 *enable) { … } static int ecap_cnt_enable_write(struct counter_device *counter, struct counter_count *count, u8 enable) { … } static const struct counter_ops ecap_cnt_ops = …; static const enum counter_function ecap_cnt_functions[] = …; static const enum counter_synapse_action ecap_cnt_clock_actions[] = …; static const enum counter_synapse_action ecap_cnt_input_actions[] = …; static struct counter_comp ecap_cnt_clock_ext[] = …; static const enum counter_signal_polarity ecap_cnt_pol_avail[] = …; static DEFINE_COUNTER_AVAILABLE(ecap_cnt_pol_available, ecap_cnt_pol_avail); static DEFINE_COUNTER_ARRAY_POLARITY(ecap_cnt_pol_array, ecap_cnt_pol_available, ECAP_NB_CEVT); static struct counter_comp ecap_cnt_signal_ext[] = …; static struct counter_signal ecap_cnt_signals[] = …; static struct counter_synapse ecap_cnt_synapses[] = …; static DEFINE_COUNTER_ARRAY_CAPTURE(ecap_cnt_cap_array, ECAP_NB_CEVT); static struct counter_comp ecap_cnt_count_ext[] = …; static struct counter_count ecap_cnt_counts[] = …; static irqreturn_t ecap_cnt_isr(int irq, void *dev_id) { … } static void ecap_cnt_pm_disable(void *dev) { … } static int ecap_cnt_probe(struct platform_device *pdev) { … } static void ecap_cnt_remove(struct platform_device *pdev) { … } static int ecap_cnt_suspend(struct device *dev) { … } static int ecap_cnt_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(ecap_cnt_pm_ops, ecap_cnt_suspend, ecap_cnt_resume); static const struct of_device_id ecap_cnt_of_match[] = …; MODULE_DEVICE_TABLE(of, ecap_cnt_of_match); static struct platform_driver ecap_cnt_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_IMPORT_NS(…);
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