// SPDX-License-Identifier: GPL-2.0 /* * Intel 8254 Programmable Interval Timer * Copyright (C) William Breathitt Gray */ #include <linux/bitfield.h> #include <linux/bits.h> #include <linux/counter.h> #include <linux/device.h> #include <linux/err.h> #include <linux/export.h> #include <linux/i8254.h> #include <linux/limits.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/regmap.h> #include <asm/unaligned.h> #define I8254_COUNTER_REG(_counter) … #define I8254_CONTROL_REG … #define I8254_SC … #define I8254_RW … #define I8254_M … #define I8254_CONTROL(_sc, _rw, _m) … #define I8254_RW_TWO_BYTE … #define I8254_MODE_INTERRUPT_ON_TERMINAL_COUNT … #define I8254_MODE_HARDWARE_RETRIGGERABLE_ONESHOT … #define I8254_MODE_RATE_GENERATOR … #define I8254_MODE_SQUARE_WAVE_MODE … #define I8254_MODE_SOFTWARE_TRIGGERED_STROBE … #define I8254_MODE_HARDWARE_TRIGGERED_STROBE … #define I8254_COUNTER_LATCH(_counter) … #define I8254_PROGRAM_COUNTER(_counter, _mode) … #define I8254_NUM_COUNTERS … /** * struct i8254 - I8254 device private data structure * @lock: synchronization lock to prevent I/O race conditions * @preset: array of Counter Register states * @out_mode: array of mode configuration states * @map: Regmap for the device */ struct i8254 { … }; static int i8254_count_read(struct counter_device *const counter, struct counter_count *const count, u64 *const val) { … } static int i8254_function_read(struct counter_device *const counter, struct counter_count *const count, enum counter_function *const function) { … } #define I8254_SYNAPSES_PER_COUNT … #define I8254_SIGNAL_ID_CLK … #define I8254_SIGNAL_ID_GATE … static int i8254_action_read(struct counter_device *const counter, struct counter_count *const count, struct counter_synapse *const synapse, enum counter_synapse_action *const action) { … } static int i8254_count_ceiling_read(struct counter_device *const counter, struct counter_count *const count, u64 *const ceiling) { … } static int i8254_count_mode_read(struct counter_device *const counter, struct counter_count *const count, enum counter_count_mode *const count_mode) { … } static int i8254_count_mode_write(struct counter_device *const counter, struct counter_count *const count, const enum counter_count_mode count_mode) { … } static int i8254_count_floor_read(struct counter_device *const counter, struct counter_count *const count, u64 *const floor) { … } static int i8254_count_preset_read(struct counter_device *const counter, struct counter_count *const count, u64 *const preset) { … } static int i8254_count_preset_write(struct counter_device *const counter, struct counter_count *const count, const u64 preset) { … } static int i8254_init_hw(struct regmap *const map) { … } static const struct counter_ops i8254_ops = …; #define I8254_SIGNAL(_id, _name) … static struct counter_signal i8254_signals[] = …; static const enum counter_synapse_action i8254_clk_actions[] = …; static const enum counter_synapse_action i8254_gate_actions[] = …; #define I8254_SYNAPSES_BASE(_id) … #define I8254_SYNAPSE_CLK(_id) … #define I8254_SYNAPSE_GATE(_id) … static struct counter_synapse i8254_synapses[] = …; static const enum counter_function i8254_functions_list[] = …; static const enum counter_count_mode i8254_count_modes[] = …; static DEFINE_COUNTER_AVAILABLE(i8254_count_modes_available, i8254_count_modes); static struct counter_comp i8254_count_ext[] = …; #define I8254_COUNT(_id, _name) … static struct counter_count i8254_counts[I8254_NUM_COUNTERS] = …; /** * devm_i8254_regmap_register - Register an i8254 Counter device * @dev: device that is registering this i8254 Counter device * @config: configuration for i8254_regmap_config * * Registers an Intel 8254 Programmable Interval Timer Counter device. Returns 0 on success and * negative error number on failure. */ int devm_i8254_regmap_register(struct device *const dev, const struct i8254_regmap_config *const config) { … } EXPORT_SYMBOL_NS_GPL(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_IMPORT_NS(…);
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