// SPDX-License-Identifier: GPL-2.0-only /* * TI DaVinci clocksource driver * * Copyright (C) 2019 Texas Instruments * Author: Bartosz Golaszewski <[email protected]> * (with tiny parts adopted from code by Kevin Hilman <[email protected]>) */ #define pr_fmt(fmt) … #include <linux/clk.h> #include <linux/clockchips.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/sched_clock.h> #include <clocksource/timer-davinci.h> #define DAVINCI_TIMER_REG_TIM12 … #define DAVINCI_TIMER_REG_TIM34 … #define DAVINCI_TIMER_REG_PRD12 … #define DAVINCI_TIMER_REG_PRD34 … #define DAVINCI_TIMER_REG_TCR … #define DAVINCI_TIMER_REG_TGCR … #define DAVINCI_TIMER_TIMMODE_MASK … #define DAVINCI_TIMER_RESET_MASK … #define DAVINCI_TIMER_TIMMODE_32BIT_UNCHAINED … #define DAVINCI_TIMER_UNRESET … #define DAVINCI_TIMER_ENAMODE_MASK … #define DAVINCI_TIMER_ENAMODE_DISABLED … #define DAVINCI_TIMER_ENAMODE_ONESHOT … #define DAVINCI_TIMER_ENAMODE_PERIODIC … #define DAVINCI_TIMER_ENAMODE_SHIFT_TIM12 … #define DAVINCI_TIMER_ENAMODE_SHIFT_TIM34 … #define DAVINCI_TIMER_MIN_DELTA … #define DAVINCI_TIMER_MAX_DELTA … #define DAVINCI_TIMER_CLKSRC_BITS … #define DAVINCI_TIMER_TGCR_DEFAULT … struct davinci_clockevent { … }; /* * This must be globally accessible by davinci_timer_read_sched_clock(), so * let's keep it here. */ static struct { … } davinci_clocksource; static struct davinci_clockevent * to_davinci_clockevent(struct clock_event_device *clockevent) { … } static unsigned int davinci_clockevent_read(struct davinci_clockevent *clockevent, unsigned int reg) { … } static void davinci_clockevent_write(struct davinci_clockevent *clockevent, unsigned int reg, unsigned int val) { … } static void davinci_tim12_shutdown(void __iomem *base) { … } static void davinci_tim12_set_oneshot(void __iomem *base) { … } static int davinci_clockevent_shutdown(struct clock_event_device *dev) { … } static int davinci_clockevent_set_oneshot(struct clock_event_device *dev) { … } static int davinci_clockevent_set_next_event_std(unsigned long cycles, struct clock_event_device *dev) { … } static int davinci_clockevent_set_next_event_cmp(unsigned long cycles, struct clock_event_device *dev) { … } static irqreturn_t davinci_timer_irq_timer(int irq, void *data) { … } static u64 notrace davinci_timer_read_sched_clock(void) { … } static u64 davinci_clocksource_read(struct clocksource *dev) { … } /* * Standard use-case: we're using tim12 for clockevent and tim34 for * clocksource. The default is making the former run in oneshot mode * and the latter in periodic mode. */ static void davinci_clocksource_init_tim34(void __iomem *base) { … } /* * Special use-case on da830: the DSP may use tim34. We're using tim12 for * both clocksource and clockevent. We set tim12 to periodic and don't touch * tim34. */ static void davinci_clocksource_init_tim12(void __iomem *base) { … } static void davinci_timer_init(void __iomem *base) { … } int __init davinci_timer_register(struct clk *clk, const struct davinci_timer_cfg *timer_cfg) { … } static int __init of_davinci_timer_register(struct device_node *np) { … } TIMER_OF_DECLARE(davinci_timer, "ti,da830-timer", of_davinci_timer_register);
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