// SPDX-License-Identifier: GPL-2.0 /* * Pistachio clocksource based on general-purpose timers * * Copyright (C) 2015 Imagination Technologies */ #define pr_fmt(fmt) … #include <linux/clk.h> #include <linux/clocksource.h> #include <linux/clockchips.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/init.h> #include <linux/spinlock.h> #include <linux/mfd/syscon.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/sched_clock.h> #include <linux/time.h> /* Top level reg */ #define CR_TIMER_CTRL_CFG … #define TIMER_ME_GLOBAL … #define CR_TIMER_REV … /* Timer specific registers */ #define TIMER_CFG … #define TIMER_ME_LOCAL … #define TIMER_RELOAD_VALUE … #define TIMER_CURRENT_VALUE … #define TIMER_CURRENT_OVERFLOW_VALUE … #define TIMER_IRQ_STATUS … #define TIMER_IRQ_CLEAR … #define TIMER_IRQ_MASK … #define PERIP_TIMER_CONTROL … /* Timer specific configuration Values */ #define RELOAD_VALUE … struct pistachio_clocksource { … }; static struct pistachio_clocksource pcs_gpt; #define to_pistachio_clocksource(cs) … static inline u32 gpt_readl(void __iomem *base, u32 offset, u32 gpt_id) { … } static inline void gpt_writel(void __iomem *base, u32 value, u32 offset, u32 gpt_id) { … } static u64 notrace pistachio_clocksource_read_cycles(struct clocksource *cs) { … } static u64 notrace pistachio_read_sched_clock(void) { … } static void pistachio_clksrc_set_mode(struct clocksource *cs, int timeridx, int enable) { … } static void pistachio_clksrc_enable(struct clocksource *cs, int timeridx) { … } static void pistachio_clksrc_disable(struct clocksource *cs, int timeridx) { … } static int pistachio_clocksource_enable(struct clocksource *cs) { … } static void pistachio_clocksource_disable(struct clocksource *cs) { … } /* Desirable clock source for pistachio platform */ static struct pistachio_clocksource pcs_gpt = …; static int __init pistachio_clksrc_of_init(struct device_node *node) { … } TIMER_OF_DECLARE(pistachio_gptimer, "img,pistachio-gptimer", pistachio_clksrc_of_init);
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