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Message-ID: <01824dab-ed75-973a-c1bc-562a1a9370a1@starfivetech.com>
Date:   Tue, 17 Jan 2023 14:39:55 +0800
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Subject: Re: [PATCH v1 2/3] clocksource: Add StarFive timer driver
Content-Language: en-US
To:     <linux-riscv@lists.infradead.org>, <devicetree@vger.kernel.org>,
        "Daniel Lezcano" <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
CC:     Rob Herring <robh+dt@kernel.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Samin Guo <samin.guo@starfivetech.com>,
        <linux-kernel@vger.kernel.org>
References: <20221223094801.181315-1-xingyu.wu@starfivetech.com>
 <20221223094801.181315-3-xingyu.wu@starfivetech.com>
From:   Xingyu Wu <xingyu.wu@starfivetech.com>
In-Reply-To: <20221223094801.181315-3-xingyu.wu@starfivetech.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 2022/12/23 17:48, Xingyu Wu wrote:
> Add timer driver for the StarFive JH7110 SoC.
> 
> Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com>
> ---
>  MAINTAINERS                          |   7 +
>  drivers/clocksource/Kconfig          |  12 +
>  drivers/clocksource/Makefile         |   1 +
>  drivers/clocksource/timer-starfive.c | 465 +++++++++++++++++++++++++++
>  drivers/clocksource/timer-starfive.h | 104 ++++++
>  5 files changed, 589 insertions(+)
>  create mode 100644 drivers/clocksource/timer-starfive.c
>  create mode 100644 drivers/clocksource/timer-starfive.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index a70c1d0f303e..340ad9e0a31f 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19623,6 +19623,13 @@ F:	Documentation/devicetree/bindings/reset/starfive,jh7100-reset.yaml
>  F:	drivers/reset/starfive/
>  F:	include/dt-bindings/reset/starfive*
>  
> +STARFIVE TIMER DRIVER
> +M:	Samin Guo <samin.guo@starfivetech.com>
> +M:	Xingyu Wu <xingyu.wu@starfivetech.com>
> +S:	Supported
> +F:	Documentation/devicetree/bindings/timer/starfive*
> +F:	drivers/clocksource/timer-starfive*
> +
>  STATIC BRANCH/CALL
>  M:	Peter Zijlstra <peterz@infradead.org>
>  M:	Josh Poimboeuf <jpoimboe@kernel.org>
> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> index 4469e7f555e9..11400b3a8f5c 100644
> --- a/drivers/clocksource/Kconfig
> +++ b/drivers/clocksource/Kconfig
> @@ -630,6 +630,18 @@ config RISCV_TIMER
>  	  is accessed via both the SBI and the rdcycle instruction.  This is
>  	  required for all RISC-V systems.
>  
> +config STARFIVE_TIMER
> +	bool "Timer for the STARFIVE SoCs"
> +	depends on RISCV && OF && (SOC_STARFIVE || COMPILE_TEST)
> +	select TIMER_OF
> +	select CLKSRC_MMIO
> +	default SOC_STARFIVE
> +	help
> +	  This enables the timers for StarFive SoCs. On RISC-V platform,
> +	  the system has started RISCV_TIMER. But you can also use these timers
> +	  to do a lot more on StarFive SoCs. These timers can provide much
> +	  higher precision than RISCV_TIMER.
> +
>  config CLINT_TIMER
>  	bool "CLINT Timer for the RISC-V platform" if COMPILE_TEST
>  	depends on GENERIC_SCHED_CLOCK && RISCV
> diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
> index 64ab547de97b..276695d95cdc 100644
> --- a/drivers/clocksource/Makefile
> +++ b/drivers/clocksource/Makefile
> @@ -80,6 +80,7 @@ obj-$(CONFIG_INGENIC_TIMER)		+= ingenic-timer.o
>  obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
>  obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
>  obj-$(CONFIG_RISCV_TIMER)		+= timer-riscv.o
> +obj-$(CONFIG_STARFIVE_TIMER)		+= timer-starfive.o
>  obj-$(CONFIG_CLINT_TIMER)		+= timer-clint.o
>  obj-$(CONFIG_CSKY_MP_TIMER)		+= timer-mp-csky.o
>  obj-$(CONFIG_GX6605S_TIMER)		+= timer-gx6605s.o
> diff --git a/drivers/clocksource/timer-starfive.c b/drivers/clocksource/timer-starfive.c
> new file mode 100644
> index 000000000000..8db413a22fdc
> --- /dev/null
> +++ b/drivers/clocksource/timer-starfive.c
> @@ -0,0 +1,465 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Starfive Timer driver
> + *
> + * Copyright (C) 2022 StarFive Technology Co., Ltd.
> + *
> + * Author:
> + * Xingyu Wu <xingyu.wu@starfivetech.com>
> + * Samin Guo <samin.guo@starfivetech.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clockchips.h>
> +#include <linux/clocksource.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_clk.h>
> +#include <linux/of_irq.h>
> +#include <linux/reset.h>
> +#include <linux/sched_clock.h>
> +
> +#include "timer-starfive.h"
> +
> +struct starfive_timer __initdata starfive_timer_jh7110 = {
> +	.ctrl		= STARFIVE_TIMER_JH7110_CTL,
> +	.load		= STARFIVE_TIMER_JH7110_LOAD,
> +	.enable		= STARFIVE_TIMER_JH7110_ENABLE,
> +	.reload		= STARFIVE_TIMER_JH7110_RELOAD,
> +	.value		= STARFIVE_TIMER_JH7110_VALUE,
> +	.intclr		= STARFIVE_TIMER_JH7110_INT_CLR,
> +	.intmask	= STARFIVE_TIMER_JH7110_INT_MASK,
> +	.timer_base	= {STARFIVE_TIMER_BASE(0), STARFIVE_TIMER_BASE(1),
> +			   STARFIVE_TIMER_BASE(2), STARFIVE_TIMER_BASE(3)},
> +};
> +
> +static inline struct starfive_clkevt *to_starfive_clkevt(struct clock_event_device *evt)
> +{
> +	return container_of(evt, struct starfive_clkevt, evt);
> +}
> +
> +/* 0:continuous-run mode, 1:single-run mode */
> +static inline void starfive_timer_set_mod(struct starfive_clkevt *clkevt, int mod)
> +{
> +	writel(mod, clkevt->ctrl);
> +}
> +
> +/* Interrupt Mask Register, 0:Unmask, 1:Mask */
> +static inline void starfive_timer_int_enable(struct starfive_clkevt *clkevt)
> +{
> +	writel(INTMASK_ENABLE_DIS, clkevt->intmask);
> +}
> +
> +static inline void starfive_timer_int_disable(struct starfive_clkevt *clkevt)
> +{
> +	writel(INTMASK_ENABLE, clkevt->intmask);
> +}
> +
> +/*
> + * BIT(0): Read value represent channel intr status.
> + * Write 1 to this bit to clear interrupt. Write 0 has no effects.
> + * BIT(1): "1" means that it is clearing interrupt. BIT(0) can not be written.
> + */
> +static inline void starfive_timer_int_clear(struct starfive_clkevt *clkevt)
> +{
> +	/* waiting interrupt can be to clearing */
> +	u32 value;
> +	int ret = 0;
> +
> +	value = readl(clkevt->intclr);
> +	ret = readl_poll_timeout_atomic(clkevt->intclr, value,
> +					!(value & STARFIVE_TIMER_JH7110_INT_STATUS_CLR_AVA),
> +					STARFIVE_DELAY_US, STARFIVE_TIMEOUT_US);
> +	if (!ret)
> +		writel(1, clkevt->intclr);
> +}
> +
> +/*
> + * The initial value to be loaded into the
> + * counter and is also used as the reload value.
> + */
> +static inline void starfive_timer_set_load(struct starfive_clkevt *clkevt, u32 val)
> +{
> +	writel(val, clkevt->load);
> +}
> +
> +static inline u32 starfive_timer_get_val(struct starfive_clkevt *clkevt)
> +{
> +	return readl(clkevt->value);
> +}
> +
> +/*
> + * Write RELOAD register to reload preset value to counter.
> + * (Write 0 and write 1 are both ok)
> + */
> +static inline void starfive_timer_set_reload(struct starfive_clkevt *clkevt)
> +{
> +	writel(1, clkevt->reload);
> +}
> +
> +static inline void starfive_timer_enable(struct starfive_clkevt *clkevt)
> +{
> +	writel(TIMER_ENA, clkevt->enable);
> +}
> +
> +static inline void starfive_timer_disable(struct starfive_clkevt *clkevt)
> +{
> +	writel(TIMER_ENA_DIS, clkevt->enable);
> +}
> +
> +static void timer_shutdown(struct starfive_clkevt *clkevt)
> +{
> +	starfive_timer_int_disable(clkevt);
> +	starfive_timer_disable(clkevt);
> +	starfive_timer_int_clear(clkevt);
> +}
> +
> +static void starfive_timer_suspend(struct clock_event_device *evt)
> +{
> +	struct starfive_clkevt *clkevt = to_starfive_clkevt(evt);
> +
> +	clkevt->reload_val = starfive_timer_get_val(clkevt);
> +
> +	starfive_timer_disable(clkevt);
> +	starfive_timer_int_disable(clkevt);
> +	starfive_timer_int_clear(clkevt);
> +}
> +
> +static void starfive_timer_resume(struct clock_event_device *evt)
> +{
> +	struct starfive_clkevt *clkevt = to_starfive_clkevt(evt);
> +
> +	starfive_timer_set_load(clkevt, clkevt->reload_val);
> +	starfive_timer_set_reload(clkevt);
> +	starfive_timer_int_enable(clkevt);
> +	starfive_timer_enable(clkevt);
> +}
> +
> +static int starfive_timer_tick_resume(struct clock_event_device *evt)
> +{
> +	starfive_timer_resume(evt);
> +
> +	return 0;
> +}
> +
> +static int starfive_timer_shutdown(struct clock_event_device *evt)
> +{
> +	struct starfive_clkevt *clkevt = to_starfive_clkevt(evt);
> +
> +	timer_shutdown(clkevt);
> +
> +	return 0;
> +}
> +
> +static int starfive_get_clock_rate(struct starfive_clkevt *clkevt, struct device_node *np)
> +{
> +	int ret;
> +	u32 rate;
> +
> +	if (clkevt->clk) {
> +		clkevt->rate = clk_get_rate(clkevt->clk);
> +		if (clkevt->rate > 0) {
> +			pr_debug("clk_get_rate clkevt->rate: %d\n", clkevt->rate);
> +			return 0;
> +		}
> +	}
> +
> +	/* Next we try to get clock-frequency from dts.*/
> +	ret = of_property_read_u32(np, "clock-frequency", &rate);
> +	if (!ret) {
> +		pr_debug("Timer: try get clock-frequency:%d Hz\n", rate);
> +		clkevt->rate = rate;
> +		return 0;
> +	}
> +	pr_err("Timer: get rate failed, need clock-frequency define in dts.\n");
> +
> +	return -ENOENT;
> +}
> +
> +static int starfive_clocksource_init(struct starfive_clkevt *clkevt,
> +				     const char *name, struct device_node *np)
> +{
> +	starfive_timer_set_mod(clkevt, MOD_CONTIN);
> +	starfive_timer_set_load(clkevt, STARFIVE_MAX_TICKS);  /* val = rate --> 1s */
> +	starfive_timer_int_disable(clkevt);
> +	starfive_timer_int_clear(clkevt);
> +	starfive_timer_int_enable(clkevt);
> +	starfive_timer_enable(clkevt);
> +
> +	return clocksource_mmio_init(clkevt->value, name, clkevt->rate,
> +				     STARFIVE_CLOCK_SOURCE_RATING, STARFIVE_VALID_BITS,
> +				     clocksource_mmio_readl_down);
> +}
> +
> +/*
> + * IRQ handler for the timer
> + */
> +static irqreturn_t starfive_timer_interrupt(int irq, void *priv)
> +{
> +	struct clock_event_device *evt = (struct clock_event_device *)priv;
> +	struct starfive_clkevt *clkevt = to_starfive_clkevt(evt);
> +
> +	starfive_timer_int_clear(clkevt);
> +
> +	if (evt->event_handler)
> +		evt->event_handler(evt);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int starfive_timer_set_periodic(struct clock_event_device *evt)
> +{
> +	struct starfive_clkevt *clkevt = to_starfive_clkevt(evt);
> +
> +	starfive_timer_disable(clkevt);
> +	starfive_timer_set_mod(clkevt, MOD_CONTIN);
> +	starfive_timer_set_load(clkevt, clkevt->periodic);
> +	starfive_timer_int_disable(clkevt);
> +	starfive_timer_int_clear(clkevt);
> +	starfive_timer_int_enable(clkevt);
> +	starfive_timer_enable(clkevt);
> +
> +	return 0;
> +}
> +
> +static int starfive_timer_set_oneshot(struct clock_event_device *evt)
> +{
> +	struct starfive_clkevt *clkevt = to_starfive_clkevt(evt);
> +
> +	starfive_timer_disable(clkevt);
> +	starfive_timer_set_mod(clkevt, MOD_SINGLE);
> +	starfive_timer_set_load(clkevt, STARFIVE_MAX_TICKS);
> +	starfive_timer_int_disable(clkevt);
> +	starfive_timer_int_clear(clkevt);
> +	starfive_timer_int_enable(clkevt);
> +	starfive_timer_enable(clkevt);
> +
> +	return 0;
> +}
> +
> +static int starfive_timer_set_next_event(unsigned long next,
> +					 struct clock_event_device *evt)
> +{
> +	struct starfive_clkevt *clkevt = to_starfive_clkevt(evt);
> +
> +	starfive_timer_disable(clkevt);
> +	starfive_timer_set_mod(clkevt, MOD_SINGLE);
> +	starfive_timer_set_load(clkevt, next);
> +	starfive_timer_enable(clkevt);
> +
> +	return 0;
> +}
> +
> +static void starfive_set_clockevent(struct clock_event_device *evt)
> +{
> +	evt->features	= CLOCK_EVT_FEAT_PERIODIC |
> +			  CLOCK_EVT_FEAT_ONESHOT |
> +			  CLOCK_EVT_FEAT_DYNIRQ;
> +	evt->set_state_shutdown	= starfive_timer_shutdown;
> +	evt->set_state_periodic	= starfive_timer_set_periodic;
> +	evt->set_state_oneshot	= starfive_timer_set_oneshot;
> +	evt->set_state_oneshot_stopped = starfive_timer_shutdown;
> +	evt->tick_resume	= starfive_timer_tick_resume;
> +	evt->set_next_event	= starfive_timer_set_next_event;
> +	evt->suspend		= starfive_timer_suspend;
> +	evt->resume		= starfive_timer_resume;
> +	evt->rating		= STARFIVE_CLOCKEVENT_RATING;
> +}
> +
> +static int starfive_clockevents_register(struct starfive_clkevt *clkevt, unsigned int irq,
> +					 struct device_node *np, const char *name)
> +{
> +	int ret = 0;
> +
> +	ret = starfive_get_clock_rate(clkevt, np);
> +	if (ret)
> +		return -EINVAL;
> +
> +	clkevt->periodic = DIV_ROUND_CLOSEST(clkevt->rate, HZ);
> +
> +	starfive_set_clockevent(&clkevt->evt);
> +	clkevt->evt.name = name;
> +	clkevt->evt.irq = irq;
> +	clkevt->evt.cpumask = cpu_possible_mask;
> +
> +	ret = request_irq(irq, starfive_timer_interrupt,
> +			  IRQF_TIMER | IRQF_IRQPOLL, name, &clkevt->evt);
> +	if (ret)
> +		pr_err("%s: request_irq failed\n", name);
> +
> +	clockevents_config_and_register(&clkevt->evt, clkevt->rate,
> +					STARFIVE_MIN_TICKS, STARFIVE_MAX_TICKS);
> +
> +	return ret;
> +}
> +
> +static void __init starfive_clkevt_base_init(struct starfive_timer *timer,
> +					     struct starfive_clkevt *clkevt,
> +					     void __iomem *base, int index)
> +{
> +	void __iomem *timer_base;
> +
> +	timer_base	= base + timer->timer_base[index];
> +	clkevt->base	= timer_base;
> +	clkevt->ctrl	= timer_base + timer->ctrl;
> +	clkevt->load	= timer_base + timer->load;
> +	clkevt->enable	= timer_base + timer->enable;
> +	clkevt->reload	= timer_base + timer->reload;
> +	clkevt->value	= timer_base + timer->value;
> +	clkevt->intclr	= timer_base + timer->intclr;
> +	clkevt->intmask	= timer_base + timer->intmask;
> +}
> +
> +static int __init starfive_timer_jh7110_of_init(struct device_node *np)
> +{
> +	int index, count, irq, ret;
> +	const char *name = NULL;
> +	struct clk *clk;
> +	struct clk *pclk;
> +	struct reset_control *prst;
> +	struct reset_control *rst;
> +	struct starfive_clkevt *clkevt[STARFIVE_NR_TIMERS];
> +	void __iomem *base;
> +	struct starfive_timer *timer = &starfive_timer_jh7110;
> +
> +	base = of_iomap(np, 0);
> +	if (!base)
> +		return -ENXIO;
> +
> +	if (!of_device_is_available(np)) {
> +		ret = -EINVAL;
> +		goto err;
> +	}
> +
> +	pclk = of_clk_get_by_name(np, "apb");
> +	if (!IS_ERR(pclk)) {
> +		if (clk_prepare_enable(pclk))
> +			pr_warn("pclk for %pOFn is present, but could not be activated\n", np);
> +	/*
> +	 * Clock framework support is late, continue on
> +	 * anyways if we don't find a matching clock.
> +	 */
> +	} else if (PTR_ERR(pclk) != -EPROBE_DEFER) {
> +		ret = PTR_ERR(pclk);
> +		goto err;
> +	}
> +
> +	prst = of_reset_control_get(np, "apb");
> +	if (!IS_ERR(prst)) {
> +		ret = reset_control_deassert(prst);
> +		if (ret)
> +			goto prst_err;
> +	/*
> +	 * Reset framework support is late, continue on
> +	 * anyways if we don't find a matching reset.
> +	 */
> +	} else if (PTR_ERR(prst) != -EPROBE_DEFER) {
> +		ret = PTR_ERR(prst);
> +		goto prst_err;
> +	}
> +
> +	/* The number of timers used is determined according to the device tree. */
> +	count = of_irq_count(np);
> +	if (count > STARFIVE_NR_TIMERS || count <= 0) {
> +		ret = -EINVAL;
> +		goto count_err;
> +	}
> +
> +	for (index = 0; index < count; index++) {
> +		of_property_read_string_index(np, "clock-names", index, &name);
> +		if (strncmp(name, "timer", strlen("timer")))
> +			continue;
> +
> +		clkevt[index] = kzalloc(sizeof(*clkevt[index]), GFP_KERNEL);
> +		if (!clkevt[index]) {
> +			ret = -ENOMEM;
> +			goto clkevt_err;
> +		}
> +
> +		starfive_clkevt_base_init(timer, clkevt[index], base, index);
> +
> +		/* Ensure timers are disabled */
> +		starfive_timer_disable(clkevt[index]);
> +
> +		clk = of_clk_get_by_name(np, name);
> +		if (!IS_ERR(clk)) {
> +			clkevt[index]->clk = clk;
> +			if (clk_prepare_enable(clkevt[index]->clk))
> +				pr_warn("clk for %pOFn is present, but could not be activated\n",
> +					np);
> +		} else if (PTR_ERR(clk) != -EPROBE_DEFER) {
> +			ret = PTR_ERR(clk);
> +			goto clk_err;
> +		}
> +
> +		rst = of_reset_control_get(np, name);
> +		if (!IS_ERR(rst)) {
> +			clkevt[index]->rst = rst;
> +			ret = reset_control_deassert(clkevt[index]->rst);
> +			if (ret)
> +				goto rst_err;
> +		}
> +
> +		irq = irq_of_parse_and_map(np, index);
> +		if (irq < 0) {
> +			ret = -EINVAL;
> +			goto irq_err;
> +		}
> +
> +		snprintf(clkevt[index]->name, sizeof(clkevt[index]->name), "%s.ch%d",
> +			 np->full_name, index);
> +
> +		ret = starfive_clockevents_register(clkevt[index], irq, np, clkevt[index]->name);
> +		if (ret) {
> +			pr_err("%s: init clockevents failed.\n", clkevt[index]->name);
> +			goto register_err;
> +		}
> +		clkevt[index]->irq = irq;
> +
> +		ret = starfive_clocksource_init(clkevt[index], clkevt[index]->name, np);
> +		if (ret)
> +			goto init_err;
> +	}
> +	if (!IS_ERR(pclk))
> +		clk_put(pclk);
> +
> +	return 0;
> +
> +init_err:
> +register_err:
> +	free_irq(clkevt[index]->irq, &clkevt[index]->evt);
> +irq_err:
> +rst_err:
> +clk_err:
> +	/* Only unregister the failed timer and the rest timers continue to work. */
> +	if (!clkevt[index]->rst) {
> +		reset_control_assert(clkevt[index]->rst);
> +		reset_control_put(clkevt[index]->rst);
> +	}
> +	if (!clkevt[index]->clk) {
> +		clk_disable_unprepare(clkevt[index]->clk);
> +		clk_put(clkevt[index]->clk);
> +	}
> +	kfree(clkevt[index]);
> +clkevt_err:
> +count_err:
> +prst_err:
> +	if (!IS_ERR(pclk)) {
> +		/* If no other timer successfully registers, pclk is disabled. */
> +		if (!index)
> +			clk_disable_unprepare(pclk);
> +		clk_put(pclk);
> +	}
> +err:
> +	iounmap(base);
> +	return ret;
> +}
> +
> +TIMER_OF_DECLARE(starfive_timer_jh7110, "starfive,jh7110-timers", starfive_timer_jh7110_of_init);
> diff --git a/drivers/clocksource/timer-starfive.h b/drivers/clocksource/timer-starfive.h
> new file mode 100644
> index 000000000000..9fd3303b31d1
> --- /dev/null
> +++ b/drivers/clocksource/timer-starfive.h
> @@ -0,0 +1,104 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2022 StarFive Technology Co., Ltd.
> + */
> +
> +#ifndef __STARFIVE_TIMER_H__
> +#define __STARFIVE_TIMER_H__
> +
> +#define STARFIVE_NR_TIMERS		TIMERS_MAX
> +/* Bias: Timer0-0x0, Timer1-0x40, Timer2-0x80, and so on. */
> +#define STARFIVE_PER_TIMER_LEN		0x40
> +#define STARFIVE_TIMER_BASE(x)		((TIMER_##x) * STARFIVE_PER_TIMER_LEN)
> +
> +#define STARFIVE_CLOCK_SOURCE_RATING	200
> +#define STARFIVE_VALID_BITS		32
> +#define STARFIVE_DELAY_US		0
> +#define STARFIVE_TIMEOUT_US		10000
> +#define STARFIVE_CLOCKEVENT_RATING	300
> +#define STARFIVE_MAX_TICKS		0xffffffff
> +#define STARFIVE_MIN_TICKS		0xf
> +
> +/*
> + * JH7110 timer TIMER_INT_STATUS:
> + * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> + * |     Bits     | 08~31 | 7 | 6 | 5 |  4  | 3 | 2 | 1 | 0 |
> + * ----------------------------------------------------------
> + * | timer(n)_int |  res  | 6 | 5 | 4 | Wdt | 3 | 2 | 1 | 0 |
> + * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> + *
> + * Software can read this register to know which interrupt is occurred.
> + */
> +#define STARFIVE_TIMER_JH7110_INT_STATUS	0x00
> +#define STARFIVE_TIMER_JH7110_CTL		0x04
> +#define STARFIVE_TIMER_JH7110_LOAD		0x08
> +#define STARFIVE_TIMER_JH7110_ENABLE		0x10
> +#define STARFIVE_TIMER_JH7110_RELOAD		0x14
> +#define STARFIVE_TIMER_JH7110_VALUE		0x18
> +#define STARFIVE_TIMER_JH7110_INT_CLR		0x20
> +#define STARFIVE_TIMER_JH7110_INT_MASK		0x24
> +#define STARFIVE_TIMER_JH7110_INT_STATUS_CLR_AVA	BIT(1)
> +
> +enum STARFIVE_TIMERS {
> +	TIMER_0 = 0,
> +	TIMER_1,
> +	TIMER_2,
> +	TIMER_3,
> +	TIMER_4,  /*WDT*/
> +	TIMER_5,
> +	TIMER_6,
> +	TIMER_7,
> +	TIMERS_MAX
> +};
> +
> +enum TIMERI_INTMASK {
> +	INTMASK_ENABLE_DIS = 0,
> +	INTMASK_ENABLE = 1
> +};
> +
> +enum TIMER_MOD {
> +	MOD_CONTIN = 0,
> +	MOD_SINGLE = 1
> +};
> +
> +enum TIMER_CTL_EN {
> +	TIMER_ENA_DIS	= 0,
> +	TIMER_ENA	= 1
> +};
> +
> +enum {
> +	INT_CLR_AVAILABLE = 0,
> +	INT_CLR_NOT_AVAILABLE = 1
> +};
> +
> +struct starfive_timer {
> +	u32 ctrl;
> +	u32 load;
> +	u32 enable;
> +	u32 reload;
> +	u32 value;
> +	u32 intclr;
> +	u32 intmask;
> +	u32 wdt_lock;   /* 0x3c+i*0x40 watchdog use ONLY */
> +	u32 timer_base[STARFIVE_NR_TIMERS];
> +};
> +
> +struct starfive_clkevt {
> +	struct clock_event_device evt;
> +	struct clk *clk;
> +	struct reset_control *rst;
> +	char name[20];
> +	int irq;
> +	u32 periodic;
> +	u32 rate;
> +	u32 reload_val;
> +	void __iomem *base;
> +	void __iomem *ctrl;
> +	void __iomem *load;
> +	void __iomem *enable;
> +	void __iomem *reload;
> +	void __iomem *value;
> +	void __iomem *intclr;
> +	void __iomem *intmask;
> +};
> +#endif /* __STARFIVE_TIMER_H__ */

Hi Daniel/Thomas,

Could you please help to review and provide any comments on this patch?
Thanks.

Best regards,
Xingyu Wu