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Subject: Re: [PATCH v2 06/15] clocksource/drivers/timer-milbeaut: Introduce
 timer for Milbeaut SoCs
To:     Daniel Lezcano <daniel.lezcano@linaro.org>,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Takao Orito <orito.takao@socionext.com>,
        Kazuhiro Kasai <kasai.kazuhiro@socionext.com>,
        Shinji Kanematsu <kanematsu.shinji@socionext.com>,
        Jassi Brar <jaswinder.singh@linaro.org>,
        Masami Hiramatsu <masami.hiramatsu@linaro.org>
References: <1549628812-31235-1-git-send-email-sugaya.taichi@socionext.com>
 <96b6fbb3-9cd9-7468-6733-98667664f0b8@linaro.org>
From:   "Sugaya, Taichi" <sugaya.taichi@socionext.com>
Message-ID: <c67990f4-fa87-5741-684a-9b836fa460b0@socionext.com>
Date:   Fri, 15 Feb 2019 11:26:24 +0900
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Hi, Daniel

On 2019/02/15 0:22, Daniel Lezcano wrote:
> On 08/02/2019 13:26, Sugaya Taichi wrote:
>> Add timer driver for Milbeaut SoCs series.
>>
>> The timer has two 32-bit width down counters, one of which is configured
>> as a clockevent device and the other is configured as a clock source.
>>
>> Signed-off-by: Sugaya Taichi <sugaya.taichi@socionext.com>
> 
> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> 

Thank you!

>> ---
>>   drivers/clocksource/Kconfig          |   9 ++
>>   drivers/clocksource/Makefile         |   1 +
>>   drivers/clocksource/timer-milbeaut.c | 161 +++++++++++++++++++++++++++++++++++
>>   3 files changed, 171 insertions(+)
>>   create mode 100644 drivers/clocksource/timer-milbeaut.c
>>
>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
>> index a9e26f6..9101b8f 100644
>> --- a/drivers/clocksource/Kconfig
>> +++ b/drivers/clocksource/Kconfig
>> @@ -634,4 +634,13 @@ config GX6605S_TIMER
>>   	help
>>   	  This option enables support for gx6605s SOC's timer.
>>   
>> +config MILBEAUT_TIMER
>> +	bool "Milbeaut timer driver" if COMPILE_TEST
>> +	depends on OF
>> +	depends on ARM
>> +	select TIMER_OF
>> +	select CLKSRC_MMIO
>> +	help
>> +	  Enables the support for Milbeaut timer driver.
>> +
>>   endmenu
>> diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
>> index cdd210f..6f2543b 100644
>> --- a/drivers/clocksource/Makefile
>> +++ b/drivers/clocksource/Makefile
>> @@ -55,6 +55,7 @@ obj-$(CONFIG_CLKSRC_TI_32K)	+= timer-ti-32k.o
>>   obj-$(CONFIG_CLKSRC_NPS)	+= timer-nps.o
>>   obj-$(CONFIG_OXNAS_RPS_TIMER)	+= timer-oxnas-rps.o
>>   obj-$(CONFIG_OWL_TIMER)		+= timer-owl.o
>> +obj-$(CONFIG_MILBEAUT_TIMER)	+= timer-milbeaut.o
>>   obj-$(CONFIG_SPRD_TIMER)	+= timer-sprd.o
>>   obj-$(CONFIG_NPCM7XX_TIMER)	+= timer-npcm7xx.o
>>   obj-$(CONFIG_RDA_TIMER)		+= timer-rda.o
>> diff --git a/drivers/clocksource/timer-milbeaut.c b/drivers/clocksource/timer-milbeaut.c
>> new file mode 100644
>> index 0000000..f2019a8
>> --- /dev/null
>> +++ b/drivers/clocksource/timer-milbeaut.c
>> @@ -0,0 +1,161 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2018 Socionext Inc.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/irq.h>
>> +#include <linux/irqreturn.h>
>> +#include <linux/sched_clock.h>
>> +#include "timer-of.h"
>> +
>> +#define MLB_TMR_TMCSR_OFS	0x0
>> +#define MLB_TMR_TMR_OFS		0x4
>> +#define MLB_TMR_TMRLR1_OFS	0x8
>> +#define MLB_TMR_TMRLR2_OFS	0xc
>> +#define MLB_TMR_REGSZPCH	0x10
>> +
>> +#define MLB_TMR_TMCSR_OUTL	BIT(5)
>> +#define MLB_TMR_TMCSR_RELD	BIT(4)
>> +#define MLB_TMR_TMCSR_INTE	BIT(3)
>> +#define MLB_TMR_TMCSR_UF	BIT(2)
>> +#define MLB_TMR_TMCSR_CNTE	BIT(1)
>> +#define MLB_TMR_TMCSR_TRG	BIT(0)
>> +
>> +#define MLB_TMR_TMCSR_CSL_DIV2	0
>> +#define MLB_TMR_DIV_CNT		2
>> +
>> +#define MLB_TMR_SRC_CH  (1)
>> +#define MLB_TMR_EVT_CH  (0)
>> +
>> +#define MLB_TMR_SRC_CH_OFS	(MLB_TMR_REGSZPCH * MLB_TMR_SRC_CH)
>> +#define MLB_TMR_EVT_CH_OFS	(MLB_TMR_REGSZPCH * MLB_TMR_EVT_CH)
>> +
>> +#define MLB_TMR_SRC_TMCSR_OFS	(MLB_TMR_SRC_CH_OFS + MLB_TMR_TMCSR_OFS)
>> +#define MLB_TMR_SRC_TMR_OFS	(MLB_TMR_SRC_CH_OFS + MLB_TMR_TMR_OFS)
>> +#define MLB_TMR_SRC_TMRLR1_OFS	(MLB_TMR_SRC_CH_OFS + MLB_TMR_TMRLR1_OFS)
>> +#define MLB_TMR_SRC_TMRLR2_OFS	(MLB_TMR_SRC_CH_OFS + MLB_TMR_TMRLR2_OFS)
>> +
>> +#define MLB_TMR_EVT_TMCSR_OFS	(MLB_TMR_EVT_CH_OFS + MLB_TMR_TMCSR_OFS)
>> +#define MLB_TMR_EVT_TMR_OFS	(MLB_TMR_EVT_CH_OFS + MLB_TMR_TMR_OFS)
>> +#define MLB_TMR_EVT_TMRLR1_OFS	(MLB_TMR_EVT_CH_OFS + MLB_TMR_TMRLR1_OFS)
>> +#define MLB_TMR_EVT_TMRLR2_OFS	(MLB_TMR_EVT_CH_OFS + MLB_TMR_TMRLR2_OFS)
>> +
>> +#define MLB_TIMER_RATING	500
>> +
>> +static irqreturn_t mlb_timer_interrupt(int irq, void *dev_id)
>> +{
>> +	struct clock_event_device *clk = dev_id;
>> +	struct timer_of *to = to_timer_of(clk);
>> +	u32 val;
>> +
>> +	val = readl_relaxed(timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
>> +	val &= ~MLB_TMR_TMCSR_UF;
>> +	writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
>> +
>> +	clk->event_handler(clk);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int mlb_set_state_periodic(struct clock_event_device *clk)
>> +{
>> +	struct timer_of *to = to_timer_of(clk);
>> +	u32 val = MLB_TMR_TMCSR_CSL_DIV2;
>> +
>> +	writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
>> +
>> +	writel_relaxed(to->of_clk.period, timer_of_base(to) +
>> +				MLB_TMR_EVT_TMRLR1_OFS);
>> +	val |= MLB_TMR_TMCSR_RELD | MLB_TMR_TMCSR_CNTE |
>> +		MLB_TMR_TMCSR_TRG | MLB_TMR_TMCSR_INTE;
>> +	writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
>> +	return 0;
>> +}
>> +
>> +static int mlb_set_state_oneshot(struct clock_event_device *clk)
>> +{
>> +	struct timer_of *to = to_timer_of(clk);
>> +	u32 val = MLB_TMR_TMCSR_CSL_DIV2;
>> +
>> +	writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
>> +	return 0;
>> +}
>> +
>> +static int mlb_clkevt_next_event(unsigned long event,
>> +				   struct clock_event_device *clk)
>> +{
>> +	struct timer_of *to = to_timer_of(clk);
>> +
>> +	writel_relaxed(event, timer_of_base(to) + MLB_TMR_EVT_TMRLR1_OFS);
>> +	writel_relaxed(MLB_TMR_TMCSR_CSL_DIV2 |
>> +			MLB_TMR_TMCSR_CNTE | MLB_TMR_TMCSR_INTE |
>> +			MLB_TMR_TMCSR_TRG, timer_of_base(to) +
>> +			MLB_TMR_EVT_TMCSR_OFS);
>> +	return 0;
>> +}
>> +
>> +static int mlb_config_clock_source(struct timer_of *to)
>> +{
>> +	writel_relaxed(0, timer_of_base(to) + MLB_TMR_SRC_TMCSR_OFS);
>> +	writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMR_OFS);
>> +	writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMRLR1_OFS);
>> +	writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMRLR2_OFS);
>> +	writel_relaxed(BIT(4) | BIT(1) | BIT(0), timer_of_base(to) +
>> +		MLB_TMR_SRC_TMCSR_OFS);
>> +	return 0;
>> +}
>> +
>> +static int mlb_config_clock_event(struct timer_of *to)
>> +{
>> +	writel_relaxed(0, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
>> +	return 0;
>> +}
>> +
>> +static struct timer_of to = {
>> +	.flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
>> +
>> +	.clkevt = {
>> +		.name = "mlb-clkevt",
>> +		.rating = MLB_TIMER_RATING,
>> +		.cpumask = cpu_possible_mask,
>> +		.features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_ONESHOT,
>> +		.set_state_oneshot = mlb_set_state_oneshot,
>> +		.set_state_periodic = mlb_set_state_periodic,
>> +		.set_next_event = mlb_clkevt_next_event,
>> +	},
>> +
>> +	.of_irq = {
>> +		.flags = IRQF_TIMER | IRQF_IRQPOLL,
>> +		.handler = mlb_timer_interrupt,
>> +	},
>> +};
>> +
>> +static u64 notrace mlb_timer_sched_read(void)
>> +{
>> +	return ~readl_relaxed(timer_of_base(&to) + MLB_TMR_SRC_TMR_OFS);
>> +}
>> +
>> +static int __init mlb_timer_init(struct device_node *node)
>> +{
>> +	int ret;
>> +	unsigned long rate;
>> +
>> +	ret = timer_of_init(node, &to);
>> +	if (ret)
>> +		return ret;
>> +
>> +	rate = timer_of_rate(&to) / MLB_TMR_DIV_CNT;
>> +	mlb_config_clock_source(&to);
>> +	clocksource_mmio_init(timer_of_base(&to) + MLB_TMR_SRC_TMR_OFS,
>> +		node->name, rate, MLB_TIMER_RATING, 32,
>> +		clocksource_mmio_readl_down);
>> +	sched_clock_register(mlb_timer_sched_read, 32, rate);
>> +	mlb_config_clock_event(&to);
>> +	clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), 15,
>> +		0xffffffff);
>> +	return 0;
>> +}
>> +TIMER_OF_DECLARE(mlb_peritimer, "socionext,milbeaut-timer",
>> +		mlb_timer_init);
>>
> 
>