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Message-ID: <c67990f4-fa87-5741-684a-9b836fa460b0@socionext.com>
Date: Fri, 15 Feb 2019 11:26:24 +0900
From: "Sugaya, Taichi" <sugaya.taichi@...ionext.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
Takao Orito <orito.takao@...ionext.com>,
Kazuhiro Kasai <kasai.kazuhiro@...ionext.com>,
Shinji Kanematsu <kanematsu.shinji@...ionext.com>,
Jassi Brar <jaswinder.singh@...aro.org>,
Masami Hiramatsu <masami.hiramatsu@...aro.org>
Subject: Re: [PATCH v2 06/15] clocksource/drivers/timer-milbeaut: Introduce
timer for Milbeaut SoCs
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@...ionext.com>
>
> Acked-by: Daniel Lezcano <daniel.lezcano@...aro.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);
>>
>
>
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