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Date: Thu, 22 Nov 2018 11:23:54 +0900
From: "Sugaya, Taichi" <sugaya.taichi@...ionext.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>,
linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-serial@...r.kernel.org
Cc: Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Russell King <linux@...linux.org.uk>,
Jiri Slaby <jslaby@...e.com>,
Masami Hiramatsu <masami.hiramatsu@...aro.org>,
Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH 05/14] clocksource/drivers/timer-milbeaut: Add Milbeaut
M10V timer
Hi Daniel
Thank you for your comments.
On 2018/11/21 19:08, Daniel Lezcano wrote:
> Hi Sugaya,
>
>
> On 19/11/2018 02:01, Sugaya Taichi wrote:
>> Add Milbeaut M10V timer using 32bit timer in peripheral.
> Give a better description of the timer as it is new timer introduced.
I got it. Add more description.
>> Signed-off-by: Sugaya Taichi <sugaya.taichi@...ionext.com>
>> ---
>> drivers/clocksource/Kconfig | 8 +++
>> drivers/clocksource/Makefile | 1 +
>> drivers/clocksource/timer-m10v.c | 146 +++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 155 insertions(+)
>> create mode 100644 drivers/clocksource/timer-m10v.c
>>
>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
>> index 55c77e4..a278d72 100644
>> --- a/drivers/clocksource/Kconfig
>> +++ b/drivers/clocksource/Kconfig
>> @@ -638,4 +638,12 @@ config GX6605S_TIMER
>> help
>> This option enables support for gx6605s SOC's timer.
>>
>> +config M10V_TIMER
>> + bool "Milbeaut M10V timer driver" if COMPILE_TEST
>> + depends on OF
>> + depends on ARM
>> + select TIMER_OF
>> + help
>> + Enables the support for Milbeaut M10V timer driver.
>> +
>> endmenu
>> diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
>> index dd91381..8e908b4 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-$(CONFIG_M10V_TIMER) += timer-m10v.o
>> obj-$(CONFIG_SPRD_TIMER) += timer-sprd.o
>> obj-$(CONFIG_NPCM7XX_TIMER) += timer-npcm7xx.o
>>
>> diff --git a/drivers/clocksource/timer-m10v.c b/drivers/clocksource/timer-m10v.c
>> new file mode 100644
>> index 0000000..ff97c23
>> --- /dev/null
>> +++ b/drivers/clocksource/timer-m10v.c
>> @@ -0,0 +1,146 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2018 Socionext Inc.
>> + */
>> +
>> +#include <linux/clk.h>
> ------->
>
>> +#include <linux/clockchips.h>
> It is included from timer-of.h
>
> <-------
OK. Remove it.
>
>> +#include <linux/interrupt.h>
>> +#include <linux/irq.h>
>> +#include <linux/irqreturn.h>
> ------->
>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/slab.h>
> Those are not needed IMO.
>
> <---------
OK, remove these.
>
>
>> +#include "timer-of.h"
>> +
>> +#define FSL_TMR_TMCSR_OFS 0x0
>> +#define FSL_TMR_TMR_OFS 0x4
>> +#define FSL_TMR_TMRLR1_OFS 0x8
>> +#define FSL_TMR_TMRLR2_OFS 0xc
>> +#define FSL_RMT_REGSZPCH 0x10
>> +
>> +#define FSL_TMR_TMCSR_OUTL BIT(5)
>> +#define FSL_TMR_TMCSR_RELD BIT(4)
>> +#define FSL_TMR_TMCSR_INTE BIT(3)
>> +#define FSL_TMR_TMCSR_UF BIT(2)
>> +#define FSL_TMR_TMCSR_CNTE BIT(1)
>> +#define FSL_TMR_TMCSR_TRG BIT(0)
>> +
>> +#define FSL_TMR_TMCSR_CSL_DIV2 0
>> +#define FSL_TMR_TMCSR_CSL BIT(10)
>> +
>> +#define M10V_TIMER_RATING 500
>> +
>> +static irqreturn_t m10v_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) + FSL_TMR_TMCSR_OFS);
>> + val &= ~FSL_TMR_TMCSR_UF;
>> + writel_relaxed(val, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
>> +
>> + clk->event_handler(clk);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static int m10v_set_state_periodic(struct clock_event_device *clk)
>> +{
>> + struct timer_of *to = to_timer_of(clk);
>> + u32 val = (FSL_TMR_TMCSR_CSL_DIV2 * FSL_TMR_TMCSR_CSL);
> FSL_TMR_TMCSR_CSL_DIV2 is zero, so val is always zero.
Ah, yes.
The FSL_TMR_TMCSR is the 10th bit field of the register, so it would be
better
to bit-shift.
I will use it as simply 0.
>
>> + writel_relaxed(val, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
>> +
>> + writel_relaxed(to->of_clk.period, timer_of_base(to) +
>> + FSL_TMR_TMRLR1_OFS);
>> + val |= FSL_TMR_TMCSR_RELD | FSL_TMR_TMCSR_CNTE |
>> + FSL_TMR_TMCSR_TRG | FSL_TMR_TMCSR_INTE;
>> + writel_relaxed(val, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
>> + return 0;
>> +}
>> +
>> +static int m10v_set_state_oneshot(struct clock_event_device *clk)
>> +{
>> + struct timer_of *to = to_timer_of(clk);
>> + u32 val = (FSL_TMR_TMCSR_CSL_DIV2 * FSL_TMR_TMCSR_CSL);
>> +
>> + writel_relaxed(val, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
>> + return 0;
>> +}
>> +
>> +static int m10v_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) + FSL_TMR_TMRLR1_OFS);
>> + writel_relaxed((FSL_TMR_TMCSR_CSL_DIV2 * FSL_TMR_TMCSR_CSL) |
> Same comment here.
I got it.
>> + FSL_TMR_TMCSR_CNTE | FSL_TMR_TMCSR_INTE |
>> + FSL_TMR_TMCSR_TRG, timer_of_base(to) +
>> + FSL_TMR_TMCSR_OFS);
>> + return 0;
>> +}
>> +
>> +static int m10v_config_clock_source(struct timer_of *to)
>> +{
>> + writel_relaxed(0, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
>> + writel_relaxed(~0, timer_of_base(to) + FSL_TMR_TMR_OFS);
>> + writel_relaxed(~0, timer_of_base(to) + FSL_TMR_TMRLR1_OFS);
>> + writel_relaxed(~0, timer_of_base(to) + FSL_TMR_TMRLR2_OFS);
>> + writel_relaxed(BIT(4) | BIT(1) | BIT(0), timer_of_base(to) +
>> + FSL_TMR_TMCSR_OFS);
>> + return 0;
>> +}
>> +
>> +static int m10v_config_clock_event(struct timer_of *to)
>> +{
>> + writel_relaxed(0, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
>> + return 0;
>> +}
>> +
>> +static struct timer_of to = {
>> + .flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
>> +
>> + .clkevt = {
>> + .name = "m10v-clkevt",
>> + .rating = M10V_TIMER_RATING,
>> + .cpumask = cpu_possible_mask,
>> + },
>> +
>> + .of_irq = {
>> + .flags = IRQF_TIMER | IRQF_IRQPOLL,
>> + },
>> +};
>> +
>> +static int __init m10v_timer_init(struct device_node *node)
>> +{
>> + int ret;
>> +
>> + to.clkevt.features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_ONESHOT;
>> + to.clkevt.set_state_oneshot = m10v_set_state_oneshot;
>> + to.clkevt.set_state_periodic = m10v_set_state_periodic;
>> + to.clkevt.set_next_event = m10v_clkevt_next_event;
>> + to.of_irq.handler = m10v_timer_interrupt;
> Move the initialization in the timer_of structure above.
Okay.
>
>> + ret = timer_of_init(node, &to);
>> + if (ret)
>> + goto err;
> You should return directly, rollback is done in the timer_of_init().
OK.
>
>> +
>> + m10v_config_clock_source(&to);
>> + clocksource_mmio_init(timer_of_base(&to) + FSL_TMR_TMR_OFS,
>> + node->name, timer_of_rate(&to), M10V_TIMER_RATING, 32,
>> + clocksource_mmio_readl_down);
> May be you can add the sched_clock also ?
OK. Add it and confirm.
Thanks
Sugaya Taichi
>
>> + m10v_config_clock_event(&to);
>> + clockevents_config_and_register(&to.clkevt, timer_of_rate(&to),
>> + 15, 0xffffffff);
>> +
>> + return 0;
>> +err:
>> + timer_of_cleanup(&to);
>> + return ret;
>> +}
>> +TIMER_OF_DECLARE(m10v_peritimer, "socionext,milbeaut-m10v-timer",
>> + m10v_timer_init);
>>
>
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