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Subject: Re: [PATCH 05/13] m68k: coldfire: use legacy_timer_tick()
To:     Arnd Bergmann <arnd@arndb.de>, linux-kernel@vger.kernel.org
Cc:     Russell King <linux@armlinux.org.uk>,
        Tony Luck <tony.luck@intel.com>,
        Fenghua Yu <fenghua.yu@intel.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Finn Thain <fthain@telegraphics.com.au>,
        Philip Blundell <philb@gnu.org>,
        Joshua Thompson <funaho@jurai.org>,
        Sam Creasey <sammy@sammy.net>,
        "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
        Helge Deller <deller@gmx.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        John Stultz <john.stultz@linaro.org>,
        Stephen Boyd <sboyd@kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org,
        linux-m68k@lists.linux-m68k.org,
        linux-arm-kernel@lists.infradead.org
References: <20201008154651.1901126-1-arnd@arndb.de>
 <20201008154651.1901126-6-arnd@arndb.de>
From:   Greg Ungerer <gerg@linux-m68k.org>
Message-ID: <0bf8d0e5-5792-a2dd-884a-c82693b64b19@linux-m68k.org>
Date:   Fri, 9 Oct 2020 22:53:30 +1000
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Hi Arnd,

On 9/10/20 1:46 am, Arnd Bergmann wrote:
> Replace the indirect function calls in the timer code
> with direct calls to the newly added legacy_timer_tick()
> helper for those that have not yet been converted to
> generic clockevents.
> 
> This makes the timer code a little more self-contained.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

I tested this series on a couple of different ColdFire parts
(5208 and 5475) and under QEMU emulating the 5208. All checked
out good, all worked as expected. So for the ColdFire changes:

Tested-by: Greg Ungerer <gerg@linux-m68k.org>

Regards
Greg


> ---
>   arch/m68k/Kconfig.cpu         | 35 +++++++++++++++++++++++++++++------
>   arch/m68k/coldfire/Makefile   | 32 ++++++++++++++++++--------------
>   arch/m68k/coldfire/sltimers.c |  6 ++----
>   arch/m68k/coldfire/timers.c   |  6 ++----
>   4 files changed, 51 insertions(+), 28 deletions(-)
> 
> diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
> index 694c4fca9f5d..322a35ef14c6 100644
> --- a/arch/m68k/Kconfig.cpu
> +++ b/arch/m68k/Kconfig.cpu
> @@ -137,6 +137,7 @@ config M5206
>   	bool "MCF5206"
>   	depends on !MMU
>   	select COLDFIRE_SW_A7
> +	select COLDFIRE_TIMERS
>   	select HAVE_MBAR
>   	select CPU_NO_EFFICIENT_FFS
>   	help
> @@ -146,6 +147,7 @@ config M5206e
>   	bool "MCF5206e"
>   	depends on !MMU
>   	select COLDFIRE_SW_A7
> +	select COLDFIRE_TIMERS
>   	select HAVE_MBAR
>   	select CPU_NO_EFFICIENT_FFS
>   	help
> @@ -154,7 +156,7 @@ config M5206e
>   config M520x
>   	bool "MCF520x"
>   	depends on !MMU
> -	select GENERIC_CLOCKEVENTS
> +	select COLDFIRE_PIT_TIMER
>   	select HAVE_CACHE_SPLIT
>   	help
>   	   Freescale Coldfire 5207/5208 processor support.
> @@ -162,7 +164,7 @@ config M520x
>   config M523x
>   	bool "MCF523x"
>   	depends on !MMU
> -	select GENERIC_CLOCKEVENTS
> +	select COLDFIRE_PIT_TIMER
>   	select HAVE_CACHE_SPLIT
>   	select HAVE_IPSBAR
>   	help
> @@ -172,6 +174,7 @@ config M5249
>   	bool "MCF5249"
>   	depends on !MMU
>   	select COLDFIRE_SW_A7
> +	select COLDFIRE_TIMERS
>   	select HAVE_MBAR
>   	select CPU_NO_EFFICIENT_FFS
>   	help
> @@ -181,6 +184,7 @@ config M525x
>   	bool "MCF525x"
>   	depends on !MMU
>   	select COLDFIRE_SW_A7
> +	select COLDFIRE_TIMERS
>   	select HAVE_MBAR
>   	select CPU_NO_EFFICIENT_FFS
>   	help
> @@ -189,10 +193,10 @@ config M525x
>   config M5271
>   	bool "MCF5271"
>   	depends on !MMU
> +	select COLDFIRE_PIT_TIMER
>   	select M527x
>   	select HAVE_CACHE_SPLIT
>   	select HAVE_IPSBAR
> -	select GENERIC_CLOCKEVENTS
>   	help
>   	  Freescale (Motorola) ColdFire 5270/5271 processor support.
>   
> @@ -200,6 +204,7 @@ config M5272
>   	bool "MCF5272"
>   	depends on !MMU
>   	select COLDFIRE_SW_A7
> +	select COLDFIRE_TIMERS
>   	select HAVE_MBAR
>   	select CPU_NO_EFFICIENT_FFS
>   	help
> @@ -208,17 +213,17 @@ config M5272
>   config M5275
>   	bool "MCF5275"
>   	depends on !MMU
> +	select COLDFIRE_PIT_TIMER
>   	select M527x
>   	select HAVE_CACHE_SPLIT
>   	select HAVE_IPSBAR
> -	select GENERIC_CLOCKEVENTS
>   	help
>   	  Freescale (Motorola) ColdFire 5274/5275 processor support.
>   
>   config M528x
>   	bool "MCF528x"
>   	depends on !MMU
> -	select GENERIC_CLOCKEVENTS
> +	select COLDFIRE_PIT_TIMER
>   	select HAVE_CACHE_SPLIT
>   	select HAVE_IPSBAR
>   	help
> @@ -227,6 +232,7 @@ config M528x
>   config M5307
>   	bool "MCF5307"
>   	depends on !MMU
> +	select COLDFIRE_TIMERS
>   	select COLDFIRE_SW_A7
>   	select HAVE_CACHE_CB
>   	select HAVE_MBAR
> @@ -237,6 +243,7 @@ config M5307
>   config M532x
>   	bool "MCF532x"
>   	depends on !MMU
> +	select COLDFIRE_TIMERS
>   	select M53xx
>   	select HAVE_CACHE_CB
>   	help
> @@ -245,6 +252,7 @@ config M532x
>   config M537x
>   	bool "MCF537x"
>   	depends on !MMU
> +	select COLDFIRE_TIMERS
>   	select M53xx
>   	select HAVE_CACHE_CB
>   	help
> @@ -254,6 +262,7 @@ config M5407
>   	bool "MCF5407"
>   	depends on !MMU
>   	select COLDFIRE_SW_A7
> +	select COLDFIRE_TIMERS
>   	select HAVE_CACHE_CB
>   	select HAVE_MBAR
>   	select CPU_NO_EFFICIENT_FFS
> @@ -263,6 +272,7 @@ config M5407
>   config M547x
>   	bool "MCF547x"
>   	select M54xx
> +	select COLDFIRE_SLTIMERS
>   	select MMU_COLDFIRE if MMU
>   	select FPU if MMU
>   	select HAVE_CACHE_CB
> @@ -273,6 +283,7 @@ config M547x
>   
>   config M548x
>   	bool "MCF548x"
> +	select COLDFIRE_SLTIMERS
>   	select MMU_COLDFIRE if MMU
>   	select FPU if MMU
>   	select M54xx
> @@ -284,8 +295,8 @@ config M548x
>   
>   config M5441x
>   	bool "MCF5441x"
> +	select COLDFIRE_PIT_TIMER
>   	select MMU_COLDFIRE if MMU
> -	select GENERIC_CLOCKEVENTS
>   	select HAVE_CACHE_CB
>   	help
>   	  Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
> @@ -302,6 +313,18 @@ config M54xx
>   	select HAVE_PCI
>   	bool
>   
> +config COLDFIRE_PIT_TIMER
> +	bool
> +	select GENERIC_CLOCKEVENTS
> +
> +config COLDFIRE_TIMERS
> +	bool
> +	select LEGACY_TIMER_TICK
> +
> +config COLDFIRE_SLTIMERS
> +	bool
> +	select LEGACY_TIMER_TICK
> +
>   endif # COLDFIRE
>   
>   
> diff --git a/arch/m68k/coldfire/Makefile b/arch/m68k/coldfire/Makefile
> index 573eabca1a3a..a3e18d73d8b8 100644
> --- a/arch/m68k/coldfire/Makefile
> +++ b/arch/m68k/coldfire/Makefile
> @@ -16,20 +16,24 @@
>   asflags-$(CONFIG_FULLDEBUG) := -DDEBUGGER_COMPATIBLE_CACHE=1
>   
>   obj-$(CONFIG_COLDFIRE)	+= cache.o clk.o device.o dma.o entry.o vectors.o
> -obj-$(CONFIG_M5206)	+= m5206.o timers.o intc.o reset.o
> -obj-$(CONFIG_M5206e)	+= m5206.o timers.o intc.o reset.o
> -obj-$(CONFIG_M520x)	+= m520x.o pit.o intc-simr.o reset.o
> -obj-$(CONFIG_M523x)	+= m523x.o pit.o dma_timer.o intc-2.o reset.o
> -obj-$(CONFIG_M5249)	+= m5249.o timers.o intc.o intc-5249.o reset.o
> -obj-$(CONFIG_M525x)	+= m525x.o timers.o intc.o intc-525x.o reset.o
> -obj-$(CONFIG_M527x)	+= m527x.o pit.o intc-2.o reset.o
> -obj-$(CONFIG_M5272)	+= m5272.o intc-5272.o timers.o
> -obj-$(CONFIG_M528x)	+= m528x.o pit.o intc-2.o reset.o
> -obj-$(CONFIG_M5307)	+= m5307.o timers.o intc.o reset.o
> -obj-$(CONFIG_M53xx)	+= m53xx.o timers.o intc-simr.o reset.o
> -obj-$(CONFIG_M5407)	+= m5407.o timers.o intc.o reset.o
> -obj-$(CONFIG_M54xx)	+= m54xx.o sltimers.o intc-2.o
> -obj-$(CONFIG_M5441x)	+= m5441x.o pit.o intc-simr.o reset.o
> +obj-$(CONFIG_M5206)	+= m5206.o intc.o reset.o
> +obj-$(CONFIG_M5206e)	+= m5206.o intc.o reset.o
> +obj-$(CONFIG_M520x)	+= m520x.o intc-simr.o reset.o
> +obj-$(CONFIG_M523x)	+= m523x.o dma_timer.o intc-2.o reset.o
> +obj-$(CONFIG_M5249)	+= m5249.o intc.o intc-5249.o reset.o
> +obj-$(CONFIG_M525x)	+= m525x.o intc.o intc-525x.o reset.o
> +obj-$(CONFIG_M527x)	+= m527x.o intc-2.o reset.o
> +obj-$(CONFIG_M5272)	+= m5272.o intc-5272.o
> +obj-$(CONFIG_M528x)	+= m528x.o intc-2.o reset.o
> +obj-$(CONFIG_M5307)	+= m5307.o intc.o reset.o
> +obj-$(CONFIG_M53xx)	+= m53xx.o intc-simr.o reset.o
> +obj-$(CONFIG_M5407)	+= m5407.o intc.o reset.o
> +obj-$(CONFIG_M54xx)	+= m54xx.o intc-2.o
> +obj-$(CONFIG_M5441x)	+= m5441x.o intc-simr.o reset.o
> +
> +obj-$(CONFIG_COLDFIRE_PIT_TIMER) += pit.o
> +obj-$(CONFIG_COLDFIRE_TIMERS)	 += timers.o
> +obj-$(CONFIG_COLDFIRE_SLTIMERS)	 += sltimers.o
>   
>   obj-$(CONFIG_NETtel)	+= nettel.o
>   obj-$(CONFIG_CLEOPATRA)	+= nettel.o
> diff --git a/arch/m68k/coldfire/sltimers.c b/arch/m68k/coldfire/sltimers.c
> index 5ab81c9c552d..25a1319f3cb8 100644
> --- a/arch/m68k/coldfire/sltimers.c
> +++ b/arch/m68k/coldfire/sltimers.c
> @@ -83,14 +83,13 @@ void mcfslt_profile_init(void)
>   static u32 mcfslt_cycles_per_jiffy;
>   static u32 mcfslt_cnt;
>   
> -static irq_handler_t timer_interrupt;
> -
>   static irqreturn_t mcfslt_tick(int irq, void *dummy)
>   {
>   	/* Reset Slice Timer 0 */
>   	__raw_writel(MCFSLT_SSR_BE | MCFSLT_SSR_TE, TA(MCFSLT_SSR));
>   	mcfslt_cnt += mcfslt_cycles_per_jiffy;
> -	return timer_interrupt(irq, dummy);
> +	legacy_timer_tick(1);
> +	return IRQ_HANDLED;
>   }
>   
>   static u64 mcfslt_read_clk(struct clocksource *cs)
> @@ -136,7 +135,6 @@ void hw_timer_init(irq_handler_t handler)
>   	/* initialize mcfslt_cnt knowing that slice timers count down */
>   	mcfslt_cnt = mcfslt_cycles_per_jiffy;
>   
> -	timer_interrupt = handler;
>   	r = request_irq(MCF_IRQ_TIMER, mcfslt_tick, IRQF_TIMER, "timer", NULL);
>   	if (r) {
>   		pr_err("Failed to request irq %d (timer): %pe\n", MCF_IRQ_TIMER,
> diff --git a/arch/m68k/coldfire/timers.c b/arch/m68k/coldfire/timers.c
> index b8301fddf901..24b5e2d1b00b 100644
> --- a/arch/m68k/coldfire/timers.c
> +++ b/arch/m68k/coldfire/timers.c
> @@ -48,8 +48,6 @@ void coldfire_profile_init(void);
>   static u32 mcftmr_cycles_per_jiffy;
>   static u32 mcftmr_cnt;
>   
> -static irq_handler_t timer_interrupt;
> -
>   /***************************************************************************/
>   
>   static void init_timer_irq(void)
> @@ -77,7 +75,8 @@ static irqreturn_t mcftmr_tick(int irq, void *dummy)
>   	__raw_writeb(MCFTIMER_TER_CAP | MCFTIMER_TER_REF, TA(MCFTIMER_TER));
>   
>   	mcftmr_cnt += mcftmr_cycles_per_jiffy;
> -	return timer_interrupt(irq, dummy);
> +	legacy_timer_tick(1);
> +	return IRQ_HANDLED;
>   }
>   
>   /***************************************************************************/
> @@ -126,7 +125,6 @@ void hw_timer_init(irq_handler_t handler)
>   
>   	clocksource_register_hz(&mcftmr_clk, FREQ);
>   
> -	timer_interrupt = handler;
>   	init_timer_irq();
>   	r = request_irq(MCF_IRQ_TIMER, mcftmr_tick, IRQF_TIMER, "timer", NULL);
>   	if (r) {
>