[PATCH v2 02/13] ARM: convert arm/arm64 arch timer to use CLKSRC_OF init

Simon Horman
2013-04-04T05:56:15Z

On Mon, Apr 01, 2013 at 05:21:12PM -0500, Rob Herring wrote:
> From: Rob Herring <rob.herring@calxeda.com>
>
> This converts arm and arm64 to use CLKSRC_OF DT based initialization for
> the arch timer. A new function arch_timer_arch_init is added to allow for
> arch specific setup.
>
> This has a side effect of enabling sched_clock on omap5 and exynos5. There
> should not be any reason not to use the arch timers for sched_clock.

Would it be possible for you to either delay the removal of
shmobile_timer_init. In general I am in favour of the following
approach to wide changes such as this one:

1. Add new feature
2. Convert users to new feature
3. Remove old feature.

If it is not possible to delay the removal of shmobile_timer_init could you
update your base such that you also remove its usage from the following
files:

arch/arm/mach-shmobile/board-kzm9g-reference.c
arch/arm/mach-shmobile/setup-r8a73a4.c
arch/arm/mach-shmobile/setup-r8a7779.c
arch/arm/mach-shmobile/board-lager.c
arch/arm/mach-shmobile/board-ape6evm.c
arch/arm/mach-shmobile/setup-r8a7778.c
arch/arm/mach-shmobile/board-marzen-reference.c
arch/arm/mach-shmobile/setup-r8a7790.c
arch/arm/mach-shmobile/board-bockw.c

The above files are all present in the arm-soc/next/boards2 branch
of the arm-soc tree which has pulled the renesas-boards3-for-v3.10 tag
of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git.
I am happy for you use the later as a base if you wish.

> Signed-off-by: Rob Herring <rob.herring@calxeda.com>
> Cc: Russell King <linux@arm.linux.org.uk>
> Cc: Kukjin Kim <kgene.kim@samsung.com>
> Cc: Tony Lindgren <tony@atomide.com>
> Cc: Simon Horman <horms@verge.net.au>
> Cc: Magnus Damm <magnus.damm@gmail.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: John Stultz <john.stultz@linaro.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: linux-samsung-soc at vger.kernel.org
> Cc: linux-omap at vger.kernel.org
> Cc: linux-sh at vger.kernel.org
> ---
> arch/arm/include/asm/arch_timer.h | 13 +------------
> arch/arm/kernel/arch_timer.c | 17 +++--------------
> arch/arm/mach-exynos/mach-exynos5-dt.c | 1 -
> arch/arm/mach-exynos/mct.c | 6 ------
> arch/arm/mach-highbank/highbank.c | 5 +----
> arch/arm/mach-omap2/timer.c | 5 +----
> arch/arm/mach-shmobile/board-kzm9d.c | 1 -

I have boot tested the board-kzm9d change on the kzm9d board, it seems fine.

> arch/arm/mach-shmobile/include/mach/common.h | 1 -
> arch/arm/mach-shmobile/setup-emev2.c | 1 -

I am not able to test the setup-emev2 portion properly at this time,
booting the kzm9d board without the board-kzm9d file seems broken without
your patch. However, your change seems reasonable to me.

> arch/arm/mach-shmobile/setup-r8a7740.c | 1 -

I am not able to test the setup-r8a7740 portion properly at this time,
booting the armadillo800eva board without the board-armadillo800eva file
seems broken without your patch. However, your change seems reasonable to
me.

> arch/arm/mach-shmobile/setup-sh7372.c | 1 -

I am not able to test the setup-sh7372 portion properly at this time,
booting the mackerel board without the board-mackerel file seems broken without
your patch. However, your change seems reasonable to me.

> arch/arm/mach-shmobile/setup-sh73a0.c | 1 -

I have boot tested the setup-sh73a0 change on the kzm9g board, it seems fine.

The tests above were made by merging

git://sources.calxeda.com/kernel/linux.git arm-timers
head commit: df3f518db302caf9fc0511917c5e9021037f6fcd
("devtree: add binding documentation for sp804")

and the renesas-next-20130403 tag of the renesas tree (URL above).

> arch/arm/mach-shmobile/timer.c | 6 ------
> arch/arm/mach-vexpress/v2m.c | 7 ++-----
> arch/arm/mach-virt/virt.c | 9 ---------
> arch/arm64/include/asm/arch_timer.h | 5 +++++
> arch/arm64/kernel/time.c | 6 ++++--
> drivers/clocksource/Kconfig | 1 +
> drivers/clocksource/arm_arch_timer.c | 23 +++++++++--------------
> include/clocksource/arm_arch_timer.h | 6 ------
> 20 files changed, 27 insertions(+), 89 deletions(-)
>
> diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h
> index 7ade91d..7c1bfc0 100644
> --- a/arch/arm/include/asm/arch_timer.h
> +++ b/arch/arm/include/asm/arch_timer.h
> @@ -10,8 +10,7 @@
> #include <clocksource/arm_arch_timer.h>
>
> #ifdef CONFIG_ARM_ARCH_TIMER
> -int arch_timer_of_register(void);
> -int arch_timer_sched_clock_init(void);
> +int arch_timer_arch_init(void);
>
> /*
> * These register accessors are marked inline so the compiler can
> @@ -110,16 +109,6 @@ static inline void __cpuinit arch_counter_set_user_access(void)
>
> asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
> }
> -#else
> -static inline int arch_timer_of_register(void)
> -{
> - return -ENXIO;
> -}
> -
> -static inline int arch_timer_sched_clock_init(void)
> -{
> - return -ENXIO;
> -}
> #endif
>
> #endif
> diff --git a/arch/arm/kernel/arch_timer.c b/arch/arm/kernel/arch_timer.c
> index a7536d4..dc74048 100644
> --- a/arch/arm/kernel/arch_timer.c
> +++ b/arch/arm/kernel/arch_timer.c
> @@ -39,26 +39,15 @@ static void __init arch_timer_delay_timer_register(void)
> register_current_timer_delay(&arch_delay_timer);
> }
>
> -int __init arch_timer_of_register(void)
> -{
> - int ret;
> -
> - ret = arch_timer_init();
> - if (ret)
> - return ret;
> -
> - arch_timer_delay_timer_register();
> -
> - return 0;
> -}
> -
> -int __init arch_timer_sched_clock_init(void)
> +int __init arch_timer_arch_init(void)
> {
> u32 arch_timer_rate = arch_timer_get_rate();
>
> if (arch_timer_rate == 0)
> return -ENXIO;
>
> + arch_timer_delay_timer_register();
> +
> /* Cache the sched_clock multiplier to save a divide in the hot path. */
> sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
> sched_clock_func = arch_timer_sched_clock;
> diff --git a/arch/arm/mach-exynos/mach-exynos5-dt.c b/arch/arm/mach-exynos/mach-exynos5-dt.c
> index acaeb14..4d97b43 100644
> --- a/arch/arm/mach-exynos/mach-exynos5-dt.c
> +++ b/arch/arm/mach-exynos/mach-exynos5-dt.c
> @@ -216,7 +216,6 @@ DT_MACHINE_START(EXYNOS5_DT, "SAMSUNG EXYNOS5 (Flattened Device Tree)")
> .map_io = exynos5_dt_map_io,
> .init_machine = exynos5_dt_machine_init,
> .init_late = exynos_init_late,
> - .init_time = exynos4_timer_init,
> .dt_compat = exynos5_dt_compat,
> .restart = exynos5_restart,
> .reserve = exynos5_reserve,
> diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c
> index c9d6650..04aff6a 100644
> --- a/arch/arm/mach-exynos/mct.c
> +++ b/arch/arm/mach-exynos/mct.c
> @@ -21,7 +21,6 @@
> #include <linux/percpu.h>
> #include <linux/of.h>
>
> -#include <asm/arch_timer.h>
> #include <asm/localtimer.h>
>
> #include <plat/cpu.h>
> @@ -469,11 +468,6 @@ static void __init exynos4_timer_resources(void)
>
> void __init exynos4_timer_init(void)
> {
> - if (soc_is_exynos5440()) {
> - arch_timer_of_register();
> - return;
> - }
> -
> if ((soc_is_exynos4210()) || (soc_is_exynos5250()))
> mct_int_type = MCT_INT_SPI;
> else
> diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c
> index 76c1170..758150e 100644
> --- a/arch/arm/mach-highbank/highbank.c
> +++ b/arch/arm/mach-highbank/highbank.c
> @@ -15,6 +15,7 @@
> */
> #include <linux/clk.h>
> #include <linux/clkdev.h>
> +#include <linux/clocksource.h>
> #include <linux/dma-mapping.h>
> #include <linux/io.h>
> #include <linux/irq.h>
> @@ -28,7 +29,6 @@
> #include <linux/amba/bus.h>
> #include <linux/clk-provider.h>
>
> -#include <asm/arch_timer.h>
> #include <asm/cacheflush.h>
> #include <asm/cputype.h>
> #include <asm/smp_plat.h>
> @@ -118,9 +118,6 @@ static void __init highbank_timer_init(void)
> sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1");
> sp804_clockevents_init(timer_base, irq, "timer0");
>
> - arch_timer_of_register();
> - arch_timer_sched_clock_init();
> -
> clocksource_of_init();
> }
>
> diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
> index 4fd8025..7dd6453 100644
> --- a/arch/arm/mach-omap2/timer.c
> +++ b/arch/arm/mach-omap2/timer.c
> @@ -46,7 +46,6 @@
> #include <asm/smp_twd.h>
> #include <asm/sched_clock.h>
>
> -#include <asm/arch_timer.h>
> #include "omap_hwmod.h"
> #include "omap_device.h"
> #include <plat/counter-32k.h>
> @@ -624,9 +623,7 @@ void __init omap5_realtime_timer_init(void)
> omap5_sync32k_timer_init();
> realtime_counter_init();
>
> - err = arch_timer_of_register();
> - if (err)
> - pr_err("%s: arch_timer_register failed %d\n", __func__, err);
> + clocksource_of_init();
> }
> #endif /* CONFIG_SOC_OMAP5 */
>
> diff --git a/arch/arm/mach-shmobile/board-kzm9d.c b/arch/arm/mach-shmobile/board-kzm9d.c
> index c254782..c016ccd 100644
> --- a/arch/arm/mach-shmobile/board-kzm9d.c
> +++ b/arch/arm/mach-shmobile/board-kzm9d.c
> @@ -90,6 +90,5 @@ DT_MACHINE_START(KZM9D_DT, "kzm9d")
> .init_irq = emev2_init_irq,
> .init_machine = kzm9d_add_standard_devices,
> .init_late = shmobile_init_late,
> - .init_time = shmobile_timer_init,
> .dt_compat = kzm9d_boards_compat_dt,
> MACHINE_END
> diff --git a/arch/arm/mach-shmobile/include/mach/common.h b/arch/arm/mach-shmobile/include/mach/common.h
> index e48606d..5efc0f0 100644
> --- a/arch/arm/mach-shmobile/include/mach/common.h
> +++ b/arch/arm/mach-shmobile/include/mach/common.h
> @@ -2,7 +2,6 @@
> #define __ARCH_MACH_COMMON_H
>
> extern void shmobile_earlytimer_init(void);
> -extern void shmobile_timer_init(void);
> extern void shmobile_setup_delay(unsigned int max_cpu_core_mhz,
> unsigned int mult, unsigned int div);
> struct twd_local_timer;
> diff --git a/arch/arm/mach-shmobile/setup-emev2.c b/arch/arm/mach-shmobile/setup-emev2.c
> index 47662a5..4e38a66 100644
> --- a/arch/arm/mach-shmobile/setup-emev2.c
> +++ b/arch/arm/mach-shmobile/setup-emev2.c
> @@ -456,7 +456,6 @@ DT_MACHINE_START(EMEV2_DT, "Generic Emma Mobile EV2 (Flattened Device Tree)")
> .nr_irqs = NR_IRQS_LEGACY,
> .init_irq = irqchip_init,
> .init_machine = emev2_add_standard_devices_dt,
> - .init_time = shmobile_timer_init,
> .dt_compat = emev2_boards_compat_dt,
> MACHINE_END
>
> diff --git a/arch/arm/mach-shmobile/setup-r8a7740.c b/arch/arm/mach-shmobile/setup-r8a7740.c
> index 8b85d4d..104b474 100644
> --- a/arch/arm/mach-shmobile/setup-r8a7740.c
> +++ b/arch/arm/mach-shmobile/setup-r8a7740.c
> @@ -906,7 +906,6 @@ DT_MACHINE_START(R8A7740_DT, "Generic R8A7740 (Flattened Device Tree)")
> .init_irq = r8a7740_init_irq,
> .handle_irq = shmobile_handle_irq_intc,
> .init_machine = r8a7740_add_standard_devices_dt,
> - .init_time = shmobile_timer_init,
> .dt_compat = r8a7740_boards_compat_dt,
> MACHINE_END
>
> diff --git a/arch/arm/mach-shmobile/setup-sh7372.c b/arch/arm/mach-shmobile/setup-sh7372.c
> index 59c7146..5502d62 100644
> --- a/arch/arm/mach-shmobile/setup-sh7372.c
> +++ b/arch/arm/mach-shmobile/setup-sh7372.c
> @@ -1175,7 +1175,6 @@ DT_MACHINE_START(SH7372_DT, "Generic SH7372 (Flattened Device Tree)")
> .init_irq = sh7372_init_irq,
> .handle_irq = shmobile_handle_irq_intc,
> .init_machine = sh7372_add_standard_devices_dt,
> - .init_time = shmobile_timer_init,
> .dt_compat = sh7372_boards_compat_dt,
> MACHINE_END
>
> diff --git a/arch/arm/mach-shmobile/setup-sh73a0.c b/arch/arm/mach-shmobile/setup-sh73a0.c
> index bdab575..ea66316 100644
> --- a/arch/arm/mach-shmobile/setup-sh73a0.c
> +++ b/arch/arm/mach-shmobile/setup-sh73a0.c
> @@ -923,7 +923,6 @@ DT_MACHINE_START(SH73A0_DT, "Generic SH73A0 (Flattened Device Tree)")
> .nr_irqs = NR_IRQS_LEGACY,
> .init_irq = sh73a0_init_irq_dt,
> .init_machine = sh73a0_add_standard_devices_dt,
> - .init_time = shmobile_timer_init,
> .dt_compat = sh73a0_boards_compat_dt,
> MACHINE_END
> #endif /* CONFIG_USE_OF */
> diff --git a/arch/arm/mach-shmobile/timer.c b/arch/arm/mach-shmobile/timer.c
> index 3d16d4d..add2f15 100644
> --- a/arch/arm/mach-shmobile/timer.c
> +++ b/arch/arm/mach-shmobile/timer.c
> @@ -60,9 +60,3 @@ void __init shmobile_earlytimer_init(void)
> {
> late_time_init = shmobile_late_time_init;
> }
> -
> -void __init shmobile_timer_init(void)
> -{
> - arch_timer_of_register();
> - arch_timer_sched_clock_init();
> -}
> diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c
> index d0ad789..6215717 100644
> --- a/arch/arm/mach-vexpress/v2m.c
> +++ b/arch/arm/mach-vexpress/v2m.c
> @@ -1,6 +1,7 @@
> /*
> * Versatile Express V2M Motherboard Support
> */
> +#include <linux/clocksource.h>
> #include <linux/device.h>
> #include <linux/amba/bus.h>
> #include <linux/amba/mmci.h>
> @@ -23,7 +24,6 @@
> #include <linux/regulator/machine.h>
> #include <linux/vexpress.h>
>
> -#include <asm/arch_timer.h>
> #include <asm/mach-types.h>
> #include <asm/sizes.h>
> #include <asm/mach/arch.h>
> @@ -446,10 +446,7 @@ static void __init v2m_dt_timer_init(void)
> irq_of_parse_and_map(node, 0));
> }
>
> - arch_timer_of_register();
> -
> - if (arch_timer_sched_clock_init() != 0)
> - versatile_sched_clock_init(vexpress_get_24mhz_clock_base(),
> + versatile_sched_clock_init(vexpress_get_24mhz_clock_base(),
> 24000000);
> }
>
> diff --git a/arch/arm/mach-virt/virt.c b/arch/arm/mach-virt/virt.c
> index 31666f6..adc0945 100644
> --- a/arch/arm/mach-virt/virt.c
> +++ b/arch/arm/mach-virt/virt.c
> @@ -23,21 +23,13 @@
> #include <linux/of_platform.h>
> #include <linux/smp.h>
>
> -#include <asm/arch_timer.h>
> #include <asm/mach/arch.h>
> -#include <asm/mach/time.h>
>
> static void __init virt_init(void)
> {
> of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
> }
>
> -static void __init virt_timer_init(void)
> -{
> - WARN_ON(arch_timer_of_register() != 0);
> - WARN_ON(arch_timer_sched_clock_init() != 0);
> -}
> -
> static const char *virt_dt_match[] = {
> "linux,dummy-virt",
> NULL
> @@ -47,7 +39,6 @@ extern struct smp_operations virt_smp_ops;
>
> DT_MACHINE_START(VIRT, "Dummy Virtual Machine")
> .init_irq = irqchip_init,
> - .init_time = virt_timer_init,
> .init_machine = virt_init,
> .smp = smp_ops(virt_smp_ops),
> .dt_compat = virt_dt_match,
> diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h
> index 91e2a6a..bf6ab242 100644
> --- a/arch/arm64/include/asm/arch_timer.h
> +++ b/arch/arm64/include/asm/arch_timer.h
> @@ -130,4 +130,9 @@ static inline u64 arch_counter_get_cntvct(void)
> return cval;
> }
>
> +static inline int arch_timer_arch_init(void)
> +{
> + return 0;
> +}
> +
> #endif
> diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c
> index b0ef18d..a551f88 100644
> --- a/arch/arm64/kernel/time.c
> +++ b/arch/arm64/kernel/time.c
> @@ -32,6 +32,7 @@
> #include <linux/timer.h>
> #include <linux/irq.h>
> #include <linux/delay.h>
> +#include <linux/clocksource.h>
>
> #include <clocksource/arm_arch_timer.h>
>
> @@ -77,10 +78,11 @@ void __init time_init(void)
> {
> u32 arch_timer_rate;
>
> - if (arch_timer_init())
> - panic("Unable to initialise architected timer.\n");
> + clocksource_of_init();
>
> arch_timer_rate = arch_timer_get_rate();
> + if (!arch_timer_rate)
> + panic("Unable to initialise architected timer.\n");
>
> /* Cache the sched_clock multiplier to save a divide in the hot path. */
> sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> index e507ab7..d98e7e1 100644
> --- a/drivers/clocksource/Kconfig
> +++ b/drivers/clocksource/Kconfig
> @@ -62,6 +62,7 @@ config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
>
> config ARM_ARCH_TIMER
> bool
> + select CLKSRC_OF if OF
>
> config CLKSRC_METAG_GENERIC
> def_bool y if METAG
> diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
> index d7ad425..122ff05 100644
> --- a/drivers/clocksource/arm_arch_timer.c
> +++ b/drivers/clocksource/arm_arch_timer.c
> @@ -337,22 +337,14 @@ out:
> return err;
> }
>
> -static const struct of_device_id arch_timer_of_match[] __initconst = {
> - { .compatible = "arm,armv7-timer", },
> - { .compatible = "arm,armv8-timer", },
> - {},
> -};
> -
> -int __init arch_timer_init(void)
> +static void __init arch_timer_init(struct device_node *np)
> {
> - struct device_node *np;
> u32 freq;
> int i;
>
> - np = of_find_matching_node(NULL, arch_timer_of_match);
> - if (!np) {
> - pr_err("arch_timer: can't find DT node\n");
> - return -ENODEV;
> + if (arch_timer_get_rate()) {
> + pr_warn("arch_timer: multiple nodes in dt, skipping\n");
> + return;
> }
>
> /* Try to determine the frequency from the device tree or CNTFRQ */
> @@ -378,7 +370,7 @@ int __init arch_timer_init(void)
> if (!arch_timer_ppi[PHYS_SECURE_PPI] ||
> !arch_timer_ppi[PHYS_NONSECURE_PPI]) {
> pr_warn("arch_timer: No interrupt available, giving up\n");
> - return -EINVAL;
> + return;
> }
> }
>
> @@ -387,5 +379,8 @@ int __init arch_timer_init(void)
> else
> arch_timer_read_counter = arch_counter_get_cntpct;
>
> - return arch_timer_register();
> + arch_timer_register();
> + arch_timer_arch_init();
> }
> +CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_init);
> +CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_init);
> diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h
> index 2603267..e6c9c4c 100644
> --- a/include/clocksource/arm_arch_timer.h
> +++ b/include/clocksource/arm_arch_timer.h
> @@ -31,18 +31,12 @@
>
> #ifdef CONFIG_ARM_ARCH_TIMER
>
> -extern int arch_timer_init(void);
> extern u32 arch_timer_get_rate(void);
> extern u64 (*arch_timer_read_counter)(void);
> extern struct timecounter *arch_timer_get_timecounter(void);
>
> #else
>
> -static inline int arch_timer_init(void)
> -{
> - return -ENXIO;
> -}
> -
> static inline u32 arch_timer_get_rate(void)
> {
> return 0;
> --
> 1.7.10.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-sh" in
> the body of a message to majordomo at vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>