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Date: Wed, 23 Oct 2019 13:32:52 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Kukjin Kim <kgene@...nel.org>,
Kyungmin Park <kyungmin.park@...sung.com>,
linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linus.walleij@...aro.org,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Pankaj Dubey <pankaj.dubey@...sung.com>,
Marek Szyprowski <m.szyprowski@...sung.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/36] ARM: samsung: move pm check code to drivers/soc
On Thu, Oct 10, 2019 at 10:29:53PM +0200, Arnd Bergmann wrote:
> This is the only part of plat-samsung that is really
> shared between the s3c and s5p ports. Moving it to
> drivers/soc/ lets us make them completely independent.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> arch/arm/mach-s5pv210/Kconfig | 1 +
> arch/arm/plat-samsung/Kconfig | 49 +----------
> arch/arm/plat-samsung/Makefile | 2 -
> .../arm/plat-samsung/include/plat/pm-common.h | 70 +---------------
> drivers/soc/samsung/Kconfig | 48 ++++++++++-
> drivers/soc/samsung/Makefile | 3 +
> .../soc/samsung/s3c-pm-check.c | 2 +-
> .../soc/samsung/s3c-pm-debug.c | 3 +-
> include/linux/soc/samsung/s3c-pm.h | 84 +++++++++++++++++++
> 9 files changed, 139 insertions(+), 123 deletions(-)
> rename arch/arm/plat-samsung/pm-check.c => drivers/soc/samsung/s3c-pm-check.c (99%)
> rename arch/arm/plat-samsung/pm-debug.c => drivers/soc/samsung/s3c-pm-debug.c (97%)
> create mode 100644 include/linux/soc/samsung/s3c-pm.h
>
> diff --git a/arch/arm/mach-s5pv210/Kconfig b/arch/arm/mach-s5pv210/Kconfig
> index 03984a791879..d2b0e64bad7e 100644
> --- a/arch/arm/mach-s5pv210/Kconfig
> +++ b/arch/arm/mach-s5pv210/Kconfig
> @@ -18,6 +18,7 @@ config ARCH_S5PV210
> select HAVE_S3C_RTC if RTC_CLASS
> select PINCTRL
> select PINCTRL_EXYNOS
> + select SOC_SAMSUNG
> help
> Samsung S5PV210/S5PC110 series based systems
>
> diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
> index e31a156a27df..740bdb23f38a 100644
> --- a/arch/arm/plat-samsung/Kconfig
> +++ b/arch/arm/plat-samsung/Kconfig
> @@ -8,6 +8,7 @@ config PLAT_SAMSUNG
> default y
> select GENERIC_IRQ_CHIP
> select NO_IOPORT_MAP
> + select SOC_SAMSUNG
> help
> Base platform code for all Samsung SoC based systems
>
> @@ -234,54 +235,6 @@ config SAMSUNG_PM_GPIO
> pinctrl-samsung driver.
> endif
>
> -comment "Power management"
> -
> -config SAMSUNG_PM_DEBUG
> - bool "Samsung PM Suspend debug"
> - depends on PM && DEBUG_KERNEL
> - depends on PLAT_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
> - depends on DEBUG_S3C24XX_UART || DEBUG_S3C2410_UART
> - help
> - Say Y here if you want verbose debugging from the PM Suspend and
> - Resume code. See <file:Documentation/arm/samsung-s3c24xx/suspend.rst>
> - for more information.
> -
> -config S3C_PM_DEBUG_LED_SMDK
> - bool "SMDK LED suspend/resume debugging"
> - depends on PM && (MACH_SMDK6410)
> - help
> - Say Y here to enable the use of the SMDK LEDs on the baseboard
> - for debugging of the state of the suspend and resume process.
> -
> - Note, this currently only works for S3C64XX based SMDK boards.
> -
> -config SAMSUNG_PM_CHECK
> - bool "S3C2410 PM Suspend Memory CRC"
> - depends on PM && (PLAT_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210)
> - select CRC32
> - help
> - Enable the PM code's memory area checksum over sleep. This option
> - will generate CRCs of all blocks of memory, and store them before
> - going to sleep. The blocks are then checked on resume for any
> - errors.
> -
> - Note, this can take several seconds depending on memory size
> - and CPU speed.
> -
> - See <file:Documentation/arm/samsung-s3c24xx/suspend.rst>
> -
> -config SAMSUNG_PM_CHECK_CHUNKSIZE
> - int "S3C2410 PM Suspend CRC Chunksize (KiB)"
> - depends on PM && SAMSUNG_PM_CHECK
> - default 64
> - help
> - Set the chunksize in Kilobytes of the CRC for checking memory
> - corruption over suspend and resume. A smaller value will mean that
> - the CRC data block will take more memory, but will identify any
> - faults with better precision.
> -
> - See <file:Documentation/arm/samsung-s3c24xx/suspend.rst>
> -
> config SAMSUNG_WAKEMASK
> bool
> depends on PM
> diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
> index 3db9d2c38258..d88b9b84f3a9 100644
> --- a/arch/arm/plat-samsung/Makefile
> +++ b/arch/arm/plat-samsung/Makefile
> @@ -28,8 +28,6 @@ obj-$(CONFIG_PM_SLEEP) += pm-common.o
> obj-$(CONFIG_EXYNOS_CPU_SUSPEND) += pm-common.o
> obj-$(CONFIG_SAMSUNG_PM) += pm.o
> obj-$(CONFIG_SAMSUNG_PM_GPIO) += pm-gpio.o
> -obj-$(CONFIG_SAMSUNG_PM_CHECK) += pm-check.o
> -obj-$(CONFIG_SAMSUNG_PM_DEBUG) += pm-debug.o
>
> obj-$(CONFIG_SAMSUNG_WAKEMASK) += wakeup-mask.o
> obj-$(CONFIG_SAMSUNG_WDT_RESET) += watchdog-reset.o
> diff --git a/arch/arm/plat-samsung/include/plat/pm-common.h b/arch/arm/plat-samsung/include/plat/pm-common.h
> index 87fa97fd6e8b..18b9607e1e39 100644
> --- a/arch/arm/plat-samsung/include/plat/pm-common.h
> +++ b/arch/arm/plat-samsung/include/plat/pm-common.h
> @@ -11,6 +11,7 @@
> #define __PLAT_SAMSUNG_PM_COMMON_H __FILE__
>
> #include <linux/irq.h>
> +#include <linux/soc/samsung/s3c-pm.h>
>
> /* sleep save info */
>
> @@ -36,73 +37,4 @@ extern void s3c_pm_do_save(struct sleep_save *ptr, int count);
> extern void s3c_pm_do_restore(const struct sleep_save *ptr, int count);
> extern void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count);
>
> -/* PM debug functions */
> -
> -/**
> - * struct pm_uart_save - save block for core UART
> - * @ulcon: Save value for S3C2410_ULCON
> - * @ucon: Save value for S3C2410_UCON
> - * @ufcon: Save value for S3C2410_UFCON
> - * @umcon: Save value for S3C2410_UMCON
> - * @ubrdiv: Save value for S3C2410_UBRDIV
> - *
> - * Save block for UART registers to be held over sleep and restored if they
> - * are needed (say by debug).
> -*/
> -struct pm_uart_save {
> - u32 ulcon;
> - u32 ucon;
> - u32 ufcon;
> - u32 umcon;
> - u32 ubrdiv;
> - u32 udivslot;
> -};
> -
> -#ifdef CONFIG_SAMSUNG_PM_DEBUG
> -/**
> - * s3c_pm_dbg() - low level debug function for use in suspend/resume.
> - * @msg: The message to print.
> - *
> - * This function is used mainly to debug the resume process before the system
> - * can rely on printk/console output. It uses the low-level debugging output
> - * routine printascii() to do its work.
> - */
> -extern void s3c_pm_dbg(const char *msg, ...);
> -
> -#define S3C_PMDBG(fmt...) s3c_pm_dbg(fmt)
> -
> -extern void s3c_pm_save_uarts(bool is_s3c24xx);
> -extern void s3c_pm_restore_uarts(bool is_s3c24xx);
> -
> -#ifdef CONFIG_ARCH_S3C64XX
> -extern void s3c_pm_arch_update_uart(void __iomem *regs,
> - struct pm_uart_save *save);
> -#else
> -static inline void
> -s3c_pm_arch_update_uart(void __iomem *regs, struct pm_uart_save *save)
> -{
> -}
> -#endif
> -
> -#else
> -#define S3C_PMDBG(fmt...) pr_debug(fmt)
> -
> -static inline void s3c_pm_save_uarts(bool is_s3c24xx) { }
> -static inline void s3c_pm_restore_uarts(bool is_s3c24xx) { }
> -#endif
> -
> -/* suspend memory checking */
> -
> -#ifdef CONFIG_SAMSUNG_PM_CHECK
> -extern void s3c_pm_check_prepare(void);
> -extern void s3c_pm_check_restore(void);
> -extern void s3c_pm_check_cleanup(void);
> -extern void s3c_pm_check_store(void);
> -#else
> -#define s3c_pm_check_prepare() do { } while (0)
> -#define s3c_pm_check_restore() do { } while (0)
> -#define s3c_pm_check_cleanup() do { } while (0)
> -#define s3c_pm_check_store() do { } while (0)
> -#endif
> -
> #endif
> diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig
> index 33ad0de2de3c..0ea7402ffba3 100644
> --- a/drivers/soc/samsung/Kconfig
> +++ b/drivers/soc/samsung/Kconfig
> @@ -25,6 +25,52 @@ config EXYNOS_PMU_ARM_DRIVERS
>
> config EXYNOS_PM_DOMAINS
> bool "Exynos PM domains" if COMPILE_TEST
> - depends on PM_GENERIC_DOMAINS || COMPILE_TEST
> + depends on (ARCH_EXYNOS && PM_GENERIC_DOMAINS) || COMPILE_TEST
> +
> +config SAMSUNG_PM_DEBUG
> + bool "Samsung PM Suspend debug"
> + depends on PM && DEBUG_KERNEL
> + depends on PLAT_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
> + depends on DEBUG_S3C24XX_UART || DEBUG_S3C2410_UART
> + help
> + Say Y here if you want verbose debugging from the PM Suspend and
> + Resume code. See <file:Documentation/arm/samsung-s3c24xx/suspend.rst>
> + for more information.
> +
> +config S3C_PM_DEBUG_LED_SMDK
> + bool "SMDK LED suspend/resume debugging"
> + depends on PM && (MACH_SMDK6410)
> + help
> + Say Y here to enable the use of the SMDK LEDs on the baseboard
> + for debugging of the state of the suspend and resume process.
> +
> + Note, this currently only works for S3C64XX based SMDK boards.
> +
> +config SAMSUNG_PM_CHECK
> + bool "S3C2410 PM Suspend Memory CRC"
> + depends on PM && (PLAT_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210)
> + select CRC32
> + help
> + Enable the PM code's memory area checksum over sleep. This option
> + will generate CRCs of all blocks of memory, and store them before
> + going to sleep. The blocks are then checked on resume for any
> + errors.
> +
> + Note, this can take several seconds depending on memory size
> + and CPU speed.
> +
> + See <file:Documentation/arm/samsung-s3c24xx/suspend.rst>
> +
> +config SAMSUNG_PM_CHECK_CHUNKSIZE
> + int "S3C2410 PM Suspend CRC Chunksize (KiB)"
> + depends on PM && SAMSUNG_PM_CHECK
> + default 64
> + help
> + Set the chunksize in Kilobytes of the CRC for checking memory
> + corruption over suspend and resume. A smaller value will mean that
> + the CRC data block will take more memory, but will identify any
> + faults with better precision.
> +
> + See <file:Documentation/arm/samsung-s3c24xx/suspend.rst>
>
> endif
> diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile
> index 3b6a8797416c..88ae7a522055 100644
> --- a/drivers/soc/samsung/Makefile
> +++ b/drivers/soc/samsung/Makefile
> @@ -6,3 +6,6 @@ obj-$(CONFIG_EXYNOS_PMU) += exynos-pmu.o
> obj-$(CONFIG_EXYNOS_PMU_ARM_DRIVERS) += exynos3250-pmu.o exynos4-pmu.o \
> exynos5250-pmu.o exynos5420-pmu.o
> obj-$(CONFIG_EXYNOS_PM_DOMAINS) += pm_domains.o
> +
> +obj-$(CONFIG_SAMSUNG_PM_CHECK) += s3c-pm-check.o
> +obj-$(CONFIG_SAMSUNG_PM_DEBUG) += s3c-pm-debug.o
> diff --git a/arch/arm/plat-samsung/pm-check.c b/drivers/soc/samsung/s3c-pm-check.c
> similarity index 99%
> rename from arch/arm/plat-samsung/pm-check.c
> rename to drivers/soc/samsung/s3c-pm-check.c
> index cd2c02c68bc3..ff3e099fc208 100644
> --- a/arch/arm/plat-samsung/pm-check.c
> +++ b/drivers/soc/samsung/s3c-pm-check.c
> @@ -15,7 +15,7 @@
> #include <linux/ioport.h>
> #include <linux/slab.h>
>
> -#include <plat/pm-common.h>
> +#include <linux/soc/samsung/s3c-pm.h>
>
> #if CONFIG_SAMSUNG_PM_CHECK_CHUNKSIZE < 1
> #error CONFIG_SAMSUNG_PM_CHECK_CHUNKSIZE must be a positive non-zero value
> diff --git a/arch/arm/plat-samsung/pm-debug.c b/drivers/soc/samsung/s3c-pm-debug.c
> similarity index 97%
> rename from arch/arm/plat-samsung/pm-debug.c
> rename to drivers/soc/samsung/s3c-pm-debug.c
> index 482d53753e93..b5ce0e9a41e5 100644
> --- a/arch/arm/plat-samsung/pm-debug.c
> +++ b/drivers/soc/samsung/s3c-pm-debug.c
> @@ -15,8 +15,7 @@
>
> #include <asm/mach/map.h>
>
> -#include <plat/cpu.h>
> -#include <plat/pm-common.h>
> +#include <linux/soc/samsung/s3c-pm.h>
>
> static struct pm_uart_save uart_save;
>
> diff --git a/include/linux/soc/samsung/s3c-pm.h b/include/linux/soc/samsung/s3c-pm.h
> new file mode 100644
> index 000000000000..d477b314d034
> --- /dev/null
> +++ b/include/linux/soc/samsung/s3c-pm.h
> @@ -0,0 +1,84 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2013 Samsung Electronics Co., Ltd.
> + * Tomasz Figa <t.figa@...sung.com>
> + * Copyright (c) 2004 Simtec Electronics
> + * http://armlinux.simtec.co.uk/
> + * Written by Ben Dooks, <ben@...tec.co.uk>
> + */
> +
> +#ifndef __SAMSUNG_SOC_S3C_PM_H
> +#define __SAMSUNG_SOC_S3C_PM_H __FILE__
Use guard name prefix consistent with other files, so:
__LINUX_SOC_SAMSUNG_S3C_PM_H
Rest looks good.
Best regards,
Krzysztof
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