linux-kernel - Re: [PATCH v2 4/5] ARM: EXYNOS: add exynos_get_boot

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Date:	Wed, 18 Mar 2015 14:43:49 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:	Kukjin Kim <kgene.kim@...sung.com>, Kukjin Kim <kgene@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Colin Cross <ccross@...gle.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [PATCH v2 4/5] ARM: EXYNOS: add exynos_get_boot_addr() helper

2015-03-18 14:09 GMT+01:00 Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>:
> Add get_cpu_boot_addr() firmware operation and then
> exynos_get_boot_addr() helper.
>
> This is a preparation for adding coupled cpuidle support
> for Exynos3250 SoC.
>
> There should be no functional changes caused by this patch.
>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> Cc: Russell King <rmk+kernel@....linux.org.uk>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
>  arch/arm/include/asm/firmware.h |  4 ++++
>  arch/arm/mach-exynos/firmware.c | 17 +++++++++++++++++
>  arch/arm/mach-exynos/platsmp.c  | 25 +++++++++++++++++++++++++
>  3 files changed, 46 insertions(+)
>
> diff --git a/arch/arm/include/asm/firmware.h b/arch/arm/include/asm/firmware.h
> index 89aefe1..34c1d96 100644
> --- a/arch/arm/include/asm/firmware.h
> +++ b/arch/arm/include/asm/firmware.h
> @@ -34,6 +34,10 @@ struct firmware_ops {
>          */
>         int (*set_cpu_boot_addr)(int cpu, unsigned long boot_addr);
>         /*
> +        * Gets boot address of specified physical CPU
> +        */
> +       int (*get_cpu_boot_addr)(int cpu, unsigned long *boot_addr);
> +       /*
>          * Boots specified physical CPU
>          */
>         int (*cpu_boot)(int cpu);
> diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
> index f236877..c9e4481 100644
> --- a/arch/arm/mach-exynos/firmware.c
> +++ b/arch/arm/mach-exynos/firmware.c
> @@ -104,6 +104,22 @@ static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
>         return 0;
>  }
>
> +static int exynos_get_cpu_boot_addr(int cpu, unsigned long *boot_addr)
> +{
> +       void __iomem *boot_reg;
> +
> +       if (!sysram_ns_base_addr)
> +               return -ENODEV;
> +
> +       boot_reg = sysram_ns_base_addr + 0x1c;
> +
> +       if (soc_is_exynos4412())
> +               boot_reg += 4 * cpu;
> +
> +       *boot_addr = __raw_readl(boot_reg);
> +       return 0;
> +}
> +
>  static int exynos_cpu_suspend(unsigned long arg)
>  {
>         flush_cache_all();
> @@ -138,6 +154,7 @@ static int exynos_resume(void)
>  static const struct firmware_ops exynos_firmware_ops = {
>         .do_idle                = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_do_idle : NULL,
>         .set_cpu_boot_addr      = exynos_set_cpu_boot_addr,
> +       .get_cpu_boot_addr      = exynos_get_cpu_boot_addr,
>         .cpu_boot               = exynos_cpu_boot,
>         .suspend                = IS_ENABLED(CONFIG_PM_SLEEP) ? exynos_suspend : NULL,
>         .resume                 = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_resume : NULL,
> diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c
> index b7cfcdc..449edd1 100644
> --- a/arch/arm/mach-exynos/platsmp.c
> +++ b/arch/arm/mach-exynos/platsmp.c
> @@ -272,6 +272,31 @@ fail:
>         return ret;
>  }
>
> +static int exynos_get_boot_addr(u32 core_id, unsigned long *boot_addr)
> +{
> +       int ret;
> +
> +       /*
> +        * Try to get boot address using firmware first
> +        * and fall back to boot register if it fails.
> +        */
> +       ret = call_firmware_op(get_cpu_boot_addr, core_id, boot_addr);
> +       if (ret && ret != -ENOSYS)
> +               goto fail;

The exynos_get_cpu_boot_addr() returns ENODEV. Do you really want to
check for ENOSYS here?

> +       if (ret == -ENOSYS) {
> +               void __iomem *boot_reg = cpu_boot_reg(core_id);
> +
> +               if (IS_ERR(boot_reg)) {
> +                       ret = PTR_ERR(boot_reg);
> +                       goto fail;
> +               }
--
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