linux-kernel - Re: [PATCH] power: reset: ocelot: switch the SI to boot mode

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Message-ID: <20181205214642.fyuody7yzv6ioiqd@earth.universe>
Date:   Wed, 5 Dec 2018 22:46:42 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     UNGLinuxDriver@...rochip.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] power: reset: ocelot: switch the SI to boot mode

Hi,

On Fri, Nov 09, 2018 at 08:57:00PM +0100, Alexandre Belloni wrote:
> Switch the SI to boot mode so on a warm reboot, the SI is able to access
> the flash.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> ---

Thanks, queued.

-- Sebastian

>  drivers/power/reset/ocelot-reset.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/power/reset/ocelot-reset.c b/drivers/power/reset/ocelot-reset.c
> index 5a13a5cc8188..419952c61fd0 100644
> --- a/drivers/power/reset/ocelot-reset.c
> +++ b/drivers/power/reset/ocelot-reset.c
> @@ -26,6 +26,13 @@ struct ocelot_reset_context {
>  
>  #define SOFT_CHIP_RST BIT(0)
>  
> +#define ICPU_CFG_CPU_SYSTEM_CTRL_GENERAL_CTRL	0x24
> +#define IF_SI_OWNER_MASK			GENMASK(1, 0)
> +#define IF_SI_OWNER_SISL			0
> +#define IF_SI_OWNER_SIBM			1
> +#define IF_SI_OWNER_SIMC			2
> +#define IF_SI_OWNER_OFFSET			4
> +
>  static int ocelot_restart_handle(struct notifier_block *this,
>  				 unsigned long mode, void *cmd)
>  {
> @@ -37,6 +44,11 @@ static int ocelot_restart_handle(struct notifier_block *this,
>  	regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_RESET,
>  			   CORE_RST_PROTECT, 0);
>  
> +	/* Make the SI back to boot mode */
> +	regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_GENERAL_CTRL,
> +			   IF_SI_OWNER_MASK << IF_SI_OWNER_OFFSET,
> +			   IF_SI_OWNER_SIBM << IF_SI_OWNER_OFFSET);
> +
>  	writel(SOFT_CHIP_RST, ctx->base);
>  
>  	pr_emerg("Unable to restart system\n");
> -- 
> 2.19.1
> 

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