[PATCH 13/34] sunxi: spl: add support for Allwinner A523 watchdog

[Jernej Škrabec]

Dne nedelja, 23. marec 2025 ob 12:35:23 Srednjeevropski standardni čas je Andre Przywara napisal(a):
> From: Jernej Skrabec <jernej.skrabec at gmail.com>
> 
> The watchdog in the Allwinner A523 SoC differs a bit from the one in the
> previous SoCs: it lives in a separate register frame, so no longer
> inside some timer device, and it manages to shuffle around some
> registers a bit.
> 
> Provide a new struct describing the register layout, and adjust the
> address calculation in the SPL code accoringly. This is guarded by the
> MACH_SUN55I_A523 Kconfig variable.

This one is missing SoB, apparently by me :)

> ---
>  arch/arm/include/asm/arch-sunxi/watchdog.h | 12 ++++++++++++
>  arch/arm/mach-sunxi/board.c                |  6 ++++++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/arch/arm/include/asm/arch-sunxi/watchdog.h b/arch/arm/include/asm/arch-sunxi/watchdog.h
> index 38e2ef2aca3..96d5725141e 100644
> --- a/arch/arm/include/asm/arch-sunxi/watchdog.h
> +++ b/arch/arm/include/asm/arch-sunxi/watchdog.h
> @@ -26,6 +26,18 @@ struct sunxi_wdog {
>  	u32 res[2];
>  };
>  
> +#elif defined(CONFIG_MACH_SUN55I_A523)
> +
> +struct sunxi_wdog {
> +	u32 irq_en;		/* 0x00 */
> +	u32 irq_sta;		/* 0x04 */
> +	u32 srst;		/* 0x08 */
> +	u32 ctl;		/* 0x0c */
> +	u32 cfg;		/* 0x10 */
> +	u32 mode;		/* 0x14 */
> +	u32 ocfg;		/* 0x18 */
> +};

Anyway, since you announced battle against C structures for register
layout, it seems contraproductive to add it here. What do you think?

Best regards,
Jernej

> +
>  #else
>  
>  #define WDT_CFG_RESET		(0x1)
> diff --git a/arch/arm/mach-sunxi/board.c b/arch/arm/mach-sunxi/board.c
> index 701899ee4b2..89aea61e8e8 100644
> --- a/arch/arm/mach-sunxi/board.c
> +++ b/arch/arm/mach-sunxi/board.c
> @@ -495,6 +495,12 @@ void reset_cpu(void)
>  		/* sun5i sometimes gets stuck without this */
>  		writel(WDT_MODE_RESET_EN | WDT_MODE_EN, &wdog->mode);
>  	}
> +#elif defined(CONFIG_MACH_SUN55I_A523)
> +	static const struct sunxi_wdog *wdog =
> +		(struct sunxi_wdog *)SUNXI_TIMER_BASE;
> +
> +	writel(WDT_CTRL_KEY | WDT_CTRL_RESTART, &wdog->srst);
> +	while (1) { }
>  #elif defined(CONFIG_SUNXI_GEN_SUN6I) || defined(CONFIG_SUN50I_GEN_H6) || defined(CONFIG_SUNXI_GEN_NCAT2)
>  #if defined(CONFIG_MACH_SUN50I_H6)
>  	/* WDOG is broken for some H6 rev. use the R_WDOG instead */
>