[U-Boot] [PATCH v3] i.MX28: extend print_cpuinfo() to use chip information

[Marek Vasut <marex@denx.de>]

Dear Otavio Salvador,

> The information now is gathered from HW_DIGCTL_CHIPID register and
> includes the chip modem and revision on the output.
> 
> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

This one is OK with me, queue for next maybe?

Acked-by: Marek Vasut <marex@denx.de>

> ---
> Changes in v2:
> - use ?? for unidentified revision and cpu type
> - use numeric revisions
> 
> Changes in v3:
> - drop mx23 data as it will be posted in a later patch
> - fix info order (first rev, then clock)
> 
>  arch/arm/cpu/arm926ejs/mx28/mx28.c           |   38
> ++++++++++++++++++++++++-- arch/arm/include/asm/arch-mx28/regs-digctl.h | 
>   4 +++
>  2 files changed, 40 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/cpu/arm926ejs/mx28/mx28.c
> b/arch/arm/cpu/arm926ejs/mx28/mx28.c index ff25772..cf7a50f 100644
> --- a/arch/arm/cpu/arm926ejs/mx28/mx28.c
> +++ b/arch/arm/cpu/arm926ejs/mx28/mx28.c
> @@ -188,13 +188,47 @@ int arch_cpu_init(void)
>  }
> 
>  #if defined(CONFIG_DISPLAY_CPUINFO)
> +static const char *get_cpu_type(void)
> +{
> +	struct mx28_digctl_regs *digctl_regs =
> +		(struct mx28_digctl_regs *)MXS_DIGCTL_BASE;
> +
> +	switch (readl(&digctl_regs->hw_digctl_chipid) & HW_DIGCTL_CHIPID_MASK) {
> +	case HW_DIGCTL_CHIPID_MX28:
> +		return "28";
> +	default:
> +		return "??";
> +	}
> +}
> +
> +static const char *get_cpu_rev(void)
> +{
> +	struct mx28_digctl_regs *digctl_regs =
> +		(struct mx28_digctl_regs *)MXS_DIGCTL_BASE;
> +	uint8_t rev = readl(&digctl_regs->hw_digctl_chipid) & 0x000000FF;
> +
> +	switch (readl(&digctl_regs->hw_digctl_chipid) & HW_DIGCTL_CHIPID_MASK) {
> +	case HW_DIGCTL_CHIPID_MX28:
> +		switch (rev) {
> +		case 0x1:
> +			return "1.2";
> +		default:
> +			return "??";
> +		}
> +	default:
> +		return "??";
> +	}
> +}
> +
>  int print_cpuinfo(void)
>  {
>  	struct mx28_spl_data *data = (struct mx28_spl_data *)
>  		((CONFIG_SYS_TEXT_BASE - sizeof(struct mx28_spl_data)) & ~0xf);
> 
> -	printf("Freescale i.MX28 family at %d MHz\n",
> -			mxc_get_clock(MXC_ARM_CLK) / 1000000);
> +	printf("CPU:   Freescale i.MX%s rev%s at %d MHz\n",
> +		get_cpu_type(),
> +		get_cpu_rev(),
> +		mxc_get_clock(MXC_ARM_CLK) / 1000000);
>  	printf("BOOT:  %s\n", mx28_boot_modes[data->boot_mode_idx].mode);
>  	return 0;
>  }
> diff --git a/arch/arm/include/asm/arch-mx28/regs-digctl.h
> b/arch/arm/include/asm/arch-mx28/regs-digctl.h index 9a63594..247da6e
> 100644
> --- a/arch/arm/include/asm/arch-mx28/regs-digctl.h
> +++ b/arch/arm/include/asm/arch-mx28/regs-digctl.h
> @@ -152,4 +152,8 @@ struct mx28_digctl_regs {
>  };
>  #endif
> 
> +/* Product code identification */
> +#define HW_DIGCTL_CHIPID_MASK	(0xffff << 16)
> +#define HW_DIGCTL_CHIPID_MX28	(0x2800 << 16)
> +
>  #endif /* __MX28_REGS_DIGCTL_H__ */

Best regards,
Marek Vasut