[PATCH] mx7ulp: add getting a board serial number

[Tom Rini]

On Mon, Aug 30, 2021 at 04:57:16PM +0300, Oleksandr Suvorov wrote:

> From: Ricardo Salveti <ricardo at foundries.io>
> 
> Get Unique ID of SoC iMX7ULP, using the logic described in Fusemap
> (IMX7ULPRMB2_Rev0_Fusemap) attached in the i.MX 7ULP APRM [1].
> 
> [1]
> https://www.nxp.com/docs/en/reference-manual/IMX7ULPRMB2.pdf
> 
> Signed-off-by: Ricardo Salveti <ricardo at foundries.io>
> Co-developed-by: Oleksandr Suvorov <oleksandr.suvorov at foundries.io>
> Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov at foundries.io>
> ---
> 
>  arch/arm/mach-imx/mx7ulp/soc.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/arch/arm/mach-imx/mx7ulp/soc.c b/arch/arm/mach-imx/mx7ulp/soc.c
> index 320f24dd29..d088ee093d 100644
> --- a/arch/arm/mach-imx/mx7ulp/soc.c
> +++ b/arch/arm/mach-imx/mx7ulp/soc.c
> @@ -13,6 +13,7 @@
>  #include <asm/arch/sys_proto.h>
>  #include <asm/mach-imx/boot_mode.h>
>  #include <asm/mach-imx/hab.h>
> +#include <asm/setup.h>
>  #include <linux/bitops.h>
>  
>  #define PMC0_BASE_ADDR		0x410a1000
> @@ -363,3 +364,25 @@ enum boot_device get_boot_device(void)
>  
>  	return boot_dev;
>  }
> +
> +#ifdef CONFIG_SERIAL_TAG
> +/*
> + * OCOTP_CFG (SJC CHALLENGE, Unique ID)
> + * i.MX 7ULP Applications Processor Reference Manual, Rev. 0, 09/2020
> + *
> + * OCOTP_CFG0 offset 0x4B0: 15:0 -> 15:0  bits of Unique ID
> + * OCOTP_CFG1 offset 0x4C0: 15:0 -> 31:16 bits of Unique ID
> + * OCOTP_CFG2 offset 0x4D0: 15:0 -> 47:32 bits of Unique ID
> + * OCOTP_CFG3 offset 0x4E0: 15:0 -> 63:48 bits of Unique ID
> + */
> +void get_board_serial(struct tag_serialnr *serialnr)
> +{
> +	struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
> +	struct fuse_bank *bank = &ocotp->bank[1];
> +	struct fuse_bank1_regs *fuse =
> +		(struct fuse_bank1_regs *)bank->fuse_regs;
> +
> +	serialnr->low = (fuse->cfg0 & 0xFFFF) + ((fuse->cfg1 & 0xFFFF) << 16);
> +	serialnr->high = (fuse->cfg2 & 0xFFFF) + ((fuse->cfg3 & 0xFFFF) << 16);
> +}
> +#endif

It's not either of your fault that CONFIG_SERIAL_TAG has been abused for
so long.  Please rework this on top of:
https://patchwork.ozlabs.org/project/uboot/list/?series=260161

Or, since I plan to pull that in to -next soon, circle back to this
problem in a week or two.

-- 
Tom
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