[U-Boot] [PATCH V4 2/3] mx7: psci: add basic psci support

[Gary Bisson <gary.bisson@boundarydevices.com>]

Hi all,

Sorry to revive an old thread but I have some questions about thit patch.

On Fri, Oct 23, 2015 at 10:13:04AM +0800, Peng Fan wrote:
> 1. add basic psci support for imx7 chip.
> 2. support cpu_on and cpu_off.
> 3. switch to non-secure mode when boot linux kernel.
> 4. set csu allow accessing all peripherial register in non-secure mode.
> 
> Signed-off-by: Frank Li <Frank.Li@freescale.com>
> Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
> Cc: Stefano Babic <sbabic@denx.de>
> Cc: Fabio Estevam <fabio.estevam@freescale.com>
> ---
> [snip]
> diff --git a/arch/arm/include/asm/arch-mx7/imx-regs.h b/arch/arm/include/asm/arch-mx7/imx-regs.h
> index 4dc11ee..9213374 100644
> --- a/arch/arm/include/asm/arch-mx7/imx-regs.h
> +++ b/arch/arm/include/asm/arch-mx7/imx-regs.h
> @@ -866,6 +866,9 @@ struct cspi_regs {
>  	ECSPI3_BASE_ADDR, \
>  	ECSPI4_BASE_ADDR
>  
> +#define CSU_INIT_SEC_LEVEL0	0x00FF00FF
> +#define CSU_NUM_REGS		64

In the security documentation (revA) it is said that there are 40 CSL,
why is it 64 here?

Also, although this seems to work, later on when the kernel boots I get
the following CAAM errors:
caam 30900000.caam: failed to acquire DECO 0
...
caam 30900000.caam: failed to acquire DECO 0
caam 30900000.caam: failed to instantiate RNG
caam: probe of 30900000.caam failed with error -11

If I revert this patch and therefore leave the CSU to its default state
at bootup the above CAAM issue disappears, do you have any idea why?

As a FYI, I am using U-Boot v2016.03 + a few patches that adds support
for our i.MX7 Nitrogen7 board. You can find the repo here:
https://github.com/boundarydevices/u-boot-imx6/tree/boundary-v2016.03

Also, if I base U-Boot on top of NXP repo it works too since this csu/psci
support isn't there:
http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/tree/?id=rel_imx_3.14.52_1.1.0_ga

Regards,
Gary