[U-Boot] [PATCH v1 0/2] Allow platform specific service handling on PSCI

[Tom Rini <trini@konsulko.com>]

On Tue, Feb 12, 2019 at 12:27:01AM -0800, chee.hong.ang at intel.com wrote:

> From: "Ang, Chee Hong" <chee.hong.ang@intel.com>
> 
> Currently u-boot only support standard PSCI functions for power management
> and lack of convenient method to allow the users to extend the PSCI functions
> to support platform specific services. Most of the u-boot users still rely
> on ATF (ARM Trusted Firmware) to handle the standard power management and
> platform specific PSCI services.
> The purpose of this patchsets is to allow u-boot users to support their
> own platform specific secure SMC/PSCI services without making any
> SMC calls to ATF. This will benefit the users who need to use u-boot as the
> only bootloader and secure service provider without relying on ATF.
> 
> Below is a simple code example for adding your own PSCI functions:
> 
> #include <common.h>
> #include <errno.h>
> #include <asm/io.h>
> #include <asm/psci.h>
> #include <asm/secure.h>
> 
> #define PSCI_SMC64_FUNC_ID1	0xC2000001
> #define PSCI_SMC64_FUNC_ID2	0xC2000002
> 
> static void __secure psci_plat_specific_func1(unsigned long function_id)
> {
> 	/* Your code for handling the SMC/PSCI platform specific service 1 */
> }
> 
> static void __secure psci_plat_specific_func2(unsigned long function_id)
> {
> 	/* Your code for handling the SMC/PSCI platform specific service 2 */
> }
> 
> DECLARE_SECURE_SVC(plat_specific_func1, PSCI_SMC64_FUNC_ID1,
> 		   psci_plat_specific_func1);
> DECLARE_SECURE_SVC(plat_specific_func2, PSCI_SMC64_FUNC_ID2,
> 		   psci_plat_specific_func2);
> 
> Ang, Chee Hong (1):
>   ARMv8: Disable fwcall when PSCI is enabled
> 
> Chee Hong Ang (1):
>   ARMv8: Allow SiP service extensions on top of PSCI code

Conceptually, I suppose this is a logical step.  In specifics, would we
want to make this functionality opt-in, or no, that doesn't make sense?

-- 
Tom
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