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psci: add features/reset2 support

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Adds support for:
* PSCI_FEATURES, which was introduced in PSCI 1.0. This provides API
that allows discovering whether a specific PSCI function is implemented
and its features.
* SYSTEM_RESET2, which was introduced in PSCI 1.1, which extends existing
SYSTEM_RESET. It provides support for vendor-specific resets, providing
reset_type as an additional param.

For additional details visit [1].

Implementations of some functions were borrowed from Linux PSCI driver
code [2].

[1] https://developer.arm.com/documentation/den0022/latest/
[2] drivers/firmware/psci/psci.c

Signed-off-by: Igor Opaniuk <igor.opaniuk@foundries.io>
This commit is contained in:
Igor Opaniuk 2021-04-01 02:01:53 +03:00 • committed by Tom Rini
parent 2963d606bc
commit b7135b034f
2 changed files with 71 additions and 0 deletions
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3
include/linux/psci.h
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@ -118,6 +118,9 @@
#ifdef CONFIG_ARM_PSCI_FW
unsigned long invoke_psci_fn(unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3);
void psci_sys_reset(u32 type);
void psci_sys_poweroff(void);
#else
static inline unsigned long invoke_psci_fn(unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3)