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drivers: firmware: psci: add PSCI_FEATURES call

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PSCI v1.0 introduces a PSCI_FEATURES call that allows to probe for
features related to a specific function identifier.

This patch adds PSCI_FEATURES support to the PSCI firmware layer.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Jisheng Zhang <jszhang@marvell.com>
Cc: Mark Rutland <mark.rutland@arm.com>
This commit is contained in:
Lorenzo Pieralisi 2015-05-26 17:06:21 +01:00
parent 068654c200
commit 5f004e0c9f
2 changed files with 8 additions and 0 deletions
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6
drivers/firmware/psci.c
View file

@ -197,6 +197,12 @@ static void psci_sys_poweroff(void)
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
}
static int __init psci_features(u32 psci_func_id)
{
return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
psci_func_id, 0, 0);
}
/*
* Detect the presence of a resident Trusted OS which may cause CPU_OFF to
* return DENIED (which would be fatal).

2
include/uapi/linux/psci.h
View file

@ -46,6 +46,8 @@
#define PSCI_0_2_FN64_MIGRATE PSCI_0_2_FN64(5)
#define PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU PSCI_0_2_FN64(7)
#define PSCI_1_0_FN_PSCI_FEATURES PSCI_0_2_FN(10)
/* PSCI v0.2 power state encoding for CPU_SUSPEND function */
#define PSCI_0_2_POWER_STATE_ID_MASK 0xffff
#define PSCI_0_2_POWER_STATE_ID_SHIFT 0