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Commit 5f004e0c authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi
Browse files

drivers: firmware: psci: add PSCI_FEATURES call 



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: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: default avatarJisheng Zhang <jszhang@marvell.com>
Cc: Mark Rutland <mark.rutland@arm.com>
parent 068654c2

drivers/firmware/psci.c

+6 −0
Original line number Diff line number Diff line
@@ -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).

include/uapi/linux/psci.h

+2 −0
Original line number Diff line number Diff line
@@ -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