From: lorenzo.pieralisi@arm.com (Lorenzo Pieralisi)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 3/5] drivers: firmware: psci: add PSCI_FEATURES call
Date: Wed, 8 Jul 2015 18:16:49 +0100 [thread overview]
Message-ID: <1436375811-10529-4-git-send-email-lorenzo.pieralisi@arm.com> (raw)
In-Reply-To: <1436375811-10529-1-git-send-email-lorenzo.pieralisi@arm.com>
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>
Cc: Mark Rutland <mark.rutland@arm.com>
---
drivers/firmware/psci.c | 6 ++++++
include/uapi/linux/psci.h | 2 ++
2 files changed, 8 insertions(+)
diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index 6bd013d..24ef3a8 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -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).
diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h
index 64469e6..187b828d 100644
--- a/include/uapi/linux/psci.h
+++ b/include/uapi/linux/psci.h
@@ -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
--
2.2.1
next prev parent reply other threads:[~2015-07-08 17:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 17:16 [PATCH v2 0/5] drivers: firmware: psci: add basic v1.0 support Lorenzo Pieralisi
2015-07-08 17:16 ` [PATCH v2 1/5] drivers: firmware: psci: add INVALID_ADDRESS return value Lorenzo Pieralisi
2015-07-08 17:16 ` [PATCH v2 2/5] drivers: firmware: psci: move power_state handling to generic code Lorenzo Pieralisi
2015-07-09 13:39 ` Catalin Marinas
2015-07-08 17:16 ` Lorenzo Pieralisi [this message]
2015-07-08 17:16 ` [PATCH v2 4/5] drivers: firmware: psci: add extended stateid power_state support Lorenzo Pieralisi
2015-10-22 22:07 ` Kevin Hilman
2015-10-23 10:23 ` Arnd Bergmann
2015-10-23 10:44 ` Lorenzo Pieralisi
2015-10-23 10:55 ` Arnd Bergmann
2015-10-23 11:36 ` Lorenzo Pieralisi
2015-10-23 15:10 ` Kevin Hilman
2015-10-26 10:05 ` Lorenzo Pieralisi
2015-07-08 17:16 ` [PATCH v2 5/5] drivers: firmware: psci: add PSCI v1.0 DT bindings Lorenzo Pieralisi
2015-10-05 11:48 ` Andre Przywara
2015-10-05 12:06 ` Mark Rutland
2015-10-05 12:11 ` Lorenzo Pieralisi
2015-09-14 13:35 ` [PATCH v2 0/5] drivers: firmware: psci: add basic v1.0 support Lorenzo Pieralisi
2015-09-15 3:23 ` Jisheng Zhang
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