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drivers: firmware: psci: add extended stateid power_state support

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PSCI v1.0 augmented the power_state parameter format specification
(extended stateid) and introduced a way to probe it through the
PSCI_FEATURES interface.

This patch implements code that detects the power_state format at
run-time through the PSCI_FEATURES interface, so that the power_state
argument can be properly detected and validated in the kernel according
to the information provided through firmware.

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 17:10:32 +01:00
parent 5f004e0c9f
commit a5c00bb28d
2 changed files with 44 additions and 2 deletions
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12
include/uapi/linux/psci.h
View file

@ -58,6 +58,13 @@
#define PSCI_0_2_POWER_STATE_AFFL_MASK \
(0x3 << PSCI_0_2_POWER_STATE_AFFL_SHIFT)
/* PSCI extended power state encoding for CPU_SUSPEND function */
#define PSCI_1_0_EXT_POWER_STATE_ID_MASK 0xfffffff
#define PSCI_1_0_EXT_POWER_STATE_ID_SHIFT 0
#define PSCI_1_0_EXT_POWER_STATE_TYPE_SHIFT 30
#define PSCI_1_0_EXT_POWER_STATE_TYPE_MASK \
(0x1 << PSCI_1_0_EXT_POWER_STATE_TYPE_SHIFT)
/* PSCI v0.2 affinity level state returned by AFFINITY_INFO */
#define PSCI_0_2_AFFINITY_LEVEL_ON 0
#define PSCI_0_2_AFFINITY_LEVEL_OFF 1
@ -78,6 +85,11 @@
#define PSCI_VERSION_MINOR(ver) \
((ver) & PSCI_VERSION_MINOR_MASK)
/* PSCI features decoding (>=1.0) */
#define PSCI_1_0_FEATURES_CPU_SUSPEND_PF_SHIFT 1
#define PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK \
(0x1 << PSCI_1_0_FEATURES_CPU_SUSPEND_PF_SHIFT)
/* PSCI return values (inclusive of all PSCI versions) */
#define PSCI_RET_SUCCESS 0
#define PSCI_RET_NOT_SUPPORTED -1