ACPI 6.0 introduced LPI(Low Power Idle) states that provides an alternate
method to describe processor idle states.
LPI extensions leverages the processor container device(again introduced
in ACPI 6.0) allowing to express which parts of the system are affected
by a given LPI state. It defines the local power states for each node
in a hierarchical processor topology. The OSPM can use _LPI object to
select a local power state for each level of processor hierarchy in the
system.
This patch adds LPI support on Juno.
Contributed-under: TianoCore Contribution Agreement 1.0
Cc: Ard Biesheuvel <ard.biesheu...@linaro.org>
Cc: Leif Lindholm <leif.lindh...@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.ho...@arm.com>
---
Platforms/ARM/Juno/AcpiTables/Dsdt.asl | 232 ++++++++++++++++++++++++++++++---
1 file changed, 213 insertions(+), 19 deletions(-)
diff --git a/Platforms/ARM/Juno/AcpiTables/Dsdt.asl
b/Platforms/ARM/Juno/AcpiTables/Dsdt.asl
index c80f46a4ce64..3247e6b12aa5 100644
--- a/Platforms/ARM/Juno/AcpiTables/Dsdt.asl
+++ b/Platforms/ARM/Juno/AcpiTables/Dsdt.asl
@@ -19,29 +19,223 @@ DefinitionBlock("DsdtTable.aml", "DSDT", 1, "ARMLTD",
"ARM-JUNO", EFI_ACPI_ARM_O
//
// A57x2-A53x4 Processor declaration
//
- Device(CPU0) { // A53-0: Cluster 1, Cpu 0
- Name(_HID, "ACPI0007")
- Name(_UID, 0)
+ Method (_OSC, 4, Serialized) { // _OSC: Operating System Capabilities
+ CreateDWordField (Arg3, 0x00, STS0)
+ CreateDWordField (Arg3, 0x04, CAP0)
+ If ((Arg0 == ToUUID ("0811b06e-4a27-44f9-8d60-3cbbc22e7b48") /*
Platform-wide Capabilities */)) {
+ If (!(Arg1 == One)) {
+ STS0 &= ~0x1F
+ STS0 |= 0x0A
+ } Else {
+ If ((CAP0 & 0x100)) {
+ CAP0 &= ~0x100 /* No support for OS Initiated LPI */
+ STS0 &= ~0x1F
+ STS0 |= 0x12
+ }
+ }
+ } Else {
+ STS0 &= ~0x1F
+ STS0 |= 0x06
+ }
+ Return (Arg3)
}
- Device(CPU1) { // A53-1: Cluster 1, Cpu 1
- Name(_HID, "ACPI0007")
+ Device (CLU0) { // Cluster0 state
+ Name(_HID, "ACPI0010")
Name(_UID, 1)
+ Name (_LPI, Package() {
+ 0, // Version
+ 0, // Level Index
+ 1, // Count
+ Package() { // Power Gating state for Cluster
+ 2500, // Min residency (uS)
+ 1150, // Wake latency (uS)
+ 1, // Flags
+ 1, // Arch Context Flags
+ 100, //Residency Counter Frequency
+ 0, // No Parent State
+ 0x01000000, // Integer Entry method
+ ResourceTemplate() { // Null Residency Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ ResourceTemplate() { // Null Usage Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ "CluPwrDn"
+ },
+ })
+ Name(PLPI, Package() {
+ 0, // Version
+ 1, // Level Index
+ 2, // Count
+ Package() { // WFI for CPU
+ 1, // Min residency (uS)
+ 1, // Wake latency (uS)
+ 1, // Flags
+ 0, // Arch Context Flags
+ 100, //Residency Counter Frequency
+ 0, // No parent state
+ ResourceTemplate () {
+ // Register Entry method
+ Register (FFixedHW,
+ 0x20, // Bit Width
+ 0x00, // Bit Offset
+ 0xFFFFFFFF, // Address
+ 0x03, // Access Size
+ )
+ },
+ ResourceTemplate() { // Null Residency Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ ResourceTemplate() { // Null Usage Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ "WFI",
+ },
+ Package() { // Power Gating state for CPU
+ 150, // Min residency (uS)
+ 350, // Wake latency (uS)
+ 1, // Flags
+ 1, // Arch Context Flags
+ 100, //Residency Counter Frequency
+ 1, // Parent node can be in any state
+ ResourceTemplate () {
+ // Register Entry method
+ Register (FFixedHW,
+ 0x20, // Bit Width
+ 0x00, // Bit Offset
+ 0x00010000, // Address
+ 0x03, // Access Size
+ )
+ },
+ ResourceTemplate() { // Null Residency Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ ResourceTemplate() { // Null Usage Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ "CorePwrDn"
+ },
+ })
+ Device(CPU0) { // A57-0: Cluster 0, Cpu 0
+ Name(_HID, "ACPI0007")
+ Name(_UID, 4)
+ Method (_LPI, 0, NotSerialized) {
+ return(PLPI)
+ }
+ }
+ Device(CPU1) { // A57-1: Cluster 0, Cpu 1
+ Name(_HID, "ACPI0007")
+ Name(_UID, 5)
+ Method (_LPI, 0, NotSerialized) {
+ return(PLPI)
+ }
+ }
}
- Device(CPU2) { // A53-2: Cluster 1, Cpu 2
- Name(_HID, "ACPI0007")
+ Device (CLU1) { // Cluster1 state
+ Name(_HID, "ACPI0010")
Name(_UID, 2)
- }
- Device(CPU3) { // A53-3: Cluster 1, Cpu 3
- Name(_HID, "ACPI0007")
- Name(_UID, 3)
- }
- Device(CPU4) { // A57-0: Cluster 0, Cpu 0
- Name(_HID, "ACPI0007")
- Name(_UID, 4)
- }
- Device(CPU5) { // A57-1: Cluster 0, Cpu 1
- Name(_HID, "ACPI0007")
- Name(_UID, 5)
+ Name (_LPI, Package() {
+ 0, // Version
+ 0, // Level Index
+ 1, // Count
+ Package() { // Power Gating state for Cluster
+ 2500, // Min residency (uS)
+ 1150, // Wake latency (uS)
+ 1, // Flags
+ 1, // Arch Context Flags
+ 100, //Residency Counter Frequency
+ 0, // No Parent State
+ 0x01000000, // Integer Entry method
+ ResourceTemplate() { // Null Residency Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ ResourceTemplate() { // Null Usage Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ "CluPwrDn"
+ },
+ })
+ Name(PLPI, Package() {
+ 0, // Version
+ 1, // Level Index
+ 2, // Count
+ Package() { // WFI for CPU
+ 1, // Min residency (uS)
+ 1, // Wake latency (uS)
+ 1, // Flags
+ 0, // Arch Context Flags
+ 100, //Residency Counter Frequency
+ 0, // No parent state
+ ResourceTemplate () {
+ // Register Entry method
+ Register (FFixedHW,
+ 0x20, // Bit Width
+ 0x00, // Bit Offset
+ 0xFFFFFFFF, // Address
+ 0x03, // Access Size
+ )
+ },
+ ResourceTemplate() { // Null Residency Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ ResourceTemplate() { // Null Usage Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ "WFI",
+ },
+ Package() { // Power Gating state for CPU
+ 150, // Min residency (uS)
+ 350, // Wake latency (uS)
+ 1, // Flags
+ 1, // Arch Context Flags
+ 100, //Residency Counter Frequency
+ 1, // Parent node can be in any state
+ ResourceTemplate () {
+ // Register Entry method
+ Register (FFixedHW,
+ 0x20, // Bit Width
+ 0x00, // Bit Offset
+ 0x00010000, // Address
+ 0x03, // Access Size
+ )
+ },
+ ResourceTemplate() { // Null Residency Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ ResourceTemplate() { // Null Usage Counter
+ Register (SystemMemory, 0, 0, 0, 0)
+ },
+ "CorePwrDn"
+ },
+ })
+ Device(CPU2) { // A53-0: Cluster 1, Cpu 0
+ Name(_HID, "ACPI0007")
+ Name(_UID, 0)
+ Method (_LPI, 0, NotSerialized) {
+ return(PLPI)
+ }
+ }
+ Device(CPU3) { // A53-1: Cluster 1, Cpu 1
+ Name(_HID, "ACPI0007")
+ Name(_UID, 1)
+ Method (_LPI, 0, NotSerialized) {
+ return(PLPI)
+ }
+ }
+ Device(CPU4) { // A53-2: Cluster 1, Cpu 2
+ Name(_HID, "ACPI0007")
+ Name(_UID, 2)
+ Method (_LPI, 0, NotSerialized) {
+ return(PLPI)
+ }
+ }
+ Device(CPU5) { // A53-3: Cluster 1, Cpu 3
+ Name(_HID, "ACPI0007")
+ Name(_UID, 3)
+ Method (_LPI, 0, NotSerialized) {
+ return(PLPI)
+ }
+ }
}
//
--
1.9.1
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