[edk2-devel] [edk2-platforms][PATCH v3 7/8] Platform/Sgi: Low Power Idle States for RD-Fremont

["Prabin CA" <prabin.ca@arm.com>]

RD-Fremont platform supports two LPI states, LPI1 (Standby WFI) and LPI3
(Power-down). The cluster supports LPI2 (Power-down) state. The LPI
implementation also supports combined power state for core and cluster.

Signed-off-by: Prabin CA <prabin.ca@arm.com>
---
 Platform/ARM/SgiPkg/AcpiTables/RdFremontAcpiTables.inf |   1 +
 Platform/ARM/SgiPkg/AcpiTables/RdFremont/Dsdt.asl      | 154 ++++++++++++++++++++
 2 files changed, 155 insertions(+)

diff --git a/Platform/ARM/SgiPkg/AcpiTables/RdFremontAcpiTables.inf b/Platform/ARM/SgiPkg/AcpiTables/RdFremontAcpiTables.inf
index 9d07001dec96..7556c1239116 100644
--- a/Platform/ARM/SgiPkg/AcpiTables/RdFremontAcpiTables.inf
+++ b/Platform/ARM/SgiPkg/AcpiTables/RdFremontAcpiTables.inf
@@ -48,6 +48,7 @@ [FixedPcd]
   gArmSgiTokenSpaceGuid.PcdGpioController0Interrupt
   gArmSgiTokenSpaceGuid.PcdGtFrame0Gsiv
   gArmSgiTokenSpaceGuid.PcdGtFrame1Gsiv
+  gArmSgiTokenSpaceGuid.PcdOscLpiEnable
   gArmSgiTokenSpaceGuid.PcdSp804DualTimerBaseAddress
   gArmSgiTokenSpaceGuid.PcdSp804DualTimerSize
   gArmSgiTokenSpaceGuid.PcdSp804DualTimerInterrupt
diff --git a/Platform/ARM/SgiPkg/AcpiTables/RdFremont/Dsdt.asl b/Platform/ARM/SgiPkg/AcpiTables/RdFremont/Dsdt.asl
index 8812ea877f7a..f921eeb2d99e 100644
--- a/Platform/ARM/SgiPkg/AcpiTables/RdFremont/Dsdt.asl
+++ b/Platform/ARM/SgiPkg/AcpiTables/RdFremont/Dsdt.asl
@@ -8,6 +8,9 @@
 * @par Specification Reference:
 *   - ACPI 6.5, Chapter 5, Section 5.2.11.1, Differentiated System Description
 *     Table (DSDT)
+*   - ACPI 6.5, Chapter 8, Section 8.4.3, Lower Power Idle States
+*   - Arm Functional Fixed Hardware Specification v1.2, Chapter 3, Section 3.1,
+*     Idle management and Low Power Idle states
 *
 **/
 
@@ -17,6 +20,93 @@
 DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
                  EFI_ACPI_ARM_OEM_REVISION) {
   Scope (_SB) {
+    /* _OSC: Operating System Capabilities */
+    Method (_OSC, 4, Serialized) {
+      CreateDWordField (Arg3, 0x00, STS0)
+      CreateDWordField (Arg3, 0x04, CAP0)
+
+      /* Platform-wide Capabilities */
+      If (LEqual (Arg0, ToUUID("0811b06e-4a27-44f9-8d60-3cbbc22e7b48"))) {
+        /* OSC rev 1 supported, for other version, return failure */
+        If (LEqual (Arg1, One)) {
+          And (STS0, Not (OSC_STS_MASK), STS0)
+
+          If (And (CAP0, OSC_CAP_OS_INITIATED_LPI)) {
+            /* OS initiated LPI not supported */
+            And (CAP0, Not (OSC_CAP_OS_INITIATED_LPI), CAP0)
+            Or (STS0, OSC_STS_CAPABILITY_MASKED, STS0)
+          }
+
+          If (And (CAP0, OSC_CAP_PLAT_COORDINATED_LPI)) {
+            if (LEqual (FixedPcdGet32 (PcdOscLpiEnable), Zero)) {
+              And (CAP0, Not (OSC_CAP_PLAT_COORDINATED_LPI), CAP0)
+              Or (STS0, OSC_STS_CAPABILITY_MASKED, STS0)
+            }
+          }
+        } Else {
+          And (STS0, Not (OSC_STS_MASK), STS0)
+          Or (STS0, Or (OSC_STS_FAILURE, OSC_STS_UNRECOGNIZED_REV), STS0)
+        }
+      } Else {
+        And (STS0, Not (OSC_STS_MASK), STS0)
+        Or (STS0, Or (OSC_STS_FAILURE, OSC_STS_UNRECOGNIZED_UUID), STS0)
+      }
+
+      Return (Arg3)
+    }
+
+    Name (PLPI, Package () {  /* LPI for Processor, support 2 LPI states */
+      0,                      // Version
+      0,                      // Level Index
+      2,                      // Count
+      Package () {            // WFI for CPU
+        1,                    // Min residency (uS)
+        1,                    // Wake latency (uS)
+        1,                    // Flags
+        0,                    // Arch Context lost Flags (no loss)
+        0,                    // Residency Counter Frequency
+        0,                    // No parent state
+        ResourceTemplate () { // Register Entry method
+          Register (FFixedHW,
+            32,               // Bit Width
+            0,                // Bit Offset
+            0xFFFFFFFF,       // Address
+            3,                // Access Size
+          )
+        },
+        ResourceTemplate () { // Null Residency Counter
+          Register (SystemMemory, 0, 0, 0, 0)
+        },
+        ResourceTemplate () { // Null Usage Counter
+          Register (SystemMemory, 0, 0, 0, 0)
+        },
+        "LPI1-Core"
+      },
+      Package () {            // Power Gating state for CPU
+        150,                  // Min residency (uS)
+        350,                  // Wake latency (uS)
+        1,                    // Flags
+        1,                    // Arch Context lost Flags (Core context lost)
+        0,                    // Residency Counter Frequency
+        0,                    // No parent state
+        ResourceTemplate () { // Register Entry method
+          Register (FFixedHW,
+            32,               // Bit Width
+            0,                // Bit Offset
+            0x40000002,       // Address (PwrLvl:core, StateTyp:PwrDn)
+            3,                // Access Size
+          )
+        },
+        ResourceTemplate () { // Null Residency Counter
+          Register (SystemMemory, 0, 0, 0, 0)
+        },
+        ResourceTemplate () { // Null Usage Counter
+          Register (SystemMemory, 0, 0, 0, 0)
+        },
+        "LPI3-Core"
+      },
+    })
+
     Device (CL00) {   // Cluster 0
       Name (_HID, "ACPI0010")
       Name (_UID, 0)
@@ -25,6 +115,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 0)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -36,6 +130,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 1)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -47,6 +145,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 2)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -58,6 +160,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 3)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -69,6 +175,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 4)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -80,6 +190,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 5)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -91,6 +205,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 6)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -102,6 +220,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 7)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -113,6 +235,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 8)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -124,6 +250,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 9)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -135,6 +265,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 10)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -146,6 +280,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 11)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -157,6 +295,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 12)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -168,6 +310,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 13)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -179,6 +325,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 14)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
 
@@ -190,6 +340,10 @@ DefinitionBlock ("DsdtTable.aml", "DSDT", 2, "ARMLTD", "ARMSGI",
         Name (_HID, "ACPI0007")
         Name (_UID, 15)
         Name (_STA, 0xF)
+
+        Method (_LPI, 0, NotSerialized) {
+          Return (\_SB.PLPI)
+        }
       }
     }
   } // Scope(_SB)
-- 
2.34.1



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