soc/intel/cannonlake: Move GPIO PM configuration to soc level

Enable GPIO clock gating when enter s0ix/Sx and save the PM bits.
Restore the PM bits when exit s0ix/Sx.

BUG=b:144002424
TEST=Check GPIO PM bits when enter/exit s0ix are expected

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I120f8369b8d3cf7ac821332bdfa124f6ed0570e9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37685
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/cannonlake/acpi/gpio.asl

@@ -157,3 +157,44 @@ Method (CGPM, 2, Serialized)
 		PCRO (Local0, GPIO_MISCCFG, And (Arg1, MISCCFG_ENABLE_GPIO_PM_CONFIG))
 	}
 }
+
+/* GPIO Power Management bits */
+Name(GPMB, Package(TOTAL_GPIO_COMM) {0})
+
+/*
+ * Save GPIO Power Management bits
+ */
+Method (SGPM, 0, Serialized)
+{
+	For (Local0 = 0, Local0 < TOTAL_GPIO_COMM, Local0++)
+	{
+		Local1 = GPID (Local0)
+		GPMB[Local0] = PCRR (Local1, GPIO_MISCCFG)
+	}
+}
+
+/*
+ * Restore GPIO Power Management bits
+ */
+Method (RGPM, 0, Serialized)
+{
+	For (Local0 = 0, Local0 < TOTAL_GPIO_COMM, Local0++)
+	{
+		CGPM (Local0, DerefOf(GPMB[Local0]))
+	}
+}
+
+/*
+ * Save current setting of GPIO Power Management bits and
+ * enable all Power Management bits for all communities
+ */
+Method (EGPM, 0, Serialized)
+{
+	/* Save current setting and will restore it when resuming */
+	SGPM ()
+	/* Enable PM bits */
+	For (Local0 = 0, Local0 < TOTAL_GPIO_COMM, Local0++)
+	{
+		CGPM (Local0, MISCCFG_ENABLE_GPIO_PM_CONFIG)
+	}
+}

src/soc/intel/cannonlake/acpi/lpit.asl

@@ -16,6 +16,8 @@
 
 External(\_SB.MS0X, MethodObj)
 External(\_SB.PCI0.LPCB.EC0.S0IX, MethodObj)
+External(\_SB.PCI0.EGPM, MethodObj)
+External(\_SB.PCI0.RGPM, MethodObj)
 
 scope(\_SB)
 {
@@ -73,6 +75,15 @@ scope(\_SB)
 				If (CondRefOf (\_SB.MS0X)) {
 					\_SB.MS0X(1)
 				}
+
+				/*
+				 * Save the current PM bits then
+				 * enable GPIO PM with MISCCFG_ENABLE_GPIO_PM_CONFIG
+ 				 */
+				If (CondRefOf (\_SB.PCI0.EGPM))
+				{
+					\_SB.PCI0.EGPM ()
+				}
 			}
 			/*
 			 * Function 6 - Low Power S0 Exit Notification
@@ -87,6 +98,12 @@ scope(\_SB)
 				If (CondRefOf (\_SB.MS0X)) {
 					\_SB.MS0X(0)
 				}
+
+				/* Restore GPIO all Community PM */
+				If (CondRefOf (\_SB.PCI0.RGPM))
+				{
+					\_SB.PCI0.RGPM ()
+				}
 			}
 		}
 		Return(Buffer(One) {0x00})

src/soc/intel/common/acpi/platform.asl

@@ -19,6 +19,8 @@
 
 External(\_SB.MPTS, MethodObj)
 External(\_SB.MWAK, MethodObj)
+External(\_SB.PCI0.EGPM, MethodObj)
+External(\_SB.PCI0.RGPM, MethodObj)
 
 /* Port 80 POST */
 
@@ -41,6 +43,14 @@ Method (_PTS, 1)
 	{
 		\_SB.MPTS (Arg0)
 	}
+	/*
+	 * Save the current PM bits then
+	 * enable GPIO PM with MISCCFG_ENABLE_GPIO_PM_CONFIG
+ 	 */
+	If (CondRefOf (\_SB.PCI0.EGPM))
+	{
+		\_SB.PCI0.EGPM ()
+	}
 }
 
 /* The _WAK method is called on system wakeup */
@@ -53,6 +63,11 @@ Method (_WAK, 1)
 	{
 		\_SB.MWAK (Arg0)
 	}
+	/* Restore GPIO all Community PM */
+	If (CondRefOf (\_SB.PCI0.RGPM))
+	{
+		\_SB.PCI0.RGPM ()
+	}
 
 	Return (Package(){0,0})
 }