cpu/intel/sandybridge: Use enum for ACPI C states

Also remove the now unnecessary comments from the devicetree.

Change-Id: Iebbe12fd413b7a2eb1078a579e194eba821ada7c
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69292
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/cpu/intel/model_206ax/chip.h

@@ -3,10 +3,21 @@
 /* Magic value used to locate this chip in the device tree */
 #define SPEEDSTEP_APIC_MAGIC 0xACAC
 
+/* Keep this in sync with acpi.c */
+enum cpu_acpi_level {
+	CPU_ACPI_DISABLED = 0,
+	CPU_ACPI_C1,
+	CPU_ACPI_C2,
+	CPU_ACPI_C3,
+	CPU_ACPI_C6,
+	CPU_ACPI_C7,
+	CPU_ACPI_C7S,
+};
+
 struct cpu_intel_model_206ax_config {
-	int acpi_c1;		/* ACPI C1 */
-	int acpi_c2;		/* ACPI C2 */
-	int acpi_c3;		/* ACPI C3 */
+	enum cpu_acpi_level acpi_c1;
+	enum cpu_acpi_level acpi_c2;
+	enum cpu_acpi_level acpi_c3;
 
 	int tcc_offset;		/* TCC Activation Offset */
 };

src/mainboard/intel/emeraldlake2/devicetree.cb

@@ -17,8 +17,8 @@ chip northbridge/intel/sandybridge
 			device lapic 0 on end
 			device lapic 0xacac off end
 
-			register "acpi_c1" = "3"	# ACPI(C1) = MWAIT(C3)
-			register "acpi_c2" = "4"	# ACPI(C2) = MWAIT(C6)
+			register "acpi_c1" = "CPU_ACPI_C3"
+			register "acpi_c2" = "CPU_ACPI_C6"
 		end
 	end
 

src/mainboard/kontron/ktqm77/devicetree.cb

@@ -8,8 +8,8 @@ chip northbridge/intel/sandybridge
 			device lapic 0 on end
 			device lapic 0xacac off end
 
-			register "acpi_c2" = "4"	# ACPI(C2) = MWAIT(C3)
-			register "acpi_c3" = "0"	# ACPI(C3) = MWAIT(C7)
+			register "acpi_c2" = "CPU_ACPI_C6"
+			register "acpi_c3" = "CPU_ACPI_DISABLED"
 		end
 	end
 

src/mainboard/roda/rv11/variants/rv11/devicetree.cb

@@ -23,8 +23,8 @@ chip northbridge/intel/sandybridge
 			device lapic 0 on end
 			device lapic 0xacac off end
 
-			register "acpi_c2" = "4"	# ACPI(C2) = MWAIT(C6)
-			register "acpi_c3" = "0"
+			register "acpi_c2" = "CPU_ACPI_C6"
+			register "acpi_c3" = "CPU_ACPI_DISABLED"
 		end
 	end
 

src/mainboard/roda/rv11/variants/rw11/devicetree.cb

@@ -23,8 +23,8 @@ chip northbridge/intel/sandybridge
 			device lapic 0 on end
 			device lapic 0xacac off end
 
-			register "acpi_c2" = "4"	# ACPI(C2) = MWAIT(C6)
-			register "acpi_c3" = "0"
+			register "acpi_c2" = "CPU_ACPI_C6"
+			register "acpi_c3" = "CPU_ACPI_DISABLED"
 		end
 	end
 

src/mainboard/samsung/stumpy/devicetree.cb

@@ -17,8 +17,8 @@ chip northbridge/intel/sandybridge
 			device lapic 0 on end
 			device lapic 0xacac off end
 
-			register "acpi_c1" = "3"	# ACPI(C1) = MWAIT(C3)
-			register "acpi_c2" = "4"	# ACPI(C2) = MWAIT(C6)
+			register "acpi_c1" = "CPU_ACPI_C3"
+			register "acpi_c2" = "CPU_ACPI_C6"
 		end
 	end
 

src/northbridge/intel/sandybridge/chipset.cb

@@ -8,9 +8,9 @@ chip northbridge/intel/sandybridge
 			device lapic 0 on end
 			device lapic 0xacac off end
 
-			register "acpi_c1" = "1"	# ACPI(C1) = MWAIT(C1)
-			register "acpi_c2" = "3"	# ACPI(C2) = MWAIT(C3)
-			register "acpi_c3" = "5"	# ACPI(C3) = MWAIT(C7)
+			register "acpi_c1" = "CPU_ACPI_C1"
+			register "acpi_c2" = "CPU_ACPI_C3"
+			register "acpi_c3" = "CPU_ACPI_C7"
 		end
 	end