[coreboot-gerrit] Change in ...coreboot[master]: soc/intel/cannonlake: Add ASL functions to manipulate RX/TX buffers

[Rizwan Qureshi (Code Review)]

Rizwan Qureshi has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/31619

Change subject: soc/intel/cannonlake: Add ASL functions to manipulate RX/TX buffers
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soc/intel/cannonlake: Add ASL functions to manipulate RX/TX buffers

Add a function in gpio ASL library to enable/disable pad Rx/Tx Buffers.

BUG=b:123350329

Change-Id: I6c40d79debb61b0c4e96e485b410d446b77d9cf6
Signed-off-by: Rizwan Qureshi 
---
M src/soc/intel/cannonlake/acpi/gpio_op.asl
M src/soc/intel/cannonlake/include/soc/gpio_defs.h
2 files changed, 46 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/19/31619/1

diff --git a/src/soc/intel/cannonlake/acpi/gpio_op.asl b/src/soc/intel/cannonlake/acpi/gpio_op.asl
index 0c89e99..e1cfe04 100644
--- a/src/soc/intel/cannonlake/acpi/gpio_op.asl
+++ b/src/soc/intel/cannonlake/acpi/gpio_op.asl
@@ -94,3 +94,45 @@
    And (ShiftLeft (Arg1, GPIOPADMODE_SHIFT, Arg1), GPIOPADMODE_MASK, Arg1)
    Or (Local0, Arg1, VAL0)
 }
+
+/*
+ * Enable/Disable Tx buffer
+ * Arg0 - GPIO Number
+ * Arg1 - TxBuffer state
+ *     0 = Disable Tx Buffer
+ *     1 = Enable Tx Buffer
+ */
+Method (GTXE, 2, Serialized)
+{
+	OperationRegion (PREG, SystemMemory, GADD (Arg0), 4)
+	Field (PREG, AnyAcc, NoLock, Preserve)
+	{
+		VAL0, 32
+	}
+	Arg1 = LNot (Arg1)
+	Store (VAL0, Local0)
+	And (Not (GPIOTXBUFDIS_MASK), Local0, Local0)
+	And (ShiftLeft (Arg1, GPIOTXBUFDIS_SHIFT, Arg1), GPIOTXBUFDIS_MASK, Arg1)
+	Or (Local0, Arg1, VAL0)
+}
+
+/*
+ * Enable/Disable Rx buffer
+ * Arg0 - GPIO Number
+ * Arg1 - RxBuffer state
+ *     0 = Disable Rx Buffer
+ *     1 = Enable Rx Buffer
+ */
+Method (GRXE, 2, Serialized)
+{
+	OperationRegion (PREG, SystemMemory, GADD (Arg0), 4)
+	Field (PREG, AnyAcc, NoLock, Preserve)
+	{
+		VAL0, 32
+	}
+	Arg1 = LNot (Arg1)
+	Store (VAL0, Local0)
+	And (Not (GPIORXBUFDIS_MASK), Local0, Local0)
+	And (ShiftLeft (Arg1, GPIORXBUFDIS_SHIFT, Arg1), GPIORXBUFDIS_MASK, Arg1)
+	Or (Local0, Arg1, VAL0)
+}
diff --git a/src/soc/intel/cannonlake/include/soc/gpio_defs.h b/src/soc/intel/cannonlake/include/soc/gpio_defs.h
index e8b4f61..3399526 100644
--- a/src/soc/intel/cannonlake/include/soc/gpio_defs.h
+++ b/src/soc/intel/cannonlake/include/soc/gpio_defs.h
@@ -255,4 +255,8 @@
 #define GPIOTXSTATE_MASK			0x1
 #define GPIOPADMODE_MASK			0xC00
 #define GPIOPADMODE_SHIFT			10
+#define GPIOTXBUFDIS_MASK			0x100
+#define GPIOTXBUFDIS_SHIFT			8
+#define GPIORXBUFDIS_MASK			0x200
+#define GPIORXBUFDIS_SHIFT			9
 #endif