soc/amd/stoneyridge/acpi: Create a GPIO library

There are some acpigen functionality that have not been implemented. In
order to implement them, ACPI GPIO functions to read and write to the
control MMIO of a particular pin is needed. So as a preliminary task to
implementing acpigen functions, create a library with functions to be
accessed by acpigen generated ACPI code.

BUG=b:79546790
TEST=Build grunt, more tests with commit 0f2acbd6b1.

Change-Id: I21c014b7f2698dd9193dae3113b18ee2a7303bcf
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/26334
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

3 files changed, 136 insertions, 0 deletions

diff --git a/src/soc/amd/stoneyridge/acpi/gpio_lib.asl b/src/soc/amd/stoneyridge/acpi/gpio_lib.asl
new file mode 100644
index 0000000000..fbd6525f53
--- /dev/null
+++ b/src/soc/amd/stoneyridge/acpi/gpio_lib.asl
@@ -0,0 +1,132 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <soc/iomap.h>
+
+/* Get pin control MMIO address */
+Method (GPAD, 0x1)
+{
+	/* Arg0 - GPIO pin number */
+	Return (Add(Multiply(Arg0, 4), GPIO_CONTROL_BASE))
+}
+
+/* Read pin control dword */
+Method (GPRD, 0x1, Serialized)
+{
+	/* Arg0 - GPIO pin control MMIO address */
+	Store (Arg0, Local0)
+	OperationRegion (GPDW, SystemMemory, Local0, 4)
+	Field (GPDW, AnyAcc, NoLock, Preserve) {
+		TEMP, 32
+	}
+	Return (TEMP)
+}
+
+/* Write pin control dword */
+Method (GPWR, 0x2, Serialized)
+{
+	/* Arg0 - GPIO pin control MMIO address */
+	/* Arg1 - Value for control register */
+	Store (Arg0, Local0)
+	OperationRegion (GPDW, SystemMemory, Local0, 4)
+	Field (GPDW, AnyAcc, NoLock, Preserve) {
+		TEMP,32
+	}
+	Store (Arg1, TEMP)
+}
+
+Method (GPGB, 0x2)
+{
+	/*
+	 * Returns the desired byte
+	 * Arg0 - GPIO pin control MMIO address
+	 * Arg1 - Desired byte (0 through 3)
+	 */
+	Store (Multiply(Arg1, 8), Local2)
+	Return (And(ShiftRight(GPRD(Arg0), Local2), 0x000000FF))
+}
+
+Method (GPSB, 0x3)
+{
+	/*
+	 * Reads dword, replace byte, write back dword
+	 * Arg0 - GPIO pin control MMIO address
+	 * Arg1 - Desired byte (0 through 3)
+	 * Arg2 - Value
+	 */
+	Store (Multiply(Arg1, 8), Local2)
+	And(ShiftRight(GPRD(Arg0), Local2), 0xFFFFFF00, Local3)
+	ShiftLeft (Or(And(Arg2, 0x000000FF),Local3), Local2, Local4)
+	GPWR (Arg0, Local4)
+}
+
+/* Read pin control byte 0 */
+Method (GPR0, 0x1)
+{
+	/* Arg0 - GPIO pin control MMIO address */
+	Return (GPGB(Arg0, 0))
+}
+
+/* Read pin control byte 1 */
+Method (GPR1, 0x1)
+{
+	/* Arg0 - GPIO pin control MMIO address */
+	Return (GPGB(Arg0, 1))
+}
+
+/* Read pin control byte 2 */
+Method (GPR2, 0x1)
+{
+	/* Arg0 - GPIO pin control MMIO address */
+	Return (GPGB(Arg0, 2))
+}
+
+/* Read pin control byte 3 */
+Method (GPR3, 0x1)
+{
+	Return (GPGB(Arg0, 3))
+}
+
+/* Write pin control byte 0 */
+Method (GPW0, 0x2)
+{
+	/* Arg0 - GPIO pin control MMIO address */
+	/* Arg1 - Value for control register */
+	GPSB (Arg0, 0, Arg1)
+}
+
+/* Write pin control byte 1 */
+Method (GPW1, 0x2)
+{
+	/* Arg0 - GPIO pin control MMIO address */
+	/* Arg1 - Value for control register */
+	GPSB (Arg0, 1, Arg1)
+}
+
+/* Write pin control byte 2 */
+Method (GPW2, 0x2)
+{
+	/* Arg0 - GPIO pin control MMIO address */
+	/* Arg1 - Value for control register */
+	GPSB (Arg0, 2, Arg1)
+}
+
+/* Write pin control byte 3 */
+Method (GPW3, 0x2)
+{
+	/* Arg0 - GPIO pin control MMIO address */
+	/* Arg1 - Value for control register */
+	GPSB (Arg0, 3, Arg1)
+}
diff --git a/src/soc/amd/stoneyridge/acpi/soc.asl b/src/soc/amd/stoneyridge/acpi/soc.asl
index d7772948ef..6fd838a56d 100644
--- a/src/soc/amd/stoneyridge/acpi/soc.asl
+++ b/src/soc/amd/stoneyridge/acpi/soc.asl
@@ -26,3 +26,6 @@ Device(PCI0) {
 
 /* Describe the devices in the Southbridge */
 #include "sb_fch.asl"
+
+/* Add GPIO library */
+#include <gpio_lib.asl>
diff --git a/src/soc/amd/stoneyridge/include/soc/iomap.h b/src/soc/amd/stoneyridge/include/soc/iomap.h
index 01171c3cf8..341d97d687 100644
--- a/src/soc/amd/stoneyridge/include/soc/iomap.h
+++ b/src/soc/amd/stoneyridge/include/soc/iomap.h
@@ -39,6 +39,7 @@
 #define BIOSRAM_MMIO_BASE		0xfed80500
 #define IOMUX_MMIO_BASE			0xfed80d00
 #define MISC_MMIO_BASE			0xfed80e00
+#define GPIO_CONTROL_BASE		0xfed81500
 #define XHCI_ACPI_PM_MMIO_BASE		0xfed81c00
 #define AOAC_MMIO_BASE			0xfed81e00