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-rw-r--r--src/soc/intel/apollolake/acpi/scs.asl67
-rw-r--r--src/soc/intel/apollolake/acpi/southbridge.asl3
2 files changed, 70 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/acpi/scs.asl b/src/soc/intel/apollolake/acpi/scs.asl
new file mode 100644
index 0000000000..4108017fe6
--- /dev/null
+++ b/src/soc/intel/apollolake/acpi/scs.asl
@@ -0,0 +1,67 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Corporation.
+ *
+ * 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.
+ */
+
+Scope (\_SB.PCI0) {
+ /* 0xD6- is the port address */
+ /* 0x600- is the dynamic clock gating control register offset (GENR) */
+ OperationRegion (SBMM, SystemMemory,
+ Or ( Or (CONFIG_IOSF_BASE_ADDRESS,
+ ShiftLeft(0xD6, 16)), 0x0600), 0x18)
+ Field (SBMM, DWordAcc, NoLock, Preserve)
+ {
+ GENR, 32,
+ }
+
+ /* SCC power gate control method, this method must be serialized as
+ * multiple device will control the GENR register
+ *
+ * Arguments: (2)
+ * Arg0: 0-AND 1-OR
+ * Arg1: Value
+ */
+ Method (SCPG, 2, Serialized)
+ {
+ if (LEqual(Arg0, 0x1)) {
+ Or (^GENR, Arg1, ^GENR)
+ } ElseIf (LEqual(Arg0, 0x0)){
+ And (^GENR, Arg1, ^GENR)
+ }
+ }
+
+ /* eMMC */
+ Device (SDHA) {
+ Name (_ADR, 0x001C0000)
+ Name (_DDN, "Intel(R) eMMC Controller - 80865ACC")
+
+ Method (_PS0, 0, NotSerialized)
+ {
+ /* Clear clock gate
+ * Clear bit 6 and 0
+ */
+ ^^SCPG(0,0xFFFFFFBE)
+ /* Sleep 2 ms */
+ Sleep (2)
+ }
+
+ Method (_PS3, 0, NotSerialized)
+ {
+ /* Enable power gate
+ * Restore clock gate
+ * Restore bit 6 and 0
+ */
+ ^^SCPG(1,0x00000041)
+ }
+ } /* Device (SDHA) */
+}
diff --git a/src/soc/intel/apollolake/acpi/southbridge.asl b/src/soc/intel/apollolake/acpi/southbridge.asl
index 5b29abb557..391a531e4f 100644
--- a/src/soc/intel/apollolake/acpi/southbridge.asl
+++ b/src/soc/intel/apollolake/acpi/southbridge.asl
@@ -31,5 +31,8 @@
/* LPC */
#include "lpc.asl"
+/* eMMC */
+#include "scs.asl"
+
/* PCI _OSC */
#include <soc/intel/common/acpi/pci_osc.asl>