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-rw-r--r--src/soc/intel/apollolake/acpi/pcie_port.asl123
1 files changed, 123 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/acpi/pcie_port.asl b/src/soc/intel/apollolake/acpi/pcie_port.asl
new file mode 100644
index 0000000000..d06336cb06
--- /dev/null
+++ b/src/soc/intel/apollolake/acpi/pcie_port.asl
@@ -0,0 +1,123 @@
+/*
+ * 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.
+ */
+
+/* Include in each PCIe Root Port device */
+
+/* lowest D-state supported by
+ * PCIe root port during S0 state
+ */
+Name (_S0W, 4)
+
+Name (PDST, 0) /* present Detect status */
+
+/* Dynamic Opregion needed to access registers
+ * when the controller is in D3 cold
+ */
+OperationRegion (PX01, PCI_Config, 0x00, 0xFF)
+Field (PX01, AnyAcc, NoLock, Preserve)
+{
+ Offset(0x5A),
+ , 6,
+ PDS, 1, /* 6, Presence detect Change */
+ Offset(0xE2), /* RPPGEN - Root Port Power Gating Enable */
+ , 2,
+ L23E, 1, /* 2, L23_Rdy Entry Request (L23ER) */
+ L23R, 1, /* 3, L23_Rdy to Detect Transition (L23R2DT) */
+ Offset(0xF4), /* BLKPLLEN */
+ , 10,
+ BPLL, 1,
+}
+
+OperationRegion (PX02, PCI_Config, 0x338, 0x4)
+Field (PX02, AnyAcc, NoLock, Preserve)
+{
+ , 26,
+ BDQA, 1 /* BLKDQDA */
+}
+
+PowerResource (PXP, 0, 0)
+{
+ /* Define the PowerResource for PCIe slot */
+ Method (_STA, 0, Serialized)
+ {
+ Store (PDS, PDST)
+ If (LEqual (PDS, 1)) {
+ Return (0xf)
+ } Else {
+ Return (0)
+ }
+ }
+
+ Method (_ON, 0, Serialized)
+ {
+ If (LAnd (LEqual (PDST, 1), LNotEqual (\PRT0, 0))) {
+ /* Enter this condition if device
+ * is connected
+ */
+
+ /* De-assert PERST */
+ \_SB.PCI0.PRDA (\PRT0)
+
+ Store (0, BDQA) /* Set BLKDQDA to 0 */
+ Store (0, BPLL) /* Set BLKPLLEN to 0 */
+
+ /* Set L23_Rdy to Detect Transition
+ * (L23R2DT)
+ */
+ Store (1, L23R)
+ Sleep (16)
+ Store (0, Local0)
+
+ /* Delay for transition Detect
+ * and link to train
+ */
+ While (L23R) {
+ If (Lgreater (Local0, 4)) {
+ Break
+ }
+ Sleep (16)
+ Increment (Local0)
+ }
+ } /* End PDS condition check */
+ }
+
+ Method (_OFF, 0, Serialized)
+ {
+ /* Set L23_Rdy Entry Request (L23ER) */
+ If (LAnd (LEqual (PDST, 1), LNotEqual (\PRT0, 0))) {
+ /* enter this condition if device
+ * is connected
+ */
+ Store (1, L23E)
+ Sleep (16)
+ Store (0, Local0)
+ While (L23E) {
+ If (Lgreater (Local0, 4)) {
+ Break
+ }
+ Sleep (16)
+ Increment (Local0)
+ }
+ Store (1, BDQA) /* Set BLKDQDA to 1 */
+ Store (1, BPLL) /* Set BLKPLLEN to 1 */
+
+ /* Assert PERST */
+ \_SB.PCI0.PRAS (\PRT0)
+ } /* End PDS condition check */
+ } /* End of Method_OFF */
+} /* End PXP */
+
+Name(_PR0, Package() { PXP })
+Name(_PR3, Package() { PXP })