soc/intel/apollolake: Implement _PS0/_PS3 methods for PCIe root ports

Creates a common asl include file for PCIe power state methods. This
allows ports to be enabled independently.

BUG=None
BRANCH=None
TEST=None

Change-Id: I7b1cf4e14ebdfe9ecc7131dfe47c70ed7e2c3dc5
Signed-off-by: Venkateswarlu Vinjamuri <venkateswarlu.v.vinjamuri@intel.com>
Reviewed-on: https://review.coreboot.org/25532
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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 })