From ef8deaffcbfb68c5b15cdc9c91607fce5734ec8b Mon Sep 17 00:00:00 2001 From: Vaibhav Shankar Date: Tue, 23 Aug 2016 17:56:17 -0700 Subject: soc/intel/apollolake: Add PM methods to power gate PCIe This implements GNVS variable to store the address of PERST_0, _ON/_OFF methods to power gate PCIe during S0ix entry, and PERST_0 assertion/de-assertion methods. BUG=chrome-os-partner:55877 TEST=Suspend and resume using 'echo freeze > /sys/power/state'. System should resume with PCIE and wifi functional. Change-Id: I9f63ca0b8a6565b6d21deaa6d3dfa34678714c19 Signed-off-by: Vaibhav Shankar Reviewed-on: https://review.coreboot.org/16351 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin Reviewed-by: Duncan Laurie Reviewed-by: Paul Menzel --- src/soc/intel/apollolake/acpi/pcie.asl | 126 +++++++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 src/soc/intel/apollolake/acpi/pcie.asl (limited to 'src/soc/intel/apollolake/acpi/pcie.asl') diff --git a/src/soc/intel/apollolake/acpi/pcie.asl b/src/soc/intel/apollolake/acpi/pcie.asl new file mode 100644 index 0000000000..050f2f0286 --- /dev/null +++ b/src/soc/intel/apollolake/acpi/pcie.asl @@ -0,0 +1,126 @@ +/* + * 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. + */ + +Device (RP01) +{ + Name (_ADR, 0x00140000) + Name (_DDN, "PCIe-B 0") + Name (PDST, 0) /* present Detect status */ + + /* lowest D-state supported by + * PCIe root port during S0 state + */ + Name (_S0W, 4) + + /* 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 }) +} -- cgit v1.2.3