diff options
author | Venkateswarlu Vinjamuri <venkateswarlu.v.vinjamuri@intel.com> | 2018-04-09 11:14:42 -0700 |
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committer | Patrick Georgi <pgeorgi@google.com> | 2018-04-17 10:44:47 +0000 |
commit | 79f1c3e2a5c28e7d6b308165428c15188419d1a3 (patch) | |
tree | c5213c7452f594e34a1fc74dce5795f01075d60a /src/soc | |
parent | f03c63ef956b53c691567e0bc3a4b61357155755 (diff) | |
download | coreboot-79f1c3e2a5c28e7d6b308165428c15188419d1a3.tar.xz |
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>
Diffstat (limited to 'src/soc')
-rw-r--r-- | src/soc/intel/apollolake/acpi/pcie_port.asl | 123 |
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 }) |