81 lines
2.3 KiB
Text
81 lines
2.3 KiB
Text
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2011 Christoph Grenz <christophg+cb@grenz-bonn.de>
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* Copyright (C) 2013 secunet Security Networks AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/* ======== General PnP configuration functions ======= */
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/*
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* Controlled by the following preprocessor defines:
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* PNP_ENTER_MAGIC_1ST If defined, specifies the first magic byte
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* used to enter config mode.
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* PNP_ENTER_MAGIC_2ND If defined, specifies the second magic byte
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* used to enter config mode.
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* PNP_ENTER_MAGIC_3RD If defined, specifies the third magic byte
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* used to enter config mode.
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* PNP_EXIT_MAGIC_1ST If defined, specifies the first magic byte
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* used to exit config mode.
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*/
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/*
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* Mutex for accesses to the configuration ports (prolog and
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* epilog commands are used, so synchronization is useful)
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*/
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Mutex(CONFIG_MODE_MUTEX, 1)
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/*
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* Enter configuration mode (and aquire mutex)
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* Method must be run before accesssing the configuration region.
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* Parameter is the LDN which should be accessed. Values >= 0xFF mean
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* no LDN switch should be done.
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*/
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Method (ENTER_CONFIG_MODE, 1)
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{
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Acquire (CONFIG_MODE_MUTEX, 0xFFFF)
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#ifdef PNP_ENTER_MAGIC_1ST
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Store (PNP_ENTER_MAGIC_1ST, PNP_ADDR_REG)
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#ifdef PNP_ENTER_MAGIC_2ND
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Store (PNP_ENTER_MAGIC_2ND, PNP_ADDR_REG)
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#ifdef PNP_ENTER_MAGIC_3RD
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Store (PNP_ENTER_MAGIC_3RD, PNP_ADDR_REG)
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#endif
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#endif
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#endif
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If (LLess(Arg0, PNP_NO_LDN_CHANGE)) {
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Store(Arg0, PNP_LOGICAL_DEVICE)
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}
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}
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/*
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* Exit configuration mode (i.e. release mutex)
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* Method must be run after accessing the configuration region.
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*/
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Method (EXIT_CONFIG_MODE)
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{
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#ifdef PNP_EXIT_MAGIC_1ST
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Store (PNP_EXIT_MAGIC_1ST, PNP_ADDR_REG)
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#endif
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Release (CONFIG_MODE_MUTEX)
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}
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/*
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* Just change the LDN. Make sure that you are in config mode (or
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* have otherwise acquired CONFIG_MODE_MUTEX), when calling.
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*/
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Method (SWITCH_LDN, 1)
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{
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Store(Arg0, PNP_LOGICAL_DEVICE)
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}
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