/* * This file is part of the coreboot project. * * Copyright (C) 2011 Christoph Grenz <christophg+cb@grenz-bonn.de> * Copyright (C) 2013 secunet Security Networks AG * * 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. */ /* ======== General PnP configuration functions ======= */ /* * Controlled by the following preprocessor defines: * PNP_ENTER_MAGIC_1ST If defined, specifies the first magic byte * used to enter config mode. * PNP_ENTER_MAGIC_2ND If defined, specifies the second magic byte * used to enter config mode. * PNP_ENTER_MAGIC_3RD If defined, specifies the third magic byte * used to enter config mode. * PNP_ENTER_MAGIC_4TH If defined, specifies the fourth magic byte * used to enter config mode. * PNP_EXIT_MAGIC_1ST If defined, specifies the first magic byte * used to exit config mode. * PNP_EXIT_SPECIAL_REG If defined, specifies a special register plus * PNP_EXIT_SPECIAL_VAL a value to be written there to exit config mode. */ /* * Mutex for accesses to the configuration ports (prolog and * epilog commands are used, so synchronization is useful) */ Mutex(CONF_MODE_MUTEX, 1) /* * Enter configuration mode (and aquire mutex) * Method must be run before accesssing the configuration region. * Parameter is the LDN which should be accessed. Values >= 0xFF mean * no LDN switch should be done. */ Method (ENTER_CONFIG_MODE, 1) { Acquire (CONF_MODE_MUTEX, 0xFFFF) #ifdef PNP_ENTER_MAGIC_1ST Store (PNP_ENTER_MAGIC_1ST, PNP_ADDR_REG) #ifdef PNP_ENTER_MAGIC_2ND Store (PNP_ENTER_MAGIC_2ND, PNP_ADDR_REG) #ifdef PNP_ENTER_MAGIC_3RD Store (PNP_ENTER_MAGIC_3RD, PNP_ADDR_REG) #ifdef PNP_ENTER_MAGIC_4TH Store (PNP_ENTER_MAGIC_4TH, PNP_ADDR_REG) #endif #endif #endif #endif If (LLess(Arg0, PNP_NO_LDN_CHANGE)) { Store(Arg0, PNP_LOGICAL_DEVICE) } } /* * Exit configuration mode (i.e. release mutex) * Method must be run after accessing the configuration region. */ Method (EXIT_CONFIG_MODE) { #ifdef PNP_EXIT_MAGIC_1ST Store (PNP_EXIT_MAGIC_1ST, PNP_ADDR_REG) #endif #if defined(PNP_EXIT_SPECIAL_REG) && defined(PNP_EXIT_SPECIAL_VAL) Store (PNP_EXIT_SPECIAL_VAL, PNP_EXIT_SPECIAL_REG) #endif Release (CONF_MODE_MUTEX) } /* * Just change the LDN. Make sure that you are in config mode (or * have otherwise acquired CONF_MODE_MUTEX), when calling. */ Method (SWITCH_LDN, 1) { Store(Arg0, PNP_LOGICAL_DEVICE) }