diff options
Diffstat (limited to 'src/superio/acpi/pnp_config.asl')
| -rw-r--r-- | src/superio/acpi/pnp_config.asl | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/superio/acpi/pnp_config.asl b/src/superio/acpi/pnp_config.asl new file mode 100644 index 0000000000..79dca9f86a --- /dev/null +++ b/src/superio/acpi/pnp_config.asl @@ -0,0 +1,84 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* ======== 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_EXIT_MAGIC_1ST If defined, specifies the first magic byte + * used to exit config mode. + */ + + +/* + * Mutex for accesses to the configuration ports (prolog and + * epilog commands are used, so synchronization is useful) + */ +Mutex(CONFIG_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 (CONFIG_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) +#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 + Release (CONFIG_MODE_MUTEX) +} + +/* + * Just change the LDN. Make sure that you are in config mode (or + * have otherwise acquired CONFIG_MODE_MUTEX), when calling. + */ +Method (SWITCH_LDN, 1) +{ + Store(Arg0, PNP_LOGICAL_DEVICE) +} |