| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| /* ======== 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 acquire mutex) |
| * Method must be run before accessing 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 |
| PNP_ADDR_REG = PNP_ENTER_MAGIC_1ST |
| #ifdef PNP_ENTER_MAGIC_2ND |
| PNP_ADDR_REG = PNP_ENTER_MAGIC_2ND |
| #ifdef PNP_ENTER_MAGIC_3RD |
| PNP_ADDR_REG = PNP_ENTER_MAGIC_3RD |
| #ifdef PNP_ENTER_MAGIC_4TH |
| PNP_ADDR_REG = PNP_ENTER_MAGIC_4TH |
| #endif |
| #endif |
| #endif |
| #endif |
| If (Arg0 < PNP_NO_LDN_CHANGE) { |
| PNP_LOGICAL_DEVICE = Arg0 |
| } |
| } |
| |
| /* |
| * 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 |
| PNP_ADDR_REG = PNP_EXIT_MAGIC_1ST |
| #endif |
| #if defined(PNP_EXIT_SPECIAL_REG) && defined(PNP_EXIT_SPECIAL_VAL) |
| PNP_EXIT_SPECIAL_REG = PNP_EXIT_SPECIAL_VAL |
| #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) |
| { |
| PNP_LOGICAL_DEVICE = Arg0 |
| } |