| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <acpi/acpigen.h> |
| #include <console/console.h> |
| #include <intelblocks/acpi.h> |
| #include <types.h> |
| |
| #define LPI_S0_HELPER_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66" |
| #define SYSTEM_POWER_MANAGEMENT_HID "INT33A1" |
| #define SYSTEM_POWER_MANAGEMENT_CID "PNP0D80" |
| #define EC_S0IX_HOOK "\\_SB.PCI0.LPCB.EC0.S0IX" |
| #define MAINBOARD_HOOK "\\_SB.MS0X" |
| #define ENABLE_PM_BITS_HOOK "\\_SB.PCI0.EGPM" |
| #define RESTORE_PM_BITS_HOOK "\\_SB.PCI0.RGPM" |
| #define LPI_STATES_ALL 0xff |
| #define MIN_DEVICE_STATE ACPI_DEVICE_SLEEP_D0 |
| #define PEPD_SCOPE "\\_SB.PCI0" |
| |
| /* |
| * For now there is only one disabled non-existent device, because Windows |
| * expects at least one device and crashes without it with a bluescreen |
| * (`INTERNAL_POWER_ERROR`). Returning an empty package does not work. |
| */ |
| static void lpi_get_constraints(void *unused) |
| { |
| /* |
| * Return (Package() { |
| * Package() { "\NULL", 0, |
| * Package() { 0, |
| * Package() { 0xff, 0 }}}}) |
| */ |
| acpigen_emit_byte(RETURN_OP); |
| acpigen_write_package(1); |
| { |
| acpigen_write_package(3); |
| { |
| acpigen_emit_namestring("\\NULL"); |
| acpigen_write_integer(0); /* device disabled */ |
| acpigen_write_package(2); |
| { |
| acpigen_write_integer(0); /* revision */ |
| acpigen_write_package(2); |
| { |
| acpigen_write_integer(LPI_STATES_ALL); |
| acpigen_write_integer(MIN_DEVICE_STATE); |
| } |
| acpigen_write_package_end(); |
| } |
| acpigen_write_package_end(); |
| } |
| acpigen_write_package_end(); |
| } |
| acpigen_write_package_end(); |
| } |
| |
| static void lpi_s0ix_entry(void *unused) |
| { |
| /* Inform the EC */ |
| acpigen_write_if_cond_ref_of(EC_S0IX_HOOK); |
| acpigen_emit_namestring(EC_S0IX_HOOK); |
| acpigen_write_integer(1); |
| acpigen_write_if_end(); |
| |
| /* Provide a board level S0ix hook */ |
| acpigen_write_if_cond_ref_of(MAINBOARD_HOOK); |
| acpigen_emit_namestring(MAINBOARD_HOOK); |
| acpigen_write_integer(1); |
| acpigen_write_if_end(); |
| |
| /* Save the current PM bits then enable GPIO PM with |
| MISCCFG_GPIO_PM_CONFIG_BITS */ |
| acpigen_write_if_cond_ref_of(ENABLE_PM_BITS_HOOK); |
| acpigen_emit_namestring(ENABLE_PM_BITS_HOOK); |
| acpigen_write_if_end(); |
| } |
| |
| static void lpi_s0ix_exit(void *unused) |
| { |
| /* Inform the EC */ |
| acpigen_write_if_cond_ref_of(EC_S0IX_HOOK); |
| acpigen_emit_namestring(EC_S0IX_HOOK); |
| acpigen_write_integer(0); |
| acpigen_write_if_end(); |
| |
| /* Provide a board level S0ix hook */ |
| acpigen_write_if_cond_ref_of(MAINBOARD_HOOK); |
| acpigen_emit_namestring(MAINBOARD_HOOK); |
| acpigen_write_integer(0); |
| acpigen_write_if_end(); |
| |
| /* Restore GPIO all Community PM */ |
| acpigen_write_if_cond_ref_of(RESTORE_PM_BITS_HOOK); |
| acpigen_emit_namestring(RESTORE_PM_BITS_HOOK); |
| acpigen_write_if_end(); |
| } |
| |
| static void (*lpi_s0_helpers[])(void *) = { |
| NULL, /* enumerate functions (autogenerated) */ |
| lpi_get_constraints, /* get device constraints */ |
| NULL, /* get crash dump device */ |
| NULL, /* display off notify */ |
| NULL, /* display on notify */ |
| lpi_s0ix_entry, /* s0ix entry */ |
| lpi_s0ix_exit, /* s0ix exit */ |
| }; |
| |
| void generate_acpi_power_engine(void) |
| { |
| acpigen_write_scope(PEPD_SCOPE); |
| acpigen_write_device("PEPD"); |
| |
| acpigen_write_name_string("_HID", SYSTEM_POWER_MANAGEMENT_HID); |
| acpigen_write_name("_CID"); |
| acpigen_emit_eisaid(SYSTEM_POWER_MANAGEMENT_CID); |
| |
| acpigen_write_dsm(LPI_S0_HELPER_UUID, lpi_s0_helpers, ARRAY_SIZE(lpi_s0_helpers), NULL); |
| |
| acpigen_write_device_end(); |
| acpigen_write_scope_end(); |
| |
| printk(BIOS_INFO, PEPD_SCOPE ".PEPD: Intel Power Engine Plug-in\n"); |
| } |