Tim Wawrzynczak | 6424648 | 2021-06-25 22:44:45 -0600 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | |
| 3 | #include <acpi/acpigen.h> |
| 4 | #include <console/console.h> |
| 5 | #include <intelblocks/acpi.h> |
| 6 | #include <types.h> |
| 7 | |
| 8 | #define LPI_S0_HELPER_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66" |
| 9 | #define SYSTEM_POWER_MANAGEMENT_HID "INT33A1" |
| 10 | #define SYSTEM_POWER_MANAGEMENT_CID "PNP0D80" |
| 11 | #define EC_S0IX_HOOK "\\_SB.PCI0.LPCB.EC0.S0IX" |
| 12 | #define MAINBOARD_HOOK "\\_SB.MS0X" |
| 13 | #define ENABLE_PM_BITS_HOOK "\\_SB.PCI0.EGPM" |
| 14 | #define RESTORE_PM_BITS_HOOK "\\_SB.PCI0.RGPM" |
| 15 | #define LPI_STATES_ALL 0xff |
| 16 | #define MIN_DEVICE_STATE ACPI_DEVICE_SLEEP_D0 |
| 17 | #define PEPD_SCOPE "\\_SB.PCI0" |
| 18 | |
| 19 | /* |
| 20 | * For now there is only one disabled non-existent device, because Windows |
| 21 | * expects at least one device and crashes without it with a bluescreen |
| 22 | * (`INTERNAL_POWER_ERROR`). Returning an empty package does not work. |
| 23 | */ |
| 24 | static void lpi_get_constraints(void *unused) |
| 25 | { |
| 26 | /* |
| 27 | * Return (Package() { |
| 28 | * Package() { "\NULL", 0, |
| 29 | * Package() { 0, |
| 30 | * Package() { 0xff, 0 }}}}) |
| 31 | */ |
| 32 | acpigen_emit_byte(RETURN_OP); |
| 33 | acpigen_write_package(1); |
| 34 | { |
| 35 | acpigen_write_package(3); |
| 36 | { |
| 37 | acpigen_emit_namestring("\\NULL"); |
| 38 | acpigen_write_integer(0); /* device disabled */ |
| 39 | acpigen_write_package(2); |
| 40 | { |
| 41 | acpigen_write_integer(0); /* revision */ |
| 42 | acpigen_write_package(2); |
| 43 | { |
| 44 | acpigen_write_integer(LPI_STATES_ALL); |
| 45 | acpigen_write_integer(MIN_DEVICE_STATE); |
| 46 | } |
| 47 | acpigen_write_package_end(); |
| 48 | } |
| 49 | acpigen_write_package_end(); |
| 50 | } |
| 51 | acpigen_write_package_end(); |
| 52 | } |
| 53 | acpigen_write_package_end(); |
| 54 | } |
| 55 | |
| 56 | static void lpi_s0ix_entry(void *unused) |
| 57 | { |
| 58 | /* Inform the EC */ |
| 59 | acpigen_write_if_cond_ref_of(EC_S0IX_HOOK); |
| 60 | acpigen_emit_namestring(EC_S0IX_HOOK); |
| 61 | acpigen_write_integer(1); |
| 62 | acpigen_write_if_end(); |
| 63 | |
| 64 | /* Provide a board level S0ix hook */ |
| 65 | acpigen_write_if_cond_ref_of(MAINBOARD_HOOK); |
| 66 | acpigen_emit_namestring(MAINBOARD_HOOK); |
| 67 | acpigen_write_integer(1); |
| 68 | acpigen_write_if_end(); |
| 69 | |
| 70 | /* Save the current PM bits then enable GPIO PM with |
| 71 | MISCCFG_GPIO_PM_CONFIG_BITS */ |
| 72 | acpigen_write_if_cond_ref_of(ENABLE_PM_BITS_HOOK); |
| 73 | acpigen_emit_namestring(ENABLE_PM_BITS_HOOK); |
| 74 | acpigen_write_if_end(); |
| 75 | } |
| 76 | |
| 77 | static void lpi_s0ix_exit(void *unused) |
| 78 | { |
| 79 | /* Inform the EC */ |
| 80 | acpigen_write_if_cond_ref_of(EC_S0IX_HOOK); |
| 81 | acpigen_emit_namestring(EC_S0IX_HOOK); |
| 82 | acpigen_write_integer(0); |
| 83 | acpigen_write_if_end(); |
| 84 | |
| 85 | /* Provide a board level S0ix hook */ |
| 86 | acpigen_write_if_cond_ref_of(MAINBOARD_HOOK); |
| 87 | acpigen_emit_namestring(MAINBOARD_HOOK); |
| 88 | acpigen_write_integer(0); |
| 89 | acpigen_write_if_end(); |
| 90 | |
| 91 | /* Restore GPIO all Community PM */ |
| 92 | acpigen_write_if_cond_ref_of(RESTORE_PM_BITS_HOOK); |
| 93 | acpigen_emit_namestring(RESTORE_PM_BITS_HOOK); |
| 94 | acpigen_write_if_end(); |
| 95 | } |
| 96 | |
| 97 | static void (*lpi_s0_helpers[])(void *) = { |
| 98 | NULL, /* enumerate functions (autogenerated) */ |
| 99 | lpi_get_constraints, /* get device constraints */ |
| 100 | NULL, /* get crash dump device */ |
| 101 | NULL, /* display off notify */ |
| 102 | NULL, /* display on notify */ |
| 103 | lpi_s0ix_entry, /* s0ix entry */ |
| 104 | lpi_s0ix_exit, /* s0ix exit */ |
| 105 | }; |
| 106 | |
| 107 | void generate_acpi_power_engine(void) |
| 108 | { |
| 109 | acpigen_write_scope(PEPD_SCOPE); |
| 110 | acpigen_write_device("PEPD"); |
| 111 | |
| 112 | acpigen_write_name_string("_HID", SYSTEM_POWER_MANAGEMENT_HID); |
| 113 | acpigen_write_name("_CID"); |
| 114 | acpigen_emit_eisaid(SYSTEM_POWER_MANAGEMENT_CID); |
| 115 | |
| 116 | acpigen_write_dsm(LPI_S0_HELPER_UUID, lpi_s0_helpers, ARRAY_SIZE(lpi_s0_helpers), NULL); |
| 117 | |
| 118 | acpigen_write_device_end(); |
| 119 | acpigen_write_scope_end(); |
| 120 | |
| 121 | printk(BIOS_INFO, PEPD_SCOPE ".PEPD: Intel Power Engine Plug-in\n"); |
| 122 | } |