diff options
| author | Raul E Rangel <rrangel@chromium.org> | 2021-04-19 15:58:25 -0600 |
|---|---|---|
| committer | Raul Rangel <rrangel@chromium.org> | 2021-04-21 22:27:55 +0000 |
| commit | c7048323f4a635ec854b2792a00ae47b1775d9f7 (patch) | |
| tree | 63ea85da1bd8e70da54c88c2cda74d28e3f17577 /src/acpi | |
| parent | a89a4ea8ea04aaf369cd99f487f3537fe9e46702 (diff) | |
acpi: Add acpigen_write_LPI_package
Low Power Idle States defines additional information not present in the
_CST.
See ACPI Specification, Version 6.3 Section 8.4.4.3 _LPI.
BUG=b:178728116, b:185787242
TEST=Boot guybrush and dump ACPI tables
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Signed-off-by: Jason Glenesk <jason.glenesk@amd.corp-partner.google.com>
Change-Id: I4f5301b95ff8245facaf48e2fbd51cc82df2d8cc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52529
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Diffstat (limited to 'src/acpi')
| -rw-r--r-- | src/acpi/acpigen.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/acpi/acpigen.c b/src/acpi/acpigen.c index 1131729da5..5c8c1b98c1 100644 --- a/src/acpi/acpigen.c +++ b/src/acpi/acpigen.c @@ -803,6 +803,78 @@ void acpigen_write_STA_ext(const char *namestring) acpigen_pop_len(); } +void acpigen_write_LPI_package(u64 level, const struct acpi_lpi_state *states, u16 nentries) +{ + /* + * Name (_LPI, Package (0x06) // _LPI: Low Power Idle States + * { + * 0x0000, + * 0x0000000000000000, + * 0x0003, + * Package (0x0A) + * { + * 0x00000002, + * 0x00000001, + * 0x00000001, + * 0x00000000, + * 0x00000000, + * 0x00000000, + * ResourceTemplate () + * { + * Register (FFixedHW, + * 0x02, // Bit Width + * 0x02, // Bit Offset + * 0x0000000000000000, // Address + * ,) + * }, + * + * ResourceTemplate () + * { + * Register (SystemMemory, + * 0x00, // Bit Width + * 0x00, // Bit Offset + * 0x0000000000000000, // Address + * ,) + * }, + * + * ResourceTemplate () + * { + * Register (SystemMemory, + * 0x00, // Bit Width + * 0x00, // Bit Offset + * 0x0000000000000000, // Address + * ,) + * }, + * + * "C1" + * }, + * ... + * } + */ + + acpigen_write_name("_LPI"); + acpigen_write_package(3 + nentries); + acpigen_write_word(0); /* Revision */ + acpigen_write_qword(level); + acpigen_write_word(nentries); + + for (size_t i = 0; i < nentries; i++, states++) { + acpigen_write_package(0xA); + acpigen_write_dword(states->min_residency_us); + acpigen_write_dword(states->worst_case_wakeup_latency_us); + acpigen_write_dword(states->flags); + acpigen_write_dword(states->arch_context_lost_flags); + acpigen_write_dword(states->residency_counter_frequency_hz); + acpigen_write_dword(states->enabled_parent_state); + acpigen_write_register_resource(&states->entry_method); + acpigen_write_register_resource(&states->residency_counter_register); + acpigen_write_register_resource(&states->usage_counter_register); + acpigen_write_string(states->state_name); + acpigen_pop_len(); + } + acpigen_pop_len(); +} + /* * Generates a func with max supported P-states. */ |