cstates.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpigen.h>
#include <southbridge/intel/i82801gx/i82801gx.h>
 
#define MWAIT_RES(state, sub_state)                             \
        {                                                       \
                .space_id = ACPI_ADDRESS_SPACE_FIXED,           \
                .bit_width = ACPI_FFIXEDHW_VENDOR_INTEL,        \
                .bit_offset = ACPI_FFIXEDHW_CLASS_MWAIT,        \
                .access_size = ACPI_ACCESS_SIZE_UNDEFINED,      \
                .addrl = (((state) << 4) | (sub_state)),        \
                .addrh = 0,                                     \
        }
 
static const acpi_cstate_t cst_entries[] = {
        {
                .ctype = 1,
                .latency = 1,
                .power = 1000,
                .resource = MWAIT_RES(0, 0),
        },
        {
                .ctype = 2,
                .latency = 1,
                .power = 500,
                .resource = MWAIT_RES(1, 0),
        },
        {
                .ctype = 3,
                .latency = 17,
                .power = 250,
                .resource = MWAIT_RES(2, 0),
        },
};
 
int get_cst_entries(const acpi_cstate_t **entries)
{
        *entries = cst_entries;
        return ARRAY_SIZE(cst_entries);
}