/*
 * Copyright 2016 Karol Herbst
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Karol Herbst
 */
#include <subdev/bios.h>
#include <subdev/bios/bit.h>
#include <subdev/bios/power_budget.h>

static u32
nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt,
                          u8 *len)
{
        struct bit_entry bit_P;
        u32 power_budget;

        if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 ||
            bit_P.length < 0x30)
                return 0;

        power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c);
        if (!power_budget)
                return 0;

        *ver = nvbios_rd08(bios, power_budget);
        switch (*ver) {
        case 0x20:
        case 0x30:
                *hdr = nvbios_rd08(bios, power_budget + 0x1);
                *len = nvbios_rd08(bios, power_budget + 0x2);
                *cnt = nvbios_rd08(bios, power_budget + 0x3);
                return power_budget;
        default:
                break;
        }

        return 0;
}

int
nvbios_power_budget_header(struct nvkm_bios *bios,
                           struct nvbios_power_budget *budget)
{
        u8 ver, hdr, cnt, len, cap_entry;
        u32 header;

        if (!bios || !budget)
                return -EINVAL;

        header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);
        if (!header || !cnt)
                return -ENODEV;

        switch (ver) {
        case 0x20:
                cap_entry = nvbios_rd08(bios, header + 0x9);
                break;
        case 0x30:
                cap_entry = nvbios_rd08(bios, header + 0xa);
                break;
        default:
                cap_entry = 0xff;
        }

        if (cap_entry >= cnt && cap_entry != 0xff) {
                nvkm_warn(&bios->subdev,
                          "invalid cap_entry in power budget table found\n");
                budget->cap_entry = 0xff;
                return -EINVAL;
        }

        budget->offset = header;
        budget->ver = ver;
        budget->hlen = hdr;
        budget->elen = len;
        budget->ecount = cnt;

        budget->cap_entry = cap_entry;

        return 0;
}

int
nvbios_power_budget_entry(struct nvkm_bios *bios,
                          struct nvbios_power_budget *budget,
                          u8 idx, struct nvbios_power_budget_entry *entry)
{
        u32 entry_offset;

        if (!bios || !budget || !budget->offset || idx >= budget->ecount
                || !entry)
                return -EINVAL;

        entry_offset = budget->offset + budget->hlen + idx * budget->elen;

        if (budget->ver >= 0x20) {
                entry->min_w = nvbios_rd32(bios, entry_offset + 0x2);
                entry->avg_w = nvbios_rd32(bios, entry_offset + 0x6);
                entry->max_w = nvbios_rd32(bios, entry_offset + 0xa);
        } else {
                entry->min_w = 0;
                entry->max_w = nvbios_rd32(bios, entry_offset + 0x2);
                entry->avg_w = entry->max_w;
        }

        return 0;
}