/*
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* Copyright 2016 Karol Herbst
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Karol Herbst
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*/
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#include <subdev/bios.h>
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#include <subdev/bios/bit.h>
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#include <subdev/bios/vpstate.h>
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static u32
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nvbios_vpstate_offset(struct nvkm_bios *b)
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{
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struct bit_entry bit_P;
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if (!bit_entry(b, 'P', &bit_P)) {
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if (bit_P.version == 2 && bit_P.length >= 0x3c)
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return nvbios_rd32(b, bit_P.offset + 0x38);
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}
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return 0x0000;
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}
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int
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nvbios_vpstate_parse(struct nvkm_bios *b, struct nvbios_vpstate_header *h)
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{
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if (!h)
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return -EINVAL;
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h->offset = nvbios_vpstate_offset(b);
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if (!h->offset)
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return -ENODEV;
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h->version = nvbios_rd08(b, h->offset);
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switch (h->version) {
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case 0x10:
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h->hlen = nvbios_rd08(b, h->offset + 0x1);
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h->elen = nvbios_rd08(b, h->offset + 0x2);
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h->slen = nvbios_rd08(b, h->offset + 0x3);
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h->scount = nvbios_rd08(b, h->offset + 0x4);
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h->ecount = nvbios_rd08(b, h->offset + 0x5);
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h->base_id = nvbios_rd08(b, h->offset + 0x0f);
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if (h->hlen > 0x10)
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h->boost_id = nvbios_rd08(b, h->offset + 0x10);
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else
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h->boost_id = 0xff;
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if (h->hlen > 0x11)
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h->tdp_id = nvbios_rd08(b, h->offset + 0x11);
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else
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h->tdp_id = 0xff;
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return 0;
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default:
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return -EINVAL;
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}
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}
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int
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nvbios_vpstate_entry(struct nvkm_bios *b, struct nvbios_vpstate_header *h,
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u8 idx, struct nvbios_vpstate_entry *e)
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{
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u32 offset;
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if (!e || !h || idx > h->ecount)
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return -EINVAL;
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offset = h->offset + h->hlen + idx * (h->elen + (h->slen * h->scount));
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e->pstate = nvbios_rd08(b, offset);
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e->clock_mhz = nvbios_rd16(b, offset + 0x5);
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return 0;
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}
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