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/*
* 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/vpstate.h>
static u32
nvbios_vpstate_offset(struct nvkm_bios *b)
{
struct bit_entry bit_P;
if (!bit_entry(b, 'P', &bit_P)) {
if (bit_P.version == 2 && bit_P.length >= 0x3c)
return nvbios_rd32(b, bit_P.offset + 0x38);
}
return 0x0000;
}
int
nvbios_vpstate_parse(struct nvkm_bios *b, struct nvbios_vpstate_header *h)
{
if (!h)
return -EINVAL;
h->offset = nvbios_vpstate_offset(b);
if (!h->offset)
return -ENODEV;
h->version = nvbios_rd08(b, h->offset);
switch (h->version) {
case 0x10:
h->hlen = nvbios_rd08(b, h->offset + 0x1);
h->elen = nvbios_rd08(b, h->offset + 0x2);
h->slen = nvbios_rd08(b, h->offset + 0x3);
h->scount = nvbios_rd08(b, h->offset + 0x4);
h->ecount = nvbios_rd08(b, h->offset + 0x5);
h->base_id = nvbios_rd08(b, h->offset + 0x0f);
if (h->hlen > 0x10)
h->boost_id = nvbios_rd08(b, h->offset + 0x10);
else
h->boost_id = 0xff;
if (h->hlen > 0x11)
h->tdp_id = nvbios_rd08(b, h->offset + 0x11);
else
h->tdp_id = 0xff;
return 0;
default:
return -EINVAL;
}
}
int
nvbios_vpstate_entry(struct nvkm_bios *b, struct nvbios_vpstate_header *h,
u8 idx, struct nvbios_vpstate_entry *e)
{
u32 offset;
if (!e || !h || idx > h->ecount)
return -EINVAL;
offset = h->offset + h->hlen + idx * (h->elen + (h->slen * h->scount));
e->pstate = nvbios_rd08(b, offset);
e->clock_mhz = nvbios_rd16(b, offset + 0x5);
return 0;
}
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