subdev/bios/vpstate.c

0001 /*
0002  * Copyright 2016 Karol Herbst
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Karol Herbst
0023  */
0024 #include <subdev/bios.h>
0025 #include <subdev/bios/bit.h>
0026 #include <subdev/bios/vpstate.h>
0027
0028 static u32
0029 nvbios_vpstate_offset(struct nvkm_bios *b)
0030 {
0031     struct bit_entry bit_P;
0032
0033     if (!bit_entry(b, 'P', &bit_P)) {
0034         if (bit_P.version == 2 && bit_P.length >= 0x3c)
0035             return nvbios_rd32(b, bit_P.offset + 0x38);
0036     }
0037
0038     return 0x0000;
0039 }
0040
0041 int
0042 nvbios_vpstate_parse(struct nvkm_bios *b, struct nvbios_vpstate_header *h)
0043 {
0044     if (!h)
0045         return -EINVAL;
0046
0047     h->offset = nvbios_vpstate_offset(b);
0048     if (!h->offset)
0049         return -ENODEV;
0050
0051     h->version = nvbios_rd08(b, h->offset);
0052     switch (h->version) {
0053     case 0x10:
0054         h->hlen     = nvbios_rd08(b, h->offset + 0x1);
0055         h->elen     = nvbios_rd08(b, h->offset + 0x2);
0056         h->slen     = nvbios_rd08(b, h->offset + 0x3);
0057         h->scount   = nvbios_rd08(b, h->offset + 0x4);
0058         h->ecount   = nvbios_rd08(b, h->offset + 0x5);
0059
0060         h->base_id  = nvbios_rd08(b, h->offset + 0x0f);
0061         if (h->hlen > 0x10)
0062             h->boost_id = nvbios_rd08(b, h->offset + 0x10);
0063         else
0064             h->boost_id = 0xff;
0065         if (h->hlen > 0x11)
0066             h->tdp_id = nvbios_rd08(b, h->offset + 0x11);
0067         else
0068             h->tdp_id = 0xff;
0069         return 0;
0070     default:
0071         return -EINVAL;
0072     }
0073 }
0074
0075 int
0076 nvbios_vpstate_entry(struct nvkm_bios *b, struct nvbios_vpstate_header *h,
0077              u8 idx, struct nvbios_vpstate_entry *e)
0078 {
0079     u32 offset;
0080
0081     if (!e || !h || idx > h->ecount)
0082         return -EINVAL;
0083
0084     offset = h->offset + h->hlen + idx * (h->elen + (h->slen * h->scount));
0085     e->pstate    = nvbios_rd08(b, offset);
0086     e->clock_mhz = nvbios_rd16(b, offset + 0x5);
0087     return 0;
0088 }