power_budget.c

  1/*
  2 * Copyright 2016 Karol Herbst
  3 *
  4 * Permission is hereby granted, free of charge, to any person obtaining a
  5 * copy of this software and associated documentation files (the "Software"),
  6 * to deal in the Software without restriction, including without limitation
  7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8 * and/or sell copies of the Software, and to permit persons to whom the
  9 * Software is furnished to do so, subject to the following conditions:
 10 *
 11 * The above copyright notice and this permission notice shall be included in
 12 * all copies or substantial portions of the Software.
 13 *
 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 20 * OTHER DEALINGS IN THE SOFTWARE.
 21 *
 22 * Authors: Karol Herbst
 23 */
 24#include <subdev/bios.h>
 25#include <subdev/bios/bit.h>
 26#include <subdev/bios/power_budget.h>
 27
 28static u32
 29nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt,
 30			  u8 *len)
 31{
 32	struct bit_entry bit_P;
 33	u32 power_budget;
 34
 35	if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 ||
 36	    bit_P.length < 0x30)
 37		return 0;
 38
 39	power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c);
 40	if (!power_budget)
 41		return 0;
 42
 43	*ver = nvbios_rd08(bios, power_budget);
 44	switch (*ver) {
 45	case 0x20:
 46	case 0x30:
 47		*hdr = nvbios_rd08(bios, power_budget + 0x1);
 48		*len = nvbios_rd08(bios, power_budget + 0x2);
 49		*cnt = nvbios_rd08(bios, power_budget + 0x3);
 50		return power_budget;
 51	default:
 52		break;
 53	}
 54
 55	return 0;
 56}
 57
 58int
 59nvbios_power_budget_header(struct nvkm_bios *bios,
 60                           struct nvbios_power_budget *budget)
 61{
 62	u8 ver, hdr, cnt, len, cap_entry;
 63	u32 header;
 64
 65	if (!bios || !budget)
 66		return -EINVAL;
 67
 68	header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);
 69	if (!header || !cnt)
 70		return -ENODEV;
 71
 72	switch (ver) {
 73	case 0x20:
 74		cap_entry = nvbios_rd08(bios, header + 0x9);
 75		break;
 76	case 0x30:
 77		cap_entry = nvbios_rd08(bios, header + 0xa);
 78		break;
 79	default:
 80		cap_entry = 0xff;
 81	}
 82
 83	if (cap_entry >= cnt && cap_entry != 0xff) {
 84		nvkm_warn(&bios->subdev,
 85		          "invalid cap_entry in power budget table found\n");
 86		budget->cap_entry = 0xff;
 87		return -EINVAL;
 88	}
 89
 90	budget->offset = header;
 91	budget->ver = ver;
 92	budget->hlen = hdr;
 93	budget->elen = len;
 94	budget->ecount = cnt;
 95
 96	budget->cap_entry = cap_entry;
 97
 98	return 0;
 99}
100
101int
102nvbios_power_budget_entry(struct nvkm_bios *bios,
103                          struct nvbios_power_budget *budget,
104                          u8 idx, struct nvbios_power_budget_entry *entry)
105{
106	u32 entry_offset;
107
108	if (!bios || !budget || !budget->offset || idx >= budget->ecount
109		|| !entry)
110		return -EINVAL;
111
112	entry_offset = budget->offset + budget->hlen + idx * budget->elen;
113
114	if (budget->ver >= 0x20) {
115		entry->min_w = nvbios_rd32(bios, entry_offset + 0x2);
116		entry->avg_w = nvbios_rd32(bios, entry_offset + 0x6);
117		entry->max_w = nvbios_rd32(bios, entry_offset + 0xa);
118	} else {
119		entry->min_w = 0;
120		entry->max_w = nvbios_rd32(bios, entry_offset + 0x2);
121		entry->avg_w = entry->max_w;
122	}
123
124	return 0;
125}