168651Skris/*	$NetBSD: nouveau_nvkm_subdev_bios_cstep.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
268651Skris
368651Skris/*
468651Skris * Copyright 2013 Red Hat Inc.
568651Skris *
668651Skris * Permission is hereby granted, free of charge, to any person obtaining a
768651Skris * copy of this software and associated documentation files (the "Software"),
868651Skris * to deal in the Software without restriction, including without limitation
968651Skris * the rights to use, copy, modify, merge, publish, distribute, sublicense,
1068651Skris * and/or sell copies of the Software, and to permit persons to whom the
1168651Skris * Software is furnished to do so, subject to the following conditions:
1268651Skris *
1368651Skris * The above copyright notice and this permission notice shall be included in
1468651Skris * all copies or substantial portions of the Software.
1568651Skris *
1676866Skris * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
1768651Skris * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
1876866Skris * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
1976866Skris * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
2076866Skris * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
2176866Skris * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
2276866Skris * OTHER DEALINGS IN THE SOFTWARE.
2376866Skris *
2476866Skris * Authors: Ben Skeggs
2576866Skris */
2676866Skris#include <sys/cdefs.h>
2776866Skris__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_cstep.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
28100928Snectar
29100928Snectar#include <subdev/bios.h>
30100928Snectar#include <subdev/bios/bit.h>
31100928Snectar#include <subdev/bios/cstep.h>
32100928Snectar
33100928Snectaru32
34100928Snectarnvbios_cstepTe(struct nvkm_bios *bios,
35100928Snectar	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *xnr, u8 *xsz)
36100928Snectar{
37100928Snectar	struct bit_entry bit_P;
38100928Snectar	u32 cstep = 0;
39100928Snectar
40100928Snectar	if (!bit_entry(bios, 'P', &bit_P)) {
41100928Snectar		if (bit_P.version == 2 && bit_P.length >= 0x38)
42237657Sjkim			cstep = nvbios_rd32(bios, bit_P.offset + 0x34);
43237657Sjkim
44237657Sjkim		if (cstep) {
45237657Sjkim			*ver = nvbios_rd08(bios, cstep + 0);
46237657Sjkim			switch (*ver) {
47237657Sjkim			case 0x10:
48237657Sjkim				*hdr = nvbios_rd08(bios, cstep + 1);
49237657Sjkim				*cnt = nvbios_rd08(bios, cstep + 3);
50237657Sjkim				*len = nvbios_rd08(bios, cstep + 2);
51237657Sjkim				*xnr = nvbios_rd08(bios, cstep + 5);
52100928Snectar				*xsz = nvbios_rd08(bios, cstep + 4);
5368651Skris				return cstep;
5468651Skris			default:
5568651Skris				break;
5668651Skris			}
5768651Skris		}
5868651Skris	}
5968651Skris
6068651Skris	return 0;
6168651Skris}
6268651Skris
6368651Skrisu32
6468651Skrisnvbios_cstepEe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
6568651Skris{
6668651Skris	u8  cnt, len, xnr, xsz;
6768651Skris	u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
6868651Skris	if (data && idx < cnt) {
6968651Skris		data = data + *hdr + (idx * len);
7068651Skris		*hdr = len;
7176866Skris		return data;
72100928Snectar	}
73100928Snectar	return 0;
7468651Skris}
7568651Skris
76u32
77nvbios_cstepEp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
78	       struct nvbios_cstepE *info)
79{
80	u32 data = nvbios_cstepEe(bios, idx, ver, hdr);
81	memset(info, 0x00, sizeof(*info));
82	if (data) {
83		info->pstate = (nvbios_rd16(bios, data + 0x00) & 0x01e0) >> 5;
84		info->index   = nvbios_rd08(bios, data + 0x03);
85	}
86	return data;
87}
88
89u32
90nvbios_cstepEm(struct nvkm_bios *bios, u8 pstate, u8 *ver, u8 *hdr,
91	       struct nvbios_cstepE *info)
92{
93	u32 data, idx = 0;
94	while ((data = nvbios_cstepEp(bios, idx++, ver, hdr, info))) {
95		if (info->pstate == pstate)
96			break;
97	}
98	return data;
99}
100
101u32
102nvbios_cstepXe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
103{
104	u8  cnt, len, xnr, xsz;
105	u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
106	if (data && idx < xnr) {
107		data = data + *hdr + (cnt * len) + (idx * xsz);
108		*hdr = xsz;
109		return data;
110	}
111	return 0;
112}
113
114u32
115nvbios_cstepXp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
116	       struct nvbios_cstepX *info)
117{
118	u32 data = nvbios_cstepXe(bios, idx, ver, hdr);
119	memset(info, 0x00, sizeof(*info));
120	if (data) {
121		info->freq    = nvbios_rd16(bios, data + 0x00) * 1000;
122		info->unkn[0] = nvbios_rd08(bios, data + 0x02);
123		info->unkn[1] = nvbios_rd08(bios, data + 0x03);
124		info->voltage = nvbios_rd08(bios, data + 0x04);
125	}
126	return data;
127}
128