cstep.c

  1/*
  2 * Copyright 2013 Red Hat Inc.
  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: Ben Skeggs
 23 */
 24#include <subdev/bios.h>
 25#include <subdev/bios/bit.h>
 26#include <subdev/bios/cstep.h>
 27
 28u32
 29nvbios_cstepTe(struct nvkm_bios *bios,
 30	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *xnr, u8 *xsz)
 31{
 32	struct bit_entry bit_P;
 33	u32 cstep = 0;
 34
 35	if (!bit_entry(bios, 'P', &bit_P)) {
 36		if (bit_P.version == 2 && bit_P.length >= 0x38)
 37			cstep = nvbios_rd32(bios, bit_P.offset + 0x34);
 38
 39		if (cstep) {
 40			*ver = nvbios_rd08(bios, cstep + 0);
 41			switch (*ver) {
 42			case 0x10:
 43				*hdr = nvbios_rd08(bios, cstep + 1);
 44				*cnt = nvbios_rd08(bios, cstep + 3);
 45				*len = nvbios_rd08(bios, cstep + 2);
 46				*xnr = nvbios_rd08(bios, cstep + 5);
 47				*xsz = nvbios_rd08(bios, cstep + 4);
 48				return cstep;
 49			default:
 50				break;
 51			}
 52		}
 53	}
 54
 55	return 0;
 56}
 57
 58u32
 59nvbios_cstepEe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
 60{
 61	u8  cnt, len, xnr, xsz;
 62	u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
 63	if (data && idx < cnt) {
 64		data = data + *hdr + (idx * len);
 65		*hdr = len;
 66		return data;
 67	}
 68	return 0;
 69}
 70
 71u32
 72nvbios_cstepEp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
 73	       struct nvbios_cstepE *info)
 74{
 75	u32 data = nvbios_cstepEe(bios, idx, ver, hdr);
 76	memset(info, 0x00, sizeof(*info));
 77	if (data) {
 78		info->pstate = (nvbios_rd16(bios, data + 0x00) & 0x01e0) >> 5;
 79		info->index   = nvbios_rd08(bios, data + 0x03);
 80	}
 81	return data;
 82}
 83
 84u32
 85nvbios_cstepEm(struct nvkm_bios *bios, u8 pstate, u8 *ver, u8 *hdr,
 86	       struct nvbios_cstepE *info)
 87{
 88	u32 data, idx = 0;
 89	while ((data = nvbios_cstepEp(bios, idx++, ver, hdr, info))) {
 90		if (info->pstate == pstate)
 91			break;
 92	}
 93	return data;
 94}
 95
 96u32
 97nvbios_cstepXe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
 98{
 99	u8  cnt, len, xnr, xsz;
100	u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
101	if (data && idx < xnr) {
102		data = data + *hdr + (cnt * len) + (idx * xsz);
103		*hdr = xsz;
104		return data;
105	}
106	return 0;
107}
108
109u32
110nvbios_cstepXp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
111	       struct nvbios_cstepX *info)
112{
113	u32 data = nvbios_cstepXe(bios, idx, ver, hdr);
114	memset(info, 0x00, sizeof(*info));
115	if (data) {
116		info->freq    = nvbios_rd16(bios, data + 0x00) * 1000;
117		info->unkn[0] = nvbios_rd08(bios, data + 0x02);
118		info->unkn[1] = nvbios_rd08(bios, data + 0x03);
119		info->voltage = nvbios_rd08(bios, data + 0x04);
120	}
121	return data;
122}