M0203.c

  1/*
  2 * Copyright 2014 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/M0203.h>
 27
 28u32
 29nvbios_M0203Te(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
 30{
 31	struct bit_entry bit_M;
 32	u32 data = 0x00000000;
 33
 34	if (!bit_entry(bios, 'M', &bit_M)) {
 35		if (bit_M.version == 2 && bit_M.length > 0x04)
 36			data = nvbios_rd16(bios, bit_M.offset + 0x03);
 37		if (data) {
 38			*ver = nvbios_rd08(bios, data + 0x00);
 39			switch (*ver) {
 40			case 0x10:
 41				*hdr = nvbios_rd08(bios, data + 0x01);
 42				*len = nvbios_rd08(bios, data + 0x02);
 43				*cnt = nvbios_rd08(bios, data + 0x03);
 44				return data;
 45			default:
 46				break;
 47			}
 48		}
 49	}
 50
 51	return 0x00000000;
 52}
 53
 54u32
 55nvbios_M0203Tp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
 56	       struct nvbios_M0203T *info)
 57{
 58	u32 data = nvbios_M0203Te(bios, ver, hdr, cnt, len);
 59	memset(info, 0x00, sizeof(*info));
 60	switch (!!data * *ver) {
 61	case 0x10:
 62		info->type    = nvbios_rd08(bios, data + 0x04);
 63		info->pointer = nvbios_rd16(bios, data + 0x05);
 64		break;
 65	default:
 66		break;
 67	}
 68	return data;
 69}
 70
 71u32
 72nvbios_M0203Ee(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
 73{
 74	u8  cnt, len;
 75	u32 data = nvbios_M0203Te(bios, ver, hdr, &cnt, &len);
 76	if (data && idx < cnt) {
 77		data = data + *hdr + idx * len;
 78		*hdr = len;
 79		return data;
 80	}
 81	return 0x00000000;
 82}
 83
 84u32
 85nvbios_M0203Ep(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
 86	       struct nvbios_M0203E *info)
 87{
 88	u32 data = nvbios_M0203Ee(bios, idx, ver, hdr);
 89	memset(info, 0x00, sizeof(*info));
 90	switch (!!data * *ver) {
 91	case 0x10:
 92		info->type  = (nvbios_rd08(bios, data + 0x00) & 0x0f) >> 0;
 93		info->strap = (nvbios_rd08(bios, data + 0x00) & 0xf0) >> 4;
 94		info->group = (nvbios_rd08(bios, data + 0x01) & 0x0f) >> 0;
 95		return data;
 96	default:
 97		break;
 98	}
 99	return 0x00000000;
100}
101
102u32
103nvbios_M0203Em(struct nvkm_bios *bios, u8 ramcfg, u8 *ver, u8 *hdr,
104	       struct nvbios_M0203E *info)
105{
106	struct nvkm_subdev *subdev = &bios->subdev;
107	struct nvbios_M0203T M0203T;
108	u8  cnt, len, idx = 0xff;
109	u32 data;
110
111	if (!nvbios_M0203Tp(bios, ver, hdr, &cnt, &len, &M0203T)) {
112		nvkm_warn(subdev, "M0203T not found\n");
113		return 0x00000000;
114	}
115
116	while ((data = nvbios_M0203Ep(bios, ++idx, ver, hdr, info))) {
117		switch (M0203T.type) {
118		case M0203T_TYPE_RAMCFG:
119			if (info->strap != ramcfg)
120				continue;
121			return data;
122		default:
123			nvkm_warn(subdev, "M0203T type %02x\n", M0203T.type);
124			return 0x00000000;
125		}
126	}
127
128	return data;
129}