mxms.c

  1/*
  2 * Copyright 2012 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 "mxms.h"
 25
 26#define ROM16(x) get_unaligned_le16(&(x))
 27#define ROM32(x) get_unaligned_le32(&(x))
 28
 29static u8 *
 30mxms_data(struct nvkm_mxm *mxm)
 31{
 32	return mxm->mxms;
 33
 34}
 35
 36u16
 37mxms_version(struct nvkm_mxm *mxm)
 38{
 39	u8 *mxms = mxms_data(mxm);
 40	u16 version = (mxms[4] << 8) | mxms[5];
 41	switch (version ) {
 42	case 0x0200:
 43	case 0x0201:
 44	case 0x0300:
 45		return version;
 46	default:
 47		break;
 48	}
 49
 50	nvkm_debug(&mxm->subdev, "unknown version %d.%d\n", mxms[4], mxms[5]);
 51	return 0x0000;
 52}
 53
 54u16
 55mxms_headerlen(struct nvkm_mxm *mxm)
 56{
 57	return 8;
 58}
 59
 60u16
 61mxms_structlen(struct nvkm_mxm *mxm)
 62{
 63	return *(u16 *)&mxms_data(mxm)[6];
 64}
 65
 66bool
 67mxms_checksum(struct nvkm_mxm *mxm)
 68{
 69	u16 size = mxms_headerlen(mxm) + mxms_structlen(mxm);
 70	u8 *mxms = mxms_data(mxm), sum = 0;
 71	while (size--)
 72		sum += *mxms++;
 73	if (sum) {
 74		nvkm_debug(&mxm->subdev, "checksum invalid\n");
 75		return false;
 76	}
 77	return true;
 78}
 79
 80bool
 81mxms_valid(struct nvkm_mxm *mxm)
 82{
 83	u8 *mxms = mxms_data(mxm);
 84	if (*(u32 *)mxms != 0x5f4d584d) {
 85		nvkm_debug(&mxm->subdev, "signature invalid\n");
 86		return false;
 87	}
 88
 89	if (!mxms_version(mxm) || !mxms_checksum(mxm))
 90		return false;
 91
 92	return true;
 93}
 94
 95bool
 96mxms_foreach(struct nvkm_mxm *mxm, u8 types,
 97	     bool (*exec)(struct nvkm_mxm *, u8 *, void *), void *info)
 98{
 99	struct nvkm_subdev *subdev = &mxm->subdev;
100	u8 *mxms = mxms_data(mxm);
101	u8 *desc = mxms + mxms_headerlen(mxm);
102	u8 *fini = desc + mxms_structlen(mxm) - 1;
103	while (desc < fini) {
104		u8 type = desc[0] & 0x0f;
105		u8 headerlen = 0;
106		u8 recordlen = 0;
107		u8 entries = 0;
108
109		switch (type) {
110		case 0: /* Output Device Structure */
111			if (mxms_version(mxm) >= 0x0300)
112				headerlen = 8;
113			else
114				headerlen = 6;
115			break;
116		case 1: /* System Cooling Capability Structure */
117		case 2: /* Thermal Structure */
118		case 3: /* Input Power Structure */
119			headerlen = 4;
120			break;
121		case 4: /* GPIO Device Structure */
122			headerlen = 4;
123			recordlen = 2;
124			entries   = (ROM32(desc[0]) & 0x01f00000) >> 20;
125			break;
126		case 5: /* Vendor Specific Structure */
127			headerlen = 8;
128			break;
129		case 6: /* Backlight Control Structure */
130			if (mxms_version(mxm) >= 0x0300) {
131				headerlen = 4;
132				recordlen = 8;
133				entries   = (desc[1] & 0xf0) >> 4;
134			} else {
135				headerlen = 8;
136			}
137			break;
138		case 7: /* Fan Control Structure */
139			headerlen = 8;
140			recordlen = 4;
141			entries   = desc[1] & 0x07;
142			break;
143		default:
144			nvkm_debug(subdev, "unknown descriptor type %d\n", type);
145			return false;
146		}
147
148		if (mxm->subdev.debug >= NV_DBG_DEBUG && (exec == NULL)) {
149			static const char * mxms_desc[] = {
150				"ODS", "SCCS", "TS", "IPS",
151				"GSD", "VSS", "BCS", "FCS",
152			};
153			u8 *dump = desc;
154			char data[32], *ptr;
155			int i, j;
156
157			for (j = headerlen - 1, ptr = data; j >= 0; j--)
158				ptr += sprintf(ptr, "%02x", dump[j]);
159			dump += headerlen;
160
161			nvkm_debug(subdev, "%4s: %s\n", mxms_desc[type], data);
162			for (i = 0; i < entries; i++, dump += recordlen) {
163				for (j = recordlen - 1, ptr = data; j >= 0; j--)
164					ptr += sprintf(ptr, "%02x", dump[j]);
165				nvkm_debug(subdev, "      %s\n", data);
166			}
167		}
168
169		if (types & (1 << type)) {
170			if (!exec(mxm, desc, info))
171				return false;
172		}
173
174		desc += headerlen + (entries * recordlen);
175	}
176
177	return true;
178}
179
180void
181mxms_output_device(struct nvkm_mxm *mxm, u8 *pdata, struct mxms_odev *desc)
182{
183	u64 data = ROM32(pdata[0]);
184	if (mxms_version(mxm) >= 0x0300)
185		data |= (u64)ROM16(pdata[4]) << 32;
186
187	desc->outp_type = (data & 0x00000000000000f0ULL) >> 4;
188	desc->ddc_port  = (data & 0x0000000000000f00ULL) >> 8;
189	desc->conn_type = (data & 0x000000000001f000ULL) >> 12;
190	desc->dig_conn  = (data & 0x0000000000780000ULL) >> 19;
191}