1 /*
2 * Copyright 2011 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 #include <core/option.h>
27 #include <subdev/bios.h>
28 #include <subdev/bios/mxm.h>
29 #include <subdev/i2c.h>
30
31 static bool
mxm_shadow_rom_fetch(struct nvkm_i2c_bus * bus,u8 addr,u8 offset,u8 size,u8 * data)32 mxm_shadow_rom_fetch(struct nvkm_i2c_bus *bus, u8 addr,
33 u8 offset, u8 size, u8 *data)
34 {
35 struct i2c_msg msgs[] = {
36 { .addr = addr, .flags = 0, .len = 1, .buf = &offset },
37 { .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },
38 };
39
40 return i2c_transfer(&bus->i2c, msgs, 2) == 2;
41 }
42
43 static bool
mxm_shadow_rom(struct nvkm_mxm * mxm,u8 version)44 mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version)
45 {
46 struct nvkm_device *device = mxm->subdev.device;
47 struct nvkm_bios *bios = device->bios;
48 struct nvkm_i2c *i2c = device->i2c;
49 struct nvkm_i2c_bus *bus = NULL;
50 u8 i2cidx, mxms[6], addr, size;
51
52 i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f;
53 if (i2cidx < 0x0f)
54 bus = nvkm_i2c_bus_find(i2c, i2cidx);
55 if (!bus)
56 return false;
57
58 addr = 0x54;
59 if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms)) {
60 addr = 0x56;
61 if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms))
62 return false;
63 }
64
65 mxm->mxms = mxms;
66 size = mxms_headerlen(mxm) + mxms_structlen(mxm);
67 mxm->mxms = kmalloc(size, GFP_KERNEL);
68
69 if (mxm->mxms &&
70 mxm_shadow_rom_fetch(bus, addr, 0, size, mxm->mxms))
71 return true;
72
73 kfree(mxm->mxms);
74 mxm->mxms = NULL;
75 return false;
76 }
77
78 #if defined(CONFIG_ACPI)
79 static bool
mxm_shadow_dsm(struct nvkm_mxm * mxm,u8 version)80 mxm_shadow_dsm(struct nvkm_mxm *mxm, u8 version)
81 {
82 struct nvkm_subdev *subdev = &mxm->subdev;
83 struct nvkm_device *device = subdev->device;
84 static guid_t muid =
85 GUID_INIT(0x4004A400, 0x917D, 0x4CF2,
86 0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65);
87 u32 mxms_args[] = { 0x00000000 };
88 union acpi_object argv4 = {
89 .buffer.type = ACPI_TYPE_BUFFER,
90 .buffer.length = sizeof(mxms_args),
91 .buffer.pointer = (char *)mxms_args,
92 };
93 union acpi_object *obj;
94 acpi_handle handle;
95 int rev;
96
97 handle = ACPI_HANDLE(device->dev);
98 if (!handle)
99 return false;
100
101 /*
102 * spec says this can be zero to mean "highest revision", but
103 * of course there's at least one bios out there which fails
104 * unless you pass in exactly the version it supports..
105 */
106 rev = (version & 0xf0) << 4 | (version & 0x0f);
107 obj = acpi_evaluate_dsm(handle, &muid, rev, 0x00000010, &argv4);
108 if (!obj) {
109 nvkm_debug(subdev, "DSM MXMS failed\n");
110 return false;
111 }
112
113 if (obj->type == ACPI_TYPE_BUFFER) {
114 mxm->mxms = kmemdup(obj->buffer.pointer,
115 obj->buffer.length, GFP_KERNEL);
116 } else if (obj->type == ACPI_TYPE_INTEGER) {
117 nvkm_debug(subdev, "DSM MXMS returned 0x%llx\n",
118 obj->integer.value);
119 }
120
121 ACPI_FREE(obj);
122 return mxm->mxms != NULL;
123 }
124 #endif
125
126 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
127
128 #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
129
130 static u8
wmi_wmmx_mxmi(struct nvkm_mxm * mxm,u8 version)131 wmi_wmmx_mxmi(struct nvkm_mxm *mxm, u8 version)
132 {
133 struct nvkm_subdev *subdev = &mxm->subdev;
134 u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 };
135 struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args };
136 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
137 union acpi_object *obj;
138 acpi_status status;
139
140 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
141 if (ACPI_FAILURE(status)) {
142 nvkm_debug(subdev, "WMMX MXMI returned %d\n", status);
143 return 0x00;
144 }
145
146 obj = retn.pointer;
147 if (obj->type == ACPI_TYPE_INTEGER) {
148 version = obj->integer.value;
149 nvkm_debug(subdev, "WMMX MXMI version %d.%d\n",
150 (version >> 4), version & 0x0f);
151 } else {
152 version = 0;
153 nvkm_debug(subdev, "WMMX MXMI returned non-integer\n");
154 }
155
156 kfree(obj);
157 return version;
158 }
159
160 static bool
mxm_shadow_wmi(struct nvkm_mxm * mxm,u8 version)161 mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version)
162 {
163 struct nvkm_subdev *subdev = &mxm->subdev;
164 u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 };
165 struct acpi_buffer args = { sizeof(mxms_args), mxms_args };
166 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
167 union acpi_object *obj;
168 acpi_status status;
169
170 if (!wmi_has_guid(WMI_WMMX_GUID)) {
171 nvkm_debug(subdev, "WMMX GUID not found\n");
172 return false;
173 }
174
175 mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00);
176 if (!mxms_args[1])
177 mxms_args[1] = wmi_wmmx_mxmi(mxm, version);
178 if (!mxms_args[1])
179 return false;
180
181 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
182 if (ACPI_FAILURE(status)) {
183 nvkm_debug(subdev, "WMMX MXMS returned %d\n", status);
184 return false;
185 }
186
187 obj = retn.pointer;
188 if (obj->type == ACPI_TYPE_BUFFER) {
189 mxm->mxms = kmemdup(obj->buffer.pointer,
190 obj->buffer.length, GFP_KERNEL);
191 }
192
193 kfree(obj);
194 return mxm->mxms != NULL;
195 }
196 #endif
197
198 static struct mxm_shadow_h {
199 const char *name;
200 bool (*exec)(struct nvkm_mxm *, u8 version);
201 } _mxm_shadow[] = {
202 { "ROM", mxm_shadow_rom },
203 #if defined(CONFIG_ACPI)
204 { "DSM", mxm_shadow_dsm },
205 #endif
206 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
207 { "WMI", mxm_shadow_wmi },
208 #endif
209 {}
210 };
211
212 static int
mxm_shadow(struct nvkm_mxm * mxm,u8 version)213 mxm_shadow(struct nvkm_mxm *mxm, u8 version)
214 {
215 struct mxm_shadow_h *shadow = _mxm_shadow;
216 do {
217 nvkm_debug(&mxm->subdev, "checking %s\n", shadow->name);
218 if (shadow->exec(mxm, version)) {
219 if (mxms_valid(mxm))
220 return 0;
221 kfree(mxm->mxms);
222 mxm->mxms = NULL;
223 }
224 } while ((++shadow)->name);
225 return -ENOENT;
226 }
227
228 static const struct nvkm_subdev_func
229 nvkm_mxm = {
230 };
231
232 int
nvkm_mxm_new_(struct nvkm_device * device,enum nvkm_subdev_type type,int inst,struct nvkm_mxm ** pmxm)233 nvkm_mxm_new_(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
234 struct nvkm_mxm **pmxm)
235 {
236 struct nvkm_bios *bios = device->bios;
237 struct nvkm_mxm *mxm;
238 u8 ver, len;
239 u16 data;
240
241 if (!(mxm = *pmxm = kzalloc(sizeof(*mxm), GFP_KERNEL)))
242 return -ENOMEM;
243
244 nvkm_subdev_ctor(&nvkm_mxm, device, type, inst, &mxm->subdev);
245
246 data = mxm_table(bios, &ver, &len);
247 if (!data || !(ver = nvbios_rd08(bios, data))) {
248 nvkm_debug(&mxm->subdev, "no VBIOS data, nothing to do\n");
249 return 0;
250 }
251
252 nvkm_info(&mxm->subdev, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);
253 nvkm_debug(&mxm->subdev, "module flags: %02x\n",
254 nvbios_rd08(bios, data + 0x01));
255 nvkm_debug(&mxm->subdev, "config flags: %02x\n",
256 nvbios_rd08(bios, data + 0x02));
257
258 if (mxm_shadow(mxm, ver)) {
259 nvkm_warn(&mxm->subdev, "failed to locate valid SIS\n");
260 #if 0
261 /* we should, perhaps, fall back to some kind of limited
262 * mode here if the x86 vbios hasn't already done the
263 * work for us (so we prevent loading with completely
264 * whacked vbios tables).
265 */
266 return -EINVAL;
267 #else
268 return 0;
269 #endif
270 }
271
272 nvkm_debug(&mxm->subdev, "MXMS Version %d.%d\n",
273 mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff);
274 mxms_foreach(mxm, 0, NULL, NULL);
275
276 if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true))
277 mxm->action |= MXM_SANITISE_DCB;
278 return 0;
279 }
280