1 /* $NetBSD: nouveau_nvkm_subdev_bios_base.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $ */
2
3 /*
4 * Copyright 2012 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Ben Skeggs
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_base.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
28
29 #include "priv.h"
30
31 #include <subdev/bios.h>
32 #include <subdev/bios/bmp.h>
33 #include <subdev/bios/bit.h>
34 #include <subdev/bios/image.h>
35
36 static bool
nvbios_addr(struct nvkm_bios * bios,u32 * addr,u8 size)37 nvbios_addr(struct nvkm_bios *bios, u32 *addr, u8 size)
38 {
39 u32 p = *addr;
40
41 if (*addr > bios->image0_size && bios->imaged_addr) {
42 *addr -= bios->image0_size;
43 *addr += bios->imaged_addr;
44 }
45
46 if (unlikely(*addr + size >= bios->size)) {
47 nvkm_error(&bios->subdev, "OOB %d %08x %08x\n", size, p, *addr);
48 return false;
49 }
50
51 return true;
52 }
53
54 u8
nvbios_rd08(struct nvkm_bios * bios,u32 addr)55 nvbios_rd08(struct nvkm_bios *bios, u32 addr)
56 {
57 if (likely(nvbios_addr(bios, &addr, 1)))
58 return bios->data[addr];
59 return 0x00;
60 }
61
62 u16
nvbios_rd16(struct nvkm_bios * bios,u32 addr)63 nvbios_rd16(struct nvkm_bios *bios, u32 addr)
64 {
65 if (likely(nvbios_addr(bios, &addr, 2)))
66 return get_unaligned_le16(&bios->data[addr]);
67 return 0x0000;
68 }
69
70 u32
nvbios_rd32(struct nvkm_bios * bios,u32 addr)71 nvbios_rd32(struct nvkm_bios *bios, u32 addr)
72 {
73 if (likely(nvbios_addr(bios, &addr, 4)))
74 return get_unaligned_le32(&bios->data[addr]);
75 return 0x00000000;
76 }
77
78 u8
nvbios_checksum(const u8 * data,int size)79 nvbios_checksum(const u8 *data, int size)
80 {
81 u8 sum = 0;
82 while (size--)
83 sum += *data++;
84 return sum;
85 }
86
87 u16
nvbios_findstr(const u8 * data,int size,const char * str,int len)88 nvbios_findstr(const u8 *data, int size, const char *str, int len)
89 {
90 int i, j;
91
92 for (i = 0; i <= (size - len); i++) {
93 for (j = 0; j < len; j++)
94 if ((char)data[i + j] != str[j])
95 break;
96 if (j == len)
97 return i;
98 }
99
100 return 0;
101 }
102
103 int
nvbios_memcmp(struct nvkm_bios * bios,u32 addr,const char * str,u32 len)104 nvbios_memcmp(struct nvkm_bios *bios, u32 addr, const char *str, u32 len)
105 {
106 unsigned char c1, c2;
107
108 while (len--) {
109 c1 = nvbios_rd08(bios, addr++);
110 c2 = *(str++);
111 if (c1 != c2)
112 return c1 - c2;
113 }
114 return 0;
115 }
116
117 int
nvbios_extend(struct nvkm_bios * bios,u32 length)118 nvbios_extend(struct nvkm_bios *bios, u32 length)
119 {
120 if (bios->size < length) {
121 u8 *prev = bios->data;
122 if (!(bios->data = kmalloc(length, GFP_KERNEL))) {
123 bios->data = prev;
124 return -ENOMEM;
125 }
126 memcpy(bios->data, prev, bios->size);
127 bios->size = length;
128 kfree(prev);
129 return 1;
130 }
131 return 0;
132 }
133
134 static void *
nvkm_bios_dtor(struct nvkm_subdev * subdev)135 nvkm_bios_dtor(struct nvkm_subdev *subdev)
136 {
137 struct nvkm_bios *bios = nvkm_bios(subdev);
138 kfree(bios->data);
139 return bios;
140 }
141
142 static const struct nvkm_subdev_func
143 nvkm_bios = {
144 .dtor = nvkm_bios_dtor,
145 };
146
147 int
nvkm_bios_new(struct nvkm_device * device,int index,struct nvkm_bios ** pbios)148 nvkm_bios_new(struct nvkm_device *device, int index, struct nvkm_bios **pbios)
149 {
150 struct nvkm_bios *bios;
151 struct nvbios_image image;
152 struct bit_entry bit_i;
153 int ret, idx = 0;
154
155 if (!(bios = *pbios = kzalloc(sizeof(*bios), GFP_KERNEL)))
156 return -ENOMEM;
157 nvkm_subdev_ctor(&nvkm_bios, device, index, &bios->subdev);
158
159 ret = nvbios_shadow(bios);
160 if (ret)
161 return ret;
162
163 /* Some tables have weird pointers that need adjustment before
164 * they're dereferenced. I'm not entirely sure why...
165 */
166 if (nvbios_image(bios, idx++, &image)) {
167 bios->image0_size = image.size;
168 while (nvbios_image(bios, idx++, &image)) {
169 if (image.type == 0xe0) {
170 bios->imaged_addr = image.base;
171 break;
172 }
173 }
174 }
175
176 /* detect type of vbios we're dealing with */
177 bios->bmp_offset = nvbios_findstr(bios->data, bios->size,
178 "\xff\x7f""NV\0", 5);
179 if (bios->bmp_offset) {
180 nvkm_debug(&bios->subdev, "BMP version %x.%x\n",
181 bmp_version(bios) >> 8,
182 bmp_version(bios) & 0xff);
183 }
184
185 bios->bit_offset = nvbios_findstr(bios->data, bios->size,
186 "\xff\xb8""BIT", 5);
187 if (bios->bit_offset)
188 nvkm_debug(&bios->subdev, "BIT signature found\n");
189
190 /* determine the vbios version number */
191 if (!bit_entry(bios, 'i', &bit_i) && bit_i.length >= 4) {
192 bios->version.major = nvbios_rd08(bios, bit_i.offset + 3);
193 bios->version.chip = nvbios_rd08(bios, bit_i.offset + 2);
194 bios->version.minor = nvbios_rd08(bios, bit_i.offset + 1);
195 bios->version.micro = nvbios_rd08(bios, bit_i.offset + 0);
196 bios->version.patch = nvbios_rd08(bios, bit_i.offset + 4);
197 } else
198 if (bmp_version(bios)) {
199 bios->version.major = nvbios_rd08(bios, bios->bmp_offset + 13);
200 bios->version.chip = nvbios_rd08(bios, bios->bmp_offset + 12);
201 bios->version.minor = nvbios_rd08(bios, bios->bmp_offset + 11);
202 bios->version.micro = nvbios_rd08(bios, bios->bmp_offset + 10);
203 }
204
205 nvkm_info(&bios->subdev, "version %02x.%02x.%02x.%02x.%02x\n",
206 bios->version.major, bios->version.chip,
207 bios->version.minor, bios->version.micro, bios->version.patch);
208 return 0;
209 }
210