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 <subdev/bios.h>
25 #include <subdev/bios/gpio.h>
26 #include <subdev/bios/xpio.h>
27
28 static u16
29 dcb_xpiod_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
30 {
31 u16 data = dcb_gpio_table(bios, ver, hdr, cnt, len);
32 if (data && *ver >= 0x40 && *hdr >= 0x06) {
33 u16 xpio = nvbios_rd16(bios, data + 0x04);
34 if (xpio) {
35 *ver = nvbios_rd08(bios, data + 0x00);
36 *hdr = nvbios_rd08(bios, data + 0x01);
37 *cnt = nvbios_rd08(bios, data + 0x02);
38 *len = nvbios_rd08(bios, data + 0x03);
39 return xpio;
40 }
41 }
42 return 0x0000;
43 }
44
45 u16
46 dcb_xpio_table(struct nvkm_bios *bios, u8 idx,
47 u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
48 {
49 u16 data = dcb_xpiod_table(bios, ver, hdr, cnt, len);
50 if (data && idx < *cnt) {
51 u16 xpio = nvbios_rd16(bios, data + *hdr + (idx * *len));
52 if (xpio) {
53 *ver = nvbios_rd08(bios, data + 0x00);
54 *hdr = nvbios_rd08(bios, data + 0x01);
55 *cnt = nvbios_rd08(bios, data + 0x02);
56 *len = nvbios_rd08(bios, data + 0x03);
57 return xpio;
58 }
59 }
60 return 0x0000;
61 }
62
63 u16
64 dcb_xpio_parse(struct nvkm_bios *bios, u8 idx,
65 u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_xpio *info)
66 {
67 u16 data = dcb_xpio_table(bios, idx, ver, hdr, cnt, len);
68 if (data && *len >= 6) {
69 info->type = nvbios_rd08(bios, data + 0x04);
70 info->addr = nvbios_rd08(bios, data + 0x05);
71 info->flags = nvbios_rd08(bios, data + 0x06);
72 }
73 return 0x0000;
74 }