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
28static u16
29dcb_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
45u16
46dcb_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
63u16
64dcb_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}
75