1/*	$NetBSD: nouveau_nvkm_subdev_bios_xpio.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_xpio.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
28
29#include <subdev/bios.h>
30#include <subdev/bios/gpio.h>
31#include <subdev/bios/xpio.h>
32
33static u16
34dcb_xpiod_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
35{
36	u16 data = dcb_gpio_table(bios, ver, hdr, cnt, len);
37	if (data && *ver >= 0x40 && *hdr >= 0x06) {
38		u16 xpio = nvbios_rd16(bios, data + 0x04);
39		if (xpio) {
40			*ver = nvbios_rd08(bios, data + 0x00);
41			*hdr = nvbios_rd08(bios, data + 0x01);
42			*cnt = nvbios_rd08(bios, data + 0x02);
43			*len = nvbios_rd08(bios, data + 0x03);
44			return xpio;
45		}
46	}
47	return 0x0000;
48}
49
50u16
51dcb_xpio_table(struct nvkm_bios *bios, u8 idx,
52	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
53{
54	u16 data = dcb_xpiod_table(bios, ver, hdr, cnt, len);
55	if (data && idx < *cnt) {
56		u16 xpio = nvbios_rd16(bios, data + *hdr + (idx * *len));
57		if (xpio) {
58			*ver = nvbios_rd08(bios, data + 0x00);
59			*hdr = nvbios_rd08(bios, data + 0x01);
60			*cnt = nvbios_rd08(bios, data + 0x02);
61			*len = nvbios_rd08(bios, data + 0x03);
62			return xpio;
63		}
64	}
65	return 0x0000;
66}
67
68u16
69dcb_xpio_parse(struct nvkm_bios *bios, u8 idx,
70	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_xpio *info)
71{
72	u16 data = dcb_xpio_table(bios, idx, ver, hdr, cnt, len);
73	if (data && *len >= 6) {
74		info->type = nvbios_rd08(bios, data + 0x04);
75		info->addr = nvbios_rd08(bios, data + 0x05);
76		info->flags = nvbios_rd08(bios, data + 0x06);
77	}
78	return 0x0000;
79}
80