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 }
75