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1 /*
2  * Copyright 2012 Nouveau Community
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: Martin Peres
23  */
24 
25 #include <subdev/bios.h>
26 #include <subdev/bios/bit.h>
27 #include <subdev/bios/perf.h>
28 
29 static u16
perf_table(struct nouveau_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)30 perf_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
31 {
32 	struct bit_entry bit_P;
33 	u16 perf = 0x0000;
34 
35 	if (!bit_entry(bios, 'P', &bit_P)) {
36 		if (bit_P.version <= 2) {
37 			perf = nv_ro16(bios, bit_P.offset + 0);
38 			if (perf) {
39 				*ver = nv_ro08(bios, perf + 0);
40 				*hdr = nv_ro08(bios, perf + 1);
41 			}
42 		} else
43 			nv_error(bios, "unknown offset for perf in BIT P %d\n",
44 				bit_P.version);
45 	}
46 
47 	if (bios->bmp_offset) {
48 		if (nv_ro08(bios, bios->bmp_offset + 6) >= 0x25) {
49 			perf = nv_ro16(bios, bios->bmp_offset + 0x94);
50 			if (perf) {
51 				*hdr = nv_ro08(bios, perf + 0);
52 				*ver = nv_ro08(bios, perf + 1);
53 			}
54 		}
55 	}
56 
57 	return perf;
58 }
59 
60 int
nvbios_perf_fan_parse(struct nouveau_bios * bios,struct nvbios_perf_fan * fan)61 nvbios_perf_fan_parse(struct nouveau_bios *bios,
62 		      struct nvbios_perf_fan *fan)
63 {
64 	u8 ver = 0, hdr = 0, cnt = 0, len = 0;
65 	u16 perf = perf_table(bios, &ver, &hdr, &cnt, &len);
66 	if (!perf)
67 		return -ENODEV;
68 
69 	if (ver >= 0x20 && ver < 0x40 && hdr > 6)
70 		fan->pwm_divisor = nv_ro16(bios, perf + 6);
71 	else
72 		fan->pwm_divisor = 0;
73 
74 	return 0;
75 }
76