1 | /* $NetBSD: nouveau_subdev_volt_gpio.c,v 1.1.1.1 2014/08/06 12:36:32 riastradh Exp $ */ |
2 | |
3 | /* |
4 | * Copyright 2013 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 | |
27 | #include <sys/cdefs.h> |
28 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_volt_gpio.c,v 1.1.1.1 2014/08/06 12:36:32 riastradh Exp $" ); |
29 | |
30 | #include <subdev/volt.h> |
31 | #include <subdev/gpio.h> |
32 | #include <subdev/bios/gpio.h> |
33 | |
34 | static const u8 tags[] = { |
35 | DCB_GPIO_VID0, DCB_GPIO_VID1, DCB_GPIO_VID2, DCB_GPIO_VID3, |
36 | DCB_GPIO_VID4, DCB_GPIO_VID5, DCB_GPIO_VID6, DCB_GPIO_VID7, |
37 | }; |
38 | |
39 | int |
40 | nouveau_voltgpio_get(struct nouveau_volt *volt) |
41 | { |
42 | struct nouveau_gpio *gpio = nouveau_gpio(volt); |
43 | u8 vid = 0; |
44 | int i; |
45 | |
46 | for (i = 0; i < ARRAY_SIZE(tags); i++) { |
47 | if (volt->vid_mask & (1 << i)) { |
48 | int ret = gpio->get(gpio, 0, tags[i], 0xff); |
49 | if (ret < 0) |
50 | return ret; |
51 | vid |= ret << i; |
52 | } |
53 | } |
54 | |
55 | return vid; |
56 | } |
57 | |
58 | int |
59 | nouveau_voltgpio_set(struct nouveau_volt *volt, u8 vid) |
60 | { |
61 | struct nouveau_gpio *gpio = nouveau_gpio(volt); |
62 | int i; |
63 | |
64 | for (i = 0; i < ARRAY_SIZE(tags); i++, vid >>= 1) { |
65 | if (volt->vid_mask & (1 << i)) { |
66 | int ret = gpio->set(gpio, 0, tags[i], 0xff, vid & 1); |
67 | if (ret < 0) |
68 | return ret; |
69 | } |
70 | } |
71 | |
72 | return 0; |
73 | } |
74 | |
75 | int |
76 | nouveau_voltgpio_init(struct nouveau_volt *volt) |
77 | { |
78 | struct nouveau_gpio *gpio = nouveau_gpio(volt); |
79 | struct dcb_gpio_func func; |
80 | int i; |
81 | |
82 | /* check we have gpio function info for each vid bit. on some |
83 | * boards (ie. nvs295) the vid mask has more bits than there |
84 | * are valid gpio functions... from traces, nvidia appear to |
85 | * just touch the existing ones, so let's mask off the invalid |
86 | * bits and continue with life |
87 | */ |
88 | for (i = 0; i < ARRAY_SIZE(tags); i++) { |
89 | if (volt->vid_mask & (1 << i)) { |
90 | int ret = gpio->find(gpio, 0, tags[i], 0xff, &func); |
91 | if (ret) { |
92 | if (ret != -ENOENT) |
93 | return ret; |
94 | nv_debug(volt, "VID bit %d has no GPIO\n" , i); |
95 | volt->vid_mask &= ~(1 << i); |
96 | } |
97 | } |
98 | } |
99 | |
100 | return 0; |
101 | } |
102 | |