1 /*
2 * Copyright 2015 Martin Peres
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 #include "priv.h"
25
26 #include <subdev/volt.h>
27 #include <subdev/gpio.h>
28 #include <subdev/bios.h>
29 #include <subdev/bios/volt.h>
30 #include <subdev/fuse.h>
31
32 #define gk104_volt(p) container_of((p), struct gk104_volt, base)
33 struct gk104_volt {
34 struct nvkm_volt base;
35 struct nvbios_volt bios;
36 };
37
38 static int
gk104_volt_get(struct nvkm_volt * base)39 gk104_volt_get(struct nvkm_volt *base)
40 {
41 struct nvbios_volt *bios = &gk104_volt(base)->bios;
42 struct nvkm_device *device = base->subdev.device;
43 u32 div, duty;
44
45 div = nvkm_rd32(device, 0x20340);
46 duty = nvkm_rd32(device, 0x20344);
47
48 return bios->base + bios->pwm_range * duty / div;
49 }
50
51 static int
gk104_volt_set(struct nvkm_volt * base,u32 uv)52 gk104_volt_set(struct nvkm_volt *base, u32 uv)
53 {
54 struct nvbios_volt *bios = &gk104_volt(base)->bios;
55 struct nvkm_device *device = base->subdev.device;
56 u32 div, duty;
57
58 /* the blob uses this crystal frequency, let's use it too. */
59 div = 27648000 / bios->pwm_freq;
60 duty = DIV_ROUND_UP((uv - bios->base) * div, bios->pwm_range);
61
62 nvkm_wr32(device, 0x20340, div);
63 nvkm_wr32(device, 0x20344, 0x80000000 | duty);
64
65 return 0;
66 }
67
68 static int
gk104_volt_speedo_read(struct nvkm_volt * volt)69 gk104_volt_speedo_read(struct nvkm_volt *volt)
70 {
71 struct nvkm_device *device = volt->subdev.device;
72 struct nvkm_fuse *fuse = device->fuse;
73 int ret;
74
75 if (!fuse)
76 return -EINVAL;
77
78 nvkm_wr32(device, 0x122634, 0x0);
79 ret = nvkm_fuse_read(fuse, 0x3a8);
80 nvkm_wr32(device, 0x122634, 0x41);
81 return ret;
82 }
83
84 static const struct nvkm_volt_func
85 gk104_volt_pwm = {
86 .oneinit = gf100_volt_oneinit,
87 .volt_get = gk104_volt_get,
88 .volt_set = gk104_volt_set,
89 .speedo_read = gk104_volt_speedo_read,
90 }, gk104_volt_gpio = {
91 .oneinit = gf100_volt_oneinit,
92 .vid_get = nvkm_voltgpio_get,
93 .vid_set = nvkm_voltgpio_set,
94 .speedo_read = gk104_volt_speedo_read,
95 };
96
97 int
gk104_volt_new(struct nvkm_device * device,int index,struct nvkm_volt ** pvolt)98 gk104_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt)
99 {
100 const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
101 struct dcb_gpio_func gpio;
102 struct nvbios_volt bios;
103 struct gk104_volt *volt;
104 u8 ver, hdr, cnt, len;
105 const char *mode;
106
107 if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
108 return 0;
109
110 if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
111 bios.type == NVBIOS_VOLT_PWM) {
112 volt_func = &gk104_volt_pwm;
113 }
114
115 if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
116 return -ENOMEM;
117 nvkm_volt_ctor(volt_func, device, index, &volt->base);
118 *pvolt = &volt->base;
119 volt->bios = bios;
120
121 /* now that we have a subdev, we can show an error if we found through
122 * the voltage table that we were supposed to use the PWN mode but we
123 * did not find the right GPIO for it.
124 */
125 if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) {
126 nvkm_error(&volt->base.subdev,
127 "Type mismatch between the voltage table type and "
128 "the GPIO table. Fallback to GPIO mode.\n");
129 }
130
131 if (volt_func == &gk104_volt_gpio) {
132 nvkm_voltgpio_init(&volt->base);
133 mode = "GPIO";
134 } else
135 mode = "PWM";
136
137 nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode);
138
139 return 0;
140 }
141