1 /* $NetBSD: nouveau_nvkm_subdev_volt_gk104.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $ */
2
3 /*
4 * Copyright 2015 Martin Peres
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: Martin Peres
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_volt_gk104.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $");
28
29 #include "priv.h"
30
31 #include <subdev/volt.h>
32 #include <subdev/gpio.h>
33 #include <subdev/bios.h>
34 #include <subdev/bios/volt.h>
35 #include <subdev/fuse.h>
36
37 #define gk104_volt(p) container_of((p), struct gk104_volt, base)
38 struct gk104_volt {
39 struct nvkm_volt base;
40 struct nvbios_volt bios;
41 };
42
43 static int
gk104_volt_get(struct nvkm_volt * base)44 gk104_volt_get(struct nvkm_volt *base)
45 {
46 struct nvbios_volt *bios = &gk104_volt(base)->bios;
47 struct nvkm_device *device = base->subdev.device;
48 u32 div, duty;
49
50 div = nvkm_rd32(device, 0x20340);
51 duty = nvkm_rd32(device, 0x20344);
52
53 return bios->base + bios->pwm_range * duty / div;
54 }
55
56 static int
gk104_volt_set(struct nvkm_volt * base,u32 uv)57 gk104_volt_set(struct nvkm_volt *base, u32 uv)
58 {
59 struct nvbios_volt *bios = &gk104_volt(base)->bios;
60 struct nvkm_device *device = base->subdev.device;
61 u32 div, duty;
62
63 /* the blob uses this crystal frequency, let's use it too. */
64 div = 27648000 / bios->pwm_freq;
65 duty = DIV_ROUND_UP((uv - bios->base) * div, bios->pwm_range);
66
67 nvkm_wr32(device, 0x20340, div);
68 nvkm_wr32(device, 0x20344, 0x80000000 | duty);
69
70 return 0;
71 }
72
73 static int
gk104_volt_speedo_read(struct nvkm_volt * volt)74 gk104_volt_speedo_read(struct nvkm_volt *volt)
75 {
76 struct nvkm_device *device = volt->subdev.device;
77 struct nvkm_fuse *fuse = device->fuse;
78 int ret;
79
80 if (!fuse)
81 return -EINVAL;
82
83 nvkm_wr32(device, 0x122634, 0x0);
84 ret = nvkm_fuse_read(fuse, 0x3a8);
85 nvkm_wr32(device, 0x122634, 0x41);
86 return ret;
87 }
88
89 static const struct nvkm_volt_func
90 gk104_volt_pwm = {
91 .oneinit = gf100_volt_oneinit,
92 .volt_get = gk104_volt_get,
93 .volt_set = gk104_volt_set,
94 .speedo_read = gk104_volt_speedo_read,
95 }, gk104_volt_gpio = {
96 .oneinit = gf100_volt_oneinit,
97 .vid_get = nvkm_voltgpio_get,
98 .vid_set = nvkm_voltgpio_set,
99 .speedo_read = gk104_volt_speedo_read,
100 };
101
102 int
gk104_volt_new(struct nvkm_device * device,int index,struct nvkm_volt ** pvolt)103 gk104_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt)
104 {
105 const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
106 struct dcb_gpio_func gpio;
107 struct nvbios_volt bios;
108 struct gk104_volt *volt;
109 u8 ver, hdr, cnt, len;
110 const char *mode;
111
112 if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
113 return 0;
114
115 if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
116 bios.type == NVBIOS_VOLT_PWM) {
117 volt_func = &gk104_volt_pwm;
118 }
119
120 if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
121 return -ENOMEM;
122 nvkm_volt_ctor(volt_func, device, index, &volt->base);
123 *pvolt = &volt->base;
124 volt->bios = bios;
125
126 /* now that we have a subdev, we can show an error if we found through
127 * the voltage table that we were supposed to use the PWN mode but we
128 * did not find the right GPIO for it.
129 */
130 if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) {
131 nvkm_error(&volt->base.subdev,
132 "Type mismatch between the voltage table type and "
133 "the GPIO table. Fallback to GPIO mode.\n");
134 }
135
136 if (volt_func == &gk104_volt_gpio) {
137 nvkm_voltgpio_init(&volt->base);
138 mode = "GPIO";
139 } else
140 mode = "PWM";
141
142 nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode);
143
144 return 0;
145 }
146