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,enum nvkm_subdev_type type,int inst,struct nvkm_volt ** pvolt)98 gk104_volt_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
99 	       struct nvkm_volt **pvolt)
100 {
101 	const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
102 	struct dcb_gpio_func gpio;
103 	struct nvbios_volt bios;
104 	struct gk104_volt *volt;
105 	u8 ver, hdr, cnt, len;
106 	const char *mode;
107 
108 	if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
109 		return 0;
110 
111 	if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
112 	    bios.type == NVBIOS_VOLT_PWM) {
113 		volt_func = &gk104_volt_pwm;
114 	}
115 
116 	if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
117 		return -ENOMEM;
118 	nvkm_volt_ctor(volt_func, device, type, inst, &volt->base);
119 	*pvolt = &volt->base;
120 	volt->bios = bios;
121 
122 	/* now that we have a subdev, we can show an error if we found through
123 	 * the voltage table that we were supposed to use the PWN mode but we
124 	 * did not find the right GPIO for it.
125 	 */
126 	if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) {
127 		nvkm_error(&volt->base.subdev,
128 			   "Type mismatch between the voltage table type and "
129 			   "the GPIO table. Fallback to GPIO mode.\n");
130 	}
131 
132 	if (volt_func == &gk104_volt_gpio) {
133 		nvkm_voltgpio_init(&volt->base);
134 		mode = "GPIO";
135 	} else
136 		mode = "PWM";
137 
138 	nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode);
139 
140 	return 0;
141 }
142