drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk104.c

   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
  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
  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
  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
  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 }