LXR linux/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)
  33struct gk104_volt {
  34        struct nvkm_volt base;
  35        struct nvbios_volt bios;
  36};
  37
  38static int
  39gk104_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
  51static int
  52gk104_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
  68static int
  69gk104_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
  84static const struct nvkm_volt_func
  85gk104_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
  97int
  98gk104_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