subdev/volt/gk104.c

0001 /*
0002  * Copyright 2015 Martin Peres
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Martin Peres
0023  */
0024 #include "priv.h"
0025
0026 #include <subdev/volt.h>
0027 #include <subdev/gpio.h>
0028 #include <subdev/bios.h>
0029 #include <subdev/bios/volt.h>
0030 #include <subdev/fuse.h>
0031
0032 #define gk104_volt(p) container_of((p), struct gk104_volt, base)
0033 struct gk104_volt {
0034     struct nvkm_volt base;
0035     struct nvbios_volt bios;
0036 };
0037
0038 static int
0039 gk104_volt_get(struct nvkm_volt *base)
0040 {
0041     struct nvbios_volt *bios = &gk104_volt(base)->bios;
0042     struct nvkm_device *device = base->subdev.device;
0043     u32 div, duty;
0044
0045     div  = nvkm_rd32(device, 0x20340);
0046     duty = nvkm_rd32(device, 0x20344);
0047
0048     return bios->base + bios->pwm_range * duty / div;
0049 }
0050
0051 static int
0052 gk104_volt_set(struct nvkm_volt *base, u32 uv)
0053 {
0054     struct nvbios_volt *bios = &gk104_volt(base)->bios;
0055     struct nvkm_device *device = base->subdev.device;
0056     u32 div, duty;
0057
0058     /* the blob uses this crystal frequency, let's use it too. */
0059     div = 27648000 / bios->pwm_freq;
0060     duty = DIV_ROUND_UP((uv - bios->base) * div, bios->pwm_range);
0061
0062     nvkm_wr32(device, 0x20340, div);
0063     nvkm_wr32(device, 0x20344, 0x80000000 | duty);
0064
0065     return 0;
0066 }
0067
0068 static int
0069 gk104_volt_speedo_read(struct nvkm_volt *volt)
0070 {
0071     struct nvkm_device *device = volt->subdev.device;
0072     struct nvkm_fuse *fuse = device->fuse;
0073     int ret;
0074
0075     if (!fuse)
0076         return -EINVAL;
0077
0078     nvkm_wr32(device, 0x122634, 0x0);
0079     ret = nvkm_fuse_read(fuse, 0x3a8);
0080     nvkm_wr32(device, 0x122634, 0x41);
0081     return ret;
0082 }
0083
0084 static const struct nvkm_volt_func
0085 gk104_volt_pwm = {
0086     .oneinit = gf100_volt_oneinit,
0087     .volt_get = gk104_volt_get,
0088     .volt_set = gk104_volt_set,
0089     .speedo_read = gk104_volt_speedo_read,
0090 }, gk104_volt_gpio = {
0091     .oneinit = gf100_volt_oneinit,
0092     .vid_get = nvkm_voltgpio_get,
0093     .vid_set = nvkm_voltgpio_set,
0094     .speedo_read = gk104_volt_speedo_read,
0095 };
0096
0097 int
0098 gk104_volt_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
0099            struct nvkm_volt **pvolt)
0100 {
0101     const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
0102     struct dcb_gpio_func gpio;
0103     struct nvbios_volt bios;
0104     struct gk104_volt *volt;
0105     u8 ver, hdr, cnt, len;
0106     const char *mode;
0107
0108     if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
0109         return 0;
0110
0111     if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
0112         bios.type == NVBIOS_VOLT_PWM) {
0113         volt_func = &gk104_volt_pwm;
0114     }
0115
0116     if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
0117         return -ENOMEM;
0118     nvkm_volt_ctor(volt_func, device, type, inst, &volt->base);
0119     *pvolt = &volt->base;
0120     volt->bios = bios;
0121
0122     /* now that we have a subdev, we can show an error if we found through
0123      * the voltage table that we were supposed to use the PWN mode but we
0124      * did not find the right GPIO for it.
0125      */
0126     if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) {
0127         nvkm_error(&volt->base.subdev,
0128                "Type mismatch between the voltage table type and "
0129                "the GPIO table. Fallback to GPIO mode.\n");
0130     }
0131
0132     if (volt_func == &gk104_volt_gpio) {
0133         nvkm_voltgpio_init(&volt->base);
0134         mode = "GPIO";
0135     } else
0136         mode = "PWM";
0137
0138     nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode);
0139
0140     return 0;
0141 }