| /* |
| * Copyright 2015 Martin Peres |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: Martin Peres |
| */ |
| #include "priv.h" |
| |
| #include <subdev/volt.h> |
| #include <subdev/gpio.h> |
| #include <subdev/bios.h> |
| #include <subdev/bios/volt.h> |
| |
| #define gk104_volt(p) container_of((p), struct gk104_volt, base) |
| struct gk104_volt { |
| struct nvkm_volt base; |
| struct nvbios_volt bios; |
| }; |
| |
| int |
| gk104_volt_get(struct nvkm_volt *base) |
| { |
| struct nvbios_volt *bios = &gk104_volt(base)->bios; |
| struct nvkm_device *device = base->subdev.device; |
| u32 div, duty; |
| |
| div = nvkm_rd32(device, 0x20340); |
| duty = nvkm_rd32(device, 0x20344); |
| |
| return bios->base + bios->pwm_range * duty / div; |
| } |
| |
| int |
| gk104_volt_set(struct nvkm_volt *base, u32 uv) |
| { |
| struct nvbios_volt *bios = &gk104_volt(base)->bios; |
| struct nvkm_device *device = base->subdev.device; |
| u32 div, duty; |
| |
| /* the blob uses this crystal frequency, let's use it too. */ |
| div = 27648000 / bios->pwm_freq; |
| duty = (uv - bios->base) * div / bios->pwm_range; |
| |
| nvkm_wr32(device, 0x20340, div); |
| nvkm_wr32(device, 0x20344, 0x8000000 | duty); |
| |
| return 0; |
| } |
| |
| static const struct nvkm_volt_func |
| gk104_volt_pwm = { |
| .volt_get = gk104_volt_get, |
| .volt_set = gk104_volt_set, |
| }, gk104_volt_gpio = { |
| .vid_get = nvkm_voltgpio_get, |
| .vid_set = nvkm_voltgpio_set, |
| }; |
| |
| int |
| gk104_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt) |
| { |
| const struct nvkm_volt_func *volt_func = &gk104_volt_gpio; |
| struct dcb_gpio_func gpio; |
| struct nvbios_volt bios; |
| struct gk104_volt *volt; |
| u8 ver, hdr, cnt, len; |
| const char *mode; |
| |
| if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios)) |
| return 0; |
| |
| if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) && |
| bios.type == NVBIOS_VOLT_PWM) { |
| volt_func = &gk104_volt_pwm; |
| } |
| |
| if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL))) |
| return -ENOMEM; |
| nvkm_volt_ctor(volt_func, device, index, &volt->base); |
| *pvolt = &volt->base; |
| volt->bios = bios; |
| |
| /* now that we have a subdev, we can show an error if we found through |
| * the voltage table that we were supposed to use the PWN mode but we |
| * did not find the right GPIO for it. |
| */ |
| if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) { |
| nvkm_error(&volt->base.subdev, |
| "Type mismatch between the voltage table type and " |
| "the GPIO table. Fallback to GPIO mode.\n"); |
| } |
| |
| if (volt_func == &gk104_volt_gpio) { |
| nvkm_voltgpio_init(&volt->base); |
| mode = "GPIO"; |
| } else |
| mode = "PWM"; |
| |
| nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode); |
| |
| return 0; |
| } |