Martin Peres | 1531dbb | 2015-09-09 00:34:33 +0200 | [diff] [blame] | 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 | |
| 31 | #define gk104_volt(p) container_of((p), struct gk104_volt, base) |
| 32 | struct gk104_volt { |
| 33 | struct nvkm_volt base; |
| 34 | struct nvbios_volt bios; |
| 35 | }; |
| 36 | |
| 37 | int |
| 38 | gk104_volt_get(struct nvkm_volt *base) |
| 39 | { |
| 40 | struct nvbios_volt *bios = &gk104_volt(base)->bios; |
| 41 | struct nvkm_device *device = base->subdev.device; |
| 42 | u32 div, duty; |
| 43 | |
| 44 | div = nvkm_rd32(device, 0x20340); |
| 45 | duty = nvkm_rd32(device, 0x20344); |
| 46 | |
| 47 | return bios->base + bios->pwm_range * duty / div; |
| 48 | } |
| 49 | |
| 50 | int |
| 51 | gk104_volt_set(struct nvkm_volt *base, u32 uv) |
| 52 | { |
| 53 | struct nvbios_volt *bios = &gk104_volt(base)->bios; |
| 54 | struct nvkm_device *device = base->subdev.device; |
| 55 | u32 div, duty; |
| 56 | |
| 57 | /* the blob uses this crystal frequency, let's use it too. */ |
| 58 | div = 27648000 / bios->pwm_freq; |
| 59 | duty = (uv - bios->base) * div / bios->pwm_range; |
| 60 | |
| 61 | nvkm_wr32(device, 0x20340, div); |
| 62 | nvkm_wr32(device, 0x20344, 0x8000000 | duty); |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static const struct nvkm_volt_func |
| 68 | gk104_volt_pwm = { |
| 69 | .volt_get = gk104_volt_get, |
| 70 | .volt_set = gk104_volt_set, |
| 71 | }, gk104_volt_gpio = { |
| 72 | .vid_get = nvkm_voltgpio_get, |
| 73 | .vid_set = nvkm_voltgpio_set, |
| 74 | }; |
| 75 | |
| 76 | int |
| 77 | gk104_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt) |
| 78 | { |
| 79 | const struct nvkm_volt_func *volt_func = &gk104_volt_gpio; |
| 80 | struct dcb_gpio_func gpio; |
| 81 | struct nvbios_volt bios; |
| 82 | struct gk104_volt *volt; |
| 83 | u8 ver, hdr, cnt, len; |
| 84 | const char *mode; |
| 85 | |
| 86 | if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios)) |
| 87 | return 0; |
| 88 | |
| 89 | if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) && |
| 90 | bios.type == NVBIOS_VOLT_PWM) { |
| 91 | volt_func = &gk104_volt_pwm; |
| 92 | } |
| 93 | |
| 94 | if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL))) |
| 95 | return -ENOMEM; |
| 96 | nvkm_volt_ctor(volt_func, device, index, &volt->base); |
| 97 | *pvolt = &volt->base; |
| 98 | volt->bios = bios; |
| 99 | |
| 100 | /* now that we have a subdev, we can show an error if we found through |
| 101 | * the voltage table that we were supposed to use the PWN mode but we |
| 102 | * did not find the right GPIO for it. |
| 103 | */ |
| 104 | if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) { |
| 105 | nvkm_error(&volt->base.subdev, |
| 106 | "Type mismatch between the voltage table type and " |
| 107 | "the GPIO table. Fallback to GPIO mode.\n"); |
| 108 | } |
| 109 | |
| 110 | if (volt_func == &gk104_volt_gpio) { |
| 111 | nvkm_voltgpio_init(&volt->base); |
| 112 | mode = "GPIO"; |
| 113 | } else |
| 114 | mode = "PWM"; |
| 115 | |
| 116 | nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode); |
| 117 | |
| 118 | return 0; |
| 119 | } |