1/* $NetBSD: nouveau_nvkm_subdev_volt_gk104.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $ */ 2 3/* 4 * Copyright 2015 Martin Peres 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: Martin Peres 25 */ 26#include <sys/cdefs.h> 27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_volt_gk104.c,v 1.4 2021/12/18 23:45:42 riastradh Exp $"); 28 29#include "priv.h" 30 31#include <subdev/volt.h> 32#include <subdev/gpio.h> 33#include <subdev/bios.h> 34#include <subdev/bios/volt.h> 35#include <subdev/fuse.h> 36 37#define gk104_volt(p) container_of((p), struct gk104_volt, base) 38struct gk104_volt { 39 struct nvkm_volt base; 40 struct nvbios_volt bios; 41}; 42 43static int 44gk104_volt_get(struct nvkm_volt *base) 45{ 46 struct nvbios_volt *bios = &gk104_volt(base)->bios; 47 struct nvkm_device *device = base->subdev.device; 48 u32 div, duty; 49 50 div = nvkm_rd32(device, 0x20340); 51 duty = nvkm_rd32(device, 0x20344); 52 53 return bios->base + bios->pwm_range * duty / div; 54} 55 56static int 57gk104_volt_set(struct nvkm_volt *base, u32 uv) 58{ 59 struct nvbios_volt *bios = &gk104_volt(base)->bios; 60 struct nvkm_device *device = base->subdev.device; 61 u32 div, duty; 62 63 /* the blob uses this crystal frequency, let's use it too. */ 64 div = 27648000 / bios->pwm_freq; 65 duty = DIV_ROUND_UP((uv - bios->base) * div, bios->pwm_range); 66 67 nvkm_wr32(device, 0x20340, div); 68 nvkm_wr32(device, 0x20344, 0x80000000 | duty); 69 70 return 0; 71} 72 73static int 74gk104_volt_speedo_read(struct nvkm_volt *volt) 75{ 76 struct nvkm_device *device = volt->subdev.device; 77 struct nvkm_fuse *fuse = device->fuse; 78 int ret; 79 80 if (!fuse) 81 return -EINVAL; 82 83 nvkm_wr32(device, 0x122634, 0x0); 84 ret = nvkm_fuse_read(fuse, 0x3a8); 85 nvkm_wr32(device, 0x122634, 0x41); 86 return ret; 87} 88 89static const struct nvkm_volt_func 90gk104_volt_pwm = { 91 .oneinit = gf100_volt_oneinit, 92 .volt_get = gk104_volt_get, 93 .volt_set = gk104_volt_set, 94 .speedo_read = gk104_volt_speedo_read, 95}, gk104_volt_gpio = { 96 .oneinit = gf100_volt_oneinit, 97 .vid_get = nvkm_voltgpio_get, 98 .vid_set = nvkm_voltgpio_set, 99 .speedo_read = gk104_volt_speedo_read, 100}; 101 102int 103gk104_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt) 104{ 105 const struct nvkm_volt_func *volt_func = &gk104_volt_gpio; 106 struct dcb_gpio_func gpio; 107 struct nvbios_volt bios; 108 struct gk104_volt *volt; 109 u8 ver, hdr, cnt, len; 110 const char *mode; 111 112 if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios)) 113 return 0; 114 115 if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) && 116 bios.type == NVBIOS_VOLT_PWM) { 117 volt_func = &gk104_volt_pwm; 118 } 119 120 if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL))) 121 return -ENOMEM; 122 nvkm_volt_ctor(volt_func, device, index, &volt->base); 123 *pvolt = &volt->base; 124 volt->bios = bios; 125 126 /* now that we have a subdev, we can show an error if we found through 127 * the voltage table that we were supposed to use the PWN mode but we 128 * did not find the right GPIO for it. 129 */ 130 if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) { 131 nvkm_error(&volt->base.subdev, 132 "Type mismatch between the voltage table type and " 133 "the GPIO table. Fallback to GPIO mode.\n"); 134 } 135 136 if (volt_func == &gk104_volt_gpio) { 137 nvkm_voltgpio_init(&volt->base); 138 mode = "GPIO"; 139 } else 140 mode = "PWM"; 141 142 nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode); 143 144 return 0; 145} 146