cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

gk104.c (4132B)

      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, enum nvkm_subdev_type type, int inst,
     99	       struct nvkm_volt **pvolt)
    100{
    101	const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
    102	struct dcb_gpio_func gpio;
    103	struct nvbios_volt bios;
    104	struct gk104_volt *volt;
    105	u8 ver, hdr, cnt, len;
    106	const char *mode;
    107
    108	if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
    109		return 0;
    110
    111	if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
    112	    bios.type == NVBIOS_VOLT_PWM) {
    113		volt_func = &gk104_volt_pwm;
    114	}
    115
    116	if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
    117		return -ENOMEM;
    118	nvkm_volt_ctor(volt_func, device, type, inst, &volt->base);
    119	*pvolt = &volt->base;
    120	volt->bios = bios;
    121
    122	/* now that we have a subdev, we can show an error if we found through
    123	 * the voltage table that we were supposed to use the PWN mode but we
    124	 * did not find the right GPIO for it.
    125	 */
    126	if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) {
    127		nvkm_error(&volt->base.subdev,
    128			   "Type mismatch between the voltage table type and "
    129			   "the GPIO table. Fallback to GPIO mode.\n");
    130	}
    131
    132	if (volt_func == &gk104_volt_gpio) {
    133		nvkm_voltgpio_init(&volt->base);
    134		mode = "GPIO";
    135	} else
    136		mode = "PWM";
    137
    138	nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode);
    139
    140	return 0;
    141}