subdev/volt/gf100.c

0001 /*
0002  * Copyright 2016 Karol Herbst
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: Karol Herbst
0023  */
0024 #include "priv.h"
0025
0026 #include <subdev/fuse.h>
0027
0028 static int
0029 gf100_volt_speedo_read(struct nvkm_volt *volt)
0030 {
0031     struct nvkm_device *device = volt->subdev.device;
0032     struct nvkm_fuse *fuse = device->fuse;
0033
0034     if (!fuse)
0035         return -EINVAL;
0036
0037     return nvkm_fuse_read(fuse, 0x1cc);
0038 }
0039
0040 int
0041 gf100_volt_oneinit(struct nvkm_volt *volt)
0042 {
0043     struct nvkm_subdev *subdev = &volt->subdev;
0044     if (volt->speedo <= 0)
0045         nvkm_error(subdev, "couldn't find speedo value, volting not "
0046                "possible\n");
0047     return 0;
0048 }
0049
0050 static const struct nvkm_volt_func
0051 gf100_volt = {
0052     .oneinit = gf100_volt_oneinit,
0053     .vid_get = nvkm_voltgpio_get,
0054     .vid_set = nvkm_voltgpio_set,
0055     .speedo_read = gf100_volt_speedo_read,
0056 };
0057
0058 int
0059 gf100_volt_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
0060            struct nvkm_volt **pvolt)
0061 {
0062     struct nvkm_volt *volt;
0063     int ret;
0064
0065     ret = nvkm_volt_new_(&gf100_volt, device, type, inst, &volt);
0066     *pvolt = volt;
0067     if (ret)
0068         return ret;
0069
0070     return nvkm_voltgpio_init(volt);
0071 }