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      1 /*	$NetBSD: nouveau_nvkm_subdev_volt_gf100.c,v 1.2 2021/12/18 23:45:42 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2016 Karol Herbst
      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: Karol Herbst
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_volt_gf100.c,v 1.2 2021/12/18 23:45:42 riastradh Exp $");
     28 
     29 #include "priv.h"
     30 
     31 #include <subdev/fuse.h>
     32 
     33 static int
     34 gf100_volt_speedo_read(struct nvkm_volt *volt)
     35 {
     36 	struct nvkm_device *device = volt->subdev.device;
     37 	struct nvkm_fuse *fuse = device->fuse;
     38 
     39 	if (!fuse)
     40 		return -EINVAL;
     41 
     42 	return nvkm_fuse_read(fuse, 0x1cc);
     43 }
     44 
     45 int
     46 gf100_volt_oneinit(struct nvkm_volt *volt)
     47 {
     48 	struct nvkm_subdev *subdev = &volt->subdev;
     49 	if (volt->speedo <= 0)
     50 		nvkm_error(subdev, "couldn't find speedo value, volting not "
     51 			   "possible\n");
     52 	return 0;
     53 }
     54 
     55 static const struct nvkm_volt_func
     56 gf100_volt = {
     57 	.oneinit = gf100_volt_oneinit,
     58 	.vid_get = nvkm_voltgpio_get,
     59 	.vid_set = nvkm_voltgpio_set,
     60 	.speedo_read = gf100_volt_speedo_read,
     61 };
     62 
     63 int
     64 gf100_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt)
     65 {
     66 	struct nvkm_volt *volt;
     67 	int ret;
     68 
     69 	ret = nvkm_volt_new_(&gf100_volt, device, index, &volt);
     70 	*pvolt = volt;
     71 	if (ret)
     72 		return ret;
     73 
     74 	return nvkm_voltgpio_init(volt);
     75 }
     76