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      1 /*	$NetBSD: nouveau_nvkm_subdev_fuse_nv50.c,v 1.3 2021/12/18 23:45:39 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2014 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_fuse_nv50.c,v 1.3 2021/12/18 23:45:39 riastradh Exp $");
     28 
     29 #include "priv.h"
     30 
     31 static u32
     32 nv50_fuse_read(struct nvkm_fuse *fuse, u32 addr)
     33 {
     34 	struct nvkm_device *device = fuse->subdev.device;
     35 	unsigned long flags;
     36 	u32 fuse_enable, val;
     37 
     38 	/* racy if another part of nvkm start writing to this reg */
     39 	spin_lock_irqsave(&fuse->lock, flags);
     40 	fuse_enable = nvkm_mask(device, 0x001084, 0x800, 0x800);
     41 	val = nvkm_rd32(device, 0x021000 + addr);
     42 	nvkm_wr32(device, 0x001084, fuse_enable);
     43 	spin_unlock_irqrestore(&fuse->lock, flags);
     44 	return val;
     45 }
     46 
     47 static const struct nvkm_fuse_func
     48 nv50_fuse = {
     49 	.read = &nv50_fuse_read,
     50 };
     51 
     52 int
     53 nv50_fuse_new(struct nvkm_device *device, int index, struct nvkm_fuse **pfuse)
     54 {
     55 	return nvkm_fuse_new_(&nv50_fuse, device, index, pfuse);
     56 }
     57