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 31static u32 32nv50_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 47static const struct nvkm_fuse_func 48nv50_fuse = { 49 .read = &nv50_fuse_read, 50}; 51 52int 53nv50_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