1/* $NetBSD: nouveau_nvkm_subdev_ibus_gk20a.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $ */ 2 3/* 4 * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved. 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 */ 24#include <sys/cdefs.h> 25__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_ibus_gk20a.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $"); 26 27#include <subdev/ibus.h> 28#include <subdev/timer.h> 29 30static void 31gk20a_ibus_init_ibus_ring(struct nvkm_subdev *ibus) 32{ 33 struct nvkm_device *device = ibus->device; 34 nvkm_mask(device, 0x137250, 0x3f, 0); 35 36 nvkm_mask(device, 0x000200, 0x20, 0); 37 udelay(20); 38 nvkm_mask(device, 0x000200, 0x20, 0x20); 39 40 nvkm_wr32(device, 0x12004c, 0x4); 41 nvkm_wr32(device, 0x122204, 0x2); 42 nvkm_rd32(device, 0x122204); 43 44 /* 45 * Bug: increase clock timeout to avoid operation failure at high 46 * gpcclk rate. 47 */ 48 nvkm_wr32(device, 0x122354, 0x800); 49 nvkm_wr32(device, 0x128328, 0x800); 50 nvkm_wr32(device, 0x124320, 0x800); 51} 52 53static void 54gk20a_ibus_intr(struct nvkm_subdev *ibus) 55{ 56 struct nvkm_device *device = ibus->device; 57 u32 status0 = nvkm_rd32(device, 0x120058); 58 59 if (status0 & 0x7) { 60 nvkm_debug(ibus, "resetting ibus ring\n"); 61 gk20a_ibus_init_ibus_ring(ibus); 62 } 63 64 /* Acknowledge interrupt */ 65 nvkm_mask(device, 0x12004c, 0x2, 0x2); 66 nvkm_msec(device, 2000, 67 if (!(nvkm_rd32(device, 0x12004c) & 0x0000003f)) 68 break; 69 ); 70} 71 72static int 73gk20a_ibus_init(struct nvkm_subdev *ibus) 74{ 75 gk20a_ibus_init_ibus_ring(ibus); 76 return 0; 77} 78 79static const struct nvkm_subdev_func 80gk20a_ibus = { 81 .init = gk20a_ibus_init, 82 .intr = gk20a_ibus_intr, 83}; 84 85int 86gk20a_ibus_new(struct nvkm_device *device, int index, 87 struct nvkm_subdev **pibus) 88{ 89 struct nvkm_subdev *ibus; 90 if (!(ibus = *pibus = kzalloc(sizeof(*ibus), GFP_KERNEL))) 91 return -ENOMEM; 92 nvkm_subdev_ctor(&gk20a_ibus, device, index, ibus); 93 return 0; 94} 95