1/* 2 * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 20 * DEALINGS IN THE SOFTWARE. 21 */ 22#include <subdev/ibus.h> 23#include <subdev/timer.h> 24 25struct gk20a_ibus_priv { 26 struct nvkm_ibus base; 27}; 28 29static void 30gk20a_ibus_init_priv_ring(struct gk20a_ibus_priv *priv) 31{ 32 nv_mask(priv, 0x137250, 0x3f, 0); 33 34 nv_mask(priv, 0x000200, 0x20, 0); 35 usleep_range(20, 30); 36 nv_mask(priv, 0x000200, 0x20, 0x20); 37 38 nv_wr32(priv, 0x12004c, 0x4); 39 nv_wr32(priv, 0x122204, 0x2); 40 nv_rd32(priv, 0x122204); 41} 42 43static void 44gk20a_ibus_intr(struct nvkm_subdev *subdev) 45{ 46 struct gk20a_ibus_priv *priv = (void *)subdev; 47 u32 status0 = nv_rd32(priv, 0x120058); 48 49 if (status0 & 0x7) { 50 nv_debug(priv, "resetting priv ring\n"); 51 gk20a_ibus_init_priv_ring(priv); 52 } 53 54 /* Acknowledge interrupt */ 55 nv_mask(priv, 0x12004c, 0x2, 0x2); 56 57 if (!nv_wait(subdev, 0x12004c, 0x3f, 0x00)) 58 nv_warn(priv, "timeout waiting for ringmaster ack\n"); 59} 60 61static int 62gk20a_ibus_init(struct nvkm_object *object) 63{ 64 struct gk20a_ibus_priv *priv = (void *)object; 65 int ret; 66 67 ret = _nvkm_ibus_init(object); 68 if (ret) 69 return ret; 70 71 gk20a_ibus_init_priv_ring(priv); 72 73 return 0; 74} 75 76static int 77gk20a_ibus_ctor(struct nvkm_object *parent, struct nvkm_object *engine, 78 struct nvkm_oclass *oclass, void *data, u32 size, 79 struct nvkm_object **pobject) 80{ 81 struct gk20a_ibus_priv *priv; 82 int ret; 83 84 ret = nvkm_ibus_create(parent, engine, oclass, &priv); 85 *pobject = nv_object(priv); 86 if (ret) 87 return ret; 88 89 nv_subdev(priv)->intr = gk20a_ibus_intr; 90 return 0; 91} 92 93struct nvkm_oclass 94gk20a_ibus_oclass = { 95 .handle = NV_SUBDEV(IBUS, 0xea), 96 .ofuncs = &(struct nvkm_ofuncs) { 97 .ctor = gk20a_ibus_ctor, 98 .dtor = _nvkm_ibus_dtor, 99 .init = gk20a_ibus_init, 100 .fini = _nvkm_ibus_fini, 101 }, 102}; 103