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      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 
     30 static void
     31 gk20a_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 
     53 static void
     54 gk20a_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 
     72 static int
     73 gk20a_ibus_init(struct nvkm_subdev *ibus)
     74 {
     75 	gk20a_ibus_init_ibus_ring(ibus);
     76 	return 0;
     77 }
     78 
     79 static const struct nvkm_subdev_func
     80 gk20a_ibus = {
     81 	.init = gk20a_ibus_init,
     82 	.intr = gk20a_ibus_intr,
     83 };
     84 
     85 int
     86 gk20a_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