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      1 /*	$NetBSD: nouveau_nvkm_engine_dma_base.c,v 1.5 2021/12/18 23:45:35 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2012 Red Hat Inc.
      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: Ben Skeggs
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_engine_dma_base.c,v 1.5 2021/12/18 23:45:35 riastradh Exp $");
     28 
     29 #include "priv.h"
     30 
     31 #include <core/client.h>
     32 #include <engine/fifo.h>
     33 
     34 #include <nvif/class.h>
     35 
     36 static int
     37 nvkm_dma_oclass_new(struct nvkm_device *device,
     38 		    const struct nvkm_oclass *oclass, void *data, u32 size,
     39 		    struct nvkm_object **pobject)
     40 {
     41 	struct nvkm_dma *dma = nvkm_dma(oclass->engine);
     42 	struct nvkm_dmaobj *dmaobj = NULL;
     43 	int ret;
     44 
     45 	ret = dma->func->class_new(dma, oclass, data, size, &dmaobj);
     46 	if (dmaobj)
     47 		*pobject = &dmaobj->object;
     48 	return ret;
     49 }
     50 
     51 static const struct nvkm_device_oclass
     52 nvkm_dma_oclass_base = {
     53 	.ctor = nvkm_dma_oclass_new,
     54 };
     55 
     56 static int
     57 nvkm_dma_oclass_fifo_new(const struct nvkm_oclass *oclass, void *data, u32 size,
     58 			 struct nvkm_object **pobject)
     59 {
     60 	return nvkm_dma_oclass_new(oclass->engine->subdev.device,
     61 				   oclass, data, size, pobject);
     62 }
     63 
     64 static const struct nvkm_sclass
     65 nvkm_dma_sclass[] = {
     66 	{ 0, 0, NV_DMA_FROM_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
     67 	{ 0, 0, NV_DMA_TO_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
     68 	{ 0, 0, NV_DMA_IN_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
     69 };
     70 
     71 static int
     72 nvkm_dma_oclass_base_get(struct nvkm_oclass *sclass, int index,
     73 			 const struct nvkm_device_oclass **class)
     74 {
     75 	const int count = ARRAY_SIZE(nvkm_dma_sclass);
     76 	if (index < count) {
     77 		const struct nvkm_sclass *oclass = &nvkm_dma_sclass[index];
     78 		sclass->base = oclass[0];
     79 		sclass->engn = oclass;
     80 		*class = &nvkm_dma_oclass_base;
     81 		return index;
     82 	}
     83 	return count;
     84 }
     85 
     86 static int
     87 nvkm_dma_oclass_fifo_get(struct nvkm_oclass *oclass, int index)
     88 {
     89 	const int count = ARRAY_SIZE(nvkm_dma_sclass);
     90 	if (index < count) {
     91 		oclass->base = nvkm_dma_sclass[index];
     92 		return index;
     93 	}
     94 	return count;
     95 }
     96 
     97 static void *
     98 nvkm_dma_dtor(struct nvkm_engine *engine)
     99 {
    100 	return nvkm_dma(engine);
    101 }
    102 
    103 static const struct nvkm_engine_func
    104 nvkm_dma = {
    105 	.dtor = nvkm_dma_dtor,
    106 	.base.sclass = nvkm_dma_oclass_base_get,
    107 	.fifo.sclass = nvkm_dma_oclass_fifo_get,
    108 };
    109 
    110 int
    111 nvkm_dma_new_(const struct nvkm_dma_func *func, struct nvkm_device *device,
    112 	      int index, struct nvkm_dma **pdma)
    113 {
    114 	struct nvkm_dma *dma;
    115 
    116 	if (!(dma = *pdma = kzalloc(sizeof(*dma), GFP_KERNEL)))
    117 		return -ENOMEM;
    118 	dma->func = func;
    119 
    120 	return nvkm_engine_ctor(&nvkm_dma, device, index, true, &dma->engine);
    121 }
    122