LXR linux/drivers/gpu/drm/nouveau/nvkm/engine/dma/base.c

   1/*
   2 * Copyright 2012 Red Hat Inc.
   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 COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Ben Skeggs
  23 */
  24#include "priv.h"
  25
  26#include <core/client.h>
  27#include <engine/fifo.h>
  28
  29#include <nvif/class.h>
  30
  31static int
  32nvkm_dma_oclass_new(struct nvkm_device *device,
  33                    const struct nvkm_oclass *oclass, void *data, u32 size,
  34                    struct nvkm_object **pobject)
  35{
  36        struct nvkm_dma *dma = nvkm_dma(oclass->engine);
  37        struct nvkm_dmaobj *dmaobj = NULL;
  38        int ret;
  39
  40        ret = dma->func->class_new(dma, oclass, data, size, &dmaobj);
  41        if (dmaobj)
  42                *pobject = &dmaobj->object;
  43        return ret;
  44}
  45
  46static const struct nvkm_device_oclass
  47nvkm_dma_oclass_base = {
  48        .ctor = nvkm_dma_oclass_new,
  49};
  50
  51static int
  52nvkm_dma_oclass_fifo_new(const struct nvkm_oclass *oclass, void *data, u32 size,
  53                         struct nvkm_object **pobject)
  54{
  55        return nvkm_dma_oclass_new(oclass->engine->subdev.device,
  56                                   oclass, data, size, pobject);
  57}
  58
  59static const struct nvkm_sclass
  60nvkm_dma_sclass[] = {
  61        { 0, 0, NV_DMA_FROM_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
  62        { 0, 0, NV_DMA_TO_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
  63        { 0, 0, NV_DMA_IN_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
  64};
  65
  66static int
  67nvkm_dma_oclass_base_get(struct nvkm_oclass *sclass, int index,
  68                         const struct nvkm_device_oclass **class)
  69{
  70        const int count = ARRAY_SIZE(nvkm_dma_sclass);
  71        if (index < count) {
  72                const struct nvkm_sclass *oclass = &nvkm_dma_sclass[index];
  73                sclass->base = oclass[0];
  74                sclass->engn = oclass;
  75                *class = &nvkm_dma_oclass_base;
  76                return index;
  77        }
  78        return count;
  79}
  80
  81static int
  82nvkm_dma_oclass_fifo_get(struct nvkm_oclass *oclass, int index)
  83{
  84        const int count = ARRAY_SIZE(nvkm_dma_sclass);
  85        if (index < count) {
  86                oclass->base = nvkm_dma_sclass[index];
  87                return index;
  88        }
  89        return count;
  90}
  91
  92static void *
  93nvkm_dma_dtor(struct nvkm_engine *engine)
  94{
  95        return nvkm_dma(engine);
  96}
  97
  98static const struct nvkm_engine_func
  99nvkm_dma = {
 100        .dtor = nvkm_dma_dtor,
 101        .base.sclass = nvkm_dma_oclass_base_get,
 102        .fifo.sclass = nvkm_dma_oclass_fifo_get,
 103};
 104
 105int
 106nvkm_dma_new_(const struct nvkm_dma_func *func, struct nvkm_device *device,
 107              enum nvkm_subdev_type type, int inst, struct nvkm_dma **pdma)
 108{
 109        struct nvkm_dma *dma;
 110
 111        if (!(dma = *pdma = kzalloc(sizeof(*dma), GFP_KERNEL)))
 112                return -ENOMEM;
 113        dma->func = func;
 114
 115        return nvkm_engine_ctor(&nvkm_dma, device, type, inst, true, &dma->engine);
 116}
 117