linux_kernel/drivers/gpu/drm/nouveau/nvkm/engine/mpeg/nv40.c

/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */
#include "nv31.h"

#include <subdev/instmem.h>

#include <nvif/class.h>

bool
nv40_mpeg_mthd_dma(struct nvkm_device *device, u32 mthd, u32 data)
{
	struct nvkm_instmem *imem = device->imem;
	u32 inst = data << 4;
	u32 dma0 = nvkm_instmem_rd32(imem, inst + 0);
	u32 dma1 = nvkm_instmem_rd32(imem, inst + 4);
	u32 dma2 = nvkm_instmem_rd32(imem, inst + 8);
	u32 base = (dma2 & 0xfffff000) | (dma0 >> 20);
	u32 size = dma1 + 1;

	/* only allow linear DMA objects */
	if (!(dma0 & 0x00002000))
		return false;

	if (mthd == 0x0190) {
		/* DMA_CMD */
		nvkm_mask(device, 0x00b300, 0x00030000, (dma0 & 0x00030000));
		nvkm_wr32(device, 0x00b334, base);
		nvkm_wr32(device, 0x00b324, size);
	} else
	if (mthd == 0x01a0) {
		/* DMA_DATA */
		nvkm_mask(device, 0x00b300, 0x000c0000, (dma0 & 0x00030000) << 2);
		nvkm_wr32(device, 0x00b360, base);
		nvkm_wr32(device, 0x00b364, size);
	} else {
		/* DMA_IMAGE, VRAM only */
		if (dma0 & 0x00030000)
			return false;

		nvkm_wr32(device, 0x00b370, base);
		nvkm_wr32(device, 0x00b374, size);
	}

	return true;
}

static const struct nv31_mpeg_func
nv40_mpeg = {
	.mthd_dma = nv40_mpeg_mthd_dma,
};

int
nv40_mpeg_new(struct nvkm_device *device, int index, struct nvkm_engine **pmpeg)
{
	return nv31_mpeg_new_(&nv40_mpeg, device, index, pmpeg);
}