drivers/gpu/drm/nouveau/nv50_evo.c - LeafOS-Devices/android_kernel_realme_mt6785 - Gitiles

 /*
  * Copyright 2010 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 "drmP.h"

 #include "nouveau_drv.h"
 #include "nouveau_dma.h"
 #include "nouveau_ramht.h"
 #include "nv50_display.h"

 static void
 nv50_evo_channel_del(struct nouveau_channel **pevo)
 {
 	struct nouveau_channel *evo = *pevo;

 	if (!evo)
 		return;
 	*pevo = NULL;

 	nouveau_gpuobj_channel_takedown(evo);
 	nouveau_bo_unmap(evo->pushbuf_bo);
 	nouveau_bo_ref(NULL, &evo->pushbuf_bo);

 	if (evo->user)
 		iounmap(evo->user);

 	kfree(evo);
 }

 void
 nv50_evo_dmaobj_init(struct nouveau_gpuobj *obj, u32 memtype, u64 base, u64 size)
 {
 	struct drm_nouveau_private *dev_priv = obj->dev->dev_private;
 	u32 flags5;

 	if (dev_priv->chipset < 0xc0) {
 		/* not supported on 0x50, specified in format mthd */
 		if (dev_priv->chipset == 0x50)
 			memtype = 0;
 		flags5 = 0x00010000;
 	} else {
 		if (memtype & 0x80000000)
 			flags5 = 0x00000000; /* large pages */
 		else
 			flags5 = 0x00020000;
 	}

 	nv50_gpuobj_dma_init(obj, 0, 0x3d, base, size, NV_MEM_TARGET_VRAM,
 			     NV_MEM_ACCESS_RW, (memtype >> 8) & 0xff, 0);
 	nv_wo32(obj, 0x14, flags5);
 	dev_priv->engine.instmem.flush(obj->dev);
 }

 int
 nv50_evo_dmaobj_new(struct nouveau_channel *evo, u32 handle, u32 memtype,
 		    u64 base, u64 size, struct nouveau_gpuobj **pobj)
 {
 	struct nv50_display *disp = nv50_display(evo->dev);
 	struct nouveau_gpuobj *obj = NULL;
 	int ret;

 	ret = nouveau_gpuobj_new(evo->dev, disp->master, 6*4, 32, 0, &obj);
 	if (ret)
 		return ret;
 	obj->engine = NVOBJ_ENGINE_DISPLAY;

 	nv50_evo_dmaobj_init(obj, memtype, base, size);

 	ret = nouveau_ramht_insert(evo, handle, obj);
 	if (ret)
 		goto out;

 	if (pobj)
 		nouveau_gpuobj_ref(obj, pobj);
 out:
 	nouveau_gpuobj_ref(NULL, &obj);
 	return ret;
 }

 static int
 nv50_evo_channel_new(struct drm_device *dev, int chid,
 		     struct nouveau_channel **pevo)
 {
 	struct nv50_display *disp = nv50_display(dev);
 	struct nouveau_channel *evo;
 	int ret;

 	evo = kzalloc(sizeof(struct nouveau_channel), GFP_KERNEL);
 	if (!evo)
 		return -ENOMEM;
 	*pevo = evo;

 	evo->id = chid;
 	evo->dev = dev;
 	evo->user_get = 4;
 	evo->user_put = 0;

 	ret = nouveau_bo_new(dev, NULL, 4096, 0, TTM_PL_FLAG_VRAM, 0, 0,
 			     false, true, &evo->pushbuf_bo);
 	if (ret == 0)
 		ret = nouveau_bo_pin(evo->pushbuf_bo, TTM_PL_FLAG_VRAM);
 	if (ret) {
 		NV_ERROR(dev, "Error creating EVO DMA push buffer: %d\n", ret);
 		nv50_evo_channel_del(pevo);
 		return ret;
 	}

 	ret = nouveau_bo_map(evo->pushbuf_bo);
 	if (ret) {
 		NV_ERROR(dev, "Error mapping EVO DMA push buffer: %d\n", ret);
 		nv50_evo_channel_del(pevo);
 		return ret;
 	}

 	evo->user = ioremap(pci_resource_start(dev->pdev, 0) +
 			    NV50_PDISPLAY_USER(evo->id), PAGE_SIZE);
 	if (!evo->user) {
 		NV_ERROR(dev, "Error mapping EVO control regs.\n");
 		nv50_evo_channel_del(pevo);
 		return -ENOMEM;
 	}

 	/* bind primary evo channel's ramht to the channel */
 	if (disp->master && evo != disp->master)
 		nouveau_ramht_ref(disp->master->ramht, &evo->ramht, NULL);

 	return 0;
 }

 static int
 nv50_evo_channel_init(struct nouveau_channel *evo)
 {
 	struct drm_device *dev = evo->dev;
 	int id = evo->id, ret, i;
 	u64 pushbuf = evo->pushbuf_bo->bo.mem.start << PAGE_SHIFT;
 	u32 tmp;

 	tmp = nv_rd32(dev, NV50_PDISPLAY_EVO_CTRL(id));
 	if ((tmp & 0x009f0000) == 0x00020000)
 		nv_wr32(dev, NV50_PDISPLAY_EVO_CTRL(id), tmp | 0x00800000);

 	tmp = nv_rd32(dev, NV50_PDISPLAY_EVO_CTRL(id));
 	if ((tmp & 0x003f0000) == 0x00030000)
 		nv_wr32(dev, NV50_PDISPLAY_EVO_CTRL(id), tmp | 0x00600000);

 	/* initialise fifo */
 	nv_wr32(dev, NV50_PDISPLAY_EVO_DMA_CB(id), pushbuf >> 8 |
 		     NV50_PDISPLAY_EVO_DMA_CB_LOCATION_VRAM |
 		     NV50_PDISPLAY_EVO_DMA_CB_VALID);
 	nv_wr32(dev, NV50_PDISPLAY_EVO_UNK2(id), 0x00010000);
 	nv_wr32(dev, NV50_PDISPLAY_EVO_HASH_TAG(id), id);
 	nv_mask(dev, NV50_PDISPLAY_EVO_CTRL(id), NV50_PDISPLAY_EVO_CTRL_DMA,
 		     NV50_PDISPLAY_EVO_CTRL_DMA_ENABLED);

 	nv_wr32(dev, NV50_PDISPLAY_USER_PUT(id), 0x00000000);
 	nv_wr32(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x01000003 |
 		     NV50_PDISPLAY_EVO_CTRL_DMA_ENABLED);
 	if (!nv_wait(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x80000000, 0x00000000)) {
 		NV_ERROR(dev, "EvoCh %d init timeout: 0x%08x\n", id,
 			 nv_rd32(dev, NV50_PDISPLAY_EVO_CTRL(id)));
 		return -EBUSY;
 	}

 	/* enable error reporting on the channel */
 	nv_mask(dev, 0x610028, 0x00000000, 0x00010001 << id);

 	evo->dma.max = (4096/4) - 2;
 	evo->dma.put = 0;
 	evo->dma.cur = evo->dma.put;
 	evo->dma.free = evo->dma.max - evo->dma.cur;

 	ret = RING_SPACE(evo, NOUVEAU_DMA_SKIPS);
 	if (ret)
 		return ret;

 	for (i = 0; i < NOUVEAU_DMA_SKIPS; i++)
 		OUT_RING(evo, 0);

 	return 0;
 }

 static void
 nv50_evo_channel_fini(struct nouveau_channel *evo)
 {
 	struct drm_device *dev = evo->dev;
 	int id = evo->id;

 	nv_mask(dev, 0x610028, 0x00010001 << id, 0x00000000);
 	nv_mask(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x00001010, 0x00001000);
 	nv_wr32(dev, NV50_PDISPLAY_INTR_0, (1 << id));
 	nv_mask(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x00000003, 0x00000000);
 	if (!nv_wait(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x001e0000, 0x00000000)) {
 		NV_ERROR(dev, "EvoCh %d takedown timeout: 0x%08x\n", id,
 			 nv_rd32(dev, NV50_PDISPLAY_EVO_CTRL(id)));
 	}
 }

 static void
 nv50_evo_destroy(struct drm_device *dev)
 {
 	struct nv50_display *disp = nv50_display(dev);
 	int i;

 	for (i = 0; i < 2; i++) {
 		if (disp->crtc[i].sem.bo) {
 			nouveau_bo_unmap(disp->crtc[i].sem.bo);
 			nouveau_bo_ref(NULL, &disp->crtc[i].sem.bo);
 		}
 		nv50_evo_channel_del(&disp->crtc[i].sync);
 	}
 	nouveau_gpuobj_ref(NULL, &disp->ntfy);
 	nv50_evo_channel_del(&disp->master);
 }

 static int
 nv50_evo_create(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nv50_display *disp = nv50_display(dev);
 	struct nouveau_gpuobj *ramht = NULL;
 	struct nouveau_channel *evo;
 	int ret, i, j;

 	/* create primary evo channel, the one we use for modesetting
 	 * purporses
 	 */
 	ret = nv50_evo_channel_new(dev, 0, &disp->master);
 	if (ret)
 		return ret;
 	evo = disp->master;

 	/* setup object management on it, any other evo channel will
 	 * use this also as there's no per-channel support on the
 	 * hardware
 	 */
 	ret = nouveau_gpuobj_new(dev, NULL, 32768, 65536,
 				 NVOBJ_FLAG_ZERO_ALLOC, &evo->ramin);
 	if (ret) {
 		NV_ERROR(dev, "Error allocating EVO channel memory: %d\n", ret);
 		goto err;
 	}

 	ret = drm_mm_init(&evo->ramin_heap, 0, 32768);
 	if (ret) {
 		NV_ERROR(dev, "Error initialising EVO PRAMIN heap: %d\n", ret);
 		goto err;
 	}

 	ret = nouveau_gpuobj_new(dev, evo, 4096, 16, 0, &ramht);
 	if (ret) {
 		NV_ERROR(dev, "Unable to allocate EVO RAMHT: %d\n", ret);
 		goto err;
 	}

 	ret = nouveau_ramht_new(dev, ramht, &evo->ramht);
 	nouveau_gpuobj_ref(NULL, &ramht);
 	if (ret)
 		goto err;

 	/* not sure exactly what this is..
 	 *
 	 * the first dword of the structure is used by nvidia to wait on
 	 * full completion of an EVO "update" command.
 	 *
 	 * method 0x8c on the master evo channel will fill a lot more of
 	 * this structure with some undefined info
 	 */
 	ret = nouveau_gpuobj_new(dev, disp->master, 0x1000, 0,
 				 NVOBJ_FLAG_ZERO_ALLOC, &disp->ntfy);
 	if (ret)
 		goto err;

 	ret = nv50_evo_dmaobj_new(disp->master, NvEvoSync, 0x0000,
 				  disp->ntfy->vinst, disp->ntfy->size, NULL);
 	if (ret)
 		goto err;

 	/* create some default objects for the scanout memtypes we support */
 	ret = nv50_evo_dmaobj_new(disp->master, NvEvoVRAM, 0x0000,
 				  0, dev_priv->vram_size, NULL);
 	if (ret)
 		goto err;

 	ret = nv50_evo_dmaobj_new(disp->master, NvEvoVRAM_LP, 0x80000000,
 				  0, dev_priv->vram_size, NULL);
 	if (ret)
 		goto err;

 	ret = nv50_evo_dmaobj_new(disp->master, NvEvoFB32, 0x80000000 |
 				  (dev_priv->chipset < 0xc0 ? 0x7a00 : 0xfe00),
 				  0, dev_priv->vram_size, NULL);
 	if (ret)
 		goto err;

 	ret = nv50_evo_dmaobj_new(disp->master, NvEvoFB16, 0x80000000 |
 				  (dev_priv->chipset < 0xc0 ? 0x7000 : 0xfe00),
 				  0, dev_priv->vram_size, NULL);
 	if (ret)
 		goto err;

 	/* create "display sync" channels and other structures we need
 	 * to implement page flipping
 	 */
 	for (i = 0; i < 2; i++) {
 		struct nv50_display_crtc *dispc = &disp->crtc[i];
 		u64 offset;

 		ret = nv50_evo_channel_new(dev, 1 + i, &dispc->sync);
 		if (ret)
 			goto err;

 		ret = nouveau_bo_new(dev, NULL, 4096, 0x1000, TTM_PL_FLAG_VRAM,
 				     0, 0x0000, false, true, &dispc->sem.bo);
 		if (!ret) {
 			offset = dispc->sem.bo->bo.mem.start << PAGE_SHIFT;

 			ret = nouveau_bo_pin(dispc->sem.bo, TTM_PL_FLAG_VRAM);
 			if (!ret)
 				ret = nouveau_bo_map(dispc->sem.bo);
 			if (ret)
 				nouveau_bo_ref(NULL, &dispc->sem.bo);
 		}

 		if (ret)
 			goto err;

 		ret = nv50_evo_dmaobj_new(dispc->sync, NvEvoSync, 0x0000,
 					  offset, 4096, NULL);
 		if (ret)
 			goto err;

 		ret = nv50_evo_dmaobj_new(dispc->sync, NvEvoVRAM_LP, 0x80000000,
 					  0, dev_priv->vram_size, NULL);
 		if (ret)
 			goto err;

 		ret = nv50_evo_dmaobj_new(dispc->sync, NvEvoFB32, 0x80000000 |
 					  (dev_priv->chipset < 0xc0 ?
 					  0x7a00 : 0xfe00),
 					  0, dev_priv->vram_size, NULL);
 		if (ret)
 			goto err;

 		ret = nv50_evo_dmaobj_new(dispc->sync, NvEvoFB16, 0x80000000 |
 					  (dev_priv->chipset < 0xc0 ?
 					  0x7000 : 0xfe00),
 					  0, dev_priv->vram_size, NULL);
 		if (ret)
 			goto err;

 		for (j = 0; j < 4096; j += 4)
 			nouveau_bo_wr32(dispc->sem.bo, j / 4, 0x74b1e000);
 		dispc->sem.offset = 0;
 	}

 	return 0;

 err:
 	nv50_evo_destroy(dev);
 	return ret;
 }

 int
 nv50_evo_init(struct drm_device *dev)
 {
 	struct nv50_display *disp = nv50_display(dev);
 	int ret, i;

 	if (!disp->master) {
 		ret = nv50_evo_create(dev);
 		if (ret)
 			return ret;
 	}

 	ret = nv50_evo_channel_init(disp->master);
 	if (ret)
 		return ret;

 	for (i = 0; i < 2; i++) {
 		ret = nv50_evo_channel_init(disp->crtc[i].sync);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 void
 nv50_evo_fini(struct drm_device *dev)
 {
 	struct nv50_display *disp = nv50_display(dev);
 	int i;

 	for (i = 0; i < 2; i++) {
 		if (disp->crtc[i].sync)
 			nv50_evo_channel_fini(disp->crtc[i].sync);
 	}

 	if (disp->master)
 		nv50_evo_channel_fini(disp->master);

 	nv50_evo_destroy(dev);
 }
	/*
	* Copyright 2010 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 "drmP.h"

	#include "nouveau_drv.h"
	#include "nouveau_dma.h"
	#include "nouveau_ramht.h"
	#include "nv50_display.h"

	static void
	nv50_evo_channel_del(struct nouveau_channel **pevo)
	{
	struct nouveau_channel evo = pevo;

	if (!evo)
	return;
	*pevo = NULL;

	nouveau_gpuobj_channel_takedown(evo);
	nouveau_bo_unmap(evo->pushbuf_bo);
	nouveau_bo_ref(NULL, &evo->pushbuf_bo);

	if (evo->user)
	iounmap(evo->user);

	kfree(evo);
	}

	void
	nv50_evo_dmaobj_init(struct nouveau_gpuobj *obj, u32 memtype, u64 base, u64 size)
	{
	struct drm_nouveau_private *dev_priv = obj->dev->dev_private;
	u32 flags5;

	if (dev_priv->chipset < 0xc0) {
	/* not supported on 0x50, specified in format mthd */
	if (dev_priv->chipset == 0x50)
	memtype = 0;
	flags5 = 0x00010000;
	} else {
	if (memtype & 0x80000000)
	flags5 = 0x00000000; /* large pages */
	else
	flags5 = 0x00020000;
	}

	nv50_gpuobj_dma_init(obj, 0, 0x3d, base, size, NV_MEM_TARGET_VRAM,
	NV_MEM_ACCESS_RW, (memtype >> 8) & 0xff, 0);
	nv_wo32(obj, 0x14, flags5);
	dev_priv->engine.instmem.flush(obj->dev);
	}

	int
	nv50_evo_dmaobj_new(struct nouveau_channel *evo, u32 handle, u32 memtype,
	u64 base, u64 size, struct nouveau_gpuobj **pobj)
	{
	struct nv50_display *disp = nv50_display(evo->dev);
	struct nouveau_gpuobj *obj = NULL;
	int ret;

	ret = nouveau_gpuobj_new(evo->dev, disp->master, 6*4, 32, 0, &obj);
	if (ret)
	return ret;
	obj->engine = NVOBJ_ENGINE_DISPLAY;

	nv50_evo_dmaobj_init(obj, memtype, base, size);

	ret = nouveau_ramht_insert(evo, handle, obj);
	if (ret)
	goto out;

	if (pobj)
	nouveau_gpuobj_ref(obj, pobj);
	out:
	nouveau_gpuobj_ref(NULL, &obj);
	return ret;
	}

	static int
	nv50_evo_channel_new(struct drm_device *dev, int chid,
	struct nouveau_channel **pevo)
	{
	struct nv50_display *disp = nv50_display(dev);
	struct nouveau_channel *evo;
	int ret;

	evo = kzalloc(sizeof(struct nouveau_channel), GFP_KERNEL);
	if (!evo)
	return -ENOMEM;
	*pevo = evo;

	evo->id = chid;
	evo->dev = dev;
	evo->user_get = 4;
	evo->user_put = 0;

	ret = nouveau_bo_new(dev, NULL, 4096, 0, TTM_PL_FLAG_VRAM, 0, 0,
	false, true, &evo->pushbuf_bo);
	if (ret == 0)
	ret = nouveau_bo_pin(evo->pushbuf_bo, TTM_PL_FLAG_VRAM);
	if (ret) {
	NV_ERROR(dev, "Error creating EVO DMA push buffer: %d\n", ret);
	nv50_evo_channel_del(pevo);
	return ret;
	}

	ret = nouveau_bo_map(evo->pushbuf_bo);
	if (ret) {
	NV_ERROR(dev, "Error mapping EVO DMA push buffer: %d\n", ret);
	nv50_evo_channel_del(pevo);
	return ret;
	}

	evo->user = ioremap(pci_resource_start(dev->pdev, 0) +
	NV50_PDISPLAY_USER(evo->id), PAGE_SIZE);
	if (!evo->user) {
	NV_ERROR(dev, "Error mapping EVO control regs.\n");
	nv50_evo_channel_del(pevo);
	return -ENOMEM;
	}

	/* bind primary evo channel's ramht to the channel */
	if (disp->master && evo != disp->master)
	nouveau_ramht_ref(disp->master->ramht, &evo->ramht, NULL);

	return 0;
	}

	static int
	nv50_evo_channel_init(struct nouveau_channel *evo)
	{
	struct drm_device *dev = evo->dev;
	int id = evo->id, ret, i;
	u64 pushbuf = evo->pushbuf_bo->bo.mem.start << PAGE_SHIFT;
	u32 tmp;

	tmp = nv_rd32(dev, NV50_PDISPLAY_EVO_CTRL(id));
	if ((tmp & 0x009f0000) == 0x00020000)
	nv_wr32(dev, NV50_PDISPLAY_EVO_CTRL(id), tmp \| 0x00800000);

	tmp = nv_rd32(dev, NV50_PDISPLAY_EVO_CTRL(id));
	if ((tmp & 0x003f0000) == 0x00030000)
	nv_wr32(dev, NV50_PDISPLAY_EVO_CTRL(id), tmp \| 0x00600000);

	/* initialise fifo */
	nv_wr32(dev, NV50_PDISPLAY_EVO_DMA_CB(id), pushbuf >> 8 \|
	NV50_PDISPLAY_EVO_DMA_CB_LOCATION_VRAM \|
	NV50_PDISPLAY_EVO_DMA_CB_VALID);
	nv_wr32(dev, NV50_PDISPLAY_EVO_UNK2(id), 0x00010000);
	nv_wr32(dev, NV50_PDISPLAY_EVO_HASH_TAG(id), id);
	nv_mask(dev, NV50_PDISPLAY_EVO_CTRL(id), NV50_PDISPLAY_EVO_CTRL_DMA,
	NV50_PDISPLAY_EVO_CTRL_DMA_ENABLED);

	nv_wr32(dev, NV50_PDISPLAY_USER_PUT(id), 0x00000000);
	nv_wr32(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x01000003 \|
	NV50_PDISPLAY_EVO_CTRL_DMA_ENABLED);
	if (!nv_wait(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x80000000, 0x00000000)) {
	NV_ERROR(dev, "EvoCh %d init timeout: 0x%08x\n", id,
	nv_rd32(dev, NV50_PDISPLAY_EVO_CTRL(id)));
	return -EBUSY;
	}

	/* enable error reporting on the channel */
	nv_mask(dev, 0x610028, 0x00000000, 0x00010001 << id);

	evo->dma.max = (4096/4) - 2;
	evo->dma.put = 0;
	evo->dma.cur = evo->dma.put;
	evo->dma.free = evo->dma.max - evo->dma.cur;

	ret = RING_SPACE(evo, NOUVEAU_DMA_SKIPS);
	if (ret)
	return ret;

	for (i = 0; i < NOUVEAU_DMA_SKIPS; i++)
	OUT_RING(evo, 0);

	return 0;
	}

	static void
	nv50_evo_channel_fini(struct nouveau_channel *evo)
	{
	struct drm_device *dev = evo->dev;
	int id = evo->id;

	nv_mask(dev, 0x610028, 0x00010001 << id, 0x00000000);
	nv_mask(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x00001010, 0x00001000);
	nv_wr32(dev, NV50_PDISPLAY_INTR_0, (1 << id));
	nv_mask(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x00000003, 0x00000000);
	if (!nv_wait(dev, NV50_PDISPLAY_EVO_CTRL(id), 0x001e0000, 0x00000000)) {
	NV_ERROR(dev, "EvoCh %d takedown timeout: 0x%08x\n", id,
	nv_rd32(dev, NV50_PDISPLAY_EVO_CTRL(id)));
	}
	}

	static void
	nv50_evo_destroy(struct drm_device *dev)
	{
	struct nv50_display *disp = nv50_display(dev);
	int i;

	for (i = 0; i < 2; i++) {
	if (disp->crtc[i].sem.bo) {
	nouveau_bo_unmap(disp->crtc[i].sem.bo);
	nouveau_bo_ref(NULL, &disp->crtc[i].sem.bo);
	}
	nv50_evo_channel_del(&disp->crtc[i].sync);
	}
	nouveau_gpuobj_ref(NULL, &disp->ntfy);
	nv50_evo_channel_del(&disp->master);
	}

	static int
	nv50_evo_create(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nv50_display *disp = nv50_display(dev);
	struct nouveau_gpuobj *ramht = NULL;
	struct nouveau_channel *evo;
	int ret, i, j;

	/* create primary evo channel, the one we use for modesetting
	* purporses
	*/
	ret = nv50_evo_channel_new(dev, 0, &disp->master);
	if (ret)
	return ret;
	evo = disp->master;

	/* setup object management on it, any other evo channel will
	* use this also as there's no per-channel support on the
	* hardware
	*/
	ret = nouveau_gpuobj_new(dev, NULL, 32768, 65536,
	NVOBJ_FLAG_ZERO_ALLOC, &evo->ramin);
	if (ret) {
	NV_ERROR(dev, "Error allocating EVO channel memory: %d\n", ret);
	goto err;
	}

	ret = drm_mm_init(&evo->ramin_heap, 0, 32768);
	if (ret) {
	NV_ERROR(dev, "Error initialising EVO PRAMIN heap: %d\n", ret);
	goto err;
	}

	ret = nouveau_gpuobj_new(dev, evo, 4096, 16, 0, &ramht);
	if (ret) {
	NV_ERROR(dev, "Unable to allocate EVO RAMHT: %d\n", ret);
	goto err;
	}

	ret = nouveau_ramht_new(dev, ramht, &evo->ramht);
	nouveau_gpuobj_ref(NULL, &ramht);
	if (ret)
	goto err;

	/* not sure exactly what this is..
	*
	* the first dword of the structure is used by nvidia to wait on
	* full completion of an EVO "update" command.
	*
	* method 0x8c on the master evo channel will fill a lot more of
	* this structure with some undefined info
	*/
	ret = nouveau_gpuobj_new(dev, disp->master, 0x1000, 0,
	NVOBJ_FLAG_ZERO_ALLOC, &disp->ntfy);
	if (ret)
	goto err;

	ret = nv50_evo_dmaobj_new(disp->master, NvEvoSync, 0x0000,
	disp->ntfy->vinst, disp->ntfy->size, NULL);
	if (ret)
	goto err;

	/* create some default objects for the scanout memtypes we support */
	ret = nv50_evo_dmaobj_new(disp->master, NvEvoVRAM, 0x0000,
	0, dev_priv->vram_size, NULL);
	if (ret)
	goto err;

	ret = nv50_evo_dmaobj_new(disp->master, NvEvoVRAM_LP, 0x80000000,
	0, dev_priv->vram_size, NULL);
	if (ret)
	goto err;

	ret = nv50_evo_dmaobj_new(disp->master, NvEvoFB32, 0x80000000 \|
	(dev_priv->chipset < 0xc0 ? 0x7a00 : 0xfe00),
	0, dev_priv->vram_size, NULL);
	if (ret)
	goto err;

	ret = nv50_evo_dmaobj_new(disp->master, NvEvoFB16, 0x80000000 \|
	(dev_priv->chipset < 0xc0 ? 0x7000 : 0xfe00),
	0, dev_priv->vram_size, NULL);
	if (ret)
	goto err;

	/* create "display sync" channels and other structures we need
	* to implement page flipping
	*/
	for (i = 0; i < 2; i++) {
	struct nv50_display_crtc *dispc = &disp->crtc[i];
	u64 offset;

	ret = nv50_evo_channel_new(dev, 1 + i, &dispc->sync);
	if (ret)
	goto err;

	ret = nouveau_bo_new(dev, NULL, 4096, 0x1000, TTM_PL_FLAG_VRAM,
	0, 0x0000, false, true, &dispc->sem.bo);
	if (!ret) {
	offset = dispc->sem.bo->bo.mem.start << PAGE_SHIFT;

	ret = nouveau_bo_pin(dispc->sem.bo, TTM_PL_FLAG_VRAM);
	if (!ret)
	ret = nouveau_bo_map(dispc->sem.bo);
	if (ret)
	nouveau_bo_ref(NULL, &dispc->sem.bo);
	}

	if (ret)
	goto err;

	ret = nv50_evo_dmaobj_new(dispc->sync, NvEvoSync, 0x0000,
	offset, 4096, NULL);
	if (ret)
	goto err;

	ret = nv50_evo_dmaobj_new(dispc->sync, NvEvoVRAM_LP, 0x80000000,
	0, dev_priv->vram_size, NULL);
	if (ret)
	goto err;

	ret = nv50_evo_dmaobj_new(dispc->sync, NvEvoFB32, 0x80000000 \|
	(dev_priv->chipset < 0xc0 ?
	0x7a00 : 0xfe00),
	0, dev_priv->vram_size, NULL);
	if (ret)
	goto err;

	ret = nv50_evo_dmaobj_new(dispc->sync, NvEvoFB16, 0x80000000 \|
	(dev_priv->chipset < 0xc0 ?
	0x7000 : 0xfe00),
	0, dev_priv->vram_size, NULL);
	if (ret)
	goto err;

	for (j = 0; j < 4096; j += 4)
	nouveau_bo_wr32(dispc->sem.bo, j / 4, 0x74b1e000);
	dispc->sem.offset = 0;
	}

	return 0;

	err:
	nv50_evo_destroy(dev);
	return ret;
	}

	int
	nv50_evo_init(struct drm_device *dev)
	{
	struct nv50_display *disp = nv50_display(dev);
	int ret, i;

	if (!disp->master) {
	ret = nv50_evo_create(dev);
	if (ret)
	return ret;
	}

	ret = nv50_evo_channel_init(disp->master);
	if (ret)
	return ret;

	for (i = 0; i < 2; i++) {
	ret = nv50_evo_channel_init(disp->crtc[i].sync);
	if (ret)
	return ret;
	}

	return 0;
	}

	void
	nv50_evo_fini(struct drm_device *dev)
	{
	struct nv50_display *disp = nv50_display(dev);
	int i;

	for (i = 0; i < 2; i++) {
	if (disp->crtc[i].sync)
	nv50_evo_channel_fini(disp->crtc[i].sync);
	}

	if (disp->master)
	nv50_evo_channel_fini(disp->master);

	nv50_evo_destroy(dev);
	}